/* ===== 谢礼猫 Web 端样式 ===== */
/* 设计理念：清爽、简洁、现代，注重阅读体验和交互友好 */

:root {
  --primary: #4f6df5;
  --primary-light: #6b85f7;
  --primary-dark: #3b56d4;
  --primary-bg: #eef1ff;
  --success: #22c55e;
  --warning: #f59e0b;
  --danger: #ef4444;
  --text-primary: #1a1a2e;
  --text-secondary: #64748b;
  --text-tertiary: #94a3b8;
  --bg-page: #f8f9fc;
  --bg-card: #ffffff;
  --border: #e8ecf1;
  --border-light: #f1f5f9;
  --shadow-sm: 0 1px 2px rgba(0,0,0,.04);
  --shadow-md: 0 4px 12px rgba(0,0,0,.06);
  --shadow-lg: 0 8px 24px rgba(0,0,0,.08);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --transition: .2s cubic-bezier(.4,0,.2,1);
}

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

html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }

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

a { color: inherit; text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--primary); }

/* ===== 导航栏 ===== */
.navbar {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255,255,255,.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-light);
  transition: box-shadow var(--transition);
}
.navbar-inner {
  max-width: 1200px; margin: 0 auto; padding: 0 24px;
  height: 64px; display: flex; align-items: center; justify-content: space-between;
}
.navbar-logo {
  display: flex; align-items: center; gap: 8px;
  font-size: 20px; font-weight: 700; color: var(--primary);
}
.navbar-logo .logo-icon {
  width: 36px; height: 36px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  color: #fff; font-size: 18px; font-weight: 800;
}
.navbar-logo .logo-icon img{
    width: 36px; height: 36px;
}
.navbar-nav {
  display: flex; gap: 32px; list-style: none; align-items: center;
}
.navbar-nav a {
  font-size: 15px; font-weight: 500; color: var(--text-secondary);
  position: relative; padding: 4px 0;
}
.navbar-nav a:hover, .navbar-nav a.active { color: var(--primary); }
.navbar-nav a.active::after {
  content: ''; position: absolute; bottom: -4px; left: 0; right: 0; height: 2px;
  background: var(--primary); border-radius: 2px;
}
.navbar-cta {
  display: flex; gap: 12px; align-items: center;
}

/* ===== 按钮 ===== */
.btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 10px 20px; border-radius: var(--radius-sm);
  font-size: 14px; font-weight: 600; cursor: pointer;
  border: none; transition: all var(--transition);
  white-space: nowrap;
}
.btn-primary {
  background: var(--primary); color: #fff;
}
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-1px); box-shadow: 0 4px 12px rgba(79,109,245,.3); }
.btn-outline {
  background: transparent; color: var(--primary); border: 1.5px solid var(--primary);
}
.btn-outline:hover { background: var(--primary-bg); }
.btn-ghost {
  background: transparent; color: var(--text-secondary); border: 1px solid var(--border);
}
.btn-ghost:hover { background: var(--bg-page); border-color: var(--text-tertiary); }
.btn-success { background: var(--success); color: #fff; }
.btn-success:hover { filter: brightness(1.1); transform: translateY(-1px); }
.btn-sm { padding: 6px 14px; font-size: 13px; }
.btn-lg { padding: 14px 32px; font-size: 16px; }
.btn-block { display: flex; width: 100%; justify-content: center; }

/* ===== 容器 ===== */
.container {
  max-width: 1200px; margin: 0 auto; padding: 0 24px;
}
.container-sm { max-width: 800px; margin: 0 auto; padding: 0 24px; }

/* ===== Hero 区域 ===== */
.hero {
  background: linear-gradient(135deg, #4f6df5 0%, #6b85f7 50%, #818cf8 100%);
  color: #fff; padding: 64px 0 72px; position: relative; overflow: hidden;
}
.hero::before {
  content: ''; position: absolute; top: -50%; right: -10%; width: 500px; height: 500px;
  background: rgba(255,255,255,.08); border-radius: 50%; filter: blur(60px);
}
.hero::after {
  content: ''; position: absolute; bottom: -30%; left: -5%; width: 300px; height: 300px;
  background: rgba(255,255,255,.06); border-radius: 50%; filter: blur(40px);
}
.hero-inner { position: relative; z-index: 1; text-align: center; }
.hero h1 {
  font-size: 42px; font-weight: 800; margin-bottom: 16px; letter-spacing: -.02em;
  text-shadow: 0 2px 8px rgba(0,0,0,.1);
}
.hero-subtitle {
  font-size: 18px; opacity: .9; max-width: 640px; margin: 0 auto 32px; line-height: 1.7;
}
.hero-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.hero-stats {
  display: flex; gap: 48px; justify-content: center; margin-top: 48px; flex-wrap: wrap;
}
.hero-stat { text-align: center; }
.hero-stat-num { font-size: 32px; font-weight: 800; }
.hero-stat-label { font-size: 14px; opacity: .8; margin-top: 4px; }

/* ===== 卡片 ===== */
.card {
  background: var(--bg-card); border-radius: var(--radius-lg); border: 1px solid var(--border-light);
  box-shadow: var(--shadow-sm); transition: all var(--transition);
}
.card:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); }

.card-body { padding: 24px; }

/* ===== 筛选栏 ===== */
.filter-bar {
  background: var(--bg-card); border: 1px solid var(--border-light);
  border-radius: var(--radius-lg); padding: 20px 24px; margin-bottom: 32px;
  display: flex; gap: 16px; flex-wrap: wrap; align-items: center;
  box-shadow: var(--shadow-sm);
}
.filter-group { display: flex; gap: 8px; flex-wrap: wrap; }
.filter-label { font-size: 14px; font-weight: 600; color: var(--text-secondary); margin-right: 4px; line-height: 36px; }
.filter-chip {
  display: inline-flex; align-items: center; padding: 6px 16px;
  border-radius: 20px; font-size: 14px; font-weight: 500;
  background: var(--bg-page); color: var(--text-secondary);
  border: 1px solid var(--border); cursor: pointer; transition: all var(--transition);
}
.filter-chip:hover { border-color: var(--primary); color: var(--primary); }
.filter-chip.active { background: var(--primary); color: #fff; border-color: var(--primary); }

/* ===== 试卷网格 ===== */
.paper-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 20px;
}
.paper-card { cursor: pointer; overflow: hidden; }
.paper-card .card-body { padding: 20px; }
.paper-card-header {
  display: flex; justify-content: space-between; align-items: start; margin-bottom: 12px;
}
.paper-card-title { font-size: 16px; font-weight: 700; color: var(--text-primary); }
.paper-badge {
  display: inline-flex; padding: 3px 10px; border-radius: 6px;
  font-size: 12px; font-weight: 600; background: var(--primary-bg); color: var(--primary);
}
.paper-card-meta {
  display: flex; flex-wrap: wrap; gap: 12px; font-size: 13px; color: var(--text-tertiary); margin-top: 8px;
}
.paper-card-meta span { display: flex; align-items: center; gap: 4px; }
.paper-card-footer {
  display: flex; justify-content: space-between; align-items: center;
  margin-top: 16px; padding-top: 16px; border-top: 1px solid var(--border-light);
}
.paper-card-stat { font-size: 13px; color: var(--text-secondary); }
.paper-card-stat strong { color: var(--primary); font-size: 15px; }

/* ===== 试卷详情 ===== */
.paper-header {
  background: linear-gradient(135deg, #4f6df5 0%, #6b85f7 100%);
  color: #fff; padding: 48px 0; border-radius: 0 0 var(--radius-xl) var(--radius-xl);
  margin-bottom: 32px;
}
.paper-header h1 { font-size: 28px; font-weight: 800; margin-bottom: 12px; }
.paper-header-meta { display: flex; gap: 24px; flex-wrap: wrap; opacity: .9; font-size: 15px; }
.paper-header-meta span { display: flex; align-items: center; gap: 6px; }
.paper-actions {
  display: flex; gap: 12px; margin-top: 24px; flex-wrap: wrap;
}

/* 题目区 */
.question-section {
  background: var(--bg-card); border-radius: var(--radius-lg);
  border: 1px solid var(--border-light); box-shadow: var(--shadow-sm);
  margin-bottom: 24px; overflow: hidden;
}
.question-section-header {
  padding: 16px 24px; background: var(--primary-bg);
  font-size: 16px; font-weight: 700; color: var(--primary);
  border-bottom: 1px solid var(--border-light);
}
.question-item {
  padding: 20px 24px; border-bottom: 1px solid var(--border-light);
}
.question-item:last-child { border-bottom: none; }
.question-seq {
  display: inline-flex; width: 28px; height: 28px;
  background: var(--primary); color: #fff; border-radius: 50%;
  align-items: center; justify-content: center;
  font-size: 14px; font-weight: 700; margin-right: 12px; flex-shrink: 0;
}
.question-stem {
  display: inline; font-size: 15px; line-height: 1.8; color: var(--text-primary);
}
.question-options { margin: 12px 0 12px 40px; }
.question-option {
  display: block; padding: 6px 0; font-size: 14px; color: var(--text-secondary); line-height: 1.7;
}
.question-answer {
  margin: 12px 0 0 40px; padding: 12px 16px; background: #f0fdf4; border-radius: var(--radius-sm);
  border-left: 3px solid var(--success);
}
.question-answer-label { font-size: 13px; font-weight: 700; color: var(--success); }
.question-answer-text { font-size: 14px; color: var(--text-primary); margin-top: 4px; }
.question-analysis {
  margin: 8px 0 0 40px; padding: 12px 16px; background: var(--bg-page); border-radius: var(--radius-sm);
}
.question-analysis-label { font-size: 13px; font-weight: 700; color: var(--text-tertiary); }
.question-analysis-text { font-size: 14px; color: var(--text-secondary); margin-top: 4px; line-height: 1.7; }
.question-score {
  float: right; font-size: 13px; color: var(--text-tertiary);
  background: var(--bg-page); padding: 2px 10px; border-radius: 12px;
}

/* ===== 分页 ===== */
.pagination {
  display: flex; gap: 8px; justify-content: center; margin-top: 40px;
  flex-wrap: wrap;
}
.pagination a, .pagination span {
  display: inline-flex; align-items: center; justify-content: center;
  min-width: 40px; height: 40px; padding: 0 12px;
  border-radius: var(--radius-sm); font-size: 14px; font-weight: 500;
  border: 1px solid var(--border); background: var(--bg-card); color: var(--text-secondary);
  transition: all var(--transition);
}
.pagination a:hover { border-color: var(--primary); color: var(--primary); }
.pagination .active { background: var(--primary); color: #fff; border-color: var(--primary); }
.pagination .disabled { color: var(--text-tertiary); cursor: not-allowed; }

/* ===== 特色区块 ===== */
.section { padding: 64px 0; }
.section-title { text-align: center; font-size: 32px; font-weight: 800; margin-bottom: 12px; }
.section-subtitle { text-align: center; font-size: 16px; color: var(--text-secondary); margin-bottom: 48px; }

.features-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 24px;
}
.feature-card {
  text-align: center; padding: 32px 24px; border-radius: var(--radius-lg);
  border: 1px solid var(--border-light); background: var(--bg-card);
  transition: all var(--transition);
}
.feature-card:hover { box-shadow: var(--shadow-md); transform: translateY(-4px); }
.feature-icon {
  width: 56px; height: 56px; border-radius: var(--radius-md);
  display: flex; align-items: center; justify-content: center;
  font-size: 24px; margin: 0 auto 16px; color: #fff;
}
.feature-icon.blue { background: linear-gradient(135deg, #4f6df5, #6b85f7); }
.feature-icon.green { background: linear-gradient(135deg, #22c55e, #4ade80); }
.feature-icon.orange { background: linear-gradient(135deg, #f59e0b, #fbbf24); }
.feature-icon.purple { background: linear-gradient(135deg, #8b5cf6, #a78bfa); }
.feature-title { font-size: 18px; font-weight: 700; margin-bottom: 8px; }
.feature-desc { font-size: 14px; color: var(--text-secondary); line-height: 1.7; }

/* ===== 统计区块 ===== */
.stats-bar {
  display: flex; justify-content: center; gap: 48px; flex-wrap: wrap;
  padding: 32px 0;
}
.stats-bar-item { text-align: center; }
.stats-bar-num { font-size: 36px; font-weight: 800; color: var(--primary); }
.stats-bar-label { font-size: 14px; color: var(--text-secondary); margin-top: 4px; }

/* ===== CTA 区域 ===== */
.cta-section {
  background: linear-gradient(135deg, #4f6df5 0%, #6b85f7 100%);
  color: #fff; text-align: center; padding: 64px 24px; border-radius: var(--radius-xl);
  margin: 48px 0;
}
.cta-section h2 { font-size: 28px; font-weight: 800; margin-bottom: 12px; }
.cta-section p { font-size: 16px; opacity: .9; margin-bottom: 24px; }

/* ===== 弹窗 ===== */
.modal-overlay {
  position: fixed; top: 0; left: 0; right: 0; bottom: 0; z-index: 1000;
  background: rgba(0,0,0,.5); backdrop-filter: blur(4px);
  display: none; align-items: center; justify-content: center;
  opacity: 0; transition: opacity var(--transition);
}
.modal-overlay.show { display: flex; opacity: 1; }
.modal {
  background: var(--bg-card); border-radius: var(--radius-xl);
  padding: 40px; max-width: 420px; width: 90%; text-align: center;
  box-shadow: var(--shadow-lg); transform: scale(.95); transition: transform var(--transition);
}
.modal-overlay.show .modal { transform: scale(1); }
.modal-title { font-size: 22px; font-weight: 800; margin-bottom: 8px; }
.modal-desc { font-size: 14px; color: var(--text-secondary); margin-bottom: 24px; }
.modal-qr {
  width: 220px; height: 220px; margin: 0 auto 24px;
  background: var(--bg-page); border-radius: var(--radius-md);
  display: flex; align-items: center; justify-content: center;
  border: 2px dashed var(--border);
}
.modal-qr img { max-width: 200px; max-height: 200px; border-radius: var(--radius-sm); }
.modal-close {
  position: absolute; top: 16px; right: 16px;
  width: 32px; height: 32px; border-radius: 50%;
  background: var(--bg-page); border: none; cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  font-size: 18px; color: var(--text-secondary); transition: all var(--transition);
}
.modal-close:hover { background: var(--border); color: var(--text-primary); }

/* ===== 空状态 ===== */
.empty-state { text-align: center; padding: 64px 24px; color: var(--text-tertiary); }
.empty-state-icon { font-size: 48px; margin-bottom: 16px; }
.empty-state-text { font-size: 16px; }

/* ===== 页脚 ===== */
.footer {
  background: #1a1a2e; color: #94a3b8; padding: 48px 0 24px; margin-top: 64px;
}
.footer-grid {
  display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 32px; margin-bottom: 32px;
}
.footer-brand { font-size: 20px; font-weight: 700; color: #fff; margin-bottom: 12px; }
.footer-desc { font-size: 14px; line-height: 1.7; }
.footer-col h4 { color: #fff; font-size: 15px; margin-bottom: 12px; }
.footer-col a { display: block; font-size: 14px; padding: 4px 0; color: #94a3b8; }
.footer-col a:hover { color: #fff; }
.footer-bottom {
  text-align: center; padding-top: 24px; border-top: 1px solid rgba(255,255,255,.1);
  font-size: 13px;
}

/* ===== 加载动画 ===== */
.loading {
  display: inline-block; width: 20px; height: 20px;
  border: 2px solid var(--border); border-top-color: var(--primary);
  border-radius: 50%; animation: spin .6s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ===== 响应式 ===== */
@media (max-width: 768px) {
  .navbar-nav { display: none; }
  .hero h1 { font-size: 28px; }
  .hero-subtitle { font-size: 15px; }
  .hero-stats { gap: 24px; }
  .hero-stat-num { font-size: 24px; }
  .section-title { font-size: 24px; }
  .paper-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 24px; }
  .paper-header h1 { font-size: 22px; }
  .filter-bar { flex-direction: column; align-items: flex-start; }
  .focus-chapter-tags { gap: 6px; }
  .focus-chapter-tag { font-size: 12px; padding: 3px 8px; }
}

/* ===== 学习重点 - 头部章节标签 ===== */
.focus-chapter-tags {
  display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px;
}
.focus-chapter-tag {
  display: inline-flex; align-items: center; padding: 5px 14px;
  border-radius: 20px; font-size: 13px; font-weight: 500;
  background: rgba(255,255,255,.15); color: #fff;
  border: 1px solid rgba(255,255,255,.25);
}

/* ===== 学习重点 - 通用区块（仅详情页） ===== */
.focus-section { margin-bottom: 32px; }
.focus-section > .question-section-header {
  padding: 18px 28px; font-size: 18px; font-weight: 700;
}
.focus-section > div:not(.question-section-header) {
  padding: 24px 28px;
}

/* ===== 学习重点 - 总体分析 ===== */
.focus-overview { display: flex; flex-direction: column; gap: 16px; }
.focus-overview-item {
  display: flex; align-items: flex-start; gap: 16px;
  padding: 16px 20px; background: var(--bg-page); border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
  transition: border-color .2s, box-shadow .2s;
}
.focus-overview-item:hover { border-color: var(--primary-light, #c7d2fe); box-shadow: 0 2px 8px rgba(0,0,0,.04); }
.focus-overview-num {
  display: inline-flex; width: 32px; height: 32px;
  background: linear-gradient(135deg, var(--primary), #6366f1); color: #fff;
  border-radius: 50%; align-items: center; justify-content: center;
  font-size: 15px; font-weight: 700; flex-shrink: 0;
}
.focus-overview-text { font-size: 15px; line-height: 2; color: var(--text-primary); flex: 1; }

/* ===== 学习重点 - 重点知识分析 ===== */
.focus-keypoints { display: flex; flex-direction: column; gap: 20px; }
.focus-legend {
  display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 4px;
  padding: 12px 16px; background: var(--bg-page); border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
}
.focus-legend-tag {
  font-size: 13px; font-weight: 600; padding: 5px 12px;
  border-radius: 20px;
}
.focus-legend-tag.lv3 { color: #C0392B; background: #FFE4E4; }
.focus-legend-tag.lv2 { color: #B9770E; background: #FFF1DE; }
.focus-legend-tag.lv1 { color: #4E9A51; background: #E8F6E8; }
.focus-legend-tag.err { color: #7D3C98; background: #F6EEFB; }

.focus-chapter-card {
  border: 1px solid var(--border-light); border-left: 5px solid var(--primary);
  border-radius: var(--radius-md); padding: 20px 24px;
  background: var(--bg-card); box-shadow: 0 1px 3px rgba(0,0,0,.03);
  transition: box-shadow .2s;
}
.focus-chapter-card:hover { box-shadow: 0 4px 12px rgba(0,0,0,.06); }
.focus-chapter-card.lv3 { border-left-color: #C0392B; }
.focus-chapter-card.lv2 { border-left-color: #B9770E; }
.focus-chapter-head {
  display: flex; align-items: center; gap: 10px; flex-wrap: wrap;
  margin-bottom: 16px; padding-bottom: 12px; border-bottom: 1px solid var(--border-light);
}
.focus-lv-badge {
  font-size: 12px; font-weight: 700; padding: 3px 10px;
  border-radius: 12px;
}
.focus-lv-badge.lv3 { color: #C0392B; background: #FFE4E4; }
.focus-lv-badge.lv2 { color: #B9770E; background: #FFF1DE; }
.focus-lv-badge.lv1 { color: #4E9A51; background: #E8F6E8; }
.focus-chapter-title { font-size: 17px; font-weight: 700; color: var(--text-primary); }
.focus-chapter-count { font-size: 13px; color: var(--text-tertiary); }

.focus-chapter-body { display: flex; flex-direction: column; gap: 12px; }
.focus-point {
  border-left: 4px solid var(--border); padding: 14px 16px;
  background: #fafbfc; border-radius: 0 8px 8px 0;
  font-size: 15px; line-height: 1.8;
}
.focus-point.lv3 { border-left-color: #C0392B; background: #FFF7F7; }
.focus-point.lv2 { border-left-color: #B9770E; background: #FFFBF4; }
.focus-point.lv1 { border-left-color: #4E9A51; background: #F6FBF6; }
.focus-point-badge {
  font-size: 12px; font-weight: 700; margin-right: 8px;
  padding: 2px 8px; border-radius: 4px; display: inline-block;
}
.focus-point-badge.lv3 { color: #fff; background: #C0392B; }
.focus-point-badge.lv2 { color: #fff; background: #B9770E; }
.focus-point-badge.lv1 { color: #fff; background: #4E9A51; }
.focus-point-label { font-weight: 700; color: var(--text-primary); margin-right: 4px; }
.focus-point-text { color: var(--text-secondary); }

.focus-error-box {
  background: #FAF0FE; border-left: 4px solid #7D3C98;
  padding: 14px 16px; border-radius: 0 8px 8px 0;
  font-size: 14.5px; color: var(--text-secondary); line-height: 1.8;
  display: flex; align-items: flex-start; gap: 8px;
}
.focus-error-title { color: #7D3C98; font-weight: 700; flex-shrink: 0; }
.focus-error-text { flex: 1; }

/* ===== 学习重点 - 复习方法 ===== */
.focus-review { display: flex; flex-direction: column; gap: 16px; }
.focus-step-card {
  border-left: 5px solid var(--primary); background: linear-gradient(135deg, #FAFBFF, #F5F7FF);
  border-radius: var(--radius-md); padding: 20px 24px;
  border: 1px solid var(--border-light); border-left-width: 5px;
}
.focus-step-head {
  display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin-bottom: 12px;
}
.focus-step-no {
  display: inline-flex; width: 32px; height: 32px;
  background: linear-gradient(135deg, var(--primary), #6366f1); color: #fff;
  border-radius: 50%; align-items: center; justify-content: center;
  font-size: 15px; font-weight: 700; flex-shrink: 0;
}
.focus-step-title { font-size: 16px; font-weight: 700; color: var(--text-primary); }
.focus-step-nolabel { font-size: 13px; color: var(--text-tertiary); }
.focus-step-body {
  font-size: 15px; color: var(--text-secondary); line-height: 1.9;
  padding-left: 42px; margin-top: 4px;
}
.focus-check-box {
  background: #EAF7EA; border-left: 4px solid var(--success);
  border-radius: 0 8px 8px 0; padding: 12px 16px; margin: 12px 0 0 42px;
  font-size: 14.5px; color: var(--text-secondary); line-height: 1.8;
  display: flex; align-items: flex-start; gap: 8px;
}
.focus-check-title { color: var(--success); font-weight: 700; flex-shrink: 0; }

/* ===== 学习重点 - 配套练习 ===== */
.focus-hint {
  font-size: 14px; color: var(--text-tertiary); margin-bottom: 20px;
  padding: 10px 16px; background: var(--bg-page); border-radius: var(--radius-sm);
  border: 1px dashed var(--border);
}
.focus-practice { display: flex; flex-direction: column; gap: 20px; }
.focus-question-card {
  border: 1px solid var(--border-light); border-left: 4px solid var(--primary);
  padding: 20px 24px; background: var(--bg-card);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  box-shadow: 0 1px 3px rgba(0,0,0,.03);
}
.focus-question-head {
  display: flex; align-items: center; gap: 10px; margin-bottom: 14px;
  padding-bottom: 12px; border-bottom: 1px solid var(--border-light);
}
.focus-question-no {
  display: inline-flex; width: 32px; height: 32px;
  background: linear-gradient(135deg, var(--primary), #6366f1); color: #fff;
  border-radius: 50%; align-items: center; justify-content: center;
  font-size: 15px; font-weight: 700; flex-shrink: 0;
}
.focus-type-tag {
  font-size: 12px; font-weight: 600; color: var(--primary);
  background: var(--primary-bg); padding: 3px 10px; border-radius: 12px;
}
.focus-question-stem {
  font-size: 16px; line-height: 1.9; color: var(--text-primary); font-weight: 500;
  margin-bottom: 4px;
}
.focus-question-options {
  margin: 14px 0 0 42px; padding: 12px 16px; background: var(--bg-page);
  border-radius: var(--radius-sm); border: 1px solid var(--border-light);
}
.focus-option {
  padding: 6px 0; font-size: 14.5px; color: var(--text-secondary); line-height: 1.8;
  border-bottom: 1px dashed var(--border-light);
}
.focus-option:last-child { border-bottom: none; }

/* ===== 学习重点 - 答案与分解 ===== */
.focus-answers { display: flex; flex-direction: column; gap: 20px; }
.focus-answer-card {
  border: 1px solid var(--border-light); border-left: 4px solid var(--success);
  padding: 20px 24px; background: var(--bg-card);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  box-shadow: 0 1px 3px rgba(0,0,0,.03);
}
.focus-answer-line {
  font-size: 16px; margin-bottom: 14px; padding-bottom: 12px;
  border-bottom: 1px solid var(--border-light);
  display: flex; align-items: center; gap: 8px; flex-wrap: wrap;
}
.focus-answer-no { color: var(--primary); font-weight: 700; }
.focus-answer-label { color: var(--success); font-weight: 700; }
.focus-answer-val {
  color: #2E7D32; font-weight: 700; font-size: 17px;
  padding: 2px 12px; background: #E8F5E9; border-radius: 6px;
}
.focus-analysis-row {
  margin: 10px 0 0 14px; font-size: 14.5px; color: var(--text-secondary); line-height: 1.8;
  padding: 10px 14px; background: var(--bg-page); border-radius: var(--radius-sm);
  border-left: 3px solid var(--primary);
}
.focus-analysis-label { color: var(--primary); font-weight: 700; margin-right: 6px; }
.focus-analysis-text { display: inline; }

/* ===== 首页 - 科目覆盖 ===== */
.subject-coverage-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
  gap: 16px;
}
.subject-coverage-item {
  display: flex; flex-direction: column; align-items: center; gap: 6px;
  padding: 24px 12px; background: var(--bg-card);
  border: 1px solid var(--border-light); border-radius: var(--radius-md);
  transition: all var(--transition);
}
.subject-coverage-item:hover {
  border-color: var(--primary); box-shadow: var(--shadow-md);
  transform: translateY(-3px);
}
.subject-coverage-icon { font-size: 32px; }
.subject-coverage-name { font-size: 16px; font-weight: 700; color: var(--text-primary); }
.subject-coverage-count { font-size: 13px; color: var(--text-tertiary); }

/* ===== 首页 - 使用流程 ===== */
.how-to-grid {
  display: flex; gap: 24px; flex-wrap: wrap; justify-content: center;
}
.how-to-step {
  display: flex; gap: 16px; flex: 1; min-width: 280px; max-width: 360px;
  background: var(--bg-card); border: 1px solid var(--border-light);
  border-radius: var(--radius-lg); padding: 24px 28px;
  transition: all var(--transition);
}
.how-to-step:hover { box-shadow: var(--shadow-md); border-color: var(--primary-light); }
.how-to-num {
  display: inline-flex; width: 40px; height: 40px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light)); color: #fff;
  border-radius: 50%; align-items: center; justify-content: center;
  font-size: 18px; font-weight: 800; flex-shrink: 0;
}
.how-to-body { flex: 1; }
.how-to-title { font-size: 17px; font-weight: 700; margin-bottom: 6px; color: var(--text-primary); }
.how-to-desc { font-size: 14px; color: var(--text-secondary); line-height: 1.7; }

/* ===== 首页 - 双栏并排 ===== */
.dual-column {
  display: grid; grid-template-columns: 1fr 1fr; gap: 40px;
}
.dual-col-head {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 20px; padding-bottom: 12px; border-bottom: 2px solid var(--border-light);
}
.dual-col-title { font-size: 22px; font-weight: 800; color: var(--text-primary); }
.dual-col-link { font-size: 14px; font-weight: 600; color: var(--primary); }
.dual-col-link:hover { color: var(--primary-dark); }

.paper-grid-sm {
  display: grid; grid-template-columns: 1fr; gap: 12px;
}

/* ===== 首页 - 学习重点专区 ===== */
.focus-zone-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 24px;
}
.focus-zone-card {
  background: var(--bg-page); border: 1px solid var(--border-light);
  border-radius: var(--radius-lg); padding: 24px;
  transition: all var(--transition);
}
.focus-zone-card:hover { box-shadow: var(--shadow-md); border-color: var(--primary-light); }
.focus-zone-head {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 16px; padding-bottom: 12px; border-bottom: 1px solid var(--border);
}
.focus-zone-label {
  font-size: 18px; font-weight: 800; color: var(--primary);
  display: inline-flex; align-items: center; gap: 6px;
}
.focus-zone-more { font-size: 14px; font-weight: 600; color: var(--text-secondary); }
.focus-zone-more:hover { color: var(--primary); }

.focus-zone-list { display: flex; flex-direction: column; gap: 10px; }
.focus-zone-item {
  display: flex; align-items: center; gap: 10px; flex-wrap: wrap;
  padding: 12px 16px; background: var(--bg-card);
  border: 1px solid var(--border-light); border-radius: var(--radius-sm);
  transition: all var(--transition);
}
.focus-zone-item:hover {
  border-color: var(--primary); background: var(--primary-bg);
}
.focus-zone-subject {
  font-size: 15px; font-weight: 700; color: var(--text-primary);
  min-width: 50px;
}
.focus-zone-grade {
  font-size: 13px; font-weight: 600; color: var(--primary);
  background: var(--primary-bg); padding: 3px 10px; border-radius: 12px;
}
.focus-zone-chapters { font-size: 13px; color: var(--text-tertiary); margin-left: auto; }
.focus-zone-empty {
  font-size: 14px; color: var(--text-tertiary); text-align: center;
  padding: 24px 0;
}

/* ===== 响应式 - 首页新增 ===== */
@media (max-width: 768px) {
  .dual-column { grid-template-columns: 1fr; gap: 32px; }
  .subject-coverage-grid { grid-template-columns: repeat(3, 1fr); }
  .how-to-grid { flex-direction: column; }
  .how-to-step { max-width: 100%; }
  .focus-zone-grid { grid-template-columns: 1fr; }
}