:root{--bg:#fff;--fg:#14202e;--muted:#55636f;--accent:#1f5f8b;--line:#e3e8ec}
@media (prefers-color-scheme:dark){:root{--bg:#0f1720;--fg:#e8edf1;--muted:#9aa7b2;--accent:#7cb8e0;--line:#24313d}}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--fg);font:16px/1.6 system-ui,-apple-system,Segoe UI,sans-serif}
.wrap{max-width:760px;margin:0 auto;padding:32px 16px}
header{border-bottom:1px solid var(--line)}header .wrap{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:8px;padding-top:18px;padding-bottom:18px}
header a.brand{font-weight:700;color:var(--fg);text-decoration:none}nav a{margin-left:16px;color:var(--muted);text-decoration:none}
a{color:var(--accent)}h1{font-size:2rem;line-height:1.2}h2{margin-top:2rem}.muted{color:var(--muted)}
footer{border-top:1px solid var(--line);margin-top:48px}footer .wrap{font-size:.9rem;color:var(--muted)}