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HTML

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Andev Web</title>
    <link rel="stylesheet" href="style.css">
</head>
<body>

<main>
        <header id="header">
            <div class="player player-active"
            id="xPlayerDisplay"
            onclick="choosePlayer('X')">
            X
            </div>
            <h3 id="titleHeader">Choose</h3>
            <div class="player"
            id="oPlayerDisplay"
            onclick="choosePlayer('O')">
            O
            </div>
        </header>

<button id="restartBtn">
            Restart
        </button>
    </main>

CSS

@import url('https://fonts.googleapis.com/css2?family=Poppins:ital,wght@0,100;0,200;0,300;0,400;0,500;0,600;0,700;0,800;0,900;1,100;1,200;1,300;1,400;1,500;1,600;1,700;1,800;1,900&display=swap');

* {
    margin: 0;
    box-sizing: border-box;
    font-family: 'Poppins', sans-serif;
    user-select: none;
    
    color: white;
}

main {
    background: #0A0519;
    height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

#header {
    display: flex;
    width: 235px;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
}
#header .player {
    background: #17122A;
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 30px;
    font-weight: bold;
    cursor: pointer;
    border-radius: 12px;
    border: solid 4px #17122A;
    opacity: 0.5;
    transition: 0.3s;
}
#header .player:hover {
    border: solid 4px #2A2343;
}
#header .player-active {
    opacity: 1;
    border: solid 4px #2A2343;
}
#header #xPlayerDisplay {
    color: #1892EA;
}
#header #oPlayerDisplay {
    color: #A737FF;
}

#board {
    display: grid;
    grid-template-columns: repeat(3, 70px);
    grid-template-rows: repeat(3, 70px);
    gap: 12px;
}
#board .cell {
    background: #17122A;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 36px;
    font-weight: bold;
    cursor: pointer;
    transition: 0.3s background;
}
#board .cell:hover {
    background: #2A2343;
}

#restartBtn {
    margin-top: 30px;
    width: 235px;
    background: #17122A;
    padding-top: 8px;
    padding-bottom: 8px;
    border: none;
    border-radius: 12px;
    font-weight: 600;
    font-size: 16px;
    cursor: pointer;
    transition: 0.3s background;
    visibility: hidden;
}
#restartBtn:hover {
    background: #2A2343;
}

const cells = document.querySelectorAll('.cell')
const titleHeader = document.querySelector('#titleHeader')
const xPlayerDisplay = document.querySelector('#xPlayerDisplay')
const oPlayerDisplay = document.querySelector('#oPlayerDisplay')
const restartBtn = document.querySelector('#restartBtn')

// Initialize variables for the game
let player = 'X'
let isPauseGame = false
let isGameStart = false

// Array of win conditions
const inputCells = ['', '', '',
                    '', '', '',
                    '', '', '']

// Array of win conditions
const winConditions = [
    [0, 1, 2], [3, 4, 5], [6, 7, 8], // Rows
    [0, 3, 6], [1, 4, 7], [2, 5, 8], // Columns
    [0, 4, 8], [2, 4, 6] // Diagonals
]

// Add click event listeners to each cell
cells.forEach((cell, index) => {
    cell.addEventListener('click', () => tapCell(cell, index))
})

function tapCell(cell, index) {
    // Ensure cell is empty and game isn't paused
    if (cell.textContent == '' &&
        !isPauseGame
    ) {
        isGameStart = true
        updateCell(cell, index)

// Do a random pick if there are no results
        if (!checkWinner()) {
            changePlayer()
            randomPick()
        }
    }
}

function updateCell(cell, index) {
    cell.textContent = player
    inputCells[index] = player
    cell.style.color = (player == 'X') ? '#1892EA' : '#A737FF'
}

function changePlayer() {
    player = (player == 'X') ? 'O' : 'X'
}

function randomPick() {
    // Pause the game to allow Computer to pick
    isPauseGame = true

setTimeout(() => {
        let randomIndex
        do {
            // Pick a random index
            randomIndex = Math.floor(Math.random() * inputCells.length)
        } while (
            // Ensure the chosen cell is empty
            inputCells[randomIndex] != ''
        )

// Update the cell with Computer move
        updateCell(cells[randomIndex], randomIndex, player)
        // Check if Computer not won
        if (!checkWinner()) {
            changePlayer()
            // Swith back to Human player
            isPauseGame = false
            return
        }
        player = (player == 'X') ? 'O' : 'X'
    }, 1000) // Delay Computer move by 1 second
}

function checkWinner() {
    for (const [a, b, c] of winConditions) {
        // Check each winning condition
        if (inputCells[a] == player &&
            inputCells[b] == player &&
            inputCells[c] == player
        ) {
            declareWinner([a, b, c])
            return true
        }
    }
    
    // Check for a draw (if all cells are filled)
    if (inputCells.every(cell => cell != '')) {
        declareDraw()
        return true
    }
}

function declareWinner(winningIndices) {
    titleHeader.textContent = `${player} Win`
    isPauseGame = true

// Highlight winning cells
    winningIndices.forEach((index) =>
        cells[index].style.background = '#2A2343'
    )

restartBtn.style.visibility = 'visible'
}

function declareDraw() {
    titleHeader.textContent = 'Draw!'
    isPauseGame = true
    restartBtn.style.visibility = 'visible'
}

function choosePlayer(selectedPlayer) {
    // Ensure the game hasn't started
    if (!isGameStart) {
        // Override the selected player value
        player = selectedPlayer
        if (player == 'X') {
            // Hightlight X display
            xPlayerDisplay.classList.add('player-active')
            oPlayerDisplay.classList.remove('player-active')
        } else {
            // Hightlight O display
            xPlayerDisplay.classList.remove('player-active')
            oPlayerDisplay.classList.add('player-active')
        }
    }
}

restartBtn.addEventListener('click', () => {
    restartBtn.style.visibility = 'hidden'
    inputCells.fill('')
    cells.forEach(cell => {
        cell.textContent = ''
        cell.style.background = ''
    })
    isPauseGame = false
    isGameStart = false
    titleHeader.textContent = 'Choose'
})