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

/**** 
* Classes
****/ 
// EnemyBike class: faster enemy type
var EnemyBike = Container.expand(function () {
	var self = Container.call(this);
	// Attach enemyBike asset (image, facing upward)
	var bike = self.attachAsset('enemyBike', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	// Set vertical speed (will be set on spawn)
	self.speedY = 24;
	// Track lastY for event triggers
	self.lastY = self.y;
	self.update = function () {
		self.lastY = self.y;
		self.y += self.speedY;
		// EnemyBike moves straight down in its lane
	};
	return self;
});
// Motorcycle class: player-controlled bike
var Motorcycle = Container.expand(function () {
	var self = Container.call(this);
	// Attach motorcycle asset (image, facing upward)
	var bike = self.attachAsset('motorcycle', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	// Set initial speed and direction
	self.speedY = 18; // vertical speed (track scrolls down)
	self.laneSpeed = 0; // horizontal speed (player control)
	self.maxX = 2048 - bike.width / 2;
	self.minX = bike.width / 2;
	// Track lastX for event triggers
	self.lastX = self.x;
	// Update method: move forward, apply lane movement
	self.update = function () {
		self.lastX = self.x;
		self.x += self.laneSpeed;
		// --- Invisible collision boundaries at road edges ---
		// Calculate road boundaries (match neon lines)
		var roadLeftEdge = 2048 / 2 - 600;
		var roadRightEdge = 2048 / 2 + 600;
		var bikeHalfWidth = self.width ? self.width / 2 : 60; // fallback if width not set
		// Left boundary collision
		if (self.x - bikeHalfWidth < roadLeftEdge) {
			self.x = roadLeftEdge + bikeHalfWidth;
			// Bounce-back effect: nudge right with tween if just hit
			if (self.lastX - bikeHalfWidth >= roadLeftEdge) {
				tween.stop(self, {
					x: true
				});
				tween(self, {
					x: self.x + 40
				}, {
					duration: 80,
					easing: tween.cubicOut,
					onFinish: function onFinish() {
						tween(self, {
							x: roadLeftEdge + bikeHalfWidth
						}, {
							duration: 60,
							easing: tween.cubicIn
						});
					}
				});
			}
		}
		// Right boundary collision
		if (self.x + bikeHalfWidth > roadRightEdge) {
			self.x = roadRightEdge - bikeHalfWidth;
			// Bounce-back effect: nudge left with tween if just hit
			if (self.lastX + bikeHalfWidth <= roadRightEdge) {
				tween.stop(self, {
					x: true
				});
				tween(self, {
					x: self.x - 40
				}, {
					duration: 80,
					easing: tween.cubicOut,
					onFinish: function onFinish() {
						tween(self, {
							x: roadRightEdge - bikeHalfWidth
						}, {
							duration: 60,
							easing: tween.cubicIn
						});
					}
				});
			}
		}
	};
	return self;
});
// Obstacle class: static/dynamic hazards
var Obstacle = Container.expand(function () {
	var self = Container.call(this);
	// Attach obstacle asset (box, red)
	var obs = self.attachAsset('obstacle', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	// Set vertical speed (scrolls with track)
	self.speedY = 18;
	// Track lastY for event triggers
	self.lastY = self.y;
	self.update = function () {
		self.lastY = self.y;
		self.y += self.speedY;
	};
	return self;
});
// PowerUp class: collectible items
var PowerUp = Container.expand(function () {
	var self = Container.call(this);
	// Attach powerup asset (ellipse, yellow)
	var pu = self.attachAsset('powerup', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speedY = 18;
	self.lastY = self.y;
	self.update = function () {
		self.lastY = self.y;
		self.y += self.speedY;
	};
	return self;
});

/**** 
* Initialize Game
****/ 
// Motorcycle asset (blue box)
// Obstacle asset (red box)
// PowerUp asset (yellow ellipse)
var game = new LK.Game({
	backgroundColor: 0x000000
});

/**** 
* Game Code
****/ 
// --- Combo Counter ---
//Minimalistic tween library which should be used for animations over time, including tinting / colouring an object, scaling, rotating, or changing any game object property.
var comboCount = 0;
var comboText = new Text2('Combo! 0', {
	size: 60,
	fill: "#fff",
	font: "Arial, Helvetica, sans-serif"
});
comboText.anchor.set(1, 0); // Match scoreTxt anchor (right edge, top)
// comboText.x and comboText.y will be set after scoreTxt is defined
// Helper to update comboText display and position
function updateComboText() {
	// Always show "Combo! 0" when comboCount is zero
	comboText.setText("Combo! " + comboCount);
	comboText.visible = true;
	// Position below scoreTxt, right-aligned
	comboText.anchor.set(1, 0);
	comboText.x = scoreTxt.x;
	comboText.y = scoreTxt.y + scoreTxt.height + 10;
	if (comboText.parent !== LK.gui.topRight) {
		if (comboText.parent) {
			comboText.parent.removeChild(comboText);
		}
		LK.gui.topRight.addChild(comboText);
	}
}
// Ensure comboText is added to the display list so it appears on screen
if (!comboText.parent) {
	LK.gui.topRight.addChild(comboText);
}
// --- Katana Combo System ---
var katanaComboIndex = 0;
// --- Katana Combo Sound System ---
var katanaSounds = ["katanaslashsound", "katanaslash", "katanaslash1", "katanaslash2", "katanaslash3"];
// Track the currently playing katana sound instance
var currentKatanaSound = null;
function playKatanaComboSound() {
	if (Array.isArray(katanaSounds) && katanaSounds.length > 0) {
		// Use a unique sound channel for katanaSlash sounds
		var katanaChannel = "katanaComboChannel";
		// Stop any currently playing katana sound instance
		if (currentKatanaSound && typeof currentKatanaSound.stop === "function") {
			currentKatanaSound.stop();
		}
		var soundId = katanaSounds[katanaComboIndex];
		var sound = LK.getSound(soundId);
		if (sound && typeof sound.play === "function") {
			// Play the sound on the unique channel
			sound.play({
				channel: katanaChannel
			});
			currentKatanaSound = sound;
		} else {
			currentKatanaSound = null;
		}
		katanaComboIndex++;
		if (katanaComboIndex >= katanaSounds.length) {
			katanaComboIndex = 0;
		}
	}
}
// --- Road Background ---
// Motorcycle asset (blue box)
// Obstacle asset (red box)
// PowerUp asset (yellow ellipse)
// --- Game State ---
// Road background: gray
// (punchProjectile logic removed)
// Robust typeof helper for sandboxed environment (no Symbol polyfill issues)
// Robust typeof helper for sandboxed environment (no Symbol polyfill issues)
function _typeof9(o) {
	"@babel/helpers - typeof";
	return _typeof9 = "function" == typeof Symbol && "symbol" == typeof Symbol.iterator ? function (o) {
		return typeof o;
	} : function (o) {
		return o && "function" == typeof Symbol && o.constructor === Symbol && o !== Symbol.prototype ? "symbol" : typeof o;
	}, _typeof9(o);
}
function _typeof8(o) {
	"@babel/helpers - typeof";
	return _typeof8 = "function" == typeof Symbol && "symbol" == typeof Symbol.iterator ? function (o) {
		return typeof o;
	} : function (o) {
		return o && "function" == typeof Symbol && o.constructor === Symbol && o !== Symbol.prototype ? "symbol" : typeof o;
	}, _typeof8(o);
}
function _typeof7(o) {
	"@babel/helpers - typeof";
	return _typeof7 = "function" == typeof Symbol && "symbol" == typeof Symbol.iterator ? function (o) {
		return typeof o;
	} : function (o) {
		return o && "function" == typeof Symbol && o.constructor === Symbol && o !== Symbol.prototype ? "symbol" : typeof o;
	}, _typeof7(o);
}
function _typeof6(o) {
	"@babel/helpers - typeof";
	return _typeof6 = "function" == typeof Symbol && "symbol" == typeof Symbol.iterator ? function (o) {
		return typeof o;
	} : function (o) {
		return o && "function" == typeof Symbol && o.constructor === Symbol && o !== Symbol.prototype ? "symbol" : typeof o;
	}, _typeof6(o);
}
function _typeof5(o) {
	"@babel/helpers - typeof";
	return _typeof5 = "function" == typeof Symbol && "symbol" == typeof Symbol.iterator ? function (o) {
		return typeof o;
	} : function (o) {
		return o && "function" == typeof Symbol && o.constructor === Symbol && o !== Symbol.prototype ? "symbol" : typeof o;
	}, _typeof5(o);
}
function _typeof4(o) {
	// Robust typeof helper for sandboxed environment (no Symbol polyfill issues)
	if (o === null) {
		return "object";
	}
	var t = _typeof5(o);
	// Defensive: avoid TypeError if t is undefined or not a string
	if (typeof t === "undefined") {
		return "undefined";
	}
	if (typeof t !== "string") {
		return t;
	}
	// Defensive: avoid accessing t[0] if t is undefined, not a string, or empty
	if (!t || typeof t !== "string" || t.length === 0) {
		return t;
	}
	if (t[0] !== "o") {
		return t;
	}
	// Defensive: avoid accessing properties of undefined or null
	// No Symbol checks, just return "object" for objects/arrays
	return t;
}
function _typeof3(o) {
	// Robust typeof helper for sandboxed environment (no Symbol polyfill issues)
	if (o === null) {
		return "object";
	}
	var t = _typeof5(o);
	if (t !== "object") {
		return t;
	}
	// Array.isArray is always "object" in typeof
	return t;
}
function _typeof2(o) {
	// Only use native typeof, avoid Symbol checks for compatibility and sandbox errors
	// This is safe in all supported environments
	if (o === null) {
		return "object";
	}
	var t = _typeof5(o);
	if (t !== "object") {
		return t;
	}
	return t;
}
function _typeof(o) {
	return _typeof2(o);
}
var roadCenterX = 2048 / 2;
var roadBg1 = LK.getAsset('roadBg', {
	anchorX: 0.5,
	anchorY: 0,
	width: 1200,
	height: 2732,
	x: roadCenterX,
	y: 0
});
var roadBg2 = LK.getAsset('roadBg', {
	anchorX: 0.5,
	anchorY: 0,
	width: 1200,
	height: 2732,
	x: roadCenterX,
	y: -2732
});
// If the asset doesn't exist, create it as a gray box
if (!roadBg1) {
	roadBg1 = LK.getAsset('roadBg', {
		anchorX: 0.5,
		anchorY: 0,
		width: 1200,
		height: 2732,
		x: roadCenterX,
		y: 0
	});
	roadBg2 = LK.getAsset('roadBg', {
		anchorX: 0.5,
		anchorY: 0,
		width: 1200,
		height: 2732,
		x: roadCenterX,
		y: -2732
	});
}
game.addChild(roadBg1);
game.addChild(roadBg2);
// --- Road Boundary Lines (Neon) ---
// Define neon color (electric blue)
var boundaryColor = 0x00ffff; // Electric blue
var boundaryWidth = 12;
var boundaryHeight = 2732;
var roadLeftEdge = roadCenterX - 600; // roadBg is 1200 wide, centered
var roadRightEdge = roadCenterX + 600;
// Left boundary line
var leftBoundary = LK.getAsset('laneDash', {
	width: boundaryWidth,
	height: boundaryHeight,
	color: boundaryColor,
	anchorX: 0.5,
	anchorY: 0
});
leftBoundary.x = roadLeftEdge;
leftBoundary.y = 0;
game.addChild(leftBoundary);
// Right boundary line
var rightBoundary = LK.getAsset('laneDash', {
	width: boundaryWidth,
	height: boundaryHeight,
	color: boundaryColor,
	anchorX: 0.5,
	anchorY: 0
});
rightBoundary.x = roadRightEdge;
rightBoundary.y = 0;
game.addChild(rightBoundary);
// Lane definitions for 3-lane road (centered, full width 2048)
var laneCount = 3;
var laneWidth = 400;
var laneX = [2048 / 2 - laneWidth,
// left lane center
2048 / 2,
// center lane center
2048 / 2 + laneWidth // right lane center
];
// --- Lane Lines (dashed) ---
var laneLineContainers = [];
var laneLineCount = 2; // 2 lines between 3 lanes
var dashHeight = 80;
var dashGap = 80;
var lineWidth = 16;
var lineColor = 0xffffff;
var roadTop = 0;
var roadBottom = 2732;
var dashesPerLine = Math.ceil((roadBottom - roadTop) / (dashHeight + dashGap)) + 2;
for (var i = 0; i < laneLineCount; i++) {
	var lineContainer = new Container();
	var x = (laneX[i] + laneX[i + 1]) / 2;
	for (var d = 0; d < dashesPerLine; d++) {
		// Use the laneDash asset for white dashes
		var dash = LK.getAsset('laneDash', {
			width: lineWidth,
			height: dashHeight,
			anchorX: 0.5,
			anchorY: 0
		});
		dash.x = x;
		dash.y = roadTop + d * (dashHeight + dashGap);
		lineContainer.addChild(dash);
	}
	laneLineContainers.push(lineContainer);
	game.addChild(lineContainer);
}
var player = new Motorcycle();
player.x = 2048 / 2; // Center horizontally
player.y = 2732 - 520; // Move player even higher up (was 2732 - 420)
game.addChild(player);
// Defensive: always initialize arrays to avoid undefined/null errors
if (typeof obstacles === "undefined" || !obstacles || !Array.isArray(obstacles)) {
	var obstacles = [];
} else if (!Array.isArray(obstacles)) {
	obstacles = [];
}
if (typeof enemyBikes === "undefined" || !enemyBikes || !Array.isArray(enemyBikes)) {
	var enemyBikes = [];
} else if (!Array.isArray(enemyBikes)) {
	enemyBikes = [];
}
if (typeof powerups === "undefined" || !powerups || !Array.isArray(powerups)) {
	var powerups = [];
} else if (!Array.isArray(powerups)) {
	powerups = [];
}
// --- Score ---
var score = 0;
var distance = 0;
// --- Health ---
var playerHealth = 3;
var maxPlayerHealth = 3;
// Container for tire icons
var healthIcons = new Container();
healthIcons.x = 110;
healthIcons.y = 0;
LK.gui.top.addChild(healthIcons);
// Helper to update tire icons
function updateHealthIcons() {
	// Remove all previous icons
	while (healthIcons.children.length > 0) {
		var c = healthIcons.children.pop();
		if (c && typeof c.destroy === "function") {
			c.destroy();
		}
	}
	// Add one tire icon per health
	for (var h = 0; h < playerHealth; h++) {
		var tire = LK.getAsset('tireIcon', {
			anchorX: 0,
			anchorY: 0,
			width: 90,
			height: 90
		});
		tire.x = h * 100;
		tire.y = 10;
		healthIcons.addChild(tire);
	}
}
updateHealthIcons();
// Score display
var scoreTxt = new Text2('0', {
	size: 120,
	fill: "#fff"
});
// Anchor to the right edge, top (1, 0)
scoreTxt.anchor.set(1, 0);
// Add to top-right GUI overlay
LK.gui.topRight.addChild(scoreTxt);
// Now that scoreTxt is defined, set comboText position and add to GUI if not already present
// --- Motocockpit UI (center-bottom, slightly above edge) ---
var motocockpit = LK.getAsset('motocockpit', {
	anchorX: 0.5,
	anchorY: 1
});
motocockpit.x = LK.gui.center.width / 2;
motocockpit.y = 10; // 30px above the bottom edge to avoid clipping
LK.gui.bottom.addChild(motocockpit);
// --- Version Label (bottom-left) ---
var versionLabel = new Text2('v_0.2', {
	size: 48,
	fill: "#fff",
	font: "Arial, Helvetica, sans-serif"
});
versionLabel.anchor.set(0, 1); // left-bottom corner of text
// Position: bottom-left, with a small margin from the edge
versionLabel.x = 40;
versionLabel.y = -20;
LK.gui.bottomLeft.addChild(versionLabel);
// (Punch button removed)
// Touch drag to steer
var dragActive = false;
var dragOffsetX = 0;
game.down = function (x, y, obj) {
	// (Punch logic on right half tap removed)
	// Only start drag if touch is near the player
	var dx = x - player.x;
	var dy = y - player.y;
	if (dx * dx + dy * dy < 300 * 300) {
		dragActive = true;
		dragOffsetX = player.x - x;
	}
};
game.move = function (x, y, obj) {
	if (dragActive) {
		player.x = x + dragOffsetX;
	}
};
game.up = function (x, y, obj) {
	dragActive = false;
};
// --- Spawning logic ---
var obstacleTimer = 0;
var powerupTimer = 0;
// --- Difficulty scaling ---
var enemyBaseSpeed = 24; // initial EnemyBike speed
var enemySpeed = enemyBaseSpeed;
var enemyBaseSpawnInterval = 40; // initial spawn interval (frames)
var enemySpawnInterval = enemyBaseSpawnInterval;
var difficultyTimer = 0; // counts frames for difficulty increase
var difficultyInterval = 600; // every 600 frames (~10s at 60fps), increase difficulty
var enemySpeedIncrement = 2; // how much to increase speed each interval
var enemySpawnDecrement = 4; // how much to decrease spawn interval each interval (minimum capped)
var minEnemySpawnInterval = 12; // minimum allowed spawn interval
// --- KatanaSlash Melee System ---
var katanaSlashCooldown = 0; // frames until next slash (120 frames = 2s at 60fps)
var katanaSlashRadius = 200; // px radius for melee
// --- Main update loop ---
game.update = function () {
	// Scroll road background downward to simulate forward motion
	roadBg1.y += player.speedY;
	roadBg2.y += player.speedY;
	// Loop backgrounds
	if (roadBg1.y >= 2732) {
		roadBg1.y = roadBg2.y - 2732;
	}
	if (roadBg2.y >= 2732) {
		roadBg2.y = roadBg1.y - 2732;
	}
	// Scroll and loop lane lines downward
	for (var i = 0; i < laneLineContainers.length; i++) {
		var lineContainer = laneLineContainers[i];
		for (var j = 0; j < lineContainer.children.length; j++) {
			var dash = lineContainer.children[j];
			dash.y += player.speedY;
			if (dash.y > 2732) {
				dash.y -= (dashHeight + dashGap) * lineContainer.children.length;
				// This ensures the dash loops back to the top
			}
		}
	}
	// Move player (handled in class)
	player.update();
	// Scroll obstacles and powerups
	for (var i = obstacles.length - 1; i >= 0; i--) {
		var obs = obstacles[i];
		obs.update();
		// Remove if off screen (bottom or top or far left/right)
		if (obs.y >= 2732 + 100 || obs.y < -200 || obs.x < -200 || obs.x > 2048 + 200) {
			obs.destroy();
			obstacles.splice(i, 1);
			continue;
		}
		// Collision detection (trigger on first intersect)
		if (!obs.lastWasIntersecting && obs.intersects(player)) {
			// Log game over trigger
			console.log("Game Over Triggered");
			// Check if carcrashsound is loaded
			var carCrashSound = LK.getSound('carcrashsound');
			if (carCrashSound && typeof carCrashSound.play === "function") {
				console.log("carcrashsound loaded successfully");
			} else {
				console.log("carcrashsound not loaded or invalid");
			}
			LK.effects.flashScreen(0xff0000, 800);
			// Immediately stop all sounds and music before delay
			LK.stopMusic();
			// Stop any currently playing katana sound
			if (currentKatanaSound && typeof currentKatanaSound.stop === "function") {
				currentKatanaSound.stop();
			}
			// Stop all other sounds that might be playing
			var testSound = LK.getSound('testSound');
			if (testSound && typeof testSound.stop === "function") {
				testSound.stop();
			}
			var motorCrashSound = LK.getSound('motorcrashsound');
			if (motorCrashSound && typeof motorCrashSound.stop === "function") {
				motorCrashSound.stop();
			}
			var katanaSlashSound = LK.getSound('katanaslashsound');
			if (katanaSlashSound && typeof katanaSlashSound.stop === "function") {
				katanaSlashSound.stop();
			}
			// Play carcrashsound immediately before showing game over
			if (LK.getSound && typeof LK.getSound === "function") {
				var gameOverCrashSound = LK.getSound('carcrashsound');
				if (gameOverCrashSound && typeof gameOverCrashSound.play === "function") {
					gameOverCrashSound.volume = 1.0;
					gameOverCrashSound.play();
					console.log("carcrashsound play triggered");
				}
			}
			// Wait 0.65 seconds after sound starts, then show game over
			LK.setTimeout(function () {
				LK.showGameOver();
			}, 650);
			return;
		}
		obs.lastWasIntersecting = obs.intersects(player);
	}
	// Handle enemyBikes
	for (var i = enemyBikes.length - 1; i >= 0; i--) {
		var eb = enemyBikes[i];
		eb.update();
		// Remove if off screen (bottom or top or far left/right)
		if (eb.y >= 2732 + 100 || eb.y < -200 || eb.x < -200 || eb.x > 2048 + 200) {
			eb.destroy();
			enemyBikes.splice(i, 1);
			// Reset comboCount if enemy escapes
			if (comboCount !== 0) {
				comboCount = 0;
				updateComboText();
			}
			continue;
		}
		// Collision detection (trigger on first intersect)
		if (!eb.lastWasIntersecting && eb.intersects(player)) {
			// Do nothing: enemy motorcycle collision has no effect, no sound, no animation, no feedback
		}
		eb.lastWasIntersecting = eb.intersects(player);
		// (auto-punch logic removed)
	}
	// Powerups
	for (var i = powerups.length - 1; i >= 0; i--) {
		var pu = powerups[i];
		pu.update();
		// Remove if off screen (bottom or top or far left/right)
		if (pu.y >= 2732 + 100 || pu.y < -200 || pu.x < -200 || pu.x > 2048 + 200) {
			pu.destroy();
			powerups.splice(i, 1);
			continue;
		}
		// Collect powerup
		if (!pu.lastWasIntersecting && pu.intersects(player)) {
			// Play chassound immediately upon collection
			var powerUpSound = LK.getSound('chassound');
			if (powerUpSound && typeof powerUpSound.play === "function") {
				powerUpSound.play();
			}
			score += 10;
			scoreTxt.setText(score);
			pu.destroy();
			powerups.splice(i, 1);
			continue;
		}
		pu.lastWasIntersecting = pu.intersects(player);
	}
	// --- Difficulty scaling ---
	difficultyTimer++;
	if (difficultyTimer >= difficultyInterval) {
		difficultyTimer = 0;
		// Increase enemy speed
		enemySpeed += enemySpeedIncrement;
		// Decrease spawn interval, but not below minimum
		enemySpawnInterval -= enemySpawnDecrement;
		if (enemySpawnInterval < minEnemySpawnInterval) {
			enemySpawnInterval = minEnemySpawnInterval;
		}
	}
	// --- Spawning ---
	obstacleTimer++;
	if (obstacleTimer > enemySpawnInterval) {
		obstacleTimer = 0;
		// Randomly decide to spawn an Obstacle or an EnemyBike (e.g. 70% car, 30% enemyBike)
		if (Math.random() < 0.3) {
			var laneIdx = Math.floor(Math.random() * laneCount);
			var eb = new EnemyBike();
			eb.laneIdx = laneIdx; // Store lane index for reference
			eb.x = laneX[laneIdx];
			eb.y = -100;
			eb.lastWasIntersecting = false;
			eb.speedY = enemySpeed; // Set current enemy speed
			game.addChild(eb);
			enemyBikes.push(eb);
		} else {
			var obs = new Obstacle();
			// Place obstacle in a random lane
			var laneIdx = Math.floor(Math.random() * laneCount);
			obs.x = laneX[laneIdx];
			obs.y = -100;
			obs.lastWasIntersecting = false;
			game.addChild(obs);
			obstacles.push(obs);
		}
	}
	powerupTimer++;
	if (powerupTimer > 120) {
		powerupTimer = 0;
		var pu = new PowerUp();
		// Place powerup in a random lane
		var laneIdx = Math.floor(Math.random() * laneCount);
		pu.x = laneX[laneIdx];
		pu.y = -100;
		pu.lastWasIntersecting = false;
		game.addChild(pu);
		powerups.push(pu);
	}
	// --- KatanaSlash Melee System ---
	// Instantly destroy any enemyBike within katanaSlashRadius of the player and show a glowing red beam effect
	var katanaHit = false;
	var katanaKills = 0;
	for (var i = enemyBikes.length - 1; i >= 0; i--) {
		var eb = enemyBikes[i];
		var dx = eb.x - player.x;
		var dy = eb.y - player.y;
		if (dx * dx + dy * dy <= katanaSlashRadius * katanaSlashRadius) {
			katanaHit = true;
			// Draw a katana sprite image between player and enemyBike
			var length = Math.sqrt(dx * dx + dy * dy);
			var angle = Math.atan2(dy, dx);
			// Play katana slash sound
			var katanaSlashSound = LK.getSound('katanaslashsound');
			if (katanaSlashSound && typeof katanaSlashSound.play === "function") {
				katanaSlashSound.play();
			}
			// Use a katana image asset (ensure it's initialized in Assets section)
			var katana = LK.getAsset('katana', {
				anchorX: 0,
				// start of blade at player
				anchorY: 0.5
			});
			katana.x = player.x + 30;
			katana.y = player.y - 20;
			katana.rotation = angle;
			// Scale katana to match the distance between player and enemyBike
			// Use katana's original width for scaling
			if (katana.width > 0) {
				katana.scaleX = length / katana.width;
			} else {
				katana.scaleX = 1;
			}
			katana.scaleY = 1.0; // keep blade thickness
			katana.alpha = 0.92;
			game.addChild(katana);
			// Remove katana after 200ms
			(function (k) {
				var timeoutId = LK.setTimeout(function () {
					if (k && typeof k.destroy === "function") {
						k.destroy();
					}
				}, 200);
			})(katana);
			eb.destroy();
			enemyBikes.splice(i, 1);
			// Award score as 5 * comboCount (minimum 5 if comboCount is 0)
			var awardedCombo = comboCount > 0 ? comboCount : 1;
			score += 5 * awardedCombo;
			scoreTxt.setText(score);
			katanaKills++;
		}
	}
	// Only increment comboCount if at least one enemyBike was killed by katana
	if (katanaKills > 0) {
		comboCount += katanaKills;
		updateComboText();
		playKatanaComboSound();
	}
	// --- Distance/score ---
	distance += player.speedY;
	if (distance % 1000 < player.speedY) {
		score += 1;
		scoreTxt.setText(score);
	}
	// Endless mode: no win condition, game continues until playerHealth reaches zero
};
// Play background music continuously throughout the game
LK.playMusic('gamesound');