/**** 
* Plugins
****/ 
var tween = LK.import("@upit/tween.v1");

/**** 
* Classes
****/ 
// Bird class
var Bird = Container.expand(function () {
	var self = Container.call(this);
	var birdSprite = self.attachAsset('bird', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.radius = birdSprite.width * 0.5;
	self.vy = 0; // vertical velocity
	// Bird physics constants
	self.gravity = 1.2; // px per frame^2 (slower fall)
	self.jumpStrength = -24; // px per frame (less abrupt jump)
	// Bird update
	self.update = function () {
		self.vy += self.gravity;
		self.y += self.vy;
		// Clamp rotation for visual feedback
		var maxAngle = Math.PI / 4;
		var minAngle = -Math.PI / 3;
		var targetAngle = Math.max(minAngle, Math.min(maxAngle, self.vy / 40));
		birdSprite.rotation = targetAngle;
	};
	// Bird jump
	self.flap = function () {
		self.vy = self.jumpStrength;
	};
	return self;
});
// PipePair class
var PipePair = Container.expand(function () {
	var self = Container.call(this);
	// Pipe constants
	self.pipeWidth = 220;
	self.gapHeight = 600;
	self.speed = 8; // px per frame (slower pipes)
	// Randomize gap position
	var minGapY = 300;
	var maxGapY = 2732 - 300 - self.gapHeight - 120; // leave space for ground
	self.gapY = minGapY + Math.floor(Math.random() * (maxGapY - minGapY + 1));
	// Top pipe: height is from top to gapY
	self.topPipe = self.attachAsset('pipe', {
		anchorX: 0.5,
		anchorY: 1.0,
		x: 0,
		y: self.gapY,
		height: self.gapY // fill from top to gap
	});
	// Bottom pipe: height is from gapY+gapHeight to bottom
	self.bottomPipe = self.attachAsset('pipe', {
		anchorX: 0.5,
		anchorY: 0.0,
		x: 0,
		y: self.gapY + self.gapHeight,
		height: 2732 - (self.gapY + self.gapHeight) // fill from gap to bottom
	});
	// For scoring
	self.passed = false;
	// Update
	self.update = function () {
		self.x -= self.speed;
	};
	// Helper for collision
	self.getTopRect = function () {
		return new Rectangle(self.x - self.pipeWidth / 2, 0, self.pipeWidth, self.gapY);
	};
	self.getBottomRect = function () {
		return new Rectangle(self.x - self.pipeWidth / 2, self.gapY + self.gapHeight, self.pipeWidth, 2732 - (self.gapY + self.gapHeight));
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x87ceeb // sky blue
});

/**** 
* Game Code
****/ 
// Ground: brown box
// Pipe: green box
// Bird: yellow ellipse
// Game constants
var BIRD_START_X = 600;
var BIRD_START_Y = 1366;
var PIPE_INTERVAL = 110; // frames between pipes (slower, matches pipe speed)
var GROUND_HEIGHT = 260;
var GROUND_Y = 2732 - GROUND_HEIGHT; // ground top y
// Game state
var bird;
var pipes = [];
var ground;
var score = 0;
var scoreTxt;
var started = false;
var gameOver = false;
var lastPipeTick = 0;
// GUI score
scoreTxt = new Text2('0', {
	size: 160,
	fill: 0xFFFFFF
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
// Ground
ground = LK.getAsset('ground', {
	anchorX: 0,
	anchorY: 0,
	x: 0,
	y: GROUND_Y
});
game.addChild(ground);
// Bird
bird = new Bird();
bird.x = BIRD_START_X;
bird.y = BIRD_START_Y;
game.addChild(bird);
// Reset function
function resetGame() {
	// Remove pipes
	for (var i = 0; i < pipes.length; i++) {
		pipes[i].destroy();
	}
	pipes = [];
	// Reset bird
	bird.x = BIRD_START_X;
	bird.y = BIRD_START_Y;
	bird.vy = 0;
	// Reset score
	score = 0;
	scoreTxt.setText(score);
	started = false;
	gameOver = false;
	lastPipeTick = LK.ticks;
}
// Start game on first tap
game.down = function (x, y, obj) {
	if (gameOver) return;
	if (!started) {
		started = true;
		bird.flap();
		return;
	}
	bird.flap();
};
// Main update loop
game.update = function () {
	if (gameOver) return;
	if (!started) {
		// Idle bird bobbing
		bird.y = BIRD_START_Y + Math.sin(LK.ticks / 20) * 30;
		return;
	}
	// Bird physics
	bird.update();
	// Clamp bird to top of screen
	if (bird.y < bird.radius) {
		bird.y = bird.radius;
		bird.vy = 0;
	}
	// Add pipes
	if (LK.ticks - lastPipeTick >= PIPE_INTERVAL) {
		var pipePair = new PipePair();
		pipePair.x = 2048 + pipePair.pipeWidth / 2;
		game.addChild(pipePair);
		pipes.push(pipePair);
		lastPipeTick = LK.ticks;
	}
	// Update pipes, check for offscreen and scoring
	for (var i = pipes.length - 1; i >= 0; i--) {
		var pipe = pipes[i];
		pipe.update();
		// Remove offscreen pipes
		if (pipe.x < -pipe.pipeWidth / 2) {
			pipe.destroy();
			pipes.splice(i, 1);
			continue;
		}
		// Scoring: passed center of bird
		if (!pipe.passed && pipe.x + pipe.pipeWidth / 2 < bird.x - bird.radius) {
			pipe.passed = true;
			score += 1;
			scoreTxt.setText(score);
		}
	}
	// Collision detection
	// Bird rectangle
	var birdRect = new Rectangle(bird.x - bird.radius * 0.8, bird.y - bird.radius * 0.8, bird.radius * 1.6, bird.radius * 1.6);
	// Check collision with pipes
	for (var j = 0; j < pipes.length; j++) {
		var pipe = pipes[j];
		var topRect = pipe.getTopRect();
		var bottomRect = pipe.getBottomRect();
		if (rectsIntersect(birdRect, topRect) || rectsIntersect(birdRect, bottomRect)) {
			triggerGameOver();
			return;
		}
	}
	// Check collision with ground
	if (bird.y + bird.radius > GROUND_Y + GROUND_HEIGHT) {
		// Bird is below ground, clamp to ground, but do not die
		bird.y = GROUND_Y + GROUND_HEIGHT - bird.radius;
		bird.vy = 0;
	}
	// Check if bird goes above the sky (top of screen)
	if (bird.y - bird.radius < 0) {
		bird.y = bird.radius;
		triggerGameOver();
		return;
	}
};
// Rectangle intersection helper
function rectsIntersect(r1, r2) {
	return !(r2.x > r1.x + r1.width || r2.x + r2.width < r1.x || r2.y > r1.y + r1.height || r2.y + r2.height < r1.y);
}
// Game over
function triggerGameOver() {
	if (gameOver) return;
	gameOver = true;
	// Flash red
	LK.effects.flashScreen(0xff0000, 800);
	// Show game over popup (handled by LK)
	LK.showGameOver();
}
// Reset on game over
LK.on('gameover', function () {
	resetGame();
});
// Initial reset
resetGame();

===================================================================
--- original.js
+++ change.js
@@ -93,10 +93,10 @@
 // Game constants
 var BIRD_START_X = 600;
 var BIRD_START_Y = 1366;
 var PIPE_INTERVAL = 110; // frames between pipes (slower, matches pipe speed)
-var GROUND_Y = 2732 - 60; // ground top y
-var GROUND_HEIGHT = 120;
+var GROUND_HEIGHT = 260;
+var GROUND_Y = 2732 - GROUND_HEIGHT; // ground top y
 // Game state
 var bird;
 var pipes = [];
 var ground;
@@ -206,10 +206,16 @@
 			return;
 		}
 	}
 	// Check collision with ground
-	if (bird.y + bird.radius > GROUND_Y) {
-		bird.y = GROUND_Y - bird.radius;
+	if (bird.y + bird.radius > GROUND_Y + GROUND_HEIGHT) {
+		// Bird is below ground, clamp to ground, but do not die
+		bird.y = GROUND_Y + GROUND_HEIGHT - bird.radius;
+		bird.vy = 0;
+	}
+	// Check if bird goes above the sky (top of screen)
+	if (bird.y - bird.radius < 0) {
+		bird.y = bird.radius;
 		triggerGameOver();
 		return;
 	}
 };