[css-d] trouble with responsive horizontal menu

[Chris Kavinsky]

I'm trying to retrofit a client site to be responsive and running into an
issue with the navigation. I want the horizontal menu to collapse when
smaller and appear on-click but having issue getting the click to work.
Below is the live site and I've also included the css. What am I
overlooking?

http://www.aircompressors.com/


/* =Menu
-------------------------------------------------------------- */

#primary-navigation {
    background: #005E9B;
    display: block;
    float: left;
    margin: 0 auto;
    width:100%;
    max-width: 940px;
}

#primary-navigation .menu-main-navigation-container,
.menu {
    font-size: 14px;
    margin-left: 50px;
    max-width: 928px;
}

#primary-navigation .menu-main-navigation-container ul,
.menu ul {
    list-style: none;
    margin: 0;
}

#primary-navigation .menu-main-navigation-container li,
.menu li {
    float: left;
    position: relative;
}

    /*Style 'show menu' label button and hide it by default*/
.show-menu {
    font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
    text-decoration: none;
    color: #fff;
    background: #005E9B;
    text-align: center;
    padding: 10px 0;
    display: none;
}

#primary-navigation a {
    color: #fff;
    display: block;
    line-height: 38px;
    padding: 0 10px;
    text-decoration: none;
}
#primary-navigation ul ul {
    box-shadow: 0px 3px 3px rgba(0,0,0,0.2);
    -moz-box-shadow: 0px 3px 3px rgba(0,0,0,0.2);
    -webkit-box-shadow: 0px 3px 3px rgba(0,0,0,0.2);
    display: none;
    position: absolute;
    top: 38px;
    left: 0;
    float: left;
    width: 180px;
    z-index: 99999;
}
#primary-navigation ul ul li {
    min-width: 180px;
}
#primary-navigation ul ul ul {
    left: 100%;
    top: 0;
}
#primary-navigation ul ul a {
    background: #005e9b;
    line-height: 1em;
    padding: 10px;
    width: 160px;
    height: auto;
}
#primary-navigation li:hover > a,
#primary-navigation ul ul :hover > a {
    background: #A82B44;
    color: #fff;
}
#primary-navigation ul li:hover > ul {
    display: block;
}
#primary-navigation ul li.current_page_item > a,
#primary-navigation ul li.current-menu-ancestor > a,
#primary-navigation ul li.current-menu-item > a,
#primary-navigation ul li.current-menu-parent > a {
    color: #fff;
}
* html #primary-navigation ul li.current_page_item a,
* html #primary-navigation ul li.current-menu-ancestor a,
* html #primary-navigation ul li.current-menu-item a,
* html #primary-navigation ul li.current-menu-parent a,
* html #primary-navigation ul li a:hover {
    color: #fff;
}

/*Hide checkbox*/
input[type=checkbox]{
    display: none;
}

/*Show menu when invisible checkbox is checked*/
input[type=checkbox]:checked ~ #menu{
    display: block;
}

@media screen and (max-width : 870px){
    /*Make dropdown links appear inline*/
#primary-navigation .menu-main-navigation-container ul,
.menu ul {
        position: static;
        display: none;
    }

    /*Create vertical spacing*/
#primary-navigation .menu-main-navigation-container li,
.menu li {
        margin-bottom: 1px;
    }

    /*Make all menu links full width*/
#primary-navigation .menu-main-navigation-container li,
.menu li, #primary-navigation a {
        width: 100%;
    }

    /*Display 'show menu' link*/
    .show-menu {
        display:block;
    }

}
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