header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    border-bottom: 1px solid #8888;
    background-color: var(--background);
    z-index: 1;

    transition: color .2s, background-color .2s;
}

nav {
    width: min(calc(100% - 4rem), 720px);
    height: 3em;
    margin: auto;
    padding: 0 1em;
    display: flex;
    flex-direction: row;
    gap: .8em;
    align-items: center;
}

#header-home {
    flex-grow: 1;
    display: flex;
    gap: .5em;
}

img#header-icon {
    width: 2em;
    height: 2em;
    margin: .5em;
    display: block;
}

#header-text {
    display: flex;
    flex-direction: column;
    justify-content: center;
}

#header-text h1 {
    width: fit-content;
    margin: 0;
    font-size: 1em;
}

#header-text h2 {
    width: fit-content;
    height: 1.2em;
    line-height: 1.2em;
    margin: 0;
    font-size: .7em;
    color: #bbb;
}

#header-links-toggle {
    width: 3em;
    height: 3em;
    display: none;
    justify-content: center;
    align-items: center;
    transition: background-color .2s;
}

#header-links-toggle:hover {
    background-color: #fff2;
}

header ul#header-links {
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: row;
    gap: .5em;
    align-items: center;
}

header ul li {
    list-style: none;
}

header ul li a,
header ul li span {
    padding: .4em .5em;
    border: 1px solid var(--links);
    color: var(--links);
    border-radius: 2px;
    background-color: transparent;
    transition-property: color, border-color, background-color;
    transition-duration: .2s;
    animation-delay: 0s;
    animation: list-item-fadein .2s forwards;
    opacity: 0;
    text-decoration: none;
}

header ul li span {
    color: #aaa;
    border-color: #aaa;
    cursor: default;
    text-decoration: none;
}

header ul li a:hover {
    color: #eee;
    border-color: #eee;
    background-color: var(--links) !important;
    text-decoration: none;
}


#toggle-crt a {
    color: var(--primary);
    border-color: var(--primary);
    opacity: 1;
}

#toggle-crt a:hover {
    color: #111;
    background-color: var(--primary) !important;
}

#toggle-crt.disabled a {
    opacity: .5 !important;
}

@media screen and (max-width: 780px) {
    header {
        font-size: 14px;
    }

    nav {
        width: calc(100vw - 2rem);
        margin: 0;
    }

    div#header-text {
        flex-grow: 1;
    }

    a#header-links-toggle {
        display: flex;
    }

    header ul#header-links {
        position: fixed;
        left: 0;
        top: 2.7rem;
        width: calc(100vw - 2rem);
        padding: 1rem;
        flex-direction: column;
        gap: 1rem;
        border-bottom: 1px solid #888;
        background-color: var(--background);
        display: none;
    }

    header ul#header-links.open {
        display: flex;
    }

    ul#header-links li {
        width: 100%;
    }	

    ul#header-links li a,
    ul#header-links li span {
        margin: 0;
        display: block;
        font-size: 1em;
        text-align: center;
    }
}

@keyframes list-item-fadein {
    from {
        opacity: 1;
        background: #fff8;
    }

    to {
        opacity: 1;
        background: transparent;
    }
}

