ボタン13

$BLOCK_NAME: '.button-13';

// 変数
$color_primary: #000;
$color_secondary: #fdcf10;
$transition_bg: 0.3s;
$transition_border: 0.3s;
$transition_arrow: 1.5s;
$easing_default: cubic-bezier(0.45, 0.05, 0.3, 0.93);
$delay_arrow: 1s;
$arrowAnimOption: $transition_arrow $easing_default $delay_arrow infinite;

#{ $BLOCK_NAME } {
  position: relative;
  display: inline-flex;
  align-items: center;
  height: 45px;
  padding: 0 78px 0 36px;
  font-family: 'Josefin Sans', sans-serif;
  font-size: 12px;
  font-weight: 600;
  border: 1px solid $color_primary;
  transition: border-color $transition_border $easing_default;
  &::before {
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    z-index: -1;
    display: block;
    content: '';
    background: $color_secondary;
    transition: transform $transition_bg $easing_default;
    transform: scaleX(0);
    transform-origin: right;
  }
  &:hover {
    border-color: $color_secondary;
    &::before {
      transform: scaleX(1);
      transform-origin: left;
    }
  }
  &__arrow {
    position: absolute;
    top: 0;
    right: 16px;
    bottom: 0;
    display: block;
    width: 48px;
    margin: auto 0;
    &::before,
    &::after {
      position: absolute;
      top: 0;
      bottom: 0;
      display: block;
      margin: auto 0;
      content: '';
      background: $color_primary;
    }
    &::before {
      right: 0;
      width: 8px;
      height: 8px;
      border-radius: 50%;
      animation: button13ArrowDot $arrowAnimOption;
    }
    &::after {
      right: 4px;
      left: 0;
      height: 1px;
      animation: button13ArrowLine $arrowAnimOption;
    }
  }
}

@keyframes button13ArrowDot {
  0% {
    opacity: 1;
    transform: scale(0);
  }
  30% {
    opacity: 1;
    transform: scale(0);
  }
  60% {
    opacity: 1;
    transform: scale(1);
  }
  100% {
    opacity: 0;
    transform: scale(1);
  }
}

@keyframes button13ArrowLine {
  0% {
    transform: scaleX(0);
    transform-origin: left center;
  }
  30% {
    transform: scaleX(1);
    transform-origin: left center;
  }
  31% {
    transform: scaleX(1);
    transform-origin: right center;
  }
  60% {
    transform: scaleX(0);
    transform-origin: right center;
  }
  100% {
    transform: scaleX(0);
    transform-origin: right center;
  }
}