/* ============================================================
   多维能力追踪系统 - 主样式表 (Sci-Fi / Gaming 风格)
   ============================================================ */

/* ===== CSS 变量 ===== */
:root {
  --bg-deep: #0a0e17;
  --bg-panel: #111827;
  --bg-card: #1a1f2e;
  --bg-card-hover: #1f2a3a;
  --bg-input: #0d1117;
  --border: #2a3a5c;
  --border-active: #4a9eff;
  --border-glow: #3b82f6;
  --text-primary: #e0e8f0;
  --text-secondary: #8899b4;
  --text-muted: #5a6a85;
  --accent-blue: #4a9eff;
  --accent-cyan: #00d4ff;
  --accent-green: #00e676;
  --accent-orange: #ff9100;
  --accent-red: #ff3d45;
  --accent-purple: #b388ff;
  --accent-pink: #ff79c6;
  --accent-yellow: #ffd740;
  --gradient-primary: linear-gradient(135deg, #4a9eff 0%, #00d4ff 100%);
  --gradient-card: linear-gradient(135deg, #1a1f2e 0%, #141a28 100%);
  --shadow-glow: 0 0 20px rgba(74, 158, 255, 0.15);
  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.3);
  --radius: 12px;
  --radius-sm: 8px;
  --transition: 0.25s ease;
}

/* ===== Reset & Base ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  height: 100%;
  font-family: 'Segoe UI', 'Microsoft YaHei', 'PingFang SC', sans-serif;
  background: var(--bg-deep);
  color: var(--text-primary);
  overflow-x: hidden;
}

a { color: var(--accent-cyan); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--accent-blue); text-shadow: 0 0 10px var(--accent-cyan); }

/* ===== 粒子背景 ===== */
#particles-bg {
  position: fixed; top: 0; left: 0; width: 100%; height: 100%;
  z-index: 0; pointer-events: none;
}

/* ===== Page System ===== */
.page { display: none; position: relative; z-index: 1; min-height: 100vh; }
.page.active { display: flex; }

/* ===== 认证页 ===== */
.auth-page {
  align-items: center; justify-content: center;
  background: radial-gradient(ellipse at center, #1a2040 0%, var(--bg-deep) 70%);
}

.auth-container {
  position: relative; z-index: 2; width: 100%; max-width: 440px; padding: 20px;
}

.auth-card {
  background: var(--gradient-card);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 40px 32px;
  box-shadow: var(--shadow-card), var(--shadow-glow);
  backdrop-filter: blur(10px);
}

.auth-header { text-align: center; margin-bottom: 32px; }
.auth-icon { font-size: 56px; margin-bottom: 12px; animation: float 3s ease-in-out infinite; }

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

.auth-header h1 {
  font-size: 24px;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 6px;
}

.auth-version {
  font-size: 12px; color: var(--text-muted);
  font-family: 'Consolas', 'Courier New', monospace;
}

/* ===== 表单 ===== */
.auth-form { display: flex; flex-direction: column; gap: 16px; }

.input-group { display: flex; flex-direction: column; gap: 6px; }
.input-group label { font-size: 13px; color: var(--text-secondary); font-weight: 500; }
.input-group-row { flex-direction: row; gap: 10px; }
.input-group-row input { flex: 1; }

input, select, textarea {
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  padding: 10px 14px;
  font-size: 14px;
  transition: var(--transition);
  outline: none;
  font-family: inherit;
}

input:focus, select:focus, textarea:focus {
  border-color: var(--border-active);
  box-shadow: 0 0 0 3px rgba(74, 158, 255, 0.15);
}

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

/* ===== 按钮 ===== */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  padding: 10px 20px;
  font-size: 14px; font-weight: 600;
  border: none; border-radius: var(--radius-sm);
  cursor: pointer; transition: var(--transition);
  font-family: inherit;
  white-space: nowrap;
}

.btn:active { transform: scale(0.97); }

.btn-primary {
  background: var(--gradient-primary); color: #fff;
  box-shadow: 0 4px 15px rgba(74, 158, 255, 0.3);
}
.btn-primary:hover { box-shadow: 0 6px 25px rgba(74, 158, 255, 0.5); transform: translateY(-1px); }

.btn-block { width: 100%; }

.btn-outline {
  background: transparent; color: var(--accent-blue);
  border: 1px solid var(--accent-blue);
}
.btn-outline:hover { background: rgba(74, 158, 255, 0.1); }

.btn-danger {
  background: linear-gradient(135deg, #ff3d45, #e53935); color: #fff;
  box-shadow: 0 4px 15px rgba(255, 61, 69, 0.3);
}
.btn-danger:hover { box-shadow: 0 6px 25px rgba(255, 61, 69, 0.5); }

.btn-danger-outline {
  background: transparent; color: var(--accent-red);
  border: 1px solid var(--accent-red);
}
.btn-danger-outline:hover { background: rgba(255, 61, 69, 0.1); }

.btn-sm { padding: 6px 12px; font-size: 12px; }

.btn-icon { padding: 8px 12px; background: transparent; border: 1px solid var(--border); color: var(--text-secondary); border-radius: var(--radius-sm); cursor: pointer; }
.btn-icon:hover { background: var(--bg-card-hover); }

.btn-social {
  flex: 1; padding: 10px;
  font-size: 13px; font-weight: 500;
  border-radius: var(--radius-sm); border: 1px solid var(--border);
  background: var(--bg-input);
  color: var(--text-primary);
}
.btn-social:hover { background: var(--bg-card-hover); border-color: var(--border-active); }

.social-login { display: flex; gap: 10px; margin-top: 12px; }

.auth-switch { text-align: center; margin-top: 18px; font-size: 13px; color: var(--text-secondary); }

/* ===== 主界面导航 ===== */
.main-page { flex-direction: column; }

.top-nav {
  display: flex; align-items: center;
  padding: 0 24px; height: 56px;
  background: var(--bg-panel);
  border-bottom: 1px solid var(--border);
  box-shadow: 0 2px 12px rgba(0,0,0,0.3);
  z-index: 100; position: sticky; top: 0;
}

.nav-brand { font-size: 16px; font-weight: 700; margin-right: 32px; flex-shrink: 0; }
.nav-version { font-size: 11px; color: var(--text-muted); font-family: 'Consolas', monospace; margin-left: 6px; }

.nav-links { display: flex; gap: 4px; flex: 1; overflow-x: auto; }
.nav-link {
  padding: 8px 14px; border-radius: var(--radius-sm);
  font-size: 13px; font-weight: 500;
  color: var(--text-secondary); text-decoration: none;
  transition: var(--transition); white-space: nowrap;
}
.nav-link:hover, .nav-link.active {
  color: var(--accent-cyan);
  background: rgba(0, 212, 255, 0.1);
}

.nav-user { display: flex; align-items: center; gap: 10px; margin-left: 16px; }
.nav-user > span { font-size: 13px; color: var(--text-secondary); }

/* ===== 主内容区 ===== */
.main-content { flex: 1; padding: 24px; overflow-y: auto; position: relative; z-index: 2; }

.subpage { display: none; }
.subpage.active { display: block; }

.page-header {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 24px; flex-wrap: wrap; gap: 12px;
}
.page-header h2 { font-size: 22px; color: var(--text-primary); }

/* ===== 卡片 ===== */
.card {
  background: var(--gradient-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
  transition: var(--transition);
  overflow: hidden;
}
.card:hover { border-color: rgba(74, 158, 255, 0.3); }

.card-header {
  padding: 14px 18px;
  font-size: 14px; font-weight: 600;
  color: var(--text-primary);
  border-bottom: 1px solid var(--border);
  background: rgba(255,255,255,0.02);
}

.card-body { padding: 18px; }

/* ===== 仪表盘网格 ===== */
.dashboard-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
  margin-bottom: 24px;
}

.stat-card { text-align: center; }
.stat-card .card-body {
  font-size: 32px; font-weight: 700;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.stat-card .total-formula {
  font-size: 11px; color: var(--text-muted);
  margin-top: 6px; -webkit-text-fill-color: var(--text-muted);
}

.charts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(480px, 1fr));
  gap: 16px;
}

.chart-card .chart-container {
  padding: 16px;
  height: 360px;
  position: relative;
}
.chart-container canvas { width: 100% !important; height: 100% !important; }

/* ===== 排行榜 ===== */
.leaderboard-controls {
  display: flex; gap: 16px; flex-wrap: wrap;
}
.leaderboard-controls label {
  font-size: 13px; color: var(--text-secondary);
  display: flex; align-items: center; gap: 6px;
}
.leaderboard-controls select { padding: 6px 10px; font-size: 13px; }

.leaderboard-table-wrapper {
  max-height: 60vh; overflow-y: auto;
  border-radius: var(--radius);
  border: 1px solid var(--border);
}

.leaderboard-table {
  width: 100%; border-collapse: collapse;
}
.leaderboard-table th {
  background: var(--bg-panel); padding: 12px 16px;
  font-size: 12px; font-weight: 600;
  color: var(--text-secondary); text-align: left;
  position: sticky; top: 0; z-index: 1;
  border-bottom: 1px solid var(--border);
}
.leaderboard-table td {
  padding: 12px 16px; font-size: 13px;
  border-bottom: 1px solid rgba(42, 58, 92, 0.3);
}
.leaderboard-table tr:hover td { background: rgba(74, 158, 255, 0.05); }

.leaderboard-rank { font-weight: 700; color: var(--accent-cyan); }
.leaderboard-rank-1 { color: var(--accent-yellow); }
.leaderboard-rank-2 { color: #c0c0c0; }
.leaderboard-rank-3 { color: #cd7f32; }

.avatar-sm {
  width: 32px; height: 32px; border-radius: 50%;
  background: var(--gradient-primary);
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 12px; font-weight: 700; color: #fff;
  margin-right: 8px; vertical-align: middle;
}

.leaderboard-self {
  margin-top: 16px; padding: 14px 18px;
  background: rgba(74, 158, 255, 0.1);
  border: 1px solid var(--border-active);
  border-radius: var(--radius); font-size: 13px;
}

/* ===== AI会话 ===== */
.chat-layout { display: grid; grid-template-columns: 1fr 300px; gap: 16px; height: calc(100vh - 120px); }

.chat-main { display: flex; flex-direction: column; }
.chat-card { flex: 1; display: flex; flex-direction: column; }

.chat-messages {
  flex: 1; overflow-y: auto; padding: 16px;
  display: flex; flex-direction: column; gap: 12px;
}

.chat-msg { max-width: 80%; padding: 10px 14px; border-radius: 16px; font-size: 13px; line-height: 1.6; }
.chat-msg.user {
  align-self: flex-end;
  background: var(--gradient-primary);
  color: #fff;
  border-bottom-right-radius: 4px;
}
.chat-msg.ai {
  align-self: flex-start;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-bottom-left-radius: 4px;
}
.chat-msg.system {
  align-self: center;
  background: rgba(0, 230, 118, 0.1);
  border: 1px solid var(--accent-green);
  color: var(--accent-green);
  font-size: 12px;
  border-radius: var(--radius-sm);
}

.chat-input-area { padding: 12px 16px; border-top: 1px solid var(--border); }
.chat-input-row { display: flex; gap: 8px; align-items: center; }
.chat-input-row input { flex: 1; }

.chat-sidebar { overflow-y: auto; }

.badge { display: inline-block; padding: 2px 8px; border-radius: 20px; font-size: 11px; }
.badge-training { background: rgba(255, 145, 0, 0.15); color: var(--accent-orange); border: 1px solid var(--accent-orange); }

/* ===== 题库 ===== */
.subject-tabs { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 16px; }
.subject-tab {
  padding: 6px 14px; border-radius: 20px;
  font-size: 13px; font-weight: 500;
  background: transparent; border: 1px solid var(--border);
  color: var(--text-secondary); cursor: pointer; transition: var(--transition);
}
.subject-tab:hover, .subject-tab.active {
  background: var(--gradient-primary); color: #fff; border-color: transparent;
}

.knowledge-area {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); margin-bottom: 10px; overflow: hidden;
}
.ka-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 12px 16px; cursor: pointer;
  transition: var(--transition);
}
.ka-header:hover { background: var(--bg-card-hover); }
.ka-header-left { display: flex; align-items: center; gap: 10px; }
.ka-name { font-size: 14px; font-weight: 600; }
.ka-value { font-size: 14px; font-weight: 700; color: var(--accent-cyan); }
.ka-expand { font-size: 12px; color: var(--text-muted); transition: var(--transition); }

.ka-body { display: none; padding: 0 16px 16px; }
.ka-body.open { display: block; }
.ka-questions-table { width: 100%; border-collapse: collapse; font-size: 12px; }
.ka-questions-table th, .ka-questions-table td {
  padding: 6px 10px; text-align: left; border-bottom: 1px solid rgba(42,58,92,0.3);
}
.ka-questions-table th { color: var(--text-muted); font-weight: 500; }

.qb-actions { display: flex; gap: 10px; margin-top: 16px; flex-wrap: wrap; }

.qb-stats-section { margin-top: 24px; }

/* 难度标签 */
.diff-basic { color: var(--accent-green); }
.diff-medium { color: var(--accent-yellow); }
.diff-hard { color: var(--accent-orange); }
.diff-extreme { color: var(--accent-red); }

/* ===== 计划 ===== */
.plans-suggestions { margin-bottom: 24px; }

.plan-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 14px 18px;
  margin-bottom: 10px; transition: var(--transition);
  position: relative;
}
.plan-card:hover { border-color: rgba(74,158,255,0.3); }
.plan-card.completed {
  border-color: var(--accent-green);
  background: rgba(0, 230, 118, 0.05);
}
.plan-completed-tag {
  position: absolute; top: 8px; left: -2px;
  background: var(--accent-green); color: #000;
  font-size: 10px; font-weight: 700; padding: 2px 8px;
  border-radius: 0 4px 4px 0;
}
.plan-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 6px; }
.plan-title { font-size: 14px; font-weight: 600; }
.plan-deadline { font-size: 12px; color: var(--text-muted); }
.plan-deadline.urgent { color: var(--accent-red); }
.plan-info { font-size: 12px; color: var(--text-secondary); }
.plan-progress { margin-top: 8px; }
.plan-progress-bar {
  height: 6px; background: var(--bg-input);
  border-radius: 3px; overflow: hidden;
}
.plan-progress-fill {
  height: 100%; background: var(--gradient-primary);
  border-radius: 3px; transition: width 0.5s ease;
}
.plan-delete { position: absolute; top: 8px; right: 8px; cursor: pointer; opacity: 0.3; transition: var(--transition); font-size: 16px; }
.plan-delete:hover { opacity: 1; color: var(--accent-red); }

/* ===== 历史记录 ===== */
.history-stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-bottom: 24px;
}

.history-stat-panel {
  padding: 18px; border-radius: var(--radius);
  border: 1px solid var(--border);
}
.history-stat-panel h4 {
  font-size: 14px; margin-bottom: 12px;
  padding-bottom: 8px; border-bottom: 1px solid var(--border);
}
.history-stat-panel.problems h4 { color: var(--accent-cyan); }
.history-stat-panel.exams h4 { color: var(--accent-purple); }
.history-stat-panel.history-plans h4 { color: var(--accent-green); }

.history-events-list {
  max-height: 400px; overflow-y: auto;
}
.history-event {
  padding: 10px 14px; border-bottom: 1px solid rgba(42,58,92,0.3);
  font-size: 12px; display: flex; justify-content: space-between;
}
.history-event-time { color: var(--text-muted); white-space: nowrap; }
.history-event-detail { color: var(--text-secondary); }
.history-event-change.positive { color: var(--accent-green); }
.history-event-change.negative { color: var(--accent-red); }

.history-actions { margin-top: 16px; display: flex; gap: 10px; }

/* ===== 设置 ===== */
.settings-section {
  margin-bottom: 24px;
  padding: 18px;
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius);
}
.settings-section h3 { font-size: 16px; margin-bottom: 14px; }

.settings-danger { border-color: var(--accent-red); }
.settings-danger .btn { margin-right: 10px; }

.subject-checkboxes { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 10px; }
.subject-checkbox-item { display: flex; align-items: center; gap: 8px; font-size: 13px; }
.subject-checkbox-item input[type="checkbox"] { accent-color: var(--accent-blue); }
.subject-checkbox-item .score-input { width: 70px; padding: 4px 8px; font-size: 12px; }

/* ===== 模态框 ===== */
.modal-overlay {
  display: none; position: fixed; top: 0; left: 0; width: 100%; height: 100%;
  background: rgba(0,0,0,0.7); z-index: 1000;
  align-items: center; justify-content: center;
}
.modal-overlay.active { display: flex; }

.modal {
  background: var(--bg-panel); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 24px;
  max-width: 520px; width: 90%; max-height: 80vh; overflow-y: auto;
  box-shadow: 0 8px 40px rgba(0,0,0,0.5);
}
.modal h3 { font-size: 18px; margin-bottom: 16px; }
.modal-close {
  float: right; font-size: 20px; cursor: pointer;
  color: var(--text-muted); transition: var(--transition);
}
.modal-close:hover { color: var(--text-primary); }
.modal .form-row { margin-bottom: 12px; }
.modal .form-row label { display: block; font-size: 13px; color: var(--text-secondary); margin-bottom: 4px; }
.modal .form-row input, .modal .form-row select { width: 100%; }
.modal-actions { display: flex; gap: 10px; justify-content: flex-end; margin-top: 16px; }

.knowledge-checkboxes { max-height: 300px; overflow-y: auto; margin-bottom: 12px; }
.knowledge-checkbox-item { display: flex; align-items: center; gap: 8px; padding: 6px 0; font-size: 13px; }
.knowledge-checkbox-item input[type="checkbox"] { accent-color: var(--accent-blue); }

/* ===== Toast ===== */
.toast {
  position: fixed; top: 20px; right: 20px;
  padding: 12px 20px; border-radius: var(--radius-sm);
  font-size: 13px; font-weight: 500; z-index: 2000;
  transform: translateX(120%); transition: transform 0.3s ease;
  box-shadow: var(--shadow-card);
}
.toast.show { transform: translateX(0); }
.toast.success { background: rgba(0,230,118,0.15); border: 1px solid var(--accent-green); color: var(--accent-green); }
.toast.error { background: rgba(255,61,69,0.15); border: 1px solid var(--accent-red); color: var(--accent-red); }
.toast.info { background: rgba(74,158,255,0.15); border: 1px solid var(--accent-blue); color: var(--accent-blue); }

/* ===== 表格通用 ===== */
.form-row { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 12px; }

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

/* ===== 滚动条 ===== */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--bg-deep); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

/* ===== 动画 ===== */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}
.card, .plan-card { animation: fadeIn 0.4s ease; }

/* ===== 响应式 ===== */
@media (max-width: 768px) {
  .dashboard-grid { grid-template-columns: 1fr 1fr; }
  .charts-grid { grid-template-columns: 1fr; }
  .chat-layout { grid-template-columns: 1fr; }
  .history-stats-grid { grid-template-columns: 1fr; }
  .top-nav { padding: 0 10px; }
  .nav-links { gap: 0; }
  .nav-link { padding: 6px 8px; font-size: 11px; }
  .nav-brand { font-size: 13px; }
  .auth-card { padding: 24px 16px; }
}

/* === v2 新增：Modal === */
.modal-overlay { display: none; position: fixed; inset: 0; background: rgba(0,0,0,.6); z-index: 1000; align-items: center; justify-content: center; }
.modal-overlay.active { display: flex; }
.modal { background: var(--bg-card); border: 1px solid var(--border); border-radius: 12px; padding: 20px; max-width: 480px; width: 90%; max-height: 80vh; overflow-y: auto; box-shadow: 0 8px 32px rgba(0,0,0,.4); }
.modal-close { display: inline-block; float: right; cursor: pointer; font-size: 18px; color: var(--text-muted); }
.modal-close:hover { color: var(--accent-red); }
.modal .form-row { margin-bottom: 12px; }
.modal .form-row label { display: block; margin-bottom: 4px; font-size: 13px; color: var(--text-muted); }
.modal .form-row input, .modal .form-row select { width: 100%; padding: 8px 12px; background: var(--bg-deep); border: 1px solid var(--border); border-radius: 6px; color: var(--text-primary); font-size: 13px; }
.modal-actions { margin-top: 16px; gap: 8px; display: flex; justify-content: flex-end; }

/* === v2 新增：知识板块复选框 === */
.knowledge-checkboxes { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 8px; }
.knowledge-checkbox-item { display: flex; align-items: center; gap: 6px; padding: 4px 10px; background: var(--bg-deep); border-radius: 6px; cursor: pointer; font-size: 13px; color: var(--text-secondary); }
.knowledge-checkbox-item input[type="checkbox"] { accent-color: var(--accent-blue); }

/* === v2 新增：社交登录 === */
.social-login { display: flex; gap: 8px; margin-top: 12px; }
.btn-social { flex: 1; padding: 8px; border-radius: 8px; font-size: 13px; cursor: pointer; text-align: center; }
.btn-wechat { background: #07c160; color: #fff; border: none; }
.btn-qq { background: #12b7f5; color: #fff; border: none; }

/* === v2 新增：历史统计面板 === */
.history-stats-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin-bottom: 16px; }
.history-stat-panel { background: var(--bg-card); border: 1px solid var(--border); border-radius: 10px; padding: 14px; font-size: 13px; color: var(--text-secondary); }
.history-stat-panel h4 { margin-bottom: 8px; color: var(--text-primary); }
.history-stat-panel.problems { border-color: rgba(74,158,255,.3); }
.history-stat-panel.exams { border-color: rgba(255,145,0,.3); }
.history-stat-panel.history-plans { border-color: rgba(0,212,255,.3); }
.history-events { margin-top: 16px; }
.history-events h3 { margin-bottom: 8px; }
.history-events-list { max-height: 400px; overflow-y: auto; }
.history-event { display: flex; align-items: center; gap: 12px; padding: 8px 12px; border-bottom: 1px solid var(--border); font-size: 13px; }
.history-event-time { color: var(--text-muted); font-size: 11px; white-space: nowrap; }
.history-event-detail { color: var(--text-secondary); }
.history-event-change { font-weight: 600; }
.history-actions { margin-top: 16px; display: flex; gap: 8px; flex-wrap: wrap; }

/* === v2 新增：设置页 === */
.settings-section { background: var(--bg-card); border: 1px solid var(--border); border-radius: 10px; padding: 16px; margin-bottom: 12px; }
.settings-section h3 { margin-bottom: 12px; }
.settings-danger { border-color: rgba(255,61,69,.3); }
.subject-checkboxes { display: flex; flex-wrap: wrap; gap: 8px; }
.subject-checkbox-item { display: flex; align-items: center; gap: 6px; font-size: 13px; color: var(--text-secondary); }
.subject-checkbox-item input[type="checkbox"] { accent-color: var(--accent-blue); }
.score-input { width: 60px; padding: 2px 6px; background: var(--bg-deep); border: 1px solid var(--border); border-radius: 4px; color: var(--text-primary); text-align: center; }

/* === v2 新增：Chat 文件上传按钮 === */
.btn-icon { width: 36px; height: 36px; border-radius: 8px; background: var(--bg-deep); border: 1px solid var(--border); color: var(--text-secondary); cursor: pointer; font-size: 16px; display: flex; align-items: center; justify-content: center; }
.chat-input-row { display: flex; gap: 8px; align-items: center; }
.chat-input-row input { flex: 1; }

@media (max-width: 768px) {
  .history-stats-grid { grid-template-columns: 1fr; }
  .social-login { flex-direction: column; }
  .ai-config-row { flex-direction: column; align-items: stretch; }
  .ai-config-row input { max-width: 100%; }
}

/* === v2 新增：AI 模型配置（设置页） === */
.ai-config-hint { font-size: 13px; color: var(--text-muted); margin-bottom: 8px; }
.ai-config-hint a { color: var(--accent-blue); text-decoration: underline; }
.ai-config-row { display: flex; align-items: center; gap: 8px; }
.ai-config-row input { flex: 1; max-width: 420px; padding: 8px 12px; background: var(--bg-deep); border: 1px solid var(--border); border-radius: 6px; color: var(--text-primary); }

/* === ICP 备案号底部 === */
.icp-footer { text-align: center; padding: 16px 0; background: var(--bg-panel); border-top: 1px solid var(--border); }
.icp-footer a { color: var(--text-muted); font-size: 12px; text-decoration: none; }
.icp-footer a:hover { color: var(--accent-cyan); }