:root {
  --color-surface: #292629;
  --color-surface-alt: #383438;
  --color-surface-deep: #4a454a;
  --color-ink: #ccc2cc;
  --color-ink-soft: #9f8e9e;
  --color-ink-muted: #897688;
  --color-line: #464246;
  --color-primary: #dd22d5;
  --color-primary-ink: #181118;
  --color-primary-soft: #422541;
  --color-accent: #6ddd22;
  --color-accent-ink: #181118;
  --color-highlight: #354728;
  --color-focus: #6ae916;
  --color-contrast-surface: #efedef;
  --color-contrast-ink: #363035;
  --color-contrast-line: #c6c3c6;
  --color-contrast-accent: #3b7713;
  --overlay-scrim: linear-gradient(180deg, rgba(239, 237, 239, 0.35) 0%, rgba(239, 237, 239, 0.72) 55%, rgba(239, 237, 239, 0.92) 100%);
  --font-heading: "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  --font-body: "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --text-xs: 11.0px;
  --text-sm: 14.7px;
  --text-base: 17px;
  --text-lg: 22.7px;
  --text-xl: 30.2px;
  --text-2xl: 40.3px;
  --text-3xl: 53.7px;
  --text-4xl: 71.5px;
  --text-display: clamp(38px, 7.8vw, 100px);
  --text-figure: clamp(32px, 5.6vw, 72px);
  --weight-heading: 749;
  --weight-body: 400;
  --leading-body: 1.76;
  --leading-heading: 1.15;
  --tracking-heading: -0.001em;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-pill: 999px;
  --border-thin: 1px;
  --border-thick: 1px;
  --shadow-1: 0 0 0 1px rgba(109, 221, 34, 0.35);
  --shadow-2: 0 0 28px rgba(109, 221, 34, 0.35);
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-6: 48px;
  --space-8: 64px;
  --container: 1260px;
  --measure: 72ch;
  --gutter: 24px;
  --section-y: 108px;
  --section-y-lg: 151px;
}

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

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

body {
  margin: 0;
  min-height: 100vh;
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: var(--weight-body);
  line-height: var(--leading-body);
  background-color: var(--color-surface);
  background-image:
    repeating-linear-gradient(180deg, rgba(204, 194, 204, 0.032) 0 1px, rgba(0, 0, 0, 0) 1px 108px),
    radial-gradient(1100px 620px at 6% -8%, rgba(221, 34, 213, 0.11), rgba(0, 0, 0, 0) 68%),
    radial-gradient(900px 540px at 102% 4%, rgba(109, 221, 34, 0.055), rgba(0, 0, 0, 0) 62%);
  background-repeat: no-repeat, no-repeat, no-repeat;
  background-attachment: fixed, fixed, fixed;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

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

h1, h2, h3, h4, h5, h6, p, figure, blockquote, dl, dd { margin: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
table { border-collapse: collapse; width: 100%; }
input, textarea, select { font: inherit; }
summary { cursor: pointer; }

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

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

/* ============ 2. 中文排版 ============ */
h1, h2, h3, h4 {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
  text-wrap: balance;
}

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 { text-wrap: pretty; }

strong { font-weight: var(--weight-heading); color: var(--color-ink); }

/* 展示字号：仅限首屏主标题与跨栏大数字 */
.display-type {
  font-family: var(--font-heading);
  font-size: var(--text-display);
  font-weight: var(--weight-heading);
  line-height: 0.98;
  letter-spacing: -0.02em;
  color: var(--color-ink);
}

.figure-type {
  font-family: var(--font-mono);
  font-size: var(--text-figure);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
  color: var(--color-ink);
}

/* ============ 3. 布局骨架 ============ */
.shell {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

#main-content {
  display: block;
  scroll-margin-top: 140px;
}

.main-offset { padding-top: 168px; }

.section {
  padding-block: var(--section-y);
  border-top: var(--border-thin) solid var(--color-line);
}

.section--lg { padding-block: var(--section-y-lg); }
.section--flush { border-top: 0; padding-top: 0; }

.grid { display: grid; gap: var(--space-3); }
.grid-12 { grid-template-columns: repeat(12, minmax(0, 1fr)); }

.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-12 { grid-column: span 12; }

.prose { max-width: var(--measure); }
.prose p + p { margin-top: var(--space-2); }

/* ============ 4. 章节标题组 ============ */
.section-head {
  display: grid;
  grid-template-columns: minmax(0, 0.32fr) minmax(0, 0.68fr);
  gap: var(--space-4);
  align-items: start;
  margin-bottom: var(--space-6);
}

.section-head__index {
  font-family: var(--font-mono);
  font-size: calc(var(--text-sm) - 1px);
  letter-spacing: 0.1em;
  color: var(--color-primary);
  transition: color 240ms ease, text-shadow 240ms ease;
}

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

.section-head__lead {
  margin-top: var(--space-2);
  color: var(--color-ink-soft);
  max-width: var(--measure);
}

[data-section].is-current .section-head__index {
  color: var(--color-accent);
  text-shadow: 0 0 16px color-mix(in srgb, var(--color-accent) 42%, transparent);
}

/* ============ 5. 标签、强调、提示 ============ */
.tag {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-family: var(--font-mono);
  font-size: calc(var(--text-sm) - 1px);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-ink-soft);
}

.tag--num { color: var(--color-primary); }
.tag--state { color: var(--color-accent); }

.pullquote {
  position: relative;
  margin: var(--space-4) 0;
  padding: var(--space-2) 0 var(--space-2) var(--space-6);
  border-left: 2px solid var(--color-primary);
  max-width: var(--measure);
  font-size: var(--text-lg);
  line-height: 1.56;
  color: var(--color-ink);
}

.pullquote::before {
  content: "“";
  position: absolute;
  left: var(--space-3);
  top: calc(var(--space-2) - 8px);
  font-family: var(--font-mono);
  font-size: var(--text-2xl);
  line-height: 1;
  color: var(--color-primary);
}

.brief {
  margin-top: var(--space-2);
  padding-top: var(--space-2);
  border-top: var(--border-thin) solid var(--color-line);
}

.brief > summary {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  list-style: none;
  font-family: var(--font-mono);
  font-size: calc(var(--text-sm) - 1px);
  letter-spacing: 0.08em;
  color: var(--color-ink-soft);
}

.brief > summary::-webkit-details-marker { display: none; }

.brief > summary::before {
  content: "＋";
  color: var(--color-primary);
  font-weight: 700;
}

.brief[open] > summary::before { content: "－"; }

.brief__body {
  padding-top: var(--space-1);
  max-width: var(--measure);
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
}

.hint {
  display: inline-block;
  min-height: 1.2em;
  font-family: var(--font-mono);
  font-size: calc(var(--text-sm) - 1px);
  letter-spacing: 0.06em;
  color: var(--color-accent);
}

/* ============ 6. 按钮 ============ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-1);
  padding: 11px 20px;
  border-radius: var(--radius-pill);
  border: var(--border-thin) solid var(--color-line);
  background: color-mix(in srgb, var(--color-surface-alt) 88%, transparent);
  color: var(--color-ink);
  font-family: var(--font-heading);
  font-size: var(--text-base);
  font-weight: 600;
  line-height: 1.2;
  white-space: nowrap;
  transition: border-color 260ms ease, box-shadow 260ms ease, transform 260ms ease, background-color 260ms ease, color 260ms ease;
}

.btn:hover {
  border-color: color-mix(in srgb, var(--color-primary) 70%, transparent);
  box-shadow: 0 0 20px color-mix(in srgb, var(--color-primary) 32%, transparent);
  transform: translateY(-2px);
}

.btn:active { transform: translateY(0); }

.btn--primary {
  border-color: color-mix(in srgb, var(--color-primary) 72%, transparent);
  color: var(--color-ink);
  box-shadow: 0 0 0 1px color-mix(in srgb, var(--color-primary) 20%, transparent);
}

.btn--accent {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: var(--color-accent-ink);
  font-weight: 800;
}

.btn--accent:hover {
  box-shadow: var(--shadow-2);
  border-color: var(--color-accent);
}

.btn--ghost {
  background: transparent;
  border-color: var(--color-line);
  color: var(--color-ink-soft);
  font-weight: 500;
}

.btn--ghost:hover { color: var(--color-ink); }

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

/* ============ 7. 卡片与指标 ============ */
.card {
  position: relative;
  padding: var(--space-3);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-lg);
  background: var(--color-surface-alt);
  transition: border-color 280ms ease, box-shadow 280ms ease, transform 280ms ease;
}

.card:hover {
  border-color: color-mix(in srgb, var(--color-primary) 58%, var(--color-line));
  box-shadow: 0 0 26px color-mix(in srgb, var(--color-primary) 22%, transparent);
  transform: translateY(-2px);
}

.card--glass {
  background: color-mix(in srgb, var(--color-surface-alt) 76%, transparent);
  backdrop-filter: blur(10px);
}

.card--edged {
  border-color: color-mix(in srgb, var(--color-primary) 52%, var(--color-line));
  box-shadow: 0 0 0 1px color-mix(in srgb, var(--color-primary) 16%, transparent),
              0 0 24px color-mix(in srgb, var(--color-primary) 16%, transparent);
}

.card--cut {
  border-radius: var(--radius-md);
  clip-path: polygon(0 0, calc(100% - 22px) 0, 100% 22px, 100% 100%, 0 100%);
}

.stat { display: grid; gap: 6px; }

.stat__value {
  font-family: var(--font-mono);
  font-size: var(--text-2xl);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
  color: var(--color-accent);
}

.stat__label {
  font-family: var(--font-mono);
  font-size: calc(var(--text-sm) - 1px);
  letter-spacing: 0.08em;
  color: var(--color-ink-soft);
}

.stat__note { font-size: var(--text-sm); color: var(--color-ink-muted); }

/* ============ 8. 长表格（默认折叠前 5 行） ============ */
.table-wrap {
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  background: var(--color-surface-alt);
  overflow-x: auto;
}

.table { min-width: 620px; font-size: var(--text-base); }

.table caption {
  padding: var(--space-2) var(--space-2) 0;
  text-align: left;
  font-family: var(--font-mono);
  font-size: calc(var(--text-sm) - 1px);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
}

.table th,
.table td {
  padding: 16px var(--space-2);
  text-align: left;
  vertical-align: top;
  border-bottom: var(--border-thin) solid var(--color-line);
}

.table thead th {
  font-family: var(--font-mono);
  font-size: calc(var(--text-sm) - 1px);
  font-weight: 400;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-ink-soft);
  background: var(--color-surface-deep);
}

.table tbody tr:nth-child(even) { background: color-mix(in srgb, var(--color-surface-deep) 48%, transparent); }
.table tbody tr.is-key { background: var(--color-highlight); }
.table tbody tr:last-child td { border-bottom: 0; }
.table td[data-num] { font-family: var(--font-mono); font-weight: 800; font-variant-numeric: tabular-nums; }
.table-wrap[data-collapsed="true"] tbody tr:nth-child(n + 6) { display: none; }

/* ============ 9. 图片容器（供页面阶段放置） ============ */
.media {
  position: relative;
  overflow: hidden;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-lg);
  background: color-mix(in srgb, var(--color-surface-deep) 74%, var(--color-surface));
  aspect-ratio: 16 / 9;
}

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

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

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

.media__caption {
  position: absolute;
  left: var(--space-2);
  right: var(--space-2);
  bottom: var(--space-2);
  z-index: 2;
  font-family: var(--font-mono);
  font-size: calc(var(--text-sm) - 1px);
  letter-spacing: 0.06em;
  line-height: 1.5;
  color: var(--color-ink);
}

/* ============ 10. 面包屑 ============ */
.breadcrumbs {
  font-family: var(--font-mono);
  font-size: calc(var(--text-sm) - 1px);
  letter-spacing: 0.06em;
  color: var(--color-ink-muted);
}

.breadcrumbs ol,
.breadcrumbs ul { display: flex; flex-wrap: wrap; align-items: center; }

.breadcrumbs li { display: inline-flex; align-items: center; }

.breadcrumbs li::after {
  content: "/";
  margin-inline: var(--space-1);
  color: var(--color-line);
}

.breadcrumbs li:last-child::after { content: none; }
.breadcrumbs a { color: var(--color-ink-soft); }
.breadcrumbs a:hover { color: var(--color-accent); }

/* ============ 11. 反色结论带（每页最多一处） ============ */
.band {
  padding: var(--space-6) var(--space-4);
  border-radius: var(--radius-lg);
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}

.band .tag { color: color-mix(in srgb, var(--color-contrast-ink) 68%, transparent); }
.band h2, .band h3 { color: var(--color-contrast-ink); }

.band__figure {
  font-family: var(--font-mono);
  font-weight: 800;
  font-variant-numeric: tabular-nums;
  color: var(--color-contrast-accent);
}

.band__rule {
  margin-block: var(--space-3);
  border-top: var(--border-thin) solid var(--color-contrast-line);
}

/* ============ 12. 头部 ============ */
.skip-link {
  position: fixed;
  top: var(--space-1);
  left: var(--space-1);
  z-index: 120;
  padding: 10px 18px;
  border-radius: var(--radius-pill);
  background: var(--color-accent);
  color: var(--color-accent-ink);
  font-family: var(--font-mono);
  font-size: calc(var(--text-sm) - 1px);
  letter-spacing: 0.08em;
  transform: translateY(-180%);
  transition: transform 240ms ease;
}

.skip-link:focus-visible { transform: translateY(0); }

.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 60;
  padding: 10px var(--gutter) 0;
  pointer-events: none;
}

.site-header > * { pointer-events: auto; }

.progress {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  overflow: hidden;
  background: color-mix(in srgb, var(--color-line) 72%, transparent);
}

.progress__bar {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  transition: width 140ms linear;
}

.header__island {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2) var(--space-3);
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding: 10px 16px 12px 18px;
  border: var(--border-thin) solid color-mix(in srgb, var(--color-primary) 34%, var(--color-line));
  border-radius: var(--radius-lg);
  background: color-mix(in srgb, var(--color-surface-alt) 88%, transparent);
  backdrop-filter: blur(14px);
  box-shadow: 0 0 0 1px color-mix(in srgb, var(--color-primary) 14%, transparent),
              0 0 34px color-mix(in srgb, var(--color-primary) 17%, transparent);
  transition: padding 260ms ease, box-shadow 260ms ease;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  margin-right: auto;
  padding: 2px 4px 2px 0;
}

.brand__mark {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  flex: 0 0 auto;
  border: var(--border-thin) solid color-mix(in srgb, var(--color-primary) 62%, transparent);
  border-radius: var(--radius-md);
  background: var(--color-primary-soft);
  color: var(--color-ink);
  font-family: var(--font-mono);
  font-size: calc(var(--text-sm) - 1px);
  font-weight: 700;
  letter-spacing: 0.04em;
  box-shadow: 0 0 16px color-mix(in srgb, var(--color-primary) 38%, transparent);
}

.brand__text { display: grid; gap: 3px; }

.brand__name {
  font-family: var(--font-heading);
  font-size: var(--text-base);
  font-weight: var(--weight-heading);
  line-height: 1.1;
  letter-spacing: 0.01em;
  color: var(--color-ink);
}

.brand__descriptor {
  font-family: var(--font-mono);
  font-size: calc(var(--text-sm) - 1px);
  line-height: 1.2;
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
  transition: opacity 240ms ease;
}

.nav { flex: 0 1 auto; }

.nav__list {
  display: flex;
  align-items: center;
  gap: 2px;
  padding: 4px;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-pill);
  background: color-mix(in srgb, var(--color-surface) 58%, transparent);
}

.nav__item { display: inline-flex; }

.nav__link {
  display: inline-flex;
  align-items: center;
  padding: 8px 14px;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  font-size: var(--text-sm);
  line-height: 1.3;
  color: var(--color-ink-soft);
  white-space: nowrap;
  transition: color 220ms ease, background-color 220ms ease, border-color 220ms ease, box-shadow 220ms ease;
}

.nav__link:hover {
  color: var(--color-ink);
  background: color-mix(in srgb, var(--color-surface-deep) 68%, transparent);
}

.nav__link[aria-current="page"] {
  color: var(--color-accent);
  border-color: color-mix(in srgb, var(--color-accent) 55%, transparent);
  background: color-mix(in srgb, var(--color-accent) 10%, transparent);
  box-shadow: 0 0 18px color-mix(in srgb, var(--color-accent) 28%, transparent);
}

.header__cta { flex: 0 0 auto; }

.nav-toggle {
  display: none;
  align-items: center;
  gap: var(--space-1);
  padding: 9px 14px;
  border: var(--border-thin) solid color-mix(in srgb, var(--color-primary) 50%, var(--color-line));
  border-radius: var(--radius-pill);
  background: color-mix(in srgb, var(--color-surface) 55%, transparent);
  color: var(--color-ink);
  font-family: var(--font-mono);
  font-size: calc(var(--text-sm) - 1px);
  letter-spacing: 0.08em;
}

.nav-toggle__bars { display: grid; gap: 5px; width: 16px; }

.nav-toggle__bars span {
  display: block;
  height: 1px;
  background: currentColor;
  transition: transform 240ms ease;
}

.site-header[data-open="true"] .nav-toggle__bars span:first-child { transform: translateY(3px) rotate(45deg); }
.site-header[data-open="true"] .nav-toggle__bars span:last-child { transform: translateY(-3px) rotate(-45deg); }

.league-bar {
  flex: 1 1 100%;
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-top: 2px;
  padding-top: 8px;
  border-top: var(--border-thin) solid var(--color-line);
  transition: opacity 240ms ease;
}

.league-bar__caption {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: calc(var(--text-sm) - 1px);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
}

.league-bar__track {
  display: flex;
  align-items: center;
  gap: 6px;
  overflow-x: auto;
  padding-bottom: 2px;
  scrollbar-width: none;
}

.league-bar__track::-webkit-scrollbar { display: none; }

.league-chip {
  flex: 0 0 auto;
  padding: 6px 12px;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-pill);
  background: color-mix(in srgb, var(--color-surface) 55%, transparent);
  color: var(--color-ink-soft);
  font-family: var(--font-mono);
  font-size: calc(var(--text-sm) - 1px);
  letter-spacing: 0.06em;
  white-space: nowrap;
  transition: color 200ms ease, border-color 200ms ease, box-shadow 200ms ease, background-color 200ms ease;
}

.league-chip:hover {
  color: var(--color-ink);
  border-color: color-mix(in srgb, var(--color-primary) 60%, transparent);
}

.league-chip[aria-pressed="true"] {
  color: var(--color-accent);
  border-color: color-mix(in srgb, var(--color-accent) 60%, transparent);
  background: color-mix(in srgb, var(--color-accent) 8%, transparent);
  box-shadow: 0 0 16px color-mix(in srgb, var(--color-accent) 26%, transparent);
}

.site-header.is-scrolled .header__island {
  padding-block: 8px;
  box-shadow: 0 0 0 1px color-mix(in srgb, var(--color-primary) 18%, transparent),
              0 0 24px color-mix(in srgb, var(--color-primary) 14%, transparent);
}

.site-header.is-scrolled .brand__descriptor { display: none; }

.site-header.is-scrolled .league-bar {
  padding-top: 6px;
  border-top-color: color-mix(in srgb, var(--color-line) 60%, transparent);
}

.site-header.is-scrolled .league-chip { padding: 4px 10px; }

/* ============ 13. 页脚 ============ */
.site-footer {
  margin-top: var(--section-y);
  padding-block: var(--space-8) var(--space-4);
  border-top: var(--border-thin) solid var(--color-line);
  background: color-mix(in srgb, var(--color-surface-alt) 52%, var(--color-surface));
}

.footer__grid {
  display: grid;
  grid-template-columns: 1.5fr repeat(3, minmax(0, 1fr));
  gap: var(--space-4);
}

.footer__brand {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  max-width: 36ch;
}

.brand--footer { margin-right: 0; }

.footer__note {
  font-size: var(--text-sm);
  line-height: 1.7;
  color: var(--color-ink-soft);
}

.footer__col { display: block; }

.footer__title {
  margin-bottom: var(--space-2);
  font-family: var(--font-mono);
  font-size: calc(var(--text-sm) - 1px);
  font-weight: 400;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}

.footer__links { display: grid; gap: 10px; }

.footer__links a {
  display: inline-block;
  font-size: var(--text-sm);
  line-height: 1.5;
  color: var(--color-ink);
  border-bottom: 1px solid transparent;
  transition: color 200ms ease, border-color 200ms ease;
}

.footer__links a:hover {
  color: var(--color-accent);
  border-bottom-color: color-mix(in srgb, var(--color-accent) 55%, transparent);
}

.footer__contact {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: var(--space-1) var(--space-3);
  margin-top: var(--space-6);
  padding-top: var(--space-3);
  border-top: var(--border-thin) solid var(--color-line);
  font-family: var(--font-mono);
  font-size: calc(var(--text-sm) - 1px);
  letter-spacing: 0.04em;
  line-height: 1.9;
  color: var(--color-ink-soft);
}

.footer__contact-item { display: inline-flex; align-items: baseline; gap: 6px; }
.footer__contact-item--plain { color: var(--color-ink-muted); }

.footer__copy {
  padding: 0;
  border: 0;
  border-bottom: 1px dashed color-mix(in srgb, var(--color-primary) 55%, transparent);
  background: none;
  font: inherit;
  color: var(--color-ink);
  transition: color 200ms ease, border-color 200ms ease;
}

.footer__copy:hover {
  color: var(--color-accent);
  border-bottom-color: color-mix(in srgb, var(--color-accent) 65%, transparent);
}

.footer__legal {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--space-2);
  margin-top: var(--space-3);
  padding-top: var(--space-3);
  border-top: var(--border-thin) solid var(--color-line);
  font-family: var(--font-mono);
  font-size: calc(var(--text-sm) - 1px);
  letter-spacing: 0.06em;
  color: var(--color-ink-muted);
}

/* ============ 14. 响应式 ============ */
@media (max-width: 1080px) {
  .header__cta { display: none; }
  .footer__grid { grid-template-columns: 1.4fr repeat(3, minmax(0, 1fr)); gap: var(--space-3); }
}

@media (max-width: 980px) {
  .col-4, .col-5, .col-6, .col-7, .col-8 { grid-column: span 12; }
  .grid-12 { gap: var(--space-3); }
  .section-head { grid-template-columns: 1fr; gap: var(--space-2); }
  .section-head__lead { margin-top: var(--space-1); }
}

@media (max-width: 900px) {
  .site-header { padding-top: 8px; }

  .header__island {
    padding: 10px 12px 12px;
    border-radius: var(--radius-lg);
  }

  .brand__descriptor { font-size: calc(var(--text-sm) - 1px); }

  .nav-toggle { display: inline-flex; }

  .nav {
    position: absolute;
    left: 0;
    right: 0;
    top: calc(100% + 8px);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: opacity 240ms ease, transform 240ms ease, visibility 240ms linear;
  }

  .nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    padding: var(--space-2);
    border-radius: var(--radius-lg);
    background: color-mix(in srgb, var(--color-surface-alt) 96%, transparent);
    backdrop-filter: blur(14px);
    box-shadow: 0 18px 44px color-mix(in srgb, var(--color-surface) 78%, transparent);
    max-height: 66vh;
    overflow-y: auto;
  }

  .nav__link {
    justify-content: flex-start;
    padding: 13px 14px;
    border-radius: var(--radius-md);
    font-size: var(--text-base);
  }

  .site-header[data-open="true"] .nav {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }

  .league-bar { border-top-color: color-mix(in srgb, var(--color-line) 70%, transparent); }

  .footer__grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer__brand { grid-column: 1 / -1; max-width: none; }
}

@media (max-width: 640px) {
  :root { --gutter: 16px; }

  .section { padding-block: calc(var(--section-y) * 0.55); }
  .section--lg { padding-block: calc(var(--section-y-lg) * 0.55); }

  .main-offset { padding-top: 148px; }

  .league-bar__caption { display: none; }

  .pullquote { padding-left: var(--space-4); font-size: var(--text-base); }

  .footer__grid { grid-template-columns: 1fr; }
  .footer__contact { flex-direction: column; align-items: flex-start; }
}

/* ============ 15. 减弱动效 ============ */
@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;
  }

  .btn:hover,
  .card:hover { transform: none; }
}