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

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

body {
	background: linear-gradient(to top right, #082c45, #26a9dc);
	font-family: sans-serif;
	min-height: 100vh;
	padding: 0;
	margin: 0;
}

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

.cell {
	border: 4px solid white;
	height: var(--cell-size);
	width: var(--cell-size);
	justify-content: center;
	align-items: center;
	position: relative;
	cursor: pointer;
	display: flex;
}

.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 {
	background-color: white;
}

.cell.circle::before,
.board.circle .cell:not(.x):not(.circle):hover::before {
	height: calc(var(--mark-size) * .85);
	width: calc(var(--mark-size) * .85);
	position: absolute;
	border-radius: 50%;
	content: '';
}

.cell.circle::before {
	border: calc(var(--mark-size) * .15) solid white;
}

.board.x .cell:not(.x):not(.circle):hover::before,
.board.x .cell:not(.x):not(.circle):hover::after {
	background-color: #90a2af;
}

.board.circle .cell:not(.x):not(.circle):hover::before {
	border: calc(var(--mark-size) * .15) solid #90a2af;
}

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

.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);
}

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

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

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

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

.players {
	justify-content: center;
	top: calc(50vh - 222px);
	align-items: center;
	position: absolute;
	display: flex;
	gap: 1rem;
	right: 0;
	left: 0;
}

.player {
	justify-content: center;
	align-items: flex-start;
	flex-direction: column;
	color: white;
	display: flex;
	gap: 0.25rem;
}

.player input {
	padding: 0.25rem 0.5rem;
	border-radius: 0.25rem;
	max-width: 9rem;
	height: 2rem;
	border: none;
}

.player input:focus {
	outline: none;
}