@import url('https://fonts.googleapis.com/css2?family=Roboto&display=swap');

*,*:after,*:before{
    box-sizing: border-box;
}
:root{
--cell-size:100px;
--mark-size:calc(var(--cell-size)*0.9);
}
body{
    margin:0;
    padding:0;
    background-color: rgb(110, 204, 192);
}
.main{
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    width:100vw;
    height:80vh;
    background-color: rgb(110, 204, 192);

}
.main h1{
    font-size: 64px;
    color:rgb(248, 161, 0);
    text-shadow: 3px 3px 5px #fff;
}
.main h1:hover{
    cursor: default;
}

.main-link{
    display:inline-block;
    padding:0.35em 1.2em;
    border:0.1em solid #FFFFFF;
    margin:0 0.3em 0.3em 0;
    border-radius:0.12em;
    box-sizing: border-box;
    text-decoration:none;
    font-family:'Roboto',sans-serif;
    font-weight:300;
    color:#FFFFFF;
    font-size: 30px;
    text-align:center;
    transition: all 0.2s;
    margin:20px;
    }
.main-link:hover{
    color:#000000;
    background-color:#FFFFFF;
    }
.board{
    width:100vw;
    height:80vh;
    display: grid;
    justify-content: center;
    align-content: center;
    justify-items: center;
    align-items: center;
    grid-template-columns: repeat(3,auto);
}
.cell{
    width:var(--cell-size);
    height:var(--cell-size);
    position: relative;
    border: 1px solid black;
    background-color: rgb(110, 204, 192);
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
}
.cell.x,.cell.circle:hover{
    cursor:not-allowed;
}
.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(7),.cell:nth-child(8){
    border-bottom: none;
}
.cell.x::before,
.cell.x::after,
.board.x .cell:not(.circle):not(.x):hover::before,
.board.x .cell:not(.circle):not(.x):hover::after{
    content: "";
    position: absolute;
    width:calc(var(--mark-size)*.15);
    height: var(--mark-size);
    background-color: black;
}
.board.x .cell:not(.circle):not(.x):hover::before,
.board.x .cell:not(.circle):not(.x):hover::after{
    background-color: rgba(255, 255, 255, 0.8);
}
.cell.x:before,.board.x .cell:not(.circle):not(.x):hover::before{
    transform: rotate(45deg);
}
.cell.x:after,.board.x .cell:not(.circle):not(.x):hover::after{
    transform: rotate(-45deg);
}
.cell.circle::before,.cell.circle::after,
.board.circle .cell:not(.circle):not(.x):hover::before,
.board.circle .cell:not(.circle):not(.x):hover::after{
    content: "";
    position: absolute;
    border-radius: 50%;
    background-color: black;
}
.board.circle .cell:not(.circle):not(.x):hover::before,
.board.circle .cell:not(.circle):not(.x):hover::after{
    background-color: rgba(255, 255, 255, 0.8);
}
.cell.circle::before,.board.circle .cell:not(.circle):not(.x):hover::before{
    width:calc(var(--mark-size));
    height: calc(var(--mark-size));
}
.cell.circle::after,.board.circle .cell:not(.circle):not(.x):hover::after{
    width:calc(var(--mark-size)*0.7);
    height:calc(var(--mark-size)*0.7);
    background-color: rgb(110, 204, 192);
}
.winning-message{
    display: none;
    position: fixed;  
    top:0;
    left:0;
    right:0;
    bottom: 0;
    background-color:rgba(0,0,0,0.8);
    justify-content: center;
    align-items: center;
    color:#fff;
    font-size:5rem;
    flex-direction: column;
}
#restartButton{
    
    font-size: 3rem;
    padding:.25em .5em;
    background-color: #fff;
    border: 1px solid black;
    cursor: pointer;
    outline: none;
}
#restartButton:hover{
    background-color: #000;
    color:white;
    border: 1px solid white;
}
.show{
    display: flex;
}