/* ============================================================
   博电竞iOS · 共享样式表 /assets/site.css
   暗色赛博竞技场 + 技术蓝图网格 + 展览标签
   ============================================================ */

/* ---------- 变量 ---------- */
:root{
  --void:#05070D;
  --panel:#0E1626;
  --panel-2:#121C30;
  --grid:#1E2A44;
  --cyan:#22E0D6;
  --purple:#7C5CFF;
  --green:#B6FF3B;
  --paper:#F2E7D5;
  --steel:#8A97AD;
  --orange:#FF7A45;
  --white:#FFFFFF;
  --text:#D8E1EF;
  --rail-w:288px;
  --gutter:clamp(18px,2.6vw,44px);
  --radius:2px;
  --shadow-hard:6px 6px 0 rgba(5,7,13,.85);
  --ease:cubic-bezier(.22,.61,.36,1);
  --font-sans:"PingFang SC","Hiragino Sans GB","Source Han Sans SC","Noto Sans SC","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --font-mono:"JetBrains Mono","Roboto Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,"Courier New",monospace;
}

/* ---------- Reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
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{max-width:100%;display:block}
button,input,select,textarea{font:inherit;color:inherit}
a{color:inherit}
table{border-collapse:collapse;width:100%}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px}

/* ---------- 基础排版 ---------- */
html{scroll-behavior:smooth}
body{
  font-family:var(--font-sans);
  font-size:17px;
  line-height:1.75;
  color:var(--text);
  background-color:var(--void);
  background-image:
    linear-gradient(rgba(30,42,68,.34) 1px,transparent 1px),
    linear-gradient(90deg,rgba(30,42,68,.34) 1px,transparent 1px);
  background-size:48px 48px,48px 48px;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
h1,h2,h3,h4{color:var(--white);font-weight:900;line-height:1.16;letter-spacing:-.015em}
h1{font-size:clamp(38px,6vw,88px)}
h2{font-size:clamp(26px,3.6vw,44px)}
h3{font-size:clamp(20px,2vw,24px);letter-spacing:-.01em}
p{max-width:38em}
a{text-decoration:none}
strong{color:var(--white);font-weight:800}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.02em}
.rule{height:1px;background:var(--grid);border:0;margin:0}

/* ---------- 内容主区 ---------- */
#main-content{
  display:block;
  margin-left:var(--rail-w);
  min-height:60vh;
}
.page-shell{
  max-width:1440px;
  padding:clamp(28px,4vw,64px) var(--gutter) clamp(56px,7vw,104px);
}
[data-section]{scroll-margin-top:92px}
.prose{max-width:40rem}
.prose p + p{margin-top:1.1em}

/* ---------- 跳转链接 ---------- */
.skip-link{
  position:fixed;left:0;top:0;z-index:200;
  transform:translateY(-160%);
  background:var(--cyan);color:#04121A;
  padding:12px 18px;font-weight:800;font-size:14px;letter-spacing:.04em;
  border:2px solid #04121A;border-radius:var(--radius);
  transition:transform .18s var(--ease);
}
.skip-link:focus,.skip-link:focus-visible{transform:translateY(0)}

/* ---------- 阅读进度条 ---------- */
.progress-rail{
  position:fixed;top:0;left:0;right:0;height:3px;z-index:120;
  background:rgba(30,42,68,.65);
  pointer-events:none;
}
.progress-rail__bar{
  display:block;height:100%;width:100%;
  transform:scaleX(0);transform-origin:0 50%;
  background:linear-gradient(90deg,var(--cyan),var(--purple) 55%,var(--green));
  box-shadow:0 0 14px rgba(34,224,214,.55);
  transition:transform .12s linear;
}

/* ---------- 头部：左侧坐标轨 ---------- */
.site-header{
  position:fixed;top:0;left:0;bottom:0;z-index:90;
  width:var(--rail-w);
  display:flex;flex-direction:column;gap:26px;
  padding:30px 24px 26px;
  background:linear-gradient(180deg,#080D18 0%,#05070D 62%);
  border-right:1px solid var(--grid);
  overflow-y:auto;overscroll-behavior:contain;
}
.site-header::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:
    linear-gradient(rgba(30,42,68,.55) 1px,transparent 1px),
    linear-gradient(90deg,rgba(30,42,68,.55) 1px,transparent 1px);
  background-size:32px 32px;
  -webkit-mask-image:linear-gradient(180deg,rgba(0,0,0,.95),transparent 72%);
  mask-image:linear-gradient(180deg,rgba(0,0,0,.95),transparent 72%);
}
.site-header > *{position:relative;z-index:1}

/* 品牌坐标 */
.brand{
  display:flex;flex-direction:column;gap:10px;
  padding-bottom:20px;border-bottom:1px solid var(--grid);
}
.brand__coord{
  font-family:var(--font-mono);font-size:10.5px;letter-spacing:.2em;
  text-transform:uppercase;color:var(--steel);line-height:1.5;
}
.brand__mark{
  display:flex;align-items:baseline;gap:8px;
  font-size:30px;font-weight:900;letter-spacing:-.02em;line-height:1;
  color:var(--white);transition:color .2s var(--ease);
}
.brand__mark:hover{color:var(--cyan)}
.brand__unit{
  font-family:var(--font-mono);font-size:15px;font-weight:700;
  letter-spacing:.06em;color:var(--cyan);
}
.brand__meta{font-size:12.5px;line-height:1.6;color:var(--steel);max-width:26ch}
.brand__badge{
  align-self:flex-start;padding:5px 9px;
  border:1px solid rgba(182,255,59,.45);
  background:rgba(182,255,59,.08);
  color:var(--green);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;line-height:1.4;
}

/* 栏目导航 */
.site-nav{width:100%}
.site-nav__list{display:flex;flex-direction:column;gap:4px}
.site-nav__item{width:100%}
.site-nav__link{
  position:relative;display:flex;align-items:center;gap:12px;
  padding:11px 13px;border:1px solid transparent;
  color:var(--steel);font-size:16px;font-weight:700;letter-spacing:.02em;
  transition:color .2s var(--ease),background .2s var(--ease),border-color .2s var(--ease);
}
.site-nav__link::after{
  content:"";position:absolute;left:0;bottom:-1px;height:2px;width:0;
  background:var(--cyan);transition:width .24s var(--ease);
}
.site-nav__link:hover,.site-nav__link:focus-visible{
  color:var(--white);background:rgba(34,224,214,.07);border-color:var(--grid);
}
.site-nav__link:hover::after{width:58%}
.site-nav__link[aria-current="page"]{
  color:var(--white);
  border-color:rgba(34,224,214,.55);
  background:linear-gradient(90deg,rgba(34,224,214,.17),rgba(34,224,214,0) 88%);
}
.site-nav__link[aria-current="page"]::after{
  width:100%;background:linear-gradient(90deg,var(--cyan),var(--purple));
}
.site-nav__idx{
  font-family:var(--font-mono);font-size:11px;font-weight:700;
  letter-spacing:.06em;color:var(--cyan);
}
.site-nav__link[aria-current="page"] .site-nav__idx{color:var(--green)}

/* 本页章节索引 */
.rail-index{
  display:flex;flex-direction:column;gap:10px;
  padding-top:20px;border-top:1px solid var(--grid);
}
.rail-index[hidden]{display:none}
.rail-index__head{
  font-family:var(--font-mono);font-size:10.5px;letter-spacing:.24em;
  text-transform:uppercase;color:var(--steel);
}
.rail-index__list{display:flex;flex-direction:column;gap:2px}
.rail-index__item{width:100%}
.rail-index__link{
  display:flex;align-items:center;gap:10px;width:100%;
  padding:8px 10px;background:transparent;border:0;
  border-left:2px solid var(--grid);
  color:var(--steel);text-align:left;cursor:pointer;
  font-family:var(--font-sans);font-size:13.5px;font-weight:600;line-height:1.5;
  transition:color .2s var(--ease),border-color .2s var(--ease),background .2s var(--ease);
}
.rail-index__link:hover{color:var(--white);background:rgba(124,92,255,.12)}
.rail-index__link[data-active="true"]{
  color:var(--green);border-left-color:var(--green);background:rgba(182,255,59,.08);
}
.rail-index__idx{font-family:var(--font-mono);font-size:10.5px;opacity:.8}
.rail-index__label{flex:1 1 auto}

/* 轨道底部信息 */
.rail-meta{
  margin-top:auto;display:flex;flex-direction:column;gap:6px;
  padding-top:18px;border-top:1px solid var(--grid);
}
.rail-meta__cta{
  justify-content:center;padding:11px 12px;font-size:13px;margin-bottom:8px;
}
.rail-meta__item{
  font-family:var(--font-mono);font-size:11px;line-height:1.6;
  letter-spacing:.06em;color:rgba(138,151,173,.82);max-width:none;
}

/* 移动菜单按钮 */
.nav-toggle{
  display:none;align-items:center;gap:9px;
  padding:9px 13px;border:1px solid var(--grid);border-radius:var(--radius);
  background:rgba(14,22,38,.92);color:var(--white);
  font-size:13px;font-weight:700;letter-spacing:.1em;cursor:pointer;
  transition:border-color .2s var(--ease),color .2s var(--ease);
}
.nav-toggle:hover{border-color:var(--cyan);color:var(--cyan)}
.nav-toggle__text{font-family:var(--font-mono);font-size:11.5px}
.nav-toggle__bars{position:relative;display:block;width:18px;height:2px;background:var(--cyan)}
.nav-toggle__bars::before,.nav-toggle__bars::after{
  content:"";position:absolute;left:0;width:18px;height:2px;background:var(--cyan);
  transition:transform .22s var(--ease),opacity .22s var(--ease);
}
.nav-toggle__bars::before{top:-6px}
.nav-toggle__bars::after{top:6px}
.site-header[data-open] .nav-toggle__bars{background:transparent}
.site-header[data-open] .nav-toggle__bars::before{transform:translateY(6px) rotate(45deg)}
.site-header[data-open] .nav-toggle__bars::after{transform:translateY(-6px) rotate(-45deg)}

/* ---------- 页脚 ---------- */
.site-footer{
  position:relative;
  margin-left:var(--rail-w);
  border-top:1px solid var(--grid);
  background:linear-gradient(180deg,#070B14,#05070D 72%);
  padding:clamp(40px,5vw,72px) var(--gutter) 26px;
}
.site-footer::before{
  content:"";position:absolute;top:0;left:0;right:0;height:3px;
  background:linear-gradient(90deg,var(--cyan),var(--purple) 46%,var(--green));
}
.footer__grid{
  display:grid;
  grid-template-columns:1.7fr repeat(4,minmax(0,1fr));
  gap:34px 28px;
  max-width:1440px;margin:0 auto;
}
.footer__brand{display:flex;flex-direction:column;gap:12px;max-width:34ch}
.footer__coord{
  font-family:var(--font-mono);font-size:10.5px;letter-spacing:.22em;
  text-transform:uppercase;color:var(--steel);line-height:1.5;
}
.footer__mark{
  display:inline-flex;align-items:baseline;gap:7px;
  font-size:26px;font-weight:900;letter-spacing:-.02em;line-height:1;
  color:var(--white);transition:color .2s var(--ease);
}
.footer__mark:hover{color:var(--cyan)}
.footer__mark-unit{font-family:var(--font-mono);font-size:13px;color:var(--cyan);letter-spacing:.06em}
.footer__note{font-size:14px;line-height:1.7;color:var(--steel);max-width:34ch}
.footer__status{
  display:inline-flex;align-items:center;gap:8px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;color:var(--green);
}
.status-dot{
  width:8px;height:8px;border-radius:50%;background:var(--green);
  box-shadow:0 0 10px rgba(182,255,59,.85);
  animation:pulse 2.4s ease-in-out infinite;
}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.3}}
.footer__title{
  margin-bottom:14px;font-family:var(--font-mono);font-size:11px;
  font-weight:700;letter-spacing:.2em;text-transform:uppercase;color:var(--cyan);
}
.footer__list{display:flex;flex-direction:column;gap:9px}
.footer__link{
  position:relative;display:inline-block;font-size:14.5px;color:var(--steel);
  transition:color .2s var(--ease);
}
.footer__link::after{
  content:"";position:absolute;left:0;bottom:-2px;height:1px;width:0;
  background:var(--cyan);transition:width .22s var(--ease);
}
.footer__link:hover,.footer__link:focus-visible{color:var(--white)}
.footer__link:hover::after{width:100%}
.footer__contact{
  max-width:1440px;margin:clamp(30px,4vw,52px) auto 0;padding-top:24px;
  border-top:1px solid var(--grid);
  display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:12px 30px;
}
.footer__contact-line{
  display:flex;flex-wrap:wrap;align-items:baseline;gap:10px;
  font-size:14px;color:var(--text);max-width:none;
}
.footer__label{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;
  text-transform:uppercase;color:var(--steel);
}
.footer__bottom{
  max-width:1440px;margin:26px auto 0;padding-top:18px;
  border-top:1px solid var(--grid);
  display:flex;flex-wrap:wrap;justify-content:space-between;gap:10px;
}
.footer__bottom-line{
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.08em;
  color:var(--steel);max-width:none;
}

/* ---------- 通用按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;gap:10px;
  padding:13px 22px;border:2px solid var(--grid);border-radius:var(--radius);
  background:transparent;color:var(--white);
  font-family:var(--font-sans);font-size:15px;font-weight:700;letter-spacing:.04em;line-height:1;
  cursor:pointer;text-align:center;
  transition:border-color .2s var(--ease),color .2s var(--ease),background .2s var(--ease),box-shadow .2s var(--ease);
}
.btn:hover,.btn:focus-visible{
  border-color:var(--cyan);color:var(--cyan);
  box-shadow:0 0 0 1px rgba(34,224,214,.3),0 0 24px rgba(34,224,214,.2);
}
.btn--primary{background:var(--cyan);border-color:var(--cyan);color:#04121A}
.btn--primary:hover,.btn--primary:focus-visible{
  background:var(--green);border-color:var(--green);color:#0A1400;
  box-shadow:0 0 0 1px rgba(182,255,59,.35),0 0 26px rgba(182,255,59,.28);
}
.btn--ghost{border-color:rgba(124,92,255,.6);color:#CFC4FF}
.btn--ghost:hover,.btn--ghost:focus-visible{border-color:var(--purple);color:var(--white)}

/* ---------- 标签 ---------- */
.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 10px;border:1px solid var(--grid);border-radius:var(--radius);
  background:rgba(14,22,38,.72);
  font-family:var(--font-mono);font-size:12px;font-weight:600;letter-spacing:.08em;line-height:1.5;
  color:var(--steel);
}
.tag--cyan{color:var(--cyan);border-color:rgba(34,224,214,.5);background:rgba(34,224,214,.08)}
.tag--purple{color:#C3B4FF;border-color:rgba(124,92,255,.55);background:rgba(124,92,255,.1)}
.tag--green{color:var(--green);border-color:rgba(182,255,59,.5);background:rgba(182,255,59,.08)}
.tag--orange{color:var(--orange);border-color:rgba(255,122,69,.5);background:rgba(255,122,69,.09)}
.tag--paper{background:var(--paper);color:#14110C;border-color:var(--paper)}

/* ---------- 面包屑 ---------- */
.breadcrumb{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  margin-bottom:22px;
  font-family:var(--font-mono);font-size:11.5px;font-weight:600;
  letter-spacing:.14em;text-transform:uppercase;color:var(--steel);
}
.breadcrumb__item{display:inline-flex;align-items:center;gap:8px}
.breadcrumb__item::after{content:"/";color:var(--grid)}
.breadcrumb__item:last-child::after{content:""}
.breadcrumb a{color:var(--steel);transition:color .2s var(--ease)}
.breadcrumb a:hover{color:var(--cyan)}
.breadcrumb [aria-current="page"]{color:var(--cyan)}

/* ---------- 章节骨架 ---------- */
.section-block{
  padding:clamp(44px,5.5vw,92px) 0;
  border-top:1px solid var(--grid);
}
.section-block:first-of-type{border-top:0;padding-top:clamp(24px,3vw,48px)}
.section-head{
  display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;
  gap:16px 32px;margin-bottom:clamp(22px,3vw,38px);
}
.eyebrow{
  display:block;margin-bottom:12px;
  font-family:var(--font-mono);font-size:11px;font-weight:700;
  letter-spacing:.3em;text-transform:uppercase;color:var(--cyan);
}
.section-title{font-size:clamp(26px,3.6vw,44px)}
.lede{
  font-size:clamp(16.5px,1.6vw,20px);line-height:1.75;
  color:var(--text);max-width:40ch;
}

/* ---------- 12 列蓝图网格 ---------- */
.grid-12{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:24px}
.col-3{grid-column:span 3}
.col-4{grid-column:span 4}
.col-5{grid-column:span 5}
.col-6{grid-column:span 6}
.col-7{grid-column:span 7}
.col-8{grid-column:span 8}
.col-9{grid-column:span 9}
.col-12{grid-column:span 12}

/* ---------- 图像容器 ---------- */
.media-frame{
  position:relative;overflow:hidden;isolation:isolate;
  aspect-ratio:16 / 9;
  border:1px solid var(--grid);border-radius:var(--radius);
  background:
    linear-gradient(135deg,rgba(18,28,48,.95),rgba(5,7,13,.98) 72%),
    var(--panel);
}
.media-frame--wide{aspect-ratio:21 / 9}
.media-frame--square{aspect-ratio:1 / 1}
.media-frame--tall{aspect-ratio:3 / 4}
.media-frame > img{
  width:100%;height:100%;object-fit:cover;
  filter:contrast(1.08) saturate(1.12);
}
.media-frame::after{
  content:"";position:absolute;inset:0;pointer-events:none;z-index:2;
  background:repeating-linear-gradient(0deg,rgba(5,7,13,.3) 0 1px,transparent 1px 4px);
}
.media-frame--plain::after{display:none}
.media-frame__slot{
  position:absolute;inset:0;display:grid;place-items:center;padding:16px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.24em;
  text-transform:uppercase;color:rgba(138,151,173,.62);text-align:center;
}
.media-frame__label{
  position:absolute;left:0;bottom:0;z-index:3;
  padding:8px 12px;background:var(--paper);color:#14110C;
  font-family:var(--font-mono);font-size:11.5px;font-weight:700;letter-spacing:.1em;
}

/* ---------- 展签 ---------- */
.plate{
  padding:18px 20px;
  background:var(--paper);color:#14110C;
  border:2px solid #14110C;border-radius:var(--radius);
  box-shadow:var(--shadow-hard);
  font-size:15px;line-height:1.7;
}
.plate__title{display:block;font-size:17px;font-weight:900;letter-spacing:-.01em;color:#14110C}
.plate__meta{
  display:block;margin-top:6px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:#544A3C;
}

/* ---------- 数据读数 ---------- */
.stat{
  display:flex;flex-direction:column;gap:6px;
  padding:14px 16px;
  border-left:2px solid var(--cyan);
  background:rgba(14,22,38,.72);
}
.stat__value{
  font-family:var(--font-mono);font-size:clamp(24px,3vw,34px);font-weight:700;
  line-height:1;letter-spacing:-.02em;color:var(--white);
}
.stat__value--green{color:var(--green)}
.stat__label{
  font-family:var(--font-mono);font-size:11px;font-weight:600;
  letter-spacing:.16em;text-transform:uppercase;color:var(--steel);
}

/* ---------- 入场上浮 ---------- */
[data-reveal]{
  opacity:0;transform:translateY(12px);
  transition:opacity .32s var(--ease),transform .32s var(--ease);
}
[data-reveal].is-visible{opacity:1;transform:none}

/* ---------- 平板：轨道收窄为图标轨 ---------- */
@media (min-width:1024px) and (max-width:1439px){
  :root{--rail-w:104px}
  .progress-rail{left:var(--rail-w)}
  #main-content{margin-left:var(--rail-w)}
  .site-footer{margin-left:var(--rail-w)}
  .site-header{padding:24px 12px;align-items:center;gap:18px}
  .brand{width:100%;align-items:center;text-align:center;gap:8px}
  .brand__coord,.brand__meta,.brand__badge{display:none}
  .brand__mark{flex-direction:column;align-items:center;gap:3px;font-size:17px}
  .brand__unit{font-size:10.5px}
  .site-nav{width:100%}
  .site-nav__list{align-items:center;gap:6px}
  .site-nav__link{justify-content:center;padding:12px 4px;font-size:13px}
  .site-nav__label{
    position:absolute;width:1px;height:1px;margin:-1px;padding:0;overflow:hidden;
    clip-path:inset(50%);white-space:nowrap;border:0;
  }
  .site-nav__idx{font-size:13px}
  .rail-index__head,.rail-index__idx{display:none}
  .rail-index__link{justify-content:center;padding:8px 4px;font-size:11px;border-left-width:2px}
  .rail-meta{width:100%;align-items:center;gap:4px}
  .rail-meta__item{display:none}
  .rail-meta__cta{width:100%;padding:9px 4px;font-size:11px;letter-spacing:.02em;margin-bottom:0}
}

/* ---------- 手机 / 小屏平板：顶栏 + 抽屉 ---------- */
@media (max-width:1023px){
  html{scroll-behavior:auto}
  .progress-rail{left:0}
  #main-content{margin-left:0}
  .site-footer{margin-left:0}
  .site-header{
    position:sticky;top:0;bottom:auto;left:auto;
    width:100%;height:auto;
    flex-direction:row;flex-wrap:wrap;align-items:center;justify-content:space-between;
    gap:12px;padding:12px 16px;
    border-right:0;border-bottom:1px solid var(--grid);
    overflow:visible;
  }
  .site-header::before{display:none}
  .brand{flex-direction:row;align-items:center;gap:10px;padding:0;border-bottom:0}
  .brand__coord,.brand__meta,.brand__badge{display:none}
  .brand__mark{font-size:21px;gap:6px}
  .brand__unit{font-size:12px}
  .nav-toggle{display:inline-flex}
  .site-nav{
    position:absolute;top:100%;left:0;right:0;z-index:95;
    max-height:72vh;overflow-y:auto;
    padding:12px 16px 20px;
    background:linear-gradient(180deg,#0A1120,#05070D);
    border-bottom:2px solid var(--cyan);
    opacity:0;visibility:hidden;transform:translateY(-10px);
    transition:opacity .22s var(--ease),transform .22s var(--ease),visibility .22s var(--ease);
  }
  .site-header[data-open] .site-nav{opacity:1;visibility:visible;transform:none}
  .site-nav__list{gap:2px}
  .site-nav__link{padding:13px 12px;font-size:16px}
  .rail-index{display:none}
  .rail-meta{
    width:100%;flex-direction:row;flex-wrap:wrap;align-items:center;gap:10px;
    margin-top:0;padding-top:0;border-top:0;
  }
  .site-header:not([data-open]) .rail-meta{display:none}
  .rail-meta__cta{margin-bottom:0}
  body.is-nav-open{overflow:hidden}
  .footer__grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:28px 20px}
  .footer__brand{grid-column:1 / -1;max-width:none}
}

@media (max-width:640px){
  body{font-size:16.5px;background-size:32px 32px,32px 32px}
  .footer__grid{grid-template-columns:1fr}
  .footer__contact{grid-template-columns:1fr}
  .footer__bottom{flex-direction:column}
  .btn{width:100%;justify-content:center}
  .rail-meta__cta{width:auto}
}

@media (max-width:420px){
  .brand__meta{display:none}
  .nav-toggle__text{display:none}
}

/* ---------- 降低动效 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .status-dot{animation:none}
  [data-reveal]{opacity:1;transform:none}
}