.nav_ac, .nav_ac ul, .nav_ac li {
    list-style: none;
    border-top: 1px solid rgb(223, 223, 223);
}

.nav_ac ul {
    padding: 0;
    margin: 0 0 0 14px;
}

.nav_ac {
    padding: 0;
    margin: 0px;
    background-color: #f2f2f2;
}

.nav_ac > li {
    /* margin: 4px 0; */
}

.nav_ac > li li {
    /* margin: 2px 0; */
}

.nav_ac a {
    color: #333;
    display: block;
    outline: none;
    /* -webkit-border-radius: 4px; */
    -moz-border-radius: 4px;
    /* border-radius: 4px; */
    text-decoration: none;
}

.nav_ac li > a > span {
    float: right;
    font-size: 19px;
    font-weight: bolder;
    width:20px;
    text-align:center;
}

.nav_ac li > a:hover > span {
    color: #fff;
}

.nav_ac li > a > span:after {
    content: '\25be';
}
.nav_ac li.open > a > span:after {
    content: '\25b4';
}

.nav_ac a:hover, .nav_ac li.active > a {
    background-color: #9C9C9C;
    color: #f5f5f5;
}

.nav_ac > li.active > a  {
    background-color: #1e3f4f;
}

.nav_ac li a {
    font-size: 12px;
    line-height: 18px;
    padding:2px 2px 2px 8px;
}

.nav_ac > li > a {
    font-size: 16px;
    line-height: 21px;
    padding: 6px 2px 6px 8px;
}