/* 旧书纸：刊物目录、叠页投影、书脊与页边注释。纸纹用渐变绘制，无外部纹理依赖。 */
:root {
  --bg: #eae2d1;
  --surface: #fbf5e8;
  --text: #51412f;
  --muted: #806d56;
  --line: #d0bfa4;
  --accent: #8d5435;
  --soft: #f0e4ce;
  --code: #efe4d1;
  --scrollbar: #b4a087;
  --radius: 2px;
  --paper-grain: rgba(126, 93, 52, 0.045);
  font-family: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "SimSun", serif;
}
:root.dark {
  --bg: #211d18;
  --surface: #2c261e;
  --text: #eadfc9;
  --muted: #b9a98c;
  --line: #51442f;
  --accent: #e0b982;
  --soft: #39301f;
  --code: #241f17;
  --scrollbar: #736145;
  --paper-grain: rgba(216, 183, 133, 0.03);
}
body {
  background-image: repeating-linear-gradient(
    0deg,
    var(--paper-grain) 0,
    var(--paper-grain) 1px,
    transparent 1px,
    transparent 4px
  );
}
.site-header {
  background: var(--surface);
  border-bottom: 4px double var(--line);
}
.header-inner {
  min-height: 90px;
}
.brand {
  font-size: 27px;
  font-weight: 600;
  letter-spacing: 3px;
}
.home-shell {
  gap: 40px;
}
.content-column {
  background: var(--surface);
  padding: 26px 36px 32px;
  border: 1px solid var(--line);
  box-shadow:
    5px 5px 0 -1px var(--surface),
    5px 5px 0 var(--line),
    9px 9px 0 -1px var(--surface),
    9px 9px 0 var(--line),
    var(--shadow);
}
.theme-list-heading {
  justify-content: center;
  flex-wrap: wrap;
  padding: 0 0 20px;
  margin-bottom: 0;
  border-bottom: 4px double var(--line);
}
.theme-list-title {
  flex-basis: 100%;
  text-align: center;
  color: var(--text);
  font-size: 24px;
  font-weight: 500;
  letter-spacing: 10px;
  padding-left: 10px;
}
.theme-list-count {
  margin-left: 0;
  font-size: 11px;
  letter-spacing: 2px;
}
.article-card,
.article-card:first-child {
  position: relative;
  padding: 28px 0 28px 40px;
  border-bottom: 1px dashed var(--line);
}
.article-card:last-child {
  border-bottom: 0;
}
.article-card .card-index {
  display: block;
  position: absolute;
  top: 32px;
  left: 0;
  font-size: 16px;
  font-style: italic;
  color: var(--accent);
}
.article-card h2 {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 6px;
  font-size: 25px;
  font-weight: 600;
  letter-spacing: 0.5px;
}
.article-card h2::after {
  content: "";
  min-width: 30px;
  flex: 1;
  border-bottom: 1px dotted var(--line);
}
.pinned {
  margin-left: 3px;
  border-radius: 0;
  font-weight: 400;
}
.card-summary {
  font-size: 16px;
  line-height: 2;
}
.read-more {
  border-bottom: 1px solid var(--line);
}
.home-sidebar {
  padding: 24px;
  border: 4px double var(--line);
  background: var(--surface);
}
.sidebar-section h2 {
  font-size: 17px;
  letter-spacing: 5px;
  font-weight: 500;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}
.sidebar-section + .sidebar-section {
  border-top-style: dashed;
}
.category-list a {
  border-bottom: 1px dotted var(--line);
}
.category-list a:last-child {
  border-bottom: 0;
}
.article-shell > article {
  position: relative;
  padding: 38px 40px;
  border: 1px solid var(--line);
  background: var(--surface);
  box-shadow:
    inset 8px 0 0 var(--soft),
    5px 0 0 -1px var(--surface),
    6px 0 0 var(--line);
}
.article-header {
  text-align: center;
  border-bottom: 4px double var(--line);
  padding-bottom: 32px;
}
.article-header .eyebrow {
  letter-spacing: 5px;
  font-weight: 400;
}
.article-header h1 {
  font-weight: 600;
  letter-spacing: 2px;
}
.article-header .metadata,
.article-header .chips {
  justify-content: center;
}
.prose {
  font-size: 17px;
  line-height: 2.1;
}
.prose h2 {
  font-size: 25px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
  font-weight: 600;
}
.prose blockquote {
  margin-left: 12px;
  margin-right: 12px;
  padding: 12px 22px;
  border-left: 3px double var(--accent);
  background: var(--soft);
}
.prose hr {
  width: 110px;
  border-top: 4px double var(--line);
  margin: 40px auto;
}
.prose img {
  border: 7px solid var(--surface);
  box-shadow:
    0 0 0 1px var(--line),
    3px 3px 0 var(--soft);
}
.toc {
  border-left-style: dashed;
}
.toc > div {
  font-weight: 500;
  letter-spacing: 3px;
}
.chips a {
  border-radius: 0;
}
.site-banners {
  border: 4px double var(--line);
  border-radius: 0;
  box-shadow: none;
}
.site-footer {
  border-top: 4px double var(--line);
}
.article-page > .site-header {
  background: var(--surface);
}
.theme-toggle,
.search-toggle {
  border-radius: 2px;
}
.reader-dialog .reader-dialog-header {
  background: var(--surface);
  border-bottom: 4px double var(--line);
}
.reader-dialog .reader-dialog-header h2 {
  font-weight: 500;
  letter-spacing: 3px;
}
@media (hover: hover) and (pointer: fine) {
  .article-card:hover {
    transform: translateX(3px);
  }
}
@media (max-width: 760px) {
  .header-inner {
    min-height: 74px;
  }
  .brand {
    font-size: 22px;
    letter-spacing: 2px;
  }
  .shell {
    padding: 24px 18px 36px;
  }
  .content-column {
    padding: 24px 20px;
  }
  .theme-list-title {
    font-size: 22px;
  }
  .article-card,
  .article-card:first-child {
    padding: 24px 0 24px 30px;
  }
  .article-card .card-index {
    top: 29px;
    font-size: 13px;
  }
  .article-card h2 {
    font-size: 23px;
  }
  .article-shell > article {
    padding: 26px 22px;
  }
  .card-summary,
  .prose {
    font-size: 16px;
  }
  .site-footer {
    width: calc(100% - 36px);
  }
}