.is-lightbox-enabled {
  cursor: zoom-in;
}

.item-lightbox {
  box-sizing: border-box;

  position: fixed;
  inset: 0;

  width: 100vw;
  max-width: none;

  /* 古いスマホブラウザー用 */
  height: 100vh;
  max-height: 100vh;

  /* 対応ブラウザーではこちらを使用 */
  height: 100dvh;
  max-height: 100dvh;

  margin: 0;
  padding: 56px 16px 24px;

  border: 0;
  background: transparent;

  overflow: auto;
  overscroll-behavior: contain;
}

/*
 * dialogは通常時display:noneなので、
 * 開いているときだけ中央配置する
 */
.item-lightbox[open] {
  display: flex;
  align-items: center;
  justify-content: center;
}

.item-lightbox::backdrop {
  background: rgba(0, 0, 0, 0.88);
}

.item-lightbox__image {
  display: block;

  width: auto;
  max-width: calc(100vw - 32px);

  height: auto;
  max-height: calc(100vh - 80px);
  max-height: calc(100dvh - 80px);

  margin: auto;

  object-fit: contain;
  border-radius: 4px;

  box-shadow:
    0 10px 40px rgba(0, 0, 0, 0.4);
}

.item-lightbox__close {
  position: fixed;
  top: max(12px, env(safe-area-inset-top));
  right: max(12px, env(safe-area-inset-right));
  z-index: 2;

  display: grid;
  place-items: center;

  width: 44px;
  height: 44px;
  padding: 0;

  border: 1px solid rgba(255, 255, 255, 0.7);
  border-radius: 50%;

  background: rgba(0, 0, 0, 0.72);
  color: #fff;

  font: inherit;
  font-size: 30px;
  line-height: 1;

  cursor: pointer;
}

.item-lightbox__close:hover,
.item-lightbox__close:focus-visible {
  background: #fff;
  color: #222;
  outline: 2px solid #fff;
  outline-offset: 2px;
}

@media screen and (max-width: 480px) {
  .item-lightbox {
    padding:
      max(56px, env(safe-area-inset-top))
      12px
      max(16px, env(safe-area-inset-bottom));
  }

  .item-lightbox__image {
    max-width: calc(100vw - 24px);
    max-height: calc(100vh - 76px);
    max-height: calc(100dvh - 76px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .item-lightbox,
  .item-lightbox__image {
    scroll-behavior: auto;
  }
}