/* =========================================================
   U球体育免费版 — /assets/site.css
   共享外壳：reset / tokens / 排版 / 头部 / 页脚 / 按钮 /
   面包屑 / 容器 / 网格 / 基础组件 / 响应式 / 减少动效
   ========================================================= */

/* ---------- 1. Reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{
  -webkit-text-size-adjust:100%;
  text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:calc(var(--header-h) + 20px);
}
body,h1,h2,h3,h4,h5,p,figure,blockquote,ul,ol,dl,dd{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,video{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer}
table{border-collapse:collapse;width:100%}
::selection{background:rgba(50,230,208,.28);color:#fff}

/* ---------- 2. Tokens ---------- */
:root{
  --void:#070B14;
  --panel:#0D1526;
  --panel-hi:#101B2F;
  --line:#1B2C49;
  --line-soft:rgba(27,44,73,.55);
  --ink:#E9F2FF;
  --ink-dim:#8EA3C0;
  --fog:#C7D5E8;
  --cyan:#32E6D0;
  --flame:#FF5A3C;
  --blue:#4C8DFF;
  --mint:#5BE38A;

  --font-display:"Oswald","Barlow Condensed","Noto Sans SC","Source Han Sans SC",system-ui,sans-serif;
  --font-body:"Noto Sans SC","Source Han Sans SC",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"IBM Plex Mono","Roboto Mono",ui-monospace,SFMono-Regular,Menlo,monospace;

  --shell:1440px;
  --gutter:clamp(18px,4vw,64px);
  --gap:clamp(16px,2vw,28px);
  --header-h:80px;
  --radius:3px;
  --ease:cubic-bezier(.22,.61,.36,1);
  --shadow-panel:0 26px 64px -50px rgba(0,0,0,.95);
}

/* ---------- 3. Base ---------- */
body{
  min-height:100vh;
  background-color:var(--void);
  background-image:
    radial-gradient(920px 520px at 84% -10%, rgba(50,230,208,.10), transparent 62%),
    radial-gradient(780px 500px at 6% 2%, rgba(76,141,255,.11), transparent 66%),
    radial-gradient(680px 420px at 64% 98%, rgba(255,90,60,.07), transparent 70%);
  background-attachment:fixed;
  background-repeat:no-repeat;
  color:var(--ink);
  font-family:var(--font-body);
  font-size:16px;
  font-weight:400;
  line-height:1.7;
  letter-spacing:.01em;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

main,#main-content{padding-top:calc(var(--header-h) + 16px)}
main.site-main--overlay{padding-top:0}

h1,h2,h3,h4,h5{
  font-family:var(--font-display);
  font-weight:700;
  line-height:1.1;
  letter-spacing:.005em;
  color:var(--ink);
}
p{max-width:74ch}
strong,b{font-weight:700;color:#fff}
small{font-size:12.5px}

/* ---------- 4. 排版工具 ---------- */
.h-display{
  font-size:clamp(38px,5.4vw,68px);
  line-height:1.02;
  letter-spacing:-.012em;
  font-weight:800;
}
.h-section{
  font-size:clamp(26px,3vw,38px);
  line-height:1.12;
  letter-spacing:-.005em;
}
.h-mini{
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:500;
  letter-spacing:.22em;
  text-transform:uppercase;
  color:var(--ink-dim);
}
.lead{
  font-size:clamp(16.5px,1.35vw,19px);
  line-height:1.8;
  color:var(--fog);
  max-width:62ch;
}
.mono{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  letter-spacing:.02em;
}
.meta{
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.12em;
  text-transform:uppercase;
  color:var(--ink-dim);
  font-variant-numeric:tabular-nums;
}
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.26em;
  text-transform:uppercase;
  color:var(--cyan);
}
.eyebrow::before{content:"";width:22px;height:1px;background:currentColor;opacity:.75;flex:none}
.prose p + p{margin-top:1em}
.prose p{color:var(--fog);line-height:1.8}
.prose a{color:var(--cyan);border-bottom:1px solid rgba(50,230,208,.35)}
.prose a:hover{border-bottom-color:var(--cyan)}

/* ---------- 5. 焦点与跳转 ---------- */
:focus-visible{
  outline:2px solid var(--cyan);
  outline-offset:3px;
  border-radius:2px;
}
.skip-link{
  position:absolute;
  top:10px;
  left:var(--gutter);
  z-index:220;
  padding:10px 18px;
  background:var(--cyan);
  color:#04120F;
  font-weight:700;
  font-size:13px;
  letter-spacing:.08em;
  border-radius:2px;
  transform:translateY(-180%);
  transition:transform .22s var(--ease);
}
.skip-link:focus{transform:translateY(0)}

/* ---------- 6. 头部 ---------- */
.site-header{
  position:fixed;
  inset:0 0 auto;
  z-index:100;
  --h:var(--header-h);
  background:linear-gradient(180deg, rgba(7,11,20,.84), rgba(7,11,20,0));
  transition:background .3s var(--ease), box-shadow .3s var(--ease);
}
.site-header[data-scrolled="true"]{
  --h:64px;
  background:rgba(9,14,26,.95);
  box-shadow:0 1px 0 var(--line), 0 26px 54px -44px #000;
}
@supports ((-webkit-backdrop-filter:blur(1px)) or (backdrop-filter:blur(1px))){
  .site-header[data-scrolled="true"]{
    -webkit-backdrop-filter:blur(16px) saturate(140%);
    backdrop-filter:blur(16px) saturate(140%);
  }
}
.header-shell{
  position:relative;
  display:flex;
  align-items:center;
  gap:clamp(14px,2.4vw,40px);
  height:var(--h);
  max-width:var(--shell);
  margin-inline:auto;
  padding-inline:var(--gutter);
  transition:height .3s var(--ease);
}

/* 品牌 */
.brand{
  display:flex;
  align-items:center;
  gap:12px;
  flex:0 0 auto;
  min-width:0;
}
.brand-mark{
  position:relative;
  flex:none;
  width:34px;
  height:34px;
  display:grid;
  place-items:center;
  border:1px solid var(--line);
  border-radius:3px;
  background:linear-gradient(150deg, rgba(50,230,208,.18), rgba(76,141,255,.06));
  transition:border-color .2s var(--ease), box-shadow .2s var(--ease);
}
.brand-mark::before,
.brand-mark::after{
  content:"";
  position:absolute;
  width:7px;
  height:7px;
  border:1px solid rgba(50,230,208,.55);
}
.brand-mark::before{top:4px;left:4px;border-right:0;border-bottom:0}
.brand-mark::after{bottom:4px;right:4px;border-left:0;border-top:0}
.brand-mark-core{
  display:block;
  width:11px;
  height:11px;
  border-radius:2px;
  background:var(--cyan);
  box-shadow:0 0 14px rgba(50,230,208,.85);
}
.brand:hover .brand-mark{border-color:rgba(50,230,208,.6);box-shadow:0 0 0 1px rgba(50,230,208,.18)}
.brand-text{display:block;min-width:0}
.brand-name{
  display:block;
  font-family:var(--font-display);
  font-size:19px;
  font-weight:700;
  letter-spacing:.04em;
  line-height:1.1;
  color:var(--ink);
  white-space:nowrap;
}
.brand-tag{
  display:block;
  margin-top:3px;
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--ink-dim);
  white-space:nowrap;
}

/* 导航 */
.site-nav{
  flex:1 1 auto;
  display:flex;
  justify-content:center;
  min-width:0;
}
.nav-list{
  display:flex;
  align-items:center;
  gap:clamp(8px,1.5vw,26px);
}
.nav-link{
  position:relative;
  display:inline-flex;
  align-items:baseline;
  gap:6px;
  padding:8px 2px;
  font-size:14.5px;
  line-height:1.4;
  color:var(--fog);
  letter-spacing:.02em;
  transition:color .2s var(--ease);
  white-space:nowrap;
}
.nav-index{
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.06em;
  color:var(--ink-dim);
  opacity:.85;
  transition:color .2s var(--ease);
}
.nav-label{display:inline-block}
.nav-link::after{
  content:"";
  position:absolute;
  left:0;right:0;bottom:2px;
  height:1px;
  background:var(--cyan);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform .22s var(--ease);
}
.nav-link:hover{color:var(--ink)}
.nav-link:hover::after{transform:scaleX(1)}
.nav-link[aria-current="page"]{color:var(--cyan)}
.nav-link[aria-current="page"] .nav-index{color:var(--cyan);opacity:1}
.nav-link[aria-current="page"]::after{transform:scaleX(1);box-shadow:0 0 10px rgba(50,230,208,.7)}
.nav-foot{
  display:none;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--ink-dim);
}

/* 头部动作 */
.header-actions{
  display:flex;
  align-items:center;
  gap:10px;
  margin-left:auto;
  flex:0 0 auto;
}

/* 汉堡按钮 */
.nav-toggle{
  display:none;
  align-items:center;
  gap:9px;
  padding:9px 13px;
  border:1px solid var(--line);
  border-radius:2px;
  background:rgba(13,21,38,.72);
  color:var(--fog);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.16em;
  text-transform:uppercase;
  transition:border-color .2s var(--ease), color .2s var(--ease);
}
.nav-toggle:hover{border-color:rgba(50,230,208,.55);color:var(--ink)}
.nav-toggle-bars{display:grid;gap:4px;width:16px;flex:none}
.nav-toggle-bars i{
  display:block;
  height:1.5px;
  background:currentColor;
  transition:transform .26s var(--ease), opacity .18s var(--ease);
}
[data-nav-toggle][aria-expanded="true"]{color:var(--cyan);border-color:rgba(50,230,208,.55)}
[data-nav-toggle][aria-expanded="true"] .nav-toggle-bars i:nth-child(1){transform:translateY(5.5px) rotate(45deg)}
[data-nav-toggle][aria-expanded="true"] .nav-toggle-bars i:nth-child(2){opacity:0}
[data-nav-toggle][aria-expanded="true"] .nav-toggle-bars i:nth-child(3){transform:translateY(-5.5px) rotate(-45deg)}

/* 阅读进度 */
.header-progress{
  position:absolute;
  left:0;right:0;bottom:0;
  height:2px;
  background:rgba(27,44,73,.55);
  overflow:hidden;
}
.header-progress > span{
  display:block;
  height:100%;
  width:100%;
  transform:scaleX(0);
  transform-origin:0 50%;
  background:linear-gradient(90deg, var(--cyan), var(--blue) 55%, var(--flame));
  box-shadow:0 0 12px rgba(50,230,208,.6);
}

/* ---------- 7. 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:10px 18px;
  border:1px solid transparent;
  border-radius:2px;
  font-size:13.5px;
  font-weight:500;
  letter-spacing:.06em;
  line-height:1.3;
  white-space:nowrap;
  transition:background .2s var(--ease), color .2s var(--ease),
             border-color .2s var(--ease), box-shadow .2s var(--ease);
}
.btn-primary{
  background:var(--cyan);
  color:#04120F;
  font-weight:700;
  box-shadow:0 0 0 1px rgba(50,230,208,.5), 0 16px 34px -22px rgba(50,230,208,.95);
}
.btn-primary:hover{background:#5ff0dd;box-shadow:0 0 0 1px rgba(50,230,208,.75), 0 18px 40px -20px rgba(50,230,208,1)}
.btn-primary:active{transform:translateY(1px)}
.btn-ghost{
  border-color:var(--line);
  background:rgba(13,21,38,.62);
  color:var(--fog);
}
.btn-ghost:hover{border-color:rgba(50,230,208,.55);color:var(--ink);background:rgba(50,230,208,.07)}
.btn-quiet{
  padding:8px 12px;
  border-color:var(--line-soft);
  color:var(--ink-dim);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.16em;
  text-transform:uppercase;
}
.btn-quiet:hover{color:var(--cyan);border-color:rgba(50,230,208,.5)}

/* ---------- 8. 页脚 ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(56px,8vw,112px);
  border-top:1px solid var(--line);
  background:linear-gradient(180deg, rgba(13,21,38,.62), rgba(7,11,20,.96));
  overflow:hidden;
}
.site-footer::before{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background-image:linear-gradient(to right, var(--line-soft) 1px, transparent 1px);
  background-size:clamp(64px,8vw,120px) 100%;
  opacity:.4;
  -webkit-mask-image:linear-gradient(180deg, #000, transparent 82%);
  mask-image:linear-gradient(180deg, #000, transparent 82%);
}
.footer-shell{position:relative;padding-top:clamp(40px,6vw,76px)}
.footer-top{
  display:grid;
  grid-template-columns:minmax(0,1.05fr) minmax(0,1.75fr) minmax(0,1fr);
  gap:clamp(28px,4vw,64px);
  align-items:start;
}
.footer-brand-name{
  display:block;
  font-family:var(--font-display);
  font-size:22px;
  font-weight:700;
  letter-spacing:.05em;
  color:var(--ink);
  line-height:1.2;
}
.footer-brand-line{
  display:block;
  margin-top:8px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--cyan);
}
.footer-note{
  margin-top:16px;
  max-width:32ch;
  font-size:13px;
  line-height:1.75;
  color:var(--ink-dim);
}
.footer-cols{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:clamp(18px,3vw,40px);
}
.footer-col-title{
  display:flex;
  align-items:center;
  gap:8px;
  margin-bottom:16px;
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:500;
  letter-spacing:.22em;
  text-transform:uppercase;
  color:var(--ink-dim);
}
.footer-col-title::before{
  content:"";
  width:5px;height:5px;
  flex:none;
  background:var(--cyan);
  box-shadow:0 0 10px rgba(50,230,208,.9);
}
.footer-links li + li{margin-top:10px}
.footer-links a{
  display:inline-block;
  font-size:14px;
  color:var(--fog);
  transition:color .2s var(--ease), transform .2s var(--ease);
}
.footer-links a:hover{color:var(--cyan);transform:translateX(3px)}
.footer-contact-list li{
  display:grid;
  grid-template-columns:46px minmax(0,1fr);
  gap:12px;
  padding:10px 0;
  border-bottom:1px dashed var(--line-soft);
}
.footer-contact-list li:last-child{border-bottom:0}
.footer-key{
  padding-top:2px;
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--ink-dim);
}
.footer-val{
  font-size:13.5px;
  line-height:1.65;
  color:var(--fog);
  overflow-wrap:anywhere;
}
.footer-bottom{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  margin-top:clamp(30px,4vw,54px);
  padding-block:22px 28px;
  border-top:1px solid var(--line);
}
.footer-legal{
  font-size:12.5px;
  letter-spacing:.03em;
  color:var(--ink-dim);
  line-height:1.7;
}
.footer-icp{color:var(--fog);margin-left:6px}
.to-top{
  display:inline-flex;
  align-items:center;
  gap:10px;
  padding:8px 14px;
  border:1px solid var(--line);
  border-radius:2px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--ink-dim);
  transition:color .2s var(--ease), border-color .2s var(--ease), background .2s var(--ease);
}
.to-top:hover{color:var(--cyan);border-color:rgba(50,230,208,.55);background:rgba(50,230,208,.06)}
.footer-rail{
  position:relative;
  height:10px;
  background:repeating-linear-gradient(90deg, var(--line) 0 1px, transparent 1px 26px);
  opacity:.7;
}

/* ---------- 9. 容器与版式 ---------- */
.shell{
  width:100%;
  max-width:var(--shell);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.section{
  position:relative;
  padding-block:clamp(48px,7vw,96px);
}
.section--tight{padding-block:clamp(30px,4vw,56px)}
.section-head{
  display:flex;
  flex-wrap:wrap;
  align-items:flex-end;
  justify-content:space-between;
  gap:18px;
  margin-bottom:clamp(22px,3vw,38px);
  padding-bottom:18px;
  border-bottom:1px solid var(--line);
}
.rule{height:1px;border:0;background:var(--line);width:100%}
.rule--grad{background:linear-gradient(90deg, var(--cyan), rgba(50,230,208,0))}

/* 面包屑 */
.breadcrumb{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--ink-dim);
}
.breadcrumb a{color:var(--fog);transition:color .2s var(--ease)}
.breadcrumb a:hover{color:var(--cyan)}
.breadcrumb-sep{color:var(--line);font-size:11px}
.breadcrumb [aria-current="page"]{color:var(--cyan)}

/* ---------- 10. 网格 ---------- */
.grid-12{
  display:grid;
  grid-template-columns:repeat(12,minmax(0,1fr));
  gap:var(--gap);
}
.span-2{grid-column:span 2}
.span-3{grid-column:span 3}
.span-4{grid-column:span 4}
.span-5{grid-column:span 5}
.span-6{grid-column:span 6}
.span-7{grid-column:span 7}
.span-8{grid-column:span 8}
.span-9{grid-column:span 9}
.span-12{grid-column:span 12}

/* ---------- 11. 基础组件 ---------- */
.panel{
  position:relative;
  background:linear-gradient(180deg, rgba(16,27,47,.92), rgba(13,21,38,.92));
  border:1px solid var(--line);
  border-radius:var(--radius);
  box-shadow:var(--shadow-panel);
}
.panel-head{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:14px;
  padding:14px 18px;
  border-bottom:1px solid var(--line-soft);
}
.panel-title{
  font-family:var(--font-display);
  font-size:15px;
  font-weight:700;
  letter-spacing:.1em;
  text-transform:uppercase;
  color:var(--fog);
}
.panel-body{padding:18px}

.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:3px 9px;
  border:1px solid var(--line);
  border-radius:2px;
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--ink-dim);
  white-space:nowrap;
}
.tag--cyan{color:var(--cyan);border-color:rgba(50,230,208,.42);background:rgba(50,230,208,.08)}
.tag--flame{color:var(--flame);border-color:rgba(255,90,60,.44);background:rgba(255,90,60,.09)}
.tag--mint{color:var(--mint);border-color:rgba(91,227,138,.42);background:rgba(91,227,138,.08)}
.tag--live::before{
  content:"";
  width:6px;height:6px;
  border-radius:50%;
  background:currentColor;
  box-shadow:0 0 10px currentColor;
  animation:tagPulse 1.9s var(--ease) infinite;
}
@keyframes tagPulse{0%,100%{opacity:1}50%{opacity:.32}}

.score{
  display:inline-flex;
  align-items:baseline;
  gap:6px;
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  font-weight:600;
  color:var(--ink);
  line-height:1;
}
.score-num{font-size:clamp(28px,3.6vw,46px);letter-spacing:-.02em}
.score-sep{font-size:.62em;color:var(--ink-dim)}
.score--flame .score-num{color:var(--flame)}
.score--cyan .score-num{color:var(--cyan)}

.frame{
  position:relative;
  overflow:hidden;
  border:1px solid var(--line);
  border-radius:var(--radius);
  aspect-ratio:16 / 9;
  background:
    radial-gradient(120% 100% at 18% 0%, rgba(50,230,208,.14), transparent 62%),
    radial-gradient(100% 90% at 100% 100%, rgba(255,90,60,.10), transparent 66%),
    linear-gradient(160deg, #0D1526, #070B14);
}
.frame::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background-image:
    linear-gradient(to right, var(--line-soft) 1px, transparent 1px),
    linear-gradient(to bottom, var(--line-soft) 1px, transparent 1px);
  background-size:clamp(32px,4vw,56px) clamp(32px,4vw,56px);
  opacity:.5;
}
.frame img,
.frame picture,
.frame picture > img{
  position:relative;
  z-index:1;
  width:100%;
  height:100%;
  object-fit:cover;
}
.frame > img{display:block}
.frame--wide{aspect-ratio:21 / 9}
.frame--tall{aspect-ratio:3 / 4}
.frame--square{aspect-ratio:1 / 1}
.frame-caption{
  position:absolute;
  left:0;right:0;bottom:0;
  z-index:2;
  padding:10px 14px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.12em;
  text-transform:uppercase;
  color:var(--fog);
  background:linear-gradient(180deg, transparent, rgba(7,11,20,.94));
}

/* 滚动显现 */
.js [data-reveal]{
  opacity:0;
  transform:translateY(14px);
  transition:opacity .6s var(--ease), transform .6s var(--ease);
}
.js [data-reveal].is-revealed{
  opacity:1;
  transform:none;
}

/* ---------- 12. 响应式 ---------- */
@media (max-width:1079px){
  .site-header{--h:68px}
  .header-actions .btn-ghost{display:none}
  .nav-toggle{display:inline-flex}

  .site-nav{
    position:fixed;
    inset:auto 0 0 0;
    z-index:120;
    display:block;
    justify-content:flex-start;
    max-height:min(78vh,580px);
    overflow-y:auto;
    padding:22px var(--gutter) calc(26px + env(safe-area-inset-bottom));
    background:linear-gradient(180deg, rgba(16,27,47,.99), rgba(7,11,20,.99));
    border-top:1px solid var(--line);
    box-shadow:0 -44px 86px -46px #000;
    transform:translateY(104%);
    visibility:hidden;
    transition:transform .34s var(--ease), visibility .34s var(--ease);
  }
  .site-nav[data-open="true"]{transform:translateY(0);visibility:visible}
  .nav-list{flex-direction:column;align-items:stretch;gap:0}
  .nav-list li{border-bottom:1px solid var(--line-soft)}
  .nav-list li:last-child{border-bottom:0}
  .nav-link{
    width:100%;
    padding:15px 2px;
    font-size:16px;
    align-items:center;
    gap:12px;
    justify-content:flex-start;
  }
  .nav-link::after{display:none}
  .nav-link[aria-current="page"]{color:var(--cyan)}
  .nav-index{font-size:11px}
  .nav-foot{display:block;margin-top:18px;line-height:1.8}

  body[data-nav-open="true"]{overflow:hidden}
  body::after{
    content:"";
    position:fixed;
    inset:0;
    z-index:90;
    pointer-events:none;
    background:rgba(4,7,13,.62);
    opacity:0;
    transition:opacity .3s var(--ease);
  }
  body[data-nav-open="true"]::after{opacity:1}

  .footer-top{grid-template-columns:minmax(0,1fr) minmax(0,1.35fr)}
  .footer-contact{grid-column:1 / -1}

  .grid-12{grid-template-columns:repeat(8,minmax(0,1fr))}
  .span-2,.span-3,.span-4,.span-5{grid-column:span 4}
  .span-6,.span-7,.span-8,.span-9,.span-12{grid-column:span 8}
}

@media (max-width:679px){
  :root{--header-h:66px}
  body{font-size:15.5px}
  .brand-tag{display:none}
  .brand-name{font-size:17px}
  .brand-mark{width:30px;height:30px}
  .header-actions{gap:8px}
  .header-actions .btn-primary{padding:9px 13px;font-size:12.5px;letter-spacing:.04em}
  .nav-toggle{padding:8px 11px}
  .nav-toggle-text{display:none}

  .footer-cols{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-top{grid-template-columns:1fr}
  .footer-bottom{flex-direction:column;align-items:flex-start;gap:14px}

  .grid-12{grid-template-columns:repeat(4,minmax(0,1fr))}
  .span-2,.span-3,.span-4,.span-5,.span-6,.span-7,.span-8,.span-9,.span-12{grid-column:span 4}
  .section{padding-block:clamp(36px,9vw,60px)}
}

/* ---------- 13. 减少动效 ---------- */
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .js [data-reveal]{opacity:1;transform:none}
  .nav-link:hover,.footer-links a:hover{transform:none}
  .header-progress > span{box-shadow:none}
}