header {
    position: absolute;
    top: 0; left: 0;
    width: 100%;
    height: 120px;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: all .3s;
    z-index: 98;
}

nav {
    width: 1400px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    width: 140px;
}


/*==================================================*/
@media (max-width: 1450px) {
    nav {
        width: 100%;
        padding: 0 20px;
    }
}


@media (max-width: 768px) {
    header {
        height: 100px;
    }
}


@media (max-width: 550px) {
    header {
        height: 80px;
    }
    
    .logo {
        width: 100px;
    }
}