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

/**** 
* Classes
****/ 
// Bullet class
var Bullet = Container.expand(function () {
	var self = Container.call(this);
	// Attach bullet asset (yellow box)
	var bulletSprite = self.attachAsset('bullet', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 32;
	self.damage = 1;
	self.update = function () {
		self.x += self.speed;
	};
	return self;
});
// LootBox class
var LootBox = Container.expand(function () {
	var self = Container.call(this);
	// Attach lootbox asset (orange ellipse)
	var lootSprite = self.attachAsset('lootbox', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.type = 'ammo'; // 'ammo', 'medkit', 'money'
	self.value = 1;
	self.speed = 2.5;
	self.update = function () {
		self.x -= self.speed;
	};
	return self;
});
// Player class (stationary)
var Player = Container.expand(function () {
	var self = Container.call(this);
	// Attach player asset (red box)
	var playerSprite = self.attachAsset('player', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	// Gun barrel position (relative to player)
	self.getGunPos = function () {
		// Gun at right edge, center vertically
		return {
			x: self.x + playerSprite.width / 2,
			y: self.y
		};
	};
	return self;
});
// Zombie class
var Zombie = Container.expand(function (style) {
	var self = Container.call(this);
	// Default to style 1 if not provided
	if (typeof style !== "number" || style < 1 || style > 4) style = 1;
	var zombieAssetId = "zombie" + style;
	// Attach zombie asset (varied style)
	var zombieSprite = self.attachAsset(zombieAssetId, {
		anchorX: 0.5,
		anchorY: 1
	});
	// Set up stats
	self.maxHealth = 1;
	self.health = 1;
	self.speed = 2;
	self.reward = 10; // money for killing
	// Health bar
	var healthBar = self.addChild(LK.getAsset('zombieHealthBar', {
		anchorX: 0.5,
		anchorY: 0.5,
		width: 60,
		height: 10,
		color: 0xff0000
	}));
	healthBar.y = -zombieSprite.height + 10;
	// Update health bar
	self.updateHealthBar = function () {
		healthBar.width = 60 * (self.health / self.maxHealth);
	};
	// Called every tick
	self.update = function () {
		self.x -= self.speed;
		// Health bar follows
		self.updateHealthBar();
	};
	return self;
});

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

/**** 
* Game Code
****/ 
// --- Asset Initialization ---
// Add background image (centered, covers full game area)
var background = LK.getAsset('background', {
	anchorX: 0.5,
	anchorY: 0.5,
	x: 2048 / 2,
	y: 2732 / 2,
	width: 2048,
	height: 2732
});
game.addChild(background);
// --- Game State ---
var player = null;
var bullets = [];
var zombies = [];
var lootboxes = [];
var ammo = 10;
var maxAmmo = 10;
var health = 5;
var maxHealth = 5;
var level = 1;
var zombiesToSpawn = 0;
var zombiesSpawned = 0;
var zombiesKilled = 0;
var spawnTimer = 0;
var reloadTimer = 0;
var isReloading = false;
var weaponIndex = 0;
// --- Zombie Speed Scaling ---
var zombieBaseSpeedMin = 2.0;
var zombieBaseSpeedMax = 2.5;
var zombieSpeedIncreasePerMinute = 0.5; // total increase per minute
var zombieMaxSpeed = 4.0; // maximum allowed zombie speed
var gameStartTick = null; // will be set at game start
var weapons = [{
	name: "Pistol",
	damage: 1,
	ammo: 20,
	// doubled from 10
	reload: 60,
	bulletSpeed: 18,
	color: 0xf7e12b
}, {
	name: "SMG",
	damage: 1,
	ammo: 40,
	// doubled from 20
	reload: 40,
	bulletSpeed: 20,
	color: 0x00bfff
}, {
	name: "Shotgun",
	damage: 3,
	ammo: 10,
	// doubled from 5
	reload: 90,
	bulletSpeed: 14,
	color: 0xffffff
}];
var unlockedWeapons = 1; // Start with 1 weapon
// --- UI Elements ---
// Weapon name text (top center, above score)
var weaponNameTxt = new Text2('', {
	size: 70,
	fill: "#fff"
});
weaponNameTxt.anchor.set(0.5, 1);
weaponNameTxt.x = LK.gui.top.width / 2;
weaponNameTxt.y = 0;
LK.gui.top.addChild(weaponNameTxt);
var scoreTxt = new Text2('Score: 0', {
	size: 100,
	fill: "#fff"
});
// Place score at true top center
scoreTxt.anchor.set(0.5, 0);
// Position: top center
scoreTxt.x = LK.gui.top.width / 2;
scoreTxt.y = 0;
LK.gui.top.addChild(scoreTxt);
// Animate score color as rainbow using tween plugin
var rainbowColors = [0xFF0000,
// red
0xFF7F00,
// orange
0xFFFF00,
// yellow
0x00FF00,
// green
0x0000FF,
// blue
0x4B0082,
// indigo
0x9400D3 // violet
];
var rainbowIndex = 0;
function animateScoreColor() {
	var nextIndex = (rainbowIndex + 1) % rainbowColors.length;
	var fromColor = rainbowColors[rainbowIndex];
	var toColor = rainbowColors[nextIndex];
	// Animate over 400ms for smooth transition
	tween.to(scoreTxt, {
		tint: toColor
	}, 400, {
		onStart: function onStart() {
			scoreTxt.tint = fromColor;
		},
		onUpdate: function onUpdate(obj) {
			// tween plugin will update .tint property
		},
		onComplete: function onComplete() {
			rainbowIndex = nextIndex;
			animateScoreColor();
		}
	});
}
animateScoreColor();
// Money UI removed
var ammoTxt = new Text2('Ammo: 10 / 10', {
	size: 60,
	fill: "#fff"
});
ammoTxt.anchor.set(0, 0);
LK.gui.bottomLeft.addChild(ammoTxt);
// Bullet count text (numbers)
var bulletCountTxt = new Text2('Bullets: 10', {
	size: 60,
	fill: 0xFFFF00
});
// Anchor bottom right
bulletCountTxt.anchor.set(1, 1);
// Place at right bottom of the screen (HUD)
bulletCountTxt.x = LK.gui.bottomRight.width;
bulletCountTxt.y = LK.gui.bottomRight.height;
LK.gui.bottomRight.addChild(bulletCountTxt);
var healthTxt = new Text2('♥♥♥♥♥', {
	size: 100,
	fill: 0xFF4D4D
});
healthTxt.anchor.set(0, 1);
healthTxt.x = 20;
healthTxt.y = -10;
LK.gui.bottomLeft.addChild(healthTxt);
// --- Helper Functions ---
function updateUI() {
	scoreTxt.setText('Score: ' + zombiesKilled);
	ammoTxt.setText('Ammo: ' + ammo + ' / ' + maxAmmo);
	bulletCountTxt.setText('Bullets: ' + ammo);
	var hearts = '';
	for (var i = 0; i < health; i++) hearts += '♥';
	for (var i = health; i < maxHealth; i++) hearts += '♡';
	healthTxt.setText(hearts);
	// Show weapon name
	if (weapons && weapons[weaponIndex]) {
		weaponNameTxt.setText(weapons[weaponIndex].name);
	} else {
		weaponNameTxt.setText('');
	}
}
function startLevel(lvl) {
	// No level or wave logic needed
	zombiesKilled = 0;
	spawnTimer = 0;
}
function spawnZombie() {
	// Pick a random zombie style (1-4)
	var zombieStyle = 1 + Math.floor(Math.random() * 4);
	var z = new Zombie(zombieStyle);
	// Position at right edge, random y
	z.x = 2048 + 80;
	z.y = 400 + Math.floor(Math.random() * (2732 - 800));
	// Set fixed health and slow speed for zombies (health halved)
	z.maxHealth = 1.5;
	z.health = z.maxHealth;
	// --- Calculate elapsed minutes since game start ---
	var elapsedTicks = gameStartTick !== null ? LK.ticks - gameStartTick : 0;
	var elapsedMinutes = elapsedTicks / (60 * 60); // 60 ticks per second * 60 seconds
	// --- Calculate speed increase ---
	var speedIncrease = zombieSpeedIncreasePerMinute * elapsedMinutes;
	var minSpeed = zombieBaseSpeedMin + speedIncrease;
	var maxSpeed = zombieBaseSpeedMax + speedIncrease;
	// --- Clamp to max speed ---
	if (minSpeed > zombieMaxSpeed) minSpeed = zombieMaxSpeed;
	if (maxSpeed > zombieMaxSpeed) maxSpeed = zombieMaxSpeed;
	// --- Assign speed within range ---
	z.speed = minSpeed + Math.random() * (maxSpeed - minSpeed);
	zombies.push(z);
	game.addChild(z);
}
function spawnLootBox(x, y) {
	var loot = new LootBox();
	loot.x = x;
	loot.y = y;
	// Randomize type
	var r = Math.random();
	if (r < 0.5) {
		loot.type = 'ammo';
		loot.value = 5 + Math.floor(Math.random() * 5);
	} else {
		loot.type = 'medkit';
		loot.value = 1;
	}
	lootboxes.push(loot);
	game.addChild(loot);
}
// --- Game Setup ---
player = new Player();
player.x = 180;
player.y = 2732 / 2;
game.addChild(player);
// --- Input Handling ---
var lastShotTick = 0;
var dragNode = null;
// Mouse/touch move: aim gun
game.move = function (x, y, obj) {
	// No drag, just aiming
	// Optionally, could rotate gun sprite, but for now, just use for shooting
};
// Mouse/touch down: shoot
game.down = function (x, y, obj) {
	// Only shoot if not reloading
	if (isReloading) return;
	if (ammo <= 0) {
		// Start reload
		isReloading = true;
		reloadTimer = 0;
		return;
	}
	// Fire bullet
	var gunPos = player.getGunPos();
	var b = new Bullet();
	b.x = gunPos.x;
	b.y = gunPos.y;
	// Aim: calculate angle to (x, y)
	var dx = x - gunPos.x;
	var dy = y - gunPos.y;
	var dist = Math.sqrt(dx * dx + dy * dy);
	if (dist === 0) dist = 1;
	b.speed = weapons[weaponIndex].bulletSpeed;
	b.damage = weapons[weaponIndex].damage;
	// Set bullet direction
	b.vx = b.speed * (dx / dist);
	b.vy = b.speed * (dy / dist);
	// Overwrite update to use vx/vy
	b.update = function () {
		b.x += b.vx;
		b.y += b.vy;
	};
	bullets.push(b);
	game.addChild(b);
	ammo--;
	updateUI();
};
// Mouse/touch up: nothing
game.up = function (x, y, obj) {};
// --- Weapon Switching removed (no weapon name or tap to switch) ---
// --- Main Game Loop ---
game.update = function () {
	// --- Spawning zombies continuously ---
	spawnTimer++;
	if (spawnTimer > 55) {
		spawnZombie();
		spawnTimer = 0;
	}
	// --- Bullets update ---
	for (var i = bullets.length - 1; i >= 0; i--) {
		var b = bullets[i];
		b.update();
		// Remove if off screen
		if (b.x > 2048 + 100 || b.y < -100 || b.y > 2732 + 100) {
			b.destroy();
			bullets.splice(i, 1);
			continue;
		}
		// Check collision with zombies
		var bulletDestroyed = false;
		for (var j = zombies.length - 1; j >= 0; j--) {
			var z = zombies[j];
			if (b.intersects(z)) {
				z.health -= b.damage;
				if (z.health <= 0) {
					// Zombie dies
					zombiesKilled++;
					// Only spawn a lootbox 30% of the time
					if (Math.random() < 0.3) {
						spawnLootBox(z.x, z.y - 40);
					}
					z.destroy();
					zombies.splice(j, 1);
				}
				b.destroy();
				bullets.splice(i, 1);
				bulletDestroyed = true;
				break;
			}
		}
		if (bulletDestroyed) continue;
		// Check collision with lootboxes (shoot to open)
		for (var k = lootboxes.length - 1; k >= 0; k--) {
			var l = lootboxes[k];
			if (b.intersects(l)) {
				// Open lootbox and grant reward
				if (l.type === 'ammo') {
					ammo += l.value;
					if (ammo > maxAmmo) ammo = maxAmmo;
				} else if (l.type === 'medkit') {
					health += l.value;
					if (health > maxHealth) health = maxHealth;
				}
				// Increase score when shooting and opening a lootbox
				zombiesKilled++;
				l.destroy();
				lootboxes.splice(k, 1);
				b.destroy();
				bullets.splice(i, 1);
				bulletDestroyed = true;
				break;
			}
		}
		if (bulletDestroyed) continue;
	}
	// --- Zombies update ---
	for (var i = zombies.length - 1; i >= 0; i--) {
		var z = zombies[i];
		z.update();
		// If zombie reaches player
		if (z.x < player.x + 60) {
			// Damage player (reduced by half)
			health -= 0.5;
			LK.effects.flashObject(player, 0xff0000, 400);
			z.destroy();
			zombies.splice(i, 1);
			if (health <= 0) {
				LK.effects.flashScreen(0xff0000, 1000);
				LK.showGameOver();
				return;
			}
		}
	}
	// --- Lootboxes update ---
	for (var i = lootboxes.length - 1; i >= 0; i--) {
		var l = lootboxes[i];
		l.update();
		// If off screen
		if (l.x < -100) {
			l.destroy();
			lootboxes.splice(i, 1);
			continue;
		}
		// No automatic pickup; lootboxes must be shot to open
	}
	// --- Reloading ---
	if (isReloading) {
		reloadTimer++;
		if (reloadTimer > weapons[weaponIndex].reload) {
			isReloading = false;
			ammo = maxAmmo;
			updateUI();
		}
	}
	// No level progression or waves
	updateUI();
};
// --- Start Game ---
ammo = weapons[weaponIndex].ammo;
maxAmmo = weapons[weaponIndex].ammo;
health = maxHealth;
zombiesKilled = 0;
unlockedWeapons = 1;
weaponIndex = 0;
gameStartTick = LK.ticks; // Track when the game started for zombie speed scaling
startLevel(1);
updateUI();

===================================================================
--- original.js
+++ change.js
@@ -182,8 +182,45 @@
 // Position: top center
 scoreTxt.x = LK.gui.top.width / 2;
 scoreTxt.y = 0;
 LK.gui.top.addChild(scoreTxt);
+// Animate score color as rainbow using tween plugin
+var rainbowColors = [0xFF0000,
+// red
+0xFF7F00,
+// orange
+0xFFFF00,
+// yellow
+0x00FF00,
+// green
+0x0000FF,
+// blue
+0x4B0082,
+// indigo
+0x9400D3 // violet
+];
+var rainbowIndex = 0;
+function animateScoreColor() {
+	var nextIndex = (rainbowIndex + 1) % rainbowColors.length;
+	var fromColor = rainbowColors[rainbowIndex];
+	var toColor = rainbowColors[nextIndex];
+	// Animate over 400ms for smooth transition
+	tween.to(scoreTxt, {
+		tint: toColor
+	}, 400, {
+		onStart: function onStart() {
+			scoreTxt.tint = fromColor;
+		},
+		onUpdate: function onUpdate(obj) {
+			// tween plugin will update .tint property
+		},
+		onComplete: function onComplete() {
+			rainbowIndex = nextIndex;
+			animateScoreColor();
+		}
+	});
+}
+animateScoreColor();
 // Money UI removed
 var ammoTxt = new Text2('Ammo: 10 / 10', {
 	size: 60,
 	fill: "#fff"