*, *::after, *::before{
    box-sizing: border-box;
}

:root{
    --cell-size: 100px;
    --mark-size: calc(var(--cell-size) * .9);
}

body{
    margin: 0;
    font-family: 'Bungee Inline', cursive;
}



.board{
    width: 100vw;
    height: 100vh;
    display: grid;
    justify-content: center;
    align-content: center;
    justify-items: center;
    align-items: center;
    grid-template-columns: repeat(3, auto);
}

.background{
    position: fixed;         /* Immer im Hintergrund */
    top: 0;
    left: 0;
    width: 100vw;            /* Ganze Bildschirmbreite */
    height: 100vh;           /* Ganze Bildschirmhoehe */
    background-image: url(assets/img/christmas-bauble-1079926_1920.jpg);
    background-size: cover;
    background-position: center;
    filter: blur(2px);       /* Unschaerfe */
    z-index: -1;             /* Hinter das Spielfeld */
}

.logo {
    position: fixed;
    top: 20px;          /* Abstand nach oben */
    right: 20px;        /* Abstand nach rechts */
    width: 120px;       /* Groesse anpassen */
    z-index: 10;        /* Ueber allem sichtbar */
}


.cell{
    width: var(--cell-size);
    height: var(--cell-size);
    border: 1px solid black;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
    cursor: pointer;
}

.cell:first-child,
.cell:nth-child(2),
.cell:nth-child(3){
    border-top: none;
}

.cell:nth-child(3n + 1){
    border-left: none;
}

.cell:nth-child(3n + 3){
    border-right: none;
}

.cell:last-child,
.cell:nth-child(8),
.cell:nth-child(7){
    border-bottom: none;
}

.cell.x,
.cell.circle{
    cursor: not-allowed;
}

.cell.x::before,
.cell.x::after,
.cell.circle::before{
    background-color: rgb(219, 74, 74);
}

.board.x .cell:not(.x):not(.circle):hover::before,
.board.x .cell:not(.x):not(.circle):hover::after,
.board.circle .cell:not(.x):not(.circle):hover::before{
    background-color: rgb(211, 211, 211);
} 

.cell.x::before,
.cell.x::after,
.board.x .cell:not(.x):not(.circle):hover::before,
.board.x .cell:not(.x):not(.circle):hover::after{
    content: '';
    position: absolute;
    width: calc(var(--mark-size) * .15);
    height: var(--mark-size);
}

.cell.x::before,
.board.x .cell:not(.x):not(.circle):hover::before{
    transform: rotate(45deg);
}

.cell.x::after,
.board.x .cell:not(.x):not(.circle):hover::after{
    transform: rotate(-45deg);
}

.cell.circle::before,
.cell.circle::after,
.board.circle .cell:not(.x):not(.circle):hover::before,
.board.circle .cell:not(.x):not(.circle):hover::after{
    content: '';
    position: absolute;
    border-radius: 50%;
}

.cell.circle::before,
.board.circle .cell:not(.x):not(.circle):hover::before{
    width: var(--mark-size);
    height: var(--mark-size);
}

.cell.circle::after,
.board.circle .cell:not(.x):not(.circle):hover::after{
    width: calc(var(--mark-size) * .7);
    height: calc(var(--mark-size) * .7);
    background-color: white;
}

.winning-message{
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, .9);
    justify-content: center;
    align-items: center;
    color: white;
    font-size: 5rem;
    flex-direction: column;
}

.winning-message button{
    font-size: 3rem;
    background-color: white;
    border: 1px solid black;
    padding: .25em .5em;
    cursor: pointer;
    border-radius: 10px;
}

.winning-message button:hover{
    background-color: black;
    color: white;
    border-color: white;
}

.winning-message.show{
    display: flex;
}