/* Safety net: if the app window itself is ever printed (Ctrl+P on the POS screen),
   print nothing rather than wasting a roll. Real receipts print from the hidden
   iframe in receipt.js, which carries its own self-contained styles. */
@media print {
  body > * { display: none !important; }
  body::after {
    content: 'Use the Print button on a bill to print a receipt.';
    display: block; padding: 20px; font-family: sans-serif; font-size: 12px;
  }
}