Make third person character rotate such that it is orthogonal to the floor normal

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I want to make a third person character rotate so that its transform.up is the same as the normal vector of the floor it is standing on, and I am pretty much completely lost. here is my script, any help would be great.

using System;
using Unity.VisualScripting;
using UnityEditor.Callbacks;
using UnityEngine;
using UnityEngine.Animations;

public class player : MonoBehaviour
{
    public float speed;
    public float MaxFloorAngle;
    Vector3 floorAngle;

    Rigidbody rb;
    public Transform Cam;
    bool grounded;

    Vector3 moveDir;
    public float JumpHeight;
    float mouseX, mouseY; 

    // Start is called before the first frame update
    void Start()
    {
        rb = GetComponent<Rigidbody>();
        rb.freezeRotation = true;
        Cursor.lockState = CursorLockMode.Locked;
    }

    float xRotation;
    float desiredX;


    // Update is called once per frame
    void Update()
    {
        GetInput();
        Look();
    }

    private void Look()
    {
        //transform.localRotation = Quaternion.Euler(0, Cam.eulerAngles.y, 0);
    }

    void FixedUpdate()
    {
        if(grounded)
        {
            rb.AddForce(moveDir * speed, ForceMode.Force);
            rb.drag = 6;
        }else
        {
            rb.AddForce(moveDir * speed / 3, ForceMode.Force);
            rb.drag = 2;
        }

        if(grounded && Input.GetButton("Jump"))
        {
            rb.velocity = new Vector3(rb.velocity.x, 0, rb.velocity.z);
            rb.AddForce(Vector3.up * JumpHeight, ForceMode.Impulse);
        }
        transform.localRotation = Quaternion.Euler((floorAngle * Mathf.Rad2Deg).x, (floorAngle * Mathf.Rad2Deg).y * Cam.eulerAngles.y, (floorAngle * Mathf.Rad2Deg).z);
    }

    private void GetInput()
    {
        moveDir = (transform.forward * Input.GetAxis("Vertical")  * speed + transform.right * Input.GetAxis("Horizontal") * speed); 
        grounded = Physics.Raycast(transform.position, Vector3.down, 0.1f);
        mouseX = Input.GetAxis("Mouse X") * Time.deltaTime * 400;
        mouseY = Input.GetAxis("Mouse Y") * Time.deltaTime * 400;
        RaycastHit hit = new RaycastHit();
        Ray ray = new Ray(transform.position, Vector3.down);
        if(Physics.Raycast(ray, out hit))
        {
            floorAngle = hit.normal;
            Debug.Log(floorAngle * Mathf.Rad2Deg);
        }
    }
}

thanks!