* {
    font-family: SourceHanSansCN, sans-serif;
}

/*公共头部导航---结束---*/
body {
    padding-top: 75px;
}

header {
    width: 100%;
    background: #fff;
    height: 75px;
    line-height: 75px;
    box-shadow: 0px 2px 12px 0px rgba(0,0,0,0.07);
    position: fixed;
    top: 0;
    z-index: 999;
}

header .main {
    width: 1200px;
    margin: 0 auto;
}

header .main .left {
    float: left;
}

header .main .left img {
    height: 36px;
}

header .main .right {
    float: right;
}

header .main .right a {
    font-size: 16px;
    color: #000;
    font-weight: 400;
    margin-right: 120px;
}

header .main .right a:hover {
    color: #2050D1;
    font-weight: 500;
}

header .main .right a:last-child {
    margin-right: 0;
}

header .main .right a.active {
    color: #2050D1;
    font-weight: 500;
}
/*公共头部导航---结束---*/

.banner {
    width: 100%;
    min-width: 1200px;
    height: 400px;
    background: url(https://www.f139content.com/website/sci99/images/about/contact/banner.png) top center no-repeat;
}

.div_main {
    background: #fff;
    width: 1200px;
    min-height: 500px;
    margin: 0 auto;
    padding-bottom: 80px;
}

.clearfix:after {
    visibility: hidden;
    display: block;
    font-size: 0;
    content: " ";
    clear: both;
    height: 0;
}

h2 {
    font: 500 24px / 36px "SourceHanSansCN, sans-serif";
    color: #000;
}

.card-box {
    width: 1206px;
    height: 291px;
    box-sizing: border-box;
    padding: 32px;
    background: #FFFFFF;
    box-shadow: 0 2px 26px 0 rgba(0,0,0,0.13);
    border-radius: 20px;
    position: relative;
    top: -55px;
    left: -3px;
}

.card-box img {
    width: 450px;
    height: 227px;
    float: left;
}

.card-box .text {
    float: left;
    margin-left: 36px;
    padding-top: 12px;
}

.card-box .text .detail, .contact-box .detail {
    margin-top: 16px;
    font-size: 16px;
    line-height: 30px;
    font-weight: 400;
    color: #666;
}

.contact-box {
    padding: 0 32px 0 32px;
}

.contact-box > div {
    float: left;
    margin-right: 32px;
    margin-bottom: 40px;
    width: 552px;
}

.contact-box > div:nth-child(2n) {
    margin-right: 0;
}

.contact-box > div:nth-child(3), .contact-box > div:nth-child(4) {
    margin-bottom: 0;
}