.backdrop {
  display: none;
  position: fixed;
  top: 0;
  right: 0;
  width: 100vw;
  height: 100dvh;
  z-index: 9;
  pointer-events: none;
  visibility: hidden;
  opacity: 0;
  backdrop-filter: blur(2px);
  transition: opacity 0.3s ease, visibility 0.3s ease, display 0.3s ease;
  transition-behavior: allow-discrete;
}

.backdrop.active {
  display: block;
  pointer-events: auto;
  visibility: visible;
  opacity: 1;
}