/* ============================================================
   /assets/site.css — 共享外壳与通用组件
   竞博主页 · 侧轨道仪表盘 / 档案夹视觉系统
   ============================================================ */

/* ---------- 1. 设计令牌 ---------- */
:root{
  --ink-950:#06111C;
  --ink-900:#0A1826;
  --ink-800:#10263A;
  --ink-700:#16334B;

  --cyan:#26D9E8;
  --orange:#FF7A3D;
  --lime:#C8FF4D;
  --ice:#EAF7FF;
  --mist:#9CB4C8;
  --coral:#FFB199;
  --teal:#0F4C5C;

  --line:rgba(156,180,200,.16);
  --line-strong:rgba(38,217,232,.36);

  --rail-w:88px;
  --rail-w-open:272px;
  --bar-h:64px;

  --gutter:clamp(18px,4vw,52px);
  --max:1240px;

  --r-lg:22px;
  --r-md:16px;
  --r-sm:10px;

  --font-display:"Barlow Condensed","Arial Narrow","PingFang SC","Noto Sans SC","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,"Courier New",monospace;

  --ease:cubic-bezier(.22,.61,.36,1);
  --t-fast:160ms;
  --t:220ms;
}

/* ---------- 2. 重置 ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
@media (prefers-reduced-motion:no-preference){html{scroll-behavior:smooth}}
body,h1,h2,h3,h4,h5,p,ul,ol,li,figure,blockquote,dl,dd{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,video,picture{display:block;max-width:100%}
img{height:auto}
button,input,select,textarea{font:inherit;color:inherit}
button{background:none;border:0;padding:0;cursor:pointer}
a{color:inherit;text-decoration:none}
::selection{background:var(--cyan);color:#04222A}

/* ---------- 3. 基础排版 ---------- */
body{
  min-height:100vh;
  background-color:var(--ink-950);
  background-image:
    radial-gradient(860px 580px at 88% -12%, rgba(38,217,232,.10), transparent 62%),
    radial-gradient(700px 540px at -8% 104%, rgba(255,122,61,.09), transparent 64%);
  background-repeat:no-repeat;
  background-attachment:fixed;
  color:var(--ice);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.75;
  letter-spacing:.012em;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
@media (max-width:1023px){ body{padding-top:var(--bar-h)} }
@media (min-width:1024px){ body{padding-left:var(--rail-w)} }

h1,h2,h3,h4{
  font-family:var(--font-display);
  font-weight:800;
  line-height:1.12;
  letter-spacing:-.015em;
  color:var(--ice);
}
h1{font-size:clamp(34px,5.4vw,64px);font-weight:900;line-height:1;letter-spacing:-.025em}
h2{font-size:clamp(25px,3.2vw,38px)}
h3{font-size:clamp(19px,2vw,24px)}
p{max-width:64ch}

#main-content{scroll-margin-top:calc(var(--bar-h) + 12px)}
@media (min-width:1024px){ #main-content{scroll-margin-top:16px} }

:focus-visible{
  outline:2px solid var(--lime);
  outline-offset:3px;
  border-radius:6px;
}

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

/* ---------- 4. 布局原语 ---------- */
.wrap{
  width:100%;
  max-width:var(--max);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.section{padding-block:clamp(46px,6.4vw,100px)}
.mono{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  font-feature-settings:"tnum" 1;
  letter-spacing:.03em;
}
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:9px;
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:600;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--mist);
}
.eyebrow::before{
  content:"";
  width:18px;height:2px;border-radius:2px;
  background:linear-gradient(90deg,var(--cyan),var(--orange));
}
.display{
  font-family:var(--font-display);
  font-weight:900;
  line-height:.9;
  letter-spacing:-.03em;
  color:var(--ice);
  font-size:clamp(46px,8.6vw,124px);
}
.lede{
  max-width:42ch;
  font-size:clamp(16px,1.5vw,18px);
  line-height:1.8;
  color:var(--mist);
}
.grid{display:grid;gap:clamp(14px,2vw,24px)}
.grid--2{grid-template-columns:repeat(auto-fit,minmax(min(100%,320px),1fr))}
.grid--3{grid-template-columns:repeat(auto-fit,minmax(min(100%,262px),1fr))}

/* ---------- 5. 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:.6em;
  padding:.86em 1.55em;
  border-radius:999px;
  border:1px solid transparent;
  font-family:var(--font-display);
  font-weight:800;
  font-size:15px;
  letter-spacing:.05em;
  line-height:1.2;
  transition:transform var(--t) var(--ease),
             background-color var(--t) var(--ease),
             border-color var(--t) var(--ease),
             color var(--t) var(--ease),
             box-shadow var(--t) var(--ease);
}
.btn--primary{
  background:var(--cyan);
  color:#03222A;
  box-shadow:0 12px 30px -16px rgba(38,217,232,.9);
}
.btn--primary:hover{background:#5CE6F0;transform:translateY(-2px)}
.btn--warm{
  background:var(--orange);
  color:#2B1003;
  box-shadow:0 12px 30px -16px rgba(255,122,61,.95);
}
.btn--warm:hover{background:#FF9463;transform:translateY(-2px)}
.btn--ghost{
  border-color:var(--line-strong);
  color:var(--ice);
}
.btn--ghost:hover{
  border-color:var(--cyan);
  color:var(--cyan);
  background:rgba(38,217,232,.08);
}
.btn--sm{padding:.55em 1.1em;font-size:13px}

/* ---------- 6. 标签 ---------- */
.tag{
  display:inline-flex;
  align-items:center;
  gap:7px;
  padding:4px 11px;
  border-radius:999px;
  border:1px solid var(--line);
  background:rgba(16,38,58,.72);
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:600;
  letter-spacing:.1em;
  color:var(--mist);
  white-space:nowrap;
}
.tag--cyan{color:var(--cyan);border-color:rgba(38,217,232,.4);background:rgba(38,217,232,.1)}
.tag--orange{color:var(--orange);border-color:rgba(255,122,61,.42);background:rgba(255,122,61,.1)}
.tag--lime{color:var(--lime);border-color:rgba(200,255,77,.4);background:rgba(200,255,77,.1)}

/* ---------- 7. 卡片与面板 ---------- */
.card,.panel{
  position:relative;
  padding:clamp(18px,2.2vw,26px);
  border-radius:var(--r-lg);
  border:1px solid var(--line);
  background:linear-gradient(170deg, rgba(16,38,58,.9), rgba(10,24,38,.95));
}
.card{
  display:flex;
  flex-direction:column;
  gap:12px;
  transition:border-color var(--t) var(--ease),
             transform var(--t) var(--ease),
             box-shadow var(--t) var(--ease);
}
.card:hover{
  border-color:var(--line-strong);
  transform:translateY(-3px);
  box-shadow:0 26px 50px -34px rgba(0,0,0,.95);
}

/* ---------- 8. 图片容器 ---------- */
.media{
  position:relative;
  display:block;
  overflow:hidden;
  border-radius:var(--r-lg);
  border:1px solid var(--line);
  aspect-ratio:16/9;
  background-color:var(--ink-800);
  background-image:
    linear-gradient(150deg, rgba(38,217,232,.16), rgba(6,17,28,.9) 52%, rgba(255,122,61,.16)),
    repeating-linear-gradient(135deg, rgba(234,247,255,.05) 0 2px, transparent 2px 12px);
}
.media > img,
.media > picture img{
  position:absolute;
  inset:0;
  width:100%;
  height:100%;
  object-fit:cover;
  transition:transform 460ms var(--ease);
}
.media:hover > img{transform:scale(1.03)}
.media--wide{aspect-ratio:21/9}
.media--tall{aspect-ratio:3/4}
.media--square{aspect-ratio:1/1}
.media--screen{aspect-ratio:16/10}
.media__caption{
  position:absolute;
  left:14px;bottom:12px;
  z-index:2;
  padding:4px 10px;
  border-radius:999px;
  border:1px solid var(--line);
  background:rgba(6,17,28,.78);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.1em;
  color:rgba(234,247,255,.82);
}

/* ---------- 9. 面包屑 ---------- */
.crumbs{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.06em;
  color:var(--mist);
}
.crumbs a{
  color:var(--mist);
  border-bottom:1px solid transparent;
  transition:color var(--t-fast) var(--ease),border-color var(--t-fast) var(--ease);
}
.crumbs a:hover{color:var(--cyan);border-bottom-color:rgba(38,217,232,.55)}
.crumbs [aria-current="page"]{color:var(--ice)}
.crumbs__sep{color:rgba(156,180,200,.45)}

/* ---------- 10. 长文 ---------- */
.prose{
  max-width:68ch;
  font-size:17px;
  line-height:1.85;
  color:rgba(234,247,255,.86);
}
.prose > * + *{margin-top:1.05em}
.prose h2{margin-top:2em;font-size:clamp(22px,2.4vw,30px)}
.prose h3{margin-top:1.7em;color:var(--cyan)}
.prose p{max-width:none}
.prose ul{display:flex;flex-direction:column;gap:.5em}
.prose li{position:relative;padding-left:1.5em}
.prose li::before{
  content:"";
  position:absolute;
  left:0;top:.72em;
  width:7px;height:7px;
  border-radius:2px;
  background:var(--cyan);
}
.prose strong{color:var(--ice)}
.prose a{
  color:var(--cyan);
  text-decoration:underline;
  text-underline-offset:3px;
  text-decoration-thickness:1px;
}
.prose hr{
  border:0;
  border-top:1px solid var(--line);
  margin-block:2em;
}

/* ---------- 11. 显现动效 ---------- */
.reveal{opacity:1;transform:none}
html.js .reveal{
  opacity:0;
  transform:translateY(16px);
  transition:opacity 460ms var(--ease),transform 460ms var(--ease);
}
html.js .reveal.is-visible{opacity:1;transform:none}

/* ============================================================
   12. 页头 · 侧边轨道导航
   ============================================================ */
.skip-link{
  position:fixed;
  top:10px;left:10px;
  z-index:400;
  padding:10px 18px;
  border-radius:10px;
  background:var(--lime);
  color:#10230A;
  font-family:var(--font-mono);
  font-size:13px;
  font-weight:700;
  letter-spacing:.04em;
  transform:translateY(-180%);
  transition:transform 180ms var(--ease);
}
.skip-link:focus,
.skip-link:focus-visible{transform:translateY(0)}

.rail{
  position:fixed;
  inset:0 auto 0 0;
  z-index:90;
  width:var(--rail-w);
  display:flex;
  flex-direction:column;
  gap:14px;
  padding:16px 12px;
  overflow:hidden;
  background:linear-gradient(180deg,#081826 0%,#06111C 56%,#07141F 100%);
  border-right:1px solid var(--line);
  transition:width var(--t) var(--ease),box-shadow var(--t) var(--ease);
}

/* 品牌 */
.rail__top{
  display:flex;
  align-items:center;
  gap:10px;
  flex:0 0 auto;
  min-width:0;
}
.rail__brand{
  display:flex;
  align-items:center;
  gap:11px;
  min-width:0;
  padding:2px;
  border-radius:var(--r-md);
}
.rail__mark{
  width:44px;height:44px;
  flex:0 0 44px;
  display:grid;
  place-items:center;
  border-radius:14px;
  background:linear-gradient(145deg,var(--cyan) 0%,#17A9BC 58%,var(--teal) 100%);
  color:#04222A;
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:700;
  letter-spacing:.04em;
  box-shadow:0 10px 24px -14px rgba(38,217,232,.95);
}
.rail__brand-text{
  display:flex;
  flex-direction:column;
  min-width:0;
  white-space:nowrap;
  transition:opacity var(--t-fast) var(--ease),transform var(--t) var(--ease);
}
.rail__name{
  font-family:var(--font-display);
  font-weight:900;
  font-size:16px;
  line-height:1.25;
  letter-spacing:.01em;
  color:var(--ice);
}
.rail__tagline{
  font-family:var(--font-mono);
  font-size:10.5px;
  line-height:1.5;
  letter-spacing:.08em;
  color:var(--mist);
}

/* 菜单按钮 */
.rail__toggle{
  display:none;
  align-items:center;
  gap:9px;
  height:44px;
  padding:0 15px;
  border-radius:var(--r-md);
  border:1px solid var(--line-strong);
  color:var(--ice);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.1em;
  transition:border-color var(--t-fast) var(--ease),background-color var(--t-fast) var(--ease);
}
.rail__toggle:hover{background:rgba(38,217,232,.1);border-color:var(--cyan)}
.rail__toggle-lines{display:grid;gap:4px;width:16px}
.rail__toggle-lines span{
  display:block;
  height:2px;
  border-radius:2px;
  background:var(--cyan);
  transition:transform var(--t) var(--ease),opacity var(--t-fast) var(--ease);
}
.rail[data-open] .rail__toggle-lines span:nth-child(1){transform:translateY(6px) rotate(45deg)}
.rail[data-open] .rail__toggle-lines span:nth-child(2){opacity:0}
.rail[data-open] .rail__toggle-lines span:nth-child(3){transform:translateY(-6px) rotate(-45deg)}

/* 导航 */
.rail__nav{flex:1 1 auto;min-height:0;margin-top:6px}
.rail__list{display:flex;flex-direction:column;gap:4px}
.rail__item{display:block}
.rail__link{
  position:relative;
  display:flex;
  align-items:center;
  gap:12px;
  height:46px;
  padding:0 10px;
  border-radius:12px;
  border:1px solid transparent;
  color:var(--mist);
  white-space:nowrap;
  transition:background-color var(--t-fast) var(--ease),
             border-color var(--t-fast) var(--ease),
             color var(--t-fast) var(--ease);
}
.rail__idx{
  width:24px;
  flex:0 0 24px;
  text-align:center;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.06em;
  color:var(--mist);
  transition:color var(--t-fast) var(--ease);
}
.rail__label{
  font-family:var(--font-display);
  font-weight:700;
  font-size:15px;
  letter-spacing:.04em;
  transition:opacity var(--t-fast) var(--ease),transform var(--t) var(--ease);
}
.rail__link:hover{
  background:rgba(38,217,232,.09);
  border-color:rgba(38,217,232,.24);
  color:var(--ice);
}
.rail__link:hover .rail__idx{color:var(--cyan)}
.rail__link[aria-current="page"]{
  background:linear-gradient(90deg, rgba(38,217,232,.2), rgba(38,217,232,.05));
  border-color:rgba(38,217,232,.34);
  color:var(--ice);
  box-shadow:inset 2px 0 0 0 var(--cyan);
}
.rail__link[aria-current="page"] .rail__idx{
  color:var(--cyan);
  font-weight:700;
}

/* 轨道主行动 */
.rail__cta{
  display:flex;
  align-items:center;
  justify-content:center;
  gap:10px;
  height:46px;
  width:46px;
  padding:0 11px;
  margin-top:6px;
  border-radius:14px;
  overflow:hidden;
  white-space:nowrap;
  background:var(--orange);
  color:#2B1003;
  font-family:var(--font-display);
  font-weight:800;
  font-size:14px;
  letter-spacing:.04em;
  box-shadow:0 14px 30px -18px rgba(255,122,61,.95);
  transition:width var(--t) var(--ease),background-color var(--t-fast) var(--ease);
}
.rail__cta:hover{background:#FF9463}
.rail__cta-icon{flex:0 0 24px;display:grid;place-items:center;font-size:15px}
.rail__cta-text{opacity:0;transition:opacity var(--t-fast) var(--ease) 40ms}

/* 进度环 / 回到顶部 */
.rail__meter{
  display:flex;
  align-items:center;
  justify-content:center;
  gap:10px;
  width:100%;
  margin-top:10px;
  padding-top:12px;
  border-top:1px solid var(--line);
  color:var(--mist);
  transition:color var(--t-fast) var(--ease);
}
.rail__meter:hover{color:var(--cyan)}
.rail__ring{
  width:38px;height:38px;
  flex:0 0 38px;
  transform:rotate(-90deg);
}
.rail__ring-track{fill:none;stroke:rgba(156,180,200,.2);stroke-width:3}
.rail__ring-value{
  fill:none;
  stroke:var(--cyan);
  stroke-width:3;
  stroke-linecap:round;
  stroke-dasharray:100 100;
  stroke-dashoffset:100;
  transition:stroke-dashoffset 140ms linear;
}
.rail__ring-num{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.04em;
  color:var(--mist);
  opacity:0;
  transition:opacity var(--t-fast) var(--ease);
}

/* 桌面端：收起 → 展开 */
@media (min-width:1024px){
  .rail__brand-text{opacity:0;transform:translateX(-6px)}
  .rail__label{opacity:0;transform:translateX(-8px)}
  .rail:hover,
  .rail:focus-within{width:var(--rail-w-open);box-shadow:26px 0 64px -34px rgba(0,0,0,.95)}
  .rail:hover .rail__brand-text,
  .rail:focus-within .rail__brand-text{opacity:1;transform:none}
  .rail:hover .rail__label,
  .rail:focus-within .rail__label{opacity:1;transform:none}
  .rail:hover .rail__cta,
  .rail:focus-within .rail__cta{width:100%}
  .rail:hover .rail__cta-text,
  .rail:focus-within .rail__cta-text{opacity:1}
  .rail:hover .rail__ring-num,
  .rail:focus-within .rail__ring-num{opacity:1}
}

/* 移动端：顶部条 + 抽屉 */
@media (max-width:1023px){
  .rail{
    inset:0 0 auto 0;
    width:100%;
    height:var(--bar-h);
    flex-direction:row;
    align-items:center;
    gap:12px;
    padding:0 16px;
    border-right:0;
    border-bottom:1px solid var(--line);
    box-shadow:0 18px 40px -34px rgba(0,0,0,.95);
  }
  .rail__top{flex:1 1 auto}
  .rail__brand-text{opacity:1;transform:none}
  .rail__tagline{display:none}
  .rail__toggle{display:inline-flex}
  .rail__nav{
    position:fixed;
    left:0;right:0;
    top:var(--bar-h);
    margin-top:0;
    padding:10px 16px 22px;
    max-height:calc(100dvh - var(--bar-h));
    overflow-y:auto;
    background:linear-gradient(180deg,#0B1B2B 0%,#06111C 100%);
    border-bottom:1px solid var(--line);
    box-shadow:0 30px 60px -30px rgba(0,0,0,.95);
    opacity:0;
    visibility:hidden;
    transform:translateY(-10px);
    transition:opacity var(--t) var(--ease),
               transform var(--t) var(--ease),
               visibility 0s linear var(--t);
  }
  .rail[data-open] .rail__nav{
    opacity:1;
    visibility:visible;
    transform:translateY(0);
    transition-delay:0s;
  }
  .rail__link{height:52px;padding:0 12px}
  .rail__label{opacity:1;transform:none;font-size:16px}
  .rail__idx{color:var(--cyan)}
  .rail__cta{display:none}
  .rail__meter{display:none}
}

/* ============================================================
   13. 页脚
   ============================================================ */
.site-footer{
  position:relative;
  margin-top:clamp(40px,6vw,96px);
  overflow:hidden;
  border-top:1px solid var(--line);
  background:linear-gradient(180deg, rgba(15,76,92,.3) 0%, rgba(8,22,36,.96) 48%, #06111C 100%);
}
.site-footer::before{
  content:"";
  position:absolute;
  top:-160px;right:-140px;
  width:420px;height:420px;
  border-radius:50%;
  background:radial-gradient(circle at 32% 32%, rgba(255,122,61,.2), rgba(255,122,61,0) 68%);
  pointer-events:none;
}
.site-footer::after{
  content:"";
  position:absolute;
  bottom:-180px;left:-120px;
  width:400px;height:400px;
  border-radius:50%;
  background:radial-gradient(circle at 60% 40%, rgba(38,217,232,.14), rgba(38,217,232,0) 70%);
  pointer-events:none;
}
.footer__inner{
  position:relative;
  z-index:1;
  max-width:var(--max);
  margin-inline:auto;
  padding:clamp(38px,5.6vw,74px) var(--gutter) 26px;
}
.footer__top{
  display:grid;
  grid-template-columns:1fr;
  gap:clamp(26px,3.6vw,44px);
}
.footer__lead{max-width:34em}
.footer__kicker{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--mist);
}
.footer__wordmark{
  margin:14px 0 16px;
  font-family:var(--font-display);
  font-weight:900;
  font-size:clamp(34px,6.2vw,62px);
  line-height:.98;
  letter-spacing:-.025em;
  color:var(--ice);
  max-width:9em;
}
@supports ((-webkit-background-clip:text) or (background-clip:text)){
  .footer__wordmark{
    background:linear-gradient(96deg, var(--ice) 8%, var(--cyan) 58%, var(--orange) 100%);
    -webkit-background-clip:text;
    background-clip:text;
    color:transparent;
    -webkit-text-fill-color:transparent;
  }
}
.footer__summary{
  max-width:32ch;
  font-size:15.5px;
  line-height:1.75;
  color:var(--mist);
}
.footer__cta{margin-top:22px}
.footer__col{min-width:0}
.footer__col-title{
  display:flex;
  align-items:center;
  gap:8px;
  margin-bottom:14px;
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:700;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--mist);
}
.footer__col-title::before{
  content:"";
  width:6px;height:6px;
  border-radius:2px;
  background:var(--orange);
}
.footer__list{display:flex;flex-direction:column;gap:9px}
.footer__link{
  display:inline-block;
  font-size:15px;
  color:rgba(234,247,255,.76);
  border-bottom:1px solid transparent;
  padding-bottom:1px;
  transition:color var(--t-fast) var(--ease),border-color var(--t-fast) var(--ease);
}
.footer__link:hover{color:var(--cyan);border-bottom-color:rgba(38,217,232,.55)}
.footer__contact{display:flex;flex-direction:column;gap:9px}
.footer__contact-item{
  display:flex;
  flex-direction:column;
  gap:2px;
  padding:10px 12px;
  border-radius:var(--r-sm);
  border:1px solid var(--line);
  background:rgba(16,38,58,.62);
}
.footer__contact-label{
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--mist);
}
.footer__contact-value{
  font-size:14px;
  line-height:1.55;
  color:var(--ice);
  overflow-wrap:anywhere;
}
.footer__bottom{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:12px 28px;
  margin-top:clamp(28px,4vw,50px);
  padding-top:18px;
  border-top:1px solid var(--line);
}
.footer__meta{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.04em;
  color:var(--mist);
}
.footer__meta--note{
  max-width:52ch;
  color:rgba(156,180,200,.74);
}

@media (min-width:720px){
  .footer__top{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer__lead{grid-column:1 / -1}
}
@media (min-width:1080px){
  .footer__top{grid-template-columns:minmax(0,1.6fr) repeat(3,minmax(0,.78fr))}
  .footer__lead{grid-column:auto}
}

/* ============================================================
   14. 减少动效
   ============================================================ */
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{
    animation-duration:.01ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.01ms !important;
    scroll-behavior:auto !important;
  }
  html{scroll-behavior:auto}
  .reveal,html.js .reveal{opacity:1 !important;transform:none !important}
  .rail:hover,.rail:focus-within{width:var(--rail-w)}
  .media:hover > img{transform:none}
}