:root{--bg:#f6f7fb;--fg:#1a1f2e;--muted:#5a6478;--accent:#2C5FDD;--card:#fff;--border:#e2e6ef}
@media(prefers-color-scheme:dark){:root{--bg:#0f1320;--fg:#e8ebf4;--muted:#98a2b8;--accent:#6f92f0;--card:#171c2b;--border:#28304a}}
*{box-sizing:border-box}html{-webkit-text-size-adjust:100%}
body{margin:0;font:16px/1.65 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;background:var(--bg);color:var(--fg)}
.wrap{max-width:720px;margin:0 auto;padding:32px 20px 64px}
header{display:flex;align-items:center;gap:12px;margin-bottom:8px}
.logo{width:40px;height:40px;border-radius:10px;background:var(--accent);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:20px}
h1{font-size:1.7rem;margin:.2em 0}h2{font-size:1.15rem;margin:1.8em 0 .4em}
a{color:var(--accent)}.muted{color:var(--muted)}
nav{display:flex;flex-wrap:wrap;gap:14px;margin:18px 0 28px;font-size:.95rem}
.card{background:var(--card);border:1px solid var(--border);border-radius:14px;padding:22px 24px;margin:16px 0}
footer{margin-top:40px;font-size:.85rem;color:var(--muted);border-top:1px solid var(--border);padding-top:16px}
code{background:var(--border);padding:1px 6px;border-radius:5px;font-size:.9em}