:root {
  --color-surface: #ececea;
  --color-surface-alt: #e4e3e1;
  --color-surface-deep: #d8d7d5;
  --color-ink: #444137;
  --color-ink-soft: #6a6758;
  --color-ink-muted: #858170;
  --color-line: #cecdca;
  --color-primary: #85762e;
  --color-primary-ink: #ffffff;
  --color-primary-soft: #dedbd0;
  --color-accent: #7545ba;
  --color-accent-ink: #ffffff;
  --color-highlight: #d7cee1;
  --color-focus: #7339c6;
  --color-contrast-surface: #262418;
  --color-contrast-ink: #e7e6e4;
  --color-contrast-line: #504f45;
  --color-contrast-accent: #9e7dce;
  --overlay-scrim: linear-gradient(180deg, rgba(38, 36, 24, 0.35) 0%, rgba(38, 36, 24, 0.72) 55%, rgba(38, 36, 24, 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: 13.7px;
  --text-sm: 16.4px;
  --text-base: 18px;
  --text-lg: 21.6px;
  --text-xl: 25.9px;
  --text-2xl: 31.1px;
  --text-3xl: 37.3px;
  --text-4xl: 44.8px;
  --text-display: clamp(36px, 7.3vw, 94px);
  --text-figure: clamp(30px, 5.3vw, 68px);
  --weight-heading: 716;
  --weight-body: 400;
  --leading-body: 1.77;
  --leading-heading: 1.22;
  --tracking-heading: -0.004em;
  --radius-sm: 2px;
  --radius-md: 2px;
  --radius-lg: 3px;
  --radius-pill: 3px;
  --border-thin: 2px;
  --border-thick: 2px;
  --shadow-1: 0 1px 0 rgba(68, 65, 55, 0.12);
  --shadow-2: 0 2px 0 rgba(68, 65, 55, 0.18);
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-6: 48px;
  --space-8: 64px;
  --container: 1220px;
  --measure: 70ch;
  --gutter: 16px;
  --section-y: 80px;
  --section-y-lg: 112px;
}

/* ============ 1. Reset 与基础 ============ */
*, *::before, *::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  --rail: clamp(208px, 16vw, 252px);
  --head-h: 71px;
  --mineral-wash: color-mix(in srgb, var(--color-primary) 13%, var(--color-surface));
  --mineral-mid: color-mix(in srgb, var(--color-primary) 42%, var(--color-surface-deep));
  --mineral-deep: color-mix(in srgb, var(--color-primary) 72%, var(--color-contrast-surface));
  --accent-wash: color-mix(in srgb, var(--color-accent) 15%, var(--color-surface));
  --strata-gradient: linear-gradient(90deg,
    var(--color-contrast-surface) 0 17%,
    var(--color-primary) 17% 40%,
    color-mix(in srgb, var(--color-primary) 48%, var(--color-surface-deep)) 40% 61%,
    var(--color-accent) 61% 81%,
    var(--color-surface-deep) 81% 100%);
  margin: 0;
  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);
  letter-spacing: 0.005em;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4, h5, h6 {
  margin: 0 0 var(--space-2);
  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); }

p { margin: 0 0 var(--space-2); }

a { color: var(--color-primary); text-underline-offset: 3px; }
a:hover { color: var(--color-accent); }

ul, ol { margin: 0 0 var(--space-2); padding-inline-start: 1.2em; }
li { margin-block-end: var(--space-1); }

img, svg, video { max-width: 100%; display: block; }
button { font: inherit; }

hr { border: 0; border-block-start: var(--border-thin) solid var(--color-line); margin-block: var(--space-3); }

::selection { background: var(--color-highlight); color: var(--color-contrast-surface); }

:focus-visible {
  outline: 3px solid var(--color-focus);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0);
  white-space: nowrap; border: 0;
}

/* ============ 2. 头部：移动顶栏 / 桌面档案轨道 ============ */
.skip-link {
  position: fixed;
  inset-block-start: -100px;
  inset-inline-start: var(--space-2);
  z-index: 120;
  padding: var(--space-1) var(--space-2);
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border: var(--border-thick) solid var(--color-contrast-line);
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  font-weight: 700;
  text-decoration: none;
  transition: inset-block-start 0.18s ease;
}
.skip-link:focus { inset-block-start: var(--space-2); color: var(--color-contrast-ink); }

.site-header {
  position: sticky;
  inset-block-start: 0;
  z-index: 60;
  display: flex;
  flex-direction: column;
  width: 100%;
  background: var(--color-surface-alt);
  border-block-end: var(--border-thick) solid var(--color-contrast-surface);
}

.strata-bar {
  width: 100%;
  height: 5px;
  flex: 0 0 auto;
  background: var(--strata-gradient);
}

.rail-head {
  position: relative;
  z-index: 58;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  min-height: 64px;
  padding: var(--space-2) var(--gutter);
  background: var(--color-surface-alt);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  text-decoration: none;
  color: var(--color-ink);
}
.brand:hover { color: var(--color-ink); }

.brand-mark {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  flex: 0 0 auto;
  border-radius: var(--radius-sm);
  background: linear-gradient(180deg,
    var(--color-contrast-surface) 0 25%,
    var(--color-primary) 25% 55%,
    var(--color-accent) 55% 80%,
    var(--color-surface-deep) 80% 100%);
  color: var(--color-contrast-ink);
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: 1;
  text-shadow: 0 1px 0 rgba(38, 36, 24, 0.6);
}

.brand-text { display: flex; flex-direction: column; gap: 1px; }

.brand-name {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: 1.1;
  letter-spacing: var(--tracking-heading);
}

.brand-sub {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  color: var(--color-ink-muted);
}

.nav-toggle {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-2);
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border: var(--border-thick) solid var(--color-contrast-surface);
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  font-weight: 700;
  letter-spacing: 0.06em;
  cursor: pointer;
  box-shadow: var(--shadow-1);
}
.nav-toggle:hover { background: var(--color-contrast-line); border-color: var(--color-contrast-line); }

.nav-toggle-bars {
  display: inline-block;
  width: 16px;
  height: 12px;
  background: repeating-linear-gradient(180deg, currentColor 0 2px, transparent 2px 5px);
}

.site-header[data-open] .nav-toggle {
  background: var(--color-contrast-ink);
  color: var(--color-contrast-surface);
  border-color: var(--color-contrast-ink);
}

.site-nav {
  position: fixed;
  inset-block: 0;
  inset-inline-start: 0;
  z-index: 55;
  width: min(84vw, 330px);
  padding: calc(var(--head-h) + var(--space-3)) var(--space-3) var(--space-4);
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-inline-end: var(--border-thick) solid var(--color-contrast-line);
  overflow-y: auto;
  transform: translateX(-101%);
  visibility: hidden;
  transition: transform 0.3s ease, visibility 0.3s ease;
}
.site-header[data-open] .site-nav {
  transform: translateX(0);
  visibility: visible;
}

.nav-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
}

.nav-item {
  border-block-end: var(--border-thin) solid var(--color-contrast-line);
}
.nav-item:first-child { border-block-start: var(--border-thin) solid var(--color-contrast-line); }

.nav-link {
  display: grid;
  grid-template-columns: 2.4em minmax(0, 1fr);
  align-items: baseline;
  gap: var(--space-1);
  padding: var(--space-2) var(--space-1);
  color: var(--color-contrast-ink);
  text-decoration: none;
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  letter-spacing: var(--tracking-heading);
  transition: background-color 0.16s ease, color 0.16s ease;
}
.nav-link:hover,
.nav-link:focus-visible {
  background: color-mix(in srgb, var(--color-contrast-ink) 14%, transparent);
  color: var(--color-contrast-ink);
}
.nav-link[aria-current="page"] {
  background: var(--color-contrast-ink);
  color: var(--color-contrast-surface);
}

.nav-index {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  opacity: 0.72;
}
.nav-link[aria-current="page"] .nav-index { color: var(--color-contrast-accent); opacity: 1; }

.nav-label { display: block; }

.rail-meta { display: none; }

.scroll-progress {
  position: fixed;
  inset-block-start: 0;
  inset-inline-start: 0;
  z-index: 90;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  transform: scaleX(0);
  transform-origin: left center;
  pointer-events: none;
}

body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 54;
  background: color-mix(in srgb, var(--color-contrast-surface) 68%, transparent);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}
body.nav-open::after { opacity: 1; }

/* ============ 3. 页脚 ============ */
.site-footer {
  margin-block-start: var(--space-8);
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-block-start: var(--border-thick) solid var(--color-contrast-line);
}

.footer-inner {
  max-width: var(--container);
  margin-inline: auto;
  padding: var(--space-2) var(--gutter);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-1) var(--space-3);
  font-size: var(--text-xs);
  line-height: 1.9;
}

.footer-brand {
  margin: 0;
  display: inline-flex;
  align-items: baseline;
  gap: var(--space-1);
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: var(--weight-heading);
  color: var(--color-contrast-ink);
  letter-spacing: var(--tracking-heading);
}

.footer-sub {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 400;
  letter-spacing: 0.1em;
  color: var(--color-contrast-accent);
}

.footer-nav {
  display: inline-flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}
.footer-nav a {
  color: var(--color-contrast-ink);
  text-decoration: none;
  border-block-end: var(--border-thin) solid var(--color-contrast-line);
  padding-block-end: 1px;
  font-weight: 600;
}
.footer-nav a:hover,
.footer-nav a:focus-visible {
  color: var(--color-contrast-surface);
  background: var(--color-contrast-ink);
  border-block-end-color: var(--color-contrast-ink);
}

.footer-meta {
  margin: 0;
  margin-inline-start: auto;
  display: inline-flex;
  flex-wrap: wrap;
  gap: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: color-mix(in srgb, var(--color-contrast-ink) 72%, transparent);
}
.footer-sep { color: var(--color-contrast-line); }

/* ============ 4. 布局容器与地层区块 ============ */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section { padding-block: var(--section-y); }
.section--lg { padding-block: var(--section-y-lg); }

.band {
  background: var(--color-surface-alt);
  border-block: var(--border-thick) solid var(--color-line);
  padding-block: var(--section-y);
}
.band--deep { background: var(--color-surface-deep); }
.band--wash {
  background:
    linear-gradient(180deg, var(--mineral-wash) 0%, color-mix(in srgb, var(--color-primary) 7%, var(--color-surface)) 100%);
  border-color: var(--color-primary-soft);
}
.band--dark {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-color: var(--color-contrast-line);
}
.band--dark h1, .band--dark h2, .band--dark h3, .band--dark h4 { color: var(--color-contrast-ink); }
.band--dark a { color: var(--color-contrast-accent); }

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: var(--space-1) var(--space-3);
  padding-block-start: var(--space-2);
  margin-block-end: var(--space-4);
  border-block-start: var(--border-thick) solid var(--color-ink);
}
.band--dark .section-head, .card--dark .section-head { border-block-start-color: var(--color-contrast-line); }

.section-index {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.18em;
  color: var(--color-ink-muted);
}
.band--dark .section-index { color: var(--color-contrast-accent); }

.section-title {
  margin: 0;
  flex: 1 1 320px;
  font-size: var(--text-2xl);
}

.section-note {
  margin: 0;
  flex: 1 1 240px;
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
}
.band--dark .section-note { color: color-mix(in srgb, var(--color-contrast-ink) 74%, transparent); }

.eyebrow {
  display: block;
  margin: 0 0 var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}

.display-title {
  font-family: var(--font-heading);
  font-size: var(--text-display);
  font-weight: var(--weight-heading);
  line-height: 1.04;
  letter-spacing: -0.02em;
  margin: 0 0 var(--space-3);
}

.lead {
  font-size: var(--text-lg);
  line-height: 1.66;
  color: var(--color-ink-soft);
  max-width: var(--measure);
}

.prose { max-width: var(--measure); }
.prose h2 { margin-block-start: var(--space-6); }
.prose h3 { margin-block-start: var(--space-4); }

.tick-rule {
  --tick: 12px;
  height: 12px;
  margin-block-end: var(--space-2);
  border-block-end: var(--border-thin) solid var(--color-line);
  background-image: repeating-linear-gradient(90deg, var(--color-ink-muted) 0 1.5px, transparent 1.5px var(--tick));
  background-size: 100% 7px;
  background-repeat: repeat-x;
  background-position: left bottom;
}
.band--dark .tick-rule,
.site-footer .tick-rule,
.rail-meta .tick-rule {
  border-block-end-color: var(--color-contrast-line);
  background-image: repeating-linear-gradient(90deg, var(--color-contrast-line) 0 1.5px, transparent 1.5px var(--tick));
}

/* ============ 5. 栅格与拼贴 ============ */
.grid { display: grid; gap: var(--space-3); }
.grid--2 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 320px), 1fr)); }
.grid--3 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 260px), 1fr)); }
.grid--4 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 200px), 1fr)); }

.split { display: grid; gap: var(--space-4); grid-template-columns: minmax(0, 1fr); }
@media (min-width: 900px) {
  .split--7-5 { grid-template-columns: 7fr 5fr; }
  .split--5-7 { grid-template-columns: 5fr 7fr; }
  .split--8-4 { grid-template-columns: 8fr 4fr; }
}

.mosaic {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: var(--space-2);
}
.mosaic > * { grid-column: span 6; }
@media (min-width: 760px) {
  .mosaic > .m-2 { grid-column: span 2; }
  .mosaic > .m-3 { grid-column: span 3; }
  .mosaic > .m-4 { grid-column: span 4; }
  .mosaic > .m-6 { grid-column: span 6; }
}

/* ============ 6. 卡片、指标、标签 ============ */
.card {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding: var(--space-3);
  background: var(--color-surface-alt);
  border: var(--border-thick) solid var(--color-line);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-1);
}
.card--accent {
  background: var(--accent-wash);
  border-color: var(--color-accent);
}
.card--dark {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-color: var(--color-contrast-line);
}
.card--dark a { color: var(--color-contrast-accent); }

.card-num {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  color: var(--color-ink-muted);
}
.card--dark .card-num { color: var(--color-contrast-accent); }

.card-title { margin: 0; font-size: var(--text-xl); }
.card--dark .card-title { color: var(--color-contrast-ink); }

.card-text { margin: 0; font-size: var(--text-sm); color: var(--color-ink-soft); }
.card--dark .card-text { color: color-mix(in srgb, var(--color-contrast-ink) 78%, transparent); }

.card-foot {
  margin-block-start: auto;
  padding-block-start: var(--space-2);
  border-block-start: var(--border-thin) solid var(--color-line);
  font-size: var(--text-xs);
  font-family: var(--font-mono);
  color: var(--color-ink-muted);
}
.card--dark .card-foot { border-block-start-color: var(--color-contrast-line); color: color-mix(in srgb, var(--color-contrast-ink) 66%, transparent); }

.stat {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  padding-block-start: var(--space-2);
  border-block-start: var(--border-thick) solid var(--color-ink);
}
.stat-value {
  font-family: var(--font-mono);
  font-size: var(--text-figure);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
  color: var(--color-ink);
}
.stat-label {
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
}
.stat--accent { border-block-start-color: var(--color-accent); }
.stat--accent .stat-value { color: var(--color-accent); }
.stat--invert { border-block-start-color: var(--color-contrast-line); }
.stat--invert .stat-value { color: var(--color-contrast-ink); }
.stat--invert .stat-label { color: color-mix(in srgb, var(--color-contrast-ink) 72%, transparent); }

.tag {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 1px var(--space-1);
  border: var(--border-thin) solid currentColor;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: var(--color-ink-soft);
  white-space: nowrap;
}
.tag--accent { color: var(--color-accent); }
.tag--primary { color: var(--color-primary); }

.mark-invert {
  display: inline-block;
  padding: 0 6px;
  border-radius: var(--radius-sm);
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}
.band--dark .mark-invert,
.card--dark .mark-invert {
  background: var(--color-contrast-ink);
  color: var(--color-contrast-surface);
}

.note {
  padding: var(--space-2) var(--space-3);
  background: var(--color-surface-deep);
  border-inline-start: var(--border-thick) solid var(--color-primary);
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
}

/* ============ 7. 按钮 ============ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-2) var(--space-3);
  background: transparent;
  color: var(--color-ink);
  border: var(--border-thick) solid var(--color-ink);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-1);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 700;
  letter-spacing: 0.02em;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 0.16s ease, color 0.16s ease, border-color 0.16s ease;
}
.btn:hover, .btn:focus-visible {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-color: var(--color-contrast-surface);
}
.btn--primary {
  background: var(--color-primary);
  color: var(--color-primary-ink);
  border-color: var(--color-primary);
}
.btn--invert {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-color: var(--color-contrast-surface);
}
.btn--invert:hover, .btn--invert:focus-visible {
  background: var(--color-contrast-ink);
  color: var(--color-contrast-surface);
  border-color: var(--color-contrast-ink);
}
.btn--ghost { border-color: var(--color-line); color: var(--color-ink-soft); }

/* ============ 8. 标签页 ============ */
.tabs {
  border: var(--border-thick) solid var(--color-line);
  border-radius: var(--radius-md);
  background: var(--color-surface-alt);
  box-shadow: var(--shadow-1);
  overflow: hidden;
}
.tablist {
  display: flex;
  flex-wrap: wrap;
  border-block-end: var(--border-thick) solid var(--color-line);
}
.tab {
  flex: 1 1 140px;
  padding: var(--space-2) var(--space-3);
  background: transparent;
  border: 0;
  border-inline-end: var(--border-thin) solid var(--color-line);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 700;
  text-align: start;
  color: var(--color-ink-soft);
  cursor: pointer;
  transition: background-color 0.16s ease, color 0.16s ease;
}
.tab:hover { background: var(--color-surface-deep); color: var(--color-ink); }
.tab[aria-selected="true"] {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}
.tabpanel { padding: var(--space-3); }
.tabpanel[hidden] { display: none; }
.tabpanel:focus-visible { outline: 3px solid var(--color-focus); outline-offset: -3px; }

/* ============ 9. 表格 ============ */
.table-wrap {
  overflow-x: auto;
  border: var(--border-thick) solid var(--color-line);
  border-radius: var(--radius-md);
  background: var(--color-surface-alt);
}
.table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--text-sm);
  font-variant-numeric: tabular-nums;
}
.table th, .table td {
  padding: var(--space-2);
  text-align: start;
  border-block-end: var(--border-thin) solid var(--color-line);
}
.table thead th {
  background: var(--color-surface-deep);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-ink-soft);
}
.table tbody tr:nth-child(even) {
  background: color-mix(in srgb, var(--color-surface-deep) 55%, transparent);
}
.table tbody tr:last-child th,
.table tbody tr:last-child td { border-block-end: 0; }
.table td.num { font-family: var(--font-mono); text-align: end; }

/* ============ 10. 图片容器（展签式） ============ */
.figure {
  position: relative;
  margin: 0;
  overflow: hidden;
  border: var(--border-thick) solid var(--color-line);
  border-radius: var(--radius-md);
  background: var(--color-surface-deep);
}
.figure-media {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  background: var(--color-surface-deep);
}
.figure-media > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.figure--portrait .figure-media { aspect-ratio: 3 / 4; }
.figure--square .figure-media { aspect-ratio: 1 / 1; }
.figure--wide .figure-media { aspect-ratio: 21 / 9; }

.figure-media--placeholder {
  background-image:
    linear-gradient(180deg, var(--mineral-wash) 0%, var(--color-surface-deep) 100%),
    repeating-linear-gradient(135deg, transparent 0 12px, color-mix(in srgb, var(--color-line) 70%, transparent) 12px 13px);
  background-blend-mode: multiply;
}

.figure-scrim {
  position: absolute;
  inset: 0;
  background: var(--overlay-scrim);
  pointer-events: none;
}

.figure-tag {
  position: absolute;
  inset-block-start: 0;
  inset-inline-end: 0;
  padding: 3px var(--space-1);
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-inline-start: var(--border-thin) solid var(--color-contrast-ink);
  border-block-end: var(--border-thin) solid var(--color-contrast-ink);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  z-index: 2;
}

.figure-caption {
  position: absolute;
  inset-block-end: 0;
  inset-inline-start: 0;
  z-index: 2;
  max-width: 82%;
  padding: var(--space-2);
  color: var(--color-contrast-ink);
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  text-shadow: 0 1px 0 rgba(38, 36, 24, 0.5);
}

/* ============ 11. 列表、面包屑、键值 ============ */
.list-num {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--space-2);
  counter-reset: ln;
}
.list-num > li {
  display: grid;
  grid-template-columns: 2.6em minmax(0, 1fr);
  gap: var(--space-2);
  align-items: baseline;
  padding-block-start: var(--space-2);
  border-block-start: var(--border-thin) solid var(--color-line);
  margin: 0;
}
.list-num > li::before {
  counter-increment: ln;
  content: counter(ln, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: var(--color-ink-muted);
}
.band--dark .list-num > li { border-block-start-color: var(--color-contrast-line); }
.band--dark .list-num > li::before { color: var(--color-contrast-accent); }

.breadcrumbs {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
  margin-block-end: var(--space-3);
}
.breadcrumbs ol {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
}
.breadcrumbs li { margin: 0; display: inline-flex; gap: var(--space-1); }
.breadcrumbs li:not(:last-child)::after { content: "/"; color: var(--color-line); }
.breadcrumbs a { color: var(--color-ink-soft); text-decoration: none; }
.breadcrumbs a:hover { color: var(--color-accent); text-decoration: underline; }

.meta-row {
  display: grid;
  grid-template-columns: minmax(6em, auto) minmax(0, 1fr);
  gap: var(--space-1) var(--space-2);
  font-size: var(--text-sm);
  padding-block: var(--space-1);
  border-block-end: var(--border-thin) solid var(--color-line);
}
.meta-row dt, .meta-row .meta-key {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: var(--color-ink-muted);
  margin: 0;
}
.meta-row dd, .meta-row .meta-val { margin: 0; }

/* ============ 12. 显现动效 ============ */
.reveal { opacity: 1; }
.js .reveal {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}
.js .reveal.is-visible {
  opacity: 1;
  transform: none;
}

/* ============ 13. 桌面：侧边档案轨道 ============ */
@media (min-width: 1024px) {
  body { padding-inline-start: var(--rail); }

  body::after { display: none; }

  .site-header {
    position: fixed;
    inset-block-start: 0;
    inset-inline-start: 0;
    width: var(--rail);
    height: 100dvh;
    border-block-end: 0;
    border-inline-end: var(--border-thick) solid var(--color-contrast-surface);
    background: var(--color-surface-alt);
  }

  .rail-head {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-2);
    min-height: 0;
    padding: var(--space-3) var(--space-3) var(--space-2);
  }

  .nav-toggle { display: none; }

  .site-nav {
    position: static;
    z-index: auto;
    flex: 1 1 auto;
    width: auto;
    transform: none;
    visibility: visible;
    background: transparent;
    color: inherit;
    border: 0;
    padding: 0 var(--space-3);
    overflow-y: auto;
    transition: none;
  }

  .nav-item { border-block-end: var(--border-thin) solid var(--color-line); }
  .nav-item:first-child { border-block-start: var(--border-thin) solid var(--color-line); }

  .nav-link {
    grid-template-columns: 2.4em minmax(0, 1fr);
    padding: var(--space-2) var(--space-1);
    color: var(--color-ink-soft);
    font-family: var(--font-body);
    font-size: var(--text-sm);
    font-weight: 700;
    letter-spacing: 0.01em;
  }
  .nav-link:hover,
  .nav-link:focus-visible {
    background: var(--color-surface-deep);
    color: var(--color-ink);
  }
  .nav-link[aria-current="page"] {
    background: var(--color-contrast-surface);
    color: var(--color-contrast-ink);
  }
  .nav-link[aria-current="page"] .nav-index { color: var(--color-contrast-accent); }

  .rail-meta {
    display: block;
    padding: var(--space-2) var(--space-3) var(--space-3);
    border-block-start: var(--border-thin) solid var(--color-line);
    font-size: var(--text-xs);
  }
  .rail-meta-item {
    margin: 0 0 4px;
    display: flex;
    flex-direction: column;
    gap: 1px;
    font-size: var(--text-xs);
  }
  .rail-meta-key {
    font-family: var(--font-mono);
    font-size: var(--text-xs);
    letter-spacing: 0.14em;
    color: var(--color-ink-muted);
  }
  .rail-meta a {
    color: var(--color-ink-soft);
    text-decoration: none;
    border-block-end: var(--border-thin) solid var(--color-line);
    align-self: flex-start;
    padding-block-end: 1px;
    word-break: break-all;
  }
  .rail-meta a:hover, .rail-meta a:focus-visible {
    color: var(--color-accent);
    border-block-end-color: var(--color-accent);
  }

  .scroll-progress {
    inset-inline-start: var(--rail);
    width: auto;
    inset-inline-end: 0;
  }
}

/* ============ 14. 可访问性偏好 ============ */
@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; }
  .site-nav { transition: none; }
}