ow can I limit rotating an object that uses the device's rotation?

I would like to know how to limit the rotation of a device when it reaches 45 degrees z and x. When I tilt the device, tilts the object too, but it doesnt stop tilting. Anyone know how to limit it? Since already thank you. Here's my script.

 public Vector3 rotateDir = Vector3.zero;
 public float rotateSpeed = 3.0F;
 
 
 // Update is called once per frame
 void Update() {
 
 rotateDir.x = -Input.acceleration.y;
 rotateDir.z = Input.acceleration.x;
 
 if (rotateDir.sqrMagnitude > 0.3)
 rotateDir.Normalize();
 
 transform.Rotate(rotateDir * rotateSpeed);
 }