  <style>
    body {
      font-family: "Segoe UI", "Hiragino Sans", sans-serif;
      background-color: #fff;
      color: #333;
      margin: 0;
      padding: 0;
    }
    main.container {
      max-width: 480px;
      margin: 0 auto;
      padding: 60px 20px;
      text-align: center;
    }
    h1 {
      font-size: 1.6rem;
      font-weight: 600;
      margin-bottom: 20px;
      color: #004080;
    }
    p.message {
      font-size: 1rem;
      margin-bottom: 30px;
      line-height: 1.6;
    }
    a.btn {
      display: inline-block;
      background-color: #007bff;
      color: #fff;
      text-decoration: none;
      border-radius: 6px;
      padding: 12px 28px;
      font-weight: 600;
      transition: background-color 0.2s;
    }
    a.btn:hover {
      background-color: #005fcc;
    }
    footer {
      margin-top: 60px;
      font-size: 0.85rem;
      color: #777;
    }
    .logo {
      width: 160px;
      margin-bottom: 24px;
    }
    .spinner { margin:20px auto 30px;
      width:40px;
      height:40px;
      border:4px solid #ccc;
      border-top:4px solid #007bff;
      border-radius:50%;
      animation:spin 1s linear infinite;
     }
    @keyframes spin { 100% { transform:rotate(360deg);} }
  </style>
