/* Reset and base styles scoped to parent */
    .kids-common-worksheet-app * {
      box-sizing: border-box;
    }

    .kids-common-worksheet-app {
      border-radius:10px;
      margin: 0;
      padding: 50px 10px;
      font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
      line-height: 1.6;
      color: #212529;
      background-color: #f8f9fa;
      min-height: 100vh;
      font-size: 16px;
      
      /* CSS Variables */
      --primary-color: #62a1e6;
      --primary-hover: #3b7dc4;
      --success-color: #198754;
      --success-hover: #146c43;
      --warning-color: #ffc107;
      --warning-hover: #e0a800;
      --danger-color: #dc3545;
      --white: #ffffff;
      --light-gray: #f8f9fa;
      --border-color: #dee2e6;
      --text-primary: #212529;
      --text-secondary: #6c757d;
      --shadow: 0 6px 16px rgba(0, 0, 0, 0.1);
      
      transition: background-color 0.5s ease, color 0.5s ease;
    }

    /* Main Container */
    .kids-common-worksheet-app .container-worksheet {
      max-width: 1150px;
      margin: 0 auto;
      padding: 1rem;
      display: flex;
      gap: 1.5rem;
      min-height: 100vh;
    }

    /* Sidebar */
    .kids-common-worksheet-app .sidebar {
      flex: 0 0 350px;
      display: flex;
      flex-direction: column;
      gap: 1rem;
    }

    .kids-common-worksheet-app .theme-option .label {
    color: black;
}

    .kids-common-worksheet-app .sidebar-content {
      background: var(--white);
      border-radius: 20px;
      padding: 1.5rem;
      box-shadow: var(--shadow);
      position: sticky;
      top: 1rem;
      z-index: 10;
      max-height: calc(100vh - 2rem);
      overflow-y: auto;
    }

    .kids-common-worksheet-app .sidebar-content::-webkit-scrollbar {
      width: 6px;
    }

    .kids-common-worksheet-app .sidebar-content::-webkit-scrollbar-track {
      background: transparent;
    }

    .kids-common-worksheet-app .sidebar-content::-webkit-scrollbar-thumb {
      background: var(--primary-color);
      border-radius: 3px;
    }

    /* Toggle Button */
    .kids-common-worksheet-app .toggle-button {
      width: 100%;
      padding: 1rem;
      background: linear-gradient(135deg, #ffd700, #ffb347);
      color: var(--text-primary);
      border: none;
      border-radius: 12px;
      font-weight: 700;
      cursor: pointer;
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
      font-size: 1rem;
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 0.5rem;
      position: sticky;
      top: 1rem;
      z-index: 11;
      box-shadow: 0 4px 15px rgba(255, 215, 0, 0.2);
    }

    .kids-common-worksheet-app .toggle-button:hover {
      background: linear-gradient(135deg, #ffb347, #ffd700);
      transform: translateY(-2px);
      box-shadow: 0 8px 25px rgba(255, 215, 0, 0.4);
    }

    .kids-common-worksheet-app .toggle-button:active {
      transform: translateY(0);
    }

    /* Collapsible Content */
    .kids-common-worksheet-app .collapsible-content {
      overflow: hidden;
      transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
      opacity: 0;
      transform: translateY(-20px);
      max-height: 0;
    }

    .kids-common-worksheet-app .collapsible-content.show {
      opacity: 1;
      transform: translateY(0);
      max-height: 2000px;
      padding: 1rem 2px;
    }

    /* Panel Styles */
    .kids-common-worksheet-app .panel-title {
      font-size: 1.25rem;
      font-weight: 700;
      margin-bottom: 1.5rem;
      color: var(--text-primary);
      display: flex;
      align-items: center;
      gap: 0.5rem;
    }

    /* Form Elements */
    .kids-common-worksheet-app .form-group {
      margin-bottom: 1.5rem;
    }

    .kids-common-worksheet-app .form-label {
      display: block;
      font-weight: 600;
      margin-bottom: 0.5rem;
      color: var(--text-primary);
    }

    .kids-common-worksheet-app .form-input {
      width: 100%;
      padding: 0.75rem;
      border: 2px solid var(--border-color);
      border-radius: 8px;
      font-size: 1rem;
      transition: all 0.3s ease;
      background: var(--white);
    }

    .kids-common-worksheet-app .form-input:focus {
      outline: none;
      border-color: var(--primary-color);
      box-shadow: 0 0 0 3px rgba(98, 161, 230, 0.1);
    }

    .kids-common-worksheet-app .input-group {
      display: flex;
      gap: 0.5rem;
      align-items: stretch;
    }

    .kids-common-worksheet-app .input-group .form-input {
      flex: 1;
    }

    /* Button Styles */
    .kids-common-worksheet-app .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 0.5rem;
      padding: 0.75rem 1.25rem;
      border: none;
      border-radius: 8px;
      font-size: 1rem;
      font-weight: 600;
      cursor: pointer;
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
      text-decoration: none;
      min-height: 44px;
      white-space: nowrap;
    }

    .kids-common-worksheet-app .btn:hover {
      transform: translateY(-2px);
    }

    .kids-common-worksheet-app .btn:active {
      transform: translateY(0);
    }

    .kids-common-worksheet-app .btn-primary {
      background: var(--primary-color);
      color: var(--white);
    }

    .kids-common-worksheet-app .btn-primary:hover {
      background: var(--primary-hover);
    }

    .kids-common-worksheet-app .btn-success {
      background: var(--success-color);
      color: var(--white);
    }

    .kids-common-worksheet-app .btn-success:hover {
      background: var(--success-hover);
    }

    .kids-common-worksheet-app .btn-warning {
      background: var(--warning-color);
      color: var(--text-primary);
    }

    .kids-common-worksheet-app .btn-warning:hover {
      background: var(--warning-hover);
    }

    .kids-common-worksheet-app .btn-outline {
      background: transparent;
      color: var(--primary-color);
      border: 2px solid var(--primary-color);
    }

    .kids-common-worksheet-app .btn-outline:hover {
      background: var(--primary-color);
      color: var(--white);
    }

    .kids-common-worksheet-app .btn-sm {
      padding: 0.5rem 1rem;
      font-size: 0.875rem;
      min-height: 36px;
    }

    .kids-common-worksheet-app .button-group {
      display: flex;
      gap: 0.75rem;
      margin-bottom: 1.5rem;
    }

    .kids-common-worksheet-app .button-group .btn {
      flex: 1;
    }

    /* Theme Options */
    .kids-common-worksheet-app .theme-options {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(80px, 1fr));
      gap: 0.75rem;
    }

    .kids-common-worksheet-app .theme-option {
      padding: 1rem 0.5rem;
      border: 3px solid transparent;
      border-radius: 12px;
      background: var(--light-gray);
      text-align: center;
      cursor: pointer;
      transition: all 0.3s ease;
      user-select: none;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 0.5rem;
    }

    .kids-common-worksheet-app .theme-option:hover {
      transform: scale(1.05);
      background: #e9ecef;
    }

    .kids-common-worksheet-app .theme-option.selected {
      border-color: var(--primary-color);
      background: var(--primary-color);
      color: var(--white);
      box-shadow: 0 0 15px rgba(98, 161, 230, 0.4);
    }

    .kids-common-worksheet-app .theme-option .icon {
      font-size: 1.5rem;
    }

    .kids-common-worksheet-app .theme-option .label {
      font-size: 0.875rem;
      font-weight: 600;
    }

    /* Main Content */
    .kids-common-worksheet-app .main-content {
      flex: 1;
      min-width: 0;
    }

    .kids-common-worksheet-app .worksheet {
      overflow-y: auto;
      height: 97vh;
      background: var(--white);
      border-radius: 20px;
      padding: 2rem;
      box-shadow: var(--shadow);
      min-height: calc(98vh - 2rem);
      scrollbar-width: none;
    }

    .kids-common-worksheet-app .worksheet-header {
      text-align: center;
      margin-bottom: 2rem;
    }


    .kids-common-worksheet-app .worksheet-title {
      font-size: 2rem;
      font-weight: 700;
      margin: 0;
      color: var(--text-primary);
    }

    /* Question Cards */
    .kids-common-worksheet-app .questions-container {
      display: flex;
      flex-direction: column;
      gap: 1.5rem;
    }

    .kids-common-worksheet-app .question-card {
      border: 3px dashed #ccc;
      border-radius: 15px;
      background: var(--white);
      padding: 1.5rem;
      text-align: center;
      position: relative;
      transition: all 0.3s ease;
    }

    .kids-common-worksheet-app .question-card:hover {
      border-color: var(--primary-color);
      transform: translateY(-2px);
      box-shadow: 0 8px 25px rgba(0, 0, 0, 0.1);
    }

    .kids-common-worksheet-app .question-text {
      font-weight: 700;
      font-size: 1.2rem;
      margin-bottom: 1rem;
      color: #d6336c;
      user-select: none;
      line-height: 1.5;
    }

    .kids-common-worksheet-app .answer {
      font-weight: 700;
      font-size: 1.1rem;
      color: var(--success-color);
      margin: 1rem 0;
      padding: 0.75rem;
      background: rgba(25, 135, 84, 0.1);
      border-radius: 8px;
      border-left: 4px solid var(--success-color);
      opacity: 0;
      transform: translateY(10px);
      transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
      max-height: 0;
      overflow: hidden;
    }
    .kids-common-worksheet-app .logo-img {
      max-width: 170px;
      display: block;
      margin: 0 auto 10px;
    }

    .kids-common-worksheet-app .answer.show {
      opacity: 1;
      transform: translateY(0);
      max-height: 200px;
      margin: 1rem 0;
    }

    /* Theme Variations */
    .kids-common-worksheet-app.theme-rainbow {
      background: linear-gradient(135deg, #ff9a9e 0%, #fecfef 50%, #fecfef 100%);
    }

    .kids-common-worksheet-app.theme-forest {
      background: linear-gradient(135deg, #a8edea 0%, #fed6e3 100%);
    }

    .kids-common-worksheet-app.theme-space {
      background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
      color: var(--white);
    }

    .kids-common-worksheet-app.theme-space .worksheet,
    .kids-common-worksheet-app.theme-space .sidebar-content {
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(10px);
    }

    /* Responsive Design */
    @media (max-width: 1024px) {
      .kids-common-worksheet-app .container-worksheet {
        flex-direction: column;
        gap: 1rem;
      }
      
      .kids-common-worksheet-app .sidebar {
        flex: none;
        order: -1;
      }
      
      .kids-common-worksheet-app .sidebar-content {
        position: static;
        max-height: none;
      }
      
      .kids-common-worksheet-app .toggle-button {
        position: static;
      }
    }

    @media (max-width: 768px) {
      .kids-common-worksheet-app {
        font-size: 14px;
      }
      
      .kids-common-worksheet-app .container-worksheet {
        padding: 0.5rem;
      }
      
      .kids-common-worksheet-app .worksheet {
        padding: 1.5rem;
      }
      
      .kids-common-worksheet-app .sidebar-content {
        padding: 1rem;
      }
      
      .kids-common-worksheet-app .worksheet-title {
        font-size: 1.75rem;
      }
      
      .kids-common-worksheet-app .question-text {
        font-size: 1rem;
      }
      
      .kids-common-worksheet-app .button-group {
        flex-direction: column;
      }
      
      .kids-common-worksheet-app .theme-options {
        grid-template-columns: 1fr;
      }
    }

    @media (max-width: 480px) {
      .kids-common-worksheet-app .input-group {
        flex-direction: column;
      }
      
      .kids-common-worksheet-app .logo {
        font-size: 3rem;
      }
      
      .kids-common-worksheet-app .worksheet-title {
        font-size: 1.5rem;
      }
      
      .kids-common-worksheet-app .question-card {
        padding: 1rem;
      }
    }

    /* Accessibility Improvements */
    @media (prefers-reduced-motion: reduce) {
      .kids-common-worksheet-app * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
      }
    }

    /* Focus Management */
    .kids-common-worksheet-app .btn:focus,
    .kids-common-worksheet-app .form-input:focus,
    .kids-common-worksheet-app .theme-option:focus,
    .kids-common-worksheet-app .toggle-button:focus {
      outline: 1px solid var(--primary-color);
      outline-offset: 1px;
    }

    /* Print Styles */
    @media print {
      .kids-common-worksheet-app .sidebar {
        display: none;
      }
      
      .kids-common-worksheet-app .main-content {
        width: 100%;
        max-width: none;
      }
      
      .kids-common-worksheet-app .worksheet {
        box-shadow: none;
        padding: 0;
      }
      
      .kids-common-worksheet-app .answer {
        opacity: 1 !important;
        transform: none !important;
        max-height: none !important;
        overflow: visible !important;
      }
      
      .kids-common-worksheet-app .btn {
        display: none !important;
      }
    }