what has gone wrong in my html and js source code

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Gym Management System</title>
    
    <link rel="stylesheet" href="styles.css">
</head>
<body>
    <div id="app"
    </div>
    <script type="module" src="scripts.js" defer ></script>
</html>



SCRIPT.JS FILE

import { initializeApp } from 'https://www.gstatic.com/firebasejs/9.1.0/firebase-app.js';
import { getAuth, signInWithEmailAndPassword, createUserWithEmailAndPassword, signOut } from 'https://www.gstatic.com/firebasejs/9.1.0/firebase-auth.js';
import { getFirestore, collection, addDoc, getDocs, serverTimestamp, query, orderBy } from 'https://www.gstatic.com/firebasejs/9.1.0/firebase-firestore.js';


const firebaseConfig = {
    apiKey: "AIzaSyAqW1Sb6okV-bIp6Z_q1LjnR62fjEyEOKM",
    authDomain: "management-system-f0b2b.firebaseapp.com",
    projectId:"management-system-f0b2b",
    storageBucket: "management-system-f0b2b.appspot.com",
    messagingSenderId:"412778751231",
    appId: "1:412778751231:web:316fe137b5c980417ed8ca",
    measurementId:"G-KBG05HJ8F6"
};

// Initialize Firebase
firebase.initializeApp(firebaseConfig);
const auth = firebase.auth();
const db = firebase.firestore();
const analytics = getAnalytics(app);

document.addEventListener('DOMContentLoaded', () => {
    const app = document.getElementById('app');

    const renderLogin = () => {
        app.innerHTML = `
            <h2>Login</h2>
            <form id="login-form">
                <input type="email" id="login-email" placeholder="Email" required>
                <input type="password" id="login-password" placeholder="Password" required>
                <button type="submit">Login</button>
            </form>
            <p>Don't have an account? <a href="#" id="signup-link">Sign up</a></p>
        `;

        document.getElementById('login-form').addEventListener('submit', (e) => {
            e.preventDefault();
            const email = document.getElementById('login-email').value;
            const password = document.getElementById('login-password').value;

            auth.signInWithEmailAndPassword(email, password)
                .then((userCredential) => {
                    console.log('User logged in:', userCredential.user);
                    renderDashboard();
                })
                .catch((error) => {
                    console.error('Error logging in:', error);
                });
        });

        document.getElementById('signup-link').addEventListener('click', (e) => {
            e.preventDefault();
            renderSignup();
        });
    };

    const renderSignup = () => {
        app.innerHTML = `
            <h2>Sign Up</h2>
            <form id="signup-form">
                <input type="email" id="signup-email" placeholder="Email" required>
                <input type="password" id="signup-password" placeholder="Password" required>
                <button type="submit">Sign Up</button>
            </form>
            <p>Already have an account? <a href="#" id="login-link">Login</a></p>
        `;

        document.getElementById('signup-form').addEventListener('submit', (e) => {
            e.preventDefault();
            const email = document.getElementById('signup-email').value;
            const password = document.getElementById('signup-password').value;

            auth.createUserWithEmailAndPassword(email, password)
                .then((userCredential) => {
                    console.log('User signed up:', userCredential.user);
                    renderDashboard();
                })
                .catch((error) => {
                    console.error('Error signing up:', error);
                });
        });

        document.getElementById('login-link').addEventListener('click', (e) => {
            e.preventDefault();
            renderLogin();
        });
    };

    const renderDashboard = () => {
        app.innerHTML = `
            <h2>Dashboard</h2>
            <button id="logout">Logout</button>
            <h3>Members</h3>
            <div id="members-list"></div>
            <h3>Add Member</h3>
            <form id="add-member-form">
                <input type="text" id="member-name" placeholder="Name" required>
                <input type="email" id="member-email" placeholder="Email" required>
                <button type="submit">Add Member</button>
            </form>
            </div>
            <div class="section">
                <h3>Fees</h3>
                <div id="fees-list"></div>
                <form id="add-fee-form">
                    <input type="text" id="fee-member-email" placeholder="Member Email" required>
                    <input type="number" id="fee-amount" placeholder="Amount" required>
                    <button type="submit">Add Fee</button>
                </form>
            </div>
            <div class="section">
                <h3>Working Day Notifications</h3>
                <div id="notifications-list"></div>
                <form id="add-notification-form">
                    <input type="text" id="notification-message" placeholder="Notification Message" required>
                    <button type="submit">Add Notification</button>
                </form>
            </div>
        `;

        document.getElementById('logout').addEventListener('click', () => {
            auth.signOut().then(() => {
                console.log('User logged out');
                renderLogin();
            });
        });

        const addMemberForm = document.getElementById('add-member-form');
        addMemberForm.addEventListener('submit', (e) => {
            e.preventDefault();
            const name = document.getElementById('member-name').value;
            const email = document.getElementById('member-email').value;

            db.collection('members').add({
                name: name,
                email: email,
                createdAt: firebase.firestore.FieldValue.serverTimestamp()
            })
            .then(() => {
                console.log('Member added');
                addMemberForm.reset();
                loadMembers();
            })
            .catch((error) => {
                console.error('Error adding member:', error);
            });
        });
        const addFeeForm = document.getElementById('add-fee-form');
        addFeeForm.addEventListener('submit', (e) => {
            e.preventDefault();
            const email = document.getElementById('fee-member-email').value;
            const amount = document.getElementById('fee-amount').value;

            db.collection('fees').add({
                email: email,
                amount: amount,
                createdAt: firebase.firestore.FieldValue.serverTimestamp()
            })
            .then(() => {
                console.log('Fee added');
                addFeeForm.reset();
                loadFees();
            })
            .catch((error) => {
                console.error('Error adding fee:', error);
            });
        });

        const addNotificationForm = document.getElementById('add-notification-form');
        addNotificationForm.addEventListener('submit', (e) => {
            e.preventDefault();
            const message = document.getElementById('notification-message').value;

            db.collection('notifications').add({
                message: message,
                createdAt: firebase.firestore.FieldValue.serverTimestamp()
            })
            .then(() => {
                console.log('Notification added');
                addNotificationForm.reset();
                loadNotifications();
            })
            .catch((error) => {
                console.error('Error adding notification:', error);
            });
        });


        loadMembers();
        loadFees();
        loadNotifications();
    };

    const loadMembers = () => {
        const membersList = document.getElementById('members-list');
        membersList.innerHTML = '';

        db.collection('members').orderBy('createdAt', 'desc').get()
            .then((querySnapshot) => {
                querySnapshot.forEach((doc) => {
                    const member = doc.data();
                    membersList.innerHTML += `
                        <div>
                            <h4>${member.name}</h4>
                            <p>${member.email}</p>
                        </div>
                    `;
                });
            })
            .catch((error) => {
                console.error('Error loading members:', error);
            });
    };

    const loadFees = () => {
        const feesList = document.getElementById('fees-list');
        feesList.innerHTML = '';

        db.collection('fees').orderBy('createdAt', 'desc').get()
            .then((querySnapshot) => {
                querySnapshot.forEach((doc) => {
                    const fee = doc.data();
                    feesList.innerHTML += `
                        <div>
                            <h4>${fee.email}</h4>
                            <p>Amount: $${fee.amount}</p>
                        </div>
                    `;
                });
            })
            .catch((error) => {
                console.error('Error loading fees:', error);
            });
    };

    const loadNotifications = () => {
        const notificationsList = document.getElementById('notifications-list');
        notificationsList.innerHTML = '';

        db.collection('notifications').orderBy('createdAt', 'desc').get()
            .then((querySnapshot) => {
                querySnapshot.forEach((doc) => {
                    const notification = doc.data();
                    notificationsList.innerHTML += `
                        <div class="notification">
                            <p>${notification.message}</p>
                        </div>
                    `;
                });
            })
            .catch((error) => {
                console.error('Error loading notifications:', error);
            });
    };

    // Initial render
    auth.onAuthStateChanged((user) => {
        if (user) {
            renderDashboard();
        } else {
            renderLogin();
        }
    });
});


i am not able to get the output.
my html file is not able to process the link to my javascript file
why can i not import rules form firebase
now my console is only showing problem with my html code
i am new to programming so i’m just trying to incorporate codes from here and there but nothing is working out.