/* ============================================================
   天博体育主站 · 共享样式 /assets/site.css
   tokens → reset → 排版 → 通用组件 → 头部 → 页脚 → 响应式
   ============================================================ */

:root{
  --ink-900:#06131e;
  --ink-800:#0c2233;
  --ink-700:#17394d;
  --ice:#eefaff;
  --mist:#9cc4d2;
  --aurora:#2ff5c8;
  --teal:#0e8f7a;
  --signal:#ff7a33;
  --paper:#f3ead8;
  --lime:#c6ff4a;

  --line:rgba(156,196,210,.20);
  --line-strong:rgba(156,196,210,.42);
  --shadow-panel:0 24px 60px -40px rgba(0,0,0,.95);

  --font-display:"Barlow Condensed","Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
  --font-heading:"Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
  --font-body:"Noto Sans SC","PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
  --font-mono:"IBM Plex Mono","SFMono-Regular",Consolas,"Liberation Mono",monospace;

  --shell:1200px;
  --gutter:20px;
  --radius-lg:22px;
  --radius-md:14px;
  --radius-sm:10px;
  --ease:cubic-bezier(.22,.8,.3,1);
}

/* ---------- reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  background-color:var(--ink-900);
  background-image:
    linear-gradient(rgba(156,196,210,.055) 1px,transparent 1px),
    linear-gradient(90deg,rgba(156,196,210,.055) 1px,transparent 1px),
    radial-gradient(1200px 620px at 78% -10%,rgba(47,245,200,.10),transparent 70%),
    radial-gradient(900px 520px at 4% 2%,rgba(255,122,51,.07),transparent 70%);
  background-size:64px 64px,64px 64px,100% 100%,100% 100%;
  background-attachment:fixed,fixed,fixed,fixed;
  color:var(--ice);
  font-family:var(--font-body);
  font-size:16px;
  font-weight:400;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4,h5,h6,p,figure,blockquote,dl,dd{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
a{color:var(--aurora);text-decoration:none;transition:color .18s var(--ease)}
a:hover{color:var(--lime);text-decoration:underline;text-underline-offset:3px}
img,svg{display:block;max-width:100%;height:auto}
button{font:inherit;color:inherit}
:focus-visible{outline:2px solid var(--aurora);outline-offset:3px;border-radius:6px}
::selection{background:var(--aurora);color:var(--ink-900)}

/* ---------- 排版 ---------- */
h1,h2,h3,h4{font-family:var(--font-heading);font-weight:800;line-height:1.25;letter-spacing:.01em}
h1{font-size:clamp(28px,5vw,44px)}
h2{font-size:clamp(22px,3.4vw,30px)}
h3{font-size:clamp(18px,2.4vw,21px)}

/* ---------- 布局 ---------- */
.container{width:100%;max-width:var(--shell);margin-inline:auto;padding-inline:var(--gutter)}
.grid{display:grid;gap:18px}
.grid--editorial{grid-template-columns:repeat(12,minmax(0,1fr))}
.divider{height:1px;border:0;margin:28px 0;background:linear-gradient(90deg,var(--line-strong),transparent)}

/* ---------- 通用文本件 ---------- */
.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.26em;
  text-transform:uppercase;color:var(--aurora);
}
.eyebrow::before{content:"";width:26px;height:1px;background:currentColor;flex:none}

.section-head{
  display:flex;align-items:flex-end;justify-content:space-between;gap:16px;flex-wrap:wrap;
  padding-bottom:14px;border-bottom:1px solid var(--line-strong);margin-bottom:24px;
}
.section-head__title{font-family:var(--font-heading);font-size:clamp(22px,3.4vw,30px);font-weight:800;line-height:1.25}
.section-head__note{font-family:var(--font-mono);font-size:12px;letter-spacing:.14em;color:var(--mist)}

.prose{max-width:70ch;font-size:clamp(16px,1.6vw,17px);line-height:1.8;color:#d9eef6}
.prose p + p{margin-top:1em}
.prose h2,.prose h3{margin-top:1.6em;margin-bottom:.6em;color:var(--ice)}
.prose ul{list-style:disc;padding-left:1.25em;margin-top:.8em}
.prose li + li{margin-top:.4em}
.prose a{text-decoration:underline;text-underline-offset:3px}

/* ---------- 面包屑 ---------- */
.breadcrumb{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  padding-block:14px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.1em;color:var(--mist);
}
.breadcrumb a{color:var(--mist)}
.breadcrumb a:hover{color:var(--aurora)}
.breadcrumb__sep{color:var(--ink-700)}
.breadcrumb [aria-current="page"]{color:var(--ice)}

/* ---------- 面板与纸卡 ---------- */
.panel{
  position:relative;
  background:linear-gradient(160deg,var(--ink-800),rgba(6,19,30,.92));
  border:1px solid var(--line);
  border-radius:var(--radius-lg);
  padding:22px;
  box-shadow:var(--shadow-panel);
}
.panel--signal{border-left:3px solid var(--signal)}
.paper-card{
  background:var(--paper);
  color:var(--ink-900);
  border:1px solid rgba(6,19,30,.14);
  border-radius:var(--radius-md);
  padding:22px;
  box-shadow:0 20px 44px -34px #000;
}
.paper-card a{color:#0b5c50;text-decoration:underline;text-underline-offset:3px}
.paper-card a:hover{color:var(--ink-900)}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  min-height:44px;padding:10px 18px;
  border:1px solid transparent;border-radius:999px;
  font-family:var(--font-heading);font-size:15px;font-weight:700;letter-spacing:.02em;
  text-decoration:none;cursor:pointer;
  transition:background .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease),transform .18s var(--ease);
}
.btn:hover{text-decoration:none}
.btn--signal{
  background:var(--signal);color:var(--ink-900);
  box-shadow:0 0 0 1px rgba(255,122,51,.35),0 12px 26px -16px rgba(255,122,51,.95);
}
.btn--signal:hover{background:#ff9054;color:var(--ink-900);transform:translateY(-1px)}
.btn--ghost{background:transparent;border-color:var(--line-strong);color:var(--ice)}
.btn--ghost:hover{border-color:var(--aurora);color:var(--aurora);background:rgba(47,245,200,.08)}

/* ---------- 状态胶囊 ---------- */
.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 10px;border-radius:999px;
  border:1px solid var(--line-strong);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.12em;text-transform:uppercase;
  color:var(--mist);white-space:nowrap;
}
.tag--live{background:var(--aurora);color:var(--ink-900);border-color:transparent}
.tag--signal{background:var(--signal);color:var(--ink-900);border-color:transparent}

/* ---------- 图片容器基础规则 ---------- */
.media-frame{
  position:relative;overflow:hidden;isolation:isolate;
  border:1px solid var(--line-strong);border-radius:var(--radius-lg);
  background:radial-gradient(120% 100% at 18% 0%,var(--ink-700),var(--ink-900));
}
.media-frame__ratio{position:relative;display:block;width:100%;aspect-ratio:16 / 10}
.media-frame__ratio[data-ratio="4x3"]{aspect-ratio:4 / 3}
.media-frame__ratio[data-ratio="1x1"]{aspect-ratio:1 / 1}
.media-frame__ratio[data-ratio="3x4"]{aspect-ratio:3 / 4}
.media-frame__ratio img,.media-frame__ratio svg{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.media-frame::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:repeating-linear-gradient(115deg,rgba(47,245,200,.07) 0 1px,transparent 1px 9px);
  mix-blend-mode:screen;
}
.media-frame__caption{
  position:relative;z-index:1;
  padding:12px 16px;border-top:1px solid var(--line);
  background:rgba(6,19,30,.62);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.12em;color:var(--mist);
}

/* ---------- 滚动显现 ---------- */
.js-reveal [data-reveal]{
  opacity:0;transform:translateY(16px);
  transition:opacity .5s var(--ease),transform .5s var(--ease);
  will-change:opacity,transform;
}
.js-reveal [data-reveal].is-visible{opacity:1;transform:none}

/* ============================================================
   头部
   ============================================================ */
.site-header{position:relative;z-index:50;background:var(--ink-900)}

.skip-link{
  position:absolute;left:16px;top:-96px;z-index:120;
  display:inline-flex;align-items:center;min-height:44px;
  padding:12px 18px;border-radius:0 0 12px 12px;
  background:var(--aurora);color:var(--ink-900);
  font-family:var(--font-heading);font-weight:700;font-size:15px;
  transition:top .18s var(--ease);
}
.skip-link:focus{top:0;color:var(--ink-900);text-decoration:none}

.site-header__rail{background:var(--ink-800);border-bottom:1px solid var(--line)}
.rail__inner{
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  min-height:38px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.14em;color:var(--mist);
}
.rail-mark{display:inline-flex;align-items:center;gap:8px;color:var(--ice)}
.rail-dot{
  width:6px;height:6px;border-radius:50%;flex:none;
  background:var(--lime);box-shadow:0 0 10px rgba(198,255,74,.9);
}
.rail-time{letter-spacing:.12em}

.masthead{
  border-bottom:1px solid var(--line-strong);
  background:linear-gradient(180deg,rgba(23,57,77,.55),rgba(6,19,30,0));
}
.masthead__inner{
  display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:18px;
  max-width:var(--shell);margin-inline:auto;padding:22px var(--gutter) 18px;
}
.masthead__side{
  display:flex;flex-direction:column;gap:4px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.2em;
  text-transform:uppercase;color:var(--mist);
}
.masthead__side--right{align-items:flex-end}
.masthead__tick{font-size:12px;letter-spacing:.16em;color:var(--aurora)}
.masthead__note{font-size:10px;letter-spacing:.18em;color:var(--mist)}
.masthead__brand{display:grid;justify-items:center;gap:6px;text-align:center}
.masthead__descriptor{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.42em;
  text-transform:uppercase;color:var(--mist);padding-left:.42em;
}
.masthead__brand-cn{
  font-family:var(--font-display);
  font-size:clamp(34px,6.4vw,58px);line-height:1;font-weight:900;
  letter-spacing:.12em;padding-left:.12em;color:var(--ice);
  text-shadow:0 0 32px rgba(47,245,200,.25);
}
.masthead__brand-cn:hover{color:var(--aurora);text-decoration:none}
.masthead__brand::after{
  content:"";width:72px;height:2px;margin-top:2px;
  background:linear-gradient(90deg,transparent,var(--aurora),transparent);
}
.masthead__brand-en{
  font-family:var(--font-mono);font-size:10px;letter-spacing:.3em;
  text-transform:uppercase;color:var(--teal);
}
.masthead__cta{letter-spacing:.06em}

.navbar{
  position:sticky;top:0;z-index:60;
  background:rgba(6,19,30,.94);
  -webkit-backdrop-filter:blur(12px);
  backdrop-filter:blur(12px);
  border-bottom:1px solid var(--line-strong);
}
.navbar__inner{display:block;padding-block:10px 12px}
.scroll-progress{
  position:absolute;left:0;right:0;bottom:-1px;height:2px;
  transform:scaleX(0);transform-origin:0 50%;
  background:linear-gradient(90deg,var(--teal),var(--aurora) 55%,var(--lime));
  transition:transform .12s linear;
  will-change:transform;
}

.nav-toggle{
  display:inline-flex;align-items:center;gap:10px;
  min-height:44px;padding:8px 16px 8px 12px;
  border:1px solid var(--line-strong);border-radius:999px;
  background:rgba(12,34,51,.9);color:var(--ice);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.16em;
  cursor:pointer;
  transition:border-color .18s var(--ease),color .18s var(--ease),background .18s var(--ease);
}
.nav-toggle:hover{border-color:var(--aurora);color:var(--aurora)}
.nav-toggle[aria-expanded="true"]{background:var(--aurora);color:var(--ink-900);border-color:transparent}
.nav-toggle__bars{display:grid;gap:3px;width:18px;flex:none}
.nav-toggle__bars i{display:block;height:2px;border-radius:2px;background:currentColor}
.nav-toggle__bars i:nth-child(2){width:70%}
.nav-toggle__text{line-height:1}

.site-nav{display:none;width:100%}
.site-nav[data-open="true"]{display:block}
.nav-list{display:flex;flex-direction:column;gap:2px}
.nav-item{min-width:0}
.nav-link{
  display:flex;align-items:center;gap:10px;
  min-height:44px;padding:10px 12px;border-radius:var(--radius-sm);
  border-left:3px solid transparent;
  color:var(--ice);font-family:var(--font-heading);font-size:15px;font-weight:500;
  transition:background .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease);
}
.nav-link:hover{color:var(--aurora);background:rgba(47,245,200,.08);text-decoration:none}
.nav-link__index{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;
  color:var(--mist);flex:none;
}
.nav-link__label{white-space:nowrap}
.nav-link:hover .nav-link__index{color:var(--aurora)}
.nav-link[aria-current="page"]{
  color:var(--aurora);
  background:rgba(47,245,200,.10);
  border-left-color:var(--aurora);
}
.nav-link[aria-current="page"] .nav-link__index{color:var(--lime)}

/* 移动端刻度抽屉 */
@media (max-width:899px){
  .site-nav{margin-top:10px}
  .site-nav[data-open="true"]{
    display:block;
    padding:8px;
    background:var(--ink-800);
    border:1px solid var(--line-strong);
    border-radius:var(--radius-md);
    box-shadow:var(--shadow-panel);
  }
}

/* ============================================================
   页脚
   ============================================================ */
.site-footer{
  position:relative;
  background:var(--ink-800);
  border-top:1px solid var(--line-strong);
  color:var(--ice);
}
.site-footer::before{
  content:"";position:absolute;top:0;left:0;right:0;height:4px;
  background:
    repeating-linear-gradient(90deg,var(--aurora) 0 18px,transparent 18px 34px),
    linear-gradient(90deg,var(--teal),var(--ink-700));
}
.footer__top{
  display:grid;grid-template-columns:1.5fr 1fr 1.2fr;gap:32px;
  padding-block:56px 38px;
}
.footer__brand-line{
  font-family:var(--font-display);
  font-size:clamp(20px,2.6vw,26px);font-weight:800;line-height:1.3;
  letter-spacing:.06em;color:var(--ice);
}
.footer__brand-note{margin-top:12px;max-width:34ch;font-size:15px;line-height:1.7;color:var(--mist)}
.footer__brand-tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:18px}
.footer__nav-title{
  margin-bottom:16px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.26em;
  text-transform:uppercase;color:var(--aurora);
}
.footer__links{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px 18px}
.footer__link{
  display:inline-flex;align-items:center;min-height:32px;
  font-size:15px;color:var(--mist);
  transition:color .18s var(--ease);
}
.footer__link:hover{color:var(--aurora);text-decoration:none}
.footer__contact-list{display:grid;gap:10px;font-size:15px}
.footer__contact-row{display:grid;grid-template-columns:52px 1fr;gap:10px;align-items:start}
.footer__contact-key{
  padding-top:5px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;color:var(--mist);
}
.footer__contact-value{color:var(--ice);word-break:break-word}
.footer__note{margin-top:14px;max-width:40ch;font-size:13px;line-height:1.7;color:var(--mist)}
.footer__legal{border-top:1px solid var(--line);background:rgba(6,19,30,.75)}
.footer__legal-inner{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:10px 22px;
  padding-block:18px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:var(--mist);
}
.footer__icp{color:var(--ice)}
.footer__stamp{color:var(--teal)}

/* ============================================================
   响应式
   ============================================================ */
@media (min-width:900px){
  .navbar__inner{display:flex;align-items:center;justify-content:center;padding-block:6px}
  .nav-toggle{display:none}
  .site-nav{display:block}
  .site-nav[data-open="true"]{display:block}
  .nav-list{flex-direction:row;flex-wrap:wrap;justify-content:center;gap:2px}
  .nav-link{
    border-left:0;border-bottom:2px solid transparent;
    border-radius:10px 10px 0 0;padding:12px 14px;
  }
  .nav-link[aria-current="page"]{
    border-bottom-color:var(--aurora);
    border-left-color:transparent;
    background:linear-gradient(180deg,rgba(47,245,200,.14),transparent);
  }
}

@media (max-width:1023px){
  .footer__top{grid-template-columns:1fr 1fr;gap:28px;padding-block:44px 32px}
  .footer__brand{grid-column:1 / -1}
}

@media (max-width:899px){
  .grid--editorial{grid-template-columns:repeat(4,minmax(0,1fr));gap:14px}
}

@media (max-width:719px){
  .masthead__inner{
    grid-template-columns:1fr;justify-items:center;gap:14px;
    padding-block:20px 16px;
  }
  .masthead__side--left{display:none}
  .masthead__side--right{align-items:center;width:100%}
  .masthead__cta{width:100%;max-width:280px}
  .rail__inner{justify-content:center;text-align:center;flex-wrap:wrap;row-gap:2px;min-height:34px;font-size:11px}
  .rail-time{display:none}
}

@media (max-width:639px){
  :root{--gutter:16px}
  body{font-size:15px}
  .footer__top{grid-template-columns:1fr;gap:26px;padding-block:40px 28px}
  .footer__links{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer__legal-inner{flex-direction:column;align-items:flex-start;gap:6px}
  .section-head{align-items:flex-start}
}

/* ---------- 动效与可访问性 ---------- */
@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{transition:none}
  .js-reveal [data-reveal]{opacity:1 !important;transform:none !important}
  .btn--signal:hover{transform:none}
}