:root { font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial; }
body { margin: 0; padding: 0; }
main { max-width: 720px; margin: 2rem auto; padding: 0 1rem; }
h1 { font-size: 1.5rem; margin-bottom: 1rem; }
ul { line-height: 1.7; }