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

    body {
      font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
      background: linear-gradient(135deg, #ffffff 0%, #dffeea 100%);
      min-height: 100vh;
      color: #333;
      display: flex;
      flex-direction: column;
    }

    main {
      flex-grow: 1;
      display: flex;
      align-items: center;
      justify-content: center;
      padding: 2rem;
    }

    .card {
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(10px);
      border-radius: 20px;
      padding: 2.5rem;
      box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
      max-width: 600px;
      width: 100%;
      text-align: center;
    }

    .card h2 {
      color: #4a5568;
      font-size: 1.6rem;
      margin-bottom: 1rem;
    }

    .card p {
      font-size: 1rem;
      color: #4a5568;
    }

    .user-info {
      margin: 1.5rem 0;
      font-size: 1.1rem;
      color: #4a5568;
    }

    .btn {
      background: linear-gradient(45deg, #7484de, #6c4397);
      color: white;
      padding: 0.75rem 1.5rem;
      border: none;
      border-radius: 25px;
      cursor: pointer;
      font-weight: 500;
      text-decoration: none;
      display: inline-block;
      transition: transform 0.2s ease, box-shadow 0.2s ease;
    }

    .btn:hover {
      transform: translateY(-2px);
      box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
    }

    .app-footer {
      margin-top: auto;
    }