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<div id="gomoku">
  <div id="message"></div>
  <div id="board"></div>
</div>

#gomoku {
  max-width: 500px;
  margin: 50px auto;
}
#board {
  display: grid;
  grid-template-columns: repeat(15, 1fr);
  gap: 1px;
  background-color: #333;
}
.cell {
  width: 30px;
  height: 30px;
  background-color: #f0d9b5;
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: 20px;
  cursor: pointer;
}
.cell.black::after {
  content: "●";
  color: black;
}
.cell.white::after {
  content: "○";
  color: white;
}

(function() {
  const size = 15;
  const board = [];
  let currentPlayer = 'black';

  const message = document.getElementById('message');
  const boardDiv = document.getElementById('board');

  function initBoard() {
    boardDiv.style.gridTemplateColumns = `repeat(${size}, 1fr)`;
    for (let i = 0; i < size * size; i++) {
      const cell = document.createElement('div');
      cell.classList.add('cell');
      cell.addEventListener('click', () => handlePlayerMove(i));
      boardDiv.appendChild(cell);
      board[i] = '';
    }
  }

  function handlePlayerMove(index) {
    if (board[index]) return;
    board[index] = 'black';
    updateBoard();
    if (!checkWin('black')) aiMove();
  }

  function aiMove() {
    const availableMoves = board.map((v, i) => v === '' ? i : -1).filter(i => i !== -1);
    const move = availableMoves[Math.floor(Math.random() * availableMoves.length)];
    board[move] = 'white';
    updateBoard();
    if (checkWin('white')) currentPlayer = 'none';
  }

  function updateBoard() {
    board.forEach((value, index) => {
      const cell = boardDiv.children[index];
      cell.classList.remove('black', 'white');
      if (value) cell.classList.add(value);
    });
  }

  function checkWin(player) {
    const inARow = 5;
    // Check horizontal, vertical, and diagonal lines
    for (let row = 0; row < size; row++) {
      for (let col = 0; col < size; col++) {
        if (
          checkLine(row, col, 1, 0, player) ||
          checkLine(row, col, 0, 1, player) ||
          checkLine(row, col, 1, 1, player) ||
          checkLine(row, col, 1, -1, player)
        ) {
          message.textContent = `${player.charAt(0).toUpperCase() + player.slice(1)} wins!`;
          return true;
        }
      }
    }
    return false;
  }

  function checkLine(row, col, dRow, dCol, player) {
    let count = 0;
    for (let i = 0; i < 5; i++) {
      const r = row + i * dRow;
      const c = col + i * dCol;
      if (r >= 0 && r < size && c >= 0 && c < size && board[r * size + c] === player) {
        count++;
      } else break;
    }
    return count === 5;
  }

  initBoard();
})();