body {
      font-family: Arial, sans-serif;
      background-color: #f4f6f8;
      margin: 0;
      padding: 24px;
      color: #333;
    }

    h1 {
      text-align: center;
      color: #01579b;
      margin-bottom: 12px;
    }

    .page-description {
      max-width: 700px;
      margin: 0 auto 24px auto; 
      text-align: center; 
      font-size: 16px;
      color: #555;
      padding: 0 10px;
    }

    .lesson-list-container {
      max-width: 1200px;
      margin: 24px auto;
      background: white;
      padding: 24px;
      border-radius: 16px;
      box-shadow: 0 6px 16px rgba(0,0,0,0.1);
    }

    #back-button {
      display: inline-block;
      margin-bottom: 24px;
      background: #0288d1;
      color: white;
      padding: 10px 16px;
      border-radius: 8px;
      text-decoration: none;
      font-weight: bold;
      transition: background 0.2s ease;
    }
    #back-button:hover {
      background: #0277bd;
    }

    .business-category {
      margin-bottom: 20px;
    }

    .business-category h2 {
      font-size: 20px;
      color: #333;
      margin-top: 0;
      margin-bottom: 15px;
      padding-bottom: 10px;
      border-bottom: 1px solid #eee;
    }

    .lesson-item {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 12px 5px;
      border-bottom: 1px solid #f0f0f0;
      transition: background-color 0.2s ease;
    }
    .lesson-item:last-child {
      border-bottom: none;
    }
    .lesson-item:hover {
      background-color: #f9f9f9;
    }

    .lesson-item a {
      text-decoration: none;
      color: #007bff;
      font-size: 16px;
      flex-grow: 1;
    }
    .lesson-item a:hover {
      text-decoration: underline;
    }

    .difficulty-tag {
      padding: 4px 10px;
      border-radius: 12px;
      font-size: 12px;
      color: white;
      margin-left: 10px;
      white-space: nowrap;
    }
    .difficulty-tag.easy { background-color: #28a745; }
    .difficulty-tag.intermediate { background-color: #ffc107; color: #212529; }
    .difficulty-tag.advanced { background-color: #dc3545; }

    .hidden-lesson {
      display: none;
    }

    .show-more-btn {
      background-color: #007bff;
      color: white;
      border: none;
      padding: 8px 16px;
      text-align: center;
      text-decoration: none;
      display: inline-block;
      font-size: 14px;
      margin-top: 10px;
      cursor: pointer;
      border-radius: 5px;
      transition: background-color 0.2s ease;
    }
    .show-more-btn:hover {
      background-color: #0056b3;
    }