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

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

body {
    margin: 0;
    background: radial-gradient(circle, rgba(239,176,69,1) 0%, rgba(246,161,82,1) 50%, rgba(255,98,98,1) 100%);
}

.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);
}

.cell {
    width: var(--cell-size);
    height: var(--cell-size);
    border: 1px solid rgb(0, 0, 0);
    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:first-child,
.cell:nth-child(4),
.cell:nth-child(7) {
    border-left: none;
}


.cell:nth-child(3),
.cell:nth-child(6),
.cell:nth-child(9) {
    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{
    background-color: #457662;
}

.cell.circle::before {
    
    background-color: #7e3a5dc9;
}



.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,
.board.circle .cell:not(.x):not(.circle):hover::after {
    background-color: #d7965e;
}



.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) * .1);
    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: #f2b44a;
}


.winning-message {
    display: none;
    font-family: 'Kosugi Maru', sans-serif;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(233, 189, 170, 0.9);
    justify-content: center;
    align-items: center;
    color: #2d1a57;
    font-size: 5rem;
    flex-direction: column;
}

.winning-message button {
    font-size: 4rem;
    border-radius: 10%;
    background-color: rgba(171, 124, 133, 0.748);
    font-family: 'Kosugi Maru', sans-serif;
    padding: 2rem;
    cursor: pointer;
    margin-top: 1.5rem;
}

.winning-message button:hover {
    font-size: 6rem;
    background-color: rgb(171, 124, 133);
    border-color: rgb(3, 3, 3);
    padding: .4em .5em;
    color: rgb(255, 255, 255);
}

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