/* ============================================================
   星空体育入口 / site.css
   深空蓝黑底 + 星轨紫 + 电光青，文字建筑式共享外壳
   ============================================================ */

/* ---------- 1. Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body, h1, h2, h3, h4, h5, h6, p, ul, ol, li, figure, blockquote, dl, dd, table { margin: 0; padding: 0; }
ul, ol { list-style: none; }
img, svg, video { display: block; max-width: 100%; }
button, input, select, textarea { font: inherit; color: inherit; background: none; border: 0; }
button { cursor: pointer; }
a { color: inherit; text-decoration: none; }
table { border-collapse: collapse; width: 100%; }
:where(a, button, summary, [tabindex]):focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 2px;
}
#main-content:focus { outline: none; }

/* ---------- 2. 设计变量 ---------- */
:root {
  --ink: #070B14;
  --ink-2: #0E1624;
  --ink-3: #0A0F1A;
  --rock: #2A3138;
  --violet: #6F5BFF;
  --cyan: #2FE6E6;
  --grass: #2F8F5B;
  --lime: #C7F464;
  --bone: #F3F0E9;
  --moss: #5E6B4E;
  --clay: #B86B4B;

  --text: #F3F0E9;
  --text-soft: rgba(243, 240, 233, .74);
  --text-dim: rgba(243, 240, 233, .46);
  --line: rgba(42, 49, 56, .95);
  --line-soft: rgba(243, 240, 233, .10);
  --glass: rgba(14, 22, 36, .62);

  --font-serif: "Source Serif Pro", "Noto Serif SC", "Songti SC", Georgia, "STSong", serif;
  --font-ui: "Archivo Narrow", "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --font-body: Inter, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, sans-serif;

  --step--2: clamp(.68rem, .66rem + .1vw, .75rem);
  --step--1: clamp(.79rem, .76rem + .15vw, .88rem);
  --step-0: clamp(1rem, .98rem + .2vw, 1.0625rem);
  --step-1: clamp(1.15rem, 1.08rem + .3vw, 1.35rem);
  --step-2: clamp(1.45rem, 1.28rem + .8vw, 1.95rem);
  --step-3: clamp(1.9rem, 1.55rem + 1.7vw, 2.9rem);
  --step-4: clamp(2.4rem, 1.85rem + 3vw, 4.2rem);
  --step-5: clamp(3.1rem, 1.9rem + 9vw, 8rem);

  --gap: clamp(16px, 2vw, 28px);
  --pad-x: clamp(18px, 5vw, 56px);
  --radius: 4px;
  --ease: cubic-bezier(.22, .61, .36, 1);

  --coord-h: 32px;
  --header-bar-h: 74px;
  --header-offset: calc(var(--header-bar-h) + var(--coord-h));
}
@media (max-width: 900px) {
  :root { --coord-h: 0px; --header-bar-h: 62px; }
}

/* ---------- 3. 基础排版 ---------- */
@media (prefers-reduced-motion: no-preference) { html { scroll-behavior: smooth; } }

body {
  min-height: 100vh;
  overflow-x: hidden;
  background-color: var(--ink);
  color: var(--text);
  font-family: var(--font-body);
  font-size: var(--step-0);
  line-height: 1.75;
  letter-spacing: .012em;
  -webkit-font-smoothing: antialiased;
}
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(900px 620px at 10% -12%, rgba(111, 91, 255, .24), transparent 62%),
    radial-gradient(720px 520px at 94% 4%, rgba(47, 230, 230, .13), transparent 66%),
    radial-gradient(680px 480px at 50% 108%, rgba(94, 107, 78, .18), transparent 68%);
}
body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: .35;
  background-image:
    linear-gradient(rgba(243, 240, 233, .028) 1px, transparent 1px),
    linear-gradient(90deg, rgba(243, 240, 233, .028) 1px, transparent 1px);
  background-size: 120px 120px, 120px 120px;
}

h1, h2 { font-family: var(--font-serif); font-weight: 600; line-height: 1.18; letter-spacing: -.006em; }
h3 { font-family: var(--font-serif); font-weight: 600; font-size: var(--step-2); line-height: 1.28; }
h4 { font-family: var(--font-ui); font-weight: 600; font-size: var(--step-1); letter-spacing: .04em; }
strong { color: var(--bone); font-weight: 600; }
hr { border: 0; border-top: 1px solid var(--line); }

.site-header, .site-main, .site-footer { position: relative; z-index: 1; }
.site-main { display: block; }
.site-main--offset { padding-top: var(--header-offset); }

/* ---------- 4. Skip link ---------- */
.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 200;
  padding: 10px 16px;
  background: var(--cyan);
  color: var(--ink);
  font-family: var(--font-ui);
  font-weight: 700;
  font-size: var(--step--1);
  letter-spacing: .08em;
  border-radius: var(--radius);
  transform: translateY(-240%);
  transition: transform .2s var(--ease);
}
.skip-link:focus { transform: translateY(0); }

/* ---------- 5. 头部外壳 ---------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 80;
  color: var(--bone);
  background: linear-gradient(180deg, rgba(7, 11, 20, .74) 0%, rgba(7, 11, 20, .28) 62%, rgba(7, 11, 20, 0) 100%);
  backdrop-filter: blur(0px);
  transition: background-color .3s var(--ease), backdrop-filter .3s var(--ease), box-shadow .3s var(--ease);
}
.site-header[data-scrolled] {
  background: rgba(7, 11, 20, .97);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
  box-shadow: 0 24px 48px -34px rgba(0, 0, 0, .95);
}
.site-header[data-open] { background: rgba(7, 11, 20, .99); backdrop-filter: blur(12px); }

.header-coord {
  max-height: 40px;
  overflow: hidden;
  border-bottom: 1px solid var(--line-soft);
  transition: max-height .3s var(--ease), opacity .25s var(--ease), border-color .25s var(--ease);
}
.site-header[data-scrolled] .header-coord { max-height: 0; opacity: 0; border-color: transparent; }
.header-coord__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
  max-width: 1360px;
  margin: 0 auto;
  padding: 8px var(--pad-x);
  font-family: var(--font-mono);
  font-size: var(--step--2);
  letter-spacing: .16em;
  color: var(--text-dim);
}
.coord-mark, .coord-clock { white-space: nowrap; }
.coord-time { color: var(--cyan); letter-spacing: .12em; }
.coord-sep { width: 1px; height: 12px; background: var(--rock); }
.coord-state {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-left: auto;
  color: rgba(243, 240, 233, .55);
  white-space: nowrap;
}
.state-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--grass);
  box-shadow: 0 0 0 3px rgba(47, 143, 91, .2);
}

.header-bar {
  display: flex;
  align-items: center;
  gap: clamp(10px, 2vw, 30px);
  max-width: 1440px;
  min-height: var(--header-bar-h);
  margin: 0 auto;
  padding: 10px var(--pad-x);
}

.brand {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 2px;
  flex: 0 0 auto;
  padding-right: clamp(10px, 2vw, 26px);
}
.brand::after {
  content: "";
  position: absolute;
  top: 4px;
  bottom: 4px;
  right: 0;
  width: 1px;
  background: var(--line-soft);
}
.brand__mark {
  font-family: var(--font-ui);
  font-weight: 700;
  font-size: clamp(1.05rem, 1.5vw, 1.28rem);
  letter-spacing: .07em;
  color: var(--bone);
  transition: color .2s var(--ease);
}
.brand:hover .brand__mark { color: var(--cyan); }
.brand__tag {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .16em;
  color: var(--text-dim);
}

/* 导航 */
.site-nav {
  display: flex;
  align-items: center;
  gap: clamp(10px, 1.8vw, 26px);
  margin-left: auto;
}
.site-nav__list {
  display: flex;
  align-items: center;
  gap: clamp(4px, 1.3vw, 20px);
}
.site-nav__link {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 6px 2px;
  font-family: var(--font-ui);
  font-size: var(--step--1);
  letter-spacing: .09em;
  color: var(--text-soft);
  transition: color .2s var(--ease), transform .2s var(--ease);
}
.site-nav__index {
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: .1em;
  color: var(--rock);
  transition: color .2s var(--ease);
}
.site-nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .22s var(--ease);
}
.site-nav__link:hover, .site-nav__link:focus-visible { color: var(--bone); transform: translateY(-2px); }
.site-nav__link:hover::after, .site-nav__link:focus-visible::after { transform: scaleX(1); }
.site-nav__link:hover .site-nav__index { color: var(--cyan); }
.site-nav__link[aria-current="page"] { color: var(--bone); }
.site-nav__link[aria-current="page"]::after { transform: scaleX(1); }
.site-nav__link[aria-current="page"] .site-nav__index { color: var(--cyan); }
.site-nav__aside { display: none; }
.site-nav__coord {
  font-family: var(--font-mono);
  font-size: var(--step--2);
  letter-spacing: .16em;
  color: var(--text-dim);
}

.header-actions { display: flex; align-items: center; gap: 10px; flex: 0 0 auto; }

/* 导航按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  padding: 9px 13px;
  border: 1px solid var(--rock);
  border-radius: var(--radius);
  color: var(--text-soft);
  font-family: var(--font-ui);
  font-size: var(--step--1);
  letter-spacing: .1em;
  transition: border-color .2s var(--ease), color .2s var(--ease), background-color .2s var(--ease);
}
.nav-toggle:hover { border-color: var(--cyan); color: var(--cyan); }
.nav-toggle__bars { position: relative; display: block; width: 18px; height: 12px; }
.nav-toggle__bars span {
  position: absolute;
  left: 0;
  width: 100%;
  height: 1.5px;
  background: currentColor;
  transition: transform .22s var(--ease);
}
.nav-toggle__bars span:first-child { top: 0; }
.nav-toggle__bars span:last-child { bottom: 0; }
.site-header[data-open] .nav-toggle__bars span:first-child { transform: translateY(5.25px) rotate(45deg); }
.site-header[data-open] .nav-toggle__bars span:last-child { transform: translateY(-5.25px) rotate(-45deg); }

/* 滚动进度刻度 */
.scroll-progress {
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 100%;
  height: 2px;
  transform: scaleX(0);
  transform-origin: left center;
  background: linear-gradient(90deg, var(--violet), var(--cyan) 72%, var(--lime));
  opacity: .92;
}

/* ---------- 6. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 20px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-family: var(--font-ui);
  font-size: var(--step--1);
  font-weight: 600;
  letter-spacing: .1em;
  line-height: 1;
  transition: background-color .22s var(--ease), color .22s var(--ease), border-color .22s var(--ease), transform .22s var(--ease);
}
.btn--solid {
  background: var(--violet);
  color: var(--bone);
  box-shadow: 0 14px 32px -20px rgba(111, 91, 255, .95);
}
.btn--solid:hover, .btn--solid:focus-visible { background: var(--cyan); color: var(--ink); transform: translateY(-2px); }
.btn--ghost {
  border-color: var(--rock);
  background: rgba(243, 240, 233, .02);
  color: var(--text-soft);
}
.btn--ghost:hover, .btn--ghost:focus-visible { border-color: var(--cyan); color: var(--cyan); transform: translateY(-2px); }
.btn--quiet {
  padding: 6px 0;
  border: 0;
  color: var(--cyan);
  background: none;
}
.btn--quiet::after { content: "\2192"; transition: transform .2s var(--ease); }
.btn--quiet:hover, .btn--quiet:focus-visible { color: var(--lime); }
.btn--quiet:hover::after, .btn--quiet:focus-visible::after { transform: translateX(4px); }

/* ---------- 7. 容器 / 章节 ---------- */
.container { width: 100%; max-width: 1180px; margin: 0 auto; padding-inline: var(--pad-x); }
.container--wide { max-width: 1360px; }
.section { padding-block: clamp(56px, 8vw, 118px); }
.section--tight { padding-block: clamp(34px, 5vw, 64px); }
.section--alt { background: var(--ink-2); border-block: 1px solid var(--line); }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: var(--step--2);
  letter-spacing: .22em;
  color: var(--cyan);
}
.eyebrow::before {
  content: "";
  width: 26px;
  height: 1px;
  background: linear-gradient(90deg, var(--violet), var(--cyan));
}
.section__title {
  font-family: var(--font-serif);
  font-size: var(--step-3);
  line-height: 1.2;
  margin-top: 14px;
  color: var(--bone);
}
.section__lead {
  max-width: 62ch;
  margin-top: 14px;
  font-size: var(--step-0);
  line-height: 1.85;
  color: var(--text-soft);
}

/* ---------- 8. 栅格 ---------- */
.grid { display: grid; gap: var(--gap); grid-template-columns: repeat(auto-fit, minmax(min(260px, 100%), 1fr)); }
.grid--2 { grid-template-columns: repeat(auto-fit, minmax(min(320px, 100%), 1fr)); }
.grid--3 { grid-template-columns: repeat(auto-fit, minmax(min(240px, 100%), 1fr)); }
.grid--4 { grid-template-columns: repeat(auto-fit, minmax(min(190px, 100%), 1fr)); }
.split {
  display: grid;
  gap: clamp(24px, 4vw, 64px);
  grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
  align-items: start;
}
.split--flip { grid-template-columns: minmax(0, .85fr) minmax(0, 1.15fr); }
@media (max-width: 900px) { .split, .split--flip { grid-template-columns: minmax(0, 1fr); } }

/* ---------- 9. 卡片 ---------- */
.card {
  position: relative;
  padding: clamp(18px, 2.2vw, 28px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(158deg, rgba(243, 240, 233, .065), rgba(243, 240, 233, .018));
  backdrop-filter: blur(8px);
  transition: border-color .24s var(--ease), transform .24s var(--ease);
}
.card:hover { border-color: rgba(47, 230, 230, .55); transform: translateY(-3px); }
.card--solid { background: var(--ink-2); backdrop-filter: none; }
.card--accent { border-left: 2px solid var(--violet); }
.card__meta {
  margin-bottom: 12px;
  font-family: var(--font-mono);
  font-size: var(--step--2);
  letter-spacing: .16em;
  color: var(--text-dim);
}
.card__title {
  margin-bottom: 10px;
  font-family: var(--font-ui);
  font-size: var(--step-1);
  font-weight: 600;
  letter-spacing: .04em;
  color: var(--bone);
}
.card__body { font-size: var(--step--1); line-height: 1.78; color: var(--text-soft); }

/* ---------- 10. 状态标签 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 10px;
  border: 1px solid var(--rock);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: var(--step--2);
  letter-spacing: .14em;
  color: var(--text-dim);
  transition: color .2s var(--ease), border-color .2s var(--ease), background-color .2s var(--ease);
}
.tag--live { color: var(--grass); border-color: rgba(47, 143, 91, .6); background: rgba(47, 143, 91, .1); }
.tag--live::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: var(--grass); }
.tag--done { color: var(--text-dim); }
.tag--soon { color: var(--cyan); border-color: rgba(47, 230, 230, .45); background: rgba(47, 230, 230, .08); }
.tag--num { color: var(--lime); border-color: rgba(199, 244, 100, .4); background: rgba(199, 244, 100, .08); }

/* ---------- 11. 面包屑 ---------- */
.breadcrumb { padding-block: 16px; border-bottom: 1px solid var(--line-soft); }
.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: var(--step--2);
  letter-spacing: .14em;
  color: var(--text-dim);
}
.breadcrumb__item { display: flex; align-items: center; gap: 10px; }
.breadcrumb__link { color: var(--text-dim); transition: color .2s var(--ease); }
.breadcrumb__link:hover, .breadcrumb__link:focus-visible { color: var(--cyan); }
.breadcrumb__sep { color: var(--rock); }
.breadcrumb__item[aria-current="page"] { color: var(--text-soft); }

/* ---------- 12. 长文 ---------- */
.prose {
  max-width: 68ch;
  font-size: clamp(1rem, .98rem + .2vw, 1.09rem);
  line-height: 1.88;
  color: var(--text-soft);
}
.prose > * + * { margin-top: 1.15em; }
.prose h2 {
  margin-top: 2em;
  padding-top: .6em;
  border-top: 1px solid var(--line);
  font-family: var(--font-serif);
  font-size: var(--step-2);
  color: var(--bone);
}
.prose h3 {
  margin-top: 1.6em;
  font-family: var(--font-ui);
  font-size: var(--step-1);
  letter-spacing: .04em;
  color: var(--bone);
}
.prose a { color: var(--cyan); border-bottom: 1px solid rgba(47, 230, 230, .35); transition: color .2s var(--ease), border-color .2s var(--ease); }
.prose a:hover, .prose a:focus-visible { color: var(--lime); border-color: var(--lime); }
.prose ul, .prose ol { padding-left: 1.2em; }
.prose ul li { position: relative; padding-left: .9em; }
.prose ul li::before { content: ""; position: absolute; left: 0; top: .82em; width: 7px; height: 1px; background: var(--cyan); }
.prose ol { list-style: decimal; }
.prose ol li::marker { color: var(--cyan); font-family: var(--font-mono); }
.prose blockquote {
  padding: 6px 0 6px 18px;
  border-left: 2px solid var(--moss);
  font-family: var(--font-serif);
  font-size: 1.06em;
  color: var(--bone);
}
.prose code {
  padding: 2px 6px;
  border-radius: 2px;
  background: rgba(111, 91, 255, .14);
  font-family: var(--font-mono);
  font-size: .9em;
  color: var(--cyan);
}
.prose img { border-radius: var(--radius); }
.prose hr { border: 0; border-top: 1px solid var(--line); margin-block: 2em; }

/* ---------- 13. 刻度分隔线 ---------- */
.divider {
  position: relative;
  height: 1px;
  margin-block: clamp(28px, 5vw, 56px);
  background: var(--line);
}
.divider::after {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 8px;
  background-image: repeating-linear-gradient(90deg, var(--rock) 0 1px, transparent 1px 56px);
}

/* ---------- 14. 数据组件 ---------- */
.stat { display: flex; flex-direction: column; gap: 6px; }
.stat__value {
  font-family: var(--font-mono);
  font-size: clamp(2.1rem, 1.4rem + 4vw, 4rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--lime);
}
.stat__label {
  font-family: var(--font-mono);
  font-size: var(--step--2);
  letter-spacing: .2em;
  color: var(--text-dim);
}

.data-table { font-size: var(--step--1); }
.data-table caption {
  padding-bottom: 12px;
  text-align: left;
  font-family: var(--font-mono);
  font-size: var(--step--2);
  letter-spacing: .18em;
  color: var(--text-dim);
}
.data-table th, .data-table td {
  padding: 12px 14px;
  border-bottom: 1px solid var(--line-soft);
  text-align: left;
  vertical-align: top;
}
.data-table th {
  border-bottom-color: var(--rock);
  font-family: var(--font-mono);
  font-size: var(--step--2);
  font-weight: 500;
  letter-spacing: .16em;
  color: var(--text-dim);
}
.data-table tbody tr { transition: background-color .2s var(--ease); }
.data-table tbody tr:hover { background: rgba(111, 91, 255, .09); }
.data-table .num { font-family: var(--font-mono); color: var(--lime); letter-spacing: .04em; }

/* ---------- 15. 目录 ---------- */
.toc {
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(14, 22, 36, .6);
}
.toc__list { display: flex; flex-direction: column; gap: 2px; }
.toc__link {
  display: block;
  padding: 7px 0 7px 14px;
  border-left: 1px solid var(--line);
  font-size: var(--step--1);
  color: var(--text-soft);
  transition: color .2s var(--ease), border-color .2s var(--ease), padding-left .2s var(--ease);
}
.toc__link:hover, .toc__link:focus-visible { color: var(--cyan); border-color: var(--cyan); padding-left: 18px; }
.toc__link[aria-current="true"] { color: var(--lime); border-color: var(--lime); }

/* ---------- 16. 图片容器 ---------- */
.media-frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background:
    radial-gradient(120% 120% at 12% 8%, rgba(111, 91, 255, .3), transparent 56%),
    radial-gradient(90% 90% at 88% 92%, rgba(47, 230, 230, .18), transparent 62%),
    var(--ink-2);
}
.media-frame img { width: 100%; height: 100%; object-fit: cover; filter: saturate(.86) contrast(1.05); }
.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: .32;
  background-image: linear-gradient(rgba(243, 240, 233, .06) 1px, transparent 1px);
  background-size: 100% 6px;
}
.media-frame__caption {
  position: absolute;
  left: 14px;
  bottom: 12px;
  z-index: 2;
  padding: 4px 9px;
  border: 1px solid var(--line-soft);
  background: rgba(7, 11, 20, .68);
  font-family: var(--font-mono);
  font-size: var(--step--2);
  letter-spacing: .16em;
  color: var(--text-soft);
}
.media-frame--tall { aspect-ratio: 3 / 4; }
.media-frame--wide { aspect-ratio: 21 / 9; }
@media (max-width: 620px) { .media-frame--wide { aspect-ratio: 16 / 9; } }

/* ---------- 17. 显现 ---------- */
[data-js="on"] .reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity .52s var(--ease), transform .52s var(--ease);
}
[data-js="on"] .reveal.is-visible { opacity: 1; transform: none; }

/* ---------- 18. 页脚 ---------- */
.site-footer {
  margin-top: clamp(48px, 8vw, 110px);
  border-top: 1px solid var(--line);
  background: linear-gradient(180deg, var(--ink) 0%, var(--ink-2) 42%, var(--ink-3) 100%);
}
.site-footer::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: min(46%, 420px);
  height: 2px;
  background: linear-gradient(90deg, var(--violet), var(--cyan));
}
.footer-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(0, .9fr) minmax(0, 1.3fr);
  gap: clamp(28px, 4vw, 56px);
  align-items: start;
  max-width: 1360px;
  margin: 0 auto;
  padding: clamp(42px, 6vw, 76px) var(--pad-x) clamp(30px, 4vw, 50px);
}
.footer-brand__line {
  max-width: 26ch;
  font-family: var(--font-serif);
  font-size: var(--step-1);
  line-height: 1.5;
  color: var(--bone);
}
.footer-brand__coord, .footer-brand__meta {
  margin-top: 14px;
  padding-left: 14px;
  border-left: 1px solid var(--moss);
  font-family: var(--font-mono);
  font-size: var(--step--2);
  letter-spacing: .16em;
  color: var(--text-dim);
}
.footer-brand__meta { border-left-color: var(--rock); }

.footer-col__title {
  margin-bottom: 18px;
  font-family: var(--font-mono);
  font-size: var(--step--2);
  font-weight: 500;
  letter-spacing: .22em;
  color: var(--cyan);
}
.footer-list li + li { margin-top: 10px; }
.footer-list a {
  display: inline-block;
  font-family: var(--font-ui);
  font-size: var(--step--1);
  letter-spacing: .06em;
  color: var(--text-soft);
  transition: color .2s var(--ease), transform .2s var(--ease);
}
.footer-list a:hover, .footer-list a:focus-visible { color: var(--cyan); transform: translateX(3px); }

.footer-contact li + li { margin-top: 10px; }
.copy-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 2px 0;
  border-bottom: 1px dashed var(--rock);
  font-family: var(--font-mono);
  font-size: var(--step--1);
  letter-spacing: .05em;
  color: var(--text-soft);
  transition: color .2s var(--ease), border-color .2s var(--ease);
}
.copy-btn::after {
  content: "复制";
  font-family: var(--font-ui);
  font-size: 10px;
  letter-spacing: .16em;
  color: var(--rock);
  transition: color .2s var(--ease);
}
.copy-btn:hover, .copy-btn:focus-visible { color: var(--cyan); border-color: var(--cyan); }
.copy-btn:hover::after { color: var(--cyan); }
.copy-btn[data-copied="true"] { color: var(--lime); border-color: var(--lime); }
.copy-btn[data-copied="true"]::after { content: "已复制"; color: var(--lime); }

.footer-contact__addr {
  max-width: 34ch;
  margin-top: 16px;
  font-size: var(--step--1);
  line-height: 1.75;
  color: var(--text-dim);
}
.footer-note {
  max-width: 40ch;
  margin-top: 16px;
  padding-left: 14px;
  border-left: 1px solid var(--moss);
  font-size: var(--step--1);
  line-height: 1.8;
  color: var(--text-dim);
}
.footer-contact__link {
  display: inline-block;
  margin-top: 18px;
  padding-bottom: 2px;
  border-bottom: 1px solid rgba(47, 230, 230, .38);
  font-family: var(--font-ui);
  font-size: var(--step--1);
  letter-spacing: .08em;
  color: var(--cyan);
  transition: color .2s var(--ease), border-color .2s var(--ease), transform .2s var(--ease);
}
.footer-contact__link:hover, .footer-contact__link:focus-visible { color: var(--lime); border-color: var(--lime); transform: translateX(3px); }

.footer-legal { border-top: 1px solid var(--line); background: rgba(7, 11, 20, .72); }
.footer-legal__bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px 28px;
  max-width: 1360px;
  margin: 0 auto;
  padding: 20px var(--pad-x) 30px;
}
.footer-legal__links { display: flex; flex-wrap: wrap; gap: 18px; }
.footer-legal__links a {
  padding-bottom: 2px;
  border-bottom: 1px solid transparent;
  font-family: var(--font-ui);
  font-size: var(--step--1);
  letter-spacing: .06em;
  color: var(--text-dim);
  transition: color .2s var(--ease), border-color .2s var(--ease);
}
.footer-legal__links a:hover, .footer-legal__links a:focus-visible { color: var(--cyan); border-color: var(--cyan); }
.footer-legal__meta {
  font-family: var(--font-mono);
  font-size: var(--step--2);
  letter-spacing: .14em;
  color: var(--text-dim);
}

/* ---------- 19. 响应式：头部与页脚 ---------- */
@media (max-width: 1180px) {
  .brand__tag { display: none; }
}
@media (max-width: 900px) {
  .header-coord { display: none; }
  .brand::after { display: none; }
  .nav-toggle { display: inline-flex; }
  .header-cta { display: none; }

  .site-nav {
    position: fixed;
    top: var(--header-bar-h);
    left: 0;
    right: 0;
    z-index: 79;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    margin: 0;
    max-height: calc(100vh - var(--header-bar-h));
    padding: 18px var(--pad-x) 34px;
    overflow-y: auto;
    background: rgba(7, 11, 20, .985);
    border-bottom: 1px solid var(--line);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transform: translateY(-12px);
    transition: opacity .22s var(--ease), transform .22s var(--ease), visibility .22s var(--ease);
  }
  .site-header[data-open] .site-nav {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: none;
  }
  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    border-top: 1px solid var(--line-soft);
  }
  .site-nav__item { border-bottom: 1px solid var(--line-soft); }
  .site-nav__link {
    align-items: center;
    gap: 14px;
    padding: 16px 2px;
    font-size: 1.08rem;
  }
  .site-nav__link::after { display: none; }
  .site-nav__link[aria-current="page"] { color: var(--cyan); }
  .site-nav__aside {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
    margin-top: 24px;
  }
  .footer-grid { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); }
}
@media (max-width: 620px) {
  .footer-grid { grid-template-columns: minmax(0, 1fr); }
  .footer-legal__bar { padding-bottom: 24px; }
}

/* ---------- 20. 降低动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
  [data-js="on"] .reveal { opacity: 1; transform: none; }
  .scroll-progress { transition: none; }
}