:root { color-scheme: light dark; --fg: #1d2330; --bg: #f6f7f9; --muted: #6b7280; }
@media (prefers-color-scheme: dark) { :root { --fg: #e8eaee; --bg: #12151b; --muted: #9aa3b2; } }
* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; display: grid; place-items: center; background: var(--bg); color: var(--fg);
       font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; }
main { max-width: 32rem; padding: 2rem; text-align: center; }
h1 { margin: 0 0 .5rem; font-size: 2rem; }
.muted { color: var(--muted); }