.position-center(@direction) {
  position: absolute;
  & when(@direction = x) {
    left: 50%;
    transform: translateX(-50%);
  }
  & when(@direction = y) {
    top: 50%;
    transform: translateY(-50%);
  }
}

.swiper-arrow(@direction, @size: medium) {
  @arrowWidth: 'swiper-arrow-width-@{size}';
  @arrowHeight: 'swiper-arrow-height-@{size}';
  @arrowPosition: 'swiper-arrow-left-@{size}';
  & when(@size = medium) {
    .@{prefix}-swiper__arrow-@{direction} {
      .position-center(y);

      display: flex;
      width: @@arrowWidth;
      height: @@arrowHeight;
      justify-content: center;
      align-items: center;
      z-index: @swiper-navigation-z-index-default;
      background-color: transparent;
      color: @swiper-navigation-item-bg-hover;
      transition: @anim-duration-base linear;
      cursor: pointer;
      & when(@direction = left) {
        left: @@arrowPosition;
      }
      & when(@direction = right) {
        right: @@arrowPosition;
      }

      &:hover {
        color: @swiper-navigation-item-bg-active;
        background-color: @swiper-navigation-item-bg;
        border-radius: @border-radius-default;
        transition: @anim-duration-base linear;
      }

      &:active {
        background-color: @swiper-arrow-active;
        transition: @anim-duration-base linear;
      }
    }
  }
  & when(@size = large) {
    .@{prefix}-swiper__arrow-@{direction} {
      width: @@arrowWidth;
      height: @@arrowHeight;
      & when(@direction = left) {
        left: @@arrowPosition;
      }
      & when(@direction = right) {
        right: @@arrowPosition;
      }
    }
  }
  & when(@size = small) {
    .@{prefix}-swiper__arrow-@{direction} {
      width: @@arrowWidth;
      height: @@arrowHeight;
      & when(@direction = left) {
        left: @@arrowPosition;
      }
      & when(@direction = right) {
        right: @@arrowPosition;
      }
    }
  }
}

.swiper-arrow-fraction(@direction, @width) {
  .@{prefix}-swiper__arrow-@{direction} {
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: @swiper-navigation-z-index-default;
    background-color: transparent;
    color: @swiper-navigation-arrow-color-fraction;
    width: @@width;
    height: @@width;
    cursor: pointer;

    &:hover {
      color: @swiper-navigation-item-outside-bg-hover;
    }

    &:active {
      color: @swiper-navigation-item-outside-bg-active;
    }
  }
}

.swiper-navigation-fraction(@size: medium) {
  @fractionLineHeight: 'swiper-navigation-line-height-fraction-@{size}';
  @fractionFontSize: 'swiper-navigation-font-size-fraction-@{size}';
  .position-center(x);

  top: auto;
  right: auto;
  bottom: calc(0px - calc(@@fractionLineHeight + 12px));
  height: @@fractionLineHeight;
  line-height: @@fractionLineHeight;

  .swiper-arrow-fraction(left, @fractionLineHeight);
  .swiper-arrow-fraction(right, @fractionLineHeight);

  .@{prefix}-swiper__navigation-text-fraction {
    display: inline-block;
    font-size: @@fractionFontSize;
    color: @swiper-navigation-text-color-fraction;
    margin: 0;
  }
}

.swiper-navigation-item(@type, @position: inside, @direction: horizontal, @size: medium) {
  & when(@position = inside) {
    & when(@type = bars), (@type = dots-bar) {
      .@{prefix}-swiper__navigation-item {
        @itemWidth: 'swiper-navigation-item-width-bars-@{size}';
        @itemHeight: 'swiper-navigation-item-height-bars-@{size}';
        @itemWidthActive: 'swiper-navigation-item-width-bars-@{size}-active';
        @itemMargin: 'swiper-navigation-item-margin-@{size}';

        cursor: pointer;
        & when(@type = dots-bar) {
          span {
            border-radius: calc(@@itemHeight / 2);
          }
        }
        & when(@direction = horizontal) {
          margin: 0 0 0 @@itemMargin;
          padding: @@itemMargin * 3 0;
          width: @@itemWidth;
          height: auto;

          span {
            width: 100%;
            height: @@itemHeight;
          }

          &:nth-child(1) {
            margin-left: 0;
          }
        }
        & when(@direction = vertical) {
          margin: @@itemMargin 0 0 0;
          padding: 0 @@itemMargin * 3;
          width: auto;
          height: @@itemWidth;

          span {
            width: @@itemHeight;
            height: 100%;
          }

          &:nth-child(1) {
            margin-top: 0;
          }
        }

        span {
          background: @swiper-navigation-item-bg;

          &:hover {
            background-color: @swiper-navigation-item-bg-hover;
          }

          &:active {
            background-color: @swiper-navigation-item-bg-active;
          }
        }

        &.@{prefix}-is-active {
          & when(@direction = horizontal) {
            width: @@itemWidthActive;
          }
          & when(@direction = vertical) {
            height: @@itemWidthActive;
          }

          span {
            background-color: @swiper-navigation-item-bg-active;
          }
        }
      }
    }
    & when(@type = dots) {
      .@{prefix}-swiper__navigation-item {
        @itemWidth: 'swiper-navigation-item-dot-size--@{size}';
        @itemHeight: 'swiper-navigation-item-dot-size--@{size}';
        @itemWidthActive: 'swiper-navigation-item-width-bars-@{size}-active';
        @itemMargin: 'swiper-navigation-item-margin-@{size}';

        cursor: pointer;

        span {
          border-radius: 50%;
        }
        & when(@direction = horizontal) {
          margin: 0 0 0 @@itemMargin;
          padding: @@itemMargin * 3 0;
          width: @@itemWidth;
          height: auto;

          span {
            width: 100%;
            height: @@itemHeight;
          }

          &:nth-child(1) {
            margin-left: 0;
          }
        }
        & when(@direction = vertical) {
          margin: @@itemMargin 0 0 0;
          padding: 0 @@itemMargin * 3;
          width: auto;
          max-height: @@itemWidth;

          span {
            width: @@itemHeight;
            height: 100%;
          }

          &:nth-child(1) {
            margin-top: 0;
          }
        }

        span {
          background: @swiper-navigation-item-bg;

          &:hover {
            background-color: @swiper-navigation-item-bg-hover;
          }

          &:active {
            background-color: @swiper-navigation-item-bg-active;
          }
        }

        &.@{prefix}-is-active {
          span {
            background-color: @swiper-navigation-item-bg-active;
          }
        }
      }
    }
  }

  & when(@position = outside) {
    & when(@type = bars), (@type = dots-bar), (@type = dots) {
      .@{prefix}-swiper__navigation-item {
        span {
          background-color: @swiper-navigation-item-bg-outside;

          &:hover {
            background-color: @swiper-navigation-item-outside-bg-hover;
          }

          &:active {
            background-color: @swiper-navigation-item-outside-bg-active;
          }
        }
      }
      .@{prefix}-is-active {
        span {
          background-color: @swiper-navigation-item-outside-bg-active;
        }
      }
    }
  }
}