html { color-scheme: light dark; }
body { margin: 0; min-height: 100vh; display: grid; place-items: center;
       font-family: system-ui, sans-serif; padding: 0 16px; }
h1 { font-weight: 600; font-size: 1.6rem; text-align: center; }
ul { list-style: none; margin: 0; padding: 0; text-align: center; line-height: 2; }