resp.data; 에러

import 'dart:convert';
import 'dart:async';
import 'package:colorfactor/common/const/data.dart';
import 'package:colorfactor/common/layout/default_layout.dart';
import 'package:colorfactor/product/component/product_card.dart';
import 'package:colorfactor/restaurant//component/CourtCard.dart';
import 'package:colorfactor/restaurant/model/restaurant_detail_model.dart';
import 'package:dio/dio.dart';
import 'package:flutter/material.dart';

class RestaurantDetailScreen extends StatelessWidget {
  final String id;


  const RestaurantDetailScreen({super.key, required this.id});

  Future<Map<String, dynamic>> getRestaurantDetail() async {
    final dio = Dio();

    final accessToken = await storage.read(key: ACCESS_TOKEN_KEY);

    final resp = dio.get('http://$ip/restaurant/$id',
      options: Options(
      headers: {
        'authorization' : 'Bearer $accessToken'
      },
    ),
    );
    return resp.data;
    
  }

  @override
  Widget build(BuildContext context) {
    return DefaultLayout(
        title: '불타는 덕볶이',
        child:  FutureBuilder<Map<String, dynamic>>(
          future: getRestaurantDetail(),
            builder: (_, AsyncSnapshot<Map<String, dynamic>> snapshot){
            print(snapshot.data);
            if(!snapshot.hasData){
              return Container();
            }
            
            final item = RestaurantDetailModel.fromJson(
              json: snapshot.data!,
            );
              return CustomScrollView(
                slivers: [
                  renderTop(),
                  renderLabel(),
                  renderProducts(),
                ],
              );
            }
        ),
    );
  }

 SliverPadding renderLabel(){
    return SliverPadding(
      padding: EdgeInsets.symmetric(horizontal: 16),
      sliver: SliverToBoxAdapter(
        child: Text('메뉴', style: TextStyle(fontSize: 18, fontWeight: FontWeight.w500),),
      ),
    );
 }
  
  
  renderProducts(){
    return SliverPadding(
      padding: EdgeInsets.symmetric(horizontal: 16),
      sliver: SliverList(
          delegate: SliverChildBuilderDelegate((context, index){
            return Padding(
              padding: const EdgeInsets.only(top: 16.0),
              child: ProductCard(),
            );
      },
        childCount: 10,
          ),
      ),
    );

  }



  SliverToBoxAdapter renderTop(){
   return SliverToBoxAdapter(
      child: RestaurantCard(
        image: Image.asset('asset/img/2.jpg'),
        name: '불떡',
        tags: ['떡복이','맛다','치즈'],
        ratings: 4.5,
        ratingsCount: 100,
        distanceRange: 10,
        courtFee: 4000,
        isDetail: true,
        detail: '맛있는 떡복이',
      ),
    );
  }

}

return resp.data; 부분에서 아래와 같이
Error: The getter 'data' isn't defined for the class 'Future<Response<dynamic>>'.
계속 에러를 반환하는데 도무지 이유를 모르겠습니다.

Future<Map<String, dynamic>> getRestaurantDetail() async {
  final dio = Dio();

  final accessToken = await storage.read(key: ACCESS_TOKEN_KEY);

  // `await`를 추가하여 `dio.get`이 완료될 때까지 기다립니다.
  final resp = await dio.get('http://$ip/restaurant/$id',
    options: Options(
      headers: {
        'authorization' : 'Bearer $accessToken'
      },
    ),
  );
  
  // `resp.data`를 리턴
  return resp.data;
}