/* ==========================================================================
   安博体育中文索引站 · /assets/site.css
   0 Reset | 1 Tokens | 2 Typography | 3 Layout | 4 Header | 5 Footer
   6 Components | 7 Reveal & Motion | 8 Responsive
   ========================================================================== */

/* ---- 0. Reset ---- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,p,ul,ol,li,figure,blockquote,dl,dt,dd{margin:0;padding:0}
ul,ol{list-style:none}
img,svg,video{display:block;max-width:100%;height:auto}
button,input,select,textarea{font:inherit;color:inherit}
button{background:none;border:0;padding:0;cursor:pointer}
a{color:inherit;text-decoration:none}
table{border-collapse:collapse;width:100%}
[hidden]{display:none !important}

/* ---- 1. Tokens ---- */
:root{
  --c-void:#0A1D18;
  --c-panel:#102B24;
  --c-grid:#1E4038;
  --c-orange:#FF6B1A;
  --c-orange-soft:#FFA45C;
  --c-blue:#3DC7FF;
  --c-white:#F1F5F0;
  --c-muted:#9FB8AE;
  --c-amber:#E8B33C;
  --c-night:#051310;
  --c-ink:#08140F;
  --line-soft:rgba(30,64,56,.72);
  --line-softest:rgba(30,64,56,.38);
  --muted-soft:rgba(159,184,174,.72);
  --font-display:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-body:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono",monospace;
  --shell-max:1280px;
  --gutter:clamp(18px,4vw,56px);
  --bar-h:48px;
  --measure:38em;
  --ease:cubic-bezier(.22,.61,.36,1);
  --dur:.24s;
}

/* ---- 2. Typography & base ---- */
body{
  background:var(--c-void);
  color:var(--c-white);
  font-family:var(--font-body);
  font-size:16px;
  font-weight:400;
  line-height:1.75;
  letter-spacing:.01em;
  padding-bottom:calc(var(--bar-h) + 16px);
  -webkit-font-smoothing:antialiased;
}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.04em}
.num{font-family:var(--font-mono);font-variant-numeric:tabular-nums;font-weight:700;letter-spacing:.02em;color:var(--c-orange)}
.muted{color:var(--c-muted)}
.eyebrow{display:inline-block;font-family:var(--font-mono);font-size:12px;letter-spacing:.18em;text-transform:uppercase;color:var(--c-blue)}
.display{font-family:var(--font-display);font-weight:900;font-size:clamp(36px,6.2vw,76px);line-height:1.02;letter-spacing:-.02em}
.h1{font-family:var(--font-display);font-weight:900;font-size:clamp(30px,4.6vw,52px);line-height:1.08;letter-spacing:-.02em}
.h2{font-family:var(--font-display);font-weight:900;font-size:clamp(23px,2.8vw,34px);line-height:1.16;letter-spacing:-.01em}
.h3{font-size:24px;font-weight:700;line-height:1.3;letter-spacing:-.005em}
.lede{font-size:18px;line-height:1.7;max-width:var(--measure);color:var(--c-white)}
.prose{max-width:var(--measure);font-size:17px;line-height:1.8;color:var(--c-white)}
.prose p+p{margin-top:.9em}
.prose h2{margin:2em 0 .6em;font-family:var(--font-display);font-weight:900;font-size:24px;letter-spacing:-.01em}
.prose h3{margin:1.6em 0 .5em;font-size:18px;font-weight:700}
.prose ul{margin:.8em 0}
.prose li{position:relative;margin:.35em 0;padding-left:1.1em;color:var(--c-muted)}
.prose li::before{content:"";position:absolute;left:0;top:.78em;width:8px;height:1px;background:var(--c-orange)}
.prose strong{font-weight:700;color:var(--c-white)}
.prose a{color:var(--c-blue);text-decoration:underline;text-underline-offset:3px}
.prose a:hover{color:var(--c-orange)}
.visually-hidden{position:absolute;width:1px;height:1px;margin:-1px;padding:0;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
:focus-visible{outline:2px solid var(--c-blue);outline-offset:2px}

/* ---- 3. Layout ---- */
.shell{width:100%;max-width:var(--shell-max);margin:0 auto;padding-left:var(--gutter);padding-right:var(--gutter)}
#main-content{display:block;scroll-margin-top:24px}
.section{padding:clamp(48px,7vw,96px) 0}
.section--tight{padding:clamp(28px,4vw,52px) 0}
.rule{height:1px;border:0;background:var(--c-grid)}
.bevel{--bevel:26px;clip-path:polygon(0 0,100% 0,100% calc(100% - var(--bevel)),0 100%)}
.grid{display:grid;gap:clamp(20px,3vw,40px)}
.grid--split{grid-template-columns:5fr 8fr}
.grid--aside{grid-template-columns:3fr 7fr}
.grid--halves{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--trio{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid-field{background-image:linear-gradient(to right,var(--line-softest) 1px,transparent 1px),linear-gradient(to bottom,var(--line-softest) 1px,transparent 1px);background-size:72px 72px}

/* ---- 4. Header ---- */
.skip-link{position:absolute;top:-70px;left:16px;z-index:100;display:inline-flex;align-items:center;min-height:44px;padding:0 18px;background:var(--c-orange);color:var(--c-ink);font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;transition:top .18s var(--ease)}
.skip-link:focus{top:12px}
.site-header{position:relative;z-index:50;background:var(--c-void)}
.scroll-meter{position:fixed;top:0;left:0;right:0;height:2px;background:rgba(30,64,56,.85);z-index:90;pointer-events:none}
.scroll-meter__fill{display:block;width:0;height:100%;background:linear-gradient(90deg,var(--c-orange),var(--c-blue));transition:width .12s linear}
.header-top{background:var(--c-night);border-bottom:1px solid var(--c-grid)}
.header-top__inner{display:flex;align-items:center;justify-content:space-between;gap:16px;min-height:var(--bar-h);padding-top:4px;padding-bottom:4px}
.header-ident{display:flex;align-items:baseline;gap:10px;min-width:0}
.header-ident__brand{font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:var(--c-white);white-space:nowrap}
.header-ident__brand:hover{color:var(--c-orange)}
.header-ident__note{font-family:var(--font-mono);font-size:11px;letter-spacing:.04em;color:var(--muted-soft);white-space:nowrap}
.header-meta{display:flex;align-items:center;gap:16px;font-family:var(--font-mono);font-size:11px;letter-spacing:.04em;color:var(--muted-soft)}
.header-meta__link:hover{color:var(--c-blue);text-decoration:underline;text-underline-offset:3px}
.header-meta__icp{position:relative;padding-left:16px}
.header-meta__icp::before{content:"";position:absolute;left:0;top:50%;width:6px;height:1px;background:var(--c-grid)}
.header-main{background:linear-gradient(180deg,rgba(16,43,36,.6),rgba(10,29,24,0));border-bottom:1px solid var(--c-grid)}
.header-main__inner{display:flex;align-items:center;justify-content:space-between;gap:24px;min-height:76px}
.site-nav__list{display:flex;align-items:center;gap:clamp(12px,2.2vw,30px)}
.site-nav__link{position:relative;display:inline-flex;align-items:center;min-height:48px;padding:0 2px;font-size:15px;font-weight:500;color:var(--c-muted);transition:color .2s var(--ease)}
.site-nav__link::after{content:"";position:absolute;left:0;right:0;bottom:10px;height:2px;background:var(--c-orange);transform:scaleX(0);transform-origin:left center;transition:transform .22s var(--ease)}
.site-nav__link:hover{color:var(--c-white)}
.site-nav__link:hover::after{transform:scaleX(1)}
.site-nav__link[aria-current="page"]{color:var(--c-white);font-weight:700}
.site-nav__link[aria-current="page"]::after{transform:scaleX(1)}
.header-actions{display:flex;align-items:center;gap:12px}
.header-cta{white-space:nowrap}
.nav-toggle{display:none;align-items:center;gap:10px;min-height:48px;padding:0 14px;border:1px solid var(--c-grid);font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:var(--c-white)}
.nav-toggle:hover{border-color:var(--c-orange);color:var(--c-orange)}
.nav-toggle__bars{position:relative;display:block;width:16px;height:1px;background:currentColor;transition:background .2s var(--ease)}
.nav-toggle__bars::before,.nav-toggle__bars::after{content:"";position:absolute;left:0;width:16px;height:1px;background:currentColor;transition:transform .22s var(--ease)}
.nav-toggle__bars::before{top:-5px}
.nav-toggle__bars::after{top:5px}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars{background:transparent}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before{transform:translateY(5px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after{transform:translateY(-5px) rotate(-45deg)}

/* ---- 5. Footer ---- */
.site-footer{background:var(--c-night);border-top:1px solid var(--c-grid);color:var(--c-muted);font-size:14px}
.footer-head{display:flex;align-items:baseline;justify-content:space-between;gap:20px;flex-wrap:wrap;padding-top:clamp(36px,5vw,64px);padding-bottom:clamp(20px,3vw,32px);border-bottom:1px solid var(--c-grid)}
.footer-head__brand{display:flex;align-items:baseline;gap:12px;flex-wrap:wrap}
.footer-head__name{font-family:var(--font-display);font-size:20px;font-weight:900;letter-spacing:-.01em;color:var(--c-white)}
.footer-head__name:hover{color:var(--c-orange)}
.footer-head__tag{font-size:11px;letter-spacing:.16em;color:var(--c-orange)}
.footer-head__note{max-width:44ch;font-size:14px;color:var(--muted-soft)}
.footer-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:clamp(24px,4vw,56px);padding-top:clamp(28px,4vw,48px);padding-bottom:clamp(28px,4vw,48px);border-bottom:1px solid var(--c-grid)}
.footer-col__title{margin-bottom:14px;font-family:var(--font-mono);font-size:11px;font-weight:500;letter-spacing:.18em;text-transform:uppercase;color:var(--c-blue)}
.footer-col__note{margin-top:14px;font-size:12px;line-height:1.7;color:var(--muted-soft)}
.footer-nav{display:flex;flex-direction:column}
.footer-nav__item{border-bottom:1px solid var(--line-softest)}
.footer-nav__item:last-child{border-bottom:0}
.footer-nav__link{display:inline-flex;align-items:center;min-height:44px;font-size:14px;color:var(--c-muted);transition:color .2s var(--ease)}
.footer-nav__link:hover{color:var(--c-orange);text-decoration:underline;text-underline-offset:4px}
.footer-contact{display:flex;flex-direction:column}
.footer-contact__item{display:flex;flex-direction:column;gap:2px;padding:10px 0;border-bottom:1px solid var(--line-softest)}
.footer-contact__item:last-child{border-bottom:0}
.footer-contact__key{font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;color:var(--muted-soft)}
.footer-contact__val{font-size:14px;line-height:1.6;color:var(--c-white);word-break:break-word}
.footer-legal{display:flex;align-items:center;justify-content:space-between;gap:12px 24px;flex-wrap:wrap;padding-top:18px;padding-bottom:18px;font-family:var(--font-mono);font-size:11.5px;letter-spacing:.04em;color:var(--muted-soft)}
.footer-legal__links{display:flex;flex-wrap:wrap;gap:8px 18px}
.footer-legal__link:hover{color:var(--c-blue);text-decoration:underline;text-underline-offset:3px}
.footer-bar{position:fixed;left:0;right:0;bottom:0;z-index:80;background:var(--c-night);border-top:1px solid var(--c-grid)}
.footer-bar__inner{display:flex;align-items:center;gap:14px;min-height:var(--bar-h);font-family:var(--font-mono);font-size:11px;letter-spacing:.04em;color:var(--muted-soft)}
.footer-bar__icp{display:inline-flex;align-items:center;gap:8px;color:var(--c-white);white-space:nowrap}
.footer-bar__icp::before{content:"";width:6px;height:6px;background:var(--c-orange);flex:none}
.footer-bar__note{overflow:hidden;white-space:nowrap;text-overflow:ellipsis}

/* ---- 6. Components ---- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:48px;padding:0 20px;border:1px solid var(--c-grid);font-size:15px;font-weight:600;letter-spacing:.01em;color:var(--c-white);background:transparent;transition:background .2s var(--ease),border-color .2s var(--ease),color .2s var(--ease)}
.btn--primary{background:var(--c-orange);border-color:var(--c-orange);color:var(--c-ink)}
.btn--primary:hover{background:var(--c-orange-soft);border-color:var(--c-orange-soft)}
.btn--ghost:hover{border-color:var(--c-orange);color:var(--c-orange)}
.btn--quiet{min-height:44px;padding:0 10px;border-color:transparent;font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;color:var(--c-blue)}
.btn--quiet:hover{color:var(--c-orange)}

.switch{display:inline-flex;align-items:center;gap:10px;min-height:44px;padding:0 4px;font-family:var(--font-mono);font-size:11px;letter-spacing:.06em;color:var(--muted-soft)}
.switch__track{position:relative;flex:none;width:34px;height:16px;border:1px solid var(--c-grid);background:var(--c-panel);transition:background .2s var(--ease),border-color .2s var(--ease)}
.switch__dot{position:absolute;top:1px;left:1px;width:12px;height:12px;background:var(--c-muted);transition:transform .2s var(--ease),background .2s var(--ease)}
.switch[aria-checked="true"] .switch__track{border-color:var(--c-orange);background:rgba(255,107,26,.16)}
.switch[aria-checked="true"] .switch__dot{transform:translateX(18px);background:var(--c-orange)}
.switch__state{color:var(--c-white)}
.switch__label--short{display:none}
.switch:hover .switch__label--long,.switch:hover .switch__label--short{color:var(--c-white)}

.tag{display:inline-flex;align-items:center;gap:6px;min-height:24px;padding:0 8px;border:1px solid var(--c-grid);font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;color:var(--c-muted)}
.tag--live{color:var(--c-orange);border-color:rgba(255,107,26,.45)}
.tag--amber{color:var(--c-amber);border-color:rgba(232,179,60,.4)}
.tag--blue{color:var(--c-blue);border-color:rgba(61,199,255,.35)}

.breadcrumb{display:flex;align-items:center;flex-wrap:wrap;gap:8px;font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;color:var(--muted-soft)}
.breadcrumb__link{color:var(--c-muted)}
.breadcrumb__link:hover{color:var(--c-blue);text-decoration:underline;text-underline-offset:3px}
.breadcrumb__sep{color:var(--c-grid)}

.panel{background:var(--c-panel);border:1px solid var(--c-grid)}
.panel__head{display:flex;align-items:baseline;justify-content:space-between;gap:16px;padding:14px 20px;border-bottom:1px solid var(--c-grid)}
.panel__title{font-family:var(--font-mono);font-size:12px;letter-spacing:.16em;text-transform:uppercase;color:var(--c-white)}
.panel__note{font-family:var(--font-mono);font-size:11px;letter-spacing:.04em;color:var(--muted-soft)}
.panel__body{padding:clamp(16px,2.4vw,24px)}

.index-list{border-top:1px solid var(--c-grid)}
.index-list__row{display:grid;grid-template-columns:64px minmax(0,1fr) auto;align-items:baseline;gap:clamp(12px,2vw,24px);padding:14px 8px;border-bottom:1px solid var(--c-grid);transition:background .2s var(--ease)}
.index-list__row:hover{background:rgba(30,64,56,.45)}
.index-list__num{font-family:var(--font-mono);font-size:14px;font-weight:700;letter-spacing:.04em;color:var(--c-orange)}
.index-list__main{font-size:17px;font-weight:600;color:var(--c-white)}
.index-list__meta{font-family:var(--font-mono);font-size:12px;letter-spacing:.04em;color:var(--muted-soft);text-align:right}

.kv-table{border-top:1px solid var(--c-grid)}
.kv-table__row{display:grid;grid-template-columns:minmax(76px,1fr) 1.7fr;gap:16px;padding:10px 0;border-bottom:1px solid var(--line-soft)}
.kv-table__k{font-family:var(--font-mono);font-size:12px;letter-spacing:.04em;color:var(--muted-soft)}
.kv-table__v{font-size:15px;color:var(--c-white)}

.path{position:relative;margin-left:5px;padding-left:32px;border-left:1px solid var(--c-grid)}
.path__step{position:relative;padding-bottom:clamp(20px,3vw,34px)}
.path__step:last-child{padding-bottom:0}
.path__step::before{content:"";position:absolute;left:-37px;top:8px;width:9px;height:9px;background:var(--c-void);border:1px solid var(--c-orange)}
.path__step[data-state="done"]::before{background:var(--c-orange)}
.path__num{display:block;font-family:var(--font-mono);font-size:12px;letter-spacing:.12em;color:var(--c-orange)}
.path__title{margin:2px 0 4px;font-size:18px;font-weight:700;color:var(--c-white)}
.path__text{max-width:36em;font-size:15px;color:var(--c-muted)}

.tabs__list{display:flex;flex-wrap:wrap;gap:2px;border-bottom:1px solid var(--c-grid)}
.tabs__tab{position:relative;min-height:48px;padding:0 18px;font-size:15px;font-weight:600;color:var(--c-muted);border:1px solid transparent;border-bottom:0;transition:color .2s var(--ease),background .2s var(--ease)}
.tabs__tab:hover{color:var(--c-white)}
.tabs__tab[aria-selected="true"]{color:var(--c-white);background:var(--c-panel);border-color:var(--c-grid)}
.tabs__tab[aria-selected="true"]::after{content:"";position:absolute;top:-1px;left:0;right:0;height:2px;background:var(--c-orange)}
.tabs__panel{padding:clamp(18px,3vw,28px) 0}
.tabs__panel[data-enter]{animation:panel-in .24s var(--ease) both}
@keyframes panel-in{from{opacity:0;transform:translateY(4px)}to{opacity:1;transform:translateY(0)}}

.disclosure{background:var(--c-panel);border:1px solid var(--c-grid)}
.disclosure__toggle{display:flex;align-items:center;justify-content:space-between;gap:16px;width:100%;min-height:52px;padding:0 18px;font-family:var(--font-mono);font-size:12px;letter-spacing:.12em;text-transform:uppercase;color:var(--c-white)}
.disclosure__toggle:hover{color:var(--c-orange)}
.disclosure__icon{font-family:var(--font-mono);font-size:16px;line-height:1;color:var(--c-orange);transition:transform .22s var(--ease)}
.disclosure__toggle[aria-expanded="true"] .disclosure__icon{transform:rotate(45deg)}
.disclosure__panel{overflow:hidden;transition:height .26s var(--ease)}
.disclosure__inner{padding:4px 18px 20px;border-top:1px solid var(--line-soft)}

.figure{position:relative;margin:0}
.figure__frame{position:relative;overflow:hidden;background:var(--c-panel);border:1px solid var(--c-grid);aspect-ratio:16/9}
.figure__frame--tall{aspect-ratio:4/5}
.figure__frame--wide{aspect-ratio:21/9}
.figure__frame--bevel{--bevel:24px;clip-path:polygon(0 0,100% 0,100% calc(100% - var(--bevel)),0 100%)}
.figure__frame img{width:100%;height:100%;object-fit:cover;filter:saturate(.72) contrast(1.06)}
.figure__frame::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(10,29,24,0) 42%,rgba(5,19,16,.86));pointer-events:none}
.figure__frame--empty{display:flex;align-items:center;justify-content:center;background-image:linear-gradient(to right,var(--line-softest) 1px,transparent 1px),linear-gradient(to bottom,var(--line-softest) 1px,transparent 1px);background-size:44px 44px}
.figure__frame--empty::before{content:attr(data-label);font-family:var(--font-mono);font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:var(--muted-soft)}
.figure__frame--empty::after{display:none}
.figure__cap{display:flex;align-items:baseline;justify-content:space-between;gap:14px;margin-top:12px;padding-top:10px;border-top:1px solid var(--c-grid);font-family:var(--font-mono);font-size:11.5px;letter-spacing:.04em;color:var(--muted-soft)}

/* ---- 7. Reveal & motion ---- */
html.has-js [data-reveal]{opacity:0;transform:translateY(14px);transition:opacity .5s var(--ease),transform .5s var(--ease)}
html.has-js [data-reveal].is-visible{opacity:1;transform:translateY(0)}

/* ---- 8. Responsive ---- */
@media (max-width:1100px){
  .grid--split{grid-template-columns:1fr 1.6fr}
  .grid--aside{grid-template-columns:1fr 2fr}
}
@media (max-width:900px){
  .header-main__inner{flex-wrap:wrap;gap:10px;min-height:64px;padding-bottom:0}
  .header-actions{order:1;width:100%;justify-content:space-between}
  .nav-toggle{display:inline-flex}
  .site-nav{order:2;flex:1 1 100%;max-height:0;opacity:0;visibility:hidden;overflow:hidden;border-top:1px solid transparent;transition:max-height .28s var(--ease),opacity .28s var(--ease),visibility .28s var(--ease),border-color .28s var(--ease)}
  .site-nav[data-open]{max-height:70vh;opacity:1;visibility:visible;overflow-y:auto;border-top-color:var(--c-grid)}
  .site-nav__list{flex-direction:column;align-items:stretch;gap:0;padding:6px 0 16px}
  .site-nav__item{border-bottom:1px solid var(--line-softest)}
  .site-nav__item:last-child{border-bottom:0}
  .site-nav__link{width:100%;min-height:52px;font-size:17px}
  .site-nav__link::after{bottom:0}
  .grid--split,.grid--aside,.grid--trio{grid-template-columns:minmax(0,1fr)}
}
@media (max-width:760px){
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:640px){
  .header-meta{display:none}
  .header-ident__note{display:none}
  .switch__label--long{display:none}
  .switch__label--short{display:inline}
  .prose,.lede{font-size:16px}
  .index-list__row{grid-template-columns:44px minmax(0,1fr);row-gap:4px}
  .index-list__meta{grid-column:2;text-align:left}
}
@media (max-width:460px){
  .footer-grid{grid-template-columns:minmax(0,1fr)}
  .footer-bar__note{display:none}
  .footer-legal{font-size:11px}
}
@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.has-js [data-reveal]{opacity:1;transform:none;transition:none}
  .scroll-meter__fill{transition:none}
}