Как сделать, чтобы только после нажатия по «Item1,2» появились «CItem 1,2»?

<html>
<head>
</head>
<body>
 <div class="Nn" >
  <div class="col">
    <div class="tabs">
      <div class="tab">
        <input type="radio" id="rd1" name="rd">
        <label class="tab-label" for="rd1">Item 1</label>
        <div class="tab-content">





<div class="row" >
  <div class="col">

    <div class="tabs">
      <div class="tab">

        <input type="checkbox" id="chck1" >
        <label class="tab-label" for="chck1" class="chck1q"   >Citem 1</label>

        <div class="tab-content">
     1
        </div>
      </div>
      <div class="tab">
        <input type="checkbox" id="chck2"  >
        <label class="tab-label" for="chck2" >CItem2</label>
        <div class="tab-content">
2
        </div>
      </div>
    </div>
  </div>
  





        </div>
      </div>
      <div class="tab">
        <input type="radio" id="rd2" name="rd">
        <label class="tab-label" for="rd2">Item 2</label>
        <div class="tab-content">

        </div>
      </div>
      <div class="tab">
        <input type="radio" id="rd3" name="rd">
        <label for="rd3" class="tab-close">Close others &times;</label>
      </div>
    </div>
  </div>
</div>
</div>
<style type="text/css">

body {
  color: #2c3e50;
  background: #ecf0f1;
  padding: 0 1em 1em;
}

h1 {
  margin: 0;
  line-height: 2;
  text-align: center;
}

h2 {
  margin: 0 0 .5em;
  font-weight: normal;
}

input {
  position: absolute;
  opacity:0;
  z-index: -1;
}

.row{
 z-index:3;
  display: -webkit-box;
  display: flex;
}


.row .col {
  -webkit-box-flex: 1;
          flex: 1;
}
.row .col:last-child {
  margin-left: 1em;
}

/* Accordion styles */
.tabs {

  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 4px 4px -2px rgba(0, 0, 0, 0.5);
}

.tab {
  width: 100%;
  color: white;
  overflow: hidden;
}
.tab-label {
  display: -webkit-box;
  display: flex;
  -webkit-box-pack: justify;
          justify-content: space-between;
  padding: 1em;
  background: #2c3e50;
  font-weight: bold;
  cursor: pointer;
  /* Icon */
}
.tab-label:hover {
  background: #1a252f;
}
.tab-label::after {
  content: "\276F";
  width: 1em;
  height: 1em;
  text-align: center;
  -webkit-transition: all .35s;
  transition: all .35s;
}
.tab-content {
  max-height: 0;
  padding: 0 1em;
  color: #2c3e50;
  background: white;
  -webkit-transition: all .35s;
  transition: all .35s;
}
.tab-close {
  display: -webkit-box;
  display: flex;
  -webkit-box-pack: end;
          justify-content: flex-end;
  padding: 1em;
  font-size: 0.75em;
  background: #2c3e50;
  cursor: pointer;
}
.tab-close:hover {
  background: #1a252f;
}

input:checked + .tab-label {
  background: #1a252f;
}
input:checked + .tab-label::after {
  -webkit-transform: rotate(90deg);
          transform: rotate(90deg);
}
input:checked ~ .tab-content {
  max-height: 100vh;
  padding: 1em;
  
  
}</style>
</body>
</html>