/**** 
* Plugins
****/ 
var tween = LK.import("@upit/tween.v1");
var storage = LK.import("@upit/storage.v1", {
	bestScore: 0
});

/**** 
* Classes
****/ 
// Player Car
var Car = Container.expand(function () {
	var self = Container.call(this);
	var carAsset = self.attachAsset('car', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	// For collision box, use the car asset's size
	self.width = carAsset.width;
	self.height = carAsset.height;
	return self;
});
// Coin class removed (no longer needed)
// Obstacle
var Obstacle = Container.expand(function () {
	var self = Container.call(this);
	var obsAsset = self.attachAsset('obstacle', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.width = obsAsset.width;
	self.height = obsAsset.height;
	// For collision
	return self;
});
// Road Stripe
var Stripe = Container.expand(function () {
	var self = Container.call(this);
	var stripeAsset = self.attachAsset('stripe', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.width = stripeAsset.width;
	self.height = stripeAsset.height;
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x222222
});

/**** 
* Game Code
****/ 
// LK.init.shape('coin', {width:100, height:100, color:0xffeb3b, shape:'ellipse'})
// Game area
// Car (player)
// Obstacle
// Coin
// Road stripes
var GAME_WIDTH = 2048;
var GAME_HEIGHT = 2732;
var ROAD_WIDTH = 1200;
var ROAD_X = (GAME_WIDTH - ROAD_WIDTH) / 2;
var ROAD_Y = 0;
var ROAD_HEIGHT = GAME_HEIGHT;
// Player car
var car = new Car();
car.x = GAME_WIDTH / 2;
car.y = GAME_HEIGHT - 500;
game.addChild(car);
// Road stripes
var stripes = [];
var stripeSpacing = 400;
for (var i = 0; i < 8; i++) {
	var stripe = new Stripe();
	stripe.x = GAME_WIDTH / 2;
	stripe.y = i * stripeSpacing + 200;
	stripes.push(stripe);
	game.addChild(stripe);
}
// Obstacles and coins
var obstacles = [];
var coins = [];
// Score
var score = 0;
var scoreTxt = new Text2('0', {
	size: 120,
	fill: "#fff"
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
// Best score
var bestScore = storage.bestScore || 0;
var bestScoreTxt = new Text2('Best: ' + bestScore, {
	size: 60,
	fill: "#fff"
});
bestScoreTxt.anchor.set(0.5, 0);
bestScoreTxt.y = 120;
LK.gui.top.addChild(bestScoreTxt);
// Game speed
var baseSpeed = 18;
var speed = baseSpeed;
var speedIncreaseEvery = 600; // ticks
var maxSpeed = 48;
// Gear system
var gear = 1;
var maxGear = 5;
var minGear = 1;
var gearSpeeds = [0, 18, 26, 34, 42, 48]; // index 0 unused, gear 1-5
// Dragging
var dragCar = false;
var dragOffsetX = 0;
// Drift system state
var isDrifting = false;
var driftDirection = 0; // -1 for left, 1 for right, 0 for none
var driftTimer = 0;
var driftMaxTime = 60; // frames (1 second)
var driftCooldown = 0;
var driftCooldownTime = 40; // frames
var driftAngle = 0; // in radians, for visual tilt
var driftAngleMax = Math.PI / 7; // max tilt angle
var driftSpeedBonus = 1.18; // 18% speed boost during drift
// Gas and brake button state
var gasPressed = false;
var brakePressed = false;
// Touch controls
function clamp(val, min, max) {
	return val < min ? min : val > max ? max : val;
}
function handleMove(x, y, obj) {
	if (dragCar) {
		// Clamp car within road
		var minX = ROAD_X + car.width / 2 + 20;
		var maxX = ROAD_X + ROAD_WIDTH - car.width / 2 - 20;
		var prevX = car.x;
		car.x = clamp(x - dragOffsetX, minX, maxX);
		// Drift trigger: if swipe is fast and not already drifting or on cooldown
		var dx = car.x - prevX;
		if (!isDrifting && driftCooldown === 0 && Math.abs(dx) > 32) {
			isDrifting = true;
			driftDirection = dx > 0 ? 1 : -1;
			driftTimer = 0;
		}
	}
}
game.move = handleMove;
// --- Gas and Brake Buttons ---
var buttonSize = 260;
var buttonMargin = 80;
// Gas button (bottom right)
var gasBtn = new Container();
var gasAsset = gasBtn.attachAsset('car', {
	anchorX: 0.5,
	anchorY: 0.5,
	width: buttonSize,
	height: buttonSize,
	color: 0x43a047
});
gasAsset.tint = 0x43a047;
gasBtn.x = GAME_WIDTH - buttonSize / 2 - buttonMargin;
gasBtn.y = GAME_HEIGHT - buttonSize / 2 - buttonMargin;
game.addChild(gasBtn);
var gasTxt = new Text2('GAS', {
	size: 70,
	fill: "#fff"
});
gasTxt.anchor.set(0.5, 0.5);
gasBtn.addChild(gasTxt);
// Brake button (bottom left)
var brakeBtn = new Container();
var brakeAsset = brakeBtn.attachAsset('car', {
	anchorX: 0.5,
	anchorY: 0.5,
	width: buttonSize,
	height: buttonSize,
	color: 0xfbc02d
});
brakeAsset.tint = 0xfbc02d;
brakeBtn.x = buttonSize / 2 + buttonMargin;
brakeBtn.y = GAME_HEIGHT - buttonSize / 2 - buttonMargin;
game.addChild(brakeBtn);
var brakeTxt = new Text2('BRAKE', {
	size: 70,
	fill: "#fff"
});
brakeTxt.anchor.set(0.5, 0.5);
brakeBtn.addChild(brakeTxt);
// Gear Up button (bottom center right)
var gearUpBtn = new Container();
var gearUpAsset = gearUpBtn.attachAsset('car', {
	anchorX: 0.5,
	anchorY: 0.5,
	width: buttonSize * 0.7,
	height: buttonSize * 0.7,
	color: 0x90caf9
});
gearUpAsset.tint = 0x90caf9;
gearUpBtn.x = GAME_WIDTH / 2 + buttonSize + buttonMargin;
gearUpBtn.y = GAME_HEIGHT - buttonSize / 2 - buttonMargin;
game.addChild(gearUpBtn);
var gearUpTxt = new Text2('GEAR+', {
	size: 60,
	fill: "#fff"
});
gearUpTxt.anchor.set(0.5, 0.5);
gearUpBtn.addChild(gearUpTxt);
// Gear Down button (bottom center left)
var gearDownBtn = new Container();
var gearDownAsset = gearDownBtn.attachAsset('car', {
	anchorX: 0.5,
	anchorY: 0.5,
	width: buttonSize * 0.7,
	height: buttonSize * 0.7,
	color: 0x90caf9
});
gearDownAsset.tint = 0x90caf9;
gearDownBtn.x = GAME_WIDTH / 2 - buttonSize - buttonMargin;
gearDownBtn.y = GAME_HEIGHT - buttonSize / 2 - buttonMargin;
game.addChild(gearDownBtn);
var gearDownTxt = new Text2('GEAR-', {
	size: 60,
	fill: "#fff"
});
gearDownTxt.anchor.set(0.5, 0.5);
gearDownBtn.addChild(gearDownTxt);
// Gear display (center bottom)
var gearTxt = new Text2('GEAR: 1', {
	size: 80,
	fill: "#fff"
});
gearTxt.anchor.set(0.5, 0.5);
gearTxt.x = GAME_WIDTH / 2;
gearTxt.y = GAME_HEIGHT - buttonSize - buttonMargin - 60;
game.addChild(gearTxt);
// Helper to check if a point is inside a button
function isInsideBtn(btn, x, y) {
	var bx = btn.x,
		by = btn.y;
	var hw = buttonSize / 2,
		hh = buttonSize / 2;
	return x >= bx - hw && x <= bx + hw && y >= by - hh && y <= by + hh;
}
// Down event
game.down = function (x, y, obj) {
	// Only start drag if touch is on car
	var local = car.toLocal(game.toGlobal({
		x: x,
		y: y
	}));
	if (local.x >= -car.width / 2 && local.x <= car.width / 2 && local.y >= -car.height / 2 && local.y <= car.height / 2) {
		dragCar = true;
		dragOffsetX = x - car.x;
	}
	// Gas/brake buttons
	if (isInsideBtn(gasBtn, x, y)) {
		gasPressed = true;
		gasAsset.alpha = 0.7;
	}
	if (isInsideBtn(brakeBtn, x, y)) {
		brakePressed = true;
		brakeAsset.alpha = 0.7;
	}
	// Gear up button
	if (isInsideBtn(gearUpBtn, x, y)) {
		if (gear < maxGear) {
			gear++;
			gearTxt.setText('GEAR: ' + gear);
			// Snap speed to new gear's minimum if below
			if (speed < gearSpeeds[gear]) speed = gearSpeeds[gear];
		}
		gearUpAsset.alpha = 0.7;
	}
	// Gear down button
	if (isInsideBtn(gearDownBtn, x, y)) {
		if (gear > minGear) {
			gear--;
			gearTxt.setText('GEAR: ' + gear);
			// Snap speed to new gear's max if above
			if (speed > gearSpeeds[gear]) speed = gearSpeeds[gear];
		}
		gearDownAsset.alpha = 0.7;
	}
};
// Up event
game.up = function (x, y, obj) {
	dragCar = false;
	gasPressed = false;
	brakePressed = false;
	gasAsset.alpha = 1;
	brakeAsset.alpha = 1;
	gearUpAsset.alpha = 1;
	gearDownAsset.alpha = 1;
};
// Spawning
var obstacleTimer = 0;
var coinTimer = 0;
function spawnObstacle() {
	var obs = new Obstacle();
	// Random lane
	var lanes = 4;
	var laneWidth = ROAD_WIDTH / lanes;
	var lane = Math.floor(Math.random() * lanes);
	obs.x = ROAD_X + laneWidth * (lane + 0.5);
	obs.y = -obs.height;
	obstacles.push(obs);
	game.addChild(obs);
}
// function spawnCoin removed (no longer needed)
// Main update loop
game.update = function () {
	// Drift update logic
	if (isDrifting) {
		driftTimer++;
		// Smoothly tilt car in drift direction
		driftAngle += (driftDirection * driftAngleMax - driftAngle) * 0.25;
		// Give speed bonus during drift
		speed = Math.min(speed * driftSpeedBonus, gearSpeeds[gear]);
		// End drift after max time or if drag stops
		if (driftTimer > driftMaxTime || !dragCar) {
			isDrifting = false;
			driftCooldown = driftCooldownTime;
		}
	} else {
		// Return car to upright
		driftAngle += (0 - driftAngle) * 0.18;
		if (driftCooldown > 0) driftCooldown--;
	}
	// Gas/brake logic
	if (gasPressed) {
		speed = Math.min(speed + 0.5, gearSpeeds[gear]);
	} else if (brakePressed) {
		speed = Math.max(speed - 1.2, gearSpeeds[gear - 1] ? gearSpeeds[gear - 1] : baseSpeed * 0.5);
	} else {
		// Speed up over time
		if (LK.ticks % speedIncreaseEvery === 0 && speed < gearSpeeds[gear]) {
			speed += 2;
		}
	}
	// Clamp speed to current gear range
	if (speed > gearSpeeds[gear]) speed = gearSpeeds[gear];
	if (speed < (gearSpeeds[gear - 1] ? gearSpeeds[gear - 1] : baseSpeed * 0.5)) speed = gearSpeeds[gear - 1] ? gearSpeeds[gear - 1] : baseSpeed * 0.5;
	gearTxt.setText('GEAR: ' + gear);
	// Apply drift visual tilt to car
	car.rotation = driftAngle;
	// Move stripes
	for (var i = 0; i < stripes.length; i++) {
		stripes[i].y += speed;
		if (stripes[i].y > GAME_HEIGHT + stripes[i].height / 2) {
			stripes[i].y -= stripeSpacing * stripes.length;
		}
	}
	// Spawn obstacles
	obstacleTimer += 1;
	if (obstacleTimer > 32 + Math.floor(40 * baseSpeed / speed)) {
		// Spawn 1-2 obstacles per spawn, but never in the same lane
		var lanes = 4;
		var usedLanes = [];
		var numObstacles = 1 + (Math.random() < 0.5 ? 1 : 0); // 1 or 2
		for (var i = 0; i < numObstacles; i++) {
			var lane;
			do {
				lane = Math.floor(Math.random() * lanes);
			} while (usedLanes.indexOf(lane) !== -1 && usedLanes.length < lanes);
			usedLanes.push(lane);
			var obs = new Obstacle();
			var laneWidth = ROAD_WIDTH / lanes;
			obs.x = ROAD_X + laneWidth * (lane + 0.5);
			obs.y = -obs.height;
			obstacles.push(obs);
			game.addChild(obs);
		}
		obstacleTimer = 0;
	}
	// Coin spawning removed
	// Move obstacles
	for (var i = obstacles.length - 1; i >= 0; i--) {
		var obs = obstacles[i];
		obs.y += speed;
		// Remove if off screen
		if (obs.y - obs.height / 2 > GAME_HEIGHT + 100) {
			obs.destroy();
			obstacles.splice(i, 1);
			continue;
		}
		// Collision with car
		if (car.intersects(obs)) {
			// Flash and game over
			LK.effects.flashScreen(0xff0000, 800);
			if (score > bestScore) {
				storage.bestScore = score;
			}
			LK.showGameOver();
			return;
		}
	}
	// Move coins
	for (var i = coins.length - 1; i >= 0; i--) {
		var coin = coins[i];
		coin.y += speed;
		// Remove if off screen
		if (coin.y - coin.height / 2 > GAME_HEIGHT + 100) {
			coin.destroy();
			coins.splice(i, 1);
			continue;
		}
	}
	score += Math.floor(speed / 4); // Slow down score growth by 75%
	scoreTxt.setText(score);
	// Speed up by 1% for every 2000 score points
	if (typeof lastScoreForSpeed === "undefined") {
		lastScoreForSpeed = 0;
	}
	while (score - lastScoreForSpeed >= 2000) {
		speed = Math.min(Math.round(speed * 1.01), maxSpeed);
		lastScoreForSpeed += 2000;
	}
	if (score > bestScore) {
		bestScore = score;
		bestScoreTxt.setText('Best: ' + bestScore);
		storage.bestScore = bestScore;
	}
};
// Reset score on new game
score = 0;
scoreTxt.setText(score);
bestScore = storage.bestScore || 0;
bestScoreTxt.setText('Best: ' + bestScore);
// Reset drift state
isDrifting = false;
driftDirection = 0;
driftTimer = 0;
driftCooldown = 0;
driftAngle = 0;
car.rotation = 0;

===================================================================
--- original.js
+++ change.js
@@ -115,8 +115,18 @@
 var gearSpeeds = [0, 18, 26, 34, 42, 48]; // index 0 unused, gear 1-5
 // Dragging
 var dragCar = false;
 var dragOffsetX = 0;
+// Drift system state
+var isDrifting = false;
+var driftDirection = 0; // -1 for left, 1 for right, 0 for none
+var driftTimer = 0;
+var driftMaxTime = 60; // frames (1 second)
+var driftCooldown = 0;
+var driftCooldownTime = 40; // frames
+var driftAngle = 0; // in radians, for visual tilt
+var driftAngleMax = Math.PI / 7; // max tilt angle
+var driftSpeedBonus = 1.18; // 18% speed boost during drift
 // Gas and brake button state
 var gasPressed = false;
 var brakePressed = false;
 // Touch controls
@@ -127,9 +137,17 @@
 	if (dragCar) {
 		// Clamp car within road
 		var minX = ROAD_X + car.width / 2 + 20;
 		var maxX = ROAD_X + ROAD_WIDTH - car.width / 2 - 20;
+		var prevX = car.x;
 		car.x = clamp(x - dragOffsetX, minX, maxX);
+		// Drift trigger: if swipe is fast and not already drifting or on cooldown
+		var dx = car.x - prevX;
+		if (!isDrifting && driftCooldown === 0 && Math.abs(dx) > 32) {
+			isDrifting = true;
+			driftDirection = dx > 0 ? 1 : -1;
+			driftTimer = 0;
+		}
 	}
 }
 game.move = handleMove;
 // --- Gas and Brake Buttons ---
@@ -295,8 +313,25 @@
 }
 // function spawnCoin removed (no longer needed)
 // Main update loop
 game.update = function () {
+	// Drift update logic
+	if (isDrifting) {
+		driftTimer++;
+		// Smoothly tilt car in drift direction
+		driftAngle += (driftDirection * driftAngleMax - driftAngle) * 0.25;
+		// Give speed bonus during drift
+		speed = Math.min(speed * driftSpeedBonus, gearSpeeds[gear]);
+		// End drift after max time or if drag stops
+		if (driftTimer > driftMaxTime || !dragCar) {
+			isDrifting = false;
+			driftCooldown = driftCooldownTime;
+		}
+	} else {
+		// Return car to upright
+		driftAngle += (0 - driftAngle) * 0.18;
+		if (driftCooldown > 0) driftCooldown--;
+	}
 	// Gas/brake logic
 	if (gasPressed) {
 		speed = Math.min(speed + 0.5, gearSpeeds[gear]);
 	} else if (brakePressed) {
@@ -310,8 +345,10 @@
 	// Clamp speed to current gear range
 	if (speed > gearSpeeds[gear]) speed = gearSpeeds[gear];
 	if (speed < (gearSpeeds[gear - 1] ? gearSpeeds[gear - 1] : baseSpeed * 0.5)) speed = gearSpeeds[gear - 1] ? gearSpeeds[gear - 1] : baseSpeed * 0.5;
 	gearTxt.setText('GEAR: ' + gear);
+	// Apply drift visual tilt to car
+	car.rotation = driftAngle;
 	// Move stripes
 	for (var i = 0; i < stripes.length; i++) {
 		stripes[i].y += speed;
 		if (stripes[i].y > GAME_HEIGHT + stripes[i].height / 2) {
@@ -392,5 +429,12 @@
 // Reset score on new game
 score = 0;
 scoreTxt.setText(score);
 bestScore = storage.bestScore || 0;
-bestScoreTxt.setText('Best: ' + bestScore);
\ No newline at end of file
+bestScoreTxt.setText('Best: ' + bestScore);
+// Reset drift state
+isDrifting = false;
+driftDirection = 0;
+driftTimer = 0;
+driftCooldown = 0;
+driftAngle = 0;
+car.rotation = 0;
\ No newline at end of file