body { margin: 0; color: #253144; background: #f7f9fc; font: 18px/1.6 system-ui, sans-serif; }
main { max-width: 48rem; margin: 15vh auto; padding: 2rem; }
h1 { font-size: clamp(2rem, 6vw, 3.5rem); margin-bottom: .5rem; }