/* ============================================
   Gallery Page — Curated Exhibition Style
   ============================================ */

/* --- Gallery Header --- */
.gallery-header {
  padding: 10rem var(--gutter) 4rem;
  text-align: center;
}

.gallery-header-inner {
  max-width: 600px;
  margin: 0 auto;
}

.gallery-title {
  font-family: var(--font-serif);
  font-size: var(--text-hero);
  font-weight: 500;
  line-height: 1.05;
  letter-spacing: -0.03em;
  margin-bottom: var(--space-md);
}

.gallery-subtitle {
  font-size: var(--text-lg);
  color: var(--text-secondary);
  line-height: 1.7;
}

/* --- Filter Bar --- */
.filter-bar {
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  padding: 0 var(--gutter) var(--space-xl);
  flex-wrap: wrap;
}

.filter-btn {
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  font-weight: 500;
  padding: 0.6rem 1.5rem;
  border-radius: 100px;
  border: 1px solid var(--border-medium);
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.4s var(--ease-spring);
}

.filter-btn:hover {
  color: var(--text-primary);
  border-color: var(--text-primary);
}

.filter-btn.active {
  background: var(--text-primary);
  color: var(--text-inverse);
  border-color: var(--text-primary);
}

.filter-btn.active:hover {
  background: var(--accent);
  border-color: var(--accent);
}

/* --- Gallery Grid --- */
.gallery-grid {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--gutter) var(--space-3xl);
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
}

/* --- Gallery Item --- */
.gallery-item {
  position: relative;
  border-radius: 1rem;
  overflow: hidden;
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  transition: transform 0.5s var(--ease-spring),
              box-shadow 0.5s var(--ease-out-quart),
              opacity 0.5s var(--ease-out-expo);
  cursor: pointer;
}

.gallery-item.hidden {
  display: none;
}

.gallery-item-inner {
  position: relative;
  overflow: hidden;
  aspect-ratio: 1 / 1;
}

.gallery-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.7s var(--ease-out-expo);
}

.gallery-item:hover img {
  transform: scale(1.06);
}

.gallery-item:hover {
  transform: translateY(-4px);
  box-shadow: 0 20px 50px rgba(26, 22, 18, 0.1);
  border-color: var(--accent);
}

/* --- Overlay --- */
.gallery-item-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to top,
    rgba(26, 22, 18, 0.7) 0%,
    rgba(26, 22, 18, 0) 50%
  );
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  padding: var(--space-md);
  opacity: 0;
  transition: opacity 0.4s var(--ease-out-quart);
}

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

.gallery-item-caption {
  font-family: var(--font-serif);
  font-size: var(--text-lg);
  font-weight: 500;
  color: white;
}

.gallery-item-expand {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  color: white;
  transform: translateY(8px);
  transition: transform 0.4s var(--ease-spring),
              background 0.3s ease;
}

.gallery-item:hover .gallery-item-expand {
  transform: translateY(0);
}

.gallery-item-expand:hover {
  background: rgba(255, 255, 255, 0.25);
}

/* --- Lightbox --- */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 100;
  background: rgba(10, 8, 6, 0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.4s var(--ease-out-expo),
              visibility 0.4s;
}

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

.lightbox-close {
  position: absolute;
  top: 2rem;
  right: 2rem;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.15);
  background: rgba(255, 255, 255, 0.05);
  color: white;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.4s var(--ease-spring),
              background 0.3s ease,
              border-color 0.3s ease;
}

.lightbox-close:hover {
  transform: scale(1.1);
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.3);
}

.lightbox-nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 52px;
  height: 52px;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.1);
  background: rgba(255, 255, 255, 0.03);
  color: rgba(255, 255, 255, 0.7);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.4s var(--ease-spring),
              background 0.3s ease,
              color 0.3s ease,
              border-color 0.3s ease;
}

.lightbox-nav:hover {
  transform: translateY(-50%) scale(1.1);
  background: rgba(255, 255, 255, 0.08);
  color: white;
  border-color: rgba(255, 255, 255, 0.25);
}

.lightbox-prev {
  left: 2rem;
}

.lightbox-next {
  right: 2rem;
}

.lightbox-content {
  max-width: 85vw;
  max-height: 85vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-md);
  transform: scale(0.95);
  transition: transform 0.5s var(--ease-out-expo);
}

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

.lightbox-img {
  max-width: 100%;
  max-height: 75vh;
  border-radius: 0.75rem;
  object-fit: contain;
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.4);
  transition: transform 0.5s var(--ease-out-expo);
}

.lightbox-caption {
  font-family: var(--font-serif);
  font-size: var(--text-lg);
  color: rgba(255, 255, 255, 0.8);
  text-align: center;
}

/* --- Back Button --- */
.back-btn {
  position: fixed;
  top: 2rem;
  left: 2rem;
  z-index: 45;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-secondary);
  text-decoration: none;
  padding: 0.55rem 1.1rem;
  border-radius: 100px;
  border: 1px solid var(--border-medium);
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: color 0.3s ease,
              border-color 0.3s ease,
              transform 0.3s var(--ease-spring);
}

.back-btn:hover {
  color: var(--accent);
  border-color: var(--accent);
  transform: scale(1.04);
}

/* --- Footer (override for gallery page) --- */
.gallery-page .footer {
  margin-top: 0;
}

/* --- Responsive --- */
@media (max-width: 1024px) {
  .gallery-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .gallery-header {
    padding-top: 8rem;
  }

  .gallery-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-sm);
  }

  .gallery-item-overlay {
    padding: var(--space-sm);
  }

  .gallery-item-caption {
    font-size: var(--text-base);
  }

  .lightbox-nav {
    width: 40px;
    height: 40px;
  }

  .lightbox-prev {
    left: 1rem;
  }

  .lightbox-next {
    right: 1rem;
  }

  .lightbox-close {
    top: 1rem;
    right: 1rem;
    width: 40px;
    height: 40px;
  }

  .back-btn {
    top: 1rem;
    left: 1rem;
    padding: 0.4rem 0.9rem;
    font-size: var(--text-xs);
  }
}

@media (max-width: 480px) {
  .gallery-grid {
    grid-template-columns: 1fr;
  }

  .filter-bar {
    gap: 0.35rem;
  }

  .filter-btn {
    padding: 0.5rem 1.1rem;
    font-size: var(--text-xs);
  }
}