:root { color-scheme: light dark; font-family: Arial, sans-serif; }
body { margin: 0; min-height: 100vh; display: grid; place-items: center; background: #f6f7f9; color: #17202a; }
main { width: min(680px, calc(100% - 48px)); }
h1 { font-size: 34px; margin: 0 0 14px; font-weight: 700; letter-spacing: 0; }
p { font-size: 17px; line-height: 1.55; margin: 0 0 8px; }
.muted { color: #657282; }
@media (prefers-color-scheme: dark) { body { background: #11161d; color: #edf2f7; } .muted { color: #9ca9b8; } }