/* ============================================================
   EMC 全站中文专区 · 共享外壳样式  /assets/site.css
   未来终端控制台：深灰紫黑底 + 品牌蓝 + 荧光青 + 暖橙
   ============================================================ */

/* ---------- 01 变量 ---------- */
:root{
  --ink-900:#0B1030;
  --ink-800:#161B3F;
  --ink-700:#232B5C;
  --ink-600:#2E3768;
  --brand:#1B4DFF;
  --brand-soft:#5C86FF;
  --cyan:#00E5C0;
  --amber:#FF8A3D;
  --paper:#F5F7FF;
  --mist:#C3CBE8;
  --steel:#7885B5;

  --bg:var(--ink-900);
  --surface:var(--ink-800);
  --line:var(--ink-700);
  --text:var(--paper);
  --text-2:var(--mist);
  --text-3:var(--steel);

  --font-display:"Barlow Condensed","Oswald","Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
  --font-body:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;

  --fs-12:0.75rem;
  --fs-14:0.875rem;
  --fs-16:1rem;
  --fs-20:1.25rem;
  --fs-28:1.75rem;
  --fs-44:2.75rem;
  --fs-72:4.5rem;
  --fs-120:7.5rem;

  --shell-w:1440px;
  --gutter:64px;
  --header-h:76px;
  --ease:cubic-bezier(0.22,1,0.36,1);
  --shadow-paper:6px 6px 0 rgba(35,43,92,.55);
  --shadow-paper-hover:6px 9px 0 rgba(0,229,192,.18);
}

/* ---------- 02 Reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:calc(var(--header-h) + 16px);
}
body{
  margin:0;
  min-height:100vh;
  background:var(--ink-900);
  color:var(--text);
  font-family:var(--font-body);
  font-size:var(--fs-16);
  line-height:1.75;
  letter-spacing:.01em;
  display:flex;
  flex-direction:column;
  overflow-x:hidden;
}
body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:0;
  pointer-events:none;
  opacity:.5;
  background-image:
    repeating-linear-gradient(0deg,rgba(35,43,92,.5) 0 1px,transparent 1px 72px),
    repeating-linear-gradient(90deg,rgba(35,43,92,.42) 0 1px,transparent 1px 72px);
}
img,svg{display:block;max-width:100%;height:auto}
button{font:inherit;color:inherit}
h1,h2,h3,h4,p,figure,blockquote{margin:0}
ul,ol{padding-left:1.15em}
a{color:var(--brand-soft)}
a:hover{color:var(--cyan)}
:focus-visible{outline:2px solid var(--cyan);outline-offset:2px;border-radius:2px}

/* ---------- 03 通用排版 ---------- */
.mono{font-family:var(--font-mono);letter-spacing:.04em}
.u-visually-hidden{
  position:absolute!important;width:1px;height:1px;padding:0;margin:-1px;
  overflow:hidden;clip:rect(0 0 0 0);clip-path:inset(50%);white-space:nowrap;border:0;
}
.eyebrow{
  font-family:var(--font-mono);
  font-size:var(--fs-12);
  letter-spacing:.22em;
  text-transform:uppercase;
  color:var(--cyan);
  margin:0 0 16px;
}
.display-title{
  font-family:var(--font-display);
  font-weight:700;
  font-size:clamp(2.4rem,5.6vw,var(--fs-72));
  line-height:1.04;
  letter-spacing:-.02em;
  color:var(--text);
  margin:0;
}
.display-title--xl{font-size:clamp(3rem,9vw,var(--fs-120));line-height:0.94}
.lede{
  font-size:var(--fs-20);
  line-height:1.6;
  color:var(--text-2);
  max-width:34em;
  margin:20px 0 0;
}
.prose{max-width:68ch;color:var(--text-2)}
.prose p{margin:0 0 1.15em}
.prose h2,.prose h3{color:var(--text);margin:1.8em 0 .6em;line-height:1.25}
.prose h2{font-size:var(--fs-28);font-weight:700}
.prose h3{font-size:var(--fs-20);font-weight:600}
.prose ul,.prose ol{margin:0 0 1.2em}
.prose strong{color:var(--text)}
.badge-num{
  font-family:var(--font-display);
  font-weight:700;
  font-size:var(--fs-44);
  line-height:1;
  letter-spacing:-.02em;
  color:var(--cyan);
}
.status-dot{
  display:inline-block;
  width:8px;height:8px;
  border-radius:50%;
  background:var(--cyan);
  box-shadow:0 0 0 3px rgba(0,229,192,.18);
  flex:none;
}
.rule{height:1px;background:var(--line);border:0;margin:0}

/* ---------- 04 布局容器 ---------- */
.shell{
  width:100%;
  max-width:var(--shell-w);
  margin:0 auto;
  padding-left:var(--gutter);
  padding-right:var(--gutter);
}
.site-main{
  position:relative;
  z-index:1;
  padding-top:var(--header-h);
  flex:1 0 auto;
}
.section{position:relative;z-index:1;padding:96px 0}
.section--tight{padding:64px 0}
.section--wide{padding:140px 0}
.section--paper{
  --text:#101538;
  --text-2:#39426E;
  --text-3:#5D6795;
  --surface:#FFFFFF;
  --line:#D7DCF3;
  background:var(--paper);
  color:var(--text);
  border-top:2px solid var(--brand);
}
.section--paper .display-title,.section--paper .prose h2,.section--paper .prose h3{color:var(--text)}
.section--paper .lede,.section--paper .prose{color:var(--text-2)}
.grid-12{
  display:grid;
  grid-template-columns:repeat(12,minmax(0,1fr));
  gap:24px;
}
.layout-split{
  display:grid;
  grid-template-columns:minmax(0,8fr) minmax(0,4fr);
  gap:48px;
  align-items:start;
}
.layout-split--reverse{grid-template-columns:minmax(0,4fr) minmax(0,8fr)}
.panel-sticky{
  position:sticky;
  top:calc(var(--header-h) + 24px);
}

/* ---------- 05 头部 ---------- */
.site-header{
  position:fixed;
  top:0;left:0;right:0;
  z-index:100;
  background:rgba(11,16,48,.86);
  border-bottom:1px solid var(--line);
  -webkit-backdrop-filter:blur(14px);
  backdrop-filter:blur(14px);
  transition:background .24s var(--ease),border-color .24s var(--ease);
}
.site-header[data-scrolled]{
  background:rgba(11,16,48,.97);
  border-bottom-color:rgba(0,229,192,.4);
}
.site-header__inner{
  display:flex;
  align-items:center;
  gap:24px;
  height:var(--header-h);
  transition:height .24s var(--ease);
}
.site-header[data-scrolled] .site-header__inner{height:64px}

.skip-link{
  position:absolute;
  top:8px;left:var(--gutter);
  z-index:200;
  transform:translateY(-200%);
  background:var(--cyan);
  color:var(--ink-900);
  padding:10px 18px;
  font-size:var(--fs-14);
  font-weight:700;
  text-decoration:none;
  transition:transform .18s var(--ease);
}
.skip-link:focus{transform:translateY(0);color:var(--ink-900)}

/* 品牌 */
.brand{
  display:flex;
  align-items:center;
  gap:14px;
  min-width:0;
  text-decoration:none;
  color:var(--text);
  flex:none;
}
.brand__mark{
  position:relative;
  flex:none;
  width:34px;height:34px;
  background:linear-gradient(140deg,var(--brand) 0%,var(--brand-soft) 46%,var(--cyan) 100%);
  border:1px solid rgba(245,247,255,.4);
  box-shadow:4px 4px 0 rgba(35,43,92,.95);
}
.brand__mark::after{
  content:"";
  position:absolute;
  inset:7px;
  border:1px solid rgba(11,16,48,.7);
}
.brand__text{display:flex;flex-direction:column;line-height:1.15;min-width:0}
.brand__name{
  font-family:var(--font-display);
  font-weight:700;
  font-size:var(--fs-20);
  letter-spacing:.02em;
  text-transform:uppercase;
  color:var(--text);
  white-space:nowrap;
}
.brand__meta{
  font-size:11px;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--text-3);
  white-space:nowrap;
}
.brand__version{
  font-size:var(--fs-12);
  padding:2px 9px;
  border:1px solid rgba(0,229,192,.5);
  background:rgba(0,229,192,.08);
  color:var(--cyan);
  border-radius:999px;
  flex:none;
}
.brand--footer .brand__name{font-size:var(--fs-20)}
.brand--footer:hover .brand__name{color:var(--cyan)}

/* 移动导航按钮 */
.nav-toggle{
  display:none;
  align-items:center;
  gap:10px;
  padding:10px 14px;
  background:rgba(22,27,63,.8);
  border:1px solid var(--line);
  color:var(--text);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.16em;
  text-transform:uppercase;
  cursor:pointer;
  transition:border-color .18s var(--ease),background .18s var(--ease);
}
.nav-toggle:hover{border-color:var(--cyan)}
.nav-toggle__bars{display:inline-flex;flex-direction:column;gap:4px;width:18px}
.nav-toggle__bars i{
  display:block;height:1.5px;background:var(--cyan);
  transition:transform .2s var(--ease),opacity .2s var(--ease);
}
.nav-toggle[aria-expanded="true"]{border-color:var(--cyan);background:rgba(27,77,255,.22)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(1){transform:translateY(5.5px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(3){transform:translateY(-5.5px) rotate(-45deg)}

/* 主导航 */
.site-nav{
  display:flex;
  align-items:center;
  gap:28px;
  margin-left:auto;
  min-width:0;
}
.site-nav__list{
  display:flex;
  align-items:center;
  gap:2px;
  margin:0;
  padding:0;
  list-style:none;
}
.site-nav__link{
  position:relative;
  display:inline-flex;
  align-items:baseline;
  gap:6px;
  padding:12px;
  font-size:var(--fs-14);
  color:var(--text-2);
  text-decoration:none;
  white-space:nowrap;
  transition:color .18s var(--ease);
}
.site-nav__link:hover{color:var(--text)}
.site-nav__idx{
  font-size:11px;
  color:var(--text-3);
  transition:color .18s var(--ease);
}
.site-nav__link::after{
  content:"";
  position:absolute;
  left:12px;right:12px;bottom:5px;
  height:1px;
  background:var(--brand-soft);
  transform:scaleX(0);
  transform-origin:left;
  transition:transform .2s var(--ease),background .18s var(--ease);
}
.site-nav__link:hover::after{transform:scaleX(1)}
.site-nav__link[aria-current="page"]{color:var(--text)}
.site-nav__link[aria-current="page"] .site-nav__idx{color:var(--cyan)}
.site-nav__link[aria-current="page"]::after{
  height:2px;
  background:var(--cyan);
  transform:scaleX(1);
}
.site-nav__actions{
  display:flex;
  align-items:center;
  gap:10px;
  padding-left:20px;
  border-left:1px solid var(--line);
}

/* ---------- 06 按钮 / 标签 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:12px 20px;
  border:1px solid transparent;
  border-radius:2px;
  font-family:var(--font-body);
  font-size:var(--fs-14);
  font-weight:600;
  letter-spacing:.02em;
  text-decoration:none;
  cursor:pointer;
  transition:transform .18s var(--ease),background .18s var(--ease),
             border-color .18s var(--ease),color .18s var(--ease),box-shadow .18s var(--ease);
}
.btn--sm{padding:8px 14px;font-size:var(--fs-12)}
.btn--primary{
  background:var(--brand);
  color:#fff;
  box-shadow:4px 4px 0 rgba(0,229,192,.22);
}
.btn--primary:hover{background:#2A5CFF;color:#fff;transform:translateY(-2px);box-shadow:4px 7px 0 rgba(0,229,192,.3)}
.btn--ghost{
  background:rgba(22,27,63,.65);
  border-color:var(--line);
  color:var(--text-2);
}
.btn--ghost:hover{border-color:var(--cyan);color:var(--text);transform:translateY(-2px)}
.btn--accent{
  background:rgba(255,138,61,.1);
  border-color:rgba(255,138,61,.6);
  color:var(--amber);
}
.btn--accent:hover{background:rgba(255,138,61,.2);color:var(--amber);transform:translateY(-2px)}
.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:3px 10px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.1em;
  text-transform:uppercase;
  border:1px solid var(--line);
  background:rgba(35,43,92,.45);
  color:var(--text-2);
}
.tag--cyan{color:var(--cyan);border-color:rgba(0,229,192,.5);background:rgba(0,229,192,.08)}
.tag--amber{color:var(--amber);border-color:rgba(255,138,61,.5);background:rgba(255,138,61,.08)}

/* ---------- 07 卡片 / 表格 / 折叠 ---------- */
.card{
  position:relative;
  background:var(--surface);
  border:1px solid var(--line);
  padding:24px;
  box-shadow:var(--shadow-paper);
  transition:transform .18s var(--ease),border-color .18s var(--ease),box-shadow .18s var(--ease);
}
.card:hover{transform:translateY(-2px);border-color:var(--cyan);box-shadow:var(--shadow-paper-hover)}
.card--paper{
  background:#fff;
  color:#101538;
  border-color:#D7DCF3;
  box-shadow:6px 6px 0 rgba(27,77,255,.16);
}
.card--paper:hover{border-color:var(--brand);box-shadow:6px 9px 0 rgba(27,77,255,.24)}
.card__label{
  display:block;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--text-3);
  margin-bottom:10px;
}
.card__title{font-size:var(--fs-20);font-weight:700;line-height:1.3;margin:0 0 8px;color:inherit}
.card__text{font-size:var(--fs-14);color:var(--text-2);margin:0}
.card--paper .card__text{color:#39426E}

.data-table{
  width:100%;
  border-collapse:collapse;
  font-size:var(--fs-14);
  background:rgba(22,27,63,.5);
  border:1px solid var(--line);
}
.data-table th,.data-table td{
  padding:12px 14px;
  text-align:left;
  border-bottom:1px solid var(--line);
  vertical-align:top;
}
.data-table th{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.12em;
  text-transform:uppercase;
  color:var(--text-3);
  background:rgba(35,43,92,.6);
  font-weight:600;
}
.data-table tbody tr{transition:background .18s var(--ease)}
.data-table tbody tr:hover{background:rgba(27,77,255,.1)}
.data-table .mono{color:var(--cyan)}

.disclosure{
  border:1px solid var(--line);
  background:var(--surface);
}
.disclosure + .disclosure{margin-top:-1px}
.disclosure > summary{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  padding:16px 20px;
  font-weight:600;
  color:var(--text);
  cursor:pointer;
  list-style:none;
}
.disclosure > summary::-webkit-details-marker{display:none}
.disclosure > summary::after{
  content:"+";
  font-family:var(--font-mono);
  color:var(--cyan);
  flex:none;
}
.disclosure[open] > summary{border-bottom:1px solid var(--line)}
.disclosure[open] > summary::after{content:"–"}
.disclosure__body{
  padding:16px 20px 20px;
  color:var(--text-2);
  font-size:var(--fs-14);
  animation:reveal-fade .24s var(--ease) 60ms both;
}
@keyframes reveal-fade{
  from{opacity:0;transform:translateY(-4px)}
  to{opacity:1;transform:none}
}

/* ---------- 08 图片容器（页面阶段复用） ---------- */
.media-frame{
  position:relative;
  display:block;
  width:100%;
  aspect-ratio:16 / 10;
  overflow:hidden;
  border:1px solid var(--line);
  background:linear-gradient(150deg,var(--ink-800) 0%,var(--ink-700) 55%,rgba(27,77,255,.38) 100%);
  box-shadow:8px 8px 0 rgba(35,43,92,.5);
}
.media-frame img{width:100%;height:100%;object-fit:cover}
.media-frame::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background-image:
    repeating-linear-gradient(90deg,rgba(245,247,255,.05) 0 1px,transparent 1px 56px),
    repeating-linear-gradient(0deg,rgba(245,247,255,.04) 0 1px,transparent 1px 56px);
}
.media-frame--wide{aspect-ratio:21 / 9}
.media-frame--square{aspect-ratio:1 / 1}
.media-frame--tall{aspect-ratio:4 / 5}
.media-frame--paper{
  background:linear-gradient(150deg,#E4EAFF 0%,#F5F7FF 58%,rgba(0,229,192,.24) 100%);
  border-color:#D7DCF3;
  box-shadow:8px 8px 0 rgba(27,77,255,.14);
}
.media-frame--paper::after{
  background-image:
    repeating-linear-gradient(90deg,rgba(27,77,255,.06) 0 1px,transparent 1px 56px),
    repeating-linear-gradient(0deg,rgba(27,77,255,.05) 0 1px,transparent 1px 56px);
}
.media-frame__tag{
  position:absolute;
  top:0;left:0;
  z-index:2;
  padding:6px 12px;
  background:var(--ink-900);
  color:var(--cyan);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.14em;
  text-transform:uppercase;
  border-right:1px solid var(--line);
  border-bottom:1px solid var(--line);
}

/* ---------- 09 面包屑 ---------- */
.breadcrumb{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:0;
  margin:0;
  padding:0;
  list-style:none;
  font-family:var(--font-mono);
  font-size:var(--fs-12);
  letter-spacing:.08em;
  color:var(--text-3);
}
.breadcrumb li{display:inline-flex;align-items:center}
.breadcrumb li + li::before{content:"/";margin:0 10px;color:var(--ink-600)}
.breadcrumb a{color:var(--text-2);text-decoration:none}
.breadcrumb a:hover{color:var(--cyan)}
.breadcrumb [aria-current="page"]{color:var(--cyan)}

/* ---------- 10 页脚 ---------- */
.site-footer{
  position:relative;
  z-index:1;
  margin-top:auto;
  background:var(--ink-800);
  border-top:1px solid var(--line);
}
.site-footer::before{
  content:"";
  display:block;
  height:3px;
  background:linear-gradient(90deg,var(--brand) 0%,var(--brand-soft) 34%,var(--cyan) 70%,var(--amber) 100%);
}
.site-footer__grid{
  display:grid;
  grid-template-columns:1.5fr 1fr 1.2fr 1.2fr;
  gap:40px;
  padding-top:64px;
  padding-bottom:48px;
}
.footer-col{min-width:0}
.footer-col__title{
  display:flex;
  align-items:center;
  gap:8px;
  margin:0 0 18px;
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:600;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--text-3);
}
.footer-col__title::before{
  content:"";
  display:block;
  width:14px;
  height:1px;
  background:var(--cyan);
  flex:none;
}
.footer-links{
  display:flex;
  flex-direction:column;
  gap:10px;
  margin:0;
  padding:0;
  list-style:none;
  font-size:var(--fs-14);
  color:var(--text-2);
}
.footer-links a{
  color:var(--text-2);
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color .18s var(--ease),border-color .18s var(--ease);
}
.footer-links a:hover{color:var(--text);border-bottom-color:var(--cyan)}
.footer-note{
  margin:16px 0 0;
  max-width:30em;
  font-size:var(--fs-14);
  line-height:1.7;
  color:var(--text-2);
}
.footer-note--mono{color:var(--text-3);font-size:var(--fs-12);letter-spacing:.12em}
.footer-legal{
  margin:12px 0 0;
  font-size:var(--fs-12);
  color:var(--text-3);
}
.site-footer__base{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  padding-top:20px;
  padding-bottom:28px;
  border-top:1px solid var(--line);
  font-size:var(--fs-12);
  color:var(--text-3);
}
.site-footer__base p{margin:0}

/* ---------- 11 交互附加件（由 JS 生成） ---------- */
.scroll-progress{
  position:fixed;
  top:0;left:0;
  z-index:200;
  width:0;
  height:2px;
  background:linear-gradient(90deg,var(--brand),var(--cyan));
  pointer-events:none;
}
.to-top{
  position:fixed;
  right:24px;bottom:24px;
  z-index:90;
  display:none;
  align-items:center;
  justify-content:center;
  width:44px;height:44px;
  background:rgba(22,27,63,.94);
  border:1px solid var(--line);
  color:var(--cyan);
  font-family:var(--font-mono);
  font-size:var(--fs-16);
  cursor:pointer;
  transition:transform .18s var(--ease),border-color .18s var(--ease);
}
.to-top[data-visible]{display:flex}
.to-top:hover{border-color:var(--cyan);transform:translateY(-2px)}

/* ---------- 12 显现动画 ---------- */
.js-ready [data-reveal]{
  opacity:0;
  transform:translateY(12px);
  transition:opacity .32s var(--ease),transform .32s var(--ease);
}
.js-ready [data-reveal].is-visible{opacity:1;transform:none}

/* ---------- 13 响应式 ---------- */
@media (max-width:1200px){
  :root{--gutter:40px}
  .layout-split{gap:32px}
  .site-nav{gap:16px}
  .site-nav__link{padding:10px 8px}
}

@media (max-width:1024px){
  :root{--gutter:24px}
  .section{padding:72px 0}
  .section--wide{padding:96px 0}
  .layout-split,.layout-split--reverse{grid-template-columns:minmax(0,1fr);gap:32px}
  .panel-sticky{position:static;top:auto}
  .grid-12{grid-template-columns:repeat(6,minmax(0,1fr))}
  .site-footer__grid{grid-template-columns:1fr 1fr;gap:32px;padding-top:48px;padding-bottom:36px}

  .nav-toggle{display:inline-flex;margin-left:auto}
  .brand__meta{display:none}

  .site-nav{
    position:fixed;
    left:0;right:0;
    top:var(--header-h);
    z-index:99;
    flex-direction:column;
    align-items:stretch;
    gap:0;
    max-height:calc(100vh - var(--header-h));
    overflow-y:auto;
    padding:20px var(--gutter) 32px;
    background:var(--ink-800);
    border-bottom:1px solid var(--line);
    box-shadow:0 18px 32px rgba(11,16,48,.6);
    opacity:0;
    visibility:hidden;
    transform:translateY(-12px);
    transition:opacity .2s var(--ease),transform .24s var(--ease),visibility .2s var(--ease);
  }
  .site-nav[data-open]{
    opacity:1;
    visibility:visible;
    transform:translateY(0);
  }
  .site-nav__list{
    flex-direction:column;
    align-items:stretch;
    gap:0;
    width:100%;
  }
  .site-nav__link{
    padding:15px 4px;
    font-size:var(--fs-16);
    border-bottom:1px solid rgba(35,43,92,.75);
  }
  .site-nav__link::after{left:4px;right:auto;width:26px;bottom:12px}
  .site-nav__actions{
    flex-direction:column;
    align-items:stretch;
    gap:12px;
    margin-top:20px;
    padding:20px 0 0;
    border-left:0;
    border-top:1px solid var(--line);
  }
  .site-nav__actions .tag{align-self:flex-start}
  .site-nav__actions .btn{width:100%}
}

@media (max-width:700px){
  :root{--header-h:64px}
  .site-footer__grid{grid-template-columns:1fr;padding-top:40px;padding-bottom:28px;gap:28px}
  .site-footer__base{justify-content:flex-start;padding-bottom:24px}
  .brand__name{font-size:var(--fs-16)}
  .brand__version{display:none}
  .display-title{font-size:clamp(2rem,8vw,2.75rem)}
  .display-title--xl{font-size:clamp(2.4rem,12vw,3.5rem)}
  .lede{font-size:var(--fs-16)}
  .card{padding:20px}
  .to-top{right:16px;bottom:16px}
}

/* ---------- 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;
  }
  .js-ready [data-reveal]{opacity:1;transform:none}
  .card:hover,.btn:hover,.to-top:hover{transform:none}
}