/**
 * VR Slider - Responsive Slider CSS
 * Build by Marc Dumont
 * 
 * Grid-based layout with external arrow positioning and centered pagination.
 */

/* Container - Grid layout with arrows on sides */
.vr-slider {
  display: grid;
  grid-template-columns: auto 1fr auto;
  grid-template-rows: 1fr auto;
  align-items: center;
  gap: 20px;
  width: 100%;
  visibility: hidden;

  /* Theming CSS variables */
  --vr-gap: 20px;
  --vr-transition-duration: 400ms;
  --vr-transition-easing: cubic-bezier(0.25, 0.1, 0.25, 1);

  /* Arrows */
  --vr-arrow-size: 44px;
  --vr-arrow-icon-size: 24px;
  --vr-arrow-color: #1a1a1a;
  --vr-arrow-bg: rgba(255, 255, 255, 0.9);
  --vr-arrow-bg-hover: #ffffff;
  --vr-arrow-border-radius: 50%;
  --vr-arrow-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);

  /* Dots */
  --vr-dot-size: 10px;
  --vr-dot-gap: 8px;
  --vr-dot-color: rgba(0, 0, 0, 0.2);
  --vr-dot-active-color: #1a1a1a;
  --vr-dot-border-radius: 50%;
  --vr-pagination-offset: 20px;
}

/* Show slider once JS has initialized */
.vr-slider.vr-slider--initialized {
  visibility: visible;
}

/* Viewport - clips overflow, positioned in grid column 2 */
.vr-slider__viewport {
  grid-column: 2;
  grid-row: 1;
  overflow: hidden;
  width: 100%;
}

/* Track - flex container for slides */
.vr-slider__track {
  display: flex;
  gap: var(--vr-gap);
  transition: transform var(--vr-transition-duration) var(--vr-transition-easing);
  touch-action: pan-y pinch-zoom;
  justify-content: flex-start;
}

/* Slide - flex item with fixed width */
.vr-slider__slide {
  flex: 0 0 auto;
  width: var(--vr-slide-width);
  min-width: 0;
  contain: layout style;
}

/* Arrow base styles - positioned via grid */
.vr-slider__arrow {
  grid-row: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  width: var(--vr-arrow-size);
  height: var(--vr-arrow-size);
  padding: 0;
  border: none;
  border-radius: var(--vr-arrow-border-radius);
  background: var(--vr-arrow-bg);
  color: var(--vr-arrow-color);
  box-shadow: var(--vr-arrow-shadow);
  cursor: pointer;
  transition: background-color 200ms ease, opacity 200ms ease;
  -webkit-appearance: none;
  appearance: none;
  user-select: none;
  flex-shrink: 0;
}

.vr-slider__arrow:hover {
  background: var(--vr-arrow-bg-hover);
}

.vr-slider__arrow:focus-visible {
  outline: 2px solid var(--vr-arrow-color);
  outline-offset: 2px;
}

.vr-slider__arrow:disabled {
  opacity: 0.3;
  cursor: not-allowed;
}

/* Previous arrow - left column */
.vr-slider__arrow--prev {
  grid-column: 1;
}

/* Next arrow - right column */
.vr-slider__arrow--next {
  grid-column: 3;
}

/* Arrow SVG icon */
.vr-slider__arrow svg {
  width: var(--vr-arrow-icon-size);
  height: var(--vr-arrow-icon-size);
  flex-shrink: 0;
}

/* Pagination - spans full width below slides */
.vr-slider__pagination {
  grid-column: 1 / -1;
  grid-row: 2;
  display: flex;
  justify-content: center;
  gap: var(--vr-dot-gap);
  margin-top: var(--vr-pagination-offset);
}

/* Pagination dots */
.vr-slider__dot {
  width: var(--vr-dot-size);
  height: var(--vr-dot-size);
  padding: 0;
  border: none;
  border-radius: var(--vr-dot-border-radius);
  background: var(--vr-dot-color);
  cursor: pointer;
  transition: background-color 200ms ease, transform 200ms ease;
  -webkit-appearance: none;
  appearance: none;
  user-select: none;
  flex-shrink: 0;
}

.vr-slider__dot:hover {
  transform: scale(1.2);
}

.vr-slider__dot:focus-visible {
  outline: 2px solid var(--vr-dot-active-color);
  outline-offset: 2px;
}

/* Active dot */
.vr-slider__dot--active {
  background: var(--vr-dot-active-color);
}

/* Hide nav when not needed */
.vr-slider--nav-hidden .vr-slider__arrow,
.vr-slider--nav-hidden .vr-slider__pagination {
  display: none;
}

/* When nav is hidden, viewport spans full width */
.vr-slider--nav-hidden {
  grid-template-columns: 1fr;
}

.vr-slider--nav-hidden .vr-slider__viewport {
  grid-column: 1;
}

/* Dragging state */
.vr-slider--dragging .vr-slider__track {
  transition: none;
  cursor: grabbing;
  will-change: transform;
}

/* Hide arrows on mobile when configured */
@media (max-width: 767px) {
  .vr-slider--hide-arrows-mobile {
    grid-template-columns: 1fr;
    gap: 0;
  }

  .vr-slider--hide-arrows-mobile .vr-slider__arrow {
    display: none;
  }

  .vr-slider--hide-arrows-mobile .vr-slider__viewport {
    grid-column: 1;
  }

  .vr-slider--hide-arrows-mobile .vr-slider__pagination {
    grid-column: 1;
  }
}

/* Accessibility: respect prefers-reduced-motion */
@media (prefers-reduced-motion: reduce) {
  .vr-slider__track {
    transition-duration: 0ms;
  }
}