/* SEO 静态页样式 —— 按 DESIGN-vercel.md 设计 token 实现（ink/body/mute/hairline/link 等） */
:root {
  --ink: #171717;
  --body: #4d4d4d;
  --mute: #888888;
  --hairline: #ebebeb;
  --hairline-strong: #a1a1a1;
  --canvas: #ffffff;
  --canvas-soft: #fafafa;
  --canvas-soft-2: #f5f5f5;
  --link: #0070f3;
  --link-deep: #0761d1;
  --warning-soft: #ffefcf;
  --warning-deep: #ab570a;
  --font-sans: Inter, system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, monospace;
}

* { box-sizing: border-box; }
::selection { background: #171717; color: #f2f2f2; }

html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  color: var(--body);
  background: var(--canvas);
}

.container { max-width: 780px; margin: 0 auto; padding: 0 20px; }

a { color: var(--link); text-decoration: none; }
a:hover { color: var(--link-deep); text-decoration: underline; }

h1, h2, h3 { color: var(--ink); font-weight: 600; line-height: 1.35; }
h1 { font-size: 26px; letter-spacing: -0.6px; margin: 20px 0 12px; }
h2 { font-size: 20px; letter-spacing: -0.4px; margin: 36px 0 12px; }

.mono { font-family: var(--font-mono); font-size: 13px; }

/* 头部 */
.site-header { border-bottom: 1px solid var(--hairline); background: var(--canvas); }
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 60px; }
.brand { font-size: 17px; font-weight: 700; color: var(--ink); }
.brand:hover { text-decoration: none; color: var(--ink); }
.nav { display: flex; align-items: center; gap: 20px; }
.nav a { color: var(--body); font-size: 14px; }
.nav a:hover { color: var(--ink); text-decoration: none; }

/* 按钮 */
.btn {
  display: inline-block; border-radius: 6px; font-weight: 500; font-size: 14px;
  line-height: 20px; padding: 7px 14px; border: 1px solid transparent;
}
.btn-primary { background: var(--ink); color: #fff !important; }
.btn-primary:hover { background: #383838; text-decoration: none; }
.btn-lg { font-size: 16px; padding: 10px 22px; }

/* 面包屑 */
.breadcrumb { margin: 20px 0 4px; font-size: 13px; color: var(--mute); }
.breadcrumb a { color: var(--mute); }
.breadcrumb a:hover { color: var(--ink); }
.breadcrumb span { margin: 0 8px; color: var(--hairline-strong); }

/* 文档详情 */
.doc-meta {
  display: flex; flex-wrap: wrap; gap: 8px 18px; align-items: center;
  padding-bottom: 16px; border-bottom: 1px solid var(--hairline);
  font-size: 13px; color: var(--mute);
}
.doc-meta .mono { background: var(--canvas-soft-2); padding: 2px 8px; border-radius: 4px; color: var(--ink); }

.ai-summary {
  margin: 24px 0; padding: 18px 20px; background: var(--canvas-soft);
  border: 1px solid var(--hairline); border-radius: 8px;
}
.ai-summary-label {
  font-size: 12px; font-weight: 600; letter-spacing: 1px; color: var(--mute);
  text-transform: uppercase; margin-bottom: 6px;
}
.ai-summary p { margin: 0; color: var(--ink); }

.key-points dl { margin: 0; border: 1px solid var(--hairline); border-radius: 8px; overflow: hidden; }
.kp-row { display: flex; gap: 16px; padding: 12px 16px; }
.kp-row + .kp-row { border-top: 1px solid var(--hairline); }
.kp-row dt { flex: 0 0 82px; font-weight: 500; color: var(--ink); font-size: 14px; }
.kp-row dd { margin: 0; font-size: 14px; }

.doc-body { margin-top: 8px; }
.doc-body img { max-width: 100%; height: auto; }
.doc-body table { border-collapse: collapse; max-width: 100%; margin: 12px 0; font-size: 14px; }
.doc-body table td, .doc-body table th { border: 1px solid var(--hairline); padding: 6px 10px; }
.doc-body p { margin: 12px 0; }

.attachments ul { padding-left: 20px; }
.attachments .att-type { margin-left: 10px; color: var(--mute); text-transform: uppercase; font-size: 11px; }

/* FAQ */
.faq details { border: 1px solid var(--hairline); border-radius: 8px; padding: 12px 16px; margin: 10px 0; }
.faq summary { cursor: pointer; font-weight: 500; color: var(--ink); font-size: 15px; }
.faq details p { margin: 10px 0 2px; font-size: 14px; }
.faq-more { margin-top: 14px; font-size: 14px; color: var(--mute); }
.faq-more a { color: var(--link); text-decoration: none; }
.faq-more a:hover { text-decoration: underline; }

/* 相关政策 / 列表页 */
.related ul { padding-left: 20px; }
.related .date { margin-left: 10px; font-size: 12px; color: var(--mute); }

.page-intro { color: var(--mute); font-size: 14px; margin-top: 0; }

.doc-list { list-style: none; padding: 0; margin: 20px 0; }
.doc-list li { padding: 16px 0; border-bottom: 1px solid var(--hairline); }
.doc-list-title { font-size: 16px; font-weight: 500; color: var(--ink); }
.doc-list-title:hover { color: var(--link); }
.doc-list-meta { display: flex; flex-wrap: wrap; gap: 6px 14px; margin-top: 4px; font-size: 12px; color: var(--mute); }
.doc-list-summary { margin: 6px 0 0; font-size: 13px; color: var(--body);
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }

.pagination { display: flex; align-items: center; gap: 18px; margin: 24px 0; font-size: 14px; color: var(--mute); }

/* 分类树（hub 页） */
.cat-group { margin: 24px 0; }
.cat-group h2 { margin: 0 0 8px; font-size: 17px; }
.cat-group .count { margin-left: 10px; font-size: 12px; font-weight: 400; color: var(--mute); }
.cat-children { list-style: none; padding: 0; margin: 0; display: flex; flex-wrap: wrap; gap: 8px; }
.cat-children li {
  border: 1px solid var(--hairline); border-radius: 6px; padding: 5px 12px; font-size: 13px;
}
.cat-children li:hover { border-color: var(--hairline-strong); }
.cat-children .count { margin-left: 6px; color: var(--mute); font-size: 12px; }

/* CTA */
.cta {
  margin: 36px 0; padding: 24px; text-align: center;
  border: 1px solid var(--hairline); border-radius: 8px; background: var(--canvas-soft);
}
.cta-title { font-size: 18px; font-weight: 600; color: var(--ink); }
.cta p { font-size: 14px; color: var(--body); margin: 8px auto 16px; max-width: 460px; }


/* 底部 */
.site-footer { margin-top: 48px; border-top: 1px solid var(--hairline); padding: 24px 0 40px; }
.site-footer p { font-size: 12px; color: var(--mute); margin: 6px 0; }

@media (max-width: 640px) {
  h1 { font-size: 22px; }
  .header-inner { height: 52px; }
  .nav { gap: 12px; }
  .kp-row { flex-direction: column; gap: 2px; }
  .kp-row dt { flex: none; }
}