$duration: 5s;

$side-length: 50px;
$cube-length: $side-length * 5;

$lighter-side: $grey-blue;
$darker-side: darken($lighter-side, 15%);

.loading-spinner {
  width: 100%;

  .cube-and-logo {
    position: relative;
    margin: 100px auto;
    width: $cube-length;
    height: $cube-length;
  }

  .logo-container {
    position: absolute;
    width: $cube-length;
    height: $cube-length;
    top: 0;
    left: 0;

    display: flex;
    justify-content: center;
    align-items: center;

    .icon {
      width: 32%;
      height: 32%;
      transform: translateY(-20px);
      fill: white;
      animation: n-fade $duration forwards infinite;
    }
  }

  .cube {
    width: $cube-length;
    height: $cube-length;
    transform-style: preserve-3d;
    animation: cube-spin $duration forwards infinite;
  }

  @media (prefers-reduced-motion) {
    .cube {
      animation-iteration-count: 0;
    }
  }

  &.paused {
    .cube,
    .side-4,
    .logo-container .icon {
      animation-play-state: paused;
    }
  }

  .side {
    width: $side-length;
    height: $side-length;
    position: absolute;
    background: $lighter-side;
  }

  .side-1 {
    top: $side-length;
    left: $side-length * 2;
    transform-origin: 50% 100%;
    transform: rotateX(-90deg);
  }

  .side-2 {
    top: $side-length * 3;
    left: $side-length * 2;
    transform-origin: 50% 0%;
    transform: rotateX(90deg);
  }

  .side-3 {
    top: $side-length * 2;
    left: $side-length;
    transform-origin: 100% 50%;
    transform: rotateY(90deg);
  }

  .side-4 {
    top: $side-length * 2;
    left: $side-length * 2;
    transform-origin: 100% 50%;
    transform: rotateY(90deg);
    animation: darker-side-fade $duration forwards infinite;
  }
}

$rotateX: 55deg;
$rotateY: 45deg;

@keyframes cube-spin {
  0% {
    transform: rotateX($rotateX) rotate($rotateY) rotateZ(360deg);
  }

  30% {
    transform: rotateX($rotateX) rotate($rotateY) rotateZ(0deg);
  }

  70% {
    transform: rotateX($rotateX) rotate($rotateY) rotateZ(0deg);
  }

  100% {
    transform: rotateX($rotateX) rotate($rotateY) rotateZ(360deg);
  }
}

@keyframes darker-side-fade {
  30% {
    background: $lighter-side;
  }

  35% {
    background: $darker-side;
  }

  65% {
    background: $darker-side;
  }

  70% {
    background: $lighter-side;
  }
}

@keyframes n-fade {
  0% {
    opacity: 0;
  }

  40% {
    opacity: 0;
  }

  45% {
    opacity: 1;
  }

  65% {
    opacity: 1;
  }

  70% {
    opacity: 0;
  }

  100% {
    opacity: 0;
  }
}