/* Image diff compare modes for .img-comparison cards.
 * Mirrors GitHub Desktop's image diff viewer: 2-up, Swipe, Onion Skin and
 * Difference modes, with YouTube-style controls shown on hover, plus an
 * enlarged popup viewer that uses the high resolution .png screenshots. */

.img-comparison.idc {
  user-select: none;
  -webkit-user-select: none;
  touch-action: pan-y;
}

.idc .idc-base {
  position: relative;
  z-index: 5;
}

/* The "after" image, stacked on top of the base image. */
.idc .idc-top {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: fill;
  display: block;
  pointer-events: none;
  z-index: 10;
}

/* ---- presentation modes ---- */

/* 2-up keeps the original hover behavior: swap on hover, swap back on leave. */
.idc[data-mode='2up'] .idc-top {
  visibility: hidden;
}
.idc[data-mode='2up']:hover .idc-top {
  visibility: visible;
}

.idc[data-mode='swipe'] {
  cursor: ew-resize;
  /* pan-y keeps vertical page scrolling native on touch devices */
  touch-action: pan-y;
}
.idc[data-mode='swipe'] .idc-top {
  clip-path: inset(0 0 0 var(--id-split, 0%));
}

.idc[data-mode='onion'] .idc-top {
  opacity: var(--id-opacity, 1);
}

.idc[data-mode='diff'] .idc-top {
  mix-blend-mode: difference;
}

/* ---- swipe divider ---- */
.idc-divider {
  position: absolute;
  top: 0;
  bottom: 0;
  left: var(--id-split, 0%);
  width: 0;
  z-index: 20;
  display: none;
  pointer-events: none;
}
.idc[data-mode='swipe'] .idc-divider {
  display: block;
}
.idc-divider::before {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  left: -1px;
  width: 2px;
  background: rgba(255, 255, 255, 0.9);
  box-shadow: 0 0 4px rgba(0, 0, 0, 0.7);
}

/* ---- controls overlay (YouTube-style, shown on hover) ---- */
.idc-controls {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 30;
  display: flex;
  align-items: center;
  gap: 3px;
  flex-wrap: wrap;
  padding: 20px 6px 4px;
  background: linear-gradient(
    to top,
    rgba(0, 0, 0, 0.75) 0%,
    rgba(0, 0, 0, 0.45) 55%,
    rgba(0, 0, 0, 0) 100%
  );
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.12s ease-in-out, visibility 0s linear 0.12s;
}
.idc:hover .idc-controls,
.idc-controls:focus-within {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transition: opacity 0.12s ease-in-out;
}

.idc-btn {
  appearance: none;
  -webkit-appearance: none;
  background: rgba(20, 20, 20, 0.78);
  color: #f2f2f2;
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: 3px;
  font-size: 11px;
  font-family: inherit;
  line-height: 1;
  padding: 4px 7px;
  margin: 0;
  cursor: pointer;
  white-space: nowrap;
}
.idc-btn:hover {
  background: rgba(75, 75, 75, 0.92);
  color: #fff;
}
.idc-btn:focus {
  outline: none;
}
.idc-btn.idc-active {
  background: #ffffff;
  color: #111;
  border-color: #ffffff;
}

.idc-btn.idc-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 4px 6px;
}
.idc-btn.idc-icon svg {
  width: 13px;
  height: 13px;
  fill: currentColor;
  display: block;
}

.idc-range {
  width: 74px;
  margin: 0 4px 0 2px;
  height: 14px;
  display: none;
  cursor: pointer;
  accent-color: #ffffff;
  touch-action: pan-y;
}
.idc[data-mode='swipe'] .idc-range.idc-range-swipe,
.idc[data-mode='onion'] .idc-range.idc-range-onion {
  display: inline-block;
}

/* ---- enlarged popup viewer ---- */
#imgdiff-modal .modal-dialog {
  max-width: 94vw;
}
#imgdiff-modal .modal-content {
  background: #141414;
  border: 0;
  border-radius: 4px;
}
#imgdiff-modal .modal-body {
  padding: 0;
}
#imgdiff-modal-stage {
  text-align: center;
}

.idc-modal {
  position: relative;
  display: inline-block;
  line-height: 0;
  max-width: 100%;
  user-select: none;
  -webkit-user-select: none;
}
.idc-modal .idc-base {
  display: block;
  max-width: 94vw;
  max-height: 86vh;
  width: auto;
  height: auto;
}
.idc-modal .idc-top {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: fill;
}

/* Touch devices don't have hover: keep the controls visible. */
@media (hover: none) {
  .idc-controls {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    background: linear-gradient(
      to top,
      rgba(0, 0, 0, 0.55) 0%,
      rgba(0, 0, 0, 0) 100%
    );
  }
}

/* Small screens: keep every control on a single line and make the range
   bar narrower so it doesn't push the buttons to wrap. */
@media (max-width: 575px) {
  .idc-controls {
    flex-wrap: nowrap;
    gap: 2px;
    padding: 16px 4px 3px;
  }

  .idc-btn {
    font-size: 10px;
    padding: 3px 5px;
  }

  .idc-btn.idc-icon {
    padding: 3px 4px;
  }

  .idc-range {
    width: 40px;
    min-width: 26px;
    max-width: 56px;
    flex: 1 1 40px;
    height: 12px;
    margin: 0 3px 0 1px;
  }
}