:root { color-scheme: light dark; font-family: system-ui, sans-serif; line-height: 1.5; }
body { margin: 0; padding: 2rem 1rem; }
main { max-width: 32rem; margin: 0 auto; }
form { display: grid; gap: .5rem; }
input, button { font: inherit; padding: .5rem; }
.message { padding: .5rem; border-left: .25rem solid currentColor; }