有什么方法可以将css3限制nth-of-type为一个类吗？我有动态的section元素数量，其中有不同的类来指定其布局需求。我想抓住每3rd.module，但似乎nth-of-type查找类元素类型，然后计算类型。相反，我想将其限制为仅.modules。

谢谢！

HTML：

<section class="featured video">
    <h1>VIDEO</h1>
</section>
<section class="featured module">
    <h1>NOT A VIDEO</h1>
</section>
<section class="featured module">
    <h1>NOT A VIDEO</h1>
</section>
<section class="featured module">
    <h1>NOT A VIDEO (3)</h1>
</section>
<section class="featured module">
    <h1>NOT A VIDEO</h1>
</section>
<section class="featured module">
    <h1>NOT A VIDEO</h1>
</section>
<section class="featured module">
    <h1>NOT A VIDEO (6)</h1>
</section>

CSS：

.featured {
  width:31%;
  margin:0 0 20px 0;
  padding:0 3.5% 2em 0;
  float:left;
  background:#ccc;
}
  .featured.module:nth-of-type(3n+3) {
    padding-right:0;
    background:red;
  }
  .featured.video {
    width:auto;
    padding:0 0 2em 0;
    float:none;
  }​