/* Reserva espacio + oculta hasta que JS marque listo */
.thegem-te-product-add-to-cart form.variations_form.cart,
form.variations_form.cart{
  display:block !important;
  visibility:hidden !important;
  min-height:320px; /* mobile */
}

/* Cuando JS corre, mostramos */
.thegem-te-product-add-to-cart form.variations_form.cart.nm-variations-ready,
form.variations_form.cart.nm-variations-ready{
  visibility:visible !important;
  min-height:auto !important;
}