How to add and remove class of one element while hovering over another element via Angular?

I'd like to add a class to an <li> when it's child <a> gets hovered over but I can't seem to get it to work. What is happening is that no matter what <a> element is hovered over, only the first <li> gets affected so I need to be able to target only the parent <li> of the <a> that is currently being hovered over.

Here is what I have so far:

http://ift.tt/1Ht1BXh

and here is the code:

Controller (Javascript)

var myApp = angular.module('myApp',[]);
myApp.controller("Ctrl", function($scope){
    $scope.addClass = function(){
        angular.element(document.querySelector('.li-hover')).addClass('hovering');
    }
    $scope.removeClass = function(){
        angular.element(document.querySelector('.li-hover')).removeClass('hovering');
    }
});

HTML

<div ng-app='myApp'>
    <div ng-controller="Ctrl">
        <ul>
            <li class="li-hover" >
                <a href="" ng-mouseover="addClass()" ng-mouseleave="removeClass()">
                    <span>Home</span>
                </a>
            </li>
            <li class="li-hover" >
                <a href="" ng-mouseover="addClass()" ng-mouseleave="removeClass()">
                  <span>About</span>
                </a>
            </li>
            <li class="li-hover" >
                <a href="" ng-mouseover="addClass()" ng-mouseleave="removeClass()">
                  <span>Contact</span>
                </a>
            </li>
        </ul>
    </div>
</div>

CSS

.hovering {
    background-color: pink;
    border-bottom: 5px solid red;
}
li {
    margin: 1em;
    padding: 2em;
    border-bottom: 5px solid #aaa;
    background: #ccc;
}
a { 
    background: white;
    padding: 0.5em;
}