/* Estilos mínimos para el generador QR avanzado */
.qr-preview-box {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 280px;
  border: 1px dashed var(--bs-border-color, #ced4da);
  border-radius: .5rem;
  background: #fff;
  padding: 12px;
}
.history-item img { object-fit: cover; border-radius: .25rem; }

.sticky-preview { position: sticky; top: 1rem; }
.advanced-hidden .advanced-only { display: none !important; }