*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Courier New', Courier, monospace;
}

:root{
    --cellSize: 100px;
    --markSize: calc(var(--cellSize) * 0.8);
    --mainColor: rgb(73, 236, 209);
    --bgColor: #333;
    --markColorX: #000;
    --markColorCircle: #fff;
    --markHover: #444;
}

body{
    background: var(--bgColor);
}

.container{
    display: flex;
    flex-direction: column;
    gap: 2rem 0;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
}
.container .title h1{
    font-size: 2rem;
    color: #fff;
    letter-spacing: 2px;
}
.container .title h1 span{
    color: var(--mainColor);
}
.container .title .me{
    color: #fff;
    float: right;
    margin-top: 0.5rem;
}
.gameBoard{
    display: grid;
    justify-content: center;
    align-items: center;
    grid-template-columns: repeat(3, auto);
    box-shadow: 0 35px 50px rgba(0, 0, 0, 0.3);
}
.cell{
    position: relative;
    width: var(--cellSize);
    height: var(--cellSize);
    background-color: var(--mainColor);
    border: 1px solid #333;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
}

/*********
MARKING X||O
**********/

.cell.x::before,
.cell.x::after{
    background: var(--markColorX);
}
.gameBoard.x .cell:not(.x):not(.circle):hover::before,
.gameBoard.x .cell:not(.x):not(.circle):hover::after,
.gameBoard.circle .cell:not(.x):not(.circle):hover::before,
.gameBoard.circle .cell:not(.x):not(.circle):hover::after{
    background: var(--markHover);
}
.cell.x::before,
.cell.x::after,
.gameBoard.x .cell:not(.x):not(.circle):hover::before,
.gameBoard.x .cell:not(.x):not(.circle):hover::after{
    content: '';
    position: absolute;
    width: calc(var(--markSize) * 0.15);
    height: var(--markSize);
    transition: 0.5s linear;
}
.cell.x::before,
.gameBoard.x .cell:not(.x):not(.circle):hover::before{
    transform: rotate(45deg);
}
.cell.x::after,
.gameBoard.x .cell:not(.x):not(.circle):hover::after{
    transform: rotate(-45deg);
}
.cell.circle::before,
.cell.circle::after{
    background: var(--markColorCircle);
}
.gameBoard.circle .cell:not(.x):not(.circle):hover::before,
.gameBoard.circle .cell:not(.x):not(.circle):hover::after,
.cell.circle::before,
.cell.circle::after{
    content: '';
    position: absolute;
    width: var(--markSize);
    height: var(--markSize);
    border-radius: 50%;
}
.gameBoard.circle .cell:not(.x):not(.circle):hover::after,
.cell.circle::after{
    width: calc(var(--markSize) * 0.7);
    height: calc(var(--markSize) * 0.7);
    background: var(--mainColor);
}

/**********
win Message
***********/
.winMsgBox{
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    flex-direction: column;
    gap: 1rem 0;
    justify-content: center;
    align-items: center;
    text-align: center;
    height: 100vh;
    background: rgba(0,0,0,0.3);
    font-size: 3rem;
    color: #ffffff;
    text-shadow: 0 5px 10px rgba(0,0,0,0.5);
}
.winMsgBox button{
    padding: 0.5rem 2rem;
    font-size: 1.25rem;
    background: VAR(--mainColor);
    color: #fff;
    border: 1px solid transparent;
    letter-spacing: 1px;
    transition: 0.5s ease-in-out;
}
.winMsgBox button:hover{
    background: #000;
    color: var(--mainColor);
    border-color: var(--mainColor);
}
.winMsgBox.show{
    display: flex;
}

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



@media screen and (max-width: 500px) {
    .gameBoard{
        padding: auto 1rem;
    }
}
@media screen and (max-width: 350px) {
    .container .title h1{
        font-size: 1.85rem;
    }
    .winMsgBox{
        padding: 0 1rem;
        font-size: 2.2rem;
    }
}