body {
      font-family: 'Segoe UI', sans-serif;
      background: #f3f3f3;
      color: #333;
      padding: 40px;
      max-width: 800px;
      margin: auto;
    }
    header {
      text-align: center;
      border-bottom: 2px solid #ccc;
      margin-bottom: 30px;
    }
    h1 {
      font-size: 2.5em;
      color: #004080;
    }
    h2 {
      color: #0077cc;
    }
    ul {
      background: #e0f7fa;
      padding: 15px;
      border-radius: 8px;
    }
    footer {
      margin-top: 40px;
      font-size: 0.9em;
      text-align: center;
      color: #666;
    }