.photo-grid {
  display: block;
}

.photo-grid a {
  display: block;
  width: calc(25% - 8px);
  margin: 0 4px 8px 4px;
  opacity: 0;
  transform: scale(0.95);
  transition: opacity 0.6s ease;
}

.photo-grid a.loaded {
  opacity: 1;
  transform: scale(1);
}

.photo-grid img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 6px;
  object-fit: cover;
}

#gallery-spinner {
  position: fixed;
  top: 50%;
  left: 50%;
  width: 48px;
  height: 48px;
  margin: -24px 0 0 -24px;
  border: 4px solid #ccc;
  border-top: 4px solid #333;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  z-index: 9999;
}

@keyframes spin {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}

#gallery-spinner.hidden {
  display: none;
}

@media (max-width: 1200px) {
  .photo-grid a {
    width: 33.333%;
  }
}

@media (max-width: 800px) {
  .photo-grid a {
    width: 50%;
  }
}

@media (max-width: 500px) {
  .photo-grid a {
    width: 100%;
  }
}