* {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    body {
      font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
      background-color: #f4f6f8;
      min-height: 100vh;
      color: #333;
      line-height: 1.6;
      padding: 2rem;
    }

    .container {
      max-width: 900px;
      margin: 0 auto;
    }

    .flashcard {
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(10px);
      border-radius: 20px;
      padding: 3rem 2rem;
      box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
      border: 1px solid rgba(255, 255, 255, 0.2);
      margin-bottom: 2rem;
    }

    .card-header {
      text-align: center;
      margin-bottom: 2rem;
      padding-bottom: 1.5rem;
      border-bottom: 2px solid rgba(0, 102, 204, 0.1);
    }

    .card-title {
      font-size: 2rem;
      font-weight: 700;
      background: linear-gradient(45deg, #0066cc, #004a99);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      margin-bottom: 0.5rem;
    }

    .card-subtitle {
      color: #666;
      font-size: 1.1rem;
      font-style: italic;
    }

    .section {
      margin-bottom: 2rem;
      background: rgba(255, 255, 255, 0.5);
      border-radius: 15px;
      padding: 1.5rem;
      border: 1px solid rgba(0, 0, 0, 0.05);
      transition: all 0.3s ease;
    }

    .section:hover {
      transform: translateY(-2px);
      box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
      border-color: rgba(0, 102, 204, 0.2);
    }

    .section-label {
      font-size: 1.2rem;
      font-weight: 700;
      color: #0066cc;
      margin-bottom: 1rem;
      display: flex;
      align-items: center;
      gap: 0.5rem;
    }

    .section-label::before {
      content: '';
      width: 4px;
      height: 20px;
      background: linear-gradient(45deg, #0066cc, #004a99);
      border-radius: 2px;
    }

    .section-content {
      font-size: 1.1rem;
      color: #555;
      line-height: 1.7;
    }

    .section-content p {
      margin-bottom: 1rem;
    }

    .section-content p:last-child {
      margin-bottom: 0;
    }

    .import-button {
      display: block;
      width: 100%;
      max-width: 300px;
      margin: 2rem auto 0;
      padding: 1rem 2rem;
      font-size: 1.1rem;
      font-weight: 600;
      background: linear-gradient(45deg, #0066cc, #004a99);
      color: white;
      border: none;
      border-radius: 50px;
      cursor: pointer;
      transition: all 0.3s ease;
      box-shadow: 0 5px 15px rgba(0, 102, 204, 0.4);
      text-align: center;
    }

    .import-button:hover {
      transform: translateY(-2px);
      box-shadow: 0 8px 25px rgba(0, 102, 204, 0.6);
    }

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

    .import-button:disabled {
      opacity: 0.6;
      cursor: not-allowed;
      transform: none !important;
    }

    /* Loading state */
    .loading-spinner {
      display: inline-block;
      width: 20px;
      height: 20px;
      border: 2px solid rgba(255, 255, 255, 0.3);
      border-radius: 50%;
      border-top-color: #fff;
      animation: spin 1s ease-in-out infinite;
      margin-right: 0.5rem;
    }

    @keyframes spin {
      to { transform: rotate(360deg); }
    }

    /* Alert/notification styling */
    .notification {
      position: fixed;
      top: 2rem;
      right: 2rem;
      background: rgba(76, 175, 80, 0.95);
      color: white;
      padding: 1rem 1.5rem;
      border-radius: 10px;
      box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
      backdrop-filter: blur(10px);
      z-index: 1000;
      transform: translateX(100%);
      transition: transform 0.3s ease;
    }

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

    .notification.error {
      background: rgba(244, 67, 54, 0.95);
    }

    /* Responsive design */
    @media (max-width: 768px) {
      body {
        padding: 1rem;
      }

      .flashcard {
        padding: 2rem 1rem;
      }

      .card-title {
        font-size: 1.5rem;
      }

      .section {
        padding: 1rem;
      }

      .section-label {
        font-size: 1.1rem;
      }

      .section-content {
        font-size: 1rem;
      }

      .import-button {
        font-size: 1rem;
        padding: 0.8rem 1.5rem;
        max-width: 250px;
      }

      .notification {
        right: 1rem;
        left: 1rem;
        top: 1rem;
      }
    }

    /* MathJax styling improvements */
    .MathJax {
      font-size: 1.1em !important;
    }

    /* Code blocks if any */
    code {
      background: rgba(0, 102, 204, 0.1);
      padding: 0.2rem 0.4rem;
      border-radius: 4px;
      font-family: 'Monaco', 'Menlo', monospace;
      font-size: 0.9em;
    }

    pre {
      background: rgba(0, 102, 204, 0.05);
      padding: 1rem;
      border-radius: 8px;
      overflow-x: auto;
      margin: 1rem 0;
      border-left: 4px solid #0066cc;
    }