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

$dot-color-hsl: hsl(0, 100%, 0%);

$r: $dot-spacing;
$origin-x: $dot-width * .5;
$origin-y: $dot-height * .5 + $r;

.dot-hourglass {
  position: relative;
  top: -$r;

  @include dot(
    $width: 12px,
    $height: 12px,
    $radius: 6px,
    $bg-color: $dot-color-hsl,
    $color: transparent
  );

  margin: -1px 0;
  filter: blur(2px);
  transform-origin: $origin-x $origin-y;
  animation: dot-hourglass 2.4s infinite ease-in-out;
  animation-delay: .6s;

  &::before,
  &::after {
    content: '';
    display: inline-block;
    position: absolute;
    top: 0;
    left: 0;

    @include dot(
      $width: 12px,
      $height: 12px,
      $radius: 6px,
      $bg-color: $dot-color-hsl,
      $color: transparent
    );

    filter: blur(2px);
  }

  &::before {
    top: $r + $r;
  }

  &::after {
    animation: dot-hourglass-after 2.4s infinite cubic-bezier(.65, .05, .36, 1);
  }
}

@keyframes dot-hourglass {
  0% {
    transform: rotateZ(0deg);
  }

  25% {
    transform: rotateZ(180deg);
  }

  50% {
    transform: rotateZ(180deg);
  }

  75% {
    transform: rotateZ(360deg);
  }

  100% {
    transform: rotateZ(360deg);
  }
}

@keyframes dot-hourglass-after {
  0% {
    transform: translateY(0);
  }

  25% {
    transform: translateY($r * 2);
  }

  50% {
    transform: translateY($r * 2);
  }

  75% {
    transform: translateY(0);
  }

  100% {
    transform: translateY(0);
  }
}