* {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    body, html {
      height: 100%;
      font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
      background-color: #f2f6f9;
      display: flex;
      justify-content: center;
      align-items: center;
      text-align: center;
      padding: 20px;
      color: #333;
    }

    .card {
      background: white;
      padding: 40px;
      border-radius: 12px;
      max-width: 480px;
      width: 100%;
      box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
    }

    .card svg {
      width: 80px;
      height: 80px;
      margin-bottom: 20px;
      fill: #0077cc;
    }

    h1 {
      font-size: 1.8rem;
      margin-bottom: 10px;
      color: #2c3e50;
    }

    p {
      font-size: 1rem;
      color: #555;
      line-height: 1.5;
    }

    .signature {
      margin-top: 25px;
      font-style: italic;
      color: #777;
      font-size: 0.9rem;
    }

    @media (max-width: 500px) {
      .card {
        padding: 30px 20px;
      }

      h1 {
        font-size: 1.5rem;
      }
    }