/* 768px屏幕以上适用 */
@media only screen and (min-width: 1221px) {

    /* 背景图片 */
    .bg {
        margin: 0 auto;
        max-width: 1903px;
        background: url('../images/bg.png') no-repeat;
    }
    
    /* 导航栏 */
    header{
        margin: 0 auto;
        width: 1072px;
    }

    .container{
        width: 1072px;
        padding-left: 0;
        padding-right: 0;
    }
    .navbar-collapse{
        padding-left: 0;
        padding-right: 0;
    }

    header img {
        box-shadow: 0px 25px 50px rgba(0, 0, 0, 0.25);
        float: left;
    }
    .header_word {
        -webkit-user-select: none;
           -moz-user-select: none;
            -ms-user-select: none;
                user-select: none;
        float: right;
        color: #fff;
        font-size: 14px;
        font-weight: bold;
        margin-top: 42px;
    }
    .header_word li {
        display: inline-block;
        padding: 0 16px;
    }
    .header_word li:last-child{
        padding-left: 16px;
        padding-right: 0;
    }


    .main_article {
        width: 1072px;
        margin: 0 auto;
        -webkit-user-select: none;
           -moz-user-select: none;
            -ms-user-select: none;
                user-select: none;
    }
    .title {
        margin-top: 140px;
        line-height: 90px;
        font-size: 53px;
        color: #fff;
        font-weight: bold;
    }
    .desc {
        margin-top: 72px;
        color: #fff;
        font-size: 16px;
    }
    .arrow_bot {
        float: right;
    }
    .arrow_small_right {
        margin: 26px 0 0 400px;
    }
    .contact_btn {
        float: right;
        margin-top: 20px;
    }
    /* 第一部分内容 */
    .pic_article {
        position: relative;
    }
    .arrow_small_left {
        float: right;
        margin-top:380px;
        margin-right: 88px;
    }
    .pic_article_01 {
        width: 374px;
        float: right;
        margin-top: 42px;
    }
    .pic_article_02 {
        width: 536px;
        float: left;
        margin-top: 52px;
    }
    .pic_article_01 img ,
    .pic_whyus{
        box-shadow: 0px 25px 50px rgba(0, 0, 0, 0.25);
    }

    /* 内容段落css */
    .pic_detail_01 span {
        text-align: center;
        display: block;
        color: #f07f19;
        font-weight: bold;
        font-size: 12px;
        margin-bottom: 6px;
    }
    .pic_detail_02 span {
        text-align: center;
        display: block;
        color: #f07f19;
        font-weight: bold;
        font-size: 12px;
        margin-bottom: 6px;
    }
    .pic_article_01 span img,
    .pic_article_02 span img {
        margin-right: 8px;
    }
    .pic_detail_01,
    .pic_detail_02 {
        text-align: center;
        margin: 0 auto;
        font-size: 24px;
        line-height: 30px;
    }
    .pic_detail_01 {
        margin-left: -120px;
        width: 556px;
        margin-top: 228px;
        
    }
    .pic_detail_02 {
        width: 454px;
        margin-top: 162px;
    }
    /* 分割线 */
    .seperate_line {
        margin: 120px auto 110px auto;
        width: 1170px;
        border: 1px dashed #ccc;
    }
    /* 第二部分内容 */
    .second_article {
        -webkit-user-select: none;
           -moz-user-select: none;
            -ms-user-select: none;
                user-select: none;
        position: relative;
        margin: 0 auto;
        width: 1170px;
    }
    .second_intro_1 {
        text-align: center;
        margin-bottom: 128px;
    }
    .second_intro_1 .pic_who {
        float: left;
        margin-left: 100px;
    }
    .arrow_right {
        display: block;
        float: left;
        margin-top: 270px;
        margin-left: 200px;
    }
    .second_intro_2 .pic_whyus {
        margin-right: 116px;
    }

    .pic_whyus{
        float: left;
    }
    .whyus_details{
        width:31%;
        float: left;
    }

    .whyus_details p{
        font-size: 14px;
    }

    .whyus_details .whyus_title{
        font-size: 34px;
        font-weight: bold;
    }
    .whyus_details_title{
        margin-bottom:10px;
    }
    .whyus_para p span{
        display: inline-block;
        line-height: 70px;
        font-size: 38px;
        font-weight: bold;
        color:#d9d9d9;
        margin-right: 12px;
    }
    .whyus_para .para{
        font-size: 16px;
        color:#f07f19;
    }

    .whyus_explain{
        font-size: 14px;
        line-height: 20px;
    }

    .form {
        margin-top: 138px;
    }
    .form iframe{
        background: url("../images/form-bg.jpg") no-repeat;
        width: 100%;
    }
    /* 第二部分内容里八图展示 */
    .second_dodetails {
        margin: 0 auto;
    }
    .second_dodetails .img_title {
        font-size: 32px;
        font-weight: bold;
        margin-bottom: 102px;
    }
    .second_dodetails ul li {
        -webkit-user-select: none;
           -moz-user-select: none;
            -ms-user-select: none;
                user-select: none;
        display: inline-block;
        vertical-align: top;
    }
    .second_dodetails ul li:nth-child(1) {
        margin-right: 53px;
    }
    .second_dodetails ul li:nth-child(2) {
        margin-left: 51px;
        margin-right: 51px;
    }
    .second_dodetails ul li:nth-child(3) {
        margin-left: 51px;
        margin-right: 51px;
    }
    .second_dodetails ul li:nth-child(4) {
        margin-left: 53px;
    }
    .second_dodetails ul li:nth-child(5) {
        margin-right: 53px;
    }
    .second_dodetails ul li:nth-child(6) {
        margin-left: 51px;
        margin-right: 51px;
    }
    .second_dodetails ul li:nth-child(7) {
        margin-left: 51px;
        margin-right: 51px;
    }
    .second_dodetails ul li:nth-child(8) {
        margin-left: 53px;
    }
    .second_dodetails ul li:nth-child(even) {
        margin-top: 50px;
    }
    .second_dodetails ul li p {
        font-size: 20px;
        font-weight: bold;
        margin-top: 16px;
        margin-bottom: 10px;
    }
    .second_dodetails ul li span {
        width: 190px;
        display: block;
        line-height: 22px;
        font-size: 14px;
        color: #f07f19;
    }
    .second_dodetails .second_dodetails_span{
        
    }
    /* 视频 */
    .video {
        background-image: url("../images/video-bg.png");
        margin-top: 150px;
    }
    .video .video_button {
        cursor: pointer;
        display: block;
        margin: 0 auto;
        padding-top: 86px;
        padding-bottom: 86px;
    }
    .ad_video{
        width: 90%;    
        display: none;
        position: fixed;
        top:0;
        left:10%;
        height:100%;
        z-index: 1999;
    }
    .ad_video iframe{
        float: left;
        width: 90%;
        margin: 0 auto;
    }

    .cancel{
        -webkit-user-select: none;
           -moz-user-select: none;
            -ms-user-select: none;
                user-select: none;
        float: left;
        font-size: 34px;
        color: #fff;
        width: 50px;
        height: 50px;
        border-radius: 100%;
        border: none;
        background-color: #000;
    }
    /* 合作伙伴 */
    .partners {
        -webkit-user-select: none;
           -moz-user-select: none;
            -ms-user-select: none;
                user-select: none;
        width: 1180px;
        margin: 0 auto;
        margin: 132px auto 156px auto;
    }
    .partners p {
        width: 370px;
        border-bottom: 4px solid #f07f19;
        padding-bottom: 8px;
        padding-left: 20px;
        font-size: 32px;
        font-weight: bold;
        margin: 0 auto 105px auto;
    }
    /* .partners_01 {
        margin-left: 20px;
    } */

    /* 返回顶部按钮 */
    #returnBtn {
        background-color: transparent;
        display: none;
        position: fixed;
        bottom: 20px;
        right: 30px;
        z-index: 99;
        border: none;
        outline: none;
        cursor: pointer;
        padding: 0;
    }
    #returnBtn img{
        width:60px;
        height:60px;
    }

    /* 网页页脚 */
    footer {
        -webkit-user-select: none;
           -moz-user-select: none;
            -ms-user-select: none;
                user-select: none;
        background: url("../images/footer-bg.png") no-repeat;
        width: 100%;
        color: #fff;
        height: 307px;
    }
    .footer_details {
        width: 1072px;
        margin: 0 auto;
    }
    .footer_details .footer_logo {
        float: left;
        margin-top: 62px;
        margin-left: 212px;
        width: 200px;
    }
    .footer_details .footer_logo p {
        line-height: 20px;
        font-size: 14px;
        padding-top: 24px;
    }
    .footer_company {
        float: left;
        margin-top: 64px;
        margin-left: 200px;
    }
    .footer_company dt {
        line-height: 30px;
        font-size: 14px;
        font-weight: bold;
    }
    .footer_company dd {
        font-size: 14px;
        line-height: 32px;
    }
    .footer_connect {
        float: left;
        margin-top: 64px;
        margin-left: 186px;
    }
    .footer_connect dt {
        line-height: 30px;
        font-size: 14px;
        font-weight: bold;
    }
    .footer_connect dd {
        font-size: 14px;
        line-height: 32px;
    }
    .footer_date {
        padding-top: 18px;
        font-size: 14px;
        text-align: center;
    }

    /* 视频遮罩层 */
    .bg_mask {
        display: none;
        position: fixed;
        background-color: #666;
        width: 100%;
        height: 100%;
        z-index: 1000;
        top: 0;
        left: 0;
        opacity: 0.7;
    }


}