/* ============================================================
   B体育入口 · site.css  (reset / tokens / shell / components)
   ============================================================ */

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,h5,p,ul,ol,figure,blockquote,dl,dd{margin:0}
ul,ol{list-style:none;padding:0}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer}
img,svg,canvas{display:block;max-width:100%}
table{border-collapse:collapse}

:root{
  /* ---- brand palette ---- */
  --ink-deep:#0B1F1A;
  --pitch-green:#123A2E;
  --grid-mint:#1E4A3C;
  --fluoro:#35F0C0;
  --hover-cyan:#1FA98A;
  --signal:#FF7A3D;
  --amber:#FFC48A;
  --paper:#E8F5EF;
  --text:#F2FBF7;
  --text-soft:rgba(242,251,247,.87);
  --text-muted:#9DB8AE;
  --violet:#7C6BFF;
  --ink-on-light:#0B1F1A;

  /* ---- type ---- */
  --font-sans:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,"Courier New",monospace;

  /* ---- shape ---- */
  --r-pill:999px;
  --r-xl:28px;
  --r-lg:22px;
  --r-md:16px;
  --r-sm:10px;

  /* ---- layout ---- */
  --container:1240px;
  --gutter:clamp(18px,4vw,44px);
  --hair:1px solid var(--grid-mint);
  --shadow-float:0 20px 44px -26px rgba(0,0,0,.95);
}

/* ------------------------------------------------------------
   base / chinese typography
   ------------------------------------------------------------ */
body{
  min-height:100vh;
  font-family:var(--font-sans);
  font-size:17px;
  line-height:1.9;
  font-weight:400;
  letter-spacing:.01em;
  color:var(--text);
  background-color:var(--ink-deep);
  background-image:
    repeating-linear-gradient(0deg,rgba(30,74,60,.30) 0 1px,transparent 1px 24px),
    repeating-linear-gradient(90deg,rgba(30,74,60,.30) 0 1px,transparent 1px 24px);
  background-attachment:fixed;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
h1,h2,h3,h4{font-weight:900;letter-spacing:-.02em;line-height:1.28;color:var(--text)}
p{color:var(--text-soft)}
strong,b{font-weight:800;color:var(--text)}
::selection{background:var(--fluoro);color:#06231C}

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

.skip-link{
  position:fixed;top:12px;left:14px;z-index:300;
  display:inline-block;padding:10px 18px;border-radius:var(--r-pill);
  background:var(--fluoro);color:#06231C;font-weight:800;font-size:14px;
  transform:translateY(-180%);
  transition:transform .18s ease;
}
.skip-link:focus{transform:translateY(0)}

/* ------------------------------------------------------------
   layout utilities
   ------------------------------------------------------------ */
.container{
  width:min(var(--container),calc(100% - var(--gutter) * 2));
  margin-inline:auto;
}
.grid{display:grid;gap:clamp(16px,2.4vw,30px)}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--split{grid-template-columns:minmax(0,7fr) minmax(0,4fr);align-items:start}
.stack > * + *{margin-top:clamp(14px,2vw,22px)}
.hr-band{height:1px;background:var(--grid-mint);border:0;margin:clamp(32px,5vw,64px) 0}

.prose{max-width:36em;font-size:17px;line-height:1.9;color:var(--text-soft)}
.prose p + p{margin-top:1em}
.prose h2,.prose h3{margin-top:1.6em;margin-bottom:.5em}
.prose a{color:var(--fluoro);border-bottom:1px solid rgba(53,240,192,.45)}
.prose a:hover{border-bottom-color:var(--fluoro)}
.prose ul,.prose ol{padding-left:1.2em;list-style:disc}
.prose li + li{margin-top:.35em}
.prose small{font-size:12.5px;color:var(--text-muted);line-height:1.7}

.eyebrow{
  display:inline-block;
  font-family:var(--font-mono);
  font-size:11.5px;letter-spacing:.22em;text-transform:uppercase;
  color:var(--text-muted);line-height:1.6;
}
.section-head{
  display:flex;flex-wrap:wrap;align-items:baseline;gap:10px 20px;
  margin-bottom:clamp(16px,2.4vw,28px);
}
.section-title{font-size:clamp(21px,2.6vw,30px);font-weight:900;letter-spacing:-.02em}

/* ------------------------------------------------------------
   buttons
   ------------------------------------------------------------ */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 22px;border-radius:var(--r-pill);
  font-size:15px;font-weight:800;line-height:1;letter-spacing:.01em;
  border:1px solid transparent;
  transition:background-color .18s ease,color .18s ease,border-color .18s ease,transform .18s ease;
}
.btn--sm{padding:9px 16px;font-size:13.5px}
.btn--primary{background:var(--fluoro);color:#06231C;border-color:var(--fluoro)}
.btn--primary:hover{background:#7BFFDD;border-color:#7BFFDD}
.btn--primary:active{background:var(--hover-cyan);border-color:var(--hover-cyan);transform:translateY(1px)}
.btn--ghost{background:transparent;color:var(--text);border-color:var(--grid-mint)}
.btn--ghost:hover{border-color:var(--fluoro);color:var(--fluoro)}
.btn--signal{background:var(--signal);color:#20120B;border-color:var(--signal)}
.btn--signal:hover{background:var(--amber);border-color:var(--amber)}

/* ------------------------------------------------------------
   chips / badges / cards / stats
   ------------------------------------------------------------ */
.chip{
  display:inline-flex;align-items:center;gap:8px;
  padding:7px 14px;border-radius:var(--r-pill);
  border:1px solid var(--grid-mint);
  background:rgba(18,58,46,.55);
  font-size:13px;color:var(--text-soft);line-height:1.5;
}
.badge{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 11px;border-radius:var(--r-pill);
  border:1px solid var(--grid-mint);
  background:rgba(11,31,26,.55);
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.06em;
  color:var(--text-muted);line-height:1.7;
}
.badge--fluoro{color:var(--fluoro);border-color:rgba(53,240,192,.45)}
.badge--violet{color:var(--violet);border-color:rgba(124,107,255,.5)}
.badge--live{background:var(--signal);border-color:var(--signal);color:#2A1206;font-weight:700}

.card{
  background:rgba(18,58,46,.55);
  border:var(--hair);
  border-radius:var(--r-xl);
  padding:clamp(18px,2.4vw,28px);
}
.card--paper{background:var(--paper);border-color:transparent;color:var(--ink-on-light)}
.card--paper p,.card--paper .prose{color:rgba(11,31,26,.82)}
.card--paper .eyebrow{color:rgba(11,31,26,.55)}

.stat{display:flex;flex-direction:column;gap:2px}
.stat__num{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  font-size:clamp(26px,3.4vw,40px);
  font-weight:800;line-height:1.1;letter-spacing:-.02em;
  color:var(--fluoro);
}
.stat__label{font-size:12px;line-height:1.7;color:var(--text-muted);letter-spacing:.08em}

/* ------------------------------------------------------------
   breadcrumb
   ------------------------------------------------------------ */
.crumb{margin:0 0 24px;font-size:12.5px;color:var(--text-muted)}
.crumb__list{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.crumb__item{display:inline-flex;align-items:center;gap:8px}
.crumb__item + .crumb__item::before{content:"/";color:var(--grid-mint)}
.crumb__link{color:var(--text-muted);transition:color .18s ease}
.crumb__link:hover{color:var(--fluoro)}
.crumb__current{color:var(--text-soft)}

/* ------------------------------------------------------------
   media frame (image placeholder container)
   ------------------------------------------------------------ */
.media-frame{
  position:relative;isolation:isolate;overflow:hidden;
  border-radius:var(--r-xl);
  border:var(--hair);
  background-color:var(--pitch-green);
  background-image:
    repeating-linear-gradient(0deg,rgba(30,74,60,.60) 0 1px,transparent 1px 24px),
    repeating-linear-gradient(90deg,rgba(30,74,60,.60) 0 1px,transparent 1px 24px);
  aspect-ratio:var(--ratio,16 / 9);
}
.media-frame > img,
.media-frame > canvas,
.media-frame > svg{width:100%;height:100%;object-fit:cover}
.media-frame__label{
  position:absolute;left:14px;top:14px;z-index:2;
  padding:5px 11px;border-radius:var(--r-pill);
  background:rgba(11,31,26,.82);
  border:1px solid rgba(53,240,192,.35);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;color:var(--fluoro);
  line-height:1.6;
}
.media-frame__caption{
  position:absolute;left:0;right:0;bottom:0;z-index:2;
  padding:16px 16px 13px;
  font-size:12px;line-height:1.7;color:var(--text-muted);
  background:linear-gradient(180deg,rgba(11,31,26,0),rgba(11,31,26,.92));
}

/* ------------------------------------------------------------
   toast (shared feedback layer)
   ------------------------------------------------------------ */
.toast{
  position:fixed;left:50%;bottom:26px;z-index:220;
  max-width:min(90vw,440px);
  padding:11px 20px;border-radius:var(--r-pill);
  background:var(--paper);color:var(--ink-on-light);
  font-size:13.5px;font-weight:800;line-height:1.6;text-align:center;
  opacity:0;pointer-events:none;
  transform:translate(-50%,18px);
  transition:opacity .2s ease,transform .2s ease;
  box-shadow:0 18px 40px -22px rgba(0,0,0,.95);
}
.toast.is-visible{opacity:1;transform:translate(-50%,0)}

/* ------------------------------------------------------------
   header : floating capsule
   ------------------------------------------------------------ */
.site-header{
  position:sticky;top:0;z-index:90;
  padding:20px var(--gutter) 0;
  pointer-events:none;
}
.nav-capsule{
  position:relative;pointer-events:auto;
  display:flex;align-items:center;gap:12px;
  width:min(var(--container),100%);
  margin-inline:auto;
  padding:10px 14px 12px 16px;
  border:var(--hair);
  border-radius:var(--r-pill);
  background:rgba(11,31,26,.80);
  box-shadow:var(--shadow-float);
  -webkit-backdrop-filter:blur(16px) saturate(150%);
  backdrop-filter:blur(16px) saturate(150%);
  transition:padding .22s ease,background-color .22s ease,border-radius .22s ease;
}
.nav-capsule.is-condensed{
  padding-top:6px;padding-bottom:8px;
  background:rgba(11,31,26,.94);
}

.brand{display:flex;align-items:center;gap:11px;min-width:0;flex:0 1 auto}
.brand-mark{
  position:relative;
  display:grid;place-items:center;
  width:38px;height:38px;flex:0 0 38px;
  border-radius:12px;
  background:linear-gradient(145deg,var(--fluoro),var(--hover-cyan));
  color:#06231C;
  font-family:var(--font-mono);font-weight:800;font-size:19px;letter-spacing:-.04em;
  box-shadow:0 0 0 1px rgba(53,240,192,.32),0 8px 20px -12px rgba(53,240,192,.75);
}
.site-header .brand-mark::after{
  content:"";position:absolute;top:-2px;right:-2px;
  width:9px;height:9px;border-radius:50%;
  background:var(--signal);
  box-shadow:0 0 0 3px rgba(11,31,26,.95);
}
.brand-mark--lg{width:46px;height:46px;flex-basis:46px;font-size:23px;border-radius:14px}
.brand-text{display:flex;flex-direction:column;line-height:1.15;min-width:0}
.brand-name{
  font-size:16.5px;font-weight:900;letter-spacing:-.015em;
  color:var(--text);white-space:nowrap;
}
.brand-tagline{
  margin-top:3px;
  font-family:var(--font-mono);
  font-size:10.5px;letter-spacing:.14em;
  color:var(--text-muted);white-space:nowrap;
}

.nav-chapter{
  display:none;
  align-items:center;gap:7px;
  padding:5px 13px;border-radius:var(--r-pill);
  border:1px solid rgba(53,240,192,.28);
  background:rgba(53,240,192,.08);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;
  color:var(--fluoro);white-space:nowrap;
  line-height:1.6;
}
.nav-chapter::before{
  content:"";width:6px;height:6px;border-radius:50%;
  background:var(--fluoro);flex:0 0 6px;
}

.nav-panel{
  display:flex;align-items:center;gap:14px;
  margin-left:auto;min-width:0;
}
.nav-list{display:flex;align-items:center;gap:2px}
.nav-link{
  display:inline-flex;align-items:center;
  padding:8px 12px;border-radius:var(--r-pill);
  font-size:13.5px;font-weight:600;line-height:1.5;
  color:var(--text-soft);white-space:nowrap;
  transition:color .18s ease,background-color .18s ease;
}
.nav-link:hover{color:var(--fluoro);background:rgba(53,240,192,.10)}
.nav-link[aria-current="page"]{
  background:var(--fluoro);color:#06231C;font-weight:800;
}
.nav-link[aria-current="page"]:hover{background:#7BFFDD;color:#06231C}

.nav-actions{display:flex;align-items:center;gap:8px}

.nav-toggle{
  display:none;align-items:center;gap:8px;
  margin-left:auto;
  padding:8px 13px;border-radius:var(--r-pill);
  border:1px solid var(--grid-mint);
  color:var(--text);font-size:12.5px;font-weight:700;line-height:1.5;
  transition:border-color .18s ease,color .18s ease;
}
.nav-toggle:hover{border-color:var(--fluoro);color:var(--fluoro)}
.nav-toggle__bars{position:relative;display:block;width:16px;height:12px;flex:0 0 16px}
.nav-toggle__bars span{
  position:absolute;left:0;right:0;height:2px;border-radius:2px;
  background:currentColor;
  transition:transform .2s ease;
}
.nav-toggle__bars span:nth-child(1){top:0}
.nav-toggle__bars span:nth-child(2){bottom:0}
.nav-toggle[data-open] .nav-toggle__bars span:nth-child(1){transform:translateY(5px) rotate(45deg)}
.nav-toggle[data-open] .nav-toggle__bars span:nth-child(2){transform:translateY(-5px) rotate(-45deg)}

.nav-progress{
  position:absolute;left:24px;right:24px;bottom:5px;
  height:2px;border-radius:2px;
  background:rgba(53,240,192,.14);
  overflow:hidden;pointer-events:none;
}
.nav-progress__bar{
  display:block;width:100%;height:100%;
  border-radius:2px;
  background:linear-gradient(90deg,var(--hover-cyan),var(--fluoro));
  transform:scaleX(0);transform-origin:left center;
  transition:transform .12s linear;
}

/* ------------------------------------------------------------
   footer : tactical pitch
   ------------------------------------------------------------ */
.site-footer{
  position:relative;overflow:hidden;
  margin-top:clamp(56px,9vw,120px);
  padding:clamp(46px,7vw,82px) 0 38px;
  border-top:1px solid var(--grid-mint);
  background-image:
    repeating-linear-gradient(90deg,rgba(30,74,60,.30) 0 1px,transparent 1px 48px),
    linear-gradient(180deg,rgba(11,31,26,0) 0%,rgba(18,58,46,.72) 42%,rgba(18,58,46,.92) 100%);
}
.site-footer::before{
  content:"";position:absolute;left:50%;top:-150px;
  width:300px;height:300px;margin-left:-150px;
  border:1px solid rgba(30,74,60,.95);border-radius:50%;
  pointer-events:none;
}
.footer-inner{
  position:relative;z-index:1;
  width:min(var(--container),calc(100% - var(--gutter) * 2));
  margin-inline:auto;
}
.footer-top{
  display:grid;
  grid-template-columns:minmax(220px,4fr) 8fr;
  gap:clamp(24px,4vw,56px);
  align-items:start;
}
.footer-brand{display:flex;flex-direction:column;gap:14px}
.footer-brand__line{font-size:15px;font-weight:800;line-height:1.6;color:var(--text)}
.footer-brand__note{font-size:12.5px;line-height:1.8;color:var(--text-muted);max-width:26em}

.footer-nav{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:clamp(16px,3vw,32px)}
.footer-col__title{
  margin-bottom:14px;
  font-family:var(--font-mono);
  font-size:11px;font-weight:700;letter-spacing:.18em;text-transform:uppercase;
  color:var(--text-muted);line-height:1.6;
}
.footer-list{display:flex;flex-direction:column;gap:2px}
.footer-link{
  display:inline-block;padding:5px 0;
  font-size:14.5px;line-height:1.7;color:var(--text-soft);
  border-bottom:1px solid transparent;
  transition:color .18s ease,border-color .18s ease;
}
.footer-link:hover{color:var(--fluoro);border-bottom-color:rgba(53,240,192,.55)}

.footer-contact{
  margin-top:clamp(30px,5vw,54px);
  display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px;
  padding:18px clamp(16px,2.2vw,24px) 16px;
  border-radius:var(--r-xl);
  border:var(--hair);
  background:rgba(11,31,26,.62);
}
.contact-item{
  display:flex;flex-wrap:wrap;align-items:center;gap:6px 10px;
  min-width:0;
}
.contact-item__key{
  flex:0 0 100%;
  font-family:var(--font-mono);
  font-size:11px;letter-spacing:.14em;text-transform:uppercase;
  color:var(--text-muted);line-height:1.6;
}
.contact-item__val{
  font-size:14.5px;line-height:1.7;color:var(--text);
  word-break:break-all;
}
.copy-chip{
  padding:4px 11px;border-radius:var(--r-pill);
  border:1px solid var(--grid-mint);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;
  color:var(--text-muted);line-height:1.7;
  transition:color .18s ease,border-color .18s ease,background-color .18s ease;
}
.copy-chip:hover{color:var(--fluoro);border-color:rgba(53,240,192,.6);background:rgba(53,240,192,.08)}
.copy-chip--mini{padding:2px 9px;font-size:10.5px}
.footer-contact__note{
  grid-column:1 / -1;
  margin-top:4px;padding-top:12px;
  border-top:1px dashed rgba(30,74,60,.9);
  font-size:12px;line-height:1.8;color:var(--text-muted);
}

.footer-base{
  margin-top:26px;padding-top:18px;
  border-top:1px dashed rgba(30,74,60,.9);
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:8px 26px;
}
.footer-base__legal{font-size:12.5px;line-height:1.9;color:var(--text-muted)}
.footer-icp{font-family:var(--font-mono);color:var(--text-soft);letter-spacing:.02em}
.footer-base__service{font-size:12px;line-height:1.8;color:var(--text-muted)}

/* ------------------------------------------------------------
   reveal protocol
   ------------------------------------------------------------ */
[data-reveal]{opacity:0;transform:translateY(8px);transition:opacity .18s ease,transform .18s ease}
[data-reveal].is-visible{opacity:1;transform:none}

/* ------------------------------------------------------------
   responsive : tablet
   ------------------------------------------------------------ */
@media (max-width:1340px){
  .nav-cta-secondary{display:none}
}
@media (max-width:1280px){
  .brand-tagline{display:none}
  .brand-name{font-size:15.5px}
}
@media (max-width:1240px) and (min-width:1121px){
  .nav-link{font-size:12.5px;padding:7px 9px}
  .nav-panel{gap:10px}
}

/* ------------------------------------------------------------
   responsive : collapse navigation
   ------------------------------------------------------------ */
@media (max-width:1120px){
  .site-header{padding:14px var(--gutter) 0}
  .nav-capsule{padding:8px 10px 10px 12px;gap:8px}
  .nav-toggle{display:inline-flex}
  .nav-chapter{display:none !important}
  .nav-panel{
    position:absolute;
    top:calc(100% + 10px);
    left:0;right:0;
    display:none;
    flex-direction:column;
    align-items:stretch;
    gap:10px;
    margin-left:0;
    padding:14px;
    border:var(--hair);
    border-radius:var(--r-xl);
    background:rgba(11,31,26,.97);
    box-shadow:var(--shadow-float);
    -webkit-backdrop-filter:blur(18px);
    backdrop-filter:blur(18px);
    max-height:calc(100vh - 150px);
    overflow-y:auto;
  }
  .nav-panel[data-open]{display:flex}
  .nav-list{flex-direction:column;align-items:stretch;gap:2px}
  .nav-link{display:block;padding:12px 14px;border-radius:14px;font-size:15px}
  .nav-actions{flex-direction:column;align-items:stretch;gap:8px;margin-top:4px;padding-top:12px;border-top:1px dashed var(--grid-mint)}
  .nav-actions .btn{width:100%}
  .nav-panel[data-open] .nav-cta-secondary{display:inline-flex}
  .nav-progress{left:18px;right:18px;bottom:4px}
}

/* ------------------------------------------------------------
   responsive : footer & blocks
   ------------------------------------------------------------ */
@media (max-width:900px){
  .footer-top{grid-template-columns:1fr;gap:32px}
  .footer-contact{grid-template-columns:1fr}
  .grid--split{grid-template-columns:1fr}
  .grid--3{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:640px){
  body{font-size:16px;line-height:1.85}
  .grid--2,.grid--3{grid-template-columns:1fr}
  .footer-nav{grid-template-columns:1fr;gap:22px}
  .footer-base{flex-direction:column;align-items:flex-start}
  .media-frame{aspect-ratio:4 / 3}
  .brand-mark--lg{width:40px;height:40px;flex-basis:40px;font-size:20px}
  .nav-toggle__text{display:none}
  .toast{bottom:18px}
}

/* ------------------------------------------------------------
   reduced motion
   ------------------------------------------------------------ */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  [data-reveal]{opacity:1;transform:none}
}