:root{--ink:#1d1d2b;--muted:#5d5d73;--accent:#3b6df0;--bg:#f6f7fb;--card:#fff}
@media(prefers-color-scheme:dark){:root{--ink:#eceef7;--muted:#a3a7bd;--bg:#12131a;--card:#1b1d27}}
*{box-sizing:border-box}body{margin:0;font:16px/1.6 -apple-system,BlinkMacSystemFont,"SF Pro Text",Segoe UI,sans-serif;color:var(--ink);background:var(--bg)}
.wrap{max-width:900px;margin:0 auto;padding:0 20px}header{padding:56px 0 24px;text-align:center}h1{font-size:44px;margin:12px 0 8px;letter-spacing:-.02em}
.sub{color:var(--muted);font-size:20px;max-width:640px;margin:0 auto 24px}.btn{display:inline-block;background:var(--accent);color:#fff;padding:12px 26px;border-radius:12px;text-decoration:none;font-weight:600}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:16px;margin:36px 0}.card{background:var(--card);border-radius:16px;padding:20px;box-shadow:0 1px 3px rgba(0,0,0,.08)}
.card h3{margin:0 0 6px}.card p{margin:0;color:var(--muted)}footer{padding:40px 0;color:var(--muted);text-align:center;font-size:14px}a{color:var(--accent)}
main.doc{background:var(--card);border-radius:16px;padding:28px 32px;margin:30px 0}main.doc h1{font-size:32px}.note{color:var(--muted);font-size:14px}