@media screen and (max-width: 1280px) {

    .w {
        width: 96%;
    }

    /* 顶部 */
    .header .logo_01 {
        margin-left: 30%;
    }
    .header form {
        float: left;
        margin-top: 21px;
        margin-left: 40%;
    }

    .header .nav-home  {
        display: block;
        float: right;
        margin-top: 25px;
    }
    

    /* 导航栏 */
    .nav {
        display: none;
    }


    /* phone导航栏 */
    body {
        position: relative;
    }

    .nav1 {
        width: 100%;
        height: 100%;
        background: rgba(0, 0, 0, 0.4);
        display: block;
        position: fixed;
        top: 0;
        left: -100%;
        overflow-y: scroll;
        transition: all 0.7s;
        z-index: 9999999;
    }

    .nav1 .nav-auto {
        width: 100%;
        height: auto;
        min-height: 1080px;
        margin: 0;
        overflow-y: scroll;
        background-color: #3a3a3a;
    }

    .left {
        left: 0;
    }

    .nav1 .nav-auto .phone_ul1 {
        width: 100%;
        height: 100%;
        background-color: #3a3a3a;
    }

    .nav1 .nav-auto .phone_ul1 .dhang {
        width: auto;
        height: 70px;
        line-height: 70px;
        background: #2c2c2c;
    }

    .nav1 .nav-auto .phone_ul1 .dhang span {
        margin-left: 24px;
        font-size: 24px;
        color: #fff;
    }

    .nav1 .nav-auto .phone_ul1 .dhang .x1 {
        width: 22px;
        margin-right: 24px;
    }

    .nav1 .nav-auto .phone_ul1 li {
        width: 100%;
        text-align: left;
    }

    .nav1 .nav-auto .phone_ul1 li a {
        float: left;
        width: 80%;
        line-height: 60px;
        display: block;
        height: 100%;
        font-size: 20px;
        color: #fff;
        transition: none;
        padding-left: 20px;
        border-bottom: 1px solid #525252;
        overflow: hidden;
        text-overflow: ellipsis;
        -webkit-line-clamp: 1;
        -webkit-box-orient: vertical;
    }

    .nav1 .nav-auto .phone_ul1 li .drop_01 {
        float: left;
        text-align: center;
        width: 20%;
        height: 61px;
        line-height: 61px;
        background: #3a3a3a;
        border-left: 2px solid #525252;
        border-bottom: 1px solid #525252;
    }

    .nav1 .nav-auto .phone_ul1 li .drop_01 img {
        width: 20px;
    }

    .nav1 .nav-auto .phone_ul1 li.active {
        background-color: #393939;
    }

    .nav1 .nav-auto .phone_ul1 li.active a {
        background: none;
        font-weight: bold;
        color: #ffffff;
    }

    .nav1 .nav-auto .phone_ul1 li:hover a {
        background: none;
        font-weight: bold;
    }

    .nav1 .nav-auto .phone_ul1 li .phone_ul2 {
        background-color: #282828;
        display: none;
    }

    .nav1 .nav-auto .phone_ul1 li .phone_ul2 li a {
        font-size: 20px;
        line-height: 60px;
        padding-left: 30px;
    }

    .nav1 .nav-auto .phone_ul1 li .phone_ul2 li .drop_02 {
        float: left;
        text-align: center;
        width: 20%;
        height: 61px;
        line-height: 61px;
        background: #282828;
        border-left: 2px solid #525252;
        border-bottom: 1px solid #525252;
    }

    .nav1 .nav-auto .phone_ul1 li .phone_ul2 li .drop_02 img {
        width: 20px;
    }

    .nav1 .nav-auto .phone_ul1 li .phone_ul2 li .phone_ul3 {
        background-color: #000000;
        display: none;
    }

    .nav1 .nav-auto .phone_ul1 li .phone_ul2 li .phone_ul3 li a {
        float: none;
        width: 100%;
        font-size: 18px;
        line-height: 50px;
        padding-left: 40px;
        border-bottom: 1px solid #525252;
    }



}

@media screen and (max-width: 900px) {
    /* 顶部 */
    .header .logo_01 {
        margin-left: 25%;
    }
    
    .header form {
        margin-left: 36%;
    }

}

@media screen and (max-width: 800px) {
    /* 顶部 */
    .header .logo_01 {
        margin-left: 18%;
    }

}

@media screen and (max-width: 700px) {
    /* 顶部 */
    .header .logo_01 {
        margin-left: 14%;
    }
    
    .header form {
        margin-left: 30%;
    }

}

@media screen and (max-width: 650px) {
    /* 顶部 */
    .header .logo_01 {
        margin-left: 10%;
    }
    
    .header form {
        margin-left: 28%;
    }

}

@media screen and (max-width: 600px) {
    /* 顶部 */
    .header .logo_01 {
        margin-left: 3%;
    }
    
    .header form {
        margin-left: 25%;
    }

}

@media screen and (max-width: 550px) {
    /* 顶部 */
    .header .logo_01 {
        margin-left: 0;
    }

}

@media screen and (max-width: 512px) {
    /* 顶部 */
    .header .logo_01 {
        width: 99%;
        height: auto;
    }

    .header .logo_01 img {
        height: auto;
    }
    
    .header form {
        margin-left: 0;
    }

}