header {
    display: flex;
    flex-wrap: nowrap;
    padding: 20px;
    padding-bottom: 0;
    margin-bottom: 10px;
    border-bottom: 1px solid #003471;
}
.logo {
    max-width: 300px;
}

.menu {
    flex-grow: 1;
    display: flex;
    flex-wrap: nowrap;
    align-items: center;
}
.menu-item {
    flex-grow: 1;
    text-align: center;
    padding: 10px;
}
.menu-item a {
    text-transform: uppercase;
    font-weight: bold;
    font-size: 16pt;
}

@media (max-width: 1000px) {
    body {
        padding-left: 20px;
        padding-right: 20px;
    }
}
@media (max-width: 850px) {
    .menu {
        flex-wrap:wrap;
    }
    .menu-item {
        flex-basis: calc(50% - 20px);
        flex-shrink: 0;
    }
}

@media (max-width: 650px) {
    header {
        flex-wrap: wrap;
        flex-direction: column;
    }
    .logo {
        text-align: center;
        max-width: 100%;
    }
    .logo img {
        max-width: 300px;
    }
}

@media (max-width: 480px) {
    .logo img {
        width: 100%;
    }
}