.loader {
  position: relative;
  animation: rotate 1s infinite;
}

.loader::before,
.loader::after {
  border-radius: 50%;
  content: "";
  display: block;
  /* 40% of container size */
  height: 40%;
  width: 40%;
}

.loader::before {
  animation: ball1 1s infinite;
  background-color: #a1a1aa; /* zinc-400 */
  box-shadow: calc(var(--spacing)) 0 0 #18181b; /* zinc-900 */
  margin-bottom: calc(var(--gap));
}

.loader::after {
  animation: ball2 1s infinite;
  background-color: #18181b; /* zinc-900 */
  box-shadow: calc(var(--spacing)) 0 0 #a1a1aa; /* zinc-400 */
}

@keyframes rotate {
  0% {
    transform: rotate(0deg) scale(0.8);
  }
  50% {
    transform: rotate(360deg) scale(1.2);
  }
  100% {
    transform: rotate(720deg) scale(0.8);
  }
}

@keyframes ball1 {
  0% {
    box-shadow: calc(var(--spacing)) 0 0 #18181b;
  }
  50% {
    box-shadow: 0 0 0 #18181b;
    margin-bottom: 0;
    transform: translate(calc(var(--spacing) / 2), calc(var(--spacing) / 2));
  }
  100% {
    box-shadow: calc(var(--spacing)) 0 0 #18181b;
    margin-bottom: calc(var(--gap));
  }
}

@keyframes ball2 {
  0% {
    box-shadow: calc(var(--spacing)) 0 0 #a1a1aa;
  }
  50% {
    box-shadow: 0 0 0 #a1a1aa;
    margin-top: calc(var(--ball-size) * -1);
    transform: translate(calc(var(--spacing) / 2), calc(var(--spacing) / 2));
  }
  100% {
    box-shadow: calc(var(--spacing)) 0 0 #a1a1aa;
    margin-top: 0;
  }
}