/* ============================================================
   博雅棋牌汇 · 共享样式 /assets/site.css
   夜间棋牌室 × 数字档案室：墨绿、暖金、苗银冷光、电光青微交互
   ============================================================ */

:root{
  --ink-900:#0E2A24;
  --ink-950:#0A1F1B;
  --ink-700:#17453B;
  --gold-500:#C9A45C;
  --gold-200:#E8D8B0;
  --silver:#A9C7C2;
  --cyan:#27D3C2;
  --cinnabar:#B6402E;
  --paper:#F3F1EA;
  --paper-soft:#FBFAF5;
  --char:#151816;
  --mist:#6F7F7A;
  --body-ink:#39423D;

  --hairline:rgba(169,199,194,.34);
  --hairline-strong:rgba(111,127,122,.45);
  --hairline-gold:rgba(201,164,92,.42);
  --on-dark:rgba(243,241,234,.86);
  --on-dark-soft:rgba(243,241,234,.6);

  --font-display:"Noto Serif SC","Songti SC","STSong",serif;
  --font-body:"Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"IBM Plex Mono","JetBrains Mono","SFMono-Regular",Consolas,monospace;

  --shell:1280px;
  --gutter:clamp(18px,4.2vw,48px);
  --baseline:8px;
  --ease:cubic-bezier(.2,.7,.3,1);
}

/* ---------- 1. Reset & 基础 ---------- */
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  margin:0;
  background:var(--paper);
  color:var(--char);
  font-family:var(--font-body);
  font-size:15px;
  line-height:1.78;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
h1,h2,h3,h4,h5,p,ul,ol,dl,figure,blockquote{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,video{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit}
table{border-collapse:collapse}
[id]{scroll-margin-top:120px}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px}
::selection{background:var(--gold-200);color:var(--char)}

@media (min-width:961px){
  body{font-size:16px}
}

/* ---------- 2. 跳过链接 ---------- */
.skip-link{
  position:absolute;
  left:-9999px;
  top:0;
  z-index:200;
  padding:12px 20px;
  background:var(--gold-500);
  color:var(--ink-900);
  font-family:var(--font-mono);
  font-size:13px;
  letter-spacing:.1em;
  border:1px solid var(--ink-900);
}
.skip-link:focus{
  position:fixed;
  left:16px;
  top:14px;
}

/* ---------- 3. 布局容器 ---------- */
.shell{
  width:100%;
  max-width:var(--shell);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.page{
  display:block;
  padding-block:clamp(30px,4.6vw,60px) clamp(56px,7vw,96px);
}
.page--narrow{
  max-width:980px;
  margin-inline:auto;
}
.grid{
  display:grid;
  grid-template-columns:repeat(12,minmax(0,1fr));
  gap:calc(var(--baseline) * 3) calc(var(--baseline) * 3);
}
.span-2{grid-column:span 2}
.span-3{grid-column:span 3}
.span-4{grid-column:span 4}
.span-5{grid-column:span 5}
.span-6{grid-column:span 6}
.span-7{grid-column:span 7}
.span-8{grid-column:span 8}
.span-9{grid-column:span 9}
.span-12{grid-column:span 12}

/* ---------- 4. 排版组件 ---------- */
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.24em;
  color:var(--mist);
  text-transform:uppercase;
}
.eyebrow::before{
  content:"";
  width:28px;
  height:1px;
  background:var(--gold-500);
  flex:0 0 auto;
}
.title-xl{
  font-family:var(--font-display);
  font-weight:600;
  font-size:clamp(30px,4.4vw,54px);
  line-height:1.16;
  letter-spacing:.02em;
  color:var(--char);
}
.title-lg{
  font-family:var(--font-display);
  font-weight:600;
  font-size:clamp(24px,3vw,38px);
  line-height:1.24;
  letter-spacing:.03em;
  color:var(--char);
}
.title-md{
  font-family:var(--font-display);
  font-weight:600;
  font-size:clamp(19px,2vw,26px);
  line-height:1.34;
  letter-spacing:.03em;
  color:var(--char);
}
.lede{
  font-size:15.5px;
  line-height:1.86;
  color:var(--body-ink);
  max-width:62ch;
}
.note{
  font-size:13px;
  line-height:1.72;
  color:var(--mist);
}
.mono{
  font-family:var(--font-mono);
  letter-spacing:.04em;
  font-variant-numeric:tabular-nums;
}
.rule-line{
  height:1px;
  border:0;
  background:var(--hairline-gold);
  margin:clamp(22px,3vw,38px) 0;
}
.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;
}

/* ---------- 5. 按钮与行内链接 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:10px;
  padding:12px 22px;
  border:1px solid var(--gold-500);
  background:var(--gold-500);
  color:var(--ink-900);
  font-family:var(--font-body);
  font-size:13.5px;
  font-weight:600;
  letter-spacing:.08em;
  border-radius:0;
  cursor:pointer;
  transition:background .25s var(--ease),color .25s var(--ease),border-color .25s var(--ease);
}
.btn:hover{background:transparent;color:var(--gold-500)}
.btn--primary{background:var(--gold-500);color:var(--ink-900);border-color:var(--gold-500)}
.btn--primary:hover{background:transparent;color:var(--gold-500)}
.btn--ghost{
  background:transparent;
  color:var(--ink-700);
  border-color:var(--hairline-strong);
}
.btn--ghost:hover{
  background:rgba(201,164,92,.14);
  border-color:var(--gold-500);
  color:var(--ink-900);
}
.btn--quiet{
  background:transparent;
  border-color:transparent;
  border-bottom:1px solid var(--gold-500);
  color:var(--ink-900);
  padding:6px 2px;
}
.btn--quiet:hover{color:var(--gold-500);border-bottom-color:var(--cyan)}
.link-underline{
  color:var(--ink-700);
  border-bottom:1px solid var(--hairline-strong);
  padding-bottom:1px;
  transition:color .2s var(--ease),border-color .2s var(--ease),background-color .2s var(--ease);
}
.link-underline:hover{
  color:var(--ink-900);
  border-bottom-color:var(--cyan);
  background-color:rgba(39,211,194,.16);
}

/* ---------- 6. 页头 ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:80;
  background:var(--ink-900);
  color:var(--paper);
  border-bottom:1px solid var(--hairline-gold);
  box-shadow:0 12px 28px rgba(10,31,27,.18);
}
.header-rail{
  background:var(--ink-950);
  border-bottom:1px solid rgba(169,199,194,.16);
}
.rail-inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  padding-block:7px;
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.2em;
  color:rgba(169,199,194,.78);
}
.rail-coord{white-space:nowrap}
.rail-note{
  color:rgba(232,216,176,.72);
  letter-spacing:.24em;
}
.rail-status{
  display:inline-flex;
  align-items:center;
  gap:8px;
  color:rgba(39,211,194,.88);
  white-space:nowrap;
}
.rail-dot{
  width:6px;
  height:6px;
  background:var(--cyan);
  box-shadow:0 0 0 3px rgba(39,211,194,.16);
  flex:0 0 auto;
}
.header-inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:24px;
  padding-block:14px;
}
.brand{
  display:inline-flex;
  align-items:center;
  gap:12px;
  color:var(--paper);
  padding-block:2px;
  flex:0 0 auto;
}
.brand-mark,
.footer-mark{
  display:grid;
  grid-template-columns:repeat(2,1fr);
  grid-template-rows:repeat(2,1fr);
  gap:3px;
  width:30px;
  height:30px;
  flex:0 0 auto;
}
.mark-cell{
  display:block;
  background:rgba(169,199,194,.5);
  transition:background .25s var(--ease),opacity .25s var(--ease);
}
.mark-cell:nth-child(1){background:var(--gold-500)}
.mark-cell:nth-child(2){background:rgba(169,199,194,.42)}
.mark-cell:nth-child(3){background:rgba(169,199,194,.42)}
.mark-cell:nth-child(4){background:var(--cyan);opacity:.78}
.brand:hover .mark-cell:nth-child(2),
.brand:hover .mark-cell:nth-child(3),
.brand:focus-visible .mark-cell:nth-child(2),
.brand:focus-visible .mark-cell:nth-child(3){background:var(--gold-200)}
.brand-text{
  display:flex;
  flex-direction:column;
  gap:3px;
  line-height:1.1;
}
.brand-name{
  font-family:var(--font-display);
  font-size:19px;
  letter-spacing:.14em;
  color:var(--paper);
}
.brand-sub{
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.22em;
  color:rgba(169,199,194,.8);
}
.site-nav{
  display:flex;
  align-items:center;
  gap:clamp(10px,1.5vw,24px);
}
.nav-list{
  display:flex;
  align-items:center;
  gap:2px;
}
.nav-item{position:relative}
.nav-link{
  position:relative;
  display:inline-block;
  padding:9px 11px;
  font-size:14px;
  letter-spacing:.06em;
  color:rgba(243,241,234,.82);
  transition:color .2s var(--ease);
}
.nav-link::after{
  content:"";
  position:absolute;
  left:11px;
  right:11px;
  bottom:4px;
  height:1px;
  background:var(--gold-500);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform .28s var(--ease);
}
.nav-link:hover{color:var(--gold-200)}
.nav-link:hover::after{transform:scaleX(1)}
.nav-link[aria-current="page"]{color:var(--gold-200)}
.nav-link[aria-current="page"]::after{
  transform:scaleX(1);
  background:var(--cyan);
}
.nav-utils{
  display:flex;
  align-items:center;
  gap:8px;
  padding-left:clamp(10px,1.4vw,22px);
  border-left:1px solid rgba(169,199,194,.28);
}
.util-link{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.16em;
  color:rgba(169,199,194,.88);
  padding:5px 9px;
  border:1px solid transparent;
  transition:color .2s var(--ease),border-color .2s var(--ease),background-color .2s var(--ease);
}
.util-link:hover{
  color:var(--cyan);
  border-color:rgba(39,211,194,.55);
}
.util-link--accent{
  color:var(--gold-200);
  border-color:rgba(201,164,92,.45);
}
.util-link--accent:hover{
  background:var(--gold-200);
  border-color:var(--gold-200);
  color:var(--ink-900);
}
.nav-cta{
  white-space:nowrap;
  font-size:12.5px;
  padding:10px 18px;
}
.nav-toggle{
  display:none;
  align-items:center;
  gap:10px;
  background:transparent;
  border:1px solid rgba(169,199,194,.42);
  color:var(--paper);
  padding:9px 12px;
  cursor:pointer;
  transition:border-color .2s var(--ease),background-color .2s var(--ease);
}
.nav-toggle:hover{border-color:var(--gold-500)}
.nav-toggle-box{
  display:grid;
  gap:4px;
  width:16px;
  flex:0 0 auto;
}
.nav-toggle-bar{
  display:block;
  height:1.5px;
  background:var(--gold-200);
  transition:transform .25s var(--ease);
}
.nav-toggle-label{
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.2em;
  color:rgba(243,241,234,.84);
}
.site-header[data-nav-open] .nav-toggle-bar:nth-child(1){
  transform:translateY(2.75px) rotate(45deg);
}
.site-header[data-nav-open] .nav-toggle-bar:nth-child(2){
  transform:translateY(-2.75px) rotate(-45deg);
}
.scroll-progress{
  position:absolute;
  left:0;
  right:0;
  bottom:-1px;
  height:2px;
  background:rgba(201,164,92,.16);
  opacity:0;
  pointer-events:none;
  transition:opacity .3s var(--ease);
}
.scroll-progress[data-active="true"]{opacity:1}
.scroll-progress-bar{
  display:block;
  height:100%;
  width:100%;
  transform:scaleX(0);
  transform-origin:0 50%;
  background:linear-gradient(90deg,var(--gold-500),var(--cyan));
  transition:transform .12s linear;
}

/* ---------- 7. 页脚 ---------- */
.site-footer{
  background:var(--ink-900);
  color:var(--on-dark);
  border-top:1px solid var(--hairline-gold);
  margin-top:clamp(48px,7vw,96px);
  position:relative;
}
.site-footer::before{
  content:"";
  position:absolute;
  inset:0 0 auto 0;
  height:4px;
  background:repeating-linear-gradient(90deg,var(--gold-500) 0 14px,transparent 14px 28px);
  opacity:.5;
}
.footer-grid{
  display:grid;
  grid-template-columns:1.5fr 1fr 1fr 1.3fr;
  gap:clamp(24px,3.4vw,48px);
  padding-block:clamp(36px,4.6vw,58px);
  border-bottom:1px solid rgba(169,199,194,.16);
}
.footer-brand{
  display:flex;
  flex-direction:column;
  gap:10px;
}
.footer-mark{
  width:26px;
  height:26px;
  margin-bottom:4px;
}
.footer-name{
  font-family:var(--font-display);
  font-size:20px;
  letter-spacing:.16em;
  color:var(--paper);
}
.footer-tag{
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.24em;
  color:var(--gold-200);
  opacity:.88;
}
.footer-note{
  font-size:13px;
  line-height:1.8;
  color:var(--on-dark-soft);
  max-width:30ch;
}
.footer-col{
  display:flex;
  flex-direction:column;
  min-width:0;
}
.footer-heading{
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:500;
  letter-spacing:.24em;
  color:var(--gold-500);
  margin-bottom:14px;
  padding-bottom:10px;
  border-bottom:1px solid rgba(201,164,92,.28);
}
.footer-list{display:grid;gap:9px}
.footer-link{
  display:inline-block;
  font-size:14px;
  color:var(--on-dark);
  border-bottom:1px solid transparent;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.footer-link:hover{
  color:var(--cyan);
  border-bottom-color:rgba(39,211,194,.6);
}
.footer-contact{gap:2px}
.footer-contact-item{
  display:grid;
  gap:3px;
  margin-bottom:13px;
}
.footer-contact-label{
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.22em;
  color:rgba(169,199,194,.85);
}
.footer-contact-value{
  font-size:13.5px;
  line-height:1.66;
  color:var(--on-dark);
  letter-spacing:.01em;
  overflow-wrap:anywhere;
}
.footer-contact-value--mono{
  font-family:var(--font-mono);
  letter-spacing:.04em;
  color:var(--gold-200);
}
.footer-bottom{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:14px;
  padding-block:20px 26px;
  font-size:12.5px;
}
.footer-legal{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px 18px;
}
.legal-link{
  font-size:12.5px;
  color:var(--on-dark-soft);
  border-bottom:1px solid transparent;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.legal-link:hover{
  color:var(--cyan);
  border-bottom-color:rgba(39,211,194,.6);
}
.footer-icp{
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.08em;
  color:rgba(169,199,194,.82);
}
.footer-copy{
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.08em;
  color:rgba(243,241,234,.5);
}

/* ---------- 8. 页面通用组件 ---------- */
.page-head{
  display:grid;
  gap:14px;
  margin-bottom:clamp(24px,3.4vw,44px);
  max-width:74ch;
}
.breadcrumbs{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  margin-bottom:clamp(16px,2.2vw,26px);
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.12em;
  color:var(--mist);
}
.crumb-link{
  color:var(--mist);
  border-bottom:1px solid transparent;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.crumb-link:hover{color:var(--ink-900);border-bottom-color:var(--cyan)}
.crumb-sep{color:rgba(111,127,122,.6)}
.crumb-now{color:var(--ink-900)}
.section{
  padding-block:clamp(26px,3.8vw,52px);
}
.section-head{
  display:grid;
  gap:8px;
  margin-bottom:clamp(18px,2.6vw,32px);
  padding-bottom:14px;
  border-bottom:1px solid var(--hairline);
}
.section-kicker{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.24em;
  color:var(--gold-500);
}
.section-title{
  font-family:var(--font-display);
  font-weight:600;
  font-size:clamp(20px,2.4vw,30px);
  line-height:1.3;
  letter-spacing:.03em;
  color:var(--char);
}
.section-note{
  font-size:13.5px;
  line-height:1.74;
  color:var(--mist);
  max-width:64ch;
}
.panel{
  background:var(--paper-soft);
  border:1px solid var(--hairline);
  padding:clamp(16px,2.2vw,28px);
  position:relative;
}
.panel::before{
  content:"";
  position:absolute;
  left:0;
  top:0;
  width:34px;
  height:2px;
  background:var(--gold-500);
}
.panel-head{
  display:flex;
  align-items:baseline;
  justify-content:space-between;
  gap:12px;
  padding-bottom:10px;
  margin-bottom:14px;
  border-bottom:1px solid var(--hairline);
}
.panel-title{
  font-family:var(--font-display);
  font-size:17px;
  letter-spacing:.04em;
  color:var(--ink-900);
}
.panel-body{font-size:14.5px;line-height:1.8;color:var(--body-ink)}
.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:3px 10px;
  border:1px solid var(--hairline-strong);
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.12em;
  color:var(--ink-700);
  background:transparent;
  white-space:nowrap;
}
.tag--gold{background:var(--gold-200);border-color:var(--gold-500);color:#4A3B18}
.tag--cyan{border-color:var(--cyan);color:#0B6C63}
.tag--red{border-color:var(--cinnabar);color:var(--cinnabar)}
.chip-group{display:flex;flex-wrap:wrap;gap:8px}
.chip{
  appearance:none;
  background:transparent;
  border:1px solid var(--hairline-strong);
  padding:7px 14px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.1em;
  color:var(--ink-700);
  border-radius:0;
  cursor:pointer;
  transition:background-color .2s var(--ease),border-color .2s var(--ease),color .2s var(--ease);
}
.chip:hover{
  border-color:var(--gold-500);
  background:rgba(201,164,92,.14);
  color:var(--ink-900);
}
.chip[aria-pressed="true"],
.chip[data-active="true"]{
  background:var(--ink-700);
  border-color:var(--ink-700);
  color:var(--paper);
}
.stat{
  display:flex;
  flex-direction:column;
  gap:4px;
  padding-left:12px;
  border-left:2px solid var(--gold-500);
}
.stat-value{
  font-family:var(--font-mono);
  font-size:clamp(22px,2.6vw,30px);
  line-height:1.1;
  color:var(--ink-900);
  font-variant-numeric:tabular-nums;
}
.stat-label{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.18em;
  color:var(--mist);
}
.data-table{
  width:100%;
  font-size:14px;
  border:1px solid var(--hairline);
}
.data-table th{
  background:var(--ink-700);
  color:var(--gold-200);
  font-family:var(--font-mono);
  font-size:11.5px;
  font-weight:500;
  letter-spacing:.14em;
  text-align:left;
  padding:10px 12px;
}
.data-table td{
  padding:11px 12px;
  border-bottom:1px solid var(--hairline);
  vertical-align:top;
  color:var(--body-ink);
}
.data-table tbody tr:hover{background:rgba(201,164,92,.08)}
.fold{
  border:1px solid var(--hairline);
  background:var(--paper-soft);
}
.fold + .fold{border-top:0}
.fold-summary{
  position:relative;
  cursor:pointer;
  list-style:none;
  padding:14px 44px 14px 16px;
  font-family:var(--font-display);
  font-size:15.5px;
  letter-spacing:.02em;
  color:var(--ink-900);
  transition:background-color .2s var(--ease);
}
.fold-summary::-webkit-details-marker{display:none}
.fold-summary::after{
  content:"+";
  position:absolute;
  right:16px;
  top:12px;
  font-family:var(--font-mono);
  font-size:16px;
  line-height:1.4;
  color:var(--gold-500);
}
.fold[open] .fold-summary::after{content:"\2212"}
.fold[open] .fold-summary{
  background:rgba(201,164,92,.1);
  border-bottom:1px solid var(--hairline);
}
.fold-body{
  padding:14px 16px 18px;
  font-size:14.5px;
  line-height:1.8;
  color:var(--body-ink);
}
.toc{
  border-top:1px solid var(--hairline);
  padding-top:12px;
}
.toc-title{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.24em;
  color:var(--gold-500);
  margin-bottom:12px;
}
.toc-list{
  display:grid;
  gap:2px;
  border-left:1px solid var(--hairline);
}
.toc-link{
  display:block;
  padding:7px 0 7px 14px;
  margin-left:-1px;
  border-left:2px solid transparent;
  font-size:13.5px;
  line-height:1.5;
  color:var(--mist);
  transition:color .2s var(--ease),border-color .2s var(--ease),background-color .2s var(--ease);
}
.toc-link:hover{
  color:var(--ink-900);
  border-left-color:var(--gold-500);
}
.toc-link[aria-current="true"]{
  color:var(--ink-900);
  border-left-color:var(--cyan);
  background:rgba(39,211,194,.1);
}
.img-frame{
  position:relative;
  display:block;
  overflow:hidden;
  background:var(--ink-700);
  border:1px solid var(--hairline);
}
.img-frame img{
  width:100%;
  height:100%;
  object-fit:cover;
  display:block;
}
.ratio-16x9{aspect-ratio:16/9}
.ratio-4x3{aspect-ratio:4/3}
.ratio-1x1{aspect-ratio:1/1}
.ratio-3x4{aspect-ratio:3/4}
.img-cap{
  margin-top:8px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.12em;
  color:var(--mist);
}

/* ---------- 9. 响应式 ---------- */
@media (max-width:1180px){
  .nav-link{padding:9px 8px;font-size:13px}
  .nav-link::after{left:8px;right:8px}
  .util-link{font-size:10.5px;letter-spacing:.12em;padding:5px 7px}
  .nav-cta{font-size:12px;padding:9px 14px}
}
@media (max-width:1080px){
  .nav-toggle{display:inline-flex}
  .brand-sub{display:none}
  .site-nav{
    position:absolute;
    left:0;
    right:0;
    top:100%;
    display:none;
    flex-direction:column;
    align-items:stretch;
    gap:0;
    padding:8px var(--gutter) 22px;
    background:var(--ink-900);
    border-top:1px solid var(--hairline-gold);
    border-bottom:1px solid var(--hairline-gold);
    box-shadow:0 18px 40px rgba(10,31,27,.45);
    max-height:calc(100vh - 96px);
    overflow-y:auto;
  }
  .site-nav[data-open]{display:flex}
  .nav-list{
    flex-direction:column;
    align-items:stretch;
    gap:0;
  }
  .nav-link{
    display:block;
    padding:14px 2px;
    font-size:15.5px;
    border-bottom:1px solid rgba(169,199,194,.14);
  }
  .nav-link::after{display:none}
  .nav-link[aria-current="page"]{
    color:var(--gold-200);
    padding-left:14px;
  }
  .nav-link[aria-current="page"]::before{
    content:"";
    position:absolute;
    left:0;
    top:50%;
    width:4px;
    height:16px;
    margin-top:-8px;
    background:var(--cyan);
  }
  .nav-utils{
    border-left:0;
    padding-left:0;
    margin-top:18px;
    flex-wrap:wrap;
    gap:10px;
  }
  .util-link{font-size:11.5px;padding:7px 11px}
  .nav-cta{margin-top:16px;align-self:flex-start}
  .header-inner{padding-block:12px}
  .brand-name{font-size:17.5px}
}
@media (max-width:1024px){
  .grid > [class*="span-"]{grid-column:span 12}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:720px){
  .rail-note{display:none}
  .rail-coord{letter-spacing:.12em;font-size:10px}
  .rail-status{font-size:10px;letter-spacing:.12em}
  .footer-grid{grid-template-columns:1fr;gap:30px}
  .footer-bottom{flex-direction:column;align-items:flex-start}
  .lede{font-size:15px}
}
@media (max-width:480px){
  .rail-status{display:none}
  .rail-inner{justify-content:flex-start}
  .brand-name{font-size:16px;letter-spacing:.1em}
  .brand-mark{width:26px;height:26px}
  .nav-toggle-label{display:none}
}
@media (min-width:1600px){
  :root{--shell:1360px}
}

/* ---------- 10. 无障碍与动效偏好 ---------- */
@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;
  }
  .scroll-progress-bar{transition:none}
}