pb33f-header {
    position: fixed;
    width: 100%;
    z-index: 11;
    top: 0;
}

.site-header {
    display: flex;
    height: 57px;
    flex-direction: row;
    width: 100vw;
    background-color: var(--background-color);

}

.site-header nav {
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: row;

}

.site-header  nav a {
    display: inline-block;
    height: 40px; /* tip this 1px over the edge to create a tab */
    border-left: 1px dashed var(--secondary-color);
    border-bottom: 1px dashed var(--secondary-color);
    padding: 15px 20px 0 20px;
    background-color: var(--background-color);
    font-weight: normal;
}

.site-header  nav a:hover {
    font-weight: normal;
    text-decoration: underline;
}

.site-header  nav a:active {
    text-decoration: underline;
    color: var(--secondary-color)
}


.site-header  nav a.selected {
    background: rgb(0,0,0);
    background: var(--main-nav-selected-background);
    border-bottom: none;
    font-family: var(--font-stack-bold);
    color: var(--secondary-color);
    text-shadow:  0 0 5px var(--secondary-color-text-shadow), 0 0 10px var(--secondary-color-text-shadow-outer);
}

.site-header  nav a:last-child {
    border-right: 1px dashed var(--secondary-color);
}

.site-header  .header-space {
    height: 55px;
    flex-grow: 2;
    border-bottom: 1px dashed var(--secondary-color);
}


#demo-header-content {
    transition-property: all;
    transition-duration: 400ms, 400ms;
    transition-timing-function: ease-out, ease-out;
    height: 150px;
    overflow: hidden;
}

#demo-header-content.closed {
    height: 0;
    opacity: 0;
    padding: 0;
    margin: 0;
}


@media only screen and (max-width: 1000px) {

    header nav a {
        display: none
    }

    .site-header {
        display: none;
    }
}