/* ═══════════════════════════════════════════════════════════════════════════
   ScholarFlow Travelogue Gallery v2
   Refined lightbox and grid for the travelogue photo collection
   ═══════════════════════════════════════════════════════════════════════════ */

/* ── Grid Layout ─────────────────────────────────────────────────────────── */

.gallery-grid {
  display: grid !important;
  grid-template-columns: repeat(2, minmax(0, 1fr)) !important;
  gap: var(--sf-space-4, 1rem);
  padding: var(--sf-space-4, 1rem) 0;
  width: 100%;
  box-sizing: border-box;
}

.gallery-item {
  min-width: 0;
}

/* ── Gallery Item ────────────────────────────────────────────────────────── */

.gallery-item {
  position: relative;
  aspect-ratio: 1;
  overflow: hidden;
  border-radius: var(--sf-radius-md, 10px);
  box-shadow: var(--sf-shadow-sm, 0 1px 3px rgba(0,0,0,0.08));
  transition: transform var(--sf-transition-base, 250ms cubic-bezier(0.4,0,0.2,1)),
              box-shadow var(--sf-transition-base, 250ms cubic-bezier(0.4,0,0.2,1));
  cursor: pointer;
  background: var(--sf-surface-subtle, #f1f5f9);
}

.gallery-item:hover {
  transform: translateY(-4px) scale(1.01);
  box-shadow: var(--sf-shadow-lg, 0 10px 20px rgba(0,0,0,0.08));
}

.gallery-item::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(0,0,0,0.5) 0%, transparent 50%);
  opacity: 0;
  transition: opacity var(--sf-transition-base, 250ms);
  z-index: 1;
  pointer-events: none;
}

.gallery-item:hover::before {
  opacity: 1;
}

/* ── Thumbnail ───────────────────────────────────────────────────────────── */

.gallery-thumbnail {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--sf-transition-slow, 350ms cubic-bezier(0.4,0,0.2,1));
}

.gallery-item:hover .gallery-thumbnail {
  transform: scale(1.08);
}

/* ── Caption ─────────────────────────────────────────────────────────────── */

.gallery-caption {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: var(--sf-space-4, 1rem);
  background: linear-gradient(to top, rgba(0,0,0,0.75) 0%, transparent 100%);
  color: #ffffff;
  font-family: var(--sf-font-sans, "Source Sans Pro", sans-serif);
  font-size: 0.85rem;
  line-height: 1.5;
  opacity: 0;
  transform: translateY(8px);
  transition: opacity var(--sf-transition-base, 250ms),
              transform var(--sf-transition-base, 250ms);
  z-index: 2;
  pointer-events: none;
}

.gallery-item:hover .gallery-caption {
  opacity: 1;
  transform: translateY(0);
}

/* ── Lightbox ────────────────────────────────────────────────────────────── */

.lightbox {
  display: none;
  position: fixed;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.92);
  backdrop-filter: blur(8px);
  z-index: 100000;
  opacity: 0;
  transition: opacity var(--sf-transition-base, 250ms);
  padding: var(--sf-space-5, 1.5rem);
  align-items: center;
  justify-content: center;
}

.lightbox.active {
  display: flex;
  opacity: 1;
}

.lightbox-content {
  position: relative;
  max-width: 92vw;
  max-height: 90vh;
  background: var(--sf-surface, #ffffff);
  border-radius: var(--sf-radius-lg, 16px);
  overflow: hidden;
  transform: scale(0.92);
  transition: transform var(--sf-transition-base, 250ms);
  box-shadow: 0 25px 50px rgba(0,0,0,0.4);
  display: flex;
  flex-direction: column;
}

.lightbox.active .lightbox-content {
  transform: scale(1);
}

.lightbox-image {
  max-width: 100%;
  max-height: 78vh;
  object-fit: contain;
  flex: 1;
  background: #000;
}

.lightbox-caption {
  padding: var(--sf-space-4, 1rem) var(--sf-space-5, 1.5rem);
  background: var(--sf-surface, #ffffff);
  color: var(--sf-text-secondary, #4a5568);
  font-family: var(--sf-font-sans, "Source Sans Pro", sans-serif);
  font-size: 0.95rem;
  line-height: 1.6;
  max-height: 18vh;
  overflow-y: auto;
}

/* ── Lightbox Close Button ───────────────────────────────────────────────── */

.lightbox-close {
  position: absolute;
  top: var(--sf-space-4, 1rem);
  right: var(--sf-space-4, 1rem);
  width: 2.75rem;
  height: 2.75rem;
  background: var(--sf-surface, #ffffff);
  color: var(--sf-text-secondary, #4a5568);
  border-radius: var(--sf-radius-full, 9999px);
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  line-height: 1;
  box-shadow: var(--sf-shadow-md, 0 4px 12px rgba(0,0,0,0.15));
  transition: all var(--sf-transition-fast, 150ms);
  z-index: 10;
}

.lightbox-close:hover {
  background: var(--sf-surface-elevated, #f8f9fa);
  color: var(--sf-text-primary, #1a202c);
  transform: scale(1.1) rotate(90deg);
}

.lightbox-close:active {
  transform: scale(0.95);
}

/* ── Responsive ──────────────────────────────────────────────────────────── */

@media (max-width: 768px) {
  .gallery-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--sf-space-3, 0.75rem);
  }

  .lightbox {
    padding: var(--sf-space-3, 0.75rem);
  }

  .lightbox-content {
    max-width: 96vw;
    border-radius: var(--sf-radius-md, 10px);
  }

  .lightbox-image {
    max-height: 70vh;
  }

  .lightbox-caption {
    padding: var(--sf-space-3, 0.75rem);
    font-size: 0.85rem;
  }
}

@media (max-width: 480px) {
  .gallery-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--sf-space-2, 0.5rem);
  }
}