:root { font-family: system-ui, Arial, sans-serif; }
body { margin: 0; background: #0f172a; color: #e2e8f0; }
main { max-width: 720px; margin: 6rem auto; padding: 0 1rem; }
h1 { font-size: 2.2rem; margin-bottom: .5rem; }
p { opacity: .9; }