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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Flappy Bird</title>
    <style>
        body {
            margin: 0;
            overflow: hidden;
            background-color: #70c5ce;
        }
        canvas {
            display: block;
            margin: 0 auto;
        }
    </style>
</head>
<body>
    <canvas id="gameCanvas" width="320" height="480"></canvas>
    <script>
        const canvas = document.getElementById('gameCanvas');
        const ctx = canvas.getContext('2d');

        const bird = {
            x: 50,
            y: canvas.height / 2,
            width: 20,
            height: 20,
            gravity: 0.6,
            lift: -12,
            velocity: 0,
            draw() {
                ctx.fillStyle = 'yellow';
                ctx.fillRect(this.x, this.y, this.width, this.height);
            },
            update() {
                this.velocity += this.gravity;
                this.y += this.velocity;

                if (this.y + this.height > canvas.height) {
                    this.y = canvas.height - this.height;
                    this.velocity = 0;
                } else if (this.y < 0) {
                    this.y = 0;
                    this.velocity = 0;
                }
            },
            flap() {
                this.velocity = this.lift;
            }
        };

        const pipes = [];
        const pipeWidth = 40;
        const pipeGap = 100;
        const pipeSpeed = 2;
        let frame = 0;

        function drawPipes() {
            for (const pipe of pipes) {
                ctx.fillStyle = 'green';
                ctx.fillRect(pipe.x, 0, pipeWidth, pipe.top);
                ctx.fillRect(pipe.x, canvas.height - pipe.bottom, pipeWidth, pipe.bottom);
            }
        }

        function updatePipes() {
            if (frame % 60 === 0) {
                const top = Math.random() * (canvas.height / 2 - pipeGap) + 20;
                const bottom = canvas.height - top - pipeGap;
                pipes.push({ x: canvas.width, top, bottom });
            }

            for (let i = pipes.length - 1; i >= 0; i--) {
                pipes[i].x -= pipeSpeed;

                if (pipes[i].x + pipeWidth < 0) {
                    pipes.splice(i, 1);
                }
            }
        }

        function checkCollision() {
            for (const pipe of pipes) {
                if (bird.x + bird.width > pipe.x && bird.x < pipe.x + pipeWidth) {
                    if (bird.y < pipe.top || bird.y + bird.height > canvas.height - pipe.bottom) {
                        return true;
                    }
                }
            }
            return false;
        }

        function drawScore() {
            ctx.fillStyle = 'black';
            ctx.font = '20px Arial';
            ctx.fillText(`Score: ${Math.floor(frame / 60)}`, 10, 20);
        }

        function gameLoop() {
            ctx.clearRect(0, 0, canvas.width, canvas.height);
            bird.update();
            drawPipes();
            updatePipes();
            bird.draw();
            drawScore();

            if (checkCollision()) {
                alert('Game Over!');
                document.location.reload();
            }

            frame++;
            requestAnimationFrame(gameLoop);
        }

        document.addEventListener('keydown', (e) => {
            if (e.code === 'Space') {
                bird.flap();
            }
        });

        gameLoop();
    </script>
</body>
</html>
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