:root { color-scheme: light dark; }
body { font: 16px/1.5 system-ui, sans-serif; max-width: 36rem; margin: 2rem auto; padding: 0 16px; }
h1 { font-size: 1.4rem; }
form { display: grid; gap: 0.5rem; margin-top: 1.5rem; }
input { font: inherit; padding: 0.6rem; min-height: 44px; }
button { font: inherit; padding: 0.6rem; min-height: 44px; }
#result { margin-top: 1rem; min-height: 1.5rem; }