/* ============================================================
   百家家乐站 · 共享样式 /assets/site.css
   纵向叙事长卷 · 侧边轨道导航 · 近单色蓝 + 单点亮橙
   ============================================================ */

/* ---------- 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,li,figure,blockquote,dl,dd{margin:0;padding:0}
ul,ol{list-style:none}
img,svg,video{display:block;max-width:100%;height:auto}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
button{background:none;border:0;cursor:pointer}
[hidden]{display:none!important}

/* ---------- 2. 变量 ---------- */
:root{
  --ink:#0B1B33;
  --ink-2:#14294A;
  --scroll:#1F3B66;
  --route:#2E5A8F;
  --mist:#E8EEF7;
  --paper:#F5F8FC;
  --amber:#F0871F;
  --amber-hi:#FF9A32;
  --amber-ink:#8A3E06;
  --coral:#FF6B4A;
  --teal:#12A594;
  --slate:#64748B;
  --mist-dim:rgba(232,238,247,.62);
  --mist-soft:rgba(232,238,247,.08);
  --line:rgba(11,27,51,.10);
  --line-strong:rgba(11,27,51,.18);
  --rail-w:96px;
  --rail-w-open:238px;
  --topbar-h:64px;
  --max:1200px;
  --r-s:2px;
  --r-m:4px;
  --r-l:6px;
  --shadow:0 1px 0 rgba(11,27,51,.03),0 16px 34px -26px rgba(11,27,51,.55);
  --ease:cubic-bezier(.22,.61,.36,1);
  --display:"Helvetica Neue",Helvetica,Arial,"PingFang SC","Source Han Sans SC","Microsoft YaHei",system-ui,sans-serif;
  --body:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Source Han Sans SC","Microsoft YaHei",sans-serif;
  --mono:"SFMono-Regular",Menlo,Consolas,"Roboto Mono","Noto Sans Mono CJK SC",monospace;
}

/* ---------- 3. 基础排版 ---------- */
body{
  background:var(--paper);
  color:var(--ink);
  font-family:var(--body);
  font-size:17px;
  line-height:1.8;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
  padding-left:0;
  padding-top:var(--topbar-h);
}
h1,h2,h3,h4{font-family:var(--display);font-weight:800;letter-spacing:-.02em;color:var(--ink)}
h1{font-size:clamp(30px,4.4vw,40px);line-height:1.18}
h2{font-size:clamp(23px,2.8vw,28px);line-height:1.28}
h3{font-size:20px;line-height:1.4;letter-spacing:-.01em}
h4{font-size:16px;line-height:1.5;letter-spacing:0}
p{font-size:17px;line-height:1.8}
strong{font-weight:700;color:var(--scroll)}
a{transition:color .2s var(--ease)}
::selection{background:rgba(240,135,31,.28)}
:focus-visible{outline:2px solid var(--amber);outline-offset:3px;border-radius:var(--r-s)}
.visually-hidden{position:absolute!important;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}

/* ---------- 4. 布局与正文容器 ---------- */
.container{width:min(100% - 2.5rem,var(--max));margin-inline:auto}
.prose{max-width:68ch}
.prose p+p{margin-top:1.05em}
.prose ul,.prose ol{margin:1.1em 0;display:flex;flex-direction:column;gap:.5em}
.prose ul li{position:relative;padding-left:1.5em}
.prose ul li::before{content:"";position:absolute;left:.2em;top:.85em;width:6px;height:6px;border-radius:50%;background:var(--route)}
.lede{font-size:19px;line-height:1.75;color:var(--scroll);max-width:56ch}
.eyebrow{display:inline-block;font-family:var(--mono);font-size:12px;letter-spacing:.18em;text-transform:uppercase;color:var(--slate)}
.divider{height:1px;background:var(--line);border:0;margin:40px 0}
.grid{display:grid;gap:24px}
.grid--2{grid-template-columns:minmax(0,1fr)}
.grid--3{grid-template-columns:minmax(0,1fr)}

/* ---------- 5. skip link ---------- */
.skip-link{
  position:fixed;top:12px;left:12px;z-index:200;
  transform:translateY(-260%);
  background:var(--amber);color:var(--amber-ink);
  font-family:var(--display);font-weight:800;font-size:14px;
  padding:11px 18px;border-radius:var(--r-m);
  box-shadow:0 10px 24px -14px rgba(11,27,51,.9);
  transition:transform .18s var(--ease);
}
.skip-link:focus{transform:translateY(0)}

/* ---------- 6. 头部：侧边轨道 ---------- */
.site-header{position:relative;z-index:60}

.rail{
  position:fixed;top:0;left:0;bottom:0;z-index:70;
  width:var(--rail-w);
  display:flex;flex-direction:column;align-items:center;gap:8px;
  padding:18px 0 16px;
  background:var(--ink);
  color:var(--mist);
  border-right:1px solid rgba(232,238,247,.12);
  overflow-x:hidden;overflow-y:auto;
  overscroll-behavior:contain;
  transition:width .32s var(--ease),box-shadow .32s var(--ease);
}

.rail-brand{
  display:flex;align-items:center;gap:12px;
  width:100%;padding:0 18px 16px;
  border-bottom:1px solid rgba(232,238,247,.14);
}
.brand-mark{
  flex:0 0 auto;width:40px;height:40px;
  display:grid;place-items:center;
  border-radius:var(--r-m);
  background:var(--amber);color:var(--amber-ink);
  font-family:var(--display);font-weight:800;font-size:20px;
  box-shadow:inset 0 0 0 1px rgba(138,62,6,.28);
}
.brand-text{
  display:flex;flex-direction:column;min-width:0;width:0;overflow:hidden;
  opacity:0;transform:translateX(-8px);
  transition:opacity .22s var(--ease),transform .26s var(--ease);
}
.brand-name{font-family:var(--display);font-weight:800;font-size:16px;letter-spacing:.02em;color:#fff;white-space:nowrap}
.brand-sub{font-family:var(--mono);font-size:11px;letter-spacing:.08em;color:var(--mist-dim);white-space:nowrap}

.nav-toggle{
  display:none;align-items:center;gap:9px;
  padding:9px 13px;margin-left:auto;
  border:1px solid rgba(232,238,247,.26);border-radius:var(--r-m);
  color:var(--mist);font-family:var(--display);font-weight:800;font-size:13px;letter-spacing:.04em;
  transition:border-color .2s var(--ease),color .2s var(--ease);
}
.nav-toggle:hover{border-color:var(--amber);color:#fff}
.nav-toggle-bars{position:relative;flex:0 0 auto;width:18px;height:12px}
.nav-toggle-bars::before,.nav-toggle-bars::after{
  content:"";position:absolute;left:0;right:0;height:2px;border-radius:2px;background:currentColor;
  transition:transform .24s var(--ease);
}
.nav-toggle-bars::before{top:0}
.nav-toggle-bars::after{bottom:0}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::before{transform:translateY(5px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after{transform:translateY(-5px) rotate(-45deg)}

.site-nav{display:flex;flex-direction:column;flex:1 1 auto;min-height:0;width:100%;padding:12px 0 0}
.nav-list{display:flex;flex-direction:column;gap:2px;padding:0 8px}
.nav-item{display:flex}
.nav-link{
  position:relative;width:100%;
  display:flex;flex-direction:column;align-items:center;gap:6px;
  padding:12px 6px;border-radius:var(--r-m);
  color:rgba(232,238,247,.78);
  transition:color .2s var(--ease),background .2s var(--ease);
}
.nav-link::before{
  content:"";position:absolute;left:-8px;top:50%;
  width:3px;height:0;background:var(--amber);border-radius:2px;
  transform:translateY(-50%);
  transition:height .26s var(--ease);
}
.nav-link:hover{color:#fff;background:var(--mist-soft)}
.nav-num{font-family:var(--mono);font-size:11px;letter-spacing:.1em;color:var(--route);font-variant-numeric:tabular-nums}
.nav-label{writing-mode:vertical-rl;text-orientation:upright;font-family:var(--display);font-weight:800;font-size:13px;letter-spacing:.14em}
.nav-desc{display:none;font-size:12px;line-height:1.5;color:var(--mist-dim);white-space:nowrap}
.nav-link[aria-current="page"]{color:#fff;background:rgba(46,90,143,.36)}
.nav-link[aria-current="page"]::before{height:62%}
.nav-link[aria-current="page"] .nav-num{color:var(--amber)}

.rail-foot{margin-top:auto;width:100%;padding:16px 8px 0;border-top:1px solid rgba(232,238,247,.14)}
.rail-help{
  display:flex;flex-direction:column;align-items:center;gap:7px;
  padding:12px 8px;border-radius:var(--r-m);
  background:rgba(240,135,31,.14);
  border:1px solid rgba(240,135,31,.42);
  color:#FFD9AE;
  transition:background .2s var(--ease),color .2s var(--ease);
}
.rail-help:hover{background:rgba(240,135,31,.26);color:#fff}
.rail-help-mark{
  flex:0 0 auto;display:grid;place-items:center;
  width:20px;height:20px;border-radius:50%;
  background:var(--amber);color:var(--amber-ink);
  font-family:var(--mono);font-weight:700;font-size:12px;
}
.rail-help-label{font-family:var(--display);font-weight:800;font-size:12px;letter-spacing:.14em;writing-mode:vertical-rl;text-orientation:upright}

.rail-progress{
  position:fixed;left:var(--rail-w);top:0;z-index:66;
  width:2px;height:100vh;
  background:rgba(46,90,143,.16);
  pointer-events:none;
}
.rail-thumb{
  display:block;width:100%;height:100%;
  background:var(--amber);
  transform:scaleY(0);transform-origin:top center;
  transition:transform .12s linear;
}

/* ---------- 7. 头部：右上控制台与右下常驻按钮 ---------- */
.hud{
  position:fixed;top:18px;right:26px;z-index:50;
  display:flex;align-items:center;gap:10px;
  padding:8px 10px;
  background:var(--paper);
  border:1px solid var(--line);
  border-radius:var(--r-m);
  box-shadow:var(--shadow);
  opacity:0;transform:translateY(-8px);pointer-events:none;
  transition:opacity .26s var(--ease),transform .26s var(--ease);
}
body[data-scrolled="true"] .hud{opacity:1;transform:none;pointer-events:auto}
.crumbs{display:flex;align-items:center;gap:8px;font-family:var(--mono);font-size:13px;color:var(--slate)}
.crumbs a{color:var(--scroll)}
.crumbs a:hover{color:var(--amber-ink)}
.crumbs-sep{color:var(--slate)}
.crumbs-current{color:var(--ink);font-weight:700}
.version-chips{display:flex;gap:3px;padding:3px;background:var(--mist);border-radius:var(--r-m)}
.chip{
  padding:4px 11px;border-radius:var(--r-s);
  font-family:var(--mono);font-size:12px;color:var(--slate);
  transition:background .2s var(--ease),color .2s var(--ease);
}
.chip:hover{color:var(--ink)}
.chip.is-active{background:var(--ink);color:#fff}

.dock{position:fixed;right:20px;bottom:20px;z-index:55;display:flex;flex-direction:column;gap:8px}
.dock-btn{
  width:46px;height:46px;
  display:grid;place-items:center;
  border:1px solid var(--line-strong);border-radius:var(--r-m);
  background:var(--paper);color:var(--scroll);
  font-family:var(--display);font-weight:800;font-size:12px;letter-spacing:.04em;
  box-shadow:var(--shadow);
  transition:border-color .2s var(--ease),color .2s var(--ease),transform .2s var(--ease);
}
.dock-btn:hover{border-color:var(--amber);color:var(--amber-ink);transform:translateY(-2px)}
.dock-btn--help{background:var(--ink);color:#fff;border-color:var(--ink)}
.dock-btn--help:hover{background:var(--scroll);color:#fff;border-color:var(--scroll)}
.dock-btn--top{font-size:16px;font-family:var(--body)}

/* ---------- 8. 页脚 ---------- */
.site-footer{
  position:relative;
  margin-top:96px;
  padding:72px 0 26px;
  background:var(--ink);
  color:rgba(232,238,247,.78);
}
.site-footer::before{
  content:"";position:absolute;inset:0 0 auto;height:4px;
  background:linear-gradient(90deg,var(--scroll) 0%,var(--route) 52%,var(--amber) 100%);
}
.foot-inner{
  width:min(100% - 2.5rem,var(--max));margin-inline:auto;
  display:grid;grid-template-columns:minmax(0,1fr);gap:40px;
}
.foot-col{min-width:0}
.foot-title{
  font-family:var(--mono);font-size:12px;font-weight:700;letter-spacing:.18em;
  text-transform:uppercase;color:#fff;
}
.foot-title::after{content:"";display:block;width:26px;height:2px;background:var(--amber);margin-top:9px}
.foot-list{display:flex;flex-direction:column;gap:11px;margin-top:18px}
.foot-list a{
  position:relative;display:inline-flex;align-items:center;gap:9px;
  font-size:14.5px;color:rgba(232,238,247,.84);
  transition:color .2s var(--ease),transform .2s var(--ease);
}
.foot-list a::before{content:"";flex:0 0 auto;width:5px;height:5px;border-radius:50%;background:rgba(232,238,247,.34);transition:background .2s var(--ease)}
.foot-list a:hover{color:#fff;transform:translateX(3px)}
.foot-list a:hover::before{background:var(--amber)}
.foot-note{margin-top:18px;font-size:13px;line-height:1.7;color:var(--mist-dim);max-width:34ch}
.foot-meta{display:flex;flex-direction:column;gap:13px;margin-top:18px;font-size:14.5px}
.meta-row{display:flex;gap:12px;align-items:flex-start}
.meta-label{
  flex:0 0 auto;min-width:44px;padding-top:4px;
  font-family:var(--mono);font-size:11px;letter-spacing:.12em;color:var(--amber);
}
.meta-value{color:rgba(232,238,247,.86);overflow-wrap:anywhere}
.foot-cta{margin-top:24px}
.foot-base{
  width:min(100% - 2.5rem,var(--max));margin:48px auto 0;padding-top:20px;
  border-top:1px solid rgba(232,238,247,.14);
  display:flex;flex-wrap:wrap;gap:12px 22px;align-items:center;justify-content:space-between;
  font-family:var(--mono);font-size:12.5px;color:var(--mist-dim);
}
.foot-copy{font-family:var(--mono);font-size:12.5px}
.foot-legal{display:flex;flex-wrap:wrap;gap:18px}
.foot-legal a{color:rgba(232,238,247,.82);transition:color .2s var(--ease)}
.foot-legal a:hover{color:var(--amber)}
.foot-status{display:inline-flex;align-items:center;font-family:var(--mono);font-size:12.5px}
.foot-status::before{
  content:"";flex:0 0 auto;width:7px;height:7px;margin-right:9px;border-radius:50%;
  background:var(--teal);box-shadow:0 0 0 3px rgba(18,165,148,.22);
}

/* ---------- 9. 通用组件 ---------- */
.section-band{display:flex;align-items:center;gap:14px;margin-bottom:26px}
.section-band::before{content:"";flex:0 0 auto;width:4px;height:46px;border-radius:2px;background:var(--scroll)}
.section-num{
  font-family:var(--mono);font-size:12px;letter-spacing:.16em;
  color:var(--amber);font-variant-numeric:tabular-nums;
}

.card{
  position:relative;
  padding:28px 24px 26px;
  background:var(--paper);
  border:1px solid var(--line);
  border-radius:var(--r-l);
  box-shadow:var(--shadow);
  transition:border-color .24s var(--ease),transform .24s var(--ease);
}
.card:hover{border-color:rgba(46,90,143,.34);transform:translateY(-3px)}
.card-num{display:block;font-family:var(--mono);font-size:12px;letter-spacing:.14em;color:var(--amber);margin-bottom:12px}
.card-title{font-family:var(--display);font-weight:800;font-size:19px;line-height:1.4;letter-spacing:-.01em;margin-bottom:10px}
.card p{font-size:15.5px;line-height:1.75;color:var(--slate)}

.btn{
  display:inline-flex;align-items:center;gap:10px;
  padding:13px 22px;border:1px solid transparent;border-radius:var(--r-m);
  font-family:var(--display);font-weight:800;font-size:15px;letter-spacing:.01em;
  transition:background .22s var(--ease),color .22s var(--ease),border-color .22s var(--ease),transform .22s var(--ease);
}
.btn:hover{transform:translateY(-2px)}
.btn--amber{background:var(--amber);color:var(--amber-ink)}
.btn--amber:hover{background:var(--amber-hi)}
.btn--ghost{background:transparent;color:var(--ink);border-color:var(--line-strong)}
.btn--ghost:hover{border-color:var(--route);color:var(--route)}
.btn--sm{padding:10px 17px;font-size:14px}

.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 10px;border-radius:var(--r-s);
  font-family:var(--mono);font-size:11px;letter-spacing:.06em;
  background:var(--mist);color:var(--scroll);border:1px solid var(--line);
}
.tag--amber{background:rgba(240,135,31,.16);color:var(--amber-ink);border-color:rgba(240,135,31,.46)}
.tag--coral{background:rgba(255,107,74,.14);color:#B23A1E;border-color:rgba(255,107,74,.42)}
.tag--teal{background:rgba(18,165,148,.14);color:#0B7C70;border-color:rgba(18,165,148,.42)}

.float-label{
  position:absolute;top:-12px;left:20px;
  padding:4px 11px;border-radius:var(--r-s);
  background:var(--amber);color:var(--amber-ink);
  font-family:var(--mono);font-size:11px;letter-spacing:.08em;
  box-shadow:0 8px 18px -12px rgba(138,62,6,.9);
}

.route-link{
  display:inline-flex;align-items:center;gap:8px;
  font-family:var(--display);font-weight:800;font-size:15px;color:var(--route);
}
.route-link::after{content:"→";font-size:14px;transition:transform .22s var(--ease)}
.route-link:hover{color:var(--amber-ink)}
.route-link:hover::after{transform:translateX(4px)}

.note{
  position:relative;
  padding:18px 20px 18px 22px;
  background:var(--mist);
  border-radius:var(--r-l);
  font-size:15px;line-height:1.75;color:var(--scroll);
}
.note::before{content:"";position:absolute;left:0;top:14px;bottom:14px;width:3px;border-radius:2px;background:var(--teal)}
.note--warn::before{background:var(--coral)}

.aside{
  padding:20px 20px 22px;
  border:1px solid var(--line);
  border-left:3px solid var(--route);
  border-radius:var(--r-m);
  background:rgba(232,238,247,.42);
}
.aside h3{font-size:15px;margin-bottom:8px}
.aside p,.aside li{font-size:14px;line-height:1.75;color:var(--slate)}

.step-list{display:flex;flex-direction:column;gap:14px;counter-reset:step}
.step{position:relative;display:flex;gap:14px;align-items:flex-start}
.step-num{
  flex:0 0 auto;width:30px;height:30px;display:grid;place-items:center;
  border-radius:var(--r-m);background:var(--ink);color:#fff;
  font-family:var(--mono);font-size:12px;font-variant-numeric:tabular-nums;
}
.step-body{font-size:15.5px;line-height:1.75;color:var(--scroll)}
.step-body strong{display:block;font-family:var(--display);color:var(--ink);margin-bottom:2px}

.stat{display:flex;flex-direction:column;gap:4px;padding:18px 0;border-top:1px solid var(--line)}
.stat-value{font-family:var(--mono);font-size:26px;font-weight:700;color:var(--ink);font-variant-numeric:tabular-nums;line-height:1.2}
.stat-label{font-size:13px;color:var(--slate)}

.media-frame{
  position:relative;overflow:hidden;
  border:1px solid var(--line);border-radius:var(--r-l);
  background:var(--mist);box-shadow:var(--shadow);
}
.media-frame img,.media-frame svg,.media-frame picture>*{display:block;width:100%;height:100%;object-fit:cover}
.media-frame--16x9{aspect-ratio:16/9}
.media-frame--4x3{aspect-ratio:4/3}
.media-frame--1x1{aspect-ratio:1/1}
.media-frame--tall{aspect-ratio:3/4}
.media-frame--plain{background:linear-gradient(158deg,var(--ink) 0%,var(--scroll) 62%,var(--route) 100%)}
.media-frame--plain::after{
  content:"";position:absolute;inset:0;
  background-image:radial-gradient(rgba(232,238,247,.16) 1px,transparent 1px);
  background-size:14px 14px;opacity:.55;pointer-events:none;
}
.media-caption{margin-top:10px;font-family:var(--mono);font-size:12px;letter-spacing:.04em;color:var(--slate)}

/* ---------- 10. 显现动效 ---------- */
html[data-js="on"] [data-reveal]{opacity:0;transform:translateY(8px)}
html[data-js="on"] [data-reveal].is-in{
  opacity:1;transform:none;
  transition:opacity .32s var(--ease),transform .32s var(--ease);
}

/* ---------- 11. 平板及以上 ---------- */
@media (min-width:760px){
  body{padding-top:0}
  .grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
  .grid--3{grid-template-columns:repeat(2,minmax(0,1fr))}
  .foot-inner{grid-template-columns:repeat(3,minmax(0,1fr));gap:34px}
  .foot-list--two{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:11px 16px}
}

/* ---------- 12. 桌面：轨道常驻并可展开 ---------- */
@media (min-width:1024px){
  body{padding-left:var(--rail-w)}
  .container{width:min(100% - 4rem,var(--max))}
  .grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
  .grid--asym{display:grid;grid-template-columns:minmax(0,7fr) minmax(0,4fr);gap:52px;align-items:start}

  .rail:hover,.rail:focus-within{width:var(--rail-w-open);box-shadow:18px 0 44px -34px rgba(11,27,51,.95)}
  .rail:hover .brand-text,.rail:focus-within .brand-text{width:auto;opacity:1;transform:none}
  .rail:hover .nav-link,.rail:focus-within .nav-link{flex-direction:row;align-items:center;gap:12px;padding:11px 14px}
  .rail:hover .nav-label,.rail:focus-within .nav-label{writing-mode:horizontal-tb;text-orientation:mixed;letter-spacing:.02em;font-size:14.5px}
  .rail:hover .nav-desc,.rail:focus-within .nav-desc{display:block;margin-left:auto}
  .rail:hover .rail-help,.rail:focus-within .rail-help{flex-direction:row;justify-content:flex-start;padding:12px 14px}
  .rail:hover .rail-help-label,.rail:focus-within .rail-help-label{writing-mode:horizontal-tb;letter-spacing:.06em}
}

/* ---------- 13. 移动端：顶栏 + 抽屉 ---------- */
@media (max-width:1023px){
  .rail{
    left:0;right:0;top:0;bottom:auto;
    width:100%;height:var(--topbar-h);
    flex-direction:row;align-items:center;gap:12px;
    padding:0 16px;overflow:visible;
    box-shadow:0 10px 26px -22px rgba(11,27,51,.9);
  }
  .rail-brand{width:auto;padding:0;border-bottom:0}
  .brand-text{width:auto;opacity:1;transform:none}
  .brand-mark{width:36px;height:36px;font-size:18px}
  .nav-toggle{display:inline-flex}
  .site-nav{
    position:fixed;top:var(--topbar-h);left:0;bottom:0;z-index:75;
    width:min(320px,86vw);
    padding:18px 10px 26px;
    background:var(--ink-2);
    box-shadow:22px 0 48px -30px rgba(11,27,51,.95);
    transform:translateX(-104%);
    transition:transform .3s var(--ease);
    overflow-y:auto;
  }
  .site-nav[data-open]{transform:none}
  .nav-list{padding:0 6px}
  .nav-link{flex-direction:row;align-items:center;gap:12px;padding:14px 13px}
  .nav-num{font-size:12px}
  .nav-label{writing-mode:horizontal-tb;text-orientation:mixed;letter-spacing:.02em;font-size:15px}
  .nav-desc{display:block;margin-left:auto;font-size:12px}
  .rail-foot{padding:16px 6px 0}
  .rail-help{flex-direction:row;justify-content:flex-start;gap:10px;padding:13px 14px}
  .rail-help-label{writing-mode:horizontal-tb;letter-spacing:.06em}
  .rail-progress{display:none}
  .hud{display:none}
  body[data-nav-open="true"]{overflow:hidden}
}

/* ---------- 14. 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;
  }
  html[data-js="on"] [data-reveal]{opacity:1;transform:none}
  .btn:hover,.card:hover,.dock-btn:hover,.foot-list a:hover{transform:none}
}