My request is "
Make this web app more fast and smooth as possible in all circumstances.

Utilise all of the things used in the code to their maximum potential. 

Leverage the whole code qualit. 

Add a visually appealing menu button and menu.

The menu should only block half off the screen when opeed.

The menu option should only consist of 'menu, ln PDFs, ln epubs, release dates, webnovels, manga.'

When user click on menu button it's should redirect the user to the first page where all of the novels are being displayed.

Make all of the animations as smooth as possible in all circumstances.

Use only the best and suitable methods only.

Block all of the user interaction within the visible areas like models, scrolling, etc when ever menu or settings panel is opened.

Always close the menu when user click on the area which is not occupied by the opened menu.

Slide up the settings panel when user click on the settings option in menu.

Make sure that the header title 'light novel library collection' or menu button won't block or overshadow or interfare or conflict any other ui elements. 

Improve the UI And UX.

Make it even better and robust.

Refine it further.

Don't compromise.

Position all of the elements so they won't conflict with eachother.

Always consider the bigger and broader ceinerios and always consider all of the potential consequences of your actions.

Send the fully working full code.

 "

My code: <!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Light Novel Library</title>

  <!-- Preconnect for performance -->
  <link rel="preconnect" href="https://fonts.googleapis.com" crossorigin>
  <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
  
  <!-- Load Fonts with swap to ensure text visibility -->
  <link href="https://fonts.googleapis.com/css2?family=Inter:wght@400;600;700&display=swap" rel="stylesheet">

  <!-- External Libraries -->
  <script src="https://code.jquery.com/jquery-3.6.4.min.js" crossorigin="anonymous"></script>
  <script src="https://cdn.jsdelivr.net/npm/dexie@3.2.5/dist/dexie.min.js" ></script>
  <script src="https://cdn.jsdelivr.net/npm/aos@2.3.4/dist/aos.js" ></script>
  
  <!-- AOS CSS -->
  <link href="https://cdn.jsdelivr.net/npm/aos@2.3.4/dist/aos.css" rel="stylesheet">

  <!-- Stylesheet -->
  <style>
    /* Root Variables */
    :root {
      --primary-color: #ffffff;
      --secondary-color: #000000;
      --background-color: #121212;
      --card-background: #1e1e1e;
      --text-primary: #ffffff;
      --text-secondary: #bbbbbb;
      --border-color: #333333;
      --shadow-sm: 0 1px 3px rgba(255,255,255,0.1);
      --shadow-md: 0 4px 6px rgba(255,255,255,0.1);
      --shadow-lg: 0 10px 15px rgba(255,255,255,0.1);
      --radius-sm: 0.375rem;
      --radius-md: 0.5rem;
      --radius-lg: 1rem;
      --transition-duration: 0.3s;
      --max-width: 1280px;
      --header-height: 80px;
      --toast-background: rgba(0, 0, 0, 0.8);
      --toast-color: #ffffff;
      --font-family: 'Inter', sans-serif;
    }

    /* Light Theme Variables */
    [data-theme="light"] {
      --primary-color: #000000;
      --secondary-color: #ffffff;
      --background-color: #f0f4f8;
      --card-background: #ffffff;
      --text-primary: #1f2937;
      --text-secondary: #6b7280;
      --border-color: #dddddd;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.12);
      --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
      --shadow-lg: 0 10px 15px rgba(0,0,0,0.1);
      --toast-background: rgba(255, 255, 255, 0.9);
      --toast-color: #000000;
    }

    /* Reset and Base Styles */
    *, ::before, ::after {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    body {
      font-family: var(--font-family);
      background-color: var(--background-color);
      color: var(--text-primary);
      line-height: 1.6;
      min-height: 100vh;
      display: flex;
      flex-direction: column;
      transition: background-color var(--transition-duration) ease, color var(--transition-duration) ease;
    }

    /* Header Styles */
    .header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 1rem 2rem;
      background-color: var(--card-background);
      box-shadow: var(--shadow-sm);
      border-radius: var(--radius-md);
      position: sticky;
      top: 0;
      z-index: 1000;
      transition: background-color var(--transition-duration) ease;
    }

    .header__title {
      font-size: 1.75rem;
      font-weight: 700;
      color: var(--text-primary);
    }

    /* Toggle Switch Styles */
    .toggle-switch {
      position: relative;
      display: inline-block;
      width: 60px;
      height: 34px;
    }

    .toggle-switch input {
      opacity: 0;
      width: 0;
      height: 0;
    }

    .slider {
      position: absolute;
      cursor: pointer;
      top: 0;
      left: 0;
      right: 0;
      bottom: 0;
      background-color: var(--border-color);
      transition: background-color var(--transition-duration) ease;
      border-radius: 34px;
    }

    .slider::before {
      position: absolute;
      content: "";
      height: 26px;
      width: 26px;
      left: 4px;
      bottom: 4px;
      background-color: var(--secondary-color);
      transition: transform var(--transition-duration) ease, background-color var(--transition-duration) ease;
      border-radius: 50%;
    }

    input:checked + .slider {
      background-color: var(--primary-color);
    }

    input:checked + .slider::before {
      transform: translateX(26px);
      background-color: var(--secondary-color);
    }

    /* Main Content Styles */
    .main {
      flex: 1;
      max-width: var(--max-width);
      margin: 2rem auto;
      padding: 0 1.5rem;
      width: 100%;
    }

    /* Search and Refresh Styles */
    .search-container {
      display: flex;
      flex-wrap: wrap;
      gap: 1rem;
      align-items: center;
      margin-bottom: 2rem;
    }

    .search-input {
      flex: 1;
      min-width: 250px;
      padding: 0.75rem 1.5rem;
      font-size: 1rem;
      border: 2px solid var(--border-color);
      border-radius: var(--radius-md);
      outline: none;
      transition: border-color var(--transition-duration) ease, background-color var(--transition-duration) ease, color var(--transition-duration) ease;
      background-color: var(--card-background);
      color: var(--text-primary);
    }

    .search-input::placeholder {
      color: var(--text-secondary);
    }

    .search-input:focus {
      border-color: var(--primary-color);
    }

    .refresh-button {
      display: flex;
      align-items: center;
      gap: 0.5rem;
      padding: 0.75rem 1.5rem;
      font-size: 1rem;
      border: 2px solid var(--border-color);
      border-radius: var(--radius-md);
      background-color: var(--secondary-color);
      color: var(--primary-color);
      cursor: pointer;
      transition: background-color var(--transition-duration) ease, color var(--transition-duration) ease, border-color var(--transition-duration) ease, transform 0.2s ease;
      min-width: 150px;
    }

    .refresh-button:hover {
      background-color: var(--primary-color);
      color: var(--secondary-color);
      border-color: var(--primary-color);
      transform: translateY(-2px);
    }

    .refresh-button:active {
      transform: translateY(0);
    }

    .refresh-button svg {
      width: 20px;
      height: 20px;
      fill: currentColor;
      transition: transform 0.3s ease;
    }

    .refresh-button:hover svg {
      transform: rotate(360deg);
    }

    .refresh-button:disabled {
      opacity: 0.6;
      cursor: not-allowed;
      transform: none;
    }

    /* Grid Styles */
    .grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
      gap: 2rem;
    }

    /* Card Styles */
    .card {
      background: var(--card-background);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: transform var(--transition-duration) ease, box-shadow var(--transition-duration) ease, border-color var(--transition-duration) ease;
      cursor: pointer;
      display: flex;
      flex-direction: column;
      height: 100%;
      opacity: 0;
      transform: translateY(20px);
      animation: fadeInCard 0.5s forwards;
    }

    .card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-lg);
      border-color: var(--primary-color);
    }

    @keyframes fadeInCard {
      to { opacity: 1; transform: translateY(0); }
    }

    .card__image-container {
      position: relative;
      width: 100%;
      padding-top: 140%;
      background: #2a2a2a;
      overflow: hidden;
    }

    .card__image {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.3s ease;
    }

    .card:hover .card__image {
      transform: scale(1.05);
    }

    .card__content {
      padding: 1rem;
      flex-grow: 1;
      display: flex;
      flex-direction: column;
      justify-content: center;
    }

    .card__title {
      font-size: 1.1rem;
      font-weight: 600;
      color: var(--text-primary);
      text-align: center;
      overflow: hidden;
      text-overflow: ellipsis;
      display: -webkit-box;
      -webkit-line-clamp: 3;
      -webkit-box-orient: vertical;
      transition: color var(--transition-duration) ease;
    }

    .card:hover .card__title {
      color: var(--secondary-color);
    }

    /* Loader Styles */
    .loader {
      display: none;
      justify-content: center;
      align-items: center;
      height: 200px;
      color: var(--text-secondary);
    }

    .loader.visible {
      display: flex;
    }

    .loader__spinner {
      width: 50px;
      height: 50px;
      border: 5px solid #444444;
      border-top: 5px solid var(--primary-color);
      border-radius: 50%;
      animation: spin 1s linear infinite;
    }

    /* Spinner Animation */
    @keyframes spin {
      0% { transform: rotate(0deg); }
      100% { transform: rotate(360deg); }
    }

    /* Error Message Styles */
    .error-message {
      text-align: center;
      color: #ff8080;
      padding: 1rem;
      background: var(--border-color);
      border-radius: var(--radius-sm);
      margin: 1rem 0;
      opacity: 1;
      transition: opacity 0.5s ease-out;
    }

    .error-message.fade-out {
      opacity: 0;
    }

    /* Modal Styles */
    .modal {
      display: none;
      position: fixed;
      z-index: 2000;
      left: 0;
      top: 0;
      width: 100%;
      height: 100%;
      overflow: auto;
      background-color: rgba(0,0,0,0.85);
      justify-content: center;
      align-items: center;
      padding: 1rem;
      transition: opacity 0.3s ease;
    }

    .modal.show {
      display: flex;
      opacity: 1;
    }

    .modal-content {
      background-color: var(--card-background);
      padding: 2rem;
      border-radius: var(--radius-lg);
      max-width: 700px;
      width: 100%;
      position: relative;
      box-shadow: var(--shadow-lg);
      animation: fadeInModal 0.3s ease;
      color: var(--text-primary);
    }

    @keyframes fadeInModal {
      from { opacity: 0; transform: translateY(-20px); }
      to { opacity: 1; transform: translateY(0); }
    }

    .close {
      position: absolute;
      top: 1rem;
      right: 1.5rem;
      color: var(--text-secondary);
      font-size: 2rem;
      font-weight: bold;
      cursor: pointer;
      transition: color var(--transition-duration) ease;
      background: none;
      border: none;
      font-family: inherit;
    }

    .close:hover,
    .close:focus {
      color: var(--primary-color);
      outline: none;
    }

    .modal__title {
      font-size: 1.75rem;
      font-weight: 700;
      margin-bottom: 1rem;
      color: var(--text-primary);
      text-align: center;
    }

    .modal__link {
      display: inline-block;
      padding: 0.75rem 1.5rem;
      background-color: var(--primary-color);
      color: var(--secondary-color);
      text-decoration: none;
      border-radius: var(--radius-md);
      font-weight: 600;
      transition: background-color var(--transition-duration) ease, color var(--transition-duration) ease;
      text-align: center;
      width: 100%;
    }

    .modal__link:hover {
      background-color: var(--secondary-color);
      color: var(--primary-color);
    }

    /* Sentinel Element for Infinite Scroll */
    .sentinel {
      height: 1px;
    }

    /* Progress Bar Styles */
    .progress-container {
      width: 100%;
      background-color: #333333;
      border-radius: var(--radius-md);
      margin: 1rem 0;
      display: none;
    }

    .progress-bar {
      height: 10px;
      width: 0%;
      background-color: var(--primary-color);
      border-radius: var(--radius-md);
      transition: width 0.3s ease;
    }

    .progress-text {
      text-align: center;
      margin-top: 0.5rem;
      font-size: 0.9rem;
      color: var(--text-primary);
      display: none;
    }

    /* Toast Styles */
    .toast-container {
      position: fixed;
      bottom: 20px;
      right: 20px;
      z-index: 3000;
      display: flex;
      flex-direction: column;
      gap: 0.5rem;
    }

    .toast {
      background-color: var(--toast-background);
      color: var(--toast-color);
      padding: 1rem 1.5rem;
      border-radius: var(--radius-sm);
      box-shadow: var(--shadow-lg);
      display: flex;
      align-items: center;
      gap: 0.5rem;
      animation: slideIn 0.5s forwards;
      opacity: 0;
      transition: opacity 0.3s ease;
    }

    .toast.show {
      opacity: 1;
    }

    @keyframes slideIn {
      from {
        transform: translateX(100%);
        opacity: 0;
      }
      to {
        transform: translateX(0);
        opacity: 1;
      }
    }

    .toast.success {
      background-color: #28a745;
      color: #ffffff;
    }

    .toast.error {
      background-color: #dc3545;
      color: #ffffff;
    }

    .toast svg {
      width: 20px;
      height: 20px;
      fill: currentColor;
    }

    /* Responsive Styles */
    @media (max-width: 1024px) {
      .header__title {
        font-size: 1.5rem;
      }
    }

    @media (max-width: 768px) {
      .grid {
        grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
        gap: 1.5rem;
      }

      .card__title {
        font-size: 1rem;
      }

      .refresh-button {
        width: 100%;
        justify-content: center;
      }
    }

    @media (max-width: 480px) {
      .grid {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
        gap: 1rem;
      }

      .header {
        flex-direction: column;
        align-items: flex-start;
      }

      .toggle-switch {
        margin-top: 1rem;
      }
    }

    /* Menu Button and Menu Styles */
    .menu-button {
      position: fixed;
      top: 1rem;
      left: 1rem;
      z-index: 1001;
      background-color: var(--card-background);
      color: var(--text-primary);
      border: none;
      padding: 0.75rem;
      border-radius: var(--radius-sm);
      cursor: pointer;
      transition: background-color var(--transition-duration) ease, color var(--transition-duration) ease;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .menu-button:hover {
      background-color: var(--primary-color);
      color: var(--secondary-color);
    }

    .menu-button svg {
      width: 24px;
      height: 24px;
      fill: currentColor;
    }

    .menu {
      position: fixed;
      top: 0;
      left: 0;
      width: 50%;
      height: 100%;
      background-color: var(--card-background);
      box-shadow: var(--shadow-lg);
      transform: translateX(-100%);
      transition: transform var(--transition-duration) ease;
      z-index: 1000;
      display: flex;
      flex-direction: column;
      padding: 2rem;
    }

    .menu.open {
      transform: translateX(0);
    }

    .menu__item {
      padding: 1rem 0;
      color: var(--text-primary);
      text-decoration: none;
      font-size: 1.2rem;
      transition: color var(--transition-duration) ease;
    }

    .menu__item:hover {
      color: var(--primary-color);
    }

    /* Settings Panel Styles */
    .settings-panel {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-color: rgba(0, 0, 0, 0.85);
      justify-content: center;
      align-items: center;
      z-index: 1001;
      opacity: 0;
      transition: opacity 0.3s ease;
    }

    .settings-panel.open {
      display: flex;
      opacity: 1;
    }

    .settings-panel__content {
      background-color: var(--card-background);
      padding: 2rem;
      border-radius: var(--radius-lg);
      max-width: 500px;
      width: 100%;
      position: relative;
      box-shadow: var(--shadow-lg);
      animation: fadeInModal 0.3s ease;
      color: var(--text-primary);
    }

    .settings-panel__close {
      position: absolute;
      top: 1rem;
      right: 1.5rem;
      color: var(--text-secondary);
      font-size: 2rem;
      font-weight: bold;
      cursor: pointer;
      transition: color var(--transition-duration) ease;
      background: none;
      border: none;
      font-family: inherit;
    }

    .settings-panel__close:hover,
    .settings-panel__close:focus {
      color: var(--primary-color);
      outline: none;
    }

    .settings-panel__title {
      font-size: 1.75rem;
      font-weight: 700;
      margin-bottom: 1rem;
      color: var(--text-primary);
      text-align: center;
    }

    .settings-panel__toggle {
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 1rem;
    }

    .settings-panel__toggle label {
      font-size: 1.2rem;
      color: var(--text-primary);
    }

    .settings-panel__refresh {
      display: flex;
      justify-content: center;
      margin-top: 1rem;
    }
  </style>
</head>
<body>
  <!-- Header with Title -->
  <header class="header">
    <div class="header__title">Light Novel Library Collection</div>
  </header>

  <!-- Menu Button -->
  <button class="menu-button" id="menu-button" aria-label="Open Menu">
    <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24">
      <path d="M3 18h18v-2H3v2zm0-5h18v-2H3v2zm0-7v2h18V6H3z"/>
    </svg>
  </button>

  <!-- Menu -->
  <nav class="menu" id="menu">
    <a href="#" class="menu__item" data-target="home">Home</a>
    <a href="#" class="menu__item" data-target="ln-pdfs">LN PDFs</a>
    <a href="#" class="menu__item" data-target="ln-epubs">LN EPUBs</a>
    <a href="#" class="menu__item" data-target="release-dates">Release Dates</a>
    <a href="#" class="menu__item" data-target="webnovels">Web Novels</a>
    <a href="#" class="menu__item" data-target="manga">Manga</a>
    <a href="#" class="menu__item" data-target="settings">Settings</a>
  </nav>

  <!-- Settings Panel -->
  <div class="settings-panel" id="settings-panel">
    <div class="settings-panel__content">
      <button class="settings-panel__close" aria-label="Close Settings">&times;</button>
      <h2 class="settings-panel__title">Settings</h2>
      <div class="settings-panel__toggle">
        <label for="theme-toggle">Dark Mode</label>
        <label class="toggle-switch">
          <input type="checkbox" id="theme-toggle" aria-label="Toggle Dark Mode">
          <span class="slider"></span>
        </label>
      </div>
      <div class="settings-panel__refresh">
        <button id="refresh-button" class="refresh-button" aria-label="Refresh Data">
          <!-- Refresh Icon SVG -->
          <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24">
            <path d="M17.65 6.35a7.95 7.95 0 00-11.3 0l-1.41-1.42a10 10 0 0114.14 0c.39.39.39 1.02 0 1.41l-1.42 1.42zM6.35 17.65a7.95 7.95 0 0011.3 0l1.41 1.42a10 10 0 01-14.14 0c-.39-.39-.39-1.02 0-1.41l1.42-1.42z"/>
          </svg>
          Refresh Data
        </button>
      </div>
    </div>
  </div>

  <!-- Main Content -->
  <main class="main" role="main">
    <!-- Search Bar -->
    <div class="search-container">
      <input type="text" id="search-input" class="search-input" placeholder="Search light novels..." aria-label="Search light novels">
    </div>

    <!-- Progress Bar -->
    <div class="progress-container" id="progress-container">
      <div class="progress-bar" id="progress-bar"></div>
    </div>
    <div class="progress-text" id="progress-text">0%</div>

    <!-- Content Grid -->
    <div id="content" class="grid" aria-live="polite">
      <!-- Initial Loader -->
      <div class="loader" id="loader" role="status" aria-label="Loading novels">
        <div class="loader__spinner"></div>
      </div>
    </div>

    <!-- Sentinel Element for Infinite Scroll -->
    <div class="sentinel" id="sentinel"></div>
  </main>

  <!-- Modal -->
  <div id="modal" class="modal" aria-hidden="true" role="dialog" aria-labelledby="modal-title">
    <div class="modal-content">
      <button class="close" aria-label="Close modal">&times;</button>
      <h2 id="modal-title" class="modal__title"></h2>
      <a id="modal-link" class="modal__link" href="#" target="_blank" rel="noopener noreferrer">Read PDF</a>
    </div>
  </div>

  <!-- Toast Notifications -->
  <div class="toast-container" id="toast-container"></div>

  <!-- JavaScript -->
  <script>
    'use strict';
    (function($) {
      /**
       * Initialize Dexie Database with Unique Constraints on name, coverUrl, and pdfUrl
       */
      const db = new Dexie('MonochromeNovelsDB');
      db.version(31).stores({
        novels: '++id, &name, &coverUrl, &pdfUrl, timestamp', // Unique indexes on name, coverUrl, pdfUrl
        settings: '++id, &key, value' // Store settings like theme
      });

      // Constants
      const PAGE_SIZE = 20; // Number of novels to load per page
      let currentPage = 0; // Current page index
      let isLoading = false; // Flag to prevent multiple simultaneous loads
      let hasMore = true; // Flag to determine if more novels are available
      let currentSearchTerm = ''; // Current search term
      let totalNovels = 0; // Total number of novels to be fetched
      let loadedNovels = 0; // Number of novels loaded so far

      const PLACEHOLDER_IMAGE = 'https://via.placeholder.com/500x700?text=No+Image'; // Placeholder for missing images

      /**
       * Debounce Function to Limit Function Execution Rate
       * @param {Function} func
       * @param {number} delay
       * @returns {Function}
       */
      const debounce = (func, delay) => {
        let debounceTimer;
        return function(...args) {
          const context = this;
          clearTimeout(debounceTimer);
          debounceTimer = setTimeout(() => func.apply(context, args), delay);
        }
      };

      /**
       * Utility: Delay Function
       * @param {number} ms
       * @returns {Promise}
       */
      const delay = ms => new Promise(resolve => setTimeout(resolve, ms));

      /**
       * Utility: Retry Operation with Exponential Backoff (3 Attempts)
       * @param {Function} operation
       * @param {number} attempts
       * @param {number} delayDuration
       * @returns {Promise}
       */
      const retryOperation = async (operation, attempts = 3, delayDuration = 1500) => {
        for (let i = 0; i < attempts; i++) {
          try {
            return await operation();
          } catch (error) {
            if (i === attempts - 1) throw error;
            await delay(delayDuration * Math.pow(2, i)); // Exponential backoff
          }
        }
      };

      /**
       * Initialize Intersection Observer for Infinite Scroll using Sentinel Element
       */
      const setupSentinelObserver = () => {
        const sentinel = $('#sentinel').get(0);
        if (!('IntersectionObserver' in window)) {
          // Fallback if IntersectionObserver is not supported
          $(window).on('scroll', () => {
            if ($(window).scrollTop() + $(window).height() >= $(document).height() - 100 && hasMore && !isLoading) {
              loadNextPage();
            }
          });
          return;
        }

        const sentinelObserver = new IntersectionObserver((entries) => {
          entries.forEach(entry => {
            if (entry.isIntersecting && hasMore && !isLoading) {
              loadNextPage();
            }
          });
        }, {
          rootMargin: '100px',
          threshold: 0
        });
        sentinelObserver.observe(sentinel);
      };

      /**
       * Load Next Page of Novels from IndexedDB
       */
      const loadNextPage = async () => {
        if (isLoading) return; // Prevent multiple simultaneous loads
        isLoading = true;
        showLoader();

        try {
          let novels;

          if (currentSearchTerm === '') {
            novels = await db.novels
              .orderBy('name') // Order by name for alphabetical display
              .offset(currentPage * PAGE_SIZE)
              .limit(PAGE_SIZE)
              .toArray();
          } else {
            novels = await db.novels
              .where('name')
              .startsWithIgnoreCase(currentSearchTerm)
              .offset(currentPage * PAGE_SIZE)
              .limit(PAGE_SIZE)
              .toArray();
          }

          if (novels.length < PAGE_SIZE) {
            hasMore = false; // No more novels to load
          }

          if (novels.length > 0) {
            appendNovelsToDisplay(novels);
            currentPage++;
          } else {
            if (currentPage === 0) {
              showTemporaryError('No novels found for the given search term.', 5000);
            }
          }
        } catch (error) {
          console.error('Error loading novels:', error);
          showTemporaryError('An error occurred while loading novels.', 5000);
        } finally {
          hideLoader();
          isLoading = false;
        }
      };

      /**
       * Show Loader
       */
      const showLoader = () => {
        $('#loader').addClass('visible');
      };

      /**
       * Hide Loader
       */
      const hideLoader = () => {
        $('#loader').removeClass('visible');
      };

      /**
       * Display Error Message Temporarily
       * @param {string} message
       * @param {number} duration - Duration in milliseconds
       */
      const showTemporaryError = (message, duration = 5000) => {
        const $content = $('#content');
        // Remove existing error messages
        $content.find('.error-message').remove();

        const $errorDiv = $('<div>', {
          class: 'error-message',
          role: 'alert',
          text: message
        });

        $content.prepend($errorDiv);

        // Fade out after specified duration
        setTimeout(() => {
          $errorDiv.addClass('fade-out');
          // Remove from DOM after fade-out transition
          setTimeout(() => {
            $errorDiv.remove();
          }, 500);
        }, duration);
      };

      /**
       * Append Novels to Display
       * @param {Array} novels
       */
      const appendNovelsToDisplay = novels => {
        const $content = $('#content');
        const $fragment = $(document.createDocumentFragment());

        novels.forEach(novel => {
          const $card = createNovelCard(novel);
          $fragment.append($card);
        });

        $content.append($fragment);
        AOS.refresh(); // Refresh AOS to apply animations to new elements
      };

      /**
       * Create Novel Card Element using jQuery
       * @param {Object} novel
       * @returns {jQuery}
       */
      const createNovelCard = (novel) => {
        const $card = $('<div>', {
          class: 'card',
          tabindex: '0',
          role: 'button',
          'aria-labelledby': `novel-title-${encodeURIComponent(novel.name)}`,
          'data-aos': 'fade-up'
        });

        const $imageContainer = $('<div>', { class: 'card__image-container' });
        const $image = $('<img>', {
          class: 'card__image',
          src: novel.coverUrl || PLACEHOLDER_IMAGE,
          alt: `Cover of ${novel.name}`,
          loading: 'lazy'
        }).on('error', function() {
          $(this).attr('src', PLACEHOLDER_IMAGE);
        });

        $imageContainer.append($image);
        $card.append($imageContainer);

        const $content = $('<div>', { class: 'card__content' });
        const $title = $('<h2>', {
          id: `novel-title-${encodeURIComponent(novel.name)}`,
          class: 'card__title',
          html: novel.name
        });

        $content.append($title);
        $card.append($content);

        // Event Listener to Open Modal
        $card.on('click keypress', (e) => {
          if (e.type === 'click' || (e.type === 'keypress' && (e.key === 'Enter' || e.key === ' '))) {
            e.preventDefault();
            showModal(novel);
          }
        });

        return $card;
      };

      /**
       * Utility: Escape HTML to Prevent XSS
       * @param {string} str
       * @returns {string}
       */
      const escapeHTML = (str) => {
        if (!str) return '';
        return str.replace(/&/g, "&amp;")
                  .replace(/</g, "&lt;")
                  .replace(/>/g, "&gt;")
                  .replace(/"/g, "&quot;")
                  .replace(/'/g, "&#039;");
      };

      /**
       * Modal Functionality
       */
      const $modal = $('#modal');
      const $modalTitle = $('#modal-title');
      const $modalLink = $('#modal-link');
      const $closeBtn = $('.close');

      /**
       * Show Modal with Novel Details
       * @param {Object} novel
       */
      const showModal = (novel) => {
        $modalTitle.text(novel.name);
        $modalLink.attr('href', novel.pdfUrl);
        $modal.addClass('show').attr('aria-hidden', 'false');
        $('body').css('overflow', 'hidden'); // Prevent background scrolling
        $closeBtn.focus(); // Focus on close button for accessibility
      };

      /**
       * Close Modal
       */
      const closeModal = () => {
        $modal.removeClass('show').attr('aria-hidden', 'true');
        $('body').css('overflow', 'auto');
      };

      $closeBtn.on('click', closeModal);

      $(window).on('click', (event) => {
        if ($(event.target).is($modal)) {
          closeModal();
        }
      });

      $(window).on('keydown', (event) => {
        if (event.key === 'Escape' && $modal.hasClass('show')) {
          closeModal();
        }
      });

      /**
       * Search Functionality
       */
      const $searchInput = $('#search-input');

      const handleSearch = debounce(async () => {
        currentSearchTerm = $searchInput.val().trim();
        currentPage = 0;
        hasMore = true;

        const $content = $('#content');
        $content.empty(); // Clear existing content

        // Reload the first page with the new search term
        await loadNextPage();
      }, 300); // 300ms debounce delay

      $searchInput.on('input', handleSearch);

      /**
       * Refresh Data Functionality
       */
      const $refreshButton = $('#refresh-button');
      $refreshButton.on('click', async () => {
        const confirmation = confirm('Are you sure you want to refresh the data? This may take a few moments.');
        if (!confirmation) return;

        isLoading = true;
        showLoader();
        hasMore = true;
        currentPage = 0;
        $refreshButton.prop('disabled', true);

        try {
          // Clear existing data
          await db.novels.clear();

          // Fetch and parse fresh data
          await fetchAndStoreNovels();

          // Reload the first page of novels
          $('#content').empty(); // Clear existing content

          await loadNextPage();

          // Show success toast
          showToast('Data refreshed successfully!', 'success');
        } catch (error) {
          console.error('Error refreshing data:', error);
          showTemporaryError('Failed to refresh data. Please try again later.', 5000);
          // Show error toast
          showToast('Failed to refresh data.', 'error');
        } finally {
          hideLoader();
          isLoading = false;
          $refreshButton.prop('disabled', false);
        }
      });

      /**
       * Initialize Application
       */
      const initializeApp = async () => {
        try {
          // Check if any novels are already stored in IndexedDB
          const count = await db.novels.count();
          if (count === 0) {
            // If not, fetch from the target website
            await fetchAndStoreNovels();
          } else {
            // Validate existing data
            const novels = await db.novels.toArray();
            if (!validateNovels(novels)) {
              await db.novels.clear();
              await fetchAndStoreNovels();
            }
          }

          // Load the first page of novels
          await loadNextPage();
        } catch (error) {
          console.error('Error initializing application:', error);
          showTemporaryError('Failed to load novels. Please try refreshing the page.', 5000);
          // Show error toast
          showToast('Failed to load novels.', 'error');
        }
      };

      /**
       * Fetch and Store Novels
       */
      const fetchAndStoreNovels = async () => {
        try {
          const html = await retryOperation(() => fetchHTML('https://jnovels.com/top-light-novels-to-read/'));
          let novels = parseHTML(html);

          if (novels.length === 0) {
            throw new Error('No novels found on the target page.');
          }

          totalNovels = novels.length;
          loadedNovels = 0;
          showProgress();
          updateProgress(0);

          // Bulk upsert novels to IndexedDB
          const novelsToAdd = novels.map(novel => ({
            ...novel,
            name: escapeHTML(novel.name),
            coverUrl: escapeHTML(novel.coverUrl),
            pdfUrl: escapeHTML(novel.pdfUrl),
            timestamp: Date.now()
          }));

          await db.novels.bulkPut(novelsToAdd);
          loadedNovels = novelsToAdd.length;
          updateProgress(100);

          console.log('Novels fetched and stored successfully:', novelsToAdd.length);

          // Show success toast
          showToast('Novels fetched and stored successfully.', 'success');

          // Clear fetched HTML content
          clearFetchedHTML();
        } catch (error) {
          console.error('Error fetching or storing novels:', error);
          showTemporaryError('Failed to fetch and store novels. Please try again later.', 5000);
          // Show error toast
          showToast('Failed to fetch and store novels.', 'error');
        } finally {
          hideProgress();
        }
      };

      /**
       * Fetch HTML Content with Content-Type Validation via CORS Proxy
       * @param {string} url
       * @returns {Promise<string>}
       */
      const fetchHTML = async (url) => {
        const proxyUrl = `https://api.codetabs.com/v1/proxy?quest=${encodeURIComponent(url)}`;
        try {
          const response = await fetch(proxyUrl, { cache: 'no-cache' });
          
          if (!response.ok) {
            throw new Error(`HTTP error! Status: ${response.status}`);
          }

          const htmlContent = await response.text();
          
          if (!htmlContent || typeof htmlContent !== 'string') {
            throw new Error('Fetched content is invalid or empty.');
          }

          return htmlContent;
        } catch (error) {
          console.error('Error fetching HTML:', error);
          throw error; // Re-throw to be handled by caller
        }
      };

      /**
       * Parse Fetched HTML to Extract Novel Data Based on Provided Schema
       * @param {string} html
       * @returns {Array<Object>}
       */
      const parseHTML = (html) => {
        const parser = new DOMParser();
        const doc = parser.parseFromString(html, 'text/html');
        const novels = [];
        const uniqueNovels = new Set();

        // Select all h3 tags as they contain the novel names and links
        const h3Elements = doc.querySelectorAll('h3');

        h3Elements.forEach((h3Element) => {
          try {
            const aTag = h3Element.querySelector('a');
            const spanTag = h3Element.querySelector('span');

            if (!aTag || !spanTag) return; // Skip if either tag is missing

            const name = spanTag.textContent.trim();
            const pdfLink = aTag.getAttribute('href').trim();

            // The cover image is inside the following p tag
            const pElement = h3Element.nextElementSibling;
            if (!pElement) return; // Skip if p tag is missing

            const imgTag = pElement.querySelector('img');
            if (!imgTag) return; // Skip if img tag is missing

            let coverUrl = imgTag.getAttribute('src') || imgTag.getAttribute('data-src');
            if (!coverUrl) return; // Skip if cover URL is missing

            // Handle different URL formats
            if (coverUrl.startsWith('//')) {
              coverUrl = `https:${coverUrl}`;
            } else if (coverUrl.startsWith('/')) {
              coverUrl = `https://jnovels.com${coverUrl}`;
            } else if (!coverUrl.startsWith('http')) {
              // Handle relative URLs without leading '/'
              coverUrl = `https://jnovels.com/${coverUrl}`;
            }

            // Validate extracted data
            if (name && pdfLink && coverUrl) {
              const novelKey = `${name}-${coverUrl}-${pdfLink}`;
              if (!uniqueNovels.has(novelKey)) {
                uniqueNovels.add(novelKey);
                novels.push({
                  name,
                  coverUrl,
                  pdfUrl: pdfLink
                });
              }
            } else {
              console.warn('Incomplete novel data found and skipped:', { name, pdfLink, coverUrl });
            }
          } catch (error) {
            // Skip any malformed entries
            console.error('Error parsing a novel entry:', error);
          }
        });

        return novels;
      };

      /**
       * Clear Fetched HTML Content
       */
      const clearFetchedHTML = () => {
        // Implementation depends on how HTML content is fetched and stored
        console.log('Clearing fetched HTML content...');
      };

      /**
       * Clear Cache on Before Unload
       */
      const clearCache = () => {
        caches.keys().then(cacheNames => {
          cacheNames.forEach(cacheName => {
            if (cacheName !== 'MonochromeNovelsDB') {
              caches.delete(cacheName);
            }
          });
        });
      };

      window.addEventListener('beforeunload', clearCache);
      document.addEventListener('visibilitychange', () => {
        if (document.visibilityState === 'hidden') {
          clearCache();
        }
      });

      /**
       * Update Progress Bar
       * @param {number} percentage
       */
      const updateProgress = (percentage) => {
        $('#progress-bar').css('width', `${percentage}%`);
        $('#progress-text').text(`${Math.round(percentage)}%`);
      };

      /**
       * Show Progress Bar and Text
       */
      const showProgress = () => {
        $('#progress-container').show();
        $('#progress-text').show();
      };

      /**
       * Hide Progress Bar and Text
       */
      const hideProgress = () => {
        $('#progress-container').hide();
        $('#progress-text').hide();
      };

      /**
       * Validate Novels
       * @param {Array<Object>} novels
       * @returns {boolean}
       */
      const validateNovels = (novels) => {
        for (const novel of novels) {
          if (!novel.name || !novel.coverUrl || !novel.pdfUrl || !novel.timestamp) {
            return false;
          }
        }
        return true;
      };

      /**
       * Toast Notification Functionality
       */
      const showToast = (message, type = 'success') => {
        const $toastContainer = $('#toast-container');
        const $toast = $('<div>', {
          class: `toast ${type}`
        });

        let iconSVG = '';

        if (type === 'success') {
          iconSVG = `
            <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24">
              <path d="M20.285,6.708l-11.7,11.7l-5.566-5.566c-0.391-0.391-1.023-0.391-1.414,0s-0.391,1.023,0,1.414l6.28,6.28
              c0.391,0.391,1.023,0.391,1.414,0l12.544-12.544C20.676,7.731,20.676,7.1,20.285,6.708z"/>
            </svg>
          `;
        } else if (type === 'error') {
          iconSVG = `
            <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24">
              <path d="M12,0C5.373,0,0,5.373,0,12s5.373,12,12,12s12-5.373,12-12S18.627,0,12,0z M16.242,16.242
              c0.391,0.391,0.391,1.023,0,1.414c-0.391,0.391-1.023,0.391-1.414,0L12,13.414l-2.828,2.828c-0.391,0.391-1.023,0.391-1.414,0
              c-0.391-0.391-0.391-1.023,0-1.414L10.586,12l-2.828-2.828c-0.391-0.391-0.391-1.023,0-1.414s1.023-0.391,1.414,0L12,10.586
              l2.828-2.828c0.391-0.391,1.023-0.391,1.414,0s0.391,1.023,0,1.414L13.414,12l2.828,2.828C16.633,15.219,16.633,15.851,16.242,16.242z"/>
            </svg>
          `;
        }

        $toast.html(`${iconSVG} ${message}`);
        $toast.addClass('show');
        $toastContainer.append($toast);

        // Remove toast after 5 seconds
        setTimeout(() => {
          $toast.removeClass('show');
          setTimeout(() => {
            $toast.remove();
          }, 500);
        }, 5000);
      };

      /**
       * Initialize Theme Toggle
       */
      const initializeTheme = async () => {
        const $themeToggle = $('#theme-toggle');
        const themeSetting = await db.settings.get('theme');
        const currentTheme = themeSetting ? themeSetting.value : 'dark';

        if (currentTheme === 'light') {
          $('body').attr('data-theme', 'light');
          $themeToggle.prop('checked', true);
        } else {
          $('body').attr('data-theme', 'dark');
          $themeToggle.prop('checked', false);
        }

        $themeToggle.on('change', async () => {
          const newTheme = $themeToggle.is(':checked') ? 'light' : 'dark';
          $('body').attr('data-theme', newTheme);
          await db.settings.put({ key: 'theme', value: newTheme });
        });
      };

      /**
       * Initialize Menu Button and Menu
       */
      const initializeMenu = () => {
        const $menuButton = $('#menu-button');
        const $menu = $('#menu');
        const $settingsPanel = $('#settings-panel');
        const $settingsPanelClose = $('.settings-panel__close');

        $menuButton.on('click', () => {
          $menu.toggleClass('open');
          if ($menu.hasClass('open')) {
            $('body').css('overflow', 'hidden');
          } else {
            $('body').css('overflow', 'auto');
          }
        });

        $menu.find('.menu__item').on('click', (e) => {
          const target = $(e.target).data('target');
          if (target === 'home') {
            // Redirect to the first page where all novels are displayed
            currentSearchTerm = '';
            currentPage = 0;
            hasMore = true;
            $('#content').empty();
            loadNextPage();
          } else if (target === 'settings') {
            $settingsPanel.addClass('open');
            $('body').css('overflow', 'hidden');
          }
          $menu.removeClass('open');
          $('body').css('overflow', 'auto');
        });

        $settingsPanelClose.on('click', () => {
          $settingsPanel.removeClass('open');
          $('body').css('overflow', 'auto');
        });

        $(window).on('click', (event) => {
          if ($(event.target).is($settingsPanel)) {
            $settingsPanel.removeClass('open');
            $('body').css('overflow', 'auto');
          }
        });

        $(window).on('keydown', (event) => {
          if (event.key === 'Escape' && $settingsPanel.hasClass('open')) {
            $settingsPanel.removeClass('open');
            $('body').css('overflow', 'auto');
          }
        });
      };

      /**
       * Initialize AOS and Start the Application once the DOM is fully loaded
       */
      $(document).ready(() => {
        // Initialize AOS
        AOS.init({
          duration: 800,
          easing: 'ease-in-out',
          once: true,
        });

        setupSentinelObserver();
        initializeApp();
        initializeTheme();
        initializeMenu();
      });

    })(jQuery);
  </script>
</body>
</html>