/* ============ 开元体育主站 · 共享样式 /assets/site.css ============ */
:root{
  --ink:#071A14;
  --carbon:#0E1311;
  --paper:#F3EBDD;
  --paper-ink:#17231F;
  --cyan:#21F3D2;
  --lava:#FF6B2C;
  --clay:#A6432A;
  --mist:#6F7F76;
  --score:#F2C14E;
  --glass:rgba(243,235,221,.12);
  --hair:rgba(243,235,221,.14);
  --header-h:76px;
  --shell:1220px;
  --gutter:clamp(18px,4.2vw,52px);
  --font-display:'Barlow Condensed','Noto Sans SC','Source Han Sans SC',sans-serif;
  --font-num:'IBM Plex Mono','Roboto Mono',ui-monospace,monospace;
  --font-body:'Noto Sans SC','Source Han Sans SC',system-ui,-apple-system,'Segoe UI',sans-serif;
  --font-label:'Noto Sans SC','Source Han Sans SC',system-ui,sans-serif;
  --radius-cut:2px 12px 2px 12px;
  --shadow-lift:0 22px 48px -28px rgba(0,0,0,.85);
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:calc(var(--header-h) + 18px)}
body{
  margin:0;
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.75;
  color:var(--paper);
  background:
    radial-gradient(920px 540px at 84% -10%,rgba(33,243,210,.10),transparent 70%),
    radial-gradient(760px 460px at 2% 8%,rgba(255,107,44,.09),transparent 72%),
    var(--ink);
  min-height:100vh;
  overflow-x:hidden;
}
@media (max-width:640px){body{font-size:16px}}
h1,h2,h3,h4{font-family:var(--font-display);font-weight:800;line-height:1.04;letter-spacing:.01em;margin:0 0 .5em}
h1{font-size:clamp(34px,6vw,74px)}
h2{font-size:clamp(28px,4.2vw,52px)}
h3{font-size:clamp(20px,2.4vw,28px)}
p{margin:0 0 1.1em}
img{max-width:100%;display:block}
ul,ol{margin:0 0 1.1em;padding-left:1.2em}
a{color:inherit;text-decoration:none}
button{font:inherit}
strong{font-weight:700;color:var(--score)}
::selection{background:var(--cyan);color:#06231d}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;border-radius:2px}
main{display:block}
#main-content{padding-top:var(--header-h)}
#main-content.main-flush{padding-top:0}

/* ---------- 通用容器与节奏 ---------- */
.shell{width:100%;max-width:var(--shell);margin-inline:auto;padding-inline:var(--gutter)}
.section{position:relative;padding-block:clamp(56px,8vw,118px)}
.section--paper{background:var(--paper);color:var(--paper-ink)}
.section--carbon{background:var(--carbon)}
.section--paper h1,.section--paper h2,.section--paper h3{color:var(--paper-ink)}
.section--paper .eyebrow{color:var(--clay)}
.section--paper .lede{color:#3c4b44}
.section--paper .card{background:rgba(23,35,31,.94);color:var(--paper)}
.section-head{display:grid;gap:14px;max-width:64ch;margin-bottom:clamp(26px,4vw,46px)}
.section-head h2{margin:0}
.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--font-num);font-size:11px;font-weight:600;
  letter-spacing:.24em;text-transform:uppercase;color:var(--cyan);
}
.eyebrow::before{content:"";width:26px;height:2px;background:currentColor;display:block}
.display-num{
  display:block;font-family:var(--font-num);font-variant-numeric:tabular-nums;
  font-size:clamp(64px,13vw,190px);line-height:.84;letter-spacing:-.03em;color:var(--score);
}
.lede{font-size:clamp(16px,1.5vw,19px);line-height:1.72;color:rgba(243,235,221,.82);max-width:62ch;margin:0 0 1.1em}
.measure{max-width:72ch}
.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(0,1.9fr) minmax(0,1fr);align-items:start}
@media (max-width:900px){
  .grid--3{grid-template-columns:repeat(2,minmax(0,1fr))}
  .grid--split{grid-template-columns:1fr}
}
@media (max-width:620px){
  .grid--2,.grid--3{grid-template-columns:1fr}
}
.slant-band{
  height:12px;border:0;margin:0;
  background:linear-gradient(90deg,var(--clay),var(--lava) 38%,var(--cyan) 72%,rgba(243,235,221,.12));
  transform:skewY(-1.4deg);transform-origin:left center;opacity:.9;
}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.5em;
  padding:11px 20px;border:1px solid transparent;border-radius:var(--radius-cut);
  font-family:var(--font-label);font-size:13px;font-weight:600;letter-spacing:.1em;
  text-decoration:none;cursor:pointer;
  transition:transform .22s ease,background-color .22s ease,border-color .22s ease,color .22s ease,box-shadow .22s ease;
}
.btn--sm{padding:8px 14px;font-size:12px}
.btn-signal{background:var(--lava);color:#120a05;box-shadow:0 10px 26px -16px var(--lava)}
.btn-signal:hover,.btn-signal:focus-visible{background:#ff844d;transform:translateY(-2px)}
.btn-ghost{border-color:rgba(243,235,221,.3);color:var(--paper);background:rgba(243,235,221,.04)}
.btn-ghost:hover,.btn-ghost:focus-visible{border-color:var(--cyan);color:var(--cyan)}
.btn-paper{background:var(--paper);color:var(--paper-ink);border-color:var(--paper)}
.btn-paper:hover,.btn-paper:focus-visible{background:#fff8ec;transform:translateY(-2px)}
.btn-line{border-color:rgba(243,235,221,.22);color:var(--paper)}
.btn-line:hover,.btn-line:focus-visible{border-color:var(--cyan);color:var(--cyan)}

/* ---------- 跳转链接 ---------- */
.skip-link{
  position:fixed;top:10px;left:14px;z-index:400;
  padding:10px 18px;border-radius:2px 10px 2px 10px;
  background:var(--cyan);color:#06231d;
  font-family:var(--font-label);font-size:13px;font-weight:600;letter-spacing:.08em;
  transform:translateY(-160%);transition:transform .2s ease;
}
.skip-link:focus-visible,.skip-link:focus{transform:translateY(0);outline-offset:3px}

/* ---------- 头部 ---------- */
.site-header{
  position:fixed;inset:0 0 auto 0;z-index:120;
  background:linear-gradient(180deg,rgba(7,26,20,.76),rgba(7,26,20,.18));
  -webkit-backdrop-filter:blur(14px) saturate(120%);
  backdrop-filter:blur(14px) saturate(120%);
  border-bottom:1px solid rgba(243,235,221,.10);
  transition:background-color .34s ease,border-color .34s ease,box-shadow .34s ease;
}
.site-header.is-stuck{
  background:var(--carbon);
  border-bottom-color:rgba(166,67,42,.6);
  box-shadow:0 20px 44px -34px #000;
}
.progress-track{position:absolute;left:0;right:0;bottom:-1px;height:2px;background:rgba(243,235,221,.1);overflow:hidden}
.progress-bar{
  display:block;height:100%;width:100%;
  background:linear-gradient(90deg,var(--cyan),var(--lava));
  transform:scaleX(0);transform-origin:0 50%;
  transition:transform .14s linear;
}
.header-inner{display:flex;align-items:center;gap:clamp(12px,2.2vw,30px);min-height:var(--header-h)}
.brand{display:inline-flex;align-items:center;gap:12px;flex:0 0 auto;color:var(--paper)}
.brand-mark{
  position:relative;width:40px;height:40px;flex:0 0 auto;
  display:grid;place-items:center;
  font-family:var(--font-num);font-size:16px;font-weight:600;color:#06231d;
  background:linear-gradient(140deg,var(--cyan),#0fb9a0);
  border-radius:3px 13px 3px 13px;
  box-shadow:0 0 0 1px rgba(33,243,210,.35);
}
.brand-mark::after{
  content:"";position:absolute;right:-3px;bottom:-3px;width:9px;height:9px;
  background:var(--lava);border-radius:50%;box-shadow:0 0 0 2px var(--ink);
}
.brand-text{display:grid;gap:2px;line-height:1.1}
.brand-name{font-family:var(--font-display);font-size:18px;font-weight:800;letter-spacing:.03em;color:var(--paper)}
.brand-sub{font-family:var(--font-num);font-size:9.5px;letter-spacing:.2em;text-transform:uppercase;color:var(--mist)}
.brand:hover .brand-mark{box-shadow:0 0 0 1px var(--cyan),0 0 22px -6px var(--cyan)}

/* ---------- 导航 ---------- */
.site-nav{margin-left:auto;display:flex;align-items:center;gap:6px}
.nav-list{display:flex;align-items:center;gap:2px;list-style:none;margin:0;padding:0}
.nav-item{display:block}
.nav-link{
  position:relative;display:inline-block;padding:10px 11px;
  font-family:var(--font-label);font-size:13px;font-weight:600;letter-spacing:.1em;
  color:rgba(243,235,221,.78);
  transition:color .22s ease;
}
.nav-link::after{
  content:"";position:absolute;left:11px;right:11px;bottom:4px;height:2px;
  background:var(--cyan);transform:scaleX(0);transform-origin:left;
  transition:transform .28s ease;
}
.nav-link:hover,.nav-link:focus-visible{color:var(--paper)}
.nav-link:hover::after,.nav-link:focus-visible::after{transform:scaleX(1)}
.nav-link[aria-current="page"]{color:var(--cyan)}
.nav-link[aria-current="page"]::after{transform:scaleX(1);background:var(--cyan)}
.nav-aside{display:none}
.nav-note{margin:0;font-family:var(--font-num);font-size:10.5px;letter-spacing:.16em;text-transform:uppercase;color:var(--mist)}
.header-actions{display:flex;align-items:center;gap:10px;flex:0 0 auto}

/* ---------- 移动菜单按钮 ---------- */
.nav-toggle{
  display:none;align-items:center;gap:10px;margin-left:auto;
  padding:9px 14px;border:1px solid rgba(243,235,221,.24);border-radius:var(--radius-cut);
  background:rgba(243,235,221,.08);color:var(--paper);cursor:pointer;
  font-family:var(--font-label);font-size:12px;font-weight:600;letter-spacing:.12em;
}
.nav-toggle-bars{display:grid;gap:4px}
.nav-toggle-bars span{display:block;width:18px;height:2px;background:var(--cyan);transition:transform .26s ease,opacity .2s ease}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(1){transform:translateY(6px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(3){transform:translateY(-6px) rotate(-45deg)}

/* ---------- 头部响应式 ---------- */
@media (max-width:1080px){
  .brand-sub{display:none}
  .nav-link{padding:10px 8px;font-size:12.5px}
  .nav-link::after{left:8px;right:8px}
}
@media (max-width:900px){
  :root{--header-h:62px}
  .header-actions{display:none}
  .nav-toggle{display:inline-flex}
  .brand-mark{width:34px;height:34px;font-size:14px}
  .brand-name{font-size:16px}
  .site-nav{
    position:fixed;left:0;right:0;bottom:0;top:auto;z-index:130;
    display:block;margin:0;padding:20px var(--gutter) calc(22px + env(safe-area-inset-bottom));
    background:var(--carbon);
    border-top:1px solid var(--clay);
    border-radius:18px 18px 0 0;
    box-shadow:0 -30px 60px -32px #000;
    max-height:82vh;overflow:auto;
    transform:translateY(112%);visibility:hidden;
    transition:transform .38s cubic-bezier(.22,.8,.24,1),visibility .38s;
  }
  .site-nav[data-open="true"]{transform:translateY(0);visibility:visible}
  .nav-list{display:grid;grid-template-columns:1fr 1fr;gap:8px}
  .nav-link{
    display:block;padding:14px 12px;font-size:14px;
    background:rgba(243,235,221,.05);
    border:1px solid rgba(243,235,221,.09);
    border-radius:var(--radius-cut);
  }
  .nav-link::after{left:12px;right:auto;width:22px;bottom:9px}
  .nav-aside{display:grid;gap:10px;margin-top:18px;padding-top:16px;border-top:1px dashed rgba(243,235,221,.18)}
  .nav-aside .btn{width:100%}
  body.nav-open{overflow:hidden}
}
@media (max-width:420px){
  .nav-list{grid-template-columns:1fr}
  .nav-toggle-text{display:none}
}

/* ---------- 页脚 ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(56px,8vw,110px);
  padding-top:6px;
  background:var(--ink);
  border-top:1px solid rgba(166,67,42,.5);
}
.site-footer::before{
  content:"";position:absolute;top:0;left:0;right:0;height:6px;
  background:linear-gradient(90deg,var(--cyan) 0 20%,var(--clay) 20% 54%,var(--lava) 54% 70%,rgba(243,235,221,.14) 70% 100%);
}
.footer-inner{width:100%}
.footer-grid{
  display:grid;grid-template-columns:1.5fr .9fr .9fr 1.3fr;
  gap:clamp(20px,3.4vw,48px);
  padding-block:clamp(42px,6vw,76px) clamp(28px,4vw,46px);
}
.footer-brand{display:grid;gap:12px;align-content:start;max-width:38ch}
.footer-brand-name{font-family:var(--font-display);font-size:26px;font-weight:800;letter-spacing:.02em;margin:0;color:var(--paper)}
.footer-brand-line{font-family:var(--font-num);font-size:10.5px;letter-spacing:.2em;text-transform:uppercase;color:var(--mist);margin:0}
.footer-seal{
  justify-self:start;display:inline-flex;align-items:center;
  padding:6px 13px;border:1px solid rgba(33,243,210,.4);border-radius:999px;
  font-family:var(--font-num);font-size:10.5px;letter-spacing:.16em;text-transform:uppercase;color:var(--cyan);
}
.footer-note{font-size:12.5px;line-height:1.7;color:var(--mist);margin:0;max-width:34ch}
.footer-col{display:grid;gap:12px;align-content:start}
.footer-col-title{
  margin:0;padding-left:11px;position:relative;
  font-family:var(--font-label);font-size:12px;font-weight:600;letter-spacing:.18em;text-transform:uppercase;color:rgba(243,235,221,.55);
}
.footer-col-title::before{content:"";position:absolute;left:0;top:.35em;width:3px;height:.9em;background:var(--clay)}
.footer-list{list-style:none;margin:0;padding:0;display:grid;gap:8px}
.footer-link{
  display:inline-block;font-size:14.5px;color:rgba(243,235,221,.82);
  transition:color .2s ease,transform .2s ease;
}
.footer-link:hover,.footer-link:focus-visible{color:var(--cyan);transform:translateX(3px)}
.footer-contact{display:grid;gap:0}
.contact-row{
  display:grid;grid-template-columns:58px minmax(0,1fr);gap:10px;
  padding-block:7px;border-bottom:1px dashed rgba(243,235,221,.1);
}
.contact-row:last-child{border-bottom:0}
.contact-label{font-family:var(--font-num);font-size:10.5px;letter-spacing:.14em;text-transform:uppercase;color:var(--mist);padding-top:3px}
.contact-value{font-size:13.5px;color:rgba(243,235,221,.88);overflow-wrap:anywhere}
.footer-legal{
  display:flex;flex-wrap:wrap;gap:14px 26px;align-items:center;justify-content:space-between;
  padding-block:22px 8px;border-top:1px solid rgba(243,235,221,.12);
}
.footer-meta{margin:0;font-family:var(--font-num);font-size:11.5px;letter-spacing:.06em;color:var(--mist)}
.footer-legal-links{display:flex;flex-wrap:wrap;align-items:center;gap:10px 18px}
.footer-legal-links .footer-link{font-size:13px}
.to-top{
  padding:7px 14px;border:1px solid rgba(243,235,221,.24);border-radius:var(--radius-cut);
  background:transparent;color:rgba(243,235,221,.8);cursor:pointer;
  font-family:var(--font-label);font-size:12px;font-weight:600;letter-spacing:.1em;
  transition:border-color .2s ease,color .2s ease,transform .2s ease;
}
.to-top:hover,.to-top:focus-visible{border-color:var(--lava);color:var(--lava);transform:translateY(-2px)}
@media (max-width:920px){
  .footer-grid{grid-template-columns:1fr 1fr}
  .footer-brand{grid-column:1 / -1}
}
@media (max-width:560px){
  .footer-grid{grid-template-columns:1fr;gap:26px}
  .footer-legal{flex-direction:column;align-items:flex-start}
}

/* ---------- 卡片与胶囊矩阵 ---------- */
.card{
  position:relative;
  background:var(--carbon);
  border:1px solid var(--hair);
  border-radius:2px 16px 2px 16px;
  padding:clamp(18px,2.6vw,30px);
  color:var(--paper);
  box-shadow:var(--shadow-lift);
  transition:transform .28s ease,border-color .28s ease,box-shadow .28s ease;
}
.card:hover{border-color:rgba(33,243,210,.45)}
.card--lift:hover{transform:translateY(-4px)}
.card h3{margin-bottom:.4em}
.card p:last-child{margin-bottom:0}
.pill-set{display:flex;flex-wrap:wrap;gap:10px}
.pill{
  appearance:none;cursor:pointer;
  padding:9px 16px;border-radius:999px;
  border:1px solid rgba(243,235,221,.22);
  background:var(--glass);
  -webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);
  color:var(--paper);
  font-family:var(--font-label);font-size:12px;font-weight:600;letter-spacing:.1em;
  transition:background-color .22s ease,color .22s ease,border-color .22s ease,transform .22s ease;
}
.pill:hover{border-color:var(--cyan);color:var(--cyan);transform:translateY(-1px)}
.pill.is-active,.pill[aria-pressed="true"]{background:var(--cyan);border-color:var(--cyan);color:#06231d}
@media (max-width:640px){
  .pill-set{flex-wrap:nowrap;overflow-x:auto;padding-bottom:6px;-webkit-overflow-scrolling:touch}
  .pill{flex:0 0 auto;white-space:nowrap}
}
.filter-set{display:grid;gap:clamp(16px,2.4vw,26px)}
.filter-items{list-style:none;margin:0;padding:0;display:grid;gap:clamp(12px,1.8vw,20px)}
.filter-item{min-width:0}
[data-filter-item][hidden]{display:none !important}

/* ---------- 图片容器基础 ---------- */
.img-frame{
  position:relative;overflow:hidden;
  border:1px solid var(--hair);
  border-radius:2px 18px 2px 18px;
  background:
    linear-gradient(150deg,rgba(33,243,210,.14),rgba(166,67,42,.24)),
    var(--carbon);
  aspect-ratio:16 / 9;
}
.img-frame img,.img-frame > img{width:100%;height:100%;object-fit:cover}
.img-frame::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:linear-gradient(rgba(243,235,221,.08) 1px,transparent 1px),linear-gradient(90deg,rgba(243,235,221,.08) 1px,transparent 1px);
  background-size:44px 44px;
  mask-image:linear-gradient(180deg,rgba(0,0,0,.55),transparent 78%);
  -webkit-mask-image:linear-gradient(180deg,rgba(0,0,0,.55),transparent 78%);
}
.img-frame--wide{aspect-ratio:21 / 9}
.img-frame--tall{aspect-ratio:3 / 4}
.img-frame--square{aspect-ratio:1 / 1}
.img-caption{
  margin:.6em 0 0;
  font-family:var(--font-num);font-size:11px;letter-spacing:.14em;text-transform:uppercase;
  color:var(--mist);
}

/* ---------- 面包屑 ---------- */
.breadcrumb{font-family:var(--font-label);font-size:12px;letter-spacing:.1em;margin-bottom:18px}
.breadcrumb ol{display:flex;flex-wrap:wrap;gap:8px;list-style:none;margin:0;padding:0;color:var(--mist)}
.breadcrumb li:not(:last-child)::after{content:"/";margin-left:8px;color:rgba(243,235,221,.28)}
.breadcrumb a{color:rgba(243,235,221,.8)}
.breadcrumb a:hover,.breadcrumb a:focus-visible{color:var(--cyan)}
.breadcrumb [aria-current="page"]{color:var(--score)}
.section--paper .breadcrumb a{color:#3c4b44}
.section--paper .breadcrumb [aria-current="page"]{color:var(--clay)}

/* ---------- 滚动显现 ---------- */
.has-js [data-reveal]{opacity:0;transform:translateY(18px);transition:opacity .6s ease,transform .6s ease}
.has-js [data-reveal].is-in{opacity:1;transform:none}

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