:root
{
    --inner_ring_radius: 0;
    --outer_ring_radius: 0;
}

#navigation_banner button
{
    background-color: transparent;
    cursor: pointer;

    padding: 0;
    margin: 0;
    border: 0;
}

#navigation_banner_container
{
    position: fixed;
    width: 100%;

    top: 100px;

    overflow: hidden;
    z-index: var(--navigation_banner_z-index);
}

#navigation_banner
{
    width: max(100%, 2000px);
}

.navigation_banner_content_background
{
    display: block;

    width: fit-content;
    height: fit-content;

    padding: 8px 12px 8px 0px;

    background-color: var(--UI_secondary_colour);
    clip-path: polygon(0% 0%, 100% 0%, calc(100% - 26px) 100%, 0% 100%);
    filter: drop-shadow(0px 0px 10px rgba(0,0,0,1));
}


#navigation_banner ul
{
    margin: 0px;
    padding: 0px;

    width: fit-content;
    height: var(--navigation_banner_height);

    overflow: hidden;

    list-style-type: none;

    filter: drop-shadow(0px 0px 10px rgba(0,0,0,1));
}

#navigation_banner li
{
    float: left;
}


li .navigation_banner_content
{
    position: relative;
    overflow: hidden;
    
    padding: 5px 6px;
    margin-left: 8px;
    background-color: var(--UI_primary_colour);
    height: calc(var(--navigation_banner_height) - 10px);

    text-decoration: none;
}

li:first-child .navigation_banner_content { margin-left: 0px; }


#navigation_banner a:hover, #navigation_banner a:visited, #navigation_banner a:link, #navigation_banner a:active
{
    text-decoration: none;
}

#navigation_banner button:hover, #navigation_banner  button:visited, #navigation_banner button:link, #navigation_banner button:active
{
    text-decoration: none;
}

.navigation_banner_content h1
{
    pointer-events: none;

    position: relative;
    display: inline;

    color: var(--navigation_banner_colour);
    font-family: var(--navigation_banner_font);
    font-size: var(--navigation_banner_font_size);

    white-space: nowrap;
    padding: 0px 1vw;
    margin: 0px 0px;

    text-shadow: 3px 3px black;
}



li .navigation_banner_content:hover
{
    background-image: radial-gradient(circle, var(--UI_hightlight_primary_colour) var(--inner_ring_radius), var(--UI_hightlight_secondary_colour) var(--outer_ring_radius), var(--UI_hightlight_primary_colour) 85%, black 125%);
    box-shadow: 0px 0px 5px var(--UI_primary_colour) inset;
}






li:last-child .navigation_banner_content
{
    pointer-events: bounding-box;
    padding: 5px 22px 5px 10px;
    margin-left: 8px;
    background-color: var(--UI_primary_colour);
    background-position: -5px 0;
    height: calc(var(--navigation_banner_height) - 10px);
    clip-path: polygon(0% 0%, 100% 0%, calc(100% - 20px) 100%, 0% 100%);

    text-decoration: none;
}


#navigation_banner li:last-child .navigation_banner_content:hover:before
{
    position: relative;
    display: block;
    z-index: calc(var(--navigation_banner_z-index) - 1);

    color: red;

    left: 0px;
    width: calc(100%);
    height: 20px;
    top: calc(5px - var(--navigation_banner_height));

    border-top: calc(var(--navigation_banner_height)) solid black;
    border-right: 15px solid transparent;

    box-shadow: 0px 0px 5px var(--UI_primary_colour) inset;
    background-clip: border-box;
    background-image: radial-gradient(circle, seagreen var(--inner_ring_radius), mediumseagreen var(--outer_ring_radius), seagreen 85%, black 125%);
}

#dropdown
{
    position: fixed;
    display: block;
    z-index: var(--navigation_dropdown_z-index);
    background-color: transparent;

    flex-direction: column; /* forces vertical stacking */
    transform: translateY(calc(-1 * var(--navigation_dropdown_height)));
    pointer-events: none;

    transition: opacity 0.25s ease, transform 0.25s ease;
}

#dropdown.open
{
    display: block;
    transform: translateY(0);
    pointer-events: auto;
}

#dropdown button 
{
    position: relative;
    display: block;
    width: 100%;
    padding: 5px 15px 5px 15px;

    cursor: pointer;

    background-color: var(--UI_primary_colour);
    color: var(--navigation_dropdown_colour);
    font-family: var(--navigation_dropdown_font);
    font-size: var(--navigation_dropdown_font_size);

    border: 6px solid black;
    text-shadow: 3px 3px black;
    text-align: left;

    filter: drop-shadow(0px 0px 10px rgba(0,0,0,1));
    z-index: var(--navigation_dropdown_z-index);
}

#dropdown button .dropdown_element_background
{
    position: absolute; /* ignores parent content flow */
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;

    background-image: url('/Data/Images/Backgrounds/Rock 2.png');
    background-size: cover;

    pointer-events: none;
    z-index: var(--navigation_dropdown_z-index);
}

#dropdown button h1
{
    position: relative; /* enables z-index */
    z-index: calc(var(--navigation_dropdown_z-index) + 1);
    font-size: var(--navigation_dropdown_font_size);

    margin: 0;
    padding: 0;
}

#dropdown button:hover
{
    background-image: radial-gradient(circle, var(--UI_hightlight_primary_colour) var(--inner_ring_radius), var(--UI_hightlight_secondary_colour) var(--outer_ring_radius), var(--UI_hightlight_primary_colour) 85%, black 125%);
    box-shadow: 0px 0px 5px var(--UI_primary_colour) inset
}

.submenu {
    display: none;
    margin-left: 20px;
    border-left: 2px solid rgba(255,255,255,0.2);
    padding-left: 10px;
}

.submenu.open {
    display: block;
}

.dropdown_item.has-children h1::after {
    content: "▶";
    float: right;
    opacity: 0.7;
}

.dropdown_item.has-children.open h1::after {
    content: "▼";
}