/* ==========================================================================
   Gallery Page Styles
   Styles for the Gallery/Portfolio page: filter buttons, responsive grid
   layout, and gallery item animations.
   Page header styles are in base.css (shared component).
   Requirements: 10.1, 10.2, 10.3, 10.6, 10.7, 16.6
   ========================================================================== */

/* ==========================================================================
   Gallery Filter Buttons
   Horizontal row of category filter buttons with active state.
   ========================================================================== */

.gallery__filters {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-2xl);
}

.gallery__filter-btn {
  padding: 0.625rem 1.25rem;
  font-family: var(--font-body);
  font-size: var(--fs-small);
  font-weight: var(--fw-medium);
  color: var(--color-text-secondary);
  background-color: var(--color-bg-secondary);
  border: 1px solid var(--color-bg-tertiary);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-base);
  min-height: 44px;
  min-width: 44px;
}

.gallery__filter-btn:hover,
.gallery__filter-btn:focus {
  color: var(--color-accent);
  border-color: var(--color-accent);
  background-color: rgba(212, 175, 55, 0.1);
}

.gallery__filter-btn:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.gallery__filter-btn--active {
  color: var(--color-bg-primary);
  background-color: var(--color-accent);
  border-color: var(--color-accent);
}

.gallery__filter-btn--active:hover,
.gallery__filter-btn--active:focus {
  color: var(--color-bg-primary);
  background-color: var(--color-accent-hover);
  border-color: var(--color-accent-hover);
}

/* ==========================================================================
   Gallery Grid
   Responsive grid layout for gallery items.
   Mobile: 1 column, Tablet: 2 columns, Desktop: 3 columns.
   ========================================================================== */

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

.gallery__item {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-md);
  background-color: var(--color-bg-secondary);
  cursor: pointer;
  opacity: 1;
  transform: scale(1);
  transition: opacity 400ms ease, transform 400ms ease;
}

.gallery__item--hidden {
  opacity: 0;
  transform: scale(0.8);
  position: absolute;
  pointer-events: none;
  width: 0;
  height: 0;
  overflow: hidden;
  margin: 0;
  padding: 0;
  border: 0;
}

.gallery__item img {
  display: block;
  width: 100%;
  height: 250px;
  object-fit: cover;
  transition: transform var(--transition-base);
}

.gallery__item:hover img {
  transform: scale(1.05);
}

.gallery__item:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.gallery__item:focus-visible img {
  transform: scale(1.05);
}

.gallery__item::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(to top, rgba(0, 0, 0, 0.5) 0%, transparent 50%);
  opacity: 0;
  transition: opacity var(--transition-base);
  pointer-events: none;
}

.gallery__item:hover::after {
  opacity: 1;
}

/* ==========================================================================
   Responsive - Tablet (769px+)
   ========================================================================== */

@media screen and (min-width: 769px) {
  .gallery__grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .gallery__item img {
    height: 280px;
  }

  .gallery__filters {
    gap: var(--space-md);
  }

  .gallery__filter-btn {
    padding: 0.75rem 1.5rem;
    font-size: var(--fs-body);
  }
}

/* ==========================================================================
   Responsive - Desktop (1025px+)
   ========================================================================== */

@media screen and (min-width: 1025px) {
  .gallery__grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .gallery__item img {
    height: 300px;
  }
}

/* ==========================================================================
   Reduced Motion
   Disable complex animations for users who prefer reduced motion.
   ========================================================================== */

@media (prefers-reduced-motion: reduce) {
  .gallery__item {
    transition: none;
  }

  .gallery__item img {
    transition: none;
  }
}