/* 关于我们 — 树形侧栏 + 右侧图文（复用 docs.css 树形结构） */

.docs-page--about {
  --docs-accent: #2468f2;
  --docs-accent-soft: rgba(36, 104, 242, 0.08);
  --docs-text: #1d2129;
  --docs-muted: #86909c;
  --docs-line: #e8eaed;
  --docs-sidebar-bg: #fafbfc;
  --docs-sidebar-w: 272px;
  background: #fff;
  min-height: calc(100vh - 64px);
}

.docs-page--about .docs-shell {
  grid-template-columns: var(--docs-sidebar-w) minmax(0, 1fr);
  width: 100%;
  max-width: none;
  margin: 0;
  min-height: calc(100vh - 64px);
  border-top: none;
}

.docs-page--about .docs-sidebar {
  top: 64px;
  max-height: calc(100vh - 64px);
  padding: 16px 0 24px;
  border-right: 1px solid var(--docs-line);
  background: var(--docs-sidebar-bg);
  display: flex;
  flex-direction: column;
}

.docs-page--about .docs-sidebar-head {
  margin: 0 0 8px;
  padding: 0 16px 12px;
  border-bottom: 1px solid var(--docs-line);
}

.docs-page--about .docs-sidebar-brand {
  display: block;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--docs-text);
  text-decoration: none !important;
}

.docs-page--about .docs-sidebar-brand:hover {
  color: var(--docs-accent);
}

.docs-page--about .docs-tree {
  flex: 1;
  overflow: auto;
  padding: 8px 0 0;
}

.docs-page--about .docs-tree-empty {
  padding: 12px 16px;
  font-size: 13px;
  line-height: 1.65;
  color: var(--docs-muted);
}

.docs-page--about .docs-tree-list--child {
  padding-left: 0;
  margin-top: 0;
}

.docs-page--about .docs-tree-item {
  margin: 0;
}

.docs-page--about .docs-tree-toggle {
  gap: 4px;
  padding: 8px 16px 8px 12px;
  border-radius: 0;
  font-size: 14px;
  font-weight: 600;
  color: var(--docs-text);
  line-height: 22px;
}

.docs-page--about .docs-tree-toggle:hover {
  background: transparent;
  color: var(--docs-accent);
}

.docs-page--about .docs-tree-chevron::before {
  border-color: #c9cdd4;
}

.docs-page--about .docs-tree-link {
  padding: 8px 16px 8px 28px;
  border-radius: 0;
  border-left: 3px solid transparent;
  font-size: 14px;
  line-height: 22px;
  color: #4e5969;
}

.docs-page--about .docs-tree-list[data-depth="2"] .docs-tree-link {
  padding-left: 40px;
}

.docs-page--about .docs-tree-list[data-depth="3"] .docs-tree-link {
  padding-left: 52px;
}

.docs-page--about .docs-tree-list[data-depth="4"] .docs-tree-link {
  padding-left: 64px;
}

.docs-page--about .docs-tree-link:hover {
  background: var(--docs-accent-soft);
  color: var(--docs-accent);
}

.docs-page--about .docs-tree-item--page.is-active > .docs-tree-link {
  background: var(--docs-accent-soft);
  border-left-color: var(--docs-accent);
  color: var(--docs-accent);
  font-weight: 600;
}

.about-sidebar-foot {
  flex-shrink: 0;
  padding: 12px 16px 0;
  border-top: 1px solid var(--docs-line);
  margin-top: 8px;
}

.about-sidebar-link {
  display: block;
  padding: 8px 12px;
  font-size: 14px;
  font-weight: 600;
  color: #4e5969;
  text-decoration: none !important;
  border-radius: 6px;
}

.about-sidebar-link:hover {
  background: var(--docs-accent-soft);
  color: var(--docs-accent);
}

.docs-page--about .docs-main {
  padding: 36px 48px 72px;
  background: #fff;
}

.docs-page--about .docs-article-head {
  margin-bottom: 28px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--docs-line);
}

.docs-page--about .docs-article-head h1 {
  font-size: 30px;
  font-weight: 700;
  line-height: 1.35;
  color: var(--docs-text);
  letter-spacing: -0.02em;
}

.docs-page--about .docs-lead {
  font-size: 16px;
  line-height: 1.75;
  color: #4e5969;
  max-width: 720px;
}

.docs-page--about .docs-crumb {
  margin-bottom: 12px;
  font-size: 13px;
  color: var(--docs-muted);
}

.docs-page--about .docs-crumb a {
  color: var(--docs-muted);
  text-decoration: none;
}

.docs-page--about .docs-crumb a:hover {
  color: var(--docs-accent);
}

.docs-page--about .docs-meta {
  margin-top: 14px;
  font-size: 13px;
  color: var(--docs-muted);
  gap: 16px;
}

.about-intro {
  max-width: 720px;
}

.about-intro .docs-muted {
  font-size: 15px;
  line-height: 1.8;
  color: var(--docs-muted);
}

.about-index-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.about-index-item {
  display: grid;
  grid-template-columns: 200px minmax(0, 1fr);
  gap: 20px;
  align-items: start;
  padding: 20px;
  border: 1px solid var(--docs-line);
  border-radius: 12px;
  text-decoration: none !important;
  color: inherit;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.about-index-item:hover {
  border-color: #bfdbfe;
  box-shadow: 0 8px 24px rgba(36, 104, 242, 0.08);
}

.about-index-item__cover {
  width: 100%;
  aspect-ratio: 4 / 3;
  border-radius: 8px;
  background-size: cover;
  background-position: center;
  background-color: #f2f3f5;
}

.about-index-item__body h3 {
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 600;
  color: var(--docs-text);
}

.about-index-item:hover .about-index-item__body h3 {
  color: var(--docs-accent);
}

.about-index-item__body p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--docs-muted);
}

.about-article-cover {
  margin-top: 24px;
  width: 100%;
  max-height: 360px;
  aspect-ratio: 21 / 9;
  border-radius: 12px;
  background-size: cover;
  background-position: center;
  background-color: #f2f3f5;
}

.docs-page--about .about-prose,
.docs-page--about .docs-prose {
  max-width: 820px;
  font-size: 16px;
  line-height: 1.85;
  color: #272e3b;
}

.docs-page--about .about-prose h2,
.docs-page--about .docs-prose h2 {
  margin-top: 1.8em;
  font-size: 24px;
  font-weight: 700;
  color: var(--docs-text);
}

.docs-page--about .about-prose h3,
.docs-page--about .docs-prose h3 {
  margin-top: 1.4em;
  font-size: 20px;
  font-weight: 600;
}

.docs-page--about .about-prose p,
.docs-page--about .docs-prose p {
  margin: 0 0 1em;
}

.docs-page--about .about-prose img,
.docs-page--about .docs-prose img {
  max-width: 100%;
  height: auto;
  border-radius: 10px;
  margin: 1.2em 0;
}

.docs-page--about .about-prose blockquote,
.docs-page--about .docs-prose blockquote {
  margin: 1.2em 0;
  padding: 12px 16px;
  border-left: 4px solid var(--docs-accent);
  background: #f7f8fa;
  color: #4e5969;
}

@media (max-width: 960px) {
  .docs-page--about .docs-shell {
    grid-template-columns: 1fr;
  }

  .docs-page--about .docs-sidebar {
    position: static;
    max-height: none;
    border-right: none;
    border-bottom: 1px solid var(--docs-line);
  }

  .docs-page--about .docs-main {
    padding: 24px 16px 48px;
  }

  .about-index-item {
    grid-template-columns: 1fr;
  }
}

/* ===== 联系我们（独立单页，保持原卡片风格） ===== */
.about-site.about-contact-hub,
.about-site.about-contact-page {
  max-width: 1120px;
  margin: 0 auto;
  padding: 48px 24px 80px;
  color: #1d2129;
}

.about-hero {
  text-align: center;
  padding: 40px 0 48px;
}

.about-hero--contact {
  background: linear-gradient(135deg, #f0f5ff 0%, #fff 60%);
  border-radius: 16px;
  padding: 48px 32px;
  margin-bottom: 32px;
}

.about-eyebrow {
  font-size: 13px;
  color: #2468f2;
  font-weight: 600;
  margin: 0 0 8px;
}

.about-hero h1 {
  font-size: clamp(28px, 4vw, 40px);
  margin: 0 0 12px;
  font-weight: 700;
}

.about-lead {
  font-size: 16px;
  color: #4e5969;
  line-height: 1.7;
  max-width: 640px;
  margin: 0 auto;
}

.about-contact-list {
  display: grid;
  gap: 16px;
}

.about-contact-card {
  display: block;
  padding: 24px;
  border: 1px solid #e8eaed;
  border-radius: 12px;
  text-decoration: none;
  color: inherit;
  background: #fff;
}

.about-contact-card:hover {
  border-color: #2468f2;
}

.about-meta {
  display: flex;
  gap: 12px;
  font-size: 12px;
  color: #86909c;
  margin-top: 12px;
}

.about-meta--head {
  margin-top: 16px;
  font-size: 14px;
}

.about-crumb {
  font-size: 13px;
  color: #86909c;
  margin-bottom: 16px;
  text-decoration: none;
}

.about-crumb:hover {
  color: #2468f2;
}

.about-contact-page {
  max-width: 760px;
  margin: 0 auto;
  padding: 40px 24px 80px;
}

.about-contact-page__head h1 {
  font-size: 32px;
  margin: 12px 0 0;
}

.about-contact-page__body {
  margin-top: 28px;
  font-size: 16px;
  line-height: 1.85;
  color: #272e3b;
}

.about-contact-page__body img {
  max-width: 100%;
  height: auto;
  border-radius: 8px;
  margin: 16px 0;
}