.mx-auto {
  margin-left: auto;
  margin-right: auto;
}

@keyframes pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.5;
  }
}

.animate-pulse {
  animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

.upside-down {
  display: inline-block;
  transform: rotate(180deg);
}

.container-404 {
  margin: 10px auto;
  max-width: 600px;
  text-align: center;
}

.container-404 h1 {
  margin: 30px 0;
  font-size: 4em;
  line-height: 1;
  letter-spacing: -1px;
}

.photo-item a,
.photo-preview-thumb {
  display: block;
  position: relative;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  background: var(--color-border);
  transition: opacity 0.2s ease;
}

.photo-item a:hover,
.photo-preview-thumb:hover {
  opacity: 0.85;
}

.photo-item a img,
.photo-preview-thumb img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}