#segment_header {
    z-index: 150;
    display: flex;
    flex-flow: row nowrap;
    justify-content: flex-start;
    position: fixed;
    top: 0;
    right: 0;
    left: 0;
    width: 100%;

    font-family: Roboto,sans-serif;
    font-weight: 300;

    background-color: var(--col-header-bg);
    box-shadow: 0 2px 5px 0 rgba(0,0,0,.16),0 2px 10px 0 rgba(0,0,0,.12);

    padding-top: 5px;
    padding-bottom: 5px;
}

#header_logo {
    font-size: 1.2rem;
    font-weight: bold;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 0 10px;
    user-select: none;
    text-decoration: none;
    
    color: var(--col-foreground);
}

#header_buttons {
    display: flex;
    flex: auto;
}

.header_btn {
    line-height: 1.5;
    color: var(--col-foreground);
    padding: .5rem 1rem;
    overflow: hidden;
    user-select: none;
    text-decoration: none;
    
    border: 1px solid var(--col-header-bg);
    
    margin-right: 0.1rem;
}

.header_btn:hover {
    background-color: var(--col-orange-light);
    border-bottom: 1px solid var(--col-orange-mid);
}

.header_split {
    flex: auto;
}

.header_btn.header_btn_active {

    border-bottom: 1px solid var(--col-orange-full);
}

@media only screen and (max-width: 45rem) {  /* 720px */

    #segment_header {
        position: static;
        flex-direction: column;
    }

    #header_logo {
        display: flex;
        align-items: center;
        justify-content: center;

        margin: 0.5rem;
        font-size: 1.5rem;
    }

    #header_buttons {
        flex-direction: column;
    }

    .header_split {
        display: none;
    }

    .header_btn {

    }
}