:root { color-scheme: light dark; font: 16px/1.5 system-ui, sans-serif; }
* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; display: grid; place-items: center; background: Canvas; color: CanvasText; }
main { width: min(28rem, calc(100% - 2rem)); padding: 2rem; border: 1px solid color-mix(in srgb, CanvasText 20%, transparent); border-radius: 1rem; }
a { display: inline-block; margin-top: 1rem; padding: .75rem 1rem; border-radius: .6rem; background: #2563eb; color: white; text-decoration: none; font-weight: 650; }