body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f4f4f4;
  }
  
  .app {
    max-width: 100%;
    margin: 0 auto;
    padding: 20px;
    background-color: #fff;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
  }
  
  .navbar {
    background-color: #007bff;
    color: #fff;
    padding: 15px;
    text-align: center;
    border-radius: 5px;
    margin-bottom: 20px;
  }
  
  .navbar h1 {
    margin: 0;
    font-size: 1.5rem;
  }
  
  .section {
    margin-bottom: 10px;
    border: 1px solid #ddd;
    border-radius: 5px;
    overflow: hidden;
  }
  
  .section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px;
    background-color: #f9f9f9;
    cursor: pointer;
    transition: background-color 0.3s ease;
  }
  
  .section-header:hover {
    background-color: #e9e9e9;
  }
  
  .section-header h2 {
    margin: 0;
    font-size: 1.2rem;
    color: #007bff;
  }
  
  .section-header .arrow {
    font-size: 1.2rem;
    color: #007bff;
  }
  
  .section-content {
    padding: 15px;
    background-color: #fff;
    border-top: 1px solid #ddd;
    display: none;
  }
  
  ul, ol {
    padding-left: 20px;
  }
  
  ul li, ol li {
    margin-bottom: 10px;
  }
  
  button {
    margin-top: 10px;
    padding: 8px 16px;
    background-color: #007bff;
    color: #fff;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s ease;
  }
  
  button:hover {
    background-color: #0056b3;
  }
  
  @media (max-width: 600px) {
    .navbar h1 {
      font-size: 1.2rem;
    }
  
    .section-header h2 {
      font-size: 1rem;
    }
  }