/* Section element */
.dhw-lightbox-gallery {
  --unit: 1rem;
  --spacing-sm: 0.25;
  --spacing-lg: 1;
  --max-img-width: 50; /* 800px */
  --max-img-height: 32; /* 512px */
  --accent-color: var(--wp--preset--color--custom-color-1);

  display: flex;
  flex-flow: column;
  gap: calc( var(--spacing-sm) * var(--unit) );
  padding-block: calc( var(--spacing-lg) * var(--unit) );
}

.dhw-lightbox-gallery * {
  box-sizing: border-box;
}

/* Container of large images: radio buttons and adjacent anchors around an image */
.dhw-lightbox-gallery__items {
  display: flex;
  gap: 0;
  flex-wrap: wrap;
  justify-content: center;
  max-width: calc( var(--max-img-width) * var(--unit) );
  margin-inline: auto;
  overflow-x: auto;
  position: relative;
}

/* Shared aspect ratio measurements */
.dhw-lightbox-gallery__img,
.dhw-lightbox-gallery__img img,
.dhw-lightbox-gallery__placeholder {
  aspect-ratio: var(--max-img-width) / var(--max-img-height);
}

/* Responsive size placeholder */
.dhw-lightbox-gallery__placeholder {
  flex: 0 0 100%;
  background: rgba(0,0,0,0.25);
  margin-block-end: calc( var(--spacing-lg) * var(--unit) );
}

/* Anchor container */
.dhw-lightbox-gallery__img {
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX( -50% );
  width: 100%;

  img {
    display: block;
    height: auto;
    object-fit: contain;
    width: 100%;
  }
}

/* Input type="radio" */
.dhw-lightbox-gallery__selector {
  appearance: none;
  background-color: transparent;
  border: 0px;
  border-radius: 50%;
  margin: 0;
  padding: calc( var(--spacing-lg) * var(--unit) );
  position: relative;
}

.dhw-lightbox-gallery__selector::after {
  content: "";
  display: block;
  width: calc( var(--spacing-lg) * var(--unit) );
  height: calc( var(--spacing-lg) * var(--unit) );
  margin: calc( var(--spacing-sm) * var(--unit) );
  background-color: var(--wp--preset--color--custom-color-8);
  border-radius: 50%;
  cursor: pointer;
}

.dhw-lightbox-gallery__selector:checked {
  outline: 2px solid var(--accent-color);
  outline-offset: -4px;
}

.dhw-lightbox-gallery__selector + .dhw-lightbox-gallery__img {
  opacity: 0;
  transition: opacity 500ms ease-in-out 0ms, visibility 0ms linear 500ms;
  visibility: hidden;
}

.dhw-lightbox-gallery__selector:checked::after {
  outline-offset: 2px;
  background-color: var(--accent-color);
  outline: 2px solid rgba(255, 255, 255, 0.1);
}

.dhw-lightbox-gallery__selector:checked + .dhw-lightbox-gallery__img {
  opacity: 1;
  transition: opacity 500ms ease-in-out 0ms, visibility 0ms linear 0ms;
  visibility: visible;
}

/* Nav element for thumbnails */
.dhw-lightbox-gallery__nav {
  display: flex;
  justify-content: start;
  gap: calc( var(--spacing-sm) * var(--unit) );
  flex-wrap: nowrap;
  margin-inline: calc( var(--wp--preset--spacing--30) * -1);
  margin-block-start: calc( var(--spacing-lg) * var(--unit) );
  overflow-x: auto;
  scroll-snap-type: x mandatory;
}

.dhw-lightbox-gallery__nav::-webkit-scrollbar {
  height: calc( var(--spacing-sm) * var(--unit) );
}

.dhw-lightbox-gallery__nav::-webkit-scrollbar-track {
  background-color: rgba(255, 255, 255, 0.1);
  border-radius: calc( (var(--spacing-sm)/2) * var(--unit) );
}

.dhw-lightbox-gallery__nav::-webkit-scrollbar-thumb {
  background-color: var(--accent-color);
  border-radius: calc( (var(--spacing-sm)/2) * var(--unit) );
}

/* Labels */
.dhw-lightbox-gallery__thumb {
  border: 5px solid transparent;
  border-radius: calc( var(--spacing-sm) * var(--unit) );
  cursor: pointer;
  display: block;
  flex: 0 0 auto;
  overflow: hidden;
  scroll-snap-align: start;
  width: calc( 18% - ( var(--spacing-lg) * var(--unit) ) );

  img {
    aspect-ratio: 1 / 1;
    border-radius: calc( var(--spacing-sm) * var(--unit) );
    display: block;
    object-fit: cover;
    opacity: 1;
    transition: border-color 250ms ease-in-out, opacity 250ms ease-in-out;
    width: 100%;
  }

  &:hover img,
  &:focus img {
    opacity: 0.25;
  }
}

@media (min-width: 48em) {
  .dhw-lightbox-gallery__thumb {
    width: calc( 12% - ( var(--spacing-sm) * var(--unit) ) );
  }
}

.dhw-lightbox-gallery__thumb.checked {
  outline: 2px solid var(--accent-color);
  outline-offset: -2px;

  img {
    opacity: 0.25;
  }
}