Keyboard nav in linked lists

Only tabbing :(

by agib

HTML

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css">
<h2>
Navigation with <em>only</em> tabbing
</h2>
<div class="form-group">
  <input type="search" name="" id="" class="form-control" placeholder="Search here...">
</div>
<div class="form-group">
  <div class="list-group">
    <a href="#" class="list-group-item">
      Cras justo odio
    </a>
    <a href="#" class="list-group-item">Dapibus ac facilisis in Lorem ipsum dolor sit amet, consectetur adipisicing elit. Harum quasi, incidunt maxime commodi ut fugiat aliquam facere repellat, nisi obcaecati voluptatibus. Iusto, necessitatibus, inventore! Laborum eum explicabo quas vero perferendis!</a>
    <a href="#" class="list-group-item">Morbi leo risus</a>
    <a href="#" class="list-group-item">Porta ac consectetur ac</a>
    <a href="#" class="list-group-item">Vestibulum at eros</a>
  </div>
</div>
<br>
<h2>
Navigation with tabbing <em>then</em> arrow down/up (using hidden radio buttons)
</h2>
<div class="form-group">
  <input type="search" name="" id="" class="form-control" placeholder="Search here...">
</div>
<div class="form-group">
  <fieldset class="list-group">
    <label class="list-group-item">
      <input type="radio" name="itemGroup">
        <div class="tabular">
          Cras justo odio
        </div>
    </label>
    <label class="list-group-item">
      <input type="radio" name="itemGroup">
      <div class="tabular">
        Dapibus ac facilisis in Lorem ipsum dolor sit amet, consectetur adipisicing elit. Harum quasi, incidunt maxime commodi ut fugiat aliquam facere repellat, nisi obcaecati voluptatibus. Iusto, necessitatibus, inventore! Laborum eum explicabo quas vero perferendis!
      </div>
    </label>
    <label class="list-group-item">
      <input type="radio" name="itemGroup">
        <div class="tabular">
          Morbi leo risus
        </div>
    </label>
    <label class="list-group-item">
      <input type="radio" name="itemGroup">
    ...

SCSS

// General
body {
  padding: 4rem;
}
// Navigation with <em>only</em> tabbing

.list-group-item:focus {
  outline: 2px solid dodgerblue;
  background-color: dodgerblue !important;
  color: white !important;
}

// Navigation with tabbing <em>then</em> arrow down/up (using hidden radio buttons)
label {
  font-weight: normal;
}
label.list-group-item {
  padding: 0;
  .tabular {
    padding: 10px 15px;
  }
}
[name="itemGroup"]{
  border: 0; 
  clip: rect(0 0 0 0); 
  height: 1px; margin: -1px; 
  overflow: hidden; 
  padding: 0; 
  position: absolute; 
  width: 1px;
  &:checked,
  &:focus {
    + .tabular {
      background-color: dodgerblue;
      color: white;
    }
  }
}