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

/**** 
* Classes
****/ 
// Enemy Car Class (basic)
var EnemyCar = Container.expand(function () {
	var self = Container.call(this);
	var car = self.attachAsset('enemyCar', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.width = car.width;
	self.height = car.height;
	self.speed = 12; // Will increase with level
	self.type = 1;
	self.hp = 1;
	self.crashed = false;
	// Damage indicator graphics (front, back, left, right)
	var indicatorLength = car.width * 0.7;
	var indicatorThickness = 22;
	var indicatorColor = 0xffeb3b;
	// Front indicator (top of car)
	var frontIndicator = self.attachAsset('crashEffect', {
		anchorX: 0.5,
		anchorY: 0.5,
		x: 0,
		y: -car.height / 2 + indicatorThickness / 2,
		scaleX: indicatorLength / 220,
		scaleY: indicatorThickness / 120,
		alpha: 0.7
	});
	// Back indicator (bottom of car)
	var backIndicator = self.attachAsset('crashEffect', {
		anchorX: 0.5,
		anchorY: 0.5,
		x: 0,
		y: car.height / 2 - indicatorThickness / 2,
		scaleX: indicatorLength / 220,
		scaleY: indicatorThickness / 120,
		alpha: 0.7
	});
	// Left indicator (left side of car)
	var leftIndicator = self.attachAsset('crashEffect', {
		anchorX: 0.5,
		anchorY: 0.5,
		x: -car.width / 2 + indicatorThickness / 2,
		y: 0,
		scaleX: indicatorThickness / 120,
		scaleY: indicatorLength / 220,
		alpha: 0.7,
		rotation: Math.PI / 2
	});
	// Right indicator (right side of car)
	var rightIndicator = self.attachAsset('crashEffect', {
		anchorX: 0.5,
		anchorY: 0.5,
		x: car.width / 2 - indicatorThickness / 2,
		y: 0,
		scaleX: indicatorThickness / 120,
		scaleY: indicatorLength / 220,
		alpha: 0.7,
		rotation: Math.PI / 2
	});
	// Hide all indicators initially
	frontIndicator.visible = false;
	backIndicator.visible = false;
	leftIndicator.visible = false;
	rightIndicator.visible = false;
	// Crash effect, now with hitPart argument: "front", "back", "left", "right"
	self.showCrash = function (hitPart) {
		// Only set the indicator on the first hit
		if (!self._firstCrashPart) {
			self._firstCrashPart = hitPart;
		}
		// Hide all indicators
		frontIndicator.visible = false;
		backIndicator.visible = false;
		leftIndicator.visible = false;
		rightIndicator.visible = false;
		// Show only the first hit part indicator
		var showPart = self._firstCrashPart || hitPart;
		if (showPart === "front") {
			frontIndicator.visible = true;
		} else if (showPart === "back") {
			backIndicator.visible = true;
		} else if (showPart === "left") {
			leftIndicator.visible = true;
		} else if (showPart === "right") {
			rightIndicator.visible = true;
		} else {
			frontIndicator.visible = true; // fallback
		}
		var effect = LK.getAsset('crashEffect', {
			anchorX: 0.5,
			anchorY: 0.5,
			x: 0,
			y: 0,
			alpha: 0.8,
			scaleX: 0.5,
			scaleY: 0.5
		});
		self.addChild(effect);
		tween(effect, {
			scaleX: 1.5,
			scaleY: 1.5,
			alpha: 0
		}, {
			duration: 400,
			easing: tween.easeOut,
			onFinish: function onFinish() {
				effect.destroy();
				// Hide indicator after effect
				// Do NOT hide the first hit indicator, keep it visible
			}
		});
	};
	return self;
});
// Enemy Car 2 (tougher, for higher levels)
var EnemyCar2 = Container.expand(function () {
	var self = Container.call(this);
	var car = self.attachAsset('enemyCar2', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.width = car.width;
	self.height = car.height;
	self.speed = 16;
	self.type = 2;
	self.hp = 2;
	self.crashed = false;
	// Damage indicator graphics (front, back, left, right)
	var indicatorLength = car.width * 0.7;
	var indicatorThickness = 22;
	var indicatorColor = 0xffeb3b;
	// Front indicator (top of car)
	var frontIndicator = self.attachAsset('crashEffect', {
		anchorX: 0.5,
		anchorY: 0.5,
		x: 0,
		y: -car.height / 2 + indicatorThickness / 2,
		scaleX: indicatorLength / 220,
		scaleY: indicatorThickness / 120,
		alpha: 0.7
	});
	// Back indicator (bottom of car)
	var backIndicator = self.attachAsset('crashEffect', {
		anchorX: 0.5,
		anchorY: 0.5,
		x: 0,
		y: car.height / 2 - indicatorThickness / 2,
		scaleX: indicatorLength / 220,
		scaleY: indicatorThickness / 120,
		alpha: 0.7
	});
	// Left indicator (left side of car)
	var leftIndicator = self.attachAsset('crashEffect', {
		anchorX: 0.5,
		anchorY: 0.5,
		x: -car.width / 2 + indicatorThickness / 2,
		y: 0,
		scaleX: indicatorThickness / 120,
		scaleY: indicatorLength / 220,
		alpha: 0.7,
		rotation: Math.PI / 2
	});
	// Right indicator (right side of car)
	var rightIndicator = self.attachAsset('crashEffect', {
		anchorX: 0.5,
		anchorY: 0.5,
		x: car.width / 2 - indicatorThickness / 2,
		y: 0,
		scaleX: indicatorThickness / 120,
		scaleY: indicatorLength / 220,
		alpha: 0.7,
		rotation: Math.PI / 2
	});
	// Hide all indicators initially
	frontIndicator.visible = false;
	backIndicator.visible = false;
	leftIndicator.visible = false;
	rightIndicator.visible = false;
	self.showCrash = function (hitPart) {
		// Only set the indicator on the first hit
		if (!self._firstCrashPart) {
			self._firstCrashPart = hitPart;
		}
		// Hide all indicators
		frontIndicator.visible = false;
		backIndicator.visible = false;
		leftIndicator.visible = false;
		rightIndicator.visible = false;
		// Show only the first hit part indicator
		var showPart = self._firstCrashPart || hitPart;
		if (showPart === "front") {
			frontIndicator.visible = true;
		} else if (showPart === "back") {
			backIndicator.visible = true;
		} else if (showPart === "left") {
			leftIndicator.visible = true;
		} else if (showPart === "right") {
			rightIndicator.visible = true;
		} else {
			frontIndicator.visible = true; // fallback
		}
		var effect = LK.getAsset('crashEffect', {
			anchorX: 0.5,
			anchorY: 0.5,
			x: 0,
			y: 0,
			alpha: 0.8,
			scaleX: 0.5,
			scaleY: 0.5
		});
		self.addChild(effect);
		tween(effect, {
			scaleX: 1.5,
			scaleY: 1.5,
			alpha: 0
		}, {
			duration: 400,
			easing: tween.easeOut,
			onFinish: function onFinish() {
				effect.destroy();
				// Do NOT hide the first hit indicator, keep it visible
			}
		});
	};
	return self;
});
// Player Car Class
var PlayerCar = Container.expand(function () {
	var self = Container.call(this);
	var car = self.attachAsset('playerCar', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.width = car.width;
	self.height = car.height;
	self.hp = 1; // Upgradable
	self.invincible = false;
	self.invincibleTimer = 0;
	self.upgradeLevel = 0;
	// Flash effect for invincibility
	self.flashInvincible = function () {
		self.invincible = true;
		self.invincibleTimer = 60; // 1 second at 60fps
		tween(self, {
			alpha: 0.5
		}, {
			duration: 100,
			easing: tween.easeInOut,
			onFinish: function onFinish() {
				tween(self, {
					alpha: 1
				}, {
					duration: 100,
					easing: tween.easeInOut
				});
			}
		});
	};
	// Upgrade effect
	self.showUpgrade = function () {
		var effect = LK.getAsset('upgradeEffect', {
			anchorX: 0.5,
			anchorY: 0.5,
			x: 0,
			y: 0,
			alpha: 0.7,
			scaleX: 0.5,
			scaleY: 0.5
		});
		self.addChild(effect);
		tween(effect, {
			scaleX: 1.5,
			scaleY: 1.5,
			alpha: 0
		}, {
			duration: 500,
			easing: tween.easeOut,
			onFinish: function onFinish() {
				effect.destroy();
			}
		});
	};
	return self;
});

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

/**** 
* Game Code
****/ 
// Arena scroll speed (background illusion)
// Player car: blue box
// Enemy car: red box
// Enemy car 2: green box (for future levels)
// Crash effect: yellow ellipse
// Upgrade effect: purple ellipse
// Sound: crash
// Sound: upgrade
// Music: background
// --- Desert background, cactuses, and dust cloud setup ---
// Add a desert background image (fills the arena)
// new visual for pit/hole
// Stack two desert backgrounds vertically for a longer scrolling road
var desertBg1 = LK.getAsset('desertBg', {
	anchorX: 0,
	anchorY: 0,
	x: 0,
	y: 0,
	width: 2048,
	height: 2732
});
var desertBg2 = LK.getAsset('desertBg', {
	anchorX: 0,
	anchorY: 0,
	x: 0,
	y: -2732,
	width: 2048,
	height: 2732
});
game.addChild(desertBg1);
game.addChild(desertBg2);
// Add more cactuses, only along the left and right edges (not top/bottom or middle)
var cactusPerSide = 8;
for (var i = 0; i < cactusPerSide; i++) {
	// Left edge
	var cactusL = LK.getAsset('cactus', {
		anchorX: 0.5,
		anchorY: 1,
		scaleX: 0.8 + Math.random() * 0.4,
		scaleY: 0.8 + Math.random() * 0.4
	});
	cactusL.x = 100 + cactusL.width / 2;
	// Avoid top/bottom 100px, and avoid the very center (leave a gap in the middle)
	var minY = 200;
	var maxY = 2732 - 200;
	var gapStart = 2732 / 2 - 350;
	var gapEnd = 2732 / 2 + 350;
	var yVal = minY + Math.random() * (maxY - minY);
	// If in the center gap, push up or down
	if (yVal > gapStart && yVal < gapEnd) {
		if (Math.random() < 0.5) {
			yVal = minY + Math.random() * (gapStart - minY);
		} else {
			yVal = gapEnd + Math.random() * (maxY - gapEnd);
		}
	}
	cactusL.y = yVal;
	game.addChild(cactusL);
	// Right edge
	var cactusR = LK.getAsset('cactus', {
		anchorX: 0.5,
		anchorY: 1,
		scaleX: 0.8 + Math.random() * 0.4,
		scaleY: 0.8 + Math.random() * 0.4
	});
	cactusR.x = 2048 - 100 - cactusR.width / 2;
	// Use same y logic as left
	var yValR = minY + Math.random() * (maxY - minY);
	if (yValR > gapStart && yValR < gapEnd) {
		if (Math.random() < 0.5) {
			yValR = minY + Math.random() * (gapStart - minY);
		} else {
			yValR = gapEnd + Math.random() * (maxY - gapEnd);
		}
	}
	cactusR.y = yValR;
	game.addChild(cactusR);
}
// Dust clouds spawn from all screen edges and move in random directions
var dustClouds = [];
var dustCloudCount = 8;
for (var i = 0; i < dustCloudCount; i++) {
	// Randomly pick a spawn edge: 0=top, 1=bottom, 2=left, 3=right
	var edge = Math.floor(Math.random() * 4);
	var x, y, dx, dy;
	var margin = 100;
	var speed = 2 + Math.random() * 2;
	if (edge === 0) {
		// top
		x = margin + Math.random() * (2048 - 2 * margin);
		y = -80;
		dx = (Math.random() - 0.5) * 2;
		dy = speed;
	} else if (edge === 1) {
		// bottom
		x = margin + Math.random() * (2048 - 2 * margin);
		y = 2732 + 80;
		dx = (Math.random() - 0.5) * 2;
		dy = -speed;
	} else if (edge === 2) {
		// left
		x = -80;
		y = margin + Math.random() * (2732 - 2 * margin);
		dx = speed;
		dy = (Math.random() - 0.5) * 2;
	} else {
		// right
		x = 2048 + 80;
		y = margin + Math.random() * (2732 - 2 * margin);
		dx = -speed;
		dy = (Math.random() - 0.5) * 2;
	}
	var dustCloud = LK.getAsset('dustCloud', {
		anchorX: 0.5,
		anchorY: 0.5,
		x: x,
		y: y,
		scaleX: 2.2,
		scaleY: 1.2,
		alpha: 0.5
	});
	dustCloud._dx = dx;
	dustCloud._dy = dy;
	dustCloud._spawnEdge = edge;
	game.addChild(dustCloud);
	dustClouds.push(dustCloud);
}
var scrollSpeed = 10;
// Player
var player = new PlayerCar();
player.x = 2048 / 2;
player.y = 2732 - 500;
game.addChild(player);
// --- Heart (life) system ---
var maxHearts = 3;
var hearts = 0; // Start with 0
var heartIcons = [];
// Create all heart icons at once, hide them initially
for (var i = 0; i < maxHearts; i++) {
	var heart = LK.getAsset('heart', {
		x: 60 + i * 80,
		y: 60,
		anchorX: 0.5,
		anchorY: 0.5,
		scaleX: 0.25,
		scaleY: 0.25
	});
	heart.visible = false;
	game.addChild(heart);
	heartIcons.push(heart);
}
function updateHeartsDisplay() {
	for (var i = 0; i < maxHearts; i++) {
		heartIcons[i].visible = i < hearts;
	}
}
updateHeartsDisplay();
// Score
var score = 0;
var scoreTxt = new Text2('0', {
	size: 120,
	fill: "#fff"
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
// Level
var level = 1;
var levelTxt = new Text2('Lv.1', {
	size: 70,
	fill: "#fff"
});
levelTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(levelTxt);
levelTxt.y = 120;
// Upgrades
var upgradeTxt = new Text2('', {
	size: 70,
	fill: 0xFFD600
});
upgradeTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(upgradeTxt);
upgradeTxt.y = 200;
// Enemies
var enemies = [];
var enemySpawnTimer = 0;
var enemySpawnInterval = 60; // frames
// Dragging
var dragNode = null;
// Invincibility after crash
var invincibleFrames = 0;
// Arena bounds (leave 100px at top for menu)
var arenaLeft = 100;
var arenaRight = 2048 - 100;
var arenaTop = 100;
var arenaBottom = 2732 - 100;
// Music
LK.playMusic('arenaMusic');
// Helper: spawn enemy
function spawnEnemy() {
	var enemy;
	if (level < 3 || Math.random() < 0.7) {
		enemy = new EnemyCar();
	} else {
		enemy = new EnemyCar2();
	}
	// Spawn from center and off-center lanes (not far left/right)
	// Thorns and pits will not slide to the far left and right of the screen
	var laneCenters = [arenaLeft + (arenaRight - arenaLeft) * 0.28,
	// left off-center
	arenaLeft + (arenaRight - arenaLeft) * 0.38,
	// left of center
	(arenaLeft + arenaRight) / 2,
	// center
	arenaLeft + (arenaRight - arenaLeft) * 0.62,
	// right of center
	arenaLeft + (arenaRight - arenaLeft) * 0.72 // right off-center
	];
	var lane = Math.floor(Math.random() * laneCenters.length);
	enemy.x = laneCenters[lane];
	enemy.y = -enemy.height / 2;
	// Speed up with level
	if (enemy.type === 1) {
		enemy.speed = 12 + level * 1.5;
	} else {
		enemy.speed = 16 + level * 1.2;
	}
	enemies.push(enemy);
	game.addChild(enemy);
}
// Helper: upgrade player
function upgradePlayer() {
	player.upgradeLevel += 1;
	player.hp += 1;
	player.showUpgrade();
	upgradeTxt.setText('Upgrade! HP: ' + player.hp);
	LK.getSound('upgrade').play();
	LK.setTimeout(function () {
		upgradeTxt.setText('');
	}, 1200);
}
// Handle move (dragging player)
function handleMove(x, y, obj) {
	if (dragNode === player) {
		// Clamp to arena
		var px = x;
		var py = y;
		var halfW = player.width / 2;
		var halfH = player.height / 2;
		if (px < arenaLeft + halfW) px = arenaLeft + halfW;
		if (px > arenaRight - halfW) px = arenaRight - halfW;
		if (py < arenaTop + halfH) py = arenaTop + halfH;
		if (py > arenaBottom - halfH) py = arenaBottom - halfH;
		player.x = px;
		player.y = py;
	}
}
// Touch/drag events
game.down = function (x, y, obj) {
	// Only start drag if touch is on player
	var dx = x - player.x;
	var dy = y - player.y;
	if (dx * dx + dy * dy < player.width / 2 * (player.width / 2)) {
		dragNode = player;
		handleMove(x, y, obj);
	}
};
game.move = function (x, y, obj) {
	handleMove(x, y, obj);
};
game.up = function (x, y, obj) {
	dragNode = null;
};
// Main update loop
game.update = function () {
	// Scroll both desert backgrounds for a seamless, infinite road effect
	desertBg1.y += scrollSpeed;
	desertBg2.y += scrollSpeed;
	// If a background moves off the bottom, move it to the top of the other
	if (desertBg1.y >= 2732) {
		desertBg1.y = desertBg2.y - 2732;
	}
	if (desertBg2.y >= 2732) {
		desertBg2.y = desertBg1.y - 2732;
	}
	// Animate dust clouds for movement illusion (from all edges)
	if (dustClouds && dustClouds.length) {
		for (var d = 0; d < dustClouds.length; d++) {
			var dc = dustClouds[d];
			dc.x += dc._dx;
			dc.y += dc._dy;
			// If cloud is out of bounds, respawn from a random edge
			var outOfBounds = dc.x < -200 || dc.x > 2048 + 200 || dc.y < -200 || dc.y > 2732 + 200;
			if (outOfBounds) {
				// Pick a new random edge and direction
				var edge = Math.floor(Math.random() * 4);
				var margin = 100;
				var speed = 2 + Math.random() * 2;
				if (edge === 0) {
					// top
					dc.x = margin + Math.random() * (2048 - 2 * margin);
					dc.y = -80;
					dc._dx = (Math.random() - 0.5) * 2;
					dc._dy = speed;
				} else if (edge === 1) {
					// bottom
					dc.x = margin + Math.random() * (2048 - 2 * margin);
					dc.y = 2732 + 80;
					dc._dx = (Math.random() - 0.5) * 2;
					dc._dy = -speed;
				} else if (edge === 2) {
					// left
					dc.x = -80;
					dc.y = margin + Math.random() * (2732 - 2 * margin);
					dc._dx = speed;
					dc._dy = (Math.random() - 0.5) * 2;
				} else {
					// right
					dc.x = 2048 + 80;
					dc.y = margin + Math.random() * (2732 - 2 * margin);
					dc._dx = -speed;
					dc._dy = (Math.random() - 0.5) * 2;
				}
			}
		}
	}
	// --- Pits: spawn, animate, and collision ---
	// Pit setup: global arrays and spawn timer
	if (typeof pits === "undefined") {
		pits = [];
		pitSpawnTimer = 0;
		pitSpawnInterval = 90; // frames, can be tuned
		// Pit lanes: center and off-center, not far left/right
		pitLanes = [arenaLeft + (arenaRight - arenaLeft) * 0.28, arenaLeft + (arenaRight - arenaLeft) * 0.38, (arenaLeft + arenaRight) / 2, arenaLeft + (arenaRight - arenaLeft) * 0.62, arenaLeft + (arenaRight - arenaLeft) * 0.72];
	}
	// Animate pits
	for (var p = pits.length - 1; p >= 0; p--) {
		var pit = pits[p];
		if (pit.lastY === undefined) pit.lastY = pit.y;
		pit.y += scrollSpeed + 14 + level * 0.7; // pits move slightly faster than scroll
		// Remove pit if off screen
		if (pit.lastY <= 2732 + 200 && pit.y > 2732 + 200) {
			pit.destroy();
			pits.splice(p, 1);
			continue;
		}
		pit.lastY = pit.y;
	}
	// Spawn pits
	pitSpawnTimer++;
	var pitInt = Math.max(50, pitSpawnInterval - level * 2);
	if (pitSpawnTimer >= pitInt) {
		// Only spawn in center and off-center lanes, not far left/right
		var lane = Math.floor(Math.random() * pitLanes.length);
		var pit = LK.getAsset('pitHole', {
			anchorX: 0.5,
			anchorY: 0.5,
			x: pitLanes[lane],
			y: -60,
			scaleX: 1.2 + Math.random() * 0.3,
			scaleY: 0.7 + Math.random() * 0.2,
			alpha: 0.95
		});
		pit.width = 180 + Math.random() * 80;
		pit.height = 80 + Math.random() * 30;
		pits.push(pit);
		game.addChild(pit);
		pit.lastY = pit.y;
		pit.lastWasIntersecting = false;
		pit.isPit = true;
		pit.isDeadly = true;
		pit._type = "pit";
		pit._alreadyHit = false;
		pit._id = "pit_" + Date.now() + "_" + Math.floor(Math.random() * 10000);
		pitSpawnTimer = 0;
	}
	// Pit collision with player (kill instantly)
	for (var p = pits.length - 1; p >= 0; p--) {
		var pit = pits[p];
		if (pit._alreadyHit) continue;
		var isIntersecting = player.intersects(pit);
		if (pit.lastWasIntersecting === false && isIntersecting) {
			pit._alreadyHit = true;
			if (hearts > 0 && !player.invincible) {
				// Use a heart, grant invincibility, do not die
				hearts--;
				if (hearts >= 0 && hearts < heartIcons.length) {
					heartIcons[hearts].visible = false;
				}
				updateHeartsDisplay();
				player.flashInvincible();
				LK.effects.flashScreen(0x000000, 600);
			} else {
				LK.effects.flashScreen(0x000000, 1000);
				LK.showGameOver();
				return;
			}
		}
		pit.lastWasIntersecting = isIntersecting;
	}
	// Arena scroll illusion: move all enemies down
	for (var i = enemies.length - 1; i >= 0; i--) {
		var enemy = enemies[i];
		enemy.y += enemy.speed + scrollSpeed;
		// End game if enemy reaches the end of the screen (bottom)
		if (enemy.lastY === undefined) {
			enemy.lastY = enemy.y;
		}
		var screenEndY = 2732 + 100;
		if (enemy.lastY <= screenEndY && enemy.y > screenEndY) {
			// Lose a heart if enemy reaches the end
			hearts--;
			if (hearts >= 0 && hearts < heartIcons.length) {
				heartIcons[hearts].visible = false;
			}
			updateHeartsDisplay();
			LK.effects.flashScreen(0xff0000, 1000);
			// Remove the enemy from the game
			enemy.destroy();
			enemies.splice(i, 1);
			// Game over if no hearts left
			if (hearts <= 0) {
				LK.showGameOver();
				return;
			}
			// Otherwise, continue the game
			continue;
		}
		enemy.lastY = enemy.y;
	}
	// Spawn enemies
	enemySpawnTimer++;
	var spawnInt = Math.max(30, enemySpawnInterval - level * 2);
	if (enemySpawnTimer >= spawnInt) {
		spawnEnemy();
		enemySpawnTimer = 0;
	}
	// Collision: player vs enemies
	for (var i = enemies.length - 1; i >= 0; i--) {
		var enemy = enemies[i];
		if (enemy.crashed) continue;
		if (player.invincible) continue;
		if (player.intersects(enemy)) {
			// Determine which side of the enemy was hit by the player
			var dx = player.x - enemy.x;
			var dy = player.y - enemy.y;
			var absDx = Math.abs(dx);
			var absDy = Math.abs(dy);
			var hitPart = "front";
			if (absDx > absDy) {
				// Side hit
				if (dx < 0) {
					hitPart = "left";
				} else {
					hitPart = "right";
				}
			} else {
				// Vertical hit
				if (dy < 0) {
					hitPart = "front";
				} else {
					hitPart = "back";
				}
			}
			// Only allow crash and destroy if hitPart is "back"
			if (hitPart === "back") {
				// Crash!
				// For EnemyCar2, require 2 hits to destroy
				if (enemy.type === 2) {
					if (typeof enemy._hitCount === "undefined") enemy._hitCount = 0;
					enemy._hitCount++;
					enemy.showCrash(hitPart);
					LK.getSound('crash').play();
					// Only destroy and score after 2 hits
					if (enemy._hitCount >= 2) {
						enemy.crashed = true;
						score += 10;
						LK.setScore(score);
						scoreTxt.setText(score);
						// Remove enemy after effect
						LK.setTimeout(function (e, idx) {
							return function () {
								if (enemies[idx] === e) {
									e.destroy();
									enemies.splice(idx, 1);
								}
							};
						}(enemy, i), 400);
					}
					// Player does not take damage, only enemy is destroyed
				} else {
					enemy.crashed = true;
					enemy.showCrash(hitPart);
					LK.getSound('crash').play();
					score += 10;
					LK.setScore(score);
					scoreTxt.setText(score);
					// Remove enemy after effect
					LK.setTimeout(function (e, idx) {
						return function () {
							if (enemies[idx] === e) {
								e.destroy();
								enemies.splice(idx, 1);
							}
						};
					}(enemy, i), 400);
					// Player does not take damage, only enemy is destroyed
				}
			}
		}
	}
	// --- Blur effect when player collides with dust cloud ---
	if (typeof game._blurActive === "undefined") {
		game._blurActive = false;
		game._blurLastIntersecting = false;
	}
	// Check intersection with any dust cloud
	var dustCloudIntersecting = false;
	if (dustClouds && dustClouds.length) {
		for (var d = 0; d < dustClouds.length; d++) {
			if (player.intersects(dustClouds[d])) {
				dustCloudIntersecting = true;
				break;
			}
		}
	}
	if (!game._blurLastIntersecting && dustCloudIntersecting && !game._blurActive) {
		game._blurActive = true;
		// Darken the screen more when colliding with a dust cloud
		LK.effects.flashScreen(0x000000, 1200, {
			alpha: 0.55
		}); // More darkness, longer duration
		// Optionally, you can still use blur if you want both effects:
		// if (LK.effects && typeof LK.effects.blurScreen === "function") {
		//     LK.effects.blurScreen(8, 2000);
		// }
		LK.setTimeout(function () {
			game._blurActive = false;
		}, 1200);
	}
	game._blurLastIntersecting = dustCloudIntersecting;
	// Invincibility timer
	if (player.invincible) {
		player.invincibleTimer--;
		if (player.invincibleTimer <= 0) {
			player.invincible = false;
			player.alpha = 1;
		}
	}
	// Level up every 100 points
	var newLevel = Math.floor(score / 100) + 1;
	if (newLevel > level) {
		level = newLevel;
		levelTxt.setText('Lv.' + level);
		// Every 2 levels, upgrade player
		if (level % 2 === 0) {
			upgradePlayer();
		}
		// Every 5 levels, gain a heart (up to 3), starting from 0
		var newHearts = Math.min(Math.floor(level / 5), maxHearts);
		if (newHearts > hearts) {
			hearts = newHearts;
			updateHeartsDisplay();
		}
	}
};

===================================================================
--- original.js
+++ change.js
@@ -763,10 +763,10 @@
 				} else {
 					hitPart = "back";
 				}
 			}
-			// Only allow crash and destroy if hitPart is "front"
-			if (hitPart === "front") {
+			// Only allow crash and destroy if hitPart is "back"
+			if (hitPart === "back") {
 				// Crash!
 				// For EnemyCar2, require 2 hits to destroy
 				if (enemy.type === 2) {
 					if (typeof enemy._hitCount === "undefined") enemy._hitCount = 0;