slowpoker/Assets/Scripts/Player/CameraController.cs

using UnityEngine;

namespace Player
{
    public class CameraController : MonoBehaviour
    {
        public Transform targetCameraPosition;
        public float mouseSensitivity = 100f;

        private Camera _camera;
        private Transform _cameraTransform;
        private float _xRotation = 0f;

        void Start()
        {
            _camera = Camera.main;
            if (_camera != null) _cameraTransform = _camera.transform;
            Cursor.lockState = CursorLockMode.Locked;
        }

        void Update()
        {
            float mouseX = Input.GetAxis("Mouse X") * mouseSensitivity * Time.deltaTime;
            float mouseY = Input.GetAxis("Mouse Y") * mouseSensitivity * Time.deltaTime;

            _xRotation -= mouseY;
            _xRotation = Mathf.Clamp(_xRotation, -90f, 90f);

            if (Cursor.lockState == CursorLockMode.Locked)
            {
                transform.Rotate(Vector3.up * mouseX);
                _cameraTransform.localRotation = Quaternion.Euler(_xRotation, 0f, 0f);
                _cameraTransform.rotation = Quaternion.Euler(_xRotation, transform.eulerAngles.y, 0f);
                _cameraTransform.position = targetCameraPosition.position;
            }
        }
    }
}