/* Mobile Enhancements for Quiz App */
/* Optimized for touch devices and small screens */

/* iPhone specific optimizations */
@supports (-webkit-touch-callout: none) {
  * {
    -webkit-font-smoothing: antialiased;
    -webkit-text-size-adjust: 100%;
  }
  
  body {
    -webkit-overflow-scrolling: touch;
    -webkit-transform: translate3d(0, 0, 0);
    transform: translate3d(0, 0, 0);
  }
  
  input, select, textarea, button {
    -webkit-appearance: none;
    border-radius: 0;
  }
  
  button {
    -webkit-tap-highlight-color: transparent;
  }
}

/* Android specific optimizations */
@supports not (-webkit-touch-callout: none) {
  * {
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
  }
  
  body {
    -webkit-overflow-scrolling: touch;
    overflow-scrolling: touch;
    -webkit-transform: translate3d(0, 0, 0);
    transform: translate3d(0, 0, 0);
  }
  
  input:not([type="checkbox"]):not([type="radio"]), select, textarea, button {
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    border-radius: 8px;
  }
  
  button {
    -webkit-tap-highlight-color: transparent;
    -moz-tap-highlight-color: transparent;
    tap-highlight-color: transparent;
  }
  
  /* Android Chrome specific optimizations */
  .container {
    -webkit-overflow-scrolling: touch;
    overflow-scrolling: touch;
  }
  
  /* Better touch targets for Android */
  .btn, .answer, .topic-card {
    min-height: 48px;
    min-width: 48px;
  }
  
  /* Android WebView optimizations */
  input:focus, select:focus, textarea:focus {
    -webkit-user-select: text;
    -moz-user-select: text;
    user-select: text;
  }
}

/* Mobile-first approach */
* {
  -webkit-tap-highlight-color: transparent;
  -webkit-touch-callout: none;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
}

input, textarea, select {
  -webkit-user-select: text;
  -moz-user-select: text;
  -ms-user-select: text;
  user-select: text;
}

/* Enhanced mobile containers */
@media (max-width: 768px) {
  .container {
    margin: 0 !important;
    border-radius: 0 !important;
    padding: 16px !important;
    max-width: 100% !important;
    min-height: 100vh;
    box-shadow: none !important;
    border-top: 6px solid var(--primary-color) !important;
  }

  /* Mobile typography improvements */
  h1 {
    font-size: 1.6rem !important;
    line-height: 1.3 !important;
    margin-bottom: 20px !important;
    text-align: center !important;
  }

  h2 {
    font-size: 1.4rem !important;
    line-height: 1.3 !important;
    margin-bottom: 16px !important;
  }

  h3 {
    font-size: 1.2rem !important;
    line-height: 1.3 !important;
    margin-bottom: 12px !important;
  }

  /* Enhanced mobile buttons */
  .btn {
    min-height: 48px !important;
    font-size: 16px !important;
    padding: 14px 24px !important;
    border-radius: 12px !important;
    touch-action: manipulation;
    font-weight: 600;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    transition: all 0.2s ease;
    /* Android specific optimizations */
    -webkit-tap-highlight-color: transparent;
    -moz-tap-highlight-color: transparent;
    tap-highlight-color: transparent;
  }

  .btn:hover, .btn:active {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
  }

  .btn-outline {
    min-height: 48px !important;
    border-width: 2px !important;
  }

  /* Mobile form elements */
  input[type="text"],
  input[type="email"],
  input[type="password"],
  input[type="number"],
  select,
  textarea {
    min-height: 48px !important;
    font-size: 16px !important;
    padding: 12px 16px !important;
    border-radius: 12px !important;
    border-width: 2px !important;
    transition: all 0.2s ease;
    /* Android specific optimizations */
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    -webkit-tap-highlight-color: transparent;
    -moz-tap-highlight-color: transparent;
    tap-highlight-color: transparent;
  }

  /* Mobile checkbox styling - prevent checkbox from looking like textbox */
  input[type="checkbox"] {
    -webkit-appearance: none !important;
    -moz-appearance: none !important;
    appearance: none !important;
    width: 22px !important;
    height: 22px !important;
    min-width: 22px !important;
    min-height: 22px !important;
    max-width: 22px !important;
    max-height: 22px !important;
    padding: 0 !important;
    margin: 0 4px 0 0 !important;
    border: 2px solid #800020 !important;
    border-radius: 6px !important;
    background: white !important;
    cursor: pointer !important;
    position: relative !important;
    flex-shrink: 0 !important;
    transition: all 0.2s ease !important;
    vertical-align: middle !important;
  }

  input[type="checkbox"]:checked {
    background: #800020 !important;
    border-color: #800020 !important;
  }

  input[type="checkbox"]:checked::after {
    content: '✓' !important;
    position: absolute !important;
    top: 50% !important;
    left: 50% !important;
    transform: translate(-50%, -50%) !important;
    color: white !important;
    font-size: 14px !important;
    font-weight: bold !important;
    line-height: 1 !important;
  }

  input[type="checkbox"]:focus {
    outline: 2px solid rgba(128,0,32,0.3) !important;
    outline-offset: 2px !important;
  }

  /* Ensure checkbox labels work properly */
  label:has(input[type="checkbox"]) {
    display: flex !important;
    align-items: center !important;
    gap: 8px !important;
    cursor: pointer !important;
  }

  input:focus,
  select:focus,
  textarea:focus {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(128, 0, 32, 0.2);
  }

  /* Enhanced mobile quiz interface */
  .question {
    font-size: 1.2rem !important;
    line-height: 1.4 !important;
    margin-bottom: 24px !important;
    padding: 20px !important;
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%) !important;
    border-radius: 16px !important;
    border-left: 4px solid var(--primary-color) !important;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
  }

  /* Enhanced mobile answer options */
  .answer {
    padding: 18px 20px !important;
    margin-bottom: 12px !important;
    border-radius: 16px !important;
    min-height: 60px !important;
    font-size: 16px !important;
    line-height: 1.4 !important;
    border-width: 2px !important;
    transition: all 0.2s ease;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 16px;
  }

  .answer:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
  }

  .answer.selected {
    background: rgba(128, 0, 32, 0.1) !important;
    border-color: var(--primary-color) !important;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(128, 0, 32, 0.2);
  }

  .answer .option {
    min-width: 36px !important;
    height: 36px !important;
    border-radius: 50% !important;
    display: flex !important;
    align-items: center !important;
    justify-content: center !important;
    font-weight: 700 !important;
    font-size: 16px !important;
    background: var(--primary-color);
    color: white;
    flex-shrink: 0;
  }

  .answer .text {
    flex: 1;
    font-weight: 500;
  }

  /* Enhanced mobile progress bar */
  .quiz-progress {
    height: 10px !important;
    margin: 24px 0 !important;
    border-radius: 8px !important;
    background: #e9ecef !important;
    box-shadow: inset 0 1px 3px rgba(0,0,0,0.1);
  }

  #progress-bar {
    border-radius: 8px !important;
    background: linear-gradient(90deg, var(--primary-color) 0%, var(--primary-light) 100%) !important;
    box-shadow: 0 2px 4px rgba(128, 0, 32, 0.3);
  }

  /* Enhanced mobile controls */
  .quiz-controls {
    flex-direction: column !important;
    gap: 20px !important;
    margin: 32px 0 !important;
    padding: 20px 0 !important;
    border-top: 2px solid #e9ecef !important;
    border-bottom: 2px solid #e9ecef !important;
  }

  .quiz-actions {
    width: 100% !important;
    justify-content: space-between !important;
    flex-wrap: wrap;
    gap: 12px;
  }

  .btn-flag {
    min-height: 48px !important;
    padding: 12px 20px !important;
    border-radius: 12px !important;
    font-size: 16px !important;
    display: inline-flex !important;
    align-items: center !important;
    gap: 8px !important;
    width: auto !important;
    height: auto !important;
  }

  /* Enhanced mobile topic cards */
  .topics-grid {
    grid-template-columns: 1fr !important;
    gap: 20px !important;
    margin: 24px 0 !important;
  }

  .topic-card {
    margin-bottom: 0 !important;
    border-radius: 16px !important;
    overflow: hidden !important;
    box-shadow: 0 4px 16px rgba(0,0,0,0.1) !important;
    transition: all 0.3s ease;
  }

  .topic-card:hover {
    transform: translateY(-4px) !important;
    box-shadow: 0 8px 24px rgba(0,0,0,0.15) !important;
  }

  .topic-card-content {
    padding: 24px !important;
    text-align: center;
  }

  .topic-card h3 {
    font-size: 1.3rem !important;
    margin-bottom: 12px !important;
    color: var(--primary-color) !important;
  }

  .topic-card p {
    font-size: 16px !important;
    margin-bottom: 20px !important;
    color: #666 !important;
  }

  .topic-card .btn {
    width: 100% !important;
    justify-content: center !important;
    margin-top: 8px;
  }

  /* Enhanced mobile admin panel */
  .admin-actions {
    flex-direction: column !important;
    gap: 16px !important;
    padding: 20px !important;
    background: #f8f9fa !important;
    border-radius: 16px !important;
    margin-top: 24px !important;
  }

  .admin-actions .btn {
    width: 100% !important;
    justify-content: center !important;
    min-height: 52px !important;
    font-size: 16px !important;
  }

  /* Enhanced mobile forms */
  .form-group {
    margin-bottom: 20px !important;
  }

  .form-group label {
    font-size: 16px !important;
    font-weight: 600 !important;
    margin-bottom: 8px !important;
    color: var(--primary-color) !important;
  }

  /* Enhanced mobile dropdowns */
  select {
    background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='currentColor' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6,9 12,15 18,9'%3e%3c/polyline%3e%3c/svg%3e") !important;
    background-repeat: no-repeat !important;
    background-position: right 12px center !important;
    background-size: 20px !important;
    padding-right: 40px !important;
  }

  /* Enhanced mobile footer */
  .footer-copyright {
    padding: 24px 16px !important;
    font-size: 14px !important;
    line-height: 1.6 !important;
    background: #f8f9fa !important;
    border-top: 2px solid #e9ecef !important;
    margin-top: 40px !important;
  }

  /* Enhanced mobile logo */
  .logo {
    margin-bottom: 24px !important;
    padding: 16px 0 !important;
    border-bottom: 2px solid #e9ecef;
  }

  .logo img {
    height: 60px !important;
    margin-right: 16px !important;
  }

  /* Enhanced mobile welcome section */
  .welcome-section {
    text-align: center;
    padding: 24px 0;
    margin-bottom: 32px;
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    border-radius: 16px;
    border: 2px solid #e9ecef;
  }

  .welcome-section h2 {
    color: var(--primary-color) !important;
    margin-bottom: 12px !important;
    font-size: 1.4rem !important;
  }

  .welcome-section p {
    color: #666 !important;
    font-size: 16px !important;
    margin: 0 !important;
  }

  /* Enhanced mobile admin section */
  .admin-section {
    margin-top: 32px !important;
    text-align: center !important;
    padding: 24px 0 !important;
    border-top: 2px solid #e9ecef !important;
  }

  /* Enhanced mobile empty states */
  .empty-state {
    text-align: center !important;
    padding: 40px 20px !important;
    color: #666 !important;
  }

  .empty-state .material-icons {
    font-size: 4rem !important;
    color: #ddd !important;
    margin-bottom: 16px !important;
    display: block !important;
  }

  .empty-state p {
    font-size: 16px !important;
    margin: 0 !important;
  }

  /* Enhanced mobile modals */
  .modal .modal-content {
    width: 95vw !important;
    max-width: 500px !important;
    max-height: 90vh !important;
    border-radius: 16px !important;
    padding: 24px !important;
    margin: 20px !important;
  }

  .modal .modal-actions {
    flex-direction: column !important;
    gap: 12px !important;
    margin-top: 24px !important;
  }

  .modal .modal-actions .btn {
    width: 100% !important;
  }

  /* Enhanced mobile topic items */
  .topic-item {
    padding: 20px !important;
    margin-bottom: 16px !important;
    border-radius: 16px !important;
    background: white !important;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08) !important;
    border: 2px solid #f1f3f4 !important;
  }

  .topic-info h3 {
    font-size: 1.2rem !important;
    margin-bottom: 8px !important;
    color: var(--primary-color) !important;
  }

  .topic-meta {
    font-size: 14px !important;
    color: #666 !important;
    margin-bottom: 16px !important;
  }

  /* Enhanced mobile file upload */
  .file-upload input[type="file"] {
    padding: 12px !important;
    border: 2px dashed #ccc !important;
    border-radius: 12px !important;
    background: #f8f9fa !important;
    font-size: 16px !important;
    width: 100% !important;
  }

  .file-upload input[type="file"]:focus {
    border-color: var(--primary-color) !important;
    background: rgba(128, 0, 32, 0.05) !important;
  }

  /* Enhanced mobile success/error messages */
  .success {
    background: #d4edda !important;
    color: #155724 !important;
    padding: 12px 16px !important;
    border-radius: 12px !important;
    border: 1px solid #c3e6cb !important;
    font-size: 16px !important;
  }

  .error {
    background: #f8d7da !important;
    color: #721c24 !important;
    padding: 12px 16px !important;
    border-radius: 12px !important;
    border: 1px solid #f5c6cb !important;
    font-size: 16px !important;
  }

  /* Enhanced mobile question counter */
  #question-counter {
    text-align: center !important;
    font-size: 18px !important;
    font-weight: 600 !important;
    color: var(--primary-color) !important;
    margin: 20px 0 !important;
    padding: 12px 20px !important;
    background: rgba(128, 0, 32, 0.1) !important;
    border-radius: 12px !important;
    border: 2px solid rgba(128, 0, 32, 0.2) !important;
  }

  /* Enhanced mobile timer */
  .timer {
    font-size: 18px !important;
    font-weight: 600 !important;
    padding: 8px 16px !important;
    border-radius: 12px !important;
    background: #f8f9fa !important;
    border: 2px solid #e9ecef !important;
  }

  .timer.warning {
    background: #fff3cd !important;
    color: #856404 !important;
    border-color: #ffeaa7 !important;
  }

  .timer.danger {
    background: #f8d7da !important;
    color: #721c24 !important;
    border-color: #f5c6cb !important;
    animation: timerPulse 1s ease-in-out infinite !important;
  }

  /* Enhanced mobile back link */
  .back-link {
    display: inline-flex !important;
    align-items: center !important;
    gap: 8px !important;
    color: var(--primary-color) !important;
    font-weight: 600 !important;
    text-decoration: none !important;
    margin-bottom: 20px !important;
    padding: 12px 16px !important;
    background: rgba(128, 0, 32, 0.1) !important;
    border-radius: 12px !important;
    transition: all 0.2s ease;
  }

  .back-link:hover {
    background: rgba(128, 0, 32, 0.2) !important;
    transform: translateX(-4px);
  }

  /* Enhanced mobile material icons */
  .material-icons {
    font-size: 20px !important;
    vertical-align: middle;
  }

  /* Enhanced mobile grid layouts */
  .content {
    display: flex !important;
    flex-direction: column !important;
    gap: 24px !important;
  }

  /* Enhanced mobile section spacing */
  section {
    margin-bottom: 32px !important;
  }

  section:last-child {
    margin-bottom: 0 !important;
  }

  /* Enhanced mobile header spacing */
  header {
    margin-bottom: 24px !important;
    padding-bottom: 20px !important;
    border-bottom: 2px solid #e9ecef !important;
  }

  /* Enhanced mobile utility classes */
  .mt-4 {
    margin-top: 24px !important;
  }

  .mb-4 {
    margin-bottom: 24px !important;
  }

  .text-center {
    text-align: center !important;
  }

  /* Enhanced mobile animations */
  @keyframes fadeIn {
    from { 
      opacity: 0; 
      transform: translateY(20px);
    }
    to { 
      opacity: 1; 
      transform: translateY(0);
    }
  }

  .topic-card,
  .answer,
  .btn,
  .modal .modal-content {
    animation: fadeIn 0.3s ease-out;
  }

  /* Mobile Statistics Enhancements */
  .desktop-table {
    display: block !important;
  }
  
  .mobile-cards {
    display: none !important;
  }
  
  .desktop-leaderboard {
    display: block !important;
  }
  
  .mobile-leaderboard {
    display: none !important;
  }
  
  /* Mobile Statistics Cards */
  .mobile-cards > div {
    margin-bottom: 16px !important;
    border-radius: 16px !important;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1) !important;
    transition: all 0.3s ease !important;
  }
  
  .mobile-cards > div:hover {
    transform: translateY(-2px) !important;
    box-shadow: 0 6px 16px rgba(0,0,0,0.15) !important;
  }
  
  /* Mobile Leaderboard Cards */
  .mobile-leaderboard > div {
    margin-bottom: 12px !important;
    border-radius: 16px !important;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1) !important;
    transition: all 0.3s ease !important;
  }
  
  .mobile-leaderboard > div:hover {
    transform: translateY(-2px) !important;
    box-shadow: 0 6px 16px rgba(0,0,0,0.15) !important;
  }
  
  /* Mobile Action Buttons */
  .mobile-cards button,
  .mobile-leaderboard button {
    min-height: 48px !important;
    font-size: 14px !important;
    padding: 12px 16px !important;
    border-radius: 12px !important;
    font-weight: 600 !important;
    transition: all 0.2s ease !important;
    touch-action: manipulation !important;
  }
  
  .mobile-cards button:active,
  .mobile-leaderboard button:active {
    transform: scale(0.98) !important;
  }

  /* Enhanced mobile scroll behavior */
  html {
    scroll-behavior: smooth;
  }

  /* Enhanced mobile focus states */
  .btn:focus,
  input:focus,
  select:focus,
  textarea:focus {
    outline: 3px solid rgba(128, 0, 32, 0.3) !important;
    outline-offset: 2px !important;
  }

  /* Enhanced mobile touch feedback */
  .btn:active,
  .answer:active {
    transform: scale(0.98);
  }
}

/* Extra small devices (phones in portrait) */
@media (max-width: 480px) {
  .container {
    padding: 12px !important;
  }

  h1 {
    font-size: 1.4rem !important;
  }

  h2 {
    font-size: 1.3rem !important;
  }

  h3 {
    font-size: 1.1rem !important;
  }

  .btn {
    padding: 12px 20px !important;
    font-size: 15px !important;
  }

  .question {
    font-size: 1.1rem !important;
    padding: 16px !important;
  }

  .answer {
    padding: 16px !important;
    font-size: 15px !important;
  }

  .topic-card-content {
    padding: 20px !important;
  }

  .modal .modal-content {
    width: 98vw !important;
    margin: 10px !important;
    padding: 20px !important;
  }
}

/* Landscape orientation adjustments */
@media (max-width: 768px) and (orientation: landscape) {
  .container {
    padding: 12px !important;
  }

  .welcome-section {
    padding: 16px 0 !important;
    margin-bottom: 20px !important;
  }

  .quiz-controls {
    margin: 20px 0 !important;
    padding: 16px 0 !important;
  }

  .admin-actions {
    padding: 16px !important;
  }
}

/* High DPI displays */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
  .material-icons {
    font-size: 22px !important;
  }
}

/* Performance optimizations for mobile */
@media (max-width: 768px) {
  * {
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
    -webkit-perspective: 1000;
    perspective: 1000;
    -webkit-transform: translate3d(0, 0, 0);
    transform: translate3d(0, 0, 0);
  }
  
  /* Optimize animations for mobile */
  .btn,
  .answer,
  .topic-card,
  .modal-content {
    will-change: transform;
  }
  
  /* Reduce motion for users who prefer it */
  @media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
      animation-duration: 0.01ms !important;
      animation-iteration-count: 1 !important;
      transition-duration: 0.01ms !important;
    }
  }
  
  
  /* Safe area support for notched devices */
  .container {
    padding-left: max(16px, env(safe-area-inset-left)) !important;
    padding-right: max(16px, env(safe-area-inset-right)) !important;
    padding-top: max(16px, env(safe-area-inset-top)) !important;
    padding-bottom: max(16px, env(safe-area-inset-bottom)) !important;
  }
  
  /* Optimize for landscape orientation */
  @media (max-width: 768px) and (orientation: landscape) {
    .container {
      padding: 8px !important;
    }
    
    .welcome-section {
      padding: 12px 0 !important;
      margin-bottom: 16px !important;
    }
    
    .quiz-controls {
      margin: 16px 0 !important;
      padding: 12px 0 !important;
    }
    
    .admin-actions {
      padding: 12px !important;
    }
    
    .modal .modal-content {
      max-height: 80vh !important;
      overflow-y: auto !important;
    }
  }
  
  /* Battery saving mode optimizations */
  @media (prefers-reduced-motion: no-preference) {
    .btn:hover {
      transform: translateY(-2px) !important;
      box-shadow: 0 4px 12px rgba(0,0,0,0.15) !important;
    }
    
    .answer:hover {
      transform: translateY(-1px) !important;
      box-shadow: 0 2px 8px rgba(0,0,0,0.1) !important;
    }
    
    .topic-card:hover {
      transform: translateY(-4px) !important;
      box-shadow: 0 8px 24px rgba(0,0,0,0.15) !important;
    }
  }
}

/* Android specific optimizations */
@supports not (-webkit-touch-callout: none) {
  /* Android Chrome and WebView optimizations */
  .container {
    -webkit-overflow-scrolling: touch;
    overflow-scrolling: touch;
    -webkit-transform: translateZ(0);
    transform: translateZ(0);
  }
  
  /* Better scrolling on Android */
  body {
    -webkit-overflow-scrolling: touch;
    overflow-scrolling: touch;
  }
  
  /* Android touch feedback */
  .btn:active,
  .answer:active,
  .topic-card:active {
    background-color: rgba(128, 0, 32, 0.1);
    transform: scale(0.98);
    transition: all 0.1s ease;
  }
  
  /* Android form optimizations */
  input:focus,
  select:focus,
  textarea:focus {
    -webkit-user-select: text;
    -moz-user-select: text;
    user-select: text;
    background-color: rgba(128, 0, 32, 0.05);
  }
  
  /* Android keyboard handling */
  @media (max-width: 768px) {
    .container {
      min-height: 100vh;
      min-height: -webkit-fill-available;
    }
    
    /* Prevent zoom on input focus for Android */
    input[type="text"],
    input[type="email"],
    input[type="password"],
    input[type="number"],
    select,
    textarea {
      font-size: 16px !important;
    }
  }
  
  /* Android Chrome address bar handling */
  @media (max-height: 500px) and (orientation: landscape) {
    .container {
      padding: 8px !important;
    }
    
    .welcome-section {
      padding: 8px 0 !important;
      margin-bottom: 8px !important;
    }
    
    .quiz-controls {
      margin: 8px 0 !important;
      padding: 8px 0 !important;
    }
  }
  
  /* Android performance optimizations */
  .btn,
  .answer,
  .topic-card,
  .modal-content {
    will-change: transform;
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
    -webkit-perspective: 1000;
    perspective: 1000;
  }
  
  /* Android specific animations */
  @media (prefers-reduced-motion: no-preference) {
    .btn:hover {
      transform: translateY(-2px) scale(1.02);
      box-shadow: 0 6px 16px rgba(0,0,0,0.15);
    }
    
    .answer:hover {
      transform: translateY(-1px) scale(1.01);
      box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    }
    
    .topic-card:hover {
      transform: translateY(-4px) scale(1.02);
      box-shadow: 0 10px 28px rgba(0,0,0,0.15);
    }
  }
}

/* Mobile Statistics Override */
@media (max-width: 768px) {
  .desktop-table {
    display: none !important;
  }
  
  .mobile-cards {
    display: block !important;
  }
  
  .desktop-leaderboard {
    display: none !important;
  }
  
  .mobile-leaderboard {
    display: block !important;
  }
  
  /* Mobile Statistics Cards Styling */
  .mobile-cards > div {
    margin-bottom: 16px !important;
    border-radius: 16px !important;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1) !important;
    transition: all 0.3s ease !important;
    background: white !important;
  }
  
  .mobile-cards > div:hover {
    transform: translateY(-2px) !important;
    box-shadow: 0 6px 16px rgba(0,0,0,0.15) !important;
  }
  
  /* Mobile Leaderboard Cards Styling */
  .mobile-leaderboard > div {
    margin-bottom: 12px !important;
    border-radius: 16px !important;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1) !important;
    transition: all 0.3s ease !important;
    background: white !important;
  }
  
  .mobile-leaderboard > div:hover {
    transform: translateY(-2px) !important;
    box-shadow: 0 6px 16px rgba(0,0,0,0.15) !important;
  }
  
  /* Mobile Action Buttons Styling */
  .mobile-cards button,
  .mobile-leaderboard button {
    min-height: 48px !important;
    font-size: 14px !important;
    padding: 12px 16px !important;
    border-radius: 12px !important;
    font-weight: 600 !important;
    transition: all 0.2s ease !important;
    touch-action: manipulation !important;
    border: none !important;
    cursor: pointer !important;
  }
  
  .mobile-cards button:active,
  .mobile-leaderboard button:active {
    transform: scale(0.98) !important;
  }
  
  /* Mobile Statistics Grid */
  .mobile-cards .grid-stats {
    display: grid !important;
    grid-template-columns: 1fr 1fr !important;
    gap: 12px !important;
    margin-bottom: 16px !important;
  }
  
  .mobile-cards .stat-item {
    text-align: center !important;
    padding: 12px !important;
    background: #f8f9fa !important;
    border-radius: 12px !important;
    border: 1px solid #e9ecef !important;
  }
  
  .mobile-cards .stat-label {
    font-size: 14px !important;
    color: #666 !important;
    margin-bottom: 6px !important;
    font-weight: 500 !important;
  }
  
  .mobile-cards .stat-value {
    font-size: 18px !important;
    font-weight: 600 !important;
    color: #333 !important;
  }
  
  /* Mobile Action Buttons Container */
  .mobile-cards .action-buttons {
    display: flex !important;
    gap: 8px !important;
    flex-wrap: wrap !important;
    margin-top: 16px !important;
  }
  
  .mobile-cards .action-buttons button {
    flex: 1 !important;
    min-width: 120px !important;
    justify-content: center !important;
  }
  
  /* Enhanced Mobile Statistics Modal */
  .modal .modal-content {
    max-width: 96vw !important;
    max-height: 92vh !important;
    overflow-y: auto !important;
    padding: 16px 12px !important;
    margin: 8px auto !important;
    border-radius: 20px !important;
  }
  
  /* Mobile Statistics Header */
  .modal .modal-header {
    padding: 6px 0 !important;
    margin-bottom: 10px !important;
    border-bottom: 1px solid #e9ecef !important;
    display: flex !important;
    justify-content: space-between !important;
    align-items: center !important;
  }
  
  .modal .modal-header h3 {
    font-size: 15px !important;
    font-weight: 600 !important;
    color: #800020 !important;
    margin: 0 !important;
    line-height: 1.2 !important;
  }
  
  .modal .modal-header h3 .material-icons {
    font-size: 18px !important;
    vertical-align: middle !important;
    margin-right: 3px !important;
  }
  
  .modal .close-btn {
    width: 32px !important;
    height: 32px !important;
    font-size: 22px !important;
    border-radius: 50% !important;
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%) !important;
    border: 1px solid #dee2e6 !important;
    cursor: pointer !important;
    transition: all 0.2s ease !important;
    display: flex !important;
    align-items: center !important;
    justify-content: center !important;
    flex-shrink: 0 !important;
    line-height: 1 !important;
  }
  
  .modal .close-btn:active {
    transform: scale(0.9) !important;
    background: linear-gradient(135deg, #e9ecef 0%, #dee2e6 100%) !important;
  }
  
  /* Mobile Statistics Content */
  .modal .statistics-content {
    padding: 0 !important;
  }
  
  .modal .statistics-section {
    margin-bottom: 24px !important;
  }
  
  .modal .statistics-section h4 {
    font-size: 18px !important;
    font-weight: 600 !important;
    color: #333 !important;
    margin-bottom: 16px !important;
    padding-bottom: 8px !important;
    border-bottom: 1px solid #e9ecef !important;
  }
  
  /* Mobile Statistics Cards */
  .modal .stat-card {
    background: white !important;
    border-radius: 18px !important;
    padding: 24px 18px !important;
    margin-bottom: 20px !important;
    box-shadow: 0 6px 20px rgba(0,0,0,0.12) !important;
    border: 2px solid #e8e8e8 !important;
  }
  
  .modal .stat-card-header {
    display: flex !important;
    justify-content: space-between !important;
    align-items: flex-start !important;
    margin-bottom: 20px !important;
    padding-bottom: 12px !important;
    border-bottom: 2px solid #f0f0f0 !important;
  }
  
  .modal .stat-card-title {
    font-size: 18px !important;
    font-weight: 700 !important;
    color: #333 !important;
    line-height: 1.4 !important;
    max-width: 70% !important;
  }
  
  .modal .stat-card-type {
    background: linear-gradient(135deg, #f0f0f0 0%, #e8e8e8 100%) !important;
    color: #555 !important;
    padding: 6px 12px !important;
    border-radius: 14px !important;
    font-size: 13px !important;
    font-weight: 600 !important;
    white-space: nowrap !important;
  }
  
  .modal .stat-grid {
    display: grid !important;
    grid-template-columns: 1fr 1fr !important;
    gap: 14px !important;
    margin-bottom: 20px !important;
  }
  
  .modal .stat-item {
    text-align: center !important;
    padding: 20px 14px !important;
    background: linear-gradient(135deg, #f8f9fa 0%, #f0f2f5 100%) !important;
    border-radius: 14px !important;
    border: 2px solid #e8e8e8 !important;
  }
  
  .modal .stat-value {
    font-size: 28px !important;
    font-weight: 800 !important;
    color: #800020 !important;
    margin-bottom: 8px !important;
    line-height: 1 !important;
  }
  
  .modal .stat-label {
    font-size: 14px !important;
    color: #666 !important;
    font-weight: 600 !important;
    line-height: 1.3 !important;
  }
  
  /* Mobile Action Buttons */
  .modal .action-buttons {
    display: flex !important;
    flex-direction: row !important;
    flex-wrap: wrap !important;
    gap: 10px !important;
    margin-top: 24px !important;
    padding-top: 20px !important;
    border-top: 2px solid #e9ecef !important;
  }
  
  .modal .action-btn {
    flex: 1 !important;
    min-width: calc(50% - 5px) !important;
    min-height: 54px !important;
    padding: 14px 16px !important;
    border-radius: 12px !important;
    font-size: 15px !important;
    font-weight: 700 !important;
    border: none !important;
    cursor: pointer !important;
    transition: all 0.2s ease !important;
    display: flex !important;
    align-items: center !important;
    justify-content: center !important;
    gap: 6px !important;
    text-transform: none !important;
    letter-spacing: 0.2px !important;
  }
  
  .modal .action-btn .material-icons {
    font-size: 20px !important;
  }
  
  /* Hide CSV export button on all platforms */
  button[onclick*="exportWrongAnswers"]:not([onclick*="Excel"]),
  button:has(.material-icons):contains("Xuất CSV"),
  .btn:contains("Xuất CSV"),
  [class*="btn"][onclick*="exportWrongAnswers("],
  button[id*="export-csv"],
  .action-btn:nth-child(2),
  .result-actions-grid .btn:nth-child(2) {
    display: none !important;
  }
  
  .modal .action-btn-primary {
    background: linear-gradient(135deg, #800020 0%, #a00028 100%) !important;
    color: white !important;
    box-shadow: 0 6px 16px rgba(128, 0, 32, 0.35) !important;
  }
  
  .modal .action-btn-primary:active {
    transform: translateY(2px) !important;
    box-shadow: 0 3px 10px rgba(128, 0, 32, 0.3) !important;
  }
  
  .modal .action-btn-secondary {
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%) !important;
    color: #333 !important;
    border: 3px solid #dee2e6 !important;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1) !important;
  }
  
  .modal .action-btn-secondary:active {
    transform: translateY(2px) !important;
    background: linear-gradient(135deg, #e9ecef 0%, #dee2e6 100%) !important;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1) !important;
  }
  
  .modal .action-btn-danger {
    background: linear-gradient(135deg, #ffebee 0%, #ffcdd2 100%) !important;
    color: #c62828 !important;
    border: 3px solid #ffcdd2 !important;
    box-shadow: 0 4px 12px rgba(198, 40, 40, 0.2) !important;
    font-weight: 700 !important;
  }
  
  .modal .action-btn-danger:active {
    transform: translateY(2px) !important;
    background: linear-gradient(135deg, #ffcdd2 0%, #ffb3ba 100%) !important;
    box-shadow: 0 2px 8px rgba(198, 40, 40, 0.2) !important;
  }
  
  /* Mobile Leaderboard Cards */
  .modal .leaderboard-card {
    background: white !important;
    border-radius: 16px !important;
    padding: 20px !important;
    margin-bottom: 16px !important;
    box-shadow: 0 4px 16px rgba(0,0,0,0.08) !important;
    border: 1px solid #e8e8e8 !important;
  }
  
  .modal .leaderboard-rank {
    display: flex !important;
    align-items: center !important;
    gap: 16px !important;
    margin-bottom: 12px !important;
  }
  
  .modal .rank-number {
    width: 40px !important;
    height: 40px !important;
    border-radius: 50% !important;
    display: flex !important;
    align-items: center !important;
    justify-content: center !important;
    font-weight: 800 !important;
    font-size: 16px !important;
    box-shadow: 0 2px 8px rgba(0,0,0,0.15) !important;
  }
  
  .modal .rank-1 {
    background: linear-gradient(135deg, #ffd700 0%, #ffed4e 100%) !important;
    color: #333 !important;
  }
  
  .modal .rank-2 {
    background: linear-gradient(135deg, #c0c0c0 0%, #e8e8e8 100%) !important;
    color: #333 !important;
  }
  
  .modal .rank-3 {
    background: linear-gradient(135deg, #cd7f32 0%, #daa520 100%) !important;
    color: white !important;
  }
  
  .modal .rank-other {
    background: linear-gradient(135deg, #f0f0f0 0%, #e8e8e8 100%) !important;
    color: #666 !important;
  }
  
  .modal .leaderboard-info {
    flex: 1 !important;
  }
  
  .modal .leaderboard-name {
    font-size: 16px !important;
    font-weight: 700 !important;
    color: #333 !important;
    margin-bottom: 6px !important;
    line-height: 1.3 !important;
  }
  
  .modal .leaderboard-details {
    font-size: 13px !important;
    color: #666 !important;
    line-height: 1.3 !important;
  }
  
  .modal .leaderboard-score {
    text-align: right !important;
  }
  
  .modal .score-value {
    font-size: 24px !important;
    font-weight: 800 !important;
    color: #800020 !important;
    margin-bottom: 6px !important;
    line-height: 1 !important;
  }
  
  .modal .score-details {
    font-size: 13px !important;
    color: #666 !important;
    line-height: 1.2 !important;
  }
  
  /* Mobile Empty States */
  .modal .empty-state {
    text-align: center !important;
    padding: 40px 20px !important;
    color: #666 !important;
  }
  
  .modal .empty-state .material-icons {
    font-size: 4rem !important;
    color: #ddd !important;
    margin-bottom: 16px !important;
    display: block !important;
  }
  
  .modal .empty-state p {
    font-size: 16px !important;
    margin: 0 !important;
    line-height: 1.4 !important;
  }
  
  /* Mobile Scroll Optimization */
  .modal .modal-content::-webkit-scrollbar {
    width: 6px !important;
  }
  
  .modal .modal-content::-webkit-scrollbar-track {
    background: #f1f1f1 !important;
    border-radius: 3px !important;
  }
  
  .modal .modal-content::-webkit-scrollbar-thumb {
    background: #c1c1c1 !important;
    border-radius: 3px !important;
  }
  
  .modal .modal-content::-webkit-scrollbar-thumb:hover {
    background: #a8a8a8 !important;
  }
}