/**
 * Image comparison component.
 */

.c--image-comparison {
  --image-comparison_line: #FFFFFF;
  --image-comparison_knob: 2.5rem;

  margin-block: 0 1.5rem;
}

.image-comparison__stage {
  position: relative;
  overflow: hidden;
  border-radius: 1rem;
  -webkit-user-select: none;
  -moz-user-select: none;
  user-select: none;
}

.image-comparison__image {
  display: block;
  width: 100%;
  height: auto;
}

/* Laid over the before image, which alone sizes the stage. */
.image-comparison__image--after {
  position: absolute;
  inset: 0;
  height: 100%;
  -o-object-fit: cover;
  object-fit: cover;
  clip-path: inset(0 0 0 var(--image-comparison_pos, 50%));
}

/* Divider line with a round knob in the middle. */
.image-comparison__handle {
  position: absolute;
  inset-block: 0;
  left: var(--image-comparison_pos, 50%);
  width: 2px;
  margin-left: -1px;
  background: var(--image-comparison_line);
  box-shadow: 0 0 4px rgba(0, 0, 0, 0.35);
  pointer-events: none;
}

.image-comparison__handle::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: var(--image-comparison_knob);
  height: var(--image-comparison_knob);
  border: 2px solid var(--image-comparison_line);
  border-radius: 50%;
  background:
    url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" width="20" height="20" viewBox="0 0 20 20" fill="none"><path d="M7 5 2 10l5 5M13 5l5 5-5 5" stroke="%23FFFFFF" stroke-width="2" stroke-linecap="square"/></svg>') no-repeat center,
    rgba(0, 0, 0, 0.35);
  transform: translate(-50%, -50%);
}

/* Invisible native slider over the whole image: drag anywhere, or use the
   arrow keys once focused. */
.image-comparison__range {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  margin: 0;
  opacity: 0;
  cursor: ew-resize;
  -webkit-appearance: none;
  -moz-appearance: none;
  appearance: none;
}

.image-comparison__stage:has(.image-comparison__range:focus-visible) .image-comparison__handle::before {
  outline: 2px solid var(--c-blue, #0081CC);
  outline-offset: 2px;
}