:root { color-scheme: light dark; font: 16px/1.5 system-ui, sans-serif; }
body { margin: 0; min-height: 100vh; display: grid; place-items: center; background: Canvas; color: CanvasText; }
main { max-width: 28em; padding: 2em; }
h1 { font-weight: 600; margin: 0 0 .5em; }