/* Standardized AI solution cards */
.solution-card {
  margin: 4px 0 8px;
  padding: 18px;
  border: 1px solid rgba(99, 102, 241, .18);
  border-radius: 16px;
  background: var(--bg-card, #fff);
  color: var(--text-primary, #172033);
  box-shadow: 0 8px 24px rgba(30, 41, 59, .08);
}
.solution-bubble { max-width: min(780px, 94%); }
.solution-card-head { display:flex; align-items:flex-start; justify-content:space-between; gap:12px; margin-bottom:12px; }
.solution-card-head h3 { margin:2px 0 0; font-size:19px; }
.solution-eyebrow { color:#6366f1; font-size:10px; letter-spacing:.12em; font-weight:700; }
.solution-badge { padding:4px 8px; border-radius:999px; background:rgba(99,102,241,.1); color:#6366f1; font-size:12px; white-space:nowrap; }
.solution-section { border-top:1px solid rgba(100,116,139,.16); }
.solution-section summary { display:flex; align-items:center; gap:9px; cursor:pointer; list-style:none; padding:13px 2px; user-select:none; }
.solution-section summary::-webkit-details-marker { display:none; }
.solution-section-icon { color:#6366f1; font-size:13px; }
.solution-chevron { margin-left:auto; color:var(--text-muted,#94a3b8); transition:transform .2s ease; }
.solution-section[open] .solution-chevron { transform:rotate(180deg); }
.solution-section-body { padding:0 2px 15px 25px; font-size:14px; line-height:1.75; }
.solution-meta { display:grid; grid-template-columns:repeat(3,minmax(0,1fr)); gap:8px; margin-bottom:12px; color:var(--text-secondary,#64748b); font-size:13px; }
.solution-meta b { color:var(--text-primary,#172033); }
.solution-label { margin:10px 0 3px; color:var(--text-secondary,#64748b); font-size:12px; font-weight:700; }
.solution-lead { margin:0 0 8px; font-weight:600; }
.solution-section-body ul { margin:4px 0 0; padding-left:20px; }
.solution-steps { margin:0; padding-left:22px; }
.solution-steps li { padding-left:4px; margin-bottom:10px; }
.solution-steps p, .solution-item p { margin:2px 0 0; color:var(--text-secondary,#64748b); }
.solution-item { padding:9px 10px; margin:7px 0; border-radius:9px; background:rgba(99,102,241,.06); }
.solution-mistake { background:rgba(245,158,11,.08); }
.solution-muted { color:var(--text-muted,#94a3b8); margin:0; }
@media (max-width: 640px) {
  .solution-card { padding:14px; }
  .solution-meta { grid-template-columns:1fr; gap:4px; }
  .solution-card-head { flex-direction:column; }
}

/* ============================================
   Ability Tracker V2.1.0 - Complete Styles
   ============================================ */



@font-face {
  font-family: 'SairaCondensed';
  src: url('../fonts/SairaCondensed-Regular.woff2') format('woff2');
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: 'SairaCondensed';
  src: url('../fonts/SairaCondensed-SemiBold.woff2') format('woff2');
  font-weight: 600;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: 'SairaCondensed';
  src: url('../fonts/SairaCondensed-Bold.woff2') format('woff2');
  font-weight: 700;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: 'SairaCondensed';
  src: url('../fonts/SairaCondensed-Black.woff2') format('woff2');
  font-weight: 900;
  font-style: normal;
  font-display: swap;
}

:root {
  /* Light theme is the default. Dark values are scoped below to the
     explicit data-theme="dark" state instead of replacing this palette. */
  --bg-primary: #f7f8fa;
  --bg-secondary: #ffffff;
  --bg-card: #ffffff;
  --bg-input: #ffffff;
  --text-primary: #172033;
  --text-secondary: #64748b;
  --text-muted: #94a3b8;
  --accent-blue: #3b82f6;
  --accent-cyan: #22d3ee;
  --accent-purple: #8b5cf6;
  --accent-pink: #ec4899;
  --accent-green: #22c55e;
  --accent-yellow: #f59e0b;
  --accent-red: #ef4444;
  --border-radius: 12px;
  --transition: all 0.3s ease;
}

:root[data-theme="dark"] {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-card: #1e293b;
  --bg-input: #0f172a;
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
}

.hidden { display: none !important; }

/* ============ AUTH PAGE ============ */
#auth-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: radial-gradient(ellipse at top, #1e1b4b 0%, #0f172a 60%, #000000 100%);
  position: relative;
}

.auth-container {
  width: 100%;
  max-width: 420px;
  padding: 24px;
  z-index: 2;
}

.auth-card {
  background: rgba(30, 41, 59, 0.6);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(148, 163, 184, 0.1);
  border-radius: var(--border-radius);
  padding: 32px;
}

.auth-logo {
  text-align: center;
  margin-bottom: 24px;
}

.globe-3d {
  width: 100px;
  height: 100px;
  margin: 0 auto 16px;
}

.auth-title {
  font-size: 28px;
  font-weight: 700;
  color: #fff;
  text-align: center;
  margin-bottom: 8px;
}

.auth-version {
  font-size: 13px;
  color: var(--text-secondary);
  text-align: center;
  margin-bottom: 16px;
}

.auth-tagline {
  font-size: 14px;
  color: var(--text-muted);
  text-align: center;
  font-style: italic;
  margin-bottom: 32px;
}

.auth-btn {
  width: 100%;
  padding: 14px 24px;
  border-radius: var(--border-radius);
  border: none;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin-bottom: 12px;
}

.auth-btn-primary {
  background: linear-gradient(135deg, var(--accent-blue), #60a5fa);
  color: #fff;
}

.auth-btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(59, 130, 246, 0.4);
}

.auth-btn-secondary {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid rgba(148, 163, 184, 0.3);
}

.auth-btn-secondary:hover {
  background: rgba(148, 163, 184, 0.1);
}

.auth-features {
  font-size: 12px;
  color: var(--text-muted);
  text-align: center;
  margin-top: 20px;
  margin-bottom: 16px;
}

.auth-forgot {
  font-size: 13px;
  color: var(--text-muted);
  text-align: center;
  cursor: pointer;
  text-decoration: none;
}

.auth-forgot:hover {
  color: var(--accent-blue);
}

.auth-input {
  width: 100%;
  padding: 12px 16px;
  background: var(--bg-input);
  border: 1px solid rgba(148, 163, 184, 0.2);
  border-radius: 8px;
  color: var(--text-primary);
  font-size: 14px;
  margin-bottom: 12px;
  transition: var(--transition);
}

.auth-input:focus {
  outline: none;
  border-color: var(--accent-blue);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

.auth-input::placeholder {
  color: var(--text-muted);
}

.auth-form-title {
  font-size: 20px;
  font-weight: 600;
  text-align: center;
  margin-bottom: 24px;
  color: var(--text-primary);
}

.auth-form-back {
  font-size: 14px;
  color: var(--text-secondary);
  cursor: pointer;
  margin-bottom: 16px;
  display: inline-block;
}

.auth-form-back:hover {
  color: var(--accent-blue);
}

.auth-switch {
  text-align: center;
  font-size: 13px;
  color: var(--text-secondary);
  margin-top: 16px;
}

.auth-switch a {
  color: var(--accent-blue);
  cursor: pointer;
}

/* Password toggle */
.pwd-wrapper {
  position: relative;
  margin-bottom: 12px;
}

.pwd-wrapper .auth-input {
  margin-bottom: 0;
  padding-right: 40px;
}

.pwd-toggle {
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 4px;
}

.pwd-toggle:hover {
  color: var(--text-primary);
}

/* ============ NAVIGATION ============ */
.top-nav {
  background: rgba(15, 23, 42, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(148, 163, 184, 0.1);
  padding: 0 24px;
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 8px;
  height: 56px;
}

.nav-brand {
  font-weight: 700;
  color: var(--accent-cyan);
  display: flex;
  align-items: center;
  gap: 8px;
  margin-right: auto;
}

.nav-item {
  padding: 8px 16px;
  border-radius: 8px;
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 14px;
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
}

.nav-item:hover {
  color: var(--text-primary);
  background: rgba(148, 163, 184, 0.1);
}

.nav-item.active {
  color: var(--accent-blue);
  background: rgba(59, 130, 246, 0.15);
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-left: auto;
}

.nav-user {
  font-size: 13px;
  color: var(--text-secondary);
}

.nav-logout {
  padding: 6px 12px;
  border-radius: 6px;
  background: rgba(239, 68, 68, 0.15);
  border: 1px solid rgba(239, 68, 68, 0.3);
  color: var(--accent-red);
  font-size: 13px;
  cursor: pointer;
  transition: var(--transition);
}

.nav-logout:hover {
  background: rgba(239, 68, 68, 0.25);
}

.nav-refresh {
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 4px;
  margin-right: 8px;
}

.nav-refresh:hover {
  color: var(--accent-blue);
}

/* ============ MAIN APP ============ */
#main-app {
  min-height: 100vh;
  background: var(--bg-primary);
}

.page-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 24px;
}

.section-title {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 24px;
  color: var(--text-primary);
}

/* ============ DASHBOARD ============ */
.dashboard-header {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-bottom: 24px;
  align-items: stretch;
}

.total-ability-card {
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.2), rgba(139, 92, 246, 0.2));
  border: 1px solid rgba(59, 130, 246, 0.3);
  border-radius: var(--border-radius);
  padding: 24px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.total-ability-card.skill-card {
  background: linear-gradient(135deg, rgba(236, 72, 153, 0.2), rgba(168, 85, 247, 0.2));
  border: 1px solid rgba(236, 72, 153, 0.3);
}

.total-label {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.total-value {
  font-family: 'Orbitron', 'Arial Black', sans-serif;
  font-size: 56px;
  font-weight: 900;
  background: linear-gradient(135deg, #22d3ee 0%, #3b82f6 50%, #8b5cf6 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.1;
  margin-bottom: 8px;
  letter-spacing: 2px;
}

.total-value.skill-total-value {
  background: linear-gradient(135deg, #ec4899 0%, #a855f7 50%, #f472b6 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

@keyframes totalGlow {
  0%, 100% {
    filter: drop-shadow(0 0 10px rgba(34, 211, 238, 0.4)) drop-shadow(0 0 20px rgba(59, 130, 246, 0.3));
  }
  50% {
    filter: drop-shadow(0 0 20px rgba(34, 211, 238, 0.6)) drop-shadow(0 0 40px rgba(59, 130, 246, 0.5)) drop-shadow(0 0 60px rgba(139, 92, 246, 0.3));
  }
}

.total-sub {
  font-size: 12px;
  color: var(--text-muted);
}

.stat-pills {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.stat-pill {
  background: var(--bg-card);
  border: 1px solid rgba(148, 163, 184, 0.1);
  border-radius: var(--border-radius);
  padding: 16px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
}

.pill-label {
  font-size: 14px;
  color: var(--text-secondary);
}

.pill-value {
  font-size: 20px;
  font-weight: 700;
  color: var(--accent-cyan);
}

.dashboard-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}

.dashboard-card {
  background: var(--bg-card);
  border: 1px solid rgba(148, 163, 184, 0.1);
  border-radius: var(--border-radius);
  padding: 24px;
}

.dashboard-card.wide {
  grid-column: 1 / -1;
}

.dashboard-card h3 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 16px;
  color: var(--text-primary);
}

.no-data-tip {
  text-align: center;
  padding: 40px;
  color: var(--text-muted);
  font-size: 14px;
}

.subject-bar-row {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 20px;
}

.subject-name {
  width: 60px;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-secondary);
  flex-shrink: 0;
}

.bar-track {
  flex: 1;
  height: 24px;
  background: rgba(148, 163, 184, 0.1);
  border-radius: 12px;
  overflow: hidden;
  position: relative;
}

.bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent-blue), var(--accent-cyan));
  border-radius: 12px;
  transition: width 0.5s ease;
  position: relative;
}

.bar-fill.env-bar {
  background: linear-gradient(90deg, #f97316, #fbbf24);
}

.subject-val {
  width: 60px;
  text-align: right;
  font-size: 14px;
  font-weight: 600;
  color: var(--accent-cyan);
  flex-shrink: 0;
}

.dual-bar-container {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.dual-bar-row {
  display: flex;
  align-items: center;
  gap: 12px;
}

.bar-label {
  width: 40px;
  font-size: 12px;
  color: var(--text-muted);
  flex-shrink: 0;
}

.bar-value {
  width: 60px;
  text-align: right;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  flex-shrink: 0;
}

.skill-bar-row {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 16px;
}

.skill-name {
  width: 60px;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-secondary);
  flex-shrink: 0;
}

.bar-fill.skill-bar-fill {
  background: linear-gradient(90deg, #ec4899, #a855f7);
}

.skill-val {
  width: 60px;
  text-align: right;
  font-size: 14px;
  font-weight: 600;
  color: var(--accent-pink);
  flex-shrink: 0;
}

.quick-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.stat-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 16px;
  background: rgba(15, 23, 42, 0.5);
  border-radius: 8px;
}

.stat-name {
  font-size: 14px;
  color: var(--text-secondary);
}

.stat-num {
  font-size: 18px;
  font-weight: 700;
  color: var(--accent-cyan);
}

/* ============ LEADERBOARD ============ */
.leaderboard-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
  flex-wrap: wrap;
  gap: 16px;
}

.leader-filter {
  display: flex;
  gap: 12px;
}

.leader-filter select {
  padding: 8px 12px;
  background: var(--bg-input);
  border: 1px solid rgba(148, 163, 184, 0.2);
  border-radius: 8px;
  color: var(--text-primary);
  font-size: 14px;
}

.leader-header {
  display: grid;
  grid-template-columns: 70px 1.4fr 1.2fr 1.2fr;
  gap: 16px;
  padding: 12px 16px;
  background: rgba(15, 23, 42, 0.5);
  border-radius: 8px;
  font-size: 13px;
  color: var(--text-muted);
  font-weight: 600;
  margin-bottom: 8px;
}

.leader-row {
  display: grid;
  grid-template-columns: 70px 1.4fr 1.2fr 1.2fr;
  gap: 16px;
  padding: 12px 16px;
  background: var(--bg-card);
  border: 1px solid rgba(148, 163, 184, 0.1);
  border-radius: 8px;
  margin-bottom: 8px;
  align-items: center;
  transition: var(--transition);
}

.leader-row:hover {
  border-color: rgba(59, 130, 246, 0.3);
}

.leader-row.leader-me {
  background: rgba(59, 130, 246, 0.12);
  border-color: rgba(59, 130, 246, 0.4);
}

.leader-rank {
  font-weight: 700;
  color: var(--accent-yellow);
  font-size: 16px;
  text-align: center;
}

.leader-name {
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 8px;
}

.leader-avatar {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: linear-gradient(135deg, #3b82f6, #8b5cf6);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  color: #fff;
  flex-shrink: 0;
}

.leader-sort-val {
  font-weight: 800;
  font-size: 16px;
  color: #a855f7;
  text-align: center;
  background: rgba(168, 85, 247, 0.08);
  padding: 4px 8px;
  border-radius: 6px;
  border: 1px solid rgba(168, 85, 247, 0.2);
}

.leader-group {
  font-size: 13px;
  color: var(--text-secondary);
}

.leader-total {
  font-weight: 700;
  color: var(--accent-cyan);
  text-align: center;
  font-size: 15px;
}

.leader-empty {
  text-align: center;
  padding: 40px;
  color: var(--text-muted);
}

.leader-scroll {
  max-height: 500px;
  overflow-y: auto;
  margin-bottom: 16px;
}

.leader-footer {
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid rgba(148, 163, 184, 0.1);
}

.leader-me-bar {
  margin-top: 24px;
  padding: 16px;
  background: rgba(59, 130, 246, 0.1);
  border: 1px solid rgba(59, 130, 246, 0.3);
  border-radius: var(--border-radius);
  text-align: center;
  font-size: 14px;
}

/* ============ AI CHAT ============ */
.ai-chat-container {
  display: flex;
  flex-direction: column;
  height: calc(100vh - 200px);
  background: var(--bg-card);
  border: 1px solid rgba(148, 163, 184, 0.1);
  border-radius: var(--border-radius);
  overflow: hidden;
}

.ai-messages {
  flex: 1;
  overflow-y: auto;
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.msg-user, .msg-ai {
  max-width: 80%;
  padding: 12px 16px;
  border-radius: 12px;
  font-size: 14px;
  line-height: 1.5;
}

.msg-user {
  align-self: flex-end;
  background: var(--accent-blue);
  color: #fff;
}

.msg-ai {
  align-self: flex-start;
  background: rgba(148, 163, 184, 0.1);
  color: var(--text-primary);
}

.ai-input-area {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 12px 24px 16px;
  background: var(--bg-card);
}

/* Keep the composer visually continuous with the chat area. */
#page-ai-chat .ai-input-area {
  border-top: none !important;
}

.ai-input-row {
  display: flex;
  gap: 12px;
  align-items: center;
}

.ai-input {
  flex: 1;
  padding: 12px 16px;
  background: var(--bg-input);
  border: 1px solid rgba(148, 163, 184, 0.2);
  border-radius: 8px;
  color: var(--text-primary);
  font-size: 14px;
}

.ai-input:focus {
  outline: none;
  border-color: var(--accent-blue);
}

.ai-send {
  padding: 12px 24px;
  background: var(--accent-blue);
  border: none;
  border-radius: 8px;
  color: #fff;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}

.ai-send:hover {
  background: #60a5fa;
}

/* I6: AI message avatars and bubbles (V2.0.1 update) */
.ai-msg { display: flex; gap: 10px; margin-bottom: 14px; align-items: flex-start; max-width: 85%; }
.ai-msg-user { flex-direction: row-reverse; align-self: flex-end; }
.ai-msg-bot { align-self: flex-start; }
.ai-msg-avatar {
  width: 34px; height: 34px;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 17px;
  flex-shrink: 0;
}
.ai-msg-user .ai-msg-avatar { background: rgba(59,130,246,0.25); }
.ai-msg-bot .ai-msg-avatar { background: rgba(139,92,246,0.25); }
.ai-msg-bubble {
  padding: 10px 14px;
  border-radius: 12px;
  word-break: break-word;
  line-height: 1.55;
  font-size: 14px;
}
.ai-msg-user .ai-msg-bubble { background: rgba(59,130,246,0.18); color: #f1f5f9; border-top-right-radius: 4px; }
.ai-msg-bot .ai-msg-bubble { background: rgba(30,41,59,0.85); color: #e2e8f0; border-top-left-radius: 4px; border: 1px solid rgba(148,163,184,0.12); }
.ai-msg-bubble img { max-width: 220px; max-height: 220px; border-radius: 8px; display: block; margin-bottom: 6px; }

/* I4: 图片/文件上传按钮 */
.ai-upload-btn {
  background: rgba(59,130,246,0.15);
  border: 1px solid rgba(59,130,246,0.3);
  color: #60a5fa;
  padding: 0 12px;
  height: 38px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 13px;
  display: flex; align-items: center; justify-content: center;
  transition: var(--transition);
  flex-shrink: 0;
}
.ai-upload-btn:hover { background: rgba(59,130,246,0.28); transform: translateY(-1px); }

.ai-attachment-preview {
  display: none;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}
.ai-attachment-preview .att-item {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 4px 8px;
  background: rgba(15,23,42,0.6);
  border: 1px solid rgba(148,163,184,0.15);
  border-radius: 8px;
  font-size: 13px;
  color: var(--text-secondary);
}
.ai-attachment-preview .att-item img { width: 34px; height: 34px; object-fit: cover; border-radius: 4px; }
.ai-attachment-preview .att-item button {
  background: rgba(239,68,68,0.2);
  border: none; color: #fca5a5;
  width: 20px; height: 20px;
  border-radius: 50%;
  cursor: pointer;
  font-size: 11px;
  display: flex; align-items: center; justify-content: center;
}
.ai-attachment-preview .att-item button:hover { background: rgba(239,68,68,0.35); }

/* ============ QUESTION BANK ============ */
.qbank-subjects {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 24px;
}

.subject-btn {
  padding: 10px 20px;
  background: var(--bg-card);
  border: 1px solid rgba(148, 163, 184, 0.2);
  border-radius: 8px;
  color: var(--text-secondary);
  font-size: 14px;
  cursor: pointer;
  transition: var(--transition);
}

.subject-btn:hover {
  border-color: var(--accent-blue);
  color: var(--text-primary);
}

.subject-btn.active {
  background: rgba(59, 130, 246, 0.2);
  border-color: var(--accent-blue);
  color: var(--accent-blue);
}

/* ============ SETTINGS ============ */
.settings-section {
  background: var(--bg-card);
  border: 1px solid rgba(148, 163, 184, 0.1);
  border-radius: var(--border-radius);
  padding: 24px;
  margin-bottom: 24px;
}

.settings-section h3 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 16px;
  color: var(--text-primary);
}

.subject-checkbox {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 0;
  color: var(--text-secondary);
  cursor: pointer;
}

.subject-checkbox input {
  width: 18px;
  height: 18px;
  accent-color: var(--accent-blue);
}

/* ============ ADMIN PANEL ============ */
.admin-card {
  background: var(--bg-card);
  border: 1px solid rgba(139, 92, 246, 0.3);
  border-radius: var(--border-radius);
  padding: 24px;
  margin-bottom: 24px;
}

.admin-card h3 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 16px;
  color: var(--accent-purple);
  display: flex;
  align-items: center;
  gap: 8px;
}

.admin-input-row {
  display: flex;
  gap: 12px;
  margin-bottom: 16px;
}

.admin-input-row .auth-input {
  flex: 1;
  margin-bottom: 0;
}

.admin-btn {
  padding: 12px 20px;
  background: var(--accent-blue);
  border: none;
  border-radius: 8px;
  color: #fff;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
}

.admin-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.admin-list-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 16px;
  background: rgba(15, 23, 42, 0.5);
  border-radius: 8px;
}

.admin-badge {
  padding: 4px 12px;
  background: var(--accent-purple);
  color: #fff;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
}

.admin-remove {
  padding: 6px 12px;
  background: transparent;
  border: 1px solid var(--accent-red);
  color: var(--accent-red);
  border-radius: 6px;
  font-size: 13px;
  cursor: pointer;
}

/* ============ FORM CARD ============ */
.form-card {
  background: var(--bg-card);
  border: 1px solid rgba(148, 163, 184, 0.1);
  border-radius: var(--border-radius);
  padding: 24px;
  margin-bottom: 24px;
}

.form-card h3, .form-card h4 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 20px;
  color: var(--text-primary);
}

.form-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
}

.form-header h3 {
  margin-bottom: 0;
}

/* ============ DIFFICULTY SECTION ============ */
.difficulty-section {
  background: rgba(15, 23, 42, 0.5);
  border: 1px solid rgba(148, 163, 184, 0.1);
  border-radius: 8px;
  padding: 20px;
  margin: 20px 0;
}

.difficulty-section h4 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 16px;
  color: var(--accent-purple);
}

.diff-preview {
  display: flex;
  align-items: center;
  gap: 20px;
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid rgba(148, 163, 184, 0.1);
  flex-wrap: wrap;
}

.diff-total {
  font-size: 18px;
  font-weight: 700;
  color: var(--accent-cyan);
}

.diff-badge-preview {
  display: flex;
  align-items: center;
}

.diff-scale {
  font-size: 12px;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ============ QUESTION ANSWER ============ */
.question-answer {
  margin-top: 16px;
  padding: 16px;
  background: rgba(34, 197, 94, 0.05);
  border: 1px solid rgba(34, 197, 94, 0.2);
  border-radius: 8px;
}

.answer-label {
  font-size: 14px;
  font-weight: 600;
  color: var(--accent-green);
  margin-bottom: 8px;
}

.answer-content {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
  white-space: pre-wrap;
}

/* ============ ADMIN DESC/FOOTER ============ */
.admin-desc {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 16px;
  line-height: 1.5;
}

.admin-footer {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 16px;
  text-align: center;
}

/* ============ SUBJECT GRID ============ */
.subject-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  gap: 12px;
}

/* Diff badge styles in V2 block below */

/* ============ FORMS ============ */
.form-group {
  margin-bottom: 20px;
}

.form-label {
  display: block;
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.form-label .required {
  color: var(--accent-red);
}

.form-input, .form-select, .form-textarea {
  width: 100%;
  padding: 12px 16px;
  background: var(--bg-input);
  border: 1px solid rgba(148, 163, 184, 0.2);
  border-radius: 8px;
  color: var(--text-primary);
  font-size: 14px;
  transition: var(--transition);
}

.form-input:focus, .form-select:focus, .form-textarea:focus {
  outline: none;
  border-color: var(--accent-blue);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

.form-textarea {
  min-height: 120px;
  resize: vertical;
  font-family: inherit;
}

.form-range {
  width: 100%;
  height: 6px;
  -webkit-appearance: none;
  appearance: none;
  background: rgba(148, 163, 184, 0.2);
  border-radius: 3px;
  outline: none;
  cursor: pointer;
}

.form-range::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--slider-thumb-color, var(--accent-cyan));
  cursor: pointer;
  border: 2px solid var(--bg-secondary);
  box-shadow: 0 0 6px var(--slider-thumb-color, rgba(34,211,238,0.5));
  transition: transform 0.2s, background 0.2s, box-shadow 0.2s;
}

.form-range::-webkit-slider-thumb:hover {
  transform: scale(1.2);
}

.form-range::-moz-range-thumb {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--slider-thumb-color, var(--accent-cyan));
  cursor: pointer;
  border: 2px solid var(--bg-secondary);
  box-shadow: 0 0 6px var(--slider-thumb-color, rgba(34,211,238,0.5));
}

/* 题型属性 radio 标签选中态高亮 */
.qbank-attr-radio-label:has(input[type="radio"]:checked) {
  border-color: var(--accent-cyan) !important;
  background: rgba(34, 211, 238, 0.12) !important;
}
.qbank-attr-radio-label:has(input[type="radio"]:checked) span {
  color: var(--accent-cyan);
  font-weight: 600;
}

.form-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
}

.form-actions {
  display: flex;
  gap: 12px;
  justify-content: flex-end;
  margin-top: 24px;
}

.btn {
  padding: 12px 24px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  border: none;
}

.btn-primary {
  background: var(--accent-blue);
  color: #fff;
}

.btn-primary:hover {
  background: #60a5fa;
}

.btn-secondary {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid rgba(148, 163, 184, 0.3);
}

.btn-secondary:hover {
  background: rgba(148, 163, 184, 0.1);
  color: var(--text-primary);
}

/* ============ PLAN ITEMS ============ */
.plan-item {
  border-radius: 12px;
  padding: 0;
  margin-bottom: 14px;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  align-items: stretch;
  gap: 0;
  overflow: hidden;
  position: relative;
  height: auto;
  min-height: 90px;
  background: rgba(55, 65, 81, 0.6);
  border: 1px solid rgba(148, 163, 184, 0.1);
}

.plan-item.plan-completed {
  opacity: 0.9;
  border-color: rgba(34, 197, 94, 0.3);
}

.plan-info {
  flex: 1;
  min-width: 0;
  padding: 14px 16px;
  position: relative;
  z-index: 2;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.plan-title-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0;
}

.plan-title-right {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

.plan-info h4 {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  margin: 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.plan-title-row span {
  font-size: 12px;
  color: var(--text-muted);
  flex-shrink: 0;
  margin-left: 12px;
}

.plan-progress-track {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
  background: transparent;
  border-radius: 12px;
  overflow: hidden;
}

.plan-progress-track .plan-progress-fill {
  height: 100%;
  background: rgba(107, 114, 128, 0.4);
  border-radius: 12px;
  transition: width 0.5s ease;
}

.plan-completed .plan-progress-track .plan-progress-fill {
  background: linear-gradient(90deg, rgba(34, 197, 94, 0.8), rgba(22, 163, 74, 0.9));
  width: 100% !important;
}

.plan-meta {
  font-size: 12px;
  color: var(--text-muted);
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  align-items: center;
}

.plan-meta span {
  display: inline;
}

.plan-meta b {
  color: var(--text-primary);
  font-weight: 600;
}

.plan-meta-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.plan-actions-inline {
  display: flex;
  gap: 6px;
  flex-shrink: 0;
}

.plan-actions-inline .btn-sm {
  padding: 2px 8px;
  font-size: 11px;
  background: rgba(255,255,255,0.1);
  border: 1px solid rgba(255,255,255,0.15);
  color: #cbd5e1;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.15s;
}

.plan-actions-inline .btn-sm:hover {
  background: rgba(255,255,255,0.18);
  color: #fff;
}

.plan-completed .plan-actions-inline .btn-sm {
  background: rgba(255,255,255,0.08);
  border-color: rgba(255,255,255,0.12);
  color: #bbf7d0;
}

.plan-completed .plan-actions-inline .btn-sm:hover {
  background: rgba(255,255,255,0.15);
}

.plan-delta {
  font-size: 11px;
}

.plan-delta.delta-up {
  color: var(--accent-green);
}

.plan-delta.delta-down {
  color: var(--accent-red);
}

/* 计划推荐列表样式 */
.plan-recommendations {
  background: rgba(59, 130, 246, 0.08);
  border: 1px solid rgba(59, 130, 246, 0.25);
  border-radius: 8px;
  padding: 12px 14px;
  margin-bottom: 12px;
}
.plan-recom-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 8px;
  margin-top: 8px;
}
.plan-recom-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 8px 10px;
  background: rgba(15, 23, 42, 0.6);
  border: 1px solid rgba(148, 163, 184, 0.15);
  border-radius: 6px;
  cursor: pointer;
  transition: var(--transition);
  font-size: 12px;
}
.plan-recom-item:hover {
  border-color: rgba(59, 130, 246, 0.5);
  background: rgba(59, 130, 246, 0.1);
  transform: translateY(-1px);
}
.recom-subj {
  color: #93c5fd;
  font-weight: 600;
  font-size: 11px;
}
.recom-block {
  color: var(--text-primary);
  font-weight: 600;
}
.recom-ability {
  color: #94a3b8;
  font-size: 11px;
}
.recom-gain {
  font-family: 'Orbitron', 'SF Mono', 'Courier New', 'Microsoft YaHei', sans-serif;
  font-size: 11px;
  font-weight: 700;
}
.recom-gain.gain-up { color: #86efac; }
.recom-gain.gain-down { color: #fca5a5; }

.plan-status-badge {
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 11px;
  font-weight: 600;
}

.plan-status-badge.pending {
  background: rgba(245, 158, 11, 0.15);
  color: var(--accent-yellow);
}

.plan-status-badge.completed {
  background: rgba(34, 197, 94, 0.15);
  color: var(--accent-green);
}

.overdue-badge {
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 11px;
  font-weight: 600;
  background: rgba(239, 68, 68, 0.15);
  color: var(--accent-red);
}

/* Legacy .plan-progress removed; now using .plan-progress-track */

/* Plan deadline status colors */
.plan-deadline-normal {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 11px;
  background: rgba(59,130,246,0.15);
  color: #93c5fd;
  border: 1px solid rgba(59,130,246,0.3);
}
.plan-deadline-urgent {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 11px;
  background: rgba(251,146,60,0.2);
  color: #fdba74;
  border: 1px solid rgba(251,146,60,0.4);
}
.plan-deadline-overdue {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 11px;
  background: rgba(239,68,68,0.2);
  color: #fca5a5;
  border: 1px solid rgba(239,68,68,0.4);
}
.plan-deadline-done {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 11px;
  background: rgba(34,197,94,0.2);
  color: #86efac;
  border: 1px solid rgba(34,197,94,0.4);
}
.plan-deadline-none {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 11px;
  background: rgba(100,116,139,0.15);
  color: #94a3b8;
  border: 1px solid rgba(100,116,139,0.3);
}

.plan-progress-text {
  font-size: 13px;
  font-weight: 700;
  font-family: 'Orbitron', 'SF Mono', 'Courier New', monospace;
  color: #d1d5db;
}

.plan-completed .plan-progress-text {
  color: #86efac;
}

/* Legacy .plan-actions / .plan-progress-fill overrides replaced by .plan-progress-track */

.deadline-overdue {
  color: var(--accent-red) !important;
}

.deadline-normal {
  color: var(--text-muted);
}

/* ============ QUESTION CARD ============ */
.question-card {
  background: var(--bg-card);
  border: 1px solid rgba(148, 163, 184, 0.1);
  border-radius: var(--border-radius);
  padding: 24px;
  margin-bottom: 16px;
  position: relative;
}

.question-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 16px;
}

.question-tags {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.question-tag {
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
}

.question-tag.subject {
  background: rgba(139, 92, 246, 0.2);
  color: var(--accent-purple);
}

.question-tag.type {
  background: rgba(59, 130, 246, 0.2);
  color: var(--accent-blue);
}

.question-tag.knowledge {
  background: rgba(34, 211, 238, 0.2);
  color: var(--accent-cyan);
}

/* 题目卡片左上角 - 难度档位标签 (EASY/NORMAL/HARD/MASTER/INSANE/BEYOND) */
.question-tag.diff-label {
  display: inline-block;
  font-size: 12px;
  padding: 3px 10px;
  border-radius: 8px;
  font-family: 'Orbitron', 'Courier New', monospace;
  font-weight: 700;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  box-shadow: 0 0 6px rgba(0,0,0,0.2);
}

.question-tag.diff-label[data-level="EASY"]   { background: rgba(16,185,129,0.12);  color: #10b981; border: 1px solid rgba(16,185,129,0.35); }
.question-tag.diff-label[data-level="NORMAL"] { background: rgba(59,130,246,0.12);  color: #3b82f6; border: 1px solid rgba(59,130,246,0.35); }
.question-tag.diff-label[data-level="HARD"]   { background: rgba(168,85,247,0.12);  color: #a855f7; border: 1px solid rgba(168,85,247,0.35); }
.question-tag.diff-label[data-level="MASTER"] { background: rgba(245,158,11,0.12);  color: #f59e0b; border: 1px solid rgba(245,158,11,0.35); }
.question-tag.diff-label[data-level="INSANE"] { background: rgba(239,68,68,0.12);   color: #ef4444; border: 1px solid rgba(239,68,68,0.35); }
.question-tag.diff-label[data-level="BEYOND"] { background: rgba(236,72,153,0.12);  color: #ec4899; border: 1px solid rgba(236,72,153,0.35); }

/* 题目卡片左上角 - 难度徽章与标签容器 */
.question-header {
  justify-content: flex-start;
}

.question-content {
  font-size: 20px;
  line-height: 1.8;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 16px;
}

.question-actions {
  display: flex;
  gap: 12px;
  justify-content: flex-end;
}

.question-btn {
  padding: 8px 16px;
  border-radius: 8px;
  font-size: 13px;
  cursor: pointer;
  transition: var(--transition);
  border: none;
  display: flex;
  align-items: center;
  gap: 6px;
}

.question-btn.edit {
  background: rgba(245, 158, 11, 0.2);
  color: var(--accent-yellow);
}

.question-btn.delete {
  background: rgba(239, 68, 68, 0.2);
  color: var(--accent-red);
}

.question-btn.answer {
  background: rgba(34, 197, 94, 0.2);
  color: var(--accent-green);
}

.history-stats-bar {
  display: flex;
  gap: 12px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.hs-total {
  flex: 1;
  min-width: 140px;
  background: rgba(15, 23, 42, 0.9);
  border: 1px solid rgba(148,163,184,0.08);
  border-radius: 10px;
  padding: 20px 16px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.hs-label { font-size: 12px; color: var(--text-muted); }
.hs-num { font-size: 28px; font-weight: 700; font-family: 'SF Mono', 'Consolas', 'Courier New', 'Microsoft YaHei', sans-serif; }
.hs-num-q { color: var(--accent-cyan); }
.hs-num-ex { color: var(--accent-purple); }
.hs-num-pl { color: #22c55e; }
.hs-num-tq { color: var(--accent-yellow); }

.history-stats-by-subj {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 24px;
}

.hs-col {
  background: var(--bg-card);
  border: 1px solid rgba(148,163,184,0.1);
  border-radius: 8px;
  padding: 8px 12px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  min-width: 64px;
}

.hs-subject { font-size: 11px; color: var(--text-muted); }
.hs-q { font-size: 14px; color: var(--accent-cyan); font-weight: 600; }
.hs-ex { font-size: 14px; color: var(--accent-purple); font-weight: 600; }
.hs-pl { font-size: 14px; color: #22c55e; font-weight: 600; }

.history-clear-btns {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 16px;
}

.history-clear-btn {
  padding: 8px 16px;
  font-size: 13px;
  border: 1px solid rgba(239, 68, 68, 0.3);
  border-radius: 8px;
  background: rgba(239, 68, 68, 0.1);
  color: var(--accent-red);
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  gap: 6px;
}

.history-clear-btn:hover {
  background: rgba(239, 68, 68, 0.2);
  border-color: rgba(239, 68, 68, 0.5);
}

.history-events-title {
  margin-top: 24px;
  font-weight: 600;
  font-size: 14px;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.history-event-row {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  background: rgba(15, 23, 42, 0.6);
  border: 1px solid rgba(148,163,184,0.08);
  border-radius: 8px;
  margin-bottom: 8px;
}

.event-icon {
  font-size: 16px;
  width: 24px;
  text-align: center;
}

.event-detail {
  flex: 1;
  font-size: 13px;
  color: var(--text-primary);
}

.event-status {
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 4px;
}

.event-status.completed {
  background: rgba(34, 197, 94, 0.15);
  color: var(--accent-green);
}

.event-status.exam {
  background: rgba(168, 85, 247, 0.15);
  color: var(--accent-purple);
}

.event-date {
  font-size: 12px;
  color: var(--text-muted);
}

.event-undo-btn {
  padding: 4px 10px;
  font-size: 12px;
  border: 1px solid rgba(239, 68, 68, 0.3);
  border-radius: 6px;
  background: rgba(239, 68, 68, 0.1);
  color: var(--accent-red);
  cursor: pointer;
  transition: var(--transition);
  flex-shrink: 0;
}

.event-undo-btn:hover {
  background: rgba(239, 68, 68, 0.2);
  border-color: rgba(239, 68, 68, 0.5);
}

.history-event {
  background: var(--bg-card);
  border: 1px solid rgba(148,163,184,0.08);
  border-radius: 8px;
  padding: 12px 16px;
  margin-bottom: 8px;
}

.he-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 6px;
}

.he-desc { font-size: 13px; font-weight: 500; }
.he-time { font-size: 11px; color: var(--text-muted); }

.he-changes { display: flex; gap: 6px; flex-wrap: wrap; }

.ev-chip {
  padding: 2px 8px;
  border-radius: 10px;
  font-size: 11px;
  font-weight: 600;
}

.ev-up { background: rgba(34,197,94,0.15); color: #22c55e; }
.ev-down { background: rgba(239,68,68,0.15); color: #ef4444; }
.no-change { font-size: 11px; color: var(--text-muted); }

/* Settings danger zone */
.settings-danger {
  border: 1px solid rgba(239,68,68,0.3);
  border-radius: 10px;
  padding: 16px;
  background: rgba(239,68,68,0.05);
}

.settings-desc { font-size: 13px; color: var(--text-secondary); margin-bottom: 8px; }

.btn-danger {
  background: rgba(239,68,68,0.15);
  border: 1px solid rgba(239,68,68,0.4);
  color: #ef4444;
  padding: 8px 20px;
  border-radius: 8px;
  font-size: 14px;
  cursor: pointer;
  transition: var(--transition);
}

.btn-danger:hover { background: rgba(239,68,68,0.25); }

.settings-section h3 { font-size: 15px; margin-bottom: 10px; }

.subject-maxscore {
  width: 64px;
  padding: 4px 8px;
  border-radius: 6px;
  border: 1px solid rgba(148,163,184,0.25);
  background: var(--bg-card);
  color: var(--text-primary);
  font-size: 12px;
}

/* ============ HISTORY ITEM ============ */
.history-item {
  background: var(--bg-card);
  border: 1px solid rgba(148, 163, 184, 0.1);
  border-radius: var(--border-radius);
  padding: 16px 20px;
  margin-bottom: 12px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.history-info {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.history-title {
  font-weight: 600;
  font-size: 14px;
}

.history-meta {
  font-size: 12px;
  color: var(--text-muted);
}

.history-score {
  font-size: 18px;
  font-weight: 700;
  color: var(--accent-cyan);
}

/* ============ PAGE LOADING/ERROR ============ */
.page-loading, .page-error {
  text-align: center;
  padding: 60px 24px;
  color: var(--text-muted);
}

.page-error {
  color: var(--accent-red);
}

/* ============ CHECKBOX ============ */
.checkbox-label {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  color: var(--text-secondary);
  font-size: 14px;
}

.checkbox-label input {
  width: 18px;
  height: 18px;
  accent-color: var(--accent-blue);
}

/* ============ RESPONSIVE ============ */
@media (max-width: 768px) {
  .dashboard-header {
    grid-template-columns: 1fr;
  }
  
  .dashboard-grid {
    grid-template-columns: 1fr;
  }
  
  .nav-inner {
    flex-wrap: wrap;
    height: auto;
    padding: 8px 0;
  }
  
  .nav-item {
    font-size: 12px;
    padding: 6px 10px;
  }
  
  .plan-item {
    min-height: 80px;
  }
  
  .leader-header, .leader-row {
    grid-template-columns: 40px 1fr 80px 80px;
    gap: 8px;
    font-size: 12px;
  }
  
  .auth-container {
    padding: 16px;
  }
  
  .auth-card {
    padding: 24px;
  }
}

/* ============ CHART VIEW TOGGLE ============ */
.chart-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.chart-header h3 { margin-bottom: 0; }

.chart-toggle {
  display: flex;
  gap: 2px;
  background: rgba(148,163,184,0.1);
  border-radius: 8px;
  padding: 2px;
}

.chart-toggle-btn {
  padding: 4px 14px;
  border-radius: 6px;
  border: none;
  background: transparent;
  color: var(--text-secondary);
  font-size: 12px;
  cursor: pointer;
  transition: var(--transition);
}

.chart-toggle-btn.active {
  background: var(--accent-blue);
  color: #fff;
}

.chart-toggle-btn:hover:not(.active) {
  color: var(--text-primary);
  background: rgba(148,163,184,0.15);
}

.chart-view canvas {
  width: 100%;
  max-width: 600px;
}

.subject-bars-wrap {
  margin-bottom: 16px;
}

.skill-bars-wrap {
  margin-bottom: 16px;
}

.skill-bar-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 10px;
}

.skill-name {
  width: 60px;
  font-size: 13px;
  color: var(--text-secondary);
  flex-shrink: 0;
}

.skill-bar-track {
  flex: 1;
  height: 8px;
  background: rgba(148, 163, 184, 0.1);
  border-radius: 4px;
  overflow: hidden;
  position: relative;
}

.skill-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent-purple), var(--accent-pink));
  border-radius: 4px;
  transition: width 0.5s ease;
}

.skill-val {
  width: 50px;
  text-align: right;
  font-size: 13px;
  font-weight: 600;
  color: var(--accent-purple);
  flex-shrink: 0;
}

.env-ref-tip {
  font-size: 12px;
  color: var(--accent-yellow);
  padding: 8px 12px;
  background: rgba(245, 158, 11, 0.1);
  border: 1px solid rgba(245, 158, 11, 0.2);
  border-radius: 6px;
  margin-bottom: 12px;
}

/* Auth success message */
.auth-success {
  padding: 10px 16px;
  border-radius: 8px;
  background: rgba(34,197,94,0.15);
  border: 1px solid rgba(34,197,94,0.3);
  color: #22c55e;
  font-size: 13px;
  text-align: center;
  margin-bottom: 12px;
}

/* ============================================
   Plan sorting bar
   ============================================ */
.plan-sort-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 16px;
  font-size: 13px;
  color: var(--text-muted);
}
.plan-sort-bar .sort-btn {
  padding: 4px 12px;
  border: 1px solid rgba(148,163,184,0.25);
  border-radius: 16px;
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 12px;
  transition: var(--transition);
}
.plan-sort-bar .sort-btn:hover {
  background: var(--accent-blue);
  color: #fff;
  border-color: var(--accent-blue);
}

/* Plan item enhancements */
.plan-completed { opacity: 0.7; }
.plan-completed .plan-status.completed { background: rgba(34,197,94,0.2); color: #22c55e; }
.deadline-overdue { color: #ef4444; }
.deadline-normal { color: var(--text-secondary); }
.overdue-badge {
  display: inline-block;
  background: #ef4444;
  color: #fff;
  font-size: 10px;
  padding: 1px 6px;
  border-radius: 10px;
  margin-left: 6px;
  vertical-align: middle;
}
.plan-actions .btn-sm {
  padding: 4px 12px;
  font-size: 12px;
  border: 1px solid rgba(239,68,68,0.3);
  color: #ef4444;
  background: transparent;
  border-radius: 6px;
  cursor: pointer;
}
.plan-actions .btn-sm:hover { background: rgba(239,68,68,0.15); }

/* ============================================
   Qbank subject filter buttons
   ============================================ */
.qbank-subjects {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
}
/* ============================================
   Registration success message
   ============================================ */
.reg-success-msg {
  color: #22c55e;
  font-size: 0.95rem;
  text-align: center;
  display: block;
}

/* ============================================
   Knowledge block management
   ============================================ */
.knowledge-block-tag {
  display: inline-block;
  padding: 2px 10px;
  border-radius: 12px;
  font-size: 11px;
  background: rgba(59,130,246,0.12);
  color: var(--accent-blue);
  margin: 2px 4px;
  cursor: pointer;
  transition: var(--transition);
}
.knowledge-block-tag:hover { background: rgba(59,130,246,0.25); }
.knowledge-block-tag.selected { background: var(--accent-blue); color: #fff; }

.qbank-knowledge-filter {
  display: flex; flex-wrap: wrap; gap: 4px;
  margin-bottom: 12px;
}
.qbank-knowledge-filter h4 {
  width: 100%; font-size: 13px; color: var(--text-muted);
  margin: 0 0 4px 0;
}

/* ============================================
   Knowledge Blocks Section
   ============================================ */
.knowledge-blocks-section {
  background: var(--bg-card);
  border: 1px solid rgba(148, 163, 184, 0.1);
  border-radius: var(--border-radius);
  padding: 20px;
  margin-bottom: 24px;
}

.knowledge-blocks-section.empty {
  text-align: center;
}

.knowledge-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}

.knowledge-header h4 {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
  margin: 0;
}

.knowledge-sub {
  font-size: 12px;
  color: var(--text-muted);
}

.knowledge-blocks-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 10px;
}

/* V2.1.1 新版知识板块卡片 - 全宽竖向排列 */
.knowledge-blocks-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.knowledge-block-card-v2 {
  background: rgba(15, 23, 42, 0.6);
  border: 1px solid rgba(148, 163, 184, 0.12);
  border-radius: 12px;
  padding: 14px 18px;
  transition: all 0.2s;
  width: 100%;
}
.knowledge-block-card-v2:hover {
  border-color: rgba(99, 102, 241, 0.4);
  background: rgba(99, 102, 241, 0.05);
}
.knowledge-block-card-v2.in-exam {
  border-color: rgba(59, 130, 246, 0.4);
  background: rgba(59, 130, 246, 0.06);
}
.knowledge-block-card-v2.in-exam:hover {
  border-color: rgba(59, 130, 246, 0.7);
  background: rgba(59, 130, 246, 0.1);
}
.kbv2-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
}
.kbv2-left {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 1;
  min-width: 0;
}
.kbv2-name {
  font-size: 15px;
  font-weight: 600;
  color: #e2e8f0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.kbv2-mastery {
  display: inline-block;
  padding: 2px 10px;
  border-radius: 12px;
  font-size: 11px;
  font-weight: 700;
  white-space: nowrap;
}
.mastery-mastered { background: rgba(16,185,129,0.15); color: #10b981; border: 1px solid rgba(16,185,129,0.3); }
.mastery-skilled { background: rgba(6,182,212,0.15); color: #06b6d4; border: 1px solid rgba(6,182,212,0.3); }
.mastery-normal { background: rgba(245,158,11,0.15); color: #f59e0b; border: 1px solid rgba(245,158,11,0.3); }
.mastery-weak { background: rgba(239,68,68,0.15); color: #ef4444; border: 1px solid rgba(239,68,68,0.3); }
.mastery-none { background: rgba(100,116,139,0.15); color: #94a3b8; border: 1px solid rgba(100,116,139,0.3); }
.kbv2-right {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}
.kbv2-ability {
  font-size: 22px;
  font-weight: 700;
  font-family: 'Orbitron', 'SF Mono', 'Courier New', 'Microsoft YaHei', sans-serif;
  color: #67e8f9;
  min-width: 48px;
  text-align: right;
}
.kbv2-count {
  font-size: 12px;
  color: #94a3b8;
  white-space: nowrap;
}
.kbv2-action-btn {
  background: rgba(99, 102, 241, 0.15);
  border: 1px solid rgba(99, 102, 241, 0.3);
  color: #a5b4fc;
  padding: 6px 14px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 12px;
  font-weight: 600;
  white-space: nowrap;
  transition: all 0.2s;
}
.kbv2-action-btn:hover {
  background: rgba(99, 102, 241, 0.25);
  border-color: rgba(99, 102, 241, 0.5);
  color: #c7d2fe;
}
.kbv2-bar-wrap {
  margin-top: 10px;
  height: 5px;
  background: rgba(148, 163, 184, 0.1);
  border-radius: 3px;
  overflow: hidden;
}
.kbv2-bar {
  height: 100%;
  border-radius: 3px;
  transition: width 0.4s;
}

.knowledge-block-card {
  background: rgba(15, 23, 42, 0.6);
  border: 1px solid rgba(148, 163, 184, 0.1);
  border-radius: 10px;
  padding: 12px 14px;
  cursor: pointer;
  transition: var(--transition);
}

.knowledge-block-card:hover {
  border-color: rgba(59, 130, 246, 0.4);
  background: rgba(59, 130, 246, 0.05);
}

/* 考纲内板块：蓝色高亮边框 */
.knowledge-block-card.in-exam {
  border-color: rgba(59, 130, 246, 0.5);
  background: rgba(59, 130, 246, 0.08);
}

.knowledge-block-card.in-exam:hover {
  border-color: rgba(59, 130, 246, 0.8);
  background: rgba(59, 130, 246, 0.12);
}

/* 考纲/非考纲标签 */
.kb-exam-tag {
  display: inline-block;
  padding: 2px 8px;
  background: rgba(59, 130, 246, 0.2);
  color: #93c5fd;
  border: 1px solid rgba(59, 130, 246, 0.4);
  border-radius: 4px;
  font-size: 11px;
  font-weight: 600;
  margin-right: 4px;
}

.kb-noexam-tag {
  display: inline-block;
  padding: 2px 8px;
  background: rgba(100, 116, 139, 0.15);
  color: #94a3b8;
  border: 1px solid rgba(100, 116, 139, 0.3);
  border-radius: 4px;
  font-size: 11px;
  margin-right: 4px;
}

/* 30 题预览样式 */
.kb-preview-header {
  display: flex;
  justify-content: space-between;
  padding: 6px 0;
  font-size: 12px;
  color: #94a3b8;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  margin-bottom: 6px;
}

.kb-preview-header b {
  color: #67e8f9;
  font-family: 'Orbitron', 'SF Mono', 'Courier New', 'Microsoft YaHei', sans-serif;
}

.kb-preview-list {
  margin-top: 8px;
  max-height: 320px;
  overflow-y: auto;
}

.kb-preview-item {
  display: grid;
  grid-template-columns: 40px 100px 1fr 1fr;
  gap: 8px;
  padding: 4px 8px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  font-size: 12px;
  align-items: center;
}

.kb-preview-item:hover {
  background: rgba(255, 255, 255, 0.03);
}

.kb-preview-no {
  color: #64748b;
  font-family: 'Orbitron', 'SF Mono', 'Courier New', 'Microsoft YaHei', sans-serif;
}

.kb-preview-diff {
  color: #fbbf24;
  font-weight: 600;
}

.kb-preview-score {
  color: #93c5fd;
}

.kb-preview-acc {
  color: #86efac;
}

.kb-preview-empty {
  padding: 16px;
  text-align: center;
  color: #64748b;
  font-size: 12px;
}

.knowledge-block-header {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.knowledge-block-name {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-primary);
  flex: 1;
}

.knowledge-block-ability {
  font-size: 14px;
  font-weight: 700;
  color: var(--accent-cyan);
  font-family: 'Orbitron', 'SF Mono', 'Courier New', 'Microsoft YaHei', sans-serif;
}

.knowledge-block-count {
  font-size: 11px;
  color: var(--text-muted);
}

.knowledge-block-detail {
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px solid rgba(148, 163, 184, 0.1);
}

.knowledge-ability-bar {
  height: 4px;
  background: rgba(148, 163, 184, 0.1);
  border-radius: 2px;
  overflow: hidden;
  margin-bottom: 10px;
}

.knowledge-ability-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent-cyan), var(--accent-blue));
  border-radius: 2px;
  transition: width 0.3s ease;
}

.knowledge-block-actions {
  display: flex;
  gap: 8px;
}

.kb-action-btn {
  flex: 1;
  padding: 6px 10px;
  font-size: 11px;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  transition: var(--transition);
  background: rgba(59, 130, 246, 0.15);
  color: var(--accent-blue);
}

.kb-action-btn:hover {
  background: rgba(59, 130, 246, 0.25);
}

.kb-action-btn.delete {
  background: rgba(239, 68, 68, 0.15);
  color: var(--accent-red);
}

.kb-action-btn.delete:hover {
  background: rgba(239, 68, 68, 0.25);
}

.kb-number {
  font-family: 'Orbitron', 'SF Mono', 'Courier New', sans-serif;
  font-weight: 700;
  font-size: 14px;
  color: var(--accent-cyan);
  letter-spacing: 0.5px;
}

.kb-stat-row {
  display: flex;
  gap: 12px;
  margin-bottom: 12px;
  flex-wrap: wrap;
}

.kb-stat-item {
  flex: 1;
  min-width: 80px;
  text-align: center;
  padding: 8px;
  background: rgba(15, 23, 42, 0.5);
  border-radius: 6px;
}

.kb-stat-label {
  display: block;
  font-size: 11px;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.kb-stat-value {
  display: block;
  font-size: 16px;
  font-weight: 700;
  color: var(--accent-cyan);
}

.knowledge-add-btn {
  width: 100%;
  margin-top: 12px;
  padding: 10px;
  font-size: 13px;
  border: 1px dashed rgba(148, 163, 184, 0.3);
  border-radius: 8px;
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  transition: var(--transition);
}

.knowledge-add-btn:hover {
  border-color: var(--accent-green);
  color: var(--accent-green);
  background: rgba(34, 197, 94, 0.05);
}

/* ============================================
   学情概览 - 知识板块竖向全宽布局 (V2.1.1)
   ============================================ */
.kb-overview-wrap {
  width: 100%;
  margin-top: 16px;
}
.kb-overview-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  padding: 14px 18px;
  background: linear-gradient(135deg, rgba(59,130,246,0.08), rgba(139,92,246,0.08));
  border: 1px solid rgba(99,102,241,0.2);
  border-radius: 10px;
  margin-bottom: 14px;
}
.kb-overview-title h3 {
  margin: 0 0 4px 0;
  font-size: 17px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: 0.3px;
}
.kb-overview-sub {
  font-size: 12px;
  color: var(--text-muted);
}
.kb-overview-sub strong {
  color: var(--accent-blue);
  font-weight: 700;
  font-family: 'Orbitron', monospace;
}
.kb-overview-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
.kb-action-btn {
  padding: 6px 14px;
  font-size: 13px;
  font-weight: 600;
  border: 1px solid rgba(148,163,184,0.3);
  border-radius: 6px;
  background: rgba(255,255,255,0.04);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.18s;
  white-space: nowrap;
}
.kb-action-btn:hover {
  border-color: var(--accent-blue);
  color: var(--accent-blue);
  background: rgba(59,130,246,0.08);
}
.kb-action-btn.primary {
  background: rgba(34,197,94,0.12);
  border-color: rgba(34,197,94,0.4);
  color: #4ade80;
}
.kb-action-btn.primary:hover {
  background: rgba(34,197,94,0.2);
  border-color: #22c55e;
}
.kb-action-btn.danger {
  background: rgba(239,68,68,0.08);
  border-color: rgba(239,68,68,0.3);
  color: #f87171;
}
.kb-action-btn.danger:hover {
  background: rgba(239,68,68,0.18);
  border-color: #ef4444;
}
.kb-empty {
  text-align: center;
  padding: 40px 20px;
  background: rgba(255,255,255,0.02);
  border: 1px dashed rgba(148,163,184,0.25);
  border-radius: 10px;
}
.kb-empty p {
  color: var(--text-muted);
  margin: 0 0 14px 0;
  font-size: 14px;
}
.kb-list-vertical, .knowledge-blocks-list {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.kb-row, .kb-card, .knowledge-card {
  width: 100%;
  border-radius: 12px;
  padding: 18px 20px;
  border: 1px solid rgba(139, 92, 246, 0.2);
  background: rgba(45, 31, 71, 0.75);
  box-shadow: 0 1px 2px rgba(45, 31, 71, 0.3);
  transition: all .15s;
  color: #e9d5ff;
}
.kb-row:hover, .kb-card:hover, .knowledge-card:hover {
  box-shadow: 0 6px 14px rgba(139, 92, 246, 0.25);
  transform: translateY(-1px);
  border-color: rgba(167, 139, 250, 0.4);
  background: rgba(55, 38, 87, 0.85);
}
.kb-row.in-exam {
  border-left: 3px solid rgba(34,197,94,0.5);
}
.kb-row-main {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}
.kb-row-left {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 1;
  min-width: 0;
}
.kb-row-right {
  display: flex;
  align-items: center;
  gap: 12px;
}
.kb-top-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
  margin-bottom: 12px;
}
.kb-block-title {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 1;
  min-width: 0;
}
.kb-block-name {
  font-size: 16px;
  font-weight: 600;
  color: #f5f3ff;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.kb-ability-number {
  font-size: 28px;
  font-weight: 700;
  font-family: 'Orbitron', 'SF Mono', 'Courier New', sans-serif;
  color: #67e8f9;
  min-width: 60px;
  text-align: right;
  line-height: 1.1;
  margin: 0;
  padding: 0;
}
.kb-middle-section {
  width: 100%;
  margin: 8px 0 14px 0;
}
.kb-mastery-label-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 6px;
}
.kb-mastery-tag {
  display: inline-block;
  padding: 2px 10px;
  border-radius: 12px;
  font-size: 11px;
  font-weight: 700;
  white-space: nowrap;
}
.kb-mastery-tag.mastery-weak { background: rgba(239,68,68,0.12); color: #dc2626; border: 1px solid rgba(239,68,68,0.3); }
.kb-mastery-tag.mastery-normal { background: rgba(245,158,11,0.12); color: #d97706; border: 1px solid rgba(245,158,11,0.3); }
.kb-mastery-tag.mastery-mid { background: rgba(245,158,11,0.12); color: #d97706; border: 1px solid rgba(245,158,11,0.3); }
.kb-mastery-tag.mastery-skilled { background: rgba(6,182,212,0.12); color: #0891b2; border: 1px solid rgba(6,182,212,0.3); }
.kb-mastery-tag.mastery-mastered { background: rgba(16,185,129,0.12); color: #059669; border: 1px solid rgba(16,185,129,0.3); }
.kb-mastery-tag.mastery-strong { background: rgba(16,185,129,0.12); color: #059669; border: 1px solid rgba(16,185,129,0.3); }
.kb-mastery-tag.mastery-excellent { background: rgba(139,92,246,0.12); color: #7c3aed; border: 1px solid rgba(139,92,246,0.3); }
.kb-progress-track {
  width: 100%;
  height: 6px;
  background: rgba(148, 163, 184, 0.2);
  border-radius: 3px;
  overflow: hidden;
}
.kb-progress-fill {
  height: 100%;
  background: #3b82f6;
  border-radius: 3px;
  transition: width 0.4s ease;
}
.kb-bottom-actions {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  margin-top: 4px;
  width: 100%;
}
.kb-action-btn-sm {
  padding: 6px 14px;
  border-radius: 6px;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.15s;
  border: 1px solid rgba(148, 163, 184, 0.3);
  background: rgba(30, 41, 59, 0.6);
  color: #cbd5e1;
  box-shadow: none;
}
.kb-action-btn-sm:hover {
  background: rgba(51, 65, 85, 0.8);
  border-color: rgba(148, 163, 184, 0.5);
  color: #f1f5f9;
}
.kb-action-btn-sm.primary {
  background: #3b82f6;
  border-color: #3b82f6;
  color: #fff;
}
.kb-action-btn-sm.primary:hover {
  background: #2563eb;
  border-color: #2563eb;
}
.kb-action-btn-sm.danger {
  background: rgba(30, 41, 59, 0.6);
  border-color: rgba(248, 113, 113, 0.5);
  color: #ef4444;
}
.kb-action-btn-sm.danger:hover {
  background: rgba(239, 68, 68, 0.15);
  border-color: #ef4444;
}
.kb-tag {
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 4px;
  font-weight: 600;
  white-space: nowrap;
}
.kb-tag-exam {
  background: rgba(34,197,94,0.15);
  color: #16a34a;
  border: 1px solid rgba(34,197,94,0.3);
}
.kb-tag-noexam {
  background: rgba(148,163,184,0.12);
  color: #94a3b8;
  border: 1px solid rgba(148,163,184,0.25);
}
.kb-row-name {
  font-size: 15px;
  font-weight: 600;
  color: #f5f3ff;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.kb-row-count {
  font-size: 12px;
  color: #c4b5fd;
  white-space: nowrap;
}
.kb-ability-bar {
  width: 100%;
  height: 6px;
  background: rgba(139, 92, 246, 0.25);
  border-radius: 3px;
  overflow: hidden;
}
.kb-ability-fill {
  height: 100%;
  border-radius: 3px;
  transition: width 0.4s ease;
}
.kb-ability-fill.weak { background: linear-gradient(90deg, #ef4444, #f97316); }
.kb-ability-fill.mid { background: linear-gradient(90deg, #f59e0b, #eab308); }
.kb-ability-fill.strong { background: linear-gradient(90deg, #22c55e, #10b981); }
.kb-ability-num {
  font-size: 14px;
  font-weight: 700;
  font-family: 'Orbitron', monospace;
  min-width: 42px;
  text-align: right;
}
.kb-ability-num.weak { color: #dc2626; }
.kb-ability-num.mid { color: #d97706; }
.kb-ability-num.strong { color: #16a34a; }
.kb-toggle-btn {
  padding: 4px 10px;
  font-size: 12px;
  border: 1px solid rgba(139, 92, 246, 0.4);
  border-radius: 6px;
  background: rgba(88, 28, 135, 0.6);
  color: #e9d5ff;
  cursor: pointer;
  transition: all 0.15s;
  box-shadow: none;
}
.kb-toggle-btn:hover {
  border-color: rgba(167, 139, 250, 0.7);
  color: #f5f3ff;
  background: rgba(139, 92, 246, 0.5);
}
.kb-row-detail {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px dashed rgba(139, 92, 246, 0.3);
}
.kb-row-detail.hidden {
  display: none;
}
.kb-row-questions {
  margin-bottom: 10px;
}
.kb-q-preview {
  display: flex;
  gap: 10px;
  align-items: center;
  padding: 6px 10px;
  margin-bottom: 4px;
  background: #f8fafc;
  border-radius: 6px;
  font-size: 13px;
}
.kb-q-diff {
  font-size: 11px;
  padding: 2px 6px;
  border-radius: 3px;
  background: rgba(59,130,246,0.12);
  color: #2563eb;
  font-weight: 600;
  white-space: nowrap;
}
.kb-q-content {
  color: #475569;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  flex: 1;
}
.kb-q-more {
  font-size: 12px;
  color: #64748b;
  margin: 6px 0 0 0;
  padding-left: 10px;
}
.kb-no-q {
  color: #64748b;
  font-size: 13px;
  margin: 0;
  padding: 8px 0;
}
.kb-row-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

/* ============================================
   Login/Register alignment fixes
   ============================================ */
.auth-submit-row {
  display: flex; flex-direction: column; align-items: center;
  gap: 12px; margin-top: 16px;
}
.auth-submit-row .auth-btn { width: 100%; margin-bottom: 0; }
.auth-switch { margin-top: 4px; }

/* Form element center alignment */
.form-group { display: flex; flex-direction: column; }
.form-group.checkbox-label {
  flex-direction: row; align-items: center; gap: 8px;
  font-size: 12px; color: var(--text-muted);
}

/* Register success toast inline */
.reg-success-inline {
  color: #22c55e; font-size: 0.95rem; text-align: center;
  display: block; padding: 10px 0;
}

/* ============================================
   Plan add form modal
   ============================================ */
.plan-add-form {
  background: var(--card-bg); border: 1px solid var(--border);
  border-radius: 12px; padding: 20px; margin-bottom: 20px;
}
.plan-add-form h4 { margin: 0 0 16px 0; color: var(--text-primary); }

/* ============================================
   Knowledge add form inline
   ============================================ */
.knowledge-add-row {
  display: flex; gap: 8px; align-items: center;
  margin-top: 8px;
}
.knowledge-add-row input {
  flex: 1; padding: 6px 12px; border: 1px solid var(--border);
  border-radius: 8px; background: var(--bg); color: var(--text-primary);
  font-size: 13px;
}
.knowledge-add-row button {
  padding: 6px 14px; border-radius: 8px; border: none;
  background: var(--accent-blue); color: #fff; cursor: pointer;
  font-size: 13px;
}

/* ============================================
   Difficulty Badge System - V3 (Clip-path Diamond)
   ============================================ */

/* --- Badge Container --- */
.diff-badge {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 100px;
  height: 100px;
  flex-shrink: 0;
}

.diff-badge.diff-small {
  width: 68px;
  height: 68px;
}

.diff-badge.diff-large {
  width: 136px;
  height: 136px;
}

/* --- Glow wrapper (rotated 45deg square = diamond shape, box-shadow outlines diamond) --- */
.diff-badge-glow {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 50px;
  height: 50px;
  transform: translate(-50%, -50%) rotate(45deg);
  z-index: 3;
  pointer-events: none;
  background: transparent;
}

.diff-small .diff-badge-glow {
  width: 34px;
  height: 34px;
}

.diff-large .diff-badge-glow {
  width: 67px;
  height: 67px;
}

/* --- Diamond (sharp clip-path, no border-radius) --- */
.diff-badge-diamond {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 70px;
  height: 70px;
  transform: translate(-50%, -50%);
  clip-path: polygon(50% 0%, 100% 50%, 50% 100%, 0% 50%);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 5;
  overflow: hidden;
  background: #22c55e;
}

/* --- Diamond black border (slightly larger, behind diamond) --- */
.diff-badge-border {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 76px;
  height: 76px;
  transform: translate(-50%, -50%);
  clip-path: polygon(50% 0%, 100% 50%, 50% 100%, 0% 50%);
  background: #000;
  z-index: 4;
  pointer-events: none;
}

.diff-small .diff-badge-border {
  width: 54px;
  height: 54px;
}

.diff-large .diff-badge-border {
  width: 100px;
  height: 100px;
}

.diff-small .diff-badge-diamond {
  width: 48px;
  height: 48px;
}

.diff-large .diff-badge-diamond {
  width: 94px;
  height: 94px;
}

/* --- Inner Content (no counter-rotation needed) --- */
.diff-badge-inner {
  position: relative;
  z-index: 2;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  pointer-events: none;
  width: 100%;
  height: 100%;
}

/* --- Value Text (SairaCondensed) --- */
.diff-badge .diff-value {
  font-family: 'Orbitron', 'SF Mono', 'Courier New', 'Microsoft YaHei', sans-serif;
  font-size: 18px;
  font-weight: 900;
  color: #fff;
  line-height: 1;
  text-shadow: 0 1px 3px rgba(0,0,0,0.6);
  letter-spacing: -1px;
}

.diff-small .diff-value {
  font-size: 11px;
  text-shadow: 0 1px 2px rgba(0,0,0,0.5);
  letter-spacing: -0.5px;
}

.diff-large .diff-value {
  font-size: 24px;
  text-shadow: 0 1px 4px rgba(0,0,0,0.7);
  letter-spacing: -1.5px;
}

/* --- Level Label (SairaCondensed) --- */
.diff-badge .diff-level {
  font-family: 'Orbitron', 'SF Mono', 'Courier New', 'Microsoft YaHei', sans-serif;
  font-size: 7px;
  font-weight: 700;
  color: rgba(255,255,255,0.92);
  letter-spacing: 2px;
  margin-top: 1px;
  text-transform: uppercase;
  text-shadow: 0 1px 2px rgba(0,0,0,0.5);
}

.diff-small .diff-level {
  font-size: 5px;
  letter-spacing: 1.2px;
}

.diff-large .diff-level {
  font-size: 9px;
  letter-spacing: 2.5px;
  margin-top: 2px;
}

/* --- Difficulty Level Backgrounds (darker, higher saturation) --- */
.diff-easy .diff-badge-diamond {
  background: linear-gradient(135deg, #34d399 0%, #059669 50%, #065f46 100%);
}

.diff-normal .diff-badge-diamond {
  background: linear-gradient(135deg, #38bdf8 0%, #0284c7 50%, #075985 100%);
}

.diff-hard .diff-badge-diamond {
  background: linear-gradient(135deg, #c084fc 0%, #9333ea 50%, #6b21a8 100%);
}

.diff-master .diff-badge-diamond {
  background: linear-gradient(135deg, #fde047 0%, #eab308 50%, #a16207 100%);
}

.diff-insane .diff-badge-diamond {
  background: linear-gradient(135deg, #f87171 0%, #dc2626 50%, #991b1b 100%);
}

/* BEYOND: rainbow flow is drawn via Canvas (in algorithms-v6.js) to avoid clip-path background animation issues */
.diff-beyond .diff-badge-diamond {
  background: transparent !important;
}
.diff-rainbow-fill {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
  pointer-events: none;
}

/* --- Glow Breathing Animations (box-shadow on .diff-badge-glow) --- */
/* EASY: subtle green glow */
@keyframes diff-glow-easy {
  0%, 100% {
    box-shadow: 0 0 5px 2px rgba(16,185,129,0.3);
  }
  50% {
    box-shadow: 0 0 14px 5px rgba(16,185,129,0.6);
  }
}
@keyframes diff-glow-normal {
  0%, 100% {
    box-shadow: 0 0 6px 2px rgba(59,130,246,0.4);
  }
  50% {
    box-shadow: 0 0 18px 6px rgba(59,130,246,0.75);
  }
}

/* HARD: medium purple glow */
@keyframes diff-glow-hard {
  0%, 100% {
    box-shadow: 0 0 8px 3px rgba(139,92,246,0.45);
  }
  50% {
    box-shadow: 0 0 24px 8px rgba(139,92,246,0.8);
  }
}

/* MASTER: bright gold glow */
@keyframes diff-glow-master {
  0%, 100% {
    box-shadow: 0 0 8px 3px rgba(253,224,71,0.45);
  }
  50% {
    box-shadow: 0 0 24px 8px rgba(234,179,8,0.8);
  }
}

/* INSANE: strong red glow */
@keyframes diff-glow-insane {
  0%, 100% {
    box-shadow: 0 0 10px 4px rgba(239,68,68,0.5);
  }
  50% {
    box-shadow: 0 0 32px 10px rgba(239,68,68,0.85);
  }
}

/* BEYOND: rainbow cycling glow */
@keyframes diff-glow-beyond {
  0%, 100% {
    box-shadow: 0 0 10px 4px rgba(239,68,68,0.5), 0 0 5px 2px rgba(139,92,246,0.3);
  }
  16% {
    box-shadow: 0 0 10px 4px rgba(249,115,22,0.5), 0 0 5px 2px rgba(239,68,68,0.3);
  }
  33% {
    box-shadow: 0 0 10px 4px rgba(234,179,8,0.5), 0 0 5px 2px rgba(249,115,22,0.3);
  }
  50% {
    box-shadow: 0 0 32px 10px rgba(34,197,94,0.85), 0 0 12px 5px rgba(234,179,8,0.5);
  }
  66% {
    box-shadow: 0 0 10px 4px rgba(59,130,246,0.5), 0 0 5px 2px rgba(34,197,94,0.3);
  }
  83% {
    box-shadow: 0 0 10px 4px rgba(139,92,246,0.5), 0 0 5px 2px rgba(59,130,246,0.3);
  }
}

/* --- Apply glow animations to .diff-badge-glow wrapper --- */
.diff-easy   .diff-badge-glow { animation: diff-glow-easy 3.5s ease-in-out infinite; }
.diff-normal .diff-badge-glow { animation: diff-glow-normal 3s ease-in-out infinite; }
.diff-hard   .diff-badge-glow { animation: diff-glow-hard 2.5s ease-in-out infinite; }
.diff-master .diff-badge-glow { animation: diff-glow-master 2.5s ease-in-out infinite; }
.diff-insane .diff-badge-glow { animation: diff-glow-insane 2s ease-in-out infinite; }
/* BEYOND glow is JS-driven for color cycling */
.diff-beyond .diff-badge-glow { animation: none; }

/* --- Stars (6 stars at diamond corners + left/right midpoints) --- */
.diff-stars {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 10;
}

.diff-star {
  position: absolute;
  color: #fff;
  font-size: 16px;
  line-height: 1;
  font-family: serif;
  filter: drop-shadow(0 0 4px rgba(255,255,255,0.9)) drop-shadow(0 0 8px rgba(255,255,255,0.5));
}

.diff-small .diff-star {
  font-size: 11px;
  filter: drop-shadow(0 0 3px rgba(255,255,255,0.85)) drop-shadow(0 0 6px rgba(255,255,255,0.4));
}

.diff-large .diff-star {
  font-size: 22px;
  filter: drop-shadow(0 0 6px rgba(255,255,255,0.95)) drop-shadow(0 0 12px rgba(255,255,255,0.6));
}

@keyframes star-pulse {
  0%, 100% { opacity: 0.4; transform: scale(0.8); }
  50% { opacity: 1; transform: scale(1.15); }
}

.diff-star {
  animation: star-pulse 1.8s ease-in-out infinite;
}

/* --- Dual Canvas Layers for Orbit Particles --- */
.diff-orbit-back {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 160px;
  height: 160px;
  transform: translate(-50%, -50%);
  pointer-events: none;
  z-index: 1;
}

.diff-small .diff-orbit-back {
  width: 104px;
  height: 104px;
}

.diff-large .diff-orbit-back {
  width: 224px;
  height: 224px;
}

.diff-orbit-front {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 160px;
  height: 160px;
  transform: translate(-50%, -50%);
  pointer-events: none;
  z-index: 7;
}

.diff-small .diff-orbit-front {
  width: 104px;
  height: 104px;
}

.diff-large .diff-orbit-front {
  width: 224px;
  height: 224px;
}

/* ============================================
   HISTORY - 分学科表 + 能力变化 (Task 5)
   ============================================ */
.history-subsection-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  margin: 20px 0 10px;
}
.history-subject-table-wrap {
  margin-bottom: 24px;
}
.history-subject-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--bg-card);
  border: 1px solid rgba(148, 163, 184, 0.1);
  border-radius: 8px;
  overflow: hidden;
  font-size: 14px;
  font-family: 'SF Mono', 'Consolas', 'Courier New', 'Microsoft YaHei', sans-serif;
}
.history-subject-table thead {
  background: rgba(15, 23, 42, 0.5);
}
.history-subject-table th {
  padding: 10px 16px;
  text-align: left;
  color: var(--text-secondary);
  font-weight: 600;
  font-size: 13px;
  border-bottom: 1px solid rgba(148, 163, 184, 0.1);
}
.history-subject-table td {
  padding: 10px 16px;
  color: var(--text-primary);
  border-bottom: 1px solid rgba(148, 163, 184, 0.05);
}
.history-subject-table tbody tr:last-child td {
  border-bottom: none;
}
.history-subject-table .no-data-cell {
  text-align: center;
  color: var(--text-muted);
  padding: 24px;
}

.ability-change {
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 12px;
  min-width: 60px;
  text-align: right;
  display: inline-block;
}
.ability-change.change-up {
  color: var(--accent-green);
  background: rgba(34, 197, 94, 0.1);
}
.ability-change.change-down {
  color: var(--accent-red);
  background: rgba(239, 68, 68, 0.1);
}
.ability-change.change-zero {
  color: var(--text-muted);
  background: rgba(100, 116, 139, 0.1);
}

/* V2.1.0: 历史记录发挥度展示 */
.event-performance {
  font-size: 12px;
  padding: 2px 8px;
  border-radius: 4px;
  background: rgba(34, 211, 238, 0.12);
  color: var(--accent-cyan, #22d3ee);
  font-weight: 600;
  white-space: nowrap;
  flex-shrink: 0;
}
.event-performance.overlevel {
  background: rgba(239, 68, 68, 0.15);
  color: var(--accent-red, #ef4444);
}

/* V2.1.0: 学情概览分科稳定性摘要 */
.overview-subject-summary {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 12px;
  margin-bottom: 16px;
}
.oss-card {
  background: rgba(15, 23, 42, 0.6);
  border: 1px solid rgba(148, 163, 184, 0.12);
  border-radius: 8px;
  padding: 12px 14px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.oss-card .oss-name {
  font-size: 13px;
  color: var(--text-secondary);
  font-weight: 600;
}
.oss-card .oss-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
}
.oss-card .oss-label {
  color: var(--text-muted);
}
.oss-card .oss-val {
  color: var(--accent-cyan, #22d3ee);
  font-weight: 700;
  font-family: 'Orbitron', 'Arial Black', sans-serif;
}
.oss-card .oss-val.stability {
  color: var(--accent-purple, #a855f7);
}

/* ============================================
   ENV REF TIP - 环境参考提示 (Task 6)
   ============================================ */
.env-ref-tip {
  background: rgba(251, 146, 60, 0.1);
  border: 1px solid rgba(251, 146, 60, 0.3);
  color: #fbbf24;
  padding: 10px 14px;
  border-radius: 8px;
  font-size: 13px;
  margin-bottom: 12px;
}

/* ============================================
   LEADERBOARD - Top 3 and fixed bottom bar (Task 7)
   ============================================ */
.leader-row.top-1 {
  background: linear-gradient(90deg, rgba(251, 191, 36, 0.15), rgba(245, 158, 11, 0.05));
  border-color: rgba(251, 191, 36, 0.4);
}
.leader-row.top-1 .leader-rank {
  background: linear-gradient(135deg, #fbbf24, #f59e0b);
  color: #1a1a1a;
  border-radius: 50%;
  width: 28px;
  height: 28px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
}
.leader-row.top-2 {
  background: linear-gradient(90deg, rgba(229, 231, 235, 0.12), rgba(156, 163, 175, 0.04));
  border-color: rgba(229, 231, 235, 0.3);
}
.leader-row.top-2 .leader-rank {
  background: linear-gradient(135deg, #e5e7eb, #9ca3af);
  color: #1a1a1a;
  border-radius: 50%;
  width: 28px;
  height: 28px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
}
.leader-row.top-3 {
  background: linear-gradient(90deg, rgba(251, 146, 60, 0.12), rgba(194, 65, 12, 0.04));
  border-color: rgba(251, 146, 60, 0.3);
}
.leader-row.top-3 .leader-rank {
  background: linear-gradient(135deg, #fb923c, #c2410c);
  color: #fff;
  border-radius: 50%;
  width: 28px;
  height: 28px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
}
.leader-me-fixed {
  display: grid;
  grid-template-columns: 60px 1fr 100px 100px;
  gap: 16px;
  padding: 14px 16px;
  background: rgba(59, 130, 246, 0.2);
  border: 2px solid rgba(59, 130, 246, 0.5);
  border-radius: 8px;
  margin-top: 16px;
  align-items: center;
  position: sticky;
  bottom: 0;
  box-shadow: 0 -4px 12px rgba(0, 0, 0, 0.3);
  font-size: 14px;
}
.leader-me-fixed .leader-rank {
  color: var(--accent-blue);
  font-weight: 700;
}
.leader-me-fixed .leader-total {
  color: var(--accent-cyan);
  font-weight: 700;
  text-align: right;
}
@media (max-width: 768px) {
  .leader-me-fixed {
    grid-template-columns: 40px 1fr 80px 80px;
    gap: 8px;
    font-size: 12px;
  }
}

/* ============================================
   Toast Notification System
   ============================================ */
#toast-container {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 999999;
  display: flex;
  flex-direction: column;
  gap: 10px;
  pointer-events: none;
}

.toast {
  min-width: 200px;
  max-width: 360px;
  padding: 12px 18px 12px 14px;
  border-radius: 10px;
  color: #fff;
  font-size: 14px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.3);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  display: flex;
  align-items: center;
  gap: 10px;
  pointer-events: auto;
  transform: translateX(120%);
  opacity: 0;
  transition: all 0.3s cubic-bezier(0.16,1,0.3,1);
}

.toast.show {
  transform: translateX(0);
  opacity: 1;
}

.toast-success { background: rgba(34,197,94,0.95); border: 1px solid #22c55e; }
.toast-error   { background: rgba(239,68,68,0.95); border: 1px solid #ef4444; }
.toast-warning { background: rgba(245,158,11,0.95); border: 1px solid #f59e0b; }
.toast-info    { background: rgba(59,130,246,0.95); border: 1px solid #3b82f6; }

.toast-icon {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: rgba(255,255,255,0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  font-size: 13px;
  flex-shrink: 0;
}

.toast-msg {
  flex: 1;
  line-height: 1.5;
}

.toast-close {
  cursor: pointer;
  opacity: 0.7;
  font-size: 16px;
  flex-shrink: 0;
  background: none;
  border: none;
  color: #fff;
  padding: 0;
  width: 18px;
  height: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.toast-close:hover { opacity: 1; }

@media (max-width: 480px) {
  #toast-container {
    top: 10px;
    right: 10px;
    left: 10px;
  }
  .toast {
    max-width: 100%;
    min-width: auto;
  }
}

/* ============================================
   Admin Tag Styles
   ============================================ */
.admin-tag {
  font-size: 10px;
  padding: 2px 6px;
  background: #f59e0b;
  color: #fff;
  border-radius: 4px;
  margin-left: 6px;
  font-weight: 600;
  display: inline-block;
  vertical-align: middle;
}

.admin-tag-super {
  background: #ef4444;
}

/* ============================================
   Button Loading Animation
   ============================================ */
.btn-loading {
  pointer-events: none;
  opacity: 0.7;
  position: relative;
}

.btn-loading::after {
  content: '';
  position: absolute;
  width: 16px;
  height: 16px;
  top: 50%;
  right: 12px;
  margin-top: -8px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  border-top-color: #fff;
  animation: btn-spin 0.6s linear infinite;
}

@keyframes btn-spin {
  to { transform: rotate(360deg); }
}

.btn-loading span {
  margin-right: 24px;
}

/* ============================================
   USER MANAGEMENT (用户管理 - 仅总管理员)
   ============================================ */
.user-mgmt-toolbar {
  gap: 12px;
  align-items: center;
  flex-wrap: wrap;
  margin-bottom: 18px;
}
.user-mgmt-table-wrap {
  overflow-x: auto;
  border-radius: 8px;
  border: 1px solid rgba(148, 163, 184, 0.12);
}
.user-mgmt-table {
  min-width: 760px;
  table-layout: auto;
}
.user-mgmt-table th,
.user-mgmt-table td {
  white-space: nowrap;
  font-size: 13px;
}
.user-mgmt-table .um-name-cell {
  font-weight: 600;
  color: var(--accent-cyan);
  white-space: normal;
  max-width: 160px;
}
.user-mgmt-table .um-email-cell {
  color: var(--text-secondary);
  max-width: 200px;
  overflow: hidden;
  text-overflow: ellipsis;
}
.user-mgmt-actions {
  display: flex;
  gap: 6px;
}
.user-mgmt-actions .question-btn {
  font-size: 12px;
  border-radius: 6px;
}
.um-auth-row td {
  background: rgba(34, 211, 238, 0.05);
  border-bottom: 1px solid rgba(148, 163, 184, 0.08) !important;
  padding: 12px 16px;
}
.um-auth-panel {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}
.um-auth-label {
  font-size: 13px;
  color: var(--text-secondary);
}
.um-auth-sep {
  display: inline-block;
  width: 1px;
  height: 22px;
  background: rgba(148, 163, 184, 0.25);
  margin: 0 6px;
}
@media (max-width: 640px) {
  .user-mgmt-table { min-width: 620px; }
  .um-auth-panel { gap: 8px; }
}

/* === V2.1.6 知识板块深紫色主题（仅深色模式） === */
html[data-theme="dark"] .kb-row,
html[data-theme="dark"] .kb-card,
html[data-theme="dark"] .knowledge-card,
html[data-theme="dark"] .knowledge-blocks-list > div,
html[data-theme="dark"] #qbank-question-list .knowledge-card {
  background: rgba(45, 31, 71, 0.75) !important;
  border: 1px solid rgba(139, 92, 246, 0.2) !important;
  color: #e9d5ff !important;
  border-radius: 12px !important;
  padding: 14px 16px !important;
  box-shadow: 0 1px 3px rgba(45, 31, 71, 0.4) !important;
  transition: all .15s ease !important;
}

html[data-theme="dark"] .kb-row:hover,
html[data-theme="dark"] .kb-card:hover,
html[data-theme="dark"] .knowledge-card:hover {
  background: rgba(67, 56, 102, 0.85) !important;
  border-color: rgba(167, 139, 250, 0.45) !important;
}

html[data-theme="dark"] .kb-row h4, html[data-theme="dark"] .kb-card h4, html[data-theme="dark"] .knowledge-card h4,
html[data-theme="dark"] .kb-row h3, html[data-theme="dark"] .kb-card h3, html[data-theme="dark"] .knowledge-card h3 {
  color: #c4b5fd !important;
}

html[data-theme="dark"] .kb-row .kb-toggle-btn,
html[data-theme="dark"] .kb-card .kb-toggle-btn,
html[data-theme="dark"] .knowledge-card .kb-toggle-btn {
  background: rgba(139, 92, 246, 0.25) !important;
  color: #e9d5ff !important;
  border: 1px solid rgba(139, 92, 246, 0.4) !important;
}

html[data-theme="dark"] .kb-row .kb-stats,
html[data-theme="dark"] .kb-card .kb-stats,
html[data-theme="dark"] .knowledge-card .kb-stats {
  color: #c4b5fd !important;
}

/* Vocabulary accumulation is rendered by a legacy JS module with inline
   light-theme declarations.  Keep those declarations from leaking into the
   dark workspace. */
html[data-theme="dark"] #page-vocab,
html[data-theme="dark"] #page-vocab #vocab-content {
  color: var(--workspace-text, #f1f5f9) !important;
}
html[data-theme="dark"] #page-vocab #vocab-content input,
html[data-theme="dark"] #page-vocab #vocab-content textarea,
html[data-theme="dark"] #page-vocab #vocab-content select {
  background: #0b0d10 !important;
  background-color: #0b0d10 !important;
  border-color: rgba(148, 163, 184, .28) !important;
  color: #f1f5f9 !important;
}
html[data-theme="dark"] #page-vocab #vocab-content input::placeholder,
html[data-theme="dark"] #page-vocab #vocab-content textarea::placeholder {
  color: #64748b !important;
}
html[data-theme="dark"] #page-vocab #vocab-content > div,
html[data-theme="dark"] #page-vocab #vocab-content [style*="background:#fff"],
html[data-theme="dark"] #page-vocab #vocab-content [style*="background: #fff"],
html[data-theme="dark"] #page-vocab #vocab-content [style*="background:#ffffff"],
html[data-theme="dark"] #page-vocab #vocab-content [style*="background: #ffffff"] {
  background: #15181d !important;
  background-color: #15181d !important;
  background-image: none !important;
  border-color: rgba(148, 163, 184, .22) !important;
  color: #f1f5f9 !important;
}
html[data-theme="dark"] #page-vocab #vocab-content [style*="color:#17324d"],
html[data-theme="dark"] #page-vocab #vocab-content [style*="color: #17324d"],
html[data-theme="dark"] #page-vocab #vocab-content [style*="color:#526986"],
html[data-theme="dark"] #page-vocab #vocab-content [style*="color: #526986"],
html[data-theme="dark"] #page-vocab #vocab-content [style*="color:#1e293b"],
html[data-theme="dark"] #page-vocab #vocab-content [style*="color: #1e293b"] {
  color: #cbd5e1 !important;
}
html[data-theme="dark"] #page-vocab #vocab-content [style*="background:#f1f6ff"],
html[data-theme="dark"] #page-vocab #vocab-content [style*="background: #f1f6ff"] {
  background: #13232a !important;
  border-color: rgba(85, 214, 190, .3) !important;
}
html[data-theme="dark"] #page-vocab #vocab-content [style*="background:#fff"].vocab-book-card,
html[data-theme="dark"] #page-vocab #vocab-content .vocab-book-card {
  background: #15181d !important;
  color: #f1f5f9 !important;
}
html[data-theme="dark"] #page-vocab #vocab-content button[style*="background:#fff"],
html[data-theme="dark"] #page-vocab #vocab-content button[style*="background: #fff"] {
  background: #1e293b !important;
  color: #cbd5e1 !important;
  border-color: rgba(148, 163, 184, .28) !important;
}

/* Practice Center P7_C1 */
.pc-subtitle{color:var(--text-secondary,#6b7280);margin:-.25rem 0 1.25rem;font-size:.95rem;line-height:1.5}
.pc-grid{display:grid;gap:1rem}
.pc-card{padding:1.1rem 1.25rem}
.pc-card-head{margin-bottom:.75rem}
.pc-card-title{margin:0 0 .35rem;font-size:1.1rem;font-weight:600}
.pc-card-desc{margin:0;color:var(--text-secondary,#6b7280);font-size:.9rem;line-height:1.45}
.pc-card-actions{margin-bottom:.75rem}
.pc-practice-entry-panel{display:block;width:100%;border:0;background:transparent;box-shadow:none}
.pc-practice-entry-panel .pc-card-head{margin:0 0 1.1rem;padding:0 0 0 .5rem}
.pc-card-title{display:flex;align-items:center;gap:.45rem}
.pc-card-title-icon{font-size:1.15rem;line-height:1}
.pc-current-subject{display:none;margin-top:.8rem;color:#1d4ed8;font-weight:600}
.pc-current-subject.is-visible{display:block}
.pc-subject-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}
.pc-subject-card{display:grid;grid-template-columns:minmax(0,1fr) auto;grid-template-rows:auto auto;align-items:center;column-gap:.65rem;min-width:0;min-height:68px;padding:.8rem 1rem;border:1px solid var(--border,#e5e7eb);border-radius:14px;background:var(--bg-card,#fff);color:var(--text-primary,#374151);cursor:pointer;font:inherit;text-align:left;transition:border-color .18s ease,background-color .18s ease,color .18s ease,box-shadow .18s ease}
.pc-subject-card strong{font-size:.94rem;font-weight:600;white-space:nowrap}
.pc-subject-card > span:not(.pc-subject-check){grid-column:1;grid-row:2;overflow:hidden;color:#9ca3af;font-size:.72rem;text-overflow:ellipsis;white-space:nowrap}
.pc-subject-card:hover:not(:disabled){border-color:#60a5fa;background:#eff6ff;color:#1d4ed8;box-shadow:0 3px 10px rgba(37,99,235,.1)}
.pc-subject-card:hover:not(:disabled) > span:not(.pc-subject-check){color:#3b82f6}
.pc-subject-card.is-selected{border-color:#3b82f6;background:#eff6ff;color:#1e40af;box-shadow:0 3px 10px rgba(37,99,235,.12)}
.pc-subject-card.is-selected > span:not(.pc-subject-check){color:#2563eb}
.pc-subject-check{display:none;grid-column:2;grid-row:1 / span 2;align-self:center;place-items:center;width:1.35rem;height:1.35rem;border-radius:50%;background:#2563eb;color:#fff;font-size:.8rem;font-weight:700;line-height:1}
.pc-subject-card.is-selected .pc-subject-check{display:grid}
.pc-subject-card:disabled{cursor:wait;opacity:.65}
.pc-upload-card{margin-top:1rem;padding:1rem;border:1px solid var(--border,#e5e7eb);border-radius:14px;background:var(--bg-card,#fff);color:var(--text-primary)}
.pc-upload-head{display:flex;align-items:flex-start;justify-content:space-between;gap:1rem;margin-bottom:.85rem}
.pc-upload-title{margin:0 0 .3rem;font-size:1rem;font-weight:700;color:var(--text-primary,#111827)}
.pc-upload-btn{white-space:nowrap;cursor:pointer}
.pc-upload-input{position:absolute;width:1px;height:1px;opacity:0;pointer-events:none}
.pc-upload-preview{display:grid;gap:.75rem}
.pc-upload-form{display:grid;gap:.75rem}
.pc-upload-row{display:grid;grid-template-columns:1fr 1fr;gap:.75rem}
.pc-upload-options{display:grid;gap:.45rem}
.pc-upload-option-row{display:grid;grid-template-columns:42px minmax(0,1fr);gap:.45rem;align-items:center}
.pc-upload-option-label{font-weight:700;text-align:center;color:var(--accent-blue,#1d4ed8)}
.pc-upload-textarea{min-height:88px;resize:vertical;line-height:1.45}
.pc-upload-actions{display:flex;align-items:center;gap:.6rem;flex-wrap:wrap}
.pc-upload-image-name{font-size:.82rem;color:var(--text-secondary,#6b7280)}
.pc-upload-json-note{font-size:.82rem;color:var(--text-secondary,#6b7280)}
.pc-entry-actions{display:flex;flex-wrap:wrap;gap:.5rem;justify-content:flex-end}
.pc-entry-note{display:flex;flex-wrap:wrap;gap:.5rem;margin-top:.85rem;color:var(--text-secondary,#6b7280);font-size:.8rem}
.pc-entry-note span{display:inline-flex;align-items:center;min-height:1.5rem;padding:0 .55rem;border:1px solid var(--border,#e5e7eb);border-radius:999px;background:var(--surface,#fff)}
.pc-entry-flow{display:flex;flex-wrap:wrap;gap:.5rem;margin:0 0 .8rem}
.pc-entry-step{padding:.28rem .55rem;border-radius:999px;background:#eff6ff;color:#1d4ed8;font-size:.78rem;font-weight:600;line-height:1.3}
.pc-practice-shell{margin-top:.5rem}
.pc-practice-session{width:100%;max-width:1280px;margin:0 auto}
.pc-session-head{display:flex;align-items:center;justify-content:space-between;gap:1.25rem;margin-bottom:.35rem}
.pc-session-head>div:first-child{min-width:0;flex:1}
.pc-session-head .section-title{margin:0;font-size:1.45rem;line-height:1.25}
.pc-session-head .pc-subtitle{margin:.2rem 0 0;font-size:.83rem;line-height:1.35}
.pc-session-actions{display:flex;align-items:center;justify-content:flex-end;flex-wrap:wrap;gap:.5rem;flex-shrink:0}
.pc-session-status{display:flex;flex-wrap:wrap;align-items:center;gap:.35rem;border:0;background:transparent;margin:0 0 .55rem;padding:0}
.pc-session-status span{display:inline-flex;align-items:center;gap:.35rem;padding:.32rem .6rem;color:var(--text-secondary,#6b7280);font-size:.78rem;border:1px solid #dbeafe;border-radius:999px;background:#f8fbff}
.pc-session-status span:last-child{border-right:0}
.pc-session-status b{margin-right:0;color:var(--text-primary,#111827);font-weight:600}
.pc-practice-empty{display:flex;flex-direction:column;align-items:center;gap:.55rem;min-height:270px;justify-content:center;text-align:center;padding:2rem 1rem;border:1px solid #e5e7eb;border-radius:10px;background:#fff}
.pc-empty-icon{display:grid;place-items:center;width:52px;height:52px;border-radius:50%;background:#eff6ff;color:#2563eb;font-size:1.5rem}
.pc-practice-empty-title{font-size:1rem;font-weight:600;color:var(--text-primary,#111827)}
.pc-practice-empty-desc{color:var(--text-secondary,#6b7280);font-size:.9rem;line-height:1.6}
.pc-practice-empty-error{color:#b91c1c;font-size:.82rem}
.pc-empty-actions{display:flex;flex-wrap:wrap;justify-content:center;gap:.6rem;margin-top:.55rem}
.pc-plan-form{display:flex;flex-wrap:wrap;gap:.75rem 1rem;align-items:flex-end;margin-bottom:.6rem}
.pc-field{display:flex;flex-direction:column;gap:.3rem;font-size:.85rem;color:var(--text-secondary,#6b7280);min-width:9rem}
.pc-select,.pc-input{padding:.45rem .6rem;border:1px solid var(--border,#e5e7eb);border-radius:8px;background:var(--bg-input,var(--surface,#fff));color:var(--text-primary);font-size:.95rem;min-width:10rem}
.pc-zpd-hint-static,.pc-zpd-hint{font-size:.8rem;color:var(--text-secondary,#9ca3af);margin:.25rem 0 .75rem}
.pc-results{margin-top:.5rem}
.pc-state{padding:.85rem .9rem;border-radius:10px;font-size:.92rem;line-height:1.45;background:var(--bg-muted,var(--bg-secondary,#f3f4f6));color:var(--text-secondary,#4b5563)}
.pc-state-error{background:color-mix(in srgb, var(--accent-red,#ef4444) 12%, var(--bg-card,#fff));color:var(--accent-red,#b91c1c)}
.pc-state-loading{background:color-mix(in srgb, var(--accent-blue,#3b82f6) 12%, var(--bg-card,#fff));color:var(--accent-blue,#1d4ed8)}
.pc-state-empty{background:color-mix(in srgb, var(--accent-yellow,#f59e0b) 12%, var(--bg-card,#fff));color:var(--accent-yellow,#92400e)}
.pc-q-list{display:flex;flex-direction:column;gap:.6rem}
.pc-practice-progress{margin-bottom:.7rem;padding:.6rem .8rem;border:1px solid #dbeafe;border-radius:10px;background:#fff}
.pc-practice-progress-head{display:flex;align-items:center;justify-content:space-between;gap:.75rem;font-size:.84rem;color:var(--text-primary,#111827)}
.pc-practice-progress-head span{font-weight:700;color:#2563eb;font-variant-numeric:tabular-nums}
.pc-practice-progress-track{height:6px;margin-top:.4rem;border-radius:99px;background:#e5e7eb;overflow:hidden}
.pc-practice-progress-track>div{height:100%;border-radius:inherit;background:#2563eb;transition:width .2s ease}
.pc-question-navigator{margin:0 0 .8rem;padding:.75rem .8rem;border:1px solid #dbeafe;border-radius:10px;background:#fff}
.pc-question-navigator-head{display:flex;align-items:center;justify-content:space-between;gap:.75rem;margin-bottom:.55rem;color:#111827;font-size:.86rem}
.pc-question-navigator-head span{color:#64748b;font-size:.76rem;font-weight:400}
.katex-display{overflow-x:auto;overflow-y:hidden;padding:.2rem 0}
.katex{font-size:1em}
.question-content,.pc-practice-title,.pc-option,.pc-option .option-text,.pc-answer-panel{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,"PingFang SC","Microsoft YaHei",sans-serif}
.question-content .katex,.pc-practice-title .katex,.pc-option .katex,.pc-answer-panel .katex{font-size:1em}
.pc-practice-title,.pc-option > span,.pc-answer-summary strong,.pc-analysis p,.solution-card,.modal-card{white-space:pre-wrap}
.pc-analysis p,.solution-card p,.solution-card li{line-height:1.75}
.pc-question-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(4.35rem,1fr));gap:.45rem}
.pc-question-jump{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:.08rem;min-height:3.1rem;padding:.3rem .2rem;border:1px solid #e5e7eb;border-radius:8px;background:#f8fafc;color:#475467;cursor:pointer;font:inherit;transition:border-color .15s ease,background-color .15s ease,color .15s ease}
.pc-question-jump span{font-size:.9rem;font-weight:700;line-height:1.1}
.pc-question-jump small{font-size:.65rem;line-height:1.1;white-space:nowrap}
.pc-question-jump:hover{border-color:#60a5fa;background:#eff6ff;color:#1d4ed8}
.pc-question-jump.is-current{border-color:#2563eb;background:#dbeafe;color:#1d4ed8;box-shadow:0 0 0 2px rgba(37,99,235,.12)}
.pc-question-jump.is-answered{border-color:#93c5fd;background:#f0f9ff;color:#0369a1}
.pc-question-jump.is-completed{border-color:#86efac;background:#f0fdf4;color:#15803d}
.pc-question-legend{display:flex;flex-wrap:wrap;gap:.65rem;margin-top:.55rem;color:#667085;font-size:.72rem}
.pc-question-legend span{display:inline-flex;align-items:center;gap:.25rem}
.pc-question-legend i{display:inline-block;width:.55rem;height:.55rem;border-radius:50%;background:#e5e7eb}
.pc-question-legend i.is-answered{background:#60a5fa}.pc-question-legend i.is-completed{background:#4ade80}
html[data-theme="dark"] #page-practice-session .pc-question-navigator{border-color:rgba(255,255,255,.1);background:#0c0e11;color:#f4f4f5}
html[data-theme="dark"] #page-practice-session .pc-question-navigator-head{color:#f4f4f5}
html[data-theme="dark"] #page-practice-session .pc-question-navigator-head span,html[data-theme="dark"] #page-practice-session .pc-question-legend{color:#a1a1aa}
html[data-theme="dark"] #page-practice-session .pc-question-jump{border-color:rgba(255,255,255,.12);background:#181a20;color:#d4d4d8}
html[data-theme="dark"] #page-practice-session .pc-question-jump:hover{border-color:#55d6be;background:#1b2928;color:#8aefdc}
html[data-theme="dark"] #page-practice-session .pc-question-jump.is-current{border-color:#55d6be;background:#163b36;color:#8aefdc}
html[data-theme="dark"] #page-practice-session .pc-question-jump.is-answered{border-color:#3b82f6;background:#172554;color:#bfdbfe}
html[data-theme="dark"] #page-practice-session .pc-question-jump.is-completed{border-color:#4ade80;background:#143322;color:#bbf7d0}

/* Practice question navigator: keep the whole panel on the dark surface.
   The final, concrete-shell selectors intentionally outrank legacy card/button
   rules that can otherwise restore a white background in dark mode. */
html[data-theme="dark"] body #main-app:has(#page-practice-session:not(.hidden)) #page-practice-session .pc-question-navigator {
  background: #111318 !important;
  background-color: #111318 !important;
  background-image: none !important;
  border-color: #2a3038 !important;
  color: #f2f4f7 !important;
  box-shadow: none !important;
}
html[data-theme="dark"] body #main-app:has(#page-practice-session:not(.hidden)) #page-practice-session .pc-question-navigator-head,
html[data-theme="dark"] body #main-app:has(#page-practice-session:not(.hidden)) #page-practice-session .pc-question-navigator-head strong {
  color: #f2f4f7 !important;
}
html[data-theme="dark"] body #main-app:has(#page-practice-session:not(.hidden)) #page-practice-session .pc-question-navigator-head span,
html[data-theme="dark"] body #main-app:has(#page-practice-session:not(.hidden)) #page-practice-session .pc-question-legend {
  color: #aeb6c2 !important;
}
html[data-theme="dark"] body #main-app:has(#page-practice-session:not(.hidden)) #page-practice-session .pc-question-jump,
html[data-theme="dark"] body #main-app:has(#page-practice-session:not(.hidden)) #page-practice-session .pc-question-jump span,
html[data-theme="dark"] body #main-app:has(#page-practice-session:not(.hidden)) #page-practice-session .pc-question-jump small {
  color: #d8dee8 !important;
}
html[data-theme="dark"] body #main-app:has(#page-practice-session:not(.hidden)) #page-practice-session .pc-question-jump {
  background: #202d42 !important;
  background-color: #202d42 !important;
  border-color: #34445b !important;
}
html[data-theme="dark"] body #main-app:has(#page-practice-session:not(.hidden)) #page-practice-session .pc-question-jump:hover {
  background: #29405b !important;
  border-color: #6ca8e8 !important;
}
html[data-theme="dark"] body #main-app:has(#page-practice-session:not(.hidden)) #page-practice-session .pc-question-jump.is-current {
  background: #294768 !important;
  border-color: #a9c8f0 !important;
  box-shadow: 0 0 0 2px rgba(169, 200, 240, .2) !important;
}
html[data-theme="dark"] body #main-app:has(#page-practice-session:not(.hidden)) #page-practice-session .pc-question-jump.is-answered {
  background: #263b5c !important;
  border-color: #6ca8e8 !important;
}
html[data-theme="dark"] body #main-app:has(#page-practice-session:not(.hidden)) #page-practice-session .pc-question-jump.is-completed {
  background: #294634 !important;
  border-color: #69d391 !important;
}
html[data-theme="dark"] body #main-app:has(#page-practice-session:not(.hidden)) #page-practice-session .pc-question-jump.is-current span,
html[data-theme="dark"] body #main-app:has(#page-practice-session:not(.hidden)) #page-practice-session .pc-question-jump.is-current small {
  color: #e7f1ff !important;
}
html[data-theme="dark"] body #main-app:has(#page-practice-session:not(.hidden)) #page-practice-session .pc-question-jump.is-answered span,
html[data-theme="dark"] body #main-app:has(#page-practice-session:not(.hidden)) #page-practice-session .pc-question-jump.is-answered small {
  color: #c8e1ff !important;
}
html[data-theme="dark"] body #main-app:has(#page-practice-session:not(.hidden)) #page-practice-session .pc-question-jump.is-completed span,
html[data-theme="dark"] body #main-app:has(#page-practice-session:not(.hidden)) #page-practice-session .pc-question-jump.is-completed small {
  color: #c8f4d5 !important;
}
html[data-theme="dark"] body #main-app:has(#page-practice-session:not(.hidden)) #page-practice-session .pc-question-legend i.is-unanswered {
  background: #687383 !important;
}
html[data-theme="dark"] body #main-app:has(#page-practice-session:not(.hidden)) #page-practice-session .pc-question-legend i.is-answered {
  background: #6ca8e8 !important;
}
html[data-theme="dark"] body #main-app:has(#page-practice-session:not(.hidden)) #page-practice-session .pc-question-legend i.is-completed {
  background: #69d391 !important;
}
.pc-practice-card{padding:1.25rem;border:1px solid var(--border,#e5e7eb);border-radius:10px;background:var(--surface,#fff)}
.pc-practice-head{display:flex;align-items:center;justify-content:space-between;gap:1rem}
.pc-practice-eyebrow{margin-bottom:.35rem;font-size:.78rem;color:var(--text-secondary,#6b7280)}
.pc-practice-title{margin:0 0 20px;font-size:19px;line-height:1.8;font-weight:500;color:#111827}
.pc-question-image-wrap{display:block;margin:16px 0;text-align:center;white-space:normal}
.pc-question-image{display:block;max-width:100%;height:auto;max-height:560px;margin:0 auto;border:1px solid #e5e7eb;border-radius:8px;object-fit:contain;background:#fff}
.pc-question-image-error{display:inline-block;padding:10px 14px;border:1px dashed #f59e0b;border-radius:8px;background:#fffbeb;color:#92400e;font-size:14px}
.pc-practice-meta{margin-top:.7rem}
.pc-practice-meta span{display:inline-flex;align-items:center;padding:.18rem .5rem;border-radius:999px;background:#f3f4f6;color:#64748b;font-size:.76rem}
.pc-practice-meta .pc-question-number{background:#dbeafe;color:#1d4ed8;font-weight:700}
.pc-practice-meta .pc-question-type{background:#f3f4f6;color:#64748b}
.pc-practice-meta .pc-difficulty{background:#fef3c7;color:#92400e}
.pc-practice-meta .pc-knowledge{color:#6b7280}
.pc-options{display:flex;flex-direction:column;gap:12px;margin:0}
.pc-option{display:flex;align-items:center;gap:12px;min-height:56px;padding:12px 18px;border:1px solid #dbe1ea;border-radius:10px;background:#fff;color:#374151;font-size:17px;line-height:1.6;cursor:pointer;transition:border-color .16s ease,background-color .16s ease,box-shadow .16s ease}
.pc-option:hover{border-color:#93c5fd;background:#f8fbff}
.pc-option.is-selected,.pc-option:has(input:checked){border-color:#3b82f6;background:#eff6ff;box-shadow:0 0 0 2px rgba(59,130,246,.1);color:#374151}
.pc-option input{width:1rem;height:1rem;margin:0;padding:0;flex:0 0 auto;appearance:auto;background:transparent;background-image:none;border:0;border-radius:50%;box-shadow:none;outline:none;accent-color:#3b82f6}
.pc-option input:focus{outline:none;box-shadow:none}
.pc-option input:focus-visible{outline:none;outline-offset:0;box-shadow:none}
.pc-option > b{flex:0 0 30px;color:#2563eb;font-weight:500}
.pc-option > span{display:block;min-width:0;flex:1;color:#374151;word-break:normal;overflow-wrap:anywhere;white-space:pre-wrap}
.pc-option > span .katex{white-space:normal}
.pc-option > span .katex-display{max-width:100%;margin:.15rem 0}
.question-content.math,.pc-practice-title.math{font-size:22px;line-height:1.9}
.option-content.math{font-size:20px;line-height:1.8}
.pc-option input[type="checkbox"]{border-radius:4px}
/* Options are labels. Keep their text readable in both themes after the submission re-render. */
html #main-app #page-practice label.pc-option > span{color:#374151 !important}
html #main-app #page-practice label.pc-option > b{color:#2563eb !important}
html #main-app #page-practice label.pc-option.is-selected > span,
html #main-app #page-practice label.pc-option:has(input:checked) > span{color:#1e40af !important}
html #main-app #page-practice label.pc-option.is-selected > b,
html #main-app #page-practice label.pc-option:has(input:checked) > b{color:#1d4ed8 !important}
.pc-answer-text{display:block;width:100%;box-sizing:border-box;margin:1rem 0;padding:.75rem;border:1px solid var(--border,#e5e7eb);border-radius:8px;resize:vertical;font:inherit}
.pc-practice-actions{display:flex;flex-wrap:wrap;gap:.6rem;margin-top:1rem}
.pc-answer-panel{display:flex;flex-direction:column;gap:.8rem;margin-top:1rem;padding:1rem 1.1rem;border:1px solid #e2e8f0;border-radius:10px;background:#f8fafc;color:#111827;line-height:1.6}
.pc-answer-panel.is-correct,.pc-answer-panel.is-wrong{border-left:4px solid #3b82f6;background:#f8fafc}
.pc-answer-panel-head{display:flex;align-items:center;justify-content:space-between}
.pc-answer-kicker{margin-bottom:.08rem;color:#64748b;font-size:.75rem;font-weight:600;letter-spacing:.04em}
.pc-answer-status{color:#111827;font-weight:700}
.pc-answer-summary{display:flex;flex-wrap:wrap;gap:.55rem .75rem}
.pc-answer-row{display:flex;align-items:baseline;gap:.4rem;padding:.4rem .6rem;border-radius:7px;background:#fff;color:#374151;font-size:.9rem}
.pc-answer-label{color:#64748b;font-size:.8rem}
.pc-answer-row strong{color:#111827;font-weight:700}
.pc-answer-row.pc-correct-answer{background:#eff6ff}
.pc-answer-row.pc-correct-answer strong{color:#1e40af}
.pc-analysis{padding-top:.75rem;border-top:1px solid #e2e8f0}
.pc-analysis-title{margin-bottom:.3rem;color:#111827;font-size:.9rem;font-weight:700}
.pc-analysis-source{display:inline-block;margin-left:.35rem;padding:.08rem .4rem;border-radius:999px;background:#e2e8f0;color:#475569;font-size:.7rem;font-weight:600;vertical-align:middle}
.pc-analysis-ai .pc-analysis-source{background:#dbeafe;color:#1e40af}
.pc-analysis-unavailable p,.pc-analysis-unavailable small{color:#64748b}
.pc-analysis p{margin:0;color:#111827;white-space:pre-wrap}
.pc-practice-next-wrap{margin-top:.55rem}
.pc-q-item{display:flex;gap:.75rem;align-items:center;justify-content:space-between;padding:.75rem .85rem;border:1px solid var(--border,#e5e7eb);border-radius:10px;background:var(--surface,#fff)}
.pc-q-main{min-width:0;flex:1}
.pc-q-title{font-size:.95rem;font-weight:500;margin-bottom:.25rem;word-break:break-word}
.pc-q-meta{display:flex;flex-wrap:wrap;gap:.45rem .75rem;font-size:.8rem;color:var(--text-secondary,#6b7280)}
.pc-btn-sm{white-space:nowrap;flex-shrink:0}
.pc-plan-summary{padding:.85rem .9rem;border-radius:10px;border:1px solid var(--border,#e5e7eb);margin-bottom:.75rem;background:var(--surface,#fff)}
.pc-plan-summary-title{font-weight:600;margin-bottom:.35rem}
.pc-plan-summary-row{font-size:.92rem;margin-bottom:.45rem}
.pc-dist{display:flex;flex-wrap:wrap;gap:.5rem 1rem;font-size:.88rem}
.pc-dist-item{color:var(--text-secondary,#4b5563)}
.pc-badge-partial{display:inline-block;margin-left:.35rem;padding:.1rem .45rem;border-radius:999px;font-size:.75rem;background:#fef3c7;color:#92400e}
.pc-plan-table-wrap{overflow-x:auto}
.pc-plan-table{width:100%;border-collapse:collapse;font-size:.9rem}
.pc-plan-table th,.pc-plan-table td{padding:.5rem .55rem;border-bottom:1px solid var(--border,#e5e7eb);text-align:left}
.pc-plan-table th{font-weight:600;color:var(--text-secondary,#6b7280);font-size:.82rem}
.pc-progress{margin:.55rem 0 .65rem}
.pc-progress-head{display:flex;justify-content:space-between;align-items:baseline;gap:.5rem;margin-bottom:.3rem;font-size:.88rem}
.pc-progress-label{font-weight:600;color:var(--text-primary,#111827)}
.pc-progress-pct{color:var(--text-secondary,#6b7280);font-variant-numeric:tabular-nums}
.pc-progress-bar{height:8px;border-radius:999px;background:var(--border,#e5e7eb);overflow:hidden}
.pc-progress-fill{height:100%;border-radius:999px;background:linear-gradient(90deg,#3b82f6,#2563eb);transition:width .25s ease}
.pc-progress-meta{margin-top:.3rem;font-size:.82rem;color:var(--text-secondary,#6b7280)}
.pc-progress-done{color:#047857;font-weight:600}
.pc-badge-status{display:inline-block;margin-left:.35rem;padding:.08rem .4rem;border-radius:999px;font-size:.72rem;font-weight:600;vertical-align:middle}
.pc-status-active{background:#dbeafe;color:#1d4ed8}
.pc-status-completed{background:#d1fae5;color:#047857}
.pc-status-replaced{background:#f3f4f6;color:#6b7280}
.pc-row-done td{color:var(--text-secondary,#6b7280)}
.pc-active-prompt{text-align:left}
.pc-active-prompt-title{font-weight:600;margin-bottom:.35rem}
.pc-active-prompt-meta{font-size:.88rem;color:var(--text-secondary,#6b7280);margin-bottom:.65rem}
.pc-active-prompt-actions{display:flex;flex-wrap:wrap;gap:.5rem}
@media (max-width:640px){
  .pc-practice-entry-panel{grid-template-columns:1fr;gap:1rem}
  .pc-subject-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:.5rem}
  .pc-entry-actions{justify-content:stretch}
  .pc-entry-actions .btn{width:100%}
  .pc-q-item{flex-direction:column;align-items:stretch}
  .pc-btn-sm{width:100%}
  .pc-plan-form{flex-direction:column;align-items:stretch}
  .pc-select,.pc-input{min-width:0;width:100%}
}


/* ========== DAN E1B Challenge UI ========== */
.card{
  background:rgba(30,41,59,.72);
  border:1px solid rgba(148,163,184,.14);
  border-radius:var(--border-radius,12px);
  box-shadow:0 8px 24px rgba(0,0,0,.18);
  color:var(--text-primary,#f1f5f9);
}
.dan-page{max-width:1100px;margin:0 auto}
.dan-page-head{margin-bottom:.35rem}
.dan-subtitle{color:var(--text-secondary,#94a3b8);margin:.25rem 0 1rem;font-size:.95rem;line-height:1.5}
.dan-weekly{
  margin-bottom:.85rem;padding:.75rem .95rem;border-radius:12px;
  background:linear-gradient(135deg,rgba(59,130,246,.14),rgba(139,92,246,.12));
  border:1px solid rgba(59,130,246,.28);color:var(--text-primary,#f1f5f9)
}
.dan-error{
  margin:.75rem 0;padding:.7rem .9rem;border-radius:10px;
  background:rgba(239,68,68,.12);color:#fca5a5;border:1px solid rgba(239,68,68,.28)
}
.dan-warn{margin-top:.75rem;color:var(--accent-yellow,#f59e0b);font-size:.9rem}
.dan-state{padding:1rem;color:var(--text-secondary,#94a3b8)}
.dan-tier-block{margin-bottom:1.35rem}
.dan-tier-title{font-size:1.05rem;margin:0 0 .65rem;color:var(--text-primary,#f1f5f9)}
.dan-level-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:.7rem}
.dan-level-card{
  text-align:left;border:1px solid rgba(148,163,184,.16);border-radius:12px;padding:.8rem;
  background:rgba(15,23,42,.55);color:var(--text-primary,#f1f5f9);cursor:pointer;
  transition:transform .12s ease,box-shadow .12s ease,border-color .12s ease,background .12s ease
}
.dan-level-card.is-unlocked:hover{
  transform:translateY(-1px);box-shadow:0 8px 20px rgba(59,130,246,.18);
  border-color:rgba(96,165,250,.55);background:rgba(30,41,59,.9)
}
.dan-level-card.is-selected{
  border-color:#3b82f6;box-shadow:0 0 0 2px rgba(59,130,246,.28);
  background:linear-gradient(135deg,rgba(59,130,246,.18),rgba(139,92,246,.12))
}
.dan-level-card.is-locked{
  opacity:.42;filter:grayscale(.9);cursor:not-allowed;
  background:rgba(15,23,42,.35);color:var(--text-muted,#64748b);border-color:rgba(100,116,139,.25)
}
.dan-level-card.is-obtained{border-color:rgba(34,197,94,.55)}
.dan-level-name{font-weight:700;margin-bottom:.25rem}
.dan-level-meta{font-size:.78rem;color:var(--text-secondary,#94a3b8);line-height:1.35}
.dan-level-badge{margin-top:.45rem;font-size:.75rem;font-weight:600}
.dan-level-card.is-locked .dan-level-badge{color:var(--text-muted,#64748b)}
.dan-level-card.is-unlocked .dan-level-badge{color:#60a5fa}
.dan-level-card.is-obtained .dan-level-badge{color:#4ade80}
.dan-prep-head{display:flex;align-items:center;gap:.75rem;flex-wrap:wrap;margin-bottom:.85rem}
.dan-prep-title{margin:0;color:var(--text-primary,#f1f5f9)}
.dan-prep-meta{
  display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));
  gap:.45rem .85rem;padding:.95rem;margin-bottom:.85rem;color:var(--text-secondary,#94a3b8)
}
.dan-subject-card{padding:.95rem;margin-bottom:.85rem}
.dan-hint{color:var(--text-secondary,#94a3b8);font-size:.9rem;margin:.25rem 0 .65rem}
.dan-subject-list{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:.45rem}
.dan-subject-row{
  display:grid;grid-template-columns:2rem 1fr auto auto;align-items:center;gap:.5rem;
  padding:.5rem .6rem;border:1px solid rgba(148,163,184,.14);border-radius:10px;
  background:rgba(15,23,42,.45);color:var(--text-primary,#f1f5f9)
}
.dan-subject-idx{font-weight:700;color:var(--text-muted,#64748b)}
.dan-subject-code{font-size:.8rem;color:var(--text-muted,#64748b)}
.dan-subject-actions{display:flex;gap:.25rem}
.dan-prep-actions,.dan-submit-actions,.dan-between-actions,.dan-result-actions{
  display:flex;flex-wrap:wrap;gap:.5rem;margin-top:.85rem
}
.dan-challenge-bar{
  display:flex;flex-wrap:wrap;align-items:center;gap:.65rem;margin-bottom:.85rem;
  padding:.7rem .85rem;border-radius:12px;background:rgba(30,41,59,.55);
  border:1px solid rgba(148,163,184,.12)
}
.dan-progress{font-weight:600;color:var(--text-primary,#f1f5f9)}
.dan-timer{
  margin-left:auto;font-variant-numeric:tabular-nums;font-weight:700;
  color:var(--accent-cyan,#22d3ee);font-size:1.05rem
}
.dan-timer-over{color:var(--accent-red,#ef4444)}
.dan-q-card,.dan-submit-card,.dan-between,.dan-result{padding:1rem 1.05rem;margin-bottom:.85rem}
.dan-q-meta{display:flex;flex-wrap:wrap;gap:.4rem;margin-bottom:.65rem}
.dan-chip{
  display:inline-flex;align-items:center;padding:.15rem .55rem;border-radius:999px;
  background:rgba(59,130,246,.16);color:#93c5fd;font-size:.8rem
}
.dan-chip.muted{background:rgba(100,116,139,.22);color:var(--text-secondary,#94a3b8)}
.dan-chip.ok{background:rgba(34,197,94,.16);color:#4ade80}
.dan-q-stem{font-size:1.05rem;line-height:1.55;white-space:pre-wrap;color:var(--text-primary,#f1f5f9)}
.dan-options{margin:.75rem 0 0;padding-left:1.1rem;color:var(--text-secondary,#94a3b8)}
.dan-opt-key{font-weight:700;margin-right:.25rem;color:#93c5fd}
.dan-aa-label{display:flex;flex-direction:column;gap:.35rem;font-weight:600;color:var(--text-primary,#f1f5f9)}
.dan-aa-input{
  max-width:180px;padding:.5rem .6rem;border-radius:8px;
  border:1px solid rgba(148,163,184,.28);background:var(--bg-input,#0f172a);
  color:var(--text-primary,#f1f5f9)
}
.dan-aa-input:focus{outline:none;border-color:rgba(59,130,246,.7);box-shadow:0 0 0 2px rgba(59,130,246,.2)}
.dan-between-ok{font-size:1.05rem;font-weight:700;color:#4ade80;margin:.35rem 0}
.dan-result.is-pass{border-color:rgba(34,197,94,.55);background:linear-gradient(135deg,rgba(34,197,94,.1),rgba(30,41,59,.72))}
.dan-result.kind-fail_aa,.dan-result.kind-fail,.dan-result.kind-timeout{
  border-color:rgba(239,68,68,.45);background:linear-gradient(135deg,rgba(239,68,68,.1),rgba(30,41,59,.72))
}
.dan-result.kind-exited{border-color:rgba(245,158,11,.45);background:linear-gradient(135deg,rgba(245,158,11,.1),rgba(30,41,59,.72))}
@media (max-width:640px){
  .dan-challenge-bar{flex-direction:column;align-items:stretch}
  .dan-timer{margin-left:0}
  .dan-subject-row{grid-template-columns:2rem 1fr auto;grid-template-rows:auto auto}
  .dan-subject-code{grid-column:2}
}

/* Practice Center final hit-test guard: keep the center and its controls clickable. */
#main-app #page-practice,
#main-app #page-practice * {
  pointer-events: auto !important;
}
#main-app #page-practice :is(button, a, input, select, textarea, [role="button"], [role="tab"], .learning-tab, .learning-tabs) {
  position: relative !important;
  z-index: 2147483647 !important;
}

/* ================================================================
   V4 BLACK WORKSPACE SKIN
   Keep the secondary workspaces visually aligned with the home page.
   Every rule in this block is dark-theme-only; the light theme is
   intentionally left untouched.
   ================================================================ */
html[data-theme="dark"] #main-app {
  --workspace-bg: #08080c;
  --workspace-panel: #121218;
  --workspace-panel-deep: #101015;
  --workspace-panel-hover: #1b1b24;
  --workspace-border: rgba(255, 255, 255, 0.11);
  --workspace-border-soft: rgba(255, 255, 255, 0.07);
  --workspace-text: #f5f5f7;
  --workspace-text-secondary: #a1a1aa;
  --workspace-text-muted: #71717a;
  --workspace-accent: #7567f2;
  --workspace-accent-light: #a99cff;
  background: var(--workspace-bg) !important;
}

html[data-theme="dark"] .app-sidebar {
  background: var(--workspace-bg) !important;
  border-right-color: var(--workspace-border-soft) !important;
}

html[data-theme="dark"] .sidebar-brand,
html[data-theme="dark"] .sidebar-account {
  border-color: var(--workspace-border-soft) !important;
}

html[data-theme="dark"] .sidebar-brand,
html[data-theme="dark"] .nav-item,
html[data-theme="dark"] .theme-toggle,
html[data-theme="dark"] .sidebar-utility-btn,
html[data-theme="dark"] .nav-user {
  color: var(--workspace-text-secondary) !important;
}

html[data-theme="dark"] .nav-item {
  background: #0d0e11 !important;
  border-color: transparent !important;
}

html[data-theme="dark"] .nav-item:hover {
  background: rgba(117, 103, 242, 0.12) !important;
  color: #eeeaff !important;
}

html[data-theme="dark"] .nav-item.active {
  background: linear-gradient(135deg, #6759e5, #8a73ff) !important;
  color: #fff !important;
}

html[data-theme="dark"] .app-main,
html[data-theme="dark"] .page-content {
  background: transparent !important;
  color: var(--workspace-text) !important;
}

html[data-theme="dark"] #page-practice,
html[data-theme="dark"] #page-overview,
html[data-theme="dark"] #page-dan,
html[data-theme="dark"] #page-ai-chat,
html[data-theme="dark"] #page-settings {
  color: var(--workspace-text) !important;
}

html[data-theme="dark"] #page-practice .section-title,
html[data-theme="dark"] #page-overview .section-title,
html[data-theme="dark"] #page-dan .section-title,
html[data-theme="dark"] #page-ai-chat .section-title,
html[data-theme="dark"] #page-settings .section-title,
html[data-theme="dark"] #page-practice h1,
html[data-theme="dark"] #page-practice h2,
html[data-theme="dark"] #page-practice h3,
html[data-theme="dark"] #page-overview h1,
html[data-theme="dark"] #page-overview h2,
html[data-theme="dark"] #page-overview h3,
html[data-theme="dark"] #page-dan h1,
html[data-theme="dark"] #page-dan h2,
html[data-theme="dark"] #page-dan h3,
html[data-theme="dark"] #page-ai-chat h1,
html[data-theme="dark"] #page-ai-chat h2,
html[data-theme="dark"] #page-ai-chat h3,
html[data-theme="dark"] #page-settings h1,
html[data-theme="dark"] #page-settings h2,
html[data-theme="dark"] #page-settings h3 {
  color: var(--workspace-text) !important;
}

html[data-theme="dark"] #page-practice :is(p, small, label, .pc-subtitle, .pc-card-desc, .pc-entry-note, .pc-dist-item, .pc-progress-pct, .pc-progress-meta),
html[data-theme="dark"] #page-overview :is(p, small, label, .analytics-eyebrow, .analytics-subtitle),
html[data-theme="dark"] #page-dan :is(p, small, label, .dan-subtitle, .dan-hint, .dan-state),
html[data-theme="dark"] #page-ai-chat :is(p, small),
html[data-theme="dark"] #page-settings :is(p, small, label, .settings-desc) {
  color: var(--workspace-text-secondary) !important;
}

/* Shared panels and controls */
html[data-theme="dark"] #page-practice .card,
html[data-theme="dark"] #page-practice .pc-card,
html[data-theme="dark"] #page-overview .card,
html[data-theme="dark"] #page-overview .form-card,
html[data-theme="dark"] #page-overview .knowledge-blocks-section,
html[data-theme="dark"] #page-dan .card,
html[data-theme="dark"] #page-settings .settings-section,
html[data-theme="dark"] #page-settings .v48-profile-links,
html[data-theme="dark"] #page-settings .v48-admin-card {
  background: linear-gradient(145deg, var(--workspace-panel), var(--workspace-panel-deep)) !important;
  border: 1px solid var(--workspace-border) !important;
  color: var(--workspace-text) !important;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.18) !important;
}

html[data-theme="dark"] #page-practice :is(input, select, textarea),
html[data-theme="dark"] #page-overview :is(input, select, textarea),
html[data-theme="dark"] #page-dan :is(input, select, textarea),
html[data-theme="dark"] #page-settings :is(input, select, textarea) {
  background: #171c22 !important;
  border-color: var(--workspace-border) !important;
  color: var(--workspace-text) !important;
}

html[data-theme="dark"] #page-practice :is(button, .btn),
html[data-theme="dark"] #page-overview :is(button, .btn),
html[data-theme="dark"] #page-dan :is(button, .btn),
html[data-theme="dark"] #page-settings :is(button, .btn) {
  border-color: var(--workspace-border) !important;
}

html[data-theme="dark"] #page-practice :is(button, .btn):hover,
html[data-theme="dark"] #page-overview :is(button, .btn):hover,
html[data-theme="dark"] #page-dan :is(button, .btn):hover,
html[data-theme="dark"] #page-settings :is(button, .btn):hover {
  border-color: rgba(169, 156, 255, 0.55) !important;
  background-color: var(--workspace-panel-hover) !important;
}

/* Practice center */
/* The practice page is transparent by default. When it is the active page,
   color its full workspace instead of letting the legacy blue dark canvas show through. */
html[data-theme="dark"] #main-app:has(#page-practice:not(.hidden)) .app-workspace,
html[data-theme="dark"] #main-app:has(#page-practice:not(.hidden)) .app-main,
html[data-theme="dark"] #main-app:has(#page-practice:not(.hidden)) #page-practice {
  background: #08080c !important;
}
html[data-theme="dark"] #main-app:has(#page-practice:not(.hidden)) #page-practice {
  min-height: 100vh;
}
/* Practice-only sidebar and panels: remove the legacy blue-grey surfaces while
   retaining teal only as the active-state accent. */
html[data-theme="dark"] #main-app:has(#page-practice:not(.hidden)) .app-sidebar,
html[data-theme="dark"] #main-app:has(#page-practice:not(.hidden)) .sidebar-brand,
html[data-theme="dark"] #main-app:has(#page-practice:not(.hidden)) .sidebar-account {
  background: #08080c !important;
  border-color: var(--workspace-border-soft) !important;
}
html[data-theme="dark"] #main-app:has(#page-practice:not(.hidden)) .nav-item,
html[data-theme="dark"] #main-app:has(#page-practice:not(.hidden)) .theme-toggle,
html[data-theme="dark"] #main-app:has(#page-practice:not(.hidden)) .sidebar-utility-btn {
  background: #101015 !important;
  border-color: var(--workspace-border) !important;
  color: var(--workspace-text-secondary) !important;
}
html[data-theme="dark"] #main-app:has(#page-practice:not(.hidden)) .nav-item:hover,
html[data-theme="dark"] #main-app:has(#page-practice:not(.hidden)) .theme-toggle:hover,
html[data-theme="dark"] #main-app:has(#page-practice:not(.hidden)) .sidebar-utility-btn:hover {
  background: #1b1b22 !important;
  border-color: rgba(77, 216, 189, 0.35) !important;
  color: #e8fffa !important;
}
html[data-theme="dark"] #main-app:has(#page-practice:not(.hidden)) .nav-item.active {
  background: rgba(43, 190, 165, 0.14) !important;
  border-color: rgba(77, 216, 189, 0.45) !important;
  color: #55e0c5 !important;
}
html[data-theme="dark"] #main-app:has(#page-practice:not(.hidden)) .sidebar-account-avatar {
  background: linear-gradient(135deg, #b9dd7e, #55d8c3) !important;
  color: #09221e !important;
}
html[data-theme="dark"] #main-app:has(#page-practice:not(.hidden)) #page-practice :is(.card, .pc-card) {
  background: #101015 !important;
  border-color: var(--workspace-border) !important;
}
html[data-theme="dark"] #page-practice .learning-tabs {
  background: #050607 !important;
  background-color: #050607 !important;
  border-color: var(--workspace-border-soft) !important;
}
html[data-theme="dark"] #page-practice .learning-tabs > *,
html[data-theme="dark"] #page-practice .learning-tab,
html[data-theme="dark"] #page-practice [data-learning-tab] {
  color: var(--workspace-text-secondary) !important;
  background: #050607 !important;
  background-color: #050607 !important;
  background-image: none !important;
  box-shadow: none !important;
}
html[data-theme="dark"] #page-practice .learning-tab:hover,
html[data-theme="dark"] #page-practice .learning-tab:focus,
html[data-theme="dark"] #page-practice .learning-tab:focus-visible,
html[data-theme="dark"] #page-practice .learning-tab.active,
html[data-theme="dark"] #page-practice [data-learning-tab]:hover,
html[data-theme="dark"] #page-practice [data-learning-tab]:focus,
html[data-theme="dark"] #page-practice [data-learning-tab]:focus-visible,
html[data-theme="dark"] #page-practice [data-learning-tab].active {
  background: #050607 !important;
  background-color: #050607 !important;
  background-image: none !important;
  color: #ffffff !important;
}
html[data-theme="dark"] #page-practice .learning-tab.active,
html[data-theme="dark"] #page-practice [data-learning-tab].active {
  box-shadow: inset 0 -2px 0 #55d6be !important;
}
html[data-theme="dark"] #page-practice .pc-subject-card {
  background: #000 !important;
  border-color: var(--workspace-border) !important;
  color: var(--workspace-text) !important;
}
html[data-theme="dark"] #page-practice .pc-subject-card > span:not(.pc-subject-check) {
  color: var(--workspace-text-muted) !important;
}
html[data-theme="dark"] #page-practice .pc-subject-card:hover:not(:disabled),
html[data-theme="dark"] #page-practice .pc-subject-card.is-selected {
  background: rgba(43, 190, 165, 0.14) !important;
  border-color: rgba(77, 216, 189, 0.62) !important;
  color: #e8fffa !important;
  box-shadow: 0 3px 14px rgba(0, 0, 0, 0.22) !important;
}
html[data-theme="dark"] #page-practice .pc-entry-step,
html[data-theme="dark"] #page-practice .pc-entry-note span,
html[data-theme="dark"] #page-practice .pc-session-status span,
html[data-theme="dark"] #page-practice-session .pc-session-status span {
  background: #181a20 !important;
  border-color: var(--workspace-border-soft) !important;
  color: var(--workspace-text-secondary) !important;
}

html[data-theme="dark"] #page-practice-session .pc-session-status b {
  color: var(--workspace-text) !important;
}
html[data-theme="dark"] #page-practice .pc-progress-bar {
  background: #292d33 !important;
}
html[data-theme="dark"] #page-practice .pc-progress-fill {
  background: linear-gradient(90deg, #35bda5, #65e0c9) !important;
}
html[data-theme="dark"] #page-practice .pc-status-active {
  background: rgba(43, 190, 165, 0.16) !important;
  color: #72e5d0 !important;
}/* Learning analytics / knowledge blocks */
html[data-theme="dark"] #page-overview .analytics-eyebrow,
html[data-theme="dark"] #page-overview .analytics-heading .eyebrow {
  color: var(--workspace-accent-light) !important;
}
html[data-theme="dark"] #page-overview :is(.knowledge-block-card, .knowledge-block-card-v2, .kb-row, .kb-card, .knowledge-card) {
  background: rgba(45, 31, 71, 0.75) !important;
  border-color: rgba(139, 92, 246, 0.24) !important;
  color: #e9d5ff !important;
}
html[data-theme="dark"] #page-overview :is(.knowledge-block-card, .knowledge-block-card-v2, .kb-row, .kb-card, .knowledge-card):hover {
  background: rgba(67, 56, 102, 0.85) !important;
  border-color: rgba(167, 139, 250, 0.5) !important;
}
html[data-theme="dark"] #page-overview :is(.knowledge-block-card, .knowledge-block-card-v2, .kb-row, .kb-card, .knowledge-card) :is(h3, h4) {
  color: #c4b5fd !important;
}
html[data-theme="dark"] #page-overview :is(.chart-toggle, .chart-toggle-btn).active {
  background: linear-gradient(135deg, #6759e5, #8a73ff) !important;
}

/* Learning analytics: use the same black workspace treatment as Practice Center. */
html[data-theme="dark"] #main-app #page-overview,
html[data-theme="dark"] #main-app #page-overview .analytics-heading,
html[data-theme="dark"] #main-app #page-overview .analytics-state,
html[data-theme="dark"] #main-app #page-overview #overview-content {
  background: #050607 !important;
  background-image: none !important;
}
html[data-theme="dark"] #main-app #page-overview .overview-subjects,
html[data-theme="dark"] #main-app #page-overview .overview-subjects > *,
html[data-theme="dark"] #main-app #page-overview .subject-btn {
  background: #050607 !important;
  background-color: #050607 !important;
  background-image: none !important;
  color: var(--workspace-text-secondary) !important;
  border-color: var(--workspace-border) !important;
}
html[data-theme="dark"] #main-app #page-overview .overview-subjects .subject-btn:hover,
html[data-theme="dark"] #main-app #page-overview .overview-subjects .subject-btn:focus,
html[data-theme="dark"] #main-app #page-overview .overview-subjects .subject-btn.active {
  background: #050607 !important;
  background-color: #050607 !important;
  color: #ffffff !important;
}
html[data-theme="dark"] #main-app #page-overview .overview-subjects .subject-btn.active {
  box-shadow: inset 0 -2px 0 #55d6be !important;
}
html[data-theme="dark"] #main-app #page-overview :is(.overview-subject-summary, .oss-card, .card, .form-card, .knowledge-blocks-section, .knowledge-block-card, .knowledge-block-card-v2, .kb-row, .kb-card, .knowledge-card) {
  background: #101015 !important;
  background-image: none !important;
  border-color: var(--workspace-border) !important;
  color: var(--workspace-text) !important;
}
html[data-theme="dark"] #main-app #page-overview :is(.knowledge-block-card, .knowledge-block-card-v2, .kb-row, .kb-card, .knowledge-card):hover {
  background: #181a20 !important;
}

/* FINAL LEARNING ANALYTICS DARK SKIN
   The legacy V4 skin colors the shell blue when the overview page is active.
   Scope this override to the actual active page and cover both static and
   dynamically-rendered analytics markup. */
html[data-theme="dark"] #main-app:has(#page-overview:not(.hidden)) .app-sidebar,
html[data-theme="dark"] #main-app:has(#page-overview:not(.hidden)) .sidebar-brand,
html[data-theme="dark"] #main-app:has(#page-overview:not(.hidden)) .app-sidebar .nav-item,
html[data-theme="dark"] #main-app:has(#page-overview:not(.hidden)) .theme-toggle,
html[data-theme="dark"] #main-app:has(#page-overview:not(.hidden)) .sidebar-utility-btn {
  background: #0b0d10 !important;
  background-image: none !important;
  border-color: rgba(255, 255, 255, 0.08) !important;
  color: #aeb5bf !important;
  box-shadow: none !important;
}
html[data-theme="dark"] #main-app:has(#page-overview:not(.hidden)) .app-sidebar .nav-item:hover,
html[data-theme="dark"] #main-app:has(#page-overview:not(.hidden)) .theme-toggle:hover,
html[data-theme="dark"] #main-app:has(#page-overview:not(.hidden)) .sidebar-utility-btn:hover {
  background: #15181d !important;
  color: #ffffff !important;
}
html[data-theme="dark"] #main-app:has(#page-overview:not(.hidden)) .app-sidebar .nav-item.active {
  background: rgba(85, 214, 190, 0.12) !important;
  color: #55d6be !important;
  border-color: rgba(85, 214, 190, 0.35) !important;
  box-shadow: inset 3px 0 #55d6be !important;
}
html[data-theme="dark"] #main-app:has(#page-overview:not(.hidden)) .app-workspace,
html[data-theme="dark"] #main-app:has(#page-overview:not(.hidden)) .app-main,
html[data-theme="dark"] #main-app:has(#page-overview:not(.hidden)) #page-overview,
html[data-theme="dark"] #main-app:has(#page-overview:not(.hidden)) #page-overview > * {
  background: #050607 !important;
  background-image: none !important;
  color: #f5f7fa !important;
}
html[data-theme="dark"] #main-app:has(#page-overview:not(.hidden)) #page-overview .overview-subjects {
  background: #050607 !important;
  border: 0 !important;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08) !important;
  border-radius: 0 !important;
  box-shadow: none !important;
}
html[data-theme="dark"] #main-app:has(#page-overview:not(.hidden)) #page-overview .overview-subjects .subject-btn {
  background: transparent !important;
  background-image: none !important;
  border: 0 !important;
  border-radius: 0 !important;
  color: #9aa1ab !important;
  box-shadow: none !important;
}
html[data-theme="dark"] #main-app:has(#page-overview:not(.hidden)) #page-overview .overview-subjects .subject-btn:hover,
html[data-theme="dark"] #main-app:has(#page-overview:not(.hidden)) #page-overview .overview-subjects .subject-btn.active {
  background: transparent !important;
  color: #ffffff !important;
}
html[data-theme="dark"] #main-app:has(#page-overview:not(.hidden)) #page-overview .overview-subjects .subject-btn.active {
  box-shadow: inset 0 -2px #55d6be !important;
}
html[data-theme="dark"] #main-app:has(#page-overview:not(.hidden)) #overview-content :is(
  .overview-subject-summary,
  .oss-card,
  .knowledge-blocks-section,
  .knowledge-block-card,
  .knowledge-block-card-v2,
  .kb-overview-wrap,
  .kb-overview-header,
  .kb-list-vertical,
  .kb-row,
  .kb-card,
  .knowledge-card,
  .no-data-tip,
  .kb-empty
) {
  background: #101015 !important;
  background-image: none !important;
  border-color: rgba(255, 255, 255, 0.1) !important;
  color: #f5f7fa !important;
  box-shadow: none !important;
}
html[data-theme="dark"] #main-app:has(#page-overview:not(.hidden)) #overview-content :is(
  p, span, small, label, .oss-label, .knowledge-sub, .kb-overview-sub
) {
  color: #9aa1ab !important;
}
html[data-theme="dark"] #main-app:has(#page-overview:not(.hidden)) #overview-content :is(
  h2, h3, h4, strong, .oss-name, .oss-val, .kb-overview-title
) {
  color: #f5f7fa !important;
}

/* Analytics legacy cards: keep the three visible overview blocks black in dark mode. */
html[data-theme="dark"] #main-app:has(#page-overview:not(.hidden)) #overview-content :is(
  .analytics-metrics,
  .analytics-metrics > div,
  .analytics-panel,
  .analytics-panel > .analytics-chart,
  .analytics-panel > .analytics-empty,
  .analytics-panel .analytics-empty
) {
  background: #101015 !important;
  background-image: none !important;
  border-color: rgba(255, 255, 255, 0.1) !important;
  box-shadow: none !important;
}
html[data-theme="dark"] #main-app:has(#page-overview:not(.hidden)) #overview-content :is(
  .analytics-metrics,
  .analytics-panel,
  .analytics-empty
) {
  color: #f5f7fa !important;
}

html[data-theme="dark"] #main-app:has(#page-overview:not(.hidden)) #overview-bottom-bar {
  background: #0b0d10 !important;
  border-color: rgba(255, 255, 255, 0.1) !important;
  box-shadow: none !important;
}

/* Dan challenge */
html[data-theme="dark"] #page-dan .dan-weekly,
html[data-theme="dark"] #page-dan .dan-challenge-bar {
  background: linear-gradient(145deg, #171720, #101015) !important;
  border-color: var(--workspace-border) !important;
}
html[data-theme="dark"] #page-dan .dan-subject-row {
  background: #0f0f15 !important;
  border-color: var(--workspace-border) !important;
}
html[data-theme="dark"] #page-dan :is(.dan-chip, .dan-tier-badge) {
  background: rgba(117, 103, 242, 0.18) !important;
  color: #c4baff !important;
}
html[data-theme="dark"] #page-dan .dan-timer {
  color: #a99cff !important;
}

/* Dan page black workspace: align the rank lobby and challenge flow with the
   black analytics cards without changing status colors or other pages. */
html[data-theme="dark"] #main-app:has(#page-dan:not(.hidden)) .app-workspace,
html[data-theme="dark"] #main-app:has(#page-dan:not(.hidden)) .app-main,
html[data-theme="dark"] #main-app:has(#page-dan:not(.hidden)) #page-dan {
  background: #08080c !important;
}
html[data-theme="dark"] #main-app:has(#page-dan:not(.hidden)) #page-dan {
  min-height: 100vh;

/* Dan page sidebar: use the same integrated black rail as Learning Analytics. */
html[data-theme="dark"] #main-app:has(#page-dan:not(.hidden)) .app-sidebar,
html[data-theme="dark"] #main-app:has(#page-dan:not(.hidden)) .sidebar-brand,
html[data-theme="dark"] #main-app:has(#page-dan:not(.hidden)) .sidebar-account {
  background: #050607 !important;
  border-color: rgba(255, 255, 255, 0.06) !important;
  box-shadow: none !important;
}
html[data-theme="dark"] #main-app:has(#page-dan:not(.hidden)) :is(
  .nav-item,
  .theme-toggle,
  .sidebar-utility-btn
) {
  background: transparent !important;
  border: 1px solid transparent !important;
  color: #8a8f98 !important;
  box-shadow: none !important;
}
html[data-theme="dark"] #main-app:has(#page-dan:not(.hidden)) :is(
  .nav-item:hover,
  .theme-toggle:hover,
  .sidebar-utility-btn:hover
) {
  background: rgba(255, 255, 255, 0.04) !important;
  border-color: transparent !important;
  color: #ffffff !important;
}
html[data-theme="dark"] #main-app:has(#page-dan:not(.hidden)) .nav-item.active {
  background: rgba(85, 214, 190, 0.12) !important;
  border-color: transparent !important;
  border-left: 3px solid #55d6be !important;
  color: #55d6be !important;
}
html[data-theme="dark"] #main-app:has(#page-dan:not(.hidden)) .nav-user {
  color: #8a8f98 !important;
}
}
html[data-theme="dark"] #page-dan :is(
  .dan-overview,
  .dan-overview article,
  .dan-level-card,
  .dan-precheck,
  .dan-prep-meta,
  .dan-subject-card,
  .dan-q-card,
  .dan-submit-card,
  .dan-between,
  .dan-result,
  .dan-challenge-bar,
  .dan-weekly,
  .dan-subject-row,
  .dan-precheck-row
) {
  background: #101015 !important;
  background-image: none !important;
  border-color: rgba(255, 255, 255, 0.1) !important;
  box-shadow: none !important;
}
html[data-theme="dark"] #page-dan :is(
  .dan-level-card,
  .dan-precheck,
  .dan-prep-meta,
  .dan-subject-card,
  .dan-q-card,
  .dan-submit-card,
  .dan-between,
  .dan-result,
  .dan-challenge-bar,
  .dan-weekly,
  .dan-subject-row,
  .dan-precheck-row
) {
  color: #f5f7fa !important;
}
html[data-theme="dark"] #page-dan .dan-level-card.is-unlocked:hover {
  background: #18181f !important;
  border-color: rgba(85, 214, 190, 0.55) !important;
  box-shadow: none !important;
}
html[data-theme="dark"] #page-dan .dan-level-card.is-selected {
  background: #171720 !important;
  border-color: #55d6be !important;
  box-shadow: 0 0 0 2px rgba(85, 214, 190, 0.22) !important;
}
html[data-theme="dark"] #page-dan .dan-level-card.is-locked {
  background: #0b0b0f !important;
  border-color: rgba(255, 255, 255, 0.06) !important;
}
html[data-theme="dark"] #page-dan :is(.dan-level-meta, .dan-subject-code, .dan-hint, .dan-state) {
  color: #a1a1aa !important;
}

/* Practice session black workspace
   Keep the question-solving page visually consistent with the black Practice
   Center reference. The old V4 shell otherwise restores blue-grey surfaces. */
html[data-theme="dark"] #main-app:has(#page-practice:not(.hidden)),
html[data-theme="dark"] #main-app:has(#page-practice-session:not(.hidden)),
html[data-theme="dark"] #main-app:has(#page-practice:not(.hidden)) .app-workspace,
html[data-theme="dark"] #main-app:has(#page-practice-session:not(.hidden)) .app-workspace,
html[data-theme="dark"] #main-app:has(#page-practice:not(.hidden)) .app-main,
html[data-theme="dark"] #main-app:has(#page-practice-session:not(.hidden)) .app-main,
html[data-theme="dark"] #main-app:has(#page-practice:not(.hidden)) #page-practice,
html[data-theme="dark"] #main-app:has(#page-practice-session:not(.hidden)) #page-practice-session {
  background: #050607 !important;
  background-color: #050607 !important;
  background-image: none !important;
}

/* The sidebar is part of the reference composition, not a separate blue card. */
html[data-theme="dark"] #main-app:has(#page-practice:not(.hidden)) .app-sidebar,
html[data-theme="dark"] #main-app:has(#page-practice-session:not(.hidden)) .app-sidebar,
html[data-theme="dark"] #main-app:has(#page-practice:not(.hidden)) .sidebar-brand,
html[data-theme="dark"] #main-app:has(#page-practice-session:not(.hidden)) .sidebar-brand,
html[data-theme="dark"] #main-app:has(#page-practice:not(.hidden)) .sidebar-account,
html[data-theme="dark"] #main-app:has(#page-practice-session:not(.hidden)) .sidebar-account {
  background: #050607 !important;
  background-color: #050607 !important;
  background-image: none !important;
  border-color: rgba(255, 255, 255, 0.06) !important;
  box-shadow: none !important;
}

html[data-theme="dark"] #main-app:has(#page-practice:not(.hidden)) :is(.app-sidebar .nav-item, .theme-toggle, .sidebar-utility-btn),
html[data-theme="dark"] #main-app:has(#page-practice-session:not(.hidden)) :is(.app-sidebar .nav-item, .theme-toggle, .sidebar-utility-btn) {
  background: transparent !important;
  background-color: transparent !important;
  background-image: none !important;
  border-color: transparent !important;
  color: #8a8f98 !important;
  box-shadow: none !important;
  transform: none !important;
}

html[data-theme="dark"] #main-app:has(#page-practice:not(.hidden)) :is(.app-sidebar .nav-item:hover, .theme-toggle:hover, .sidebar-utility-btn:hover),
html[data-theme="dark"] #main-app:has(#page-practice-session:not(.hidden)) :is(.app-sidebar .nav-item:hover, .theme-toggle:hover, .sidebar-utility-btn:hover) {
  background: rgba(255, 255, 255, 0.04) !important;
  background-color: rgba(255, 255, 255, 0.04) !important;
  color: #ffffff !important;
}

html[data-theme="dark"] #main-app:has(#page-practice:not(.hidden)) .app-sidebar .nav-item.active,
html[data-theme="dark"] #main-app:has(#page-practice-session:not(.hidden)) .app-sidebar .nav-item.active {
  background: rgba(85, 214, 190, 0.12) !important;
  background-color: rgba(85, 214, 190, 0.12) !important;
  border-left: 3px solid #55d6be !important;
  color: #55d6be !important;
}

/* Black surfaces for both the entry view and dynamically-rendered question UI. */
html[data-theme="dark"] #main-app:has(#page-practice:not(.hidden)) #page-practice :is(
  .learning-tab-panel,
  .learning-external-mount,
  .pc-practice-card,
  .pc-practice-progress,
  .pc-analysis,
  .pc-state,
  .pc-entry-card,
  .pc-card
),
html[data-theme="dark"] #main-app:has(#page-practice-session:not(.hidden)) #page-practice-session :is(
  .pc-practice-card,
  .pc-practice-progress,
  .pc-analysis,
  .pc-state,
  .pc-card
) {
  background: #101015 !important;
  background-image: none !important;
  border-color: rgba(255, 255, 255, 0.1) !important;
  box-shadow: none !important;
  color: #f5f7fa !important;
}

html[data-theme="dark"] #main-app:has(#page-practice:not(.hidden)) #page-practice .pc-option,
html[data-theme="dark"] #main-app:has(#page-practice-session:not(.hidden)) #page-practice-session .pc-option {
  background: #050607 !important;
  background-image: none !important;
  border-color: rgba(255, 255, 255, 0.1) !important;
  color: #f5f7fa !important;
}

html[data-theme="dark"] #main-app:has(#page-practice:not(.hidden)) #page-practice .pc-option.is-selected,
html[data-theme="dark"] #main-app:has(#page-practice-session:not(.hidden)) #page-practice-session .pc-option.is-selected {
  background: #27384f !important;
  border-color: #55d6be !important;
}
html[data-theme="dark"] #page-dan :is(.dan-overview span, .dan-overview small) {
  color: #a1a1aa !important;
}
html[data-theme="dark"] #page-dan :is(.dan-chip, .dan-tier-badge) {
  background: #1a1a24 !important;
  color: #b8b1ff !important;
}

/* Final Dan palette: charcoal surfaces with mint-green hierarchy. */
html[data-theme="dark"] #main-app:has(#page-dan:not(.hidden)) .app-workspace,
html[data-theme="dark"] #main-app:has(#page-dan:not(.hidden)) .app-main,
html[data-theme="dark"] #main-app:has(#page-dan:not(.hidden)) #page-dan {
  background: #080b0d !important;
  background-image: none !important;
}

html[data-theme="dark"] #page-dan .dan-page {
  color: #f2f5f4 !important;
}

html[data-theme="dark"] #page-dan .dan-subtitle,
html[data-theme="dark"] #page-dan .dan-level-meta,
html[data-theme="dark"] #page-dan .dan-hint,
html[data-theme="dark"] #page-dan .dan-state {
  color: #8e9b99 !important;
}

html[data-theme="dark"] #page-dan .dan-overview {
  display: grid !important;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: .7rem;
  margin-bottom: 1.35rem;
  padding: 0 !important;
  background: transparent !important;
  border: 0 !important;
}

html[data-theme="dark"] #page-dan .dan-overview article {
  min-height: 112px;
  padding: 1rem 1.05rem !important;
  background: #151a1d !important;
  border: 1px solid #3cceb5 !important;
  border-radius: 12px;
  box-shadow: none !important;
}

html[data-theme="dark"] #page-dan .dan-overview article span,
html[data-theme="dark"] #page-dan .dan-overview article small {
  color: #8e9b99 !important;
}

html[data-theme="dark"] #page-dan .dan-overview article strong {
  display: block;
  margin-top: .45rem;
  color: #f2f5f4 !important;
}

html[data-theme="dark"] #page-dan .dan-overview article strong small {
  color: #70e0c9 !important;
  font-weight: 600;
}

html[data-theme="dark"] #page-dan .dan-tier-title {
  color: #f2f5f4 !important;
}

html[data-theme="dark"] #page-dan .dan-tier-block.tier-true .dan-tier-title {
  color: #c8a96b !important;
}

html[data-theme="dark"] #page-dan .dan-level-card {
  background: #151a1d !important;
  background-image: none !important;
  border: 1px solid rgba(142, 155, 153, .16) !important;
  color: #f2f5f4 !important;
  box-shadow: none !important;
}

html[data-theme="dark"] #page-dan .dan-level-card.is-unlocked:hover {
  background: #17312f !important;
  border-color: #3cceb5 !important;
  box-shadow: 0 8px 20px rgba(57, 208, 178, .12) !important;
}

html[data-theme="dark"] #page-dan .dan-level-card.is-selected,
html[data-theme="dark"] #page-dan .dan-level-card.is-unlocked {
  background: #17312f !important;
  border-color: #3cceb5 !important;
  box-shadow: none !important;
}

html[data-theme="dark"] #page-dan .dan-level-card.is-locked {
  opacity: 1 !important;
  filter: none !important;
  background: #17191b !important;
  border-color: rgba(100, 107, 108, .18) !important;
  color: #646b6c !important;
}

html[data-theme="dark"] #page-dan .dan-level-card.is-locked .dan-level-name,
html[data-theme="dark"] #page-dan .dan-level-card.is-locked .dan-level-meta,
html[data-theme="dark"] #page-dan .dan-level-card.is-locked .dan-level-badge {
  color: #646b6c !important;
}

html[data-theme="dark"] #page-dan .dan-level-name {
  color: #f2f5f4 !important;
}

html[data-theme="dark"] #page-dan .dan-level-badge {
  min-height: 1.35rem;
  padding: .15rem .55rem;
  border-radius: 999px;
  background: #20282a !important;
  color: #8e9b99 !important;
}

html[data-theme="dark"] #page-dan .dan-level-card.is-unlocked .dan-level-badge {
  background: #2dd4bf !important;
  color: #062b27 !important;
}

html[data-theme="dark"] #page-dan .dan-level-card.is-obtained .dan-level-badge {
  background: #39d0b2 !important;
  color: #062b27 !important;
}

html[data-theme="dark"] #page-dan :is(
  .dan-prep-meta,
  .dan-subject-card,
  .dan-q-card,
  .dan-submit-card,
  .dan-between,
  .dan-result,
  .dan-challenge-bar
) {
  background: #1b2226 !important;
  background-image: none !important;
}

html[data-theme="dark"] #page-dan .dan-tier-block.tier-true .dan-level-card.is-unlocked,
html[data-theme="dark"] #page-dan .dan-tier-block.tier-true .dan-level-card.is-selected {
  border-color: #c8a96b !important;
}

html[data-theme="dark"] #page-dan .dan-tier-block.tier-true .dan-level-card.is-unlocked .dan-level-badge {
  background: rgba(200, 169, 107, .2) !important;
  color: #c8a96b !important;
}

/* Learning assistant */
html[data-theme="dark"] #page-ai-chat .ai-chat-container,
html[data-theme="dark"] #page-ai-chat .ai-history-panel,
html[data-theme="dark"] #page-ai-chat .ai-input-area {
  background: linear-gradient(145deg, var(--workspace-panel), var(--workspace-panel-deep)) !important;
  border-color: var(--workspace-border) !important;
}
html[data-theme="dark"] #page-ai-chat .ai-messages {
  background: #0b0b10 !important;
}
html[data-theme="dark"] #page-ai-chat .ai-history-list :is(button, .ai-history-item),
html[data-theme="dark"] #page-ai-chat .ai-empty-state {
  color: var(--workspace-text-secondary) !important;
}
html[data-theme="dark"] #page-ai-chat .ai-msg-bot .ai-msg-bubble {
  background: #181820 !important;
  border-color: var(--workspace-border) !important;
  color: #e4e4e7 !important;
}
html[data-theme="dark"] #page-ai-chat .ai-msg-user .ai-msg-bubble {
  background: rgba(103, 89, 229, 0.28) !important;
  color: #f5f3ff !important;
}
html[data-theme="dark"] #page-ai-chat :is(.ai-input, .ai-model-inline) {
  background: #0d0d12 !important;
  border-color: var(--workspace-border) !important;
  color: var(--workspace-text) !important;
}
html[data-theme="dark"] #page-ai-chat .ai-send {
  background: linear-gradient(135deg, #6759e5, #8a73ff) !important;
}

/* My page */
html[data-theme="dark"] #page-settings .v48-page-head > p:last-child,
html[data-theme="dark"] #page-settings .v48-profile-links button {
  color: var(--workspace-text-secondary) !important;
}
html[data-theme="dark"] #page-settings .v48-profile-links button:hover {
  background: rgba(117, 103, 242, 0.14) !important;
  color: #eeeaff !important;
}

/* Final Dan-only dark palette. Scope every override to the explicit dark theme
   so the rank lobby follows the shared light palette when dark mode is off. */
html[data-theme="dark"] #main-app:has(#page-dan:not(.hidden)) #page-dan,
html[data-theme="dark"] #main-app:has(#page-dan:not(.hidden)) .app-workspace,
html[data-theme="dark"] #main-app:has(#page-dan:not(.hidden)) .app-main {
  background: #090c0d !important;
  background-image: none !important;
}

html[data-theme="dark"] #main-app:has(#page-dan:not(.hidden)) #page-dan .dan-page {
  color: #f3f6f5 !important;
}

html[data-theme="dark"] #main-app:has(#page-dan:not(.hidden)) #page-dan .dan-subtitle,
html[data-theme="dark"] #main-app:has(#page-dan:not(.hidden)) #page-dan .dan-level-meta {
  color: #a7b0ae !important;
}

html[data-theme="dark"] #main-app:has(#page-dan:not(.hidden)) #page-dan .dan-overview {
  background: transparent !important;
  border: 0 !important;
}

html[data-theme="dark"] #main-app:has(#page-dan:not(.hidden)) #page-dan .dan-overview article {
  background: #171d1f !important;
  background-image: none !important;
  border: 1px solid #23292b !important;
  box-shadow: none !important;
}

html[data-theme="dark"] #main-app:has(#page-dan:not(.hidden)) #page-dan .dan-overview article span,
html[data-theme="dark"] #main-app:has(#page-dan:not(.hidden)) #page-dan .dan-overview article small {
  color: #a7b0ae !important;
}

html[data-theme="dark"] #main-app:has(#page-dan:not(.hidden)) #page-dan .dan-overview article strong {
  color: #f3f6f5 !important;
}

html[data-theme="dark"] #main-app:has(#page-dan:not(.hidden)) #page-dan .dan-overview article:nth-child(3) strong,
html[data-theme="dark"] #main-app:has(#page-dan:not(.hidden)) #page-dan .dan-overview article:nth-child(3) strong small {
  color: #36cdb0 !important;
}

html[data-theme="dark"] #main-app:has(#page-dan:not(.hidden)) #page-dan .dan-level-card,
html[data-theme="dark"] #main-app:has(#page-dan:not(.hidden)) #page-dan .dan-level-card.is-unlocked,
html[data-theme="dark"] #main-app:has(#page-dan:not(.hidden)) #page-dan .dan-level-card.is-obtained {
  background: #151a1c !important;
  background-image: none !important;
  border: 1px solid #23292b !important;
  color: #f3f6f5 !important;
  box-shadow: none !important;
  filter: none !important;
  opacity: 1 !important;
}

html[data-theme="dark"] #main-app:has(#page-dan:not(.hidden)) #page-dan .dan-level-card.is-locked {
  background: #121617 !important;
  border-color: #23292b !important;
  color: #626b69 !important;
}

html[data-theme="dark"] #main-app:has(#page-dan:not(.hidden)) #page-dan .dan-level-card.is-locked .dan-level-name,
html[data-theme="dark"] #main-app:has(#page-dan:not(.hidden)) #page-dan .dan-level-card.is-locked .dan-level-meta,
html[data-theme="dark"] #main-app:has(#page-dan:not(.hidden)) #page-dan .dan-level-card.is-locked .dan-level-badge {
  color: #626b69 !important;
}

html[data-theme="dark"] #main-app:has(#page-dan:not(.hidden)) #page-dan .dan-level-card.is-available,
html[data-theme="dark"] #main-app:has(#page-dan:not(.hidden)) #page-dan .dan-level-card.is-selected {
  background: #18312d !important;
  border-color: #36cdb0 !important;
  color: #f3f6f5 !important;
}

html[data-theme="dark"] #main-app:has(#page-dan:not(.hidden)) #page-dan .dan-level-card.is-available:hover,
html[data-theme="dark"] #main-app:has(#page-dan:not(.hidden)) #page-dan .dan-level-card.is-selected:hover {
  background: #18312d !important;
  border-color: #36cdb0 !important;
  box-shadow: 0 8px 20px rgba(54, 205, 176, .12) !important;
}

html[data-theme="dark"] #main-app:has(#page-dan:not(.hidden)) #page-dan .dan-level-name {
  color: #f3f6f5 !important;
}

html[data-theme="dark"] #main-app:has(#page-dan:not(.hidden)) #page-dan .dan-level-badge {
  background: #202729 !important;
  color: #a7b0ae !important;
}

html[data-theme="dark"] #main-app:has(#page-dan:not(.hidden)) #page-dan .dan-level-card.is-available .dan-level-badge,
html[data-theme="dark"] #main-app:has(#page-dan:not(.hidden)) #page-dan .dan-level-card.is-obtained .dan-level-badge {
  background: #35d0b4 !important;
  color: #09211d !important;
}

html[data-theme="dark"] #main-app:has(#page-dan:not(.hidden)) #page-dan .dan-tier-block.tier-true .dan-tier-title {
  color: #c7a86b !important;
}

html[data-theme="dark"] #main-app:has(#page-dan:not(.hidden)) #page-dan .dan-tier-block.tier-true .dan-level-card.is-available .dan-level-badge,
html[data-theme="dark"] #main-app:has(#page-dan:not(.hidden)) #page-dan .dan-tier-block.tier-true .dan-level-card.is-obtained .dan-level-badge {
  background: rgba(199, 168, 107, .16) !important;
  color: #c7a86b !important;
}

html[data-theme="dark"] #main-app:has(#page-dan:not(.hidden)) #page-dan :is(
  .dan-prep-meta,
  .dan-subject-card,
  .dan-q-card,
  .dan-submit-card,
  .dan-between,
  .dan-result,
  .dan-challenge-bar
) {
  background: #1b2226 !important;
  background-image: none !important;
  border-color: #23292b !important;
}
html[data-theme="dark"] #page-settings .settings-danger {
  background: rgba(239, 68, 68, 0.07) !important;
  border-color: rgba(248, 113, 113, 0.34) !important;
}

/* Dan challenge light theme: keep the page bright and give each state a clear
   surface hierarchy. This block deliberately excludes the dark theme. */
html:not([data-theme="dark"]) #main-app:has(#page-dan:not(.hidden)) .app-workspace,
html:not([data-theme="dark"]) #main-app:has(#page-dan:not(.hidden)) .app-main,
html:not([data-theme="dark"]) #main-app:has(#page-dan:not(.hidden)) #page-dan {
  background: var(--bg-primary, #f7f8fa) !important;
  background-image: none !important;
}

html:not([data-theme="dark"]) #page-dan .dan-page {
  color: var(--text-primary, #172033) !important;
}

html:not([data-theme="dark"]) #page-dan :is(
  .dan-subtitle,
  .dan-level-meta,
  .dan-hint,
  .dan-state,
  .dan-options,
  .dan-chip.muted
) {
  color: var(--text-secondary, #64748b) !important;
}

html:not([data-theme="dark"]) #page-dan .dan-overview {
  background: transparent !important;
  border: 0 !important;
  box-shadow: none !important;
}

html:not([data-theme="dark"]) #page-dan .dan-overview article {
  background: var(--bg-card, #ffffff) !important;
  border: 1px solid #e2e8f0 !important;
  box-shadow: 0 4px 14px rgba(15, 23, 42, .06) !important;
  color: var(--text-primary, #172033) !important;
}

html:not([data-theme="dark"]) #page-dan .dan-overview article :is(span, small) {
  color: var(--text-secondary, #64748b) !important;
}

html:not([data-theme="dark"]) #page-dan .dan-overview article strong,
html:not([data-theme="dark"]) #page-dan .dan-level-name,
html:not([data-theme="dark"]) #page-dan .dan-tier-title,
html:not([data-theme="dark"]) #page-dan .dan-progress,
html:not([data-theme="dark"]) #page-dan .dan-q-stem,
html:not([data-theme="dark"]) #page-dan .dan-aa-label {
  color: var(--text-primary, #172033) !important;
}

html:not([data-theme="dark"]) #page-dan .dan-level-card {
  background: #ffffff !important;
  background-image: none !important;
  border: 1px solid #e2e8f0 !important;
  box-shadow: 0 3px 10px rgba(15, 23, 42, .05) !important;
  color: var(--text-primary, #172033) !important;
}

html:not([data-theme="dark"]) #page-dan .dan-level-card.is-unlocked:hover {
  background: #f8fbff !important;
  border-color: #93c5fd !important;
  box-shadow: 0 8px 20px rgba(59, 130, 246, .14) !important;
}

html:not([data-theme="dark"]) #page-dan .dan-level-card.is-selected,
html:not([data-theme="dark"]) #page-dan .dan-level-card.is-available {
  background: #eff6ff !important;
  border-color: #3b82f6 !important;
  box-shadow: 0 0 0 2px rgba(59, 130, 246, .14) !important;
}

html:not([data-theme="dark"]) #page-dan .dan-level-card.is-locked {
  background: #f1f5f9 !important;
  border-color: #e2e8f0 !important;
  color: #94a3b8 !important;
  opacity: 1 !important;
  filter: none !important;
}

html:not([data-theme="dark"]) #page-dan .dan-level-card.is-locked :is(.dan-level-name, .dan-level-meta, .dan-level-badge) {
  color: #94a3b8 !important;
}

html:not([data-theme="dark"]) #page-dan .dan-level-card.is-available .dan-level-badge {
  color: #1d4ed8 !important;
}

html:not([data-theme="dark"]) #page-dan .dan-level-card.is-obtained .dan-level-badge,
html:not([data-theme="dark"]) #page-dan .dan-between-ok {
  color: #047857 !important;
}

html:not([data-theme="dark"]) #page-dan :is(
  .dan-precheck,
  .dan-prep-meta,
  .dan-subject-card,
  .dan-q-card,
  .dan-submit-card,
  .dan-between,
  .dan-result,
  .dan-challenge-bar,
  .dan-weekly,
  .dan-subject-row,
  .dan-precheck-row
) {
  background: #ffffff !important;
  background-image: none !important;
  border-color: #e2e8f0 !important;
  box-shadow: 0 4px 14px rgba(15, 23, 42, .06) !important;
  color: var(--text-primary, #172033) !important;
}

html:not([data-theme="dark"]) #page-dan .dan-weekly {
  background: #eff6ff !important;
  border-color: #bfdbfe !important;
}

html:not([data-theme="dark"]) #page-dan .dan-chip {
  background: #dbeafe !important;
  color: #1d4ed8 !important;
}

html:not([data-theme="dark"]) #page-dan .dan-chip.ok {
  background: #d1fae5 !important;
  color: #047857 !important;
}

html:not([data-theme="dark"]) #page-dan .dan-aa-input {
  background: #ffffff !important;
  border-color: #cbd5e1 !important;
  color: var(--text-primary, #172033) !important;
}

html:not([data-theme="dark"]) #page-dan :is(.dan-error, .dan-warn) {
  color: #b45309 !important;
}

html:not([data-theme="dark"]) #page-dan .dan-error {
  background: #fff7ed !important;
  border-color: #fed7aa !important;
}

html:not([data-theme="dark"]) #page-dan .dan-result.is-pass {
  background: #ecfdf5 !important;
  border-color: #86efac !important;
}

html:not([data-theme="dark"]) #page-dan :is(.dan-result.kind-fail_aa, .dan-result.kind-fail, .dan-result.kind-timeout) {
  background: #fef2f2 !important;
  border-color: #fecaca !important;
}

/* My page: remove the remaining blue-grey surfaces from the shell and the
   dynamically rendered account/subject settings. Keep teal as the active
   navigation accent and red for destructive actions. */
html[data-theme="dark"] #main-app:has(#page-settings:not(.hidden)) .app-workspace,
html[data-theme="dark"] #main-app:has(#page-settings:not(.hidden)) .app-main,
html[data-theme="dark"] #main-app:has(#page-settings:not(.hidden)) #page-settings {
  background: #050607 !important;
  background-image: none !important;
}

html[data-theme="dark"] #main-app:has(#page-settings:not(.hidden)) .app-sidebar,
html[data-theme="dark"] #main-app:has(#page-settings:not(.hidden)) .sidebar-brand,
html[data-theme="dark"] #main-app:has(#page-settings:not(.hidden)) .sidebar-account {
  background: #050607 !important;
  background-image: none !important;
  border-color: var(--workspace-border-soft) !important;
}

html[data-theme="dark"] #main-app:has(#page-settings:not(.hidden)) :is(.nav-item, .theme-toggle, .sidebar-utility-btn) {
  background: #0b0d10 !important;
  background-image: none !important;
  border: 1px solid var(--workspace-border) !important;
  color: var(--workspace-text-secondary) !important;
  box-shadow: none !important;
}

html[data-theme="dark"] #main-app:has(#page-settings:not(.hidden)) :is(.nav-item:hover, .theme-toggle:hover, .sidebar-utility-btn:hover) {
  background: #15181d !important;
  color: #ffffff !important;
}

html[data-theme="dark"] #main-app:has(#page-settings:not(.hidden)) .nav-item.active {
  background: rgba(43, 190, 165, 0.14) !important;
  border-color: rgba(77, 216, 189, 0.45) !important;
  color: #55e0c5 !important;
}

html[data-theme="dark"] #main-app:has(#page-settings:not(.hidden)) .sidebar-account-avatar {
  background: linear-gradient(135deg, #b9dd7e, #55d8c3) !important;
  color: #09221e !important;
}

html[data-theme="dark"] #page-settings :is(.form-card, .settings-section, .v48-profile-links, .v48-admin-card),
html[data-theme="dark"] #page-settings #settings-subjects > * {
  background: #0b0d10 !important;
  background-image: none !important;
  border-color: var(--workspace-border) !important;
  color: var(--workspace-text) !important;
  box-shadow: none !important;
}

html[data-theme="dark"] #page-settings #settings-subjects > * {
  border-radius: 12px !important;
}

html[data-theme="dark"] #page-settings :is(.form-row, .form-group) {
  background: transparent !important;
}

html[data-theme="dark"] #page-settings :is(.form-input, .form-select, .settings-max-score, .settings-target-rank, input, select, textarea) {
  background: #101214 !important;
  background-image: none !important;
  border-color: var(--workspace-border) !important;
  color: var(--workspace-text) !important;
  box-shadow: none !important;
}

html[data-theme="dark"] #page-settings :is(.form-input, .form-select, .settings-max-score, .settings-target-rank)::placeholder {
  color: var(--workspace-text-muted) !important;
}

/* FINAL PRACTICE BLACK THEME
   This is intentionally the last block in V6 so legacy and dynamically
   injected practice styles cannot restore blue-grey surfaces. */
html[data-theme="dark"] body #main-app:has(#page-practice:not(.hidden)) > .app-sidebar,
html[data-theme="dark"] body #main-app:has(#page-practice:not(.hidden)) > .app-sidebar > :is(.sidebar-brand, .sidebar-account),
html[data-theme="dark"] body #main-app:has(#page-practice-session:not(.hidden)) > .app-sidebar,
html[data-theme="dark"] body #main-app:has(#page-practice-session:not(.hidden)) > .app-sidebar > :is(.sidebar-brand, .sidebar-account),
html[data-theme="dark"] body #main-app:has(#page-practice:not(.hidden)) > .app-workspace,
html[data-theme="dark"] body #main-app:has(#page-practice:not(.hidden)) > .app-workspace > .app-main,
html[data-theme="dark"] body #main-app:has(#page-practice-session:not(.hidden)) > .app-workspace,
html[data-theme="dark"] body #main-app:has(#page-practice-session:not(.hidden)) > .app-workspace > .app-main,
html[data-theme="dark"] body #main-app:has(#page-practice:not(.hidden)) #page-practice,
html[data-theme="dark"] body #main-app:has(#page-practice-session:not(.hidden)) #page-practice-session {
  background: #050607 !important;
  background-color: #050607 !important;
  background-image: none !important;
  border-color: rgba(255, 255, 255, 0.07) !important;
  box-shadow: none !important;
}

html[data-theme="dark"] body #main-app:has(#page-practice:not(.hidden)) > .app-sidebar :is(.nav-item, .theme-toggle, .sidebar-utility-btn),
html[data-theme="dark"] body #main-app:has(#page-practice-session:not(.hidden)) > .app-sidebar :is(.nav-item, .theme-toggle, .sidebar-utility-btn) {
  background: transparent !important;
  background-color: transparent !important;
  background-image: none !important;
  border-color: transparent !important;
  color: #8a8f98 !important;
  box-shadow: none !important;
}

html[data-theme="dark"] body #main-app:has(#page-practice:not(.hidden)) > .app-sidebar .nav-item.active,
html[data-theme="dark"] body #main-app:has(#page-practice-session:not(.hidden)) > .app-sidebar .nav-item.active {
  background: rgba(85, 214, 190, 0.12) !important;
  background-color: rgba(85, 214, 190, 0.12) !important;
  border-left: 3px solid #55d6be !important;
  color: #55d6be !important;
}

html[data-theme="dark"] body #main-app:has(#page-practice:not(.hidden)) #page-practice :is(
  .pc-practice-entry-panel,
  .pc-practice-progress,
  .pc-practice-card,
  .pc-answer-panel,
  .pc-analysis,
  .pc-state,
  .pc-card,
  .pc-subject-card,
  #pc-subject-grid > *
),
html[data-theme="dark"] body #main-app:has(#page-practice-session:not(.hidden)) #page-practice-session :is(
  .pc-practice-progress,
  .pc-practice-card,
  .pc-answer-panel,
  .pc-analysis,
  .pc-state,
  .pc-card
) {
  background: #101015 !important;
  background-color: #101015 !important;
  background-image: none !important;
  border-color: rgba(255, 255, 255, 0.1) !important;
  box-shadow: none !important;
  color: #f5f7fa !important;
}

/* The entry panel is only a layout wrapper inside the outer card. Do not let
   legacy card rules render a second visible panel around the subject grid. */
html #main-app #page-practice .pc-practice-entry-panel {
  border: 0 !important;
  background: transparent !important;
  background-image: none !important;
  box-shadow: none !important;
}

html[data-theme="dark"] body #main-app:has(#page-practice:not(.hidden)) #page-practice :is(.pc-option, .pc-answer-text),
html[data-theme="dark"] body #main-app:has(#page-practice-session:not(.hidden)) #page-practice-session :is(.pc-option, .pc-answer-text) {
  background: #050607 !important;
  background-color: #050607 !important;
  background-image: none !important;
  border-color: rgba(255, 255, 255, 0.1) !important;
  color: #f5f7fa !important;
}

html[data-theme="dark"] body #main-app:has(#page-practice:not(.hidden)) #page-practice .pc-option.is-selected,
html[data-theme="dark"] body #main-app:has(#page-practice-session:not(.hidden)) #page-practice-session .pc-option.is-selected {
  background: #27384f !important;
  background-color: #27384f !important;
  border-color: #55d6be !important;
}

html[data-theme="dark"] body #main-app:has(#page-practice:not(.hidden)) #page-practice :is(.pc-practice-title, .pc-practice-head, .pc-practice-meta, .pc-answer-panel-head, .pc-answer-summary, .pc-analysis-title, .pc-practice-empty-title),
html[data-theme="dark"] body #main-app:has(#page-practice-session:not(.hidden)) #page-practice-session :is(.pc-practice-title, .pc-practice-head, .pc-practice-meta, .pc-answer-panel-head, .pc-answer-summary, .pc-analysis-title) {
  color: #f5f7fa !important;
}

html[data-theme="dark"] body #main-app:has(#page-practice:not(.hidden)) #page-practice :is(.pc-practice-eyebrow, .pc-answer-kicker, .pc-question-number, .pc-question-type, .pc-difficulty, .pc-knowledge, .pc-practice-progress-head span),
html[data-theme="dark"] body #main-app:has(#page-practice-session:not(.hidden)) #page-practice-session :is(.pc-practice-eyebrow, .pc-answer-kicker, .pc-question-number, .pc-question-type, .pc-difficulty, .pc-knowledge, .pc-practice-progress-head span) {
  color: #55d6be !important;
}

html[data-theme="dark"] #page-settings :is(.form-label, .form-group label, #settings-subjects span) {
  color: var(--workspace-text-secondary) !important;
}

html[data-theme="dark"] #page-settings #btn-save-settings {
  background: #0f766e !important;
  border-color: #2bbfa5 !important;
  color: #ffffff !important;
}

html[data-theme="dark"] #page-settings #btn-save-settings:hover {
  background: #159f8c !important;
}

html[data-theme="dark"] #page-settings .settings-danger,
html[data-theme="dark"] #page-settings .settings-danger > * {
  background-color: rgba(239, 68, 68, 0.07) !important;
}

html[data-theme="dark"] #page-settings .settings-danger :is(h3, .btn-danger) {
  color: #f87171 !important;
}

html[data-theme="dark"] #page-settings .settings-danger .btn-danger {
  background: rgba(239, 68, 68, 0.15) !important;
  border-color: rgba(248, 113, 113, 0.42) !important;
}

/* My page: use neutral graphite surfaces instead of the blue-grey legacy
   palette. Teal remains reserved for selection and primary actions. */
html[data-theme="dark"] #main-app:has(#page-settings:not(.hidden)) .app-workspace,
html[data-theme="dark"] #main-app:has(#page-settings:not(.hidden)) .app-main,
html[data-theme="dark"] #main-app:has(#page-settings:not(.hidden)) #page-settings {
  background: #050607 !important;
  background-image: none !important;
}

html[data-theme="dark"] #main-app:has(#page-settings:not(.hidden)) #page-settings :is(
  .settings-section,
  .v48-profile-links,
  .v48-admin-card
) {
  background: #0b0d10 !important;
  background-image: none !important;
  border-color: rgba(255, 255, 255, 0.08) !important;
  box-shadow: none !important;
}

html[data-theme="dark"] #main-app:has(#page-settings:not(.hidden)) #page-settings :is(
  input:not([type="checkbox"]),
  select,
  textarea,
  .form-input,
  .form-select
) {
  background: #15191e !important;
  background-image: none !important;
  border-color: rgba(255, 255, 255, 0.12) !important;
  color: #f5f7fa !important;
  box-shadow: none !important;
}

html[data-theme="dark"] #main-app:has(#page-settings:not(.hidden)) #page-settings :is(
  input:not([type="checkbox"]),
  select,
  textarea,
  .form-input,
  .form-select
):focus {
  border-color: rgba(85, 214, 190, 0.7) !important;
  box-shadow: 0 0 0 3px rgba(85, 214, 190, 0.12) !important;
}

html[data-theme="dark"] #main-app:has(#page-settings:not(.hidden)) #page-settings :is(
  .subject-checkbox,
  .form-label,
  .form-group label
) {
  color: #b4bac3 !important;
}

html[data-theme="dark"] #main-app:has(#page-settings:not(.hidden)) #page-settings :is(
  .subject-checkbox input,
  input[type="checkbox"]
) {
  accent-color: #55d6be !important;
}

html[data-theme="dark"] #main-app:has(#page-settings:not(.hidden)) #page-settings :is(
  .btn-secondary,
  .v48-profile-links button,
  .v48-profile-links a
) {
  background: #15191e !important;
  border-color: rgba(255, 255, 255, 0.12) !important;
  color: #d7dbe1 !important;
}

html[data-theme="dark"] #main-app:has(#page-settings:not(.hidden)) #page-settings :is(
  .btn-secondary:hover,
  .v48-profile-links button:hover,
  .v48-profile-links a:hover
) {
  background: #1c2228 !important;
  border-color: rgba(85, 214, 190, 0.45) !important;
  color: #e8fffa !important;
}

html[data-theme="dark"] #main-app:has(#page-settings:not(.hidden)) .nav-item.active {
  background: rgba(85, 214, 190, 0.12) !important;
  border-color: transparent !important;
  border-left: 3px solid #55d6be !important;
  color: #55d6be !important;
}

/* My page: remove the remaining blue-gray surfaces and frames. */
html[data-theme="dark"] #main-app:has(#page-settings:not(.hidden)) #page-settings :is(
  .settings-section,
  #settings-content,
  .v48-profile-links,
  .subject-card,
  .subject-checkbox,
  .subject-item,
  .settings-section > div
) {
  background: #0b0d10 !important;
  background-image: none !important;
  border-color: rgba(255, 255, 255, 0.10) !important;
  box-shadow: none !important;
}

html[data-theme="dark"] #main-app:has(#page-settings:not(.hidden)) #page-settings :is(
  .subject-card,
  .subject-checkbox,
  .subject-item
) {
  background: #111418 !important;
  border: 1px solid rgba(255, 255, 255, 0.10) !important;
}

html[data-theme="dark"] #main-app:has(#page-settings:not(.hidden)) #page-settings :is(
  input:not([type="checkbox"]),
  select,
  textarea,
  button,
  .btn,
  .subject-maxscore
) {
  background: #15191e !important;
  background-image: none !important;
  border-color: rgba(255, 255, 255, 0.12) !important;
  box-shadow: none !important;
}

html[data-theme="dark"] #main-app:has(#page-settings:not(.hidden)) #page-settings :is(
  input:not([type="checkbox"]),
  select,
  textarea,
  .subject-maxscore
):focus {
  border-color: rgba(85, 214, 190, 0.70) !important;
  outline: none !important;
  box-shadow: 0 0 0 2px rgba(85, 214, 190, 0.14) !important;
}

html[data-theme="dark"] #main-app:has(#page-settings:not(.hidden)) #page-settings :is(
  .settings-section h3,
  .settings-desc,
  .subject-checkbox,
  .form-label,
  .form-group label
) {
  color: #c5cad1 !important;
}

/* Home sidebar: match the practice center's dark control treatment. */
html[data-theme="dark"] #main-app:has(#page-dashboard:not(.hidden)) .sidebar-account {
  background: #08080c !important;
  border-color: var(--workspace-border-soft) !important;
}
html[data-theme="dark"] #main-app:has(#page-dashboard:not(.hidden)) .nav-item {
  background: #101015 !important;
  border: 1px solid var(--workspace-border) !important;
  color: var(--workspace-text-secondary) !important;
}
html[data-theme="dark"] #main-app:has(#page-dashboard:not(.hidden)) .nav-item:hover {
  background: #1b1b22 !important;
  border-color: rgba(77, 216, 189, 0.35) !important;
  color: #e8fffa !important;
}
html[data-theme="dark"] #main-app:has(#page-dashboard:not(.hidden)) .nav-item.active {
  background: rgba(43, 190, 165, 0.14) !important;
  border-color: rgba(77, 216, 189, 0.45) !important;
  color: #55e0c5 !important;
}
html[data-theme="dark"] #main-app:has(#page-dashboard:not(.hidden)) :is(.theme-toggle, .sidebar-utility-btn) {
  background: #101015 !important;
  border: 1px solid var(--workspace-border) !important;
  color: var(--workspace-text-secondary) !important;
}
html[data-theme="dark"] #main-app:has(#page-dashboard:not(.hidden)) :is(.theme-toggle, .sidebar-utility-btn):hover {
  background: #1b1b22 !important;
  border-color: rgba(77, 216, 189, 0.35) !important;
  color: #e8fffa !important;
}

/* =========================================================
   Dark minimal AI product skin
   Keep the workspace nearly black; teal is reserved for focus
   and active states. This is intentionally last so it wins over
   the older blue-grey dark-mode patches above.
   ========================================================= */
:root[data-theme="dark"] {
  --bg-primary: #050607;
  --bg-secondary: #0b0d10;
  --bg-card: #0b0d10;
  --bg-input: #101214;
  --text-primary: #ffffff;
  --text-secondary: #8a8f98;
  --text-muted: #69707a;
  --accent-cyan: #55d6be;
  --accent-blue: #55d6be;
  --workspace-bg: #050607;
  --workspace-panel: #0b0d10;
  --workspace-panel-deep: #0b0d10;
  --workspace-panel-hover: rgba(255, 255, 255, 0.04);
  --workspace-border: rgba(255, 255, 255, 0.06);
  --workspace-border-soft: rgba(255, 255, 255, 0.04);
  --workspace-text: #ffffff;
  --workspace-text-secondary: #8a8f98;
  --workspace-text-muted: #69707a;
}

:root[data-theme="dark"] body,
:root[data-theme="dark"] #main-app,
:root[data-theme="dark"] .app-workspace,
:root[data-theme="dark"] .app-main {
  background: #050607 !important;
  color: #ffffff;
}

/* Sidebar: integrated rail, not a stack of buttons. */
:root[data-theme="dark"] .app-sidebar,
:root[data-theme="dark"] .sidebar-brand,
:root[data-theme="dark"] .sidebar-account {
  background: #050607 !important;
  border-color: rgba(255, 255, 255, 0.06) !important;
  box-shadow: none !important;
}
:root[data-theme="dark"] .nav-item,
:root[data-theme="dark"] .theme-toggle,
:root[data-theme="dark"] .sidebar-utility-btn {
  background: transparent !important;
  border: 1px solid transparent !important;
  color: #8a8f98 !important;
  box-shadow: none !important;
}
:root[data-theme="dark"] .nav-item:hover,
:root[data-theme="dark"] .theme-toggle:hover,
:root[data-theme="dark"] .sidebar-utility-btn:hover {
  background: rgba(255, 255, 255, 0.04) !important;
  border-color: transparent !important;
  color: #ffffff !important;
}
:root[data-theme="dark"] .nav-item.active {
  background: rgba(85, 214, 190, 0.12) !important;
  border-color: transparent !important;
  border-left: 3px solid #55d6be !important;
  color: #55d6be !important;
}
:root[data-theme="dark"] .sidebar-logout {
  color: #8a8f98 !important;
  background: transparent !important;
  border-color: transparent !important;
}

/* Dashboard welcome area is a header with one quiet divider. */
:root[data-theme="dark"] #page-dashboard .home-heading {
  background: transparent !important;
  border: 0 !important;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06) !important;
  border-radius: 0 !important;
  box-shadow: none !important;
}
:root[data-theme="dark"] #page-dashboard .home-heading h1,
:root[data-theme="dark"] #page-dashboard .home-heading .eyebrow {
  color: #ffffff !important;
}
:root[data-theme="dark"] #page-dashboard .home-heading p:not(.eyebrow) {
  color: #8a8f98 !important;
}

/* Dashboard metric strip: low-contrast primary containers. */
:root[data-theme="dark"] #page-dashboard .home-metric-card {
  background: #0b0d10 !important;
  border: 1px solid rgba(255, 255, 255, 0.06) !important;
  box-shadow: none !important;
}
:root[data-theme="dark"] #page-dashboard .home-metric-card strong {
  color: #ffffff !important;
}
:root[data-theme="dark"] #page-dashboard .home-metric-card > span,
:root[data-theme="dark"] #page-dashboard .home-metric-card small {
  color: #9ca3af !important;
}

/* Light dashboard metrics: separate the four statistics into individual cards. */
:root:not([data-theme="dark"]) #page-dashboard .home-metric-grid {
  gap: 18px !important;
  background: transparent !important;
  background-image: none !important;
  border: 0 !important;
  border-radius: 0 !important;
  box-shadow: none !important;
  padding: 0 !important;
}

:root:not([data-theme="dark"]) #page-dashboard .home-metric-card {
  border: 1px solid #e2e8f0 !important;
  border-radius: 20px !important;
  box-shadow: 0 10px 24px rgba(30, 41, 59, 0.08) !important;
}

/* Home panels: one quiet surface, no card-inside-card treatment. */
:root[data-theme="dark"] #page-dashboard .home-panel {
  background: #0b0d10 !important;
  border: 1px solid rgba(255, 255, 255, 0.06) !important;
  box-shadow: none !important;
}
:root[data-theme="dark"] #page-dashboard .home-panel :is(.home-empty, .home-continue-card, .home-weak-item, .home-trend-item) {
  background: transparent !important;
  border: 0 !important;
  border-radius: 0 !important;
  box-shadow: none !important;
}
:root[data-theme="dark"] #page-dashboard .home-continue-card,
:root[data-theme="dark"] #page-dashboard .home-weak-item,
:root[data-theme="dark"] #page-dashboard .home-trend-item {
  border-bottom: 1px solid rgba(255, 255, 255, 0.06) !important;
}
:root[data-theme="dark"] #page-dashboard .home-continue-card:last-child,
:root[data-theme="dark"] #page-dashboard .home-weak-item:last-child,
:root[data-theme="dark"] #page-dashboard .home-trend-item:last-child {
  border-bottom: 0 !important;
}
:root[data-theme="dark"] #page-dashboard .panel-link,
:root[data-theme="dark"] #page-dashboard .home-text-action {
  background: transparent !important;
  border: 0 !important;
  box-shadow: none !important;
  color: #55d6be !important;
}
:root[data-theme="dark"] #page-dashboard .home-primary-action {
  background: #55d6be !important;
  color: #061311 !important;
  box-shadow: none !important;
}
:root[data-theme="dark"] #page-dashboard .home-trend-list,
:root[data-theme="dark"] #page-dashboard .home-chart-wrap,
:root[data-theme="dark"] #page-dashboard .home-chart-empty {
  background: transparent !important;
  border: 0 !important;
  box-shadow: none !important;
}

/* Practice center tabs: near-black rail with teal active state. Keep this final
   rule aligned with the inline fallback because this stylesheet loads later. */
:root[data-theme="dark"] #page-practice .learning-tabs {
  background: #050607 !important;
  background-color: #050607 !important;
  background-image: none !important;
  border: 0 !important;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06) !important;
  border-radius: 0 !important;
  box-shadow: none !important;
}
/* The legacy skin scopes its important background through #main-app.
   Keep the final Practice Center override at a higher specificity. */
html[data-theme="dark"] #main-app #page-practice .learning-tabs,
html[data-theme="dark"] #main-app #page-practice .learning-tabs > *,
html[data-theme="dark"] #main-app #page-practice .learning-tab,
html[data-theme="dark"] #main-app #page-practice [data-learning-tab] {
  background: #050607 !important;
  background-color: #050607 !important;
  background-image: none !important;
}
:root[data-theme="dark"] #page-practice .learning-tabs > *,
:root[data-theme="dark"] #page-practice .learning-tab,
:root[data-theme="dark"] #page-practice [data-learning-tab] {
  background: #050607 !important;
  background-color: #050607 !important;
  background-image: none !important;
  border: 0 !important;
  border-radius: 0 !important;
  color: #8a8f98 !important;
  appearance: none !important;
  box-shadow: none !important;
}
:root[data-theme="dark"] #page-practice .learning-tab:hover,
:root[data-theme="dark"] #page-practice .learning-tab:focus,
:root[data-theme="dark"] #page-practice .learning-tab:focus-visible,
:root[data-theme="dark"] #page-practice .learning-tab.active,
:root[data-theme="dark"] #page-practice [data-learning-tab]:hover,
:root[data-theme="dark"] #page-practice [data-learning-tab]:focus,
:root[data-theme="dark"] #page-practice [data-learning-tab]:focus-visible,
:root[data-theme="dark"] #page-practice [data-learning-tab].active {
  background: #050607 !important;
  background-color: #050607 !important;
  background-image: none !important;
  color: #ffffff !important;
}
:root[data-theme="dark"] #page-practice .learning-tab.active,
:root[data-theme="dark"] #page-practice [data-learning-tab].active {
  box-shadow: inset 0 -2px 0 #55d6be !important;
}
html[data-theme="dark"] #main-app #page-practice .learning-tab.active,
html[data-theme="dark"] #main-app #page-practice [data-learning-tab].active {
  background: #050607 !important;
  background-color: #050607 !important;
  box-shadow: inset 0 -2px 0 #55d6be !important;
}

/* Subject choices are dark list cards, never blue-filled buttons. */
:root[data-theme="dark"] #page-practice .pc-subject-card {
  background: #050607 !important;
  border: 1px solid rgba(255, 255, 255, 0.08) !important;
  border-radius: 10px !important;
  color: #ffffff !important;
  box-shadow: none !important;
}
:root[data-theme="dark"] #page-practice .pc-subject-card:hover:not(:disabled) {
  background: rgba(85, 214, 190, 0.1) !important;
  border-color: rgba(85, 214, 190, 0.55) !important;
  box-shadow: none !important;
}
:root[data-theme="dark"] #page-practice .pc-subject-card.is-selected {
  background: #050607 !important;
  border-color: #55d6be !important;
  color: #ffffff !important;
  box-shadow: none !important;
}
:root[data-theme="dark"] #page-practice .pc-subject-card > span:not(.pc-subject-check) {
  color: #8a8f98 !important;
}

/* Practice content and empty states use a single near-black surface. */
:root[data-theme="dark"] #page-practice :is(.card, .pc-card, .pc-practice-entry-panel, .pc-empty-state) {
  background: #0b0d10 !important;
  border-color: rgba(255, 255, 255, 0.06) !important;
  box-shadow: none !important;
}
:root[data-theme="dark"] #page-practice .pc-entry-note span,
:root[data-theme="dark"] #page-practice .pc-entry-step {
  background: transparent !important;
  border-color: rgba(255, 255, 255, 0.06) !important;
}

/* Today's plan result: override the legacy light surface on dynamically
   rendered summaries, progress rows, and tables without changing light mode. */
html[data-theme="dark"] #page-practice #pc-plan-results :is(
  .pc-plan-summary,
  .pc-state,
  .pc-q-item,
  .pc-plan-table-wrap
) {
  background: #101015 !important;
  background-image: none !important;
  border-color: rgba(255, 255, 255, 0.1) !important;
  color: #f5f7fa !important;
  box-shadow: none !important;
}
html[data-theme="dark"] #page-practice #pc-plan-results :is(
  .pc-plan-summary-row,
  .pc-dist-item,
  .pc-plan-table th,
  .pc-plan-table td,
  .pc-progress-meta,
  .pc-active-prompt-meta,
  .pc-state small
) {
  color: #a1a1aa !important;
}
html[data-theme="dark"] #page-practice #pc-plan-results :is(
  .pc-plan-summary-title,
  .pc-progress-label,
  .pc-plan-table th,
  .pc-plan-table td strong
) {
  color: #f5f7fa !important;
}
html[data-theme="dark"] #page-practice #pc-plan-results :is(
  .pc-plan-table th,
  .pc-plan-table td
) {
  border-bottom-color: rgba(255, 255, 255, 0.08) !important;
}
html[data-theme="dark"] #page-practice #pc-plan-results .pc-progress-bar {
  background: #252832 !important;
}
html[data-theme="dark"] #page-practice #pc-plan-results .pc-badge-partial {
  background: rgba(245, 158, 11, 0.16) !important;
  color: #fbbf24 !important;
}

/* Wrong-book review inside the Practice Center: keep dynamically rendered
   cards and controls on the same near-black surface as the surrounding page. */
html[data-theme="dark"] #page-practice #learning-wrongbook-mount,
html[data-theme="dark"] #page-practice #learning-wrongbook-mount #wrongbook-content,
html[data-theme="dark"] #page-practice #learning-wrongbook-mount #wb-tab-content {
  color: #f5f7fa !important;
}

html[data-theme="dark"] #page-practice #learning-wrongbook-mount :is(
  .settings-section,
  .wb-filter-group,
  #wb-wrong-list > *,
  #wb-reminder-list > *,
  #wb-wrong-pager > *,
  #wb-trend-estimate > *
) {
  background: #0b0d10 !important;
  background-image: none !important;
  border-color: rgba(255, 255, 255, 0.08) !important;
  color: #f5f7fa !important;
  box-shadow: none !important;
}

html[data-theme="dark"] #page-practice #learning-wrongbook-mount :is(
  .wb-view-tabs,
  .wb-filter-options
) {
  background: transparent !important;
  color: #f5f7fa !important;
}

html[data-theme="dark"] #page-practice #learning-wrongbook-mount :is(
  .wb-view-tab,
  .wb-filter-chip,
  .subject-btn,
  .question-btn
) {
  background: #050607 !important;
  border-color: rgba(255, 255, 255, 0.12) !important;
  color: #d7dbe2 !important;
  box-shadow: none !important;
}

html[data-theme="dark"] #page-practice #learning-wrongbook-mount :is(
  .wb-view-tab:hover,
  .wb-filter-chip:hover,
  .subject-btn:hover,
  .question-btn:hover
) {
  background: #11151a !important;
  border-color: rgba(85, 214, 190, 0.55) !important;
  color: #ffffff !important;
}

html[data-theme="dark"] #page-practice #learning-wrongbook-mount :is(
  .wb-view-tab.active,
  .wb-filter-chip.active,
  .subject-btn.active
) {
  background: rgba(85, 214, 190, 0.14) !important;
  border-color: #55d6be !important;
  color: #55d6be !important;
}

html[data-theme="dark"] #page-practice #learning-wrongbook-mount :is(
  h3,
  h4,
  strong,
  .wb-filter-label,
  [style*="color:var(--text-primary)"]
) {
  color: #f5f7fa !important;
}

html[data-theme="dark"] #page-practice #learning-wrongbook-mount :is(
  p,
  small,
  .no-data-tip,
  [style*="color:var(--text-muted)"],
  [style*="color:var(--text-secondary)"]
) {
  color: #a1a1aa !important;
}

html[data-theme="dark"] #page-practice #learning-wrongbook-mount :is(
  input,
  select,
  textarea,
  .form-input,
  .form-select
) {
  background: #11151a !important;
  border-color: rgba(255, 255, 255, 0.12) !important;
  color: #f5f7fa !important;
}
/* Final direct-host override for the dynamically moved legacy wrongbook. */
html[data-theme="dark"] #main-app #page-practice #learning-wrongbook-mount,
html[data-theme="dark"] #main-app #page-practice #learning-wrongbook-mount #wrongbook-content,
html[data-theme="dark"] #main-app #page-practice #learning-wrongbook-mount #wb-tab-content {
  background: #050607 !important;
  background-color: #050607 !important;
  background-image: none !important;
  color: #f5f7fa !important;
}
html[data-theme="dark"] #main-app #page-practice #learning-wrongbook-mount #wrongbook-content .settings-section,
html[data-theme="dark"] #main-app #page-practice #learning-wrongbook-mount #wrongbook-content > *,
html[data-theme="dark"] #main-app #page-practice #learning-wrongbook-mount #wb-tab-content > * {
  background: #0b0d10 !important;
  background-color: #0b0d10 !important;
  background-image: none !important;
  border-color: rgba(255, 255, 255, 0.10) !important;
  color: #f5f7fa !important;
  box-shadow: none !important;
}
html[data-theme="dark"] #main-app #page-practice #learning-wrongbook-mount :is(
  h1, h2, h3, h4, h5, h6, strong, label, span, div, p, small
) {
  color: #f5f7fa !important;
}
html[data-theme="dark"] #main-app #page-practice #learning-wrongbook-mount :is(
  input, select, textarea
) {
  background: #11151a !important;
  color: #f5f7fa !important;
  border-color: rgba(255, 255, 255, 0.14) !important;
}
html[data-theme="dark"] #main-app #page-practice #learning-wrongbook-mount :is(
  button, .question-btn, .wb-view-tab, .wb-filter-chip, .subject-btn
) {
  background: #050607 !important;
  color: #f5f7fa !important;
  border-color: rgba(255, 255, 255, 0.14) !important;
}
html[data-theme="dark"] #page-practice #pc-plan-results :is(
  .pc-status-active,
  .pc-status-completed,
  .pc-status-replaced
) {
  background: rgba(85, 214, 190, 0.14) !important;
  color: #55d6be !important;
}

/* =========================================================
   Practice Center light workspace skin
   Keep the reference-like white cards and blue interaction states
   scoped to the practice views so the dark workspace remains intact.
   ========================================================= */
html[data-theme="light"] #main-app:has(#page-practice:not(.hidden)) .app-workspace,
html[data-theme="light"] #main-app:has(#page-practice:not(.hidden)) .app-main,
html[data-theme="light"] #main-app:has(#page-practice:not(.hidden)) #page-practice,
html[data-theme="light"] #main-app:has(#page-practice-session:not(.hidden)) .app-workspace,
html[data-theme="light"] #main-app:has(#page-practice-session:not(.hidden)) .app-main,
html[data-theme="light"] #main-app:has(#page-practice-session:not(.hidden)) #page-practice-session {
  background: #f7f8fa !important;
  background-image: none !important;
  color: #101828 !important;
}

html[data-theme="light"] #main-app:has(#page-practice:not(.hidden)) #page-practice :is(
  .pc-card,
  .pc-practice-entry-panel,
  .pc-practice-progress,
  .pc-practice-card,
  .pc-answer-panel,
  .pc-analysis,
  .pc-state
),
html[data-theme="light"] #main-app:has(#page-practice-session:not(.hidden)) #page-practice-session :is(
  .pc-practice-progress,
  .pc-practice-card,
  .pc-answer-panel,
  .pc-analysis,
  .pc-state
) {
  background: #ffffff !important;
  background-image: none !important;
  border-color: #e4e7ec !important;
  box-shadow: 0 4px 14px rgba(16, 24, 40, 0.05) !important;
  color: #101828 !important;
}

html[data-theme="light"] #main-app:has(#page-practice:not(.hidden)) #page-practice :is(
  .learning-tabs,
  .learning-tab,
  [data-learning-tab]
) {
  background: #ffffff !important;
  background-image: none !important;
  color: #667085 !important;
}

html[data-theme="light"] #page-practice :is(.learning-tabs, .learning-tab, [data-learning-tab]) {
  border-color: #e4e7ec !important;
  box-shadow: none !important;
}

html[data-theme="light"] #page-practice :is(
  .learning-tab:hover,
  .learning-tab:focus-visible,
  .learning-tab.active,
  [data-learning-tab]:hover,
  [data-learning-tab]:focus-visible,
  [data-learning-tab].active
) {
  background: #ffffff !important;
  color: #175cd3 !important;
}

html[data-theme="light"] #page-practice :is(.learning-tab.active, [data-learning-tab].active) {
  box-shadow: inset 0 -2px 0 #3b82f6 !important;
}

html[data-theme="light"] #page-practice :is(
  .section-title,
  .pc-card-title,
  .pc-practice-title,
  .pc-practice-head,
  .pc-practice-meta,
  .pc-answer-panel-head,
  .pc-answer-summary,
  .pc-analysis-title,
  .pc-practice-empty-title
) {
  color: #101828 !important;
}

html[data-theme="light"] #page-practice :is(
  .learning-center-eyebrow,
  .pc-subtitle,
  .pc-card-desc,
  .pc-practice-eyebrow,
  .pc-answer-kicker,
  .pc-question-number,
  .pc-question-type,
  .pc-difficulty,
  .pc-knowledge,
  .pc-practice-progress-head span,
  .pc-progress-meta,
  .pc-q-meta
) {
  color: #667085 !important;
}

html[data-theme="light"] #page-practice .pc-subject-card,
html[data-theme="light"] #page-practice #pc-subject-grid > * {
  background: #ffffff !important;
  border-color: #e4e7ec !important;
  color: #344054 !important;
  box-shadow: 0 1px 3px rgba(16, 24, 40, 0.04) !important;
}

html[data-theme="light"] #page-practice .pc-subject-card:hover:not(:disabled),
html[data-theme="light"] #page-practice .pc-subject-card.is-selected,
html[data-theme="light"] #page-practice #pc-subject-grid > *:hover:not(:disabled) {
  background: #eff6ff !important;
  border-color: #60a5fa !important;
  color: #1d4ed8 !important;
  box-shadow: 0 3px 10px rgba(37, 99, 235, 0.10) !important;
}

html[data-theme="light"] #page-practice .pc-subject-card > span:not(.pc-subject-check) {
  color: #98a2b3 !important;
}

/* The check mark is an explicit selected-state affordance. Keep it isolated
   from legacy button rules and visible in both themes. */
#page-practice .pc-subject-card .pc-subject-check {
  display: none !important;
  grid-column: 2 !important;
  grid-row: 1 / span 2 !important;
  align-self: center !important;
  justify-self: end !important;
  place-items: center !important;
  width: 1.5rem !important;
  height: 1.5rem !important;
  padding: 0 !important;
  border: 0 !important;
  border-radius: 50% !important;
  background: #2563eb !important;
  color: #ffffff !important;
  font-size: .9rem !important;
  font-weight: 800 !important;
  line-height: 1 !important;
  opacity: 1 !important;
  visibility: visible !important;
  transform: none !important;
}

#page-practice .pc-subject-card.is-selected .pc-subject-check {
  display: grid !important;
}

html[data-theme="dark"] #page-practice .pc-subject-card.is-selected .pc-subject-check {
  background: #55d6be !important;
  color: #050607 !important;
}

html[data-theme="light"] #page-practice :is(.pc-entry-step, .pc-entry-note span),
html[data-theme="light"] #page-practice-session .pc-session-status span {
  background: #f8fafc !important;
  border-color: #e4e7ec !important;
  color: #667085 !important;
}

html[data-theme="light"] #page-practice-session .pc-session-status b {
  color: #344054 !important;
}

html[data-theme="light"] #page-practice :is(.pc-option, .pc-answer-text),
html[data-theme="light"] #page-practice-session :is(.pc-option, .pc-answer-text) {
  background: #ffffff !important;
  border-color: #d0d5dd !important;
  color: #344054 !important;
}

html[data-theme="light"] #page-practice :is(.pc-option:hover, .pc-option.is-selected),
html[data-theme="light"] #page-practice-session :is(.pc-option:hover, .pc-option.is-selected) {
  background: #eff6ff !important;
  border-color: #3b82f6 !important;
  color: #1d4ed8 !important;
}

html[data-theme="light"] #page-practice :is(.pc-progress-bar, .pc-progress-track),
html[data-theme="light"] #page-practice-session :is(.pc-progress-bar, .pc-progress-track) {
  background: #eaecf0 !important;
}

html[data-theme="light"] #page-practice :is(.pc-progress-fill, .pc-practice-progress-track > div),
html[data-theme="light"] #page-practice-session :is(.pc-progress-fill, .pc-practice-progress-track > div) {
  background: linear-gradient(90deg, #60a5fa, #2563eb) !important;
}

html[data-theme="light"] #page-practice :is(.pc-answer-row, .pc-answer-summary),
html[data-theme="light"] #page-practice-session :is(.pc-answer-row, .pc-answer-summary) {
  border-color: #e4e7ec !important;
  color: #344054 !important;
}

html[data-theme="light"] #page-practice :is(.pc-answer-row strong, .pc-correct-answer strong),
html[data-theme="light"] #page-practice-session :is(.pc-answer-row strong, .pc-correct-answer strong) {
  color: #1d4ed8 !important;
}

html[data-theme="light"] #page-practice :is(.pc-status-active, .pc-status-completed, .pc-status-replaced),
html[data-theme="light"] #page-practice-session :is(.pc-status-active, .pc-status-completed, .pc-status-replaced) {
  background: #eff6ff !important;
  color: #175cd3 !important;
}

/* Learning assistant: match the analytics black workspace without changing
   message, upload, model, or send-button interactions and status colors. */
html[data-theme="dark"] #page-ai-chat .ai-chat-container,
html[data-theme="dark"] #page-ai-chat .ai-history-panel,
html[data-theme="dark"] #page-ai-chat .ai-messages,
html[data-theme="dark"] #page-ai-chat .ai-input-area {
  background: #050607 !important;
  background-image: none !important;
  border-color: rgba(255, 255, 255, 0.08) !important;
  box-shadow: none !important;
}

html[data-theme="dark"] #page-ai-chat .ai-empty-state h2,
html[data-theme="dark"] #page-ai-chat .ai-empty-state p {
  color: #ffffff !important;
}

/* Learning assistant: extend the home-page black workspace skin to every
   visible surface. Keep all of these overrides dark-theme-only so the light
   assistant remains unchanged. */
html[data-theme="dark"] #main-app:has(#page-ai-chat:not(.hidden)) .app-main,
html[data-theme="dark"] #main-app:has(#page-ai-chat:not(.hidden)) #page-ai-chat {
  background: var(--workspace-bg) !important;
}

html[data-theme="dark"] #page-ai-chat .ai-chat-container {
  background: var(--workspace-bg) !important;
  border-color: var(--workspace-border-soft) !important;
}

html[data-theme="dark"] #page-ai-chat .ai-history-panel {
  background: var(--workspace-panel-deep) !important;
  border-right-color: var(--workspace-border-soft) !important;
}

html[data-theme="dark"] #page-ai-chat :is(
  .ai-history-head,
  .ai-history-list,
  .ai-input-area
) {
  background: transparent !important;
  color: var(--workspace-text) !important;
}

html[data-theme="dark"] #page-ai-chat :is(
  .ai-history-head strong,
  .ai-history-item,
  .ai-history-empty,
  .ai-empty-state p,
  .ai-input-hint
) {
  color: var(--workspace-text-secondary) !important;
}

/* Vocabulary accumulation: the legacy module renders most of its UI with
   light inline styles, so explicitly restyle the whole surface in dark mode. */
html[data-theme="dark"] :is(#page-vocab, #learning-vocab-mount) {
  color: #f5f7fa !important;
}

html[data-theme="dark"] :is(#page-vocab, #learning-panel-vocab, #learning-vocab-mount, #vocab-content) {
  background: transparent !important;
}

html[data-theme="dark"] :is(#page-vocab, #learning-vocab-mount) :is(
  .vocab-book-card,
  .vocab-overview,
  .vocab-task-list > *,
  [style*="background:#fff"],
  [style*="background: #fff"],
  [style*="background:#f1f6ff"],
  [style*="background: #f1f6ff"],
  [style*="background:#f8fafc"],
  [style*="background: #f8fafc"],
  [style*="background:#eaf0f6"],
  [style*="background: #eaf0f6"],
  #vocab-search-results,
  .vocab-search-item
) {
  background: #0b0d10 !important;
  background-image: none !important;
  border-color: rgba(255, 255, 255, 0.1) !important;
  color: #f5f7fa !important;
  box-shadow: none !important;
}

html[data-theme="dark"] :is(#page-vocab, #learning-vocab-mount) .vocab-search-item {
  border-bottom-color: rgba(255, 255, 255, 0.08) !important;
}

html[data-theme="dark"] :is(#page-vocab, #learning-vocab-mount) .vocab-search-item:hover {
  background: #1b1f24 !important;
}

html[data-theme="dark"] :is(#page-vocab, #learning-vocab-mount) :is(
  h1, h2, h3, h4, h5, h6, strong,
  [style*="color:#17324d"],
  [style*="color: #17324d"]
) {
  color: #f5f7fa !important;
}

html[data-theme="dark"] :is(#page-vocab, #learning-vocab-mount) :is(
  p, small, label,
  [style*="color:#526986"],
  [style*="color: #526986"],
  [style*="color:#67809f"],
  [style*="color: #67809f"]
) {
  color: #a1a1aa !important;
}

html[data-theme="dark"] :is(#page-vocab, #learning-vocab-mount) :is(
  input, select, textarea,
  .form-input, .form-select
) {
  background: #11151a !important;
  background-image: none !important;
  border-color: rgba(255, 255, 255, 0.14) !important;
  color: #f5f7fa !important;
  box-shadow: none !important;
}

html[data-theme="dark"] :is(#page-vocab, #learning-vocab-mount) :is(
  input, select, textarea
)::placeholder {
  color: #717782 !important;
}

html[data-theme="dark"] :is(#page-vocab, #learning-vocab-mount) :is(
  button, .btn-primary, .btn-secondary,
  .vocab-subject-btn, .vocab-book-action
) {
  background-color: #11151a !important;
  background-image: none !important;
  border-color: rgba(255, 255, 255, 0.14) !important;
  color: #d7dbe2 !important;
  box-shadow: none !important;
}

html[data-theme="dark"] :is(#page-vocab, #learning-vocab-mount) :is(
  button:hover, .btn-primary:hover, .btn-secondary:hover,
  .vocab-subject-btn:hover, .vocab-book-action:hover
) {
  background-color: #1b1f24 !important;
  border-color: rgba(85, 214, 190, 0.55) !important;
  color: #ffffff !important;
}

html[data-theme="dark"] :is(#page-vocab, #learning-vocab-mount) :is(
  .vocab-subject-active, .vocab-book-action-ai
) {
  background: rgba(85, 214, 190, 0.14) !important;
  border-color: #55d6be !important;
  color: #55d6be !important;
}

html[data-theme="dark"] :is(#page-vocab, #learning-vocab-mount) :is(
  [style*="background:#e8f1ff"],
  [style*="background: #e8f1ff"],
  [style*="background:#eaf4ff"],
  [style*="background: #eaf4ff"]
) {
  background: #10151a !important;
  border-color: rgba(85, 214, 190, 0.25) !important;
}

/* The task editor is appended directly to body rather than to #page-vocab. */
html[data-theme="dark"] body :is(
  #vocab-task-modal, #vocab-task-overlay, .vocab-task-modal,
  [id*="vocab-task"]
) {
  color: #f5f7fa !important;
}
html[data-theme="dark"] body :is(
  #vocab-task-modal, #vocab-task-overlay, .vocab-task-modal,
  [id*="vocab-task"]
) :is(input, select, textarea) {
  background: #11151a !important;
  border-color: rgba(255, 255, 255, 0.14) !important;
  color: #f5f7fa !important;
}

html[data-theme="dark"] body > div:has(#vocab-task-name) {
  background: rgba(5, 6, 7, 0.78) !important;
  color: #f5f7fa !important;
}
html[data-theme="dark"] body > div:has(#vocab-task-name) > div {
  background: #0b0d10 !important;
  border-color: rgba(255, 255, 255, 0.12) !important;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.45) !important;
  color: #f5f7fa !important;
}
html[data-theme="dark"] body > div:has(#vocab-task-name) :is(
  h3, p, label
) {
  color: #f5f7fa !important;
}
html[data-theme="dark"] body > div:has(#vocab-task-name) p,
html[data-theme="dark"] body > div:has(#vocab-task-name) label {
  color: #a1a1aa !important;
}
html[data-theme="dark"] body > div:has(#vocab-task-name) :is(
  input, select, textarea
) {
  background: #11151a !important;
  border-color: rgba(255, 255, 255, 0.14) !important;
  color: #f5f7fa !important;
}
html[data-theme="dark"] body > div:has(#vocab-task-name) :is(
  .vocab-task-cancel, .vocab-task-save
) {
  background: #11151a !important;
  border-color: rgba(255, 255, 255, 0.14) !important;
  color: #d7dbe2 !important;
}
html[data-theme="dark"] body > div:has(#vocab-task-name) .vocab-task-save {
  background: #0f766e !important;
  border-color: #2bbfa5 !important;
  color: #ffffff !important;
}

html[data-theme="dark"] #page-ai-chat :is(
  .ai-history-new,
  .ai-history-close,
  .ai-history-toggle,
  .ai-upload-btn,
  .ai-model-inline
) {
  background: var(--workspace-panel) !important;
  border-color: var(--workspace-border) !important;
  color: var(--workspace-text-secondary) !important;
  box-shadow: none !important;
}

html[data-theme="dark"] #page-ai-chat :is(
  .ai-history-new:hover,
  .ai-history-close:hover,
  .ai-history-toggle:hover,
  .ai-upload-btn:hover,
  .ai-model-inline:hover
) {
  background: var(--workspace-panel-hover) !important;
  color: var(--workspace-text) !important;
}

html[data-theme="dark"] #page-ai-chat .ai-history-item {
  background: #0d0e11 !important;
  border-color: var(--workspace-border-soft) !important;
}

html[data-theme="dark"] #page-ai-chat .ai-history-item:hover {
  background: var(--workspace-panel-hover) !important;
  color: var(--workspace-text) !important;
}

html[data-theme="dark"] #page-ai-chat .ai-messages {
  background: var(--workspace-bg) !important;
  color: var(--workspace-text) !important;
}

html[data-theme="dark"] #page-ai-chat .ai-empty-state h2 {
  color: var(--workspace-text) !important;
}

html[data-theme="dark"] #page-ai-chat .ai-msg-avatar {
  border: 1px solid var(--workspace-border-soft) !important;
}

html[data-theme="dark"] #page-ai-chat .ai-msg-bot .ai-msg-bubble {
  background: var(--workspace-panel) !important;
  border-color: var(--workspace-border) !important;
  color: var(--workspace-text) !important;
}

html[data-theme="dark"] #page-ai-chat .ai-msg-user .ai-msg-bubble {
  background: rgba(117, 103, 242, 0.28) !important;
  border: 1px solid rgba(117, 103, 242, 0.36) !important;
  color: #f5f3ff !important;
}

html[data-theme="dark"] #page-ai-chat .ai-input-area {
  background: var(--workspace-panel-deep) !important;
  border-top-color: var(--workspace-border-soft) !important;
}

html[data-theme="dark"] #page-ai-chat .ai-input-row {
  background: transparent !important;
}

html[data-theme="dark"] #page-ai-chat .ai-input {
  background: #0d0e11 !important;
  border-color: var(--workspace-border) !important;
  color: var(--workspace-text) !important;
}

html[data-theme="dark"] #page-ai-chat .ai-input::placeholder {
  color: var(--workspace-text-muted) !important;
}

html[data-theme="dark"] #page-ai-chat .ai-input:focus {
  border-color: var(--workspace-accent) !important;
  box-shadow: 0 0 0 3px rgba(117, 103, 242, 0.14) !important;
}

html[data-theme="dark"] #page-ai-chat .ai-send {
  background: var(--workspace-accent) !important;
  color: #ffffff !important;
  box-shadow: none !important;
}

html[data-theme="dark"] #page-ai-chat .ai-send:hover {
  background: var(--workspace-accent-light) !important;
}

html[data-theme="dark"] #page-ai-chat .ai-attachment-preview .att-item {
  background: #0d0e11 !important;
  border-color: var(--workspace-border) !important;
  color: var(--workspace-text-secondary) !important;
}

html[data-theme="dark"] #page-ai-chat :is(
  #ai-quota-bar,
  #ai-page-quota-bar,
  .ai-status,
  .ai-providers
) {
  background: var(--workspace-panel-deep) !important;
  border-color: var(--workspace-border-soft) !important;
  color: var(--workspace-text-secondary) !important;
}

html[data-theme="dark"] #ai-model-select-mask {
  background: rgba(0, 0, 0, 0.72) !important;
}

html[data-theme="dark"] #ai-model-select-panel {
  background: var(--workspace-panel-deep) !important;
  border: 1px solid var(--workspace-border) !important;
  color: var(--workspace-text) !important;
  box-shadow: 0 -8px 32px rgba(0, 0, 0, 0.55) !important;
}

html[data-theme="dark"] #ai-model-select-panel > div:first-child > div:first-child,
html[data-theme="dark"] #ai-model-select-panel > div:nth-child(2) {
  color: var(--workspace-text) !important;
}

html[data-theme="dark"] #ai-model-select-panel > div:first-child button {
  color: var(--workspace-text-secondary) !important;
}

html[data-theme="dark"] #ai-model-select-panel [data-id] {
  background: #0d0e11 !important;
  border-color: var(--workspace-border-soft) !important;
}

html[data-theme="dark"] #ai-model-select-panel [data-id][style*="rgba(139,92,246,0.08)"] {
  background: rgba(117, 103, 242, 0.18) !important;
  border-color: rgba(117, 103, 242, 0.48) !important;
}

html[data-theme="dark"] #ai-model-select-panel [data-id] span[style*="color:#1e293b"] {
  color: var(--workspace-text) !important;
}

html[data-theme="dark"] #ai-model-select-panel [data-id] span[style*="color:#64748b"] {
  color: var(--workspace-text-secondary) !important;
}

/* FINAL LEARNING ASSISTANT BLACK SKIN
   The assistant has legacy blue defaults and also injects runtime styles.
   Keep this last block dark-theme-only and use explicit colors so those
   defaults cannot turn the assistant workspace blue again. */
html[data-theme="dark"] #main-app:has(#page-ai-chat:not(.hidden)),
html[data-theme="dark"] #main-app:has(#page-ai-chat:not(.hidden)) .app-workspace,
html[data-theme="dark"] #main-app:has(#page-ai-chat:not(.hidden)) .app-main,
html[data-theme="dark"] #main-app:has(#page-ai-chat:not(.hidden)) #page-ai-chat,
html[data-theme="dark"] #main-app:has(#page-ai-chat:not(.hidden)) #page-ai-chat > * {
  background: #050607 !important;
  background-image: none !important;
  color: #f5f7fa !important;
}

html[data-theme="dark"] #main-app:has(#page-ai-chat:not(.hidden)) .app-sidebar,
html[data-theme="dark"] #main-app:has(#page-ai-chat:not(.hidden)) .sidebar-brand,
html[data-theme="dark"] #main-app:has(#page-ai-chat:not(.hidden)) .sidebar-account,
html[data-theme="dark"] #main-app:has(#page-ai-chat:not(.hidden)) .app-sidebar .nav-item,
html[data-theme="dark"] #main-app:has(#page-ai-chat:not(.hidden)) .theme-toggle,
html[data-theme="dark"] #main-app:has(#page-ai-chat:not(.hidden)) .sidebar-utility-btn {
  background: #0b0d10 !important;
  background-image: none !important;
  border-color: rgba(255, 255, 255, 0.08) !important;
  color: #aeb5bf !important;
  box-shadow: none !important;
}

html[data-theme="dark"] #main-app:has(#page-ai-chat:not(.hidden)) .app-sidebar .nav-item:hover,
html[data-theme="dark"] #main-app:has(#page-ai-chat:not(.hidden)) .theme-toggle:hover,
html[data-theme="dark"] #main-app:has(#page-ai-chat:not(.hidden)) .sidebar-utility-btn:hover {
  background: #15181d !important;
  color: #ffffff !important;
}

html[data-theme="dark"] #main-app:has(#page-ai-chat:not(.hidden)) .app-sidebar .nav-item.active {
  background: rgba(85, 214, 190, 0.12) !important;
  background-image: none !important;
  border-color: rgba(85, 214, 190, 0.35) !important;
  color: #55d6be !important;
  box-shadow: inset 3px 0 #55d6be !important;
}

html[data-theme="dark"] #page-ai-chat .ai-chat-container,
html[data-theme="dark"] #page-ai-chat .ai-messages {
  background: #050607 !important;
  background-image: none !important;
  border-color: rgba(255, 255, 255, 0.08) !important;
  box-shadow: none !important;
}

html[data-theme="dark"] #page-ai-chat .ai-history-panel,
html[data-theme="dark"] #page-ai-chat .ai-input-area {
  background: #0b0d10 !important;
  background-image: none !important;
  border-color: rgba(255, 255, 255, 0.08) !important;
  box-shadow: none !important;
}

html[data-theme="dark"] #page-ai-chat :is(
  .ai-history-head,
  .ai-history-list,
  .ai-input-row,
  .ai-empty-state
) {
  background: transparent !important;
  background-image: none !important;
}

html[data-theme="dark"] #page-ai-chat :is(
  .ai-empty-state h2,
  .ai-empty-state p,
  .ai-history-head,
  .ai-history-head strong,
  .ai-history-empty,
  .ai-input-hint,
  .ai-status,
  .ai-provider,
  .ai-providers
) {
  color: #aeb5bf !important;
}

html[data-theme="dark"] #page-ai-chat .ai-empty-state h2 {
  color: #f5f7fa !important;
}

html[data-theme="dark"] #page-ai-chat :is(
  .ai-history-new,
  .ai-history-close,
  .ai-history-toggle,
  .ai-history-item,
  .ai-upload-btn,
  .ai-model-inline
) {
  background: #15181d !important;
  background-image: none !important;
  border-color: rgba(255, 255, 255, 0.12) !important;
  color: #aeb5bf !important;
  box-shadow: none !important;
}

html[data-theme="dark"] #page-ai-chat :is(
  .ai-history-new:hover,
  .ai-history-close:hover,
  .ai-history-toggle:hover,
  .ai-history-item:hover,
  .ai-upload-btn:hover,
  .ai-model-inline:hover
) {
  background: rgba(85, 214, 190, 0.12) !important;
  border-color: rgba(85, 214, 190, 0.42) !important;
  color: #55d6be !important;
}

html[data-theme="dark"] #page-ai-chat .ai-msg-user .ai-msg-avatar,
html[data-theme="dark"] #page-ai-chat .ai-msg-bot .ai-msg-avatar {
  background: #15181d !important;
  border: 1px solid rgba(255, 255, 255, 0.1) !important;
}

html[data-theme="dark"] #page-ai-chat .ai-msg-bot .ai-msg-bubble {
  background: #15181d !important;
  border: 1px solid rgba(255, 255, 255, 0.1) !important;
  color: #f5f7fa !important;
}

html[data-theme="dark"] #page-ai-chat .ai-msg-user .ai-msg-bubble {
  background: rgba(85, 214, 190, 0.14) !important;
  border: 1px solid rgba(85, 214, 190, 0.3) !important;
  color: #f5f7fa !important;
}

html[data-theme="dark"] #page-ai-chat .ai-input {
  background: #15181d !important;
  background-image: none !important;
  border-color: rgba(255, 255, 255, 0.13) !important;
  color: #f5f7fa !important;
  box-shadow: none !important;
}

html[data-theme="dark"] #page-ai-chat .ai-input::placeholder {
  color: #717780 !important;
}

html[data-theme="dark"] #page-ai-chat .ai-input:focus {
  border-color: #55d6be !important;
  box-shadow: 0 0 0 3px rgba(85, 214, 190, 0.14) !important;
}

html[data-theme="dark"] #page-ai-chat .ai-send {
  background: #55d6be !important;
  background-image: none !important;
  border-color: #55d6be !important;
  color: #07100f !important;
  box-shadow: none !important;
}

html[data-theme="dark"] #page-ai-chat .ai-send:hover {
  background: #72e3cc !important;
  border-color: #72e3cc !important;
}

html[data-theme="dark"] #page-ai-chat .ai-attachment-preview .att-item {
  background: #15181d !important;
  border-color: rgba(255, 255, 255, 0.12) !important;
  color: #aeb5bf !important;
}

html[data-theme="dark"] #page-ai-chat :is(
  #ai-quota-bar,
  #ai-page-quota-bar,
  .ai-status,
  .ai-providers
) {
  background: #0b0d10 !important;
  background-image: none !important;
  border-color: rgba(255, 255, 255, 0.08) !important;
  color: #aeb5bf !important;
}

html[data-theme="dark"] #page-ai-chat :is(
  #ai-quota-bar b,
  #ai-page-quota-bar b,
  .ai-status .dot,
  .ai-providers .p
) {
  color: #55d6be !important;
}

html[data-theme="dark"] #ai-model-select-mask {
  background: rgba(0, 0, 0, 0.78) !important;
}

html[data-theme="dark"] #ai-model-select-panel {
  background: #0b0d10 !important;
  background-image: none !important;
  border: 1px solid rgba(255, 255, 255, 0.12) !important;
  color: #f5f7fa !important;
  box-shadow: 0 -8px 32px rgba(0, 0, 0, 0.65) !important;
}

html[data-theme="dark"] #ai-model-select-panel [data-id] {
  background: #15181d !important;
  background-image: none !important;
  border-color: rgba(255, 255, 255, 0.1) !important;
}

html[data-theme="dark"] #ai-model-select-panel [data-id][style*="rgba(139,92,246,0.08)"],
html[data-theme="dark"] #ai-model-select-panel [data-id]:hover {
  background: rgba(85, 214, 190, 0.12) !important;
  border-color: rgba(85, 214, 190, 0.45) !important;
}

html[data-theme="dark"] #ai-model-select-panel :is(
  > div:first-child > div:first-child,
  > div:nth-child(2),
  [data-id] span[style*="color:#1e293b"]
) {
  color: #f5f7fa !important;
}

html[data-theme="dark"] #ai-model-select-panel :is(
  > div:first-child button,
  [data-id] span[style*="color:#64748b"]
) {
  color: #aeb5bf !important;
}

/* LAST AI WORKSPACE SURFACE OVERRIDE
   The legacy shell paints .app-main and the input row with blue-grey
   backgrounds. Keep every visible assistant surface near-black, while
   leaving the light theme and all behavior untouched. */
html[data-theme="dark"] #main-app:has(#page-ai-chat:not(.hidden)) .app-main,
html[data-theme="dark"] #main-app:has(#page-ai-chat:not(.hidden)) .app-main > *,
html[data-theme="dark"] #main-app:has(#page-ai-chat:not(.hidden)) #page-ai-chat,
html[data-theme="dark"] #main-app:has(#page-ai-chat:not(.hidden)) #page-ai-chat > *,
html[data-theme="dark"] #main-app:has(#page-ai-chat:not(.hidden)) .ai-workspace {
  background: #050607 !important;
  background-color: #050607 !important;
  background-image: none !important;
}

html[data-theme="dark"] #page-ai-chat .ai-chat-container {
  border-color: rgba(255, 255, 255, 0.08) !important;
}

html[data-theme="dark"] #page-ai-chat .ai-input-area {
  background: #0b0d10 !important;
  background-color: #0b0d10 !important;
  border-top-color: rgba(255, 255, 255, 0.08) !important;
}

html[data-theme="dark"] #page-ai-chat .ai-input-row {
  background: #15181d !important;
  background-color: #15181d !important;
  border: 1px solid rgba(255, 255, 255, 0.12) !important;
  border-radius: 22px !important;
  box-shadow: none !important;
}

html[data-theme="dark"] #page-ai-chat .ai-input-row .ai-input {
  background: transparent !important;
  background-color: transparent !important;
  border-color: transparent !important;
}

html[data-theme="dark"] #page-ai-chat :is(.ai-send, #btn-ai-send) {
  background: #55d6be !important;
  background-color: #55d6be !important;
  background-image: none !important;
  border: 1px solid #55d6be !important;
  color: #07100f !important;
  box-shadow: none !important;
}

html[data-theme="dark"] #page-ai-chat :is(.ai-send, #btn-ai-send):hover {
  background: #72e3cc !important;
  background-color: #72e3cc !important;
  border-color: #72e3cc !important;
}

html[data-theme="dark"] #page-ai-chat :is(.ai-upload-btn, .ai-model-inline) {
  background: transparent !important;
  background-color: transparent !important;
  border-color: transparent !important;
  color: #aeb5bf !important;
}

html[data-theme="dark"] #page-ai-chat :is(.ai-upload-btn, .ai-model-inline):hover {
  background: rgba(85, 214, 190, 0.12) !important;
  background-color: rgba(85, 214, 190, 0.12) !important;
  color: #55d6be !important;
}

/* FINAL AI INNER SURFACE OVERRIDE */
html[data-theme="dark"] #page-ai-chat :is(
  .ai-messages,
  #ai-messages,
  .ai-history,
  .ai-history-panel,
  .ai-history-list,
  .ai-empty-state,
  .ai-input-hint,
  .ai-attachment-preview
) {
  background: #050607 !important;
  background-color: #050607 !important;
  background-image: none !important;
}

/* FINAL LEARNING ASSISTANT DARK SURFACE OVERRIDE
   Keep the assistant page black without changing other pages. */
html[data-theme="dark"] body #main-app:has(#page-ai-chat:not(.hidden)),
html[data-theme="dark"] body #main-app:has(#page-ai-chat:not(.hidden)) > .app-workspace,
html[data-theme="dark"] body #main-app:has(#page-ai-chat:not(.hidden)) > .app-workspace > .app-main,
html[data-theme="dark"] body #main-app:has(#page-ai-chat:not(.hidden)) > .app-workspace > .app-main > #page-ai-chat,
html[data-theme="dark"] body #main-app:has(#page-ai-chat:not(.hidden)) #page-ai-chat .ai-chat-container,
html[data-theme="dark"] body #main-app:has(#page-ai-chat:not(.hidden)) #page-ai-chat .ai-messages,
html[data-theme="dark"] body #main-app:has(#page-ai-chat:not(.hidden)) #page-ai-chat .ai-input-area {
  background: #050607 !important;
  background-color: #050607 !important;
  background-image: none !important;
  border-color: #1b1d21 !important;
  box-shadow: none !important;
}

html[data-theme="dark"] body #main-app:has(#page-ai-chat:not(.hidden)) #page-ai-chat .ai-empty-state h2 {
  color: #ffffff !important;
}

html[data-theme="dark"] body #main-app:has(#page-ai-chat:not(.hidden)) #page-ai-chat .ai-empty-state p {
  color: #d7dbe2 !important;
}

/* Keep the Learning Assistant composer on the page surface. The field itself
   remains a distinct light input with its own border. */
html #main-app:has(#page-ai-chat:not(.hidden)) #page-ai-chat .ai-input-area,
html #main-app:has(#page-ai-chat:not(.hidden)) #page-ai-chat .ai-attachment-preview {
  background: var(--bg-primary) !important;
  background-color: var(--bg-primary) !important;
  background-image: none !important;
}
html #main-app:has(#page-ai-chat:not(.hidden)) #page-ai-chat .ai-input-row {
  background: var(--bg-input) !important;
  background-color: var(--bg-input) !important;
  background-image: none !important;
  border: 1px solid rgba(148, 163, 184, 0.2) !important;
  border-radius: 22px !important;
  box-shadow: 0 2px 8px rgba(15, 23, 42, 0.06) !important;
}

html #main-app:has(#page-ai-chat:not(.hidden)) #page-ai-chat .ai-input {
  background: transparent !important;
  background-color: transparent !important;
  background-image: none !important;
  border-color: transparent !important;
  color: var(--text-primary) !important;
}

/* LIGHT LEARNING ASSISTANT SURFACE
   Keep the empty workspace visually quiet. The composer should read as one
   compact control, not as a second grey panel inside the white page. */
html[data-theme="light"] #main-app:has(#page-ai-chat:not(.hidden)),
html[data-theme="light"] #main-app:has(#page-ai-chat:not(.hidden)) > .app-workspace,
html[data-theme="light"] #main-app:has(#page-ai-chat:not(.hidden)) > .app-workspace > .app-main,
html[data-theme="light"] #main-app:has(#page-ai-chat:not(.hidden)) > .app-workspace > .app-main > #page-ai-chat,
html[data-theme="light"] #main-app:has(#page-ai-chat:not(.hidden)) #page-ai-chat .ai-chat-container,
html[data-theme="light"] #main-app:has(#page-ai-chat:not(.hidden)) #page-ai-chat .ai-messages,
html[data-theme="light"] #main-app:has(#page-ai-chat:not(.hidden)) #page-ai-chat .ai-empty-state,
html[data-theme="light"] #main-app:has(#page-ai-chat:not(.hidden)) #page-ai-chat .ai-input-area,
html[data-theme="light"] #main-app:has(#page-ai-chat:not(.hidden)) #page-ai-chat .ai-input-hint {
  background: #ffffff !important;
  background-color: #ffffff !important;
  background-image: none !important;
}

html[data-theme="light"] #main-app:has(#page-ai-chat:not(.hidden)) #page-ai-chat .ai-chat-container {
  border-color: #e9edf3 !important;
  box-shadow: none !important;
}

html[data-theme="light"] #main-app:has(#page-ai-chat:not(.hidden)) #page-ai-chat .ai-input-area {
  border-top: 1px solid #eef1f5 !important;
  padding-top: 12px;
}

html[data-theme="light"] #main-app:has(#page-ai-chat:not(.hidden)) #page-ai-chat .ai-input-row {
  background: #ffffff !important;
  background-color: #ffffff !important;
  border: 1px solid #dfe5ec !important;
  box-shadow: 0 2px 8px rgba(15, 23, 42, 0.05) !important;
}

html[data-theme="light"] #main-app:has(#page-ai-chat:not(.hidden)) #page-ai-chat .ai-input {
  background: transparent !important;
  background-color: transparent !important;
  border-color: transparent !important;
}

html[data-theme="dark"] #main-app:has(#page-ai-chat:not(.hidden)) #page-ai-chat .ai-input-row {
  background: #15181d !important;
  background-color: #15181d !important;
  border-color: rgba(255, 255, 255, 0.12) !important;
  box-shadow: none !important;
}

html[data-theme="dark"] #main-app:has(#page-ai-chat:not(.hidden)) #page-ai-chat .ai-input {
  color: var(--text-primary) !important;
}

/* FINAL PRACTICE OPTION TEXT OVERRIDE
   Answer options retain their light-blue selected surface after submission.
   Keep the selected answer text dark in every theme, including when a later
   legacy dark-mode rule applies white text to page descendants. */
html #main-app #page-practice label.pc-option.is-selected,
html #main-app #page-practice label.pc-option:has(input:checked),
html #main-app #page-practice-session label.pc-option.is-selected,
html #main-app #page-practice-session label.pc-option:has(input:checked) {
  border-color: #dbe1ea !important;
  box-shadow: none !important;
}

html #main-app #page-practice label.pc-option.is-selected > span,
html #main-app #page-practice label.pc-option:has(input:checked) > span {
  color: #111827 !important;
  -webkit-text-fill-color: #111827 !important;
}

html #main-app #page-practice label.pc-option.is-selected,
html #main-app #page-practice label.pc-option:has(input:checked),
html #main-app #page-practice label.pc-option.is-selected > span,
html #main-app #page-practice label.pc-option:has(input:checked) > span {
  border-color: #dbe1ea !important;
  box-shadow: none !important;
}

html #main-app #page-practice label.pc-option.is-selected,
html #main-app #page-practice label.pc-option:has(input:checked),
html #main-app #page-practice label.pc-option.is-selected > span,
html #main-app #page-practice label.pc-option:has(input:checked) > span {
  color: #111827 !important;
  -webkit-text-fill-color: #111827 !important;
}

html #main-app #page-practice label.pc-option.is-selected b,
html #main-app #page-practice label.pc-option:has(input:checked) b {
  color: #1d4ed8 !important;
  -webkit-text-fill-color: #1d4ed8 !important;
}

/* The submitted question is rendered in the session host. Keep its selected
   option text black in light mode instead of inheriting a theme text color. */
html[data-theme="light"] #main-app #page-practice-session label.pc-option.is-selected,
html[data-theme="light"] #main-app #page-practice-session label.pc-option:has(input:checked),
html[data-theme="light"] #main-app #page-practice-session label.pc-option.is-selected > span,
html[data-theme="light"] #main-app #page-practice-session label.pc-option:has(input:checked) > span {
  color: #111827 !important;
  -webkit-text-fill-color: #111827 !important;
}

html[data-theme="light"] #main-app #page-practice-session label.pc-option.is-selected b,
html[data-theme="light"] #main-app #page-practice-session label.pc-option:has(input:checked) b {
  color: #1d4ed8 !important;
  -webkit-text-fill-color: #1d4ed8 !important;
}

/* Selected options use the surface and radio control for feedback; do not draw
   an extra blue frame around the whole option card. */
html #main-app #page-practice label.pc-option.is-selected,
html #main-app #page-practice label.pc-option:has(input:checked),
html #main-app #page-practice-session label.pc-option.is-selected,
html #main-app #page-practice-session label.pc-option:has(input:checked) {
  border-color: #dbe1ea !important;
  box-shadow: none !important;
}

/* Global form-focus rules must not draw a rectangular ring around practice radios.
   This covers both the entry page and the dynamically rendered session host. */
html #main-app :is(#page-practice, #page-practice-session) label.pc-option input[type="radio"],
html #main-app :is(#page-practice, #page-practice-session) label.pc-option input[type="radio"]:focus,
html #main-app :is(#page-practice, #page-practice-session) label.pc-option input[type="radio"]:focus-visible {
  outline: none !important;
  outline-offset: 0 !important;
  box-shadow: none !important;
}

/* FINAL MY-PAGE OVERRIDE
   renderSettings() uses generic .form-card and inline-styled direct children
   under #settings-subjects. Keep those real surfaces graphite, not blue-gray. */
html[data-theme="dark"] #main-app:has(#page-settings:not(.hidden)) #page-settings :is(
  .form-card,
  .settings-section,
  .v48-profile-links,
  .v48-admin-card
) {
  background: #0b0d10 !important;
  background-color: #0b0d10 !important;
  background-image: none !important;
  border-color: rgba(255, 255, 255, 0.10) !important;
  box-shadow: none !important;
}

html[data-theme="dark"] #main-app:has(#page-settings:not(.hidden)) #page-settings #settings-subjects > div {
  background: #111418 !important;
  background-color: #111418 !important;
  background-image: none !important;
  border: 1px solid rgba(255, 255, 255, 0.10) !important;
  box-shadow: none !important;
}

html[data-theme="dark"] #main-app:has(#page-settings:not(.hidden)) #page-settings #settings-subjects > div:hover {
  border-color: rgba(85, 214, 190, 0.35) !important;
}

html[data-theme="dark"] #main-app:has(#page-settings:not(.hidden)) #page-settings :is(
  .form-card input:not([type="checkbox"]),
  .form-card select,
  .form-card textarea,
  #settings-subjects input:not([type="checkbox"])
) {
  background: #15191e !important;
  background-color: #15191e !important;
  background-image: none !important;
  border-color: rgba(255, 255, 255, 0.12) !important;
  color: #f5f7fa !important;
  box-shadow: none !important;
}

html[data-theme="dark"] #main-app:has(#page-settings:not(.hidden)) #page-settings #btn-save-settings {
  background: #0f766e !important;
  background-image: none !important;
  border-color: #2bbfa5 !important;
  color: #f2fffc !important;
  box-shadow: none !important;
}

html[data-theme="dark"] #main-app:has(#page-settings:not(.hidden)) #page-settings #btn-save-settings:hover {
  background: #159f8c !important;
  border-color: #55d6be !important;
}

/* FINAL VOCABULARY DARK OVERRIDE
   renderVocab() emits legacy inline light styles. These selectors intentionally
   use !important so the accumulation page cannot fall back to white surfaces. */
html[data-theme="dark"] #page-vocab #vocab-content,
html[data-theme="dark"] #page-vocab #vocab-content .vocab-search-bar {
  color: #f1f5f9 !important;
}

html[data-theme="dark"] #page-vocab #vocab-content .vocab-book-card,
html[data-theme="dark"] #page-vocab #vocab-content #vocab-global-search,
html[data-theme="dark"] #page-vocab #vocab-content #vocab-search-results,
html[data-theme="dark"] #page-vocab #vocab-content .vocab-search-item,
html[data-theme="dark"] #page-vocab #vocab-content > div[style*="background:#fff"] {
  background: #15181d !important;
  background-color: #15181d !important;
  color: #f1f5f9 !important;
  border-color: rgba(255, 255, 255, 0.14) !important;
}

html[data-theme="dark"] #page-vocab #vocab-content #vocab-global-search::placeholder {
  color: #94a3b8 !important;
}

html[data-theme="dark"] #page-vocab #vocab-content :is(
  [style*="color:#17324d"], [style*="color: #17324d"],
  [style*="color:#526986"], [style*="color: #526986"],
  [style*="color:#64748b"], [style*="color: #64748b"]
) {
  color: #cbd5e1 !important;
}