/* ============================================================
   /assets/site.css · 环球体育主站 共享样式
   夜间赛场灯光 + 技术蓝图网格 + 框架式导航
   ============================================================ */

/* ---------- 1. Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body, h1, h2, h3, h4, p, ul, ol, figure, blockquote, dl, dd { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img, svg, video { display: block; max-width: 100%; }
button { font: inherit; color: inherit; background: none; border: 0; padding: 0; cursor: pointer; }
a { color: inherit; text-decoration: none; }
table { border-collapse: collapse; }
[hidden] { display: none !important; }
html.is-nav-open { overflow: hidden; }

/* ---------- 2. 设计令牌 ---------- */
:root {
  --ink-0: #06132B;
  --ink-1: #0A1F44;
  --ink-2: #12305E;
  --carbon: #1B2432;
  --orange: #FF6B35;
  --cyan: #00E5FF;
  --cyan-soft: #7CF3FF;
  --amber: #FFB347;
  --graphite: #A6B2C2;
  --white: #FFFFFF;
  --text: #E4EBF5;
  --text-dim: #C3CEDD;

  --line: rgba(166, 178, 194, .16);
  --line-strong: rgba(166, 178, 194, .32);
  --line-cyan: rgba(0, 229, 255, .24);
  --line-orange: rgba(255, 107, 53, .38);

  --grid-size: 48px;
  --rail: 52px;
  --wrap-max: 1240px;
  --pad-x: 24px;
  --radius: 2px;

  --font-head: "Oswald", "Arial Narrow", "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Inter", "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-data: "JetBrains Mono", "SFMono-Regular", "Consolas", "Menlo", monospace;

  --ease: cubic-bezier(.22, 1, .36, 1);
  --dur: .28s;
  --inner-top: inset 0 1px 0 rgba(0, 229, 255, .14);
}

/* ---------- 3. 页面基底与蓝图网格 ---------- */
body {
  position: relative;
  min-height: 100vh;
  overflow-x: hidden;
  background-color: var(--ink-1);
  background-image:
    radial-gradient(1100px 580px at 76% -10%, rgba(0, 229, 255, .12), transparent 62%),
    radial-gradient(900px 520px at 6% 10%, rgba(255, 107, 53, .12), transparent 64%);
  background-repeat: no-repeat;
  color: var(--text);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(166, 178, 194, .07) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(166, 178, 194, .07) 1px, transparent 1px);
  background-size: var(--grid-size) var(--grid-size);
}

.site-header,
.site-footer,
main,
.to-top { position: relative; z-index: 1; }

::selection { background: rgba(255, 107, 53, .38); color: var(--white); }

/* ---------- 4. 中文排版 ---------- */
h1, h2, h3, h4 {
  font-family: var(--font-head);
  font-weight: 700;
  line-height: 1.08;
  letter-spacing: .01em;
  color: var(--white);
}
h1 { font-size: clamp(2.6rem, 6vw, 5rem); line-height: 1.02; }
h2 { font-size: clamp(1.8rem, 3.2vw, 2.8rem); }
h3 { font-size: 1.35rem; }
h4 { font-size: 1.0625rem; letter-spacing: .04em; }
p { color: var(--text-dim); }
strong { color: var(--white); font-weight: 600; }

.data-label {
  display: block;
  font-family: var(--font-data);
  font-size: .8125rem;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--graphite);
}
.idx {
  font-family: var(--font-data);
  font-size: .6875rem;
  letter-spacing: .2em;
  color: var(--cyan);
}
.eyebrow {
  display: inline-block;
  font-family: var(--font-data);
  font-size: .6875rem;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--cyan-soft);
}
.rule {
  display: block;
  flex: 1 1 80px;
  min-width: 60px;
  height: 1px;
  background: linear-gradient(90deg, var(--line-cyan), rgba(166, 178, 194, .05));
}
.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}
:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: var(--radius);
}
section[id], h2[id], h3[id] { scroll-margin-top: 112px; }

/* ---------- 5. 布局容器与网格 ---------- */
.wrap {
  width: 100%;
  max-width: var(--wrap-max);
  margin-inline: auto;
  padding-inline: var(--pad-x);
}
.section { padding: clamp(48px, 7vw, 88px) 0; }
.section__head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  gap: 12px 18px;
  margin-bottom: 28px;
}
.section__head h2 { flex: 0 1 auto; }

.grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: 24px;
}
.u-span-4 { grid-column: span 4; }
.u-span-5 { grid-column: span 5; }
.u-span-6 { grid-column: span 6; }
.u-span-7 { grid-column: span 7; }
.u-span-8 { grid-column: span 8; }
.u-span-12 { grid-column: span 12; }

/* ---------- 6. 跳转链接 ---------- */
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 200;
  padding: 12px 20px;
  background: var(--cyan);
  color: var(--ink-0);
  font-family: var(--font-data);
  font-size: .75rem;
  letter-spacing: .16em;
  text-transform: uppercase;
}
.skip-link:focus { left: 16px; top: 10px; }

/* ---------- 7. 左侧刻度立轨（框架式外框） ---------- */
.frame-rail { display: none; }

@media (min-width: 1280px) {
  body { padding-left: var(--rail); }
  .frame-rail {
    display: block;
    position: fixed;
    left: 0; top: 0; bottom: 0;
    width: var(--rail);
    z-index: 70;
    background-color: var(--ink-0);
    background-image: linear-gradient(180deg, rgba(0, 229, 255, .10), rgba(0, 229, 255, 0) 42%);
    border-right: 1px solid var(--line);
  }
  .frame-rail::before {
    content: "";
    position: absolute;
    top: 0; bottom: 0; right: 0;
    width: 8px;
    background-image: repeating-linear-gradient(to bottom,
      rgba(166, 178, 194, .45) 0 1px, transparent 1px 48px);
  }
  .frame-rail::after {
    content: "环球体育 · 赛场中枢";
    position: absolute;
    top: 50%; left: 50%;
    transform: translate(-50%, -50%) rotate(180deg);
    writing-mode: vertical-rl;
    font-family: var(--font-data);
    font-size: .6875rem;
    letter-spacing: .42em;
    color: rgba(166, 178, 194, .58);
    white-space: nowrap;
  }
}

/* ---------- 8. 页头 ---------- */
.site-header { z-index: 60; }

.header-top {
  background: var(--ink-0);
  border-bottom: 1px solid var(--line);
  color: var(--graphite);
  font-family: var(--font-data);
  font-size: .6875rem;
  letter-spacing: .14em;
  text-transform: uppercase;
}
.header-top__inner {
  display: flex;
  align-items: center;
  gap: 18px;
  min-height: 44px;
}
.header-top__coords {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  flex: 0 0 auto;
  color: rgba(166, 178, 194, .82);
}
.dot-mark {
  width: 6px; height: 6px;
  flex: none;
  background: var(--cyan);
  box-shadow: 0 0 10px rgba(0, 229, 255, .8);
}
.header-top__brand {
  margin-inline: auto;
  color: rgba(232, 238, 247, .72);
  letter-spacing: .24em;
}
.header-quick {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  flex: 0 0 auto;
}
.header-quick__link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 14px;
  color: var(--cyan-soft);
  border-left: 1px solid var(--line);
  transition: color var(--dur) var(--ease), background var(--dur) var(--ease);
}
.header-quick__link:last-child { border-right: 1px solid var(--line); }
.header-quick__link:hover {
  color: var(--ink-0);
  background: var(--cyan);
}

.header-bar {
  position: sticky;
  top: 0;
  z-index: 65;
  background: linear-gradient(180deg, rgba(6, 19, 43, .97), rgba(10, 31, 68, .92));
  border-bottom: 1px solid var(--line-cyan);
  backdrop-filter: blur(12px);
}
.header-bar__inner {
  position: relative;
  display: flex;
  align-items: center;
  gap: 20px;
  min-height: 76px;
}

.scroll-progress {
  position: absolute;
  left: 0; right: 0; bottom: -1px;
  height: 2px;
  transform: scaleX(var(--progress, 0));
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--orange), var(--cyan));
  pointer-events: none;
}

/* 品牌 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-height: 44px;
  padding: 6px 0;
  flex: 0 0 auto;
}
.brand__mark {
  display: grid;
  place-items: center;
  width: 40px; height: 40px;
  flex: none;
  background: linear-gradient(135deg, var(--orange), #FF9A3C 46%, var(--cyan));
  clip-path: polygon(0 0, 100% 0, 100% 74%, 74% 100%, 0 100%);
  color: var(--ink-0);
  font-family: var(--font-data);
  font-size: .75rem;
  font-weight: 700;
  letter-spacing: .02em;
}
.brand__text { display: flex; flex-direction: column; line-height: 1.1; }
.brand__name {
  font-family: var(--font-head);
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: .1em;
  color: var(--white);
}
.brand__sub {
  font-family: var(--font-data);
  font-size: .5625rem;
  letter-spacing: .26em;
  color: var(--cyan);
}

/* 桌面导航 */
.nav { margin-left: auto; }
.nav__list { display: flex; align-items: stretch; gap: 2px; }
.nav__item { display: flex; }
.nav__link {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 2px;
  min-height: 76px;
  min-width: 44px;
  padding: 10px 15px;
  border-bottom: 2px solid transparent;
  color: rgba(232, 238, 247, .78);
  transition: color var(--dur) var(--ease), background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.nav__idx {
  font-family: var(--font-data);
  font-size: .625rem;
  letter-spacing: .16em;
  color: var(--graphite);
  transition: color var(--dur) var(--ease);
}
.nav__label { font-size: .9375rem; letter-spacing: .04em; white-space: nowrap; }
.nav__link:hover {
  color: var(--white);
  background: linear-gradient(180deg, rgba(255, 107, 53, .16), rgba(255, 107, 53, 0));
  border-bottom-color: var(--cyan);
}
.nav__link:hover .nav__idx { color: var(--cyan); }
.nav__link[aria-current="page"] {
  color: var(--white);
  border-bottom-color: var(--orange);
  background: linear-gradient(180deg, rgba(0, 229, 255, .12), rgba(0, 229, 255, 0));
}
.nav__link[aria-current="page"] .nav__idx { color: var(--orange); }

/* 移动导航按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
  width: 48px; height: 48px;
  margin-left: auto;
  border: 1px solid var(--line-cyan);
  border-radius: var(--radius);
  background: rgba(18, 48, 94, .6);
}
.nav-toggle__bar {
  display: block;
  width: 20px; height: 2px;
  background: var(--cyan);
  transition: transform var(--dur) var(--ease), opacity .18s linear;
}

@media (max-width: 1023px) {
  .header-bar__inner { gap: 12px; min-height: 68px; }
  .nav-toggle { display: inline-flex; }

  .site-header[data-open="true"] .nav-toggle__bar:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .site-header[data-open="true"] .nav-toggle__bar:nth-child(2) { opacity: 0; }
  .site-header[data-open="true"] .nav-toggle__bar:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

  .nav {
    position: fixed;
    top: 0; right: 0; bottom: 0;
    width: min(86vw, 360px);
    margin: 0;
    padding: 96px 22px 32px;
    overflow-y: auto;
    background: linear-gradient(180deg, var(--ink-0), var(--ink-1));
    border-left: 1px solid var(--line-cyan);
    box-shadow: -18px 0 40px rgba(4, 12, 27, .7);
    transform: translateX(102%);
    opacity: 0;
    visibility: hidden;
    z-index: 64;
    transition: transform .3s var(--ease), opacity .3s var(--ease), visibility .3s linear;
  }
  .site-header[data-open="true"] .nav {
    transform: none;
    opacity: 1;
    visibility: visible;
  }
  .nav__list { flex-direction: column; gap: 4px; }
  .nav__link {
    flex-direction: row;
    align-items: center;
    gap: 14px;
    min-height: 56px;
    padding: 12px 10px;
    border-bottom: 1px solid var(--line);
    border-left: 2px solid transparent;
  }
  .nav__link:hover {
    background: rgba(0, 229, 255, .06);
    border-bottom-color: var(--line);
    border-left-color: var(--cyan);
  }
  .nav__link[aria-current="page"] {
    border-bottom-color: var(--line);
    border-left-color: var(--orange);
    background: linear-gradient(90deg, rgba(255, 107, 53, .16), transparent);
  }
}

@media (max-width: 767px) {
  .header-top__brand,
  .header-quick__link:last-child { display: none; }
  .header-top__inner { justify-content: space-between; }
  .header-top__coords { font-size: .625rem; letter-spacing: .1em; }
}

/* ---------- 9. 通用按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 44px;
  padding: 12px 22px;
  border: 1px solid var(--line-cyan);
  border-radius: var(--radius);
  background: rgba(18, 48, 94, .5);
  color: var(--cyan-soft);
  font-family: var(--font-data);
  font-size: .75rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.btn:hover { background: var(--cyan); color: var(--ink-0); border-color: var(--cyan); }
.btn--primary {
  background: linear-gradient(135deg, var(--orange), #FF9A3C);
  border-color: transparent;
  color: #26100A;
  font-weight: 700;
}
.btn--primary:hover { background: var(--amber); color: #26100A; border-color: transparent; }
.btn--ghost {
  background: transparent;
  border-color: var(--line-strong);
  color: var(--white);
}
.btn--ghost:hover { background: rgba(0, 229, 255, .1); border-color: var(--cyan); color: var(--white); }

/* ---------- 10. 面包屑与正文容器 ---------- */
.breadcrumb {
  font-family: var(--font-data);
  font-size: .6875rem;
  letter-spacing: .14em;
  color: var(--graphite);
}
.breadcrumb__list { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; }
.breadcrumb__item { display: inline-flex; align-items: center; }
.breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  margin-right: 10px;
  color: rgba(166, 178, 194, .45);
}
.breadcrumb a { display: inline-flex; align-items: center; min-height: 44px; }
.breadcrumb a:hover { color: var(--cyan); }
.breadcrumb [aria-current="page"] { color: var(--white); }

.content-body {
  max-width: 72ch;
  color: var(--text-dim);
  font-size: 1.0625rem;
  line-height: 1.75;
}
.content-body > * + * { margin-top: 1.05em; }
.content-body h3 { margin-top: 1.6em; }
.content-body a { color: var(--cyan); border-bottom: 1px solid var(--line-cyan); }
.content-body a:hover { color: var(--cyan-soft); }
.content-body ul { display: grid; gap: .5em; }
.content-body li { padding-left: 1.15em; position: relative; }
.content-body li::before {
  content: "";
  position: absolute;
  left: 0; top: .72em;
  width: 6px; height: 1px;
  background: var(--orange);
}

/* ---------- 11. 容器、图片、数据组件 ---------- */
.panel {
  position: relative;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(160deg, rgba(18, 48, 94, .85), rgba(6, 19, 43, .92));
  box-shadow: var(--inner-top);
}
.panel--accent {
  border-color: var(--line-orange);
  background: linear-gradient(160deg, rgba(255, 107, 53, .14), rgba(6, 19, 43, .92));
}

.media {
  position: relative;
  display: block;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(135deg, var(--ink-2), var(--ink-0));
}
.media img { width: 100%; height: 100%; object-fit: cover; }
.media--21x9 { aspect-ratio: 21 / 9; }
.media--16x9 { aspect-ratio: 16 / 9; }
.media--4x3  { aspect-ratio: 4 / 3; }
.media--1x1  { aspect-ratio: 1 / 1; }
.media__tint {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(115deg, rgba(0, 229, 255, .10), rgba(6, 19, 43, .72) 78%);
}
.media__cap {
  position: absolute;
  left: 12px; bottom: 10px;
  font-family: var(--font-data);
  font-size: .625rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, .82);
}

.stat {
  font-family: var(--font-data);
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  line-height: 1.1;
  letter-spacing: .02em;
  color: var(--white);
}
.stat__unit {
  display: block;
  margin-top: 6px;
  font-family: var(--font-data);
  font-size: .8125rem;
  letter-spacing: .12em;
  color: var(--cyan);
}

.tag {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 4px 10px;
  border: 1px solid var(--line-cyan);
  border-radius: var(--radius);
  font-family: var(--font-data);
  font-size: .6875rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--cyan-soft);
}
.tag--hot { border-color: var(--line-orange); color: var(--orange); }
.tag--gold { border-color: rgba(255, 179, 71, .5); color: var(--amber); }

/* ---------- 12. 分段切换 ---------- */
.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 22px;
  border-bottom: 1px solid var(--line);
}
.tab {
  min-height: 44px;
  padding: 10px 18px;
  border: 1px solid transparent;
  border-bottom: 2px solid transparent;
  border-radius: var(--radius) var(--radius) 0 0;
  font-family: var(--font-head);
  font-size: .9375rem;
  font-weight: 600;
  letter-spacing: .08em;
  color: rgba(232, 238, 247, .7);
  transition: color var(--dur) var(--ease), background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.tab:hover { color: var(--white); background: rgba(0, 229, 255, .07); }
.tab[aria-selected="true"] {
  color: var(--white);
  border-bottom-color: var(--orange);
  background: linear-gradient(180deg, rgba(255, 107, 53, .16), transparent);
}
.tabpanel { display: none; }
.tabpanel.is-active { display: block; }

/* ---------- 13. 显现与返回顶部 ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity .32s var(--ease), transform .32s var(--ease);
}
[data-reveal].is-visible { opacity: 1; transform: none; }

.to-top {
  position: fixed;
  right: 20px; bottom: 20px;
  z-index: 70;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px; height: 48px;
  border: 1px solid var(--line-cyan);
  border-radius: var(--radius);
  background: rgba(6, 19, 43, .88);
  color: var(--cyan);
  font-family: var(--font-data);
  font-size: .625rem;
  letter-spacing: .1em;
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease), visibility var(--dur) linear;
}
.to-top.is-visible { opacity: 1; visibility: visible; transform: none; }
.to-top:hover { background: var(--cyan); color: var(--ink-0); }

/* ---------- 14. 页脚 ---------- */
.site-footer {
  margin-top: clamp(56px, 8vw, 96px);
  background: linear-gradient(180deg, var(--ink-0), #040C1B);
  border-top: 1px solid var(--line-cyan);
  color: var(--text-dim);
}
.site-footer::before {
  content: "";
  display: block;
  height: 8px;
  background-image: repeating-linear-gradient(to right,
    rgba(0, 229, 255, .42) 0 1px, transparent 1px 48px);
  opacity: .85;
}
.footer-main { padding: clamp(40px, 6vw, 64px) 0 32px; }

.footer-grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: 32px 24px;
}
.footer-brand { grid-column: span 4; }
.brand--footer { margin-bottom: 18px; }
.footer-signoff {
  font-family: var(--font-head);
  font-size: clamp(1.4rem, 3.2vw, 2.1rem);
  font-weight: 700;
  line-height: 1.14;
  letter-spacing: .02em;
  color: rgba(255, 255, 255, .92);
  max-width: 20ch;
}
.footer-note {
  margin-top: 14px;
  font-family: var(--font-data);
  font-size: .6875rem;
  letter-spacing: .14em;
  color: var(--graphite);
}
.footer-cols {
  grid-column: span 8;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 20px;
}
.footer-col__title {
  margin-bottom: 8px;
  font-family: var(--font-data);
  font-size: .6875rem;
  font-weight: 500;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--cyan);
}
.footer-col__list { display: grid; gap: 2px; }
.footer-col__list a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  color: var(--text-dim);
  font-size: .9375rem;
  transition: color var(--dur) var(--ease);
}
.footer-col__list a:hover { color: var(--cyan-soft); }

.footer-contact {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 20px 24px;
  margin-top: 40px;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(150deg, rgba(18, 48, 94, .45), rgba(6, 19, 43, .6));
  box-shadow: var(--inner-top);
}
.footer-contact__item { display: grid; gap: 6px; }
.footer-contact__value {
  font-family: var(--font-data);
  font-size: .8125rem;
  line-height: 1.6;
  color: var(--white);
  word-break: break-word;
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 20px;
  padding: 16px 0 26px;
  border-top: 1px solid var(--line);
  font-family: var(--font-data);
  font-size: .6875rem;
  letter-spacing: .12em;
  color: var(--graphite);
}
.footer-bottom__links { display: flex; flex-wrap: wrap; gap: 4px 18px; }
.footer-bottom__links a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  color: var(--graphite);
  transition: color var(--dur) var(--ease);
}
.footer-bottom__links a:hover { color: var(--cyan); }

/* ---------- 15. 响应式 ---------- */
@media (max-width: 1279px) {
  :root { --pad-x: 20px; }
  .grid { grid-template-columns: repeat(8, minmax(0, 1fr)); gap: 20px; }
  .u-span-4, .u-span-5, .u-span-6, .u-span-7, .u-span-8 { grid-column: span 4; }
  .u-span-12 { grid-column: span 8; }

  .header-bar__inner { gap: 12px; }
  .nav__link { padding: 10px 11px; }
  .nav__label { font-size: .875rem; }

  .footer-brand { grid-column: span 8; }
  .footer-cols { grid-column: span 8; grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 767px) {
  :root { --pad-x: 16px; }
  .grid { grid-template-columns: 1fr; gap: 16px; }
  .u-span-4, .u-span-5, .u-span-6, .u-span-7, .u-span-8, .u-span-12 { grid-column: span 1; }

  .section { padding: 44px 0; }
  .section__head { margin-bottom: 20px; }
  .brand__mark { width: 36px; height: 36px; }
  .brand__name { font-size: 1.0625rem; letter-spacing: .06em; }
  .brand__sub { letter-spacing: .18em; }

  .footer-cols { grid-template-columns: 1fr 1fr; gap: 12px 18px; }
  .footer-contact { padding: 20px; margin-top: 28px; }
  .footer-bottom { padding-bottom: 22px; }
  .to-top { right: 12px; bottom: 12px; }
}

/* ---------- 16. 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }
  [data-reveal] { opacity: 1; transform: none; }
  .scroll-progress { transition: none; }
}