.el-data-tree {
  position: relative;
  width: 100%;

  & .el-tree {
    background-color: transparent;
  }

  & .el-data-tree-main {
    transition: 0.3s;
  }

  &.is-collapsed {
    min-width: 20px;
    width: 20px;
    background-color: #ebeef5;
    cursor: pointer;

    & .collapse-icon {
      transform: rotate(180deg);
    }

    & .el-data-tree-main {
      // 折叠后隐藏所有树节点内容
      & .body {
        opacity: 0;
      }
    }
  }

  &:hover {
    & .collapse-icon-wrapper .collapse-icon {
      opacity: 1;
    }
  }

  & .collapse-icon-wrapper {
    @size: 26px;

    position: absolute;
    width: @size;
    height: @size;
    top: @size;
    right: 0 - (@size / 2);

    & .collapse-icon {
      transition: 0.3s;
      width: 100%;
      height: 100%;
      border-radius: 50%;
      box-shadow: 0 0 4px #999;
      background-color: #fff;
      opacity: 0;
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;

      & svg {
        width: 1rem;
        height: 1rem;
      }

      &:hover {
        & svg {
          opacity: 0.7;
        }
      }
    }
  }
}