/* ============================================================
   LEYU 体育 · 共享样式 / assets/site.css
   深墨蓝基底 · 荧光青信号 · 赛场橙入口 · 极细边界
   ============================================================ */

:root{
  --c-abyss:#071321;
  --c-night:#0B1C2F;
  --c-night-2:#0d2437;
  --c-cyan:#22E6D2;
  --c-orange:#FF6B2C;
  --c-ice:#7ED7FF;
  --c-steel:#637386;
  --c-mist:#C9D2DC;
  --c-paper:#F7F3EA;
  --c-green:#3ED598;
  --c-amber:#FFB648;

  --line:rgba(99,115,134,.30);
  --line-soft:rgba(99,115,134,.16);
  --line-signal:rgba(34,230,210,.34);

  --shadow-1:0 22px 48px -34px rgba(0,0,0,.95);
  --shadow-2:0 0 0 1px rgba(126,215,255,.06), 0 34px 64px -42px rgba(0,0,0,1);

  --wrap:1240px;
  --gut:clamp(18px,4vw,44px);
  --header-h:88px;

  --font-display:"Barlow Condensed","Noto Sans SC","Source Han Sans SC",system-ui,sans-serif;
  --font-body:"Noto Sans SC","Source Han Sans SC",system-ui,-apple-system,"PingFang SC","Microsoft YaHei",sans-serif;
  --font-mono:"IBM Plex Mono","JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,monospace;

  --ease:cubic-bezier(.2,.7,.2,1);
}

@media (max-width:959px){
  :root{--header-h:76px;}
}

/* ---------------- reset ---------------- */
*,*::before,*::after{box-sizing:border-box}

html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:calc(var(--header-h) + 20px);
  background:#071321;
}

body,h1,h2,h3,h4,h5,p,figure,blockquote,dl,dd,pre{margin:0}
ul[class],ol[class]{list-style:none;margin:0;padding:0}
img,svg,video{display:block;max-width:100%}
button{font:inherit;color:inherit;background:none;border:0}
a{color:inherit;text-decoration:none}
table{border-collapse:collapse;width:100%}
:focus-visible{outline:2px solid var(--c-cyan);outline-offset:3px}

/* ---------------- base ---------------- */
body{
  min-height:100vh;
  padding-top:var(--header-h);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.75;
  color:var(--c-paper);
  background-color:var(--c-abyss);
  background-image:
    radial-gradient(1200px 620px at 84% -12%, rgba(34,230,210,.10), transparent 62%),
    radial-gradient(900px 520px at -6% 0%, rgba(255,107,44,.075), transparent 64%);
  background-repeat:no-repeat;
  background-attachment:scroll;
  -webkit-font-smoothing:antialiased;
  word-break:break-word;
}

h1,h2,h3,h4,h5{
  font-family:var(--font-display);
  font-weight:800;
  letter-spacing:-.02em;
  line-height:1.08;
  color:var(--c-paper);
  text-wrap:balance;
}
h1{font-size:clamp(34px,5.2vw,60px)}
h2{font-size:clamp(26px,3.4vw,40px)}
h3{font-size:clamp(20px,2.2vw,26px)}
h4{font-size:clamp(17px,1.6vw,19px);letter-spacing:0}
p{text-wrap:pretty}

strong{color:var(--c-paper);font-weight:700}
small{font-size:13px;color:var(--c-steel)}

.sr-only{
  position:absolute;width:1px;height:1px;padding:0;margin:-1px;
  overflow:hidden;clip:rect(0 0 0 0);clip-path:inset(50%);white-space:nowrap;border:0;
}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.04em}
.dot{
  display:inline-block;width:6px;height:6px;border-radius:50%;
  background:var(--c-green);box-shadow:0 0 0 3px rgba(62,213,152,.16);flex:none;
}

/* ---------------- skip link ---------------- */
.skip-link{
  position:fixed;top:10px;left:10px;z-index:300;
  transform:translateY(-180%);
  padding:10px 18px;
  background:var(--c-cyan);color:#071321;
  font-family:var(--font-display);font-weight:800;font-size:15px;letter-spacing:.04em;
  border-radius:1px;
  transition:transform .18s var(--ease);
}
.skip-link:focus{transform:none}

/* ---------------- layout primitives ---------------- */
.wrap{
  width:100%;
  max-width:var(--wrap);
  margin-inline:auto;
  padding-inline:var(--gut);
}

.section{padding-block:clamp(40px,6vw,84px)}
.section--tight{padding-block:clamp(24px,4vw,48px)}
.section__head{
  display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;
  gap:14px 24px;margin-bottom:clamp(20px,3vw,36px);
}

.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--font-mono);font-size:11.5px;font-weight:500;
  letter-spacing:.18em;text-transform:uppercase;color:var(--c-ice);
}
.eyebrow::before{content:"";width:18px;height:2px;background:var(--c-cyan);flex:none}

.grid{display:grid;gap:clamp(14px,2vw,24px);grid-template-columns:minmax(0,1fr)}
.grid--split{grid-template-columns:minmax(0,1fr)}
.grid--cols{grid-template-columns:repeat(auto-fit,minmax(220px,1fr))}
@media (min-width:960px){
  .grid--split{grid-template-columns:minmax(0,5fr) minmax(0,7fr)}
}

.layout-doc{display:grid;gap:clamp(24px,4vw,48px);grid-template-columns:minmax(0,1fr)}
@media (min-width:1024px){
  .layout-doc{grid-template-columns:220px minmax(0,1fr)}
  .layout-doc__aside{position:sticky;top:calc(var(--header-h) + 24px);align-self:start}
}

/* ---------------- buttons ---------------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  min-height:44px;padding:0 20px;
  font-family:var(--font-display);font-weight:800;font-size:15px;letter-spacing:.045em;
  border:1px solid transparent;border-radius:1px;
  cursor:pointer;text-align:center;
  transition:background-color .18s var(--ease),color .18s var(--ease),
             border-color .18s var(--ease),transform .18s var(--ease);
}
.btn--signal{background:var(--c-orange);color:#071321;border-color:var(--c-orange)}
.btn--signal:hover{background:#ff8756;border-color:#ff8756}
.btn--ghost{background:rgba(34,230,210,.06);color:var(--c-cyan);border-color:var(--line-signal)}
.btn--ghost:hover{background:rgba(34,230,210,.14);color:var(--c-paper);border-color:var(--c-cyan)}
.btn--quiet{background:transparent;color:var(--c-mist);border-color:var(--line)}
.btn--quiet:hover{color:var(--c-paper);border-color:var(--line-signal)}
.btn--block{width:100%}

/* ---------------- breadcrumbs ---------------- */
.crumbs{font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;color:var(--c-steel)}
.crumbs__list{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.crumbs__item{display:inline-flex;align-items:center;gap:8px}
.crumbs__link{color:var(--c-mist);border-bottom:1px solid transparent;transition:color .18s,border-color .18s}
.crumbs__link:hover{color:var(--c-cyan);border-bottom-color:currentColor}
.crumbs__sep{color:var(--c-steel)}
.crumbs__item[aria-current="page"]{color:var(--c-paper)}

/* ---------------- prose ---------------- */
.prose{max-width:72ch;font-size:16.5px;line-height:1.78;color:var(--c-mist)}
.prose > * + *{margin-top:1.05em}
.prose h2,.prose h3,.prose h4{color:var(--c-paper);margin-top:1.9em}
.prose h2{font-size:clamp(24px,2.6vw,32px)}
.prose ul,.prose ol{padding-left:1.25em;list-style:disc}
.prose ol{list-style:decimal}
.prose li + li{margin-top:.4em}
.prose a{color:var(--c-cyan);text-decoration:underline;text-underline-offset:3px}
.prose a:hover{color:var(--c-paper)}
.prose__lead{font-size:clamp(17px,1.6vw,20px);line-height:1.7;color:var(--c-paper)}
.prose hr{border:0;border-top:1px solid var(--line);margin-block:2em}

/* ---------------- surfaces ---------------- */
.panel{
  background:var(--c-night);
  border:1px solid var(--line);
  box-shadow:var(--shadow-1);
  padding:clamp(18px,2.6vw,32px);
}
.card{
  position:relative;
  display:flex;flex-direction:column;gap:10px;
  background:linear-gradient(180deg,rgba(13,36,55,.92),rgba(11,28,47,.92));
  border:1px solid var(--line);
  box-shadow:var(--shadow-1);
  padding:clamp(16px,2.2vw,26px);
  transition:border-color .2s var(--ease),transform .2s var(--ease),box-shadow .2s var(--ease);
}
.card:hover{border-color:var(--line-signal);transform:translateY(-2px);box-shadow:var(--shadow-2)}
.card__index{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.2em;
  text-transform:uppercase;color:var(--c-cyan);
}
.card__title{font-family:var(--font-display);font-weight:800;font-size:20px;line-height:1.2;color:var(--c-paper)}
.card__text{font-size:14.5px;line-height:1.7;color:var(--c-steel)}

/* ---------------- tags & stats ---------------- */
.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 9px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;text-transform:uppercase;
  color:var(--c-mist);
  background:rgba(126,215,255,.05);
  border:1px solid var(--line);
  border-radius:1px;
}
.tag--cyan{background:var(--c-cyan);border-color:var(--c-cyan);color:#071321}
.tag--orange{background:var(--c-orange);border-color:var(--c-orange);color:#071321}

.stat{border-left:1px solid var(--line-signal);padding-left:14px}
.stat__value{
  font-family:var(--font-mono);font-variant-numeric:tabular-nums;
  font-size:clamp(22px,3vw,34px);line-height:1.1;color:var(--c-paper);
}
.stat__label{
  margin-top:4px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;
  text-transform:uppercase;color:var(--c-steel);
}

/* ---------------- media containers ---------------- */
.media{
  position:relative;display:block;overflow:hidden;
  background:linear-gradient(140deg,#0B1C2F 0%,#071321 56%,#0d2537 100%);
  border:1px solid var(--line);
  border-radius:1px;
}
.media::before{
  content:"";position:absolute;inset:0;z-index:1;pointer-events:none;
  background-image:
    linear-gradient(rgba(99,115,134,.14) 1px,transparent 1px),
    linear-gradient(90deg,rgba(99,115,134,.14) 1px,transparent 1px);
  background-size:48px 48px;
  opacity:.55;
}
.media::after{
  content:"";position:absolute;top:0;right:0;z-index:2;width:24px;height:24px;
  border-top:1px solid var(--c-cyan);border-right:1px solid var(--c-cyan);
  opacity:.7;pointer-events:none;
}
.media--16x9{aspect-ratio:16/9}
.media--4x3{aspect-ratio:4/3}
.media--1x1{aspect-ratio:1/1}
.media__img{
  position:absolute;inset:0;z-index:2;
  width:100%;height:100%;object-fit:cover;
  filter:saturate(.92) contrast(1.06) brightness(.94);
}
.media__caption{
  position:absolute;left:0;right:0;bottom:0;z-index:3;
  padding:10px 12px;
  background:linear-gradient(0deg,rgba(7,19,33,.94),rgba(7,19,33,0));
  font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;color:var(--c-mist);
}

/* ---------------- table of contents ---------------- */
.toc{border-left:1px solid var(--line);padding-left:1px}
.toc__title{
  padding-left:16px;margin-bottom:10px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.2em;
  text-transform:uppercase;color:var(--c-steel);
}
.toc__list{display:flex;flex-direction:column}
.toc__item + .toc__item{margin-top:1px}
.toc__link{
  display:block;padding:7px 0 7px 16px;margin-left:-1px;
  font-size:14px;line-height:1.45;color:var(--c-steel);
  border-left:2px solid transparent;
  transition:color .18s var(--ease),border-color .18s var(--ease),background-color .18s var(--ease);
}
.toc__link:hover{color:var(--c-paper);background:rgba(126,215,255,.04)}
.toc__link.is-current{color:var(--c-cyan);border-left-color:var(--c-cyan)}

/* ============================================================
   HEADER
   ============================================================ */
.site-header{
  position:fixed;
  inset:0 0 auto 0;
  z-index:80;
  background:linear-gradient(180deg,rgba(7,19,33,.94) 0%,rgba(7,19,33,.62) 62%,rgba(7,19,33,0) 100%);
  border-bottom:1px solid transparent;
  transition:background-color .22s var(--ease),border-color .22s var(--ease),background .22s var(--ease);
}
.site-header[data-stuck="true"]{
  background:rgba(7,19,33,.98);
  border-bottom-color:var(--line);
  box-shadow:0 20px 40px -36px rgba(0,0,0,1);
}

.header-rail{border-bottom:1px solid rgba(99,115,134,.22)}
.header-rail__inner{
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  height:28px;
  font-family:var(--font-mono);font-size:10.5px;letter-spacing:.15em;
  text-transform:uppercase;color:var(--c-steel);
}
.rail-status{display:inline-flex;align-items:center;gap:8px;color:var(--c-mist)}
.rail-status__dot{
  width:6px;height:6px;border-radius:50%;flex:none;
  background:var(--c-green);box-shadow:0 0 0 3px rgba(62,213,152,.16);
}
.rail-coord{color:var(--c-steel);white-space:nowrap}

.header-bar__inner{
  display:flex;align-items:center;justify-content:space-between;gap:18px;
  min-height:60px;
}

.brand{display:inline-flex;flex-direction:column;gap:2px;text-decoration:none}
.brand__mark{
  font-family:var(--font-display);font-weight:900;
  font-size:clamp(18px,2.2vw,23px);line-height:1;letter-spacing:.06em;
  color:var(--c-paper);
}
.brand__mark::after{
  content:"";display:inline-block;width:6px;height:6px;margin-left:8px;
  background:var(--c-cyan);vertical-align:2px;
}
.brand__tag{
  font-family:var(--font-mono);font-size:10px;letter-spacing:.16em;
  text-transform:uppercase;color:var(--c-steel);
}
.brand:hover .brand__tag{color:var(--c-ice)}

.nav-toggle{
  display:inline-flex;align-items:center;gap:9px;
  padding:9px 12px 9px 10px;
  border:1px solid var(--line);
  background:rgba(11,28,47,.72);
  color:var(--c-mist);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;text-transform:uppercase;
  cursor:pointer;
  transition:color .18s var(--ease),border-color .18s var(--ease),background-color .18s var(--ease);
}
.nav-toggle:hover{color:var(--c-paper);border-color:var(--line-signal);background:rgba(34,230,210,.08)}
.nav-toggle__bars{display:inline-flex;flex-direction:column;justify-content:center;gap:4px;width:16px;height:12px}
.nav-toggle__bars span{display:block;height:1.5px;background:currentColor;border-radius:1px;transition:transform .2s var(--ease)}
.site-header[data-open="true"] .nav-toggle__bars span:first-child{transform:translateY(2.75px) rotate(45deg)}
.site-header[data-open="true"] .nav-toggle__bars span:last-child{transform:translateY(-2.75px) rotate(-45deg)}

.primary-nav{
  position:absolute;top:100%;left:0;right:0;z-index:6;
  display:none;flex-direction:column;
  padding:10px var(--gut) 22px;
  background:rgba(7,19,33,.99);
  border-top:1px solid var(--line);
  border-bottom:1px solid var(--line);
  box-shadow:0 32px 56px -34px rgba(0,0,0,1);
  max-height:calc(100dvh - var(--header-h));
  overflow-y:auto;
}
.site-header[data-open="true"] .primary-nav{
  display:flex;
  animation:nav-drop .18s var(--ease) both;
}
@keyframes nav-drop{
  from{opacity:0;transform:translateY(-8px)}
  to{opacity:1;transform:translateY(0)}
}

.primary-nav__list{display:flex;flex-direction:column}
.primary-nav__item{border-top:1px solid var(--line-soft)}
.primary-nav__item:first-child{border-top:0}
.primary-nav__link{
  position:relative;
  display:flex;align-items:center;
  padding:14px 2px;
  font-size:15px;font-weight:500;letter-spacing:.01em;
  color:var(--c-mist);
  transition:color .18s var(--ease);
}
.primary-nav__link::after{
  content:"";position:absolute;left:0;right:0;bottom:2px;height:1px;
  background:var(--c-cyan);
  transform:scaleX(0);transform-origin:left;
  transition:transform .2s var(--ease);
}
.primary-nav__link:hover{color:var(--c-paper)}
.primary-nav__link:hover::after{transform:scaleX(1)}
.primary-nav__link[aria-current="page"]{color:var(--c-paper);font-weight:700}
.primary-nav__link[aria-current="page"]::after{transform:scaleX(1);background:var(--c-orange)}
.primary-nav__cta{margin-top:16px;width:100%}

.scroll-progress{
  position:absolute;left:0;right:0;bottom:0;height:2px;
  background:rgba(34,230,210,.10);
  pointer-events:none;
}
.scroll-progress__bar{
  display:block;height:100%;width:100%;
  background:linear-gradient(90deg,var(--c-cyan),var(--c-orange));
  transform:scaleX(0);transform-origin:0 50%;
  transition:transform .1s linear;
}

@media (max-width:719px){
  .rail-coord{display:none}
  .brand__tag{font-size:9.5px;letter-spacing:.12em}
}
@media (max-width:959px){
  .header-rail__inner{height:24px}
  .header-bar__inner{min-height:52px}
}

@media (min-width:960px){
  .nav-toggle{display:none}
  .primary-nav{
    position:static;
    display:flex;flex-direction:row;align-items:center;
    gap:clamp(12px,1.8vw,26px);
    padding:0;background:none;border:0;box-shadow:none;
    max-height:none;overflow:visible;
  }
  .primary-nav__list{flex-direction:row;align-items:center;gap:clamp(10px,1.6vw,24px)}
  .primary-nav__item{border-top:0}
  .primary-nav__link{padding:6px 0;font-size:14px}
  .primary-nav__cta{
    margin-top:0;margin-left:6px;width:auto;
    min-height:38px;padding:0 16px;font-size:14px;
  }
}

/* ============================================================
   FOOTER
   ============================================================ */
.site-footer{
  position:relative;
  margin-top:clamp(56px,9vw,120px);
  background:var(--c-night);
  border-top:1px solid var(--line);
  overflow:hidden;
}
.site-footer::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:
    linear-gradient(rgba(99,115,134,.10) 1px,transparent 1px),
    linear-gradient(90deg,rgba(99,115,134,.10) 1px,transparent 1px);
  background-size:64px 64px;
  -webkit-mask-image:linear-gradient(180deg,rgba(0,0,0,.85),transparent 68%);
  mask-image:linear-gradient(180deg,rgba(0,0,0,.85),transparent 68%);
  opacity:.6;
}
.site-footer::after{
  content:"";position:absolute;left:0;right:0;top:0;height:1px;pointer-events:none;
  background:linear-gradient(90deg,transparent,var(--line-signal) 22%,rgba(255,107,44,.5) 78%,transparent);
}

.footer-grid{
  position:relative;
  display:grid;gap:clamp(26px,4vw,40px);
  grid-template-columns:minmax(0,1fr);
  padding-block:clamp(40px,6vw,72px) clamp(26px,4vw,42px);
}

.footer-lead__brand{
  font-family:var(--font-display);font-weight:900;
  font-size:clamp(24px,3.4vw,36px);line-height:1.05;letter-spacing:-.015em;
  color:var(--c-paper);
}
.footer-lead__sub{
  margin-top:8px;
  font-size:14px;letter-spacing:.02em;color:var(--c-mist);
}
.footer-lead__meta{
  display:inline-flex;align-items:center;gap:9px;
  margin-top:18px;padding-top:14px;
  border-top:1px solid var(--line-soft);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;
  text-transform:uppercase;color:var(--c-steel);
}

.footer-col__title{
  display:flex;align-items:center;gap:9px;
  margin-bottom:14px;
  font-family:var(--font-display);font-weight:800;font-size:15px;
  letter-spacing:.06em;color:var(--c-paper);
}
.footer-col__index{
  font-family:var(--font-mono);font-size:10.5px;font-weight:500;
  letter-spacing:.14em;color:var(--c-cyan);
}
.footer-list{display:flex;flex-direction:column;gap:2px}
.footer-list__link{
  display:inline-flex;align-items:center;gap:7px;
  padding:5px 0;
  font-size:14px;color:var(--c-mist);
  transition:color .18s var(--ease),transform .18s var(--ease);
}
.footer-list__link::before{
  content:"";width:5px;height:1px;flex:none;
  background:var(--c-steel);
  transition:width .18s var(--ease),background-color .18s var(--ease);
}
.footer-list__link:hover{color:var(--c-cyan)}
.footer-list__link:hover::before{width:12px;background:var(--c-cyan)}

.footer-contact{
  position:relative;
  display:grid;gap:20px 28px;
  grid-template-columns:minmax(0,1fr);
  padding-block:clamp(22px,3vw,34px);
  border-top:1px solid var(--line);
}
.footer-contact__label{
  margin-bottom:5px;
  font-family:var(--font-mono);font-size:10.5px;letter-spacing:.18em;
  text-transform:uppercase;color:var(--c-steel);
}
.footer-contact__value{
  display:inline-block;
  font-size:14.5px;line-height:1.65;color:var(--c-paper);
  transition:color .18s var(--ease);
}
a.footer-contact__value{border-bottom:1px solid transparent}
a.footer-contact__value:hover{color:var(--c-cyan);border-bottom-color:currentColor}
.footer-contact__note{
  grid-column:1 / -1;
  font-size:13px;line-height:1.7;color:var(--c-steel);
}

.footer-base{
  position:relative;
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:12px 24px;
  padding-block:16px 26px;
  border-top:1px solid var(--line);
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.06em;
  color:var(--c-steel);
}
.footer-base__legal{margin-right:auto}
.footer-base__icp{color:var(--c-mist)}
.footer-base__copy{color:var(--c-steel)}

.to-top{
  display:inline-flex;align-items:center;gap:8px;
  padding:8px 14px;
  border:1px solid var(--line);
  background:rgba(7,19,33,.5);
  color:var(--c-mist);
  font-family:var(--font-mono);font-size:10.5px;letter-spacing:.16em;text-transform:uppercase;
  cursor:pointer;
  transition:color .18s var(--ease),border-color .18s var(--ease),background-color .18s var(--ease);
}
.to-top:hover{color:var(--c-cyan);border-color:var(--line-signal);background:rgba(34,230,210,.08)}
.to-top__arrow{font-size:12px;line-height:1;color:var(--c-orange)}

@media (min-width:720px){
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-lead{grid-column:1 / -1}
  .footer-contact{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (min-width:1024px){
  .footer-grid{grid-template-columns:1.7fr repeat(3,minmax(0,1fr));gap:clamp(24px,3vw,48px)}
  .footer-lead{grid-column:auto}
  .footer-contact{grid-template-columns:repeat(3,minmax(0,1fr))}
}

/* ============================================================
   MOTION / ACCESSIBILITY
   ============================================================ */
@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-behavior:auto !important;
  }
  .card:hover{transform:none}
  .scroll-progress__bar{transition:none}
}