/* ==========================================================================
   竞博赛事 · 帮助文档  ／  /assets/site.css
   共享层：变量、重置、中文排版、栅格、通用组件、悬浮页头、档案式页脚
   气质：新未来主义 — 深色面板层叠、细发光边界、等宽数字刻度
   ========================================================================== */

:root {
  --color-surface: #2a2a2c;
  --color-surface-alt: #38383b;
  --color-surface-deep: #4a4a4d;
  --color-ink: #cac8d0;
  --color-ink-soft: #9894a3;
  --color-ink-muted: #7c7788;
  --color-line: #47464a;
  --color-primary: #8b6add;
  --color-primary-ink: #131118;
  --color-primary-soft: #383345;
  --color-accent: #9bee11;
  --color-accent-ink: #131118;
  --color-highlight: #3e4d27;
  --color-focus: #9efb04;
  --color-contrast-surface: #efeff0;
  --color-contrast-ink: #323036;
  --color-contrast-line: #c5c5c7;
  --color-contrast-accent: #4d7709;
  --overlay-scrim: linear-gradient(180deg, rgba(239, 239, 240, 0.35) 0%, rgba(239, 239, 240, 0.72) 55%, rgba(239, 239, 240, 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: 9.5px;
  --text-sm: 13.5px;
  --text-base: 16px;
  --text-lg: 22.6px;
  --text-xl: 32.0px;
  --text-2xl: 45.2px;
  --text-3xl: 64.0px;
  --text-4xl: 90.4px;
  --text-display: clamp(51px, 10.4vw, 133px);
  --text-figure: clamp(42px, 7.5vw, 96px);
  --weight-heading: 725;
  --weight-body: 400;
  --leading-body: 1.65;
  --leading-heading: 1.27;
  --tracking-heading: -0.014em;
  --radius-sm: 10px;
  --radius-md: 12px;
  --radius-lg: 13px;
  --radius-pill: 999px;
  --border-thin: 1px;
  --border-thick: 2px;
  --shadow-1: 0 0 0 1px rgba(155, 238, 17, 0.35);
  --shadow-2: 0 0 28px rgba(155, 238, 17, 0.35);
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-6: 48px;
  --space-8: 64px;
  --container: 1200px;
  --measure: 69ch;
  --gutter: 32px;
  --section-y: 89px;
  --section-y-lg: 125px;
}

/* ---------- 1 · Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; }
body {
  margin: 0;
  min-height: 100vh;
  background-color: var(--color-surface);
  background-image:
    radial-gradient(1100px 560px at 84% -12%, color-mix(in srgb, var(--color-primary) 18%, transparent), transparent 66%),
    radial-gradient(720px 420px at 2% 6%, color-mix(in srgb, var(--color-accent) 6%, transparent), transparent 72%);
  background-repeat: no-repeat;
  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;
  -webkit-font-smoothing: antialiased;
}
img, svg, video { display: block; max-width: 100%; }
img { height: auto; }
button, input, select, textarea { font: inherit; color: inherit; }
button { background: none; border: 0; padding: 0; cursor: pointer; }
ul, ol { margin: 0; padding: 0; list-style: none; }
h1, h2, h3, h4, h5, h6, p, figure, blockquote, dl, dd { margin: 0; }
a { color: inherit; text-decoration: none; }
table { border-collapse: collapse; width: 100%; }
:focus-visible { outline: var(--border-thick) solid var(--color-focus); outline-offset: 3px; border-radius: var(--radius-sm); }
::selection { background: var(--color-accent); color: var(--color-accent-ink); }

/* ---------- 2 · 中文排版 ---------- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
  text-wrap: balance;
}
p { text-wrap: pretty; }
strong, b { font-weight: 700; color: var(--color-ink); }
.num, .figure-num, .eyebrow, .tag, .brand-mark, .brand-tag, .breadcrumb-list,
.fold-count, .footer-col-title, .footer-status, .footer-icp, .panel-meta {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}
.num { letter-spacing: -0.01em; }
.display {
  font-size: var(--text-display);
  line-height: 0.94;
  letter-spacing: -0.035em;
  font-weight: var(--weight-heading);
}
.heading-xl { font-size: var(--text-2xl); }
.heading-lg { font-size: var(--text-xl); }
.heading-md { font-size: var(--text-lg); }
.figure-num {
  font-size: var(--text-figure);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--color-ink);
}
.figure-num--accent { color: var(--color-accent); }
.section-lede {
  max-width: var(--measure);
  color: var(--color-ink-soft);
  font-size: var(--text-base);
}

/* ---------- 3 · 布局骨架 ---------- */
.container { width: min(var(--container), 100% - var(--space-6)); margin-inline: auto; }
.section { padding-block: var(--section-y); }
.section--lg { padding-block: var(--section-y-lg); }
.section--tight { padding-block: calc(var(--section-y) / 2); }
.band { background: color-mix(in srgb, var(--color-surface-alt) 92%, transparent); }
.band--deep { background: color-mix(in srgb, var(--color-surface-deep) 82%, transparent); }
.grid-12 { display: grid; grid-template-columns: repeat(12, minmax(0, 1fr)); gap: var(--gutter); }
.col-3 { grid-column: span 3; }
.col-4 { grid-column: span 4; }
.col-5 { grid-column: span 5; }
.col-6 { grid-column: span 6; }
.col-7 { grid-column: span 7; }
.col-8 { grid-column: span 8; }
.col-12 { grid-column: span 12; }
.offset-1 { grid-column-start: 2; }
.shift-1 { margin-left: calc((100% + var(--gutter)) / 12); }
.stack { display: flex; flex-direction: column; gap: var(--space-3); }
.stack--sm { gap: var(--space-2); }
.stack--lg { gap: var(--space-6); }
.cluster { display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-2); }
.visually-hidden {
  position: absolute !important; width: 1px; height: 1px; margin: -1px;
  padding: 0; overflow: hidden; clip: rect(0 0 0 0); clip-path: inset(50%);
  white-space: nowrap; border: 0;
}

/* ---------- 4 · 通用组件 ---------- */
.skip-link {
  position: absolute; left: var(--space-3); top: calc(-1 * var(--space-8)); z-index: 120;
  display: inline-flex; align-items: center; padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md); background: var(--color-accent); color: var(--color-accent-ink);
  font-size: var(--text-sm); font-weight: 700; transition: top 160ms ease;
}
.skip-link:focus { top: var(--space-2); }

.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) 70%, transparent);
  color: var(--color-ink); font-size: var(--text-sm); font-weight: 600; letter-spacing: 0.02em;
  text-align: center;
  transition: background-color 160ms ease, color 160ms ease, border-color 160ms ease, box-shadow 160ms ease;
}
.btn:hover { border-color: color-mix(in srgb, var(--color-primary) 70%, var(--color-line)); box-shadow: var(--shadow-1); }
.btn--primary { background: var(--color-primary); border-color: transparent; color: var(--color-primary-ink); }
.btn--primary:hover { box-shadow: 0 0 24px color-mix(in srgb, var(--color-primary) 55%, transparent); }
.btn--accent { background: var(--color-accent); border-color: transparent; color: var(--color-accent-ink); }
.btn--accent:hover { box-shadow: 0 0 24px color-mix(in srgb, var(--color-accent) 45%, transparent); }
.btn--ghost { background: transparent; color: var(--color-ink-soft); }
.btn--ghost:hover { background: color-mix(in srgb, var(--color-primary) 20%, transparent); color: var(--color-ink); }
.btn--compact { padding: 8px 14px; letter-spacing: 0.04em; }
.btn--block { width: 100%; }

.panel {
  background: color-mix(in srgb, var(--color-surface-alt) 88%, transparent);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  padding: var(--space-4);
  box-shadow: 0 0 0 1px color-mix(in srgb, var(--color-primary) 18%, transparent),
              0 0 26px color-mix(in srgb, var(--color-primary) 12%, transparent);
  transition: border-color 200ms ease, box-shadow 200ms ease, background-color 200ms ease;
}
.panel:hover {
  border-color: color-mix(in srgb, var(--color-primary) 55%, var(--color-line));
  box-shadow: var(--shadow-1), 0 0 32px color-mix(in srgb, var(--color-primary) 20%, transparent);
}
.panel--deep { background: color-mix(in srgb, var(--color-surface-deep) 90%, transparent); }
.panel--contrast {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-color: var(--color-contrast-line);
  box-shadow: none;
}
.panel--contrast .panel-title,
.panel--contrast h2,
.panel--contrast h3 { color: var(--color-contrast-ink); }
.panel--contrast a { color: var(--color-contrast-ink); box-shadow: inset 0 -1px 0 var(--color-contrast-line); }
.panel--contrast .panel-meta,
.panel--contrast a:hover { color: var(--color-contrast-accent); }
.panel-title { font-size: var(--text-lg); }
.panel-meta { font-size: var(--text-sm); color: var(--color-ink-muted); }

.eyebrow {
  display: inline-flex; align-items: center; gap: var(--space-1);
  font-size: var(--text-xs); letter-spacing: 0.24em; color: var(--color-ink-muted);
}
.eyebrow::before {
  content: ""; width: 6px; height: 6px; border-radius: 1px; flex: 0 0 auto;
  background: var(--color-accent); box-shadow: 0 0 10px var(--color-accent);
}

.chip {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 6px 12px; border-radius: var(--radius-pill);
  border: var(--border-thin) solid var(--color-line);
  background: color-mix(in srgb, var(--color-surface-alt) 76%, transparent);
  color: var(--color-ink-soft); font-size: var(--text-sm);
  transition: color 160ms ease, border-color 160ms ease, background-color 160ms ease, box-shadow 160ms ease;
}
.chip:hover { color: var(--color-ink); border-color: color-mix(in srgb, var(--color-primary) 60%, var(--color-line)); box-shadow: var(--shadow-1); }
.chip[aria-pressed="true"], .chip.is-active { background: var(--color-primary); border-color: transparent; color: var(--color-primary-ink); }
.tag {
  display: inline-flex; align-items: center; padding: 3px 9px;
  border-radius: var(--radius-sm); background: var(--color-highlight); color: var(--color-accent);
  font-size: var(--text-sm); letter-spacing: 0.08em;
}

.breadcrumb { padding-top: var(--space-4); }
.breadcrumb-list {
  display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-1);
  font-size: var(--text-sm); color: var(--color-ink-muted);
}
.breadcrumb-item { display: inline-flex; align-items: center; gap: var(--space-1); }
.breadcrumb-item + .breadcrumb-item::before { content: "/"; color: var(--color-line); }
.breadcrumb-link { color: var(--color-ink-soft); transition: color 160ms ease; }
.breadcrumb-link:hover { color: var(--color-accent); }
.breadcrumb-item[aria-current="page"] { color: var(--color-ink); }

.prose { max-width: var(--measure); }
.prose > * + * { margin-top: var(--space-3); }
.prose h2 { font-size: var(--text-xl); margin-top: var(--space-6); }
.prose h3 { font-size: var(--text-lg); margin-top: var(--space-4); }
.prose ul, .prose ol { display: flex; flex-direction: column; gap: var(--space-1); }
.prose li { position: relative; padding-left: var(--space-3); }
.prose li::before {
  content: ""; position: absolute; left: 0; top: 0.75em;
  width: 10px; height: 1px; background: var(--color-primary);
}
.prose code {
  font-family: var(--font-mono); font-size: 0.94em; color: var(--color-accent);
  background: color-mix(in srgb, var(--color-highlight) 70%, transparent);
  padding: 2px 6px; border-radius: 6px;
}
.term { font-family: var(--font-mono); letter-spacing: 0.4em; color: var(--color-ink); }
.term--inline { letter-spacing: 0.02em; color: var(--color-ink-soft); }
.prose a, .link {
  color: var(--color-ink); padding-bottom: 3px;
  background-image: linear-gradient(var(--color-accent), var(--color-accent)),
                    linear-gradient(var(--color-line), var(--color-line));
  background-repeat: no-repeat, no-repeat;
  background-position: 0 100%, 0 100%;
  background-size: 0 1px, 100% 1px;
  transition: background-size 160ms ease, color 160ms ease;
}
.prose a:hover, .link:hover, .prose a:focus-visible, .link:focus-visible {
  color: var(--color-accent); background-size: 100% 1px, 100% 1px;
}

.fold + .fold { margin-top: var(--space-2); }
.fold-head {
  display: flex; align-items: center; gap: var(--space-2); width: 100%;
  padding: var(--space-3) var(--space-4);
  border: var(--border-thin) solid var(--color-line); border-radius: var(--radius-md);
  background: color-mix(in srgb, var(--color-surface-alt) 85%, transparent);
  color: var(--color-ink); font-size: var(--text-base); font-weight: 600; text-align: left;
  transition: border-color 180ms ease, background-color 180ms ease, box-shadow 180ms ease;
}
.fold-head:hover { border-color: color-mix(in srgb, var(--color-primary) 55%, var(--color-line)); box-shadow: var(--shadow-1); }
.fold-head::after {
  content: ""; width: 9px; height: 9px; flex: 0 0 auto; margin-left: var(--space-1);
  border-right: var(--border-thin) solid currentColor; border-bottom: var(--border-thin) solid currentColor;
  transform: rotate(45deg); transition: transform 180ms ease-out;
}
.fold[data-open="true"] .fold-head {
  background: var(--color-primary-soft);
  border-color: color-mix(in srgb, var(--color-primary) 60%, var(--color-line));
}
.fold[data-open="true"] .fold-head::after { transform: rotate(-135deg); }
.fold-label { flex: 1 1 auto; min-width: 0; }
.fold-count {
  flex: 0 0 auto; padding: 2px 9px; border-radius: var(--radius-pill);
  font-size: var(--text-sm); color: var(--color-accent);
  background: color-mix(in srgb, var(--color-accent) 14%, transparent);
}
.fold-body {
  padding: var(--space-3) var(--space-4) var(--space-4);
  border: var(--border-thin) solid var(--color-line); border-top: 0;
  border-radius: 0 0 var(--radius-md) var(--radius-md);
  background: color-mix(in srgb, var(--color-surface) 60%, transparent);
}
.fold-body[hidden] { display: none; }

.data-table { width: 100%; font-size: var(--text-sm); }
.data-table th, .data-table td {
  padding: var(--space-2) var(--space-3); text-align: left; vertical-align: top;
  border-bottom: var(--border-thin) solid var(--color-line);
}
.data-table thead th {
  font-family: var(--font-mono); letter-spacing: 0.08em; color: var(--color-ink-soft);
  border-bottom-color: color-mix(in srgb, var(--color-primary) 45%, var(--color-line));
  background: color-mix(in srgb, var(--color-surface-alt) 70%, transparent);
}
.data-table tbody tr:hover, .data-table tr.is-active { background: var(--color-primary-soft); }

.media-frame {
  position: relative; display: block; overflow: hidden;
  border-radius: 0; background: var(--color-surface-alt); aspect-ratio: 16 / 9;
}
.media-frame > img, .media-frame > picture > img { width: 100%; height: 100%; object-fit: cover; border-radius: 0; }
.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--tall { aspect-ratio: 4 / 5; }
.media-frame--square { aspect-ratio: 1 / 1; }
.media-frame--placeholder {
  display: grid; place-items: center;
  border: var(--border-thin) dashed var(--color-line);
  color: var(--color-ink-muted); font-family: var(--font-mono); font-size: var(--text-sm);
}
.overlay-scrim { position: absolute; inset: 0; background: var(--overlay-scrim); pointer-events: none; }
.media-caption { margin-top: var(--space-2); font-size: var(--text-sm); color: var(--color-ink-muted); }

/* ---------- 5 · 悬浮胶囊页头 ---------- */
.site-header {
  position: sticky; top: 0; z-index: 90;
  padding: var(--space-3) 0 var(--space-2);
  background: linear-gradient(180deg,
    color-mix(in srgb, var(--color-surface) 96%, transparent) 0%,
    color-mix(in srgb, var(--color-surface) 78%, transparent) 62%,
    transparent 100%);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: background 200ms ease;
}
.site-header[data-scrolled="true"] {
  background: linear-gradient(180deg,
    color-mix(in srgb, var(--color-surface) 99%, transparent) 0%,
    color-mix(in srgb, var(--color-surface) 90%, transparent) 72%,
    transparent 100%);
}
.header-shell {
  position: relative;
  width: min(var(--container), 100% - var(--space-6));
  margin-inline: auto;
  display: flex; align-items: center; gap: var(--space-2);
}
.header-island {
  background: color-mix(in srgb, var(--color-surface-deep) 86%, transparent);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-pill);
  box-shadow: 0 0 0 1px color-mix(in srgb, var(--color-primary) 16%, transparent);
  transition: box-shadow 200ms ease, border-color 200ms ease, background-color 200ms ease;
}
.header-island:hover {
  border-color: color-mix(in srgb, var(--color-primary) 45%, var(--color-line));
  box-shadow: var(--shadow-1), 0 0 26px color-mix(in srgb, var(--color-primary) 22%, transparent);
}
.header-island:focus-within {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 1px var(--color-primary), 0 0 26px color-mix(in srgb, var(--color-primary) 30%, transparent);
}
.site-header[data-scrolled="true"] .header-island {
  background: color-mix(in srgb, var(--color-surface-deep) 96%, transparent);
  box-shadow: var(--shadow-1);
}
.header-brand { flex: 0 0 auto; padding: 6px 14px 6px 8px; }
.header-actions { flex: 0 0 auto; display: flex; align-items: center; gap: var(--space-1); padding: 6px; }
.header-cta { white-space: nowrap; }

.brand { display: inline-flex; align-items: center; gap: var(--space-2); min-width: 0; }
.brand-mark {
  display: inline-flex; align-items: center; justify-content: center; flex: 0 0 auto;
  padding: 6px 8px; border-radius: var(--radius-sm);
  background: var(--color-accent); color: var(--color-accent-ink);
  font-size: var(--text-xs); font-weight: 700; letter-spacing: 0.14em;
}
.brand-text { display: flex; flex-direction: column; gap: 2px; min-width: 0; }
.brand-name {
  font-family: var(--font-heading); font-size: var(--text-sm); font-weight: 700;
  letter-spacing: -0.01em; color: var(--color-ink); white-space: nowrap;
}
.brand-tag { font-size: var(--text-xs); letter-spacing: 0.1em; color: var(--color-ink-muted); white-space: nowrap; }

.header-nav {
  flex: 1 1 auto; min-width: 0;
  display: flex; justify-content: center; padding: 6px;
}
.nav-list { display: flex; align-items: center; gap: 2px; overflow-x: auto; scrollbar-width: none; }
.nav-list::-webkit-scrollbar { display: none; }
.nav-item { display: flex; }
.nav-link {
  display: block; padding: 8px 14px; border-radius: var(--radius-pill);
  font-size: var(--text-sm); color: var(--color-ink-soft); white-space: nowrap;
  transition: color 160ms ease, background-color 160ms ease, box-shadow 160ms ease;
}
.nav-link:hover {
  color: var(--color-ink);
  background: color-mix(in srgb, var(--color-primary) 24%, transparent);
}
.nav-link[aria-current="page"] {
  background: var(--color-primary); color: var(--color-primary-ink); font-weight: 600;
  box-shadow: 0 0 18px color-mix(in srgb, var(--color-primary) 45%, transparent);
}

.nav-toggle {
  display: none; align-items: center; gap: var(--space-1);
  padding: 8px 14px; border-radius: var(--radius-pill);
  border: var(--border-thin) solid var(--color-line);
  color: var(--color-ink); font-size: var(--text-sm); font-weight: 600;
  transition: border-color 160ms ease, background-color 160ms ease, color 160ms ease, box-shadow 160ms ease;
}
.nav-toggle:hover { border-color: var(--color-primary); box-shadow: var(--shadow-1); }
.nav-toggle[aria-expanded="true"] { background: var(--color-primary); color: var(--color-primary-ink); border-color: transparent; }
.nav-toggle-bars { display: flex; flex-direction: column; gap: 3px; width: 14px; }
.nav-toggle-bars span { display: block; height: 1.5px; background: currentColor; border-radius: 2px; transition: transform 160ms ease; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:first-child { transform: translateY(4.5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:last-child { transform: translateY(-4.5px) rotate(-45deg); }
.nav-toggle-label { letter-spacing: 0.06em; }

.scroll-progress {
  position: fixed; inset: 0 0 auto 0; height: 2px; z-index: 100; pointer-events: none;
  background: color-mix(in srgb, var(--color-line) 70%, transparent);
}
.scroll-progress-bar {
  display: block; height: 100%; width: 0;
  background: linear-gradient(90deg, var(--color-primary), var(--color-focus));
  box-shadow: 0 0 12px color-mix(in srgb, var(--color-accent) 60%, transparent);
}

@keyframes navRise {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: none; }
}

/* ---------- 6 · 档案式页脚 ---------- */
.site-footer { padding: 0 var(--space-3) var(--space-6); background: transparent; }
.footer-shell {
  width: min(var(--container), 100%); margin-inline: auto;
  background: color-mix(in srgb, var(--color-surface-alt) 94%, transparent);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: 0 0 0 1px color-mix(in srgb, var(--color-primary) 16%, transparent),
              0 0 44px color-mix(in srgb, var(--color-primary) 12%, transparent);
}
.footer-top { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 2fr); gap: var(--space-8); }
.footer-brand { display: flex; flex-direction: column; gap: var(--space-3); max-width: 40ch; }
.footer-brand-link { width: fit-content; }
.footer-note { font-size: var(--text-sm); color: var(--color-ink-soft); }
.footer-status {
  display: inline-flex; align-items: center; gap: var(--space-1);
  font-size: var(--text-xs); letter-spacing: 0.14em; color: var(--color-ink-muted);
}
.status-dot {
  width: 6px; height: 6px; border-radius: 50%; flex: 0 0 auto;
  background: var(--color-accent); box-shadow: 0 0 10px var(--color-accent);
}
.footer-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: var(--space-4); }
.footer-col { display: flex; flex-direction: column; gap: var(--space-2); }
.footer-col-title { font-size: var(--text-sm); font-weight: 600; letter-spacing: 0.14em; color: var(--color-ink); }
.footer-list { display: flex; flex-direction: column; gap: var(--space-1); }
.footer-link, .legal-link {
  display: inline-block; padding-bottom: 2px; font-size: var(--text-sm); color: var(--color-ink-soft);
  background-image: linear-gradient(var(--color-accent), var(--color-accent));
  background-repeat: no-repeat; background-position: 0 100%; background-size: 0 1px;
  transition: background-size 160ms ease, color 160ms ease;
}
.footer-link:hover, .legal-link:hover, .footer-link:focus-visible, .legal-link:focus-visible {
  color: var(--color-accent); background-size: 100% 1px;
}
.footer-legal {
  margin-top: var(--space-8);
  display: flex; flex-direction: column; gap: var(--space-2);
  color: var(--color-ink-muted); font-size: var(--text-sm);
}
.footer-legal-text { max-width: var(--measure); color: var(--color-ink-soft); }
.legal-links { display: flex; flex-wrap: wrap; gap: var(--space-3); }
.footer-contact { color: var(--color-ink-soft); }
.footer-meta { display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-1) var(--space-4); }
.footer-icp { letter-spacing: 0.04em; }

/* ---------- 7 · 响应式 ---------- */
@media (max-width: 1180px) {
  .nav-link { padding: 8px 11px; }
  .brand-tag { display: none; }
}
@media (max-width: 1060px) {
  .site-header { padding-top: var(--space-2); }
  .header-shell { flex-wrap: wrap; gap: var(--space-1); }
  .header-brand { flex: 1 1 auto; order: 1; }
  .header-actions { order: 2; }
  .header-nav {
    order: 3; flex: 1 0 100%; display: none;
    justify-content: flex-start; padding: var(--space-2);
    border-radius: var(--radius-lg);
  }
  .site-header[data-open="true"] .header-nav,
  .header-nav[data-open="true"] { display: block; animation: navRise 180ms ease-out; }
  .nav-list { flex-direction: column; align-items: stretch; gap: 2px; overflow: visible; }
  .nav-link { padding: 12px 14px; border-radius: var(--radius-sm); font-size: var(--text-base); }
  .nav-toggle { display: inline-flex; }
  .grid-12 { grid-template-columns: repeat(6, minmax(0, 1fr)); gap: var(--space-3); }
  .col-3, .col-4 { grid-column: span 3; }
  .col-5, .col-7, .col-8 { grid-column: span 6; }
  .offset-1 { grid-column-start: auto; }
  .shift-1 { margin-left: 0; }
}
@media (max-width: 1000px) {
  .footer-top { grid-template-columns: minmax(0, 1fr); gap: var(--space-6); }
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 600px) {
  .container { width: min(var(--container), 100% - var(--space-4)); }
  .header-shell { width: min(var(--container), 100% - var(--space-3)); }
  .header-cta { display: none; }
  .grid-12 { grid-template-columns: minmax(0, 1fr); }
  .grid-12 > [class*="col-"] { grid-column: 1 / -1; }
  .footer-shell { padding: var(--space-4); }
  .footer-grid { grid-template-columns: minmax(0, 1fr); }
  .footer-legal { margin-top: var(--space-6); }
}

/* ---------- 8 · 无障碍与动效偏好 ---------- */
@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
}
@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;
  }
  .scroll-progress-bar { transition: none; }
}