/* ===== 收录范围页 · 页面专属样式 ===== */
.page-about {
  --about-tree-line: rgba(255, 255, 255, 0.2);
}

/* ---------- 首屏指标条 ---------- */
.page-about .about-hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 30px;
}

.page-about .about-stat {
  flex: 1 1 140px;
  min-width: 130px;
  padding: 16px 18px;
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
}

.page-about .about-stat-num {
  font-family: var(--font-mono);
  font-size: 28px;
  font-weight: 700;
  color: var(--color-navy);
  line-height: 1.2;
}

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

/* ---------- 首屏入口磁贴 ---------- */
.page-about .about-hero-tiles {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-top: 24px;
}

.page-about .about-hero-tile {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 16px 18px;
  border-radius: var(--radius-md);
  color: #fff;
  text-decoration: none;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.page-about .about-hero-tile:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.page-about .about-hero-tile--ochre {
  background: var(--color-ochre);
}

.page-about .about-hero-tile--olive {
  background: var(--color-olive);
}

.page-about .about-hero-tile--teal {
  background: var(--color-teal);
}

.page-about .about-hero-tile--purple {
  background: var(--color-purple);
}

.page-about .about-hero-tile-name {
  font-weight: 700;
  font-size: 16px;
}

.page-about .about-hero-tile-count {
  font-family: var(--font-mono);
  font-size: 13px;
  opacity: 0.85;
}

/* ---------- 收录范围 · 分栏 ---------- */
.page-about .about-coverage-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
}

.page-about .about-coverage-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.page-about .about-coverage-type {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px;
  background: var(--color-faint);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
}

.page-about .about-coverage-name {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  font-size: 15px;
}

.page-about .about-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  display: inline-block;
  flex-shrink: 0;
}

.page-about .about-dot--ochre {
  background: var(--color-ochre);
}

.page-about .about-dot--olive {
  background: var(--color-olive);
}

.page-about .about-dot--teal {
  background: var(--color-teal);
}

.page-about .about-dot--purple {
  background: var(--color-purple);
}

.page-about .about-coverage-count {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  color: var(--color-navy);
}

.page-about .about-coverage-total {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px;
  background: var(--color-deep);
  color: #fff;
  border-radius: var(--radius-md);
}

.page-about .about-coverage-total .about-coverage-name {
  color: #fff;
}

.page-about .about-coverage-total .about-coverage-count {
  color: var(--color-amber);
  font-size: 20px;
}

.page-about .about-coverage-links {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 6px;
}

/* ---------- 收录范围 · 右侧视觉 ---------- */
.page-about .about-coverage-visual {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.page-about .about-total-card {
  background: var(--color-navy);
  border-radius: var(--radius-lg);
  padding: 24px;
  color: #fff;
  text-align: center;
  box-shadow: var(--shadow-md);
}

.page-about .about-total-label {
  display: block;
  font-size: 14px;
  color: rgba(255, 255, 255, 0.72);
}

.page-about .about-total-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 46px;
  font-weight: 700;
  color: var(--color-amber);
  line-height: 1.15;
  margin-top: 6px;
}

.page-about .about-total-sub {
  display: block;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.62);
  margin-top: 8px;
}

.page-about .about-chart {
  padding: 20px;
  background: var(--color-cream);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-line);
}

.page-about .about-chart-row {
  display: grid;
  grid-template-columns: 50px 1fr 62px;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
}

.page-about .about-chart-row:last-child {
  margin-bottom: 0;
}

.page-about .about-chart-label {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-text-soft);
}

.page-about .about-chart-bar {
  height: 16px;
  background: rgba(0, 0, 0, 0.06);
  border-radius: var(--radius-pill);
  overflow: hidden;
}

.page-about .about-chart-fill {
  display: block;
  height: 100%;
  border-radius: var(--radius-pill);
}

.page-about .about-chart-fill--ochre {
  background: var(--color-ochre);
}

.page-about .about-chart-fill--olive {
  background: var(--color-olive);
}

.page-about .about-chart-fill--teal {
  background: var(--color-teal);
}

.page-about .about-chart-fill--purple {
  background: var(--color-purple);
}

.page-about .about-chart-value {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  color: var(--color-text);
  text-align: right;
}

.page-about .about-coverage-img {
  width: 100%;
  max-width: 400px;
  height: auto;
  border-radius: var(--radius-md);
  object-fit: cover;
  margin: 0 auto;
  box-shadow: var(--shadow-sm);
}

/* ---------- 分类体系 · 树状目录 ---------- */
.page-about .about-category-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
}

.page-about .about-tree {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.page-about .about-tree-branch {
  background: var(--color-navy);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.page-about .about-tree-label {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 16px 18px;
  font-weight: 700;
  font-size: 17px;
  color: #fff;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.page-about .about-tree-label::before {
  content: "";
  width: 14px;
  height: 14px;
  border-left: 2px solid rgba(255, 255, 255, 0.35);
  border-bottom: 2px solid rgba(255, 255, 255, 0.35);
  border-radius: 0 0 0 4px;
  flex-shrink: 0;
}

.page-about .about-tree-label em {
  font-style: normal;
  font-family: var(--font-mono);
  font-size: 13px;
  color: rgba(255, 255, 255, 0.55);
  margin-left: auto;
}

.page-about .about-tree-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  display: inline-block;
  flex-shrink: 0;
}

.page-about .about-tree-dot--ochre {
  background: var(--color-ochre);
}

.page-about .about-tree-dot--olive {
  background: var(--color-olive);
}

.page-about .about-tree-dot--teal {
  background: var(--color-teal);
}

.page-about .about-tree-dot--purple {
  background: var(--color-purple);
}

.page-about .about-tree-children {
  list-style: none;
  margin: 0;
  padding: 14px 18px;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(108px, 1fr));
  gap: 8px;
}

.page-about .about-tree-children li {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.88);
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-sm);
  padding: 8px 10px;
  text-align: center;
}

.page-about .about-tree-side {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.page-about .about-tree-side-card {
  background: var(--color-deep);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-lg);
  padding: 24px;
  color: #fff;
  box-shadow: var(--shadow-md);
}

.page-about .about-tree-side-card p {
  color: rgba(255, 255, 255, 0.72);
  margin: 14px 0 16px;
  font-size: 15px;
  line-height: 1.7;
}

.page-about .about-tree-side img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  object-fit: cover;
  box-shadow: var(--shadow-md);
}

/* ---------- 分类体系 · 深色分区标题适配 ---------- */
.page-about .section--dark .section-title,
.page-about .section--navy .section-title {
  color: #fff;
}

.page-about .section--dark .section-meta,
.page-about .section--navy .section-meta {
  color: rgba(255, 255, 255, 0.58);
}

/* ---------- 更新机制 · 时间线 ---------- */
.page-about .about-update-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
}

.page-about .about-timeline {
  position: relative;
  padding-left: 28px;
  display: flex;
  flex-direction: column;
  gap: 22px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: var(--color-line);
}

.page-about .about-timeline-item {
  position: relative;
}

.page-about .about-timeline-dot {
  position: absolute;
  left: -25px;
  top: 6px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  border: 3px solid #fff;
  box-shadow: var(--shadow-sm);
}

.page-about .about-timeline-dot--amber {
  background: var(--color-amber);
}

.page-about .about-timeline-dot--coral {
  background: var(--color-coral);
}

.page-about .about-timeline-dot--teal {
  background: var(--color-teal);
}

.page-about .about-timeline-dot--purple {
  background: var(--color-purple);
}

.page-about .about-timeline-content {
  background: #fff;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 20px;
  box-shadow: var(--shadow-sm);
}

.page-about .about-timeline-content h3 {
  font-family: var(--font-serif);
  font-size: 20px;
  margin: 0 0 6px;
  color: var(--color-text);
}

.page-about .about-timeline-content p {
  margin: 0;
  color: var(--color-text-soft);
  font-size: 15px;
  line-height: 1.7;
}

.page-about .about-inline-link {
  display: inline-block;
  margin-top: 10px;
  color: var(--color-teal);
  text-decoration: none;
  font-weight: 600;
  font-size: 14px;
}

.page-about .about-inline-link:hover {
  color: var(--color-amber);
}

.page-about .about-update-side {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.page-about .about-update-side img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  object-fit: cover;
  box-shadow: var(--shadow-sm);
}

.page-about .about-update-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-update-note {
  background: var(--color-deep);
  border-radius: var(--radius-md);
  padding: 20px;
  color: #fff;
  box-shadow: var(--shadow-sm);
}

.page-about .about-update-note h3 {
  margin: 0 0 6px;
  font-family: var(--font-serif);
  font-size: 18px;
}

.page-about .about-update-note p {
  margin: 0;
  color: rgba(255, 255, 255, 0.72);
  font-size: 14px;
  line-height: 1.7;
}

/* ---------- 检索路径 · 流程图 ---------- */
.page-about .about-flow {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.page-about .about-flow-step {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: var(--radius-md);
  padding: 18px 20px;
  position: relative;
}

.page-about .about-flow-step h3 {
  font-family: var(--font-serif);
  font-size: 18px;
  margin: 0 0 6px;
  color: #fff;
}

.page-about .about-flow-step p {
  margin: 0;
  font-size: 14px;
  color: rgba(255, 255, 255, 0.68);
  line-height: 1.7;
}

.page-about .about-flow-num {
  position: absolute;
  top: 14px;
  right: 18px;
  font-family: var(--font-mono);
  font-size: 28px;
  font-weight: 700;
  color: var(--color-amber);
  opacity: 0.4;
}

.page-about .about-flow-arrow {
  color: var(--color-amber);
  font-size: 22px;
  text-align: center;
  line-height: 1;
  transform: rotate(90deg);
  opacity: 0.8;
}

/* ---------- 检索路径 · 快捷键与入口 ---------- */
.page-about .about-search-bottom {
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin-top: 28px;
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.14);
}

.page-about .about-shortcuts {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-shortcut {
  display: flex;
  align-items: center;
  gap: 10px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: var(--radius-pill);
  padding: 8px 14px;
}

.page-about .about-shortcut-key {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  background: var(--color-amber);
  color: var(--color-text);
  border-radius: var(--radius-sm);
  padding: 2px 8px;
}

.page-about .about-shortcut-label {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.8);
}

.page-about .about-search-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 标签云 ---------- */
.page-about .about-tagcloud {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
}

.page-about .tag-lg {
  font-size: 17px;
  padding: 10px 16px;
}

.page-about .tag-md {
  font-size: 15px;
  padding: 8px 14px;
}

.page-about .tag-sm {
  font-size: 13px;
  padding: 6px 10px;
}

/* ---------- 桌面端适配 ---------- */
@media (min-width: 900px) {
  .page-about .about-hero-meta {
    gap: 20px;
  }

  .page-about .about-stat {
    flex: 1 1 0;
  }

  .page-about .about-hero-tiles {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-about .about-coverage-grid {
    grid-template-columns: 1fr 1fr;
    align-items: start;
  }

  .page-about .about-coverage-list {
    gap: 12px;
  }

  .page-about .about-category-grid {
    grid-template-columns: 1.1fr 0.9fr;
    align-items: start;
  }

  .page-about .about-update-grid {
    grid-template-columns: 1.1fr 0.9fr;
    align-items: start;
  }

  .page-about .about-flow {
    flex-direction: row;
    align-items: stretch;
    gap: 10px;
  }

  .page-about .about-flow-step {
    flex: 1;
  }

  .page-about .about-flow-arrow {
    transform: none;
    align-self: center;
    flex-shrink: 0;
  }

  .page-about .about-search-bottom {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }

  .page-about .about-tagcloud {
    max-width: 860px;
  }
}