[jQuery] Superfish Plugin CSS problem

[jQuery] Superfish Plugin CSS problem


I have created a menu that when a selection is hovered over, its
background changes to a dark green, and the text becomes white. This
works fine, except when you hover over a selection in a deeper level
of the menu, the background of the parent li stays dark, but the text
returns to its original color, and is unreadable. I can't seem to get
this to work properly. Any suggestions? Thanks!
CSS of menu follows:
.nav, .nav * {
    margin:0;
    padding:0;
}
.nav {
    line-height:1.0;
    margin-bottom:1.5em;
    width: 150px;
    font-size: 0.9em;
}
.nav ul {
    background:#fff; /*IE6 needs this*/
    width: 150px;
}
.nav li {
    background:#c9dcc6;
    /*float: left;*/
    list-style:none;
    position:relative;
    width: 150px;
    z-index:999;
}
.nav a {
    color: #336633;
    text-align: left;
    font-weight: bold;
    display:block;
    padding: 5px 0 5px 10px;
    text-decoration:none;
    width: 140px;
}
.nav li ul {
    top:-999em;
    position:absolute;
    width:160px;
    border: 1px solid #aaa;
}
.nav li:hover,
.nav li.sfHover,
.nav a:focus, .nav a:hover, .nav a:active {
    background:#336633;
    color: #fff;
}
.nav li:hover ul, /* pure CSS hover is removed below */
ul.nav li.sfHover ul {
    left:150px;
    top:0px;
}
.nav li:hover li ul,
.nav li.sfHover li ul {
    top:-999em;
}
.nav li li:hover ul, /* pure CSS hover is removed below */
ul.nav li li.sfHover ul {
    left:150px;
    top:0px;
}
.nav li li:hover li ul,
.nav li li.sfHover li ul {
    top:-999em;
}
.nav li li li:hover ul, /* pure CSS hover is removed below */
ul.nav li li li.sfHover ul {
    left:150px;
    top:0px;
}
/*following rule negates pure CSS hovers
so submenu remains hidden and JS controls
when and how it appears*/
.superfish li:hover ul,
.superfish li li:hover ul,
.superfish li li li:hover ul {
    top: -999em;
}
.nav li li {
    background:#c9dcc6;
    width:160px;
}
.nav li li li {
    background:#c9dcc6;
}
.nav li li a {
    padding-right:0;
    width:150px;
}