/* ==================== 全局样式 ==================== */
:root {
  --primary: #1a73e8;
  --primary-light: #e8f0fe;
  --primary-dark: #1557b0;
  --success: #34a853;
  --warning: #fbbc04;
  --danger: #ea4335;
  --text-primary: #202124;
  --text-secondary: #5f6368;
  --text-light: #80868b;
  --bg-primary: #ffffff;
  --bg-secondary: #f8f9fa;
  --bg-tertiary: #f1f3f4;
  --border-color: #dadce0;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.1);
  --shadow-md: 0 2px 8px rgba(0,0,0,0.12);
  --shadow-lg: 0 4px 16px rgba(0,0,0,0.15);
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --transition: all 0.2s ease;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  background: var(--bg-secondary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
}

/* ==================== 顶部导航 ==================== */
.top-header {
  background: linear-gradient(135deg, #1a237e 0%, #283593 50%, #1565c0 100%);
  color: white;
  padding: 0;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 12px rgba(0,0,0,0.2);
}

.header-inner {
  max-width: 1440px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 24px;
}

.logo-area {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo-icon {
  width: 40px;
  height: 40px;
  background: rgba(255,255,255,0.15);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
}

.logo-text h1 {
  font-size: 18px;
  font-weight: 600;
  letter-spacing: 0.5px;
}

.logo-text p {
  font-size: 12px;
  opacity: 0.8;
  margin-top: 1px;
}

/* 标签导航 */
.tab-nav {
  display: flex;
  gap: 4px;
  background: rgba(255,255,255,0.1);
  border-radius: 10px;
  padding: 4px;
}

.tab-btn {
  padding: 8px 20px;
  border: none;
  background: transparent;
  color: rgba(255,255,255,0.8);
  font-size: 14px;
  font-weight: 500;
  border-radius: 8px;
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
}

.tab-btn:hover {
  background: rgba(255,255,255,0.15);
  color: white;
}

.tab-btn.active {
  background: white;
  color: var(--primary);
  font-weight: 600;
}

/* ==================== 主内容区 ==================== */
.main-content {
  max-width: 1440px;
  margin: 0 auto;
  padding: 20px 24px 40px;
}

.tab-panel {
  display: none;
}

.tab-panel.active {
  display: block;
}

/* ==================== 卡片通用 ==================== */
.card {
  background: var(--bg-primary);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
  overflow: hidden;
  margin-bottom: 20px;
}

.card-header {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-secondary);
}

.card-header h3 {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.card-body {
  padding: 20px;
}

/* ==================== 筛选栏 ==================== */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: flex-end;
  padding: 16px 20px;
  background: var(--bg-primary);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
  margin-bottom: 20px;
}

.filter-group {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.filter-group label {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.filter-group select,
.filter-group input {
  padding: 8px 12px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-size: 14px;
  color: var(--text-primary);
  background: white;
  min-width: 140px;
  transition: var(--transition);
}

.filter-group select:focus,
.filter-group input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(26,115,232,0.15);
}

/* ==================== 宏观对比看板 ==================== */

/* 试卷选择卡片 */
.exam-selector {
  display: flex;
  gap: 16px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.exam-select-card {
  flex: 1;
  min-width: 200px;
  max-width: 280px;
  padding: 14px 16px;
  border: 2px solid var(--border-color);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: var(--transition);
  position: relative;
}

.exam-select-card:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-md);
}

.exam-select-card.selected {
  border-color: var(--primary);
  background: var(--primary-light);
}

.exam-select-card .exam-badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 11px;
  font-weight: 600;
  margin-bottom: 6px;
}

.exam-select-card .exam-name {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 4px;
}

.exam-select-card .exam-meta {
  font-size: 12px;
  color: var(--text-secondary);
}

/* 对比表格 */
.comparison-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

.comparison-table th,
.comparison-table td {
  padding: 12px 14px;
  text-align: left;
  border-bottom: 1px solid var(--border-color);
}

.comparison-table th {
  background: var(--bg-tertiary);
  font-weight: 600;
  color: var(--text-secondary);
  font-size: 13px;
  white-space: nowrap;
  position: sticky;
  left: 0;
  z-index: 1;
}

.comparison-table th:first-child {
  min-width: 160px;
  border-right: 2px solid var(--border-color);
}

.comparison-table td:first-child {
  font-weight: 500;
  background: var(--bg-secondary);
  border-right: 2px solid var(--border-color);
  min-width: 160px;
}

.comparison-table .row-category {
  background: var(--bg-tertiary);
  font-weight: 600;
  font-size: 13px;
  color: var(--text-secondary);
}

.comparison-table .row-category td {
  padding: 8px 14px;
}

/* 难度星级 */
.difficulty-stars {
  display: flex;
  align-items: center;
  gap: 6px;
}

.stars {
  color: #fbbc04;
  letter-spacing: 2px;
}

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

/* 标签 */
.tag {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 12px;
  font-size: 12px;
  font-weight: 500;
  margin: 2px 3px;
}

.tag-green {
  background: #e6f4ea;
  color: #137333;
}

.tag-red {
  background: #fce8e6;
  color: #c5221f;
}

.tag-yellow {
  background: #fef7e0;
  color: #b06000;
}

.tag-blue {
  background: #e8f0fe;
  color: #174ea6;
}

.tag-purple {
  background: #f3e8fd;
  color: #7627bb;
}

/* 知识模块占比条 */
.dist-bar-container {
  display: flex;
  align-items: center;
  gap: 10px;
}

.dist-bar {
  flex: 1;
  height: 8px;
  background: var(--bg-tertiary);
  border-radius: 4px;
  overflow: hidden;
}

.dist-bar-fill {
  height: 100%;
  border-radius: 4px;
  transition: width 0.5s ease;
}

.dist-value {
  font-size: 13px;
  font-weight: 600;
  min-width: 40px;
  text-align: right;
}

/* 能力画像雷达区域 */
.ability-section {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}

.ability-card {
  flex: 1;
  min-width: 250px;
  padding: 16px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
}

.ability-card h4 {
  font-size: 14px;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-color);
}

.ability-list {
  list-style: none;
}

.ability-list li {
  padding: 6px 0;
  font-size: 13px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.ability-list li::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--primary);
  flex-shrink: 0;
}

/* 试卷详情卡片网格 */
.exam-detail-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
  margin-top: 16px;
}

.exam-detail-card {
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: var(--transition);
}

.exam-detail-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.exam-detail-header {
  padding: 12px 16px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: white;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.exam-detail-header h4 {
  font-size: 15px;
  font-weight: 600;
}

.exam-detail-body {
  padding: 14px 16px;
}

.exam-detail-row {
  display: flex;
  justify-content: space-between;
  padding: 5px 0;
  font-size: 13px;
  border-bottom: 1px solid #f0f0f0;
}

.exam-detail-row:last-child {
  border-bottom: none;
}

.exam-detail-row .label {
  color: var(--text-secondary);
}

.exam-detail-row .value {
  font-weight: 500;
}

/* ==================== 微观热力图 ==================== */

.heatmap-controls {
  display: flex;
  gap: 12px;
  align-items: flex-end;
  flex-wrap: wrap;
  margin-bottom: 20px;
}

/* 热力图矩阵 */
.heatmap-matrix {
  overflow-x: auto;
}

.heatmap-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
  min-width: 800px;
}

.heatmap-table th {
  padding: 10px 12px;
  background: var(--bg-tertiary);
  font-weight: 600;
  color: var(--text-secondary);
  font-size: 12px;
  text-align: center;
  border: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 1;
}

.heatmap-table td {
  padding: 10px 12px;
  border: 1px solid var(--border-color);
  vertical-align: top;
}

.heatmap-table .q-number {
  text-align: center;
  font-weight: 700;
  font-size: 15px;
  color: var(--text-primary);
  background: var(--bg-secondary);
  min-width: 50px;
}

.heatmap-table .q-cell {
  min-width: 140px;
  position: relative;
  transition: var(--transition);
}

.heatmap-table .q-cell:hover {
  background: var(--primary-light);
}

.q-knowledge {
  font-weight: 500;
  margin-bottom: 2px;
}

.q-id {
  font-size: 11px;
  color: var(--text-light);
  font-family: 'Consolas', 'Monaco', monospace;
}

.q-new-tag {
  display: inline-block;
  background: var(--danger);
  color: white;
  font-size: 10px;
  padding: 1px 5px;
  border-radius: 3px;
  margin-left: 4px;
  font-weight: 600;
}

/* 热度追踪列 */
.heatmap-table .tracking-cell {
  min-width: 200px;
  background: #fafbfc;
}

.frequency-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px 8px;
  border-radius: 10px;
  font-size: 12px;
  font-weight: 600;
  margin: 2px 2px;
}

.freq-high {
  background: #e6f4ea;
  color: #137333;
  border: 1px solid #ceead6;
}

.freq-medium {
  background: #fef7e0;
  color: #b06000;
  border: 1px solid #fde293;
}

.freq-low {
  background: #fce8e6;
  color: #c5221f;
  border: 1px solid #f9d0cb;
}

.teaching-note {
  font-size: 12px;
  color: var(--text-secondary);
  margin-top: 6px;
  padding-top: 6px;
  border-top: 1px dashed var(--border-color);
  line-height: 1.5;
}

.teaching-note strong {
  color: var(--text-primary);
}

/* 热力颜色背景 */
.heat-high { background-color: rgba(52, 168, 83, 0.08); }
.heat-medium { background-color: rgba(251, 188, 4, 0.08); }
.heat-low { background-color: rgba(234, 67, 53, 0.05); }

/* ==================== 搜索导出系统 ==================== */
.search-container {
  display: flex;
  gap: 12px;
  margin-bottom: 20px;
}

.search-input-wrapper {
  flex: 1;
  position: relative;
}

.search-input-wrapper input {
  width: 100%;
  padding: 12px 16px 12px 44px;
  border: 2px solid var(--border-color);
  border-radius: var(--radius-md);
  font-size: 15px;
  transition: var(--transition);
}

.search-input-wrapper input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(26,115,232,0.12);
}

.search-icon {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 18px;
  color: var(--text-light);
}

.search-btn {
  padding: 12px 24px;
  background: var(--primary);
  color: white;
  border: none;
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}

.search-btn:hover {
  background: var(--primary-dark);
}

/* 搜索结果 */
.search-results {
  margin-top: 16px;
}

.search-result-item {
  display: flex;
  align-items: center;
  padding: 12px 16px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  margin-bottom: 8px;
  transition: var(--transition);
  gap: 12px;
}

.search-result-item:hover {
  border-color: var(--primary);
  background: var(--primary-light);
}

.search-result-item input[type="checkbox"] {
  width: 18px;
  height: 18px;
  accent-color: var(--primary);
  cursor: pointer;
}

.result-info {
  flex: 1;
}

.result-label {
  font-size: 14px;
  font-weight: 500;
}

.result-id {
  font-size: 12px;
  color: var(--text-light);
  font-family: 'Consolas', 'Monaco', monospace;
  margin-top: 2px;
}

.result-category {
  font-size: 12px;
  padding: 2px 8px;
  border-radius: 10px;
  background: var(--bg-tertiary);
  color: var(--text-secondary);
}

/* 导出栏 */
.export-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: white;
  border-top: 2px solid var(--border-color);
  padding: 12px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  z-index: 200;
  box-shadow: 0 -2px 12px rgba(0,0,0,0.1);
  transform: translateY(100%);
  transition: transform 0.3s ease;
}

.export-bar.visible {
  transform: translateY(0);
}

.export-bar .selected-count {
  font-size: 14px;
  font-weight: 600;
  color: var(--primary);
}

.export-bar .export-ids {
  flex: 1;
  margin: 0 20px;
  padding: 8px 12px;
  background: var(--bg-secondary);
  border-radius: var(--radius-sm);
  font-family: 'Consolas', 'Monaco', monospace;
  font-size: 13px;
  color: var(--text-primary);
  overflow-x: auto;
  white-space: nowrap;
}

.export-btn {
  padding: 10px 24px;
  background: var(--success);
  color: white;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}

.export-btn:hover {
  background: #2d9249;
}

.copy-btn {
  padding: 10px 16px;
  background: var(--primary);
  color: white;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  margin-left: 8px;
  transition: var(--transition);
}

.copy-btn:hover {
  background: var(--primary-dark);
}

/* 知识点统计面板 */
.kp-stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 12px;
  margin-top: 16px;
}

.kp-stat-card {
  padding: 14px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: var(--transition);
}

.kp-stat-card:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-md);
}

.kp-stat-card .kp-name {
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 6px;
}

.kp-stat-card .kp-count {
  font-size: 24px;
  font-weight: 700;
  color: var(--primary);
}

.kp-stat-card .kp-count span {
  font-size: 13px;
  font-weight: 400;
  color: var(--text-secondary);
}

/* ==================== 知识点分布堆叠条 ==================== */
.stacked-bar {
  display: flex;
  height: 24px;
  border-radius: 6px;
  overflow: hidden;
  margin: 8px 0;
}

.stacked-bar .segment {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  font-weight: 600;
  color: white;
  transition: flex 0.5s ease;
  min-width: 0;
}

.stacked-bar .segment:hover {
  filter: brightness(1.1);
}

.stacked-legend {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-top: 8px;
}

.stacked-legend .legend-item {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: var(--text-secondary);
}

.stacked-legend .legend-dot {
  width: 10px;
  height: 10px;
  border-radius: 3px;
}

/* ==================== 统计概览卡片 ==================== */
.stats-overview {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 12px;
  margin-bottom: 20px;
}

.stat-card {
  background: var(--bg-primary);
  border-radius: var(--radius-md);
  padding: 16px;
  border: 1px solid var(--border-color);
  text-align: center;
}

.stat-card .stat-value {
  font-size: 28px;
  font-weight: 700;
  color: var(--primary);
}

.stat-card .stat-label {
  font-size: 13px;
  color: var(--text-secondary);
  margin-top: 4px;
}

/* ==================== 空状态 ==================== */
.empty-state {
  text-align: center;
  padding: 60px 20px;
  color: var(--text-light);
}

.empty-state .empty-icon {
  font-size: 48px;
  margin-bottom: 16px;
}

.empty-state h3 {
  font-size: 18px;
  margin-bottom: 8px;
  color: var(--text-secondary);
}

.empty-state p {
  font-size: 14px;
}

/* ==================== Toast 提示 ==================== */
.toast {
  position: fixed;
  top: 80px;
  right: 24px;
  padding: 12px 20px;
  background: #323232;
  color: white;
  border-radius: var(--radius-md);
  font-size: 14px;
  z-index: 1000;
  opacity: 0;
  transform: translateX(100px);
  transition: all 0.3s ease;
  box-shadow: var(--shadow-lg);
}

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

.toast.success { background: var(--success); }
.toast.error { background: var(--danger); }

/* ==================== 分隔线与标题 ==================== */
.section-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.section-title::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border-color);
  margin-left: 8px;
}

.divider {
  border: none;
  border-top: 1px solid var(--border-color);
  margin: 20px 0;
}

/* ==================== 响应式 ==================== */
@media (max-width: 768px) {
  .header-inner {
    flex-direction: column;
    gap: 12px;
  }

  .tab-nav {
    width: 100%;
    justify-content: center;
  }

  .main-content {
    padding: 16px;
  }

  .filter-bar {
    flex-direction: column;
  }

  .exam-selector {
    flex-direction: column;
  }

  .exam-select-card {
    max-width: 100%;
  }

  .search-container {
    flex-direction: column;
  }

  .export-bar {
    flex-wrap: wrap;
    gap: 8px;
  }

  .export-bar .export-ids {
    order: 3;
    margin: 0;
    width: 100%;
  }
}

/* ==================== 动画 ==================== */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.fade-in {
  animation: fadeIn 0.3s ease forwards;
}

/* 知识点分布可视化 */
.dist-visual {
  margin-top: 16px;
}

.dist-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
}

.dist-row .dist-label {
  min-width: 80px;
  font-size: 13px;
  font-weight: 500;
  text-align: right;
}

.dist-row .dist-bar-track {
  flex: 1;
  height: 20px;
  background: var(--bg-tertiary);
  border-radius: 4px;
  overflow: hidden;
  position: relative;
}

.dist-row .dist-bar-inner {
  height: 100%;
  border-radius: 4px;
  transition: width 0.6s ease;
  display: flex;
  align-items: center;
  padding-left: 8px;
  font-size: 12px;
  font-weight: 600;
  color: white;
}

.dist-row .dist-percent {
  min-width: 45px;
  font-size: 13px;
  font-weight: 600;
  text-align: left;
}

/* 选中高亮 */
.highlight-row {
  background: var(--primary-light) !important;
}

/* 知识点标签云 */
.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 16px;
}

.tag-cloud .cloud-tag {
  padding: 6px 14px;
  border: 1px solid var(--border-color);
  border-radius: 20px;
  font-size: 13px;
  cursor: pointer;
  transition: var(--transition);
  background: white;
}

.tag-cloud .cloud-tag:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: var(--primary-light);
}

.tag-cloud .cloud-tag.active {
  background: var(--primary);
  color: white;
  border-color: var(--primary);
}

.tag-cloud .cloud-tag .tag-count {
  font-size: 11px;
  opacity: 0.7;
  margin-left: 4px;
}

/* 2026-06-16 教研云题库可读性增强 */
.module-pill {
  display: inline-flex;
  align-items: center;
  padding: 1px 7px;
  border: 1px solid currentColor;
  border-radius: 999px;
  background: #fff;
  font-size: 11px;
  font-weight: 700;
  margin-right: 6px;
  white-space: nowrap;
}

.q-content {
  margin-top: 8px;
  padding: 10px 12px;
  background: #fff;
  border: 1px solid #e8eaed;
  border-radius: 8px;
  color: var(--text-primary);
  font-size: 14px;
  line-height: 1.75;
  white-space: normal;
  word-break: break-word;
}

.q-content.compact {
  font-size: 12px;
  line-height: 1.55;
  max-height: 88px;
  overflow: hidden;
  background: rgba(255,255,255,0.72);
}

.q-images {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 8px;
}

.q-thumb {
  max-width: 180px;
  max-height: 120px;
  object-fit: contain;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  background: #fff;
}

.heatmap-table {
  min-width: 1160px;
}

.heatmap-table .q-cell {
  min-width: 260px;
  max-width: 360px;
}

.search-result-item {
  align-items: flex-start;
  background: #fff;
}

.result-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 6px;
  color: var(--text-secondary);
  font-size: 12px;
}

.result-meta > span:not(.module-pill) {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 999px;
  padding: 1px 8px;
}

.tag-cloud {
  max-height: 260px;
  overflow: auto;
  padding-right: 4px;
}

.cloud-tag {
  margin-bottom: 6px;
}

@media (max-width: 900px) {
  .header-inner { flex-direction: column; align-items: stretch; gap: 12px; }
  .tab-nav { overflow-x: auto; }
  .search-container { flex-direction: column; }
  .export-bar { flex-direction: column; align-items: stretch; gap: 8px; }
  .export-bar .export-ids { margin: 0; }
}

/* 2026-06-16 structured question cards */
.question-card {
  background: #ffffff;
  border: 1px solid #dfe3ea;
  border-radius: 12px;
  box-shadow: 0 1px 4px rgba(15, 23, 42, 0.06);
  overflow: hidden;
  min-width: 0;
}

.question-card.compact {
  border-radius: 10px;
  box-shadow: none;
}

.question-card-head {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
  padding: 9px 10px;
  background: linear-gradient(180deg, #f8fafc 0%, #eef3f8 100%);
  border-bottom: 1px solid #e5e7eb;
}

.question-card-head .kp-name {
  font-weight: 700;
  color: #111827;
}

.question-card-head .q-no {
  margin-left: auto;
  color: #64748b;
  font-size: 12px;
  font-weight: 700;
}

.question-card-body {
  padding: 12px 13px;
  font-size: 14px;
  line-height: 1.8;
  color: #1f2937;
  background: #fff;
  white-space: normal;
  word-break: break-word;
}

.question-card.compact .question-card-body {
  font-size: 12px;
  line-height: 1.6;
  max-height: 98px;
  overflow: hidden;
  padding: 10px;
}

.question-card-foot {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding: 8px 10px;
  border-top: 1px solid #eef2f7;
  background: #fbfdff;
}

.question-card-foot span {
  padding: 1px 7px;
  border-radius: 999px;
  border: 1px solid #e5e7eb;
  background: #f8fafc;
  color: #475569;
  font-size: 11px;
}

.q-answer {
  padding: 0 12px 12px;
  color: #374151;
  font-size: 13px;
}

.q-answer summary {
  cursor: pointer;
  color: var(--primary);
  font-weight: 700;
  margin-bottom: 6px;
}

.search-result-item .question-card {
  margin-top: 10px;
}

.heatmap-table .q-cell {
  min-width: 320px;
  max-width: 420px;
}

/* 2026-06-16 第二轮：检索筛选与阅读节奏 */
.search-filter-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  margin: -8px 0 16px;
  padding: 12px;
  background: linear-gradient(180deg, #f8fbff, #fff);
  border: 1px solid #e4ebf7;
  border-radius: 12px;
}

.search-filter-row select {
  min-width: 140px;
  padding: 8px 10px;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  background: #fff;
  color: var(--text-primary);
}

.ghost-btn {
  padding: 8px 14px;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  background: #fff;
  color: var(--text-secondary);
  cursor: pointer;
  font-weight: 600;
}

.ghost-btn:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: var(--primary-light);
}

.result-summary {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 12px;
  align-items: center;
  margin-bottom: 14px;
  padding: 12px 14px;
  border: 1px solid #d7e3ff;
  border-radius: 12px;
  background: #f7faff;
  color: var(--text-secondary);
  font-size: 14px;
}

.result-summary strong {
  color: var(--primary-dark);
}

.result-summary span {
  font-size: 12px;
  color: var(--text-light);
}

.result-group-title {
  position: sticky;
  top: 74px;
  z-index: 5;
  background: rgba(248,249,250,.96);
  backdrop-filter: blur(8px);
  padding: 10px 0 8px;
  border-bottom: 1px solid var(--border-color);
}

.result-group-title span {
  font-size: 12px;
  font-weight: 500;
  color: var(--text-light);
  margin-left: 8px;
}

.search-result-item input[type="checkbox"] {
  margin-top: 18px;
  transform: scale(1.15);
}

.exam-selector {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  max-height: 520px;
  overflow: auto;
  padding-right: 4px;
}

.exam-select-card {
  max-width: none;
  min-width: 0;
}

.exam-select-card .exam-name {
  line-height: 1.35;
}

.card-header {
  position: relative;
}

@media (max-width: 900px) {
  .search-filter-row select,
  .ghost-btn { width: 100%; }
  .result-group-title { top: 116px; }
}

/* 2026-06-16 微观追踪：右侧教研列固定 + 题图/公式可读尺寸 */
.heatmap-matrix {
  position: relative;
  max-height: calc(100vh - 230px);
  overflow: auto;
}

.heatmap-table {
  border-collapse: separate;
  border-spacing: 0;
}

.heatmap-table .tracking-header,
.heatmap-table .tracking-cell {
  position: sticky;
  right: 0;
  width: 280px;
  min-width: 280px;
  max-width: 280px;
  z-index: 4;
  box-shadow: -8px 0 14px rgba(15, 23, 42, 0.08);
}

.heatmap-table .tracking-header {
  z-index: 8;
  background: #eef3f8;
}

.heatmap-table .tracking-cell {
  background: #fbfcff;
}

.question-card-body .math-inline {
  display: inline-flex;
  align-items: center;
  max-width: 100%;
  margin: 0 2px;
  padding: 0 4px;
  border-radius: 4px;
  background: #f4f7fb;
  color: #111827;
  font-family: 'Times New Roman', 'Cambria Math', serif;
  line-height: 1.45;
  vertical-align: baseline;
  word-break: break-word;
}

.question-card-body img,
.question-inline-img,
.q-thumb {
  width: 180px;
  height: 120px;
  max-width: 100%;
  object-fit: contain;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  background: #fff;
  vertical-align: middle;
}

.question-card.compact .question-card-body img,
.question-card.compact .question-inline-img,
.question-card.compact .q-thumb {
  width: 120px;
  height: 80px;
}

.question-card-body table {
  max-width: 100%;
  border-collapse: collapse;
  margin: 6px 0;
}

.question-card-body td,
.question-card-body th {
  border: 1px solid #dfe3ea;
  padding: 3px 6px;
}

/* 2026-06-16 题目结构化渲染组件：paper card + LaTeX + media rail */
:root {
  --paper-bg: #fffdf8;
  --ink-strong: #152033;
  --ink-muted: #667085;
  --card-line: #e7dcc7;
}

.question-card {
  position: relative;
  overflow: hidden;
  border: 1px solid rgba(31, 41, 55, 0.10);
  border-radius: 18px;
  background:
    linear-gradient(135deg, rgba(255,255,255,0.96), rgba(252,248,238,0.92)),
    radial-gradient(circle at 0 0, color-mix(in srgb, var(--module-color, #1a73e8) 16%, transparent), transparent 34%);
  box-shadow: 0 12px 34px rgba(15, 23, 42, 0.10), 0 1px 0 rgba(255,255,255,0.9) inset;
  min-width: 0;
}

.question-card::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 5px;
  background: var(--module-color, #1a73e8);
}

.question-card-head {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: center;
  gap: 12px;
  padding: 14px 16px 12px 18px;
  background: transparent;
  border-bottom: 1px solid rgba(31, 41, 55, 0.08);
}

.question-index-mark {
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  border-radius: 14px;
  background: color-mix(in srgb, var(--module-color, #1a73e8) 14%, #ffffff);
  color: var(--module-color, #1a73e8);
  border: 1px solid color-mix(in srgb, var(--module-color, #1a73e8) 30%, #ffffff);
  font-weight: 900;
  letter-spacing: -0.04em;
}

.question-title-stack {
  min-width: 0;
}

.question-kicker {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 4px;
}

.question-card .module-pill {
  display: inline-flex;
  align-items: center;
  padding: 2px 8px;
  border: 1px solid color-mix(in srgb, var(--module-color, #1a73e8) 40%, #ffffff);
  border-radius: 999px;
  background: color-mix(in srgb, var(--module-color, #1a73e8) 9%, #ffffff);
  color: var(--module-color, #1a73e8);
  font-size: 11px;
  font-weight: 800;
  white-space: nowrap;
}

.question-card-head .kp-name {
  color: var(--ink-strong);
  font-size: 16px;
  line-height: 1.25;
  font-weight: 850;
  letter-spacing: -0.01em;
}

.question-card-main {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 14px;
  padding: 14px 16px 12px 18px;
}

.question-stem-block {
  min-width: 0;
  border: 1px solid rgba(31,41,55,0.08);
  border-radius: 14px;
  background: rgba(255,255,255,0.78);
  box-shadow: 0 1px 0 rgba(255,255,255,0.9) inset;
}

.block-label {
  display: inline-flex;
  margin: 10px 0 0 12px;
  padding: 2px 7px;
  border-radius: 7px;
  background: #f1f5f9;
  color: #64748b;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.08em;
}

.question-card-body {
  padding: 9px 13px 13px;
  font-size: 15px;
  line-height: 1.95;
  color: #182235;
  background: transparent;
  white-space: normal;
  word-break: break-word;
}

.question-card-body p { margin: 0.25em 0; }
.question-card-body p + p { margin-top: 0.7em; }

.question-card-body .math-inline {
  display: inline-flex;
  align-items: center;
  max-width: 100%;
  margin: 0 3px;
  padding: 1px 5px;
  border-radius: 6px;
  background: #fff7ed;
  color: #111827;
  border: 1px solid #fed7aa;
  font-family: KaTeX_Main, 'Times New Roman', 'Cambria Math', serif;
  line-height: 1.5;
  vertical-align: baseline;
  word-break: break-word;
}

.question-card-body .katex {
  font-size: 1.06em;
}

.q-images {
  display: grid;
  grid-auto-flow: row;
  gap: 10px;
  margin: 0;
  align-content: start;
}

.q-media-frame {
  margin: 0;
  padding: 8px;
  border-radius: 14px;
  background: #ffffff;
  border: 1px solid rgba(31,41,55,0.10);
  box-shadow: 0 8px 22px rgba(15, 23, 42, 0.08);
}

.question-card-body img,
.question-inline-img,
.q-thumb {
  display: block;
  width: 190px;
  height: 126px;
  max-width: 100%;
  object-fit: contain;
  border: 0;
  border-radius: 10px;
  background: #fff;
  vertical-align: middle;
}

.question-card-foot {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding: 0 16px 14px 18px;
  border-top: 0;
  background: transparent;
}

.question-card-foot span {
  padding: 3px 8px;
  border-radius: 999px;
  border: 1px solid rgba(100,116,139,0.18);
  background: rgba(248,250,252,0.86);
  color: var(--ink-muted);
  font-size: 11px;
  font-weight: 650;
}

.q-answer {
  margin: 0 16px 16px 18px;
  padding: 0;
  border: 1px solid #dbeafe;
  border-radius: 14px;
  background: #f8fbff;
  color: #1e3a5f;
  font-size: 13px;
  overflow: hidden;
}

.q-answer summary {
  cursor: pointer;
  padding: 10px 12px;
  color: #1d4ed8;
  font-weight: 850;
  background: #eff6ff;
  margin: 0;
}

.answer-block {
  padding: 10px 12px;
  border-top: 1px solid #dbeafe;
}

.answer-block strong {
  display: inline-flex;
  margin-bottom: 4px;
  color: #1e40af;
}

.answer-block p {
  margin: 0;
  line-height: 1.7;
}

/* compact matrix cells keep the same structure but reduce density */
.question-card.compact {
  border-radius: 14px;
  box-shadow: 0 3px 12px rgba(15,23,42,0.07);
}

.question-card.compact .question-card-head {
  gap: 8px;
  padding: 10px 10px 8px 12px;
}

.question-card.compact .question-index-mark {
  width: 34px;
  height: 34px;
  border-radius: 11px;
  font-size: 12px;
}

.question-card.compact .question-card-head .kp-name {
  font-size: 13px;
}

.question-card.compact .question-card-main {
  grid-template-columns: 1fr;
  gap: 8px;
  padding: 9px 10px 9px 12px;
}

.question-card.compact .question-card-body {
  font-size: 12px;
  line-height: 1.65;
  max-height: 118px;
  overflow: hidden;
  padding: 7px 9px 9px;
}

.question-card.compact .block-label {
  margin: 7px 0 0 9px;
  font-size: 10px;
}

.question-card.compact .q-images {
  grid-template-columns: repeat(auto-fit, minmax(92px, 1fr));
}

.question-card.compact .q-media-frame {
  padding: 5px;
  border-radius: 10px;
}

.question-card.compact .question-card-body img,
.question-card.compact .question-inline-img,
.question-card.compact .q-thumb {
  width: 116px;
  height: 76px;
}

.question-card.compact .question-card-foot {
  padding: 0 10px 10px 12px;
  gap: 4px;
}

.question-card.compact .question-card-foot span {
  font-size: 10px;
  padding: 2px 6px;
}

.search-result-item {
  border: 0;
  border-radius: 18px;
  background: linear-gradient(180deg, #ffffff, #f8fafc);
  box-shadow: 0 8px 30px rgba(15, 23, 42, 0.07);
  padding: 14px;
}

.search-result-item input[type="checkbox"] {
  margin-top: 22px;
}

.result-label {
  font-size: 13px;
  color: #334155;
  font-weight: 800;
}

@media (max-width: 780px) {
  .question-card-main { grid-template-columns: 1fr; }
  .q-images { grid-template-columns: repeat(auto-fit, minmax(120px, 1fr)); }
  .question-card-body img, .question-inline-img, .q-thumb { width: 150px; height: 100px; }
}

/* 2026-06-16 分层检索模式 */
.search-mode-switch {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 6px;
  padding: 6px;
  margin: 0 0 12px;
  border: 1px solid #dbe5f5;
  border-radius: 14px;
  background: linear-gradient(180deg, #f8fbff, #eef4ff);
}

.search-mode-switch::after {
  content: attr(data-hint);
  flex-basis: 100%;
  padding: 2px 8px 0;
  color: #64748b;
  font-size: 12px;
}

.search-mode {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 12px;
  border-radius: 10px;
  color: #475569;
  font-size: 13px;
  font-weight: 800;
  cursor: pointer;
  transition: 0.18s ease;
  user-select: none;
}

.search-mode input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.search-mode.active {
  color: #0f172a;
  background: #ffffff;
  box-shadow: 0 6px 16px rgba(15, 23, 42, 0.10), 0 0 0 1px rgba(26, 115, 232, 0.16) inset;
}

.search-mode:hover {
  background: rgba(255,255,255,0.72);
}

/* 2026-06-16 final UI audit: unified rhythm, accessible controls, cleaner export state */
:root {
  --surface: #ffffff;
  --surface-soft: #f8fafc;
  --surface-tint: #f6f9ff;
  --line-soft: #e3e8f0;
  --focus-ring: 0 0 0 4px rgba(26,115,232,0.14);
  --shadow-card: 0 10px 28px rgba(15,23,42,0.07);
}

button,
select,
input,
[role="button"] {
  font: inherit;
}

button:focus-visible,
select:focus-visible,
input:focus-visible,
[role="button"]:focus-visible,
.search-mode:focus-within {
  outline: none;
  box-shadow: var(--focus-ring);
}

.card,
.filter-bar,
.stat-card {
  border-color: var(--line-soft);
  box-shadow: 0 1px 2px rgba(15,23,42,0.04);
}

.card-header {
  min-height: 56px;
  background: linear-gradient(180deg, #fbfdff, #f5f7fb);
}

.filter-bar {
  gap: 14px;
  background: linear-gradient(180deg, #ffffff, #f8fbff);
}

.filter-group select,
.filter-group input,
.search-filter-row select,
.search-input-wrapper input {
  border-color: #d5dce8;
}

.exam-select-card,
.tag-cloud .cloud-tag,
.ghost-btn,
.search-mode,
.result-checkbox {
  -webkit-tap-highlight-color: transparent;
}

.exam-select-card:focus-visible,
.exam-select-card.selected {
  border-color: var(--primary);
  box-shadow: var(--focus-ring), 0 8px 20px rgba(26,115,232,0.08);
}

.exam-select-card .exam-name {
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  min-height: 2.7em;
}

.tag-cloud {
  padding: 14px 16px 18px;
}

.tag-cloud .cloud-tag {
  line-height: 1.35;
}

.tag-cloud .cloud-tag:focus-visible {
  border-color: var(--primary);
  color: var(--primary);
  background: var(--primary-light);
}

.search-mode-switch {
  display: flex;
  width: 100%;
  align-items: center;
  margin-bottom: 14px;
}

.search-mode-switch::after {
  width: 100%;
}

.search-mode.active {
  color: var(--primary-dark);
}

.search-filter-row {
  margin-top: -4px;
  border-color: var(--line-soft);
}

.result-summary {
  border-color: #cfe0ff;
  background: linear-gradient(180deg, #f8fbff, #eef5ff);
}

.result-group-title {
  top: 77px;
  margin-top: 18px;
  padding: 12px 0 9px;
}

.search-result-item {
  display: grid;
  grid-template-columns: 28px minmax(0, 1fr);
  align-items: start;
  gap: 12px;
  border: 1px solid rgba(31,41,55,0.08);
  box-shadow: var(--shadow-card);
}

.search-result-item input[type="checkbox"] {
  margin-top: 25px;
}

.result-meta {
  margin-bottom: 8px;
}

.question-card {
  box-shadow: 0 8px 24px rgba(15,23,42,0.08), 0 1px 0 rgba(255,255,255,0.92) inset;
}

.question-card.compact {
  box-shadow: 0 2px 10px rgba(15,23,42,0.06);
}

.question-card-body {
  overflow-wrap: anywhere;
}

.question-card-body .math-inline {
  overflow-x: auto;
}

.heatmap-matrix {
  border-radius: 0 0 var(--radius-lg) var(--radius-lg);
}

.heatmap-table th {
  background: #eef3f8;
}

.heatmap-table .tracking-header,
.heatmap-table .tracking-cell {
  border-left: 1px solid #d8e1ec;
}

.export-bar {
  visibility: hidden;
  pointer-events: none;
}

.export-bar.visible {
  visibility: visible;
  pointer-events: auto;
}

.export-bar button:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

body.has-export-bar .main-content {
  padding-bottom: 112px;
}

@media (max-width: 900px) {
  .search-mode-switch { align-items: stretch; }
  .search-mode { flex: 1 1 110px; justify-content: center; }
  .search-container { gap: 10px; }
  .result-group-title { top: 118px; }
  .search-result-item { grid-template-columns: 24px minmax(0, 1fr); padding: 12px; }
  .question-card-head { grid-template-columns: 1fr; }
}

@media (max-width: 560px) {
  .main-content { padding: 12px; }
  .card-body { padding: 14px; }
  .tab-btn { padding: 8px 12px; }
  .logo-text h1 { font-size: 16px; }
  .logo-text p { display: none; }
  .stats-overview { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .filter-group,
  .filter-group select,
  .filter-group input,
  .search-filter-row select,
  .ghost-btn { width: 100%; min-width: 0; }
  .question-index-mark { width: 36px; height: 36px; }
  .question-card-head .kp-name { font-size: 14px; }
}

/* 2026-06-16 macro selector: no nested card-wall scrollbar */
.exam-selector {
  display: block;
  max-height: none;
  overflow: visible;
  padding-right: 0;
}

.exam-selector-summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
  padding: 12px 14px;
  border: 1px solid #d7e3ff;
  border-radius: 12px;
  background: linear-gradient(180deg, #f8fbff, #eef5ff);
  color: var(--text-secondary);
  font-size: 13px;
}

.exam-selector-summary strong {
  color: var(--primary-dark);
  font-size: 15px;
}

.exam-selector-summary span {
  display: block;
  margin-top: 2px;
  color: var(--text-light);
  font-size: 12px;
}

.exam-selector-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px;
}

.exam-selector-more-hint {
  margin-top: 12px;
  padding: 10px 12px;
  border-radius: 10px;
  background: #fff7ed;
  color: #9a3412;
  font-size: 12px;
  border: 1px solid #fed7aa;
}

.ghost-btn.compact {
  width: auto;
  white-space: nowrap;
  padding: 7px 12px;
}

@media (max-width: 700px) {
  .exam-selector-summary {
    align-items: stretch;
    flex-direction: column;
  }
  .ghost-btn.compact {
    width: 100%;
  }
}

/* 2026-06-16 heatmap board readability pass: no sticky overlay, no clipped questions */
.heatmap-matrix {
  max-height: none;
  overflow: visible;
}

#heatmap-container {
  min-width: 0;
}

.heatmap-board {
  display: grid;
  gap: 18px;
  min-width: 0;
}

.heatmap-row-card {
  display: grid;
  gap: 14px;
  padding: 16px;
  border: 1px solid #dbe5f5;
  border-radius: 20px;
  background: linear-gradient(180deg, #ffffff, #f8fbff);
  box-shadow: 0 10px 30px rgba(15, 23, 42, 0.06);
  min-width: 0;
}

.heatmap-row-head {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.heatmap-q-number {
  width: 48px;
  height: 48px;
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  border-radius: 16px;
  background: #0f172a;
  color: #fff;
  font-size: 15px;
  font-weight: 900;
  letter-spacing: -0.03em;
}

.heatmap-row-head h4 {
  margin: 0;
  color: #0f172a;
  font-size: 16px;
  font-weight: 900;
}

.heatmap-row-head p {
  margin: 3px 0 0;
  color: #64748b;
  font-size: 12px;
}

.heatmap-exam-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 320px), 1fr));
  gap: 14px;
  min-width: 0;
}

.heatmap-exam-card {
  min-width: 0;
  padding: 10px;
  border: 1px solid rgba(148, 163, 184, 0.26);
  border-radius: 18px;
  background: rgba(255,255,255,0.92);
}

.heatmap-exam-card.heat-high { background: linear-gradient(180deg, rgba(230,244,234,0.76), rgba(255,255,255,0.96)); }
.heatmap-exam-card.heat-medium { background: linear-gradient(180deg, rgba(254,247,224,0.82), rgba(255,255,255,0.96)); }
.heatmap-exam-card.heat-low { background: linear-gradient(180deg, rgba(252,232,230,0.68), rgba(255,255,255,0.96)); }

.heatmap-exam-card.is-empty {
  display: grid;
  align-content: start;
  min-height: 120px;
  color: #94a3b8;
  background: #f8fafc;
}

.heatmap-exam-label {
  display: inline-flex;
  width: fit-content;
  max-width: 100%;
  margin-bottom: 8px;
  padding: 4px 9px;
  border-radius: 999px;
  background: #eef4ff;
  color: #31547f;
  font-size: 12px;
  font-weight: 850;
  white-space: normal;
}

.heatmap-empty-slot {
  display: grid;
  place-items: center;
  min-height: 74px;
  border: 1px dashed #cbd5e1;
  border-radius: 14px;
  color: #94a3b8;
  font-weight: 800;
}

.heatmap-tracking-panel {
  min-width: 0;
  padding: 12px 14px;
  border: 1px solid #e2e8f0;
  border-radius: 16px;
  background: #fbfdff;
}

.heatmap-tracking-panel > strong {
  display: block;
  margin-bottom: 8px;
  color: #0f172a;
  font-size: 13px;
}

.heatmap-frequency-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.heatmap-muted {
  color: #94a3b8;
  font-size: 12px;
}

#heatmap-container .question-card.compact .question-card-body {
  max-height: none;
  overflow: visible;
}

#heatmap-container .question-card.compact {
  height: auto;
}

#heatmap-container .question-card.compact .question-card-main,
#heatmap-container .question-card.compact .question-card-foot {
  min-width: 0;
}

@media (max-width: 900px) {
  .heatmap-row-card { padding: 12px; border-radius: 16px; }
  .heatmap-exam-grid { grid-template-columns: 1fr; }
}

/* 2026-06-16 heatmap horizontal comparison table: table semantics without overlay/clipping */
.heatmap-matrix {
  max-height: none;
  overflow: visible;
}

#heatmap-container {
  min-width: 0;
}

.heatmap-table-shell {
  width: 100%;
  max-width: 100%;
  overflow-x: auto;
  overflow-y: visible;
  padding-bottom: 8px;
  border: 1px solid #dbe5f5;
  border-radius: 18px;
  background: #ffffff;
  box-shadow: 0 10px 28px rgba(15, 23, 42, 0.06);
}

.heatmap-table.compare-table {
  width: max-content;
  min-width: 100%;
  table-layout: fixed;
  border-collapse: separate;
  border-spacing: 0;
  font-size: 13px;
}

.heatmap-table.compare-table th,
.heatmap-table.compare-table td {
  position: static !important;
  left: auto !important;
  right: auto !important;
  top: auto !important;
  z-index: auto !important;
  box-shadow: none !important;
  vertical-align: top;
  border: 1px solid #e2e8f0;
}

.heatmap-table.compare-table th {
  padding: 12px 14px;
  background: #f1f5f9;
  color: #334155;
  font-size: 12px;
  font-weight: 900;
  white-space: normal;
}

.heatmap-table.compare-table .q-number-header,
.heatmap-table.compare-table .q-number {
  width: 72px;
  min-width: 72px;
  max-width: 72px;
  text-align: center;
  background: #f8fafc;
}

.heatmap-table.compare-table .q-number {
  color: #0f172a;
  font-size: 15px;
  font-weight: 900;
  padding-top: 18px;
}

.heatmap-table.compare-table .exam-header,
.heatmap-table.compare-table .q-cell {
  width: 360px;
  min-width: 360px;
  max-width: 360px;
}

.heatmap-table.compare-table .tracking-header,
.heatmap-table.compare-table .tracking-cell {
  width: 260px;
  min-width: 260px;
  max-width: 260px;
  background: #fbfdff;
}

.heatmap-table.compare-table .q-cell {
  padding: 10px;
  background-clip: padding-box;
}

.heatmap-table.compare-table .empty-cell {
  color: #94a3b8;
  text-align: center;
  font-size: 20px;
  font-weight: 800;
  background: #f8fafc;
}

.heatmap-table.compare-table .question-card {
  height: auto;
  min-width: 0;
}

.heatmap-table.compare-table .question-card.compact .question-card-body {
  max-height: none;
  overflow: visible;
}

.heatmap-table.compare-table .question-card.compact .question-card-main {
  grid-template-columns: 1fr;
}

.heatmap-table.compare-table .question-card.compact .question-card-foot,
.heatmap-table.compare-table .question-card.compact .question-title-stack,
.heatmap-table.compare-table .question-card.compact .question-stem-block {
  min-width: 0;
}

.heatmap-frequency-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.heatmap-muted {
  color: #94a3b8;
  font-size: 12px;
}

@media (max-width: 900px) {
  .heatmap-table.compare-table .exam-header,
  .heatmap-table.compare-table .q-cell {
    width: 320px;
    min-width: 320px;
    max-width: 320px;
  }
}

/* 2026-06-16 heatmap: fixed left summary column (question number + conclusion) */
.heatmap-table.compare-table .row-summary-header,
.heatmap-table.compare-table .row-summary-cell {
  position: sticky !important;
  left: 0 !important;
  right: auto !important;
  z-index: 6 !important;
  width: 280px;
  min-width: 280px;
  max-width: 280px;
  background: linear-gradient(180deg, #f8fbff, #eef5ff);
  box-shadow: 8px 0 16px rgba(15, 23, 42, 0.10) !important;
}

.heatmap-table.compare-table .row-summary-header {
  z-index: 8 !important;
  color: #0f172a;
  text-align: left;
}

.heatmap-table.compare-table .row-summary-cell {
  padding: 14px;
  vertical-align: top;
}

.row-summary-q {
  display: inline-grid;
  place-items: center;
  width: 46px;
  height: 46px;
  margin-bottom: 10px;
  border-radius: 15px;
  background: #0f172a;
  color: #ffffff;
  font-size: 15px;
  font-weight: 950;
  letter-spacing: -0.03em;
}

.row-summary-title {
  margin-bottom: 8px;
  color: #334155;
  font-size: 12px;
  font-weight: 900;
}

.heatmap-table.compare-table .row-summary-cell .teaching-note {
  margin-top: 10px;
  background: rgba(255,255,255,0.78);
}

.heatmap-table.compare-table .tracking-header,
.heatmap-table.compare-table .tracking-cell,
.heatmap-table.compare-table .q-number-header,
.heatmap-table.compare-table .q-number {
  display: none;
}

@media (max-width: 900px) {
  .heatmap-table.compare-table .row-summary-header,
  .heatmap-table.compare-table .row-summary-cell {
    width: 240px;
    min-width: 240px;
    max-width: 240px;
  }
}

/* ==================== 2026-06-21 redesign: 对齐 homework 中性色系 ==================== */
:root {
  --primary: #4f46e5;
  --primary-light: #eef2ff;
  --primary-dark: #4338ca;
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-light: #94a3b8;
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-tertiary: #f1f5f9;
  --border-color: #e2e8f0;
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.04);
  --shadow-md: 0 4px 12px rgba(15, 23, 42, 0.06);
  --shadow-lg: 0 10px 24px rgba(15, 23, 42, 0.08);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --transition: all 0.18s ease;
  --focus-ring: 0 0 0 3px rgba(79, 70, 229, 0.15);
}

body {
  background: var(--bg-secondary);
  color: var(--text-primary);
}

/* ---- Header: 去渐变，浅色 + 品牌色 ---- */
.top-header {
  background: #ffffff;
  color: var(--text-primary);
  box-shadow: 0 1px 0 var(--border-color);
}

.header-inner {
  padding: 12px 24px;
  gap: 16px;
}

.logo-icon {
  background: linear-gradient(135deg, #4f46e5 0%, #7c3aed 100%);
  color: #fff;
  font-size: 16px;
  font-weight: 700;
  border-radius: 10px;
}

.logo-text h1 {
  color: var(--text-primary);
  font-size: 17px;
  letter-spacing: 0;
}

.logo-text p {
  color: var(--text-light);
  opacity: 1;
  margin-top: 0;
}

.tab-nav {
  background: transparent;
  border-radius: 0;
  padding: 0;
  gap: 2px;
}

.tab-btn {
  color: var(--text-secondary);
  padding: 8px 14px;
  border-radius: 8px;
  background: transparent;
  font-weight: 500;
}

.tab-btn:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

.tab-btn.active {
  background: var(--primary-light);
  color: var(--primary);
  font-weight: 600;
}

/* ---- Layout shell: 2 列 + 右侧 drawer ---- */
.app-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 20px;
  max-width: 1440px;
  margin: 0 auto;
  padding: 20px 24px 40px;
  align-items: start;
}

.app-shell .main-content {
  max-width: none;
  margin: 0;
  padding: 0;
  min-width: 0;
}

body.has-export-bar .main-content {
  padding-bottom: 0;
}

/* ---- Export drawer (替换原底部固定栏) ---- */
.export-bar {
  position: static;
  transform: none;
  visibility: visible;
  pointer-events: auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 16px;
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 84px;
  min-height: 220px;
}

.export-bar.visible {
  transform: none;
}

.export-bar[aria-hidden="true"] {
  opacity: 0.55;
}

.export-bar > .drawer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 10px;
}

.export-bar > .drawer-header h4 {
  margin: 0;
  font-size: 12px;
  font-weight: 700;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.6px;
}

.export-bar > .drawer-header .drawer-pill {
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 999px;
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  font-weight: 600;
}

.export-bar .drawer-stat {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.export-bar .drawer-count {
  font-size: 32px;
  font-weight: 700;
  color: var(--primary);
  font-variant-numeric: tabular-nums;
  line-height: 1;
}

.export-bar .drawer-count-label {
  font-size: 12px;
  color: var(--text-light);
}

.export-bar .drawer-ids-title {
  font-size: 11px;
  font-weight: 600;
  color: var(--text-light);
  text-transform: uppercase;
  letter-spacing: 0.4px;
  margin-bottom: -4px;
}

.export-bar .export-ids {
  font-family: 'Consolas', 'Monaco', monospace;
  font-size: 12px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 8px 10px;
  max-height: 240px;
  overflow-y: auto;
  word-break: break-all;
  color: var(--text-primary);
  line-height: 1.55;
  margin: 0;
  white-space: normal;
}

.export-bar .export-ids.empty {
  color: var(--text-light);
  font-family: inherit;
  text-align: center;
  padding: 18px 10px;
  font-style: normal;
  font-size: 12px;
  background: var(--bg-secondary);
}

.export-bar .drawer-actions {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.export-bar .drawer-actions button {
  width: 100%;
  padding: 9px 14px;
  font-size: 13px;
  font-weight: 600;
  border-radius: 8px;
  border: none;
  cursor: pointer;
  transition: var(--transition);
}

.export-bar .drawer-actions .copy-btn {
  background: var(--primary);
  color: #fff;
  padding: 12px 24px;
  font-size: 14px;
  box-shadow: 0 2px 8px rgba(26, 115, 232, 0.3);
}

.export-bar .drawer-actions .copy-btn:hover:not(:disabled) {
  background: var(--primary-dark);
}

.export-bar .drawer-actions .copy-btn:disabled {
  background: var(--bg-tertiary);
  color: var(--text-light);
  cursor: not-allowed;
  box-shadow: none;
}

.export-bar .drawer-actions .drawer-clear-btn {
  background: #ffffff;
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
}

.export-bar .drawer-actions .drawer-clear-btn:hover:not(:disabled) {
  border-color: var(--danger);
  color: var(--danger);
  background: #fef2f1;
}

.export-bar .drawer-actions .drawer-clear-btn:disabled {
  color: var(--text-light);
  background: var(--bg-secondary);
  cursor: not-allowed;
  border-color: var(--border-color);
}

.export-bar .drawer-tip {
  font-size: 11.5px;
  color: var(--text-light);
  line-height: 1.6;
  border-top: 1px solid var(--border-color);
  padding-top: 10px;
  margin-top: 4px;
}

/* ---- Cards / 阴影 / 圆角 ---- */
.card,
.filter-bar,
.stat-card {
  box-shadow: var(--shadow-sm);
  border-color: var(--border-color);
}

.card-header {
  background: var(--bg-secondary);
  min-height: 48px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-color);
}

.card-header h3 {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
}

.card-body {
  padding: 16px;
}

/* ---- Filter bar ---- */
.filter-bar {
  background: #ffffff;
  border-color: var(--border-color);
  padding: 12px 16px;
  gap: 14px;
}

.filter-group label {
  color: var(--text-light);
  text-transform: none;
  letter-spacing: 0;
  font-size: 11.5px;
}

.filter-group select,
.filter-group input {
  border-color: var(--border-color);
  min-width: 130px;
  border-radius: 8px;
}

.filter-group select:focus,
.filter-group input:focus {
  border-color: var(--primary);
  box-shadow: var(--focus-ring);
}

.search-btn {
  background: var(--primary);
  border-radius: 8px;
  font-weight: 600;
}

.search-btn:hover {
  background: var(--primary-dark);
}

/* ---- KPI stat ---- */
.stat-card .stat-value {
  color: var(--primary);
  font-size: 26px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  line-height: 1.2;
}

.stat-card .stat-label {
  color: var(--text-secondary);
  font-size: 12px;
  margin-top: 2px;
}

/* ---- Tag / badge 颜色对齐 ---- */
.tag-green   { background: #dcfce7; color: #15803d; }
.tag-red     { background: #fee2e2; color: #b91c1c; }
.tag-yellow  { background: #fef3c7; color: #b45309; }
.tag-blue    { background: #dbeafe; color: #1d4ed8; }
.tag-purple  { background: #ede9fe; color: #6d28d9; }

.freq-high   { background: #dcfce7; color: #15803d; border-color: #bbf7d0; }
.freq-medium { background: #fef3c7; color: #b45309; border-color: #fde68a; }
.freq-low    { background: #fee2e2; color: #b91c1c; border-color: #fecaca; }

/* ---- 试卷选择卡 ---- */
.exam-select-card {
  border: 1px solid var(--border-color);
  border-radius: 10px;
  background: #ffffff;
  transition: border-color .15s ease, box-shadow .15s ease;
}

.exam-select-card:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-md);
}

.exam-select-card.selected {
  border-color: var(--primary);
  background: var(--primary-light);
  box-shadow: 0 0 0 1px var(--primary);
}

.exam-selector-summary {
  border-color: #c7d2fe;
  background: var(--primary-light);
  color: var(--text-secondary);
  font-size: 13px;
  padding: 10px 14px;
}

.exam-selector-summary strong {
  color: var(--primary-dark);
}

.exam-selector-more-hint {
  background: #fff7ed;
  color: #9a3412;
  border-color: #fed7aa;
}

/* ---- 对比表格 ---- */
.comparison-table th {
  background: var(--bg-secondary);
  color: var(--text-secondary);
  font-size: 12px;
  font-weight: 600;
}

.comparison-table td:first-child,
.comparison-table th:first-child {
  background: var(--bg-secondary);
  font-weight: 500;
  color: var(--text-secondary);
  border-right: 1px solid var(--border-color);
}

.comparison-table .row-category {
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  font-size: 12px;
  font-weight: 600;
}

/* ---- 热力图 row card ---- */
.heatmap-row-card {
  border: 1px solid var(--border-color);
  background: #ffffff;
  box-shadow: var(--shadow-sm);
  border-radius: 12px;
}

.heatmap-q-number {
  background: var(--primary);
  border-radius: 12px;
}

.heatmap-row-head h4 { color: var(--text-primary); font-weight: 700; }
.heatmap-row-head p { color: var(--text-light); }

.heatmap-exam-card {
  border: 1px solid var(--border-color);
  border-radius: 12px;
  background: #ffffff;
}

.heatmap-table th { background: var(--bg-secondary); color: var(--text-secondary); }

/* ---- Question card: 去 paper bg / 大阴影 ---- */
.question-card {
  border-radius: 12px;
  box-shadow: var(--shadow-sm);
  background: #ffffff;
}

.question-card::before { width: 3px; }

.question-card-head {
  padding: 10px 14px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
}

.question-index-mark {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: var(--primary-light);
  color: var(--primary);
  border: 1px solid var(--primary-light);
  font-weight: 700;
  font-size: 13px;
}

.question-card-head .kp-name {
  font-size: 14px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: 0;
}

.question-card-main {
  padding: 12px 14px;
}

.question-stem-block {
  border-color: var(--border-color);
  background: #ffffff;
  border-radius: 10px;
}

.question-card-body {
  font-size: 14px;
  line-height: 1.85;
  color: var(--text-primary);
  padding: 9px 12px;
}

.q-answer {
  border-color: #dbeafe;
  background: #f8fbff;
  color: #1e3a5f;
  border-radius: 10px;
}

.q-answer summary {
  color: var(--primary);
  background: #eff6ff;
  padding: 8px 12px;
  font-size: 12px;
}

/* ---- 搜索模式 ---- */
.search-mode-switch {
  background: var(--bg-secondary);
  border-color: var(--border-color);
  border-radius: 10px;
}

.search-mode {
  color: var(--text-secondary);
  font-weight: 600;
  border-radius: 8px;
}

.search-mode.active {
  background: #ffffff;
  color: var(--primary);
  box-shadow: 0 1px 2px rgba(15,23,42,0.06), 0 0 0 1px var(--primary);
}

.search-mode-switch::after {
  color: var(--text-light);
  font-size: 11.5px;
}

.search-filter-row {
  background: var(--bg-secondary);
  border-color: var(--border-color);
  border-radius: 10px;
}

.result-summary {
  border-color: #c7d2fe;
  background: var(--primary-light);
  color: var(--text-secondary);
  border-radius: 10px;
  font-size: 13px;
}

.result-summary strong { color: var(--primary-dark); }

.search-result-item {
  border-radius: 12px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
  background: #ffffff;
}

.search-input-wrapper input {
  border-color: var(--border-color);
  border-radius: 10px;
}

.search-input-wrapper input:focus {
  border-color: var(--primary);
  box-shadow: var(--focus-ring);
}

.search-icon { color: var(--text-light); }

/* ---- 空状态 ---- */
.empty-state {
  padding: 48px 20px;
}

.empty-state .empty-icon {
  font-size: 32px;
  opacity: 0.45;
  margin-bottom: 12px;
}

.empty-state h3 {
  font-size: 15px;
  color: var(--text-secondary);
}

.empty-state p {
  font-size: 13px;
}

/* ---- Toast ---- */
.toast {
  top: 76px;
  right: 24px;
  background: #1e293b;
  border-radius: 10px;
}

.toast.success { background: #059669; }
.toast.error   { background: #dc2626; }

/* ---- 响应式：drawer 折回下方 ---- */
@media (max-width: 1100px) {
  .app-shell {
    grid-template-columns: 1fr;
  }
  .export-bar {
    position: static;
    top: auto;
    order: 2;
  }
}

@media (max-width: 768px) {
  .app-shell { padding: 16px; }
  .header-inner { flex-direction: column; align-items: stretch; gap: 10px; padding: 10px 16px; }
  .tab-nav { width: 100%; justify-content: flex-start; overflow-x: auto; }
  .tab-btn { padding: 8px 12px; font-size: 13px; }
  .filter-bar { flex-direction: column; align-items: stretch; }
  .filter-group { width: 100%; }
  .filter-group select, .filter-group input { width: 100%; min-width: 0; }
}

@media (max-width: 560px) {
  .logo-text p { display: none; }
  .stats-overview { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

/* ==================== 2026-08-27 题库分类与小升初地区筛选 ==================== */
.is-hidden {
  display: none !important;
}

.library-switcher {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 18px 20px;
  margin-bottom: 20px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, #ffffff 0%, #f5f9ff 100%);
  box-shadow: var(--shadow-sm);
}

.library-switcher-copy {
  min-width: 0;
}

.library-switcher-kicker {
  display: block;
  margin-bottom: 3px;
  color: var(--primary);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.12em;
}

.library-switcher h2 {
  margin: 0;
  color: var(--text-primary);
  font-size: 18px;
}

.library-switcher p {
  margin: 5px 0 0;
  color: var(--text-secondary);
  font-size: 13px;
}

.library-switcher-actions {
  display: grid;
  grid-template-columns: repeat(2, minmax(132px, 1fr));
  gap: 8px;
  flex: 0 0 auto;
  padding: 4px;
  border: 1px solid #dbe4f0;
  border-radius: 12px;
  background: #edf3fb;
}

.library-btn {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 2px;
  padding: 10px 16px;
  border: 1px solid transparent;
  border-radius: 9px;
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  transition: var(--transition);
}

.library-btn span {
  font-size: 15px;
  font-weight: 800;
}

.library-btn small {
  color: var(--text-light);
  font-size: 11px;
}

.library-btn:hover {
  background: rgba(255, 255, 255, 0.72);
  color: var(--text-primary);
}

.library-btn.active {
  border-color: rgba(26, 115, 232, 0.24);
  background: #ffffff;
  color: var(--primary);
  box-shadow: 0 2px 8px rgba(15, 23, 42, 0.08);
}

.library-btn:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
}

body[data-library="xiaoshengchu"] .library-switcher {
  background: linear-gradient(135deg, #ffffff 0%, #f7f2ff 100%);
}

body[data-library="xiaoshengchu"] .library-switcher-kicker,
body[data-library="xiaoshengchu"] .library-btn.active {
  color: #7c3aed;
}

body[data-library="xiaoshengchu"] .library-btn.active {
  border-color: rgba(124, 58, 237, 0.24);
}

.empty-state.compact {
  width: 100%;
  padding: 12px;
}

@media (max-width: 768px) {
  .library-switcher {
    align-items: stretch;
    flex-direction: column;
    padding: 16px;
  }

  .library-switcher-actions {
    width: 100%;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .library-btn {
    align-items: center;
  }
}

/* ==================== 2026-06-21 pass 2: 人体工学优化 ==================== */

/* ---- 默认：drawer 不显示，main 单列满宽 ---- */
.app-shell {
  display: block;
}

.export-bar {
  display: none;
}

.export-fab {
  display: none;
}

.drawer-close {
  display: none;
}

/* ---- 仅 search tab 才出 grid + drawer ---- */
body[data-tab="search"] .app-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 20px;
  align-items: start;
}

body[data-tab="search"] .export-bar {
  display: flex;
  position: sticky;
  top: 84px;
}

/* drawer 顶部 pill 不再需要（仅在 search tab 显示，无需指明来源） */
.export-bar .drawer-header {
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 10px;
}

.export-bar .drawer-header h4 {
  font-size: 13px;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0;
  text-transform: none;
  letter-spacing: 0;
}

/* drawer 中"已选 0 道"做大一点 */
.export-bar .drawer-stat {
  align-items: baseline;
  gap: 8px;
  margin-top: 2px;
}

/* ID 列表紧凑 */
.export-bar .export-ids {
  max-height: 220px;
}

/* ---- 移动端：drawer 隐藏，改 FAB + 底部 sheet ---- */
@media (max-width: 768px) {
  body[data-tab="search"] .app-shell {
    display: block;
  }

  body[data-tab="search"] .export-bar {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    top: auto;
    max-height: 72vh;
    overflow-y: auto;
    border-radius: 16px 16px 0 0;
    box-shadow: 0 -8px 24px rgba(15, 23, 42, 0.14);
    padding: 16px 16px 20px;
    transform: translateY(100%);
    transition: transform 0.25s ease;
    z-index: 1000;
  }

  body[data-tab="search"].drawer-open .export-bar {
    transform: translateY(0);
  }

  body[data-tab="search"] .drawer-close {
    display: inline-flex;
    position: absolute;
    top: 10px;
    right: 12px;
    width: 30px;
    height: 30px;
    border-radius: 50%;
    border: 0;
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    font-size: 18px;
    line-height: 1;
    cursor: pointer;
    align-items: center;
    justify-content: center;
  }

  body[data-tab="search"] .drawer-close:hover {
    background: var(--bg-secondary);
    color: var(--text-primary);
  }

  body[data-tab="search"] .export-fab {
    display: inline-flex;
    position: fixed;
    bottom: 20px;
    right: 20px;
    z-index: 999;
    padding: 12px 18px;
    border-radius: 999px;
    background: var(--primary);
    color: #fff;
    border: 0;
    box-shadow: 0 6px 20px rgba(79, 70, 229, 0.34);
    font-weight: 600;
    font-size: 13px;
    cursor: pointer;
    align-items: center;
    gap: 8px;
    transition: transform 0.15s ease, box-shadow 0.15s ease;
  }

  body[data-tab="search"] .export-fab:hover {
    transform: translateY(-1px);
    box-shadow: 0 8px 24px rgba(79, 70, 229, 0.4);
  }

  body[data-tab="search"] .export-fab.is-empty {
    background: #94a3b8;
    box-shadow: 0 4px 14px rgba(15, 23, 42, 0.18);
  }

  body[data-tab="search"] .export-fab .fab-count {
    display: inline-flex;
    min-width: 22px;
    height: 22px;
    padding: 0 6px;
    border-radius: 11px;
    background: rgba(255, 255, 255, 0.22);
    color: #fff;
    font-size: 12px;
    font-weight: 700;
    align-items: center;
    justify-content: center;
    font-variant-numeric: tabular-nums;
  }

  body[data-tab="search"] .export-fab.is-empty .fab-count {
    background: rgba(255, 255, 255, 0.18);
  }
}

/* drawer-open 时遮罩 */
body.drawer-open::after {
  content: '';
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.32);
  z-index: 998;
}

/* ---- 键盘快捷键提示（drawer tip 内追加） ---- */
.export-bar .drawer-tip kbd {
  display: inline-block;
  padding: 1px 5px;
  border: 1px solid var(--border-color);
  border-bottom-width: 2px;
  border-radius: 4px;
  background: #ffffff;
  color: var(--text-primary);
  font-family: 'Consolas', 'Monaco', monospace;
  font-size: 10.5px;
  font-weight: 600;
  margin: 0 1px;
}

/* ---- 主区域 full-width 时控制最大宽度 ---- */
.app-shell .main-content {
  width: 100%;
}