You are doing the :hover wrong.
Also, to get different results for :link and :visited, you need to have them separate and give them different colors.
Code:
A.category-top {
    color: #2C3333;
    text-decoration: none;
    }

A.category-top:visited {
    color: #2C33ff;
    }

A.category-top:hover {
    color: #0000CC;
    }