@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');
   
    :root {
      --primary-color: #1ab5f4;
      --primary-dark: #1495c7;
      --secondary-color: #64748b;
      --success-color: #059669;
      --warning-color: #e7af26;
      --danger-color: #dc2626;
      --info-color: #0ea5e9;
      --background: #f8fafc;
      --surface: #ffffff;
      --surface-secondary: #f1f5f9;
      --text-primary: #1e293b;
      --text-secondary: #64748b;
      --border-color: #e2e8f0;
      --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
      --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
      --sidebar-width: 280px;
      --topbar-height: 70px;
    }
   
    * { margin: 0; padding: 0; box-sizing: border-box; }
   
    body {
      font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
      background: var(--background);
      color: var(--text-primary);
      line-height: 1.6;
      overflow-x: hidden;
    }

    body.loading .auth-screen,
    body.loading .app-layout,
    body.loading .portal-layout {
        visibility: hidden;
    }

    #confettiCanvas {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      pointer-events: none;
      z-index: 9999;
    }

    /* Authentication Screen */
    .auth-screen {
      min-height: 100vh;
      background: linear-gradient(135deg, var(--primary-color) 0%, var(--warning-color) 100%);
      display: flex;
      align-items: center;
      justify-content: center;
      padding: 1rem;
      position: relative;
    }
   
    .auth-card {
      background: var(--surface);
      border-radius: 16px;
      padding: 3rem;
      max-width: 480px;
      width: 100%;
      box-shadow: var(--shadow-lg);
      border: 1px solid var(--border-color);
    }
   
    .auth-title {
      font-size: 2rem;
      font-weight: 700;
      color: var(--text-primary);
      margin-bottom: 0.5rem;
      text-align: center;
    }
   
    .auth-subtitle {
      color: var(--text-secondary);
      text-align: center;
      margin-bottom: 2rem;
    }
   
    .form-group {
      margin-bottom: 1.5rem;
    }

    .form-group.inline-input {
      position: relative;
    }

    .inline-input .btn {
      position: absolute;
      right: 0.5rem;
      top: 50%;
      transform: translateY(-50%);
      padding: 0.5rem;
    }
   
    .form-label {
      display: block;
      font-weight: 500;
      color: var(--text-primary);
      margin-bottom: 0.5rem;
    }
   
    .form-input {
      width: 100%;
      padding: 0.75rem 1rem;
      border: 2px solid var(--border-color);
      border-radius: 8px;
      font-size: 1rem;
      transition: all 0.2s;
      background: var(--surface);
    }
   
    .form-input:focus {
      outline: none;
      border-color: var(--primary-color);
      box-shadow: 0 0 0 3px rgb(26 181 244 / 0.1);
    }
   
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 0.5rem;
      padding: 0.75rem 1.5rem;
      border: none;
      border-radius: 8px;
      font-size: 0.875rem;
      font-weight: 500;
      cursor: pointer;
      transition: all 0.2s;
      text-decoration: none;
    }
   
    .btn-primary {
      background: var(--primary-color);
      color: var(--surface);
    }
   
    .btn-primary:hover {
      background: var(--primary-dark);
    }
   
    .btn-secondary {
      background: var(--secondary-color);
      color: var(--surface);
    }
   
    .btn-success {
      background: var(--success-color);
      color: var(--surface);
    }
   
    .btn-warning {
      background: var(--warning-color);
      color: var(--surface);
    }
   
    .btn-danger {
      background: var(--danger-color);
      color: var(--surface);
    }

    .btn-info {
      background: var(--info-color);
      color: var(--surface);
    }
   
    .btn-full {
      width: 100%;
      margin-bottom: 1rem;
    }
   
    .btn:disabled {
      opacity: 0.5;
      cursor: not-allowed;
    }
   
    .account-type-selection {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 0.5rem;
      margin-bottom: 1.5rem;
    }
   
    .account-type-btn {
      padding: 1rem;
      border: 2px solid var(--border-color);
      border-radius: 8px;
      background: var(--surface);
      cursor: pointer;
      transition: all 0.2s;
      text-align: center;
      font-weight: 500;
    }
   
    .account-type-btn.active {
      border-color: var(--primary-color);
      background: rgb(26 181 244 / 0.05);
      color: var(--primary-color);
    }
   
    .auth-switch {
      color: var(--primary-color);
      cursor: pointer;
      text-decoration: underline;
    }
   
    .error-message, .success-message {
      padding: 0.75rem;
      border-radius: 6px;
      margin-bottom: 1rem;
      font-size: 0.875rem;
      display: none;
    }
   
    .error-message {
      background: rgb(220 38 38 / 0.1);
      color: var(--danger-color);
      border: 1px solid rgb(220 38 38 / 0.2);
    }
   
    .success-message {
      background: rgb(5 150 105 / 0.1);
      color: var(--success-color);
      border: 1px solid rgb(5 150 105 / 0.2);
    }

    /* Corner Buttons */
    .corner-button {
      position: fixed;
      bottom: 1rem;
      padding: 0.5rem 1rem;
      font-size: 0.875rem;
      color: var(--surface);
      text-decoration: none;
      z-index: 100;
    }

    .about-button {
      left: 1rem;
    }

    .demo-button {
      right: 1rem;
    }

    /* Sidebar Layout */
    .app-layout {
      display: none;
      min-height: 100vh;
    }
   
    .app-layout.active {
      display: flex;
    }
   
    .sidebar {
      width: var(--sidebar-width);
      background: var(--surface);
      border-right: 1px solid var(--border-color);
      box-shadow: var(--shadow);
      position: fixed;
      top: 0;
      left: 0;
      height: 100vh;
      overflow-y: auto;
      z-index: 100;
      transition: transform 0.3s ease;
    }
   
    .sidebar.collapsed {
      transform: translateX(-100%);
    }
    .sidebar-resizer { position: absolute; top: 0; right: -4px; width: 8px; height: 100%; cursor: ew-resize; z-index: 110; touch-action: none; }
    .sidebar-resizer:hover { background: rgb(26 181 244 / 0.35); }
    .sidebar.compact .sidebar-header { justify-content: center; padding: 0.75rem; }
    .sidebar.compact .sidebar-title, .sidebar.compact .nav-section-title, .sidebar.compact .nav-label, .sidebar.compact .user-details { display: none; }
    .sidebar.compact .nav-item { justify-content: center; padding: 0.8rem 0.25rem; border-left-width: 0; }
    .sidebar.compact .nav-icon { width: auto; font-size: 1.35rem; }
    .sidebar.compact .sidebar-footer { padding: 0.75rem 0.25rem; }
    .sidebar.compact .user-info { justify-content: center; }
    .sidebar.compact .sidebar-footer .btn { font-size: 0; padding: 0.75rem; }
    .sidebar.compact .sidebar-footer .btn span { font-size: 1.1rem; }
   
    .sidebar-header {
      padding: 1.5rem;
      border-bottom: 1px solid var(--border-color);
      display: flex;
      align-items: center;
      gap: 0.75rem;
      position: sticky;
      top: 0;
      background: var(--surface);
      z-index: 101;
    }
   
    .sidebar-logo {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      overflow: hidden;
      flex-shrink: 0;
    }
   
    .sidebar-logo svg {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
   
    .sidebar-title {
      font-size: 1.5rem;
      font-weight: 700;
      color: var(--primary-color);
    }
   
    .sidebar-nav {
      padding: 1rem 0;
    }
   
    .nav-section {
      margin-bottom: 2rem;
    }
   
    .nav-section-title {
      font-size: 0.75rem;
      font-weight: 600;
      color: var(--text-secondary);
      text-transform: uppercase;
      letter-spacing: 0.05em;
      padding: 0 1.5rem;
      margin-bottom: 0.75rem;
    }
   
    .nav-item {
      display: flex;
      align-items: center;
      gap: 0.75rem;
      padding: 0.75rem 1.5rem;
      color: var(--text-secondary);
      cursor: pointer;
      transition: all 0.2s;
      text-decoration: none;
      border-left: 3px solid transparent;
    }
   
    .nav-item:hover {
      background: var(--surface-secondary);
      color: var(--text-primary);
    }
   
    .nav-item.active {
      background: rgb(26 181 244 / 0.1);
      color: var(--primary-color);
      border-left-color: var(--primary-color);
    }
   
    .nav-icon {
      font-size: 1.25rem;
      width: 20px;
      text-align: center;
    }
   
    .sidebar-footer {
      margin-top: 2rem;
      padding: 1.5rem;
      border-top: 1px solid var(--border-color);
      background: var(--surface);
      position: sticky;
      bottom: 0;
      z-index: 101;
    }
   
    .user-info {
      display: flex;
      align-items: center;
      gap: 0.75rem;
      margin-bottom: 1rem;
    }
   
    .user-avatar {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: var(--primary-color);
      color: var(--surface);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 600;
      overflow: hidden;
    }
    
    .user-avatar img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
   
    .user-details h4 {
      font-size: 0.875rem;
      font-weight: 600;
      color: var(--text-primary);
    }
   
    .user-details p {
      font-size: 0.75rem;
      color: var(--text-secondary);
    }
   
    /* Main Content Area */
    .main-content {
      margin-left: var(--sidebar-width);
      min-height: 100vh;
      display: flex;
      flex-direction: column;
      width: calc(100% - var(--sidebar-width));
      transition: margin-left 0.3s ease, width 0.3s ease;
    }

    .main-content.collapsed {
      margin-left: 0;
      width: 100%;
    }
   
    .topbar {
      height: var(--topbar-height);
      background: var(--surface);
      border-bottom: 1px solid var(--border-color);
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 2rem;
      box-shadow: var(--shadow);
      position: sticky;
      top: 0;
      z-index: 50;
    }
   
    .hamburger-menu {
      display: none;
      font-size: 1.5rem;
      cursor: pointer;
      padding: 0.5rem;
      color: var(--text-primary);
    }

    .sidebar-toggle {
      display: block;
      font-size: 1.5rem;
      cursor: pointer;
      padding: 0.5rem;
      color: var(--text-primary);
    }
   
    .topbar-left {
      display: flex;
      align-items: center;
      gap: 1rem;
    }
   
    .page-title {
      font-size: 1.5rem;
      font-weight: 600;
      color: var(--text-primary);
    }
   
    .class-selector {
      min-width: 200px;
      padding: 0.5rem 1rem;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      background: var(--surface);
    }
   
    .topbar-right {
      display: flex;
      align-items: center;
      gap: 1rem;
    }
    .notification-bell { position: relative; width: 42px; height: 42px; padding: 0.5rem; }
    .notification-bell img { display: block; width: 24px; height: 24px; object-fit: contain; }
    .notification-dot { position: absolute; top: 5px; right: 5px; width: 10px; height: 10px; border-radius: 50%; background: var(--danger-color); border: 2px solid var(--surface); }
   
    .search-input {
      padding: 0.5rem 1rem;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      min-width: 250px;
      background: var(--surface);
    }
   
    .content-area {
      flex: 1;
      padding: 2rem;
      overflow-y: auto;
    }
   
    .content-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 2rem;
      flex-wrap: wrap;
      gap: 1rem;
    }
   
    .view-toggle {
      display: flex;
      background: var(--surface-secondary);
      border-radius: 8px;
      padding: 0.25rem;
    }
   
    .view-option {
      padding: 0.5rem 1rem;
      background: transparent;
      border: none;
      border-radius: 6px;
      cursor: pointer;
      font-weight: 500;
      color: var(--text-secondary);
      transition: all 0.2s;
    }
   
    .view-option.active {
      background: var(--surface);
      color: var(--text-primary);
      box-shadow: var(--shadow);
    }
   
    .action-buttons {
      display: flex;
      gap: 0.75rem;
      flex-wrap: wrap;
    }

    .grid-columns-selector {
      display: flex;
      align-items: center;
      gap: 0.5rem;
    }

    .list-view-controls {
      display: flex;
      align-items: center;
      gap: 0.5rem;
    }

    .list-view-controls .btn {
      padding: 0.25rem 0.75rem;
    }

    #listSizeDisplay {
      font-weight: 500;
      min-width: 120px;
      text-align: center;
      color: var(--text-secondary);
      font-size: 0.875rem;
    }

    /* Admin Styles */
    .admin-header {
      background: var(--surface);
      border-radius: 16px;
      padding: 2rem;
      margin-bottom: 2rem;
      box-shadow: var(--shadow);
      border: 1px solid var(--border-color);
    }
   
    .admin-title {
      font-size: 2rem;
      font-weight: 700;
      color: var(--text-primary);
      margin-bottom: 1rem;
      display: flex;
      align-items: center;
      gap: 0.75rem;
    }
   
    .admin-controls {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
      margin-top: 1.5rem;
    }
   
    .admin-content {
      background: var(--surface);
      border-radius: 16px;
      padding: 2rem;
      box-shadow: var(--shadow);
      border: 1px solid var(--border-color);
    }

    .admin-stats {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
      gap: 1rem;
      margin-bottom: 2rem;
    }

    .stat-card {
      background: var(--surface-secondary);
      padding: 1.5rem;
      border-radius: 12px;
      text-align: center;
    }

    .stat-value {
      font-size: 2rem;
      font-weight: 700;
      color: var(--primary-color);
      margin-bottom: 0.5rem;
    }

    .stat-label {
      color: var(--text-secondary);
      font-size: 0.875rem;
      font-weight: 500;
    }

    /* Student Cards */
    .students-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
      gap: 1.5rem;
    }

    .students-list {
      display: none;
    }

    .students-compact {
      display: none;
      grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
      gap: 1rem;
    }

    #studentListTable {
      width: 100%;
      border-collapse: collapse;
    }
    #studentListTable th {
      background-color: var(--surface-secondary);
      font-weight: 600;
      color: var(--text-primary);
    }
    #studentListTable td, #studentListTable th {
      padding: 1rem;
      vertical-align: middle;
      text-align: left;
      border-bottom: 1px solid var(--border-color);
    }
    #studentListTable tbody tr {
      cursor: pointer;
      transition: background-color 0.2s;
    }
    #studentListTable tbody tr:hover {
      background-color: var(--surface-secondary);
    }
    #studentListTable tbody tr.selected {
      border-left: 3px solid var(--primary-color);
      background: rgb(26 181 244 / 0.05);
    }
    .student-list-avatar-cell {
      display: flex;
      align-items: center;
      gap: 1rem;
    }
    .student-list-avatar {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: var(--primary-color);
      color: var(--surface);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 600;
      overflow: hidden;
      flex-shrink: 0;
    }
    .student-list-avatar img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .student-list-name {
      font-weight: 600;
      color: var(--text-primary);
    }
    #studentListTable .student-list-points,
    #studentListTable .student-list-rewards {
      text-align: center;
      font-weight: 500;
    }
    .student-list-actions {
      display: flex;
      gap: 0.5rem;
      justify-content: center;
    }

    /* List View Sizing Styles */
    #studentListTable td, #studentListTable th, 
    #studentListTable .student-list-avatar, #studentListTable .student-list-actions .btn {
        transition: all 0.2s ease-in-out;
    }

    /* Size Level -2 (Smallest) */
    #studentListTable[data-size-level="-2"] td, #studentListTable[data-size-level="-2"] th {
        padding: 0.25rem 0.5rem;
        font-size: 0.75rem;
    }
    #studentListTable[data-size-level="-2"] .student-list-avatar {
        width: 24px;
        height: 24px;
    }
    #studentListTable[data-size-level="-2"] .student-list-actions .btn {
        padding: 0.2rem 0.4rem;
        font-size: 0.65rem;
    }

    /* Size Level -1 (Small) */
    #studentListTable[data-size-level="-1"] td, #studentListTable[data-size-level="-1"] th {
        padding: 0.5rem;
        font-size: 0.875rem;
    }
    #studentListTable[data-size-level="-1"] .student-list-avatar {
        width: 32px;
        height: 32px;
    }
    #studentListTable[data-size-level="-1"] .student-list-actions .btn {
        padding: 0.35rem;
    }

    /* Size Level 1 (Large) */
    #studentListTable[data-size-level="1"] td, #studentListTable[data-size-level="1"] th {
        padding: 1.25rem;
        font-size: 1.1rem;
    }
    #studentListTable[data-size-level="1"] .student-list-avatar {
        width: 48px;
        height: 48px;
    }
    #studentListTable[data-size-level="1"] .student-list-actions .btn {
        padding: 0.6rem;
        font-size: 0.9rem;
    }

    /* Size Level 2 (Largest) */
    #studentListTable[data-size-level="2"] td, #studentListTable[data-size-level="2"] th {
        padding: 1.5rem;
        font-size: 1.2rem;
    }
    #studentListTable[data-size-level="2"] .student-list-avatar {
        width: 56px;
        height: 56px;
    }
    #studentListTable[data-size-level="2"] .student-list-actions .btn {
        padding: 0.7rem 1rem;
        font-size: 1rem;
    }
   
    .student-card {
      background: var(--surface);
      border: 1px solid var(--border-color);
      border-radius: 12px;
      padding: 1.5rem;
      text-align: center;
      transition: all 0.2s;
      cursor: pointer;
      position: relative;
    }
   
    .student-card:hover {
      transform: translateY(-2px);
      box-shadow: var(--shadow-lg);
    }

    .student-card.selected {
      border-color: var(--primary-color);
      background: rgb(26 181 244 / 0.05);
    }
   
    .student-avatar {
      width: 64px;
      height: 64px;
      border-radius: 50%;
      background: var(--primary-color);
      color: var(--surface);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.5rem;
      font-weight: 600;
      margin: 0 auto 1rem;
      position: relative;
      overflow: hidden;
    }

    .student-avatar img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
   
    .student-name {
      font-size: 1.125rem;
      font-weight: 600;
      color: var(--text-primary);
      margin-bottom: 0.5rem;
    }
   
    .student-points {
      color: var(--primary-color);
      font-weight: 600;
      margin-bottom: 1rem;
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 0.5rem;
    }

    .power-up-badge {
      background: var(--warning-color); 
      color: var(--surface); 
      padding: 0.25rem 0.5rem; 
      border-radius: 12px; 
      font-size: 0.75rem;
      font-weight: bold;
    }

    .student-rewards {
      font-size: 0.875rem;
      color: var(--success-color);
      font-weight: 500;
    }

    .student-actions {
      position: absolute;
      top: 0.5rem;
      right: 0.5rem;
      display: none;
      gap: 0.5rem;
    }

    .student-card:hover .student-actions {
      display: flex;
    }
   
    .add-student-card {
      background: var(--surface-secondary);
      border: 2px dashed var(--border-color);
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      min-height: 180px;
      cursor: pointer;
      transition: all 0.2s;
    }
   
    .add-student-card:hover {
      border-color: var(--primary-color);
      background: rgb(26 181 244 / 0.05);
    }
   
    .add-student-icon {
      font-size: 2rem;
      color: var(--text-secondary);
      margin-bottom: 0.5rem;
    }

    /* Compact View Styles */
    .compact-student-item {
      background: var(--surface);
      border: 1px solid var(--border-color);
      border-radius: 8px;
      padding: 0.75rem;
      display: flex;
      align-items: center;
      gap: 0.75rem;
      cursor: pointer;
      transition: all 0.2s;
    }

    .compact-student-item:hover {
      box-shadow: var(--shadow);
    }

    .compact-student-item.selected {
      border-color: var(--primary-color);
      background: rgb(26 181 244 / 0.05);
    }

    .compact-avatar {
      width: 32px;
      height: 32px;
      border-radius: 50%;
      background: var(--primary-color);
      color: var(--surface);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 600;
      overflow: hidden;
      flex-shrink: 0;
    }

    .compact-avatar img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }

    .compact-info {
      flex: 1;
      min-width: 0;
    }

    .compact-name {
      font-weight: 500;
      color: var(--text-primary);
      white-space: nowrap;
      overflow: hidden;
      text-overflow: ellipsis;
    }

    .compact-points {
      font-weight: 600;
      color: var(--primary-color);
      white-space: nowrap;
      display: flex;
      align-items: center;
      gap: 0.5rem;
    }

    /* Reason Chip Styles */
    .reason-chip {
      display: flex;
      align-items: center;
      gap: 0.5rem;
      background: rgb(26 181 244 / 0.1);
      color: var(--primary-color);
      padding: 0.25rem 0.75rem;
      border-radius: 20px;
      font-size: 0.875rem;
      border: 1px solid rgb(26 181 244 / 0.2);
    }

    .reason-chip button {
      background: transparent;
      border: none;
      color: var(--primary-color);
      cursor: pointer;
      font-size: 1rem;
    }
    
    .saved-reasons-container {
      display: flex;
      flex-wrap: wrap;
      gap: 0.5rem;
      margin-top: 0.5rem;
      max-height: 100px;
      overflow-y: auto;
    }

    .reason-select-chip {
      background: var(--surface-secondary);
      color: var(--text-primary);
      padding: 0.5rem 1rem;
      border-radius: 20px;
      font-size: 0.875rem;
      border: 1px solid var(--border-color);
      cursor: pointer;
      transition: all 0.2s;
    }

    .reason-select-chip:hover {
      background: var(--primary-color);
      color: var(--surface);
      border-color: var(--primary-dark);
    }

    /* Class Detail View */
    .class-detail-card {
      background: var(--surface);
      border: 1px solid var(--border-color);
      border-radius: 12px;
      padding: 2rem;
      margin-bottom: 2rem;
      transition: all 0.2s;
    }

    .class-detail-header {
      display: flex;
      justify-content: space-between;
      align-items: start;
      margin-bottom: 1.5rem;
    }

    .class-detail-title {
      font-size: 1.5rem;
      font-weight: 600;
      color: var(--text-primary);
      margin-bottom: 0.5rem;
    }

    .class-detail-teacher {
      color: var(--text-secondary);
      margin-bottom: 1rem;
    }

    .class-stats {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
      gap: 1rem;
      margin-bottom: 1.5rem;
    }

    .class-stat {
      text-align: center;
      padding: 1rem;
      background: var(--surface-secondary);
      border-radius: 8px;
    }

    .class-stat-value {
      font-size: 1.5rem;
      font-weight: 700;
      color: var(--primary-color);
      margin-bottom: 0.25rem;
    }

    .class-stat-label {
      color: var(--text-secondary);
      font-size: 0.875rem;
    }

    .students-table {
      width: 100%;
      border-collapse: collapse;
      margin-top: 1rem;
    }

    .students-table th,
    .students-table td {
      padding: 0.75rem;
      text-align: left;
      border-bottom: 1px solid var(--border-color);
    }

    .students-table th {
      font-weight: 600;
      color: var(--text-primary);
      background: var(--surface-secondary);
    }

    .students-table tbody tr:hover {
      background: var(--surface-secondary);
    }

    /* Rewards Section */
    .rewards-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
      gap: 1.5rem;
    }

    .reward-card {
      background: var(--surface);
      border: 1px solid var(--border-color);
      border-radius: 12px;
      padding: 1.5rem;
      transition: all 0.2s;
      position: relative;
    }

    .reward-card:hover {
      box-shadow: var(--shadow-lg);
    }

    .reward-card.instant-reward {
      border-left: 4px solid var(--info-color);
    }

    .reward-card.deduct-reward {
      border-left: 4px solid var(--danger-color);
    }

    .reward-card.require-reward {
      border-left: 4px solid var(--success-color);
    }

    .reward-type-badge {
      position: absolute;
      top: 1rem;
      right: 1rem;
      padding: 0.25rem 0.5rem;
      border-radius: 12px;
      font-size: 0.75rem;
      font-weight: 600;
      text-transform: uppercase;
    }

    .instant-badge {
      background: rgb(14 165 233 / 0.1);
      color: var(--info-color);
    }

    .deduct-badge {
      background: rgb(220 38 38 / 0.1);
      color: var(--danger-color);
    }

    .require-badge {
      background: rgb(5 150 105 / 0.1);
      color: var(--success-color);
    }

    .reward-header {
      display: flex;
      justify-content: space-between;
      align-items: start;
      margin-bottom: 1rem;
    }

    .reward-title {
      font-size: 1.125rem;
      font-weight: 600;
      color: var(--text-primary);
      margin-bottom: 0.25rem;
    }

    .reward-points {
      background: var(--primary-color);
      color: var(--surface);
      padding: 0.25rem 0.75rem;
      border-radius: 20px;
      font-size: 0.875rem;
      font-weight: 600;
    }

    .reward-image { width: 48px; height: 48px; object-fit: contain; vertical-align: middle; margin-right: 0.5rem; }
    .reward-description {
      color: var(--text-secondary);
      margin-bottom: 1rem;
    }

    .reward-actions {
      display: flex;
      gap: 0.5rem;
      flex-wrap: wrap;
    }

    /* Leaderboard */
    .podium-container {
      display: flex;
      justify-content: center;
      align-items: flex-end;
      gap: 1rem;
      margin-bottom: 2rem;
      height: 250px;
      padding: 0 1rem;
    }

    .podium-step {
      width: 30%;
      max-width: 200px;
      position: relative;
      text-align: center;
      background: var(--surface);
      border-radius: 12px 12px 0 0;
      padding: 2.5rem 0.75rem 0.5rem;
      box-shadow: 0 4px 6px rgba(0,0,0,0.1);
      border: 1px solid var(--border-color);
      border-bottom: none;
      transition: transform 0.2s ease;
    }
    .podium-step:hover {
      transform: translateY(-5px);
    }

    .podium-2 { height: 80%; border-top: 8px solid #C0C0C0; }
    .podium-1 { height: 100%; border-top: 8px solid #FFD700; }
    .podium-3 { height: 75%; border-top: 8px solid #CD7F32; }
    
    .podium-rank {
      position: absolute;
      top: 0.25rem;
      left: 50%;
      transform: translateX(-50%);
      font-size: 2rem;
      font-weight: 900;
      line-height: 1;
      text-shadow: 2px 2px 4px rgba(0,0,0,0.1);
      z-index: 1;
    }
    .podium-2 .podium-rank { color: #A9A9A9; }
    .podium-1 .podium-rank { color: #FDB813; }
    .podium-3 .podium-rank { color: #B87333; }

    .podium-avatar {
      width: 64px;
      height: 64px;
      border-radius: 50%;
      margin: 0.5rem auto;
      border: 4px solid var(--surface);
      box-shadow: 0 2px 4px rgba(0,0,0,0.1);
      background-color: var(--primary-color);
      overflow: hidden;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 2rem;
      font-weight: bold;
      color: white;
    }
    .podium-avatar img { width: 100%; height: 100%; object-fit: cover; }
    .podium-name { font-weight: 600; margin-bottom: 0.25rem; color: var(--text-primary); word-break: break-word; }
    .podium-points { font-weight: bold; color: var(--primary-dark); font-size: 1.1rem; word-break: break-word; }
    
    .leaderboard-list { margin-top: 1rem; }
    .leaderboard-item {
      display: flex;
      align-items: center;
      gap: 1rem;
      padding: 1rem;
      background: var(--surface);
      border: 1px solid var(--border-color);
      border-radius: 12px;
      margin-bottom: 0.75rem;
    }
   
    .leaderboard-rank {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      color: var(--surface);
      font-size: 0.875rem;
      background: var(--primary-color);
    }
   
    .leaderboard-avatar {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: var(--primary-color);
      color: var(--surface);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 600;
      overflow: hidden;
    }

    .leaderboard-avatar img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
   
    .leaderboard-name {
      flex: 1;
      font-weight: 600;
      color: var(--text-primary);
    }
   
    .leaderboard-points {
      font-weight: 700;
      color: var(--primary-color);
    }
    
    /* History Calendar View */
    .calendar-container {
        background: var(--surface);
        border: 1px solid var(--border-color);
        border-radius: 12px;
        padding: 1.5rem;
    }
    .calendar-header {
        display: flex;
        justify-content: space-between;
        align-items: center;
        margin-bottom: 1rem;
    }
    .calendar-header h3 {
        margin: 0;
        font-size: 1.25rem;
    }
    .calendar-grid {
        display: grid;
        grid-template-columns: repeat(7, 1fr);
        gap: 0.5rem;
    }
    .calendar-day-header {
        text-align: center;
        font-weight: 600;
        color: var(--text-secondary);
        font-size: 0.875rem;
        padding-bottom: 0.5rem;
    }
    .calendar-day {
        border: 1px solid var(--border-color);
        border-radius: 8px;
        min-height: 80px;
        padding: 0.5rem;
        font-weight: 500;
        transition: background-color 0.2s;
    }
    .calendar-day.other-month {
        color: var(--text-secondary);
        background-color: var(--surface-secondary);
    }
    .calendar-day.has-history {
        cursor: pointer;
        background-color: rgb(26 181 244 / 0.1);
        border-color: rgb(26 181 244 / 0.2);
    }
    .calendar-day.positive-day { background: rgb(5 150 105 / 0.18); border-color: rgb(5 150 105 / 0.35); }
    .calendar-day.negative-day { background: rgb(220 38 38 / 0.16); border-color: rgb(220 38 38 / 0.35); }
    .calendar-day.mixed-day { background: linear-gradient(90deg, rgb(5 150 105 / 0.2) 0 50%, rgb(220 38 38 / 0.18) 50% 100%); border-color: #94a3b8; }
    .calendar-day.has-history:hover {
        background-color: rgb(26 181 244 / 0.2);
    }
    .calendar-day-history-popup {
        position: absolute;
        background: var(--surface);
        box-shadow: var(--shadow-lg);
        border-radius: 8px;
        padding: 1rem;
        z-index: 1001;
        width: min(300px, calc(100vw - 24px));
        max-width: calc(100vw - 24px);
        border: 1px solid var(--border-color);
    }
      .history-entry { display: flex; justify-content: space-between; gap: 1rem; padding: 0.5rem; border-bottom: 1px solid var(--border-color); overflow-wrap: anywhere; }
      .history-filters { display: flex; gap: 0.75rem; align-items: center; flex-wrap: wrap; }
      .history-filters select, .history-filters input { min-width: 150px; max-width: 220px; }
      .analytics-chart { display: flex; align-items: end; gap: 4px; height: 220px; padding: 1rem 0 2rem; border-bottom: 1px solid var(--border-color); overflow-x: auto; }
      .analytics-bar-column { flex: 1 0 22px; min-width: 22px; height: 100%; display: flex; flex-direction: column; justify-content: end; align-items: center; position: relative; }
      .analytics-bar { width: min(100%, 34px); min-height: 3px; border-radius: 4px 4px 0 0; background: var(--success-color); }
      .analytics-bar-label { position: absolute; bottom: -1.75rem; font-size: 0.65rem; color: var(--text-secondary); white-space: nowrap; }
      .analytics-reasons { display: grid; gap: 0.75rem; margin-top: 1.5rem; }
      .analytics-reason { display: grid; grid-template-columns: minmax(100px, 1fr) 3fr auto; gap: 0.75rem; align-items: center; }
      .analytics-reason-track { height: 10px; background: var(--surface-secondary); border-radius: 6px; overflow: hidden; }
      .analytics-reason-fill { height: 100%; background: var(--primary-color); }
      @media (max-width: 640px) {
        .history-filters { width: 100%; }
        .history-filters select, .history-filters input { min-width: 0; width: 100%; max-width: none; }
        .calendar-container { padding: 0.75rem; }
        .calendar-grid { gap: 0.2rem; }
        .calendar-day { min-height: 54px; padding: 0.25rem; font-size: 0.8rem; }
        .calendar-day-header { font-size: 0.7rem; }
        .history-entry { flex-direction: column; gap: 0.2rem; }
        .content-header { flex-wrap: wrap; }
        .analytics-reason { grid-template-columns: minmax(76px, 1fr) 2fr auto; gap: 0.4rem; font-size: 0.8rem; }
        .podium-container { gap: 0.35rem; padding: 0 0.25rem; height: 210px; }
        .podium-step { width: 33%; padding: 2.25rem 0.4rem 0.5rem; }
        .podium-rank { top: 0.2rem; font-size: 1.75rem; }
        .podium-avatar { width: 56px; height: 56px; }
        .podium-name { font-size: 0.8rem; }
        .podium-points { font-size: 0.9rem; }
        #demoViewSwitcher { flex-wrap: wrap; }
        .sidebar.compact .sidebar-title, .sidebar.compact .nav-section-title, .sidebar.compact .nav-label, .sidebar.compact .user-details { display: block; }
        .sidebar.compact .nav-item { justify-content: flex-start; padding: 0.75rem 1.5rem; }
        .sidebar.compact .nav-icon { width: 20px; }
      }
      @media (max-width: 1024px) {
        .sidebar-resizer { display: none; }
        .sidebar.compact .sidebar-title, .sidebar.compact .nav-section-title, .sidebar.compact .nav-label, .sidebar.compact .user-details { display: block; }
        .sidebar.compact .nav-item { justify-content: flex-start; padding: 0.75rem 1.5rem; }
        .sidebar.compact .nav-icon { width: 20px; }
      }

    /* Bulk Actions */
    .bulk-actions {
      display: none;
      background: rgb(26 181 244 / 0.1);
      border: 1px solid rgb(26 181 244 / 0.2);
      border-radius: 12px;
      padding: 1rem;
      margin-bottom: 1.5rem;
      align-items: center;
      gap: 1rem;
      flex-wrap: wrap;
    }
   
    .bulk-actions.active {
      display: flex;
    }
   
    .selected-count {
      font-weight: 600;
      color: var(--primary-color);
    }
   
    .bulk-point-input {
      width: 80px;
      padding: 0.5rem;
      border: 1px solid var(--border-color);
      border-radius: 6px;
      text-align: center;
    }

    /* Modals */
    .modal {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: rgba(0, 0, 0, 0.5);
      z-index: 1000;
      padding: 1rem;
    }
   
    .modal.active {
      display: flex;
      align-items: center;
      justify-content: center;
    }
   
    .modal-content {
      background: var(--surface);
      border-radius: 16px;
      padding: 2rem;
      max-width: 500px;
      width: 100%;
      max-height: 90vh;
      overflow-y: auto;
      box-shadow: var(--shadow-lg);
    }

    .modal-content.large {
      max-width: 800px;
    }
   
    .modal-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 1.5rem;
    }
   
    .modal-title {
      font-size: 1.5rem;
      font-weight: 600;
      color: var(--text-primary);
    }
   
    .modal-close {
      background: none;
      border: none;
      font-size: 1.5rem;
      cursor: pointer;
      color: var(--text-secondary);
      padding: 0.25rem;
    }
   
    .modal-footer {
      display: flex;
      gap: 0.75rem;
      justify-content: flex-end;
      margin-top: 1.5rem;
    }
    
    .modal-tabs {
        display: flex;
        border-bottom: 1px solid var(--border-color);
        margin-bottom: 1.5rem;
    }
    .modal-tab {
        padding: 0.75rem 1.5rem;
        cursor: pointer;
        border-bottom: 3px solid transparent;
        margin-bottom: -1px;
        font-weight: 500;
        color: var(--text-secondary);
    }
    .modal-tab.active {
        color: var(--primary-color);
        border-bottom-color: var(--primary-color);
    }
    .modal-tab-content {
        display: none;
    }
    .modal-tab-content.active {
        display: block;
    }

    /* File upload styles */
    .file-upload {
      display: none;
    }

    .upload-area {
      border: 2px dashed var(--border-color);
      border-radius: 8px;
      padding: 2rem;
      text-align: center;
      cursor: pointer;
      transition: all 0.2s;
      margin-bottom: 1rem;
    }

    .upload-area:hover {
      border-color: var(--primary-color);
      background: rgb(26 181 244 / 0.05);
    }

    .upload-area.dragover {
      border-color: var(--primary-color);
      background: rgb(26 181 244 / 0.1);
    }

    /* Reward Type Toggle */
    .reward-type-toggle {
      display: flex;
      background: var(--surface-secondary);
      border-radius: 8px;
      padding: 0.25rem;
      margin-bottom: 1.5rem;
    }

    .reward-type-option {
      flex: 1;
      padding: 0.75rem;
      background: transparent;
      border: none;
      border-radius: 6px;
      cursor: pointer;
      font-weight: 500;
      color: var(--text-secondary);
      transition: all 0.2s;
      text-align: center;
    }

    .reward-type-option.active {
      background: var(--surface);
      color: var(--text-primary);
      box-shadow: var(--shadow);
    }

    /* Notification Styles */
    .notification {
      position: fixed;
      top: 2rem;
      right: 2rem;
      background: var(--surface);
      border: 1px solid var(--border-color);
      border-radius: 12px;
      padding: 1rem 1.5rem;
      box-shadow: var(--shadow-lg);
      z-index: 9999;
      transform: translateX(calc(100% + 2rem));
      transition: transform 0.4s ease-in-out;
      max-width: 400px;
    }

    .notification.show {
      transform: translateX(0);
    }

    .notification.success {
      border-left: 4px solid var(--success-color);
    }

    .notification.info {
      border-left: 4px solid var(--info-color);
    }

    .notification.warning {
      border-left: 4px solid var(--warning-color);
    }

    .notification.error {
      border-left: 4px solid var(--danger-color);
    }

    /* Fullscreen Embed Styles */
    .embed-container {
      position: relative;
      background: var(--surface);
      border-radius: 12px;
      border: 1px solid var(--border-color);
      margin-bottom: 2rem;
      overflow: hidden;
      box-shadow: var(--shadow);
    }

    .embed-container.fullscreen {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      z-index: 2000;
      background: var(--surface);
      border-radius: 0;
      margin: 0;
    }

    .embed-container iframe {
      width: 100%;
      height: 400px;
      border: none;
      border-radius: 12px;
    }

    .embed-container.fullscreen iframe {
      height: 100%;
      border-radius: 0;
    }

    .embed-controls {
      position: absolute;
      top: 0.5rem;
      right: 0.5rem;
      display: flex;
      gap: 0.5rem;
      z-index: 2001;
    }

    .embed-button {
      background: var(--surface);
      border: 1px solid var(--border-color);
      border-radius: 4px;
      padding: 0.25rem 0.5rem;
      cursor: pointer;
      font-size: 0.75rem;
      color: var(--text-primary);
      transition: all 0.2s;
    }

    .embed-button:hover {
      background: var(--surface-secondary);
    }

    .embed-header {
      padding: 1rem;
      border-bottom: 1px solid var(--border-color);
      background: var(--surface-secondary);
    }

    .embed-header .btn {
      padding: 0.5rem 1rem;
      font-size: 0.875rem;
    }

    .embed-header-content {
        flex-grow: 1;
    }

    .embed-title {
      font-weight: 600;
      color: var(--text-primary);
      margin: 0;
    }

    .embed-url {
      color: var(--text-secondary);
      font-size: 0.875rem;
      margin-top: 0.25rem;
    }
    
    /* Selectable Student Grid for Modals */
    .selectable-student-grid {
        display: grid;
        grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
        gap: 1rem;
        max-height: 400px;
        overflow-y: auto;
    }
    .selectable-student-card {
        padding: 1rem;
        border: 2px solid var(--border-color);
        border-radius: 8px;
        text-align: center;
        cursor: pointer;
        transition: all 0.2s;
    }
    .selectable-student-card.selected {
        border-color: var(--primary-color);
        background-color: rgb(26 181 244 / 0.1);
    }
    .selectable-student-card .student-avatar {
        width: 48px;
        height: 48px;
        font-size: 1rem;
        margin-bottom: 0.5rem;
    }
    .selectable-student-card .student-name {
        font-size: 0.875rem;
        font-weight: 500;
    }

    /* Emoji Picker Styles */
    #emojiGrid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(40px, 1fr));
      gap: 0.5rem;
      max-height: 300px;
      overflow-y: auto;
      padding-top: 1rem;
    }

    .emoji-item {
      font-size: 1.5rem;
      cursor: pointer;
      text-align: center;
      padding: 0.25rem;
      border-radius: 4px;
      transition: background-color 0.2s;
    }

    .emoji-item:hover {
      background-color: var(--surface-secondary);
    }

    .sidebar-overlay {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: rgba(30, 41, 59, 0.5);
      z-index: 99;
      opacity: 0;
      visibility: hidden;
      transition: opacity 0.3s ease, visibility 0s 0.3s linear;
    }
    .sidebar-overlay.active {
      opacity: 1;
      visibility: visible;
      transition: opacity 0.3s ease;
    }

    /* Extras Grid */
    .extras-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
      gap: 1.5rem;
    }

    .tool-card {
      background: var(--surface);
      border: 1px solid var(--border-color);
      border-radius: 12px;
      padding: 1.5rem;
      text-align: center;
      transition: all 0.2s;
      cursor: pointer;
      text-decoration: none;
      color: var(--text-primary);
    }

    .tool-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-lg);
    }

    .tool-card-logo {
      width: 64px;
      height: 64px;
      border-radius: 8px;
      margin: 0 auto 1rem;
      object-fit: contain;
      background: var(--surface-secondary);
      padding: 0.5rem;
    }

    .tool-card-title {
      font-weight: 600;
    }

    #extrasEmbedView {
        display: none;
    }
    
    /* Student & Parent Portal */
    .portal-layout {
        display: none;
        flex-direction: column;
        min-height: 100vh;
    }
    .portal-layout.active {
        display: flex;
    }
    .portal-header {
        height: var(--topbar-height);
        background: var(--surface);
        border-bottom: 1px solid var(--border-color);
        display: flex;
        align-items: center;
        justify-content: space-between;
        padding: 0 2rem;
        box-shadow: var(--shadow);
    }
    .portal-info {
        display: flex;
        align-items: center;
        gap: 1.5rem;
    }
    .portal-name {
        font-size: 1.25rem;
        font-weight: 600;
    }
    .portal-points {
        font-size: 1.25rem;
        font-weight: 700;
        color: var(--primary-color);
    }
    .portal-main {
        flex: 1;
        padding: 2rem;
    }
    .portal-main .content-area {
        padding: 0;
    }
    
    /* Toggle Switch */
    .switch {
      position: relative;
      display: inline-block;
      width: 50px;
      height: 28px;
    }
    .switch input { 
      opacity: 0;
      width: 0;
      height: 0;
    }
    .slider {
      position: absolute;
      cursor: pointer;
      top: 0;
      left: 0;
      right: 0;
      bottom: 0;
      background-color: #ccc;
      transition: .4s;
      border-radius: 28px;
    }
    .slider:before {
      position: absolute;
      content: "";
      height: 20px;
      width: 20px;
      left: 4px;
      bottom: 4px;
      background-color: white;
      transition: .4s;
      border-radius: 50%;
    }
    input:checked + .slider {
      background-color: var(--primary-color);
    }
    input:checked + .slider:before {
      transform: translateX(22px);
    }

    /* Tablet and Mobile Responsiveness */
    @media (max-width: 1024px) {
      .hamburger-menu {
        display: block;
      }
      .sidebar-toggle {
        display: none;
      }
      .sidebar {
        transform: translateX(-100%);
        width: 320px;
      }
     
      .sidebar.mobile-open {
        transform: translateX(0);
      }
     
      .main-content, .portal-main {
        margin-left: 0;
        width: 100%;
      }
     
      .topbar, .portal-header {
        padding: 0 1rem;
      }
     
      .content-area, .portal-main {
        padding: 1rem;
      }
     
      .students-grid {
        grid-template-columns: 1fr;
      }
     
      .search-input {
        min-width: auto;
        width: 100%;
      }
     
      .content-header {
        flex-direction: column;
        align-items: stretch;
      }
     
      .action-buttons {
        justify-content: center;
      }

      .notification {
        top: 1rem;
        right: 1rem;
        left: 1rem;
        max-width: none;
        transform: translateY(-150%);
      }
      .notification.show {
        transform: translateY(0);
      }

      .admin-stats, .class-stats {
        grid-template-columns: repeat(2, 1fr);
      }

      .corner-button {
        font-size: 0.75rem;
        padding: 0.25rem 0.5rem;
      }

      .embed-container iframe {
        height: 300px;
      }
    }
    
    /* Phone-specific Responsiveness */
    @media (max-width: 768px) {
      .auth-card, .admin-header, .admin-content, .modal-content, .class-detail-card {
        padding: 1.5rem;
      }
      .auth-title, .admin-title, .modal-title {
        font-size: 1.5rem;
      }

      .sidebar {
        width: 100%;
      }

      .topbar {
        flex-wrap: wrap;
        height: auto;
        padding: 0.75rem 1rem;
        gap: 0.75rem;
      }
      .topbar-left {
        flex-grow: 1;
        gap: 0.5rem;
        width: 100%;
        justify-content: space-between;
      }
      .topbar-left .btn-success {
        display: none; /* Hide less critical button on phones */
      }
      .topbar-right {
        width: 100%;
        display: flex;
        flex-wrap: wrap;
        align-items: center;
        gap: 0.5rem;
      }
      .page-title {
        font-size: 1.25rem;
      }
      .search-input, .class-selector {
        width: 100%;
      }
      
      .portal-header {
        height: auto;
        padding: 0.75rem 1rem;
        flex-wrap: wrap;
      }
      .portal-header #demoViewSwitcher { order: 3; width: 100%; }
      .portal-name, .portal-points {
        font-size: 1rem;
      }

      .admin-stats, .class-stats {
        grid-template-columns: 1fr; /* Single column on phones */
      }
      
      /* Responsive Table Styles */
      .responsive-table {
        border: none;
      }
      .responsive-table thead {
        display: none;
      }
      .responsive-table tr {
        display: block;
        margin-bottom: 1rem;
        border: 1px solid var(--border-color);
        border-radius: 8px;
        padding: 1rem;
        background: var(--surface);
      }
      .responsive-table td {
        display: flex;
        justify-content: space-between;
        align-items: center;
        text-align: right;
        border-bottom: 1px solid var(--surface-secondary);
        padding: 0.75rem 0;
      }
      .responsive-table td:last-child {
        border-bottom: none;
      }
      .responsive-table td::before {
        content: attr(data-label);
        font-weight: 600;
        color: var(--text-primary);
        text-align: left;
        margin-right: 1rem;
      }
      .responsive-table td .btn {
        padding: 0.25rem 0.5rem;
        font-size: 0.75rem;
      }
    }

    /* Desktop View */
    @media (min-width: 1025px) {
      .hamburger-menu {
        display: none;
      }
    }

    /* Utility Classes */
    .text-center { text-align: center; }
    .mb-1 { margin-bottom: 0.25rem; }
    .mb-2 { margin-bottom: 0.5rem; }
    .mb-3 { margin-bottom: 0.75rem; }
    .mb-4 { margin-bottom: 1rem; }
    .mt-4 { margin-top: 1rem; }
    .hidden { display: none; }
    .relative { position: relative; }