/* 文档书：左侧书目、连续章节索引和窄行长正文，强调知识结构而非装饰卡片。 */
:root {
  --bg: #fff;
  --surface: #fff;
  --text: #273444;
  --muted: #68798c;
  --line: #e0e6ed;
  --accent: #2864b0;
  --soft: #eff5fc;
  --code: #f3f6fa;
  --scrollbar: #b8c6d5;
  --radius: 7px;
  --chapter: #dbe9fa;
}
:root.dark {
  --bg: #171d26;
  --surface: #1c2531;
  --text: #e2eaf4;
  --muted: #a0b0c4;
  --line: #323f50;
  --accent: #8dbaf4;
  --soft: #233449;
  --code: #1d2837;
  --scrollbar: #4b5f78;
  --chapter: #2c4664;
}
.site-header {
  border-bottom: 1px solid var(--line);
  background: var(--bg);
}
.header-inner {
  max-width: 1320px;
  min-height: 72px;
}
.brand {
  font-size: 21px;
  font-weight: 700;
}
.home-shell {
  max-width: 1320px;
  grid-template-columns: 224px minmax(0, 1fr);
  gap: 52px;
}
.home-shell > .content-column {
  grid-column: 2;
  grid-row: 1;
  max-width: 860px;
}
.home-sidebar {
  grid-column: 1;
  grid-row: 1;
  border-left: 0;
  border-right: 1px solid var(--line);
  padding: 0 24px 24px 0;
  position: sticky;
  top: 24px;
  max-height: 80vh;
  overflow: auto;
}
.sidebar-section h2 {
  color: var(--muted);
  font-size: 12px;
  letter-spacing: 2px;
}
.category-list a {
  border-radius: 5px;
  padding: 8px 10px;
  margin: 0;
  border-left: 2px solid transparent;
}
.category-list a:hover {
  background: var(--soft);
  border-left-color: var(--accent);
  padding-left: 10px;
}
.theme-list-heading {
  padding-bottom: 20px;
  margin-bottom: 0;
  border-bottom: 1px solid var(--line);
  align-items: baseline;
}
.theme-list-title {
  font-size: 26px;
  letter-spacing: -0.3px;
  font-weight: 650;
  color: var(--text);
}
.theme-list-count {
  font-size: 12px;
}
.article-card,
.article-card:first-child {
  position: relative;
  padding: 28px 16px 28px 64px;
  border-bottom: 1px solid var(--line);
  background: transparent;
}
.article-card .card-index {
  display: grid;
  place-items: center;
  position: absolute;
  left: 0;
  top: 30px;
  width: 40px;
  height: 40px;
  color: var(--accent);
  background: var(--soft);
  border: 1px solid var(--chapter);
  border-radius: 6px;
  font-size: 13px;
  font-weight: 600;
}
.article-card h2 {
  font-size: 23px;
  font-weight: 650;
  letter-spacing: -0.3px;
}
.article-card:hover {
  background: var(--soft);
  border-radius: 7px;
}
.card-summary {
  line-height: 1.85;
  font-size: 14px;
  -webkit-line-clamp: 2;
}
.read-more {
  font-size: 12px;
}
.pinned {
  border: 0;
  background: var(--chapter);
  border-radius: 3px;
}
.site-banners {
  box-shadow: none;
  border: 1px solid var(--line);
}
.article-shell {
  max-width: 1320px;
  gap: 28px 52px;
  grid-template-columns: 224px minmax(0, 1fr);
}
.article-shell > article {
  grid-column: 2;
  grid-row: 2;
  max-width: 860px;
}
.article-shell .toc {
  grid-column: 1;
  grid-row: 2;
  border-left: 0;
  border-right: 1px solid var(--line);
  padding: 0 24px 0 0;
}
.toc > div {
  color: var(--muted);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 2px;
}
.toc nav {
  gap: 3px;
}
.toc nav a {
  border-radius: 4px;
  padding: 7px 10px;
}
.toc nav a.level-3 {
  padding-left: 22px;
}
.toc nav a:hover {
  color: var(--accent);
  background: var(--soft);
}
.article-header {
  border-bottom: 0;
  margin-bottom: 26px;
  padding-bottom: 0;
}
.article-header .eyebrow {
  color: var(--accent);
  font-size: 12px;
  letter-spacing: 2px;
}
.article-header h1 {
  font-size: 36px;
  letter-spacing: -0.5px;
}
.article-header .metadata {
  padding-bottom: 24px;
  border-bottom: 1px solid var(--line);
}
.chips a {
  border: 1px solid var(--chapter);
  border-radius: 4px;
}
.prose h2 {
  border-bottom: 1px solid var(--line);
  padding-bottom: 10px;
  font-size: 25px;
}
.prose blockquote {
  background: var(--soft);
  border: 1px solid var(--chapter);
  border-left: 3px solid var(--accent);
  border-radius: 5px;
  padding: 10px 22px;
  color: var(--text);
  font-size: 15px;
}
.prose pre {
  border: 1px solid var(--line);
  border-top-width: 3px;
}
.article-shell article > .pagination a {
  display: block;
  border: 1px solid var(--line);
  border-radius: 7px;
  padding: 12px 18px;
}
.article-shell article > .pagination a:hover {
  border-color: var(--accent);
  background: var(--soft);
}
.site-footer {
  max-width: 1256px;
}
.reader-dialog .reader-dialog-header {
  background: var(--bg);
}
@media (hover: hover) and (pointer: fine) {
  .article-card:hover {
    transform: none;
  }
}
@media (max-width: 980px) {
  .home-shell {
    grid-template-columns: 190px minmax(0, 1fr);
    gap: 28px;
  }
  .article-shell {
    display: block;
    max-width: 900px;
  }
  .article-header h1 {
    font-size: 30px;
  }
}
@media (max-width: 760px) {
  .home-shell {
    display: block;
  }
  .shell {
    padding: 24px 20px 36px;
  }
  .header-inner {
    min-height: 68px;
  }
  .theme-list-title {
    font-size: 22px;
  }
  .article-card,
  .article-card:first-child {
    padding: 24px 0 24px 50px;
  }
  .article-card .card-index {
    width: 34px;
    height: 34px;
    top: 26px;
    font-size: 12px;
  }
  .article-card h2 {
    font-size: 21px;
  }
  .article-header h1 {
    font-size: 28px;
  }
  .site-footer {
    width: calc(100% - 40px);
  }
}