:root {
  --slideshow-overlay-bg: rgba(0, 0, 0, 0.95);
  --slideshow-controls-bg: rgba(0, 0, 0, 0.5);
  --slideshow-controls-color: #fff;
  --slideshow-controls-size: 2rem;
  --slideshow-caption-bg: rgba(0, 0, 0, 0.7);
  --slideshow-caption-color: #fff;
  --slideshow-font-family: inherit;
  --slideshow-thumb-size: 60px;
  --slideshow-thumb-active-border: 2px solid #fff;
  --slideshow-transition-duration: 0.3s;
}

/* Overlay */
.slideshow-overlay {
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: var(--slideshow-overlay-bg);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  font-family: var(--slideshow-font-family);
}

.slideshow-overlay[hidden] {
  display: none;
}

/* Image container */
.slideshow-image-container {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  width: 100%;
  min-height: 0;
}

.slideshow-image {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
}

/* Controls */
.slideshow-controls {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1rem;
  background: var(--slideshow-controls-bg);
  z-index: 20;
  opacity: 0;
  transition: opacity var(--slideshow-transition-duration);
}

.controls-visible .slideshow-controls {
  opacity: 1;
}

.slideshow-controls button {
  background: none;
  border: none;
  color: var(--slideshow-controls-color);
  font-size: var(--slideshow-controls-size);
  cursor: pointer;
  padding: 0.25rem 0.5rem;
  line-height: 1;
}

.slideshow-controls button:hover {
  opacity: 0.8;
}

.slideshow-close {
  margin-right: auto;
}

.slideshow-counter {
  color: var(--slideshow-controls-color);
  font-size: 0.875rem;
  margin-left: 0.5rem;
  opacity: 0;
  transition: opacity var(--slideshow-transition-duration);
}

.controls-visible .slideshow-counter {
  opacity: 1;
}

/* Navigation arrows (prev/next positioned at sides) */
.slideshow-prev,
.slideshow-next {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  z-index: 10;
  font-size: 3rem;
  opacity: 0;
  transition: opacity var(--slideshow-transition-duration);
}

.controls-visible .slideshow-prev,
.controls-visible .slideshow-next {
  opacity: 1;
}

.slideshow-prev {
  left: 1rem;
}

.slideshow-next {
  right: 1rem;
}

/* Caption */
.slideshow-caption {
  position: absolute;
  bottom: calc(var(--slideshow-thumb-size) + 1.5rem);
  left: 0;
  right: 0;
  padding: 0.75rem 1rem;
  background: var(--slideshow-caption-bg);
  color: var(--slideshow-caption-color);
  text-align: center;
  z-index: 10;
  opacity: 0;
  transition: opacity var(--slideshow-transition-duration);
}

.controls-visible .slideshow-caption {
  opacity: 1;
}

.slideshow-caption.hidden {
  display: none;
}

.slideshow-caption-title {
  margin: 0 0 0.25rem;
  font-size: 1.1rem;
}

.slideshow-caption-date {
  font-size: 0.8rem;
  opacity: 0.7;
}

.slideshow-caption-description {
  margin: 0.25rem 0 0;
  font-size: 0.9rem;
}

/* Thumbnail strip */
.slideshow-thumbnails {
  display: flex;
  gap: 0.25rem;
  padding: 0.5rem;
  overflow-x: auto;
  width: 100%;
  flex-shrink: 0;
  background: rgba(0, 0, 0, 0.5);
}

.slideshow-thumb {
  flex-shrink: 0;
  width: var(--slideshow-thumb-size);
  height: var(--slideshow-thumb-size);
  cursor: pointer;
  border: 2px solid transparent;
  overflow: hidden;
}

.slideshow-thumb.active {
  border: var(--slideshow-thumb-active-border);
}

.slideshow-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}