:root {
  --color-surface: #ffffff;
  --color-surface-alt: #f7f6f6;
  --color-surface-deep: #ebe9eb;
  --color-ink: #574755;
  --color-ink-soft: #7f6b7e;
  --color-ink-muted: #897688;
  --color-line: #e1dee0;
  --color-primary: #a758a0;
  --color-primary-ink: #ffffff;
  --color-primary-soft: #f3e8f2;
  --color-accent: #8b47b8;
  --color-accent-ink: #ffffff;
  --color-highlight: #eadef2;
  --color-focus: #8e3bc4;
  --color-contrast-surface: #171217;
  --color-contrast-ink: #e7e4e7;
  --color-contrast-line: #454045;
  --color-contrast-accent: #a069c4;
  --overlay-scrim: linear-gradient(180deg, rgba(23, 18, 23, 0.35) 0%, rgba(23, 18, 23, 0.72) 55%, rgba(23, 18, 23, 0.92) 100%);
  --font-heading: "Hiragino Sans GB", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Hiragino Sans GB", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, Menlo, Consolas, monospace;
  --text-xs: 12.2px;
  --text-sm: 15.2px;
  --text-base: 17px;
  --text-lg: 21.2px;
  --text-xl: 26.6px;
  --text-2xl: 33.2px;
  --text-3xl: 41.5px;
  --text-4xl: 51.9px;
  --text-display: clamp(35px, 7.2vw, 92px);
  --text-figure: clamp(29px, 5.2vw, 66px);
  --weight-heading: 674;
  --weight-body: 400;
  --leading-body: 1.86;
  --leading-heading: 1.19;
  --tracking-heading: -0.001em;
  --radius-sm: 18px;
  --radius-md: 20px;
  --radius-lg: 21px;
  --radius-pill: 999px;
  --border-thin: 1px;
  --border-thick: 1px;
  --shadow-1: 0 6px 18px rgba(87, 71, 85, 0.08);
  --shadow-2: 0 18px 44px rgba(87, 71, 85, 0.14);
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-6: 48px;
  --space-8: 64px;
  --container: 1160px;
  --measure: 74ch;
  --gutter: 16px;
  --section-y: 84px;
  --section-y-lg: 118px;
}

/* ============ reset & base ============ */
*,
*::before,
*::after { box-sizing: border-box; }

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

@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
}

body {
  --rail-w: 248px;
  --rail-w-min: 76px;
  --topbar-h: 72px;
  --rail-current: var(--rail-w);
  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);
  text-rendering: optimizeLegibility;
}

html[data-rail="collapsed"] body { --rail-current: var(--rail-w-min); }

h1, h2, h3, h4, h5 {
  margin: 0;
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}

p { margin: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }
img, svg, video { display: block; max-width: 100%; }

a { color: var(--color-accent); text-decoration: none; }
a:hover { text-decoration: underline; }

button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
summary { cursor: pointer; }

:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 3px;
  border-radius: 6px;
}

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

.skip-link {
  position: absolute;
  left: var(--space-3);
  top: -120px;
  z-index: 200;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  background: var(--color-primary);
  color: var(--color-primary-ink);
  font-weight: 500;
  transition: top 0.18s ease;
}
.skip-link:focus { top: var(--space-2); text-decoration: none; }

/* ============ 排版工具 ============ */
.mono {
  font-family: var(--font-mono);
  font-weight: 600;
  letter-spacing: -0.01em;
  font-feature-settings: "tnum" 1;
}

.kicker {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-family: var(--font-heading);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}
.kicker::before {
  content: "";
  width: 18px;
  height: var(--border-thin);
  background: var(--color-accent);
}

.type-xl { font-size: var(--text-xl); }
.type-2xl { font-size: var(--text-2xl); }
.type-3xl { font-size: var(--text-3xl); }
.type-display {
  font-family: var(--font-heading);
  font-size: var(--text-display);
  font-weight: 700;
  line-height: 1.02;
  letter-spacing: 0.01em;
}
.figure {
  font-family: var(--font-mono);
  font-size: var(--text-figure);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.02em;
}

.lede { font-size: var(--text-lg); color: var(--color-ink-soft); }
.note { font-size: var(--text-sm); color: var(--color-ink-muted); }

.rule {
  width: 100%;
  height: 0;
  border: 0;
  border-top: var(--border-thin) solid var(--color-line);
  margin: 0;
}
.rule--tight { margin-block: var(--space-3); }

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  background: var(--color-surface-deep);
  color: var(--color-ink-soft);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
}
.tag--accent { background: var(--color-primary-soft); color: var(--color-accent); }

/* ============ 按钮与链接 ============ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-1);
  padding: var(--space-2) var(--space-4);
  border: var(--border-thin) solid transparent;
  border-radius: var(--radius-pill);
  font-family: var(--font-heading);
  font-size: var(--text-base);
  font-weight: 500;
  line-height: 1.2;
  text-decoration: none;
  transition: background 0.18s ease, color 0.18s ease, border-color 0.18s ease, box-shadow 0.18s ease;
}
.btn:hover { text-decoration: none; }
.btn--primary { background: var(--color-primary); color: var(--color-primary-ink); }
.btn--primary:hover { background: color-mix(in srgb, var(--color-primary) 86%, var(--color-contrast-surface)); }
.btn--accent { background: var(--color-accent); color: var(--color-accent-ink); }
.btn--accent:hover { background: color-mix(in srgb, var(--color-accent) 86%, var(--color-contrast-surface)); }
.btn--ghost {
  background: var(--color-surface);
  color: var(--color-ink);
  border-color: var(--color-line);
}
.btn--ghost:hover { border-color: var(--color-accent); color: var(--color-accent); }
.btn--oncontrast {
  background: var(--color-contrast-accent);
  color: var(--color-contrast-surface);
}
.btn--oncontrast:hover { background: color-mix(in srgb, var(--color-contrast-accent) 78%, var(--color-contrast-ink)); }

.link-more {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--color-accent);
  font-weight: 500;
  text-decoration: none;
}
.link-more::after {
  content: "";
  width: 7px;
  height: 7px;
  border-right: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
  transform: rotate(-45deg);
  transition: transform 0.18s ease;
}
.link-more:hover { text-decoration: none; }
.link-more:hover::after { transform: translateX(3px) rotate(-45deg); }

/* ============ 面包屑 ============ */
.breadcrumbs { padding-block: var(--space-2); }
.breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-1);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: var(--color-ink-muted);
}
.breadcrumbs li { display: inline-flex; align-items: center; gap: var(--space-1); }
.breadcrumbs li:not(:last-child)::after { content: "／"; color: var(--color-line); }
.breadcrumbs a { color: var(--color-ink-soft); }

/* ============ 头部：顶栏 ============ */
.site-header { position: relative; z-index: 90; }

.topbar {
  position: sticky;
  top: 0;
  z-index: 90;
  background: color-mix(in srgb, var(--color-surface) 92%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: var(--border-thin) solid var(--color-line);
}

.topbar__inner {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  min-height: var(--topbar-h);
  padding: 0 var(--space-3);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--color-ink);
  text-decoration: none;
}
.brand:hover { text-decoration: none; }
.brand__mark {
  flex: none;
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  border-radius: var(--radius-sm);
  background: var(--color-primary);
  color: var(--color-primary-ink);
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
}
.brand__text { display: flex; flex-direction: column; gap: 2px; }
.brand__name {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: 1.1;
  letter-spacing: 0.02em;
}
.brand__tag {
  font-size: var(--text-xs);
  letter-spacing: 0.2em;
  color: var(--color-ink-muted);
}

.round-chip {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  margin-left: auto;
  padding: 6px var(--space-3);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-pill);
  background: var(--color-primary-soft);
  font-size: var(--text-sm);
  color: var(--color-ink);
}
.round-chip__label {
  font-size: var(--text-xs);
  letter-spacing: 0.2em;
  color: var(--color-ink-muted);
}
.round-chip__value { color: var(--color-ink); }
.round-chip__state { display: inline-flex; align-items: center; color: var(--color-accent); font-size: var(--text-xs); }
.round-chip__state::before {
  content: "";
  width: 6px;
  height: 6px;
  margin-right: 6px;
  border-radius: 50%;
  background: var(--color-accent);
}

.topbar__actions { display: flex; align-items: center; gap: var(--space-2); }

.search-entry {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: 8px var(--space-3);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-pill);
  background: var(--color-surface-alt);
  color: var(--color-ink-soft);
  font-size: var(--text-sm);
  text-decoration: none;
}
.search-entry:hover {
  text-decoration: none;
  border-color: var(--color-accent);
  color: var(--color-accent);
}
.search-entry__icon {
  position: relative;
  width: 12px;
  height: 12px;
  border: 2px solid currentColor;
  border-radius: 50%;
}
.search-entry__icon::after {
  content: "";
  position: absolute;
  right: -5px;
  bottom: -3px;
  width: 7px;
  height: 2px;
  background: currentColor;
  transform: rotate(45deg);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 8px var(--space-3);
  border-radius: var(--radius-pill);
  background: var(--color-primary);
  color: var(--color-primary-ink);
  font-size: var(--text-sm);
}
.nav-toggle__bars { display: inline-flex; flex-direction: column; gap: 3px; }
.nav-toggle__bars span {
  display: block;
  width: 14px;
  height: 2px;
  border-radius: var(--radius-pill);
  background: currentColor;
}

.read-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  overflow: hidden;
}
.read-progress span {
  display: block;
  width: 0;
  height: 100%;
  background: var(--color-accent);
  transition: width 0.1s linear;
}

/* ============ 头部：侧边轨道 ============ */
.rail {
  position: fixed;
  top: var(--topbar-h);
  left: 0;
  bottom: 0;
  z-index: 80;
  width: var(--rail-w);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-3) var(--space-3);
  background: var(--color-surface-alt);
  border-right: var(--border-thin) solid var(--color-line);
  overflow-y: auto;
  transition: width 0.22s ease;
}

.rail__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  padding: 0 var(--space-1);
}
.rail__kicker {
  font-family: var(--font-heading);
  font-size: var(--text-xs);
  letter-spacing: 0.24em;
  color: var(--color-ink-muted);
}
.rail__collapse {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 10px;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-pill);
  background: var(--color-surface);
  color: var(--color-ink-soft);
  font-size: var(--text-xs);
}
.rail__collapse:hover { border-color: var(--color-accent); color: var(--color-accent); }
.rail__collapse-icon {
  width: 8px;
  height: 8px;
  border-left: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
  transform: rotate(45deg);
  transition: transform 0.2s ease;
}
html[data-rail="collapsed"] .rail__collapse-icon { transform: rotate(-135deg); }

.rail__list { display: flex; flex-direction: column; gap: 4px; }

.rail__link {
  position: relative;
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: 10px var(--space-3);
  border-radius: var(--radius-sm);
  color: var(--color-ink-soft);
  font-weight: 500;
  text-decoration: none;
  transition: background 0.18s ease, color 0.18s ease;
}
.rail__link:hover {
  background: var(--color-highlight);
  color: var(--color-ink);
  text-decoration: none;
}
.rail__link[aria-current="page"] {
  background: var(--color-primary-soft);
  color: var(--color-accent);
  font-weight: var(--weight-heading);
}
.rail__link[aria-current="page"]::before {
  content: "";
  position: absolute;
  left: 0;
  top: 14%;
  bottom: 14%;
  width: 3px;
  border-radius: var(--radius-pill);
  background: var(--color-accent);
}
.rail__idx { font-size: var(--text-xs); color: var(--color-ink-muted); }
.rail__link[aria-current="page"] .rail__idx { color: var(--color-accent); }
.rail__label { font-size: var(--text-base); }

.rail__foot {
  margin-top: auto;
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  padding: var(--space-3);
  border-radius: var(--radius-lg);
  background: var(--color-highlight);
}
.rail__foot-title {
  font-size: var(--text-xs);
  letter-spacing: 0.2em;
  color: var(--color-ink-soft);
}
.rail__foot-text { font-size: var(--text-sm); color: var(--color-ink); }
.rail__foot-link { align-self: flex-start; font-size: var(--text-sm); font-weight: 500; }

.rail-scrim {
  position: fixed;
  inset: 0;
  z-index: 75;
  background: color-mix(in srgb, var(--color-contrast-surface) 58%, transparent);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.26s ease, visibility 0.26s ease;
}
.rail[data-open] + .rail-scrim {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

/* ============ 页脚 ============ */
.site-footer {
  margin-left: var(--rail-current);
  margin-top: var(--section-y);
  padding: var(--space-8) 0 var(--space-6);
  background: var(--color-surface-alt);
  border-top: var(--border-thin) solid var(--color-line);
  transition: margin-left 0.22s ease;
}
.footer__inner {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--space-3);
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}
.footer__brand { display: flex; flex-direction: column; gap: var(--space-1); align-items: flex-start; }
.footer__brand-link {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: var(--weight-heading);
  color: var(--color-ink);
  text-decoration: none;
}
.footer__brand-link:hover { color: var(--color-accent); text-decoration: none; }
.footer__brand-line { max-width: 56ch; font-size: var(--text-sm); color: var(--color-ink-soft); }
.footer__meta {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
}

.footer__panels {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--gutter);
}

.panel {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding: var(--space-4) var(--space-3);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-1);
}
.panel--a { background: var(--color-primary-soft); }
.panel--b { background: var(--color-highlight); }
.panel--c { background: var(--color-surface); }
.panel--d { background: var(--color-surface-deep); }
.panel__title { font-size: var(--text-lg); }
.panel__note { font-size: var(--text-sm); color: var(--color-ink-soft); }
.panel__links { display: flex; flex-wrap: wrap; gap: var(--space-1) var(--space-3); }
.panel__links--col { flex-direction: column; gap: var(--space-1); }
.panel__links a { font-size: var(--text-sm); font-weight: 500; }
.panel__facts { display: flex; flex-direction: column; gap: 6px; font-size: var(--text-sm); }
.panel__facts li { display: flex; flex-wrap: wrap; gap: 0 var(--space-1); }
.panel__fact-key { color: var(--color-ink-muted); }
.panel__fact-key::after { content: "："; }

.footer__baseline {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  padding-top: var(--space-3);
  border-top: var(--border-thin) solid var(--color-line);
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
}

/* ============ 深色数据面板 ============ */
.slab {
  position: relative;
  overflow: hidden;
  padding: var(--space-4);
  border-radius: var(--radius-lg);
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  box-shadow: var(--shadow-2);
}
.slab::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 8%;
  min-height: 8px;
  background: repeating-linear-gradient(
    90deg,
    color-mix(in srgb, var(--color-contrast-accent) 45%, transparent) 0 2px,
    transparent 2px 12px
  );
  opacity: 0.5;
  pointer-events: none;
}
.slab::after {
  content: "";
  position: absolute;
  top: -46px;
  right: -46px;
  width: 120px;
  height: 120px;
  background: color-mix(in srgb, var(--color-contrast-accent) 26%, transparent);
  transform: rotate(45deg);
  pointer-events: none;
}
.slab > * { position: relative; z-index: 1; }
.slab--compact { padding: var(--space-2); box-shadow: none; }
.slab h1, .slab h2, .slab h3, .slab h4 { color: var(--color-contrast-ink); }
.slab a { color: var(--color-contrast-accent); }
.slab__label {
  font-family: var(--font-heading);
  font-size: var(--text-xs);
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: color-mix(in srgb, var(--color-contrast-ink) 72%, transparent);
}

.stat { display: flex; flex-direction: column; gap: 4px; }
.stat__value {
  font-family: var(--font-mono);
  font-size: var(--text-2xl);
  font-weight: 600;
  line-height: 1.05;
  letter-spacing: -0.02em;
}
.stat__label {
  font-size: var(--text-xs);
  letter-spacing: 0.18em;
  color: var(--color-ink-muted);
}
.slab .stat__label { color: color-mix(in srgb, var(--color-contrast-ink) 70%, transparent); }
.slab .stat__value { color: var(--color-contrast-ink); }
.slab .stat--hot .stat__value { color: var(--color-contrast-accent); }

/* ============ 轮次切换器 ============ */
.round-switch { display: flex; flex-wrap: wrap; gap: 6px; }
.round-switch__btn {
  padding: 6px var(--space-3);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-pill);
  background: var(--color-surface);
  color: var(--color-ink-soft);
  font-size: var(--text-sm);
  transition: background 0.18s ease, color 0.18s ease, border-color 0.18s ease;
}
.slab .round-switch__btn {
  background: transparent;
  border-color: var(--color-contrast-line);
  color: var(--color-contrast-ink);
}
.slab .round-switch__btn:hover { border-color: var(--color-contrast-accent); }
.slab .round-switch__btn[aria-pressed="true"] {
  background: var(--color-contrast-accent);
  border-color: var(--color-contrast-accent);
  color: var(--color-contrast-surface);
  font-weight: 600;
}
.round-switch__btn[aria-pressed="true"] {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-primary-ink);
}
.round-switch__preview {
  margin-top: var(--space-2);
  font-size: var(--text-sm);
  line-height: 1.6;
  color: var(--color-contrast-ink);
}

/* ============ 通用容器与卡片 ============ */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--space-3);
}

.site-main,
#main-content {
  margin-left: var(--rail-current);
  scroll-margin-top: calc(var(--topbar-h) + var(--space-3));
  transition: margin-left 0.22s ease;
}

.section { padding-block: var(--section-y); }
.section--lg { padding-block: var(--section-y-lg); }
.section--flush-top { padding-top: 0; }
.section--tint { background: var(--color-surface-alt); }
.section--soft { background: var(--color-primary-soft); }
.section--glow { background: var(--color-highlight); }
.section--contrast {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}
.section--contrast h1, .section--contrast h2, .section--contrast h3 { color: var(--color-contrast-ink); }
.section--contrast a { color: var(--color-contrast-accent); }

.grid { display: grid; gap: var(--gutter); }
.grid--12 { grid-template-columns: repeat(12, minmax(0, 1fr)); }
.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-9 { grid-column: span 9; }
.span-12 { grid-column: span 12; }

.card {
  padding: var(--space-3);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  box-shadow: var(--shadow-1);
}
.card--soft { background: var(--color-primary-soft); }
.card--glow { background: var(--color-highlight); }
.card--deep { background: var(--color-surface-deep); }

.prose { max-width: var(--measure); color: var(--color-ink); }
.prose > p + p { margin-top: var(--space-3); }
.prose h2 { margin-top: var(--space-6); font-size: var(--text-2xl); }
.prose h3 { margin-top: var(--space-4); font-size: var(--text-xl); }
.prose ul, .prose ol { margin-top: var(--space-2); display: flex; flex-direction: column; gap: var(--space-1); }
.prose li { padding-left: var(--space-3); position: relative; }
.prose li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 10px;
  height: var(--border-thin);
  background: var(--color-accent);
}

.table { width: 100%; border-collapse: collapse; font-size: var(--text-sm); }
.table caption {
  text-align: left;
  padding-bottom: var(--space-1);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  color: var(--color-ink-muted);
}
.table th, .table td {
  padding: 10px var(--space-2);
  border-bottom: var(--border-thin) solid var(--color-line);
  text-align: left;
}
.table thead th {
  font-family: var(--font-heading);
  font-weight: 500;
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  color: var(--color-ink-soft);
}
.table tbody tr:nth-child(even) { background: var(--color-surface-deep); }
.table .num { font-family: var(--font-mono); font-weight: 600; text-align: right; }

/* ============ 可展开内容组 ============ */
.disclosure {
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  overflow: hidden;
}
.disclosure + .disclosure { margin-top: var(--space-2); }
.disclosure__summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding: var(--space-3);
  list-style: none;
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  color: var(--color-ink);
}
.disclosure__summary::-webkit-details-marker { display: none; }
.disclosure__icon {
  flex: none;
  width: 10px;
  height: 10px;
  border-right: 2px solid var(--color-accent);
  border-bottom: 2px solid var(--color-accent);
  transform: rotate(45deg);
  transition: transform 0.2s ease;
}
.disclosure[open] .disclosure__icon { transform: rotate(-135deg); }
.disclosure__body {
  padding: var(--space-3);
  border-top: var(--border-thin) solid var(--color-line);
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
}

/* ============ 图片容器 ============ */
.media-frame {
  position: relative;
  overflow: hidden;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-lg);
  background: var(--color-surface-deep);
}
.media-frame > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: inherit;
}
.media-frame--16x9 { aspect-ratio: 16 / 9; }
.media-frame--4x3 { aspect-ratio: 4 / 3; }
.media-frame--1x1 { aspect-ratio: 1 / 1; }
.media-frame--tall { aspect-ratio: 3 / 4; }
.media-frame__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: var(--space-4) var(--space-3) var(--space-2);
  background: var(--overlay-scrim);
  color: var(--color-contrast-ink);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  line-height: 1.5;
}

/* ============ 动效 ============ */
html.js [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}
html.js [data-reveal].is-visible { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
  html.js [data-reveal] { opacity: 1; transform: none; }
  .read-progress span { transition: none; }
}

/* ============ 响应式 ============ */
@media (max-width: 1080px) {
  .footer__panels { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .round-chip__label { display: none; }
}

@media (max-width: 1024px) {
  body { --rail-current: 0px; }

  .rail {
    top: 0;
    z-index: 120;
    width: min(320px, 86vw);
    padding-top: var(--space-6);
    transform: translateX(-102%);
    visibility: hidden;
    box-shadow: none;
    transition: transform 0.26s ease, visibility 0.26s ease;
  }
  .rail[data-open] {
    transform: translateX(0);
    visibility: visible;
    box-shadow: var(--shadow-2);
  }
  .rail__collapse { display: none; }
  .nav-toggle { display: inline-flex; }
  .rail-scrim { z-index: 110; }
}

@media (max-width: 900px) {
  .grid--12 > [class*="span-"] { grid-column: span 12; }
}

@media (max-width: 760px) {
  .round-chip { display: none; }
  .footer__panels { grid-template-columns: minmax(0, 1fr); }
  .site-footer { margin-top: var(--section-y); padding-top: var(--space-6); }
  .topbar__inner { gap: var(--space-2); }
  .brand__tag { display: none; }
}

@media (max-width: 560px) {
  .search-entry__text { display: none; }
  .search-entry { padding: 8px 12px; }
  .panel { padding: var(--space-3); }
  .footer__baseline { flex-direction: column; align-items: flex-start; }
}

@media (min-width: 1025px) {
  html[data-rail="collapsed"] .rail {
    padding-left: var(--space-2);
    padding-right: var(--space-2);
  }
  html[data-rail="collapsed"] .rail__kicker,
  html[data-rail="collapsed"] .rail__label,
  html[data-rail="collapsed"] .rail__collapse-text,
  html[data-rail="collapsed"] .rail__foot { display: none; }
  html[data-rail="collapsed"] .rail__head { justify-content: center; padding: 0; }
  html[data-rail="collapsed"] .rail__link { justify-content: center; padding-left: 0; padding-right: 0; }
  html[data-rail="collapsed"] .rail__collapse { padding: 6px; }
  .rail-scrim { display: none; }
}