:root {
  --color-surface: #fafafa;
  --color-surface-alt: #f1f1f1;
  --color-surface-deep: #e3e5e4;
  --color-ink: #3e4b3f;
  --color-ink-soft: #607161;
  --color-ink-muted: #768977;
  --color-line: #d8dad8;
  --color-primary: #3d8542;
  --color-primary-ink: #ffffff;
  --color-primary-soft: #e0eae0;
  --color-accent: #587f24;
  --color-accent-ink: #ffffff;
  --color-highlight: #dde4d3;
  --color-focus: #517b19;
  --color-contrast-surface: #151d15;
  --color-contrast-ink: #e4e7e4;
  --color-contrast-line: #434943;
  --color-contrast-accent: #8ac738;
  --overlay-scrim: linear-gradient(180deg, rgba(21, 29, 21, 0.35) 0%, rgba(21, 29, 21, 0.72) 55%, rgba(21, 29, 21, 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: 11.4px;
  --text-sm: 14.3px;
  --text-base: 16px;
  --text-lg: 20.0px;
  --text-xl: 25.0px;
  --text-2xl: 31.2px;
  --text-3xl: 39.1px;
  --text-4xl: 48.8px;
  --text-display: clamp(34px, 6.8vw, 87px);
  --text-figure: clamp(28px, 4.9vw, 63px);
  --weight-heading: 649;
  --weight-body: 400;
  --leading-body: 1.84;
  --leading-heading: 1.17;
  --tracking-heading: -0.008em;
  --radius-sm: 18px;
  --radius-md: 19px;
  --radius-lg: 20px;
  --radius-pill: 999px;
  --border-thin: 1px;
  --border-thick: 1px;
  --shadow-1: 0 6px 18px rgba(62, 75, 63, 0.08);
  --shadow-2: 0 18px 44px rgba(62, 75, 63, 0.14);
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-6: 48px;
  --space-8: 64px;
  --container: 1080px;
  --measure: 66ch;
  --gutter: 24px;
  --section-y: 83px;
  --section-y-lg: 116px;
}

:root {
  --rail-w: 252px;
  --ease-soft: cubic-bezier(0.22, 0.68, 0.32, 1);
}

/* ============ 1. 重置与基础排版 ============ */
*,
*::before,
*::after { box-sizing: border-box; }

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

body {
  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);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body.nav-open { overflow: hidden; }

img,
svg,
video {
  display: block;
  max-width: 100%;
  height: auto;
}

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);
  text-wrap: balance;
}

h1 { font-size: var(--text-4xl); }
h2 { font-size: var(--text-3xl); }
h3 { font-size: var(--text-2xl); }
h4 { font-size: var(--text-lg); }

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

a {
  color: var(--color-accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

a:hover { color: var(--color-primary); }

ul, ol { margin: 0; padding: 0; }

button {
  font: inherit;
  color: inherit;
  cursor: pointer;
}

:focus-visible {
  outline: 3px solid var(--color-focus);
  outline-offset: 3px;
  border-radius: 8px;
}

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

/* 中文排版微调 */
.prose p,
.prose li { line-height: var(--leading-body); }

.mono,
[data-mono] {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.04em;
}

/* ============ 2. 容器与栅格 ============ */
.shell {
  width: 100%;
  max-width: calc(var(--container) + var(--gutter) * 2);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

main { display: block; }

.grid {
  display: grid;
  gap: var(--gutter);
}

.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.grid--split { grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr); }

@media (max-width: 960px) {
  .grid--3,
  .grid--4,
  .grid--split { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 640px) {
  .grid--2,
  .grid--3,
  .grid--4,
  .grid--split { grid-template-columns: minmax(0, 1fr); }
}

/* ============ 3. 分区与色块 ============ */
.section {
  padding-block: var(--section-y);
}

.section--lg { padding-block: var(--section-y-lg); }
.section--alt { background-color: var(--color-surface-alt); }
.section--deep { background-color: var(--color-surface-deep); }
.section--soft { background-color: var(--color-primary-soft); }
.section--highlight { background-color: var(--color-highlight); }

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

.section--contrast h1,
.section--contrast h2,
.section--contrast h3,
.section--contrast h4 { color: var(--color-contrast-ink); }

.section--contrast p { color: color-mix(in srgb, var(--color-contrast-ink) 78%, transparent); }

.slab {
  padding: var(--space-6) var(--space-4);
  border-radius: var(--radius-lg);
  background-color: var(--color-surface-alt);
}

.slab--soft { background-color: var(--color-primary-soft); }
.slab--highlight { background-color: var(--color-highlight); }
.slab--deep { background-color: var(--color-surface-deep); }

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

.slab--contrast h2,
.slab--contrast h3 { color: var(--color-contrast-ink); }

/* ============ 4. 按钮 ============ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-1);
  padding: 12px 22px;
  border: var(--border-thin) solid transparent;
  border-radius: var(--radius-pill);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.01em;
  text-decoration: none;
  white-space: nowrap;
  transition: background-color 0.22s var(--ease-soft),
              color 0.22s var(--ease-soft),
              border-color 0.22s var(--ease-soft),
              transform 0.22s var(--ease-soft),
              box-shadow 0.22s var(--ease-soft);
}

.btn--primary {
  background-color: var(--color-primary);
  color: var(--color-primary-ink);
  box-shadow: var(--shadow-1);
}

.btn--primary:hover {
  background-color: color-mix(in srgb, var(--color-primary) 82%, var(--color-contrast-surface));
  color: var(--color-primary-ink);
  transform: translateY(-2px);
  box-shadow: var(--shadow-2);
}

.btn--accent {
  background-color: var(--color-accent);
  color: var(--color-accent-ink);
}

.btn--accent:hover {
  background-color: color-mix(in srgb, var(--color-accent) 82%, var(--color-contrast-surface));
  color: var(--color-accent-ink);
  transform: translateY(-2px);
}

.btn--soft {
  background-color: var(--color-primary-soft);
  color: var(--color-ink);
}

.btn--soft:hover {
  background-color: var(--color-highlight);
  color: var(--color-ink);
  transform: translateY(-2px);
}

.btn--ghost {
  background-color: transparent;
  border-color: currentColor;
  color: var(--color-ink);
}

.btn--ghost:hover {
  background-color: color-mix(in srgb, var(--color-contrast-ink) 14%, transparent);
  transform: translateY(-2px);
}

.site-footer .btn--ghost {
  color: var(--color-contrast-ink);
  border-color: color-mix(in srgb, var(--color-contrast-ink) 38%, transparent);
}

.site-footer .btn--ghost:hover {
  background-color: color-mix(in srgb, var(--color-contrast-ink) 14%, transparent);
  color: var(--color-contrast-ink);
}

.btn--block { width: 100%; }

/* ============ 5. 头部：跳转链接 ============ */
.skip-link {
  position: fixed;
  left: 50%;
  top: -140px;
  z-index: 200;
  transform: translateX(-50%);
  padding: 12px 22px;
  border-radius: var(--radius-pill);
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  font-size: var(--text-sm);
  font-weight: 600;
  text-decoration: none;
  transition: top 0.22s var(--ease-soft);
}

.skip-link:focus {
  top: 16px;
  color: var(--color-contrast-ink);
}

/* ============ 6. 头部外壳 ============ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 90;
}

/* ============ 7. 桌面端侧边轨道导航 ============ */
.site-rail { display: none; }

.rail-head { display: grid; gap: var(--space-3); }

.rail-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--color-ink);
}

.rail-brand:hover { color: var(--color-ink); }

.rail-mark {
  flex: none;
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  border-radius: 13px;
  background-color: var(--color-primary);
  box-shadow: inset -7px -7px 0 color-mix(in srgb, var(--color-accent) 62%, transparent);
}

.rail-mark__dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background-color: var(--color-primary-ink);
}

.rail-brand__text { display: grid; gap: 2px; }

.rail-brand__name {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}

.rail-brand__tagline {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: var(--color-ink-muted);
}

.rail-hint {
  margin: 0;
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  background-color: var(--color-primary-soft);
  color: var(--color-ink-soft);
  font-size: var(--text-sm);
  line-height: 1.6;
}

.rail-nav { display: block; }

.rail-nav__list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin: 0;
  padding: 0;
}

.rail-nav__link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 11px 14px;
  border-radius: var(--radius-sm);
  color: var(--color-ink-soft);
  font-size: var(--text-sm);
  font-weight: 500;
  text-decoration: none;
  transition: background-color 0.22s var(--ease-soft),
              color 0.22s var(--ease-soft),
              padding-left 0.22s var(--ease-soft);
}

.rail-nav__link::before {
  content: "";
  flex: none;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--color-line);
  transition: background-color 0.22s var(--ease-soft),
              box-shadow 0.22s var(--ease-soft);
}

.rail-nav__link:hover {
  background-color: var(--color-surface);
  color: var(--color-ink);
  padding-left: 18px;
}

.rail-nav__link[aria-current="page"] {
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  font-weight: 600;
}

.rail-nav__link[aria-current="page"]::before {
  background-color: var(--color-contrast-accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--color-contrast-accent) 24%, transparent);
}

.rail-foot {
  margin-top: auto;
  display: grid;
  gap: 12px;
  padding-top: var(--space-3);
}

.rail-meter {
  height: 6px;
  border-radius: var(--radius-pill);
  background-color: var(--color-surface-deep);
  overflow: hidden;
}

.rail-meter__fill {
  display: block;
  width: 0;
  height: 100%;
  border-radius: inherit;
  background-color: var(--color-primary);
  transition: width 0.15s linear;
}

.rail-meter__label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: var(--color-ink-muted);
}

/* ============ 8. 移动端顶栏 ============ */
.site-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  padding: 10px var(--gutter);
  background-color: color-mix(in srgb, var(--color-surface) 88%, transparent);
  backdrop-filter: blur(12px);
  border-bottom: var(--border-thin) solid var(--color-line);
}

.topbar-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--color-ink);
}

.topbar-brand__name {
  font-family: var(--font-heading);
  font-size: var(--text-base);
  font-weight: var(--weight-heading);
  letter-spacing: var(--tracking-heading);
}

.nav-toggle {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 9px 16px;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-pill);
  background-color: var(--color-surface-alt);
  color: var(--color-ink);
  font-size: var(--text-sm);
  font-weight: 600;
}

.nav-toggle:hover { background-color: var(--color-highlight); }

.nav-toggle__bars {
  display: grid;
  gap: 4px;
  width: 16px;
}

.nav-toggle__bars span {
  display: block;
  height: 2px;
  border-radius: 2px;
  background-color: currentColor;
  transition: transform 0.24s var(--ease-soft);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:first-child {
  transform: translateY(3px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:last-child {
  transform: translateY(-3px) rotate(-45deg);
}

/* ============ 9. 移动端抽屉 ============ */
.site-drawer { display: none; }

.site-drawer[data-open="true"] { display: block; }

.site-drawer__scrim {
  position: fixed;
  inset: 0;
  z-index: 110;
  background-color: color-mix(in srgb, var(--color-contrast-surface) 54%, transparent);
  backdrop-filter: blur(3px);
}

.site-drawer__panel {
  position: fixed;
  inset: 0 0 0 auto;
  z-index: 120;
  width: min(340px, 88vw);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  padding: var(--space-4) var(--gutter) var(--space-6);
  background-color: var(--color-surface);
  border-radius: var(--radius-lg) 0 0 var(--radius-lg);
  box-shadow: var(--shadow-2);
  overflow-y: auto;
}

.drawer-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
}

.drawer-head__title {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  color: var(--color-ink-muted);
}

.drawer-close {
  padding: 8px 16px;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-pill);
  background-color: var(--color-surface-alt);
  color: var(--color-ink);
  font-size: var(--text-sm);
  font-weight: 600;
}

.drawer-close:hover { background-color: var(--color-highlight); }

.drawer-note {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
  color: var(--color-ink-muted);
}

/* ============ 10. 页脚 ============ */
.site-footer {
  margin-top: var(--section-y-lg);
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  overflow: hidden;
}

.footer-ruler {
  position: relative;
  height: 32px;
  border-bottom: var(--border-thin) solid var(--color-contrast-line);
}

.footer-ruler::before,
.footer-ruler::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
}

.footer-ruler::before {
  height: 10px;
  background-image: repeating-linear-gradient(90deg, var(--color-contrast-line) 0 1px, transparent 1px 13px);
}

.footer-ruler::after {
  height: 24px;
  background-image: repeating-linear-gradient(90deg, var(--color-contrast-line) 0 1px, transparent 1px 104px);
}

.footer-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.45fr) repeat(3, minmax(0, 1fr));
  gap: var(--space-6) var(--space-4);
  padding-block: var(--space-6);
}

.footer-brand {
  display: grid;
  gap: var(--space-3);
  justify-items: start;
  align-content: start;
}

.footer-brand__name {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: var(--weight-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-contrast-ink);
}

.footer-brand__tagline {
  margin: 0;
  font-size: var(--text-sm);
  color: color-mix(in srgb, var(--color-contrast-ink) 66%, transparent);
}

.footer-col__title {
  margin: 0 0 12px;
  padding-bottom: 10px;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  color: color-mix(in srgb, var(--color-contrast-ink) 56%, transparent);
}

.footer-col__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.footer-col__list li {
  border-top: var(--border-thin) solid var(--color-contrast-line);
}

.footer-col__list a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 12px 0;
  color: color-mix(in srgb, var(--color-contrast-ink) 78%, transparent);
  font-size: var(--text-sm);
  text-decoration: none;
  transition: color 0.2s var(--ease-soft), padding-left 0.2s var(--ease-soft);
}

.footer-col__list a::after {
  content: "→";
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  opacity: 0.45;
}

.footer-col__list a:hover {
  color: var(--color-contrast-accent);
  padding-left: 6px;
}

.footer-contact {
  margin: 0;
  padding-block: var(--space-4);
  border-top: var(--border-thin) solid var(--color-contrast-line);
  font-size: var(--text-sm);
  line-height: 1.8;
  color: color-mix(in srgb, var(--color-contrast-ink) 68%, transparent);
}

.footer-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  padding-bottom: var(--space-4);
  border-top: var(--border-thin) solid var(--color-contrast-line);
  padding-top: var(--space-3);
}

.footer-meta__icp,
.footer-meta__copy {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: color-mix(in srgb, var(--color-contrast-ink) 48%, transparent);
}

.footer-ticker {
  padding-block: 15px;
  border-top: var(--border-thin) solid var(--color-contrast-line);
  overflow: hidden;
}

.footer-ticker__track {
  display: flex;
  align-items: center;
  gap: 34px;
  width: max-content;
  animation: footerTicker 38s linear infinite;
}

.footer-ticker__item {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.1em;
  white-space: nowrap;
  color: color-mix(in srgb, var(--color-contrast-ink) 52%, transparent);
}

.footer-ticker__sep {
  color: var(--color-contrast-accent);
  font-size: var(--text-sm);
  opacity: 0.7;
}

@keyframes footerTicker {
  from { transform: translateX(0); }
  to { transform: translateX(-50%); }
}

@media (max-width: 900px) {
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 560px) {
  .footer-grid { grid-template-columns: minmax(0, 1fr); gap: var(--space-4); }
}

/* ============ 11. 面包屑 ============ */
.breadcrumb {
  margin-bottom: var(--space-3);
}

.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-1);
  list-style: none;
  margin: 0;
  padding: 0;
}

.breadcrumb li {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: var(--color-ink-muted);
}

.breadcrumb li + li::before {
  content: "／";
  color: var(--color-line);
}

.breadcrumb a {
  color: var(--color-ink-muted);
  text-decoration: none;
}

.breadcrumb a:hover { color: var(--color-ink); }

/* ============ 12. 标题组与正文 ============ */
.page-head {
  padding-top: var(--space-8);
  padding-bottom: var(--space-6);
}

.section-head {
  max-width: var(--measure);
  margin-bottom: var(--space-6);
}

.section-head__eyebrow {
  margin: 0 0 var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  color: var(--color-ink-muted);
}

.section-head__title {
  margin: 0 0 var(--space-2);
  font-size: var(--text-3xl);
}

.section-head__desc {
  margin: 0;
  font-size: var(--text-base);
  color: var(--color-ink-soft);
}

.prose {
  max-width: var(--measure);
}

.prose > * + * { 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-lg);
}

.prose ul,
.prose ol {
  padding-left: 1.15em;
}

.prose li + li { margin-top: var(--space-1); }

.prose li::marker { color: var(--color-ink-muted); }

/* ============ 13. 卡片与内容块 ============ */
.card {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding: var(--space-4);
  border-radius: var(--radius-lg);
  background-color: var(--color-surface);
  box-shadow: var(--shadow-1);
  transition: transform 0.24s var(--ease-soft),
              box-shadow 0.24s var(--ease-soft),
              background-color 0.24s var(--ease-soft);
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-2);
  background-color: var(--color-surface-alt);
}

.card--flat {
  box-shadow: none;
  background-color: var(--color-surface-alt);
}

.card--flat:hover {
  background-color: var(--color-highlight);
  box-shadow: var(--shadow-1);
}

.card__title {
  margin: 0;
  font-size: var(--text-lg);
}

.card__text {
  margin: 0;
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
}

.card__tag {
  align-self: flex-start;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  background-color: var(--color-primary-soft);
  color: var(--color-ink);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
}

.card__tag--accent {
  background-color: var(--color-accent);
  color: var(--color-accent-ink);
}

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

/* ============ 14. 数字与反色小块 ============ */
.display {
  font-family: var(--font-heading);
  font-size: var(--text-display);
  line-height: 1.02;
  font-weight: var(--weight-heading);
  letter-spacing: var(--tracking-heading);
  margin: 0;
}

.figure {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-figure);
  line-height: 1;
  font-weight: 600;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
  color: var(--color-ink);
}

.figure__unit {
  display: block;
  margin-top: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  color: var(--color-ink-muted);
}

.section--contrast .figure,
.slab--contrast .figure {
  color: var(--color-contrast-accent);
}

.section--contrast .figure__unit,
.slab--contrast .figure__unit {
  color: color-mix(in srgb, var(--color-contrast-ink) 62%, transparent);
}

.mark {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 9px;
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  font-family: var(--font-mono);
  font-size: 0.92em;
  letter-spacing: 0.04em;
}

.mark--accent {
  background-color: var(--color-accent);
  color: var(--color-accent-ink);
}

/* ============ 15. 图片容器（直角贴合） ============ */
.media {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 4 / 3;
  border-radius: 0;
  overflow: hidden;
  background-color: var(--color-surface-deep);
}

.media > img,
.media > picture > img,
.media > svg,
.media > video {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media--wide { aspect-ratio: 16 / 9; }
.media--tall { aspect-ratio: 3 / 4; }
.media--square { aspect-ratio: 1 / 1; }
.media--strip { aspect-ratio: 21 / 9; }

.media--scrim::after {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--overlay-scrim);
  pointer-events: none;
}

.media__body {
  position: absolute;
  inset: auto 0 0 0;
  z-index: 1;
  padding: var(--space-4);
  color: var(--color-contrast-ink);
}

.media__body h3,
.media__body p { color: var(--color-contrast-ink); }

.media__body p {
  font-size: var(--text-sm);
  color: color-mix(in srgb, var(--color-contrast-ink) 82%, transparent);
}

.media--empty {
  display: grid;
  place-items: center;
  padding: var(--space-4);
  background-image: repeating-linear-gradient(135deg,
    color-mix(in srgb, var(--color-line) 60%, transparent) 0 1px,
    transparent 1px 14px);
  color: var(--color-ink-muted);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  text-align: center;
}

/* ============ 16. 可展开内容组 ============ */
.accordion {
  border-radius: var(--radius-lg);
  background-color: var(--color-surface-alt);
  box-shadow: var(--shadow-1);
  overflow: hidden;
  transition: background-color 0.28s var(--ease-soft);
}

.accordion + .accordion { margin-top: 12px; }

.accordion[data-open="true"] {
  background-color: var(--color-surface-deep);
}

.accordion__head {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding: 20px var(--space-4);
  border: 0;
  background: none;
  text-align: left;
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: 600;
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}

.accordion__icon {
  position: relative;
  flex: none;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background-color: var(--color-contrast-surface);
  transition: transform 0.3s var(--ease-soft);
}

.accordion__icon::before,
.accordion__icon::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  border-radius: 2px;
  background-color: var(--color-contrast-accent);
  transform: translate(-50%, -50%);
}

.accordion__icon::before { width: 11px; height: 2px; }
.accordion__icon::after {
  width: 2px;
  height: 11px;
  transition: transform 0.3s var(--ease-soft), opacity 0.3s var(--ease-soft);
}

.accordion[data-open="true"] .accordion__icon { transform: rotate(180deg); }

.accordion__panel {
  height: 0;
  overflow: hidden;
  transition: height 0.32s var(--ease-soft);
}

.accordion__inner {
  padding: 0 var(--space-4) var(--space-4);
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
}

.accordion__inner > * + * { margin-top: var(--space-2); }

/* ============ 17. 筛选条与清单 ============ */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
  margin-bottom: var(--space-4);
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-pill);
  background-color: var(--color-surface);
  color: var(--color-ink-soft);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 600;
  transition: background-color 0.2s var(--ease-soft),
              color 0.2s var(--ease-soft),
              border-color 0.2s var(--ease-soft);
}

.chip:hover {
  border-color: var(--color-ink-muted);
  color: var(--color-ink);
}

.chip.is-active {
  background-color: var(--color-contrast-surface);
  border-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}

/* ============ 18. 数据矩阵 ============ */
.matrix {
  width: 100%;
  border-collapse: collapse;
  border-radius: var(--radius-lg);
  overflow: hidden;
  font-size: var(--text-sm);
}

.matrix caption {
  caption-side: top;
  text-align: left;
  padding-bottom: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: var(--color-ink-muted);
}

.matrix th,
.matrix td {
  padding: 14px 16px;
  text-align: left;
  border-bottom: var(--border-thin) solid var(--color-line);
  vertical-align: top;
}

.matrix thead th {
  background-color: var(--color-surface-deep);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--color-ink-soft);
}

.matrix tbody tr:hover { background-color: var(--color-surface-alt); }

.matrix tbody td:first-child { font-weight: 600; }

.matrix td[data-num] {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

/* ============ 19. 入场显现 ============ */
.js-ready [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.55s var(--ease-soft), transform 0.55s var(--ease-soft);
}

.js-ready [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

/* ============ 20. 桌面端布局偏移与响应式 ============ */
@media (min-width: 1024px) {
  body { padding-left: var(--rail-w); }

  .site-rail {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
    position: fixed;
    top: 16px;
    bottom: 16px;
    left: 16px;
    width: calc(var(--rail-w) - 32px);
    padding: var(--space-4) var(--space-3);
    border-radius: var(--radius-lg);
    background-color: var(--color-surface-alt);
    box-shadow: var(--shadow-1);
    overflow-y: auto;
    z-index: 100;
  }

  .site-topbar { display: none; }
  .site-drawer { display: none !important; }
}

@media (max-width: 1023px) {
  .site-drawer__panel {
    border-radius: var(--radius-lg) 0 0 var(--radius-lg);
  }
}

@media (max-width: 640px) {
  .section { padding-block: var(--space-6); }
  .section--lg { padding-block: var(--space-8); }
  .page-head { padding-top: var(--space-6); }
  .footer-brand { justify-items: stretch; }
}

/* ============ 21. 无障碍与降级 ============ */
@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;
    scroll-behavior: auto !important;
  }

  .js-ready [data-reveal] {
    opacity: 1;
    transform: none;
  }

  .footer-ticker__track { animation: none; }
}