body {
      margin: 0;
      font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
      background: #f8f9fa;
      color: #333;
    }
    
    .container {
      max-width: 1000px;
      background: white;
      margin: 30px auto;
      padding: 40px;
      min-height: 70vh;
      border-radius: 8px;
      box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    }
    .section {
      margin-bottom: 40px;
      padding-bottom: 30px;
      border-bottom: 2px solid #e9ecef;
    }
    .section:last-child {
      border-bottom: none;
    }
    h2 {
      color: #2c3e50;
      border-left: 5px solid #3498db;
      padding-left: 15px;
      margin-top: 0;
    }
    h3 {
      color: #34495e;
      margin-top: 25px;
      border-bottom: 2px solid #e9ecef;
      padding-bottom: 8px;
    }
    .topics-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
      gap: 15px;
      margin-top: 20px;
    }
    .topic-item {
      padding: 18px;
      background: #f8f9fa;
      border-radius: 6px;
      border-left: 4px solid #e74c3c;
      transition: transform 0.2s, box-shadow 0.2s;
    }
    .topic-item:hover {
      transform: translateY(-2px);
      box-shadow: 0 4px 8px rgba(0,0,0,0.1);
    }
    a {
      color: #2980b9;
      text-decoration: none;
      font-weight: 500;
    }
    a:hover {
      text-decoration: underline;
    }
    .description {
      color: #666;
      font-size: 14px;
      margin-top: 8px;
      line-height: 1.4;
    }
    .topic-title {
      font-size: 16px;
      font-weight: 600;
      color: #2c3e50;
    }