local player = game.Players.LocalPlayer
local character = player.Character or player.CharacterAdded:Wait()
local humanoid = character:WaitForChild("Humanoid")
local hrp = character:WaitForChild("HumanoidRootPart")
local cam = workspace.CurrentCamera
local uis = game:GetService("UserInputService")
local runService = game:GetService("RunService")
local debris = game:GetService("Debris")

humanoid.CameraOffset = Vector3.new(0, 0, 0)
humanoid.AutoRotate = true
humanoid.RequiresNeck = false

uis.InputChanged:Connect(function()
	if cam.CameraSubject == humanoid and cam.FieldOfView <= 70 then
		for _, part in pairs(character:GetChildren()) do
			if part:IsA("BasePart") then
				part.LocalTransparencyModifier = 0
			end
		end
	end
end)

local gui = Instance.new("ScreenGui", game.CoreGui)
gui.ResetOnSpawn = false

local function makeButton(name, text, pos)
	local b = Instance.new("TextButton", gui)
	b.Name = name
	b.Size = UDim2.new(0, 100, 0, 40)
	b.Position = pos
	b.Text = text
	b.Font = Enum.Font.SourceSansBold
	b.TextSize = 18
	b.TextColor3 = Color3.new(1, 1, 1)
	b.BackgroundColor3 = Color3.fromRGB(70, 70, 70)
	Instance.new("UICorner", b).CornerRadius = UDim.new(0, 8)
	return b
end

local sprintBtn = makeButton("Sprint", "Sprint", UDim2.new(1, -230, 1, -100))
local crouchBtn = makeButton("Crouch", "Crouch", UDim2.new(1, -120, 1, -160))

local crouchAnim = Instance.new("Animation")
crouchAnim.AnimationId = "rbxassetid://287325678"
local crouchTrack

local sprinting = false
local crouching = false
local sprintSpeed = 25
local sprintTimer = 0
local tripReady = false
local bumpCooldown = false

local originalSizes = {}
local function shrinkChar()
	for _, part in character:GetChildren() do
		if part:IsA("BasePart") and (part.Name:find("Torso") or part.Name == "HumanoidRootPart") then
			originalSizes[part] = part.Size
			part.Size = part.Size * Vector3.new(1, 0.5, 1)
		end
	end
	for _, part in character:GetChildren() do
		if part:IsA("BasePart") and part.Name ~= "HumanoidRootPart" then
			part.CanCollide = false
		end
	end
end

local function restoreChar()
	for part, size in pairs(originalSizes) do
		if part then part.Size = size end
	end
	for _, part in character:GetChildren() do
		if part:IsA("BasePart") then
			part.CanCollide = true
		end
	end
end

local function updateMovement()
	if sprinting then
		humanoid.WalkSpeed = sprintSpeed
		sprintBtn.BackgroundColor3 = Color3.fromRGB(30, 30, 30)
		crouchBtn.BackgroundColor3 = Color3.fromRGB(70, 70, 70)
		if crouchTrack then crouchTrack:Stop() end
		restoreChar()
	elseif crouching then
		humanoid.WalkSpeed = 10
		crouchBtn.BackgroundColor3 = Color3.fromRGB(30, 30, 30)
		sprintBtn.BackgroundColor3 = Color3.fromRGB(70, 70, 70)
		crouchTrack = humanoid:LoadAnimation(crouchAnim)
		crouchTrack:Play()
		shrinkChar()
	else
		humanoid.WalkSpeed = 16
		sprintBtn.BackgroundColor3 = Color3.fromRGB(70, 70, 70)
		crouchBtn.BackgroundColor3 = Color3.fromRGB(70, 70, 70)
		if crouchTrack then crouchTrack:Stop() end
		restoreChar()
	end
end

sprintBtn.MouseButton1Click:Connect(function()
	if not sprinting then
		sprinting = true
		crouching = false
	else
		sprinting = false
	end
	sprintSpeed = 25
	sprintTimer = 0
	updateMovement()
end)

crouchBtn.MouseButton1Click:Connect(function()
	if not crouching then
		crouching = true
		sprinting = false
	else
		crouching = false
	end
	updateMovement()
end)

runService.RenderStepped:Connect(function(dt)
	if sprinting then
		sprintTimer += dt
		if sprintTimer >= 1 and sprintSpeed < 40 then
			sprintSpeed += 1
			sprintTimer = 0
			humanoid.WalkSpeed = sprintSpeed
		end
	end
end)

hrp.Touched:Connect(function(hit)
	if not hit:IsDescendantOf(character) and not bumpCooldown then
		bumpCooldown = true

		local tilt = Instance.new("BodyGyro", hrp)
		tilt.MaxTorque = Vector3.new(400000, 0, 400000)
		tilt.CFrame = hrp.CFrame * CFrame.Angles(0, 0, math.rad(math.random(-20, 20)))
		debris:AddItem(tilt, 0.3)

		if sprinting and sprintSpeed >= 40 then
			local bv = Instance.new("BodyVelocity", hrp)
			bv.MaxForce = Vector3.new(1e5, 0, 1e5)
			bv.Velocity = -hrp.CFrame.LookVector * 30
			debris:AddItem(bv, 0.2)
			humanoid:ChangeState(Enum.HumanoidStateType.FallingDown)
		end

		wait(0.4)
		bumpCooldown = false
	end
end)

player.CharacterAdded:Connect(function(char)
	character = char
	humanoid = char:WaitForChild("Humanoid")
	hrp = char:WaitForChild("HumanoidRootPart")
	sprinting, crouching = false, false
	sprintSpeed = 25
	sprintTimer = 0
	updateMovement()
end)