body { font-family: system-ui, sans-serif; margin: 0; background: #f6f7f9; color: #1c1e21; }
main { max-width: 40rem; margin: 4rem auto; padding: 2rem; background: #fff; border-radius: 12px; box-shadow: 0 1px 4px rgba(0,0,0,.08); }
h1 { font-size: 1.5rem; margin-top: 0; }