:root{
  --ink:#1a1b1e;
  --mute:#6b6e76;
  --line:#ececec;
  --ui:#fff;
  --bg:#f5f5f4;
  --blue:#2563eb;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:"Segoe UI","PingFang SC","Noto Sans SC",sans-serif;
  background:var(--bg);
  color:var(--ink);
  line-height:1.55;
}
a{color:inherit;text-decoration:none}
img{max-width:100%;height:auto;display:block}
nav{
  position:sticky;top:0;z-index:10;
  display:flex;align-items:center;justify-content:space-between;
  padding:16px 8vw;background:var(--bg);
}
.logo{font-weight:700}
.menu{display:flex;gap:24px;font-size:13px;color:var(--mute)}
.menu a:hover{color:var(--ink)}
.btn{
  display:inline-flex;align-items:center;justify-content:center;
  min-height:36px;padding:0 14px;border-radius:8px;
  background:var(--ink);color:#fff;font-size:13px;font-weight:600;
}
.hero{padding:28px 8vw 56px;text-align:center}
.hero.compact{text-align:left;padding:40px 8vw 32px}
h1{font-size:clamp(22px,3vw,32px);font-weight:650;max-width:18ch;margin:0 auto}
.hero.compact h1{margin:0}
.sub{margin:10px auto 0;max-width:46ch;color:var(--mute)}
.hero.compact .sub{margin-left:0}
.line{margin:12px 0 32px}
.browser{
  max-width:980px;margin:0 auto;text-align:left;
  background:var(--ui);border:1px solid #e5e5e5;border-radius:12px;
  box-shadow:0 24px 60px rgba(26,27,30,.08);
  overflow:hidden;
}
.chrome{
  display:flex;align-items:center;gap:6px;padding:10px 14px;
  background:#f0f0ef;border-bottom:1px solid var(--line);font-size:12px;color:var(--mute);
}
.chrome i{width:8px;height:8px;border-radius:50%;background:#d4d4d4}
.chrome span{margin-left:10px}
.bench{display:grid;grid-template-columns:1fr 1fr}
.col{padding:20px;min-height:320px;border-right:1px solid var(--line)}
.col:last-child{border-right:0;background:#fafafa}
.col h2{font-size:12px;letter-spacing:.14em;color:var(--mute);margin-bottom:14px;font-weight:600}
.bubble{background:#f3f3f2;padding:12px 14px;border-radius:12px;font-size:14px;max-width:36ch}
.bubble.out{background:#e8eefc}
.ok{margin-top:14px;font-size:12px;color:var(--blue)}
.col img{margin-top:18px;height:120px;object-fit:cover;width:100%;border-radius:8px;filter:grayscale(.3)}
section{padding:56px 8vw}
section>p{margin:8px 0 24px;color:var(--mute);max-width:56ch}
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.cards article{background:#fff;border:1px solid var(--line);border-radius:10px;padding:18px;text-align:left}
.cards h3{font-size:15px;margin-bottom:8px}
.cards p{color:var(--mute);font-size:14px}
.cards b{display:block;margin-top:12px}
.cards small{color:var(--mute)}
.three{grid-template-columns:repeat(3,1fr)}
.cards.in{padding:20px;gap:12px;border:0;box-shadow:none}
.split{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:center}
.split img,.docs img{width:100%;height:280px;object-fit:cover;border-radius:12px;border:1px solid var(--line);filter:grayscale(.25)}
.split ul{list-style:none;display:grid;grid-template-columns:1fr 1fr;gap:8px;margin:16px 0 20px}
.split li{background:#fff;border:1px solid var(--line);padding:8px 10px;border-radius:8px;font-size:14px}
details{border-bottom:1px solid var(--line);padding:12px 0}
summary{cursor:pointer;font-weight:600}
details p{margin-top:8px;max-width:70ch;color:var(--mute)}
.ghost{display:inline-block;margin-top:12px;color:var(--blue);font-size:13px}
.help{display:grid;grid-template-columns:200px 1fr;gap:28px}
.help aside{display:flex;flex-direction:column;gap:8px;position:sticky;top:72px;align-self:start}
.help aside a{color:var(--mute);font-size:14px}
.help aside a:hover{color:var(--ink)}
.docs article{margin-bottom:32px}
.docs img{max-width:460px;height:210px;margin:14px 0}
.policy{margin-top:12px;padding:14px;background:#fff;border:1px solid var(--line);border-radius:10px}
footer{padding:36px 8vw 20px}
.cols{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:18px}
.cols h4{font-size:13px;margin-bottom:8px}
.cols a,.cols p{display:block;margin:6px 0;color:var(--mute);font-size:13px}
.copy{margin-top:18px;font-size:12px;color:var(--mute)}
@media (max-width:980px){
  .menu{display:none}
  .bench,.cards,.three,.split,.help,.cols{grid-template-columns:1fr}
}

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