:root { color-scheme: light; }
body { font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif; margin: 0; }
.container { max-width: 900px; margin: 0 auto; padding: 24px; }
.button { display: inline-block; padding: 10px 14px; border: 1px solid #ccc; border-radius: 10px; text-decoration: none; color: inherit; }