local Players = game:GetService("Players")
local UIS = game:GetService("UserInputService")

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

local SHIFT_KEY = Enum.KeyCode.LeftShift
local OFFSET = Vector3.new(1.75, 0, 0)

local enabled = false
local humanoid

local function getHumanoid()
	local char = player.Character or player.CharacterAdded:Wait()
	humanoid = char:WaitForChild("Humanoid")
end

getHumanoid()
player.CharacterAdded:Connect(getHumanoid)

local function enableShiftLock()
	enabled = true
	UIS.MouseBehavior = Enum.MouseBehavior.LockCenter
	humanoid.AutoRotate = false
	humanoid.CameraOffset = OFFSET
end

local function disableShiftLock()
	enabled = false
	UIS.MouseBehavior = Enum.MouseBehavior.Default
	humanoid.AutoRotate = true
	humanoid.CameraOffset = Vector3.zero
end

UIS.InputBegan:Connect(function(input, gpe)
	if gpe then return end
	if input.KeyCode == SHIFT_KEY then
		if enabled then
			disableShiftLock()
		else
			enableShiftLock()
		end
	end
end)

game:GetService("RunService").RenderStepped:Connect(function()
	if enabled and humanoid then
		local root = humanoid.RootPart
		if root then
			root.CFrame = CFrame.new(
				root.Position,
				root.Position + Vector3.new(camera.CFrame.LookVector.X, 0, camera.CFrame.LookVector.Z)
			)
		end
	end
end)