body { font-family: system-ui, sans-serif; margin: 0; color: #1a1a1a; }
header { background: #0b5; color: #fff; padding: 1rem; }
header a { color: #fff; text-decoration: none; font-weight: bold; }
main { max-width: 42rem; margin: 2rem auto; padding: 0 1rem; }
input, button { padding: .5rem; font-size: 1rem; }
code { display: block; background: #f2f2f2; padding: .5rem; word-break: break-all; }
.button { display: inline-block; background: #0b5; color: #fff; padding: .75rem 1rem; text-decoration: none; border-radius: 4px; }
footer { text-align: center; padding: 2rem; color: #666; }