/* ============================================================
   B体育 · 共享外壳样式 /assets/site.css
   深墨蓝数据台 · 荧光青与信号橙高亮 · 锐利直角 · 精密网格
   ============================================================ */

/* ---------- 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,dl,dt,dd,figure,blockquote{margin:0;padding:0}
h1,h2,h3,h4,h5,h6{font-size:inherit;font-weight:inherit}
ul,ol{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%}
input,select{font:inherit}
::selection{background:var(--cyan);color:var(--ink)}

/* ---------- 2. 变量 ---------- */
:root{
  --ink:#0B1220;
  --ink-2:#111E33;
  --ink-3:#080E18;
  --cyan:#00E5D4;
  --orange:#FF6B35;
  --turf:#2E7D5B;
  --indigo:#3D2C8D;
  --wine:#7A2E3A;
  --white:#F7FAFC;
  --mist:#E8EDF5;
  --line:#1F2937;
  --hair:rgba(232,237,245,.13);
  --hair-strong:rgba(232,237,245,.26);
  --muted:rgba(232,237,245,.66);
  --faint:rgba(232,237,245,.44);

  --font-head:"Archivo Narrow","Arial Narrow","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-body:system-ui,-apple-system,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",sans-serif;
  --font-mono:ui-monospace,"SFMono-Regular","Consolas","Liberation Mono","Menlo",monospace;

  --shell:1440px;
  --gap:24px;
  --radius:0;
  --header-h:118px;
}

/* ---------- 3. 基础排版（中文优先） ---------- */
body{
  background:var(--ink);
  color:var(--mist);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.7;
  letter-spacing:.01em;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4{color:var(--white);font-family:var(--font-head);font-weight:700;line-height:1.2;letter-spacing:.05em}
h1{font-size:clamp(30px,4.6vw,58px)}
h2{font-size:clamp(22px,2.6vw,34px)}
h3{font-size:clamp(17px,1.6vw,22px)}
p{color:var(--mist)}
strong{color:var(--white);font-weight:700}
.mono,.num{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.01em}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px}
#main-content{display:block;scroll-margin-top:140px}

/* ---------- 4. 容器与网格 ---------- */
.wrap{width:min(var(--shell),100% - 48px);margin-inline:auto}
.wrap--narrow{width:min(880px,100% - 48px);margin-inline:auto}
.grid{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:var(--gap)}
.col-3{grid-column:span 3}
.col-4{grid-column:span 4}
.col-5{grid-column:span 5}
.col-6{grid-column:span 6}
.col-7{grid-column:span 7}
.col-8{grid-column:span 8}
.col-9{grid-column:span 9}
.col-12{grid-column:span 12}
.rule{height:1px;background:var(--hair);border:0}

/* ---------- 5. 跳过链接 ---------- */
.skip-link{
  position:fixed;left:16px;top:-64px;z-index:200;
  display:inline-block;padding:11px 18px;
  background:var(--cyan);color:var(--ink);
  font-size:13px;font-weight:700;letter-spacing:.12em;
  transition:top .18s ease;
}
.skip-link:focus{top:10px}

/* ---------- 6. 通用按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 18px;border:1px solid transparent;border-radius:var(--radius);
  font-size:13px;font-weight:700;letter-spacing:.12em;line-height:1.2;
  text-align:center;transition:background .18s ease,color .18s ease,border-color .18s ease;
}
.btn--signal{background:var(--orange);color:var(--ink)}
.btn--signal:hover{background:#FF8757}
.btn--cyan{background:var(--cyan);color:var(--ink)}
.btn--cyan:hover{background:#4BF0E4}
.btn--ghost{border-color:var(--hair-strong);color:var(--mist)}
.btn--ghost:hover{border-color:var(--cyan);color:var(--cyan)}
.btn--block{width:100%}

/* ---------- 7. 头部 ---------- */
.site-header{
  position:sticky;top:0;z-index:80;
  background:var(--ink);
  border-bottom:1px solid var(--line);
}
.header-spectrum,
.footer-spectrum{
  display:block;height:3px;width:100%;
  background:linear-gradient(90deg,
    var(--cyan) 0 22%,
    var(--orange) 22% 44%,
    var(--turf) 44% 62%,
    var(--indigo) 62% 82%,
    var(--wine) 82% 100%);
}

/* 上层状态条 */
.header-utility{background:var(--ink-3);border-bottom:1px solid var(--hair)}
.header-utility .wrap{
  display:flex;align-items:center;justify-content:space-between;gap:20px;
  min-height:36px;
}
.util-note{
  display:flex;align-items:center;gap:9px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.11em;color:var(--muted);
}
.pulse{
  width:7px;height:7px;flex:0 0 auto;background:var(--cyan);
  animation:pulse 2.4s ease-in-out infinite;
}
@keyframes pulse{
  0%,100%{opacity:1;box-shadow:0 0 0 0 rgba(0,229,212,.5)}
  50%{opacity:.55;box-shadow:0 0 0 6px rgba(0,229,212,0)}
}
.util-links{display:flex;align-items:center;gap:18px}
.util-links a,
.util-phone{font-size:11px;letter-spacing:.1em;color:var(--faint);transition:color .18s ease}
.util-links a:hover{color:var(--cyan)}
.util-phone{color:var(--muted)}

/* 品牌层 */
.header-main .wrap{display:flex;align-items:center;gap:20px;min-height:80px;padding:12px 0}
.brand{display:flex;align-items:center;gap:13px;flex:0 0 auto}
.brand-mark{
  position:relative;width:44px;height:44px;flex:0 0 auto;
  display:grid;place-items:center;
  background:var(--ink-2);border:1px solid var(--cyan);
  color:var(--cyan);font-family:var(--font-head);font-weight:700;font-size:23px;line-height:1;
}
.brand-mark::after{content:"";position:absolute;right:-4px;top:-4px;width:8px;height:8px;background:var(--orange)}
.brand-text{display:flex;flex-direction:column;line-height:1.15}
.brand-name{font-family:var(--font-head);font-weight:700;font-size:20px;letter-spacing:.16em;color:var(--white)}
.brand-tag{margin-top:4px;font-size:11px;letter-spacing:.09em;color:var(--faint)}
.header-status{
  margin-left:auto;display:flex;align-items:center;gap:8px;
  padding:7px 11px;border:1px solid var(--hair);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;color:var(--cyan);
}
.header-status .dot{width:6px;height:6px;background:var(--cyan)}
.header-status .dot{animation:pulse 2.4s ease-in-out infinite}

/* 移动导航按钮 */
.nav-toggle{
  display:none;align-items:center;gap:10px;margin-left:auto;
  padding:11px 13px;border:1px solid var(--hair-strong);
  font-size:12px;font-weight:600;letter-spacing:.16em;color:var(--mist);
}
.nav-toggle:hover{border-color:var(--cyan);color:var(--cyan)}
.nav-toggle-bars{display:grid;gap:4px;width:18px}
.nav-toggle-bars i{display:block;height:2px;background:var(--cyan);transition:transform .2s ease,opacity .2s ease}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars i:nth-child(1){transform:translateY(6px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars i:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars i:nth-child(3){transform:translateY(-6px) rotate(-45deg)}

/* 下层栏目条 */
.site-nav{background:rgba(17,30,51,.6);border-top:1px solid var(--hair)}
.site-nav .wrap{display:flex;align-items:stretch;gap:20px}
.nav-list{display:flex;flex:1 1 auto;flex-wrap:wrap;min-width:0}
.nav-list li{display:flex}
.nav-list a{
  position:relative;display:flex;align-items:center;
  padding:14px 18px;
  font-size:14px;font-weight:600;letter-spacing:.12em;color:var(--mist);
  border-right:1px solid var(--hair);
  transition:background .18s ease,color .18s ease;
}
.nav-list li:first-child a{border-left:1px solid var(--hair)}
.nav-list a:hover{background:var(--ink-2);color:var(--cyan)}
.nav-list a[aria-current="page"]{background:var(--ink-2);color:var(--cyan)}
.nav-list a[aria-current="page"]::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:2px;background:var(--cyan);
}
.nav-cta{align-self:center;margin-block:10px;margin-left:auto;flex:0 0 auto}

/* 滚动进度 */
.scroll-progress{
  position:absolute;left:0;bottom:-1px;width:100%;height:2px;
  transform:scaleX(0);transform-origin:0 50%;
  background:linear-gradient(90deg,var(--cyan),var(--orange));
}

/* ---------- 8. 页脚 ---------- */
.site-footer{
  position:relative;margin-top:0;
  background:var(--ink-3);
  border-top:1px solid var(--line);
  color:var(--mist);
}
.footer-top{
  display:grid;grid-template-columns:minmax(0,1.5fr) repeat(3,minmax(0,1fr));
  gap:36px;padding:56px 0 44px;
}
.brand--footer{margin-bottom:18px}
.footer-desc{max-width:44ch;font-size:14px;color:var(--muted)}
.footer-tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:18px}
.footer-tags li{
  padding:4px 10px;border:1px solid var(--hair);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;color:var(--faint);
}
.footer-col h2{
  margin-bottom:16px;padding-bottom:10px;border-bottom:1px solid var(--hair);
  font-size:12px;letter-spacing:.22em;color:var(--cyan);font-weight:700;
}
.footer-col ul{display:grid;gap:10px}
.footer-col a{display:inline-block;font-size:14px;color:var(--muted);transition:color .18s ease,transform .18s ease}
.footer-col a:hover{color:var(--cyan);transform:translateX(4px)}
.contact-list{display:grid;gap:13px}
.contact-list li{display:grid;gap:3px}
.contact-list .label{font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;color:var(--faint)}
.contact-list .value{font-size:14px;color:var(--mist);line-height:1.5;word-break:break-word}
.footer-bottom{
  display:flex;flex-wrap:wrap;gap:12px 24px;align-items:center;justify-content:space-between;
  padding:18px 0 28px;border-top:1px solid var(--hair);
  font-size:12px;color:var(--faint);
}
.footer-legal{display:flex;flex-wrap:wrap;align-items:center;gap:10px}
.footer-legal a{color:var(--muted);transition:color .18s ease}
.footer-legal a:hover{color:var(--cyan)}
.sep{color:var(--line)}

/* ---------- 9. 面包屑 ---------- */
.crumbs{padding:22px 0 0}
.crumbs ol{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:var(--muted)}
.crumbs li{display:flex;align-items:center;gap:8px}
.crumbs li::after{content:"/";color:var(--line)}
.crumbs li:last-child::after{content:""}
.crumbs a:hover{color:var(--cyan)}
.crumbs [aria-current="page"]{color:var(--white)}

/* ---------- 10. 正文容器 ---------- */
.prose{max-width:74ch}
.prose h2{margin-top:38px;font-size:clamp(20px,2.2vw,28px)}
.prose h3{margin-top:26px;color:var(--cyan)}
.prose p{margin-top:16px}
.prose ul,.prose ol{margin-top:14px;display:grid;gap:9px}
.prose ul li{padding-left:18px;position:relative}
.prose ul li::before{content:"";position:absolute;left:0;top:.72em;width:8px;height:1px;background:var(--cyan)}
.prose a{color:var(--cyan);border-bottom:1px solid rgba(0,229,212,.42)}
.prose a:hover{border-bottom-color:var(--cyan)}

/* ---------- 11. 章节头 / 标签 / 数据瓦片 ---------- */
.sec-head{display:flex;flex-wrap:wrap;align-items:baseline;gap:14px;padding-bottom:14px;margin-bottom:28px;border-bottom:1px solid var(--hair)}
.sec-num{font-family:var(--font-mono);font-size:13px;letter-spacing:.18em;color:var(--orange)}
.sec-kicker{font-family:var(--font-mono);font-size:11px;letter-spacing:.2em;color:var(--faint);text-transform:uppercase}
.sec-title{flex:1 1 320px;font-family:var(--font-head);font-weight:700;font-size:clamp(20px,2.4vw,30px);letter-spacing:.05em;color:var(--white)}
.pill{display:inline-flex;align-items:center;gap:6px;padding:4px 10px;border:1px solid var(--hair-strong);font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;color:var(--muted)}
.pill--cyan{color:var(--cyan);border-color:rgba(0,229,212,.42)}
.pill--orange{color:var(--orange);border-color:rgba(255,107,53,.45)}
.pill--turf{color:#63C79C;border-color:rgba(46,125,91,.55)}
.data-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:1px;background:var(--hair);border:1px solid var(--hair)}
.data-grid > *{background:var(--ink-2);padding:18px}

/* ---------- 12. 图片容器（供页面阶段放置占位图） ---------- */
.media-frame{
  position:relative;display:block;width:100%;aspect-ratio:16/9;
  overflow:hidden;border:1px solid var(--hair);
  background-color:var(--ink-2);
  background-image:
    repeating-linear-gradient(90deg,rgba(0,229,212,.07) 0 1px,transparent 1px 46px),
    repeating-linear-gradient(0deg,rgba(232,237,245,.05) 0 1px,transparent 1px 46px);
}
.media-frame img,.media-frame video{width:100%;height:100%;object-fit:cover;filter:saturate(.72) contrast(1.05)}
.media-frame--wide{aspect-ratio:21/9}
.media-frame--tall{aspect-ratio:3/4}
.media-frame--square{aspect-ratio:1/1}
.media-frame figcaption{
  position:absolute;left:0;right:0;bottom:0;padding:12px 14px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;color:var(--mist);
  background:linear-gradient(180deg,rgba(8,14,24,0) 0%,rgba(8,14,24,.88) 100%);
}

/* ---------- 13. 滚动显现 ---------- */
html[data-reveal="on"] [data-reveal]{opacity:0;transform:translate3d(0,16px,0)}
html[data-reveal="on"] [data-reveal].is-in{
  opacity:1;transform:none;
  transition:opacity .5s ease,transform .55s cubic-bezier(.2,.7,.3,1);
  transition-delay:var(--reveal-delay,0ms);
}

/* ---------- 14. 响应式 ---------- */
@media (max-width:1080px){
  :root{--gap:20px}
  .footer-top{grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:32px}
  .footer-brand{grid-column:1 / -1}
}
@media (max-width:900px){
  .wrap,.wrap--narrow{width:min(var(--shell),100% - 32px)}
  .grid{grid-template-columns:repeat(6,minmax(0,1fr))}
  .col-3,.col-4{grid-column:span 3}
  .col-5,.col-6,.col-7,.col-8,.col-9,.col-12{grid-column:span 6}

  .header-status{display:none}
  .nav-toggle{display:inline-flex}
  .header-main .wrap{min-height:68px;gap:14px}
  .brand-mark{width:38px;height:38px;font-size:20px}
  .brand-name{font-size:18px;letter-spacing:.12em}
  .brand-tag{font-size:10px}

  .site-nav{display:none;background:var(--ink-2)}
  .site-nav[data-open]{display:block;animation:nav-in .18s ease-out}
  @keyframes nav-in{from{opacity:0;transform:translateY(-6px)}to{opacity:1;transform:none}}
  .site-nav .wrap{flex-direction:column;align-items:stretch;gap:0}
  .nav-list{flex-direction:column;width:100%}
  .nav-list a{
    padding:15px 4px;font-size:15px;letter-spacing:.1em;
    border-right:0;border-left:0;border-bottom:1px solid var(--hair);
  }
  .nav-list li:first-child a{border-left:0}
  .nav-list a[aria-current="page"]::after{left:0;right:0;height:2px}
  .nav-cta{align-self:stretch;margin:18px 0 22px;width:100%}
}
@media (max-width:700px){
  .util-links{display:none}
  .header-utility .wrap{justify-content:flex-start}
  .footer-top{grid-template-columns:minmax(0,1fr);padding:44px 0 34px}
  .footer-bottom{justify-content:flex-start}
  :root{--gap:16px}
}
@media (max-width:620px){
  .grid{grid-template-columns:1fr}
  .col-3,.col-4,.col-5,.col-6,.col-7,.col-8,.col-9,.col-12{grid-column:1 / -1}
  h1{font-size:clamp(26px,8vw,38px)}
  .footer-legal{font-size:11px}
}

/* ---------- 15. 动效与可访问性 ---------- */
@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[data-reveal="on"] [data-reveal]{opacity:1;transform:none}
  .scroll-progress{transition:none}
  .pulse,.header-status .dot{animation:none}
}