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HTML 

              
                <div id="mobilemenu" class="ui styled accordion">
  <div class="title">
    <i class="paint brush icon"></i>
    Diseño web
    <i class="dropdown icon"></i>
  </div>
  <div class="content">
    <div class="accordion">
      <div class="title">
          <i class="cloud upload icon"></i>
          Level 1Asa
          <i class="dropdown icon"></i>
      </div>
      <div class="content">
        <div class="accordion">
          <div class="item">
              <i class="tags icon"></i>
              Level 1A-A
          </div>
          <div class="item">
              <i class="shield alternate icon"></i>
              Level 1A-A
          </div>
        </div>
      </div>
      <div class="item">
          <i class="headphones icon"></i>
          Level 1B
      </div>
      <div class="item">
          <i class="chart line icon"></i>
          Level 1C
      </div>
    </div>
  </div>
  <div class="item">
    <i class="code icon"></i>
    Desarrollo front-end
  </div>
  <div class="title">
    <i class="mobile alternate icon"></i>
    Diseño responsive
    <i class="dropdown icon"></i>
  </div>
  <div class="content">
    <div class="accordion">
      <div class="title">
        <i class="dropdown icon"></i>
        Level 2A
      </div>
      <div class="content">
        <div class="accordion">
          <div class="item">
              Level 2A-A
          </div>
          <div class="item">
              Level 2A-A
          </div>
        </div>
      </div>
      <div class="item">
          Level 2B
      </div>
      <div class="item">
          Level 2C
      </div>
    </div>
  </div>
  <div class="item">
    <i class="globe icon"></i>
    Posicionamiento web.
  </div>
</div>
!

CSS 

              
                body {
  margin: 20px;
}
#mobilemenu .item {
  margin: 0;
  padding: .75em 1em;
  color: rgba(0,0,0,.4);
  font-weight: 700;
  border-top: 1px solid rgba(34,36,38,.15);
  -webkit-transition: background .1s ease,color .1s ease;
  transition: background .1s ease,color .1s ease;
  cursor: pointer;
}
#mobilemenu .title, #mobilemenu .item {
  color: #2E2C42;
  font-weight: 700;
  font-size: 14px;
}
#mobilemenu .active.title, #mobilemenu .item:active {
  color: #AD6898;
}
#mobilemenu .icon:not(.dropdown)  {
  margin-left: 2px;
  margin-right: 8px;
}
#mobilemenu .dropdown.icon {
  float: right;
}
#mobilemenu > .content {
  padding: 0px;
}
#mobilemenu > .content > .accordion{
  margin: 0px;
}
#mobilemenu > .content > .accordion > div{
  background: #454359;
  color: #FFFFFF;
  padding-left: 30px;
  border-top: 1px solid #58566e;
  font-weight: 500;
}
#mobilemenu .title .dropdown.icon {
  font-size: 18px;
  margin-top: 0px; 
}
#mobilemenu .title .dropdown.icon::before {
  content: '\f107';
  font-family: Icons;
}
#mobilemenu .active.title .dropdown.icon {
  -webkit-transform: rotate(-180deg);
  transform: rotate(-180deg);
  margin-top: 3px;
}

#mobilemenu > .content > .accordion > .content {
  padding: 0px;
}
#mobilemenu > .content > .accordion > .content > .accordion{
  margin: 0px;
}
#mobilemenu > .content > .accordion > .content > .accordion > .item{
  background: #312F45;
  color: #FFFFFF;
  padding-left: 50px;
  font-weight: 500;
  border-top: 1px solid #45425C;
}
!

JS 

              
                $('#mobilemenu').accordion()

$('#mobilemenu .item').click(() => {
  
})
!
999px

Console