/* ==========================================================================
   粉笔复盘助手 - 现代化 UI 设计系统 v2.0
   ========================================================================== */

:root {
  /* 品牌色系：粉笔温暖活力珊瑚橙 */
  --primary: #ff5733;
  --primary-hover: #e64522;
  --primary-gradient: linear-gradient(135deg, #ff6b4a 0%, #ff4926 100%);
  --primary-gradient-subtle: linear-gradient(135deg, #fff3f0 0%, #fff8f6 100%);
  --primary-soft: #fff1ee;
  --primary-border: #ffd8d0;

  /* 功能语义色彩 */
  --secondary: #3b82f6;
  --secondary-soft: #eff6ff;
  --secondary-border: #bfdbfe;

  --success: #10b981;
  --success-dark: #059669;
  --success-soft: #ecfdf5;
  --success-border: #a7f3d0;

  --warning: #f59e0b;
  --warning-dark: #d97706;
  --warning-soft: #fffbeb;
  --warning-border: #fde68a;

  --danger: #ef4444;
  --danger-dark: #dc2626;
  --danger-soft: #fef2f2;
  --danger-border: #fecaca;

  --info: #64748b;
  --info-soft: #f1f5f9;
  --info-border: #e2e8f0;

  --purple: #8b5cf6;
  --purple-soft: #f5f3ff;
  --purple-border: #ddd6fe;

  /* 文字颜色体系 */
  --text-main: #0f172a;
  --text-body: #334155;
  --text-secondary: #64748b;
  --text-muted: #94a3b8;
  --text-light: #cbd5e1;

  /* 背景与表面 */
  --bg-body: #f8fafc;
  --bg-card: #ffffff;
  --bg-card-hover: #fafcfd;
  --bg-soft: #f1f5f9;
  --bg-input: #ffffff;

  /* 边框体系 */
  --border: #e2e8f0;
  --border-light: #edf2f7;
  --border-subtle: #f1f5f9;

  /* 圆角 */
  --radius-xs: 4px;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-xl: 20px;
  --radius-full: 9999px;

  /* 投影阴影 */
  --shadow-xs: 0 1px 2px rgba(15, 23, 42, 0.04);
  --shadow-sm: 0 2px 4px rgba(15, 23, 42, 0.04), 0 1px 2px rgba(15, 23, 42, 0.02);
  --shadow-md: 0 4px 16px -2px rgba(15, 23, 42, 0.06), 0 2px 6px -1px rgba(15, 23, 42, 0.03);
  --shadow-lg: 0 12px 30px -4px rgba(15, 23, 42, 0.08), 0 4px 12px -2px rgba(15, 23, 42, 0.04);
  --shadow-hover: 0 8px 24px -3px rgba(255, 87, 51, 0.12), 0 4px 8px -2px rgba(15, 23, 42, 0.04);

  /* 字体族 */
  --font-base: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, "SF Mono", "Sarasa Mono HC", Menlo, Monaco, Consolas, monospace;

  /* 尺寸限制 */
  --container-max: 1100px;
}

/* ==========================================================================
   全局基础重置
   ========================================================================== */

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-base);
  color: var(--text-body);
  background-color: var(--bg-body);
  line-height: 1.6;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: color 0.15s ease;
}

a:hover {
  color: var(--primary-hover);
}

img {
  max-width: 100%;
  height: auto;
  vertical-align: middle;
}

/* ==========================================================================
   统一顶部导航栏 (Navbar)
   ========================================================================== */

.app-navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  box-shadow: 0 1px 3px rgba(15, 23, 42, 0.03);
}

.nav-container {
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 20px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.nav-brand {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-main);
  text-decoration: none;
  flex-shrink: 0;
  transition: transform 0.15s ease;
}

.nav-brand:hover {
  color: var(--text-main);
  transform: scale(1.02);
}

.brand-icon {
  font-size: 1.3rem;
  line-height: 1;
}

.brand-tag {
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  padding: 1px 6px;
  border-radius: var(--radius-full);
  background: var(--primary-soft);
  color: var(--primary);
  letter-spacing: 0.5px;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 6px;
  overflow-x: auto;
  padding: 4px 0;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  border-radius: var(--radius-full);
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-secondary);
  text-decoration: none;
  white-space: nowrap;
  transition: all 0.18s ease;
}

.nav-link:hover {
  color: var(--primary);
  background: var(--primary-soft);
}

.nav-link.active {
  color: #ffffff;
  background: var(--primary-gradient);
  box-shadow: 0 2px 8px rgba(255, 87, 51, 0.25);
  font-weight: 600;
}

.nav-link .nav-icon {
  font-size: 1rem;
}

/* ==========================================================================
   页面容器与布局卡片
   ========================================================================== */

.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 24px 20px 48px;
}

.card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  padding: 24px;
  margin-bottom: 24px;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
  animation: fadeIn 0.35s ease both;
}

.card-hover:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: var(--primary-border);
}

/* ==========================================================================
   通用按钮体系
   ========================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 8px 16px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  font-size: 0.875rem;
  font-weight: 500;
  line-height: 1.4;
  cursor: pointer;
  background: #ffffff;
  color: var(--text-body);
  transition: all 0.18s ease;
  text-decoration: none;
  user-select: none;
  white-space: nowrap;
}

.btn:hover {
  border-color: var(--primary);
  color: var(--primary);
  box-shadow: var(--shadow-sm);
  transform: translateY(-1px);
}

.btn:active {
  transform: translateY(1px);
}

.btn-primary {
  background: var(--primary-gradient);
  color: #ffffff;
  border-color: transparent;
  box-shadow: 0 2px 6px rgba(255, 87, 51, 0.2);
}

.btn-primary:hover {
  color: #ffffff;
  box-shadow: 0 4px 12px rgba(255, 87, 51, 0.35);
  filter: brightness(1.03);
}

.btn-soft {
  background: var(--primary-soft);
  color: var(--primary);
  border-color: var(--primary-border);
}

.btn-soft:hover {
  background: var(--primary);
  color: #ffffff;
}

.btn-sm {
  padding: 5px 12px;
  font-size: 0.8rem;
  border-radius: var(--radius-sm);
}

/* ==========================================================================
   标签与徽章体系
   ========================================================================== */

.tag {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 10px;
  border-radius: var(--radius-full);
  font-size: 0.76rem;
  font-weight: 500;
  line-height: 1.35;
  white-space: nowrap;
  border: 1px solid transparent;
}

.tag-primary {
  background: var(--secondary-soft);
  color: var(--secondary);
  border-color: var(--secondary-border);
}

.tag-success {
  background: var(--success-soft);
  color: var(--success-dark);
  border-color: var(--success-border);
}

.tag-warning {
  background: var(--warning-soft);
  color: var(--warning-dark);
  border-color: var(--warning-border);
}

.tag-danger {
  background: var(--danger-soft);
  color: var(--danger-dark);
  border-color: var(--danger-border);
}

.tag-info {
  background: var(--info-soft);
  color: var(--text-secondary);
  border-color: var(--info-border);
}

.tag-gray {
  background: var(--bg-soft);
  color: var(--text-secondary);
  border-color: var(--border);
}

.tag-note {
  background: var(--purple-soft);
  color: var(--purple);
  border-color: var(--purple-border);
}

.tag-method {
  background: #fff7ed;
  color: #c2410c;
  border-color: #ffedd5;
}

.tag-acc {
  background: var(--success-soft);
  color: var(--success-dark);
  border-color: var(--success-border);
}

.tag-rethink {
  background: var(--danger-soft);
  color: var(--danger-dark);
  border-color: var(--danger-border);
}

.tag-word {
  cursor: pointer;
  background: #f8fafc;
  color: var(--text-body);
  border: 1px dashed var(--border);
  transition: all 0.15s ease;
}

.tag-word:hover {
  background: var(--primary-soft);
  color: var(--primary);
  border-style: solid;
  border-color: var(--primary);
}

/* ==========================================================================
   KPI 统计卡片与指标区 (Stat Dashboard)
   ========================================================================== */

.stat-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin: 20px 0 24px;
}

.stat-card {
  background: var(--bg-card);
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  padding: 18px 16px;
  text-align: center;
  box-shadow: var(--shadow-xs);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.stat-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.stat-card.danger {
  border-top: 3px solid var(--danger);
}

.stat-card.warning {
  border-top: 3px solid var(--warning);
}

.stat-card.success {
  border-top: 3px solid var(--success);
}

.stat-card.info {
  border-top: 3px solid var(--secondary);
}

.stat-num {
  font-size: 2rem;
  font-weight: 700;
  line-height: 1.1;
  font-family: var(--font-mono);
  letter-spacing: -0.5px;
}

.stat-card.danger .stat-num { color: var(--danger); }
.stat-card.warning .stat-num { color: var(--warning); }
.stat-card.success .stat-num { color: var(--success); }
.stat-card.info .stat-num { color: var(--secondary); }

.stat-title {
  color: var(--text-secondary);
  font-size: 0.82rem;
  font-weight: 500;
  margin-top: 6px;
}

/* ==========================================================================
   交互式题目筛选栏 (Filter Bar)
   ========================================================================== */

.filter-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  padding: 12px 16px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  margin-bottom: 24px;
  box-shadow: var(--shadow-xs);
}

.filter-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: var(--radius-full);
  font-size: 0.84rem;
  font-weight: 500;
  color: var(--text-secondary);
  background: var(--bg-soft);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.15s ease;
  user-select: none;
}

.filter-pill:hover {
  color: var(--text-main);
  background: #e2e8f0;
}

.filter-pill.active {
  background: var(--text-main);
  color: #ffffff;
  font-weight: 600;
}

.filter-count {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 6px;
  font-size: 0.72rem;
  border-radius: var(--radius-full);
  background: rgba(0, 0, 0, 0.08);
}

.filter-pill.active .filter-count {
  background: rgba(255, 255, 255, 0.25);
  color: #ffffff;
}

/* ==========================================================================
   题目复盘卡片 (Question Card)
   ========================================================================== */

.quz-item {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-xs);
  margin-bottom: 20px;
  overflow: hidden;
  transition: all 0.2s ease;
  animation: fadeIn 0.3s ease both;
}

.quz-item:hover {
  box-shadow: var(--shadow-sm);
  border-color: #cbd5e1;
}

/* 题目头部状态条 */
.quz-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 18px;
  cursor: pointer;
  user-select: none;
  transition: background 0.15s ease;
  border-bottom: 1px solid var(--border-light);
}

.quz-title.wrong {
  background: #fff5f5;
  border-left: 4px solid var(--danger);
}

.quz-title.timeout {
  background: #fffcf0;
  border-left: 4px solid var(--warning);
}

.quz-title.correct {
  background: #f4fbf7;
  border-left: 4px solid var(--success);
}

.quz-title:hover {
  filter: brightness(0.98);
}

.quz-title-left {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 1;
  min-width: 0;
}

.quz-num-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  background: var(--text-main);
  color: #ffffff;
  flex-shrink: 0;
}

.quz-source-name {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-main);
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
}

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

.quz-status-badge {
  font-size: 0.78rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: var(--radius-full);
}

.status-badge-wrong {
  background: var(--danger-soft);
  color: var(--danger-dark);
}

.status-badge-timeout {
  background: var(--warning-soft);
  color: var(--warning-dark);
}

.status-badge-correct {
  background: var(--success-soft);
  color: var(--success-dark);
}

.chevron-icon {
  font-size: 0.75rem;
  color: var(--text-muted);
  transition: transform 0.2s ease;
}

.chevron-icon.folded {
  transform: rotate(-90deg);
}

/* 材料区 */
.quz-material {
  background: #f8fafc;
  border-left: 3px solid var(--secondary);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  padding: 14px 18px;
  margin: 16px 20px 0;
  font-size: 0.95rem;
  line-height: 1.75;
  color: var(--text-body);
}

.quz-material-label {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--secondary);
  text-transform: uppercase;
  margin-bottom: 6px;
  display: flex;
  align-items: center;
  gap: 4px;
}

/* 题干内容区 */
.quz-content-fold {
  padding: 18px 20px;
}

.quz-content {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--text-main);
  margin-bottom: 16px;
}

/* 选项列表 (现代化选项卡片) */
.quz-options {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin: 14px 0 6px;
}

.quz-opt-card {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 10px 14px;
  border-radius: var(--radius-md);
  background: var(--bg-soft);
  border: 1px solid var(--border);
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--text-body);
  transition: all 0.15s ease;
}

.quz-opt-letter {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: #ffffff;
  border: 1px solid var(--border);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-secondary);
  flex-shrink: 0;
  margin-top: 1px;
}

.quz-opt-text {
  flex: 1;
}

.quz-opt-tag {
  font-size: 0.72rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  margin-left: auto;
  white-space: nowrap;
}

/* 选项状态高亮 */
.quz-opt-card.opt-wrong {
  background: var(--danger-soft);
  border-color: var(--danger-border);
  color: var(--danger-dark);
}

.quz-opt-card.opt-wrong .quz-opt-letter {
  background: var(--danger);
  border-color: var(--danger);
  color: #ffffff;
}

.quz-opt-card.opt-wrong .quz-opt-tag {
  background: var(--danger);
  color: #ffffff;
}

.quz-opt-card.opt-correct {
  background: var(--success-soft);
  border-color: var(--success-border);
  color: var(--success-dark);
}

.quz-opt-card.opt-correct .quz-opt-letter {
  background: var(--success);
  border-color: var(--success);
  color: #ffffff;
}

.quz-opt-card.opt-correct .quz-opt-tag {
  background: var(--success);
  color: #ffffff;
}

/* 题目操作栏 */
.quz-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px 14px;
  border-top: 1px solid var(--border-light);
  background: #fafbfc;
  flex-wrap: wrap;
}

.quz-action-btn {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  background: #ffffff;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  font-size: 0.82rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s ease;
  user-select: none;
  text-decoration: none;
}

.quz-action-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: var(--primary-soft);
}

.quz-action-btn.active {
  background: var(--primary-soft);
  border-color: var(--primary-border);
  color: var(--primary);
  font-weight: 600;
}

/* 解析与笔记展开面板 */
.quz-panel {
  padding: 18px 20px;
  border-top: 1px solid var(--border);
  background: #fcfdfe;
}

.solution-panel {
  background: #f8fafc;
  line-height: 1.8;
  font-size: 0.95rem;
}

.solution-answer-row {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 12px;
  padding-bottom: 10px;
  border-bottom: 1px dashed var(--border);
  font-size: 0.9rem;
}

/* ==========================================================================
   分类视图卡片与树结构 (Category Complex View)
   ========================================================================== */

.section-block {
  margin-bottom: 28px;
}

.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
  padding-left: 4px;
}

.section-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-main);
}

.section-bar {
  width: 4px;
  height: 18px;
  border-radius: 2px;
  background: var(--primary);
}

.cat-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-xs);
  padding: 20px;
}

.cat-record-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 12px;
  border-radius: var(--radius-md);
  margin-bottom: 4px;
  cursor: pointer;
  transition: all 0.15s ease;
}

.cat-record-row:hover {
  background: var(--bg-soft);
  transform: translateX(3px);
}

.cat-record-title {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-main);
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
}

.cat-record-chips {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

.chip-rate {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: var(--radius-full);
}

.chip-rate.high {
  background: var(--success-soft);
  color: var(--success-dark);
}

.chip-rate.mid {
  background: var(--warning-soft);
  color: var(--warning-dark);
}

.chip-rate.low {
  background: var(--danger-soft);
  color: var(--danger-dark);
}

/* ==========================================================================
   悬浮目录导航 (Floating TOC)
   ========================================================================== */

.toc {
  position: fixed;
  top: 76px;
  left: 20px;
  width: 190px;
  max-height: calc(100vh - 96px);
  overflow-y: auto;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  padding: 14px 12px;
  z-index: 100;
  list-style: none;
}

.toc::-webkit-scrollbar {
  width: 4px;
}

.toc::-webkit-scrollbar-thumb {
  background: #cbd5e1;
  border-radius: 2px;
}

.toc-header {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-main);
  padding: 0 4px 8px;
  border-bottom: 1px solid var(--border-light);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.toc-li {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 8px;
  border-radius: var(--radius-sm);
  font-size: 0.82rem;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.12s ease;
}

.toc-li:hover {
  background: var(--bg-soft);
  color: var(--primary);
}

.toc-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

.toc-dot.wrong { background: var(--danger); }
.toc-dot.timeout { background: var(--warning); }
.toc-dot.correct { background: var(--success); }

/* ==========================================================================
   回到顶部
   ========================================================================== */

.back-to-top {
  position: fixed;
  right: 0;
  bottom: calc(20px + env(safe-area-inset-bottom, 0px));
  width: 20px;
  height: 46px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(255, 87, 51, 0.32);
  border-right: 0;
  border-radius: 10px 0 0 10px;
  background: rgba(255, 255, 255, 0.68);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  color: var(--primary);
  font-size: 0.95rem;
  font-weight: 700;
  line-height: 1;
  box-shadow: var(--shadow-lg);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: translateX(6px);
  transition: opacity 0.2s ease, transform 0.2s ease, visibility 0.2s ease, width 0.2s ease, height 0.2s ease, color 0.15s ease, border-color 0.15s ease, background-color 0.15s ease;
  z-index: 1030;
}

.back-to-top.show {
  opacity: 0.5;
  visibility: visible;
  pointer-events: auto;
  transform: translateX(0);
}

.back-to-top:hover {
  opacity: 1;
  width: 40px;
  height: 52px;
  color: var(--primary);
  border-color: var(--primary);
  background: rgba(255, 255, 255, 0.92);
}

.back-to-top:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

/* ==========================================================================
   动画与关键帧
   ========================================================================== */

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ==========================================================================
   响应式调整
   ========================================================================== */

@media (max-width: 1360px) {
  .toc {
    display: none;
  }
}

@media (max-width: 768px) {
  html {
    font-size: 15px;
  }
  .back-to-top {
    right: 0;
    bottom: calc(14px + env(safe-area-inset-bottom, 0px));
    width: 16px;
    height: 42px;
    font-size: 0.85rem;
  }
  .container {
    padding: 16px 12px 36px;
  }
  .stat-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
  }
  .nav-container {
    padding: 0 12px;
    height: auto;
    flex-direction: column;
    align-items: stretch;
    padding-top: 8px;
    padding-bottom: 8px;
  }
  .nav-menu {
    justify-content: space-between;
    width: 100%;
  }
  .nav-link {
    padding: 6px 10px;
    font-size: 0.82rem;
  }
  .quz-title {
    flex-direction: column;
    align-items: flex-start;
  }
  .quz-title-right {
    width: 100%;
    justify-content: flex-end;
  }
}

/* 触屏设备：扩大关键点击区域，避免只有 hover 才能发现 */
@media (pointer: coarse) {
  .nav-link {
    padding: 10px 14px;
  }
  .back-to-top {
    width: 30px;
    height: 56px;
  }
  .back-to-top span {
    font-size: 1.15rem;
  }
}

/* 复盘状态 */
.review-badge {
  display: inline-flex;
  align-items: center;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  background: var(--bg-soft);
  color: var(--text-secondary);
  font-size: 0.72rem;
  font-weight: 600;
  white-space: nowrap;
}

.review-badge.reviewing {
  background: var(--warning-soft);
  color: var(--warning-dark);
}

.review-badge.mastered {
  background: var(--success-soft);
  color: var(--success-dark);
}