/* ==========================================================================
   ISLA Gallery Page Stylesheet
   Immersive Dark Hero, Category Filters, Masonry Grid & Fullscreen Lightbox
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Immersive Hero with Crossfade Background
   -------------------------------------------------------------------------- */
.gallery-hero {
  position: relative;
  min-height: 65vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  color: var(--color-text-on-dark);
  padding: calc(80px + var(--space-8)) var(--space-4) var(--space-8);
  overflow: hidden;
  background-color: var(--color-bg-dark);
}

.gallery-hero-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-size: cover;
  background-position: center;
  opacity: 0.25;
  transition: opacity 1.2s ease-in-out, transform 8s ease-out;
  transform: scale(1.05);
  z-index: 1;
}

.gallery-hero-bg.active {
  opacity: 0.35;
  transform: scale(1);
}

.gallery-hero-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(circle at center, rgba(37, 58, 124, 0.75) 0%, rgba(30, 48, 106, 0.96) 100%);
  z-index: 2;
}

.gallery-hero-content {
  position: relative;
  z-index: 3;
  max-width: 780px;
  margin: 0 auto;
}

.gallery-hero-title {
  font-family: var(--font-serif);
  font-size: var(--font-display);
  font-weight: 700;
  line-height: 1.1;
  color: #FFFFFF;
  margin-bottom: var(--space-3);
}

.gallery-hero-title .gold-text {
  color: var(--color-accent);
}

.gallery-hero-sub {
  font-family: var(--font-sans);
  font-size: var(--font-size-body);
  color: var(--color-text-on-dark-secondary);
  line-height: 1.6;
}

/* --------------------------------------------------------------------------
   2. Category Filter Navigation Bar
   -------------------------------------------------------------------------- */
.gallery-filter-section {
  background-color: var(--color-bg-light);
  padding: var(--space-6) 0 var(--space-4);
  position: sticky;
  top: 72px;
  z-index: 99;
  border-bottom: 1px solid var(--color-border-light);
}

.filter-pills-wrapper {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.filter-btn {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border-light);
  padding: 8px 18px;
  border-radius: 50px;
  font-family: var(--font-sans);
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: var(--transition-smooth);
}

.filter-btn:hover {
  border-color: var(--color-bg-dark);
  color: var(--color-bg-dark);
}

.filter-btn.active {
  background-color: var(--color-bg-dark);
  border-color: var(--color-bg-dark);
  color: var(--color-accent);
  box-shadow: 0 4px 12px rgba(37, 58, 124, 0.2);
}

/* --------------------------------------------------------------------------
   3. Masonry Grid Layout
   -------------------------------------------------------------------------- */
.gallery-grid-section {
  background-color: var(--color-bg-light);
  padding-top: var(--space-6);
  padding-bottom: var(--space-16);
}

.masonry-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
}

@media (min-width: 600px) {
  .masonry-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .masonry-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.gallery-tile {
  position: relative;
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.04);
  background-color: #E2E1DC;
  cursor: pointer;
  transition: transform var(--duration-fast) var(--ease-out-expo), box-shadow var(--duration-fast) var(--ease-out-expo);
  height: 280px;
}

.gallery-tile.tall {
  height: 380px;
}

.gallery-tile.wide {
  height: 280px;
}

@media (min-width: 1024px) {
  .gallery-tile.wide {
    grid-column: span 2;
  }
}

.gallery-tile img,
.gallery-tile video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.8s var(--ease-out-expo);
}

.gallery-tile:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 36px rgba(37, 58, 124, 0.14);
}

.gallery-tile:hover img {
  transform: scale(1.05);
}

.tile-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(0deg, rgba(30, 48, 106, 0.88) 0%, rgba(30, 48, 106, 0.2) 60%, transparent 100%);
  opacity: 0;
  transition: opacity var(--duration-fast) var(--ease-out-expo);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: var(--space-4);
  color: #FFFFFF;
}

.gallery-tile:hover .tile-overlay {
  opacity: 1;
}

.tile-category-tag {
  font-family: var(--font-sans);
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--color-accent);
  margin-bottom: 4px;
}

.tile-caption {
  font-family: var(--font-serif);
  font-size: 15px;
  line-height: 1.3;
  color: #FFFFFF;
}

.tile-zoom-icon {
  position: absolute;
  top: var(--space-3);
  right: var(--space-3);
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: rgba(255, 202, 23, 0.9);
  color: var(--color-text-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  transform: scale(0.7);
  opacity: 0;
  transition: transform var(--duration-fast) var(--ease-out-expo), opacity var(--duration-fast) var(--ease-out-expo);
}

.gallery-tile:hover .tile-zoom-icon {
  transform: scale(1);
  opacity: 1;
}

/* Video Tile Special Indicator */
.tile-video-indicator {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: rgba(37, 58, 124, 0.85);
  border: 2px solid var(--color-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-accent);
  font-size: 18px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
  pointer-events: none;
}

/* --------------------------------------------------------------------------
   4. Fullscreen Lightbox Modal
   -------------------------------------------------------------------------- */
.lightbox-modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-color: rgba(13, 19, 33, 0.95);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  z-index: 1050;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--duration-fast) var(--ease-out-expo), visibility var(--duration-fast) var(--ease-out-expo);
}

.lightbox-modal.active {
  opacity: 1;
  visibility: visible;
}

.lightbox-container {
  position: relative;
  max-width: 90vw;
  max-height: 85vh;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.lightbox-media-wrapper {
  max-width: 100%;
  max-height: 75vh;
  border-radius: 4px;
  overflow: hidden;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.5);
  border: 1px solid var(--color-border-dark);
}

.lightbox-media-wrapper img {
  max-width: 100%;
  max-height: 75vh;
  object-fit: contain;
  display: block;
}

.lightbox-media-wrapper video {
  max-width: 100%;
  max-height: 75vh;
  display: block;
}

.lightbox-caption-bar {
  margin-top: var(--space-3);
  text-align: center;
}

.lightbox-caption-text {
  font-family: var(--font-serif);
  font-size: 16px;
  color: #FFFFFF;
}

.lightbox-counter {
  font-family: var(--font-sans);
  font-size: 11px;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  margin-top: 4px;
  display: block;
}

/* Close & Navigation Buttons */
.lightbox-close {
  position: absolute;
  top: 24px;
  right: 24px;
  width: 44px;
  height: 44px;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid var(--color-border-dark);
  border-radius: 50%;
  color: #FFFFFF;
  font-size: 18px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition-smooth);
  z-index: 1060;
}

.lightbox-close:hover {
  background: var(--color-accent);
  color: var(--color-text-primary);
  transform: rotate(90deg);
}

.lightbox-nav-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 48px;
  height: 48px;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid var(--color-border-dark);
  border-radius: 50%;
  color: #FFFFFF;
  font-size: 16px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition-smooth);
  z-index: 1060;
}

.lightbox-nav-btn:hover {
  background: var(--color-accent);
  color: var(--color-text-primary);
}

.lightbox-prev {
  left: 20px;
}

.lightbox-next {
  right: 20px;
}