/* ===== B体育看台 · /assets/site.css ===== */

/* ---------- 1. Reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:120px}
body,h1,h2,h3,h4,p,figure,blockquote,dl,dd,ul,ol{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,video{max-width:100%}
button{font:inherit;color:inherit;background:none;border:0}
address{font-style:normal}
table{border-collapse:collapse}

/* ---------- 2. Tokens ---------- */
:root{
  --ink:#081326;
  --stand:#10203A;
  --turf:#39C46E;
  --cyan:#63F5D6;
  --track:#FF7A3D;
  --snow:#E8F1F8;
  --rock:#2B3648;
  --moss:#6E8F72;
  --clay:#B4715A;
  --paper:#F1ECE1;
  --note:#9BB0C6;

  --fs-12:12px;--fs-13:13px;--fs-15:15px;--fs-17:17px;
  --fs-22:22px;--fs-30:30px;--fs-44:44px;--fs-64:64px;--fs-96:96px;

  --sans:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif;
  --mono:ui-monospace,"JetBrains Mono","Roboto Mono",SFMono-Regular,Menlo,Consolas,monospace;

  --w-max:1360px;
  --w-narrow:720px;
  --gutter:clamp(16px,4vw,48px);
  --radius:2px;
  --shadow-ground:0 1px 0 rgba(0,0,0,.4);
  --ease:160ms ease-out;
  --ease-open:220ms ease-out;
}

/* ---------- 3. Base typography ---------- */
body{
  font-family:var(--sans);
  font-size:var(--fs-17);
  line-height:1.85;
  color:var(--snow);
  background:var(--ink);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
h1,h2,h3,h4{font-weight:800;line-height:1.12;letter-spacing:-.02em;color:var(--snow)}
h1{font-size:clamp(44px,7vw,96px);line-height:.98;letter-spacing:-.04em}
h2{font-size:clamp(30px,4vw,44px);line-height:1.05;letter-spacing:-.03em}
h3{font-size:var(--fs-22);line-height:1.25}
p{max-width:62ch}
b,strong{font-weight:700}
small{font-size:var(--fs-13);color:var(--note)}
a{color:var(--turf);text-decoration:none}
a:hover{color:var(--turf)}
::selection{background:var(--turf);color:var(--ink)}
:focus-visible{outline:2px solid var(--cyan);outline-offset:2px}
.mono{font-family:var(--mono);font-variant-numeric:tabular-nums;letter-spacing:.02em}

/* ---------- 4. Layout ---------- */
.container{width:100%;max-width:var(--w-max);margin-inline:auto;padding-inline:var(--gutter)}
.container--narrow{max-width:var(--w-narrow)}
.section{padding:clamp(44px,7vw,96px) 0;border-top:1px solid var(--rock)}
.section:first-of-type{border-top:0}
.section-title{font-size:clamp(30px,4.2vw,44px);line-height:1.05;letter-spacing:-.03em;font-weight:800}
.section-note{font-family:var(--mono);font-size:var(--fs-12);letter-spacing:.12em;color:var(--clay);max-width:none}

.grid{display:grid;gap:24px;grid-template-columns:repeat(12,minmax(0,1fr))}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}

.ladder{display:grid;gap:24px}
.ladder > *:nth-child(1){margin-left:0}
.ladder > *:nth-child(2){margin-left:8px}
.ladder > *:nth-child(3){margin-left:16px}
.ladder > *:nth-child(4){margin-left:24px}
.ladder > *:nth-child(n+5){margin-left:24px}

.glow{position:relative;isolation:isolate}
.glow::before{
  content:"";position:absolute;z-index:-1;left:8%;top:-40px;
  width:min(60%,760px);height:360px;pointer-events:none;
  background:radial-gradient(ellipse at center,rgba(57,196,110,.18),rgba(99,245,214,.06) 55%,transparent 72%);
}

/* ---------- 5. Skip link ---------- */
.skip-link{
  position:absolute;left:8px;top:-64px;z-index:200;
  padding:10px 18px;
  background:var(--paper);color:var(--ink);
  font-size:var(--fs-13);font-weight:700;
  border-radius:var(--radius);
  transition:top var(--ease);
}
.skip-link:focus{top:8px;color:var(--ink)}

/* ---------- 6. Buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:11px 20px;min-height:44px;
  font-family:var(--sans);font-size:var(--fs-15);font-weight:700;letter-spacing:.02em;
  color:var(--snow);background:var(--stand);
  border:1px solid var(--rock);border-radius:var(--radius);
  cursor:pointer;text-decoration:none;white-space:nowrap;
  transition:border-color var(--ease),background var(--ease),color var(--ease);
}
.btn:hover{border-color:var(--turf);color:var(--snow)}
.btn--cta{background:var(--track);border-color:var(--track);color:var(--ink)}
.btn--cta:hover{background:#ff8f5c;border-color:#ff8f5c;color:var(--ink)}
.btn--ghost{background:transparent;border-color:var(--rock);color:var(--snow)}
.btn--ghost:hover{background:rgba(57,196,110,.08)}
.btn--paper{background:var(--paper);border-color:var(--paper);color:var(--ink)}
.btn--paper:hover{background:#fff;border-color:#fff;color:var(--ink)}

/* ---------- 7. Header ---------- */
.site-header{
  position:sticky;top:0;z-index:80;
  background:linear-gradient(180deg,rgba(8,19,38,.98),rgba(8,19,38,.93));
  border-bottom:1px solid var(--rock);
  backdrop-filter:blur(10px);
  -webkit-backdrop-filter:blur(10px);
}
.scroll-progress{
  position:absolute;left:0;top:0;right:0;height:2px;
  transform:scaleX(0);transform-origin:0 50%;
  background:linear-gradient(90deg,var(--turf),var(--cyan) 60%,var(--track));
  pointer-events:none;
}
.header-tier{background:rgba(16,32,58,.55);border-bottom:1px solid rgba(43,54,72,.9)}
.header-tier-inner{
  display:flex;align-items:center;gap:14px;flex-wrap:nowrap;overflow-x:auto;
  max-width:var(--w-max);margin-inline:auto;
  padding:6px var(--gutter);
  font-family:var(--mono);font-size:var(--fs-12);letter-spacing:.08em;
  scrollbar-width:none;
}
.header-tier-inner::-webkit-scrollbar{display:none}
.tier-badge{
  flex:0 0 auto;padding:1px 8px;
  color:var(--clay);border:1px solid rgba(180,113,90,.6);border-radius:var(--radius);
  background:rgba(180,113,90,.1);
}
.tier-link{
  flex:0 0 auto;color:var(--moss);text-decoration:none;
  padding-bottom:1px;border-bottom:1px solid transparent;
  transition:border-color var(--ease),color var(--ease);
}
.tier-link:hover,.tier-link:focus-visible{color:var(--snow);border-bottom-color:var(--turf)}
.tier-seam{flex:0 0 auto;width:1px;height:12px;background:var(--rock)}
.tier-note{
  margin-left:auto;flex:0 0 auto;max-width:none;
  color:var(--note);font-family:var(--mono);font-size:var(--fs-12);letter-spacing:.06em;
}
.tier-stamp{color:var(--cyan);margin-left:8px}

.header-inner{
  display:flex;align-items:center;gap:18px;
  max-width:var(--w-max);margin-inline:auto;
  padding:0 var(--gutter);min-height:76px;
}

.brand{
  display:inline-flex;align-items:center;gap:12px;flex:0 0 auto;
  padding:12px 0;color:var(--snow);text-decoration:none;
}
.brand:hover{color:var(--snow)}
.brand-mark{
  display:inline-flex;align-items:center;justify-content:center;flex:0 0 auto;
  width:36px;height:36px;
  font-family:var(--mono);font-size:17px;font-weight:700;
  color:var(--turf);
  border:1px solid var(--turf);border-radius:var(--radius);
  background:linear-gradient(150deg,rgba(57,196,110,.2),rgba(8,19,38,0));
  transition:background var(--ease),border-color var(--ease),color var(--ease);
}
.brand:hover .brand-mark{border-color:var(--cyan);color:var(--cyan);background:rgba(57,196,110,.28)}
.brand-mark--lg{width:46px;height:46px;font-size:21px}
.brand-text{display:flex;flex-direction:column;line-height:1.05}
.brand-name{font-size:19px;font-weight:800;letter-spacing:.02em;color:var(--snow)}
.brand-tag{font-family:var(--mono);font-size:11px;letter-spacing:.14em;color:var(--moss);margin-top:5px}

.site-nav{display:flex;align-items:center;flex:1 1 auto;min-width:0}
.nav-list{display:flex;align-items:center;gap:2px;flex-wrap:nowrap}
.nav-list--alt{margin-left:auto}
.nav-seam{flex:0 0 auto;width:1px;height:24px;background:var(--rock);margin:0 12px;align-self:center}
.nav-list a{
  display:inline-flex;align-items:center;
  padding:10px 12px;min-height:44px;
  font-size:var(--fs-15);font-weight:600;letter-spacing:.01em;
  color:var(--snow);text-decoration:none;
  border:1px solid transparent;border-radius:var(--radius);
  transition:border-color var(--ease),background var(--ease),color var(--ease);
}
.nav-list a:hover,.nav-list a:focus-visible{color:var(--snow);border-color:var(--turf);background:rgba(57,196,110,.07)}
.nav-list a[aria-current="page"]{color:var(--turf);border-color:var(--rock);background:rgba(57,196,110,.12)}
.nav-list a[aria-current="page"]:hover{border-color:var(--turf)}

.header-actions{display:flex;align-items:center;gap:10px;flex:0 0 auto}
.header-cta{min-height:40px;padding:9px 16px;font-size:var(--fs-13)}

.nav-toggle{
  display:none;align-items:center;gap:8px;
  padding:10px 12px;min-height:44px;
  font-size:var(--fs-13);font-weight:700;letter-spacing:.06em;
  color:var(--snow);background:var(--stand);
  border:1px solid var(--rock);border-radius:var(--radius);
  cursor:pointer;
  transition:border-color var(--ease),color var(--ease),background var(--ease);
}
.nav-toggle:hover{border-color:var(--turf)}
.nav-toggle[aria-expanded="true"]{border-color:var(--turf);color:var(--turf)}
.nav-toggle-bars{position:relative;display:block;width:16px;height:10px;flex:0 0 auto}
.nav-toggle-bars::before,.nav-toggle-bars::after{
  content:"";position:absolute;left:0;right:0;height:1.5px;
  background:currentColor;
  transition:top var(--ease-open),transform var(--ease-open);
}
.nav-toggle-bars::before{top:0}
.nav-toggle-bars::after{top:8px}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::before{top:4px;transform:rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after{top:4px;transform:rotate(-45deg)}
.nav-toggle-label{line-height:1}

/* ---------- 8. Footer ---------- */
.site-footer{
  margin-top:clamp(48px,7vw,96px);
  background:linear-gradient(180deg,var(--ink) 0%,var(--stand) 46%,#0B1A30 100%);
  border-top:1px solid var(--rock);
  color:var(--snow);
}
.footer-inner{max-width:var(--w-max);margin-inline:auto;padding:clamp(36px,5vw,56px) var(--gutter) 0}
.footer-top{
  display:grid;grid-template-columns:minmax(190px,1fr) minmax(0,2.4fr);
  gap:32px 48px;padding-bottom:36px;border-bottom:1px solid var(--rock);
}
.footer-brand{padding-top:0}
.footer-brand-name{margin-top:14px;font-size:var(--fs-22);font-weight:800;letter-spacing:.02em;max-width:none}
.footer-brand-line{font-size:var(--fs-13);color:var(--note);letter-spacing:.04em;max-width:26ch}
.footer-brand-meta{margin-top:12px;font-size:var(--fs-12);letter-spacing:.1em;color:var(--clay);max-width:none}

.footer-nav{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px 32px}
.footer-group{--step:0px;padding-top:var(--step)}
.footer-group:nth-child(1){--step:0px}
.footer-group:nth-child(2){--step:8px}
.footer-group:nth-child(3){--step:16px}
.footer-group-title{
  font-family:var(--mono);font-size:var(--fs-13);font-weight:700;letter-spacing:.14em;
  color:var(--clay);text-transform:none;
  padding-bottom:10px;margin-bottom:10px;
  border-bottom:1px solid var(--rock);
}
.footer-group ul{display:grid;gap:1px}
.footer-group a{
  display:inline-flex;align-items:center;min-height:34px;
  font-size:var(--fs-15);color:var(--snow);text-decoration:none;
  border-bottom:1px solid transparent;
  transition:border-color var(--ease),color var(--ease);
}
.footer-group a:hover,.footer-group a:focus-visible{border-bottom-color:var(--turf);color:var(--snow)}

.footer-contact{
  display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));
  gap:18px 32px;padding:26px 0 30px;border-bottom:1px solid var(--rock);
}
.contact-item{display:flex;flex-direction:column;gap:4px;min-width:0}
.contact-label{
  font-family:var(--mono);font-size:var(--fs-12);letter-spacing:.14em;
  color:var(--clay);max-width:none;
}
.copy-btn{
  align-self:flex-start;max-width:100%;
  font-size:var(--fs-15);color:var(--cyan);
  padding:2px 0;cursor:pointer;text-align:left;
  border-bottom:1px dashed var(--rock);
  transition:color var(--ease),border-color var(--ease);
  word-break:break-all;
}
.copy-btn:hover,.copy-btn:focus-visible{border-bottom-color:var(--turf);color:var(--cyan)}
.copy-btn[data-copied="true"]{color:var(--turf);border-bottom-color:var(--turf)}
.contact-item--wide{grid-column:span 1}
.contact-address{font-size:var(--fs-15);line-height:1.7;color:var(--snow);max-width:34ch}
.contact-note{
  grid-column:1 / -1;max-width:62ch;
  font-size:var(--fs-13);line-height:1.75;color:var(--note);
}

.footer-bottom{
  display:flex;flex-wrap:wrap;align-items:center;gap:10px 24px;
  padding:18px 0 26px;
  font-family:var(--mono);font-size:var(--fs-12);letter-spacing:.06em;color:var(--note);
}
.footer-icp{color:var(--note)}
.footer-copy{color:var(--moss)}
.footer-legal{display:flex;flex-wrap:wrap;gap:8px 18px;margin-left:auto}
.footer-legal a{
  color:var(--note);text-decoration:none;
  border-bottom:1px solid transparent;
  transition:border-color var(--ease),color var(--ease);
}
.footer-legal a:hover,.footer-legal a:focus-visible{color:var(--snow);border-bottom-color:var(--turf)}

/* ---------- 9. Breadcrumb ---------- */
.breadcrumb{
  display:flex;flex-wrap:wrap;align-items:center;gap:6px 10px;
  padding:16px 0;border-bottom:1px solid var(--rock);
  font-family:var(--mono);font-size:var(--fs-12);letter-spacing:.08em;color:var(--note);
}
.breadcrumb a{
  color:var(--note);text-decoration:none;
  border-bottom:1px solid transparent;
  transition:border-color var(--ease);
}
.breadcrumb a:hover,.breadcrumb a:focus-visible{border-bottom-color:var(--turf)}
.breadcrumb__sep{color:var(--rock)}
.breadcrumb [aria-current="page"]{color:var(--snow)}

/* ---------- 10. Archive components ---------- */
.panel{
  display:flex;flex-direction:column;min-width:0;
  background:var(--stand);
  border:1px solid var(--rock);border-radius:var(--radius);
  box-shadow:var(--shadow-ground);
  transition:border-color var(--ease),background var(--ease);
}
.panel:hover{border-color:var(--turf)}
.panel__head{
  display:flex;align-items:center;justify-content:space-between;gap:12px;
  padding:10px 16px;border-bottom:1px solid var(--rock);
  font-family:var(--mono);font-size:var(--fs-12);letter-spacing:.12em;color:var(--clay);
}
.panel__body{padding:16px;display:flex;flex-direction:column;gap:10px}
.panel__title{font-size:var(--fs-22);font-weight:800;line-height:1.25;letter-spacing:-.01em}

.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:2px 8px;border:1px solid var(--rock);border-radius:var(--radius);
  font-family:var(--mono);font-size:var(--fs-13);font-weight:700;letter-spacing:.06em;
  color:var(--snow);background:rgba(16,32,58,.7);
}
.tag--league{color:var(--moss);border-color:rgba(110,143,114,.65);background:rgba(110,143,114,.12)}
.tag--venue{color:var(--clay);border-color:rgba(180,113,90,.65);background:rgba(180,113,90,.12)}
.tag--version{color:var(--turf);border-color:rgba(57,196,110,.6);background:rgba(57,196,110,.12)}
.tag--data{color:var(--cyan);border-color:rgba(99,245,214,.55);background:rgba(99,245,214,.1)}

.stat{display:flex;flex-direction:column;gap:2px;min-width:0}
.stat__value{
  font-family:var(--mono);font-size:clamp(30px,4vw,44px);line-height:1;
  letter-spacing:-.02em;color:var(--cyan);font-variant-numeric:tabular-nums;
  font-size:calc(clamp(30px,4vw,44px) * .98);
}
.stat__label{font-family:var(--mono);font-size:var(--fs-12);letter-spacing:.12em;color:var(--note)}

.eyebrow{
  display:inline-block;
  font-family:var(--mono);font-size:var(--fs-12);letter-spacing:.2em;
  color:var(--clay);line-height:1.4;
}
.eyebrow--vertical{writing-mode:vertical-rl;transform:rotate(180deg);letter-spacing:.3em}

/* ---------- 11. Image containers ---------- */
.media-frame{
  position:relative;overflow:hidden;isolation:isolate;
  border:1px solid var(--rock);border-radius:var(--radius);
  background:linear-gradient(150deg,var(--stand),var(--ink));
  aspect-ratio:16 / 9;
}
.media-frame > img{
  display:block;width:100%;height:100%;object-fit:cover;
  filter:brightness(.72) saturate(1.06);
}
.media-frame::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:rgba(8,19,38,.08);
}
.media-frame--wide{aspect-ratio:21 / 9}
.media-frame--square{aspect-ratio:1 / 1}
.media-frame--tall{aspect-ratio:4 / 5}
.media-frame__caption{
  position:absolute;left:0;right:0;bottom:0;z-index:2;
  padding:10px 14px;
  font-family:var(--mono);font-size:var(--fs-12);letter-spacing:.08em;color:var(--snow);
  background:linear-gradient(180deg,rgba(8,19,38,0),rgba(8,19,38,.88));
}

/* ---------- 12. Responsive ---------- */
@media (max-width:1180px){
  .nav-list a{padding:10px 9px;font-size:var(--fs-13)}
  .nav-seam{margin:0 8px}
  .header-inner{gap:14px}
}

@media (max-width:1023px){
  .site-header{position:sticky}
  .header-inner{justify-content:space-between;gap:12px;min-height:66px}
  .nav-toggle{display:inline-flex}
  .site-nav{
    position:absolute;left:0;right:0;top:100%;
    display:none;flex-direction:column;align-items:stretch;
    padding:8px var(--gutter) 20px;
    background:rgba(16,32,58,.99);
    border-top:1px solid var(--rock);
    border-bottom:1px solid var(--rock);
    box-shadow:0 20px 34px rgba(0,0,0,.5);
    max-height:calc(100vh - 70px);overflow-y:auto;
  }
  .site-nav[data-open]{display:flex}
  .nav-list{flex-direction:column;align-items:stretch;gap:0;width:100%}
  .nav-list--alt{margin-left:0;margin-top:8px;padding-top:8px;border-top:1px solid var(--rock)}
  .nav-seam{display:none}
  .nav-list a{
    min-height:48px;padding:12px 10px;
    font-size:var(--fs-17);
    border:0;border-bottom:1px solid rgba(43,54,72,.6);border-radius:0;
  }
  .nav-list a:hover,.nav-list a:focus-visible{background:rgba(57,196,110,.08);border-color:transparent;border-bottom-color:var(--turf)}
  .nav-list a[aria-current="page"]{border-color:transparent;border-bottom-color:var(--turf);background:rgba(57,196,110,.12)}
  .footer-top{grid-template-columns:1fr;gap:28px}
  .footer-nav{grid-template-columns:repeat(3,minmax(0,1fr))}
}

@media (max-width:900px){
  .grid--3{grid-template-columns:repeat(2,minmax(0,1fr))}
}

@media (max-width:767px){
  .header-tier{display:none}
  .footer-nav{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-group{--step:0px}
  .footer-legal{margin-left:0;width:100%}
  .eyebrow--vertical{writing-mode:horizontal-tb;transform:none;letter-spacing:.18em}
}

@media (max-width:640px){
  body{font-size:16px;line-height:1.8}
  .grid,.grid--2,.grid--3{grid-template-columns:1fr}
  .ladder > *:nth-child(n){margin-left:0}
  .brand-tag{display:none}
  .header-cta{min-height:40px;padding:8px 12px;font-size:var(--fs-12)}
  .contact-item--wide{grid-column:1 / -1}
  .footer-contact{grid-template-columns:1fr}
  .contact-note{font-size:var(--fs-12)}
}

@media (max-width:400px){
  .nav-toggle-label{display:none}
  .nav-toggle{padding:10px}
}

/* ---------- 13. 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;
  }
  .scroll-progress{display:none}
}