body { font-family: system-ui, sans-serif; background: #f4f6f9; color: #1e293b; margin: 0; padding: 32px 16px; }
main { max-width: 760px; margin: auto; padding: 28px; background: white; border-radius: 12px; }
h1 { font-size: 24px; } p { line-height: 1.7; }
label { display: block; margin-bottom: 8px; }
select, button { font: inherit; padding: 12px; margin-bottom: 12px; border-radius: 6px; }
select { width: 100%; } button { background: #1769db; color: white; border: 0; cursor: pointer; }
button:disabled { opacity: .5; cursor: default; }
pre { white-space: pre-wrap; overflow-wrap: anywhere; background: #f1f5f9; padding: 16px; }