Character to Ground and Turn Rotation

Hey Unity Com!

What I want to do ? I want a simple 3rd Person Camera/Character Setup, but the Character rotates (beside Turn Rotation) depending on the Ground so he always "up" when he is f.e. walking Stairs

 var rcHit : RaycastHit;
 //Make raycast direction down
 var theRay : Vector3 = transform.TransformDirection(Vector3.down);
      
  if (Physics.Raycast(transform.position, theRay, rcHit)) {
  //this is for getting distance from object to the ground
  var GroundDis = rcHit.distance;
  //with this you rotate object to adjust with terrain
  transform.rotation = Quaternion.FromToRotation(Vector3.up,  rcHit.normal) * transform.rotation;
 }  

• Rotates Character based on Ground Angle to Character.

This works, also when I rotate using the Camera (version of Character Rotation I use)

  if(Input.GetMouseButton(1)) {
     transform.rotation = Quaternion.Euler(0,Camera.main.transform.eulerAngles.y,0);
 }

But what he is not doing is the normal Turn Rotation based on a Input

  transform.Rotate (0, Input.GetAxis("Horizontal") * rotateSpeed * Time.deltaTime, 0);

This ends in a mess, propaply because of the Y Axis is now not the Up Vector based on my Character. Looked in the Forum but didnt found much. Would be awesome if someone can point me in the direction of a valid way :)