/* ===========================================================
   球速赛场 / assets/site.css
   共享层：reset、令牌、头部框架导航、页脚、按钮、栅格、通用组件
   =========================================================== */

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

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

body,
h1, h2, h3, h4, h5, h6,
p, ul, ol, li, figure, blockquote, dl, dd {
  margin: 0;
  padding: 0;
}

ul, ol { list-style: none; }

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

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  cursor: pointer;
}

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

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

h1, h2, h3, h4 { font-weight: 600; }

/* ---------- 2. 设计令牌 ---------- */
:root {
  --ink: #070C1A;
  --navy: #0E1730;
  --steel: #16244A;
  --cyan: #2BE7D6;
  --cyan-soft: #7CF3E6;
  --hot: #FF5A2B;
  --gold: #FFC24B;
  --violet: #6C5CE7;
  --paper: #F2F5FA;
  --paper-2: #E8ECF4;
  --mist: #9FB0CC;
  --alert: #E5484D;

  --line: rgba(43, 231, 214, 0.26);
  --line-strong: rgba(43, 231, 214, 0.5);
  --line-soft: rgba(159, 176, 204, 0.26);

  --rail: 264px;

  --font-display: "Barlow Condensed", "Oswald", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-editorial: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "SimSun", serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --font-data: "JetBrains Mono", "Roboto Mono", ui-monospace, "SFMono-Regular", Consolas, monospace;

  --s1: 12px; --s2: 16px; --s3: 18px; --s4: 24px;
  --s5: 32px; --s6: 42px; --s7: 56px; --s8: 76px; --s9: 96px;

  --radius: 3px;
  --shadow-card: 0 22px 44px -32px rgba(0, 0, 0, 0.95);
}

/* ---------- 3. 基础排版与页面底 ---------- */
body {
  padding-left: var(--rail);
  min-height: 100vh;
  background-color: var(--ink);
  background-image:
    repeating-linear-gradient(-6deg, rgba(43, 231, 214, 0.045) 0 1px, transparent 1px 22px),
    radial-gradient(120% 78% at 88% -12%, rgba(108, 92, 231, 0.3), transparent 62%),
    radial-gradient(96% 62% at -6% 104%, rgba(43, 231, 214, 0.12), transparent 66%);
  background-attachment: fixed;
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.75;
  letter-spacing: 0.005em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

::selection { background: var(--hot); color: #070C1A; }

:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 2px;
}

/* ---------- 4. 通用容器与栅格 ---------- */
.u-container {
  width: 100%;
  max-width: 1160px;
  margin-inline: auto;
  padding-inline: clamp(20px, 4vw, 56px);
}

.grid { display: grid; gap: clamp(16px, 2.4vw, 32px); grid-template-columns: 1fr; }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--4-8 { grid-template-columns: 4fr 8fr; }
.grid--5-7 { grid-template-columns: 5fr 7fr; }
.grid--3-9 { grid-template-columns: 3fr 9fr; }

@media (max-width: 900px) {
  .grid--2,
  .grid--3,
  .grid--4-8,
  .grid--5-7,
  .grid--3-9 { grid-template-columns: 1fr; }
}

/* ---------- 5. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5em;
  padding: 0.72em 1.15em;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: 0.02em;
  text-align: center;
  transition: background-color 0.22s ease, color 0.22s ease, border-color 0.22s ease, transform 0.22s ease;
}

.btn--hot {
  background: var(--hot);
  border-color: var(--hot);
  color: var(--ink);
}

.btn--hot:hover {
  background: #ff7248;
  border-color: #ff7248;
  transform: translateY(-2px);
}

.btn--ghost {
  border-color: var(--line-strong);
  color: var(--cyan);
  background: rgba(43, 231, 214, 0.05);
}

.btn--ghost:hover {
  background: rgba(43, 231, 214, 0.14);
  color: var(--cyan-soft);
  transform: translateY(-2px);
}

.btn--line {
  border-color: rgba(159, 176, 204, 0.42);
  color: var(--mist);
  background: transparent;
}

.btn--line:hover {
  border-color: var(--cyan);
  color: var(--cyan);
  background: rgba(43, 231, 214, 0.08);
}

/* ---------- 6. 品牌 ---------- */
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
  color: var(--paper);
}

.brand__mark {
  flex: 0 0 auto;
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: radial-gradient(circle at 30% 20%, rgba(43, 231, 214, 0.2), transparent 72%);
  box-shadow: inset 2px 2px 0 rgba(22, 36, 74, 0.9);
}

.brand__mark svg { width: 28px; height: 28px; }

.brand__text { display: flex; flex-direction: column; gap: 1px; min-width: 0; }

.brand__name {
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 900;
  font-size: 22px;
  line-height: 1.06;
  letter-spacing: 0.01em;
  white-space: nowrap;
}

.brand__tag {
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--mist);
  white-space: nowrap;
}

/* ---------- 7. 头部框架导航 ---------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  z-index: 70;
  display: flex;
  flex-direction: column;
  gap: var(--s4);
  width: var(--rail);
  padding: 22px 18px 18px;
  overflow-y: auto;
  background: linear-gradient(180deg, #0E1730 0%, #0A1226 55%, #070C1A 100%);
  border-right: 1px solid var(--line);
  box-shadow: inset -2px 0 0 var(--steel), 18px 0 46px -34px rgba(43, 231, 214, 0.7);
}

.skip-link {
  position: absolute;
  left: 12px;
  top: 12px;
  z-index: 200;
  padding: 10px 16px;
  border-radius: var(--radius);
  background: var(--cyan);
  color: var(--ink);
  font-size: 14px;
  font-weight: 600;
  transform: translateY(-180%);
  transition: transform 0.2s ease;
}

.skip-link:focus { transform: translateY(0); }

.masthead {
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding-bottom: 18px;
  border-bottom: 1px dashed var(--line-soft);
}

.masthead__actions {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.nav-toggle { display: none; }

.rail {
  display: flex;
  flex: 1 1 auto;
  flex-direction: column;
  gap: 14px;
  min-height: 0;
}

.rail__handle { display: none; }

.rail__kicker {
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--mist);
}

.rail__list { display: flex; flex-direction: column; gap: 2px; }

.rail__link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 12px;
  border-left: 2px solid transparent;
  border-radius: 0 var(--radius) var(--radius) 0;
  color: var(--mist);
  font-size: 16px;
  line-height: 1.4;
  transition: color 0.2s ease, background-color 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}

.rail__link:hover {
  color: var(--cyan-soft);
  background: rgba(43, 231, 214, 0.07);
  border-left-color: var(--line-strong);
  transform: translateX(2px);
}

.rail__link[aria-current="page"] {
  color: var(--paper);
  background: linear-gradient(90deg, rgba(43, 231, 214, 0.18), rgba(43, 231, 214, 0));
  border-left-color: var(--cyan);
}

.rail__num {
  min-width: 20px;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: rgba(159, 176, 204, 0.62);
}

.rail__link[aria-current="page"] .rail__num { color: var(--hot); }

.rail__foot {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: auto;
  padding-top: 16px;
  border-top: 1px dashed var(--line-soft);
}

.rail__stamp {
  font-family: var(--font-data);
  font-size: 11.5px;
  letter-spacing: 0.04em;
  color: var(--mist);
}

/* ---------- 8. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(64px, 9vw, 120px);
  padding: clamp(40px, 5vw, 72px) clamp(20px, 4vw, 56px) 28px;
  background: linear-gradient(180deg, rgba(14, 23, 48, 0.9), rgba(7, 12, 26, 1));
  border-top: 1px solid var(--line);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 5px;
  background: repeating-linear-gradient(90deg, var(--cyan) 0 26px, transparent 26px 46px);
  opacity: 0.55;
}

.site-footer::after {
  content: "";
  position: absolute;
  inset: 0 0 0 auto;
  width: 40%;
  background: linear-gradient(200deg, rgba(108, 92, 231, 0.18), transparent 62%);
  pointer-events: none;
}

.site-footer__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(28px, 3.5vw, 48px);
  grid-template-columns: 1fr;
  max-width: 1160px;
  margin-inline: auto;
}

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

.footer-brand__meta {
  font-family: var(--font-data);
  font-size: 12.5px;
  line-height: 1.9;
  letter-spacing: 0.03em;
  color: var(--mist);
}

.footer-cols {
  display: grid;
  gap: 24px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.footer-col__title {
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(43, 231, 214, 0.22);
  font-family: var(--font-editorial);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--paper);
}

.footer-col__list { display: grid; gap: 9px; }

.footer-col__list a {
  display: inline-block;
  font-size: 15px;
  color: var(--mist);
  transition: color 0.2s ease, transform 0.2s ease;
}

.footer-col__list a:hover {
  color: var(--cyan);
  transform: translateX(3px);
}

.footer-contact {
  padding: 18px 18px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(22, 36, 74, 0.38);
  box-shadow: inset 2px 2px 0 rgba(22, 36, 74, 0.9);
}

.footer-contact__row { display: grid; gap: 2px; margin-bottom: 12px; }

.footer-contact__k {
  font-family: var(--font-data);
  font-size: 10.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: rgba(159, 176, 204, 0.85);
}

.footer-contact__v {
  font-size: 14.5px;
  line-height: 1.6;
  color: var(--paper);
  word-break: break-word;
}

.footer-contact__v--num { letter-spacing: 0.04em; }

.footer-contact__note {
  margin-top: 12px;
  padding-top: 10px;
  border-top: 1px dashed var(--line-soft);
  font-size: 13px;
  line-height: 1.65;
  color: var(--mist);
}

.footer-legal {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 20px;
  max-width: 1160px;
  margin: clamp(28px, 3vw, 48px) auto 0;
  padding-top: 18px;
  border-top: 1px solid var(--line-soft);
  font-size: 13px;
  color: var(--mist);
}

.footer-legal__icp { letter-spacing: 0.05em; }

.footer-legal__sign { font-size: 13px; color: rgba(159, 176, 204, 0.92); }

.footer-legal__spacer { flex: 1 1 40px; }

.footer-legal__copy { font-family: var(--font-data); font-size: 12.5px; letter-spacing: 0.04em; }

/* ---------- 9. 面包屑 / 正文 / 栏目件 ---------- */
.crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mist);
}

.crumbs a { color: var(--mist); transition: color 0.2s ease; }
.crumbs a:hover { color: var(--cyan); }
.crumbs__sep { color: rgba(159, 176, 204, 0.5); }
.crumbs [aria-current="page"] { color: var(--paper); }

.kicker {
  display: inline-block;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--cyan);
}

.lede {
  font-family: var(--font-editorial);
  font-size: clamp(18px, 2vw, 24px);
  font-weight: 600;
  line-height: 1.65;
  color: var(--paper);
}

.h-display {
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 900;
  line-height: 1.02;
  letter-spacing: -0.01em;
  text-transform: uppercase;
}

.h-display--xl { font-size: clamp(40px, 8vw, 96px); }

.data-num {
  font-family: var(--font-data);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.04em;
}

.prose {
  max-width: 34em;
  font-size: 17px;
  line-height: 1.75;
  color: #cdd7e8;
}

.prose > * + * { margin-top: 1.1em; }

.prose h2 {
  margin-top: 1.5em;
  font-family: var(--font-editorial);
  font-size: clamp(24px, 2.6vw, 32px);
  font-weight: 600;
  line-height: 1.35;
  color: var(--paper);
}

.prose h3 {
  margin-top: 1.3em;
  font-size: 19px;
  font-weight: 600;
  color: var(--paper);
}

.prose a {
  color: var(--cyan);
  border-bottom: 1px solid rgba(43, 231, 214, 0.42);
}

.prose a:hover { color: var(--cyan-soft); border-bottom-color: var(--cyan-soft); }

.prose strong { color: var(--paper); }

.prose ul { display: grid; gap: 0.5em; }

.prose li { position: relative; padding-left: 1.1em; }

.prose li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.74em;
  width: 9px;
  height: 2px;
  background: var(--cyan);
}

.prose blockquote {
  padding-left: 1em;
  border-left: 2px solid var(--cyan);
  font-family: var(--font-editorial);
  color: var(--paper);
}

.rule {
  height: 1px;
  border: 0;
  background: repeating-linear-gradient(90deg, rgba(43, 231, 214, 0.42) 0 14px, transparent 14px 24px);
}

.slash-divider {
  height: clamp(48px, 7vw, 96px);
  background:
    linear-gradient(180deg, rgba(22, 36, 74, 0), rgba(22, 36, 74, 0.5)),
    repeating-linear-gradient(-6deg, rgba(43, 231, 214, 0.14) 0 2px, transparent 2px 16px);
}

/* ---------- 10. 卡片 / 标签 / 数据块 ---------- */
.card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 22px;
  border: 1px solid rgba(43, 231, 214, 0.22);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(22, 36, 74, 0.55), rgba(14, 23, 48, 0.78));
  box-shadow: inset 0 0 0 1px rgba(22, 36, 74, 0.9), var(--shadow-card);
  transition: transform 0.22s ease, border-color 0.22s ease;
}

.card:hover { transform: translateY(-4px); border-color: var(--cyan); }

.card--paper {
  background: var(--paper-2);
  border-color: rgba(14, 23, 48, 0.22);
  color: var(--navy);
}

.card--paper .card__meta,
.card--paper .card__title { color: var(--navy); }

.card__num {
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--hot);
}

.card__title {
  font-family: var(--font-editorial);
  font-size: 19px;
  font-weight: 600;
  line-height: 1.45;
  color: var(--paper);
}

.card__meta {
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--mist);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.4em;
  padding: 3px 8px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--cyan);
  background: rgba(43, 231, 214, 0.06);
}

.tag--hot { border-color: rgba(255, 90, 43, 0.7); color: var(--hot); background: rgba(255, 90, 43, 0.1); }
.tag--gold { border-color: rgba(255, 194, 75, 0.7); color: var(--gold); background: rgba(255, 194, 75, 0.1); }
.tag--violet { border-color: rgba(108, 92, 231, 0.75); color: #b7aeff; background: rgba(108, 92, 231, 0.14); }

.stat { display: flex; flex-direction: column; gap: 2px; }

.stat__value {
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 900;
  font-size: clamp(32px, 4vw, 42px);
  line-height: 1;
  color: var(--cyan);
}

.stat__label {
  font-family: var(--font-data);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--mist);
}

/* ---------- 11. 图片容器（页面阶段放置占位图） ---------- */
.frame-media {
  position: relative;
  overflow: hidden;
  width: 100%;
  border: 1px solid rgba(43, 231, 214, 0.22);
  border-radius: var(--radius);
  background-color: var(--steel);
  background-image:
    repeating-linear-gradient(-6deg, rgba(43, 231, 214, 0.1) 0 2px, transparent 2px 14px),
    radial-gradient(90% 70% at 20% 0%, rgba(108, 92, 231, 0.32), transparent 70%);
}

.frame-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.92) contrast(1.06) brightness(0.96);
  transition: transform 0.32s ease;
}

.frame-media:hover img { transform: scale(1.03); }

.frame-media--16x9 { aspect-ratio: 16 / 9; }
.frame-media--4x3 { aspect-ratio: 4 / 3; }
.frame-media--1x1 { aspect-ratio: 1 / 1; }
.frame-media--3x4 { aspect-ratio: 3 / 4; }
.frame-media--21x9 { aspect-ratio: 21 / 9; }

.frame-media--slant { clip-path: polygon(0 0, 100% 0, 100% 88%, 0 100%); }

.frame-media__cap {
  position: absolute;
  left: 12px;
  bottom: 12px;
  padding: 4px 10px;
  border-radius: var(--radius);
  background: var(--paper-2);
  color: var(--navy);
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: 0.08em;
}

/* ---------- 12. 显现动效协议 ---------- */
.js [data-reveal] {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s ease-out, transform 0.5s ease-out;
}

.js [data-reveal][data-visible] { opacity: 1; transform: none; }

/* ---------- 13. 平板：收窄框架导航 ---------- */
@media (min-width: 760px) and (max-width: 1099px) {
  :root { --rail: 96px; }

  .site-header { align-items: stretch; gap: var(--s3); padding: 16px 10px; }

  .masthead { align-items: center; gap: 12px; }

  .brand { justify-content: center; }

  .brand__text { display: none; }

  .masthead__actions { display: none; }

  .rail__kicker,
  .rail__stamp,
  .rail__link .rail__text { display: none; }

  .rail__link { justify-content: center; padding: 11px 4px; gap: 0; }

  .rail__num { min-width: 0; font-size: 13px; }

  .rail__foot { align-items: center; }

  .rail__foot .btn { width: 100%; padding: 0.6em 0.4em; font-size: 13px; }
}

/* ---------- 14. 手机：顶部栏 + 底部手势条 ---------- */
@media (max-width: 759px) {
  :root { --rail: 0px; }

  body { padding-top: 64px; padding-bottom: 82px; }

  .site-header {
    position: static;
    display: block;
    width: 100%;
    height: auto;
    padding: 0;
    overflow: visible;
    background: transparent;
    border-right: 0;
    box-shadow: none;
  }

  .masthead {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    flex-direction: row;
    align-items: center;
    gap: 10px;
    padding: 10px 14px;
    border-bottom: 1px solid var(--line);
    background: rgba(7, 12, 26, 0.95);
    box-shadow: 0 14px 34px -26px rgba(43, 231, 214, 0.9);
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
  }

  .brand__mark { width: 38px; height: 38px; }
  .brand__mark svg { width: 24px; height: 24px; }
  .brand__name { font-size: 19px; }
  .brand__tag { display: none; }

  .masthead__actions {
    flex-direction: row;
    gap: 8px;
    margin-left: auto;
  }

  .masthead__actions .btn--ghost { display: none; }
  .masthead__actions .btn { padding: 0.6em 0.8em; font-size: 13px; }

  .nav-toggle {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 9px 10px;
    border: 1px solid var(--line-strong);
    border-radius: var(--radius);
    color: var(--cyan);
    font-size: 13px;
    letter-spacing: 0.08em;
  }

  .nav-toggle__bars {
    position: relative;
    display: block;
    width: 16px;
    height: 2px;
    background: currentColor;
    transition: background-color 0.22s ease;
  }

  .nav-toggle__bars::before,
  .nav-toggle__bars::after {
    content: "";
    position: absolute;
    left: 0;
    width: 16px;
    height: 2px;
    background: currentColor;
    transition: transform 0.24s ease;
  }

  .nav-toggle__bars::before { top: -5px; }
  .nav-toggle__bars::after { top: 5px; }

  [data-open="true"] .nav-toggle__bars { background: transparent; }
  [data-open="true"] .nav-toggle__bars::before { transform: translateY(5px) rotate(45deg); }
  [data-open="true"] .nav-toggle__bars::after { transform: translateY(-5px) rotate(-45deg); }

  .rail {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    top: auto;
    z-index: 110;
    width: auto;
    height: auto;
    max-height: 78vh;
    padding: 0 16px 22px;
    overflow-y: auto;
    border-radius: 16px 16px 0 0;
    border-top: 1px solid var(--line-strong);
    background: linear-gradient(180deg, rgba(22, 36, 74, 0.98), rgba(7, 12, 26, 0.99));
    box-shadow: 0 -26px 60px -30px rgba(0, 0, 0, 0.95);
    transform: translateY(calc(100% - 52px));
    transition: transform 0.34s cubic-bezier(0.22, 0.8, 0.28, 1);
  }

  .site-header[data-open="true"] .rail { transform: translateY(0); }

  .rail__handle {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    width: 100%;
    height: 52px;
    padding: 0;
    border-bottom: 1px solid rgba(43, 231, 214, 0.18);
    color: var(--cyan);
    font-size: 13px;
    letter-spacing: 0.1em;
  }

  .rail__handle-bar {
    display: block;
    width: 34px;
    height: 3px;
    border-radius: 3px;
    background: linear-gradient(90deg, var(--cyan), var(--hot));
  }

  .rail__kicker { display: none; }

  .rail__list {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 6px;
    padding-top: 14px;
  }

  .rail__link {
    padding: 12px;
    font-size: 15px;
    background: rgba(14, 23, 48, 0.62);
  }

  .rail__foot {
    flex-direction: row;
    flex-wrap: wrap;
    align-items: center;
    gap: 10px;
    margin-top: 14px;
    padding-top: 14px;
  }

  .rail__stamp { flex: 1 1 100%; }

  .rail__foot .btn { flex: 1 1 auto; }

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

  .footer-legal { font-size: 12.5px; }
}

/* ---------- 15. 桌面：页脚三栏 ---------- */
@media (min-width: 1100px) {
  .site-footer__inner {
    grid-template-columns: minmax(200px, 1.2fr) minmax(0, 2.8fr) minmax(220px, 1.1fr);
    align-items: start;
  }

  .footer-cols { grid-template-columns: repeat(5, minmax(0, 1fr)); }
}

@media (min-width: 620px) and (max-width: 1099px) {
  .footer-cols { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

/* ---------- 16. 动效偏好 ---------- */
@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;
  }

  .js [data-reveal] { opacity: 1; transform: none; }

  .card:hover,
  .btn--hot:hover,
  .btn--ghost:hover,
  .rail__link:hover,
  .footer-col__list a:hover { transform: none; }

  .frame-media:hover img { transform: none; }
}