.banner {
    position: relative;
    height: 320px;
    min-width: 1180px;
    overflow: hidden;
    background-color: black;
}

.banner span {
    position: absolute;
    display: block;
    font-size: 0;
    width: 1920px;
    min-width: 1180px;
    height: 320px;
    left: 50%;
    margin-left: -960px;
    background: url(../img/banner/banner-about.jpg) no-repeat;
}


/* 小菜单 */

.top-nav {
    background-color: #f5f5f5;
    height: 50px;
    line-height: 50px;
    text-align: center;
    border-bottom: 1px solid #e9e9e9;
}

.top-nav li {
    float: left;
    width: 33.33%;
    font-size: 13px;
}

.top-nav li a {
    display: block;
    width: 100%;
    height: 50px;
    line-height: 50px;
    font-size: 13px;
    color: #666;
}

.top-nav li a:hover {
    background-color: #e5e5e5;
}

.top-nav .active {
    background-color: #fff;
    border-left: 1px solid #e9e9e9;
    border-right: 1px solid #e9e9e9;
}


/* 标题 */

.title {
    text-align: center;
    margin-top: 80px;
    margin-bottom: 40px;
}

.title h3 {
    color: #c5c5c5;
    font-size: 15px;
    font-weight: 400;
}

.title h2 {
    color: #666;
    font-size: 22px;
}

.intro {
    margin-top: 30px;
    margin-bottom: 80px;
}

.intro .intro_left {
    position: relative;
    float: left;
}

.intro .intro_left .pic {
    position: absolute;
    top: -20px;
    right: -20px;
    width: 210px;
    height: 125px;
    padding: 10px;
    text-align: center;
    background-color: rgba(0, 0, 0, .3);
}

.intro .intro_left .pic h2 {
    display: inline-block;
    margin-right: 12px;
    font-size: 40px;
    color: white;
    font-weight: bold;
}

.intro .intro_left .pic span {
    font-size: 20px;
    color: white;
    font-weight: bold;
}

.intro .intro_left img {
    width: 500px;
    height: 300px;
}

.intro .intro_right {
    float: right;
    width: 650px;
    height: 300px;
    padding: 35px 20px;
    box-shadow: 0 10px 30px 0 rgb(0 0 0 / 10%);
}

.intro .intro_right p {
    color: #666;
    font-size: 14px;
    line-height: 30px;
    margin: 15px 0;
}


/* 客户 */

.client {
    margin-bottom: 50px;
    text-align: center;
}

.client li {
    float: left;
    width: 185px;
    height: 105px;
    line-height: 105px;
    margin-right: 10px;
    margin-bottom: 25px;
    box-shadow: 0 2px 10px 0 rgb(0 0 0 / 8%);
}

.client img {
    width: 130px;
}