:root {
      --primary: #D34B26;
      --primary-dark: #7C392A;
      --secondary: #F99940;
      --dark: #110E10;
      --light: #CCAA85;
      --gray: #D77C3F;
      --success: #E19251;
      --shadow: 0 4px 6px -1px rgba(17, 14, 16, 0.2);
      --transition: all 0.3s ease;
      --header-height: 70px;
    }
    
    /* Base Styles */
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
      font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
      -webkit-tap-highlight-color: transparent;
    }
    
    html {
      scroll-behavior: smooth;
    }
    
    body {
      background-color: var(--light);
      color: var(--dark);
      line-height: 1.6;
      padding-top: var(--header-height);
    }
    
    a {
      text-decoration: none;
      color: inherit;
    }
    
    /* Header Styles */
    .header {
      background-color: white;
      box-shadow: var(--shadow);
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      z-index: 1000;
      padding: 0.8rem 1.5rem;
      display: flex;
      justify-content: space-between;
      align-items: center;
      transition: var(--transition);
      height: var(--header-height);
    }
    
    .logo {
      display: flex;
      align-items: center;
      gap: 0.5rem;
      font-weight: bold;
      color: var(--primary);
      font-size: 1.3rem;
      text-decoration: none;
      transition: var(--transition);
    }
    
    .logo:hover {
      transform: scale(1.05);
    }
    
    .search-container {
      flex: 1;
      max-width: 500px;
      margin: 0 1.5rem;
      position: relative;
    }
    
    .search-form {
      display: flex;
      transition: var(--transition);
    }
    
    .search-input {
      flex: 1;
      padding: 0.6rem 1rem;
      border-radius: 50px 0 0 50px;
      border: 1px solid #ccc;
      outline: none;
      transition: var(--transition);
      font-size: 0.95rem;
    }
    
    .search-input:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 2px rgba(211, 75, 38, 0.2);
    }
    
    .search-button {
      background: var(--primary);
      border: none;
      padding: 0 1.2rem;
      border-radius: 0 50px 50px 0;
      color: white;
      cursor: pointer;
      transition: var(--transition);
      display: flex;
      align-items: center;
      justify-content: center;
    }
    
    .search-button:hover {
      background: var(--primary-dark);
    }
    
    #suggestionsList,
    #mobileSuggestionsList {
      position: absolute;
      background: white;
      list-style: none;
      padding: 0;
      margin: 5px 0 0;
      border-radius: 8px;
      box-shadow: var(--shadow);
      display: none;
      width: 100%;
      z-index: 1000;
      max-height: 300px;
      overflow-y: auto;
      animation: fadeIn 0.3s ease-out;
    }
    
    @keyframes fadeIn {
      from {
        opacity: 0;
        transform: translateY(-10px);
      }
      to {
        opacity: 1;
        transform: translateY(0);
      }
    }
    
    #suggestionsList li,
    #mobileSuggestionsList li {
      padding: 10px;
      cursor: pointer;
      transition: var(--transition);
      font-size: 0.95rem;
    }
    
    #suggestionsList li:hover,
    #mobileSuggestionsList li:hover {
      background: var(--light);
    }
    
    /* Nav links */
    .nav-links {
      display: flex;
      gap: 1.2rem;
    }
    
    .nav-links a {
      text-decoration: none;
      color: var(--dark);
      font-weight: 500;
      position: relative;
      padding: 5px 0;
      transition: var(--transition);
      font-size: 0.95rem;
    }
    
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background-color: var(--primary);
      transition: var(--transition);
    }
    
    .nav-links a:hover::after {
      width: 100%;
    }
    
    .nav-links a:hover {
      color: var(--primary);
    }
    
    .header-actions {
      display: flex;
      align-items: center;
      gap: 0.8rem;
    }
    
    .theme-toggle {
      background: none;
      border: none;
      font-size: 1.2rem;
      cursor: pointer;
      color: var(--dark);
      transition: var(--transition);
      padding: 5px;
    }
    
    .theme-toggle:hover {
      color: var(--primary);
      transform: rotate(30deg);
    }
    
    .auth-buttons {
      display: flex;
      gap: 0.8rem;
    }
    
    .auth-buttons .btn {
      padding: 0.5rem 1rem;
      border-radius: 5px;
      font-weight: 500;
      cursor: pointer;
      border: 1px solid var(--primary);
      background: none;
      color: var(--primary);
      transition: var(--transition);
      font-size: 0.9rem;
      white-space: nowrap;
    }
    
    .auth-buttons .btn:hover {
      transform: translateY(-2px);
      box-shadow: 0 4px 8px rgba(0,0,0,0.1);
    }
    
    .btn-signup {
      background: var(--primary);
      color: white;
    }
    
    .btn-signup:hover {
      background: var(--primary-dark);
    }
    
    .share-button {
      background-color: var(--primary);
      color: white;
      border: none;
      padding: 8px 12px;
      border-radius: 5px;
      cursor: pointer;
      transition: var(--transition);
      display: flex;
      align-items: center;
      gap: 5px;
      font-size: 0.9rem;
    }
    
    .share-button:hover {
      background-color: var(--primary-dark);
      transform: scale(1.05);
    }
    
    .mobile-menu-btn {
      display: none;
      font-size: 1.5rem;
      background: none;
      border: none;
      cursor: pointer;
      color: var(--dark);
      transition: var(--transition);
      padding: 5px;
    }
    
    .mobile-menu-btn:hover {
      color: var(--primary);
    }
    
    /* Mobile Menu */
    .mobile-menu {
      position: fixed;
      top: 0;
      right: -100%;
      width: 85%;
      max-width: 350px;
      height: 100vh;
      background: #fff;
      box-shadow: -2px 0 10px rgba(0, 0, 0, 0.1);
      padding: 1.5rem;
      transition: var(--transition);
      z-index: 999;
      overflow-y: auto;
    }
    
    .mobile-menu.active {
      right: 0;
    }
    
    .mobile-menu-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 1.5rem;
      padding-bottom: 1rem;
      border-bottom: 1px solid #eee;
    }
    
    .mobile-menu-close {
      background: none;
      border: none;
      font-size: 1.5rem;
      cursor: pointer;
      color: var(--dark);
      transition: var(--transition);
      padding: 5px;
    }
    
    .mobile-menu-close:hover {
      color: var(--primary);
      transform: rotate(90deg);
    }
    
    .mobile-search-container {
      margin-bottom: 1.5rem;
    }
    
    .mobile-nav-links {
      display: flex;
      flex-direction: column;
      gap: 0.8rem;
    }
    
    .mobile-nav-links a,
    .mobile-nav-links button {
      text-decoration: none;
      color: var(--dark);
      font-weight: 500;
      background: none;
      border: none;
      text-align: left;
      padding: 10px;
      border-radius: 5px;
      transition: var(--transition);
      font-size: 1rem;
      display: block;
    }
    
    .mobile-nav-links a:hover,
    .mobile-nav-links button:hover {
      background: rgba(211, 75, 38, 0.1);
      color: var(--primary);
      padding-left: 15px;
    }
    
    /* Overlay for mobile menu */
    .mobile-overlay {
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      bottom: 0;
      background: rgba(0,0,0,0.5);
      z-index: 998;
      opacity: 0;
      visibility: hidden;
      transition: var(--transition);
    }
    
    .mobile-overlay.active {
      opacity: 1;
      visibility: visible;
    }
    
    /* Test Page Styles */
    .ads {
      text-align: center;
      margin: 10px auto;
    }
    
    .main-layout {
      display: flex;
      justify-content: center;
      align-items: flex-start;
      padding: 20px;
      max-width: 1200px;
      margin: 0 auto;
    }
    
    .ad-side {
      width: 120px;
      min-height: 600px;
      position: sticky;
      top: calc(var(--header-height) + 20px);
    }
    
    .test-container {
      background: #000000;
      padding: 30px;
      border-radius: 12px;
      box-shadow: 0 8px 15px rgba(0, 0, 0, 0.1);
      width: 100%;
      max-width: 600px;
      color: #f4f4f4;
      text-align: center;
      box-sizing: border-box;
      position: relative;
      margin: 0 20px;
    }
    
    .test-logo {
      width: 90px;
      height: 90px;
      border-radius: 50%;
      border: 4px solid white;
      margin: 20px auto;
      display: block;
      object-fit: cover;
      margin-top: -20px;
    }
    
    .test-container h2 {
      font-size: 20px;
      margin-bottom: 20px;
      text-transform: uppercase;
      color: white;
    }
    
    .test-container input, 
    .test-container button {
      padding: 12px;
      margin: 10px 0;
      width: 100%;
      font-size: 16px;
      border-radius: 8px;
      box-sizing: border-box;
    }
    
    .test-container input {
      border: 1px solid #ddd;
    }
    
    .test-container button {
      background: #27008a;
      color: white;
      border: none;
      cursor: pointer;
      transition: var(--transition);
    }
    
    .test-container button:hover {
      background: linear-gradient(135deg, RED, rgb(0, 0, 99));
      transform: scale(1.05);
    }
    
    .question-box {
      margin-bottom: 30px;
    }
    
    .question {
      font-size: 18px;
      font-weight: bold;
      margin-bottom: 20px;
      color: #ffffff;
    }
    
    .options button {
      display: block;
      margin: 8px 0;
      padding: 15px;
      width: 100%;
      border: none;
      border-radius: 8px;
      cursor: pointer;
      background: #f4f4f4;
      color: #333;
      font-size: 15px;
      transition: 0.3s;
    }
    
    .options button:hover {
      background: #a662ee;
      color: white;
      transform: scale(1.05);
    }
    
    .options button.correct { background: #4CAF50; color: white; }
    .options button.wrong { background: #F44336; color: white; }
    
    .navigation-buttons {
      display: flex;
      justify-content: center;
      gap: 10px;
      margin-top: 20px;
    }
    
    .navigation-buttons button {
      width: 40%;
      padding: 10px;
      border-radius: 8px;
      font-size: 16px;
      border: none;
      background: #780182;
      color: white;
      cursor: pointer;
    }
    
    .navigation-buttons button:hover {
      background: #ff0000;
      transform: scale(1.05);
    }
    
    #timer {
      font-size: 18px;
      color: #ffffff;
      margin-top: 20px;
    }
    
    #result, #popup { 
      display: none; 
      text-align: center; 
      margin-top: 20px; 
    }
    
    .popup {
      position: fixed;
      top: 20px;
      left: 50%;
      transform: translateX(-50%);
      background-color: #4caf50;
      color: white;
      padding: 15px 25px;
      border-radius: 8px;
      font-weight: bold;
      font-size: 16px;
      z-index: 9999;
      box-shadow: 0 4px 8px rgba(0,0,0,0.2);
      max-width: 90%;
      text-align: center;
    }
    
    .stars span { 
      font-size: 24px; 
      color: gold; 
    }
    
    .correct {
      background-color: #d4edda;
      color: #155724;
    }
    
    .wrong {
      background-color: #f8d7da;
      color: #721c24;
    }
    
    .review-question {
      margin-bottom: 15px;
    }
    
    #reviewContainer {
      padding: 10px;
      background: #000000;
      border: 1px solid #ccc;
      display: none;
      margin-top: 20px;
      border-radius: 8px;
    }
    
    /* Loading Screen */
    .loader {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-color: rgba(255, 255, 255, 0.9);
      display: flex;
      justify-content: center;
      align-items: center;
      z-index: 9999;
      transition: opacity 0.5s ease;
    }
    
    .loader-spinner {
      border: 5px solid #f3f3f3;
      border-top: 5px solid var(--primary);
      border-radius: 50%;
      width: 50px;
      height: 50px;
      animation: spin 1s linear infinite;
    }
    
    @keyframes spin {
      0% { transform: rotate(0deg); }
      100% { transform: rotate(360deg); }
    }
    
    .fade-out {
      opacity: 0;
    }
    
    /* Toast Notification */
    .toast {
      position: fixed;
      bottom: 20px;
      left: 50%;
      transform: translateX(-50%);
      background-color: #333;
      color: white;
      padding: 12px 24px;
      border-radius: 4px;
      z-index: 1000;
      opacity: 0;
      transition: opacity 0.3s ease;
    }
    
    .toast.show {
      opacity: 1;
    }
    
    /* Back to Top Button */
    .back-to-top {
      position: fixed;
      bottom: 20px;
      right: 20px;
      background-color: var(--primary);
      color: white;
      width: 50px;
      height: 50px;
      border-radius: 50%;
      display: flex;
      justify-content: center;
      align-items: center;
      cursor: pointer;
      opacity: 0;
      visibility: hidden;
      transition: all 0.3s ease;
      z-index: 999;
    }
    
    .back-to-top.active {
      opacity: 1;
      visibility: visible;
    }
    
    .back-to-top:hover {
      background-color: var(--primary-dark);
      transform: translateY(-5px);
    }
    
    /* Dark Mode Styles */
    body.dark-mode {
      background-color: #121212;
      color: #f5f5f5;
    }
    
    body.dark-mode .header {
      background-color: #1e1e1e;
      box-shadow: 0 2px 10px rgba(0,0,0,0.5);
    }
    
    body.dark-mode .nav-links a,
    body.dark-mode .mobile-nav-links a,
    body.dark-mode .mobile-nav-links button {
      color: #f5f5f5;
    }
    
    body.dark-mode .search-input {
      background-color: #333;
      color: #f5f5f5;
      border-color: #444;
    }
    
    body.dark-mode .mobile-menu {
      background-color: #1e1e1e;
    }
    
    body.dark-mode .mobile-overlay {
      background: rgba(0,0,0,0.7);
    }
    
    body.dark-mode .test-container {
      background-color: #1a1a1a;
      border: 1px solid #333;
    }
    
    body.dark-mode #reviewContainer {
      background-color: #1a1a1a;
      border-color: #333;
    }
    
    body.dark-mode .options button {
      background: #252525;
      color: #f5f5f5;
    }
    
    body.dark-mode .loader {
      background-color: rgba(30, 30, 30, 0.9);
    }
    
    /* Responsive Styles */
    @media (max-width: 1024px) {
      .ad-side {
        display: none;
      }
      
      .test-container {
        margin: 0;
      }
    }
    
    @media (max-width: 768px) {
      .nav-links,
      .auth-buttons,
      .search-container {
        display: none;
      }
      
      .mobile-menu-btn {
        display: block;
      }
      
      .main-layout {
        padding: 20px 10px;
      }
      
      .test-container {
        padding: 20px;
      }
    }
    
    @media (max-width: 576px) {
      .header {
        padding: 0.8rem 1rem;
      }
      
      .logo span {
        font-size: 1.1rem;
      }
      
      .navigation-buttons {
        flex-direction: column;
      }
      
      .navigation-buttons button {
        width: 100%;
      }
    }
    
    @media (max-width: 400px) {
      .logo span {
        display: none;
      }
      
      .test-container h2 {
        font-size: 18px;
      }
    }