Also...

How could I set the same link colour and mouseover colour for ALL links sitewide?

FYI, I have tried setting the Link Color and Link Hover Color in Layout / Header / Settings, but nothing changes. I cleared both my browser cache and Joomla cache after making the changes.

Hey Adam,

All these link colour is respected from this major colour from the template presets setting http://take.ms/2u0A3 .

In order to show the immediately changes, ensure that you have to enable this setting Compile LESS to CSS setting under advanced tab http://take.ms/o5mmh .

And make sure that you have temporary disable your site cache if you have enable it from your site backend.

If you would like to change that hover link colour, unfortunately currently that is no setting for this, but you can try apply this following custom css into your template under custom css section http://take.ms/mhCYe and see how it goes.

#vanilla-submenu > ul > li > span, 

#vanilla-submenu > ul > li > a {

    color: #eb4947 !important;

    opacity: 1 !important;

}



#vanilla-submenu > ul > li > span:hover, 

#vanilla-submenu > ul > li > a:hover {

    color: #eb4947 !important;

}

Note : change this color code #eb4947 to your current presets major link color code http://take.ms/oxnmR

If it doesn't change anything, perhaps you can update your site backend and FTP access at http://stackideas.com/dashboard/site so we can better have a check.