body { margin: 0; padding: 24px; background: #f7f8fa; color: #17233b; font: 18px/1.5 system-ui, sans-serif; }
main { max-width: 480px; margin: 12vh auto; }
h1 { font-size: 26px; line-height: 1.3; }
button { padding: 12px 24px; border: 0; border-radius: 8px; background: #233b76; color: white; font: inherit; cursor: pointer; }
button:hover { background: #152753; }
button:focus-visible { outline: 3px solid #456cf3; outline-offset: 4px; }