/* The static popup remains usable when JavaScript is unavailable. */
details.promotion-popup:not([open]) {
  display: none;
}
details.promotion-popup > summary {
  list-style: none;
}
details.promotion-popup > summary::-webkit-details-marker {
  display: none;
}
.promotion-backdrop {
  display: none;
}
body:has(details.promotion-popup[open]:not([hidden])) .promotion-backdrop {
  display: block;
}