body       
{
    font-family: TeX Gyre Adventor, URW Gothic L, Avantgarde, sans-serif;
    margin: 0;
    padding: 0;
}

a
{
    color: #004488;
    text-decoration-line: none;
}

a:hover
{
    color: #0055AA;
    text-decoration-line: underline;
}

footer a
{
    color: #DDDDDD;
}

footer a:hover
{
    color: #FFFFFF;
}

.photo
{
    max-width: 100%;
    height: auto;
    margin-top: 10px;
    border-radius: 12px;
}

.icon
{
    height: 2em;
    padding: 5px;
}

#header
{
    background-color: #001122;
    color: white;
    position: relative;
}

#head-cont
{
    max-width: 1200px;
    margin: 0 auto;
}

#heading /* contains the logo */
{
    padding: 30px 0;
    text-align: center;
}

#heading img
{
    width: 250px;
}

.nav ul
{
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    justify-content: center;
}

.nav ul li
{
    text-align: center;
}

.nav ul li a 
{
    color: white;
    text-decoration: none;
    padding: 15px 20px;
    display: block;
    font-size: 1em;
}

.nav ul li a:hover 
{
    background-color: #002244;
}

#mobile-nav
{
    display: none; /* hides mobile navbar for desktop display */
    margin: 5px 15px;
}

@media screen and (max-width: 600px) /* for mobile devices HERE SET THE MAX WIDTH FOR COLLAPSE */
{ 
    .nav ul 
    {
        flex-direction: column;
    }

    .nav ul li 
    {
        margin: 5px 15px;
    }
    
    .nav ul li a
    {
        padding:10px 15px;
    }
    
    #desktop-nav
    {
        display: none; /* hides desktop navbar for mobile display */
    }
    
    #mobile-nav
    {
        display: block; /* shows mobile navbar for mobile devices */
    }
}

#menu
{
    padding: 10px 15px;
    margin: 5px 15px;
}

#menu:hover
{
    background-color: #002244;
    cursor: pointer;
}

#content
{
    max-width: 1500px;
    padding: 20px;
    margin: auto;
    font-size: 1em;
    line-height: 1.62em;
}

.centrum
{
    text-align: center;
}

.siatka
{
    margin:auto; 
}

.ref:hover
{
    text-decoration: none;
}

.kafel
{
    padding: 15px;
    border-radius: 12px; 
    margin: 0 auto 10px auto;
    background-color: #001122;
    color: white;
    max-width: 800px;
}

.kafel:hover
{
    background-color: #002244;
}

#foot-cont
{
    background-color: #001122;
    color: white;
}

footer
{
    margin: auto;
    padding: 20px;
    max-width: 1500px;
}