/* ==========================================================================
   AOA体育 · 英格兰数据切片
   共享层 /assets/site.css —— reset / tokens / 排版 / 头部窄栏 / 页脚 / 通用件
   ========================================================================== */

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

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

body, h1, h2, h3, h4, h5, p, ol, ul, li, figure, figcaption, blockquote, dl, dd { margin: 0; }

ol, ul { list-style: none; padding: 0; }

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

a { color: inherit; text-decoration: none; }

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

button { background: none; border: 0; cursor: pointer; }

table { border-collapse: collapse; width: 100%; }

address { font-style: normal; }

hr { border: 0; }

/* ---------- 2. 设计变量 ---------- */
:root {
  /* 色彩：夜场墨黑 / 深草皮绿 / 中绿台面 / 边线青灰 */
  --ink: #080D0B;
  --turf: #0F2A21;
  --turf-deep: #0B1F18;
  --table: #164034;
  --line: #2E5C4E;
  /* 数据与提示 */
  --cyan: #35F0CE;
  --cyan-soft: #A6F5E4;
  --amber: #F0B429;
  --red: #E23E3A;
  /* 文字 */
  --ivory: #F2F6F4;
  --mute: #7E9A90;
  --shade: #04100C;

  --line-soft: rgba(46, 92, 78, 0.55);
  --line-hair: rgba(46, 92, 78, 0.28);
  --cyan-wash: rgba(53, 240, 206, 0.09);
  --amber-wash: rgba(240, 180, 41, 0.12);
  --red-wash: rgba(226, 62, 58, 0.12);

  /* 字体 */
  --font-cn: "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-en: "Archivo Narrow", "Oswald", "Arial Narrow", "Source Han Sans SC", "Noto Sans SC", sans-serif;
  --font-mono: ui-monospace, "JetBrains Mono", "Roboto Mono", "SFMono-Regular", Menlo, Consolas, monospace;

  /* 字阶 12 / 14 / 16 / 20 / 28 / 44 / 72 / 96 */
  --fs-12: 12px;
  --fs-14: 14px;
  --fs-16: 16px;
  --fs-20: 20px;
  --fs-28: 28px;
  --fs-44: 44px;
  --fs-72: 72px;
  --fs-96: 96px;

  /* 尺度 */
  --rail-w: 260px;
  --rail-bar: 58px;
  --container: 1240px;
  --gutter: clamp(20px, 4vw, 56px);
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

/* ---------- 3. 基础排版 ---------- */
body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  background-color: var(--ink);
  background-image:
    linear-gradient(90deg, rgba(46, 92, 78, 0.12) 0 1px, transparent 1px 100%),
    linear-gradient(0deg, rgba(46, 92, 78, 0.08) 0 1px, transparent 1px 100%);
  background-size: 120px 120px, 120px 120px;
  color: var(--ivory);
  font-family: var(--font-cn);
  font-size: var(--fs-16);
  font-weight: 400;
  line-height: 1.75;
  letter-spacing: 0.01em;
}

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

:focus-visible { outline: 2px solid var(--cyan); outline-offset: 2px; }

#main-content {
  flex: 1 0 auto;
  display: block;
  scroll-margin-top: var(--rail-bar);
}

/* 跳转链接 */
.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 200;
  padding: 10px 16px;
  background: var(--cyan);
  color: var(--ink);
  font-size: var(--fs-14);
  font-weight: 700;
  letter-spacing: 0.04em;
  transform: translateY(-180%);
  transition: transform 0.2s ease-out;
}
.skip-link:focus { transform: translateY(0); }

/* ---------- 4. 通用排版件 ---------- */
.display {
  font-size: clamp(32px, 5.4vw, var(--fs-72));
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -0.02em;
}

.section-title {
  font-size: clamp(24px, 3.1vw, var(--fs-44));
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -0.02em;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-en);
  font-size: var(--fs-12);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan);
}
.eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  background: var(--cyan);
}

.lede {
  font-size: var(--fs-20);
  line-height: 1.65;
  color: var(--cyan-soft);
}

.measure { max-width: 62ch; }

.meta-line {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.06em;
  color: var(--mute);
}

.num-figure {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(40px, 7vw, var(--fs-96));
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.unit {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.08em;
  color: var(--mute);
}

/* 分类与风险标签 */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 8px;
  border: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.08em;
  color: var(--cyan-soft);
  white-space: nowrap;
}
.tag-amber {
  color: var(--amber);
  border-color: rgba(240, 180, 41, 0.5);
  background: var(--amber-wash);
}
.tag-red {
  color: var(--red);
  border-color: rgba(226, 62, 58, 0.5);
  background: var(--red-wash);
}

/* ---------- 5. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 20px;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--ivory);
  font-size: var(--fs-14);
  font-weight: 700;
  letter-spacing: 0.04em;
  line-height: 1.2;
  text-align: center;
  transition: background-color 0.16s ease-out, color 0.16s ease-out, border-color 0.16s ease-out;
}
.btn:hover,
.btn:focus-visible {
  background: var(--table);
  border-color: var(--cyan);
  color: var(--cyan-soft);
}

.btn-accent {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--ink);
}
.btn-accent:hover,
.btn-accent:focus-visible {
  background: var(--cyan-soft);
  border-color: var(--cyan-soft);
  color: var(--ink);
}

.btn-ghost {
  border-color: var(--line-soft);
  color: var(--cyan-soft);
}

/* ---------- 6. 容器与区块 ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section { padding-block: clamp(40px, 6vw, 88px); }

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px 24px;
  margin-bottom: 28px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line-soft);
}

.slant {
  position: relative;
  height: clamp(48px, 7vw, 96px);
  overflow: hidden;
}
.slant::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--turf) 0%, var(--turf-deep) 100%);
  clip-path: polygon(0 100%, 100% 0, 100% 100%);
  border-top: 1px solid var(--line-hair);
}

/* ---------- 7. 资料卡 ---------- */
.panel {
  position: relative;
  background: var(--table);
  border: 1px solid var(--line);
}
.panel::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--cyan);
  opacity: 0.4;
}
.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 18px;
  border-bottom: 1px solid var(--line-soft);
  font-size: var(--fs-14);
  font-weight: 700;
  letter-spacing: 0.04em;
}
.panel-body { padding: 18px; }

/* ---------- 8. 面包屑 ---------- */
.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.04em;
  color: var(--mute);
}
.crumb { color: var(--mute); transition: color 0.16s ease-out; }
.crumb:hover,
.crumb:focus-visible { color: var(--cyan); }
.crumb[aria-current="page"] { color: var(--cyan-soft); }
.crumb-sep { color: var(--line); }

/* ---------- 9. 图片容器（页面阶段放图） ---------- */
.media-frame {
  position: relative;
  display: block;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(22, 64, 52, 0.9) 0%, rgba(8, 13, 11, 0.96) 100%);
}
.media-frame > img,
.media-frame > picture > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.media-frame::before {
  content: "";
  position: absolute;
  top: -42px;
  right: -42px;
  width: 124px;
  height: 124px;
  border: 1px solid rgba(53, 240, 206, 0.45);
  border-radius: 50%;
  pointer-events: none;
}
.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(90deg, rgba(53, 240, 206, 0.14) 0 1px, transparent 1px 100%),
    linear-gradient(0deg, rgba(46, 92, 78, 0.3) 0 1px, transparent 1px 100%);
  background-size: 64px 100%, 100% 64px;
}
.media-frame[data-ratio="21x9"] { aspect-ratio: 21 / 9; }
.media-frame[data-ratio="16x9"] { aspect-ratio: 16 / 9; }
.media-frame[data-ratio="4x3"] { aspect-ratio: 4 / 3; }
.media-frame[data-ratio="1x1"] { aspect-ratio: 1 / 1; }
.media-frame[data-ratio="3x4"] { aspect-ratio: 3 / 4; }

.media-slot {
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 12px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.08em;
  color: var(--cyan-soft);
}

.media-caption {
  margin-top: 8px;
  font-size: var(--fs-12);
  line-height: 1.7;
  color: var(--mute);
}

/* ---------- 10. 显现 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.6s var(--ease), transform 0.6s var(--ease);
}
.reveal.is-visible {
  opacity: 1;
  transform: none;
}

/* ---------- 11. 左侧窄栏（共享头部） ---------- */
.site-rail {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: var(--rail-w);
  z-index: 80;
  display: flex;
  overflow: hidden;
  background: linear-gradient(180deg, #0F2A21 0%, #0B1F18 46%, #080D0B 100%);
  border-right: 1px solid var(--line);
}
.site-rail::after {
  content: "";
  position: absolute;
  left: -74px;
  bottom: -74px;
  width: 210px;
  height: 210px;
  border: 1px solid var(--line-soft);
  border-radius: 50%;
  pointer-events: none;
}

.rail-progress {
  position: absolute;
  top: 0;
  right: 0;
  width: 2px;
  height: 100%;
  background: var(--cyan);
  transform-origin: top center;
  transform: scaleY(var(--p, 0));
  pointer-events: none;
  z-index: 3;
}

.rail-inner {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 18px;
  width: 100%;
  padding: 26px 20px 20px;
}

.rail-brand {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.brand-lock {
  display: flex;
  flex-direction: column;
  gap: 6px;
  color: var(--ivory);
}
.brand-mark {
  font-size: var(--fs-28);
  font-weight: 900;
  line-height: 1;
  letter-spacing: -0.02em;
  transition: color 0.16s ease-out;
}
.brand-sub {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.16em;
  color: var(--cyan);
}
.brand-lock:hover .brand-mark,
.brand-lock:focus-visible .brand-mark { color: var(--cyan-soft); }

.rail-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  border: 1px solid var(--line);
  color: var(--cyan-soft);
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.1em;
}
.rail-toggle-bars {
  position: relative;
  display: block;
  width: 18px;
  height: 2px;
  background: currentColor;
}
.rail-toggle-bars::before,
.rail-toggle-bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  background: currentColor;
  transition: transform 0.2s ease-out;
}
.rail-toggle-bars::before { top: -6px; }
.rail-toggle-bars::after { top: 6px; }
.rail-toggle[aria-expanded="true"] .rail-toggle-bars { background: transparent; }
.rail-toggle[aria-expanded="true"] .rail-toggle-bars::before { transform: translateY(6px) rotate(45deg); }
.rail-toggle[aria-expanded="true"] .rail-toggle-bars::after { transform: translateY(-6px) rotate(-45deg); }
.rail-toggle-text { white-space: nowrap; }

.rail-body {
  display: flex;
  flex: 1 1 auto;
  flex-direction: column;
  gap: 18px;
  min-height: 0;
}

.rail-nav { flex: 0 0 auto; }

.rail-nav-title {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 6px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line-soft);
  font-family: var(--font-en);
  font-size: var(--fs-12);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--mute);
}
.rail-nav-code {
  font-family: var(--font-mono);
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.rail-list { display: flex; flex-direction: column; }
.rail-item { position: relative; }

.rail-link {
  position: relative;
  display: grid;
  grid-template-columns: 26px 1fr;
  align-items: baseline;
  gap: 6px;
  padding: 11px 8px;
  border-bottom: 1px solid var(--line-hair);
  color: var(--ivory);
  font-size: var(--fs-14);
  transition: transform 0.16s ease-out, color 0.16s ease-out, background-color 0.16s ease-out;
}
.rail-link::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  bottom: 9px;
  width: 4px;
  background: var(--cyan);
  opacity: 0;
  transform: scaleY(0.35);
  transition: opacity 0.16s ease-out, transform 0.16s ease-out;
}
.rail-num {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  color: var(--mute);
}
.rail-label { font-weight: 500; letter-spacing: 0.02em; }

.rail-link:hover,
.rail-link:focus-visible {
  color: var(--cyan-soft);
  transform: translateX(4px);
}
.rail-link:hover::before,
.rail-link:focus-visible::before {
  opacity: 1;
  transform: scaleY(1);
}
.rail-link[aria-current="page"] {
  color: var(--cyan);
  background: var(--cyan-wash);
}
.rail-link[aria-current="page"]::before {
  opacity: 1;
  transform: scaleY(1);
}
.rail-link[aria-current="page"] .rail-num { color: var(--cyan); }

.rail-utility {
  margin-top: auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding-top: 16px;
  border-top: 1px solid var(--line-soft);
}

.season-switch { display: flex; flex-direction: column; gap: 8px; }
.season-title {
  font-family: var(--font-en);
  font-size: var(--fs-12);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--mute);
}
.season-track {
  display: flex;
  gap: 1px;
  background: var(--line-hair);
}
.season-btn {
  flex: 1 1 0;
  padding: 8px 4px;
  background: var(--ink);
  color: var(--mute);
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.04em;
  transition: color 0.16s ease-out, background-color 0.16s ease-out, box-shadow 0.16s ease-out;
}
.season-btn:hover,
.season-btn:focus-visible { color: var(--cyan-soft); background: var(--turf); }
.season-btn.is-active {
  background: var(--cyan-wash);
  color: var(--cyan);
  box-shadow: inset 0 -2px 0 var(--cyan);
}
.season-value {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  color: var(--mute);
}

.rail-cta { width: 100%; }

.rail-lang {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.18em;
  color: var(--mute);
}

.rail-note {
  padding-left: 8px;
  border-left: 2px solid var(--amber);
  font-size: var(--fs-12);
  line-height: 1.7;
  color: var(--mute);
}

/* ---------- 12. 页脚 ---------- */
.site-footer {
  position: relative;
  padding-block: clamp(36px, 5vw, 64px) 28px;
  background: linear-gradient(180deg, var(--turf) 0%, var(--ink) 46%);
  border-top: 1px solid var(--line);
  color: var(--ivory);
}
.site-footer::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: min(320px, 42%);
  height: 2px;
  background: var(--cyan);
}

.foot-inner {
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.foot-top {
  display: grid;
  grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  align-items: end;
  gap: 24px 40px;
  padding-bottom: 28px;
  border-bottom: 1px solid var(--line-soft);
}

.foot-brand { display: flex; flex-direction: column; gap: 6px; }
.foot-mark {
  font-size: clamp(24px, 3vw, 36px);
  font-weight: 900;
  line-height: 1;
  letter-spacing: -0.02em;
}
.foot-tagline {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--mute);
}
.foot-closing {
  max-width: 52ch;
  font-size: var(--fs-14);
  line-height: 1.8;
  color: var(--cyan-soft);
}

.foot-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  margin-top: 32px;
  background: var(--line-hair);
  border-block: 1px solid var(--line-hair);
}

.foot-col {
  padding: 20px 18px 22px;
  background: var(--ink);
}

.foot-col-title {
  margin-bottom: 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line-hair);
  font-family: var(--font-en);
  font-size: var(--fs-12);
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--mute);
}
.foot-col-title::before {
  content: "";
  display: inline-block;
  width: 10px;
  height: 2px;
  margin-right: 8px;
  vertical-align: middle;
  background: var(--cyan);
}

.foot-links { display: flex; flex-direction: column; }

.foot-link {
  position: relative;
  display: inline-block;
  padding: 5px 0;
  color: var(--mute);
  font-size: var(--fs-14);
  transition: color 0.16s ease-out, transform 0.16s ease-out;
}
.foot-link::before {
  content: "";
  position: absolute;
  left: -10px;
  top: 50%;
  width: 4px;
  height: 4px;
  background: var(--cyan);
  transform: translateY(-50%) scale(0);
  transition: transform 0.16s ease-out;
}
.foot-link:hover,
.foot-link:focus-visible { color: var(--cyan-soft); transform: translateX(6px); }
.foot-link:hover::before,
.foot-link:focus-visible::before { transform: translateY(-50%) scale(1); }

.foot-col-contact { background: linear-gradient(180deg, rgba(22, 64, 52, 0.55) 0%, var(--ink) 100%); }

.foot-contact-line {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  line-height: 1.9;
  letter-spacing: 0.02em;
  color: var(--mute);
  word-break: break-word;
}

.copy-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 12px;
  padding: 8px 14px;
  border: 1px solid var(--line);
  color: var(--cyan-soft);
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.08em;
  transition: color 0.16s ease-out, border-color 0.16s ease-out, background-color 0.16s ease-out;
}
.copy-btn:hover,
.copy-btn:focus-visible { border-color: var(--cyan); color: var(--cyan); }
.copy-btn[data-copied="true"] {
  border-color: var(--cyan);
  background: var(--cyan-wash);
  color: var(--cyan);
}
.copy-btn[data-copied="false"] {
  border-color: var(--amber);
  background: var(--amber-wash);
  color: var(--amber);
}

.foot-bottom {
  display: grid;
  gap: 10px;
  margin-top: 28px;
  padding-top: 20px;
  border-top: 1px solid var(--line-soft);
}
.foot-bottom .foot-contact-line { margin-top: 0; }
.foot-legal,
.foot-year {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  line-height: 1.9;
  letter-spacing: 0.03em;
  color: var(--mute);
}

/* ---------- 13. 断点：桌面偏移 ---------- */
@media (min-width: 1024px) {
  body { padding-left: var(--rail-w); }
}

/* ---------- 14. 断点：平板与手机 ---------- */
@media (max-width: 1023px) {
  body { padding-top: var(--rail-bar); }

  .site-rail {
    top: 0;
    left: 0;
    right: 0;
    bottom: auto;
    width: auto;
    height: var(--rail-bar);
    overflow: visible;
    border-right: 0;
    border-bottom: 1px solid var(--line);
    background: linear-gradient(90deg, #0F2A21 0%, #0B1F18 58%, #080D0B 100%);
  }
  .site-rail::after { display: none; }

  .rail-progress {
    top: auto;
    bottom: -1px;
    left: 0;
    right: 0;
    width: auto;
    height: 2px;
    transform-origin: left center;
    transform: scaleX(var(--p, 0));
  }

  .rail-inner {
    height: var(--rail-bar);
    padding: 0 16px;
    flex-direction: row;
    align-items: center;
    gap: 12px;
  }

  .rail-brand {
    flex: 1 1 auto;
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
  }
  .brand-lock { flex-direction: row; align-items: baseline; gap: 10px; }
  .brand-mark { font-size: var(--fs-20); }
  .brand-sub { font-size: 10px; letter-spacing: 0.1em; }

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

  .rail-body {
    display: none;
    position: absolute;
    top: var(--rail-bar);
    left: 0;
    right: 0;
    max-height: calc(100vh - var(--rail-bar));
    overflow-y: auto;
    overscroll-behavior: contain;
    padding: 18px 16px 24px;
    border-bottom: 1px solid var(--line);
    background: linear-gradient(180deg, #0B1F18 0%, #080D0B 100%);
    box-shadow: 0 26px 50px var(--shade);
  }
  .site-rail[data-open] .rail-body {
    display: flex;
    flex-direction: column;
    animation: rail-drop 0.24s ease-out both;
  }

  .rail-list {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 14px;
  }
  .rail-link { padding: 12px 8px; }
  .rail-utility { margin-top: 4px; }

  .foot-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@keyframes rail-drop {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: none; }
}

@media (max-width: 900px) {
  .foot-top { grid-template-columns: minmax(0, 1fr); align-items: start; }
}

@media (max-width: 560px) {
  .foot-grid { grid-template-columns: minmax(0, 1fr); }
  .rail-list { grid-template-columns: minmax(0, 1fr); }
  .foot-col { padding: 18px 14px 20px; }
}

/* ---------- 15. 无障碍与打印 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
  .reveal { opacity: 1; transform: none; }
}