.bpp-properties-group {
  padding: 6px 15px 6px 15px;
  position: relative;
  max-height: 2000px;
  overflow: hidden;
  transition: max-height 0.218s ease-in-out,
              padding-top 0.218s ease-in-out,
              padding-bottom 0.218s ease-in-out;

  &:empty {
    display: none;
  }

  > .group-toggle {
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    width: 4px;
    cursor: pointer;
    transition: background-color 0.218s linear;
    &:hover {
      background-color: @bpp-color-toggle;
    }
  }

  > .group-label {
    .label();
    font-size: 120%;
    margin-top: 5px;
    margin-bottom: 10px;
    transition: margin 0.218s linear;
    font-style: italic;
  }

  &:hover > .group-toggle {
    background-color: @bpp-color-gray-light;
    &:hover {
      background-color: @bpp-color-toggle;
    }
  }

  &.group-closed {
    max-height: 20px;
    border-top: none;
    cursor: pointer;
    background-color: fade(@bpp-color-toggle, 20%);
    padding-top: 0;
    padding-bottom: 0;

    > div {
      visibility: hidden;
    }

    > .group-label {
      margin-top: 2px;
      margin-bottom: 2px;
    }

    &:hover > .group-label {
      color: @bpp-color-primary;
    }
  }

  + .bpp-properties-group {
    border-top: 1px dotted @bpp-color-gray-light;
  }

  &:last-child {
    padding-bottom: 9px;
  }
}