/* =========================================================
   /assets/site.css — 亿兆体育 · 双语导览台 共享样式
   1 reset / 2 变量 / 3 基础排版 / 4 布局原语 / 5 头部
   6 页脚 / 7 组件 / 8 图像容器 / 9 动效 / 10 响应式
   ========================================================= */

/* ---------- 1. reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{text-size-adjust:100%;-webkit-text-size-adjust:100%}
body{margin:0}
h1,h2,h3,h4,h5,p,figure,blockquote,dl,dd,ul,ol{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,video,picture{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer}
[hidden]{display:none!important}
::selection{background:var(--ice);color:var(--ink-deep)}

/* ---------- 2. 变量 ---------- */
:root{
  --ink:#0E3B36;
  --ink-deep:#071F1C;
  --frost:#F4F7F6;
  --white:#FFFFFF;
  --ice:#3FA9F5;
  --ice-soft:#8FD6FA;
  --gold:#FFB703;
  --char:#1A1D1F;
  --gray:#5C6B69;
  --wine:#7A2E3A;

  --line-dark:rgba(244,247,246,.14);
  --line-light:rgba(26,29,31,.13);

  --font-display:"PingFang SC","Hiragino Sans GB","Source Han Sans SC","Noto Sans CJK SC","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"PingFang SC","Hiragino Sans GB","Source Han Sans SC","Noto Sans CJK SC","Microsoft YaHei",system-ui,sans-serif;
  --font-latin:system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  --font-mono:ui-monospace,SFMono-Regular,Menlo,Consolas,"Courier New",monospace;

  --fs-display:clamp(44px,8.4vw,96px);
  --fs-h1:clamp(30px,5vw,64px);
  --fs-h2:clamp(30px,3.6vw,44px);
  --fs-h3:clamp(22px,2.6vw,30px);
  --fs-h4:22px;
  --fs-lead:18px;
  --fs-body:16px;
  --fs-note:14px;
  --fs-label:12px;

  --gutter:clamp(16px,4vw,48px);
  --maxw:1320px;
  --ease:cubic-bezier(.22,1,.36,1);
}

/* ---------- 3. 基础排版 ---------- */
body{
  font-family:var(--font-body);
  font-size:var(--fs-body);
  line-height:1.75;
  color:var(--char);
  background:var(--frost);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
h1,h2,h3,h4{font-family:var(--font-display);font-weight:800;line-height:1.08;letter-spacing:-.02em}
h1{font-size:var(--fs-h1)}
h2{font-size:var(--fs-h2)}
h3{font-size:var(--fs-h3)}
h4{font-size:var(--fs-h4)}
p{max-width:36em}
strong{font-weight:700}
:focus-visible{outline:2px solid var(--ice);outline-offset:3px;border-radius:2px}
.site-header :focus-visible,.site-footer :focus-visible{outline-color:var(--gold)}
.skip-link{
  position:absolute;left:12px;top:-120px;z-index:200;
  display:inline-block;padding:10px 18px;
  background:var(--gold);color:var(--ink-deep);
  font-family:var(--font-mono);font-size:var(--fs-label);letter-spacing:.08em;font-weight:700;
  transition:top .2s var(--ease);
}
.skip-link:focus{top:10px}
#main-content{display:block;scroll-margin-top:96px}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.06em}
.status-dot{
  display:inline-block;width:7px;height:7px;flex:none;border-radius:50%;
  background:var(--gold);box-shadow:0 0 0 3px rgba(255,183,3,.2);
}

/* 语言层：由头部双态开关通过 html[data-lang] 控制 */
[data-lang="en"] .lang-zh{display:none}
[data-lang="zh"] .lang-en{display:none}

/* ---------- 4. 布局原语 ---------- */
.container{width:100%;max-width:var(--maxw);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-block:clamp(48px,7vw,96px)}
.section--dark{background:var(--ink);color:var(--frost)}
.section--abyss{background:var(--ink-deep);color:var(--frost)}
.section--frost{background:var(--frost);color:var(--char)}
.section--white{background:var(--white);color:var(--char)}
.section--wine{background:var(--wine);color:var(--frost)}
.section__head{display:grid;gap:12px;margin-bottom:clamp(24px,3vw,40px);max-width:48em}
.section-index{
  display:block;font-family:var(--font-mono);font-size:var(--fs-label);
  letter-spacing:.18em;color:var(--ice);
}
.section--frost .section-index,.section--white .section-index{color:var(--wine)}
.section__title{font-size:var(--fs-h2);max-width:22em}
.eyebrow{
  font-family:var(--font-mono);font-size:var(--fs-label);letter-spacing:.18em;
  text-transform:uppercase;color:var(--ice-soft);
}
.section--frost .eyebrow,.section--white .eyebrow{color:var(--wine)}
.lead{font-size:var(--fs-lead);line-height:1.7;max-width:34em;opacity:.88}
.prose{display:grid;gap:1em;max-width:34em;font-size:var(--fs-body);line-height:1.75}
.rule{height:1px;border:0;background:var(--line-light);margin-block:clamp(20px,3vw,32px)}
.rule--dark{background:var(--line-dark)}
.grid{display:grid;gap:clamp(20px,3vw,40px)}
.grid--5-7{grid-template-columns:minmax(0,5fr) minmax(0,7fr)}
.grid--4-8{grid-template-columns:minmax(0,4fr) minmax(0,8fr)}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}

/* ---------- 5. 头部 ---------- */
.site-header{
  position:sticky;top:0;z-index:60;isolation:isolate;
  background:linear-gradient(180deg,#0A2A26 0%,var(--ink-deep) 100%);
  color:var(--frost);
  border-bottom:1px solid var(--line-dark);
  box-shadow:0 1px 0 rgba(63,169,245,.18);
}
.site-header::after{
  content:"";position:absolute;top:0;left:0;height:3px;width:min(46%,560px);
  background:linear-gradient(90deg,var(--ice) 0%,rgba(63,169,245,.35) 72%,transparent 100%);
  clip-path:polygon(0 0,100% 0,calc(100% - 26px) 100%,0 100%);
  pointer-events:none;
}
.header-progress{
  position:absolute;left:0;right:0;bottom:0;height:2px;
  background:rgba(244,247,246,.09);pointer-events:none;
}
.header-progress__bar{
  display:block;height:100%;width:100%;
  transform:scaleX(0);transform-origin:0 50%;
  background:linear-gradient(90deg,var(--ice),var(--gold));
}
.header-inner{
  max-width:var(--maxw);margin-inline:auto;
  padding:10px var(--gutter) 12px;
  display:flex;align-items:flex-start;justify-content:space-between;gap:20px;
  transition:padding .25s var(--ease);
}
.brand{display:flex;align-items:center;min-width:0;flex:none}
.brand__link{display:inline-flex;align-items:center;gap:12px;color:var(--frost)}
.brand__mark{
  display:grid;place-items:center;flex:none;width:40px;height:40px;
  font-family:var(--font-display);font-weight:800;font-size:22px;line-height:1;
  color:var(--ink-deep);
  background:linear-gradient(135deg,var(--ice) 0%,var(--ice-soft) 100%);
  clip-path:polygon(0 0,100% 0,100% calc(100% - 12px),calc(100% - 12px) 100%,0 100%);
  transition:background .2s var(--ease),color .2s var(--ease);
}
.brand__link:hover .brand__mark{background:linear-gradient(135deg,var(--gold) 0%,#FFD469 100%)}
.brand__text{display:flex;flex-direction:column;line-height:1.12;min-width:0}
.brand__name{
  font-family:var(--font-display);font-weight:800;font-size:26px;letter-spacing:-.03em;
  transform:scaleX(.94);transform-origin:left center;
  transition:font-size .25s var(--ease);
}
.brand__sub{
  margin-top:3px;font-family:var(--font-mono);font-size:var(--fs-label);
  letter-spacing:.1em;text-transform:uppercase;color:var(--ice-soft);
}
.nav-toggle{
  display:none;align-items:center;gap:10px;margin-left:auto;
  padding:9px 14px;border:1px solid var(--line-dark);
  font-family:var(--font-mono);font-size:var(--fs-label);letter-spacing:.14em;text-transform:uppercase;
  transition:border-color .2s,color .2s;
}
.nav-toggle:hover{border-color:var(--ice);color:var(--ice-soft)}
.nav-toggle__bars{display:grid;gap:5px;width:18px}
.nav-toggle__bar{display:block;height:2px;background:var(--ice);transition:transform .25s var(--ease)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:first-child{transform:translateY(3.5px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:last-child{transform:translateY(-3.5px) rotate(-45deg)}
.site-nav{
  display:flex;flex-direction:column;align-items:flex-end;gap:4px;
  margin-left:auto;min-width:0;max-width:100%;
}
.utility{
  display:flex;align-items:center;flex-wrap:wrap;justify-content:flex-end;gap:14px;
  min-height:52px;
  font-family:var(--font-mono);font-size:var(--fs-label);letter-spacing:.06em;
  color:var(--ice-soft);
  transition:min-height .25s var(--ease),opacity .25s var(--ease);
}
.utility__sep{width:1px;height:14px;background:var(--line-dark)}
.utility__status{display:inline-flex;align-items:center;gap:8px;max-width:none;color:rgba(244,247,246,.92)}
.utility__fav{display:inline-flex;align-items:center;gap:6px;max-width:none}
.utility__count{color:var(--gold);font-weight:700;font-variant-numeric:tabular-nums}
.lang-switch{
  display:inline-flex;align-items:center;
  border:1px solid var(--line-dark);background:rgba(63,169,245,.1);
}
.lang-switch__btn{
  padding:4px 10px;line-height:1.5;
  font-family:var(--font-mono);font-size:var(--fs-label);letter-spacing:.08em;
  color:var(--ice-soft);
  transition:background-color .2s,color .2s;
}
.lang-switch__btn.is-active{background:var(--ice);color:var(--ink-deep);font-weight:700}
.lang-switch__btn:not(.is-active):hover{background:rgba(63,169,245,.25);color:var(--frost)}
.nav-list{display:flex;flex-wrap:wrap;align-items:center;justify-content:flex-end;gap:clamp(8px,1.4vw,22px)}
.nav-list__item{min-width:0}
.nav-link{
  position:relative;display:inline-flex;align-items:center;gap:8px;
  padding:6px 2px;font-size:var(--fs-note);font-weight:500;
  color:rgba(244,247,246,.8);
  transition:color .2s;
}
.nav-link::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:2px;
  background:var(--ice);transform:scaleX(0);transform-origin:left;
  transition:transform .25s var(--ease),background-color .2s;
}
.nav-link:hover{color:var(--frost)}
.nav-link:hover::after{transform:scaleX(1)}
.nav-link[aria-current="page"]{color:var(--frost);font-weight:700}
.nav-link[aria-current="page"]::after{transform:scaleX(1);background:var(--gold)}
.nav-link__num{
  display:none;font-family:var(--font-mono);font-size:var(--fs-label);
  letter-spacing:.06em;color:var(--gold);font-weight:400;
}
/* 滚动后工具条收为细带 */
.site-header[data-scrolled] .header-inner{padding-top:6px;padding-bottom:8px}
.site-header[data-scrolled] .utility{min-height:40px;opacity:.92}
.site-header[data-scrolled] .brand__name{font-size:22px}
.site-header[data-scrolled]{box-shadow:0 10px 30px rgba(7,31,28,.45)}

/* ---------- 6. 页脚 ---------- */
.site-footer{
  position:relative;
  background:var(--ink-deep);
  color:rgba(244,247,246,.78);
  overflow:hidden;
}
.site-footer::before{
  content:"";position:absolute;top:14px;right:-60px;width:min(52%,620px);height:1px;
  background:linear-gradient(90deg,transparent,rgba(63,169,245,.55));
  transform:rotate(-4deg);transform-origin:right center;pointer-events:none;
}
.footer-ruler{
  height:14px;
  background:
    repeating-linear-gradient(90deg,rgba(143,214,250,.5) 0 1px,transparent 1px 14px),
    linear-gradient(90deg,rgba(63,169,245,.5),rgba(255,183,3,.5));
  background-size:auto,100% 2px;
  background-repeat:repeat-x,no-repeat;
  background-position:0 0,0 0;
  opacity:.7;
}
.footer-grid{
  max-width:var(--maxw);margin-inline:auto;
  padding:clamp(36px,5.5vw,68px) var(--gutter) clamp(24px,3.5vw,40px);
  display:grid;grid-template-columns:1.4fr 1.1fr .9fr 1fr;
  gap:clamp(24px,4vw,56px);
}
.footer-col{min-width:0}
.footer-brand__name{
  font-family:var(--font-display);font-weight:800;font-size:var(--fs-h3);
  letter-spacing:-.02em;line-height:1.1;color:var(--frost);
}
.footer-brand__sub{
  margin-top:8px;font-family:var(--font-mono);font-size:var(--fs-label);
  letter-spacing:.12em;text-transform:uppercase;color:var(--ice-soft);
}
.footer-brand__note{
  margin-top:14px;max-width:26em;font-size:var(--fs-note);line-height:1.7;
  color:rgba(244,247,246,.62);
}
.footer-title{
  font-family:var(--font-mono);font-size:var(--fs-label);font-weight:700;
  letter-spacing:.16em;text-transform:uppercase;color:var(--gold);
  margin-bottom:14px;
}
.footer-title--sub{margin-top:24px}
.footer-list{display:grid;gap:8px;font-size:var(--fs-note);line-height:1.6}
.footer-list li{max-width:none}
.footer-list__key{
  display:inline-block;min-width:4.8em;
  font-family:var(--font-mono);font-size:var(--fs-label);letter-spacing:.06em;
  color:rgba(244,247,246,.42);
}
.footer-nav{display:grid;gap:8px;font-size:var(--fs-note);line-height:1.6}
.footer-link{
  display:inline-block;color:rgba(244,247,246,.86);
  border-bottom:1px solid rgba(63,169,245,.32);
  transition:color .2s,border-color .2s;
}
.footer-link:hover{color:var(--ice-soft);border-color:var(--gold)}
.footer-cta{margin-top:18px;max-width:none}
.footer-meta{display:grid;gap:10px;font-size:var(--fs-note);line-height:1.6}
.footer-meta__addr{max-width:none;color:rgba(244,247,246,.62)}
.footer-badge{
  display:inline-flex;align-items:center;padding:5px 11px;width:max-content;max-width:100%;
  background:var(--wine);color:var(--frost);
  font-family:var(--font-mono);font-size:var(--fs-label);letter-spacing:.06em;
  clip-path:polygon(0 0,100% 0,100% calc(100% - 8px),calc(100% - 8px) 100%,0 100%);
}
.footer-base{
  max-width:var(--maxw);margin-inline:auto;
  padding:16px var(--gutter) 26px;
  border-top:1px solid var(--line-dark);
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:10px 24px;
  font-family:var(--font-mono);font-size:var(--fs-label);letter-spacing:.06em;
  color:rgba(244,247,246,.5);
}
.footer-base p{max-width:none}
.footer-base__status{display:inline-flex;align-items:center;gap:8px}

/* ---------- 7. 组件 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.5em;
  padding:13px 26px;border:1px solid transparent;
  font-family:var(--font-body);font-size:var(--fs-note);font-weight:700;letter-spacing:.02em;
  clip-path:polygon(0 0,100% 0,100% calc(100% - 12px),calc(100% - 12px) 100%,0 100%);
  transition:background-color .2s,color .2s,border-color .2s;
}
.btn--primary{background:var(--ice);color:var(--ink-deep)}
.btn--primary:hover{background:var(--ice-soft)}
.btn--gold{background:var(--gold);color:var(--char)}
.btn--gold:hover{background:#FFD469}
.btn--ghost{background:transparent;border-color:rgba(244,247,246,.38);color:var(--frost)}
.btn--ghost:hover{border-color:var(--ice);color:var(--ice-soft)}
.link-arrow{
  display:inline-flex;align-items:center;gap:8px;
  color:var(--ice);font-weight:600;
  border-bottom:1px solid rgba(63,169,245,.35);
  transition:color .2s,border-color .2s;
}
.link-arrow::after{content:"→";transition:color .2s}
.link-arrow:hover{color:var(--gold);border-color:var(--gold)}
.panel{
  background:var(--white);border:1px solid var(--line-light);
  padding:clamp(18px,2.4vw,28px);
  clip-path:polygon(0 0,100% 0,100% calc(100% - 18px),calc(100% - 18px) 100%,0 100%);
}
.panel--dark{
  background:rgba(63,169,245,.09);border-color:var(--line-dark);color:var(--frost);
}
.tag{
  display:inline-flex;align-items:center;gap:6px;padding:4px 10px;
  border:1px solid var(--line-light);
  font-family:var(--font-mono);font-size:var(--fs-label);letter-spacing:.08em;text-transform:uppercase;
  color:var(--gray);
}
.tag--gold{border-color:rgba(255,183,3,.55);background:rgba(255,183,3,.14);color:#7A5600}
.tag--wine{background:var(--wine);border-color:transparent;color:var(--frost)}
.stat{display:grid;gap:4px}
.stat__num{
  font-family:var(--font-latin);font-size:var(--fs-h2);font-weight:800;line-height:1;
  font-variant-numeric:tabular-nums;letter-spacing:-.02em;color:var(--gold);
}
.stat__label{
  font-family:var(--font-mono);font-size:var(--fs-label);letter-spacing:.1em;
  text-transform:uppercase;opacity:.7;
}
.breadcrumbs{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  padding-block:14px;
  font-family:var(--font-mono);font-size:var(--fs-label);letter-spacing:.06em;
  color:var(--gray);
}
.breadcrumbs a{color:var(--gray);border-bottom:1px solid transparent;transition:color .2s,border-color .2s}
.breadcrumbs a:hover{color:var(--ice);border-color:var(--ice)}
.breadcrumbs__sep{opacity:.45}
.breadcrumbs [aria-current="page"]{color:var(--char)}
.section--dark .breadcrumbs,.section--abyss .breadcrumbs{color:rgba(244,247,246,.6)}
.section--dark .breadcrumbs a,.section--abyss .breadcrumbs a{color:rgba(244,247,246,.75)}
.section--dark .breadcrumbs [aria-current="page"],.section--abyss .breadcrumbs [aria-current="page"]{color:var(--frost)}

/* ---------- 8. 图像容器 ---------- */
.media-figure{display:grid;gap:8px;margin:0}
.media{
  position:relative;overflow:hidden;
  aspect-ratio:16/10;
  background:linear-gradient(135deg,#0E3B36 0%,#12514A 46%,#082521 100%);
  clip-path:polygon(0 0,100% 0,100% calc(100% - 24px),calc(100% - 24px) 100%,0 100%);
}
.media::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:
    linear-gradient(115deg,rgba(63,169,245,.3) 0%,rgba(63,169,245,0) 52%),
    repeating-linear-gradient(115deg,rgba(244,247,246,.07) 0 2px,transparent 2px 22px);
}
.media img{width:100%;height:100%;object-fit:cover}
.media--wide{aspect-ratio:21/9}
.media--tall{aspect-ratio:3/4}
.media--square{aspect-ratio:1/1}
.media-caption{
  font-family:var(--font-mono);font-size:var(--fs-label);letter-spacing:.06em;
  color:var(--gray);line-height:1.6;max-width:none;
}
.section--dark .media-caption,.section--abyss .media-caption{color:rgba(244,247,246,.55)}

/* ---------- 9. 动效 ---------- */
[data-reveal]{
  opacity:0;transform:translate(10px,16px);
  transition:opacity .6s var(--ease),transform .6s var(--ease);
  will-change:opacity,transform;
}
[data-reveal].is-visible{opacity:1;transform:none}
@media (prefers-reduced-motion: no-preference){
  html{scroll-behavior:smooth}
}

/* ---------- 10. 响应式 ---------- */
@media (max-width:1080px){
  .footer-grid{grid-template-columns:1.2fr 1fr 1fr}
  .footer-col.footer-brand{grid-column:1 / -1}
}
@media (max-width:900px){
  .grid--5-7,.grid--4-8{grid-template-columns:1fr}
  .nav-toggle{display:inline-flex}
  .header-inner{align-items:center;padding:10px var(--gutter)}
  .site-nav{
    position:absolute;left:0;right:0;top:100%;
    display:flex;flex-direction:column;align-items:stretch;gap:0;
    background:var(--ink-deep);
    border-bottom:1px solid var(--line-dark);
    box-shadow:0 26px 48px rgba(0,0,0,.5);
    padding:6px var(--gutter) 22px;
    max-height:calc(100vh - 72px);
    max-height:calc(100dvh - 72px);
    overflow-y:auto;
    opacity:0;visibility:hidden;transform:translateY(-10px);
    transition:opacity .22s var(--ease),transform .22s var(--ease),visibility .22s var(--ease);
  }
  .site-nav[data-open]{opacity:1;visibility:visible;transform:translateY(0)}
  .utility{
    justify-content:flex-start;min-height:0;
    padding:12px 0 14px;gap:12px;
    border-bottom:1px solid var(--line-dark);
  }
  .site-header[data-scrolled] .utility{min-height:0}
  .utility__status{flex:1 1 auto}
  .nav-list{flex-direction:column;align-items:stretch;gap:0;margin-top:6px}
  .nav-list__item{border-bottom:1px solid rgba(244,247,246,.08)}
  .nav-link{
    justify-content:flex-start;width:100%;
    padding:14px 4px;font-size:var(--fs-h4);font-weight:600;
  }
  .nav-link::after{display:none}
  .nav-link__num{display:inline-block;min-width:2.2em}
  .nav-link[aria-current="page"]{color:var(--gold)}
  .site-header[data-scrolled] .brand__name{font-size:22px}
  .footer-grid{grid-template-columns:1fr 1fr}
  .footer-col.footer-brand{grid-column:1 / -1}
  .footer-base{flex-direction:column;align-items:flex-start}
}
@media (max-width:720px){
  .grid--3,.grid--2{grid-template-columns:1fr}
  .brand__name{font-size:22px}
  .brand__sub{font-size:10px;letter-spacing:.08em}
  .brand__mark{width:34px;height:34px;font-size:19px}
  .media{clip-path:polygon(0 0,100% 0,100% calc(100% - 16px),calc(100% - 16px) 100%,0 100%)}
  .footer-grid{grid-template-columns:1fr;gap:28px}
  .footer-list__key{min-width:4.2em}
}
@media (max-width:400px){
  .utility__sep{display:none}
  .brand__link{gap:9px}
}
@media (prefers-reduced-motion: reduce){
  *,*::before,*::after{
    animation-duration:.001ms!important;
    animation-iteration-count:1!important;
    transition-duration:.001ms!important;
    scroll-behavior:auto!important;
  }
  [data-reveal]{opacity:1!important;transform:none!important}
  .site-nav{transition:none}
}