@media screen and (max-width:768px){

    .nav_pc {
        display: none;
    }


    .nav_mobile{
        width: 100vw;
        position: fixed;
        z-index: 999;
        left: 0;
        top: 0;
    }

    .nav_mobile > div:nth-of-type(1){
        background-color: black;
        height: 1.5rem;
        line-height: 1.5rem;
    }
    .nav_mobile .change{
        background-color: #3b4249;
        text-align: center;
    }
    .nav_mobile .change a{
        border-radius: 3px;
        background-color: #bcbcbc;
        float: right;
        width: 15vw;
        height: 3vh;
        color: #0C0C0C;
        margin-right: 3vh;
        font-size: 0.3rem;
        line-height:3vh;
    }
    .nav_mobile .top{
        display: flex;
        align-items: center;
    }

    .nav_mobile .heng{
        width: 7%;
        margin-left: 5%;
        height: 0.8rem;
        position: relative;
    }

    .nav_mobile .heng span{
        color: white;
        position: absolute;
        font-size: 2rem;
        display: block;
        height: 1px;
        width: 17px;
        background: white;
        border-radius: 0.5px;
    }

    .nav_mobile .s{
        z-index: 9;
        top: 0.25rem;
    }

    .nav_mobile .x{
        z-index: 10;
        top: 0.45rem;
    }

    .nav_mobile .moves{
        transition: transform .1596s cubic-bezier(0.52, 0.16, 0.52, 0.84) .1008s, -webkit-transform .1596s cubic-bezier(0.52, 0.16, 0.52, 0.84) .1008s;
        transform: rotate(45deg) translateY(0.13rem);
        -webkit-transform: rotate(45deg) translateY(0.13rem);
    }

    .nav_mobile .movex{
        transition: transform .1596s cubic-bezier(0.52, 0.16, 0.52, 0.84) .1008s,
        -webkit-transform .1596s cubic-bezier(0.52, 0.16, 0.52, 0.84) .1008s;
        transform: rotate(-45deg) translateY(-0.13rem);
        -webkit-transform: rotate(-45deg) translateY(-0.13rem);
    }

    .nav_mobile .movesh{
        transition: transform .1596s cubic-bezier(0.52, 0.16, 0.52, 0.84) .1008s, -webkit-transform .1596s cubic-bezier(0.52, 0.16, 0.52, 0.84) .1008s;
        transform: rotate(0deg);
        -webkit-transform: rotate(0deg);
    }

    .nav_mobile .movexh{
        transition: transform .1596s cubic-bezier(0.52, 0.16, 0.52, 0.84) .1008s,
        -webkit-transform .1596s cubic-bezier(0.52, 0.16, 0.52, 0.84) .1008s;
        transform: rotate(0deg);
        -webkit-transform: rotate(0deg);
    }

    .nav_mobile .top img{
        width: 20%;
        margin-left: 28%;
        /*height: 0.8rem;*/
    }

    .nav_mobile .show{
        position: fixed;
        left:0;
        top: 1.5rem;
        z-index: 9;
        width: 100vw;
        /*padding: 5vh 10vw 10vh 10vw;*/
        padding: 0 10vw 0 10vw;
        background-color: rgba(4,4,4,100);
        height: 0;
        overflow: hidden;
        transition: height 1s;
        -moz-transition:height 1s; /* Firefox 4 */
        -webkit-transition:height 1s; /* Safari and Chrome */
        -o-transition:height 1s; /* Opera */
    }

    .nav_mobile ul{
        margin-top: 5vh;
    }

    .nav_mobile li{
        color: gainsboro;
        border-top: 1px solid gainsboro;
        font-size: 0.6rem;
        height: 2rem;
        line-height: 2rem;
    }

    .nav_mobile .showdown{
        height: 67vh !important;
        /*min-height: 40vh;*/
        /*padding: 5vh 10vw 10vh 10vw !important;*/
        /*transition: height 1.2s;*/
    }
    a{
        color: #b8b8b8;
    }

}