css - 制作 :first-child ignore nested structure?

Question

http://jsfiddle.net/RKwHk/我需要如何更改我的选择器以便它只选择第一段？谢谢

<div class="cont">
    <span>
        <p>first</p>
    </span>
     <span>
        <p>second</p>
    </span>
     <span>
        <p>thrid</p>
    </span>
</div>

.cont p {
    color: green;
}
.cont p:first-child {
    color: red;
}

Answer 1

这样使用:

.cont p {
    color: green;
}
.cont span:first-child p {
    color: red;
}