/* ==========================================================================
   Image Compare — Before/After Slider Component
   Reusable across guide pages. Zero dependencies.
   ========================================================================== */

.image-compare {
  --ic-aspect: 16 / 9;
  --ic-max-width: 900px;
  --ic-handle-size: 44px;
  --ic-label-size: 12px;
  --ic-radius: 12px;
  --ic-shadow: 0 10px 30px rgba(0, 0, 0, 0.12);
  --ic-bg: #0a0a0a;
  --ic-border: 1px solid var(--color-gray-200);
  --ic-divider-color: rgba(255, 255, 255, 0.9);
  --ic-handle-bg: rgba(10, 10, 10, 0.85);
  --ic-focus-ring: 0 0 0 4px rgba(0, 196, 255, 0.25);

  position: relative;
  width: 100%;
  max-width: var(--ic-max-width);
  margin-inline: auto;
  aspect-ratio: var(--ic-aspect);
  border-radius: var(--ic-radius);
  border: var(--ic-border);
  overflow: hidden;
  box-shadow: var(--ic-shadow);
  background: var(--ic-bg);
  touch-action: none;
  user-select: none;
  cursor: ew-resize;
}

.image-compare__base,
.image-compare__top {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  pointer-events: none;
}

.image-compare__overlay {
  position: absolute;
  inset: 0;
  clip-path: inset(0 50% 0 0);
  transition: clip-path 0.15s ease;
  will-change: clip-path;
}

.image-compare[data-dragging="true"] .image-compare__overlay {
  transition: none;
}

.image-compare__divider {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  width: 2px;
  margin-left: -1px;
  background: var(--ic-divider-color);
  box-shadow: 0 0 8px rgba(0, 0, 0, 0.6);
  pointer-events: none;
  z-index: 2;
}

.image-compare__handle {
  position: absolute;
  top: 50%;
  left: 50%;
  width: var(--ic-handle-size);
  height: var(--ic-handle-size);
  margin-top: calc(var(--ic-handle-size) / -2);
  margin-left: calc(var(--ic-handle-size) / -2);
  padding: 0;
  border: 2px solid #fff;
  border-radius: 50%;
  background: var(--ic-handle-bg);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  color: #fff;
  cursor: ew-resize;
  z-index: 3;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 2px;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.image-compare__handle:hover,
.image-compare__handle:focus-visible {
  transform: scale(1.08);
}

.image-compare__handle:focus-visible {
  outline: none;
  box-shadow: var(--ic-focus-ring);
}

.image-compare__handle-icon {
  width: 14px;
  height: 14px;
  flex-shrink: 0;
}

.image-compare__label {
  position: absolute;
  top: 16px;
  padding: 6px 12px;
  border-radius: 999px;
  background: rgba(10, 10, 10, 0.75);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  color: #fff;
  font-size: var(--ic-label-size);
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  pointer-events: none;
  z-index: 2;
}

.image-compare__label--before {
  left: 16px;
}

.image-compare__label--after {
  right: 16px;
}

.image-compare-wrap {
  margin: var(--space-8) auto;
}

.image-compare-caption {
  max-width: var(--ic-max-width);
  margin: var(--space-3) auto 0;
  font-size: var(--text-sm);
  color: var(--color-gray-500);
  text-align: center;
  line-height: 1.5;
}

@media (max-width: 640px) {
  .image-compare {
    --ic-handle-size: 38px;
    --ic-label-size: 10px;
  }

  .image-compare__label {
    top: 12px;
    padding: 4px 10px;
  }

  .image-compare__label--before {
    left: 12px;
  }

  .image-compare__label--after {
    right: 12px;
  }
}

body.night-vision .image-compare {
  border-color: var(--nv-border);
}

@media (prefers-reduced-motion: reduce) {
  .image-compare__handle {
    transition: none;
  }
}