Limiting Controllable Camera through Code

I followed this tutorial to make a camera I can control with WASD or by dragging the mouse. Here is the code:

`extends Camera2D

@export var zoomSpeed : float = 9
@export var zoomLimit: float = 4
var zoomTarget: Vector2 = Vector2.ZERO
var moveTarget: Vector2 = Vector2.ZERO

var dragStartMousePos: Vector2 = Vector2.ZERO
var dragStartCameraPos: Vector2 = Vector2.ZERO
var isDragging: bool = false

func _ready():
zoomTarget = zoom
moveTarget = position

func _process(delta):
Zoom(delta)
SimplePan(delta)
ClickAndDrag()

func Zoom(delta):
var zoom_min: Vector2 = Vector2(zoomLimit, zoomLimit)
var zoom_max: Vector2 = Vector2(5.0, 5.0)
if Input.is_action_just_pressed("camera_zoom_in"):
zoomTarget *= 1.1
elif Input.is_action_just_pressed("camera_zoom_out"):
zoomTarget *= 0.9

zoomTarget = clamp(zoomTarget, zoom_min, zoom_max)
zoom = zoom.slerp(zoomTarget, zoomSpeed * delta)

func SimplePan(delta):
var moveAmount = Vector2.ZERO
moveAmount = Input.get_vector("camera_move_left", "camera_move_right", "camera_move_up", "camera_move_down")
moveAmount = moveAmount.normalized()

if !isDragging:
	moveTarget += moveAmount * 15 * 1/zoom.x
	position = position.lerp(moveTarget, 7 * delta)

func ClickAndDrag():
if !isDragging and Input.is_action_just_pressed("camera_pan"):
dragStartMousePos = get_viewport().get_mouse_position()
dragStartCameraPos = position
isDragging = true
if isDragging and Input.is_action_just_released("camera_pan"):
isDragging = false
moveTarget = position

if isDragging:
	var moveVector = get_viewport().get_mouse_position() - dragStartMousePos
	position = dragStartCameraPos - moveVector * 1/zoom.x

func focus_on_object(object):
moveTarget = object.global_position`

Now I'd like to limit the camera to a predefined area, but trying to do so with the built-in limit variables can make it act funky. Any suggestions?