.site-header,
.product-header {
  transition: transform 220ms cubic-bezier(.2, .8, .2, 1), box-shadow 160ms ease-out;
  will-change: transform;
}
.site-header.header-hidden,
.product-header.header-hidden {
  transform: translate3d(0, calc(-100% - 8px), 0);
  pointer-events: none;
}
.product-header {
  position: sticky;
  top: 0;
  z-index: 60;
}
@media (prefers-reduced-motion: reduce) {
  .site-header,
  .product-header {
    transition: none;
    will-change: auto;
  }
}