:root{--bg:#E6EBF3;--fg:#141A26;--muted:#58637A;--accent:#2546D9;--surface:#fff}
@media (prefers-color-scheme:dark){:root{--bg:#0F1420;--fg:#E7ECF5;--muted:#9AA5BB;--accent:#7C93FF;--surface:#1A2132}}
body{margin:0;background:var(--bg);color:var(--fg);font:16px/1.6 system-ui,-apple-system,"Segoe UI",sans-serif}
main{max-width:720px;margin:0 auto;padding:24px 16px 64px}
h1{font-size:1.8rem;margin:.4em 0}h2{font-size:1.1rem;margin:1.6em 0 .3em}
a{color:var(--accent)}
.todo{background:#FFD43B;color:#2B2200;padding:8px 12px;border-radius:8px;font-weight:700}
hr{border:0;border-top:1px solid var(--muted);opacity:.3;margin:2em 0}