:root { color-scheme: light dark; font-family: Arial, sans-serif; }
body { margin: 0; background: #f7f8fa; color: #20242a; }
main { max-width: 760px; margin: 0 auto; padding: 64px 24px; }
h1 { font-size: 34px; margin: 0 0 18px; }
h2 { font-size: 22px; margin: 36px 0 10px; }
p { font-size: 17px; line-height: 1.55; margin: 0 0 14px; }
@media (prefers-color-scheme: dark) { body { background: #17191d; color: #eceff3; } }