/* ==========================================================================
   南宫体育 · 共享样式 /assets/site.css
   夜场数据台：深墨蓝底 + 电光青 + 信号橙
   ========================================================================== */

/* 1 ── 基础重置 ─────────────────────────────────────────────────────────── */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,h5,h6,p,ul,ol,li,figure,blockquote,dl,dd{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,video{display:block;max-width:100%}
button,input,select,textarea{font:inherit;color:inherit;background:none;border:0}
button{cursor:pointer}
a{color:inherit;text-decoration:none}
table{border-collapse:collapse;width:100%}
[hidden]{display:none!important}
[id]{scroll-margin-top:96px}

/* 2 ── CSS 变量 ────────────────────────────────────────────────────────── */
:root{
  --ink:#0A1524;
  --panel:#12233A;
  --grid:#24405F;
  --cyan:#2FE3D0;
  --orange:#FF6B2C;
  --paper:#F4F1E9;
  --mist:#9CB0C6;
  --green:#5BD98C;
  --amber:#FFC24B;
  --label:#E8E2D4;
  --arena:#3A4A5E;

  --rail-w:238px;
  --topbar-h:56px;
  --shell-max:1220px;
  --pad:clamp(16px,3vw,34px);
  --radius:4px;
  --ease:cubic-bezier(.22,.61,.36,1);
  --font-sans:"PingFang SC","HarmonyOS Sans SC","Noto Sans SC","Source Han Sans SC","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:ui-monospace,"JetBrains Mono","Roboto Mono",SFMono-Regular,Menlo,Consolas,monospace;
  --shadow-card:0 22px 42px -32px rgba(0,0,0,.95);
}

/* 3 ── 页面基底：夜间球场灯光 + 数据网格 ───────────────────────────────── */
body{
  font-family:var(--font-sans);
  font-size:16px;
  font-weight:400;
  line-height:1.85;
  color:var(--paper);
  background-color:var(--ink);
  background-image:
    radial-gradient(780px 500px at 88% -8%, rgba(47,227,208,.17), transparent 62%),
    radial-gradient(560px 400px at 2% 12%, rgba(255,107,44,.10), transparent 66%),
    repeating-linear-gradient(to bottom, rgba(36,64,95,.28) 0 1px, transparent 1px 88px),
    repeating-linear-gradient(to right, rgba(36,64,95,.20) 0 1px, transparent 1px 88px);
  background-attachment:fixed;
  overflow-x:hidden;
  padding-top:var(--topbar-h);
  padding-left:0;
}
::selection{background:var(--cyan);color:#04202A}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;border-radius:2px}
main{display:block;min-height:56vh}
.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}

h1,h2,h3,h4{font-weight:900;line-height:1.25;letter-spacing:-.02em}
h1{font-size:clamp(30px,5vw,58px);letter-spacing:-.03em}
h2{font-size:clamp(20px,2.6vw,32px);letter-spacing:-.01em}
h3{font-size:clamp(17px,1.6vw,21px)}
.num,.stat-value,.contact-value,.nav-num,.brand-line,.eyebrow,.footer-region,.footer-legal,.card-meta,.toc-title,.nav-head,.rail-switch-hint,.contact-label,.stat-label{font-family:var(--font-mono)}

/* 4 ── 布局骨架 ────────────────────────────────────────────────────────── */
.container{width:100%;max-width:var(--shell-max);margin-inline:auto;padding-inline:var(--pad)}
.section{padding-block:clamp(36px,5vw,76px);border-top:1px solid rgba(36,64,95,.55)}
.section--plain{border-top:0}
.section--tight{padding-block:clamp(20px,3vw,38px)}
.section-head{display:flex;flex-wrap:wrap;align-items:flex-end;gap:8px 22px;margin-bottom:clamp(18px,2.4vw,30px)}
.section-title{position:relative;padding-left:14px;font-size:clamp(20px,2.6vw,32px);font-weight:900;letter-spacing:-.01em}
.section-title::before{content:"";position:absolute;left:0;top:.2em;bottom:.2em;width:6px;background:var(--cyan);border-radius:1px}
.section-note{font-size:14px;color:var(--mist);max-width:58ch}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:12px;letter-spacing:.16em;text-transform:uppercase;color:var(--cyan)}
.eyebrow::before{content:"";width:18px;height:1px;background:var(--cyan)}
.divider{border-top:1px solid var(--grid);margin-block:clamp(18px,2.4vw,28px)}

.grid{display:grid;gap:clamp(14px,1.8vw,22px);grid-template-columns:1fr}
@media (min-width:720px){
  .grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (min-width:1080px){
  .grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
  .grid--4{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (min-width:1280px){
  .grid--4{grid-template-columns:repeat(4,minmax(0,1fr))}
}

/* 5 ── 按钮 / 标签 / 卡片 / 数据 ───────────────────────────────────────── */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  min-height:42px;padding:10px 20px;border:1px solid var(--grid);border-radius:var(--radius);
  font-size:14px;font-weight:700;line-height:1.2;letter-spacing:.02em;color:var(--paper);
  background:rgba(18,35,58,.72);
  transition:border-color .2s var(--ease),background-color .2s var(--ease),color .2s var(--ease),transform .2s var(--ease);
}
.btn:hover{border-color:var(--cyan);color:var(--cyan)}
.btn:active{transform:translateY(1px)}
.btn--primary{background:var(--orange);border-color:var(--orange);color:#1A0B03}
.btn--primary:hover{background:#FF8047;border-color:#FF8047;color:#1A0B03}
.btn--ghost{background:transparent;border-color:var(--grid);color:var(--paper)}
.btn--block{width:100%}

.tag{
  display:inline-flex;align-items:center;gap:6px;padding:3px 9px;
  border:1px solid var(--grid);border-radius:2px;
  font-size:12px;font-weight:700;line-height:1.5;letter-spacing:.12em;color:var(--mist);
  background:rgba(18,35,58,.6);
}
.tag--new{background:var(--orange);border-color:var(--orange);color:#1A0B03;letter-spacing:.08em}
.tag--stage{background:rgba(47,227,208,.12);border-color:rgba(47,227,208,.55);color:var(--cyan)}
.tag--live{background:rgba(91,217,140,.12);border-color:rgba(91,217,140,.5);color:var(--green)}
.tag--alert{background:rgba(255,194,75,.12);border-color:rgba(255,194,75,.5);color:var(--amber)}
.tag--paper{background:var(--label);border-color:#C9C0AC;color:#1A2434;letter-spacing:.1em}

.card{
  position:relative;padding:clamp(16px,2vw,22px);
  background:linear-gradient(180deg,rgba(18,35,58,.94),rgba(18,35,58,.62));
  border:1px solid var(--grid);border-radius:var(--radius);box-shadow:var(--shadow-card);
  transition:border-color .2s var(--ease),transform .2s var(--ease);
}
.card::after{
  content:"";position:absolute;right:-1px;top:-1px;width:13px;height:13px;
  border-top:2px solid var(--cyan);border-right:2px solid var(--cyan);opacity:.65;
}
.card:hover{border-color:var(--cyan);transform:translateY(-4px)}
.card-head{display:flex;align-items:flex-start;justify-content:space-between;gap:12px;margin-bottom:10px}
.card-title{font-size:17px;font-weight:900;line-height:1.4;letter-spacing:-.01em}
.card-meta{font-size:11px;letter-spacing:.08em;color:var(--mist)}
.card-body{font-size:15px;color:#D9E0EA}
.card--paper{background:var(--label);border-color:#C9C0AC;color:#16243A}
.card--paper .card-title{color:#111E2E}
.card--paper .card-body{color:#3A4658}
.card--paper .card-meta{color:#6B6455}
.card--paper::after{border-color:var(--orange);opacity:.9}

.stat{display:flex;flex-direction:column;gap:2px;padding-left:12px;border-left:2px solid var(--grid)}
.stat-value{font-size:clamp(22px,3vw,34px);font-weight:700;line-height:1.1;letter-spacing:.02em;color:var(--cyan)}
.stat-label{font-size:12px;letter-spacing:.08em;color:var(--mist)}
.num{font-size:inherit;letter-spacing:.02em}

/* 6 ── 图片容器基础规则（供页面阶段放 WebP 图） ────────────────────────── */
.media{
  position:relative;overflow:hidden;aspect-ratio:16/9;
  border:1px solid var(--grid);border-radius:var(--radius);
  background:
    radial-gradient(120% 90% at 20% 0%, rgba(47,227,208,.14), transparent 60%),
    linear-gradient(135deg,#132743,#0A1524);
}
.media img{width:100%;height:100%;object-fit:cover;transition:transform .5s var(--ease)}
.media--wide{aspect-ratio:21/9}
.media--tall{aspect-ratio:3/4}
.media--square{aspect-ratio:1/1}
.media:hover img{transform:scale(1.04)}
.media-cap{
  position:absolute;left:0;right:0;bottom:0;padding:10px 12px;font-size:12px;color:var(--paper);
  background:linear-gradient(0deg,rgba(10,21,36,.94),rgba(10,21,36,0));
}
.media-frame{padding:8px;border:1px solid var(--grid);border-radius:var(--radius);background:rgba(18,35,58,.55)}

/* 7 ── 面包屑 / 长文体 ─────────────────────────────────────────────────── */
.crumbs{margin-top:clamp(18px,2.4vw,28px)}
.crumbs ol{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;color:var(--mist)}
.crumbs li{display:flex;align-items:center;gap:8px}
.crumbs li+li::before{content:"/";color:var(--grid)}
.crumb{color:var(--mist);transition:color .18s var(--ease)}
.crumb:hover{color:var(--cyan)}
.crumb--current{color:var(--paper)}

.prose{max-width:70ch;font-size:16.5px;line-height:1.85}
.prose p+p{margin-top:1.2em}
.prose h2{margin-top:1.7em;margin-bottom:.5em}
.prose h3{margin-top:1.3em;margin-bottom:.4em}
.prose ul,.prose ol{margin:1em 0}
.prose li{position:relative;padding-left:16px;margin-bottom:.55em}
.prose li::before{content:"";position:absolute;left:0;top:.78em;width:6px;height:6px;border-radius:50%;background:var(--cyan)}
.prose strong{font-weight:900;color:var(--paper)}
.prose a{border-bottom:1px solid var(--cyan);color:var(--cyan)}

/* 8 ── 跳转链接 ───────────────────────────────────────────────────────── */
.skip-link{
  position:fixed;left:12px;top:12px;z-index:120;
  padding:10px 16px;border-radius:var(--radius);
  background:var(--cyan);color:#04202A;font-weight:700;
  transform:translateY(-180%);
  transition:transform .18s var(--ease);
}
.skip-link:focus{transform:translateY(0)}

/* 9 ── 头部：移动端顶部窄条 + 底部章节抽屉 ─────────────────────────────── */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:80;
  display:flex;align-items:center;gap:10px;
  height:var(--topbar-h);padding:0 12px;
  background:linear-gradient(180deg,rgba(10,21,36,.99),rgba(10,21,36,.87));
  border-bottom:1px solid var(--grid);
  backdrop-filter:blur(8px);
}
.rail{display:flex;align-items:center;gap:10px;flex:1;min-width:0}

/* 品牌 */
.brand{display:flex;align-items:center;gap:10px;min-width:0}
.brand-mark{
  position:relative;flex:none;width:34px;height:34px;display:grid;place-items:center;
  border:1px solid var(--cyan);border-radius:2px;background:rgba(47,227,208,.10);
  color:var(--cyan);font-size:12px;font-weight:900;line-height:1;letter-spacing:-.02em;
}
.brand-mark::after{
  content:"";position:absolute;right:-1px;bottom:-1px;width:8px;height:8px;
  border-right:2px solid var(--orange);border-bottom:2px solid var(--orange);
}
.brand-text{display:flex;flex-direction:column;min-width:0}
.brand-name{font-size:16px;font-weight:900;line-height:1.2;letter-spacing:-.02em;white-space:nowrap}
.brand-line{display:none;font-size:11px;line-height:1.3;letter-spacing:.08em;color:var(--mist);white-space:nowrap}

/* 联赛切换快捷入口（桌面导轨内） */
.rail-switch{display:none}

/* 主导航：移动端为底部抽屉 */
.main-nav{
  position:fixed;left:0;right:0;bottom:0;z-index:90;
  max-height:78vh;overflow-y:auto;
  padding:18px var(--pad) calc(22px + env(safe-area-inset-bottom,0px));
  background:linear-gradient(180deg,rgba(18,35,58,.99),rgba(10,21,36,.99));
  border-top:1px solid var(--cyan);border-radius:12px 12px 0 0;
  box-shadow:0 -30px 56px -34px rgba(0,0,0,.98);
  transform:translateY(103%);opacity:0;visibility:hidden;
  transition:transform .26s var(--ease),opacity .26s var(--ease),visibility .26s linear;
}
.main-nav[data-open]{transform:translateY(0);opacity:1;visibility:visible}
body.nav-open{overflow:hidden}

.nav-head{
  display:flex;align-items:center;justify-content:space-between;
  margin-bottom:12px;font-size:12px;letter-spacing:.16em;color:var(--mist);
}
.nav-head-count{color:var(--cyan)}
.nav-search{display:block;margin-bottom:14px}
.nav-search-input{
  width:100%;height:40px;padding:0 12px;font-size:14px;color:var(--paper);
  background:rgba(10,21,36,.82);border:1px solid var(--grid);border-radius:var(--radius);
  transition:border-color .18s var(--ease);
}
.nav-search-input::placeholder{color:#6F86A0}
.nav-search-input:focus{border-color:var(--cyan);outline:none}
.nav-list{display:grid;gap:4px}
.nav-link{
  display:flex;align-items:center;gap:12px;padding:11px 12px;
  border-left:3px solid transparent;border-radius:2px;
  font-size:16px;font-weight:700;color:var(--paper);
  transition:background-color .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease);
}
.nav-num{font-size:11px;letter-spacing:.08em;color:var(--mist)}
.nav-link:hover{background:rgba(47,227,208,.08);border-left-color:var(--cyan)}
.nav-link[aria-current="page"]{color:var(--cyan);background:rgba(47,227,208,.13);border-left-color:var(--cyan)}
.nav-link[aria-current="page"] .nav-num{color:var(--cyan)}
.nav-empty{padding:10px 12px;font-size:14px;color:var(--mist)}

/* 章节索引 */
.rail-toc{margin-top:16px;padding-top:14px;border-top:1px solid var(--grid)}
.toc-title{margin-bottom:8px;font-size:11px;letter-spacing:.16em;color:var(--mist)}
.toc-list{display:grid;gap:2px}
.toc-item{display:block}
.toc-link{
  position:relative;display:block;width:100%;padding:7px 10px 7px 12px;
  text-align:left;font-size:13px;color:var(--mist);border-radius:2px;
  transition:color .2s var(--ease),background-color .2s var(--ease);
}
.toc-link::before{
  content:"";position:absolute;left:0;top:0;bottom:0;width:2px;background:transparent;
  transition:background-color .28s var(--ease);
}
.toc-link:hover{color:var(--paper);background:rgba(47,227,208,.06)}
.toc-link[aria-current="true"]{color:var(--cyan);background:rgba(47,227,208,.09)}
.toc-link[aria-current="true"]::before{background:var(--cyan)}

/* 导轨底部 */
.rail-foot{display:flex;align-items:center;gap:10px;margin-left:auto}
.rail-foot .tag{display:none}
.rail-foot .btn{min-height:36px;padding:8px 14px;font-size:13px;white-space:nowrap}
.rail-legal{display:none}
.to-top{
  position:fixed;right:14px;bottom:calc(18px + env(safe-area-inset-bottom,0px));z-index:70;
  padding:11px 15px;border-radius:999px;border:1px solid var(--cyan);background:rgba(18,35,58,.95);
  color:var(--cyan);font-size:13px;font-weight:700;
  box-shadow:0 16px 30px -20px rgba(0,0,0,.98);
  transition:background-color .2s var(--ease),color .2s var(--ease);
}
.to-top:hover{background:var(--cyan);color:#04202A}

/* 移动端开关 */
.nav-toggle{
  flex:none;display:inline-flex;align-items:center;gap:8px;height:38px;padding:0 12px;
  border:1px solid var(--grid);border-radius:var(--radius);background:rgba(18,35,58,.72);
  font-size:13px;font-weight:700;letter-spacing:.04em;color:var(--paper);
  transition:border-color .18s var(--ease),color .18s var(--ease);
}
.nav-toggle:hover{border-color:var(--cyan);color:var(--cyan)}
.nav-toggle-text{white-space:nowrap}
.nav-toggle-bars{position:relative;display:block;width:16px;height:2px;background:currentColor}
.nav-toggle-bars::before,.nav-toggle-bars::after{
  content:"";position:absolute;left:0;width:16px;height:2px;background:currentColor;
  transition:transform .2s var(--ease),top .2s var(--ease);
}
.nav-toggle-bars::before{top:-5px}
.nav-toggle-bars::after{top:5px}
.nav-toggle[aria-expanded="true"]{border-color:var(--cyan);color:var(--cyan)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars{background:transparent}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::before{top:0;transform:rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after{top:0;transform:rotate(-45deg)}

/* 滚动进度条 */
.progress-track{
  position:fixed;left:0;right:0;top:var(--topbar-h);height:3px;z-index:100;
  background:rgba(36,64,95,.5);pointer-events:none;
}
.progress-fill{
  display:block;height:100%;width:100%;transform:scaleX(0);transform-origin:0 50%;
  background:linear-gradient(90deg,var(--cyan),var(--orange));
}

/* 10 ── 页脚 ───────────────────────────────────────────────────────────── */
.site-footer{
  position:relative;
  margin-top:clamp(40px,6vw,90px);
  padding-block:clamp(32px,4vw,56px) 20px;
  border-top:1px solid var(--grid);
  background:linear-gradient(180deg,rgba(18,35,58,.55),rgba(10,21,36,.96) 62%);
}
.site-footer::before{content:"";position:absolute;top:-1px;left:0;width:132px;height:2px;background:var(--cyan)}
.footer-top{display:grid;gap:clamp(24px,3vw,40px);grid-template-columns:1fr}
@media (min-width:720px){
  .footer-top{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (min-width:1080px){
  .footer-top{grid-template-columns:1.1fr 2.1fr 1.15fr}
}
.footer-brand{display:flex;flex-direction:column;align-items:flex-start;gap:14px}
.footer-mark{position:relative;padding-left:12px;font-size:20px;font-weight:900;letter-spacing:-.02em}
.footer-mark::before{content:"";position:absolute;left:0;top:.3em;bottom:.3em;width:5px;background:var(--orange)}
.footer-line{max-width:34ch;font-size:14px;line-height:1.8;color:var(--mist)}
.footer-cols{display:grid;grid-template-columns:repeat(auto-fit,minmax(120px,1fr));gap:20px}
.footer-col{min-width:0}
.footer-col-title{
  margin-bottom:12px;padding-bottom:8px;border-bottom:1px solid var(--grid);
  font-size:13px;font-weight:900;letter-spacing:.1em;color:var(--paper);
}
.footer-links{display:grid;gap:8px}
.footer-links a{
  display:inline-block;font-size:14px;color:var(--mist);
  transition:color .18s var(--ease),padding-left .18s var(--ease);
}
.footer-links a:hover{color:var(--cyan);padding-left:4px}
.contact-list{display:grid;gap:10px}
.contact-item{display:grid;grid-template-columns:52px 1fr;gap:10px;align-items:baseline;font-size:13px}
.contact-label{font-size:11px;letter-spacing:.1em;color:var(--cyan)}
.contact-value{font-size:13px;color:var(--paper);word-break:break-all}
.contact-note{margin-top:12px;font-size:12px;line-height:1.75;color:var(--mist)}
.footer-bottom{
  display:flex;flex-wrap:wrap;gap:8px 18px;align-items:center;justify-content:space-between;
  margin-top:clamp(26px,3vw,40px);padding-top:16px;
  border-top:1px solid rgba(36,64,95,.6);
  font-size:12px;letter-spacing:.02em;color:var(--mist);
}
.footer-region{color:var(--mist)}
.footer-legal{color:var(--mist)}

/* 11 ── 前端组件：联赛切换 Tab / 分类筛选 ───────────────────────────────── */
.tabs{margin-top:clamp(18px,2.4vw,28px)}
.tab-list{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:18px;border-bottom:1px solid var(--grid)}
.tab{
  position:relative;padding:10px 16px;font-size:14px;font-weight:700;color:var(--mist);
  border:1px solid transparent;border-bottom:0;border-radius:var(--radius) var(--radius) 0 0;
  transition:color .18s var(--ease),background-color .18s var(--ease),border-color .18s var(--ease);
}
.tab:hover{color:var(--paper)}
.tab[aria-selected="true"]{color:var(--cyan);background:rgba(47,227,208,.10);border-color:var(--grid)}
.tab[aria-selected="true"]::after{content:"";position:absolute;left:0;right:0;bottom:-1px;height:2px;background:var(--cyan)}
.tab-panel{padding-top:4px}
.tab-panel[hidden]{display:none!important}

.filter-bar{display:flex;flex-wrap:wrap;align-items:center;gap:8px;margin-bottom:18px}
.filter-input{
  flex:1 1 200px;min-width:0;height:40px;padding:0 12px;font-size:14px;color:var(--paper);
  background:rgba(10,21,36,.82);border:1px solid var(--grid);border-radius:var(--radius);
  transition:border-color .18s var(--ease);
}
.filter-input::placeholder{color:#6F86A0}
.filter-input:focus{border-color:var(--cyan);outline:none}
.filter-chip{
  padding:8px 14px;border:1px solid var(--grid);border-radius:999px;
  font-size:13px;font-weight:700;color:var(--mist);background:rgba(18,35,58,.6);
  transition:color .18s var(--ease),border-color .18s var(--ease),background-color .18s var(--ease);
}
.filter-chip:hover{border-color:var(--cyan);color:var(--cyan)}
.filter-chip[aria-pressed="true"]{background:var(--cyan);border-color:var(--cyan);color:#04202A}
.filter-empty{padding:16px 0;font-size:14px;color:var(--mist)}

/* 12 ── 显现动效 ───────────────────────────────────────────────────────── */
html.js [data-reveal]{
  opacity:0;transform:translateY(12px);
  transition:opacity .5s var(--ease) var(--reveal-delay,0ms),transform .5s var(--ease) var(--reveal-delay,0ms);
}
html.js [data-reveal].is-in{opacity:1;transform:none}

/* 13 ── 桌面端：左侧固定导轨 ──────────────────────────────────────────── */
@media (min-width:1080px){
  body{padding-top:0;padding-left:var(--rail-w)}

  .site-header{
    top:0;left:0;right:auto;bottom:0;width:var(--rail-w);height:100vh;height:100dvh;
    flex-direction:column;align-items:stretch;gap:0;padding:0;
    border-bottom:0;border-right:1px solid var(--grid);
    background:linear-gradient(180deg,#0C1B2E 0%,#11223A 46%,#0A1524 100%);
    backdrop-filter:none;
  }
  .rail{
    flex-direction:column;align-items:stretch;gap:0;
    height:100%;min-height:0;padding:24px 18px 18px;overflow:hidden;
  }

  .brand{gap:12px}
  .brand-mark{width:42px;height:42px;font-size:14px}
  .brand-name{font-size:19px}
  .brand-line{display:block}

  .rail-switch{
    display:flex;flex-direction:column;gap:2px;margin-top:18px;padding:11px 12px;
    border:1px solid var(--grid);border-left:3px solid var(--orange);border-radius:2px;
    background:rgba(18,35,58,.6);
    transition:border-color .2s var(--ease),background-color .2s var(--ease);
  }
  .rail-switch:hover{border-color:var(--cyan);border-left-color:var(--cyan);background:rgba(47,227,208,.08)}
  .rail-switch-label{font-size:14px;font-weight:900;letter-spacing:-.01em;color:var(--paper)}
  .rail-switch-hint{font-size:11px;letter-spacing:.08em;color:var(--mist)}

  .main-nav{
    position:static;flex:1;min-height:0;max-height:none;overflow-y:auto;
    margin-top:20px;padding:0;border:0;border-radius:0;box-shadow:none;
    background:none;transform:none;opacity:1;visibility:visible;
  }
  .nav-head{margin-bottom:10px}
  .nav-search-input{height:36px;font-size:13px}
  .nav-link{padding:9px 10px;font-size:15px}

  .rail-toc{display:block;margin-top:18px}
  .toc-link{font-size:12.5px}

  .rail-foot{
    flex-direction:column;align-items:stretch;gap:10px;
    margin:16px 0 0;padding-top:16px;border-top:1px solid var(--grid);
  }
  .rail-foot .tag{display:inline-flex;align-self:flex-start}
  .rail-foot .btn{width:100%;min-height:42px;padding:10px 18px;font-size:14px}
  .rail-legal{display:block;font-size:11px;line-height:1.7;letter-spacing:.02em;color:var(--mist)}
  .to-top{
    position:static;width:100%;padding:9px 12px;border-radius:var(--radius);
    background:rgba(18,35,58,.7);box-shadow:none;
  }

  .nav-toggle{display:none}
  .progress-track{top:0;left:var(--rail-w);right:0}
}

/* 14 ── 降低动效偏好 ───────────────────────────────────────────────────── */
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms!important;
    animation-iteration-count:1!important;
    transition-duration:.001ms!important;
  }
  html.js [data-reveal]{opacity:1;transform:none}
  .card:hover{transform:none}
  .media:hover img{transform:none}
  .footer-links a:hover{padding-left:0}
}