/* ==========================================================================
   B体育赛场 /assets/site.css
   共享外壳：框架式导航、编辑部页脚、基础版式与组件
   ========================================================================== */

/* ---------- 1. reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,h5,p,ul,ol,dl,dd,figure,blockquote{margin:0}
ul,ol{padding:0;list-style:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
img,svg,video{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
table{border-collapse:collapse;width:100%}

/* ---------- 2. tokens ---------- */
:root{
  --space:#061826;
  --teal:#0B313B;
  --paper:#F0FAFA;
  --cyan:#38E1E8;
  --lemon:#D8FF3E;
  --indigo:#3B3278;
  --wine:#7A2141;
  --ink:#071A26;
  --glass:#A8DDE3;
  --edge:rgba(168,221,227,.20);
  --edge-soft:rgba(168,221,227,.10);
  --text-dim:rgba(240,250,250,.62);
  --text-mute:rgba(240,250,250,.45);
  --rail:96px;
  --top:68px;
  --max:1280px;
  --ease:cubic-bezier(.22,.68,.18,1);
  --font-sans:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:ui-monospace,"SFMono-Regular","Menlo","Consolas","JetBrains Mono",monospace;
}

/* ---------- 3. base ---------- */
body{
  min-height:100vh;
  padding-top:var(--top);
  padding-left:var(--rail);
  background-color:var(--space);
  background-image:
    radial-gradient(1100px 620px at 88% -12%, rgba(56,225,232,.12), transparent 62%),
    radial-gradient(900px 560px at -8% 102%, rgba(59,50,120,.42), transparent 64%),
    linear-gradient(180deg, rgba(11,49,59,.28), transparent 42%);
  background-attachment:fixed;
  background-repeat:no-repeat;
  color:var(--paper);
  font-family:var(--font-sans);
  font-size:16px;
  font-weight:400;
  line-height:1.85;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
::selection{background:var(--lemon);color:var(--ink)}
h1,h2,h3,h4{font-weight:300;line-height:1.15;letter-spacing:-.02em}
p{max-width:36em}
:focus-visible{outline:2px solid var(--lemon);outline-offset:3px}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}

/* ---------- 4. 顶栏 / 框架外壳 ---------- */
.skip-link{
  position:fixed;top:-120px;left:14px;z-index:400;
  padding:12px 20px;
  background:var(--lemon);color:var(--ink);
  font-size:13px;font-weight:600;letter-spacing:.06em;
  border-radius:2px;
  transition:top .22s var(--ease);
}
.skip-link:focus{top:14px}

.site-frame{position:relative;z-index:140}

.frame-top{
  position:fixed;top:0;left:0;right:0;height:var(--top);z-index:200;
  display:flex;align-items:center;gap:clamp(10px,1.6vw,26px);
  padding:0 clamp(12px,2vw,26px);
  background:linear-gradient(180deg, rgba(6,24,38,.96), rgba(6,24,38,.80));
  -webkit-backdrop-filter:blur(16px) saturate(150%);
  backdrop-filter:blur(16px) saturate(150%);
  border-bottom:1px solid var(--edge);
  box-shadow:0 1px 0 rgba(56,225,232,.10), 0 18px 40px -28px rgba(0,0,0,.9);
}

.brand{display:flex;align-items:center;gap:12px;min-width:0}
.brand-mark{
  width:40px;height:40px;flex:none;
  display:grid;place-items:center;
  font-family:var(--font-mono);font-size:18px;font-weight:600;color:var(--ink);
  background:linear-gradient(135deg,var(--cyan),#12b0bc 82%);
  clip-path:polygon(0 0,100% 0,100% 70%,70% 100%,0 100%);
  transition:background .25s var(--ease),transform .25s var(--ease);
}
.brand:hover .brand-mark{background:linear-gradient(135deg,var(--lemon),#a8c72a 85%);transform:translateY(-1px)}
.brand-text{display:flex;flex-direction:column;line-height:1}
.brand-name{font-size:16px;font-weight:600;letter-spacing:.02em;white-space:nowrap}
.brand-slug{margin-top:6px;font-family:var(--font-mono);font-size:9.5px;letter-spacing:.30em;color:var(--cyan)}
.brand-tagline{
  margin:0;padding-left:18px;
  border-left:1px solid var(--edge);
  font-size:12px;letter-spacing:.20em;line-height:1.6;
  color:var(--text-mute);white-space:nowrap;
}

.frame-utility{display:flex;align-items:center;gap:clamp(12px,2vw,26px);margin-left:auto}
.util-item{
  display:flex;align-items:center;gap:8px;
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.06em;
  color:var(--text-dim);white-space:nowrap;
}
.util-dot{width:6px;height:6px;flex:none;border-radius:50%;background:var(--lemon);box-shadow:0 0 0 3px rgba(216,255,62,.16)}
.util-link{color:rgba(240,250,250,.86);border-bottom:1px solid rgba(56,225,232,.35);padding-bottom:1px;transition:color .2s,border-color .2s}
.util-link:hover,.util-link:focus-visible{color:var(--cyan);border-color:var(--cyan)}

.nav-toggle{
  display:none;align-items:center;gap:10px;margin-left:auto;
  padding:9px 13px;
  border:1px solid var(--edge);border-radius:2px;
  color:var(--paper);
  font-size:12px;letter-spacing:.18em;
  transition:border-color .2s,background .2s;
}
.nav-toggle:hover,.nav-toggle[aria-expanded="true"]{border-color:rgba(56,225,232,.6);background:rgba(56,225,232,.10)}
.nav-toggle-bars{display:grid;gap:4px;width:17px}
.nav-toggle-bar{display:block;height:1.5px;width:100%;background:var(--cyan);transition:transform .28s var(--ease),opacity .22s linear}
.site-frame[data-open] .nav-toggle-bar:nth-child(1){transform:translateY(5.5px) rotate(45deg)}
.site-frame[data-open] .nav-toggle-bar:nth-child(2){opacity:0}
.site-frame[data-open] .nav-toggle-bar:nth-child(3){transform:translateY(-5.5px) rotate(-45deg)}

/* 左侧框架导航（桌面） */
.frame-nav{
  position:fixed;top:var(--top);left:0;bottom:0;width:var(--rail);z-index:190;
  display:flex;flex-direction:column;justify-content:space-between;
  padding:18px 0 16px;
  background:linear-gradient(180deg, rgba(11,49,59,.94) 0%, rgba(6,24,38,.97) 62%);
  -webkit-backdrop-filter:blur(12px);
  backdrop-filter:blur(12px);
  border-right:1px solid var(--edge);
  overflow-y:auto;
  overscroll-behavior:contain;
}
.nav-list{display:flex;flex-direction:column;align-items:center;gap:0}
.nav-item{width:100%}
.nav-link{
  position:relative;
  display:flex;flex-direction:column;align-items:center;gap:8px;
  padding:11px 4px;
  color:rgba(240,250,250,.68);
  transition:color .22s var(--ease),background .22s var(--ease);
}
.nav-link:hover,.nav-link:focus-visible{color:var(--paper);background:rgba(56,225,232,.08)}
.nav-index{font-family:var(--font-mono);font-size:9.5px;letter-spacing:.14em;color:rgba(56,225,232,.65);transition:color .22s}
.nav-label{writing-mode:vertical-rl;font-size:13px;font-weight:400;letter-spacing:.22em;line-height:1.2}
.nav-link[aria-current="page"]{color:var(--paper)}
.nav-link[aria-current="page"] .nav-index{color:var(--lemon)}
.nav-link[aria-current="page"]::before{
  content:"";position:absolute;left:0;top:50%;transform:translateY(-50%);
  width:3px;height:26px;
  background:var(--lemon);
  box-shadow:0 0 12px rgba(216,255,62,.62);
}
.nav-foot{display:flex;flex-direction:column;align-items:center;gap:14px;padding-top:14px}
.nav-cta{
  display:inline-block;
  writing-mode:vertical-rl;
  padding:13px 8px;
  background:var(--lemon);color:var(--ink);
  font-size:12px;letter-spacing:.20em;
  border-radius:1px;
  transition:background .22s var(--ease),color .22s var(--ease);
}
.nav-cta:hover,.nav-cta:focus-visible{background:var(--cyan);color:var(--ink)}
.nav-mark{writing-mode:vertical-rl;font-family:var(--font-mono);font-size:9px;letter-spacing:.32em;color:rgba(168,221,227,.38)}

/* 滚动进度 */
.frame-progress{
  position:fixed;top:var(--top);left:0;right:0;height:2px;z-index:198;
  background:rgba(56,225,232,.10);pointer-events:none;
}
.frame-progress-bar{
  display:block;height:100%;width:100%;
  transform:scaleX(0);transform-origin:0 50%;
  background:linear-gradient(90deg,var(--cyan),var(--lemon));
  box-shadow:0 0 14px rgba(216,255,62,.55);
}

/* ---------- 5. 版式容器与通用组件 ---------- */
.shell{width:min(var(--max),100% - clamp(28px,5vw,80px));margin-inline:auto}
.section{padding-block:clamp(44px,6.5vw,96px)}
.section > .shell > p{color:var(--text-dim)}

.bento{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:clamp(12px,1.6vw,20px)}
.bento > *{min-width:0}

.eyebrow{
  display:flex;align-items:center;gap:10px;margin-bottom:14px;
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.24em;text-transform:uppercase;
  color:var(--cyan);
}
.eyebrow::before{content:"";width:26px;height:1px;flex:none;background:currentColor;opacity:.75}

.display{
  font-size:clamp(2.6rem,8vw,6.2rem);
  font-weight:300;line-height:.95;letter-spacing:-.03em;
  color:var(--paper);
}
.display--accent{color:var(--cyan)}

.num{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:-.01em}
.num--hot{color:var(--lemon);font-weight:600}

.panel{
  position:relative;
  padding:clamp(20px,2.6vw,34px);
  border-radius:2px;
  border:1px solid transparent;
}
.panel--glass{
  background:rgba(168,221,227,.09);
  border-color:rgba(168,221,227,.24);
  -webkit-backdrop-filter:blur(14px) saturate(140%);
  backdrop-filter:blur(14px) saturate(140%);
}
.panel--solid{background:var(--paper);color:var(--ink);border-color:rgba(7,26,38,.08)}
.panel--solid h1,.panel--solid h2,.panel--solid h3,.panel--solid h4{color:var(--ink)}
.panel--solid p{color:rgba(7,26,38,.78)}
.panel--solid .eyebrow{color:#0a6672}
.panel--solid .num--hot{color:#58720a}
.panel--teal{background:var(--teal);border-color:rgba(56,225,232,.20)}
.panel--indigo{background:var(--indigo);border-color:rgba(168,221,227,.22)}
.panel--wine{background:var(--wine);border-color:rgba(240,250,250,.16)}

.breadcrumb{
  display:flex;flex-wrap:wrap;align-items:center;gap:10px;
  margin-bottom:26px;
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.12em;
  color:var(--text-mute);
}
.breadcrumb a{color:rgba(240,250,250,.74);border-bottom:1px solid transparent;transition:color .2s,border-color .2s}
.breadcrumb a:hover,.breadcrumb a:focus-visible{color:var(--cyan);border-color:rgba(56,225,232,.6)}
.breadcrumb li{display:flex;align-items:center;gap:10px}
.breadcrumb li + li::before{content:"/";color:rgba(56,225,232,.45)}
.breadcrumb [aria-current="page"]{color:var(--paper)}

.btn{
  display:inline-flex;align-items:center;gap:10px;
  padding:13px 22px;
  border:1px solid transparent;border-radius:2px;
  font-size:14px;font-weight:400;letter-spacing:.08em;line-height:1.3;
  transition:background .22s var(--ease),color .22s var(--ease),border-color .22s var(--ease),transform .22s var(--ease);
}
.btn--primary{background:var(--cyan);color:var(--ink);font-weight:600}
.btn--primary:hover,.btn--primary:focus-visible{background:var(--lemon);transform:translateY(-1px)}
.btn--ghost{border-color:rgba(56,225,232,.45);background:rgba(56,225,232,.06);color:var(--paper)}
.btn--ghost:hover,.btn--ghost:focus-visible{border-color:var(--cyan);background:rgba(56,225,232,.16)}
.panel--solid .btn--ghost{border-color:rgba(7,26,38,.28);color:var(--ink);background:transparent}
.panel--solid .btn--ghost:hover{border-color:var(--ink);background:rgba(7,26,38,.06)}

/* 图片容器基础规则（页面阶段放入 <img>） */
.media-frame{
  position:relative;overflow:hidden;isolation:isolate;
  aspect-ratio:16 / 9;
  background:
    linear-gradient(148deg, rgba(11,49,59,.96), rgba(6,24,38,.98) 58%, rgba(59,50,120,.92));
  border:1px solid var(--edge-soft);
}
.media-frame img{width:100%;height:100%;object-fit:cover;filter:saturate(1.08) contrast(1.06)}
.media-frame::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:repeating-linear-gradient(0deg, rgba(56,225,232,.10) 0 1px, transparent 1px 4px);
  mix-blend-mode:screen;opacity:.45;
}
.media-frame--wide{aspect-ratio:21 / 9}
.media-frame--tall{aspect-ratio:3 / 4}
.media-frame--diagonal{clip-path:polygon(0 0,100% 0,100% 82%,82% 100%,0 100%)}

/* 数据表 */
.data-table{font-family:var(--font-mono);font-size:13px;font-variant-numeric:tabular-nums;letter-spacing:.01em}
.data-table caption{caption-side:bottom;padding-top:10px;text-align:left;font-size:11px;letter-spacing:.1em;color:var(--text-mute)}
.data-table th,.data-table td{padding:10px 12px;text-align:left;border-bottom:1px solid rgba(168,221,227,.16)}
.data-table th{font-size:10.5px;font-weight:400;letter-spacing:.16em;text-transform:uppercase;color:rgba(56,225,232,.85)}
.data-table tbody tr:hover{background:rgba(56,225,232,.06)}
.data-table strong{font-weight:600}
.data-table .num--hot{font-size:1.15em}
.panel--solid .data-table th{color:#0a6672}
.panel--solid .data-table th,.panel--solid .data-table td{border-bottom-color:rgba(7,26,38,.14)}

/* 章节目录 */
.chapter-index{display:flex;flex-direction:column;gap:2px}
.chapter-link{
  display:flex;align-items:baseline;gap:10px;
  padding:9px 12px 9px 14px;
  border-left:2px solid rgba(168,221,227,.16);
  font-size:13px;line-height:1.55;color:var(--text-dim);
  transition:color .2s,border-color .2s,background .2s;
}
.chapter-link:hover,.chapter-link:focus-visible{color:var(--paper);background:rgba(56,225,232,.07)}
.chapter-num{font-family:var(--font-mono);font-size:10.5px;letter-spacing:.1em;color:rgba(56,225,232,.7)}
.chapter-link.is-current{color:var(--paper);border-left-color:var(--lemon);background:rgba(56,225,232,.10)}
.chapter-link.is-current .chapter-num{color:var(--lemon)}

/* ---------- 6. 页脚 ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(56px,8vw,132px);
  padding-top:clamp(44px,6vw,84px);
  background:linear-gradient(180deg,#04121C 0%,#061826 38%,#0B313B 100%);
  border-top:1px solid rgba(56,225,232,.28);
  overflow:hidden;
}
.site-footer::before{
  content:"";position:absolute;top:0;left:0;right:0;height:2px;
  background:linear-gradient(90deg,transparent,var(--cyan) 22%,var(--lemon) 62%,transparent);
  opacity:.55;
}
.footer-inner{
  position:relative;z-index:2;
  display:grid;grid-template-columns:minmax(0,1.05fr) minmax(0,1.9fr);
  gap:clamp(28px,4.5vw,72px);
  padding-bottom:clamp(38px,5vw,64px);
}
.footer-brand{display:flex;flex-direction:column;gap:18px}
.footer-name{font-size:clamp(19px,2.2vw,24px);font-weight:600;letter-spacing:.01em;line-height:1.3}
.footer-slug{font-family:var(--font-mono);font-size:11px;letter-spacing:.22em;color:var(--cyan);font-weight:400}
.footer-summary{max-width:30em;font-size:14px;line-height:1.85;color:var(--text-dim)}
.footer-contact-list{
  display:flex;flex-direction:column;gap:12px;
  padding:18px 20px;
  background:rgba(168,221,227,.08);
  border:1px solid rgba(168,221,227,.20);
  -webkit-backdrop-filter:blur(12px);
  backdrop-filter:blur(12px);
}
.footer-contact-list li{display:flex;flex-direction:column;gap:3px;min-width:0}
.contact-key{font-family:var(--font-mono);font-size:10px;letter-spacing:.20em;color:rgba(56,225,232,.9)}
.contact-val{font-size:13px;line-height:1.6;color:rgba(240,250,250,.82);word-break:break-word}
.footer-note{max-width:32em;font-size:12px;line-height:1.8;color:var(--text-mute)}

.footer-nav{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:clamp(18px,3vw,40px)}
.footer-col{border-top:1px solid rgba(168,221,227,.18);padding-top:16px}
.footer-col-title{
  margin-bottom:14px;
  font-family:var(--font-mono);font-size:10.5px;font-weight:400;letter-spacing:.20em;
  color:var(--cyan);
}
.footer-links{display:flex;flex-direction:column;gap:9px}
.footer-links a{
  font-size:13.5px;color:rgba(240,250,250,.78);
  border-bottom:1px solid transparent;padding-bottom:2px;
  transition:color .2s,border-color .2s;
}
.footer-links a:hover,.footer-links a:focus-visible{color:var(--paper);border-color:var(--lemon)}

.footer-base{position:relative;z-index:2;border-top:1px solid rgba(168,221,227,.14)}
.footer-base-inner{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:10px 26px;
  padding-block:18px;
}
.footer-legal,.footer-icp{
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.10em;
  color:var(--text-mute);
}
.footer-icp{color:rgba(168,221,227,.6)}

.to-top{
  position:fixed;right:clamp(14px,2vw,28px);bottom:clamp(14px,2vw,28px);z-index:150;
  display:inline-flex;align-items:center;gap:9px;
  padding:11px 16px;
  background:rgba(6,24,38,.9);
  border:1px solid rgba(56,225,232,.42);
  border-radius:2px;
  color:var(--paper);
  font-size:12px;letter-spacing:.14em;
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
  opacity:0;transform:translateY(10px);pointer-events:none;
  transition:opacity .28s var(--ease),transform .28s var(--ease),border-color .2s,background .2s;
}
.to-top.is-visible{opacity:1;transform:none;pointer-events:auto}
.to-top:hover,.to-top:focus-visible{border-color:var(--lemon);background:rgba(56,225,232,.16)}
.to-top-arrow{color:var(--lemon);font-family:var(--font-mono);font-size:14px;line-height:1}

.footer-wordmark{
  position:absolute;right:-.03em;bottom:-.16em;z-index:1;
  margin:0;max-width:none;
  font-family:var(--font-mono);font-size:clamp(4rem,15vw,12rem);font-weight:600;
  line-height:.8;letter-spacing:-.04em;
  color:rgba(168,221,227,.07);
  pointer-events:none;user-select:none;
}

/* ---------- 7. 响应式 ---------- */
@media (max-width:1180px){
  :root{--rail:84px;--top:62px}
  .brand-tagline{display:none}
  .brand-mark{width:36px;height:36px;font-size:16px}
  .nav-label{font-size:12px;letter-spacing:.18em}
}
@media (max-width:1060px){
  .frame-utility .util-item:first-child{display:none}
}
@media (max-width:900px){
  :root{--rail:0px;--top:60px}
  body{padding-left:0;background-attachment:scroll}
  .frame-top{padding-inline:14px;gap:12px}
  .frame-utility{display:none}
  .nav-toggle{display:inline-flex}
  .frame-nav{
    top:var(--top);left:0;right:0;bottom:auto;width:auto;
    max-height:calc(100vh - var(--top));
    max-height:calc(100dvh - var(--top));
    padding:8px 16px 24px;
    border-right:0;border-bottom:1px solid var(--edge);
    box-shadow:0 30px 60px -30px rgba(0,0,0,.95);
    overflow-y:auto;
    opacity:0;visibility:hidden;pointer-events:none;transform:translateY(-10px);
    transition:opacity .26s var(--ease),transform .26s var(--ease),visibility .26s linear;
  }
  .site-frame[data-open] .frame-nav{opacity:1;visibility:visible;pointer-events:auto;transform:none}
  .nav-list{align-items:stretch}
  .nav-link{flex-direction:row;align-items:center;gap:14px;padding:14px 6px;border-bottom:1px solid rgba(168,221,227,.10)}
  .nav-label{writing-mode:horizontal-tb;font-size:15px;letter-spacing:.08em}
  .nav-link[aria-current="page"]::before{top:auto;left:6px;bottom:7px;width:26px;height:2px;transform:none}
  .nav-foot{flex-direction:row;align-items:center;justify-content:space-between;padding:18px 6px 0;gap:12px}
  .nav-cta{writing-mode:horizontal-tb;padding:11px 18px;font-size:13px;letter-spacing:.14em}
  .nav-mark{writing-mode:horizontal-tb}
  .footer-inner{grid-template-columns:1fr;gap:34px}
  .footer-wordmark{font-size:clamp(3.4rem,18vw,7rem)}
  .to-top{padding:10px 13px;font-size:11px}
}
@media (max-width:640px){
  body{font-size:15.5px;line-height:1.8}
  .shell{width:calc(100% - 32px)}
  .brand-name{font-size:15px}
  .brand-slug{letter-spacing:.24em}
  .footer-nav{grid-template-columns:repeat(2,minmax(0,1fr));gap:22px 18px}
  .footer-base-inner{flex-direction:column;align-items:flex-start;gap:8px}
  .to-top-label{display:none}
  .to-top{padding:12px;border-radius:50%}
}

/* ---------- 8. 可访问性与动效偏好 ---------- */
@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;
  }
  .to-top{transform:none}
  .brand:hover .brand-mark{transform:none}
  .btn:hover{transform:none}
}