:root{--bg:#f7f7fb;--fg:#1c1a33;--muted:#5e5971;--brand:#343052;--accent:#ef7f1a;--card:#fff;--line:#e4e2ee}
@media (prefers-color-scheme:dark){:root{--bg:#16142a;--fg:#ecebf5;--muted:#b9b4cf;--brand:#ecebf5;--card:#1f1c38;--line:#2e2a4f}}
*{box-sizing:border-box}
body{margin:0;font-family:"Segoe UI",Roboto,Arial,sans-serif;background:var(--bg);color:var(--fg);line-height:1.55}
a{color:var(--accent)}
.top{display:flex;align-items:center;justify-content:space-between;padding:16px 24px;border-bottom:1px solid var(--line)}
.brand{font-weight:700;font-size:20px;color:var(--brand);text-decoration:none}
.brand span{color:var(--accent)}
nav a{margin-left:18px;color:var(--muted);text-decoration:none;font-size:15px}
nav a.active{color:var(--fg);font-weight:600}
.hero{text-align:center;padding:64px 24px 40px}
.hero .icon{border-radius:28px;box-shadow:0 16px 40px rgba(0,0,0,.18)}
.hero h1{font-size:40px;margin:24px 0 8px}
.hero p{color:var(--muted);font-size:18px;max-width:560px;margin:0 auto}
.cta{margin-top:24px}
.btn{display:inline-block;background:var(--accent);color:#fff;text-decoration:none;padding:12px 24px;border-radius:999px;font-weight:600}
.features{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:16px;max-width:1000px;margin:0 auto;padding:16px 24px 64px}
.features div{background:var(--card);border:1px solid var(--line);border-radius:20px;padding:20px}
.features h3{margin:0 0 6px;font-size:17px}
.features p{margin:0;color:var(--muted);font-size:15px}
.doc{max-width:760px;margin:0 auto;padding:32px 24px 64px}
.doc h1{font-size:32px;margin-bottom:4px}
.doc h2{font-size:22px;margin-top:32px}
.doc h3{font-size:17px;margin:18px 0 4px}
.doc p,.doc li{font-size:16px}
.muted{color:var(--muted)}
footer{text-align:center;color:var(--muted);font-size:14px;padding:24px;border-top:1px solid var(--line)}