/* ============================================================
   IM电竞 — 共享样式 /assets/site.css
   赛博竞技指挥舱 · 左右分屏 · 粗野主义边框 · 近单色荧光体系
   ============================================================ */

/* ---------- 1. 设计令牌 ---------- */
:root{
  --c-void:#05070C;
  --c-deck:#0C1118;
  --c-panel:#141B24;
  --c-line:#2A3542;
  --c-cyan:#00F0D0;
  --c-purple:#8A5CFF;
  --c-amber:#FFB020;
  --c-white:#F2F6FA;
  --c-mute:#7C8794;
  --c-alert:#FF4D6D;

  --shadow-hard:8px 8px 0 0 rgba(0,0,0,.62);
  --shadow-hard-sm:4px 4px 0 0 rgba(0,0,0,.6);
  --shadow-cyan:8px 8px 0 0 rgba(0,240,208,.22);

  --fs-anno:12px;
  --fs-sm:14px;
  --fs-body:17px;
  --fs-h3:24px;
  --fs-h2:40px;
  --fs-h1:72px;

  --gutter:clamp(16px,3vw,40px);
  --maxw:1320px;

  --ease:cubic-bezier(.2,.7,.3,1);
  --t-fast:.16s;
  --t-mid:.22s;

  --font-display:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-body:var(--font-display);
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,"Courier New",monospace;
}

/* ---------- 2. Reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
html.is-locked{overflow:hidden}
body,h1,h2,h3,h4,h5,p,figure,blockquote,dl,dd{margin:0}
ul,ol{padding:0;margin:0;list-style:none}
img,svg,video{display:block;max-width:100%}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer}
a{color:inherit;text-decoration:none}
:focus-visible{outline:2px solid var(--c-cyan);outline-offset:2px}

/* ---------- 3. 基础排版 ---------- */
body{
  min-height:100vh;
  font-family:var(--font-body);
  font-size:var(--fs-body);
  font-weight:400;
  line-height:1.75;
  color:var(--c-white);
  background-color:var(--c-void);
  background-image:radial-gradient(120% 55% at 50% -12%, rgba(0,240,208,.07), rgba(5,7,12,0) 62%);
  background-repeat:no-repeat;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
h1,h2,h3,h4{font-weight:800;letter-spacing:-.02em;line-height:1.14}
h1{font-size:clamp(38px,5.6vw,var(--fs-h1))}
h2{font-size:clamp(26px,3.2vw,var(--fs-h2))}
h3{font-size:var(--fs-h3);line-height:1.35}
strong{font-weight:700}
::selection{background:var(--c-cyan);color:#04120F}
::-webkit-scrollbar{width:10px;height:10px}
::-webkit-scrollbar-track{background:var(--c-void)}
::-webkit-scrollbar-thumb{background:var(--c-line);border:2px solid var(--c-void)}
::-webkit-scrollbar-thumb:hover{background:var(--c-cyan)}

/* ---------- 4. 无障碍跳转 ---------- */
.skip-link{
  position:fixed;
  top:10px;left:10px;
  z-index:900;
  padding:10px 18px;
  font-family:var(--font-mono);
  font-size:13px;
  font-weight:700;
  letter-spacing:.06em;
  color:#04120F;
  background:var(--c-cyan);
  border:2px solid #04120F;
  box-shadow:var(--shadow-hard-sm);
  transform:translateY(-200%);
  transition:transform var(--t-fast) var(--ease);
}
.skip-link:focus,
.skip-link:focus-visible{transform:translateY(0)}

/* ---------- 5. 头部 ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:120;
  background:rgba(5,7,12,.94);
  border-bottom:1px solid var(--c-line);
  -webkit-backdrop-filter:blur(8px);
  backdrop-filter:blur(8px);
}
.site-header__inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:clamp(12px,2vw,32px);
  max-width:1440px;
  margin:0 auto;
  padding:14px var(--gutter);
  transition:padding var(--t-mid) var(--ease);
}
.site-header[data-compact] .site-header__inner{padding-block:7px}

.brand-block{display:flex;flex-direction:column;gap:6px;min-width:0}
.brand{display:inline-flex;align-items:center;gap:12px;color:var(--c-white)}
.brand__mark{
  display:grid;
  place-items:center;
  flex:none;
  width:42px;height:42px;
  font-family:var(--font-mono);
  font-size:15px;
  font-weight:700;
  letter-spacing:.02em;
  color:var(--c-cyan);
  background:var(--c-panel);
  border:2px solid var(--c-line);
  box-shadow:var(--shadow-hard-sm);
  transition:border-color var(--t-fast) var(--ease),box-shadow var(--t-fast) var(--ease),width var(--t-mid) var(--ease),height var(--t-mid) var(--ease);
}
.brand:hover .brand__mark{border-color:var(--c-cyan);box-shadow:4px 4px 0 0 rgba(0,240,208,.28)}
.brand__text{display:flex;flex-direction:column;gap:2px;min-width:0}
.brand__name{font-size:20px;font-weight:800;letter-spacing:-.02em;line-height:1.1}
.brand__sub{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.06em;
  color:var(--c-mute);
  white-space:nowrap;
}
.site-header[data-compact] .brand__mark{width:34px;height:34px;font-size:13px}
.site-header[data-compact] .brand__sub{display:none}

.hud-status{
  display:flex;
  align-items:center;
  gap:8px;
  min-width:0;
  font-family:var(--font-mono);
  font-size:11px;
  line-height:1.4;
  letter-spacing:.04em;
  color:var(--c-mute);
}
.hud-status__dot{
  flex:none;
  width:6px;height:6px;
  background:var(--c-amber);
  box-shadow:0 0 0 3px rgba(255,176,32,.16);
}
.hud-status__label{
  flex:none;
  padding:1px 5px;
  font-size:10px;
  letter-spacing:.14em;
  color:var(--c-amber);
  border:1px solid rgba(255,176,32,.5);
}
.hud-status__text{
  min-width:0;
  overflow:hidden;
  text-overflow:ellipsis;
  white-space:nowrap;
}
.site-header[data-compact] .hud-status__text{display:none}

/* 移动端按钮 */
.nav-toggle{
  display:none;
  align-items:center;
  gap:10px;
  padding:10px 12px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.12em;
  color:var(--c-white);
  background:var(--c-panel);
  border:2px solid var(--c-line);
  transition:border-color var(--t-fast) var(--ease),color var(--t-fast) var(--ease);
}
.nav-toggle:hover{border-color:var(--c-cyan);color:var(--c-cyan)}
.nav-toggle__bars{display:grid;gap:4px;width:18px}
.nav-toggle__bars span{
  display:block;
  height:2px;
  background:currentColor;
  transition:transform var(--t-mid) var(--ease),opacity var(--t-fast) linear;
}
.site-header[data-open] .nav-toggle__bars span:nth-child(1){transform:translateY(6px) rotate(45deg)}
.site-header[data-open] .nav-toggle__bars span:nth-child(2){opacity:0}
.site-header[data-open] .nav-toggle__bars span:nth-child(3){transform:translateY(-6px) rotate(-45deg)}
.nav-toggle__label{white-space:nowrap}

/* 导航面板（桌面） */
.site-nav{
  position:relative;
  z-index:2;
  display:flex;
  align-items:center;
  gap:12px;
  padding:8px 10px;
  background:var(--c-panel);
  border:1px solid var(--c-line);
  box-shadow:6px 6px 0 0 rgba(0,0,0,.55);
}
.site-nav__head{display:none}
.site-nav__list{display:flex;align-items:center;gap:2px}
.site-nav__item{display:block}
.site-nav__link{
  display:flex;
  align-items:baseline;
  gap:6px;
  padding:8px 10px;
  font-size:var(--fs-sm);
  line-height:1.2;
  color:var(--c-white);
  border:1px solid transparent;
  transition:color var(--t-fast) var(--ease),background var(--t-fast) var(--ease),border-color var(--t-fast) var(--ease);
}
.site-nav__index{
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.06em;
  color:var(--c-mute);
  transition:color var(--t-fast) var(--ease);
}
.site-nav__label{white-space:nowrap}
.site-nav__link:hover,
.site-nav__link:focus-visible{
  color:var(--c-cyan);
  background:var(--c-deck);
  border-color:var(--c-line);
}
.site-nav__link:hover .site-nav__index,
.site-nav__link:focus-visible .site-nav__index{color:var(--c-cyan)}
.site-nav__link[aria-current="page"]{
  color:var(--c-cyan);
  background:rgba(0,240,208,.08);
  border-color:rgba(0,240,208,.4);
}
.site-nav__link[aria-current="page"] .site-nav__index{color:var(--c-amber)}
.site-nav__foot{display:none}
.site-nav__foot .btn{width:100%;justify-content:center}

/* 遮罩 */
.nav-scrim{
  position:fixed;
  inset:0;
  z-index:1;
  background:rgba(3,5,9,.74);
  opacity:0;
  pointer-events:none;
  transition:opacity var(--t-mid) var(--ease);
}
.site-header[data-open] .nav-scrim{opacity:1;pointer-events:auto}

/* 滚动读数条 */
.hud-progress{
  height:2px;
  background:var(--c-line);
  overflow:hidden;
}
.hud-progress__bar{
  display:block;
  width:0;
  height:100%;
  background:linear-gradient(90deg,var(--c-cyan),var(--c-purple) 68%,var(--c-amber));
  transition:width .08s linear;
}

/* ---------- 6. 页脚 ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(56px,8vw,112px);
  background:var(--c-deck);
  border-top:2px solid var(--c-line);
  overflow:hidden;
}
.site-footer::before{
  content:"";
  position:absolute;
  inset:0 auto 0 0;
  width:48%;
  background:linear-gradient(118deg,rgba(138,92,255,.12),rgba(0,240,208,.05) 46%,rgba(5,7,12,0) 74%);
  -webkit-clip-path:polygon(0 0,100% 0,60% 100%,0 100%);
  clip-path:polygon(0 0,100% 0,60% 100%,0 100%);
  pointer-events:none;
}
.site-footer__inner{
  position:relative;
  max-width:var(--maxw);
  margin:0 auto;
  padding:clamp(40px,6vw,72px) var(--gutter) 26px;
}
.footer-top{
  display:grid;
  grid-template-columns:minmax(0,1fr) minmax(0,1.5fr);
  gap:clamp(28px,5vw,64px);
  align-items:start;
}
.footer-brand{display:flex;flex-direction:column;align-items:flex-start;gap:14px}
.footer-brand__eyebrow{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.22em;
  color:var(--c-cyan);
}
.footer-brand__link{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-size:19px;
  font-weight:800;
  letter-spacing:-.01em;
  color:var(--c-white);
  transition:color var(--t-fast) var(--ease);
}
.footer-brand__link::before{
  content:"";
  width:9px;height:9px;
  background:var(--c-cyan);
  box-shadow:0 0 0 3px rgba(0,240,208,.16);
}
.footer-brand__link:hover{color:var(--c-cyan)}
.footer-brand__line{
  max-width:16ch;
  font-size:clamp(22px,2.6vw,32px);
  font-weight:800;
  line-height:1.34;
  letter-spacing:-.01em;
}
.footer-brand__line::after{
  content:"";
  display:block;
  width:64px;
  height:3px;
  margin-top:18px;
  background:var(--c-amber);
}

.footer-cols{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:clamp(18px,3vw,32px);
}
.footer-col{min-width:0}
.footer-col__title{
  margin-bottom:12px;
  padding-bottom:9px;
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:500;
  letter-spacing:.2em;
  line-height:1.4;
  color:var(--c-mute);
  border-bottom:1px solid var(--c-line);
}
.footer-col__list{display:flex;flex-direction:column}
.footer-link{
  display:inline-block;
  padding:7px 0;
  font-size:15px;
  color:var(--c-white);
  transition:color var(--t-fast) var(--ease),transform var(--t-fast) var(--ease);
}
.footer-link:hover{color:var(--c-cyan);transform:translateX(3px)}

.footer-contact{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(240px,1fr));
  gap:18px 32px;
  margin-top:clamp(28px,4vw,48px);
  padding-top:22px;
  border-top:1px solid var(--c-line);
}
.footer-contact__row{display:flex;flex-direction:column;gap:3px;min-width:0}
.footer-contact__k{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.18em;
  color:var(--c-mute);
}
.footer-contact__v{font-size:15px;line-height:1.6;color:var(--c-white)}
.footer-contact__v--mono{
  font-family:var(--font-mono);
  font-size:14px;
  letter-spacing:.02em;
  word-break:break-word;
}
.footer-contact__note{
  grid-column:1/-1;
  max-width:52em;
  font-size:13px;
  line-height:1.7;
  color:var(--c-mute);
}
.footer-bottom{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:10px 24px;
  margin-top:26px;
  padding-top:16px;
  border-top:1px solid var(--c-line);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.04em;
  color:var(--c-mute);
}
.footer-legal{color:var(--c-mute)}
.footer-legal [data-year]{color:var(--c-amber)}
.footer-meta{color:var(--c-mute)}

/* ---------- 7. 布局与容器 ---------- */
.container{
  width:100%;
  max-width:var(--maxw);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.section{padding-block:clamp(44px,7vw,92px)}
.section--deck{
  background:var(--c-deck);
  border-block:1px solid var(--c-line);
}
.section-head{
  display:flex;
  flex-wrap:wrap;
  align-items:flex-end;
  justify-content:space-between;
  gap:16px 32px;
  margin-bottom:clamp(20px,3vw,36px);
  padding-bottom:14px;
  border-bottom:1px solid var(--c-line);
}
.section-head__title{font-size:clamp(24px,2.8vw,34px)}
.section-head__meta{
  font-family:var(--font-mono);
  font-size:var(--fs-anno);
  letter-spacing:.14em;
  color:var(--c-mute);
}
.eyebrow{
  display:inline-block;
  font-family:var(--font-mono);
  font-size:var(--fs-anno);
  letter-spacing:.2em;
  color:var(--c-cyan);
}
.eyebrow::before{content:"[ "}
.eyebrow::after{content:" ]"}
.label-vertical{
  writing-mode:vertical-rl;
  text-orientation:mixed;
  font-family:var(--font-mono);
  font-size:var(--fs-anno);
  letter-spacing:.32em;
  color:var(--c-mute);
}
.split{
  display:grid;
  grid-template-columns:minmax(120px,200px) minmax(0,1fr);
  gap:clamp(20px,4vw,56px);
  align-items:start;
}
.rail{
  display:flex;
  flex-direction:column;
  gap:12px;
  position:sticky;
  top:120px;
  align-self:start;
}
.grid{display:grid;gap:clamp(14px,2vw,24px)}
.grid--2{grid-template-columns:repeat(auto-fit,minmax(260px,1fr))}
.grid--3{grid-template-columns:repeat(auto-fit,minmax(220px,1fr))}
.rule{height:1px;background:var(--c-line);border:0;margin:0}

/* ---------- 8. 按钮与标签 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:10px;
  padding:12px 22px;
  font-family:var(--font-body);
  font-size:15px;
  font-weight:700;
  letter-spacing:.02em;
  line-height:1.2;
  text-align:center;
  border:2px solid var(--c-line);
  border-radius:0;
  background:transparent;
  color:var(--c-white);
  transition:transform var(--t-fast) var(--ease),box-shadow var(--t-fast) var(--ease),border-color var(--t-fast) var(--ease),color var(--t-fast) var(--ease),background var(--t-fast) var(--ease);
}
.btn--primary{
  color:#04120F;
  background:var(--c-cyan);
  border-color:var(--c-cyan);
  box-shadow:4px 4px 0 0 rgba(0,240,208,.25);
}
.btn--primary:hover{
  transform:translate(-2px,-2px);
  box-shadow:6px 6px 0 0 rgba(0,240,208,.35);
}
.btn--ghost{
  color:var(--c-white);
  background:rgba(20,27,36,.6);
  border-color:var(--c-line);
}
.btn--ghost:hover{
  color:var(--c-cyan);
  border-color:var(--c-cyan);
  transform:translate(-2px,-2px);
  box-shadow:4px 4px 0 0 rgba(0,0,0,.55);
}
.btn--sm{padding:8px 14px;font-size:13px}
.btn:focus-visible{outline-offset:3px}

.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:3px 8px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.12em;
  text-transform:uppercase;
  color:var(--c-mute);
  background:var(--c-deck);
  border:1px solid var(--c-line);
}
.tag--cyan{color:var(--c-cyan);border-color:rgba(0,240,208,.45);background:rgba(0,240,208,.07)}
.tag--purple{color:var(--c-purple);border-color:rgba(138,92,255,.45);background:rgba(138,92,255,.08)}
.tag--amber{color:var(--c-amber);border-color:rgba(255,176,32,.45);background:rgba(255,176,32,.08)}

.readout{
  font-family:var(--font-mono);
  font-size:clamp(24px,3vw,40px);
  font-weight:700;
  letter-spacing:-.01em;
  color:var(--c-cyan);
}
.num{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  letter-spacing:-.01em;
}

/* ---------- 9. 面板与卡片 ---------- */
.panel{
  position:relative;
  padding:clamp(18px,2.4vw,26px);
  background:var(--c-panel);
  border:1px solid var(--c-line);
}
.panel--float{
  border-left:2px solid var(--c-cyan);
  box-shadow:var(--shadow-hard);
}
.lift{
  transition:transform var(--t-fast) var(--ease),border-color var(--t-fast) var(--ease),box-shadow var(--t-fast) var(--ease);
}
.lift:hover,
.lift:focus-within{
  transform:translateY(-2px);
  border-color:var(--c-cyan);
  box-shadow:2px 2px 0 0 rgba(0,0,0,.7),8px 8px 0 0 rgba(0,240,208,.18);
}

/* ---------- 10. 正文与面包屑 ---------- */
.prose{max-width:34em}
.prose > * + *{margin-top:1em}
.prose p{line-height:1.75}
.prose h2{margin-top:2em;font-size:clamp(24px,2.6vw,30px)}
.prose h3{margin-top:1.6em;font-size:20px;letter-spacing:0}
.prose ul,
.prose ol{display:flex;flex-direction:column;gap:.5em;max-width:34em}
.prose li{position:relative;padding-left:1.3em;line-height:1.7}
.prose li::before{
  content:"—";
  position:absolute;
  left:0;
  color:var(--c-cyan);
}
.prose a{
  color:var(--c-cyan);
  text-decoration:underline;
  text-underline-offset:3px;
  text-decoration-thickness:1px;
}
.prose strong{color:var(--c-white)}
.prose blockquote{
  padding:14px 18px;
  border-left:2px solid var(--c-purple);
  background:var(--c-deck);
  color:var(--c-mute);
}
.breadcrumb{
  display:flex;
  flex-wrap:wrap;
  gap:8px;
  font-family:var(--font-mono);
  font-size:var(--fs-anno);
  letter-spacing:.08em;
  color:var(--c-mute);
}
.breadcrumb li{display:flex;align-items:center;gap:8px}
.breadcrumb li + li::before{content:"/";color:var(--c-line)}
.breadcrumb a{color:var(--c-mute);transition:color var(--t-fast) var(--ease)}
.breadcrumb a:hover{color:var(--c-cyan)}
.breadcrumb [aria-current="page"]{color:var(--c-white)}

/* ---------- 11. 图片容器基础规则 ---------- */
.figure{
  position:relative;
  display:flex;
  flex-direction:column;
  margin:0;
  background:var(--c-panel);
  border:2px solid var(--c-line);
  box-shadow:var(--shadow-hard-sm);
}
.figure__media{
  position:relative;
  aspect-ratio:16/9;
  overflow:hidden;
  background:
    linear-gradient(135deg,#0C1118 0%,#141B24 52%,#0C1118 100%);
}
.figure__media img{
  width:100%;
  height:100%;
  object-fit:cover;
  filter:saturate(.92) contrast(1.06) brightness(.95);
}
.figure__media::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background:repeating-linear-gradient(0deg,rgba(0,0,0,.22) 0 1px,rgba(0,0,0,0) 1px 3px);
  opacity:.55;
}
.figure__media[data-placeholder]::before{
  content:"";
  position:absolute;
  inset:0;
  background:
    linear-gradient(45deg,rgba(0,240,208,0) 49.6%,rgba(0,240,208,.18) 49.6% 50.4%,rgba(0,240,208,0) 50.4%),
    linear-gradient(-45deg,rgba(138,92,255,0) 49.6%,rgba(138,92,255,.16) 49.6% 50.4%,rgba(138,92,255,0) 50.4%);
}
.figure__cap{
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  justify-content:space-between;
  gap:4px 12px;
  padding:10px 12px;
  font-family:var(--font-mono);
  font-size:var(--fs-anno);
  line-height:1.6;
  letter-spacing:.04em;
  color:var(--c-mute);
  border-top:1px solid var(--c-line);
}
.figure__cap strong{color:var(--c-cyan);font-weight:500}
.figure--wide .figure__media{aspect-ratio:21/9}
.figure--square .figure__media{aspect-ratio:1/1}
.figure--tall .figure__media{aspect-ratio:3/4}

/* ---------- 12. 渐显（页面阶段使用 data-reveal） ---------- */
.has-js [data-reveal]{
  opacity:0;
  transform:translateY(10px);
  transition:opacity .3s var(--ease),transform .3s var(--ease);
}
.has-js [data-reveal][data-revealed]{
  opacity:1;
  transform:none;
}

/* ---------- 13. 响应式 ---------- */
@media (min-width:1280px){
  .site-nav__foot{display:block}
}
@media (max-width:1279px){
  .site-nav__link{padding:8px;font-size:13px}
  .site-nav__index{display:none}
}
@media (max-width:1080px){
  .nav-toggle{display:inline-flex}
  .site-nav{
    position:fixed;
    top:0;right:0;bottom:0;
    z-index:3;
    width:min(86vw,360px);
    display:flex;
    flex-direction:column;
    align-items:stretch;
    gap:0;
    padding:88px 20px 28px;
    background:var(--c-deck);
    border:0;
    border-left:2px solid var(--c-line);
    box-shadow:-14px 0 0 0 rgba(0,0,0,.5);
    overflow-y:auto;
    overscroll-behavior:contain;
    transform:translateX(104%);
    transition:transform .24s var(--ease);
  }
  .site-nav[data-open]{transform:translateX(0)}
  .site-nav__head{
    display:flex;
    flex-direction:column;
    gap:4px;
    margin-bottom:12px;
    padding-bottom:14px;
    border-bottom:1px solid var(--c-line);
  }
  .site-nav__head-cn{
    font-family:var(--font-mono);
    font-size:12px;
    letter-spacing:.28em;
    color:var(--c-cyan);
  }
  .site-nav__head-en{
    font-family:var(--font-mono);
    font-size:10px;
    letter-spacing:.2em;
    color:var(--c-mute);
  }
  .site-nav__list{flex-direction:column;align-items:stretch;gap:0}
  .site-nav__link{
    justify-content:flex-start;
    gap:12px;
    padding:14px 8px;
    font-size:18px;
    border:0;
    border-bottom:1px solid var(--c-line);
    border-left:2px solid transparent;
  }
  .site-nav__index{display:inline;font-size:11px}
  .site-nav__link[aria-current="page"]{
    background:rgba(0,240,208,.08);
    border-color:transparent;
    border-bottom-color:var(--c-line);
    border-left-color:var(--c-cyan);
  }
  .site-nav__foot{display:block;margin-top:20px}
  .site-nav__foot .btn{width:100%}
  .hud-status__text{display:none}
}
@media (max-width:860px){
  .footer-top{grid-template-columns:1fr}
  .footer-brand__line{max-width:20ch}
  .split{grid-template-columns:1fr}
  .rail{position:static;flex-direction:row;flex-wrap:wrap;gap:10px 16px}
  .label-vertical{writing-mode:horizontal-tb;letter-spacing:.24em}
}
@media (max-width:640px){
  body{font-size:16px}
  .brand__name{font-size:17px}
  .brand__mark{width:34px;height:34px;font-size:13px}
  .brand__sub{display:none}
  .nav-toggle__label{display:none}
  .footer-cols{grid-template-columns:1fr 1fr}
  .footer-bottom{flex-direction:column;align-items:flex-start}
  .section-head{flex-direction:column;align-items:flex-start}
}
@media (max-width:420px){
  .footer-cols{grid-template-columns:1fr}
}

/* ---------- 14. 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;
    scroll-behavior:auto !important;
  }
  .has-js [data-reveal]{opacity:1;transform:none;transition:none}
  .site-nav{transition:none}
  .hud-progress__bar{transition:none}
  .lift:hover,.lift:focus-within{transform:none}
  .btn--primary:hover,.btn--ghost:hover{transform:none}
  .footer-link:hover{transform:none}
}