Line 3087 in your css should show something like this –
.epik-darkblue .nav-primary .sub-menu a:hover,
.epik-darkblue .nav-secondary .sub-menu a:hover,
.epik-darkblue .site-header .sub-menu a:hover,
.epik-darkblue .site-header .genesis-nav-menu .sub-menu .current-menu-item > a,
.epik-darkblue .genesis-nav-menu .sub-menu .current-menu-item > a,
.epik-darkblue .genesis-nav-menu .sub-menu .current-menu-item > a:hover {
color: #bbb;
}
Since you’re using the darkblue theme it overrides the color. So you can take out the line –
.epik-darkblue .site-header .genesis-nav-menu .sub-menu .current-menu-item > a and add it on its own with the color you want and it should work.