@media (max-width: 850px) {
    .nav-list {
        display: none;
    }
    .nav-button {
        display: block;
    }
    .nav.open .nav-list {  
        position: fixed;
        top: 0;
        bottom: 0;
        left: 0;
        right: 0;
        background-color: #fff;
        z-index: 1;
        padding: 30px 20px;
        display: flex;
        flex-direction: column;
        row-gap: 20px;
        font-size: 26px;
        font-weight: 600;
    }
    .nav-link {
        color: #828282;
    }
    .nav-button {
        position: fixed;
        z-index: 9;
        top: 70px;
        right: 30px;
    }
    .nav-item {
        text-align: left;
    }
    .nav-item a:hover {
        color: #510000;
    }
    .nav-link.active {
        color: #000;
    }
    .nav-item:hover {
        background-color: #fff;
    }
    .nav-item.active {
        background-color: #fff;
    }
    .big-slider {
        display: none;
    }
}

@media (max-width: 600px) {
    .head-contacts {
        font-size: 18px;
        font-weight: 600;
    }
    .product_name {
        font-size: 24px;
        padding-bottom: 25px;
    }
}

@media (max-width: 425px) {
    .pop_up_body {
        width: 315px;
    }
    .pop_up_body input, .pop_up_body textarea  {
        width: 280px;
    }
}