/* ==========================================================================
   OB体育入口 · 共享站点样式  /assets/site.css
   竞技场黑底 + 暖纸阅读层 + 荧光绿/电光紫信号色 · 刻度尺窗口结构
   ========================================================================== */

/* ---------- 1. 变量 ---------- */
:root{
  --arena:#0A0D12;
  --deep:#141A22;
  --paper:#F2EDE3;
  --ink:#1A1D22;
  --ink-soft:#4E545C;
  --neon:#C8FF3C;
  --neon-dim:#7FA320;
  --violet:#8B5CF6;
  --violet-deep:#4C1D95;
  --amber:#FFB020;
  --glass:rgba(255,255,255,.08);
  --glass-soft:rgba(255,255,255,.04);
  --rule:#2A313B;
  --rule-soft:rgba(242,237,227,.12);
  --header-h:76px;
  --wrap:1240px;
  --font-display:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-body:var(--font-display);
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,"Courier New",monospace;
  --ease:cubic-bezier(.22,.61,.36,1);
}

/* ---------- 2. Reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  padding-top:var(--header-h);
  background:var(--arena);
  color:var(--paper);
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.85;
  font-weight:400;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4,h5{margin:0;font-family:var(--font-display);font-weight:900;letter-spacing:-.02em;line-height:1.18}
p{margin:0 0 1em}
ul,ol{list-style:none;margin:0;padding:0}
a{color:inherit;text-decoration:none}
img,picture,svg{display:block;max-width:100%}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer}
hr{border:0}
::selection{background:var(--neon);color:#0A0D12}
:focus-visible{outline:2px solid var(--neon);outline-offset:3px;border-radius:2px}
#main-content{scroll-margin-top:calc(var(--header-h) + 16px)}

/* ---------- 3. 布局工具 ---------- */
.wrap{width:100%;max-width:var(--wrap);margin:0 auto;padding:0 24px}
.section{padding:72px 0}
.hairline{height:1px;background:var(--rule);border:0;margin:0}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.02em}
.grid-12{display:grid;grid-template-columns:repeat(12,1fr);gap:24px}
.span-4{grid-column:span 4}
.span-5{grid-column:span 5}
.span-7{grid-column:span 7}
.span-8{grid-column:span 8}

.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--font-mono);font-size:11px;font-weight:500;
  letter-spacing:.28em;text-transform:uppercase;color:var(--neon);
}
.eyebrow::before{content:"";width:22px;height:1px;background:var(--neon)}

.section-label{
  writing-mode:vertical-rl;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.32em;
  text-transform:uppercase;color:rgba(242,237,227,.45);
}

.tag{
  display:inline-flex;align-items:center;gap:6px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;
  padding:4px 10px;border:1px solid var(--rule);border-radius:999px;
  color:rgba(242,237,227,.72);
}
.tag--neon{color:var(--neon);border-color:var(--neon-dim)}
.tag--violet{color:#C4B5FD;border-color:var(--violet)}

/* ---------- 4. 跳转链接 ---------- */
.skip-link{
  position:fixed;top:-120px;left:16px;z-index:200;
  padding:10px 18px;border-radius:2px;
  background:var(--neon);color:#0A0D12;
  font-size:14px;font-weight:800;letter-spacing:.02em;
  transition:top .22s var(--ease);
}
.skip-link:focus{top:12px}

/* ---------- 5. 页头 ---------- */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:90;
  background:transparent;
  border-bottom:1px solid transparent;
  color:var(--paper);
  transition:background .35s var(--ease),border-color .35s var(--ease),backdrop-filter .35s var(--ease);
}
.site-header[data-scrolled="true"]{
  background:rgba(10,13,18,.78);
  -webkit-backdrop-filter:blur(12px) saturate(1.25);
  backdrop-filter:blur(12px) saturate(1.25);
  border-bottom-color:var(--rule);
}
.scale-rail{
  height:5px;
  background-image:repeating-linear-gradient(90deg,var(--rule) 0 1px,transparent 1px 24px);
  opacity:.85;
}
.site-header__inner{
  display:flex;align-items:center;gap:18px;
  height:calc(var(--header-h) - 7px);
}
.progress-bar{
  display:block;height:2px;width:100%;
  background:transparent;opacity:0;
  transition:opacity .3s var(--ease),background .3s var(--ease);
}
.site-header[data-scrolled="true"] .progress-bar{opacity:1;background:rgba(242,237,227,.08)}
.progress-bar__fill{
  display:block;height:100%;width:0;
  background:linear-gradient(90deg,var(--neon) 0%,var(--violet) 100%);
}

/* 品牌 */
.brand{display:flex;align-items:center;gap:10px;flex:0 0 auto}
.brand__glyph{
  display:grid;place-items:center;width:38px;height:38px;flex:0 0 auto;
  border:1px solid var(--neon-dim);border-radius:2px;
  background:linear-gradient(140deg,rgba(200,255,60,.16),rgba(139,92,246,.22));
  font-family:var(--font-mono);font-size:13px;font-weight:700;letter-spacing:.04em;
  color:var(--neon);
}
.brand__lines{display:flex;flex-direction:column;line-height:1.12}
.brand__title{font-size:16px;font-weight:900;letter-spacing:-.01em}
.brand__sub{
  font-family:var(--font-mono);font-size:10px;letter-spacing:.22em;
  color:rgba(242,237,227,.55);text-transform:uppercase;
}

/* 导航标签带 */
.nav-rail{flex:1 1 auto;min-width:0}
.nav-rail__list{
  display:flex;align-items:center;gap:2px;
  overflow-x:auto;scrollbar-width:none;
}
.nav-rail__list::-webkit-scrollbar{display:none}
.nav-link{
  position:relative;
  display:inline-flex;align-items:baseline;gap:6px;
  padding:8px 12px;border-radius:2px;
  font-size:14px;font-weight:500;white-space:nowrap;
  color:rgba(242,237,227,.72);
  transition:color .2s var(--ease),background .2s var(--ease);
}
.nav-link:hover{color:var(--paper);background:var(--glass)}
.nav-link__index{font-family:var(--font-mono);font-size:10px;letter-spacing:.08em;color:var(--neon-dim)}
.nav-link[aria-current="page"]{color:var(--neon)}
.nav-link[aria-current="page"]::after{
  content:"";position:absolute;left:12px;right:12px;bottom:2px;
  height:2px;background:var(--neon);
}
.nav-link.is-active{color:var(--neon)}
.nav-link.is-active .nav-link__index{color:var(--neon)}

/* 右侧功能 */
.header-actions{display:flex;align-items:center;gap:10px;flex:0 0 auto}
.search-entry{
  display:inline-flex;align-items:center;gap:8px;
  padding:7px 14px;border:1px dashed var(--rule);border-radius:999px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;
  color:rgba(242,237,227,.62);
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.search-entry::before{
  content:"";width:7px;height:7px;border-radius:50%;
  background:var(--violet);box-shadow:0 0 8px rgba(139,92,246,.9);
}
.search-entry:hover{color:var(--neon);border-color:var(--neon-dim);border-style:solid}
.status-chip{
  display:inline-flex;align-items:center;gap:7px;
  padding:6px 11px;border:1px solid var(--rule);border-radius:999px;
  background:var(--glass-soft);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;
  color:rgba(242,237,227,.62);
}
.status-chip__dot{
  width:6px;height:6px;border-radius:50%;
  background:var(--neon);box-shadow:0 0 8px var(--neon);
  animation:ob-pulse 2.6s ease-in-out infinite;
}
@keyframes ob-pulse{
  0%,100%{opacity:1;transform:scale(1)}
  50%{opacity:.45;transform:scale(.82)}
}

/* 按钮 */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:10px 18px;border:1px solid transparent;border-radius:2px;
  font-size:14px;font-weight:800;letter-spacing:.01em;white-space:nowrap;
  transition:transform .2s var(--ease),background .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease),box-shadow .2s var(--ease);
}
.btn--primary{background:var(--neon);color:#0A0D12}
.btn--primary:hover{transform:translateY(-1px);box-shadow:0 8px 24px rgba(200,255,60,.28)}
.btn--ghost{background:var(--glass);color:var(--paper);border-color:var(--rule)}
.btn--ghost:hover{color:var(--neon);border-color:var(--neon-dim)}

/* 移动菜单按钮 */
.nav-toggle{
  display:none;place-items:center;
  width:42px;height:42px;
  border:1px solid var(--rule);border-radius:2px;background:var(--glass);
}
.nav-toggle__bars{position:relative;display:block;width:20px;height:2px;background:var(--paper);transition:background .2s var(--ease)}
.nav-toggle__bars::before,
.nav-toggle__bars::after{
  content:"";position:absolute;left:0;width:20px;height:2px;background:var(--paper);
  transition:transform .25s var(--ease);
}
.nav-toggle__bars::before{top:-6px}
.nav-toggle__bars::after{top:6px}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars{background:transparent}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before{transform:translateY(6px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after{transform:translateY(-6px) rotate(-45deg)}

/* ---------- 6. 页脚 ---------- */
.site-footer{
  position:relative;
  background:var(--deep);
  border-top:1px solid var(--rule);
  color:var(--paper);
  overflow:hidden;
}
.site-footer::before{
  content:"";position:absolute;top:0;left:0;right:0;height:1px;
  background:linear-gradient(90deg,transparent,var(--neon-dim) 35%,var(--violet) 65%,transparent);
  opacity:.8;
}
.site-footer::after{
  content:"";position:absolute;right:-10%;bottom:-40%;width:60%;height:80%;
  background:radial-gradient(50% 50% at 50% 50%,rgba(139,92,246,.22),transparent 70%);
  pointer-events:none;
}
.footer-grid{
  position:relative;z-index:1;
  display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:32px;
  padding:60px 0 40px;
}
.footer-brand{display:flex;flex-direction:column;gap:16px;max-width:34em}
.footer-note{
  margin:0;font-size:14px;line-height:1.8;
  color:rgba(242,237,227,.62);
}
.footer-contact{display:flex;flex-direction:column;gap:10px;margin-top:4px}
.footer-contact__row{
  display:flex;flex-wrap:wrap;align-items:center;gap:10px;
  margin:0;font-size:13px;
}
.footer-contact__key{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;
  color:var(--neon-dim);min-width:64px;
}
.footer-contact__val{color:rgba(242,237,227,.9);font-size:13px;word-break:break-all}
.footer-contact__hint{
  margin:0;font-size:12px;color:rgba(242,237,227,.45);
}
.copy-btn{
  display:inline-flex;align-items:center;gap:6px;
  padding:3px 9px;border:1px solid var(--rule);border-radius:2px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;
  color:rgba(242,237,227,.6);
  transition:color .2s var(--ease),border-color .2s var(--ease),background .2s var(--ease);
}
.copy-btn:hover{color:var(--neon);border-color:var(--neon-dim)}
.copy-btn.is-copied{color:var(--neon);border-color:var(--neon);background:rgba(200,255,60,.1)}

.footer-col{display:flex;flex-direction:column;gap:14px}
.footer-col__title{
  font-family:var(--font-mono);font-size:11px;font-weight:700;
  letter-spacing:.26em;text-transform:uppercase;color:var(--neon);
}
.footer-links{display:flex;flex-direction:column;gap:10px}
.footer-links a{
  font-size:14px;color:rgba(242,237,227,.72);
  border-bottom:1px solid transparent;padding-bottom:2px;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.footer-links a:hover{color:var(--paper);border-bottom-color:var(--neon)}

.footer-meta{
  position:relative;z-index:1;
  display:flex;flex-wrap:wrap;align-items:center;gap:10px 22px;
  padding:22px 24px 34px;
  border-top:1px solid var(--rule);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.04em;
  color:rgba(242,237,227,.5);
}
.footer-meta p{margin:0}
.footer-legal{display:flex;flex-wrap:wrap;gap:16px}
.footer-legal a{color:rgba(242,237,227,.62)}
.footer-legal a:hover{color:var(--neon)}
.footer-meta__year{margin-left:auto}

/* ---------- 7. 通用内容组件 ---------- */
.breadcrumbs{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  padding:20px 0;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;
  color:rgba(242,237,227,.55);
}
.breadcrumbs li{display:flex;align-items:center;gap:8px}
.breadcrumbs li + li::before{content:"/";color:var(--rule)}
.breadcrumbs a:hover{color:var(--neon)}

.reading-layer{
  background:var(--paper);
  color:var(--ink);
}
.prose{max-width:38em;font-size:17px;line-height:1.85;color:var(--ink)}
.prose h2{font-size:clamp(24px,3vw,34px);margin:1.6em 0 .55em;color:var(--ink)}
.prose h3{font-size:clamp(19px,2vw,24px);margin:1.4em 0 .5em;color:var(--ink)}
.prose p{margin:0 0 1.05em}
.prose a{color:var(--violet-deep);border-bottom:1px solid currentColor}
.prose a:hover{color:var(--ink)}
.prose ul{margin:0 0 1.2em;padding:0}
.prose li{position:relative;padding-left:20px;margin-bottom:.5em}
.prose li::before{
  content:"";position:absolute;left:0;top:.8em;
  width:10px;height:1px;background:var(--neon-dim);
}
.prose .note{color:var(--ink-soft);font-size:14px;line-height:1.8}
.prose blockquote{
  margin:1.4em 0;padding:2px 0 2px 20px;
  border-left:2px solid var(--neon-dim);
  color:var(--ink-soft);
}

.media-frame{
  position:relative;overflow:hidden;border:1px solid var(--rule);border-radius:2px;
  background:linear-gradient(140deg,#101720 0%,var(--arena) 65%);
  aspect-ratio:16/9;
}
.media-frame--wide{aspect-ratio:21/9}
.media-frame--tall{aspect-ratio:4/5}
.media-frame--square{aspect-ratio:1/1}
.media-frame__img{width:100%;height:100%;object-fit:cover;filter:saturate(.92) contrast(1.05)}
.media-frame__glow{
  position:absolute;left:-20%;right:-20%;bottom:-45%;height:75%;
  background:
    radial-gradient(60% 100% at 28% 100%,rgba(200,255,60,.20),transparent 70%),
    radial-gradient(55% 100% at 76% 100%,rgba(139,92,246,.28),transparent 72%);
  pointer-events:none;
}
.media-frame__note{
  position:absolute;left:12px;bottom:10px;z-index:1;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;
  color:rgba(242,237,227,.72);
}

/* 显现动画 */
[data-reveal]{
  opacity:0;transform:translateY(12px);
  transition:opacity .55s var(--ease),transform .55s var(--ease);
}
[data-reveal].is-visible{opacity:1;transform:none}

/* ---------- 8. 响应式 ---------- */
@media (max-width:1200px){
  .status-chip{display:none}
}
@media (max-width:1080px){
  .footer-grid{grid-template-columns:1fr 1fr 1fr;gap:28px}
  .footer-brand{grid-column:1 / -1;max-width:none}
}
@media (max-width:960px){
  :root{--header-h:64px}
  .header-actions{gap:8px}
  .search-entry{display:none}
  .btn--ghost{display:none}
  .nav-toggle{display:grid}
  .nav-rail{
    position:fixed;left:0;right:0;top:var(--header-h);
    padding:16px 20px 26px;
    background:rgba(10,13,18,.96);
    -webkit-backdrop-filter:blur(14px);
    backdrop-filter:blur(14px);
    border-bottom:1px solid var(--rule);
    max-height:calc(100vh - var(--header-h));
    overflow-y:auto;
    opacity:0;visibility:hidden;pointer-events:none;
    transform:translateY(-10px);
    transition:opacity .25s var(--ease),transform .25s var(--ease),visibility .25s var(--ease);
  }
  .nav-rail[data-open="true"]{opacity:1;visibility:visible;pointer-events:auto;transform:none}
  .nav-rail__list{flex-direction:column;align-items:stretch;gap:0;overflow:visible}
  .nav-link{
    width:100%;padding:14px 4px;font-size:16px;
    border-bottom:1px solid var(--rule-soft);
  }
  .nav-link:hover{background:transparent}
  .nav-link[aria-current="page"]::after{left:4px;right:auto;width:28px;bottom:8px}
  .grid-12{grid-template-columns:1fr;gap:20px}
  .span-4,.span-5,.span-7,.span-8{grid-column:1 / -1}
  .section{padding:56px 0}
}
@media (max-width:720px){
  body{font-size:16px}
  .wrap{padding:0 18px}
  .brand__sub{display:none}
  .footer-grid{grid-template-columns:1fr;gap:26px;padding:48px 0 32px}
  .footer-meta{padding:20px 18px 30px}
  .footer-meta__year{margin-left:0}
}
@media (max-width:560px){
  .btn--primary{padding:9px 14px;font-size:13px}
}

/* ---------- 9. 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;
  }
  [data-reveal]{opacity:1;transform:none}
  .status-chip__dot{animation:none}
}