:root{
  --bg:#f5f6f8;
  --paper:#fff;
  --ink:#1f2933;
  --mute:#5b6773;
  --line:#e3e7ec;
  --acc:#2563eb;
  --max:1160px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;color:var(--ink);background:var(--bg);
  font:16px/1.7 "Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
}
a{color:inherit;text-decoration:none}
img{max-width:100%;height:auto;display:block}
.wrap{width:min(var(--max),calc(100% - 40px));margin:auto}
nav{
  position:sticky;top:0;z-index:20;height:64px;
  background:#fff;border-bottom:1px solid var(--line);
}
.nav{display:grid;height:64px;grid-template-columns:auto 1fr auto;align-items:center;gap:20px}
.brand{display:flex;align-items:center;gap:8px;font-weight:800}
.brand b{width:24px;height:24px;border-radius:6px;display:grid;place-items:center;background:var(--acc);color:#fff;font-size:10px}
.links{display:flex;justify-content:center;gap:20px;font-size:14px;color:var(--mute)}
.button{
  display:inline-flex;align-items:center;justify-content:center;
  min-height:38px;padding:0 16px;border:0;border-radius:8px;font-weight:800;color:#fff;
  background:var(--acc);
}
.button.ghost{background:#fff;color:var(--ink);border:1px solid var(--line)}
.hero{padding:28px 0 48px}
.kb{display:grid;grid-template-columns:220px 1fr;gap:20px;align-items:start}
.toc{padding:16px;background:var(--paper);border:1px solid var(--line);border-radius:12px}
.toc a{display:block;padding:8px 6px;color:var(--mute);font-size:14px;border-radius:6px}
.toc a:hover,.toc .on{background:#eef3ff;color:var(--acc)}
.hero-main{padding:28px;background:var(--paper);border:1px solid var(--line);border-radius:12px}
.eyebrow{color:var(--acc);font-size:12px;font-weight:800;letter-spacing:1.2px}
h1,h2{margin:8px 0 14px;line-height:1.2;font-weight:800}
.hero h1{font-size:clamp(28px,4vw,42px)}
p,.lead{color:var(--mute)}
.actions,.micro{display:flex;flex-wrap:wrap;gap:8px;margin-top:16px}
.micro span,.tag{padding:4px 10px;background:#eef3ff;color:var(--acc);border-radius:999px;font-size:12px}
.portals{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-top:18px}
.portal{padding:14px;border:1px solid var(--line);border-radius:10px}
.portal b{display:block;margin-bottom:4px}
.hero-main img,.shot img,.visual img{width:100%;aspect-ratio:16/9;object-fit:cover;border-radius:10px;margin-top:16px}
.section{padding:56px 0}
.head{max-width:720px;margin-bottom:20px}
.head h2,h2{font-size:clamp(24px,3.4vw,34px)}
.grid6,.review-grid,.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.card,.review,.download-card,.article,.scene{
  padding:16px;background:var(--paper);border:1px solid var(--line);border-radius:12px;
}
.icon{color:var(--acc);font-size:12px;font-weight:800}
.card h3{margin:8px 0 6px}
.split,.visual,.faq-layout,.help-layout,.cta-in,.footer{display:grid;gap:24px}
.split,.visual,.faq-layout{grid-template-columns:1fr 1fr;align-items:center}
.scene-grid{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin:14px 0 18px}
.scene b{display:block;color:var(--acc);font-size:12px}
.visual img{aspect-ratio:16/11;margin:0}
.visual-copy{padding:8px 0 0}
.metrics{display:flex;gap:22px;margin:16px 0 20px}
.metrics b{display:block;color:var(--acc);font-size:24px}
.person{margin-top:10px}
.person small{display:block;color:var(--mute)}
details{border-bottom:1px solid var(--line)}
summary{padding:13px 0;font-weight:800;cursor:pointer;list-style:none}
.cta{padding:8px 0 56px}
.cta-in{grid-template-columns:1fr auto;align-items:center;padding:22px;background:var(--paper);border:1px solid var(--line);border-radius:12px}
.page-head{padding:48px 0 10px}
.help-layout{grid-template-columns:210px 1fr;align-items:start}
.side{padding:14px;background:var(--paper);border:1px solid var(--line);border-radius:12px}
.side a{display:block;padding:8px 4px;color:var(--mute)}
.policy{margin-top:14px;padding:14px;border:1px solid var(--line);border-radius:10px}
.shot{margin:16px 0}
footer{padding:40px 0 12px;background:#1f2933;color:#fff}
.footer{grid-template-columns:1.4fr repeat(3,1fr);align-items:start}
.footer a,.footer p,.copy{color:#c5ced6}
.footer a{display:block;margin:7px 0}
.copy{margin-top:18px;padding-top:10px;border-top:1px solid #334155}
@media(max-width:860px){
  .links{display:none}
  .kb,.split,.visual,.faq-layout,.help-layout,.cta-in,.footer,.portals{grid-template-columns:1fr}
  .grid6,.review-grid,.cards,.scene-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:560px){.grid6,.review-grid,.cards,.scene-grid,.footer{grid-template-columns:1fr}}

@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{animation:none!important;transition:none!important}}