/* =========================================================
   FG电子狂欢指南 · 共享样式表 /assets/site.css
   赛博嘉年华之夜 · 技术蓝图网格 · 粗野主义霓虹
   ========================================================= */

/* ---------- 1. Reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-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%;height:auto}
button,input,select,textarea{font:inherit;color:inherit}
button{background:none;border:0;cursor:pointer}
a{color:inherit;text-decoration:none}
table{border-collapse:collapse;width:100%}
#main-content{display:block;scroll-margin-top:150px}

/* ---------- 2. 变量 ---------- */
:root{
  --fg-void:#05040A;
  --fg-night:#12101F;
  --fg-purple:#6C2BD9;
  --fg-violet:#A855F7;
  --fg-cyan:#22E6E6;
  --fg-orange:#FF6A1A;
  --fg-pink:#FF2E88;
  --fg-ice:#F5F3FF;
  --fg-mist:#9C93B8;
  --fg-ember:#FFB37A;

  --fg-line:rgba(156,147,184,.28);
  --fg-line-strong:rgba(156,147,184,.5);
  --fg-cyan-soft:rgba(34,230,230,.14);
  --fg-pink-soft:rgba(255,46,136,.14);

  --fg-font-display:"Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --fg-font-body:"Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --fg-font-index:ui-monospace,"JetBrains Mono","SFMono-Regular",Menlo,Consolas,monospace;

  --fg-wrap:1240px;
  --fg-gutter:clamp(16px,4vw,48px);
  --fg-radius:2px;
  --fg-shadow-hard:6px 6px 0 rgba(108,43,217,.85);
  --fg-shadow-cyan:6px 6px 0 rgba(34,230,230,.3);
}

/* ---------- 3. 基底与中文排版 ---------- */
body{
  min-height:100vh;
  background-color:var(--fg-void);
  background-image:
    radial-gradient(120% 78% at 50% -12%, rgba(108,43,217,.42) 0%, rgba(108,43,217,0) 62%),
    radial-gradient(64% 46% at 92% 6%, rgba(34,230,230,.10) 0%, rgba(34,230,230,0) 72%),
    linear-gradient(0deg, rgba(156,147,184,.06) 0 1px, transparent 1px 96px),
    linear-gradient(90deg, rgba(156,147,184,.06) 0 1px, transparent 1px 96px);
  background-attachment:fixed;
  color:var(--fg-ice);
  font-family:var(--fg-font-body);
  font-size:16.5px;
  font-weight:400;
  line-height:1.75;
  letter-spacing:.01em;
  overflow-x:hidden;
}
p{max-width:78ch}
p+p{margin-top:1.2em}
strong,b{font-weight:700;color:#fff}
em{font-style:normal;color:var(--fg-cyan)}
::selection{background:var(--fg-pink);color:#0B0410}
:focus-visible{outline:2px solid var(--fg-cyan);outline-offset:3px}

.display-1,.display-2,.display-3{
  font-family:var(--fg-font-display);
  font-weight:900;
  line-height:1.04;
  letter-spacing:-.02em;
  color:#fff;
}
.display-1{font-size:clamp(40px,7.6vw,84px)}
.display-2{font-size:clamp(30px,4.8vw,56px)}
.display-3{font-size:clamp(24px,3.2vw,40px)}
.glow{text-shadow:0 0 12px rgba(34,230,230,.5),0 0 34px rgba(168,85,247,.4)}
.lead{font-size:clamp(16px,1.4vw,18.5px);color:var(--fg-mist);max-width:62ch;line-height:1.8}
.muted{color:var(--fg-mist)}
.mono{
  font-family:var(--fg-font-index);
  font-size:.86em;
  letter-spacing:.08em;
  text-transform:uppercase;
  font-weight:500;
}
.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--fg-font-index);font-size:12.5px;
  letter-spacing:.2em;text-transform:uppercase;color:var(--fg-cyan);
}
.eyebrow::before{content:"";width:28px;height:2px;background:var(--fg-cyan);box-shadow:0 0 10px var(--fg-cyan)}
.prose{max-width:74ch;color:var(--fg-mist)}
.prose h2,.prose h3{color:var(--fg-ice);margin:1.6em 0 .6em;font-weight:700}
.prose h2{font-size:clamp(22px,2.4vw,30px)}
.prose h3{font-size:clamp(18px,1.8vw,22px)}
.prose ul{display:flex;flex-direction:column;gap:.5em;margin:1em 0}
.prose li{padding-left:1.4em;position:relative}
.prose li::before{content:"";position:absolute;left:0;top:.72em;width:8px;height:2px;background:var(--fg-cyan)}
.visually-hidden{
  position:absolute!important;width:1px;height:1px;padding:0;margin:-1px;
  overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0;
}

/* ---------- 4. 布局 ---------- */
.wrap{width:min(100% - (var(--fg-gutter) * 2), var(--fg-wrap));margin-inline:auto}
.section{position:relative;padding-block:clamp(52px,7.5vw,112px)}
.section--tight{padding-block:clamp(34px,4.6vw,64px)}
.section--night{background:var(--fg-night);border-block:1px solid var(--fg-line)}
.section-head{display:flex;flex-direction:column;gap:14px;margin-bottom:clamp(24px,3.4vw,46px)}
.section-head--split{flex-direction:row;align-items:flex-end;justify-content:space-between;gap:24px;flex-wrap:wrap}
.grid{display:grid;gap:clamp(16px,2.4vw,32px)}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--split{grid-template-columns:minmax(0,5fr) minmax(0,3fr)}
.grid--split-r{grid-template-columns:minmax(0,3fr) minmax(0,5fr)}

/* ---------- 5. 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:10px;
  min-height:48px;padding:13px 26px;
  font-family:var(--fg-font-index);font-size:13.5px;font-weight:700;
  letter-spacing:.08em;text-transform:uppercase;
  color:var(--fg-ice);background:transparent;
  border:2px solid var(--fg-ice);border-radius:var(--fg-radius);
  transition:transform .18s ease,box-shadow .18s ease,background-color .18s ease,
             color .18s ease,border-color .18s ease;
}
.btn-arrow{font-size:15px;line-height:1}
.btn:hover{transform:translate(2px,2px)}
.btn:active{box-shadow:inset 0 2px 0 rgba(0,0,0,.65),inset 0 0 0 1px rgba(0,0,0,.35)}
.btn--cta{
  background:var(--fg-orange);border-color:var(--fg-orange);color:#180602;
  box-shadow:5px 5px 0 rgba(108,43,217,.9);
}
.btn--cta:hover{background:var(--fg-ember);border-color:var(--fg-ember);box-shadow:3px 3px 0 rgba(108,43,217,.9)}
.btn--purple{
  background:linear-gradient(135deg,var(--fg-purple),var(--fg-violet));
  border-color:transparent;color:#fff;box-shadow:5px 5px 0 rgba(34,230,230,.28);
}
.btn--purple:hover{box-shadow:3px 3px 0 rgba(34,230,230,.28)}
.btn--ghost{border-color:var(--fg-line-strong);color:var(--fg-ice)}
.btn--ghost:hover{border-color:var(--fg-cyan);color:var(--fg-cyan);box-shadow:4px 4px 0 rgba(34,230,230,.22)}
.btn--sm{min-height:38px;padding:8px 16px;font-size:12px}

/* ---------- 6. 标签 ---------- */
.tag-row{display:flex;flex-wrap:wrap;gap:8px}
.chip{
  display:inline-flex;align-items:center;gap:8px;
  padding:5px 12px;border:1px solid var(--fg-line);border-radius:var(--fg-radius);
  font-family:var(--fg-font-index);font-size:12px;font-weight:500;
  letter-spacing:.1em;text-transform:uppercase;color:var(--fg-mist);
  background:rgba(156,147,184,.05);
}
.chip--cyan{border-color:rgba(34,230,230,.55);color:var(--fg-cyan);background:var(--fg-cyan-soft)}
.chip--pink{border-color:rgba(255,46,136,.55);color:var(--fg-pink);background:var(--fg-pink-soft)}
.chip--orange{border-color:rgba(255,106,26,.55);color:var(--fg-ember);background:rgba(255,106,26,.12)}
.chip--solid{border-color:var(--fg-purple);background:var(--fg-purple);color:#fff}

/* ---------- 7. 面包屑 ---------- */
.breadcrumb{
  padding-block:18px;color:var(--fg-mist);
  font-family:var(--fg-font-index);font-size:12.5px;letter-spacing:.08em;
}
.breadcrumb ol{display:flex;flex-wrap:wrap;align-items:center;gap:0}
.breadcrumb li{display:flex;align-items:center}
.breadcrumb li+li::before{content:"/";margin:0 10px;color:var(--fg-line-strong)}
.breadcrumb a{transition:color .18s ease}
.breadcrumb a:hover{color:var(--fg-cyan)}
.breadcrumb [aria-current="page"]{color:var(--fg-ice)}

/* ---------- 8. 卡片 ---------- */
.card{
  position:relative;display:flex;flex-direction:column;gap:12px;
  padding:clamp(20px,2.8vw,32px);
  background:var(--fg-night);border:2px solid var(--fg-line);
  border-radius:var(--fg-radius);
  transition:border-color .2s ease,transform .2s ease,box-shadow .2s ease;
}
.card:hover{border-color:var(--fg-violet);transform:translateY(-3px);box-shadow:8px 8px 0 rgba(108,43,217,.5)}
.card--accent{border-color:var(--fg-purple);box-shadow:8px 8px 0 rgba(255,46,136,.25)}
.card__title{font-family:var(--fg-font-display);font-weight:900;font-size:clamp(19px,2vw,25px);line-height:1.25;color:#fff}
.card__meta{font-family:var(--fg-font-index);font-size:12px;letter-spacing:.12em;text-transform:uppercase;color:var(--fg-cyan)}
.card p{color:var(--fg-mist);font-size:15.5px}

/* ---------- 9. 图片容器（页面阶段放图） ---------- */
.media{
  position:relative;display:block;overflow:hidden;
  aspect-ratio:16/9;border:2px solid var(--fg-line);border-radius:var(--fg-radius);
  background:
    linear-gradient(135deg,rgba(108,43,217,.42) 0%,rgba(5,4,10,.92) 70%),
    var(--fg-night);
}
.media img{width:100%;height:100%;object-fit:cover}
.media::after{
  content:"";position:absolute;inset:0;pointer-events:none;opacity:.45;
  background:
    repeating-linear-gradient(90deg,rgba(34,230,230,.12) 0 1px,transparent 1px 30px),
    repeating-linear-gradient(0deg,rgba(34,230,230,.12) 0 1px,transparent 1px 30px);
}
.media--wide{aspect-ratio:21/9}
.media--square{aspect-ratio:1/1}
.media--tall{aspect-ratio:3/4}
.media__caption{
  margin-top:10px;font-family:var(--fg-font-index);font-size:12.5px;
  letter-spacing:.06em;color:var(--fg-mist);
}

/* ---------- 10. 折叠组 ---------- */
.accordion{display:flex;flex-direction:column;gap:12px}
.accordion details{
  position:relative;overflow:hidden;
  background:var(--fg-night);border:2px solid var(--fg-line);border-radius:var(--fg-radius);
  transition:border-color .2s ease;
}
.accordion details:hover{border-color:var(--fg-line-strong)}
.accordion details[open]{border-color:var(--fg-violet)}
.accordion details[open]::after{
  content:"";position:absolute;left:0;top:0;bottom:0;width:4px;
  background:var(--fg-pink);box-shadow:0 0 14px var(--fg-pink);
}
.accordion summary{
  position:relative;display:flex;align-items:center;gap:12px;
  padding:18px 22px 18px 46px;cursor:pointer;
  font-weight:700;font-size:17px;color:var(--fg-ice);list-style:none;
}
.accordion summary::-webkit-details-marker{display:none}
.accordion summary::before{
  content:"+";position:absolute;left:18px;
  font-family:var(--fg-font-index);font-size:18px;color:var(--fg-cyan);
}
.accordion details[open] summary::before{content:"−";color:var(--fg-pink)}
.accordion__body{padding:0 22px 22px 46px;color:var(--fg-mist);font-size:15.5px}

/* ---------- 11. 筛选条 ---------- */
.filterbar{display:flex;flex-wrap:wrap;gap:10px}
.filterbar [data-filter]{
  padding:9px 16px;border:1px solid var(--fg-line);border-radius:var(--fg-radius);
  font-family:var(--fg-font-index);font-size:12.5px;font-weight:500;
  letter-spacing:.1em;text-transform:uppercase;color:var(--fg-mist);
  transition:border-color .18s ease,color .18s ease,background-color .18s ease;
}
.filterbar [data-filter]:hover{border-color:var(--fg-cyan);color:var(--fg-cyan)}
.filterbar [data-filter][aria-pressed="true"]{
  background:var(--fg-cyan);border-color:var(--fg-cyan);color:#04121A;font-weight:700;
}
.is-hidden{display:none!important}

/* ---------- 12. 跳动与显现 ---------- */
.skip-link{
  position:absolute;left:16px;top:-70px;z-index:200;
  padding:10px 18px;border-radius:var(--fg-radius);
  background:var(--fg-cyan);color:#04121A;
  font-family:var(--fg-font-index);font-size:13px;font-weight:700;letter-spacing:.08em;
  transition:top .2s ease;
}
.skip-link:focus{top:12px}
html.has-js [data-reveal]{
  opacity:0;transform:translateY(18px);
  transition:opacity .6s ease,transform .6s cubic-bezier(.2,.8,.2,1);
}
html.has-js [data-reveal].is-in{opacity:1;transform:none}

/* =========================================================
   13. 页头
   ========================================================= */
.site-header{
  position:sticky;top:0;z-index:90;
  background:linear-gradient(180deg,rgba(5,4,10,.99) 0%,rgba(18,16,31,.94) 100%);
  border-bottom:1px solid var(--fg-line);
  backdrop-filter:blur(8px);
  transition:box-shadow .3s ease;
}
.site-header[data-stuck]{box-shadow:0 14px 34px rgba(0,0,0,.72)}

/* 13.1 顶部坐标索引条 */
.hud{
  border-bottom:1px solid var(--fg-line);
  background:rgba(5,4,10,.72);
  font-family:var(--fg-font-index);font-size:11.5px;font-weight:500;
  letter-spacing:.14em;text-transform:uppercase;color:var(--fg-mist);
}
.hud-inner{
  width:min(100% - (var(--fg-gutter) * 2), var(--fg-wrap));margin-inline:auto;
  display:flex;align-items:center;justify-content:space-between;
  gap:12px 20px;flex-wrap:wrap;min-height:36px;
}
.hud-cell{display:inline-flex;align-items:center;gap:8px;white-space:nowrap}
.hud-dot{width:7px;height:7px;background:var(--fg-pink);box-shadow:0 0 10px var(--fg-pink)}
.hud-coord{color:var(--fg-cyan)}
.hud-tel{color:var(--fg-mist)}

/* 13.2 居中报头 */
.masthead{border-bottom:1px solid var(--fg-line)}
.masthead-inner{
  width:min(100% - (var(--fg-gutter) * 2), var(--fg-wrap));margin-inline:auto;
  display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:18px;
  padding-block:clamp(14px,2vw,26px);
  transition:padding .3s ease;
}
.masthead-note{
  font-family:var(--fg-font-index);font-size:12px;font-weight:500;
  letter-spacing:.16em;text-transform:uppercase;color:var(--fg-mist);
}
.masthead-cta{grid-column:3;grid-row:1;justify-self:end}
.brand{
  grid-column:2;grid-row:1;justify-self:center;
  display:inline-flex;align-items:center;gap:14px;
}
.brand-mark{
  display:grid;place-items:center;flex:none;
  width:46px;height:46px;
  background:linear-gradient(135deg,var(--fg-purple),var(--fg-pink));
  border:2px solid rgba(34,230,230,.6);
  color:#fff;font-family:var(--fg-font-index);font-size:15px;font-weight:700;letter-spacing:.06em;
  box-shadow:4px 4px 0 rgba(34,230,230,.35);
  transition:width .25s ease,height .25s ease,box-shadow .25s ease;
}
.brand-text{display:block;text-align:center}
.brand-name{
  display:block;font-family:var(--fg-font-display);font-weight:900;
  font-size:clamp(24px,3.4vw,40px);line-height:1.05;letter-spacing:.02em;color:#fff;
  text-shadow:0 0 16px rgba(168,85,247,.55);
  transition:font-size .25s ease,text-shadow .25s ease;
}
.brand-sub{
  display:block;margin-top:6px;
  font-family:var(--fg-font-index);font-size:11px;letter-spacing:.32em;color:var(--fg-cyan);
}

/* 13.3 栏目索引 */
.site-nav{position:relative}
.nav-list{
  width:min(100% - (var(--fg-gutter) * 2), var(--fg-wrap));margin-inline:auto;
  display:flex;align-items:stretch;justify-content:center;flex-wrap:wrap;
}
.nav-item{border-left:1px solid var(--fg-line)}
.nav-item:last-child{border-right:1px solid var(--fg-line)}
.nav-link{
  position:relative;display:flex;align-items:center;gap:9px;
  padding:14px clamp(12px,1.8vw,24px);
  font-size:15px;font-weight:500;color:var(--fg-ice);white-space:nowrap;
  transition:color .2s ease,background-color .2s ease;
}
.nav-link::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:2px;
  background:linear-gradient(90deg,var(--fg-cyan),var(--fg-pink));
  transform:scaleX(0);transform-origin:left center;
  transition:transform .3s cubic-bezier(.2,.8,.2,1);
}
.nav-link:hover::after,
.nav-link:focus-visible::after,
.nav-link[aria-current="page"]::after{transform:scaleX(1)}
.nav-idx{
  font-family:var(--fg-font-index);font-size:11px;font-weight:500;
  letter-spacing:.1em;color:var(--fg-mist);transition:color .2s ease;
}
.nav-label{transition:transform .24s ease}
.nav-link:hover{color:#fff}
.nav-link:hover .nav-idx{color:var(--fg-cyan)}
.nav-link:hover .nav-label{transform:translateX(4px)}
.nav-link[aria-current="page"]{background:rgba(108,43,217,.38);color:#fff}
.nav-link[aria-current="page"] .nav-idx{color:var(--fg-pink)}
.nav-link[aria-current="page"] .nav-idx::before{
  content:"";display:inline-block;width:7px;height:7px;margin-right:8px;
  background:var(--fg-pink);box-shadow:0 0 10px var(--fg-pink);vertical-align:middle;
}
.nav-cta{display:none}

/* 13.4 移动菜单按钮 */
.nav-toggle{
  display:none;align-items:center;gap:10px;
  grid-column:3;grid-row:1;justify-self:end;
  padding:10px 14px;border:2px solid var(--fg-line);border-radius:var(--fg-radius);
  background:var(--fg-night);color:var(--fg-ice);
  font-family:var(--fg-font-index);font-size:12.5px;font-weight:700;
  letter-spacing:.12em;transition:border-color .2s ease,color .2s ease;
}
.nav-toggle:hover{border-color:var(--fg-cyan);color:var(--fg-cyan)}
.nav-toggle__bars{display:inline-flex;flex-direction:column;gap:4px}
.nav-toggle__bars i{display:block;width:18px;height:2px;background:currentColor;transition:transform .2s ease,opacity .2s ease}
.nav-toggle[aria-expanded="true"]{border-color:var(--fg-pink);color:var(--fg-pink)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(1){transform:translateY(6px) 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(-6px) rotate(-45deg)}

/* 13.5 滚动刻度 */
.scroll-rail{
  position:absolute;left:0;right:0;bottom:0;height:3px;
  background:rgba(156,147,184,.16);overflow:hidden;
}
.scroll-rail i{
  display:block;width:100%;height:100%;
  transform:scaleX(0);transform-origin:left center;
  background:linear-gradient(90deg,var(--fg-cyan),var(--fg-pink),var(--fg-orange));
}

/* 13.6 压缩态 */
.site-header[data-stuck] .hud{display:none}
.site-header[data-stuck] .masthead-inner{padding-block:8px}
.site-header[data-stuck] .brand-name{font-size:20px;text-shadow:none}
.site-header[data-stuck] .brand-sub{display:none}
.site-header[data-stuck] .brand-mark{width:30px;height:30px;font-size:11px;box-shadow:none}
.site-header[data-stuck] .masthead-cta .btn{min-height:36px;padding:7px 15px;font-size:11.5px}
.site-header[data-stuck] .nav-link{padding-block:10px}

/* =========================================================
   14. 页脚
   ========================================================= */
.site-footer{
  position:relative;margin-top:clamp(48px,7vw,96px);
  background:linear-gradient(180deg,var(--fg-night) 0%,#0A0814 58%,var(--fg-void) 100%);
  border-top:2px solid var(--fg-purple);
  color:var(--fg-ice);
}
.site-footer::before{
  content:"";position:absolute;left:0;right:0;top:-2px;height:2px;
  background:linear-gradient(90deg,var(--fg-purple),var(--fg-pink),var(--fg-orange),var(--fg-cyan));
}
.footer-main{
  position:relative;
  display:grid;grid-template-columns:minmax(0,1.15fr) minmax(0,3fr);
  gap:clamp(24px,4vw,64px);
  padding-block:clamp(40px,6vw,72px);
  padding-left:clamp(20px,3vw,40px);
}
.footer-axis{
  position:absolute;left:0;top:0;bottom:0;width:2px;
  background:linear-gradient(180deg,rgba(34,230,230,0) 0%,var(--fg-cyan) 14%,var(--fg-cyan) 86%,rgba(34,230,230,0) 100%);
  box-shadow:0 0 14px rgba(34,230,230,.55);
}
.footer-brand{display:flex;flex-direction:column;gap:16px}
.brand--sm{justify-self:start}
.brand--sm .brand-mark{width:40px;height:40px;font-size:13px}
.brand--sm .brand-name{font-size:22px;text-shadow:0 0 12px rgba(168,85,247,.45)}
.brand--sm .brand-sub{font-size:10px;letter-spacing:.26em}
.footer-line{
  font-family:var(--fg-font-display);font-weight:700;font-size:18px;
  line-height:1.55;color:var(--fg-ice);
}
.footer-facts{display:flex;flex-direction:column;gap:8px;font-family:var(--fg-font-index);font-size:12px;letter-spacing:.08em;color:var(--fg-mist)}
.footer-facts b{font-weight:500;color:var(--fg-cyan);margin-right:6px}

.footer-cols{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:clamp(18px,2.4vw,32px)}
.footer-col-title{
  display:flex;align-items:center;gap:8px;
  padding-bottom:12px;margin-bottom:14px;border-bottom:1px solid var(--fg-line);
  font-family:var(--fg-font-index);font-size:12px;font-weight:500;
  letter-spacing:.16em;text-transform:uppercase;color:var(--fg-cyan);
}
.footer-col-title::before{content:"";width:6px;height:6px;background:var(--fg-pink)}
.footer-col ul{display:flex;flex-direction:column;gap:10px}
.footer-col a{
  position:relative;display:inline-block;
  font-size:14.5px;color:var(--fg-mist);
  transition:color .18s ease,padding-left .18s ease;
}
.footer-col a:hover{color:var(--fg-ice);padding-left:12px}
.footer-col a:hover::before{
  content:"";position:absolute;left:0;top:.78em;
  width:6px;height:2px;background:var(--fg-cyan);
}

.footer-contact{
  border-top:1px solid var(--fg-line);border-bottom:1px solid var(--fg-line);
  background:rgba(34,230,230,.035);
}
.footer-contact-inner{
  display:grid;grid-template-columns:repeat(4,minmax(0,1fr));
  gap:18px;padding-block:22px;
}
.contact-cell dt{
  margin-bottom:6px;font-family:var(--fg-font-index);font-size:11px;font-weight:500;
  letter-spacing:.16em;text-transform:uppercase;color:var(--fg-cyan);
}
.contact-cell dd{font-size:14.5px;line-height:1.6;color:var(--fg-ice)}

.footer-legal{
  font-family:var(--fg-font-index);font-size:12px;letter-spacing:.06em;color:var(--fg-mist);
}
.footer-legal .wrap{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:12px 24px;padding-block:20px;
}
.legal-copy{max-width:none}
.legal-links{display:flex;flex-wrap:wrap;gap:18px}
.legal-links a{transition:color .18s ease}
.legal-links a:hover{color:var(--fg-cyan);text-decoration:underline}

/* =========================================================
   15. 响应式
   ========================================================= */
@media (max-width:1100px){
  .footer-main{grid-template-columns:1fr;gap:32px}
  .footer-cols{grid-template-columns:repeat(2,minmax(0,1fr));gap:24px}
  .footer-contact-inner{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:959px){
  .masthead-inner{grid-template-columns:1fr auto;gap:12px;padding-block:14px}
  .masthead-note{display:none}
  .brand{grid-column:1;grid-row:1;justify-self:start;gap:10px}
  .masthead-cta{display:none}
  .nav-toggle{display:inline-flex}
  .brand-mark{width:38px;height:38px;font-size:12px}
  .brand-text{text-align:left}
  .brand-name{font-size:clamp(19px,5.4vw,25px)}
  .brand-sub{font-size:10px;letter-spacing:.22em;margin-top:3px}

  .site-nav{
    display:none;
    position:absolute;left:0;right:0;top:100%;
    background:rgba(5,4,10,.99);
    border-top:1px solid var(--fg-line);
    border-bottom:3px solid var(--fg-purple);
    box-shadow:0 22px 44px rgba(0,0,0,.7);
    max-height:min(76vh,560px);overflow-y:auto;
  }
  .site-nav[data-open]{display:block}
  .nav-list{width:100%;flex-direction:column;flex-wrap:nowrap;justify-content:flex-start}
  .nav-item{border-left:0;border-bottom:1px solid var(--fg-line)}
  .nav-item:last-child{border-right:0;border-bottom:0}
  .nav-link{padding:16px var(--fg-gutter);font-size:16px}
  .nav-link::after{bottom:0}
  .nav-idx{font-size:12px}
  .nav-cta{display:block;padding:16px var(--fg-gutter) 22px}
  .nav-cta .btn{width:100%}

  .grid--2,.grid--3,.grid--split,.grid--split-r{grid-template-columns:minmax(0,1fr)}
}
@media (max-width:700px){
  body{font-size:16px}
  .hud-inner{font-size:10.5px;letter-spacing:.1em}
  .hud-host{display:none}
  .footer-contact-inner{grid-template-columns:minmax(0,1fr)}
}
@media (max-width:560px){
  .footer-cols{grid-template-columns:minmax(0,1fr)}
  .footer-main{padding-left:18px}
  .brand-name{font-size:19px}
  .btn{width:100%}
  .btn--sm,.nav-toggle{width:auto}
}

/* =========================================================
   16. 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;
  }
  html.has-js [data-reveal]{opacity:1;transform:none}
  .card:hover,.btn:hover{transform:none}
}