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

/**** 
* Classes
****/ 
// Distraction Icon (obstacle)
var DistractionIcon = Container.expand(function () {
	var self = Container.call(this);
	var icon = self.attachAsset('distraction_icon', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.type = 'distraction';
	self.lane = 1;
	self.speed = 16; // Will be set by game, but default here
	return self;
});
// Productivity Icon (collectible)
var ProdIcon = Container.expand(function () {
	var self = Container.call(this);
	var icon = self.attachAsset('prod_icon', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.type = 'prod';
	self.lane = 1;
	self.speed = 16; // Will be set by game, but default here
	return self;
});
// Runner class
var Runner = Container.expand(function () {
	var self = Container.call(this);
	var runnerSprite = self.attachAsset('runner', {
		anchorX: 0.5,
		anchorY: 1
	});
	self.lane = 1; // Start in center lane (0: left, 1: center, 2: right)
	self.y = 2200; // Near bottom of screen
	// Move to lane with tween
	self.moveToLane = function (targetLane) {
		if (targetLane < 0 || targetLane >= laneCount) return;
		self.lane = targetLane;
		tween(self, {
			x: laneX[targetLane]
		}, {
			duration: 120,
			easing: tween.cubicOut
		});
	};
	// Set initial position
	self.x = laneX[self.lane];
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x000000
});

/**** 
* Game Code
****/ 
// Lane positions (global, so all classes can access)
// Runner character
// Distraction icons (obstacles)
// Productivity icons (collectibles)
// Score display
var laneCount = 3;
var laneX = [2048 / 2 - 300,
// Left lane
2048 / 2,
// Center lane
2048 / 2 + 300 // Right lane
];
var scoreTxt = new Text2('0', {
	size: 120,
	fill: 0xFFFFFF
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
// Game variables
var runner;
var objects = []; // All collectibles and obstacles
var spawnTimer = 0;
var spawnInterval = 60; // Frames between spawns (will decrease)
var objectSpeed = 16; // Initial speed (will increase)
var minSpawnInterval = 24;
var maxObjectSpeed = 38;
var score = 0;
var lastMoveX = null;
var lastMoveY = null;
var dragStartX = null;
var dragStartY = null;
var dragActive = false;
// Initialize runner
runner = new Runner();
game.addChild(runner);
// Helper: spawn a new object (randomly prod or distraction)
function spawnObject() {
	// Randomly choose lane (0, 1, or 2)
	var lane = Math.floor(Math.random() * laneCount);
	// Randomly choose type (60% prod, 40% distraction)
	var isProd = Math.random() < 0.6;
	var obj;
	if (isProd) {
		obj = new ProdIcon();
	} else {
		obj = new DistractionIcon();
	}
	// Ensure object spawns only in a lane, never between lanes
	obj.lane = lane;
	obj.x = laneX[lane];
	obj.y = -100; // Start just above screen
	// For distraction (obstacle), randomly assign a higher speed to some for reflex challenge
	if (obj.type === 'distraction' && Math.random() < 0.4) {
		// 40% of obstacles are fast (reflex test)
		obj.speed = objectSpeed + 10 + Math.floor(Math.random() * 6); // +10~+15 px/frame
	} else {
		obj.speed = objectSpeed;
	}
	// Track lastY and lastWasIntersecting for event detection
	obj.lastY = obj.y;
	obj.lastWasIntersecting = false;
	objects.push(obj);
	game.addChild(obj);
}
// Touch/drag/swipe controls
game.down = function (x, y, obj) {
	dragStartX = x;
	dragStartY = y;
	dragActive = true;
	lastMoveX = x;
	lastMoveY = y;
};
game.move = function (x, y, obj) {
	if (!dragActive) return;
	var dx = x - dragStartX;
	var dy = y - dragStartY;
	// Only consider horizontal swipes
	if (Math.abs(dx) > 80 && Math.abs(dx) > Math.abs(dy)) {
		if (dx > 0 && runner.lane < laneCount - 1) {
			runner.moveToLane(runner.lane + 1);
			dragActive = false;
		} else if (dx < 0 && runner.lane > 0) {
			runner.moveToLane(runner.lane - 1);
			dragActive = false;
		}
	}
	lastMoveX = x;
	lastMoveY = y;
};
game.up = function (x, y, obj) {
	// If tap (not swipe), move to lane based on tap position
	if (dragActive && Math.abs(x - dragStartX) < 40 && Math.abs(y - dragStartY) < 40) {
		// Tap: move to nearest lane
		var tapLane = 0;
		var minDist = Math.abs(x - laneX[0]);
		for (var i = 1; i < laneCount; i++) {
			var d = Math.abs(x - laneX[i]);
			if (d < minDist) {
				minDist = d;
				tapLane = i;
			}
		}
		runner.moveToLane(tapLane);
	}
	dragActive = false;
	dragStartX = null;
	dragStartY = null;
};
// Main game loop
game.update = function () {
	// Increase difficulty over time
	if (LK.ticks % 180 == 0) {
		// Every 3 seconds
		if (spawnInterval > minSpawnInterval) spawnInterval -= 2;
		if (objectSpeed < maxObjectSpeed) objectSpeed += 1;
	}
	// Spawn objects
	spawnTimer++;
	if (spawnTimer >= spawnInterval) {
		spawnObject();
		spawnTimer = 0;
	}
	// Move objects and check collisions
	for (var i = objects.length - 1; i >= 0; i--) {
		var obj = objects[i];
		obj.y += obj.speed;
		// Remove if off screen (use lastY for transition detection)
		if (obj.lastY <= 2800 && obj.y > 2800) {
			obj.destroy();
			objects.splice(i, 1);
			continue;
		}
		// Collision with runner (use lastWasIntersecting for precise event)
		// Only check for collision if in the same lane and vertical overlap
		var isIntersecting = obj.lane === runner.lane && Math.abs(obj.y - runner.y + 40) < 120;
		if (!obj.lastWasIntersecting && isIntersecting) {
			if (obj.type === 'prod') {
				// Collect
				score += 1;
				LK.setScore(score);
				scoreTxt.setText(LK.getScore());
				LK.effects.flashObject(runner, 0x4caf50, 200);
				obj.destroy();
				objects.splice(i, 1);
			} else if (obj.type === 'distraction') {
				// Hit distraction: game over
				LK.effects.flashScreen(0xf44336, 800);
				LK.showGameOver();
				return;
			}
		}
		// Update lastY and lastWasIntersecting for next frame
		obj.lastY = obj.y;
		obj.lastWasIntersecting = isIntersecting;
	}
};
// Center runner vertically (bottom 1/5th of screen)
runner.y = 2732 - 350;
// Initial score
score = 0;
LK.setScore(score);
scoreTxt.setText(LK.getScore());
// Play background music at game start
LK.playMusic('Mozart');

===================================================================
--- original.js
+++ change.js
@@ -64,13 +64,13 @@
 
 /**** 
 * Game Code
 ****/ 
-// Score display
-// Productivity icons (collectibles)
-// Distraction icons (obstacles)
-// Runner character
 // Lane positions (global, so all classes can access)
+// Runner character
+// Distraction icons (obstacles)
+// Productivity icons (collectibles)
+// Score display
 var laneCount = 3;
 var laneX = [2048 / 2 - 300,
 // Left lane
 2048 / 2,