.logo{
    float: left;
    width: 587px;
    line-height: 80px;
}
.logo_img{
    position: relative;
}
.logo_img:after{
    position: absolute;
    content: '';
    background: #e5e5e5;
    width: 1px;
    height: 38px;
    top: 24px;
    right: -15px;
}

.fl{
    float: left;
}
.logo p{
    font-size: 16px;
    color: #666666;
    margin-left: 30px;
}
.nav{
    line-height: 80px;
}
.nav ul li{
    float: left;
    margin-left: 28px;
    position: relative;
}
.nav ul li a{
    color: #333333;
    font-size: 16px;
}
.nav li.active{
    position: relative;
}
.nav li.active:before{
    position: absolute;
    content: '';
    width: 64px;
    height: 4px;
    top: 0;
    left: 50%;
    background: #177edf;
    margin-left: -32px;
}
.nav li.active a{
    font-weight: bold;
}
.nav li a:hover{
    /*font-weight: bold;*/
    color: #197edb;
}
.nav ul li ul{
    position: absolute;
    z-index: 2;
    background: #fff;
    width: 140px;
    text-align: left;
    padding-left: 16px;
    margin-left: -14px;
    display: none;
    border: 1px solid #e0e0e0;
    border-radius: 0;
    box-shadow: 0px 5px 15px grey;
}
.nav dl{
    width: 100%;
}
.nav dl dd{
    height: 35px;
    line-height: 35px;
}
.nav dl dd a{
    color: #616366;
    display: block;
    transition: all .5s;
    font-size: 14px;
}
.nav dl dd a:hover{
    color: #197edb;
}


#overlay{
    position: absolute;
    top: 0px;
    left: 0px;
    bottom: 0;
    right: 0;
    width: 100%;
    height: 100%;
    z-index: 100; /* 此处的图层要大于页面 */
    display:none;
}
.overlay_opacity{
    filter: alpha(opacity=50); /* IE的透明度 */
    opacity: 0.5;  /* 透明度 */
    background: #000;
    width: 100%;
    height: 100%;
}
.app_pic{
    position: absolute;
    top: 60px;
    left: 175px;
}
.app_pic img{
    width: 159px;
    height: 159px;
}
.app_bgimg{
    position: absolute;
    top: 50%;
    left: 50%;
    margin-left: -261px;
    margin-top: -189px;
    z-index: 101;
}
.close{
    position: absolute;
    top: 5px;
    right: 7px;
    font-size: 14px;
    font-weight: 700;
    line-height: 1;
    color: #000;
    text-shadow: 0 1px 0 #fff;
    opacity: .5;
    cursor: pointer;
}