:root{
  --bg:#f4f6f8;
  --ink:#15202b;
  --mute:#5d6b78;
  --line:#d7dee6;
  --acc:#1a73e8;
  --bad:#9aa5b1;
  --good:#0f7b4a;
  --card:#fff;
  --max:1120px;
}
*{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% - 28px));margin:auto}
nav{
  position:sticky;top:0;z-index:20;background:rgba(244,246,248,.94);
  backdrop-filter:blur(8px);border-bottom:1px solid var(--line);
}
.nav{display:flex;align-items:center;justify-content:space-between;gap:16px;min-height:60px}
.brand{font-weight:800}
.brand b{color:var(--acc)}
.links{display:flex;gap:16px;color:var(--mute);font-size:14px}
.button{
  display:inline-flex;align-items:center;justify-content:center;
  min-height:40px;padding:0 16px;border:0;border-radius:6px;
  font-weight:700;color:#fff;background:var(--acc);
}
.button.ghost{background:#fff;color:var(--ink);border:1px solid var(--line)}
.hero{padding:40px 0 12px}
.kicker{font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:var(--acc);margin-bottom:8px}
h1,h2,h3{margin:0 0 10px;line-height:1.25}
h1{font-size:clamp(26px,4vw,42px)}
h2{font-size:clamp(22px,3vw,32px)}
p,.lead{color:var(--mute);margin:0 0 12px}
.actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:16px}
.compare{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:24px}
.col{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:16px}
.col.before h3{color:var(--bad)}
.col.after h3{color:var(--good)}
.col li{margin:8px 0;color:var(--mute)}
.col.after{border-color:#b7e0cb}
.case{
  display:grid;grid-template-columns:1.1fr .9fr;gap:16px;align-items:center;
  background:var(--card);border:1px solid var(--line);border-radius:14px;padding:18px;margin-top:18px;
}
.case img{width:100%;border-radius:10px;aspect-ratio:16/10;object-fit:cover}
.bars{display:grid;gap:10px}
.bar{background:#eef2f6;border-radius:8px;overflow:hidden;height:10px}
.bar i{display:block;height:100%;background:var(--acc)}
.kpi{display:flex;gap:18px;margin-top:10px;font-size:13px}
.kpi b{display:block;font-size:20px;color:var(--good)}
.section{padding:46px 0}
.head{margin-bottom:16px;max-width:640px}
.grid6,.review-grid,.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.card,.review,.download-card,.article,.scene{
  background:var(--card);border:1px solid var(--line);border-radius:12px;padding:16px;
}
.icon{font-size:12px;color:var(--acc);font-weight:800}
.split,.visual,.faq-layout,.help-layout,.cta-in,.footer{display:grid;gap:18px}
.split,.visual,.faq-layout{grid-template-columns:1fr 1fr;align-items:center}
.split img,.visual img,.shot img{width:100%;border-radius:12px;aspect-ratio:16/10;object-fit:cover}
.scene-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:12px 0 16px}
.scene b{display:block;color:var(--acc);font-size:12px}
.metrics{display:flex;gap:20px;margin:14px 0}
.metrics b{display:block;font-size:22px;color:var(--acc)}
.person{margin-top:8px}
.person small{display:block;color:var(--mute)}
details{border-bottom:1px solid var(--line)}
summary{padding:12px 0;font-weight:700;cursor:pointer;list-style:none}
.cta{padding:8px 0 46px}
.cta-in{grid-template-columns:1.3fr auto;align-items:center;padding:22px;border-radius:12px;background:#15202b;color:#fff}
.cta-in p{color:#b7c4d0}
.page-head{padding:36px 0 8px}
.help-layout{grid-template-columns:210px 1fr;align-items:start}
.side{padding:14px;border-radius:12px;background:var(--card);border:1px solid var(--line);position:sticky;top:76px}
.side a{display:block;padding:7px 4px;color:var(--mute)}
.policy{margin-top:12px;padding:14px;border-radius:10px;border:1px solid var(--line)}
footer{padding:36px 0 14px;background:#0f1720;color:#e8eef4}
.footer{grid-template-columns:1.4fr repeat(3,1fr)}
.footer a,.footer p,.copy{color:#9aa8b6}
.footer a{display:block;margin:7px 0}
.copy{margin-top:16px;padding-top:12px;border-top:1px solid #2a3642}
@media(max-width:900px){
  .links{display:none}
  .compare,.case,.split,.visual,.faq-layout,.help-layout,.cta-in,.footer{grid-template-columns:1fr}
  .grid6,.review-grid,.cards,.scene-grid{grid-template-columns:1fr 1fr}
  .side{position:static}
}
@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}}