:root {
    --primary-alpha: rgba(35,35,35, 0);
    --menu-transition-duration: 250ms;
    --header-size: 4em;
}

header {
    position: fixed;
    top: 0;
    left: 0;
    background: var(--primary-alpha);
    color: var(--primary-font);
    width: 100%;
    height: var(--header-size);
    display: flex;
    justify-content: center;
    text-shadow: 0 0 2px #000;
    transition: background 500ms ease-in-out;
}
header a, header a:hover {
    border: none;
    text-decoration: none;
}
header li a {
    color: var(--primary-font);
    text-decoration: none;
    border: none;
}
header li a:hover {
    border: none;
}
header li a::after {
    content: '';
    display: block;
    height: 3px;
    margin-top: 7px;
    background: #FFF;
    transform: scale(0,1);
    transform-origin: center;
    transition: transform var(--menu-transition-duration) ease-in-out;
}
header li a:hover:after {
    transform: scale(1,1);
}


.header-wrapper {
    width: var(--inner-width);
    margin: 0 auto;
    max-width: var(--inner-max-width);
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    position: relative;
}

#logo {
    height: 100%;
    padding: 15px;
    font-family: "DLE Digital";
    font-size: 1.5em;
}
.header-wrapper a img {
    width: auto;
    height: 100%;
}

.menu-icon, .menu-icon::before, .menu-icon::after {
    position: absolute;
    top: 40%;
    right: 0;
    background: #FFF;
    height: 2px;
    display: none;
    width: 2em;
    content: '';
}
.menu-icon::before {
    top: 14px;
}
.menu-icon::after {
    top: 7px;
}

nav {
    font-size: 1.25em;
    flex: 1;
}
nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    justify-content: flex-end;
    flex-wrap: wrap;
}
nav li {
    margin-left: 70px;
}

.nav-toggle {
    display: none;
}

@media (max-width: 900px) {
    .menu-icon, .menu-icon::before, .menu-icon::after {
        display: block !important;
    }
    nav {
        position: absolute;
        top: 100%;
        right: 0;
        background: var(--primary);
        transform: scale(1,0);
        transform-origin: top;
        transition: transform 250ms ease-in-out;
    }
    nav ul {
        flex-direction: column;
        justify-content: flex-start;
    }
    nav li {
        margin: 0;
        border-bottom: 1px dashed gray;
    }
    nav li:first-child {
        border-top: 1px solid #FFF;
    }
    nav li:last-child {
        border: none;
    }
    nav li a {
        display: block;
        padding: 15px 50px;
    }
    nav li a:hover {
        border: initial;
    }

    .nav-toggle:checked ~ nav {
        display: block;
        transform: scale(1,1);
    }
    .nav-toggle:not(:checked) ~ nav {
        transform: scale(1,0);
    }

    /** cool animation **/

    .nav-toggle:checked ~ label .menu-icon:before {
        opacity: 0;
    }
    .nav-toggle:not(:checked) ~ label .menu-icon:before {
        transition: opacity 0ms linear var(--menu-transition-duration);
    }
    .nav-toggle:checked ~ label .menu-icon {
        transform: rotate(45deg);
    }
    .nav-toggle:checked ~ label .menu-icon:after {
        transform: translateY(-7px) rotate(270deg);
    }
    .nav-toggle:checked ~ label .menu-icon, .nav-toggle:checked ~ label .menu-icon:after {
        transition: transform var(--menu-transition-duration) ease-in-out;
    }
    .nav-toggle:not(:checked) ~ label .menu-icon, .nav-toggle:not(:checked) ~ label .menu-icon:after {
        transition: transform var(--menu-transition-duration) ease-in-out;
    }
}

header.scrolled {
    background: var(--primary);
}

.menu-icon, .menu-icon::before, .menu-icon::after {
    position: absolute;
    top: 40%;
    right: 0;
    background: #FFF;
    height: 2px;
    display: none;
    width: 2em;
    content: '';
}
.menu-icon::before {
    top: 14px;
}
.menu-icon::after {
    top: 7px;
}

.lang-flags {
    text-align: center;
}


@media (max-width: 900px) {
    .menu-icon {
        display: block;
    }
    .lang-flags {
        padding: 10px;
    }
    header li a:after {
        content: none;
    }
}