* { margin: 0; padding: 0; box-sizing: border-box; }
    body {
      background: #f5f5f5;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
      color: #333;
      line-height: 1.7;
    }
    main {
      max-width: 750px;
      margin: 0 auto;
      background: #fff;
      padding: 30px 22px 50px;
    }
    h1 {
      font-size: 32px;
      margin: 20px 0 20px;
      font-weight: 800;
      color: #111;
      text-align: center;
    }
    h2 {
      font-size: 20px;
      margin: 28px 0 12px;
      font-weight: 700;
      color: #1a1a1a;
    }
    p, li {
      font-size: 15px;
      margin-bottom: 12px;
    }
    ul { margin-left: 20px; }
    a {
      color: #4caf50;
      text-decoration: none;
    }
    a:hover { text-decoration: underline; }
    .back-link {
      display: inline-block;
      margin-bottom: 20px;
      font-size: 14px;
      color: #4caf50;
    }
    @media (max-width: 768px) {
      main { padding: 25px 18px 40px; }
      h1 { font-size: 28px; }
    }