<div id="game-container" style="text-align: center; background: #222; padding: 20px; border-radius: 10px;">
<canvas id="snakeGame" width="400" height="400" style="border: 2px solid #555; background-color: #000;"></canvas>
<div style="color: white; font-family: 'Courier New', Courier, monospace; margin-top: 10px;">
        Score: <span id="scoreVal">0</span>
    </div>
</div>

<script>
    const canvas = document.getElementById("snakeGame");
    const ctx = canvas.getContext("2d");
    const scoreElement = document.getElementById("scoreVal");

    const box = 20; // Size of one pixel/grid square
    let score = 0;
    let snake = [{ x: 9 * box, y: 10 * box }];
    let food = {
        x: Math.floor(Math.random() * 19 + 1) * box,
        y: Math.floor(Math.random() * 19 + 1) * box
    };
    let d;

    document.addEventListener("keydown", direction);

    function direction(event) {
        if(event.keyCode == 37 && d != "RIGHT") d = "LEFT";
        else if(event.keyCode == 38 && d != "DOWN") d = "UP";
        else if(event.keyCode == 39 && d != "LEFT") d = "RIGHT";
        else if(event.keyCode == 40 && d != "UP") d = "DOWN";
    }

    function collision(head, array) {
        for(let i = 0; i < array.length; i++) {
            if(head.x == array[i].x && head.y == array[i].y) return true;
        }
        return false;
    }

    function draw() {
        ctx.fillStyle = "black";
        ctx.fillRect(0, 0, canvas.width, canvas.height);

        for(let i = 0; i < snake.length; i++) {
            ctx.fillStyle = (i === 0) ? "#00FF00":"#008000"; // Pixel Green
            ctx.fillRect(snake[i].x, snake[i].y, box, box);
            ctx.strokeStyle = "black";
            ctx.strokeRect(snake[i].x, snake[i].y, box, box);
        }

        ctx.fillStyle = "red";
        ctx.fillRect(food.x, food.y, box, box);

        let snakeX = snake[0].x;
        let snakeY = snake[0].y;

        if( d == "LEFT") snakeX -= box;
        if( d == "UP") snakeY -= box;
        if( d == "RIGHT") snakeX += box;
        if( d == "DOWN") snakeY += box;

        if(snakeX == food.x && snakeY == food.y) {
            score++;
            scoreElement.innerHTML = score;
            food = {
                x: Math.floor(Math.random() * 19 + 1) * box,
                y: Math.floor(Math.random() * 19 + 1) * box
            };
        } else {
            snake.pop();
        }

        let newHead = { x: snakeX, y: snakeY };

        if(snakeX < 0 || snakeX >= canvas.width || snakeY < 0 || snakeY >= canvas.height || collision(newHead, snake)) {
            clearInterval(game);
            alert("Game Over! Score: " + score);
            location.reload(); // Restarts the game
        }

        snake.unshift(newHead);
    }

    let game = setInterval(draw, 100); // Speed in milliseconds
</script>