html { background: #ffffff; color: #000000; font-family: -apple-system, system-ui, sans-serif; }
body { margin: 0; }
main { max-width: 40rem; margin: 0 auto; padding: 2rem 1rem; font-size: 1.25rem; line-height: 1.5; }
h1 { font-size: 2rem; }
.button { display: inline-block; min-height: 44px; padding: 0.75rem 1.25rem; border-radius: 12px; background: #000000; color: #ffffff;
  text-decoration: none; font-weight: 600; }
.button:focus { outline: 3px solid #01cdff; outline-offset: 3px; }
.small { font-size: 1rem; }