C# Mouse Look Script | Why does the Y Axis Work but not the X Axis?

Hello!

I've been teaching myself the basics of Unity lately by creating a first-person game.

Everything works except for my C# mouse look code. The camera rotates up and down on a clamped Y axis (as desired), however, the camera won't rotate left or right on the X-axis.

However, if I remove this code from the mouse look script:

mouseUpDown = Mathf.Clamp(mouseUpDown, -mouseLookLimit, mouseLookLimit); Camera.main.transform.localRotation = Quaternion.Euler(mouseUpDown, 0, 0);

The camera can rotate on the X-axis again.

I've posted my code below along with a screenshot of my inspector panel/character controller; can anyone explain what's gone wrong and how to fix it?

If you need anymore information or screenshots, let me know and I'll post it.

Thanks in advance!

Andy

C# Script:

 using UnityEngine;
 using System.Collections;
 
 public class playerMovement : MonoBehaviour
 {
 
     public float moveSpeed, walkSpeed, runSpeed, crouchSpeed; 
     public float mouseSensitivity, mouseUpDown, mouseLeftRight, mouseLookLimit; 
     public float verticalJump, jumpStrength, jumpGravity;
     CharacterController crouchMove; 
     CharacterController jumpMove;
 
 
     void Start()
     {
         crouchMove = gameObject.GetComponent<CharacterController>(); 
         jumpMove = gameObject.GetComponent<CharacterController>();
     }
 
 
     void Update()
     {
 
 //------------------- Forwards, Backwards, Strafe Side-to-Side Movement -------
 
         float forwardBackMove = Input.GetAxis("Vertical") * moveSpeed; 
         float leftRightMove = Input.GetAxis("Horizontal") * moveSpeed; 
         Vector3 speed = new Vector3(leftRightMove, 0, forwardBackMove); 
         speed = transform.rotation * speed;
 
 //------------------- Sprinting  --------------------------------------------------------------------
 
         if (Input.GetKey(KeyCode.LeftShift)) 
         {
             moveSpeed += 5;
 
             if (moveSpeed >= runSpeed)
             {
                 moveSpeed = runSpeed;
             }
         }
         else
         {
             moveSpeed = walkSpeed;
         }
 
 //------------------- MOUSE LOOK SCRIPT -----------------------------------------------
 
         mouseLeftRight = Input.GetAxis ("Mouse X") * mouseSensitivity; 
         transform.Rotate(0, mouseLeftRight, 0); 
 
         mouseUpDown -= Input.GetAxis ("Mouse Y") * mouseSensitivity; 
         mouseUpDown = Mathf.Clamp(mouseUpDown, -mouseLookLimit, mouseLookLimit); 
         Camera.main.transform.localRotation = Quaternion.Euler(mouseUpDown, 0, 0); 
 
 
 //------------------- CROUCHING AND STANDING -----------------------------------
 
         if (Input.GetKey(KeyCode.LeftControl)) 
         {
             crouchMove.height = 1.0f; 
             moveSpeed = crouchSpeed;
         }
         else 
         {
             crouchMove.height += 0.3f; 
             if (crouchMove.height >= 1.96) { 
                 crouchMove.height = 1.96f;
             }
 
         }
 
 //------------------- JUMPING AND GRAVITY------------------------------------------------
 
         if (jumpMove.isGrounded) {
             verticalJump = -jumpGravity * Time.deltaTime;
             if (Input.GetKey(KeyCode.Space)){
                 verticalJump = jumpStrength;
             }
         }
         else
         {
             verticalJump -= jumpGravity * Time.deltaTime;
         }
         Vector3 jumpVector = new Vector3(0, verticalJump, 0);
         jumpMove.Move(jumpVector * Time.deltaTime);
 
 
 //------------------- CHARACTER CONTROLLER ----------------------------------------
 
         CharacterController  playerController = GetComponent<CharacterController>(); 
         playerController.SimpleMove(speed); 
         
     }
 }