Flying space game rotate X axis problem

i just starting out with building hte basis of a space game with mouse controls and keyboard, i have my W as throttle and mouse for rotation, my problem is though that now i can only turn UP (moving my mouse down as intended) but i cannot get it to go abive 0 in my "yew" igt goes to minus perfectly fine, but i cannot get my space craft to "dive" :/ my code is as follow:

     public float yew = 0f;
     public float yewMax = 0f;    
 
 //yewing
         if(engineOn == true){
             yew += Input.GetAxis("Mouse Y") * 50f * Time.deltaTime;
         }
 
         yew = Mathf.Max(Mathf.Min(yew,yewMax),(-45f));
         transform.Rotate(yew*Time.deltaTime,0,0);
         
         if(yew > 0 && Input.GetAxis("Mouse Y") == 0f){
             yew-=Time.deltaTime * 10f;
             yew = Mathf.Max(yew,0);
         }

Any help would be apreaciated ^^ im still VERY new to unity and coding in general so be gentle hehe! Best regards Martin