Wizard navigation in CSS (using Twitter Bootstrap)

wizard.html

<ol class="wizard-nav">
  <li class="done"><a href="#">Step 1</a></li>
  <li class="done"><a href="#">Step 2</a></li>
  <li class="active"><a href="#">Step 3</a></li>
  <li><a href="#" data-disabled>Step 4</a></li>
  <li><a href="#" data-disabled>Step 5</a></li>
</ol>

wizard.scss

@mixin wizard-step($bgColor, $shadowTone) {
  color: $white;
  text-shadow: 0 1px 0 darken($bgColor, $shadowTone);
  background: $bgColor;

  &:before {
    border-top-color: $bgColor;
    border-bottom-color: $bgColor;
  }

  &:after {
    border-left-color: $bgColor;
  }
}

@mixin wizard-step-group($bgColor) {
  a {
    @include wizard-step($bgColor, 15%);
  }

  &:hover a {
    @include wizard-step(darken($bgColor, 20%), 20%);
  }
}

.wizard-nav {
  position: relative;
  list-style-type: none;

  li {
    position: relative;
    float: left;
  }

  a {
    position: relative;
    display: inline-block;
    height: 2 * $baseLineHeight;
    line-height: 2 * $baseLineHeight;
    margin-right: $baseLineHeight;
    padding: 0px 10px;
    color: lighten($grayDark, 45%);
    background: #eee;
    text-decoration: none;
    font-weight: bold;

    &:before, &:after {
      width: 0;
      height: 0;
      position: absolute;
      content: "";
      top: 0;
      border: $baseLineHeight solid #eee;
      border-right-width: 0;
    }

    &:before {
      border-left: $baseLineHeight / 2 solid transparent;
      left: -$baseLineHeight / 2;
    }

    &:after {
      border-color: transparent;
      border-left: $baseLineHeight / 2 solid #eee;
      right: -$baseLineHeight / 2;
    }
  }

  .done   { @include wizard-step-group($btnInfoBackground) }
  .active { @include wizard-step-group($btnPrimaryBackground) }
}