/* =========================================================
   南宫28体育 · 共享站点样式  /assets/site.css
   夜间赛场指挥台：深墨绿连续画布 + 极细边界 + 信号青柠
   ========================================================= */

/* ---------- reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:136px}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--font-body);font-size:17px;line-height:1.8;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
img,svg,video{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
ul,ol{margin:0;padding:0;list-style:none}
h1,h2,h3,h4,p,figure,dl,dd,blockquote{margin:0}
h1,h2,h3,h4{font-family:var(--font-display);font-weight:300;line-height:1.04;letter-spacing:.02em}
::selection{background:var(--signal);color:#071A14}

/* ---------- 变量 ---------- */
:root{
  --bg:#071A14;
  --bg-deep:#0C241C;
  --panel:#1B2421;
  --ink:#F4F1E8;
  --signal:#B7FF3C;
  --signal-soft:#C9FF6B;
  --signal-dim:#6FA82A;
  --amber:#FFB020;
  --mist:#8D9B95;
  --line:#2A3A34;
  --alert:#FF5A4E;
  --shell:1240px;
  --font-display:"Barlow Condensed","Oswald","Noto Sans SC","Source Han Sans SC",system-ui,sans-serif;
  --font-body:"Noto Sans SC","Source Han Sans SC",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
}

/* ---------- 焦点与可达性 ---------- */
:focus-visible{outline:2px solid var(--signal);outline-offset:3px;border-radius:2px}
#main-content{display:block;scroll-margin-top:136px}
#main-content:focus{outline:none}
.skip-link{position:fixed;top:10px;left:10px;z-index:200;transform:translateY(-240%);background:var(--signal);color:#071A14;padding:10px 18px;font-size:14px;letter-spacing:.08em;border-radius:2px;transition:transform .18s ease}
.skip-link:focus,.skip-link:focus-visible{transform:translateY(0)}

/* ---------- 布局外壳 ---------- */
.shell{width:100%;max-width:var(--shell);margin-inline:auto;padding-inline:clamp(16px,4vw,40px)}

/* ---------- 页头：状态轨道 ---------- */
.site-header{position:sticky;top:0;z-index:80;background:rgba(7,26,20,.94);border-bottom:1px solid var(--line);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);transition:box-shadow .25s ease,background-color .25s ease}
.site-header[data-scrolled]{background:rgba(7,26,20,.99);box-shadow:0 22px 44px -34px #000}
.scroll-meter{position:absolute;left:0;right:0;bottom:-1px;height:2px;background:rgba(42,58,52,.55);pointer-events:none;z-index:3}
.scroll-meter-bar{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--signal-dim),var(--signal) 65%,var(--amber));transition:width .12s linear}
.header-rail{background:rgba(12,36,28,.88);border-bottom:1px solid var(--line);font-family:var(--font-mono)}
.rail-inner{display:flex;align-items:center;justify-content:space-between;gap:14px;min-height:38px;padding-block:6px;font-size:12px;letter-spacing:.06em;color:var(--mist);flex-wrap:wrap}
.rail-note{display:inline-flex;align-items:center;gap:9px;font-size:12px;letter-spacing:.1em;color:var(--ink)}
.rail-list{display:flex;flex-wrap:wrap;align-items:center;gap:18px}
.rail-link{display:inline-block;padding-bottom:1px;border-bottom:1px solid transparent;transition:color .2s ease,border-color .2s ease}
.rail-link:hover,.rail-link:focus-visible{color:var(--signal);border-bottom-color:var(--signal)}
.pulse-dot{width:7px;height:7px;flex:0 0 auto;border-radius:50%;background:var(--signal);box-shadow:0 0 0 0 rgba(183,255,60,.5);animation:pulse-dot 2.8s ease-out infinite}
@keyframes pulse-dot{
  0%{box-shadow:0 0 0 0 rgba(183,255,60,.45)}
  70%{box-shadow:0 0 0 8px rgba(183,255,60,0)}
  100%{box-shadow:0 0 0 0 rgba(183,255,60,0)}
}

/* ---------- 页头：框架式导航 ---------- */
.header-frame{position:relative}
.frame-inner{display:flex;align-items:stretch;min-height:76px}
.brand-link{display:flex;align-items:center;gap:12px;padding:12px 24px 12px 0;border-right:1px solid var(--line)}
.brand-mark{display:grid;place-items:center;min-width:44px;height:44px;padding:0 8px;font-family:var(--font-display);font-size:26px;line-height:1;letter-spacing:-.01em;color:var(--signal);background:var(--panel);border:1px solid var(--line)}
.brand-name{display:block;font-family:var(--font-display);font-size:21px;letter-spacing:.14em;color:var(--ink);line-height:1.1}
.brand-sub{display:block;margin-top:2px;font-family:var(--font-mono);font-size:10px;letter-spacing:.3em;color:var(--mist)}
.brand-link:hover .brand-name{color:var(--signal)}
.nav-toggle{display:none}
.site-nav{margin-left:auto;display:flex;align-items:stretch}
.nav-list{display:flex;align-items:stretch}
.nav-item{display:flex;align-items:stretch;border-left:1px solid var(--line)}
.nav-item:first-child{border-left:0}
.nav-link{position:relative;display:flex;flex-direction:column;justify-content:center;gap:1px;padding:12px 16px;color:var(--ink);transition:background-color .2s ease,color .2s ease}
.nav-index{font-family:var(--font-mono);font-size:10px;letter-spacing:.22em;color:var(--mist);transition:color .2s ease}
.nav-label{font-size:14px;letter-spacing:.08em;white-space:nowrap}
.nav-link::after{content:"";position:absolute;left:0;right:0;bottom:0;height:2px;background:var(--signal-dim);transform:scaleX(0);transform-origin:left center;transition:transform .24s ease}
.nav-link:hover{background:rgba(183,255,60,.07);color:var(--signal)}
.nav-link:hover .nav-index{color:var(--signal)}
.nav-link:hover::after{transform:scaleX(1)}
.nav-link[aria-current="page"]{color:var(--signal)}
.nav-link[aria-current="page"] .nav-index{color:var(--signal)}
.nav-link[aria-current="page"]::after{transform:scaleX(1);background:var(--signal)}
.header-cta{display:flex;align-items:center;padding-left:20px;margin-left:4px;border-left:1px solid var(--line)}
.nav-toggle-bars{display:flex;flex-direction:column;gap:5px;width:18px}
.nav-toggle-bars span{display:block;height:1.5px;width:100%;background:var(--ink);transition:transform .22s ease,opacity .22s ease}
.nav-toggle-label{font-family:var(--font-mono);font-size:10px;letter-spacing:.24em;color:var(--mist);margin-top:6px}

/* ---------- 按钮 ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 22px;border:1px solid transparent;border-radius:2px;font-family:var(--font-body);font-size:14px;letter-spacing:.1em;line-height:1.2;transition:background-color .2s ease,color .2s ease,border-color .2s ease,transform .2s ease}
.btn-primary{background:var(--signal);border-color:var(--signal);color:#071A14;font-weight:500}
.btn-primary:hover,.btn-primary:focus-visible{background:var(--signal-soft);border-color:var(--signal-soft)}
.btn-ghost{background:transparent;border-color:var(--line);color:var(--ink)}
.btn-ghost:hover,.btn-ghost:focus-visible{border-color:var(--signal);color:var(--signal)}
.btn-sm{padding:9px 16px;font-size:13px}

/* ---------- 页脚 ---------- */
.site-footer{position:relative;margin-top:clamp(48px,8vw,96px);background:var(--bg-deep);border-top:1px solid var(--line)}
.site-footer::before{content:"";position:absolute;left:0;right:0;top:-1px;height:2px;background:linear-gradient(90deg,var(--signal) 0%,rgba(183,255,60,0) 42%,var(--amber) 100%)}
.footer-inner{display:grid;grid-template-columns:minmax(220px,1.05fr) minmax(0,2.2fr) minmax(224px,1fr);gap:clamp(24px,4vw,56px);padding-block:clamp(40px,6vw,72px)}
.footer-wordmark{font-family:var(--font-display);font-size:clamp(26px,3.4vw,40px);letter-spacing:.08em;line-height:1.1;color:var(--ink)}
.wm-accent{color:var(--signal)}
.footer-tagline{margin-top:10px;font-size:13px;letter-spacing:.06em;color:var(--mist);max-width:26ch}
.footer-meta{display:inline-flex;align-items:center;gap:9px;margin-top:18px;padding:6px 11px;font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;color:var(--signal);background:rgba(183,255,60,.06);border:1px solid rgba(183,255,60,.28)}
.footer-nav{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:clamp(16px,2.4vw,28px)}
.footer-title{margin-bottom:14px;font-family:var(--font-mono);font-size:11px;font-weight:400;letter-spacing:.24em;color:var(--mist);line-height:1.6}
.footer-list li+li{margin-top:9px}
.footer-list a{display:inline-block;font-size:14px;letter-spacing:.04em;color:var(--ink);transition:color .2s ease,transform .2s ease}
.footer-list a:hover,.footer-list a:focus-visible{color:var(--signal);transform:translateX(3px)}
.footer-contact{border-left:1px solid var(--line);padding-left:clamp(0px,2vw,24px)}
.contact-item{display:flex;flex-direction:column;gap:2px;margin-bottom:13px}
.contact-label{font-family:var(--font-mono);font-size:10px;letter-spacing:.22em;color:var(--mist)}
.contact-value{font-size:14px;line-height:1.6;color:var(--ink);word-break:break-word}
.contact-note{margin-top:15px;max-width:36ch;font-size:12px;line-height:1.75;color:var(--mist)}
.footer-bottom{border-top:1px solid var(--line)}
.footer-bottom-inner{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px;padding-block:18px;font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;color:var(--mist)}
.footer-links{display:flex;flex-wrap:wrap;align-items:center;gap:10px}
.footer-links a{transition:color .2s ease}
.footer-links a:hover,.footer-links a:focus-visible{color:var(--signal)}

/* ---------- 返回顶部 ---------- */
.to-top{position:fixed;right:clamp(14px,3vw,32px);bottom:clamp(14px,3vw,32px);z-index:90;display:inline-flex;align-items:center;gap:7px;padding:10px 14px;font-family:var(--font-mono);font-size:11px;letter-spacing:.18em;color:var(--signal);background:var(--panel);border:1px solid var(--line);box-shadow:0 14px 34px -22px #000;transition:border-color .2s ease,transform .2s ease}
.to-top[hidden]{display:none}
.to-top:hover,.to-top:focus-visible{border-color:var(--signal);transform:translateY(-2px)}
.to-top-label{letter-spacing:.2em}

/* ---------- 通用章节与中文排版 ---------- */
.section{padding-block:clamp(44px,6vw,88px);border-top:1px solid var(--line)}
.section-head{display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;gap:18px;margin-bottom:clamp(22px,3vw,40px)}
.eyebrow{display:inline-flex;align-items:center;gap:10px;font-family:var(--font-mono);font-size:11px;letter-spacing:.3em;color:var(--signal);text-transform:uppercase}
.eyebrow::before{content:"";width:26px;height:1px;background:var(--signal-dim)}
.display-title{font-family:var(--font-display);font-size:clamp(40px,6.4vw,76px);line-height:.96;letter-spacing:.01em;color:var(--ink)}
.section-title{font-family:var(--font-display);font-size:clamp(24px,3.4vw,34px);letter-spacing:.03em;color:var(--ink)}
.lead{max-width:64ch;font-size:clamp(16px,1.9vw,18px);line-height:1.85;color:var(--mist)}
.prose{max-width:74ch;font-size:17px;line-height:1.9;color:var(--ink)}
.prose p{margin-bottom:1.15em}
.prose h2,.prose h3{font-family:var(--font-display);color:var(--ink);letter-spacing:.03em;margin:1.6em 0 .6em}
.prose h2{font-size:clamp(24px,3vw,30px)}
.prose h3{font-size:20px}
.prose ul,.prose ol{margin:0 0 1.2em;padding-left:1.2em;list-style:none}
.prose li{position:relative;padding-left:16px;margin-bottom:.5em}
.prose li::before{content:"";position:absolute;left:0;top:.85em;width:6px;height:1px;background:var(--signal-dim)}
.prose a{color:var(--signal);border-bottom:1px solid rgba(183,255,60,.4)}
.mono-label{font-family:var(--font-mono);font-size:12px;letter-spacing:.16em;color:var(--mist)}
.rule{height:1px;background:var(--line);border:0;margin-block:clamp(26px,4vw,48px)}

/* ---------- 网格 ---------- */
.grid{display:grid;gap:clamp(16px,2.4vw,28px)}
.grid-2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}
.split{display:grid;grid-template-columns:minmax(200px,264px) minmax(0,1fr);gap:clamp(20px,3vw,44px);align-items:start}

/* ---------- 面板与标签 ---------- */
.panel{padding:clamp(16px,2.4vw,24px);background:var(--panel);border:1px solid var(--line)}
.panel-title{font-family:var(--font-display);font-size:20px;letter-spacing:.04em;color:var(--ink);margin-bottom:8px}
.tag{display:inline-flex;align-items:center;gap:6px;padding:4px 9px;font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;color:var(--signal);background:rgba(183,255,60,.07);border:1px solid var(--signal-dim)}
.tag--amber{color:var(--amber);background:rgba(255,176,32,.09);border-color:rgba(255,176,32,.5)}
.tag--muted{color:var(--mist);background:transparent;border-color:var(--line)}
.arrow-link{display:inline-flex;align-items:center;gap:8px;padding-bottom:2px;font-size:14px;letter-spacing:.06em;color:var(--signal);border-bottom:1px solid transparent;transition:border-color .2s ease}
.arrow-link::after{content:"→";transition:transform .2s ease}
.arrow-link:hover,.arrow-link:focus-visible{border-bottom-color:var(--signal)}
.arrow-link:hover::after{transform:translateX(4px)}

/* ---------- 面包屑 ---------- */
.breadcrumbs{margin-bottom:clamp(18px,3vw,32px)}
.breadcrumbs ol{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;color:var(--mist)}
.breadcrumbs li{display:flex;align-items:center;gap:8px}
.breadcrumbs li+li::before{content:"/";color:var(--signal-dim)}
.breadcrumbs a{color:var(--mist);transition:color .2s ease}
.breadcrumbs a:hover,.breadcrumbs a:focus-visible{color:var(--signal)}
.breadcrumbs [aria-current="page"]{color:var(--ink)}

/* ---------- 图片容器基座 ---------- */
.media-frame{position:relative;overflow:hidden;background:linear-gradient(155deg,#0C241C 0%,#071A14 58%,#123024 100%);border:1px solid var(--line)}
.media-frame img{width:100%;height:100%;object-fit:cover;filter:saturate(.86) brightness(.92)}
.media-frame::after{content:"";position:absolute;inset:0;pointer-events:none;background:linear-gradient(180deg,rgba(7,26,20,0) 46%,rgba(7,26,20,.58) 100%);box-shadow:inset 0 0 0 1px rgba(183,255,60,.08)}
.media-frame--16x9{aspect-ratio:16/9}
.media-frame--4x3{aspect-ratio:4/3}
.media-frame--21x9{aspect-ratio:21/9}

/* ---------- 平板 ---------- */
@media (max-width:1024px){
  .header-cta{display:none}
  .brand-link{padding-right:18px}
  .nav-link{padding:12px 13px}
  .nav-label{font-size:13px;letter-spacing:.05em}
  .footer-inner{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-nav{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-contact{border-left:0;padding-left:0;grid-column:1 / -1}
  .to-top{right:16px;bottom:16px}
}

/* ---------- 移动导航 ---------- */
@media (max-width:900px){
  .nav-toggle{display:inline-flex;flex-direction:column;align-items:center;justify-content:center;margin-left:auto;padding:10px 12px;border:1px solid var(--line);background:rgba(27,36,33,.6);transition:border-color .2s ease,background-color .2s ease}
  .nav-toggle:hover,.nav-toggle:focus-visible{border-color:var(--signal)}
  .frame-inner{min-height:66px;align-items:center;gap:10px}
  .brand-mark{min-width:38px;height:38px;font-size:22px}
  .brand-name{font-size:18px;letter-spacing:.1em}
  .brand-sub{font-size:9px;letter-spacing:.26em}
  .site-nav{position:absolute;left:0;right:0;top:100%;display:block;max-height:0;overflow:hidden;visibility:hidden;background:var(--bg-deep);border-bottom:1px solid var(--line);transition:max-height .32s ease,visibility .32s ease}
  .site-header[data-open] .site-nav{max-height:min(78vh,620px);overflow-y:auto;visibility:visible}
  .site-header[data-open] .nav-toggle{border-color:var(--signal);background:rgba(183,255,60,.08)}
  .site-header[data-open] .nav-toggle-bars span:first-child{transform:translateY(3.25px) rotate(45deg)}
  .site-header[data-open] .nav-toggle-bars span:last-child{transform:translateY(-3.25px) rotate(-45deg)}
  .nav-list{flex-direction:column;align-items:stretch}
  .nav-item{border-left:0;border-top:1px solid var(--line)}
  .nav-item:first-child{border-top:0}
  .nav-link{flex-direction:row;align-items:baseline;gap:14px;padding:16px clamp(16px,4vw,40px)}
  .nav-link::after{display:none}
  .nav-link[aria-current="page"]{background:rgba(183,255,60,.09);box-shadow:inset 3px 0 0 var(--signal)}
  .nav-index{font-size:11px}
  .nav-label{font-size:15px}
  .grid-2,.grid-3,.split{grid-template-columns:minmax(0,1fr)}
  .rail-inner{justify-content:flex-start;gap:10px 16px;font-size:11px}
}

/* ---------- 手机 ---------- */
@media (max-width:640px){
  body{font-size:16px}
  .rail-list{gap:12px}
  .rail-link{font-size:11px;letter-spacing:.04em}
  .footer-inner{grid-template-columns:minmax(0,1fr);padding-block:clamp(32px,8vw,48px)}
  .footer-nav{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-bottom-inner{flex-direction:column;align-items:flex-start;gap:8px}
  .to-top{padding:9px 12px;font-size:10px}
  .display-title{font-size:clamp(34px,9vw,52px)}
}

/* ---------- 减少动效 ---------- */
@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}
  .nav-link::after,.footer-list a,.to-top{transition:none}
  .pulse-dot{animation:none;box-shadow:0 0 0 3px rgba(183,255,60,.18)}
}