.photo-grid {
  --photo-grid-bg-primary: var(--bs-gray-100);
  --photo-grid-bg-secondary: var(--bs-white);
  --photo-grid-text-primary: var(--bs-gray-900);
  --photo-grid-text-secondary: var(--bs-gray-600);
  --photo-grid-accent: #4299e1;
  --photo-grid-accent-hover: #3182ce;
  --photo-grid-border-color: var(--bs-gray-300);
  --photo-grid-shadow-sm: 0 2px 8px rgba(var(--bs-dark-rgb), 0.06);
  --photo-grid-shadow-md: 0 4px 12px rgba(var(--bs-dark-rgb), 0.08);
  --photo-grid-shadow-lg: 0 8px 24px rgba(var(--bs-dark-rgb), 0.12);
  --photo-grid-border-radius: 6px;
  --photo-grid-spacing-xs: 0.5rem;
  --photo-grid-spacing-sm: 1rem;
  --photo-grid-spacing-md: 1.5rem;
  --photo-grid-spacing-lg: 2rem;
  --photo-grid-spacing-xl: 3rem;
  --photo-grid-max-width: 1200px;
  --photo-grid-gap: 24px;
}

.photo-grid {
  font-family: var(--bs-font-sans-serif);
  background-color: var(--photo-grid-bg-primary);
  min-height: 100vh;
  padding: var(--photo-grid-spacing-lg) var(--photo-grid-spacing-sm);
}

@media (min-width: 768px) {
  .photo-grid {
    padding: var(--photo-grid-spacing-xl) var(--photo-grid-spacing-md);
  }
}

.photo-grid .container {
  max-width: var(--photo-grid-max-width);
  margin: 0 auto;
}

.photo-grid .gallery-header {
  text-align: center;
  margin-bottom: var(--photo-grid-spacing-xl);
}

.photo-grid .gallery-title {
  font-size: 2rem;
  font-weight: 700;
  color: var(--photo-grid-text-primary);
  margin-bottom: var(--photo-grid-spacing-xs);
  letter-spacing: -0.5px;
}

@media (min-width: 768px) {
  .photo-grid .gallery-title {
    font-size: 2.5rem;
  }
}

.photo-grid .gallery-subtitle {
  font-size: 1.125rem;
  color: var(--photo-grid-text-secondary);
  margin: 0;
}

.photo-grid .filter-bar {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--photo-grid-spacing-sm);
  margin-bottom: var(--photo-grid-spacing-xl);
}

.photo-grid .filter-btn {
  padding: 0.5rem 1.25rem;
  border: 2px solid var(--photo-grid-border-color);
  border-radius: 50px;
  background-color: var(--photo-grid-bg-secondary);
  color: var(--photo-grid-text-primary);
  font-size: 0.9375rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: var(--photo-grid-shadow-sm);
}

.photo-grid .filter-btn:hover {
  border-color: var(--photo-grid-accent);
  color: var(--photo-grid-accent);
  transform: translateY(-2px);
  box-shadow: var(--photo-grid-shadow-md);
}

.photo-grid .filter-btn.active {
  background-color: var(--photo-grid-accent);
  border-color: var(--photo-grid-accent);
  color: var(--bs-white);
  box-shadow: var(--photo-grid-shadow-md);
}

.photo-grid .filter-btn.active:hover {
  background-color: var(--photo-grid-accent-hover);
  border-color: var(--photo-grid-accent-hover);
  transform: translateY(-2px);
}

.photo-grid .grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--photo-grid-gap);
  margin-bottom: var(--photo-grid-spacing-lg);
  transition: opacity 0.3s ease;
}

.photo-grid .grid.loading {
  opacity: 0;
}

@media (min-width: 576px) {
  .photo-grid .grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 992px) {
  .photo-grid .grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 1200px) {
  .photo-grid .grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.photo-grid .grid.muuri {
  position: relative;
  display: block;
}

.photo-grid .grid-item {
  transition: all 0.4s ease;
}

.photo-grid .grid.muuri .grid-item {
  position: absolute;
  width: 100%;
}

@media (min-width: 576px) {
  .photo-grid .grid.muuri .grid-item {
    width: 50%;
  }
}

@media (min-width: 992px) {
  .photo-grid .grid.muuri .grid-item {
    width: 33.333%;
  }
}

@media (min-width: 1200px) {
  .photo-grid .grid.muuri .grid-item {
    width: 25%;
  }
}

.photo-grid .item-content {
  overflow: hidden;
  border-radius: var(--photo-grid-border-radius);
  background-color: var(--photo-grid-bg-secondary);
  box-shadow: var(--photo-grid-shadow-sm);
  transition: all 0.4s ease;
}

.photo-grid .grid.muuri .item-content {
  margin: calc(var(--photo-grid-gap) / 2);
}

.photo-grid .grid-item:hover .item-content {
  transform: translateY(-4px);
  box-shadow: var(--photo-grid-shadow-lg);
}

.photo-grid .item-content img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.5s ease;
}

.photo-grid .grid-item:hover .item-content img {
  transform: scale(1.05);
}