Fastest with effect

-- LocalScript
-- Boost Button Rounded + Animated In/Out + Lightning Particle on Feet

local Players = game:GetService("Players")
local RunService = game:GetService("RunService")
local TweenService = game:GetService("TweenService")
local UserInputService = game:GetService("UserInputService")
local SoundService = game:GetService("SoundService")

local player = Players.LocalPlayer
local character = player.Character or player.CharacterAdded:Wait()
local humanoid = character:WaitForChild("Humanoid")
local root = character:WaitForChild("HumanoidRootPart")

-- Cari part kaki, fallback ke root
local leftFoot = character:FindFirstChild("LeftFoot")
local rightFoot = character:FindFirstChild("RightFoot")

-- === Konfigurasi awal ===
local BASE_MAX_SPEED = 100
local BASE_ACCEL = 60
local BASE_FRICTION = 100
local FRICTION_SCALE = 10
local TURN_SMOOTHNESS = 5
local ROTATE_SPEED = 20

-- Boost config
local BOOST_MULTIPLIER = 10
local BOOST_ACCEL_MULTIPLIER = 10
local BOOST_COOLDOWN = 5 -- detik

-- Variabel runtime
local MAX_SPEED = BASE_MAX_SPEED
local ACCELERATION = BASE_ACCEL
local currentSpeed = 0
local moveVector = Vector3.new(0,0,1)
local canBoost = true
local cooldownActive = false

-- Nonaktifkan kontrol default
humanoid.WalkSpeed = 0
humanoid.AutoRotate = false

-- === GUI BOOST ===
local screenGui = Instance.new("ScreenGui", player:WaitForChild("PlayerGui"))

local boostButton = Instance.new("TextButton")
boostButton.Size = UDim2.new(0, 200, 0, 50)
boostButton.Position = UDim2.new(0.5, -100, 1, 0) -- start di bawah layar
boostButton.BackgroundColor3 = Color3.fromRGB(0,0,0)
boostButton.TextColor3 = Color3.new(1,1,1)
boostButton.TextScaled = true
boostButton.Text = "BOOST!"
boostButton.BackgroundTransparency = 1 -- start invisible
boostButton.Parent = screenGui

-- Biar bundar
local corner = Instance.new("UICorner")
corner.CornerRadius = UDim.new(0, 20) -- radius bundar
corner.Parent = boostButton

-- Bar cooldown
local cooldownBar = Instance.new("Frame")
cooldownBar.Size = UDim2.new(0,200,0,10)
cooldownBar.Position = UDim2.new(0.5, -100, 0.8, 55)
cooldownBar.BackgroundColor3 = Color3.fromRGB(80,80,80)
cooldownBar.BorderSizePixel = 0
cooldownBar.Visible = false
cooldownBar.Parent = screenGui

local barFill = Instance.new("Frame")
barFill.Size = UDim2.new(1,0,1,0)
barFill.BackgroundColor3 = Color3.fromRGB(200, 50, 50) -- merah
barFill.BorderSizePixel = 0
barFill.Parent = cooldownBar

local timerLabel = Instance.new("TextLabel")
timerLabel.Size = UDim2.new(0,200,0,30)
timerLabel.Position = UDim2.new(0.5, -100, 0.8, 70)
timerLabel.BackgroundTransparency = 1
timerLabel.TextColor3 = Color3.new(1,1,1)
timerLabel.TextScaled = true
timerLabel.Text = ""
timerLabel.Visible = false
timerLabel.Parent = screenGui

-- Animasi Fade + Slide
local function animateIn()
	boostButton.Visible = true
	local tween = TweenService:Create(
		boostButton,
		TweenInfo.new(0.6, Enum.EasingStyle.Quad, Enum.EasingDirection.Out),
		{Position = UDim2.new(0.5, -100, 0.8, 0), BackgroundTransparency = 0}
	)
	tween:Play()
end

local function animateOut()
	local tween = TweenService:Create(
		boostButton,
		TweenInfo.new(0.5, Enum.EasingStyle.Quad, Enum.EasingDirection.In),
		{Position = UDim2.new(0.5, -100, 1, 0), BackgroundTransparency = 1}
	)
	tween:Play()
	tween.Completed:Connect(function()
		boostButton.Visible = false
	end)
end

-- Flash efek
local flash = Instance.new("Frame")
flash.Size = UDim2.new(1,0,1,0)
flash.BackgroundColor3 = Color3.fromRGB(255, 255, 0)
flash.BackgroundTransparency = 1
flash.ZIndex = 10
flash.Parent = screenGui

-- Sound efek
local boostSound = Instance.new("Sound")
boostSound.SoundId = "rbxassetid://120714138513879" -- contoh sound
boostSound.Volume = 1
boostSound.Parent = SoundService

local function playFlash()
	flash.BackgroundTransparency = 0.2
	local tween = TweenService:Create(
		flash,
		TweenInfo.new(0.5, Enum.EasingStyle.Quad, Enum.EasingDirection.Out),
		{BackgroundTransparency = 1}
	)
	tween:Play()
end

-- === BOOST FUNCTION ===
local function activateBoost()
	if not canBoost or cooldownActive then return end
	canBoost = false
	cooldownActive = true
	animateOut()

	-- Efek boost
	MAX_SPEED = BASE_MAX_SPEED * BOOST_MULTIPLIER
	ACCELERATION = BASE_ACCEL * BOOST_ACCEL_MULTIPLIER

	-- FX
	boostSound:Play()
	playFlash()

	-- === Cooldown UI ===
	cooldownBar.Visible = true
	timerLabel.Visible = true
	barFill.Size = UDim2.new(1,0,1,0)

	local cooldownTime = BOOST_COOLDOWN
	local startTime = tick()

	task.spawn(function()
		while tick() - startTime < cooldownTime do
			local remaining = math.ceil(cooldownTime - (tick() - startTime))
			timerLabel.Text = tostring(remaining).."s"
			barFill.Size = UDim2.new((cooldownTime - (tick() - startTime)) / cooldownTime, 0, 1, 0)
			RunService.RenderStepped:Wait()
		end

		-- Reset UI
		timerLabel.Visible = false
		cooldownBar.Visible = false

		canBoost = true
		cooldownActive = false
		animateIn()
	end)
end

boostButton.MouseButton1Click:Connect(activateBoost)
UserInputService.InputBegan:Connect(function(input, gp)
	if gp then return end
	if input.KeyCode == Enum.KeyCode.B then
		activateBoost()
	end
end)

-- === PARTICLE LIGHTNING SETUP ===
local function createLightningParticle()
	local particle = Instance.new("ParticleEmitter")
	particle.Name = "LightningParticle"
	particle.Texture = "rbxassetid://348501325"  -- tekstur petir
	particle.LightEmission = 1
	particle.Color = ColorSequence.new(Color3.fromRGB(255, 255, 255), Color3.fromRGB(128, 128, 255))
	particle.Rate = 15
	particle.Lifetime = NumberRange.new(0.2, 0.4)
	particle.Speed = NumberRange.new(0, 0)
	particle.Rotation = NumberRange.new(0, 360)
	particle.RotSpeed = NumberRange.new(-180, 180)
	particle.Size = NumberSequence.new({NumberSequenceKeypoint.new(0, 0.5), NumberSequenceKeypoint.new(1, 0)})
	particle.Transparency = NumberSequence.new({NumberSequenceKeypoint.new(0, 0), NumberSequenceKeypoint.new(1, 1)})
	particle.LockedToPart = true
	particle.EmissionDirection = Enum.NormalId.Bottom
	return particle
end

-- Pasang particle ke kaki, fallback ke HumanoidRootPart
if leftFoot and rightFoot then
	local leftParticle = createLightningParticle()
	leftParticle.Parent = leftFoot
	local rightParticle = createLightningParticle()
	rightParticle.Parent = rightFoot
else
	-- Kalau nggak ada kaki, pasang ke HumanoidRootPart
	local fallbackParticle = createLightningParticle()
	fallbackParticle.Parent = root
end

-- === MOVEMENT LOOP ===
RunService.RenderStepped:Connect(function(dt)
	local inputDir = humanoid.MoveDirection

	if inputDir.Magnitude > 0 then
		-- Percepat
		currentSpeed = math.min(currentSpeed + ACCELERATION * dt, MAX_SPEED)
		moveVector = moveVector:Lerp(inputDir.Unit, TURN_SMOOTHNESS * dt).Unit
	else
		-- Reset accel & max speed ke nilai awal
		MAX_SPEED = BASE_MAX_SPEED
		ACCELERATION = BASE_ACCEL

		-- Gesekan
		local dynamicFriction = BASE_FRICTION + (currentSpeed / FRICTION_SCALE) * 20
		currentSpeed = math.max(currentSpeed - dynamicFriction * dt, 0)
	end

	-- Kalau masih ada speed → tetap jalan
	if currentSpeed > 0 and moveVector.Magnitude > 0 then
		root.AssemblyLinearVelocity = Vector3.new(
			moveVector.X * currentSpeed,
			root.AssemblyLinearVelocity.Y,
			moveVector.Z * currentSpeed
		)

		-- Rotasi ke arah movement
		local lookDir = Vector3.new(moveVector.X, 0, moveVector.Z).Unit
		local targetCFrame = CFrame.lookAt(root.Position, root.Position + lookDir)
		root.CFrame = root.CFrame:Lerp(targetCFrame, ROTATE_SPEED * dt)
	else
		-- Tetap kasih friction stop
		root.AssemblyLinearVelocity = Vector3.new(
			0,
			root.AssemblyLinearVelocity.Y,
			0
		)
	end
end)

-- Pertama kali animasi masuk
animateIn()