:root{
  --bg:#ffffff;
  --ink:#141414;
  --ink-soft:#3d3d3d;
  --muted:#8a8a8a;
  --line:#e4e4e4;
  --line-strong:#c9c9c9;
  --wash:#fafafa;
  --radius:6px;
  --pad:clamp(20px,4.5vw,64px);
}
*{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;}
body{
  margin:0;background:var(--bg);color:var(--ink);
  font-family:"Inter","Helvetica Neue","Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  font-size:16px;line-height:1.7;-webkit-font-smoothing:antialiased;
}
img{max-width:100%;}
a{color:inherit;text-decoration:none;}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer;}
.wrap{max-width:1440px;margin:0 auto;padding:0 var(--pad);}
.site-head{display:flex;align-items:center;justify-content:space-between;gap:24px;padding-top:30px;padding-bottom:26px;}
.brand{display:flex;align-items:center;gap:18px;min-width:0;}
.marque{
  width:110px;height:74px;flex:0 0 110px;
  display:flex;align-items:center;justify-content:center;overflow:visible;
}
.marque svg{
  width:100%;height:auto;display:block;
  fill:none;stroke:var(--ink);stroke-width:1.95;
  stroke-linecap:butt;stroke-linejoin:miter;
}
.sr-only{
  position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;
  clip:rect(0 0 0 0);white-space:nowrap;border:0;
}
.brand-meta{display:flex;flex-direction:column;gap:2px;min-width:0;}
.brand-meta .cn{font-size:15px;font-weight:600;}
.brand-meta .en{font-size:11px;color:var(--muted);}
.site-nav{display:flex;align-items:center;gap:26px;font-size:13px;color:var(--ink-soft);}
.site-nav a{padding-bottom:2px;border-bottom:1px solid transparent;transition:border-color .2s ease,color .2s ease;}
.site-nav a:hover{border-color:var(--ink);color:var(--ink);}
.hero{padding-top:26px;padding-bottom:34px;}
.eyebrow{font-size:11px;color:var(--muted);text-transform:uppercase;margin:0 0 10px;}
.hero h1{margin:0 0 14px;font-size:clamp(22px,2.6vw,34px);font-weight:600;line-height:1.35;max-width:26ch;}
.hero p.lede{margin:0;color:var(--ink-soft);font-size:14px;max-width:62ch;}
.circles{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:clamp(14px,2vw,30px);margin:44px 0 10px;}
.circle{
  position:relative;aspect-ratio:1/1;border-radius:50%;border:1px solid var(--line-strong);
  background:var(--bg);display:flex;flex-direction:column;align-items:center;justify-content:center;
  text-align:center;padding:15%;cursor:pointer;
  transition:border-color .25s ease,background .25s ease,transform .25s ease;
}
.circle:hover,.circle:focus-visible{border-color:var(--ink);background:var(--wash);transform:translateY(-4px);outline:none;}
.circle .num{font-size:11px;color:var(--muted);margin-bottom:9px;letter-spacing:.06em;}
.circle .zh{
  font-size:clamp(13px,1.35vw,17px);font-weight:600;line-height:1.4;max-width:12ch;
  text-wrap:balance;
}
.circles-hint{
  margin:26px 0 0;text-align:center;font-size:12.5px;color:var(--muted);
  letter-spacing:.02em;
}
.circle .en{
  font-size:clamp(9px,.72vw,11px);color:var(--muted);line-height:1.35;margin-top:7px;
  max-width:15ch;letter-spacing:.01em;
}
.rule{height:1px;background:var(--line);margin:64px 0 0;}
.section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;padding:46px 0 26px;flex-wrap:wrap;}
.section-head h2{margin:0;font-size:clamp(19px,2vw,26px);font-weight:600;}
.section-head .meta{font-size:12px;color:var(--muted);}
.masonry{columns:3;column-gap:26px;}
.masonry figure{margin:0 0 26px;break-inside:avoid;}
.grid4{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:26px;}
.grid4 figure{margin:0;}
.grid-pairs{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:26px;}
.grid-pairs figure{margin:0;}
.grid-pairs .span2{grid-column:1 / -1;}
.group-label{
  margin:34px 0 14px;font-size:11px;color:var(--muted);text-transform:uppercase;letter-spacing:.14em;
}
.masonry img,.feature img{
  display:block;width:100%;height:auto;border-radius:2px;background:var(--wash);transition:opacity .3s ease;
}
.masonry figure:hover img,.feature figure:hover img{opacity:.92;}
figcaption{margin-top:9px;font-size:11.5px;color:var(--muted);}
.panel{position:fixed;inset:0;z-index:70;background:var(--bg);overflow-y:auto;overscroll-behavior:contain;display:none;}
.panel.open{display:block;}
.panel-head{position:sticky;top:0;z-index:2;background:rgba(255,255,255,.94);backdrop-filter:saturate(180%) blur(8px);border-bottom:1px solid var(--line);}
.panel-head .inner{display:flex;align-items:center;justify-content:space-between;gap:20px;padding-top:16px;padding-bottom:16px;}
.back{
  display:inline-flex;align-items:center;gap:10px;font-size:13px;color:var(--ink-soft);
  border:1px solid var(--line-strong);border-radius:999px;padding:9px 16px 9px 13px;
  transition:border-color .2s ease,color .2s ease,background .2s ease;
}
.back:hover{border-color:var(--ink);color:var(--ink);background:var(--wash);}
.panel-head .tag{font-size:11px;color:var(--muted);text-transform:uppercase;}
.panel-body{padding-top:44px;padding-bottom:96px;}
.panel-title{margin:0 0 8px;font-size:clamp(22px,2.6vw,34px);font-weight:600;line-height:1.3;}
.panel-sub{margin:0 0 30px;color:var(--ink-soft);font-size:14px;max-width:70ch;}
.frame{width:100%;height:calc(100vh - 250px);min-height:560px;border:1px solid var(--line);border-radius:var(--radius);background:var(--bg);}
.shot{margin:0;}
.scroll-hint{margin:12px 0 0;font-size:12px;color:var(--muted);}
.shot img{display:block;width:100%;height:auto;border:1px solid var(--line);border-radius:var(--radius);}
.shot img.zoomable{cursor:zoom-in;}
.actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:22px;}
.btn{
  display:inline-flex;align-items:center;gap:9px;font-size:13px;
  border:1px solid var(--ink);border-radius:999px;padding:11px 20px;transition:background .2s ease,color .2s ease;
}
.btn:hover{background:var(--ink);color:#fff;}
.btn.ghost{border-color:var(--line-strong);}
.btn.ghost:hover{background:var(--ink);border-color:var(--ink);color:#fff;}
.panel-foot{display:flex;align-items:center;justify-content:space-between;gap:16px;border-top:1px solid var(--line);margin-top:48px;padding-top:22px;}
.stepnav{display:flex;align-items:center;gap:14px;font-size:13px;color:var(--ink-soft);}
.stepnav a{display:inline-flex;align-items:center;gap:8px;border-bottom:1px solid transparent;}
.stepnav a:hover{border-color:var(--ink);color:var(--ink);}
.linkcard{display:flex;align-items:center;justify-content:space-between;gap:28px;flex-wrap:wrap;border:1px solid var(--line);border-radius:var(--radius);padding:28px 30px;background:var(--wash);}
.linkcard .lc-text{min-width:0;}
.linkcard h3{margin:0 0 6px;font-size:17px;font-weight:600;}
.linkcard p{margin:0;font-size:13px;color:var(--ink-soft);word-break:break-all;}
.site-foot{border-top:1px solid var(--line);margin-top:70px;padding-top:30px;padding-bottom:46px;display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap;font-size:12px;color:var(--muted);}

/* ---------- contact ---------- */
.contact{border-top:1px solid var(--line);margin-top:64px;padding-top:56px;padding-bottom:10px;text-align:center;}
.contact-kicker{margin:0 0 12px;font-size:11px;color:var(--muted);text-transform:uppercase;letter-spacing:.14em;}
.contact h2{margin:0 0 12px;font-size:clamp(24px,3.2vw,40px);font-weight:600;line-height:1.25;letter-spacing:.01em;}
.contact-sub{margin:0 auto;max-width:56ch;color:var(--ink-soft);font-size:14px;}
.contact-line{
  margin:30px 0 0;display:flex;flex-wrap:wrap;justify-content:center;align-items:baseline;
  gap:10px;font-size:14.5px;color:var(--ink);
}
.contact-line i{font-style:normal;color:var(--line-strong);}
.contact-line a{border-bottom:1px solid var(--line-strong);}
.contact-line a:hover{border-color:var(--ink);}
.contact-actions{display:flex;justify-content:center;gap:12px;flex-wrap:wrap;margin-top:30px;}
.reveal{opacity:0;transform:translateY(14px);transition:opacity .6s ease,transform .6s ease;}
.reveal.in{opacity:1;transform:none;}

/* ---------- lightbox ---------- */
.lightbox{
  position:fixed;inset:0;z-index:90;background:rgba(255,255,255,.97);
  display:none;flex-direction:column;
}
.lightbox.open{display:flex;}
.lb-bar{
  display:flex;align-items:center;justify-content:space-between;gap:18px;
  padding:14px var(--pad);border-bottom:1px solid var(--line);flex:0 0 auto;
}
.lb-name{font-size:13px;color:var(--ink-soft);min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;}
.lb-tools{display:flex;align-items:center;gap:10px;flex:0 0 auto;}
.lb-btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;font-size:12.5px;
  border:1px solid var(--line-strong);border-radius:999px;min-width:40px;height:40px;padding:0 14px;
  transition:border-color .2s ease,background .2s ease,color .2s ease;
}
.lb-btn:hover{border-color:var(--ink);background:var(--ink);color:#fff;}
.lb-stage{
  flex:1 1 auto;overflow:auto;padding:24px var(--pad) 60px;
  display:flex;justify-content:center;align-items:flex-start;
}
.lb-stage img{
  display:block;max-width:none;height:auto;border:1px solid var(--line);background:var(--bg);
}
.lb-stage.fit img{max-width:100%;}
.lb-count{font-size:12px;color:var(--muted);}
@media (max-width:1080px){
  .circles{grid-template-columns:repeat(3,minmax(0,1fr));}
  .masonry{columns:2;}
  .grid4{grid-template-columns:repeat(2,minmax(0,1fr));}
  .grid-pairs{gap:18px;}
}
@media (max-width:760px){
  .site-head{padding-top:16px;padding-bottom:14px;flex-wrap:wrap;row-gap:12px;}
  .brand{flex:1 1 100%;gap:12px;}
  .brand-meta .cn{font-size:13.5px;}
  .brand-meta .en{font-size:10px;}
  .site-nav{gap:18px;font-size:12px;flex:1 1 100%;justify-content:space-between;}
  .marque{width:82px;height:56px;flex-basis:82px;}
  .marque svg{stroke-width:2.4;}
  .hero{padding-top:18px;padding-bottom:22px;}
  .hero h1{font-size:21px;}
  .hero p.lede{font-size:13px;}
  .circles{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin-top:22px;}
  .circle{max-width:152px;justify-self:center;}
  .rule{margin-top:38px;}
  .section-head{padding-top:30px;}
  .circle .zh{font-size:14px;}
  .circle .en{font-size:9px;max-width:14ch;margin-top:5px;}
  .circle .num{margin-bottom:6px;}
  .frame{height:calc(100vh - 210px);min-height:440px;}
  .panel-body{padding-top:30px;padding-bottom:70px;}
  .masonry{columns:1;}
  .grid4{grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;}
  .grid-pairs{grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;}
  .linkcard{padding:22px 20px;}
  .contact{margin-top:44px;padding-top:40px;}
  .contact-line{gap:8px;font-size:13.5px;margin-top:24px;}
}
@media (prefers-reduced-motion:reduce){
  *{transition:none!important;animation:none!important;}
  .reveal{opacity:1;transform:none;}
}