/* ==========================================================================
   Mairo Toom Photography - Fullscreen Lightbox Viewer
   Minimal UI, pure black backdrop, high performance touch & keyboard support
   ========================================================================== */

.lightbox {
  position: fixed;
  inset: 0;
  background-color: #000000;
  z-index: 1000;
  display: flex;
  flex-direction: column;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 200ms ease, visibility 200ms ease;
  user-select: none;
  -webkit-user-select: none;
}

.lightbox.active {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

/* Lightbox Top Control Bar */
.lightbox-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md) var(--space-lg);
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  z-index: 10;
  background: linear-gradient(to bottom, rgba(0, 0, 0, 0.7) 0%, transparent 100%);
}

.lightbox-counter {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
}

.lightbox-controls {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.lightbox-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 2px;
  color: var(--text-primary);
  background: rgba(20, 20, 20, 0.6);
  border: 1px solid var(--border-subtle);
  transition: background-color var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast);
}

.lightbox-btn:hover {
  background: rgba(40, 40, 40, 0.9);
  border-color: var(--border-medium);
}

.lightbox-btn:active {
  transform: scale(0.96);
}

.lightbox-btn svg {
  width: 20px;
  height: 20px;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
  fill: none;
}

/* Main Image Viewport Area */
.lightbox-viewport {
  flex: 1;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  padding: var(--space-xl) var(--space-md);
}

@media (min-width: 768px) {
  .lightbox-viewport {
    padding: var(--space-3xl) var(--space-2xl);
  }
}

.lightbox-stage {
  max-width: 100%;
  max-height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  transition: transform var(--transition-fast);
}

.lightbox-image {
  max-width: 96vw;
  max-height: 82vh;
  width: auto;
  height: auto;
  object-fit: contain;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.9);
  opacity: 0;
  transition: opacity 250ms ease, transform 250ms ease;
}

.lightbox-image.loaded {
  opacity: 1;
}

/* Nav Arrows (Floating on Left & Right) */
.lightbox-nav-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 52px;
  height: 64px;
  background: rgba(12, 12, 12, 0.5);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10;
  transition: all var(--transition-fast);
}

.lightbox-nav-btn:hover {
  color: var(--text-primary);
  background: rgba(28, 28, 28, 0.85);
  border-color: var(--border-medium);
}

.lightbox-prev {
  left: var(--space-md);
}

.lightbox-next {
  right: var(--space-md);
}

@media (max-width: 768px) {
  .lightbox-nav-btn {
    display: none; /* Mobile uses natural touch swipe gestures */
  }
}

/* Lightbox Bottom Caption Bar */
.lightbox-bottombar {
  padding: var(--space-sm) var(--space-lg) var(--space-md);
  text-align: center;
  background: linear-gradient(to top, rgba(0, 0, 0, 0.8) 0%, transparent 100%);
  z-index: 10;
}

.lightbox-caption {
  font-size: 0.85rem;
  color: var(--text-secondary);
  max-width: 760px;
  margin: 0 auto;
  letter-spacing: 0.02em;
}

/* Loading Spinner */
.lightbox-loader {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 32px;
  height: 32px;
  border: 2px solid var(--border-subtle);
  border-top-color: var(--text-primary);
  border-radius: 50%;
  animation: lb-spin 0.8s linear infinite;
  opacity: 0;
  pointer-events: none;
  transition: opacity 150ms ease;
}

.lightbox-loader.visible {
  opacity: 1;
}

@keyframes lb-spin {
  to { transform: translate(-50%, -50%) rotate(360deg); }
}