To change the font color on the category menu open the module.css for the category menu and change the following css properties hightlighted in yellow:
/* Category Menu Styles */
.NodeStyle, a.NodeStyle, .NodeStyle:link, a.NodeStyle:link
{
width: 100%; /*width: 140px; */
font-size: 12px;
display: block;
text-decoration: none;
color: #CC0000;
border: solid 1px Transparent;
padding: 2px 2px 2px 2px;
}
.NodeStyle:hover, a.NodeStyle:hover, .NodeStyle:link:hover, a.NodeStyle:link:hover
{
width: 100%;
font-size: 12px;
display: block;
text-decoration: none;
color: #CC00FF;
border: 1px solid #999999;
background-color: #E8E8E8;
padding: 2px 2px 2px 2px;
}