* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --gap: 0.5em;
  --indexSize: calc(1vh + 1vw);
  --color-dark: #000;
}

@-webkit-keyframes loading {
  0% {
    opacity: 0;
  }
  50% {
    opacity: 1;
  }
  100% {
    opacity: 0;
  }
}

@keyframes loading {
  0% {
    opacity: 0;
  }
  50% {
    opacity: 1;
  }
  100% {
    opacity: 0;
  }
}
body {
  overflow: hidden;
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
}

.header {
  text-transform: uppercase;
  font-family: "Lucida Sans", "Lucida Sans Regular", "Lucida Grande", "Lucida Sans Unicode", Geneva, Verdana, sans-serif;
  letter-spacing: 0.1em;
  font-size: calc(var(--indexSize) * 2);
  position: absolute;
  font-weight: 200;
  opacity: 0.9;
  margin-top: 0.2em;
}
.header span {
  display: block;
  font-family: Helvetica, sans-serif;
  font-size: calc(var(--indexSize) * 0.75);
  margin-top: 5px;
  -webkit-animation: loading 1.8s infinite;
          animation: loading 1.8s infinite;
}

.gallery {
  width: 30vw;
  -moz-column-width: 2em;
       column-width: 2em;
  gap: var(--gap);
  transform: scale(10);
  will-change: transform;
  transition: transform 1s cubic-bezier(0.075, 1, 0.25, 1), opacity 1s;
  opacity: 0;
}
.gallery__item {
  margin-bottom: var(--gap);
  transform: scale(1.001);
  will-change: transform;
  transition: 0.3s;
}
.gallery__item img {
  width: 100%;
  height: 100%;
  display: block;
}
.gallery__item:hover {
  transform: scale(1.03);
}

.loaded .gallery {
  opacity: 1;
}
.loaded .header span {
  visibility: hidden;
}

@media (prefers-color-scheme: dark) {
  body {
    background-color: var(--color-dark);
  }
  body .header {
    filter: invert(100%);
  }
}