@media screen and (min-width:769px){
    #header_mob{
        display: none;
    }

    .header{
        position: fixed;
        width: 100%;
        height: 60px;
        background: rgba(0,0,0,0.90);
        z-index: 999;
    }

    .header .section-content{
        display: flex;
        justify-content: space-between;
    }
    
    .header .logo img{
        width: 145px;
        height: 60px;
    }
    
    .header .menu{
        width: 70%;
        display: flex;
        justify-content: space-between;
        align-items: center;
        margin-bottom: 0;
    }
    
    .header .menu a{
        color:#fff;
    }
    
    .header .menu .active a{
        color: #3f8ed0;
    }
    
    .header .container{
        padding: 0;
        font-family: inherit;
    }

    .header .language-select{
        display: flex;
        align-items: center;
    }

    .header .language-select img{
        width: 20px;
        margin-right: 5px;
    } 

    .header .language-select select{
        border:none;
        background: transparent;
        color:#fff;
        outline: none;
        border: none;
        flex-shrink: 0;
    }


    .header .language-select select:after {
        content: "\25BC"; /* Unicode编码，表示向下的箭头 */
        position: absolute;
        top: 12px;
        right: 10px;
    }

    .language-select select option {
        padding: 5px;
        background-color: #f9f9f9;
        color: #333;
    }
}

@media screen and (max-width:769px){
    #header{
        display: none;
    }

    #header_mob{
        position: fixed;
        width: 100%;
        height: 60px;
        background: rgba(0,0,0,0.90);
        z-index: 999;
    }

    #header_mob .container{
        position: relative;
        padding: 0;
    }

    #header_mob .section-content{
        display: flex;
        justify-content: space-between;
        align-items: center;
        width: 90%;
        margin: auto;
        font-family: Arial;
    }

    #header_mob img{
        width: 25px;
        height: 25px;
    }

    #header_mob .logo img{
        width: 145px;
        height: 60px;
    }

    #header_mob .menu{
        display: none;
        position: absolute;
        width: 100%;
        top: 60px;
        left: 0;
        background: rgba(0,0,0,0.90);
        z-index: 999;
        color: #fff;
        padding: 20px;
    }

    #header_mob .menu ul{
        width: 90%;
        margin: auto;
    }

    #header_mob .menu ul li{
        padding: 15px 0;
    }

    #header_mob .menu ul li a{
        font-size: 14px;
        line-height: 20px;
        color: #fff;
    }

    #header_mob .menu .active a{
        color: #3f8ed0;
    }

    #header_mob .change{
        display: flex;
        align-items: center;
    }

    #header_mob .language-select{
        display: flex;
        align-items: center;
        margin-right: 20px;
    }

    #header_mob .language-select img{
        width: 20px;
        margin-right: 5px;
    } 

    #header_mob .language-select select{
        border:none;
        background: transparent;
        color:#fff;
        outline: none;
        border: none;
        flex-shrink: 0;
    }


    #header_mob .language-select select:after {
        content: "\25BC"; /* Unicode编码，表示向下的箭头 */
        position: absolute;
        top: 12px;
        right: 10px;
    }

    .language-select select option {
        padding: 5px;
        background-color: #f9f9f9;
        color: #333;
    }
}