/* ============================================================
   星空体育 · 共享样式表 /assets/site.css
   纸张叠层 · 夜场星图 · 刊物编辑感
   页面特色布局由页面专属 CSS 承接，本文件只负责
   reset / 变量 / 中文排版 / 头部 / 页脚 / 通用组件 / 栅格
   ============================================================ */

:root {
  --color-surface: #ecebea;
  --color-surface-alt: #e4e2e1;
  --color-surface-deep: #d8d7d5;
  --color-ink: #434138;
  --color-ink-soft: #666457;
  --color-ink-muted: #838172;
  --color-line: #ceccca;
  --color-primary: #7e7434;
  --color-primary-ink: #ffffff;
  --color-primary-soft: #dddad1;
  --color-accent: #a9650e;
  --color-accent-ink: #ffffff;
  --color-highlight: #e0d3c2;
  --color-focus: #9a5805;
  --color-contrast-surface: #1e1d15;
  --color-contrast-ink: #e7e6e4;
  --color-contrast-line: #4a4943;
  --color-contrast-accent: #eb8c14;
  --overlay-scrim: linear-gradient(180deg, rgba(30, 29, 21, 0.35) 0%, rgba(30, 29, 21, 0.72) 55%, rgba(30, 29, 21, 0.92) 100%);
  --font-heading: "Songti SC", "Source Han Serif SC", "Noto Serif SC", SimSun, serif;
  --font-body: "PingFang SC", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  --font-mono: ui-monospace, Menlo, Consolas, monospace;
  --text-xs: 12.9px;
  --text-sm: 15.5px;
  --text-base: 17px;
  --text-lg: 20.4px;
  --text-xl: 24.5px;
  --text-2xl: 29.4px;
  --text-3xl: 35.3px;
  --text-4xl: 42.3px;
  --text-display: clamp(34px, 6.6vw, 84px);
  --text-figure: clamp(28px, 4.7vw, 60px);
  --weight-heading: 655;
  --weight-body: 400;
  --leading-body: 1.83;
  --leading-heading: 1.21;
  --tracking-heading: -0.006em;
  --radius-sm: 2px;
  --radius-md: 4px;
  --radius-lg: 7px;
  --radius-pill: 7px;
  --border-thin: 1px;
  --border-thick: 1px;
  --shadow-1: 0 1px 0 rgba(67, 65, 56, 0.12);
  --shadow-2: 0 2px 0 rgba(67, 65, 56, 0.18);
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-6: 48px;
  --space-8: 64px;
  --container: 1140px;
  --measure: 67ch;
  --gutter: 32px;
  --section-y: 84px;
  --section-y-lg: 118px;
}

/* ---------- 1. Reset 与纸面基底 ---------- */

*,
*::before,
*::after { box-sizing: border-box; }

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

body {
  margin: 0;
  background-color: var(--color-surface);
  background-image: repeating-linear-gradient(
    180deg,
    color-mix(in srgb, var(--color-line) 32%, transparent) 0,
    color-mix(in srgb, var(--color-line) 32%, transparent) 1px,
    transparent 1px,
    transparent 118px
  );
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: var(--weight-body);
  line-height: var(--leading-body);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

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

button,
input,
select,
textarea { font: inherit; color: inherit; }

a { color: inherit; }

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

/* ---------- 2. 焦点与可访问性 ---------- */

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

.section--contrast :focus-visible,
.panel--dark :focus-visible,
.band--dark :focus-visible,
.site-footer :focus-visible,
.header-utility :focus-visible {
  outline-color: var(--color-contrast-accent);
}

.skip-link {
  position: absolute;
  left: var(--space-2);
  top: -96px;
  z-index: 300;
  padding: 10px 16px;
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border: var(--border-thin) solid var(--color-contrast-accent);
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  text-decoration: none;
  transition: top 160ms ease;
}
.skip-link:focus { top: var(--space-2); }

.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

/* ---------- 3. 中文排版与标题层级 ---------- */

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);
  margin: 0;
  color: var(--color-ink);
}

p { margin: 0; }

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

.display { font-size: var(--text-display); }
.h1 { font-size: var(--text-3xl); }
.h2 { font-size: var(--text-2xl); }
.h3 { font-size: var(--text-xl); }

.num,
.figure {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0;
}

.figure {
  display: block;
  font-size: var(--text-figure);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
}

.figure__unit {
  display: inline-block;
  margin-left: 0.4em;
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: var(--weight-body);
  color: var(--color-ink-muted);
  letter-spacing: 0;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  margin: 0;
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  color: var(--color-ink-muted);
}
.eyebrow::before {
  content: "";
  width: 18px;
  height: 1px;
  background: var(--color-primary);
}

.muted { color: var(--color-ink-muted); }
.soft { color: var(--color-ink-soft); }

.section--contrast .muted,
.section--contrast .soft,
.panel--dark .muted,
.panel--dark .soft,
.site-footer .muted,
.site-footer .soft {
  color: color-mix(in srgb, var(--color-contrast-ink) 68%, transparent);
}

.prose {
  max-width: var(--measure);
}
.prose > * + * { margin-top: var(--space-3); }
.prose h2 { font-size: var(--text-2xl); margin-top: var(--space-6); }
.prose h3 { font-size: var(--text-xl); margin-top: var(--space-4); }
.prose ul,
.prose ol { padding-left: 1.25em; list-style-position: outside; }
.prose li + li { margin-top: var(--space-1); }
.prose a {
  color: var(--color-accent);
  text-decoration: none;
  border-bottom: var(--border-thin) solid color-mix(in srgb, var(--color-accent) 45%, transparent);
  transition: border-color 160ms ease, color 160ms ease;
}
.prose a:hover { border-bottom-color: var(--color-accent); }
.section--contrast .prose a { color: var(--color-contrast-accent); }

/* ---------- 4. 布局：容器、栅格、区块 ---------- */

.wrap {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--space-3);
}

.section { padding-block: var(--section-y); }
.section--lg { padding-block: var(--section-y-lg); }
.section--tight { padding-block: var(--space-8); }
.section--alt { background: var(--color-surface-alt); }
.section--deep { background: var(--color-surface-deep); }
.section--contrast {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}
.section--contrast .h1,
.section--contrast .h2,
.section--contrast .h3,
.section--contrast .display { color: var(--color-contrast-ink); }

.grid {
  display: grid;
  gap: var(--gutter);
  grid-template-columns: repeat(12, minmax(0, 1fr));
}
.grid > * { min-width: 0; grid-column: span 12; }
.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--2 > *,
.grid--3 > *,
.grid--4 > * { grid-column: auto; }
.grid--split { grid-template-columns: minmax(0, 1fr) minmax(0, 2fr); }
.grid--split > * { grid-column: auto; }

.band {
  padding-block: var(--space-4);
  background: var(--color-surface-alt);
  border-top: var(--border-thin) solid var(--color-line);
  border-bottom: var(--border-thin) solid var(--color-line);
}
.band--dark {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-color: var(--color-contrast-line);
}
.band--dark .h2,
.band--dark .h3 { color: var(--color-contrast-ink); }

.rule {
  height: 1px;
  margin: 0;
  border: 0;
  background: var(--color-line);
}
.rule--ticked {
  height: 9px;
  background-color: transparent;
  background-image: repeating-linear-gradient(90deg, var(--color-line) 0, var(--color-line) 1px, transparent 1px, transparent 16px);
  background-size: 100% 9px;
  background-repeat: no-repeat;
  border-bottom: var(--border-thin) solid var(--color-line);
}
.section--contrast .rule,
.band--dark .rule { background: var(--color-contrast-line); }
.section--contrast .rule--ticked,
.band--dark .rule--ticked {
  background-image: repeating-linear-gradient(90deg, var(--color-contrast-line) 0, var(--color-contrast-line) 1px, transparent 1px, transparent 16px);
  border-bottom-color: var(--color-contrast-line);
}

/* ---------- 5. 纸片面板 ---------- */

.panel {
  position: relative;
  padding: var(--space-4);
  background: var(--color-surface-alt);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-1);
}
.panel--raised { background: var(--color-surface); }
.panel--deep { background: var(--color-surface-deep); }
.panel--dark {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-color: var(--color-contrast-line);
}
.panel--stacked {
  background: var(--color-surface);
  box-shadow: 8px 8px 0 var(--color-surface-deep), 8px 8px 0 1px var(--color-line);
}
.panel--dark.panel--stacked {
  background: color-mix(in srgb, var(--color-contrast-surface) 86%, var(--color-contrast-ink));
  box-shadow: 8px 8px 0 color-mix(in srgb, var(--color-contrast-ink) 12%, transparent);
}
.panel--sticker { padding-top: var(--space-6); }

.panel__title {
  margin: 0 0 var(--space-2);
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
}
.panel--dark .panel__title { color: var(--color-contrast-ink); }

.panel__meta {
  margin: 0;
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}
.panel--dark .panel__meta { color: color-mix(in srgb, var(--color-contrast-ink) 64%, transparent); }

.panel__body { margin-top: var(--space-2); }
.panel__foot {
  margin-top: var(--space-3);
  padding-top: var(--space-2);
  border-top: var(--border-thin) solid var(--color-line);
}
.panel--dark .panel__foot { border-top-color: var(--color-contrast-line); }

/* ---------- 6. 贴纸标签 ---------- */

.sticker {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  background: var(--color-primary);
  color: var(--color-primary-ink);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  line-height: 1.45;
  letter-spacing: 0.02em;
  text-decoration: none;
  white-space: nowrap;
  box-shadow: var(--shadow-1);
  transition: background-color 160ms ease, box-shadow 160ms ease, color 160ms ease;
}
.sticker--primary { background: var(--color-primary); color: var(--color-primary-ink); }
.sticker--accent { background: var(--color-accent); color: var(--color-accent-ink); }
.sticker--highlight { background: var(--color-highlight); color: var(--color-ink); }
.sticker--ghost {
  background: var(--color-surface-deep);
  color: var(--color-ink-soft);
  border: var(--border-thin) solid var(--color-line);
  box-shadow: none;
}
a.sticker:hover,
a.sticker:focus-visible {
  background: color-mix(in srgb, var(--color-primary) 78%, var(--color-contrast-surface));
  color: var(--color-primary-ink);
  box-shadow: var(--shadow-2);
}
a.sticker--accent:hover,
a.sticker--accent:focus-visible {
  background: color-mix(in srgb, var(--color-accent) 78%, var(--color-contrast-surface));
  color: var(--color-accent-ink);
}
a.sticker--highlight:hover,
a.sticker--highlight:focus-visible {
  background: color-mix(in srgb, var(--color-highlight) 82%, var(--color-ink));
  color: var(--color-ink);
}
a.sticker--ghost:hover,
a.sticker--ghost:focus-visible {
  background: color-mix(in srgb, var(--color-surface-deep) 82%, var(--color-ink));
  color: var(--color-ink);
}
.sticker--corner {
  position: absolute;
  top: calc(var(--space-2) * -1);
  right: var(--space-3);
  z-index: 2;
}

/* ---------- 7. 按钮与出口带 ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: 11px 20px;
  border: var(--border-thin) solid var(--color-primary);
  border-radius: var(--radius-sm);
  background: var(--color-primary);
  color: var(--color-primary-ink);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  line-height: 1.4;
  text-decoration: none;
  cursor: pointer;
  box-shadow: var(--shadow-1);
  transition: background-color 160ms ease, border-color 160ms ease, box-shadow 160ms ease, color 160ms ease;
}
.btn:hover,
.btn:focus-visible {
  background: color-mix(in srgb, var(--color-primary) 78%, var(--color-contrast-surface));
  border-color: color-mix(in srgb, var(--color-primary) 78%, var(--color-contrast-surface));
  box-shadow: var(--shadow-2);
}
.btn--accent {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: var(--color-accent-ink);
}
.btn--accent:hover,
.btn--accent:focus-visible {
  background: color-mix(in srgb, var(--color-accent) 78%, var(--color-contrast-surface));
  border-color: color-mix(in srgb, var(--color-accent) 78%, var(--color-contrast-surface));
}
.btn--ghost {
  background: transparent;
  color: var(--color-ink);
  border-color: var(--color-line);
  box-shadow: none;
}
.btn--ghost:hover,
.btn--ghost:focus-visible {
  background: var(--color-surface-alt);
  border-color: var(--color-ink-soft);
  color: var(--color-ink);
}
.section--contrast .btn--ghost,
.panel--dark .btn--ghost,
.band--dark .btn--ghost,
.site-footer .btn--ghost {
  color: var(--color-contrast-ink);
  border-color: var(--color-contrast-line);
}
.section--contrast .btn--ghost:hover,
.panel--dark .btn--ghost:hover,
.band--dark .btn--ghost:hover,
.site-footer .btn--ghost:hover {
  background: color-mix(in srgb, var(--color-contrast-ink) 12%, transparent);
  border-color: var(--color-contrast-ink);
}

.exit-band {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding: var(--space-4);
  background: var(--color-surface-alt);
  border: var(--border-thin) solid var(--color-line);
  border-left: 4px solid var(--color-primary);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-1);
}
.exit-band__text {
  margin: 0;
  max-width: 46ch;
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  line-height: var(--leading-heading);
}
.exit-band__action {
  flex-shrink: 0;
}
.section--contrast .exit-band,
.panel--dark .exit-band {
  background: color-mix(in srgb, var(--color-contrast-surface) 84%, var(--color-contrast-ink));
  border-color: var(--color-contrast-line);
  border-left-color: var(--color-contrast-accent);
}
.section--contrast .exit-band__text,
.panel--dark .exit-band__text { color: var(--color-contrast-ink); }

/* ---------- 8. 表格与数据带 ---------- */

.ledger-scroll {
  width: 100%;
  overflow-x: auto;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  background: var(--color-surface);
}
.ledger {
  width: 100%;
  min-width: 520px;
  border-collapse: collapse;
  font-size: var(--text-sm);
}
.ledger caption {
  padding: var(--space-2) var(--space-3);
  text-align: left;
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
  letter-spacing: 0.08em;
  border-bottom: var(--border-thin) solid var(--color-line);
}
.ledger th,
.ledger td {
  padding: 10px 14px;
  text-align: left;
  vertical-align: top;
  border-bottom: var(--border-thin) solid var(--color-line);
}
.ledger thead th {
  background: var(--color-surface-deep);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--color-ink-soft);
  white-space: nowrap;
}
.ledger tbody tr { transition: background-color 160ms ease; }
.ledger tbody tr:hover { background: var(--color-surface-alt); }
.ledger tbody tr:last-child th,
.ledger tbody tr:last-child td { border-bottom: 0; }
.ledger .num { color: var(--color-ink); }

/* ---------- 9. 图片容器（页面阶段放置占位图片） ---------- */

.media {
  position: relative;
  display: block;
  width: 100%;
  overflow: hidden;
  background-color: var(--color-contrast-surface);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
}
.media > img,
.media > picture > 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-3);
  right: var(--space-3);
  bottom: var(--space-3);
  z-index: 2;
  color: var(--color-contrast-ink);
  font-size: var(--text-xs);
  line-height: 1.7;
}
.media__caption .h3,
.media__caption .h2 { color: var(--color-contrast-ink); }
.media__tag {
  position: absolute;
  top: var(--space-2);
  right: var(--space-2);
  z-index: 2;
}
.media--wide { aspect-ratio: 16 / 9; }
.media--tall { aspect-ratio: 3 / 4; }
.media--band { aspect-ratio: 21 / 9; }
.media--square { aspect-ratio: 1 / 1; }
.media--starfall {
  background-image:
    radial-gradient(circle at 18% 26%, color-mix(in srgb, var(--color-contrast-ink) 70%, transparent) 0 1px, transparent 1.6px),
    radial-gradient(circle at 62% 12%, color-mix(in srgb, var(--color-contrast-accent) 82%, transparent) 0 1px, transparent 1.6px),
    radial-gradient(circle at 84% 58%, color-mix(in srgb, var(--color-contrast-ink) 42%, transparent) 0 1px, transparent 1.6px),
    radial-gradient(circle at 34% 78%, color-mix(in srgb, var(--color-contrast-ink) 55%, transparent) 0 1px, transparent 1.6px),
    radial-gradient(circle at 8% 62%, color-mix(in srgb, var(--color-contrast-ink) 36%, transparent) 0 1px, transparent 1.6px);
  background-size: 320px 240px;
  background-repeat: repeat;
}

/* ---------- 10. 面包屑 ---------- */

.breadcrumb { padding-top: var(--space-3); }
.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  gap: 4px var(--space-2);
  list-style: none;
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}
.breadcrumb__list li { display: inline-flex; align-items: center; gap: var(--space-2); }
.breadcrumb__list li + li::before {
  content: "/";
  color: var(--color-line);
}
.breadcrumb a {
  color: var(--color-ink-soft);
  text-decoration: none;
  border-bottom: var(--border-thin) solid var(--color-line);
  transition: color 160ms ease, border-color 160ms ease;
}
.breadcrumb a:hover,
.breadcrumb a:focus-visible {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}
.breadcrumb [aria-current="page"] { color: var(--color-ink); }

/* ---------- 11. 目录台阶（标签页） ---------- */

.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  border-bottom: var(--border-thin) solid var(--color-line);
}
.tabs__tab {
  margin-bottom: -1px;
  padding: 9px 15px;
  border: var(--border-thin) solid transparent;
  border-bottom: 0;
  border-radius: var(--radius-sm) var(--radius-sm) 0 0;
  background: transparent;
  font-family: var(--font-body);
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
  cursor: pointer;
  transition: background-color 160ms ease, color 160ms ease, box-shadow 160ms ease;
}
.tabs__tab:hover { background: var(--color-surface-alt); color: var(--color-ink); }
.tabs__tab[aria-selected="true"] {
  background: var(--color-surface);
  border-color: var(--color-line);
  color: var(--color-ink);
  box-shadow: inset 0 2px 0 var(--color-primary);
}
.tab-panel { padding-top: var(--space-3); }
.tab-panel[hidden] { display: none; }

/* ---------- 12. 引号强调与修正痕迹 ---------- */

.cite {
  position: relative;
  padding: var(--space-3) var(--space-4);
  background: var(--color-highlight);
  border-left: 4px solid var(--color-accent);
  border-radius: var(--radius-sm);
}
.cite__text {
  margin: 0;
  padding-left: var(--space-2);
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  line-height: 1.55;
  color: var(--color-ink);
}
.cite__text::before { content: "「"; }
.cite__text::after { content: "」"; }
.cite__toggle {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: var(--space-2);
  padding: 0;
  background: none;
  border: 0;
  font-family: var(--font-body);
  font-size: var(--text-xs);
  color: var(--color-accent);
  cursor: pointer;
  transition: color 160ms ease;
}
.cite__toggle::before {
  content: "▸";
  display: inline-block;
  transition: transform 160ms ease;
}
.cite[data-expanded] .cite__toggle::before { transform: rotate(90deg); }
.cite__toggle:hover { color: var(--color-focus); }
.cite__list {
  display: none;
  margin: var(--space-2) 0 0;
  padding: var(--space-2) 0 0 var(--space-2);
  list-style: none;
  border-top: var(--border-thin) solid color-mix(in srgb, var(--color-accent) 32%, transparent);
  font-size: var(--text-xs);
  color: var(--color-ink-soft);
}
.cite[data-expanded] .cite__list {
  display: grid;
  gap: var(--space-1);
}
.cite__list > li {
  display: flex;
  flex-wrap: wrap;
  gap: 4px var(--space-2);
}
.cite__list .num { color: var(--color-accent); }

/* ---------- 13. 头部 ---------- */

.site-header {
  position: relative;
  z-index: 60;
}

.header-utility {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-bottom: var(--border-thin) solid var(--color-contrast-line);
}
.header-utility__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 4px var(--space-4);
  min-height: 40px;
  padding-block: 7px;
}
.header-utility__brand {
  margin: 0;
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-contrast-ink);
}
.header-utility__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px var(--space-3);
  list-style: none;
  font-size: var(--text-xs);
}
.header-utility__link {
  color: var(--color-contrast-accent);
  text-decoration: none;
  border-bottom: var(--border-thin) solid transparent;
  transition: border-color 160ms ease, color 160ms ease;
}
.header-utility__link:hover,
.header-utility__link:focus-visible { border-bottom-color: currentColor; }
.header-utility__meta { color: color-mix(in srgb, var(--color-contrast-ink) 64%, transparent); }

.header-bar {
  position: sticky;
  top: 0;
  z-index: 60;
  background: var(--color-surface);
  border-bottom: var(--border-thin) solid var(--color-line);
  transition: box-shadow 160ms ease;
}
.site-header[data-scrolled] .header-bar {
  box-shadow: var(--shadow-2);
}
.header-bar__inner {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  min-height: 68px;
}

.brand {
  display: inline-flex;
  align-items: baseline;
  gap: var(--space-1);
  text-decoration: none;
  color: var(--color-ink);
  border-bottom: var(--border-thin) solid transparent;
  transition: border-color 160ms ease;
}
.brand:hover { border-bottom-color: var(--color-primary); }
.brand__mark {
  align-self: center;
  width: 10px;
  height: 10px;
  flex: 0 0 auto;
  border-radius: var(--radius-sm);
  background: var(--color-primary);
  box-shadow: var(--shadow-1);
}
.brand__name {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  letter-spacing: 0.05em;
}
.brand__sub {
  font-size: var(--text-xs);
  letter-spacing: 0.18em;
  color: var(--color-ink-muted);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 6px;
  margin-left: auto;
  padding: 8px 12px;
  background: var(--color-surface-alt);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: var(--text-xs);
  color: var(--color-ink);
  cursor: pointer;
  box-shadow: var(--shadow-1);
  transition: background-color 160ms ease, border-color 160ms ease;
}
.nav-toggle:hover { background: var(--color-surface-deep); border-color: var(--color-ink-muted); }
.nav-toggle__glyph {
  width: 12px;
  height: 12px;
  background-image:
    repeating-linear-gradient(0deg, var(--color-ink) 0, var(--color-ink) 1px, transparent 1px, transparent 4px),
    repeating-linear-gradient(90deg, var(--color-ink) 0, var(--color-ink) 1px, transparent 1px, transparent 4px);
}
.nav-toggle[aria-expanded="true"] { background: var(--color-primary); color: var(--color-primary-ink); border-color: var(--color-primary); }
.nav-toggle[aria-expanded="true"] .nav-toggle__glyph {
  background-image:
    repeating-linear-gradient(0deg, var(--color-primary-ink) 0, var(--color-primary-ink) 1px, transparent 1px, transparent 4px),
    repeating-linear-gradient(90deg, var(--color-primary-ink) 0, var(--color-primary-ink) 1px, transparent 1px, transparent 4px);
}

.site-nav { margin-left: auto; }
.site-nav__list {
  display: flex;
  align-items: stretch;
  gap: 2px;
  list-style: none;
}
.site-nav__link {
  display: block;
  padding: 10px 13px;
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: color 160ms ease, border-color 160ms ease, background-color 160ms ease;
}
.site-nav__link:hover,
.site-nav__link:focus-visible {
  color: var(--color-ink);
  background: var(--color-surface-alt);
}
.site-nav__link[aria-current="page"] {
  color: var(--color-ink);
  border-bottom-color: var(--color-primary);
}

/* ---------- 14. 页脚 ---------- */

.site-footer {
  margin-top: var(--section-y-lg);
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-top: var(--border-thin) solid var(--color-contrast-line);
}
.site-footer .wrap {
  padding-top: var(--space-6);
  padding-bottom: var(--space-4);
}
.footer-scale {
  height: 10px;
  background-image: repeating-linear-gradient(90deg, var(--color-contrast-line) 0, var(--color-contrast-line) 1px, transparent 1px, transparent 14px);
  background-size: 100% 10px;
  background-repeat: no-repeat;
  border-bottom: var(--border-thin) solid var(--color-contrast-line);
}
.footer-brand {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: var(--space-1) var(--space-3);
  padding: var(--space-4) 0 var(--space-3);
  border-bottom: var(--border-thin) solid var(--color-contrast-line);
}
.footer-brand__name {
  margin: 0;
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: var(--weight-heading);
  letter-spacing: 0.05em;
  color: var(--color-contrast-ink);
}
.footer-brand__note {
  margin: 0;
  max-width: 62ch;
  font-size: var(--text-xs);
  line-height: 1.7;
  color: color-mix(in srgb, var(--color-contrast-ink) 62%, transparent);
}
.footer-cols {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-6) var(--space-4);
  padding: var(--space-6) 0;
}
.footer-col__title {
  margin: 0 0 var(--space-2);
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.18em;
  color: var(--color-contrast-accent);
}
.footer-col__list {
  display: grid;
  gap: var(--space-1);
  list-style: none;
  font-size: var(--text-sm);
  line-height: 1.75;
}
.footer-col__list--plain { color: color-mix(in srgb, var(--color-contrast-ink) 78%, transparent); }
.footer-col__list--plain li + li { margin-top: var(--space-1); }
.footer-link {
  color: var(--color-contrast-ink);
  text-decoration: none;
  border-bottom: var(--border-thin) solid transparent;
  transition: color 160ms ease, border-color 160ms ease;
}
.footer-link:hover,
.footer-link:focus-visible {
  color: var(--color-contrast-accent);
  border-bottom-color: var(--color-contrast-accent);
}
.footer-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2) var(--space-4);
  padding-top: var(--space-3);
  border-top: var(--border-thin) solid var(--color-contrast-line);
  font-size: var(--text-xs);
  color: color-mix(in srgb, var(--color-contrast-ink) 62%, transparent);
}
.footer-legal__icp { margin: 0; }
.footer-legal__year { margin: 0; }
.footer-legal__links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  list-style: none;
}

/* ---------- 15. 响应式 ---------- */

@media (max-width: 1080px) {
  .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .site-nav__link { padding: 10px 10px; }
}

@media (max-width: 900px) {
  .header-utility__inner {
    flex-direction: column;
    align-items: flex-start;
    min-height: 0;
    padding-block: var(--space-1);
  }
  .header-bar__inner { min-height: 60px; }
  .brand__sub { display: none; }
  .nav-toggle { display: inline-flex; }
  .site-nav {
    display: none;
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    margin-left: 0;
    background: var(--color-surface);
    border-top: var(--border-thin) solid var(--color-line);
    border-bottom: var(--border-thin) solid var(--color-line);
    box-shadow: var(--shadow-2);
    max-height: calc(100vh - 140px);
    overflow-y: auto;
  }
  .site-nav[data-open] { display: block; }
  .site-nav__list { flex-direction: column; gap: 0; padding: var(--space-1) 0; }
  .site-nav__link {
    padding: 14px var(--space-3);
    font-size: var(--text-base);
    border-bottom: 0;
    border-left: 3px solid transparent;
  }
  .site-nav__link:hover,
  .site-nav__link:focus-visible { border-left-color: var(--color-line); background: var(--color-surface-alt); }
  .site-nav__link[aria-current="page"] {
    border-bottom: 0;
    border-left-color: var(--color-primary);
    background: var(--color-surface-alt);
  }
}

@media (max-width: 760px) {
  :root {
    --section-y: 64px;
    --section-y-lg: 84px;
    --gutter: 20px;
  }
  .grid--2,
  .grid--3,
  .grid--4,
  .grid--split { grid-template-columns: minmax(0, 1fr); }
  .footer-cols { grid-template-columns: minmax(0, 1fr); gap: var(--space-4); padding: var(--space-4) 0; }
  .footer-legal { flex-direction: column; align-items: flex-start; }
  .cite { padding: var(--space-2) var(--space-3); }
  .cite__text { font-size: var(--text-base); }
  .panel { padding: var(--space-3); }
  .panel--stacked { box-shadow: 6px 6px 0 var(--color-surface-deep), 6px 6px 0 1px var(--color-line); }
  .exit-band { padding: var(--space-3); }
  .sticker--corner { right: var(--space-2); }
}

@media (max-width: 460px) {
  .brand__name { font-size: var(--text-base); }
  .header-utility__brand { font-size: 11px; letter-spacing: 0.04em; }
  .sticker { font-size: 11px; padding: 3px 8px; }
}

/* ---------- 16. 减少动效 ---------- */

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ---------- 17. 打印 ---------- */

@media print {
  .site-header,
  .site-footer,
  .skip-link,
  .nav-toggle { display: none; }
  body { background: #ffffff; }
}