/* ============================================================
   十博电竞局 · 共享站点套件 /assets/site.css
   赛博战术室 + 赛后复盘台
   ============================================================ */

/* ---------- 1. Reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,h5,p,figure,blockquote,dl,dd,ul,ol{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,video{display:block;max-width:100%}
img{height:auto}
button{font:inherit;color:inherit}
a{color:inherit;text-decoration:none}
table{border-collapse:collapse;width:100%}

/* ---------- 2. 变量 ---------- */
:root{
  --night:#070B16;
  --panel:#111827;
  --panel-deep:#0B1120;
  --paper:#E8DFC8;
  --ink:#151A23;
  --cyan:#39F4E0;
  --violet:#9B7BFF;
  --orange:#FF7A1A;
  --green:#6EE7A8;
  --steel:#A7B0C0;
  --grid:#26324A;
  --text:#DCE2ED;
  --accent:var(--cyan);
  --accent-2:var(--violet);
  --mono:ui-monospace,"JetBrains Mono","IBM Plex Mono",SFMono-Regular,Menlo,Consolas,monospace;
  --sans:"Noto Sans SC","HarmonyOS Sans SC","PingFang SC","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --max:1440px;
  --gutter:clamp(16px,3vw,32px);
  --radius:3px;
  --line:1px solid var(--grid);
}
:root[data-platform="ios"]{
  --accent:var(--violet);
  --accent-2:var(--cyan);
}

/* ---------- 3. 基础排版 ---------- */
body{
  font-family:var(--sans);
  font-size:16px;
  line-height:1.7;
  letter-spacing:.01em;
  color:var(--text);
  background-color:var(--night);
  background-image:
    radial-gradient(1100px 560px at 12% -8%,rgba(57,244,224,.10),transparent 62%),
    radial-gradient(900px 520px at 92% -4%,rgba(155,123,255,.13),transparent 60%);
  background-repeat:no-repeat;
  background-attachment:fixed;
  min-height:100vh;
}
h1,h2,h3,h4{line-height:1.2;letter-spacing:-.01em;color:var(--paper);text-wrap:balance}
h1{font-size:clamp(30px,4.4vw,54px);font-weight:800}
h2{font-size:clamp(24px,3vw,36px);font-weight:800}
h3{font-size:clamp(19px,2.2vw,24px);font-weight:700}
h4{font-size:clamp(16px,1.8vw,18px);font-weight:700}
p{text-wrap:pretty}
a{color:var(--cyan);transition:color .18s ease,border-color .18s ease,background-color .18s ease}
a:hover{color:var(--accent)}
::selection{background:var(--cyan);color:var(--night)}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:2px}
.mono,.mono-num{font-family:var(--mono);font-variant-numeric:tabular-nums}
.mono-num{font-size:.92em;letter-spacing:.04em;color:var(--cyan)}
.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--mono);font-size:11.5px;letter-spacing:.22em;
  text-transform:uppercase;color:var(--cyan);margin:0 0 14px;
}
.eyebrow::before{content:"";width:26px;height:1px;background:currentColor;opacity:.7}
.rule{border:0;height:1px;background:var(--grid);margin:clamp(24px,4vw,40px) 0}

/* ---------- 4. Skip link ---------- */
.skip-link{
  position:absolute;left:16px;top:-80px;z-index:999;
  display:inline-block;padding:11px 20px;
  background:var(--cyan);color:var(--night);
  font-family:var(--mono);font-size:13px;font-weight:700;letter-spacing:.1em;
  border-radius:var(--radius);
  transition:top .18s ease;
}
.skip-link:focus,.skip-link:focus-visible{top:14px;color:var(--night)}

/* ---------- 5. 页头 ---------- */
.site-header{
  position:relative;z-index:100;
  background:linear-gradient(180deg,#0A1020 0%,#070B16 100%);
  border-bottom:1px solid var(--grid);
}

/* 5.1 顶部细轨 */
.header-rail{background:rgba(17,24,39,.72);border-bottom:1px solid rgba(38,50,74,.75)}
.rail-inner{
  max-width:var(--max);margin:0 auto;
  padding:9px var(--gutter);
  display:flex;flex-wrap:wrap;justify-content:space-between;gap:6px 24px;
}
.rail-meta{
  display:flex;align-items:center;gap:8px;margin:0;
  font-family:var(--mono);font-size:11px;letter-spacing:.12em;
  color:var(--steel);text-transform:uppercase;
}
.rail-dot{
  width:7px;height:7px;border-radius:50%;background:var(--cyan);
  box-shadow:0 0 0 3px rgba(57,244,224,.16),0 0 12px rgba(57,244,224,.7);
  animation:rail-pulse 2.6s ease-in-out infinite;
}
@keyframes rail-pulse{0%,100%{opacity:1}50%{opacity:.45}}

/* 5.2 刊头 */
.masthead{position:relative;padding:clamp(16px,2.6vw,28px) 0 clamp(14px,2vw,22px)}
.masthead::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:repeating-linear-gradient(90deg,rgba(38,50,74,.55) 0 1px,transparent 1px 96px);
  opacity:.5;
  -webkit-mask-image:linear-gradient(90deg,transparent,#000 12%,#000 88%,transparent);
  mask-image:linear-gradient(90deg,transparent,#000 12%,#000 88%,transparent);
}
.masthead-inner{
  position:relative;
  max-width:var(--max);margin:0 auto;padding:0 var(--gutter);
  display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:18px;
}

/* 5.3 品牌字标 */
.brand{display:flex;align-items:center;gap:14px;justify-self:center;color:var(--paper)}
.brand:hover{color:var(--paper)}
.brand-mark{
  display:grid;place-items:center;
  width:clamp(38px,4vw,50px);height:clamp(38px,4vw,50px);
  border:1px solid rgba(57,244,224,.55);
  background:rgba(57,244,224,.07);
  color:var(--cyan);
  font-size:clamp(20px,2.2vw,26px);font-weight:800;line-height:1;
  border-radius:2px;
  box-shadow:inset 0 0 18px rgba(57,244,224,.18);
}
.brand-text{display:block}
.brand-name{
  display:block;color:var(--paper);
  font-size:clamp(20px,2.6vw,30px);font-weight:800;line-height:1.05;
  letter-spacing:.1em;
}
.brand-sub{
  display:block;margin-top:7px;
  font-family:var(--mono);font-size:10px;letter-spacing:.26em;
  color:var(--steel);
}

/* 5.4 刊头两侧 */
.masthead-side{display:flex;flex-direction:column;gap:10px;min-width:0}
.masthead-side--left{justify-self:start;align-items:flex-start}
.masthead-side--right{justify-self:end;align-items:flex-end}
.masthead-tag{
  margin:0;display:inline-block;
  padding:4px 9px;border:1px solid rgba(155,123,255,.5);border-radius:2px;
  background:rgba(155,123,255,.08);
  font-family:var(--mono);font-size:10.5px;letter-spacing:.16em;
  color:var(--violet);white-space:nowrap;
}
.masthead-note{margin:0;font-size:12.5px;color:var(--steel);letter-spacing:.02em}

/* 5.5 双端色标切换 */
.platform-switch{
  display:inline-flex;border:1px solid var(--grid);border-radius:2px;
  overflow:hidden;background:rgba(7,11,22,.7);
}
.platform-chip{
  appearance:none;border:0;background:transparent;cursor:pointer;
  padding:8px 13px;color:var(--steel);
  font-family:var(--mono);font-size:11.5px;letter-spacing:.14em;font-weight:600;
  transition:color .18s ease,background-color .18s ease;
}
.platform-chip + .platform-chip{border-left:1px solid var(--grid)}
.platform-chip:hover{color:var(--paper);background:rgba(38,50,74,.55)}
.platform-chip[data-platform="pc"].is-active{background:var(--cyan);color:var(--night)}
.platform-chip[data-platform="ios"].is-active{background:var(--violet);color:var(--night)}

/* 5.6 导航 */
.site-nav{
  background:rgba(17,24,39,.6);
  border-top:1px solid var(--grid);
  border-bottom:1px solid var(--grid);
}
.nav-inner{
  position:relative;
  max-width:var(--max);margin:0 auto;padding:0 var(--gutter);
  display:flex;align-items:center;justify-content:center;gap:24px;
}
.nav-list{
  display:flex;flex-wrap:wrap;justify-content:center;
  margin:0;padding:0;list-style:none;counter-reset:navi;
}
.nav-link{
  position:relative;display:block;
  padding:14px clamp(12px,1.6vw,20px);
  font-size:14.5px;color:var(--text);
  box-shadow:inset 0 -2px 0 transparent;
  transition:color .18s ease,background-color .18s ease,box-shadow .18s ease;
}
.nav-link::before{
  counter-increment:navi;
  content:counter(navi,decimal-leading-zero);
  margin-right:8px;
  font-family:var(--mono);font-size:10px;letter-spacing:.08em;
  color:var(--steel);opacity:.75;
}
.nav-link:hover{color:var(--cyan);background:rgba(57,244,224,.07);box-shadow:inset 0 -2px 0 rgba(57,244,224,.5)}
.nav-link:hover::before{color:var(--cyan);opacity:1}
.nav-link[aria-current="page"]{
  color:var(--cyan);background:rgba(57,244,224,.09);
  box-shadow:inset 0 -2px 0 var(--cyan);
}
.nav-link[aria-current="page"]::before{color:var(--cyan);opacity:1}
.nav-foot{
  display:none;margin:0;
  font-family:var(--mono);font-size:10.5px;letter-spacing:.18em;
  color:rgba(167,176,192,.6);
}

/* 5.7 移动导航按钮 */
.nav-toggle{
  display:none;align-items:center;gap:10px;justify-self:end;
  padding:9px 12px;cursor:pointer;
  background:rgba(17,24,39,.85);border:1px solid var(--grid);border-radius:2px;
  color:var(--paper);
  font-family:var(--mono);font-size:11.5px;letter-spacing:.16em;
  transition:color .18s ease,border-color .18s ease,background-color .18s ease;
}
.nav-toggle:hover,.nav-toggle:focus-visible{border-color:rgba(57,244,224,.55);color:var(--cyan)}
.nav-toggle.is-open{color:var(--cyan);border-color:var(--cyan);background:rgba(57,244,224,.1)}
.nav-toggle-bar{
  display:block;width:18px;height:2px;background:currentColor;
  box-shadow:0 -6px 0 currentColor,0 6px 0 currentColor;
}
.nav-toggle-label{white-space:nowrap}

/* 5.8 滚动进度 */
.scroll-progress{
  position:fixed;top:0;left:0;z-index:130;
  width:100%;height:2px;pointer-events:none;
  transform:scaleX(0);transform-origin:0 50%;
  background:linear-gradient(90deg,var(--cyan),var(--violet) 55%,var(--orange));
  transition:transform .12s linear;
}

/* ---------- 6. 页脚 ---------- */
.site-footer{
  position:relative;margin-top:clamp(48px,7vw,96px);
  background:linear-gradient(180deg,#0A0F1B 0%,#070B16 100%);
  border-top:1px solid var(--grid);
}
.site-footer::before{
  content:"";position:absolute;left:0;right:0;top:0;height:2px;
  background:linear-gradient(90deg,var(--cyan),var(--violet) 45%,var(--orange));
  opacity:.85;
}
.footer-inner{
  max-width:var(--max);margin:0 auto;
  padding:clamp(36px,5vw,64px) var(--gutter) 26px;
}
.footer-top{
  display:grid;grid-template-columns:1.4fr .8fr 1fr;
  gap:clamp(24px,4vw,56px);
}
.footer-logo{
  margin:0;color:var(--paper);
  font-size:clamp(23px,3vw,32px);font-weight:800;letter-spacing:.1em;line-height:1.1;
}
.footer-line{margin:12px 0 0;font-size:13.5px;color:var(--steel)}
.footer-mono{
  margin:16px 0 0;
  font-family:var(--mono);font-size:10.5px;letter-spacing:.26em;
  color:rgba(167,176,192,.55);
}
.footer-heading{
  margin:0 0 16px;padding-bottom:11px;
  border-bottom:1px solid var(--grid);
  font-family:var(--mono);font-size:10.5px;letter-spacing:.24em;
  text-transform:uppercase;color:var(--cyan);
}
.footer-nav ul,.footer-contact ul{display:grid;gap:10px}
.footer-nav a{
  position:relative;display:inline-block;
  font-size:14px;color:var(--text);
  transition:color .18s ease,transform .18s ease;
}
.footer-nav a::before{
  content:"";display:inline-block;
  width:0;height:1px;background:var(--cyan);
  vertical-align:middle;margin-right:0;
  transition:width .18s ease,margin-right .18s ease;
}
.footer-nav a:hover{color:var(--cyan)}
.footer-nav a:hover::before{width:14px;margin-right:8px}
.contact-line{font-size:13.5px;line-height:1.6;color:var(--text);word-break:break-word}
.contact-meta{font-size:12.5px;line-height:1.6;color:var(--steel)}
.footer-legal{
  margin-top:clamp(28px,4vw,48px);padding-top:18px;
  border-top:1px solid var(--grid);
  display:flex;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:12px 24px;
  font-family:var(--mono);font-size:11.5px;letter-spacing:.06em;
  color:rgba(167,176,192,.85);
}
.legal-links{display:flex;flex-wrap:wrap;align-items:center;gap:10px}
.legal-links a{color:var(--text);border-bottom:1px solid transparent}
.legal-links a:hover{color:var(--cyan);border-bottom-color:rgba(57,244,224,.5)}
.dot-sep{color:var(--grid)}
.legal-copy{margin:0;color:rgba(167,176,192,.75)}

/* ---------- 7. 布局容器 ---------- */
.container{max-width:var(--max);margin:0 auto;padding-inline:var(--gutter);width:100%}
.section{padding-block:clamp(40px,6vw,80px)}
.section-head{
  display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;
  gap:16px 32px;margin-bottom:clamp(20px,3vw,34px);
  padding-bottom:16px;border-bottom:1px solid var(--grid);
}
.section-title{margin:0;font-size:clamp(22px,2.8vw,32px)}
.section-note{margin:0;max-width:52ch;font-size:14px;color:var(--steel)}
.grid{display:grid;gap:clamp(16px,2vw,24px)}
.grid--12{grid-template-columns:repeat(12,minmax(0,1fr))}
.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-12{grid-column:span 12}
.split{display:grid;grid-template-columns:minmax(0,4fr) minmax(0,8fr);gap:clamp(16px,2.4vw,32px);align-items:start}

/* ---------- 8. 按钮 ---------- */
.btn-row{display:flex;flex-wrap:wrap;gap:12px}
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:11px 18px;border:1px solid transparent;border-radius:2px;
  font-family:var(--mono);font-size:12.5px;font-weight:600;letter-spacing:.1em;
  cursor:pointer;
  transition:background-color .18s ease,color .18s ease,border-color .18s ease,transform .18s ease;
}
.btn--primary{background:var(--accent);color:var(--night);border-color:var(--accent)}
.btn--primary:hover{background:var(--cyan);border-color:var(--cyan);color:var(--night);transform:translateY(-1px)}
.btn--ghost{background:transparent;color:var(--accent);border-color:rgba(57,244,224,.45)}
.btn--ghost:hover{background:rgba(57,244,224,.1);border-color:var(--accent);color:var(--accent);transform:translateY(-1px)}
.btn--paper{background:var(--paper);color:var(--ink);border-color:var(--paper)}
.btn--paper:hover{background:#F3ECDA;border-color:#F3ECDA;color:var(--ink)}
.btn--sm{padding:7px 12px;font-size:11.5px;letter-spacing:.08em}

/* ---------- 9. 块与标签 ---------- */
.panel{
  background:var(--panel);border:1px solid var(--grid);border-radius:var(--radius);
  padding:clamp(18px,2.4vw,28px);
}
.card{
  position:relative;
  background:linear-gradient(180deg,rgba(17,24,39,.95),rgba(11,17,32,.95));
  border:1px solid var(--grid);border-radius:var(--radius);
  padding:clamp(18px,2.4vw,26px);
  transition:border-color .2s ease,transform .2s ease,box-shadow .2s ease;
}
.card:hover{border-color:rgba(57,244,224,.42);transform:translateY(-2px);box-shadow:0 18px 40px rgba(0,0,0,.35)}
.paper-card{
  background:var(--paper);color:var(--ink);
  border:1px solid rgba(21,26,35,.16);border-radius:var(--radius);
  padding:clamp(18px,2.4vw,28px);
  box-shadow:0 20px 44px rgba(0,0,0,.4);
}
.paper-card h2,.paper-card h3,.paper-card h4{color:var(--ink)}
.paper-card p{color:#3A4150}
.paper-card a{color:#0B6E63;border-bottom:1px solid rgba(11,110,99,.4)}
.paper-card a:hover{color:#074A43;border-bottom-color:#074A43}
.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:3px 8px;border:1px solid currentColor;border-radius:2px;
  font-family:var(--mono);font-size:10.5px;letter-spacing:.12em;line-height:1.6;
}
.tag--cyan{color:var(--cyan);background:rgba(57,244,224,.09)}
.tag--violet{color:var(--violet);background:rgba(155,123,255,.1)}
.tag--orange{color:var(--orange);background:rgba(255,122,26,.1)}
.tag--green{color:var(--green);background:rgba(110,231,168,.1)}

/* ---------- 10. 正文 ---------- */
.prose{max-width:74ch;font-size:17px;line-height:1.8;color:var(--text)}
.prose > * + *{margin-top:1.05em}
.prose h2{margin:1.9em 0 .55em;font-size:clamp(22px,2.6vw,30px);letter-spacing:-.01em}
.prose h3{margin:1.6em 0 .5em;font-size:clamp(18px,2vw,22px);color:var(--paper)}
.prose p{margin:0 0 1.05em}
.prose a{color:var(--cyan);border-bottom:1px solid rgba(57,244,224,.35)}
.prose a:hover{color:var(--paper);border-bottom-color:var(--paper)}
.prose ul,.prose ol{padding-left:1.4em;margin:0 0 1.2em;display:grid;gap:.45em;list-style:disc}
.prose ol{list-style:decimal}
.prose li::marker{color:var(--cyan)}
.prose strong{color:var(--paper);font-weight:700}
.prose code{
  font-family:var(--mono);font-size:.88em;
  padding:.14em .42em;border-radius:2px;
  background:rgba(57,244,224,.1);color:var(--cyan);
}
.prose blockquote{
  margin:1.4em 0;padding:2px 0 2px 16px;
  border-left:2px solid var(--violet);color:var(--steel);
}
.prose hr{margin:2.2em 0}

/* ---------- 11. 面包屑 ---------- */
.breadcrumb{margin:0 0 clamp(18px,3vw,28px)}
.breadcrumb ol{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  font-family:var(--mono);font-size:11.5px;letter-spacing:.08em;color:var(--steel);
}
.breadcrumb li{display:flex;align-items:center;gap:8px}
.breadcrumb li + li::before{content:"/";color:var(--grid)}
.breadcrumb a{color:var(--text)}
.breadcrumb a:hover{color:var(--cyan)}
.breadcrumb [aria-current="page"]{color:var(--cyan)}

/* ---------- 12. 数据表 ---------- */
.table-wrap{
  width:100%;overflow-x:auto;
  border:1px solid var(--grid);border-radius:var(--radius);
  background:rgba(11,17,32,.7);
}
.data-table{font-size:14px;min-width:520px}
.data-table caption{
  padding:12px 14px;text-align:left;
  font-family:var(--mono);font-size:11px;letter-spacing:.16em;
  color:var(--steel);border-bottom:1px solid var(--grid);
}
.data-table th{
  padding:10px 14px;text-align:left;white-space:nowrap;
  font-family:var(--mono);font-size:11px;font-weight:600;letter-spacing:.12em;
  color:var(--steel);background:rgba(38,50,74,.4);
  border-bottom:1px solid var(--grid);
}
.data-table td{
  padding:11px 14px;color:var(--text);
  border-bottom:1px solid rgba(38,50,74,.6);
  line-height:1.5;
}
.data-table tbody tr:hover td{background:rgba(57,244,224,.05)}
.data-table tbody tr:last-child td{border-bottom:0}
.data-table .num{font-family:var(--mono);font-variant-numeric:tabular-nums;color:var(--cyan)}

/* ---------- 13. 图像容器基础 ---------- */
.media-frame{
  position:relative;display:block;overflow:hidden;
  aspect-ratio:16 / 9;
  border:1px solid var(--grid);border-radius:var(--radius);
  background:
    linear-gradient(135deg,rgba(57,244,224,.08),transparent 55%),
    repeating-linear-gradient(0deg,rgba(38,50,74,.55) 0 1px,transparent 1px 28px),
    var(--panel-deep);
}
.media-frame img,.media-frame svg{width:100%;height:100%;object-fit:cover;display:block}
.media-frame::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:linear-gradient(180deg,rgba(57,244,224,.1),transparent 42%);
  opacity:.55;
}
.media-frame--pip{
  position:absolute;right:clamp(12px,2vw,22px);bottom:clamp(12px,2vw,22px);
  width:min(40%,260px);aspect-ratio:4 / 3;
  border-color:rgba(57,244,224,.55);
  box-shadow:0 18px 40px rgba(0,0,0,.6);
  z-index:2;
}
.media-frame--paper{border-color:rgba(21,26,35,.22);background:rgba(21,26,35,.08)}
.media-strip{
  display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));
  gap:clamp(12px,1.8vw,18px);
}
.media-strip .media-frame{aspect-ratio:4 / 3}
.media-caption{
  margin:8px 0 0;
  font-family:var(--mono);font-size:11.5px;letter-spacing:.06em;color:var(--steel);
}
.media-caption::before{content:"— ";color:var(--grid)}

/* ---------- 14. 响应式 ---------- */
@media (min-width:1240px){
  .nav-foot{display:block;position:absolute;right:var(--gutter);top:50%;transform:translateY(-50%)}
}

@media (max-width:1000px){
  .nav-toggle{display:inline-flex}
  .masthead-inner{
    grid-template-columns:1fr auto;
    grid-template-areas:"brand toggle" "tools tools";
    row-gap:16px;
  }
  .brand{grid-area:brand;justify-self:start}
  .nav-toggle{grid-area:toggle}
  .masthead-side--left{display:none}
  .masthead-side--right{
    grid-area:tools;
    flex-direction:row;align-items:center;justify-content:space-between;
    justify-self:stretch;width:100%;flex-wrap:wrap;gap:12px;
  }
  .site-nav{display:none}
  .site-nav[data-open="true"]{
    display:block;
    background:rgba(9,13,24,.98);
    border-bottom:1px solid rgba(57,244,224,.28);
  }
  .nav-inner{flex-direction:column;align-items:stretch;gap:0;padding-block:6px}
  .nav-list{flex-direction:column;align-items:stretch;width:100%}
  .nav-link{
    padding:13px 4px;
    border-bottom:1px dashed rgba(38,50,74,.85);
    box-shadow:none;
  }
  .nav-link:hover,.nav-link[aria-current="page"]{
    background:rgba(57,244,224,.07);
    box-shadow:inset 3px 0 0 var(--cyan);
    padding-left:12px;
  }
  .nav-foot{
    display:block;margin:0;padding:14px 0 16px;
    text-align:center;border-top:1px solid var(--grid);
  }
  .split{grid-template-columns:minmax(0,1fr)}
  .footer-top{grid-template-columns:1fr 1fr}
  .footer-brand{grid-column:1 / -1}
}

@media (max-width:760px){
  .grid--12{grid-template-columns:repeat(6,minmax(0,1fr))}
  .col-4,.col-5,.col-6,.col-7,.col-8{grid-column:span 6}
  .section-head{flex-direction:column;align-items:flex-start}
  .footer-top{grid-template-columns:1fr;gap:28px}
  .footer-legal{flex-direction:column;align-items:flex-start}
  .rail-inner{justify-content:flex-start}
  .prose{font-size:16px}
}

@media (max-width:520px){
  .brand-sub{letter-spacing:.16em;font-size:9px}
  .brand-name{letter-spacing:.06em}
  .platform-chip{padding:7px 10px;font-size:11px;letter-spacing:.1em}
  .btn--sm{padding:6px 10px}
  .masthead-side--right{gap:10px}
  .legal-links{gap:8px;font-size:11px}
}

/* ---------- 15. 动效降级 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .rail-dot{animation:none}
  .scroll-progress{transition:none}
  .card:hover,.btn:hover{transform:none}
}