.popup-arrow-top-left(@popup-border-color: @popup-arrow-color) when (@popup-arrow-height > 0) {
  content: "";
  width: 0;
  height: 0;
  position: absolute;
  z-index: @popup-arrow-zindex;
  top: -@popup-arrow-height - @popup-distance - @popup-border-width;
  left: -@popup-offset;
  border-left: @popup-arrow-width + @popup-border-width solid transparent;
  border-right: @popup-arrow-width + @popup-border-width solid transparent;
  border-top: @popup-arrow-height + @popup-border-width solid @popup-border-color;
  border-bottom: 0;
  margin-left: @popup-arrow-offset;
}

.popup-arrow-top-right(@popup-border-color: @popup-arrow-color) when (@popup-arrow-height > 0) {
  content: "";
  width: 0;
  height: 0;
  position: absolute;
  z-index: @popup-arrow-zindex;
  top: -@popup-arrow-height - @popup-distance - @popup-border-width;
  right: -@popup-offset;
  left: auto;
  border-left: @popup-arrow-width + @popup-border-width solid transparent;
  border-right: @popup-arrow-width + @popup-border-width solid transparent;
  border-top: @popup-arrow-height + @popup-border-width solid @popup-border-color;
  border-bottom: 0;
  margin-right: @popup-arrow-offset;
}

.popup-arrow-left(@popup-border-color: @popup-arrow-color) when (@popup-arrow-height > 0) {
  content: "";
  width: 0;
  height: 0;
  position: absolute;
  z-index: @popup-arrow-zindex;
  left: -@popup-arrow-height + @popup-border-width;
  top: 50%;
  bottom: auto;
  border-left: @popup-arrow-width + @popup-border-width solid transparent;
  border-right: @popup-arrow-height + @popup-border-width solid @popup-border-color;
  border-top: @popup-arrow-width + @popup-border-width solid transparent;
  border-bottom: 0;
  margin-top: @popup-arrow-offset;
}

.popup-arrow-right-middle(@popup-border-color: @popup-arrow-color) when (@popup-arrow-height > 0) {
  content: "";
  width: 0;
  height: 0;
  position: absolute;
  z-index: @popup-arrow-zindex;
  top: 50%;
  bottom: auto;
  margin: -@popup-arrow-height - @popup-border-width 0 0 0;
  border-bottom: @popup-arrow-width + @popup-border-width solid transparent;
  border-right: @popup-arrow-height + @popup-border-width solid @popup-border-color;
  border-top: @popup-arrow-width + @popup-border-width solid transparent;
  border-left: 0;
}

.popup-arrow-left-middle(@popup-border-color: @popup-arrow-color) when (@popup-arrow-height > 0) {
  content: "";
  width: 0;
  height: 0;
  position: absolute;
  z-index: @popup-arrow-zindex;
  top: 50%;
  bottom: auto;
  margin: -@popup-arrow-height - @popup-border-width 0 0 0;
  border-bottom: @popup-arrow-width + @popup-border-width solid transparent;
  border-left: @popup-arrow-height + @popup-border-width solid @popup-border-color;
  border-top: @popup-arrow-width + @popup-border-width solid transparent;
  border-right: 0;
}

.popup-arrow-bottom-left(@popup-border-color: @popup-arrow-color) when (@popup-arrow-height > 0) {
  content: "";
  width: 0;
  height: 0;
  position: absolute;
  z-index: @popup-arrow-zindex;
  bottom: -@popup-arrow-height - @popup-distance - @popup-border-width;
  top: auto;
  left: -@popup-offset;
  border-top: 0;
  border-left: @popup-arrow-width + @popup-border-width solid transparent;
  border-right: @popup-arrow-width + @popup-border-width solid transparent;
  border-bottom: @popup-arrow-height + @popup-border-width solid @popup-border-color;
  margin-left: @popup-arrow-offset;
}

.popup-arrow-bottom-right(@popup-border-color: @popup-arrow-color) when (@popup-arrow-height > 0) {
  content: "";
  width: 0;
  height: 0;
  position: absolute;
  z-index: @popup-arrow-zindex;
  bottom: -@popup-arrow-height - @popup-distance - @popup-border-width;
  top: auto;
  right: -@popup-offset;
  left: auto;
  border-top: 0;
  border-bottom: @popup-arrow-height + @popup-border-width solid @popup-border-color;
  margin-right: @popup-arrow-offset;
}

.popup-arrow-bottom-center(@popup-border-color: @popup-arrow-color) when (@popup-arrow-height > 0) {
  content: "";
  width: 0;
  height: 0;
  position: absolute;
  z-index: @popup-arrow-zindex;
  bottom: -@popup-arrow-height - @popup-distance - @popup-border-width;
  top: auto;
  left: 0;
  right: 0;
  margin-left: auto;
  margin-right: auto;
  border-left: @popup-arrow-width + @popup-border-width solid transparent;
  border-right: @popup-arrow-width + @popup-border-width solid transparent;
  border-top: 0;
  border-bottom: @popup-arrow-height + @popup-border-width solid @popup-border-color;
}

.popup-arrow-center(@popup-border-color: @popup-arrow-color) when (@popup-arrow-height > 0) {
  content: "";
  width: 0;
  height: 0;
  position: absolute;
  z-index: @popup-arrow-zindex;
  left: 0;
  right: 0;
  margin-left: auto;
  margin-right: auto;
  border-left: @popup-arrow-width + @popup-border-width solid transparent;
  border-right: @popup-arrow-width + @popup-border-width solid transparent;
  border-top: @popup-arrow-height + @popup-border-width solid @popup-border-color;
}

.popup-core() {
  background: @popup-background;
  padding: @popup-padding;
  color: @popup-text-color;
  width: @popup-width;
  max-width: @popup-max-width;
  min-width: @popup-min-width;
  & when (@popup-min-width = max-content) {
    min-width: -webkit-max-content;
    min-width: -moz-max-content;
  }
  & when (@popup-min-width = min-content) {
    min-width: -webkit-min-content;
    min-width: -moz-min-content;
  }
  & when (@popup-max-width = max-content) {
    max-width: -webkit-max-content;
    max-width: -moz-max-content;
  }
  & when (@popup-max-width = min-content) {
    max-width: -webkit-min-content;
    max-width: -moz-min-content;
  }
  & when (@popup-width = max-content) {
    width: -webkit-max-content;
    width: -moz-max-content;
  }
  & when (@popup-width = min-content) {
    width: -webkit-min-content;
    width: -moz-min-content;
  }
  border-radius: @popup-border-radius;
  & when (@popup-distance > 0) {
    bottom: calc(100% ~"+" @popup-distance);
  }
  & when (@popup-distance = 0) {
    bottom: 100%;
  }
  left: -@popup-offset;
  position: absolute;
  z-index: @popup-zindex;
  margin-bottom: @popup-arrow-height;
  border: @popup-border;
  box-shadow: @popup-shadow;
  & when (@popup-distance + @popup-arrow-height > 0) {
    &:before {
      content: "";
      position: absolute;
      background: none;
      border: 0 none !important;
    }
    &.@{popup-top}, &:not(.@{popup-bottom}), &.@{popup-top-right}, &.@{popup-center} {
      &:before {
        left: -@popup-offset;
        width: 100%;
        bottom: auto;
        top: 100%;
        height: calc(@popup-arrow-height ~"+" @popup-distance);
      }
    }
    &.@{popup-bottom}, &.@{popup-bottom-right}, &.@{popup-bottom-center} {
      &:before {
        left: -@popup-offset;
        width: 100%;
        top: auto;
        bottom: 100%;
        height: calc(@popup-arrow-height ~"+" @popup-distance);
      }
    }
    &.@{popup-right-top}, &.@{popup-right-middle}, &.@{popup-right-bottom} {
      &:before {
        left: -@popup-distance;
        right: auto;
        top: @popup-border-width;
        height: calc(100% ~"+" @popup-border-width);
        width: calc(@popup-arrow-height ~"+" @popup-distance ~"+" @popup-border-width);
      }
    }
    &.@{popup-left-top}, &.@{popup-left-middle}, &.@{popup-left-bottom} {
      &:before {
        right: -@popup-distance;
        left: auto;
        top: @popup-border-width;
        height: calc(100% ~"+" @popup-border-width);
        width: calc(@popup-arrow-height ~"+" @popup-distance ~"+" @popup-border-width);
      }
    }
  }
}

.@{popup} {
  .popup-core;
  &.@{popup-with-menu} {
    min-width: 100%;
    @{menu} {
      min-width: 100%;
    }
  }
  .@{popup-content} {
    .popup-content();
  }
  .@{popup-header} {
    .popup-header();
  }
  .@{popup-footer} {
    .popup-footer();
  }
  &.@{popup-top}, &:not(.@{popup-bottom}) {
    left: -@popup-offset;
    & when (@popup-arrow-height > 0) {
      &:after {
        .popup-arrow-top-left;
        left: 0;
        bottom: auto;
        top: 100%;
        margin-bottom: auto;
      }
    }
    & when (@popup-border-width > 0) {
      &:before {
        .popup-arrow-top-left(@popup-border-color);
        left: 0;
        bottom: auto;
        top: calc(100% ~"+" @popup-border-width);
        margin-bottom: auto;
      }
    }
  }
  &.@{popup-top-right} {
    left: auto;
    right: -@popup-offset;
    & when (@popup-arrow-height > 0) {
      &:after {
        .popup-arrow-top-right;
        bottom: auto;
        top: 100%;
        right: 0;
        margin-bottom: auto;
      }
    }
    & when (@popup-border-width > 0) {
      &:before {
        .popup-arrow-top-right(@popup-border-color);
        bottom: auto;
        top: calc(100% ~"+" @popup-border-width);
        right: 0;
        margin-bottom: auto;
      }
    }
  }
  &.@{popup-center} {
    left: 50%;
    transform: translate(-50%, 0);
    & when (@popup-arrow-height > 0) {
      &:after {
        .popup-arrow-center;
        bottom: auto;
        top: 100%;
        margin-bottom: auto;
      }
    }
    & when (@popup-border-width > 0) {
      &:before {
        .popup-arrow-center(@popup-border-color);
        bottom: auto;
        top: calc(100% ~"+" @popup-border-width);
        margin-bottom: auto;
      }
    }
  }
  &.@{popup-bottom} {
    bottom: auto;
    & when (@popup-distance > 0) {
      top: calc(100% ~"+" @popup-distance);
    }
    & when (@popup-distance = 0) {
      top: 100%;
    }
    margin-top: @popup-arrow-height;
    left: -@popup-offset;
    & when (@popup-arrow-height > 0) {
      &:after {
        .popup-arrow-bottom-left;
        top: auto;
        bottom: 100%;
        left: 0;
        margin-top: -@popup-arrow-height;
        margin-bottom: auto;
      }
    }
    & when (@popup-border-width > 0) {
      &:before {
        .popup-arrow-bottom-left(@popup-border-color);
        top: auto;
        & when (@popup-border-width > 0) {
          bottom: calc(100% ~"+" @popup-border-width);
        }
        & when (@popup-border-width = 0) {
          bottom: 100%;
        }
        left: 0;
        margin-top: -@popup-arrow-height;
        margin-bottom: auto;
      }
    }
  }
  &.@{popup-bottom-right} {
    bottom: auto;
    & when (@popup-distance > 0) {
      top: calc(100% ~"+" @popup-distance);
    }
    & when (@popup-distance = 0) {
      top: 100%;
    }
    right: -@popup-offset;
    left: auto;
    margin-top: @popup-arrow-height;
    & when (@popup-arrow-height > 0) {
      &:after {
        .popup-arrow-bottom-right;
        top: auto;
        bottom: 100%;
        right: 0;
        margin-top: -@popup-arrow-height;
        margin-bottom: auto;
      }
    }
    & when (@popup-border-width > 0) {
      &:before {
        .popup-arrow-bottom-right(@popup-border-color);
        top: auto;
        bottom: calc(100% ~"+" @popup-border-width);
        right: 0;
        margin-top: -@popup-arrow-height;
        margin-bottom: auto;
      }
    }
  }

  &.@{popup-bottom-center} {
    left: 50%;
    transform: translate(-50%, 0);
    bottom: auto;
    & when (@popup-distance > 0) {
      top: calc(100% ~"+" @popup-distance);
    }
    & when (@popup-distance = 0) {
      top: 100%;
    }
    margin-top: @popup-arrow-height;
    & when (@popup-arrow-height > 0) {
      &:after {
        .popup-arrow-bottom-center;
        top: auto;
        bottom: 100%;
        margin-top: -@popup-arrow-height;
        margin-bottom: auto;
      }
    }
    & when (@popup-border-width > 0) {
      &:before {
        .popup-arrow-bottom-center(@popup-border-color);
        top: auto;
        bottom: calc(100% ~"+" @popup-border-width);
        margin-top: -@popup-arrow-height;
        margin-bottom: auto;
      }
    }
  }
  &.@{popup-right-middle} {
    top: 50%;
    bottom: auto;
    & when (@popup-distance > 0) {
      left: calc(100% ~"+" @popup-distance);
    }
    & when (@popup-distance = 0) {
      left: 100%;
    }
    transform: translate(0, -50%);
    margin-left: @popup-arrow-height;
    & when (@popup-arrow-height > 0) {
      &:after {
        .popup-arrow-right-middle;
        margin-left: -@popup-arrow-height - @popup-border-width;
      }
    }
    & when (@popup-border-width > 0) {
      &:before {
        .popup-arrow-right-middle(@popup-border-color);
        margin-left: -@popup-arrow-height - 2 * @popup-border-width;
      }
    }
  }
  &.@{popup-left-middle} {
    top: 50%;
    bottom: auto;
    & when (@popup-distance > 0) {
      right: calc(100% ~"+" @popup-distance);
    }
    & when (@popup-distance = 0) {
      right: 100%;
    }
    left: auto;
    transform: translate(0, -50%);
    margin-right: @popup-arrow-height;
    & when (@popup-arrow-height > 0) {
      &:after {
        .popup-arrow-left-middle;
        right: 0;
        left: auto;
        margin-right: -@popup-arrow-height - @popup-border-width;
      }
    }
    & when (@popup-border-width > 0) {
      &:before {
        .popup-arrow-left-middle(@popup-border-color);
        right: 0;
        left: auto;
        margin-right: -@popup-arrow-height - 2 * @popup-border-width;
      }
    }
  }

  &.@{popup-right-top} {
    top: -@popup-offset - @popup-arrow-height/2;
    bottom: auto;
    & when (@popup-distance > 0) {
      left: calc(100% ~"+" @popup-distance);
    }
    & when (@popup-distance = 0) {
      left: 100%;
    }
    margin-left: @popup-arrow-height;
    & when (@popup-arrow-height > 0) {
      &:after {
        .popup-arrow-right-middle;
        bottom: auto;
        top: @popup-arrow-offset + @popup-arrow-height;
        margin-left: -@popup-arrow-height - @popup-border-width;
      }
    }
    & when (@popup-border-width > 0) {
      &:before {
        .popup-arrow-right-middle(@popup-border-color);
        bottom: auto;
        top: @popup-arrow-offset + @popup-arrow-height;
        margin-left: -@popup-arrow-height -  2 * @popup-border-width;
      }
    }
  }
  &.@{popup-right-bottom} {
    top: auto;
    bottom: -@popup-offset - @popup-arrow-height/2;
    & when (@popup-distance > 0) {
      left: calc(100% ~"+" @popup-distance);
    }
    & when (@popup-distance = 0) {
      left: 100%;
    }
    margin-left: @popup-arrow-height;
    margin-bottom: 0;
    & when (@popup-arrow-height > 0) {
      &:after {
        .popup-arrow-right-middle;
        bottom: @popup-arrow-offset;
        top: auto;
        margin-left: -@popup-arrow-height - @popup-border-width;
      }
    }
    & when (@popup-border-width > 0) {
      &:before {
        .popup-arrow-right-middle(@popup-border-color);
        bottom: @popup-arrow-offset;
        top: auto;
        margin-left: -@popup-arrow-height - 2 * @popup-border-width;
      }
    }
  }
  &.@{popup-left-top} {
    top: -@popup-offset - @popup-arrow-height/2;
    bottom: auto;
    & when (@popup-distance > 0) {
      right: calc(100% ~"+" @popup-distance);
    }
    & when (@popup-distance = 0) {
      right: 100%;
    }
    left: auto;
    margin-right: @popup-arrow-height;
    & when (@popup-arrow-height > 0) {
      &:after {
        .popup-arrow-left-middle;
        bottom: auto;
        right: 0;
        left: auto;
        top: @popup-arrow-offset + @popup-arrow-height;
        margin-right: -@popup-arrow-height - @popup-border-width;
      }
    }
    & when (@popup-border-width > 0) {
      &:before {
        .popup-arrow-left-middle(@popup-border-color);
        bottom: auto;
        right: 0;
        left: auto;
        top: @popup-arrow-offset + @popup-arrow-height;
        margin-right: -@popup-arrow-height - 2 * @popup-border-width;
      }
    }
  }
  &.@{popup-left-bottom} {
    top: auto;
    bottom: -@popup-offset - @popup-arrow-height/2;
    & when (@popup-distance > 0) {
      right: calc(100% ~"+" @popup-distance);
    }
    & when (@popup-distance = 0) {
      right: 100%;
    }
    left: auto;
    margin-right: @popup-arrow-height;
    margin-bottom: 0;
    & when (@popup-arrow-height > 0) {
      &:after {
        .popup-arrow-left-middle;
        bottom: @popup-arrow-offset;
        top: auto;
        right: 0;
        left: auto;
        margin-right: -@popup-arrow-height - @popup-border-width;
      }
    }
    & when (@popup-border-width > 0) {
      &:before {
        .popup-arrow-left-middle(@popup-border-color);
        bottom: @popup-arrow-offset;
        top: auto;
        right: 0;
        left: auto;
        margin-right: -@popup-arrow-height - 2 * @popup-border-width;
      }
    }
  }
}

.@{has-popup} {
  position: relative;
  display: inline-block;
  &.@{popup-absolute} {
    position: absolute;
  }
  &.@{popup-fixed} {
    position: fixed;
  }
  > .@{popup} {
    display: none;
  }
  &.@{popup-active} {
    .popup-active;
    > .@{popup} {
      .popup-active-on;
    }
  }

  &.@{popup-hoverable} {
    &:hover {
      .popup-active;
      > .@{popup} {
        .popup-active-on;
      }
    }
  }

  &[tabindex]:focus {
    .popup-active;
    > .@{popup} {
      .popup-active-on;
    }
  }

  &:not(.@{popup-manual}) {
    > input[type="checkbox"] {
      &:checked {
        position: fixed;
        z-index: (@popup-zindex - 1);
      }
    }
  }
  > input[type="checkbox"] {
    position: absolute;
    width: 100%;
    height: 100%;
    left: 0;
    right: 0;
    top: 0;
    bottom: 0;
    opacity: 0;
    margin: 0;
    &:checked {
      .popup-active;
      ~ .@{popup} {
        .popup-active-on;
      }
    }
  }
}