<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css">
<h1>Pure CSS - Accordion With Input Edit</h1>
<ul class="treeview checklist">
  <li>
    <input type="checkbox" name="tall" id="tall">
    <label for="tall">
      <div class="ball" data-id="1"></div>
      <input type="text" value="Input value">
      <div class="action-list">
        <i class="fa fa-trash"></i>
        <i class="fa fa-plus"></i>
      </div>
    </label>
    <ul>
      <li>
        <input type="checkbox" name="tall-1" id="tall-1">
        <label for="tall-1">
          <div class="ball" data-id="2"></div>
          <input type="text" value="Text input 1">
          <div class="action-list">
            <i class="fa fa-trash"></i>
            <i class="fa fa-plus"></i>
          </div>
        </label>
        <ul>
          <li>
            <label>
              <div class="ball" data-id="3"></div>
              <input type="text" value="Text input 2">
            </label>
          </li>
        </ul>
      </li>
    </ul>
  </li>
</ul>

*,
*:before,
*:after {
  box-sizing: border-box;
  outline: none;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
/*Title Default*/
body {
  background: #343436;
  color: #777;
  font-family: arial;
}
h1 {
  margin: 1em 0;
  text-align: center;
  border-bottom: 1px dashed;
  padding-bottom: 1em;
  font-weight: lighter;
}

/*Treeview ***********************************************/
.treeview input[type=checkbox]{
  display:none
}


.treeview,
.treeview ul{
  padding: 0;
  margin: 0;
  overflow: hidden;
}

.treeview li{
  padding-left: 27px;
  position: relative;
  font-size: 1rem;
  margin-top: 4px;
  display: flex;
  flex-direction: column
}
.treeview > li{
  padding-left: 0;
}

.treeview ul{
  max-height: 0;
  -webkit-transition: .8s ease;
  -moz-transition: .8s ease;
  -ms-transition: .8s ease;
  -o-transition: .8s ease;
}

.treeview li input:nth-of-type(1):checked ~ ul{
  max-height: 1000px;
}

.treeview li label{
  padding: 16px;
  padding-left: 78px;
  background-color: #f3f3f4;
  cursor: pointer;
  border-radius: 100px;
  height: 65px;
  font-size: 13px;
  display: flex;
  align-items: center;
}
.treeview li label i{
  font-size: 14px
}
.treeview li label > span{
  margin: 0 20px
}
.treeview li label input[type=text]{
  flex: 1;
  color: #676A6C;
  background: white;
  border: none;
  border-radius: 3px;
  transition: .2s ease;
  padding: 9px;
  margin-left: 10px;
  background: none
}
.treeview li label input[type=text]:focus,
.treeview li label input[type=text]:hover{
  background: white
}

.treeview li label:not(.child):before{
  transition: .3s ease;
  position: absolute;
  margin-left: -16px;
}
.treeview li label:not(.child):before{
  font: normal normal normal 14px/1 FontAwesome;
  content: "\f054";
}

.treeview li input[type=checkbox]:checked + label:before{
  transform: rotate(90deg);
}
.treeview .ball{
  left: 16px;
  margin-left: -60px;
  padding-right: 30px;
}
.treeview .ball:before{
  color: #fff;
  position: relative;
  display: flex;
  border-radius: 50%;
  background-color: #23c6c8;
  align-items: center;
  height: 23px;
  width: 23px;
  font-size: 13px;
  justify-content: center;
  content: attr(data-id);
}
.treeview .action-list{
  margin-left: auto
}
.treeview .action-list i{
  margin-left: 15px
}