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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

tree {
  display: block;
  font-family: serif;
}

tree-node {
  display: block;
  border-left: 1px solid #777;
  position: relative;
}

tree > tree-node {
  border-left: 0px;
}

tree-node:last-child:after {
  border-left: 1px solid white;
  display: block;
  height: 50%;
  position: absolute;
  left: -1px;
  top: 50%;
  content: '';
}

tree-node:before {
  position: absolute;
  display: block;
  top: 50%;
  height: 1px;
  width: 10px;
  background-color: #777;
  content: '';
}

tree > tree-node:before {
  display: none;
}

tree-face {
  display: flex;
  justify-content: space-between;
  padding: 2px 0 2px 4px;
}

tree-children tree-face {
  padding: 2px 0 2px 8px;
}

tree-node-open-close {
  display: block;
  flex-shrink: 0;
  align-self: center;

  background: gray;
  color: white;
  width: 16px;
  height: 16px;
  border-radius: 16px;
  line-height: 16px;
  text-align: center;
}

tree-node-open-close:before {
  content: "+";
}

tree-node[expanded=true] > tree-face > tree-node-open-close:before {
  content: "";
  display: block;
  width: 8px;
  height: 1px;
  margin: 8px 0 0 4px;
  background-color: white;
}

tree-node[expanded=false] > tree-children {
  display: none;
}

tree-label {
  display: block;
  width: 100%;
  margin-left: 4px;
  cursor: pointer;
  word-break: break-all;
}

tree-label:hover {
  color: #888;
}

tree-node.active > tree-face > tree-label {
  background-color: #ccc;
}

tree-children {
  margin-left: 10px;
  display: block;
}