:root {
  --color-surface: #f1f1f0;
  --color-surface-alt: #e9e8e7;
  --color-surface-deep: #dddcda;
  --color-ink: #49423c;
  --color-ink-soft: #72685f;
  --color-ink-muted: #897f76;
  --color-line: #d3d2d0;
  --color-primary: #a26834;
  --color-primary-ink: #ffffff;
  --color-primary-soft: #e6ded6;
  --color-accent: #274ad8;
  --color-accent-ink: #ffffff;
  --color-highlight: #cdd3ec;
  --color-focus: #1b43e4;
  --color-contrast-surface: #2a221a;
  --color-contrast-ink: #e7e5e4;
  --color-contrast-line: #544d46;
  --color-contrast-accent: #6c84e4;
  --overlay-scrim: linear-gradient(180deg, rgba(42, 34, 26, 0.35) 0%, rgba(42, 34, 26, 0.72) 55%, rgba(42, 34, 26, 0.92) 100%);
  --font-heading: "Songti SC", "Source Han Serif SC", "Noto Serif SC", SimSun, serif;
  --font-body: "PingFang SC", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  --font-mono: ui-monospace, Menlo, Consolas, monospace;
  --text-xs: 12.9px;
  --text-sm: 15.5px;
  --text-base: 17px;
  --text-lg: 20.4px;
  --text-xl: 24.5px;
  --text-2xl: 29.4px;
  --text-3xl: 35.3px;
  --text-4xl: 42.3px;
  --text-display: clamp(38px, 7.8vw, 100px);
  --text-figure: clamp(32px, 5.6vw, 72px);
  --weight-heading: 633;
  --weight-body: 400;
  --leading-body: 1.86;
  --leading-heading: 1.21;
  --tracking-heading: 0.001em;
  --radius-sm: 1px;
  --radius-md: 2px;
  --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: 1080px;
  --measure: 61ch;
  --gutter: 24px;
  --section-y: 104px;
  --section-y-lg: 146px;
}

/* ==========================================================================
   1. Reset
   ========================================================================== */
*, *::before, *::after { box-sizing: border-box; }
html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
}
body, h1, h2, h3, h4, h5, h6, p, figure, blockquote, dl, dd { margin: 0; }
ul, ol { margin: 0; padding-left: 1.15em; }
img, svg, video { display: block; max-width: 100%; height: auto; }
button, input, select, textarea { font: inherit; color: inherit; }
a { color: inherit; }
table { border-collapse: collapse; }
summary { cursor: pointer; }

/* ==========================================================================
   2. 纸面与中文排版
   ========================================================================== */
body {
  background-color: 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);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 3;
  pointer-events: none;
  opacity: 0.55;
  background-image: repeating-linear-gradient(
    0deg,
    color-mix(in srgb, var(--color-ink) 4%, transparent) 0,
    color-mix(in srgb, var(--color-ink) 4%, transparent) 1px,
    transparent 1px,
    transparent 3px
  );
}
h1, h2, h3, h4, h5, h6 {
  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-4xl); }
h2 { font-size: var(--text-2xl); }
h3 { font-size: var(--text-xl); }
h4 { font-size: var(--text-lg); }
h5, h6 { font-size: var(--text-base); }
p { text-wrap: pretty; }
[data-section], :target { scroll-margin-top: 96px; }

.mono, .num, code, kbd {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
}
.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  margin: -1px; padding: 0;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}
:focus-visible {
  outline: var(--border-thick) solid var(--color-focus);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* ==========================================================================
   3. 容器 / 区块 / 栅格
   ========================================================================== */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.section { padding-block: clamp(56px, 8vw, var(--section-y)); }
.section--lg { padding-block: clamp(72px, 10vw, var(--section-y-lg)); }
.section + .section { border-top: var(--border-thin) solid var(--color-line); }

.grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--gutter);
}
.col-3 { grid-column: span 3; }
.col-4 { grid-column: span 4; }
.col-5 { grid-column: span 5; }
.col-6 { grid-column: span 6; }
.col-7 { grid-column: span 7; }
.col-8 { grid-column: span 8; }
.col-9 { grid-column: span 9; }
.col-12 { grid-column: span 12; }
.col-main { grid-column: 1 / 9; }
.col-aside { grid-column: 10 / 13; }

.band {
  background: var(--color-surface-alt);
  border-top: var(--border-thin) solid var(--color-line);
  border-bottom: var(--border-thin) dotted var(--color-line);
  padding-block: var(--space-6);
}
.band--primary { background: var(--color-primary-soft); }
.band--dark {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-color: var(--color-contrast-line);
}
.band--dark h2, .band--dark h3 { color: var(--color-contrast-ink); }

.inverse { background: var(--color-contrast-surface); color: var(--color-contrast-ink); }

.prose { max-width: var(--measure); }
.prose p + p { margin-top: 1em; }
.lede {
  max-width: var(--measure);
  font-size: var(--text-lg);
  line-height: 1.7;
  color: var(--color-ink-soft);
}

/* ==========================================================================
   4. 分隔语言 / 印刷标签
   ========================================================================== */
.rule {
  position: relative;
  height: 5px;
  margin: var(--space-6) 0;
  border: 0;
  border-top: var(--border-thin) solid var(--color-line);
  border-bottom: var(--border-thin) solid var(--color-line);
}
.rule--dot {
  height: 0;
  border-top: 1px dotted var(--color-line);
  border-bottom: 0;
}
.rule--tick::before {
  content: "";
  position: absolute;
  left: 0;
  top: -1px;
  width: 8px;
  height: 5px;
  background: var(--color-primary);
}

.label {
  display: inline-block;
  padding: 5px 2px;
  font-family: var(--font-body);
  font-size: var(--text-xs);
  line-height: 1.2;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-ink-soft);
  border-top: var(--border-thin) solid var(--color-line);
  border-bottom: var(--border-thin) solid var(--color-line);
}
.label--solid {
  padding: 5px 10px;
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-primary-ink);
}
.label--accent { color: var(--color-accent); border-color: var(--color-accent); }
.label--dark { color: var(--color-contrast-ink); border-color: var(--color-contrast-line); }
.label--dark.label--solid { background: var(--color-primary); border-color: var(--color-primary); color: var(--color-primary-ink); }

/* ==========================================================================
   5. 链接 / 按钮 / 面包屑
   ========================================================================== */
.link {
  color: var(--color-ink);
  text-decoration: none;
  border-bottom: 1px dotted var(--color-primary);
  transition: border-color 140ms ease-out, color 140ms ease-out;
}
.link:hover { color: var(--color-accent); border-bottom: 1px solid var(--color-accent); }

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: 11px 20px;
  font-size: var(--text-sm);
  letter-spacing: 0.08em;
  text-decoration: none;
  color: var(--color-ink);
  background: transparent;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
  transition: background-color 160ms ease-out, color 160ms ease-out, border-color 160ms ease-out;
}
.btn:hover {
  background: var(--color-contrast-surface);
  border-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}
.btn--solid {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-primary-ink);
}
.btn--solid:hover {
  background: var(--color-contrast-surface);
  border-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}
.btn--accent {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: var(--color-accent-ink);
}
.btn--ghost { border-style: dotted; border-color: var(--color-primary); color: var(--color-primary); }
.btn--ghost:hover { background: var(--color-primary); border-style: solid; color: var(--color-primary-ink); }

.breadcrumb {
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: var(--color-ink-muted);
}
.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
  list-style: none;
  padding-left: 0;
}
.breadcrumb li + li::before { content: "/"; margin-right: var(--space-1); color: var(--color-line); }
.breadcrumb a {
  color: var(--color-ink-soft);
  text-decoration: none;
  border-bottom: 1px dotted var(--color-primary);
}
.breadcrumb a:hover { border-bottom-style: solid; color: var(--color-accent); }

/* ==========================================================================
   6. 页头：左侧轨道导航 + 移动抽屉
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: var(--color-surface-alt);
  border-bottom: var(--border-thin) dotted var(--color-line);
}
.site-header__inner { padding: 0 var(--space-3); }
.brandbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  min-height: 64px;
}
.brand { display: block; text-decoration: none; color: var(--color-ink); }
.brand__name {
  display: block;
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: var(--text-lg);
  line-height: 1.15;
  letter-spacing: 0.02em;
}
.brand__line {
  display: block;
  margin-top: 4px;
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  color: var(--color-ink-muted);
}
.brand__tagline { display: none; }

.nav-toggle {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: 8px 12px;
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  color: var(--color-ink-soft);
  background: transparent;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background-color 140ms ease-out, color 140ms ease-out, border-color 140ms ease-out;
}
.nav-toggle:hover { border-color: var(--color-primary); color: var(--color-primary); }
.nav-toggle__mark {
  width: 16px;
  height: 9px;
  border-top: var(--border-thin) solid currentColor;
  border-bottom: var(--border-thin) solid currentColor;
}
.site-header[data-open="true"] .nav-toggle {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-primary-ink);
}

.rail {
  display: none;
  position: absolute;
  left: 0;
  right: 0;
  top: 100%;
  z-index: 45;
  padding: var(--space-3);
  background: var(--color-surface-alt);
  border-top: var(--border-thin) dotted var(--color-line);
  border-bottom: var(--border-thick) solid var(--color-primary);
  max-height: calc(100vh - 64px);
  overflow-y: auto;
}
.site-header[data-open="true"] .rail { display: block; }

.rail__caption {
  margin-bottom: var(--space-2);
  padding: 6px 0;
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
  border-top: var(--border-thin) solid var(--color-line);
  border-bottom: var(--border-thin) solid var(--color-line);
}
.rail__list {
  counter-reset: navidx;
  list-style: none;
  padding-left: 0;
  border-top: var(--border-thin) solid var(--color-line);
}
.rail__list > li {
  counter-increment: navidx;
  border-bottom: var(--border-thin) solid var(--color-line);
}
.nav-link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 12px 10px;
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  color: var(--color-ink-soft);
  text-decoration: none;
  transition: background-color 140ms ease-out, color 140ms ease-out;
}
.nav-link::before {
  content: counter(navidx, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0;
  color: var(--color-primary);
  transition: color 140ms ease-out;
}
.nav-link:hover,
.nav-link[aria-current="page"] {
  background: var(--color-primary);
  color: var(--color-primary-ink);
}
.nav-link:hover::before,
.nav-link[aria-current="page"]::before { color: var(--color-primary-ink); }

.rail__note {
  margin-top: var(--space-4);
  padding-top: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
  color: var(--color-ink-muted);
  border-top: 1px dotted var(--color-line);
}

.skip-link {
  position: fixed;
  top: -120px;
  left: var(--space-2);
  z-index: 80;
  padding: 10px 16px;
  font-size: var(--text-sm);
  text-decoration: none;
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border: var(--border-thin) solid var(--color-contrast-line);
  border-radius: var(--radius-sm);
  transition: top 140ms ease-out;
}
.skip-link:focus { top: var(--space-2); }

@media (min-width: 1024px) {
  body {
    padding-left: 248px;
    background-image: none;
  }
  .site-header {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: 248px;
    border-bottom: 0;
    border-right: var(--border-thin) dotted var(--color-line);
    overflow-y: auto;
  }
  .site-header__inner {
    display: flex;
    flex-direction: column;
    min-height: 100%;
    padding: var(--space-4) var(--space-3) var(--space-3);
  }
  .brandbar { display: block; min-height: 0; }
  .brand__name { font-size: var(--text-xl); }
  .brand__tagline {
    display: block;
    margin-top: var(--space-2);
    padding-top: var(--space-1);
    font-size: var(--text-xs);
    letter-spacing: 0.08em;
    color: var(--color-ink-muted);
    border-top: 1px dotted var(--color-line);
  }
  .nav-toggle { display: none; }
  .rail {
    display: flex;
    flex-direction: column;
    position: static;
    flex: 1 1 auto;
    margin-top: var(--space-4);
    padding: 0;
    background: transparent;
    border: 0;
    max-height: none;
    overflow: visible;
  }
  .rail__note { margin-top: auto; }
}

/* ==========================================================================
   7. 页脚：大字收尾
   ========================================================================== */
.site-footer {
  margin-top: var(--section-y);
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-top: var(--border-thick) solid var(--color-primary);
}
.site-footer__inner {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding: var(--space-8) var(--gutter) var(--space-4);
}
.site-footer__top { padding-bottom: var(--space-4); }
.site-footer__word {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: calc(var(--text-display) * 1.6);
  line-height: 0.92;
  letter-spacing: 0.02em;
  color: var(--color-contrast-ink);
}
.site-footer__statement {
  max-width: 48ch;
  margin-top: var(--space-3);
  font-size: var(--text-base);
  line-height: 1.75;
  color: var(--color-contrast-ink);
  border-left: var(--border-thick) solid var(--color-primary);
  padding-left: var(--space-2);
}
.site-footer .rule { border-color: var(--color-contrast-line); }
.site-footer__cols {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-4);
  padding-block: var(--space-2);
}
.footer-head {
  margin-bottom: var(--space-2);
  padding: 5px 0;
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 400;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-contrast-accent);
  border-top: var(--border-thin) solid var(--color-contrast-line);
  border-bottom: var(--border-thin) solid var(--color-contrast-line);
}
.footer-list { list-style: none; padding-left: 0; }
.footer-list li {
  padding: 9px 0;
  font-size: var(--text-sm);
  line-height: 1.7;
  color: var(--color-contrast-ink);
  border-bottom: 1px dotted var(--color-contrast-line);
}
.footer-list a {
  color: var(--color-contrast-ink);
  text-decoration: none;
  border-bottom: var(--border-thin) dotted var(--color-contrast-accent);
  transition: color 140ms ease-out, border-color 140ms ease-out;
}
.footer-list a:hover { color: var(--color-contrast-accent); border-bottom-style: solid; }
.footer-key {
  display: inline-block;
  min-width: 68px;
  margin-right: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-contrast-accent);
}
.footer-note {
  margin-top: var(--space-2);
  font-size: var(--text-xs);
  color: var(--color-contrast-line);
}
.site-footer__bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-2) var(--space-4);
  margin-top: var(--space-4);
  padding-top: var(--space-2);
  border-top: var(--border-thin) dotted var(--color-contrast-line);
  font-size: var(--text-xs);
  line-height: 1.7;
}
.footer-legal { display: flex; flex-wrap: wrap; gap: var(--space-3); }
.footer-legal a {
  color: var(--color-contrast-ink);
  text-decoration: none;
  border-bottom: var(--border-thin) dotted var(--color-contrast-accent);
}
.footer-legal a:hover { color: var(--color-contrast-accent); border-bottom-style: solid; }

.copy-btn {
  padding: 3px 8px;
  margin-left: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-contrast-ink);
  background: transparent;
  border: var(--border-thin) dotted var(--color-contrast-line);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background-color 140ms ease-out, color 140ms ease-out, border-color 140ms ease-out;
}
.copy-btn:hover { border-style: solid; border-color: var(--color-contrast-accent); color: var(--color-contrast-accent); }
.copy-btn[data-copied="true"] {
  background: var(--color-primary);
  border-color: var(--color-primary);
  border-style: solid;
  color: var(--color-primary-ink);
}

/* ==========================================================================
   8. 条目 / 旁注 / 统计
   ========================================================================== */
.entry-list { list-style: none; padding-left: 0; border-top: var(--border-thin) solid var(--color-line); }
.entry {
  display: grid;
  grid-template-columns: 88px minmax(0, 1fr);
  gap: var(--space-3);
  padding: var(--space-3) var(--space-2);
  border-bottom: 1px dotted var(--color-line);
  transition: background-color 150ms ease-out;
}
.entry:hover { background: var(--color-surface-alt); }
.entry__index {
  position: relative;
  padding-left: 16px;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
  color: var(--color-primary);
}
.entry__index::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 8px;
  height: 1px;
  background: var(--color-primary);
  transition: width 150ms ease-out, background-color 150ms ease-out;
}
.entry:hover .entry__index::before { width: 16px; background: var(--color-accent); }
.entry__title { margin-bottom: 6px; font-size: var(--text-xl); }
.entry__meta {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}
.entry__body { font-size: var(--text-base); color: var(--color-ink-soft); }

.sidenote {
  padding-left: var(--space-2);
  font-size: var(--text-sm);
  line-height: 1.7;
  color: var(--color-ink-soft);
  border-left: var(--border-thick) solid var(--color-primary);
}
.sidenote__label {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-primary);
}
.sidenote--fill {
  padding: var(--space-2) var(--space-3);
  background: var(--color-primary-soft);
}
.sidenote--quote {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  line-height: 1.5;
  color: var(--color-ink);
}
.sidenote--dark {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-left-color: var(--color-contrast-accent);
}
.sidenote--dark .sidenote__label { color: var(--color-contrast-accent); }

.stat-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: var(--space-3);
}
.stat { padding-top: var(--space-2); border-top: var(--border-thin) solid var(--color-line); }
.stat__value {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--text-figure);
  line-height: 1;
  color: var(--color-accent);
}
.stat__label {
  display: block;
  margin-top: var(--space-1);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  color: var(--color-ink-muted);
}
.stat--ink .stat__value { color: var(--color-ink); }

/* ==========================================================================
   9. 展签式图片容器
   ========================================================================== */
.figure { margin: 0; }
.figure__frame {
  position: relative;
  overflow: hidden;
  background: var(--color-surface-deep);
  border-top: var(--border-thick) solid var(--color-primary);
  border-radius: var(--radius-sm);
}
.figure__frame > img { width: 100%; height: 100%; object-fit: cover; }
.figure__frame--16x9 { aspect-ratio: 16 / 9; }
.figure__frame--4x3 { aspect-ratio: 4 / 3; }
.figure__frame--3x4 { aspect-ratio: 3 / 4; }
.figure__frame--21x9 { aspect-ratio: 21 / 9; }
.figure__scrim { position: absolute; inset: 0; background: var(--overlay-scrim); }
.figure__tag {
  position: absolute;
  left: var(--space-2);
  bottom: var(--space-2);
  padding-bottom: 2px;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: var(--color-contrast-ink);
  border-bottom: var(--border-thin) solid var(--color-contrast-accent);
}
.figure__caption {
  display: flex;
  align-items: baseline;
  gap: var(--space-1);
  margin-top: 10px;
  font-size: var(--text-xs);
  line-height: 1.7;
  color: var(--color-ink-muted);
}
.figure__no { font-family: var(--font-mono); color: var(--color-primary); }

/* ==========================================================================
   10. 对照表
   ========================================================================== */
.table-scroll {
  overflow-x: auto;
  border-top: var(--border-thick) solid var(--color-primary);
  background: var(--color-surface);
}
table.data { width: 100%; font-size: var(--text-sm); }
.data th, .data td {
  padding: 12px 14px;
  text-align: left;
  vertical-align: top;
  white-space: nowrap;
  border-bottom: 1px dotted var(--color-line);
}
.data thead th {
  position: sticky;
  top: 0;
  z-index: 1;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 400;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-ink-soft);
  background: var(--color-surface-alt);
  border-bottom: var(--border-thin) solid var(--color-line);
}
.data tbody tr { transition: background-color 140ms ease-out; }
.data tbody tr:hover { background: var(--color-highlight); }
.data td.num, .data th.num { font-family: var(--font-mono); font-variant-numeric: tabular-nums; }
.data .is-selected { background: var(--color-highlight); }
.data tbody th { font-weight: 400; color: var(--color-ink); }
.data caption {
  padding-bottom: var(--space-1);
  text-align: left;
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  color: var(--color-ink-muted);
}

/* ==========================================================================
   11. 筛选 / 折叠面板 / 目录 / 进度
   ========================================================================== */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-2) 0;
  border-top: var(--border-thin) solid var(--color-line);
  border-bottom: 1px dotted var(--color-line);
}
.filter-item { display: inline-flex; align-items: center; }
.filter-radio {
  position: absolute;
  width: 1px; height: 1px;
  margin: -1px; padding: 0;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}
.filter-chip {
  display: inline-block;
  padding: 6px 12px;
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-ink-soft);
  background: transparent;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background-color 140ms ease-out, color 140ms ease-out, border-color 140ms ease-out;
}
.filter-chip:hover { border-color: var(--color-primary); color: var(--color-primary); }
.filter-radio:checked + .filter-chip {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-primary-ink);
}
.filter-radio:focus-visible + .filter-chip {
  outline: var(--border-thick) solid var(--color-focus);
  outline-offset: 2px;
}
.filter-count { font-family: var(--font-mono); font-size: var(--text-xs); color: var(--color-ink-muted); }
[data-filter-item][hidden] { display: none; }

.panel { border-top: var(--border-thin) solid var(--color-line); }
.panel > summary {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-2);
  padding: 14px 0;
  list-style: none;
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  color: var(--color-ink);
}
.panel > summary::-webkit-details-marker { display: none; }
.panel > summary::after {
  content: "＋";
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-primary);
}
.panel[open] > summary::after { content: "－"; }
.panel__body {
  padding-bottom: var(--space-3);
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
}

.toc { padding-top: var(--space-2); border-top: var(--border-thick) solid var(--color-primary); }
.toc__title {
  margin-bottom: var(--space-2);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}
.toc ol { list-style: none; padding-left: 0; }
.toc li { border-bottom: 1px dotted var(--color-line); }
.toc-link {
  display: block;
  padding: 8px 0 8px 12px;
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
  text-decoration: none;
  border-left: var(--border-thick) solid transparent;
  transition: color 140ms ease-out, border-color 140ms ease-out, background-color 140ms ease-out;
}
.toc-link:hover { color: var(--color-ink); border-left-color: var(--color-primary); }
.toc-link[aria-current="true"] {
  color: var(--color-ink);
  background: var(--color-surface-alt);
  border-left-color: var(--color-accent);
}

.progress {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 60;
  width: 0;
  height: 2px;
  background: var(--color-primary);
}

/* ==========================================================================
   12. 响应式
   ========================================================================== */
@media (min-width: 1024px) {
  .progress { left: 248px; }
}

@media (max-width: 1023px) {
  .site-footer__cols { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .site-footer__word { font-size: calc(var(--text-display) * 1.35); }
}

@media (max-width: 900px) {
  .col-3, .col-4, .col-5, .col-6, .col-7, .col-8, .col-9,
  .col-main, .col-aside { grid-column: 1 / -1; }
  .site-footer__cols { grid-template-columns: minmax(0, 1fr); gap: var(--space-3); }
}

@media (max-width: 600px) {
  .entry { grid-template-columns: minmax(0, 1fr); gap: var(--space-1); }
  .entry__index { padding-left: 14px; }
  .site-footer__bottom { flex-direction: column; align-items: flex-start; }
  .site-footer__word { font-size: calc(var(--text-display) * 1.15); }
  .data th, .data td { padding: 10px 12px; }
}

/* ==========================================================================
   13. 动效与可访问性
   ========================================================================== */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}
@media print {
  .site-header, .progress, .nav-toggle, .copy-btn { display: none; }
  body { padding-left: 0; background: #fff; }
  body::before { display: none; }
}