:root{--bg:#ffffff;--fg:#0f1419;--muted:#536471;--line:#e6ecf0;--card:#f7f9fa;--accent:#1d9bf0;--accent-fg:#fff;--yellow:#ffd34d}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){--bg:#000;--fg:#e7e9ea;--muted:#8b98a5;--line:#2f3336;--card:#16181c;--accent:#1d9bf0}}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--fg);font:16px/1.6 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif}
a{color:var(--accent)}
.wrap{max-width:880px;margin:0 auto;padding:0 20px}
header.top{display:flex;align-items:center;gap:10px;padding:20px 0}
header.top a.brand{display:flex;align-items:center;gap:10px;color:var(--fg);text-decoration:none;font-weight:700;font-size:18px}
header.top img{width:32px;height:32px}
header.top nav{margin-left:auto;font-size:15px}
header.top nav a{color:var(--muted);text-decoration:none;margin-left:18px}
header.top nav a:hover{color:var(--fg)}
.hero{text-align:center;padding:56px 0 40px}
.hero img{width:120px;height:120px}
.hero h1{font-size:clamp(32px,6vw,48px);line-height:1.15;margin:20px 0 12px;letter-spacing:-.02em}
.hero p{font-size:19px;color:var(--muted);max-width:560px;margin:0 auto 28px}
.btn{display:inline-block;background:var(--accent);color:var(--accent-fg);text-decoration:none;font-weight:700;padding:12px 24px;border-radius:999px}
.btn.disabled{opacity:.55;cursor:default}
.note{display:block;margin-top:10px;font-size:14px;color:var(--muted)}
.features{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:16px;padding:24px 0 48px}
.feature{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:22px}
.feature .ico{width:40px;height:40px;border-radius:10px;background:var(--accent);display:grid;place-items:center;margin-bottom:12px}
.feature .ico svg{width:22px;height:22px;stroke:#fff;fill:none;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
.feature h3{margin:0 0 6px;font-size:18px}
.feature p{margin:0;color:var(--muted);font-size:15px}
section h2{font-size:24px;margin:0 0 12px}
section.block{border-top:1px solid var(--line);padding:40px 0}
section.block ul{padding-left:20px;margin:0}
section.block li{margin:6px 0}
footer{border-top:1px solid var(--line);padding:24px 0 40px;color:var(--muted);font-size:14px;display:flex;flex-wrap:wrap;gap:8px 20px}
footer a{color:var(--muted)}
article.doc{padding:24px 0 48px}
article.doc h1{font-size:34px;margin:16px 0 4px;letter-spacing:-.01em}
article.doc .updated{color:var(--muted);margin:0 0 28px}
article.doc h2{font-size:20px;margin:32px 0 8px}