:root {
  --color-surface: #f4f3f3;
  --color-surface-alt: #eceaea;
  --color-surface-deep: #e0dede;
  --color-ink: #4e4042;
  --color-ink-soft: #7a6668;
  --color-ink-muted: #897677;
  --color-line: #d6d3d3;
  --color-primary: #cc3340;
  --color-primary-ink: #ffffff;
  --color-primary-soft: #eed8da;
  --color-accent: #9b6b21;
  --color-accent-ink: #ffffff;
  --color-highlight: #e4dbcd;
  --color-focus: #936115;
  --color-contrast-surface: #1f1213;
  --color-contrast-ink: #e7e4e4;
  --color-contrast-line: #4b4041;
  --color-contrast-accent: #d2902d;
  --overlay-scrim: linear-gradient(180deg, rgba(31, 18, 19, 0.35) 0%, rgba(31, 18, 19, 0.72) 55%, rgba(31, 18, 19, 0.92) 100%);
  --font-heading: "Songti SC", STSong, "Source Han Serif SC", SimSun, serif;
  --font-body: "Songti SC", STSong, "Source Han Serif SC", SimSun, serif;
  --font-mono: ui-monospace, Menlo, Consolas, monospace;
  --text-xs: 12.9px;
  --text-sm: 16.1px;
  --text-base: 18px;
  --text-lg: 22.5px;
  --text-xl: 28.1px;
  --text-2xl: 35.2px;
  --text-3xl: 43.9px;
  --text-4xl: 54.9px;
  --text-display: clamp(34px, 5.9vw, 75px);
  --text-figure: clamp(28px, 4.2vw, 54px);
  --weight-heading: 525;
  --weight-body: 400;
  --leading-body: 1.9;
  --leading-heading: 1.22;
  --tracking-heading: 0.01em;
  --radius-sm: 0px;
  --radius-md: 1px;
  --radius-lg: 2px;
  --radius-pill: 2px;
  --border-thin: 1px;
  --border-thick: 2px;
  --shadow-1: none;
  --shadow-2: none;
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-6: 48px;
  --space-8: 64px;
  --container: 1020px;
  --measure: 72ch;
  --gutter: 32px;
  --section-y: 80px;
  --section-y-lg: 112px;
}

/* ============ 01 基础重置 ============ */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--color-surface);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: var(--weight-body);
  line-height: var(--leading-body);
}
img, svg, video { display: block; max-width: 100%; height: auto; }
h1, h2, h3, h4, h5, h6, p, ul, ol, dl, dd, figure, blockquote { margin: 0; }
ul, ol { padding: 0; list-style: none; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; padding: 0; cursor: pointer; }
table { border-collapse: collapse; width: 100%; }
[hidden] { display: none !important; }
:focus-visible { outline: 2px solid var(--color-focus); outline-offset: 2px; }

h1, h2, h3, h4 {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}
h1 { font-size: var(--text-3xl); }
h2 { font-size: var(--text-2xl); }
h3 { font-size: var(--text-xl); }
h4 { font-size: var(--text-lg); }
strong { font-weight: var(--weight-heading); }

/* ============ 02 排版辅助 ============ */
.display-title {
  font-family: var(--font-heading);
  font-size: var(--text-display);
  line-height: 1.04;
  letter-spacing: -0.01em;
  font-weight: var(--weight-heading);
}
.lede { font-size: var(--text-lg); line-height: 1.7; color: var(--color-ink); }
.eyebrow {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.22em;
  color: var(--color-accent);
  text-transform: uppercase;
}
.meta { font-size: var(--text-xs); color: var(--color-ink-muted); font-variant-numeric: tabular-nums; }
.num { font-variant-numeric: tabular-nums lining-nums; text-align: right; }
.mark { background: var(--color-highlight); padding: 0 0.2em; -webkit-box-decoration-break: clone; box-decoration-break: clone; }
.mark--line { background: none; border-bottom: 2px solid var(--color-primary); padding-bottom: 1px; }

/* ============ 03 布局 ============ */
.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding-left: var(--space-3);
  padding-right: var(--space-3);
}
.section { padding-top: var(--section-y); padding-bottom: var(--section-y); }
.section--lg { padding-top: var(--section-y-lg); padding-bottom: var(--section-y-lg); }
.section--alt { background: var(--color-surface-alt); }
.section__head {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: var(--space-2);
  max-width: var(--measure);
  margin: 0 auto var(--space-6);
}
.section__index {
  position: relative;
  padding-bottom: 12px;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.28em;
  color: var(--color-primary);
  font-variant-numeric: tabular-nums;
}
.section__index::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 0;
  width: 0;
  height: 2px;
  background: var(--color-primary);
  transform: translateX(-50%);
  transition: width 0.24s ease;
}
.reveal.is-visible .section__index::after, .section__head .section__index::after { width: 36px; }
.section__title { font-size: var(--text-2xl); }
.section__lede { font-size: var(--text-base); color: var(--color-ink-soft); max-width: 56ch; }

.grid { display: grid; gap: var(--gutter); }
.grid--12 { display: grid; grid-template-columns: repeat(12, minmax(0, 1fr)); gap: var(--gutter); }
.grid--2 { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--gutter); }
.grid--3 { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--gutter); }
.grid--4 { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: var(--gutter); }
.grid--7-5 { display: grid; grid-template-columns: 7fr 5fr; gap: var(--gutter); }
.grid--5-7 { display: grid; grid-template-columns: 5fr 7fr; gap: var(--gutter); }
.span-3 { grid-column: span 3; }
.span-4 { grid-column: span 4; }
.span-5 { grid-column: span 5; }
.span-6 { grid-column: span 6; }
.span-7 { grid-column: span 7; }
.span-8 { grid-column: span 8; }
.span-12 { grid-column: span 12; }
.stack { display: grid; gap: var(--space-3); }
.stack--sm { gap: var(--space-2); }

/* ============ 04 分隔语言 ============ */
.rule-double {
  height: 0;
  margin: 0;
  border: 0;
  border-top: 3px double var(--color-line);
}
.rule-double--primary { border-top-color: var(--color-primary); }
.offside-line { position: relative; height: 1px; margin: var(--space-4) 0; background: var(--color-primary); }
.offside-line::after {
  content: "";
  position: absolute;
  right: 0;
  top: -2px;
  width: 5px;
  height: 5px;
  background: var(--color-primary);
}
.fret-rule {
  height: 6px;
  border-bottom: 1px solid var(--color-line);
  background-image:
    repeating-linear-gradient(90deg, var(--color-primary) 0 2px, transparent 2px 80px),
    repeating-linear-gradient(90deg, var(--color-line) 0 1px, transparent 1px 10px);
  background-size: 80px 3px, 10px 3px;
  background-repeat: repeat-x;
  background-position: 0 0, 0 0;
}

/* ============ 05 头部命令栏 ============ */
.site-header {
  position: -webkit-sticky;
  position: sticky;
  top: 0;
  z-index: 60;
  background: var(--color-surface);
  border-bottom: 3px double var(--color-line);
}
.skip-link {
  position: absolute;
  left: var(--space-3);
  top: -120px;
  z-index: 90;
  padding: 10px 18px;
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  letter-spacing: 0.08em;
  border-radius: var(--radius-sm);
  transition: top 0.15s ease;
}
.skip-link:focus { top: var(--space-2); }
.site-header__inner {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: var(--space-2) var(--space-3);
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: center;
  gap: var(--space-2) var(--space-4);
}
.site-header__brand { grid-column: 1; grid-row: 1; min-width: 0; }
.brand {
  display: inline-block;
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  letter-spacing: 0.1em;
  line-height: 1.2;
  color: var(--color-ink);
}
.brand::after {
  content: "";
  display: block;
  width: 30px;
  height: 2px;
  margin-top: 6px;
  background: var(--color-primary);
}
.brand__index {
  display: block;
  margin-top: 8px;
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  color: var(--color-ink-muted);
}
.nav-toggle {
  display: none;
  grid-column: 2;
  grid-row: 1;
  justify-self: end;
  align-items: center;
  gap: 10px;
  min-height: 44px;
  padding: 0 var(--space-2);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  letter-spacing: 0.12em;
  color: var(--color-ink);
}
.nav-toggle:hover { border-color: var(--color-primary); color: var(--color-primary); }
.nav-toggle__bars { position: relative; display: block; width: 16px; height: 2px; background: var(--color-primary); }
.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 16px;
  height: 2px;
  background: var(--color-primary);
}
.nav-toggle__bars::before { top: -5px; }
.nav-toggle__bars::after { top: 5px; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars { background: transparent; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before { top: 0; transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after { top: 0; transform: rotate(-45deg); }
.nav-toggle__label { white-space: nowrap; }

.site-nav {
  grid-column: 2;
  grid-row: 1;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--space-4);
  min-width: 0;
}
.site-nav__list { display: flex; flex-wrap: wrap; align-items: center; gap: 0 var(--space-1); }
.site-nav__link {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 8px 10px;
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  letter-spacing: 0.08em;
  color: var(--color-ink);
  border-radius: var(--radius-sm);
  transition: color 0.16s ease, background-color 0.16s ease;
}
.site-nav__link:hover { color: var(--color-primary); background: var(--color-surface-alt); }
.site-nav__num {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
  color: var(--color-ink-muted);
  font-variant-numeric: tabular-nums;
}
.site-nav__link[aria-current="page"] { padding-left: 16px; color: var(--color-primary); }
.site-nav__link[aria-current="page"]::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 5px;
  height: 5px;
  background: var(--color-primary);
}
.site-nav__link[aria-current="page"] .site-nav__num { color: var(--color-primary); }
.site-nav__aside {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 6px;
  padding-left: var(--space-4);
  border-left: 1px solid var(--color-line);
}
.snapshot-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding-bottom: 2px;
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  letter-spacing: 0.1em;
  color: var(--color-ink);
  border-bottom: 2px solid var(--color-primary);
}
.snapshot-link:hover { color: var(--color-primary); }
.snapshot-link__mark { display: inline-block; width: 7px; height: 7px; background: var(--color-primary); border-radius: var(--radius-sm); }
.sync-note {
  max-width: 22ch;
  text-align: right;
  font-size: var(--text-xs);
  line-height: 1.5;
  letter-spacing: 0.04em;
  color: var(--color-ink-muted);
}
.read-progress { position: absolute; left: 0; right: 0; bottom: 0; height: 2px; background: transparent; }
.read-progress__bar {
  display: block;
  width: 0;
  height: 100%;
  background: var(--color-primary);
  transition: width 0.1s linear;
}

/* ============ 06 页脚 ============ */
.site-footer {
  margin-top: var(--section-y);
  padding: var(--space-4) 0 var(--space-6);
  background: var(--color-surface);
  border-top: 3px double var(--color-line);
}
.site-footer__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-1);
  text-align: center;
}
.site-footer__line {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 4px 0;
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
}
.site-footer__line > * + *::before { content: "·"; margin: 0 10px; color: var(--color-line); }
.site-footer__brand {
  font-family: var(--font-heading);
  letter-spacing: 0.12em;
  color: var(--color-ink);
  border-bottom: 2px solid var(--color-primary);
  padding-bottom: 2px;
}
.site-footer__link { color: var(--color-ink-soft); border-bottom: 1px solid transparent; }
.site-footer__link:hover { color: var(--color-primary); border-bottom-color: var(--color-primary); }
.site-footer__meta { font-size: var(--text-xs); color: var(--color-ink-muted); font-variant-numeric: tabular-nums; }
.site-footer__contact {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.02em;
  color: var(--color-ink-muted);
}

/* ============ 07 按钮与状态 ============ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 44px;
  padding: 0 var(--space-3);
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  letter-spacing: 0.1em;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  transition: background-color 0.18s ease, color 0.18s ease, border-color 0.18s ease;
}
.btn--primary { background: var(--color-primary); color: var(--color-primary-ink); }
.btn--primary:hover { background: color-mix(in srgb, var(--color-primary) 82%, #000); }
.btn--accent { background: var(--color-accent); color: var(--color-accent-ink); }
.btn--accent:hover { background: color-mix(in srgb, var(--color-accent) 82%, #000); }
.btn--outline { border-color: var(--color-ink); color: var(--color-ink); }
.btn--outline:hover { background: var(--color-contrast-surface); border-color: var(--color-contrast-surface); color: var(--color-contrast-ink); }
.btn--ghost { border-color: var(--color-line); color: var(--color-ink-soft); }
.btn--ghost:hover { border-color: var(--color-primary); color: var(--color-primary); }
.btn-row { display: flex; flex-wrap: wrap; gap: var(--space-2); }

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 8px;
  font-family: var(--font-heading);
  font-size: var(--text-xs);
  line-height: 1;
  letter-spacing: 0.1em;
  border-radius: var(--radius-sm);
}
.tag--injury { background: var(--color-primary); color: var(--color-primary-ink); }
.tag--suspend { background: var(--color-primary-soft); color: var(--color-primary); }
.tag--foreign { background: var(--color-accent); color: var(--color-accent-ink); }
.tag--offside { background: var(--color-contrast-surface); color: var(--color-contrast-accent); }
.tag--ok { border: 1px solid var(--color-line); color: var(--color-ink-soft); }
.tag-row { display: flex; flex-wrap: wrap; gap: 6px; }

/* ============ 08 面包屑 ============ */
.breadcrumb { margin: var(--space-3) 0 var(--space-4); }
.breadcrumb__list { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; font-size: var(--text-xs); color: var(--color-ink-muted); }
.breadcrumb__item { display: inline-flex; align-items: center; gap: 8px; }
.breadcrumb__item + .breadcrumb__item::before { content: ""; width: 1px; height: 10px; background: var(--color-line); }
.breadcrumb__link { color: var(--color-ink-soft); border-bottom: 1px solid transparent; }
.breadcrumb__link:hover { color: var(--color-primary); border-bottom-color: var(--color-primary); }
.breadcrumb__current { color: var(--color-ink); }

/* ============ 09 正文栏 ============ */
.prose { max-width: var(--measure); font-size: var(--text-base); line-height: var(--leading-body); color: var(--color-ink); }
.prose > * + * { margin-top: var(--space-3); }
.prose h2 { font-size: var(--text-xl); margin-top: var(--space-6); }
.prose h3 { font-size: var(--text-lg); margin-top: var(--space-4); }
.prose ul, .prose ol { display: grid; gap: var(--space-1); }
.prose ul > li { position: relative; padding-left: 20px; }
.prose ul > li::before { content: ""; position: absolute; left: 0; top: 0.85em; width: 8px; height: 1px; background: var(--color-primary); }
.prose ol { counter-reset: prose; }
.prose ol > li { position: relative; padding-left: 30px; counter-increment: prose; }
.prose ol > li::before {
  content: counter(prose, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 0.3em;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-accent);
}
.prose a { border-bottom: 1px solid var(--color-primary); }
.prose a:hover { color: var(--color-primary); }
.prose blockquote { padding-left: var(--space-3); border-left: 2px solid var(--color-primary); color: var(--color-ink-soft); }

/* ============ 10 步骤轴 ============ */
.steps { display: grid; }
.steps__item {
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr);
  gap: var(--space-3);
  padding: var(--space-4) 0;
  border-top: 1px solid var(--color-line);
}
.steps__item:first-child { border-top: 3px double var(--color-line); }
.steps__num { font-family: var(--font-mono); font-size: var(--text-2xl); line-height: 1; color: var(--color-primary); font-variant-numeric: tabular-nums; }
.steps__title { font-family: var(--font-heading); font-size: var(--text-lg); }
.steps__body { margin-top: var(--space-1); font-size: var(--text-sm); color: var(--color-ink-soft); }
.steps__note { margin-top: var(--space-1); font-size: var(--text-xs); color: var(--color-ink-muted); }

/* ============ 11 条目流 ============ */
.flow { display: grid; }
.flow__item {
  display: grid;
  grid-template-columns: 140px 24px minmax(0, 1fr);
  align-items: start;
  padding: var(--space-4) 0;
  border-bottom: 1px solid var(--color-line);
}
.flow__item:first-child { border-top: 3px double var(--color-line); }
.flow__date { font-family: var(--font-mono); font-size: var(--text-xs); letter-spacing: 0.06em; color: var(--color-ink-muted); }
.flow__rail { position: relative; display: block; width: 1px; margin-left: 11px; align-self: stretch; background: var(--color-line); }
.flow__dot { position: absolute; left: -4px; top: 6px; width: 9px; height: 9px; background: var(--color-primary); border-radius: var(--radius-sm); }
.flow__title { font-family: var(--font-heading); font-size: var(--text-lg); }
.flow__body { margin-top: var(--space-1); font-size: var(--text-sm); color: var(--color-ink-soft); }
.flow__tags { margin-top: var(--space-2); }

/* ============ 12 主题矩阵 ============ */
.matrix { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: var(--gutter); }
.matrix__cell { padding-top: var(--space-2); border-top: 3px double var(--color-line); }
.matrix__label { font-family: var(--font-mono); font-size: var(--text-xs); letter-spacing: 0.18em; color: var(--color-accent); }
.matrix__title { margin-top: var(--space-1); font-family: var(--font-heading); font-size: var(--text-lg); }
.matrix__body { margin-top: var(--space-1); font-size: var(--text-sm); color: var(--color-ink-soft); }

/* ============ 13 编号索引表 ============ */
.catalog { border-top: 3px double var(--color-line); }
.catalog__item {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr) auto;
  align-items: baseline;
  gap: var(--space-1) var(--space-3);
  padding: var(--space-3) 0;
  border-bottom: 1px solid var(--color-line);
}
.catalog__index { font-family: var(--font-mono); font-size: var(--text-sm); color: var(--color-primary); font-variant-numeric: tabular-nums; }
.catalog__title { font-family: var(--font-heading); font-size: var(--text-lg); }
.catalog__desc { grid-column: 2; font-size: var(--text-sm); color: var(--color-ink-soft); }
.catalog__tags { grid-column: 3; grid-row: 1 / span 2; display: flex; flex-wrap: wrap; gap: 6px; justify-content: flex-end; }

/* ============ 14 锚点目录 ============ */
.toc { border-top: 3px double var(--color-line); padding-top: var(--space-2); }
.toc__list { display: grid; }
.toc__link {
  display: grid;
  grid-template-columns: 36px minmax(0, 1fr);
  gap: 8px;
  padding: 8px 0;
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
  border-bottom: 1px solid var(--color-line);
  transition: color 0.16s ease, border-color 0.16s ease;
}
.toc__link:hover { color: var(--color-primary); }
.toc__link[data-current] { color: var(--color-primary); border-bottom-color: var(--color-primary); }
.toc__num { font-family: var(--font-mono); font-size: var(--text-xs); color: inherit; font-variant-numeric: tabular-nums; }

/* ============ 15 折叠面板 ============ */
.panel { border-top: 1px solid var(--color-line); }
.panel:first-of-type { border-top: 3px double var(--color-line); }
.panel__toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  width: 100%;
  min-height: 56px;
  padding: var(--space-2) 0;
  text-align: left;
}
.panel__title { font-family: var(--font-heading); font-size: var(--text-lg); color: var(--color-ink); }
.panel__meta { display: block; margin-top: 4px; font-size: var(--text-xs); color: var(--color-ink-muted); font-variant-numeric: tabular-nums; }
.panel__sign { position: relative; flex: none; width: 12px; height: 12px; border: 1px solid var(--color-primary); }
.panel__sign::before,
.panel__sign::after { content: ""; position: absolute; background: var(--color-primary); }
.panel__sign::before { left: 1px; right: 1px; top: 4px; height: 1px; }
.panel__sign::after { top: 1px; bottom: 1px; left: 4px; width: 1px; transition: transform 0.18s ease; }
.panel[data-open="true"] .panel__sign::after { transform: scaleY(0); }
.panel__body { overflow: hidden; animation: panel-in 0.18s ease both; }
.panel__inner { padding: 0 0 var(--space-3); font-size: var(--text-sm); color: var(--color-ink-soft); }
@keyframes panel-in { from { opacity: 0; } to { opacity: 1; } }

/* ============ 16 数据表 ============ */
.table-scroll {
  overflow-x: auto;
  border-top: 3px double var(--color-line);
  border-bottom: 3px double var(--color-line);
}
.data-table { min-width: 640px; font-size: var(--text-sm); line-height: 1.5; }
.data-table caption {
  padding: var(--space-2) 0;
  text-align: left;
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
}
.data-table th {
  padding: 10px 12px;
  text-align: left;
  white-space: nowrap;
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  letter-spacing: 0.06em;
  background: var(--color-surface-deep);
  border-bottom: 1px solid var(--color-line);
}
.data-table td { padding: 10px 12px; vertical-align: top; border-bottom: 1px solid var(--color-line); }
.data-table tbody tr:nth-child(even) { background: var(--color-surface-alt); }
.data-table .num { font-variant-numeric: tabular-nums lining-nums; text-align: right; }
.data-table th:first-child, .data-table td:first-child { position: sticky; left: 0; z-index: 1; background: var(--color-surface); }
.data-table th:first-child { background: var(--color-surface-deep); }
.data-table tbody tr:nth-child(even) td:first-child { background: var(--color-surface-alt); }
.data-table__note { margin-top: var(--space-1); font-size: var(--text-xs); color: var(--color-ink-muted); }

/* ============ 17 深墨快照带 ============ */
.stat-band {
  padding: var(--space-6) 0;
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-top: 3px double var(--color-contrast-line);
  border-bottom: 3px double var(--color-contrast-line);
}
.stat-band__title { font-family: var(--font-heading); font-size: var(--text-xl); color: var(--color-contrast-ink); }
.stat-band__note { font-size: var(--text-xs); color: color-mix(in srgb, var(--color-contrast-ink) 62%, transparent); }
.stat-band__inner { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: var(--space-4); margin-top: var(--space-4); }
.stat { padding-top: var(--space-2); border-top: 1px solid var(--color-contrast-line); }
.stat__value {
  font-family: var(--font-heading);
  font-size: var(--text-figure);
  line-height: 1.05;
  color: var(--color-contrast-accent);
  font-variant-numeric: tabular-nums lining-nums;
}
.stat__label { margin-top: 6px; font-size: var(--text-sm); color: var(--color-contrast-ink); }
.stat__note { margin-top: 4px; font-size: var(--text-xs); color: color-mix(in srgb, var(--color-contrast-ink) 60%, transparent); }

/* ============ 18 图片容器 ============ */
.figure { display: grid; gap: var(--space-2); margin: 0; }
.figure__media {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  background: var(--color-surface-deep);
  border-radius: var(--radius-lg);
}
.figure__media--tall { aspect-ratio: 3 / 4; }
.figure__media--square { aspect-ratio: 1 / 1; }
.figure__media--round { border-radius: var(--radius-lg); }
.figure__media img { width: 100%; height: 100%; object-fit: cover; border-radius: var(--radius-lg); }
.figure__scrim { position: absolute; inset: 0; background: var(--overlay-scrim); }
.figure__overlay { position: absolute; left: 0; right: 0; bottom: 0; padding: var(--space-3); color: var(--color-contrast-ink); }
.figure__caption { font-size: var(--text-sm); color: var(--color-ink-soft); }
.figure--wide { grid-column: span 12; }

/* ============ 19 筛选条 ============ */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2) var(--space-3);
  padding: var(--space-3) 0;
  border-top: 3px double var(--color-line);
  border-bottom: 1px solid var(--color-line);
}
.filter-set { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; }
.filter-set__label { margin-right: 4px; font-family: var(--font-mono); font-size: var(--text-xs); letter-spacing: 0.16em; color: var(--color-ink-muted); }
.chip {
  min-height: 36px;
  padding: 0 12px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  font-family: var(--font-heading);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: var(--color-ink-soft);
  transition: background-color 0.16s ease, color 0.16s ease, border-color 0.16s ease;
}
.chip:hover { border-color: var(--color-primary); color: var(--color-primary); }
.chip[aria-pressed="true"] { background: var(--color-primary); border-color: var(--color-primary); color: var(--color-primary-ink); }
.filter-count { margin-left: auto; font-size: var(--text-xs); color: var(--color-ink-muted); font-variant-numeric: tabular-nums; }

/* ============ 20 返回顶部与显现 ============ */
.back-to-top {
  position: fixed;
  right: var(--space-3);
  bottom: var(--space-3);
  z-index: 70;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border: 1px solid var(--color-line);
  background: var(--color-surface);
  color: var(--color-primary);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.18s ease, visibility 0.18s ease, background-color 0.18s ease;
}
.back-to-top[data-visible] { opacity: 1; visibility: visible; }
.back-to-top:hover { background: var(--color-contrast-surface); color: var(--color-contrast-ink); border-color: var(--color-contrast-surface); }

.reveal { opacity: 1; transform: none; }
.js .reveal { opacity: 0; transform: translateY(10px); transition: opacity 0.12s ease, transform 0.12s ease; }
.js .reveal.is-visible { opacity: 1; transform: none; }

/* ============ 21 响应式 ============ */
@media (min-width: 960px) and (max-width: 1199px) {
  .sync-note { display: none; }
  .site-nav__link { padding: 8px; }
}
@media (max-width: 959px) {
  .site-header__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: var(--space-2);
  }
  .nav-toggle { display: inline-flex; }
  .site-nav {
    grid-column: 1 / -1;
    grid-row: 2;
    display: none;
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 0;
    padding: var(--space-2) 0 var(--space-3);
    border-top: 3px double var(--color-line);
  }
  .site-nav[data-open] { display: flex; }
  .site-nav__list { flex-direction: column; align-items: stretch; gap: 0; }
  .site-nav__link {
    padding: 14px 8px;
    font-size: var(--text-base);
    border-bottom: 1px solid var(--color-line);
    border-radius: 0;
  }
  .site-nav__link:hover { background: var(--color-surface-alt); }
  .site-nav__aside {
    align-items: flex-start;
    padding: var(--space-3) 0 0;
    gap: 8px;
    border-left: 0;
  }
  .sync-note { max-width: 40ch; text-align: left; }
  .grid--2, .grid--3, .grid--4, .grid--7-5, .grid--5-7, .grid--12 { grid-template-columns: minmax(0, 1fr); }
  .span-3, .span-4, .span-5, .span-6, .span-7, .span-8 { grid-column: auto; }
  .matrix { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .stat-band__inner { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .flow__item { grid-template-columns: 24px minmax(0, 1fr); }
  .flow__date { grid-column: 2; }
  .flow__rail { grid-column: 1; grid-row: 1 / span 2; }
  .flow__title { grid-column: 2; }
  .flow__body { grid-column: 2; }
  .catalog__item { grid-template-columns: 40px minmax(0, 1fr); }
  .catalog__tags { grid-column: 2; grid-row: auto; justify-content: flex-start; }
  .steps__item { grid-template-columns: 52px minmax(0, 1fr); }
  .section { padding-top: var(--space-8); padding-bottom: var(--space-8); }
  .section--lg { padding-top: var(--section-y); padding-bottom: var(--section-y); }
}
@media (min-width: 960px) {
  .site-header[data-condensed] .brand__index,
  .site-header[data-condensed] .sync-note { display: none; }
  .site-header[data-condensed] .site-header__inner { padding-top: 6px; padding-bottom: 6px; }
}
@media (max-width: 639px) {
  .matrix { grid-template-columns: minmax(0, 1fr); }
  .stat-band__inner { grid-template-columns: minmax(0, 1fr); }
  .grid--12, .grid--2, .grid--3, .grid--4 { gap: var(--space-3); }
  .brand { font-size: var(--text-base); }
  .brand__index { letter-spacing: 0.1em; }
  .site-footer__line > * + *::before { margin: 0 6px; }
}

/* ============ 22 动效降级 ============ */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
  .js .reveal { opacity: 1; transform: none; }
  .read-progress__bar { transition: none; }
}