:root{
  --bg:#111113;
  --fg:#e8e8ea;
  --mute:#8b8b93;
  --line:#232326;
  --card:#18181b;
  --accent:#5e6ad2;
  --light:#f4f4f5;
  --ink:#18181b;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:"Inter","Segoe UI","PingFang SC",sans-serif;
  background:var(--bg);
  color:var(--fg);
  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:12px 7vw;
  background:rgba(17,17,19,.9);
  border-bottom:1px solid var(--line);
}
.logo{font-weight:600;letter-spacing:-.03em;font-size:14px}
.menu{display:flex;gap:20px;font-size:13px;color:var(--mute)}
.menu a:hover{color:var(--fg)}
.btn{
  display:inline-flex;align-items:center;justify-content:center;
  min-height:32px;padding:0 12px;border-radius:5px;
  background:var(--accent);color:#fff;font-size:13px;font-weight:600;
}
.btn:hover{filter:brightness(1.08)}
.hero{padding:64px 7vw 48px}
.hero.compact{padding:56px 7vw 28px}
.kicker{
  font-size:clamp(28px,4.5vw,48px);
  font-weight:560;letter-spacing:-.04em;margin-bottom:16px;
}
h1{font-size:clamp(20px,2.6vw,28px);font-weight:600;max-width:18ch}
.sub{margin-top:10px;color:var(--mute);max-width:42ch}
.line{margin:12px 0 24px}
.flow{
  list-style:none;display:flex;gap:0;margin:28px 0 32px;
  border:1px solid var(--line);border-radius:6px;overflow:hidden;
  max-width:720px;
}
.flow li{
  flex:1;padding:12px 14px;font-size:13px;
  border-right:1px solid var(--line);
}
.flow li:last-child{border-right:0}
.flow span{display:block;color:var(--accent);font-size:11px;margin-bottom:4px}
.modes{display:grid;grid-template-columns:1.1fr .9fr;gap:10px;align-items:stretch}
.modes figure{border:1px solid var(--line);border-radius:6px;overflow:hidden}
.dark-pane{background:#0c0c0e}
.light-pane{background:var(--light)}
.modes img{height:220px;object-fit:cover;width:100%}
.light-pane img{filter:grayscale(.1) brightness(1.08)}
section{padding:64px 7vw;border-top:1px solid var(--line)}
section>p{margin:8px 0 24px;color:var(--mute);max-width:56ch}
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
.cards article{
  background:var(--card);border:1px solid var(--line);
  border-radius:6px;padding:18px 16px 20px;
}
.cards h3{font-size:14px;margin-bottom:8px}
.cards p{color:var(--mute);font-size:13px}
.cards b{display:block;margin-top:12px;font-size:13px}
.cards small{color:var(--mute)}
.three{grid-template-columns:repeat(3,1fr)}
.split{display:grid;grid-template-columns:1fr 1fr;gap:36px;align-items:center}
.split img{height:300px;object-fit:cover;width:100%;border:1px solid var(--line);border-radius:6px}
.split ul{list-style:none;display:grid;grid-template-columns:1fr 1fr;gap:8px;margin:16px 0 22px}
.split li{border-bottom:1px solid var(--line);padding:8px 0;font-size:13px}
details{border-bottom:1px solid var(--line);padding:12px 0}
summary{cursor:pointer;font-weight:600;font-size:14px}
details p{margin-top:8px;max-width:70ch;color:var(--mute)}
section a[href="help.html"]{color:var(--accent)}
.ghost{display:inline-block;margin-top:12px;color:var(--accent);font-size:13px}
.help{display:grid;grid-template-columns:200px 1fr;gap:32px}
.help aside{display:flex;flex-direction:column;gap:8px;position:sticky;top:64px;align-self:start}
.help aside a{color:var(--mute);font-size:13px;padding:6px 8px;border-radius:5px}
.help aside a:hover{background:var(--card);color:var(--fg)}
.docs article{margin-bottom:36px}
.docs img{max-width:460px;height:210px;object-fit:cover;margin:14px 0;border:1px solid var(--line);border-radius:6px}
.policy{margin-top:12px;padding:14px;border:1px solid var(--line);border-radius:6px;background:var(--card)}
footer{padding:36px 7vw 20px;border-top:1px solid var(--line)}
.cols{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:18px}
.cols h4{font-size:12px;color:var(--mute);margin-bottom:8px}
.cols a,.cols p{display:block;margin:6px 0;color:var(--mute);font-size:13px}
.copy{margin-top:20px;font-size:12px;color:#555}
@media (max-width:980px){
  .menu{display:none}
  .flow{flex-direction:column}
  .flow li{border-right:0;border-bottom:1px solid var(--line)}
  .modes,.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}}