Rotate Camera using Accelerometer

Hi , i want rotate Camera using Acceleration in Landspace orientation . Following Code work in dir.y fine but in dir.x only work when Phone is flat . When Phone is in Landspace-Vertical Camera just rotate up and for rotate down i must flat Phone (input.y=0 to -) then rotate down . Actully must sense tlit forward and backward in Vertial-Landspace-Orientation (not flat) . any Idea? , Thanks .

         accerangex=Mathf.Abs(-Input.acceleration.y);
         accerangey=Mathf.Abs(Input.acceleration.x);
 
         Vector3 dir = Vector2.zero;
 
         dir.x = -Input.acceleration.y ;
         dir.y = Input.acceleration.x ;
 
         if (dir.sqrMagnitude >1)
         dir.Normalize();
         dir *= Time.deltaTime;
         if (accerangex < 0.82){
             transform.Rotate(dir.x * 2, 0 , 0);
         }
         if (accerangey > 0.1){
             transform.Rotate(0 , dir.y * 20 , 0);
         }