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

local player = Players.LocalPlayer
local camera = workspace.CurrentCamera

local screenGui = Instance.new("ScreenGui")
screenGui.Name = "FakeShiftlockUI"
screenGui.ResetOnSpawn = false
screenGui.IgnoreGuiInset = true
screenGui.Parent = player:WaitForChild("PlayerGui")

local button = Instance.new("TextButton")
button.Name = "ShiftlockToggle"
button.Size = UDim2.new(0, 130, 0, 50)
button.Position = UDim2.new(0.5, -65, 1, -90)
button.AnchorPoint = Vector2.new(0.5, 1)
button.BackgroundColor3 = Color3.fromRGB(30, 30, 30)
button.TextColor3 = Color3.fromRGB(255, 255, 255)
button.Font = Enum.Font.GothamBold
button.TextSize = 17
button.Text = "Shiftlock: OFF"
button.Parent = screenGui

local corner = Instance.new("UICorner")
corner.CornerRadius = UDim.new(0, 14)
corner.Parent = button

local stroke = Instance.new("UIStroke")
stroke.Thickness = 2
stroke.Color = Color3.fromRGB(80, 80, 80)
stroke.ApplyStrokeMode = Enum.ApplyStrokeMode.Border
stroke.Parent = button

-- crosshair
local crosshair = Instance.new("Frame")
crosshair.Name = "Crosshair"
crosshair.Size = UDim2.new(0, 6, 0, 6)
crosshair.Position = UDim2.new(0.5, 0, 0.5, 0)
crosshair.AnchorPoint = Vector2.new(0.5, 0.5)
crosshair.BackgroundColor3 = Color3.fromRGB(255, 255, 255)
crosshair.BackgroundTransparency = 0
crosshair.Visible = false
crosshair.ZIndex = 10
crosshair.Parent = screenGui

local crossCorner = Instance.new("UICorner")
crossCorner.CornerRadius = UDim.new(1, 0)
crossCorner.Parent = crosshair

-- draggable with tween smoothing
local dragging, dragInput, dragStart, startPos
local function updateDrag(input)
	local delta = input.Position - dragStart
	local newPos = UDim2.new(
		startPos.X.Scale, startPos.X.Offset + delta.X,
		startPos.Y.Scale, startPos.Y.Offset + delta.Y
	)
	TweenService:Create(button, TweenInfo.new(0.12, Enum.EasingStyle.Quad, Enum.EasingDirection.Out), {Position = newPos}):Play()
end

button.InputBegan:Connect(function(input)
	if input.UserInputType == Enum.UserInputType.MouseButton1 or input.UserInputType == Enum.UserInputType.Touch then
		dragging = true
		dragStart = input.Position
		startPos = button.Position
		input.Changed:Connect(function()
			if input.UserInputState == Enum.UserInputState.End then
				dragging = false
			end
		end)
	end
end)

button.InputChanged:Connect(function(input)
	if input.UserInputType == Enum.UserInputType.MouseMovement or input.UserInputType == Enum.UserInputType.Touch then
		dragInput = input
	end
end)

UserInputService.InputChanged:Connect(function(input)
	if input == dragInput and dragging then
		updateDrag(input)
	end
end)

-- shiftlock system
local shiftlockEnabled = false
local connection

local function setShiftlock(state)
	shiftlockEnabled = state

	-- always clear old connection
	if connection then
		connection:Disconnect()
		connection = nil
	end

	if shiftlockEnabled then
		button.Text = "Shiftlock: ON"
		crosshair.Visible = true
		UserInputService.MouseBehavior = Enum.MouseBehavior.LockCenter

		connection = RunService.RenderStepped:Connect(function()
			local character = player.Character
			local root = character and character:FindFirstChild("HumanoidRootPart")
			if root then
				local camCF = camera.CFrame
				root.CFrame = CFrame.new(root.Position, Vector3.new(
					camCF.LookVector.X + root.Position.X,
					root.Position.Y,
					camCF.LookVector.Z + root.Position.Z
				))
			end
		end)
	else
		button.Text = "Shiftlock: OFF"
		crosshair.Visible = false
		UserInputService.MouseBehavior = Enum.MouseBehavior.Default
	end
end

button.MouseButton1Click:Connect(function()
	setShiftlock(not shiftlockEnabled)
end)

UserInputService.InputBegan:Connect(function(input, gpe)
	if gpe then return end
	if input.KeyCode == Enum.KeyCode.LeftShift then
		setShiftlock(not shiftlockEnabled)
	end
end)

-- respawn safety
player.CharacterAdded:Connect(function()
	if connection then
		connection:Disconnect()
		connection = nil
	end
	if shiftlockEnabled then
		task.wait(0.2)
		setShiftlock(true)
	else
		crosshair.Visible = false
	end
end)