i am tying to build a fps controller from scratch and cant seem to get him to look up or down

[RequireComponent(typeof(Rigidbody))] public class Movement : MonoBehaviour { [SerializeField] private Camera Cam;

 Rigidbody rb;
 private Vector3 velocity = Vector3.zero;
 private Vector3 rotation = Vector3.zero;
 //private Vector3 camreaRotation = Vector3.zero;
 private float camreaRotationX = 0f;
 private float currentcamreaRotationX = 0f;

 [SerializeField]
 private float cameraRotationLimit = 85f; 

 private void Start()
 {
     rb = GetComponent<Rigidbody>();
 }
 // Gets a movement vector
 public void Mov(Vector3 _velocity)
 {
     velocity = _velocity;
 }
 //get a rotational vector
 public void Rotate(Vector3 _rotation)
 {
     rotation = _rotation;
 }

 //get a rotational vector for cam
 public void RotateCamera(float _camreaRotationX)
 {
     camreaRotationX = _camreaRotationX;
 }

 //runs all Physics
 private void FixedUpdate()
 {
     PerformMovement();
     PerformRotation();
 }

 void PerformMovement()
 {
     if (velocity != Vector3.zero)
     {
         rb.MovePosition(rb.position + velocity * Time.fixedDeltaTime);
     }

 }

 void PerformRotation()
 {
     rb.MoveRotation(rb.rotation * Quaternion.Euler(rotation));
     if (Cam != null)
     {
         // Set our rotation and clamp it
         currentcamreaRotationX -= camreaRotationX;
         currentcamreaRotationX = Mathf.Clamp(currentcamreaRotationX, -cameraRotationLimit, cameraRotationLimit);

         //Apply our rotation to the transform of our camera
         Cam.transform.localEulerAngles = new Vector3(currentcamreaRotationX, 0f, 0f);

         //Cam.transform.Rotate(-camreaRotation);
     }
 }

}

Player Controller

[RequireComponent(typeof(Movement))] public class PlayerController : MonoBehaviour { [SerializeField] private float Movespeed = 10.0f; [SerializeField] private float LookSens = 10.0f;

 private Movement Motor;

 private void Start()
 {
     Motor = GetComponent<Movement>();
 }

 private void Update()
 {
     //lock cursor to center of screen press Esc to escape  
     Cursor.lockState = CursorLockMode.Locked;

     //calculate movement Velocity as 3D vector
     float xMov = Input.GetAxisRaw("Horizontal");
     float zmov = Input.GetAxisRaw("Vertical");

     Vector3 MovHoriz = transform.right * xMov;
     Vector3 MovVert = transform.forward * zmov;
     // final movement Vector
     Vector3 Velocity = (MovHoriz + MovVert).normalized * Movespeed;

     //Apply Movement
     Motor.Mov(Velocity);

     //Calculate rotation as 3D Vector (turning arround)
     float _yrot = Input.GetAxisRaw("Mouse X");

     Vector3 _rotation = new Vector3(0f, _yrot, 0f) * LookSens;
     //Apply rotation 
     Motor.Rotate(_rotation);


     //Calculate camrea rotation as 3D Vector (turning arround)
     float _xrot = Input.GetAxisRaw("Mouse Y");

     float _cameraRotationX = _xrot * LookSens;
     //Vector3 _camrearotation = new Vector3(0f, _xrot, 0f) * LookSens;
     //Apply rotation 
     Motor.RotateCamera(_cameraRotationX);
 }

}

,[RequireComponent(typeof(Rigidbody))] public class Movement : MonoBehaviour { [SerializeField] private Camera Cam;

 Rigidbody rb;
 private Vector3 velocity = Vector3.zero;
 private Vector3 rotation = Vector3.zero;
 //private Vector3 camreaRotation = Vector3.zero;
 private float camreaRotationX = 0f;
 private float currentcamreaRotationX = 0f;

 [SerializeField]
 private float cameraRotationLimit = 85f; 

 private void Start()
 {
     rb = GetComponent<Rigidbody>();
 }
 // Gets a movement vector
 public void Mov(Vector3 _velocity)
 {
     velocity = _velocity;
 }
 //get a rotational vector
 public void Rotate(Vector3 _rotation)
 {
     rotation = _rotation;
 }

 //get a rotational vector for cam
 public void RotateCamera(float _camreaRotationX)
 {
     camreaRotationX = _camreaRotationX;
 }

 //runs all Physics
 private void FixedUpdate()
 {
     PerformMovement();
     PerformRotation();
 }

 void PerformMovement()
 {
     if (velocity != Vector3.zero)
     {
         rb.MovePosition(rb.position + velocity * Time.fixedDeltaTime);
     }

 }

 void PerformRotation()
 {
     rb.MoveRotation(rb.rotation * Quaternion.Euler(rotation));
     if (Cam != null)
     {
         // Set our rotation and clamp it
         currentcamreaRotationX -= camreaRotationX;
         currentcamreaRotationX = Mathf.Clamp(currentcamreaRotationX, -cameraRotationLimit, cameraRotationLimit);

         //Apply our rotation to the transform of our camera
         Cam.transform.localEulerAngles = new Vector3(currentcamreaRotationX, 0f, 0f);

         //Cam.transform.Rotate(-camreaRotation);
     }
 }

}

player controller

[RequireComponent(typeof(Movement))] public class PlayerController : MonoBehaviour { [SerializeField] private float Movespeed = 10.0f; [SerializeField] private float LookSens = 10.0f;

 private Movement Motor;

 private void Start()
 {
     Motor = GetComponent<Movement>();
 }

 private void Update()
 {
     //lock cursor to center of screen press Esc to escape  
     Cursor.lockState = CursorLockMode.Locked;

     //calculate movement Velocity as 3D vector
     float xMov = Input.GetAxisRaw("Horizontal");
     float zmov = Input.GetAxisRaw("Vertical");

     Vector3 MovHoriz = transform.right * xMov;
     Vector3 MovVert = transform.forward * zmov;
     // final movement Vector
     Vector3 Velocity = (MovHoriz + MovVert).normalized * Movespeed;

     //Apply Movement
     Motor.Mov(Velocity);

     //Calculate rotation as 3D Vector (turning arround)
     float _yrot = Input.GetAxisRaw("Mouse X");

     Vector3 _rotation = new Vector3(0f, _yrot, 0f) * LookSens;
     //Apply rotation 
     Motor.Rotate(_rotation);


     //Calculate camrea rotation as 3D Vector (turning arround)
     float _xrot = Input.GetAxisRaw("Mouse Y");

     float _cameraRotationX = _xrot * LookSens;
     //Vector3 _camrearotation = new Vector3(0f, _xrot, 0f) * LookSens;
     //Apply rotation 
     Motor.RotateCamera(_cameraRotationX);
 }

}