/**
 * ==============================================
 * Experimental: Gooey Effect
 * Dot Shuttle
 * ==============================================
 */

@d: 3 * @dot-spacing;
@dot-color-hsl: hsl(0, 100%, 0%);

.dot-shuttle {
  .dot(@width: 12px, @height: 12px, @radius: 6px, @bg-color: @dot-color-hsl, @color: transparent);

  position: relative;
  left: -@dot-spacing;
  margin: -1px 0;
  filter: blur(2px);

  &::before,
  &::after {
    .dot(@width: 12px, @height: 12px, @radius: 6px, @bg-color: @dot-color-hsl, @color: transparent);

    content: '';
    display: inline-block;
    position: absolute;
    top: 0;
    filter: blur(2px);
  }

  &::before {
    left: @dot-spacing;
    animation: dot-shuttle 2s infinite ease-out;
  }

  &::after {
    left: 2 * @dot-spacing;
  }
}

@keyframes dot-shuttle {
  0%,
  50%,
  100% {
    transform: translateX(0);
  }

  25% {
    transform: translateX(-@d);
  }

  75% {
    transform: translateX(@d);
  }
}