:root
{
    --grid-columns: 4;
    --grid-rows: 4;


    --header-height: 60px;
    --footer-height: 50px;
    --sidebar-width: clamp(150px, 27%, 700px);

    /* --background-lightness: 80%;
    --text-lightness: 100%;
     */

    --palette-header: #c8ccba;
    --palette-base: #abbb73;
    --palette-new-game: #eff5ef;
    --palette-sidebar: rgb(252, 250, 238);
    
    --grid_background_color:rgb(241, 241, 240);
    

    
    font-family: "Arial", sans-serif;
}

*{
    box-sizing: border-box;
}

body
{
    background: #f08;
    font-size: 16pt;
    text-align: center;
    position: absolute;
    margin: 0;
    height: 100%;
    width: 100%;
    overflow-x: hidden; /* disable horizontal scroll */
    overflow-y: hidden; /* disable vertical scroll */
}

header
{
    background: var(--palette-header);
    color:rgb(44, 62, 55);
    font-weight: bold;
    height: var(--header-height);
    position: absolute;
    text-align: center;
    width: 100%;
}

header h1
{
    font-size: 30pt;
    font-weight: bold;
    margin: 0;
    padding-top: 5px;
    text-align: center;
} 


aside
{
    background: var(--palette-sidebar);
    position: absolute;
    top: var(--header-height);
    width: var(--sidebar-width);
    height: calc(100% - var(--header-height) - var(--footer-height));

}

.score_container
{
    /* position: absolute; */
    /* top: var(--header-height); */
    width: 100%;
    text-align: center;
    font-size: 5vmin;
    color:rgb(44, 62, 55)
}

#new_game{
    /* position: relative; */
    background: var(--palette-base);
    border-radius: 5%;
    font-size: 3vmin;
    padding: 5px;
    color:white;
}

#introduction{
    font-size:2.5vmin;
    text-align: left;
    margin:3vmin;
    padding: 0;
    position: relative;
    color:rgb(44, 62, 55)
}

.sub_title{
    text-align: center;
    color:rgb(44, 62, 55);
    font-size:3vmin;
    font-weight: bold;
    margin:1vmin;
}

main
{
    background: var(--palette-sidebar);
    height: calc(100% - var(--header-height) - var(--footer-height));
    left: var(--sidebar-width);
    position: absolute;
    top: var(--header-height);
    width: calc(100% - var(--sidebar-width));
}

.grid
{   
    aspect-ratio: 1;
    margin-left: 0;
    margin-right: auto;
    padding:10px;
    position: relative;
    max-width: 100%;
    max-height: 100%;
    background: var(--grid_background_color);
}

.row
{
    height: calc(100%/var(--grid-rows));
    position: relative;
    padding: 0;
    margin: 0;
    width: 100%;
}
 
.cell
{
    background: hsl(150, 40%, var(--background-lightness));
    color: hsl(100, 50%, var(--text-lightness));
    /* color: hsl(200, 25%, 90%); */
    border: 1vmin solid rgba(41, 58, 51, 0.797);
    border-radius: 2vmin;
    font-size: 8vmin;
    display: inline-block;
    position: relative;
    height: 100%;
    width: calc(100% /var(--grid-columns));
    margin: 0;
    transition: 70ms ease-in-out;
    vertical-align: bottom; /*align the cell*/
    /* padding: 2vmin; */
    scale: 0.9;
    line-height :2;
}

footer
{
    background: var(--palette-base);
    bottom: 0px;
    height: var(--footer-height);
    position: absolute;
    width: 100%;
    color: white;
}

#mask_layer{
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
    background-color: rgba(0,0,0,0.5);
    display: none;
    z-index: 5;
}

#over{
    height: 50%;
    width: 70%;
    background-color: rgba(255, 255, 255, 0.9);
    border-radius: 15px;
    top: 50%;
    left: 50%;
    margin-top: -20%;
    margin-left: -35%;
    position: relative;
    text-align: center; 
    z-index : 10;
    display: none;
    padding: 8vmin;
    
}

#game_over{
    font-size: 6vmin;
    font-weight: bold;
    color:rgb(44, 62, 55);
    margin: 2vmin;
}

#restart
{
    background: var(--palette-base);
    border-radius: 5%;
    font-size: 3vmin;
    padding: 5px;
    color:white;
    margin:2vmin;
}