.iepnb-pdf-viewer {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    max-width: 100%;
    margin: 1.5rem 0;
  }
  
  .iepnb-pdf-viewer iframe {
    width: 100%;
    height: 800px;
    border: 1px solid #d4d4d4;
    border-radius: 4px;
    background-color: #f5f5f5;
  }
  
  .iepnb-pdf-download-form {
    display: flex;
    justify-content: flex-end;
  }
  
  .iepnb-pdf-download-form button {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.6rem 1.25rem;
    font-size: 0.95rem;
    font-weight: 600;
    color: #ffffff;
    background-color: #2e7d32;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.2s ease-in-out;
  }
  
  .iepnb-pdf-download-form button:hover,
  .iepnb-pdf-download-form button:focus {
    background-color: #1b5e20;
  }
  
  .iepnb-pdf-download-form button::before {
    content: "\2193"; /* flecha hacia abajo simple, sin icon library */
    font-weight: bold;
  }
  
  @media (max-width: 768px) {
    .iepnb-pdf-viewer iframe {
      height: 500px;
    }
  
    .iepnb-pdf-download-form {
      justify-content: stretch;
    }
  
    .iepnb-pdf-download-form button {
      width: 100%;
      justify-content: center;
    }
  }