:root { color-scheme: light dark; font-family: system-ui, sans-serif; }
body { margin: 0; padding: 3rem 1.5rem; }
main { max-width: 32rem; margin: auto; line-height: 1.6; }
a { color: light-dark(#1557b0, #90bcff); }
button { font: inherit; padding: .5rem 1rem; cursor: pointer; }