@media only screen and (max-width: 767px) {
    .nav {
        position: fixed;
        z-index: 2;
        left: 0;
        top: 0;
    }
    .nav:before, .nav:after {
        content: "";
        position: fixed;
        width: 100vw;
        height: 100vh;
        background: rgba(20, 21, 26,0.6);
        border-bottom-left-radius: 200%;
        z-index: -1;
        -webkit-transition: -webkit-transform cubic-bezier(0.77, 0, 0.175, 1) 0.6s, border-radius linear 0.8s;
        transition: -webkit-transform cubic-bezier(0.77, 0, 0.175, 1) 0.6s, border-radius linear 0.8s;
        transition: transform cubic-bezier(0.77, 0, 0.175, 1) 0.6s, border-radius linear 0.8s;
        transition: transform cubic-bezier(0.77, 0, 0.175, 1) 0.6s, -webkit-transform cubic-bezier(0.77, 0, 0.175, 1) 0.6s, border-radius linear 0.8s;
        -webkit-transform: translateX(100%) translateY(-100%);
        transform: translateX(100%) translateY(-100%);
    }
    .nav:after {
        background: rgba(9,9,12,1);
        -webkit-transition-delay: 0s;
        transition-delay: 0s;
    }
    .nav:before {
        -webkit-transition-delay: .2s;
        transition-delay: .2s;
    }
    .nav__content {
        position: fixed;
        visibility: hidden;
        top: 50%;
        margin-top: 20px;
        -webkit-transform: translate(0%, -50%);
        transform: translate(0%, -50%);
        width: 100%;
        text-align: center;
    }
    .nav__list {
        position: relative;
        padding: 0;
        margin: 0;
        z-index: 2;
    }
    .nav__list-item {
        position: relative;
        display: block;
        -webkit-transition-delay: 0.8s;
        transition-delay: 0.8s;
        opacity: 0;
        text-align: center;
        overflow: hidden;
        -webkit-transform: translate(100px, 0%);
        transform: translate(100px, 0%);
        -webkit-transition: opacity .2s ease, -webkit-transform .3s ease;
        transition: opacity .2s ease, -webkit-transform .3s ease;
        transition: opacity .2s ease, transform .3s ease;
        transition: opacity .2s ease, transform .3s ease, -webkit-transform .3s ease;
        margin-top: 0;
        margin-bottom: 0;
    }
    .nav__list-item a{
        position: relative;
        text-decoration: none;
        overflow: hidden;
        cursor: pointer;
        z-index: 2;
        display: inline-block;
        text-transform: uppercase;
        -webkit-transition: all 200ms linear;
        transition: all 200ms linear;
    }

    .nav__list-item a:hover:after{
        height: 4px;
        opacity: 1;
        left: 0;
        width: 100%;
    }
    .nav__list-item a:hover{
        color: rgba(255,255,255,1);
    }
    .nav__list-item.active-nav a{
        color: rgba(255,255,255,1);
    }
    .nav__list-item.active-nav a:after{
        height: 4px;
        opacity: 1;
        left: 0;
        width: 100%;
    }
    header .container .nav ul{
        display: block;
    }
    header .container .nav ul li{
        margin: 15px 0;
    }
    header .container .nav .burger_links{
        display: inline-block;
        transition-delay: 0.5s;
    }
    .nav ul .header_link :hover{
        color: #979797;
    }
    .header_main .container .nav ul{
        display: block;
        margin-top: 120px;
    }
    .header_main .container .nav ul li{
        margin: 15px 0;
    }
    .header_main .container .nav .burger_links{
        display: inline-block;
        transition-delay: 0.5s;
    }


}
@media only screen and (max-width: 341px){
    header .container .nav .burger_links a{
        margin-right: 19px;
    }
}