/* ============================================================
   新银河品牌站 · 共享样式 /assets/site.css
   深空基底 + 切角面板 + 轨道线稿 + 等宽信息层
   ============================================================ */

:root{
  --ink:#06070D;
  --rock:#23262F;
  --graphite:#3C414D;
  --cream:#F3EEE4;
  --nebula:#6B4BD6;
  --cyan:#3FC9E8;
  --gold:#E9B75D;
  --moss:#7E9C6C;
  --clay:#C36A4C;
  --mist:#A79BD8;

  --line:rgba(243,238,228,.12);
  --line-strong:rgba(243,238,228,.24);
  --veil:rgba(243,238,228,.04);

  --shell:1240px;
  --gutter:clamp(1.15rem,4vw,3.25rem);
  --cut:14px;
  --ease:cubic-bezier(.22,.61,.36,1);

  --font-display:"PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Helvetica Neue",Arial,sans-serif;
  --font-body:system-ui,-apple-system,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
  --font-mono:ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono",monospace;
}

/* ---------- reset ---------- */
*,*::before,*::after{box-sizing:border-box}
*{margin:0}
html{-webkit-text-size-adjust:100%}
body{
  min-height:100vh;
  background-color:var(--ink);
  background-image:
    radial-gradient(1100px 720px at 8% -10%, rgba(107,75,214,.34), transparent 62%),
    radial-gradient(880px 620px at 96% 2%, rgba(63,201,232,.15), transparent 60%),
    radial-gradient(760px 560px at 52% 108%, rgba(233,183,93,.09), transparent 66%);
  background-repeat:no-repeat;
  color:var(--cream);
  font-family:var(--font-body);
  font-size:clamp(1rem,.96rem + .18vw,1.0625rem);
  line-height:1.75;
  letter-spacing:.01em;
  overflow-x:hidden;
}
img,svg,video{display:block;max-width:100%}
ul,ol{list-style:none;padding:0}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0}
h1,h2,h3,h4{font-weight:400;line-height:1.25}
table{border-collapse:collapse;width:100%}
::selection{background:rgba(107,75,214,.55);color:var(--cream)}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;border-radius:2px}

/* ---------- 基础排版 ---------- */
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;font-feature-settings:"tnum" 1}

.display-title{
  font-family:var(--font-display);
  font-weight:300;
  font-size:clamp(2.4rem,6.5vw,5.4rem);
  line-height:1.05;
  letter-spacing:.07em;
}
.section__title{
  font-family:var(--font-display);
  font-weight:300;
  font-size:clamp(1.6rem,3.2vw,2.6rem);
  line-height:1.2;
  letter-spacing:.06em;
}
.lede{max-width:36em;color:rgba(243,238,228,.82)}
.eyebrow{
  display:inline-flex;align-items:center;gap:.65rem;
  font-size:12px;letter-spacing:.14em;color:var(--mist);
}
.eyebrow::before{content:"";width:20px;height:1px;background:linear-gradient(90deg,var(--cyan),transparent)}

.prose{max-width:36em;color:rgba(243,238,228,.86)}
.prose > * + *{margin-top:1em}
.prose h2{font-family:var(--font-display);font-size:1.35rem;letter-spacing:.06em;margin-top:2em;color:var(--cream)}
.prose h3{font-size:1.08rem;letter-spacing:.04em;margin-top:1.6em;color:var(--cream)}
.prose ul,.prose ol{display:grid;gap:.5rem;padding-left:1.15rem}
.prose ul li{position:relative}
.prose ul li::before{content:"";position:absolute;left:-1.15rem;top:.78em;width:7px;height:1px;background:var(--cyan)}
.prose ol{counter-reset:n;list-style:none}
.prose ol li{counter-increment:n;position:relative}
.prose ol li::before{content:counter(n,decimal-leading-zero);position:absolute;left:-2.1rem;top:.15em;font-family:var(--font-mono);font-size:12px;color:var(--gold)}
.prose a{color:var(--cyan);text-decoration:underline;text-underline-offset:3px;text-decoration-color:rgba(63,201,232,.45)}
.prose code{font-family:var(--font-mono);font-size:.875em;color:var(--gold);background:rgba(233,183,93,.08);padding:.1em .4em}

.divider{height:1px;border:0;background:linear-gradient(90deg,transparent,var(--line-strong) 10%,var(--line-strong) 90%,transparent)}
.slash-mark{display:inline-block;width:58px;height:3px;transform:skewX(-28deg);background:linear-gradient(90deg,var(--nebula),rgba(107,75,214,0))}
.orbit-ring{position:absolute;border:1px dashed rgba(167,155,216,.26);border-radius:50%;pointer-events:none}
.visually-hidden{position:absolute!important;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap}

/* ---------- 容器与网格 ---------- */
.shell{width:100%;max-width:var(--shell);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-block:clamp(2.5rem,6vw,5rem)}
.section__head{display:grid;gap:.9rem;margin-bottom:clamp(1.5rem,3vw,2.5rem)}

.layout{
  display:grid;
  grid-template-columns:minmax(0,7fr) minmax(0,3fr);
  gap:clamp(1.5rem,4vw,4rem);
  align-items:start;
}
.grid{display:grid;gap:clamp(1rem,2.4vw,1.75rem)}
.grid--cards{grid-template-columns:repeat(auto-fit,minmax(250px,1fr))}
.grid--split{grid-template-columns:repeat(auto-fit,minmax(320px,1fr))}

.rail{position:sticky;top:120px}
.rail__list{display:grid;gap:.15rem;border-left:1px solid var(--line);padding-left:1rem}
.rail__item{min-width:0}
.rail__link{
  position:relative;display:block;padding:.45rem 0;
  font-size:.875rem;letter-spacing:.05em;color:rgba(243,238,228,.6);
  transition:color .2s var(--ease);
}
.rail__link::before{
  content:"";position:absolute;left:-1rem;top:50%;width:1px;height:0;
  background:var(--gold);transform:translateY(-50%);
  transition:height .26s var(--ease);
}
.rail__link:hover{color:var(--cream)}
.rail__link.is-active{color:var(--gold)}
.rail__link.is-active::before{height:64%}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.55rem;
  padding:.72rem 1.35rem;
  font-size:.85rem;letter-spacing:.12em;line-height:1.2;
  border:1px solid transparent;cursor:pointer;white-space:nowrap;
  clip-path:polygon(var(--cut) 0,100% 0,100% calc(100% - var(--cut)),calc(100% - var(--cut)) 100%,0 100%,0 var(--cut));
  transition:color .2s var(--ease),background-color .2s var(--ease),border-color .2s var(--ease),box-shadow .2s var(--ease),transform .2s var(--ease);
}
.btn:hover{transform:translateY(-1px)}
.btn--amber{background:linear-gradient(120deg,var(--gold),#f0cd8b);color:#1a1206;box-shadow:0 8px 26px -14px rgba(233,183,93,.9)}
.btn--amber:hover{box-shadow:0 12px 30px -12px rgba(233,183,93,.95)}
.btn--cyan{border-color:rgba(63,201,232,.5);background:rgba(63,201,232,.1);color:var(--cyan)}
.btn--cyan:hover{background:rgba(63,201,232,.18)}
.btn--ghost{border-color:var(--line-strong);background:var(--veil);color:var(--cream)}
.btn--ghost:hover{border-color:rgba(167,155,216,.55);color:var(--mist)}

/* ---------- 面板与标签 ---------- */
.panel{
  position:relative;
  padding:clamp(1.25rem,2.4vw,1.9rem);
  background:linear-gradient(160deg,rgba(35,38,47,.92),rgba(35,38,47,.5));
  border:1px solid var(--line);
  clip-path:polygon(var(--cut) 0,100% 0,100% calc(100% - var(--cut)),calc(100% - var(--cut)) 100%,0 100%,0 var(--cut));
}
.panel--flat{background:rgba(35,38,47,.45)}
.panel__label{font-size:12px;letter-spacing:.14em;color:var(--mist);margin-bottom:.6rem}
.panel__title{font-family:var(--font-display);font-weight:400;font-size:1.15rem;letter-spacing:.05em;margin-bottom:.5rem}
.panel__text{color:rgba(243,238,228,.74);font-size:.9375rem}

.tag{
  display:inline-flex;align-items:center;gap:.35rem;
  padding:.26rem .58rem;font-size:12px;letter-spacing:.1em;
  border:1px solid;line-height:1.5;
}
.tag--violet{color:var(--mist);border-color:rgba(167,155,216,.45);background:rgba(107,75,214,.16)}
.tag--cyan{color:var(--cyan);border-color:rgba(63,201,232,.45);background:rgba(63,201,232,.1)}
.tag--gold{color:var(--gold);border-color:rgba(233,183,93,.45);background:rgba(233,183,93,.1)}
.tag--jade{color:var(--moss);border-color:rgba(126,156,108,.5);background:rgba(126,156,108,.12)}
.tag--clay{color:var(--clay);border-color:rgba(195,106,76,.5);background:rgba(195,106,76,.12)}

/* ---------- 数据件 ---------- */
.stat{display:grid;gap:.2rem}
.stat__value{font-family:var(--font-mono);font-variant-numeric:tabular-nums;font-size:clamp(1.5rem,3vw,2.25rem);line-height:1.1;letter-spacing:.02em}
.stat__label{font-size:12px;letter-spacing:.14em;color:var(--mist)}
.meter{position:relative;height:4px;background:rgba(243,238,228,.1);overflow:hidden}
.meter__bar{display:block;height:100%;width:var(--value,50%);background:linear-gradient(90deg,var(--cyan),var(--nebula))}

/* ---------- 面包屑 ---------- */
.breadcrumbs{padding-top:1.25rem}
.breadcrumbs__list{display:flex;flex-wrap:wrap;gap:.4rem .7rem;font-size:12px;letter-spacing:.1em;color:var(--mist)}
.breadcrumbs__item{display:flex;align-items:center;gap:.7rem}
.breadcrumbs__item:not(:last-child)::after{content:"/";color:var(--graphite)}
.breadcrumbs__link{color:var(--mist);transition:color .2s var(--ease)}
.breadcrumbs__link:hover{color:var(--cyan)}
.breadcrumbs__current{color:var(--cream)}

/* ---------- 标签页 ---------- */
.tabs{display:block}
.tabs__list{display:flex;flex-wrap:wrap;gap:.2rem;border-bottom:1px solid var(--line);margin-bottom:clamp(1.25rem,2.4vw,2rem)}
.tabs__tab{
  position:relative;padding:.8rem 1.1rem;
  font-size:.9rem;letter-spacing:.09em;color:rgba(243,238,228,.68);
  cursor:pointer;transition:color .2s var(--ease);
}
.tabs__tab::after{
  content:"";position:absolute;left:0;right:0;bottom:-1px;height:2px;
  background:transparent;transition:background-color .24s var(--ease);
}
.tabs__tab:hover{color:var(--cream)}
.tabs__tab[aria-selected="true"]{color:var(--cream)}
.tabs__tab[aria-selected="true"]::after{background:linear-gradient(90deg,var(--cyan),var(--nebula) 70%,var(--gold))}
.tabs__panel{color:rgba(243,238,228,.86)}
.tabs__panel[hidden]{display:none}

/* ---------- 折叠面板 ---------- */
.accordion{display:grid;gap:.6rem}
.accordion__item{
  border:1px solid var(--line);
  border-left:2px solid rgba(107,75,214,.55);
  background:rgba(35,38,47,.45);
}
.accordion__trigger{
  width:100%;display:flex;align-items:center;justify-content:space-between;gap:1rem;
  padding:1rem 1.2rem;text-align:start;font-size:1rem;letter-spacing:.03em;
  color:var(--cream);cursor:pointer;transition:color .2s var(--ease);
}
.accordion__trigger:hover{color:var(--gold)}
.accordion__icon{position:relative;flex:none;width:14px;height:14px}
.accordion__icon::before,.accordion__icon::after{
  content:"";position:absolute;background:var(--cyan);transition:transform .24s var(--ease),opacity .24s var(--ease);
}
.accordion__icon::before{left:0;top:6px;width:14px;height:1px}
.accordion__icon::after{left:6px;top:0;width:1px;height:14px}
.accordion__trigger[aria-expanded="true"] .accordion__icon::after{transform:scaleY(0);opacity:0}
.accordion__panel{padding:0 1.2rem 1.2rem;color:rgba(243,238,228,.8);font-size:.9375rem}
.accordion__panel[hidden]{display:none}

/* ---------- 图片容器 ---------- */
.media{
  position:relative;overflow:hidden;aspect-ratio:16/9;
  border:1px solid var(--line);
  background:linear-gradient(150deg,rgba(35,38,47,.95),rgba(6,7,13,.92));
}
.media--wide{aspect-ratio:21/9}
.media--tall{aspect-ratio:3/4}
.media--square{aspect-ratio:1/1}
.media--orbit::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:radial-gradient(60% 60% at 72% 18%,rgba(107,75,214,.4),transparent 70%),
             radial-gradient(50% 50% at 12% 92%,rgba(63,201,232,.18),transparent 72%);
}
.media__img{width:100%;height:100%;object-fit:cover}
.media__caption{
  position:absolute;left:0;right:0;bottom:0;
  padding:.7rem 1rem;font-size:12px;letter-spacing:.1em;color:var(--mist);
  background:linear-gradient(0deg,rgba(6,7,13,.92),transparent);
}

/* ---------- 顶部导航 ---------- */
.skip-link{
  position:absolute;left:1rem;top:-120px;z-index:200;
  padding:.7rem 1.2rem;background:var(--cyan);color:var(--ink);
  font-size:.85rem;letter-spacing:.1em;
  transition:top .2s var(--ease);
}
.skip-link:focus{top:.7rem}

.site-header{
  position:sticky;top:0;z-index:80;
  background:rgba(6,7,13,.93);
  border-bottom:1px solid var(--line);
}

.header-top{
  max-height:60px;overflow:hidden;
  border-bottom:1px solid var(--line);
  background:linear-gradient(90deg,rgba(35,38,47,.92),rgba(35,38,47,.32));
  transition:max-height .34s var(--ease),opacity .24s var(--ease),border-color .3s var(--ease);
}
.site-header[data-condensed] .header-top{max-height:0;opacity:0;border-color:transparent}
.header-top__shell{display:flex;align-items:center;justify-content:space-between;gap:1rem;min-height:44px}
.header-top__brand{display:flex;align-items:center;gap:.65rem;font-size:12px;letter-spacing:.14em;color:var(--mist);white-space:nowrap}
.brand-mark{flex:none;width:8px;height:8px;border-radius:50%;background:var(--cyan);box-shadow:0 0 12px rgba(63,201,232,.9)}
.header-top__name{color:var(--cream)}
.header-top__rule{width:52px;height:1px;background:linear-gradient(90deg,var(--nebula),transparent)}
.header-top__tagline{color:var(--mist)}
.header-top__list{display:flex;align-items:center;gap:1.6rem}
.header-top__link{font-size:12px;letter-spacing:.12em;color:var(--mist);transition:color .2s var(--ease)}
.header-top__link:hover{color:var(--cyan)}

.header-main__shell{
  display:flex;align-items:center;gap:clamp(.75rem,2.2vw,2rem);
  min-height:clamp(64px,7vw,82px);
  transition:min-height .3s var(--ease);
}
.site-header[data-condensed] .header-main__shell{min-height:62px}

.brand{display:flex;align-items:center;gap:.7rem;margin-inline-end:auto;min-width:0}
.brand__glyph{
  position:relative;flex:none;width:30px;height:30px;border-radius:50%;
  border:1px solid rgba(167,155,216,.5);
  box-shadow:inset 0 0 14px rgba(107,75,214,.45);
}
.brand__glyph::before{
  content:"";position:absolute;inset:22%;border-radius:50%;
  background:radial-gradient(circle at 32% 30%,var(--gold),var(--nebula) 72%);
}
.brand__glyph::after{content:"";position:absolute;inset:4%;border-radius:50%;border:1px dashed rgba(63,201,232,.5)}
.brand__glyph--lg{width:44px;height:44px}
.brand__text{display:grid;line-height:1.2;min-width:0}
.brand__name{font-family:var(--font-display);font-weight:400;font-size:1.05rem;letter-spacing:.16em}
.brand__sub{font-size:12px;letter-spacing:.12em;color:var(--mist);white-space:nowrap}

.site-nav{display:flex;align-items:center}
.site-nav__label{display:none}
.site-nav__list{display:flex;align-items:center;gap:clamp(1rem,2.2vw,2rem)}
.site-nav__link{
  position:relative;display:inline-block;padding:.55rem 0;
  font-size:.9rem;letter-spacing:.09em;color:rgba(243,238,228,.76);
  transition:color .2s var(--ease);
}
.site-nav__link::after{
  content:"";position:absolute;left:0;bottom:.15rem;width:0;height:1px;
  background:linear-gradient(90deg,var(--cyan),var(--nebula));
  transition:width .28s var(--ease);
}
.site-nav__link:hover{color:var(--cream)}
.site-nav__link:hover::after{width:100%}
.site-nav__link[aria-current="page"]{color:var(--gold)}
.site-nav__link[aria-current="page"]::after{width:100%;background:linear-gradient(90deg,var(--gold),var(--clay))}
.site-nav__link[aria-current="page"]::before{
  content:"";position:absolute;left:-.8rem;top:50%;width:5px;height:5px;margin-top:-2.5px;
  border-radius:50%;background:var(--gold);box-shadow:0 0 10px rgba(233,183,93,.95);
}
.site-nav__extra{display:none}

.header-actions{display:flex;align-items:center;gap:.7rem}
.header-cta{font-size:.8rem;padding:.62rem 1.05rem;letter-spacing:.1em}

.nav-toggle{
  display:none;align-items:center;gap:.55rem;
  padding:.55rem .8rem;border:1px solid var(--line-strong);
  background:var(--veil);color:var(--cream);
  font-size:12px;letter-spacing:.14em;cursor:pointer;
}
.nav-toggle__bars{display:grid;gap:4px;width:16px}
.nav-toggle__bars span{display:block;height:1px;background:currentColor;transition:transform .24s var(--ease),opacity .2s var(--ease)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(1){transform:translateY(5px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(3){transform:translateY(-5px) rotate(-45deg)}

.scroll-rail{position:absolute;left:0;right:0;bottom:-1px;height:2px;background:rgba(243,238,228,.06);overflow:hidden}
.scroll-rail__bar{
  display:block;height:100%;width:0;
  background:linear-gradient(90deg,var(--cyan),var(--nebula) 55%,var(--gold));
  transition:width .12s linear;
}

/* ---------- 页脚 ---------- */
.site-footer{
  position:relative;overflow:hidden;
  margin-top:clamp(4rem,10vw,8rem);
  padding-block:clamp(3rem,7vw,5rem) 2rem;
  border-top:1px solid var(--line);
  background:linear-gradient(180deg,rgba(35,38,47,.55),rgba(6,7,13,1) 72%);
}
.site-footer::before{
  content:"";position:absolute;inset-inline:0;top:0;height:1px;
  background:linear-gradient(90deg,transparent,var(--nebula),var(--cyan) 42%,transparent 82%);
}
.footer-stars{
  position:absolute;inset:0;pointer-events:none;opacity:.75;
  background-image:
    radial-gradient(1.4px 1.4px at 12% 24%,rgba(243,238,228,.65),transparent 100%),
    radial-gradient(1.2px 1.2px at 31% 64%,rgba(63,201,232,.6),transparent 100%),
    radial-gradient(1.6px 1.6px at 57% 16%,rgba(233,183,93,.55),transparent 100%),
    radial-gradient(1.1px 1.1px at 76% 46%,rgba(167,155,216,.65),transparent 100%),
    radial-gradient(1.3px 1.3px at 89% 76%,rgba(243,238,228,.5),transparent 100%),
    radial-gradient(1.1px 1.1px at 45% 88%,rgba(107,75,214,.75),transparent 100%);
  background-repeat:no-repeat;
}
.footer-stars::after{
  content:"";position:absolute;right:-14%;top:-46%;
  width:min(620px,74vw);aspect-ratio:1;border-radius:50%;
  border:1px dashed rgba(167,155,216,.18);
}

.footer-top{
  position:relative;
  display:grid;grid-template-columns:minmax(0,1.1fr) minmax(0,2fr);
  gap:clamp(2rem,5vw,4rem);
}
.footer-brand__line{font-family:var(--font-display);font-weight:300;font-size:1.3rem;letter-spacing:.08em;margin-top:1.1rem}
.footer-brand__note{max-width:22em;margin-top:.6rem;font-size:.9375rem;color:rgba(243,238,228,.7)}
.footer-badges{display:flex;flex-wrap:wrap;gap:.5rem;margin-top:1.25rem}
.footer-badge{
  padding:.28rem .6rem;font-size:12px;letter-spacing:.1em;color:var(--mist);
  border:1px solid var(--line-strong);
  clip-path:polygon(8px 0,100% 0,100% calc(100% - 8px),calc(100% - 8px) 100%,0 100%,0 8px);
}
.footer-cols{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:1.75rem 1.5rem}
.footer-col__title{font-size:12px;letter-spacing:.14em;color:var(--mist);margin-bottom:.9rem}
.footer-list{display:grid;gap:.55rem}
.footer-link{
  position:relative;font-size:.9375rem;color:rgba(243,238,228,.72);
  padding-left:0;transition:color .2s var(--ease),padding-left .2s var(--ease);
}
.footer-link::before{
  content:"";position:absolute;left:0;top:.72em;width:0;height:1px;background:var(--cyan);
  transition:width .2s var(--ease);
}
.footer-link:hover{color:var(--cyan);padding-left:.85rem}
.footer-link:hover::before{width:.6rem}

.footer-contact{
  position:relative;margin-top:clamp(2.25rem,5vw,3.25rem);
  padding-top:1.75rem;border-top:1px solid var(--line);
}
.footer-contact__title{font-size:12px;letter-spacing:.14em;color:var(--mist);margin-bottom:1rem}
.footer-contact__list{display:flex;flex-wrap:wrap;gap:.7rem 2.25rem}
.footer-contact__item{display:flex;align-items:baseline;gap:.6rem;min-width:0}
.footer-contact__key{font-size:12px;letter-spacing:.14em;color:var(--graphite);flex:none}
.footer-contact__value{font-family:var(--font-mono);font-size:.875rem;color:rgba(243,238,228,.88);word-break:break-all}
.footer-contact__note{margin-top:.9rem;font-size:12px;letter-spacing:.06em;color:var(--mist)}

.footer-legal{
  margin-top:1.75rem;padding-top:1.5rem;border-top:1px solid var(--line);
  display:flex;flex-wrap:wrap;align-items:center;gap:.75rem 1.5rem;
  font-size:12px;letter-spacing:.08em;color:var(--mist);
}
.footer-legal__line{color:var(--mist)}
.footer-legal__year{color:rgba(243,238,228,.6)}
.footer-legal__links{display:flex;flex-wrap:wrap;gap:1.25rem;margin-left:auto}
.footer-legal__link{color:var(--mist);transition:color .2s var(--ease)}
.footer-legal__link:hover{color:var(--cyan)}

/* ---------- 渐进披露 ---------- */
html.js-ready [data-reveal]{
  opacity:0;transform:translateY(18px);
  transition:opacity .42s var(--ease),transform .42s var(--ease);
}
html.js-ready [data-reveal].is-visible{opacity:1;transform:none}

/* ---------- 响应式 ---------- */
@media (min-width:901px){
  body{background-attachment:fixed}
  .site-header{
    backdrop-filter:blur(16px) saturate(120%);
    -webkit-backdrop-filter:blur(16px) saturate(120%);
  }
}

@media (max-width:1040px){
  .layout{grid-template-columns:minmax(0,1fr)}
  .rail{position:static;top:auto}
  .rail__list{display:flex;flex-wrap:wrap;gap:.35rem 1.25rem;border-left:0;border-top:1px solid var(--line);padding-left:0;padding-top:.75rem}
  .rail__link::before{left:0;top:auto;bottom:0;width:0;height:1px;transform:none;transition:width .24s var(--ease)}
  .rail__link.is-active::before{height:1px;width:100%}
}

@media (max-width:900px){
  .nav-toggle{display:inline-flex}
  .header-actions{position:relative;z-index:95}
  .site-nav{
    position:fixed;inset:0;z-index:90;
    display:flex;flex-direction:column;gap:1.5rem;
    padding:clamp(5.5rem,16vh,8rem) var(--gutter) 2.5rem;
    background-color:rgba(6,7,13,.98);
    background-image:
      radial-gradient(760px 520px at 84% -8%,rgba(107,75,214,.42),transparent 66%),
      radial-gradient(520px 420px at 8% 96%,rgba(63,201,232,.14),transparent 70%);
    background-repeat:no-repeat;
    overflow-y:auto;
    opacity:0;visibility:hidden;pointer-events:none;
    transform:translateY(-10px);
    transition:opacity .26s var(--ease),transform .26s var(--ease),visibility .26s linear;
  }
  .site-nav[data-open]{opacity:1;visibility:visible;pointer-events:auto;transform:none}
  .site-nav__label{display:block;font-size:12px;letter-spacing:.14em;color:var(--mist);margin-bottom:.35rem}
  .site-nav__list{flex-direction:column;align-items:stretch;gap:0;width:100%}
  .site-nav__item{border-bottom:1px solid var(--line)}
  .site-nav__link{display:block;padding:.95rem .25rem;font-size:1.1rem;letter-spacing:.1em}
  .site-nav__link::after{bottom:0}
  .site-nav__link[aria-current="page"]::before{left:auto;right:.25rem;top:50%}
  .site-nav__extra{display:block;margin-top:.5rem}
  .site-nav__list--sub{flex-direction:row;flex-wrap:wrap;gap:.5rem 1.5rem}
  .site-nav__list--sub .site-nav__item{border-bottom:0}
  .site-nav__list--sub .site-nav__link{font-size:.95rem;padding:.4rem 0}

  html.is-nav-open{overflow:hidden}

  .header-top__rule{display:none}
  .footer-top{grid-template-columns:minmax(0,1fr)}
  .footer-cols{grid-template-columns:repeat(auto-fit,minmax(140px,1fr))}
  .footer-legal__links{margin-left:0}
}

@media (max-width:640px){
  .header-top__tagline{display:none}
  .brand__sub{display:none}
  .header-cta{padding:.55rem .7rem;font-size:.72rem;letter-spacing:.06em}
  .header-main__shell{gap:.6rem;min-height:62px}
  .footer-badges{display:none}
  .footer-contact__list{display:grid;gap:.7rem}
  .tabs__list{overflow-x:auto;flex-wrap:nowrap}
  .tabs__tab{padding:.7rem .85rem;font-size:.85rem;white-space:nowrap}
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{
    animation-duration:.001ms!important;
    animation-iteration-count:1!important;
    transition-duration:.001ms!important;
    scroll-behavior:auto!important;
  }
  html.js-ready [data-reveal]{opacity:1;transform:none}
  .scroll-rail__bar{transition:none}
  .btn:hover{transform:none}
}