/* ==========================================================================
   加加体育 · 共享站点样式  /assets/site.css
   夜场数据板：低明度夜场底 + 草皮绿结构色 + 哨声橙关键值
   ========================================================================== */

/* ---------- 1. 设计令牌 ---------- */
:root{
  --night:#0A1418;
  --night-soft:#0E1E24;
  --pitch-deep:#0B6E4F;
  --pitch-bright:#12A06B;
  --whistle:#FF6B35;
  --data-blue:#1B4F72;
  --stoppage:#C0392B;
  --loess:#E8D9B5;
  --qin:#14524A;

  --ink:#F2F7F4;
  --ink-dim:#9FB3AC;
  --ink-mute:#6E847D;

  --glass:rgba(255,255,255,.08);
  --glass-strong:rgba(255,255,255,.14);
  --line:rgba(242,247,244,.12);
  --line-strong:rgba(18,160,107,.42);

  --radius-sm:10px;
  --radius-md:14px;
  --radius-lg:22px;
  --radius-pill:999px;

  --shell:1240px;
  --gutter:40px;
  --gap:24px;

  --font-head:"Source Han Sans SC","Source Han Sans CN","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --font-body:"Source Han Serif SC","Noto Serif SC","Songti SC","SimSun",serif;
  --font-num:"Barlow Condensed","Oswald","DIN Condensed","Arial Narrow","PingFang SC",sans-serif;
  --font-mono:"IBM Plex Mono","Roboto Mono","SFMono-Regular","Consolas","Courier New",monospace;

  --shadow-soft:0 18px 46px -26px rgba(0,0,0,.9);
  --shadow-whistle:0 12px 28px -14px rgba(255,107,53,.72);
}

/* ---------- 2. Reset 与基础排版 ---------- */
*,*::before,*::after{box-sizing:border-box}

html{
  background:var(--night);
  scroll-behavior:smooth;
  -webkit-text-size-adjust:100%;
}

body{
  margin:0;
  min-height:100vh;
  background:transparent;
  color:var(--ink);
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

/* 夜场底纹：灯光晕影 + 草皮网格 */
body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:-1;
  pointer-events:none;
  background:
    radial-gradient(760px 440px at 82% -10%, rgba(11,110,79,.30), transparent 68%),
    radial-gradient(560px 380px at 4% 6%, rgba(27,79,114,.28), transparent 70%),
    repeating-linear-gradient(90deg, rgba(242,247,244,.018) 0 1px, transparent 1px 88px),
    repeating-linear-gradient(0deg, rgba(242,247,244,.014) 0 1px, transparent 1px 88px);
}

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

button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer;background:none;border:0}

ul,ol{margin:0 0 1em;padding-left:1.2em}

h1,h2,h3,h4,h5,h6{
  margin:0 0 .62em;
  font-family:var(--font-head);
  font-weight:800;
  line-height:1.18;
  letter-spacing:-.01em;
  color:var(--ink);
}
h1{font-size:clamp(30px,4.4vw,40px)}
h2{font-size:clamp(23px,2.8vw,28px)}
h3{font-size:21px}
h4{font-size:18px}

p{margin:0 0 1.05em}
p:last-child{margin-bottom:0}
strong,b{font-weight:700;color:#FFFFFF}
small{font-size:13px}

a{
  color:var(--pitch-bright);
  text-decoration:none;
  transition:color .2s ease,opacity .2s ease;
}
a:hover{color:var(--whistle)}

::selection{background:var(--whistle);color:#0A1418}

:focus-visible{
  outline:2px solid var(--whistle);
  outline-offset:3px;
  border-radius:8px;
}

/* ---------- 3. 通用工具 ---------- */
.shell{
  width:100%;
  max-width:var(--shell);
  margin-inline:auto;
  padding-inline:var(--gutter);
}

.section{padding-block:clamp(46px,6.5vw,86px)}
.section-tight{padding-block:clamp(26px,4vw,48px)}

.visually-hidden{
  position:absolute!important;
  width:1px;height:1px;
  margin:-1px;padding:0;
  overflow:hidden;
  clip:rect(0 0 0 0);
  white-space:nowrap;
  border:0;
}

.skip-link{
  position:fixed;
  top:-90px;
  left:50%;
  transform:translateX(-50%);
  z-index:200;
  padding:12px 22px;
  border-radius:var(--radius-pill);
  background:var(--whistle);
  color:#0A1418;
  font-family:var(--font-head);
  font-size:15px;
  font-weight:700;
  letter-spacing:.03em;
  box-shadow:var(--shadow-whistle);
  transition:top .22s ease;
}
.skip-link:focus{top:14px;color:#0A1418}

/* ---------- 4. 浮岛页头 ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:80;
  padding:16px var(--gutter) 12px;
  transition:padding .28s ease;
}
.site-header.is-condensed{padding:8px var(--gutter) 6px}

.header-inner{
  position:relative;
  display:flex;
  align-items:center;
  gap:22px;
  width:100%;
  max-width:var(--shell);
  margin-inline:auto;
  padding:10px 12px 10px 20px;
  border-radius:var(--radius-pill);
  background:rgba(10,20,24,.72);
  border:1px solid var(--line);
  box-shadow:var(--shadow-soft);
  backdrop-filter:blur(16px) saturate(140%);
  -webkit-backdrop-filter:blur(16px) saturate(140%);
  transition:padding .28s ease,background .28s ease,border-color .28s ease;
}
.site-header.is-condensed .header-inner{
  padding:6px 10px 6px 16px;
  background:rgba(10,20,24,.9);
  border-color:var(--line-strong);
}

/* 品牌印章 */
.brand{
  display:flex;
  align-items:center;
  gap:11px;
  flex:0 0 auto;
  color:var(--ink);
  text-decoration:none;
}
.brand:hover{color:var(--ink)}

.brand-mark{
  position:relative;
  width:34px;
  height:34px;
  flex:none;
  border-radius:11px;
  background:linear-gradient(150deg,var(--pitch-bright),var(--pitch-deep) 62%,var(--data-blue));
  box-shadow:0 0 0 1px rgba(18,160,107,.45), 0 10px 22px -12px rgba(18,160,107,.9);
}
.brand-mark::before,
.brand-mark::after{
  content:"";
  position:absolute;
  left:9px;
  height:3px;
  border-radius:2px;
  background:rgba(10,20,24,.55);
}
.brand-mark::before{top:11px;right:9px}
.brand-mark::after{top:19px;right:14px}

.brand-text{display:flex;flex-direction:column;gap:3px;line-height:1.1}
.brand-name{
  font-family:var(--font-head);
  font-size:18px;
  font-weight:900;
  letter-spacing:.06em;
  color:var(--ink);
}
.brand-tag{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.08em;
  color:var(--ink-dim);
  white-space:nowrap;
}
.brand-footer .brand-mark{width:40px;height:40px;border-radius:13px}
.brand-footer .brand-name{font-size:20px}
.brand-footer .brand-tag{font-size:11.5px}

/* 胶囊导航 */
.site-nav{display:flex;align-items:center;margin-left:auto}
.nav-list{display:flex;align-items:center;gap:2px;list-style:none;margin:0;padding:0}

.nav-link{
  position:relative;
  display:inline-block;
  padding:9px 15px;
  border-radius:var(--radius-pill);
  font-family:var(--font-head);
  font-size:15px;
  font-weight:700;
  letter-spacing:.02em;
  color:var(--ink-dim);
  text-decoration:none;
  transition:color .2s ease,background .2s ease;
}
.nav-link:hover{color:var(--ink);background:var(--glass)}
.nav-link[aria-current="page"]{
  color:var(--ink);
  background:rgba(11,110,79,.5);
  box-shadow:inset 0 0 0 1px rgba(18,160,107,.5);
}
.nav-link[aria-current="page"]::after{
  content:"";
  position:absolute;
  left:50%;
  bottom:3px;
  width:14px;
  height:2px;
  margin-left:-7px;
  border-radius:2px;
  background:var(--whistle);
}

.header-actions{display:flex;align-items:center;gap:10px;flex:0 0 auto}
.header-cta{padding:10px 18px;font-size:14.5px}

/* 汉堡按钮 */
.nav-toggle{
  display:none;
  align-items:center;
  gap:9px;
  padding:9px 15px;
  border-radius:var(--radius-pill);
  background:var(--glass);
  border:1px solid var(--line);
  color:var(--ink);
  font-family:var(--font-head);
  font-size:14px;
  font-weight:700;
  letter-spacing:.04em;
  transition:background .2s ease,border-color .2s ease;
}
.nav-toggle:hover{background:var(--glass-strong);border-color:var(--line-strong)}
.nav-toggle-bars{display:inline-flex;flex-direction:column;justify-content:center;gap:4px;width:16px;height:12px}
.nav-toggle-bars i{display:block;height:2px;border-radius:2px;background:var(--ink);transition:transform .24s ease}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars i:first-child{transform:translateY(3px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars i:last-child{transform:translateY(-3px) rotate(-45deg)}

/* 滚动进度线 */
.header-progress{
  position:absolute;
  left:0;
  right:0;
  bottom:0;
  height:2px;
  transform:scaleX(0);
  transform-origin:0 50%;
  background:linear-gradient(90deg,var(--pitch-bright),var(--whistle) 68%,var(--stoppage));
  transition:transform .12s linear;
  pointer-events:none;
}

/* ---------- 5. 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:11px 20px;
  border:1px solid transparent;
  border-radius:var(--radius-pill);
  font-family:var(--font-head);
  font-size:15px;
  font-weight:700;
  letter-spacing:.02em;
  text-decoration:none;
  cursor:pointer;
  transition:transform .2s ease,background .2s ease,color .2s ease,border-color .2s ease,box-shadow .2s ease;
}
.btn-whistle{background:var(--whistle);color:#0A1418;box-shadow:var(--shadow-whistle)}
.btn-whistle:hover{background:#FF8455;color:#0A1418;transform:translateY(-2px)}
.btn-pitch{
  background:var(--pitch-deep);
  color:var(--ink);
  box-shadow:inset 0 0 0 1px rgba(18,160,107,.6);
}
.btn-pitch:hover{background:var(--pitch-bright);color:#06231B;transform:translateY(-2px)}
.btn-ghost{background:var(--glass);color:var(--ink);border-color:var(--line)}
.btn-ghost:hover{background:var(--glass-strong);color:var(--ink);border-color:var(--line-strong);transform:translateY(-2px)}
.btn-sm{padding:8px 15px;font-size:14px}

/* ---------- 6. 页脚 ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(56px,8vw,110px);
  border-top:1px solid var(--line);
  color:var(--ink);
  background:
    radial-gradient(900px 420px at 14% 0%, rgba(11,110,79,.34), transparent 66%),
    radial-gradient(700px 360px at 96% 12%, rgba(20,82,74,.5), transparent 70%),
    linear-gradient(180deg,#0C1B21 0%,#091418 65%,#0A1418 100%);
}
.site-footer::before{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background:repeating-linear-gradient(90deg, rgba(242,247,244,.02) 0 1px, transparent 1px 96px);
}

.footer-shell{
  position:relative;
  z-index:1;
  width:100%;
  max-width:var(--shell);
  margin-inline:auto;
  padding:clamp(48px,6vw,76px) var(--gutter) clamp(32px,4vw,48px);
  display:grid;
  grid-template-columns:minmax(240px,1fr) minmax(0,2.35fr);
  gap:clamp(32px,4vw,64px);
}

.footer-brand{display:flex;flex-direction:column;gap:18px}

.footer-note{
  margin:0;
  max-width:34ch;
  font-size:15px;
  line-height:1.7;
  color:var(--ink-dim);
}

.footer-coords{
  list-style:none;
  margin:0;
  padding:2px 0 2px 14px;
  display:grid;
  gap:8px;
  border-left:2px solid rgba(18,160,107,.5);
}
.footer-coords li{display:flex;align-items:baseline;gap:10px;font-family:var(--font-mono);font-size:13px}

.coord-key{color:var(--ink-mute);letter-spacing:.1em}
.coord-val{color:var(--ink);overflow-wrap:anywhere}

.footer-columns{
  display:grid;
  grid-template-columns:repeat(4,minmax(0,1fr));
  gap:clamp(20px,2.4vw,34px);
}

.footer-col-title{
  display:flex;
  align-items:center;
  gap:9px;
  margin:0 0 16px;
  font-family:var(--font-head);
  font-size:13px;
  font-weight:800;
  letter-spacing:.18em;
  color:var(--ink-dim);
  text-transform:uppercase;
}
.footer-col-title::before{
  content:"";
  width:14px;
  height:2px;
  border-radius:2px;
  flex:none;
  background:var(--pitch-bright);
}

.footer-links{list-style:none;margin:0;padding:0;display:grid;gap:11px}
.footer-links a{
  font-family:var(--font-head);
  font-size:15px;
  font-weight:500;
  letter-spacing:.01em;
  color:var(--ink);
  opacity:.78;
  text-decoration:none;
}
.footer-links a:hover{opacity:1;color:var(--whistle)}

.footer-facts{
  list-style:none;
  margin:0;
  padding:0;
  display:grid;
  gap:12px;
  font-family:var(--font-mono);
  font-size:13px;
  line-height:1.6;
}
.footer-facts li{display:block}
.footer-facts .coord-key{display:block;font-size:12px;letter-spacing:.12em}
.footer-facts .coord-val{display:block;color:var(--ink)}

.footer-base{
  position:relative;
  z-index:1;
  width:100%;
  max-width:var(--shell);
  margin-inline:auto;
  padding:20px var(--gutter) 30px;
  border-top:1px solid var(--line);
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:12px 26px;
  font-family:var(--font-mono);
  font-size:12.5px;
  letter-spacing:.03em;
  color:var(--ink-dim);
}
.footer-copy,.footer-contact{margin:0}
.footer-legal-links{
  list-style:none;
  margin:0 0 0 auto;
  padding:0;
  display:flex;
  flex-wrap:wrap;
  gap:18px;
}
.footer-legal-links a{color:var(--ink-dim)}
.footer-legal-links a:hover{color:var(--whistle)}

/* ---------- 7. 面包屑与内容骨架 ---------- */
.breadcrumb{margin:0 0 22px}
.breadcrumb ol{
  list-style:none;
  margin:0;
  padding:0;
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  font-family:var(--font-mono);
  font-size:13px;
  color:var(--ink-dim);
}
.breadcrumb li{display:flex;align-items:center;gap:8px}
.breadcrumb li + li::before{content:"/";color:rgba(159,179,172,.45)}
.breadcrumb a{color:var(--ink-dim)}
.breadcrumb a:hover{color:var(--whistle)}
.breadcrumb [aria-current="page"]{color:var(--ink)}

.prose{max-width:70ch;font-size:17px;line-height:1.85}
.prose p{color:rgba(242,247,244,.86)}

.section-head{
  display:flex;
  flex-wrap:wrap;
  align-items:flex-end;
  gap:18px;
  margin-bottom:clamp(24px,3vw,38px);
}
.section-head-text{flex:1 1 320px}
.section-title{margin:0;font-size:clamp(23px,2.8vw,28px)}
.section-sub{margin:6px 0 0;max-width:62ch;font-size:16px;color:var(--ink-dim)}

.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:10px;
  margin:0 0 14px;
  font-family:var(--font-head);
  font-size:12px;
  font-weight:700;
  letter-spacing:.22em;
  text-transform:uppercase;
  color:var(--pitch-bright);
}
.eyebrow::before{
  content:"";
  width:22px;
  height:2px;
  border-radius:2px;
  background:var(--whistle);
}

.coord-row{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:18px}

.coord-tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:4px 11px;
  border-radius:var(--radius-pill);
  border:1px solid var(--line);
  background:var(--glass);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.06em;
  color:var(--ink-dim);
}
.coord-tag b{color:var(--whistle);font-weight:700}

.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:4px 11px;
  border-radius:var(--radius-pill);
  border:1px solid rgba(18,160,107,.45);
  background:rgba(11,110,79,.32);
  color:#BDF3DE;
  font-family:var(--font-head);
  font-size:12px;
  font-weight:700;
  letter-spacing:.08em;
}
.tag.is-live{background:rgba(192,57,43,.24);border-color:rgba(192,57,43,.55);color:#F7C6BF}
.tag.is-whistle{background:rgba(255,107,53,.18);border-color:rgba(255,107,53,.5);color:#FFC7AF}

/* ---------- 8. 网格 ---------- */
.grid{display:grid;gap:var(--gap)}
.grid-2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid-asym{grid-template-columns:minmax(0,7fr) minmax(0,5fr)}
.grid-asym-rev{grid-template-columns:minmax(0,5fr) minmax(0,7fr)}

/* ---------- 9. 卡片与数据组件 ---------- */
.glass-card{
  position:relative;
  padding:clamp(18px,2.2vw,26px);
  border-radius:var(--radius-lg);
  background:var(--glass);
  border:1px solid var(--line);
  backdrop-filter:blur(12px);
  -webkit-backdrop-filter:blur(12px);
  transition:transform .26s ease,background .26s ease,border-color .26s ease;
}
.glass-card:hover{
  transform:translateY(-4px);
  background:var(--glass-strong);
  border-color:var(--line-strong);
}

.solid-card{
  position:relative;
  padding:clamp(18px,2.2vw,26px);
  border-radius:var(--radius-lg);
  background:linear-gradient(160deg,#0F2620,#0B1A20 70%);
  border:1px solid var(--line);
  box-shadow:var(--shadow-soft);
}

.stat-tile{
  display:flex;
  flex-direction:column;
  gap:6px;
  padding:16px 18px;
  border-radius:var(--radius-md);
  background:rgba(27,79,114,.22);
  border:1px solid var(--line);
}
.stat-value{
  font-family:var(--font-num);
  font-size:56px;
  font-weight:800;
  line-height:.95;
  letter-spacing:-.02em;
  font-variant-numeric:tabular-nums;
  color:var(--ink);
}
.stat-value.is-lg{font-size:clamp(44px,6vw,72px)}
.stat-value.is-xl{font-size:clamp(56px,9vw,96px)}
.stat-value.is-whistle{color:var(--whistle)}
.stat-value.is-red{color:var(--stoppage)}
.stat-value.is-pitch{color:var(--pitch-bright)}
.stat-unit{font-family:var(--font-num);font-size:22px;color:var(--ink-dim);margin-left:2px}
.stat-label{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--ink-dim);
}

.meter{display:grid;gap:8px}
.meter-track{
  position:relative;
  height:10px;
  border-radius:var(--radius-pill);
  background:rgba(255,255,255,.09);
  overflow:hidden;
}
.meter-fill{
  position:absolute;
  top:0;bottom:0;left:0;
  border-radius:var(--radius-pill);
  background:linear-gradient(90deg,var(--pitch-deep),var(--pitch-bright));
  transition:width .8s cubic-bezier(.2,.75,.3,1);
}
.meter-fill.is-whistle{background:linear-gradient(90deg,var(--stoppage),var(--whistle))}
.meter-value{
  font-family:var(--font-num);
  font-size:28px;
  font-weight:800;
  font-variant-numeric:tabular-nums;
  color:var(--ink);
}

.legend{
  list-style:none;
  margin:0;
  padding:16px 18px;
  display:grid;
  gap:10px;
  background:var(--glass);
  border:1px solid var(--line);
  border-radius:var(--radius-md);
}
.legend li{display:flex;align-items:center;gap:10px;font-size:14px;color:var(--ink-dim)}
.legend-key{width:12px;height:12px;flex:none;border-radius:3px;background:var(--pitch-bright)}
.legend-key.is-whistle{background:var(--whistle)}
.legend-key.is-blue{background:var(--data-blue)}
.legend-key.is-red{background:var(--stoppage)}
.legend-key.is-loess{background:var(--loess)}

.timeline{list-style:none;margin:0;padding:0}
.timeline-item{
  position:relative;
  padding:0 0 22px 26px;
  border-left:1px solid var(--line);
}
.timeline-item::before{
  content:"";
  position:absolute;
  left:-5px;
  top:6px;
  width:9px;
  height:9px;
  border-radius:50%;
  background:var(--night);
  border:2px solid var(--pitch-bright);
}
.timeline-item.is-stoppage::before{border-color:var(--stoppage)}
.timeline-item:last-child{border-left-color:transparent;padding-bottom:0}
.timeline-time{
  display:block;
  font-family:var(--font-mono);
  font-size:13px;
  letter-spacing:.08em;
  color:var(--whistle);
}

/* ---------- 10. 图片容器（页面阶段放置 <img>） ---------- */
.img-frame{
  position:relative;
  display:block;
  overflow:hidden;
  isolation:isolate;
  border-radius:var(--radius-md);
  border:1px solid var(--line);
  background:
    radial-gradient(120% 90% at 20% 0%, rgba(18,160,107,.28), transparent 62%),
    linear-gradient(160deg,#0E2B27,#0A181E 70%);
}
.img-frame img{width:100%;height:100%;object-fit:cover}
.img-frame::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background:linear-gradient(180deg,rgba(10,20,24,0) 42%,rgba(10,20,24,.72) 100%);
}
.img-frame.is-plain::after{display:none}
.img-frame.is-contained img{object-fit:contain;padding:14px}
.img-cap{
  margin:10px 0 0;
  font-family:var(--font-mono);
  font-size:12.5px;
  letter-spacing:.04em;
  color:var(--ink-dim);
}
.ratio-21-9{aspect-ratio:21/9}
.ratio-16-9{aspect-ratio:16/9}
.ratio-4-3{aspect-ratio:4/3}
.ratio-1-1{aspect-ratio:1/1}
.ratio-3-4{aspect-ratio:3/4}

/* ---------- 11. 浮标：返回顶部 ---------- */
.to-top{
  position:fixed;
  right:calc(var(--gutter) * .6);
  bottom:28px;
  z-index:70;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  width:46px;
  height:46px;
  border-radius:50%;
  background:rgba(10,20,24,.86);
  border:1px solid var(--line);
  color:var(--ink);
  font-size:18px;
  backdrop-filter:blur(12px);
  -webkit-backdrop-filter:blur(12px);
  opacity:0;
  visibility:hidden;
  transform:translateY(12px);
  transition:opacity .26s ease,transform .26s ease,visibility .26s ease,border-color .2s ease,color .2s ease;
}
.to-top.is-visible{opacity:1;visibility:visible;transform:none}
.to-top:hover{border-color:var(--whistle);color:var(--whistle)}

/* ---------- 12. 进入视口渐显 ---------- */
html.has-js [data-reveal]{
  opacity:0;
  transform:translateY(18px);
  transition:opacity .55s ease,transform .55s cubic-bezier(.2,.75,.3,1);
}
html.has-js [data-reveal].is-in{opacity:1;transform:translateY(0)}

/* 章节目录高亮 */
[data-toc-link][aria-current]{
  color:var(--whistle);
  font-weight:700;
}

/* ---------- 13. 响应式 ---------- */
@media (max-width:1200px){
  .grid-3{grid-template-columns:repeat(2,minmax(0,1fr))}
}

@media (max-width:1080px){
  :root{--gutter:28px}

  .site-nav{
    position:absolute;
    left:0;
    right:0;
    top:calc(100% + 10px);
    margin:0;
    flex-direction:column;
    align-items:stretch;
    padding:14px;
    border-radius:var(--radius-lg);
    background:rgba(8,17,21,.97);
    border:1px solid var(--line);
    box-shadow:var(--shadow-soft);
    backdrop-filter:blur(18px);
    -webkit-backdrop-filter:blur(18px);
    max-height:0;
    opacity:0;
    visibility:hidden;
    overflow:hidden;
    transition:max-height .32s ease,opacity .24s ease,visibility .32s ease;
  }
  .site-nav[data-open]{
    max-height:min(74vh,560px);
    opacity:1;
    visibility:visible;
    overflow-y:auto;
  }

  .nav-list{flex-direction:column;align-items:stretch;gap:4px}
  .nav-link{
    display:block;
    padding:13px 16px;
    border-radius:var(--radius-md);
    font-size:16px;
    color:var(--ink);
  }
  .nav-link[aria-current="page"]::after{
    left:6px;
    top:50%;
    bottom:auto;
    width:3px;
    height:18px;
    margin:-9px 0 0;
  }

  .nav-toggle{display:inline-flex}

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

  .grid-2,.grid-3,.grid-asym,.grid-asym-rev{grid-template-columns:minmax(0,1fr)}
}

@media (max-width:640px){
  :root{--gutter:18px}

  body{font-size:16px}

  .site-header{padding:10px var(--gutter) 8px}
  .header-inner{padding:8px 8px 8px 14px;gap:12px}
  .brand-mark{width:30px;height:30px;border-radius:10px}
  .brand-mark::before{top:10px}
  .brand-mark::after{top:17px}
  .brand-name{font-size:16px}
  .brand-tag{display:none}
  .header-cta{padding:9px 13px;font-size:13.5px}
  .nav-toggle{padding:9px 12px}
  .nav-toggle-text{display:none}

  .footer-columns{grid-template-columns:minmax(0,1fr)}
  .footer-base{flex-direction:column;align-items:flex-start;gap:10px}
  .footer-legal-links{margin-left:0;gap:14px}

  .to-top{right:14px;bottom:18px;width:42px;height:42px}
}

/* ---------- 14. 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;
  }
  html.has-js [data-reveal]{opacity:1;transform:none;transition:none}
  .glass-card:hover,.btn:hover{transform:none}
  .to-top{transform:none}
}