ボタン31

$BLOCK_NAME: '.button-31';

// 変数
$color_primary: #333;
$color_gray: #efefef;
$color_white: #fff;
$duration_default: 0.3s;
$easing_default: cubic-bezier(0.215, 0.61, 0.355, 1);

#{ $BLOCK_NAME } {
  position: relative;
  z-index: 1;
  display: inline-block;
  padding: 10px 0 7px;
  font-size: 12px;
  font-weight: bold;
  line-height: 1;
  color: $color_primary;
  border-radius: 9999px;

  &::before {
    position: absolute;
    top: 0;
    left: -15px;
    z-index: 0;
    display: block;
    width: 30px;
    height: 30px;
    content: '';
    background-color: $color_gray;
    border-radius: 9999px;
    transition: all $duration_default $easing_default;
  }

  & > span {
    position: relative;
    z-index: 1;
    padding-bottom: 3px;
    line-height: 1;
    background-image: linear-gradient(180deg, #bfbfbf, #bfbfbf);
    background-repeat: no-repeat;
    background-position: 0 100%;
    background-size: 100% 1px;
  }

  &:hover {
    color: $color_white;

    &::before {
      width: calc(100% + 30px);
      background-color: $color_primary;
      box-shadow: 0 5px 13px rgba(0, 0, 0, 0.15);
    }
  }
}