/* ============================================================
   Site Kit · B体育官网 · 夜场战术板 / 转播监视器
   /assets/site.css —— reset、变量、中文排版、共享头部页脚、通用组件
   ============================================================ */

/* ---------- reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;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}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer}
img,svg,video{display:block;max-width:100%;height:auto}
[hidden]{display:none !important}
table{border-collapse:collapse;width:100%}

/* ---------- tokens ---------- */
:root{
  --bg:#0B1F1A;
  --bg-deep:#0F2C25;
  --panel:#16382F;
  --ink:#E8F1EC;
  --ink-dim:#9DB3AA;
  --ink-soft:#6C877E;
  --cyan:#00F0C8;
  --orange:#FF6B2C;
  --violet:#6E4A86;
  --wine:#7E2B33;
  --gold:#C9A227;
  --line:#2A4A42;
  --rail-w:88px;
  --bar-h:58px;
  --maxw:1320px;
  --font-sans:"PingFang SC","Hiragino Sans GB","Source Han Sans SC","Noto Sans CJK SC","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,"Liberation Mono",monospace;
  --ease:cubic-bezier(.22,.61,.36,1);
  --pad-x:clamp(16px,3vw,44px);
}

/* ---------- base typography ---------- */
html{font-size:16px}
body{
  font-family:var(--font-sans);
  font-size:16.5px;
  line-height:1.75;
  color:var(--ink);
  background:var(--bg);
  padding-left:var(--rail-w);
  padding-top:var(--bar-h);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
::selection{background:var(--cyan);color:#04241D}

h1,h2,h3,h4{font-weight:300;letter-spacing:-.02em;line-height:1.1}
.display{font-size:clamp(38px,7.2vw,92px);font-weight:200;letter-spacing:-.025em;line-height:1.02}
h2,.h2{font-size:clamp(23px,3.2vw,38px);font-weight:800;letter-spacing:-.03em;line-height:1.14}
h3,.h3{font-size:clamp(17px,1.9vw,21px);font-weight:700;letter-spacing:-.01em;line-height:1.32}
h4,.h4{font-size:15px;font-weight:700;letter-spacing:0}
p{max-width:70ch}
strong{font-weight:700;color:var(--ink)}
small{font-size:12.5px;color:var(--ink-dim)}
hr,.rule{border:0;height:1px;background:var(--line);margin:0}

/* ---------- a11y ---------- */
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px}
.skip-link{
  position:fixed;top:8px;left:8px;z-index:200;
  transform:translateY(-180%);
  background:var(--cyan);color:#04241D;
  padding:10px 16px;font-size:13px;font-weight:700;border-radius:2px;
  transition:transform .18s var(--ease);
}
.skip-link:focus,.skip-link:focus-visible{transform:translateY(0)}

/* ---------- layout helpers ---------- */
.wrap{width:100%;max-width:var(--maxw);margin-inline:auto;padding-inline:var(--pad-x)}
.section{position:relative;padding-block:clamp(44px,6vw,96px)}
.section--deep{background:var(--bg-deep)}
.section--panel{background:var(--panel)}
.section--grid{background-image:linear-gradient(rgba(42,74,66,.55) 1px,transparent 1px),linear-gradient(90deg,rgba(42,74,66,.55) 1px,transparent 1px);background-size:44px 44px}
.grid12{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:clamp(16px,2.2vw,28px)}
.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-12{grid-column:span 12}
.stack{display:grid;gap:clamp(14px,1.8vw,24px)}
.page-head{padding-block:clamp(38px,5vw,74px) clamp(22px,3vw,36px);border-bottom:1px solid var(--line)}
.page-head__title{font-size:clamp(31px,5.6vw,72px);font-weight:200;letter-spacing:-.02em;line-height:1.03}
.page-head__lead{margin-top:16px;color:var(--ink-dim);font-size:16px;max-width:62ch}

/* ---------- index / eyebrow / breadcrumb ---------- */
.mono{font-family:var(--font-mono);font-size:11.5px;letter-spacing:.18em;color:var(--ink-dim)}
.index-tag{
  display:inline-flex;align-items:center;gap:9px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.18em;
  color:var(--cyan);text-transform:uppercase;
}
.index-tag::before{content:"";width:24px;height:1px;background:var(--cyan);display:block}
.crumbs{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;color:var(--ink-dim)}
.crumbs a{color:var(--ink-dim)}
.crumbs a:hover{color:var(--cyan)}
.crumbs li+li::before{content:"/";color:var(--line);margin-right:8px}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:42px;padding:0 20px;border:1px solid var(--line);border-radius:2px;
  font-size:14px;font-weight:600;letter-spacing:.02em;line-height:1;
  color:var(--ink);background:rgba(232,241,236,.03);
  transition:background .16s var(--ease),color .16s var(--ease),border-color .16s var(--ease),transform .16s var(--ease);
}
.btn:hover{border-color:var(--cyan);color:var(--cyan)}
.btn:active{transform:translateY(1px)}
.btn--signal{background:var(--orange);border-color:var(--orange);color:#16100C;font-weight:700}
.btn--signal:hover{background:#FF824F;border-color:#FF824F;color:#16100C}
.btn--ghost{background:rgba(232,241,236,.03);border-color:var(--line);color:var(--ink)}
.btn--ghost:hover{border-color:var(--cyan);color:var(--cyan)}
.btn--line{border-color:var(--cyan);color:var(--cyan);background:transparent}
.btn--line:hover{background:rgba(0,240,200,.1)}

/* ---------- tags ---------- */
.tag{
  display:inline-flex;align-items:center;gap:6px;height:24px;padding:0 10px;
  font-size:11.5px;letter-spacing:.08em;border-radius:2px;
  border:1px solid var(--line);color:var(--ink-dim);background:rgba(0,240,200,.04);
}
.tag--cyan{border-color:rgba(0,240,200,.5);color:var(--cyan);background:rgba(0,240,200,.1)}
.tag--violet{border-color:var(--violet);color:#EADDF3;background:rgba(110,74,134,.34)}
.tag--wine{border-color:var(--wine);color:#F4DCDF;background:rgba(126,43,51,.34)}
.tag--gold{border-color:rgba(201,162,39,.7);color:#F0DFA6;background:rgba(201,162,39,.16)}

/* ---------- panels & cards ---------- */
.panel{
  position:relative;background:var(--panel);border:1px solid var(--line);border-radius:2px;
  padding:clamp(16px,2.2vw,26px);
}
.panel--accent{border-left:2px solid var(--cyan)}
.panel--violet{border-left:2px solid var(--violet)}
.panel--wine{border-left:2px solid var(--wine)}
.card-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(238px,1fr));gap:14px}

/* ---------- data band ---------- */
.data-band{display:flex;flex-wrap:wrap;gap:1px;background:var(--line);border:1px solid var(--line);border-radius:2px}
.data-band__cell{flex:1 1 150px;background:var(--bg-deep);padding:14px 16px}
.data-band__cell:nth-child(even){background:#12312A}
.data-band__key{display:block;font-family:var(--font-mono);font-size:10px;letter-spacing:.2em;color:var(--ink-soft);margin-bottom:6px}
.data-band__val{display:block;font-size:22px;font-weight:800;letter-spacing:-.02em;line-height:1.15;color:var(--ink)}
.data-band__val--cyan{color:var(--cyan)}
.data-band__val--orange{color:var(--orange)}
.data-band__val--gold{color:var(--gold)}

/* ---------- track / steps ---------- */
.track{position:relative;display:grid;gap:18px;padding-left:28px}
.track::before{content:"";position:absolute;left:7px;top:8px;bottom:8px;width:1px;background:linear-gradient(180deg,var(--cyan),var(--line) 70%)}
.track__node{position:relative}
.track__node::before{content:"";position:absolute;left:-28px;top:9px;width:9px;height:9px;border:1px solid var(--cyan);background:var(--bg);transform:rotate(45deg)}
.track__node.is-done::before{background:var(--cyan)}

/* ---------- folds ---------- */
.fold{border:1px solid var(--line);background:var(--panel);border-radius:2px}
.fold+.fold{margin-top:10px}
.fold__head{display:flex;align-items:center;gap:12px;padding:14px 18px;cursor:pointer;font-weight:700;font-size:15px;list-style:none}
.fold__head::-webkit-details-marker{display:none}
.fold__head::after{content:"+";margin-left:auto;font-family:var(--font-mono);color:var(--cyan);font-size:16px;line-height:1}
.fold[open] .fold__head::after{content:"–"}
.fold__body{padding:0 18px 18px;color:var(--ink-dim);font-size:15px}
.fold__body p+p{margin-top:10px}

/* ---------- decorative flags ---------- */
.slant-flag{
  display:inline-block;padding:5px 16px;
  background:var(--violet);color:#F2E9F8;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.18em;
  clip-path:polygon(9px 0,100% 0,calc(100% - 9px) 100%,0 100%);
}
.slant-flag--wine{background:var(--wine);color:#F7E4E6}
.slant-flag--cyan{background:var(--cyan);color:#04241D}

/* ---------- media placeholders ---------- */
.media{
  position:relative;overflow:hidden;border:1px solid var(--line);border-radius:2px;
  background:linear-gradient(140deg,#12332B 0%,#0B1F1A 100%);
}
.media img{width:100%;height:100%;object-fit:cover;filter:saturate(.55) contrast(1.06) brightness(.95)}
.media::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:linear-gradient(rgba(0,240,200,.07) 1px,transparent 1px),linear-gradient(90deg,rgba(0,240,200,.07) 1px,transparent 1px);
  background-size:28px 28px;
}
.media--16x9{aspect-ratio:16/9}
.media--4x3{aspect-ratio:4/3}
.media--3x2{aspect-ratio:3/2}
.media--1x1{aspect-ratio:1/1}
.media__caption{
  position:absolute;left:0;right:0;bottom:0;z-index:2;
  padding:9px 12px;background:linear-gradient(0deg,rgba(11,31,26,.94),rgba(11,31,26,0));
  font-family:var(--font-mono);font-size:10.5px;letter-spacing:.14em;color:var(--ink-dim);
}
.media--empty{display:grid;place-items:center;min-height:180px}
.media--empty::before{content:"IMAGE · 战术线稿位";font-family:var(--font-mono);font-size:10.5px;letter-spacing:.2em;color:var(--ink-soft)}

/* ---------- header : rail + topbar ---------- */
.site-header{position:relative;z-index:100}

.rail{
  position:fixed;top:0;bottom:0;left:0;width:var(--rail-w);z-index:96;
  display:flex;flex-direction:column;align-items:center;
  background:linear-gradient(180deg,rgba(0,240,200,.07),rgba(0,240,200,0) 38%),var(--bg-deep);
  border-right:1px solid var(--line);
}
.rail::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:linear-gradient(rgba(42,74,66,.6) 1px,transparent 1px);
  background-size:100% 26px;opacity:.34;
}
.rail__brand{
  position:relative;z-index:1;width:100%;
  display:flex;flex-direction:column;align-items:center;gap:10px;
  padding:16px 0 14px;border-bottom:1px solid var(--line);
}
.rail__brand-mark{
  display:grid;place-items:center;width:34px;height:34px;
  border:1px solid var(--cyan);border-radius:2px;
  color:var(--cyan);font-size:16px;font-weight:800;letter-spacing:-.02em;
  box-shadow:inset 0 0 0 3px rgba(0,240,200,.07);
}
.rail__brand-text{writing-mode:vertical-rl;text-orientation:mixed;font-size:10.5px;letter-spacing:.24em;color:var(--ink-dim);line-height:1}

.rail__nav{position:relative;z-index:1;flex:1;min-height:0;width:100%;overflow-y:auto;overflow-x:hidden;padding:8px 0}
.rail__nav::-webkit-scrollbar{width:0}
.rail__list{display:flex;flex-direction:column}
.rail__link{
  display:flex;flex-direction:column;align-items:center;gap:7px;
  padding:11px 4px;color:var(--ink-dim);
  border-left:2px solid transparent;
  transition:color .18s var(--ease),background-color .18s var(--ease),border-color .18s var(--ease);
}
.rail__link:hover{color:var(--ink);background:rgba(0,240,200,.07)}
.rail__num{font-family:var(--font-mono);font-size:10px;letter-spacing:.12em;opacity:.65}
.rail__label{writing-mode:vertical-rl;text-orientation:mixed;font-size:12.5px;letter-spacing:.2em;line-height:1}
.rail__link[aria-current="page"]{
  color:var(--cyan);border-left-color:var(--cyan);background:rgba(0,240,200,.1);
}
.rail__link[aria-current="page"] .rail__num{opacity:1}
.rail__link[aria-current="page"] .rail__label{font-weight:700}

.rail__foot{
  position:relative;z-index:1;width:100%;
  display:flex;flex-direction:column;align-items:center;gap:8px;
  padding:12px 0 16px;border-top:1px solid var(--line);
}
.rail__status{width:7px;height:7px;background:var(--cyan);box-shadow:0 0 0 3px rgba(0,240,200,.16)}
.rail__foot-text{font-family:var(--font-mono);font-size:9.5px;letter-spacing:.2em;color:var(--ink-soft)}

.topbar{
  position:fixed;top:0;left:var(--rail-w);right:0;height:var(--bar-h);z-index:90;
  display:flex;align-items:center;gap:16px;
  padding:0 clamp(14px,2.4vw,28px);
  background:rgba(11,31,26,.9);
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
}
.topbar__tagline{display:flex;align-items:center;gap:9px;font-size:13px;letter-spacing:.04em;color:var(--ink);white-space:nowrap;max-width:none}
.topbar__dot{width:6px;height:6px;background:var(--orange);display:block}
.topbar__index{display:flex;align-items:baseline;gap:7px;font-family:var(--font-mono);font-size:10.5px;letter-spacing:.2em;color:var(--ink-soft);white-space:nowrap}
.topbar__index-val{font-size:12px;color:var(--cyan)}
.topbar__quick{margin-left:auto;display:flex;gap:10px}
.topbar .btn{height:36px;padding:0 16px;font-size:13px}
.topbar__progress{
  position:absolute;left:0;bottom:0;height:2px;width:100%;
  transform:scaleX(0);transform-origin:0 50%;
  background:linear-gradient(90deg,var(--cyan),var(--orange));
  pointer-events:none;
}

.nav-toggle{
  display:none;align-items:center;gap:8px;height:36px;padding:0 12px;
  border:1px solid var(--line);border-radius:2px;
  color:var(--ink);background:rgba(0,240,200,.06);font-size:13px;
}
.nav-toggle__bars{display:grid;gap:3px;width:16px}
.nav-toggle__bars i{display:block;height:1.5px;background:currentColor}
.nav-toggle:hover{border-color:var(--cyan);color:var(--cyan)}
.site-header[data-open] .nav-toggle__bars i:nth-child(2){opacity:0}

.nav-scrim{
  position:fixed;inset:0;z-index:94;
  background:rgba(4,14,12,.66);
  opacity:0;transition:opacity .2s var(--ease);
  pointer-events:none;
}
.site-header[data-open] .nav-scrim{opacity:1;pointer-events:auto}

/* ---------- footer ---------- */
.site-footer{
  position:relative;margin-top:clamp(48px,7vw,96px);
  background:var(--bg-deep);border-top:1px solid var(--line);
  padding-top:clamp(34px,4.6vw,62px);
  overflow:hidden;
}
.site-footer::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:linear-gradient(rgba(42,74,66,.55) 1px,transparent 1px),linear-gradient(90deg,rgba(42,74,66,.55) 1px,transparent 1px);
  background-size:46px 46px;opacity:.4;
  -webkit-mask-image:linear-gradient(180deg,#000 0%,rgba(0,0,0,.15) 78%,transparent 100%);
  mask-image:linear-gradient(180deg,#000 0%,rgba(0,0,0,.15) 78%,transparent 100%);
}
.site-footer::after{
  content:"";position:absolute;top:0;left:0;width:120px;height:2px;background:var(--cyan);
}
.footer-grid{position:relative;z-index:1;display:grid;grid-template-columns:1.5fr 1fr 1fr 1.25fr;gap:clamp(20px,3vw,44px)}
.footer-col{min-width:0}
.footer-col--brand{padding-right:8px}
.footer-brand{display:flex;align-items:center;gap:9px;font-size:19px;font-weight:800;letter-spacing:-.02em;color:var(--ink)}
.footer-brand::before{content:"";width:9px;height:9px;background:var(--cyan);display:block}
.footer-line{margin-top:10px;font-size:13.5px;letter-spacing:.02em;color:var(--ink-dim);max-width:26ch}
.footer-note{margin-top:6px;font-size:12.5px;color:var(--ink-soft)}
.footer-note--mono{font-family:var(--font-mono);font-size:11px;letter-spacing:.1em}
.footer-title{margin-bottom:14px;font-family:var(--font-mono);font-size:10.5px;font-weight:400;letter-spacing:.2em;color:var(--cyan);line-height:1.4}
.footer-list{display:grid;gap:9px;font-size:13.5px}
.footer-list a{color:var(--ink-dim);transition:color .16s var(--ease)}
.footer-list a:hover{color:var(--cyan)}
.footer-list--meta{gap:11px}
.footer-list--meta li{display:grid;gap:1px;min-width:0}
.footer-key{font-family:var(--font-mono);font-size:10px;letter-spacing:.18em;color:var(--ink-soft)}
.footer-val{font-size:12.5px;color:var(--ink-dim);word-break:break-word}
.footer-bottom{
  position:relative;z-index:1;
  margin-top:clamp(26px,4vw,46px);padding-block:16px 22px;
  border-top:1px solid var(--line);
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px 24px;
}
.footer-legal{display:flex;flex-wrap:wrap;gap:20px}
.footer-link{font-size:12.5px;letter-spacing:.04em;color:var(--ink-dim)}
.footer-link:hover{color:var(--cyan)}
.footer-icp{font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;color:var(--ink-soft);text-align:right;max-width:100%}

/* ---------- reveal ---------- */
[data-reveal]{transition:opacity .28s var(--ease),transform .28s var(--ease)}
.js-reveal [data-reveal]{opacity:0;transform:translateY(12px)}
.js-reveal [data-reveal].is-in{opacity:1;transform:none}

/* ---------- responsive : tablet ---------- */
@media (max-width:1100px){
  :root{--rail-w:76px}
  .rail__label{font-size:11.5px;letter-spacing:.16em}
  .rail__brand-text{font-size:10px}
  .footer-grid{grid-template-columns:1fr 1fr;gap:28px}
  .footer-col--brand{grid-column:1 / -1}
}

@media (max-width:900px){
  .span-3,.span-4,.span-5,.span-6,.span-7,.span-8{grid-column:span 12}
}

/* ---------- responsive : mobile drawer ---------- */
@media (max-width:899px){
  :root{--rail-w:0px;--bar-h:56px}
  body{padding-left:0}
  body.nav-open{overflow:hidden}

  .rail{
    width:min(80vw,304px);
    transform:translateX(-100%);
    transition:transform .26s var(--ease);
    z-index:96;
    box-shadow:1px 0 0 var(--line);
  }
  .site-header[data-open] .rail{transform:translateX(0)}
  .rail::before{opacity:.22}

  .rail__brand{flex-direction:row;justify-content:flex-start;gap:12px;padding:16px 18px}
  .rail__brand-mark{width:30px;height:30px;font-size:14px}
  .rail__brand-text{writing-mode:horizontal-tb;text-orientation:initial;font-size:12.5px;letter-spacing:.16em;color:var(--ink)}

  .rail__nav{padding:6px 0}
  .rail__link{flex-direction:row;align-items:center;justify-content:flex-start;gap:14px;padding:15px 18px;border-left-width:2px}
  .rail__label{writing-mode:horizontal-tb;text-orientation:initial;font-size:14.5px;letter-spacing:.06em}
  .rail__num{font-size:11px;min-width:20px}

  .rail__foot{flex-direction:row;justify-content:flex-start;gap:10px;padding:14px 18px}

  .topbar{left:0;gap:10px}
  .topbar__tagline{font-size:12.5px}
  .topbar__index{display:none}
  .topbar__quick{display:none}
  .nav-toggle{display:inline-flex;margin-left:auto}
}

@media (max-width:560px){
  body{font-size:16px}
  .footer-grid{grid-template-columns:1fr;gap:24px}
  .footer-bottom{flex-direction:column;align-items:flex-start}
  .footer-icp{text-align:left}
  .page-head__title{font-size:clamp(28px,8vw,44px)}
}

/* ---------- motion preferences ---------- */
@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-reveal [data-reveal]{opacity:1 !important;transform:none !important}
}