body {
      font-family: 'Segoe UI', sans-serif;
      background: #f2f4f8;
      display: flex;
      flex-direction: column;
      align-items: center;
      padding: 2rem;
    }
    .card {
      background: white;
      padding: 2rem;
      border-radius: 12px;
      box-shadow: 0 4px 8px rgba(0,0,0,0.1);
      width: 400px;
    }
    input {
      width: 100%;
      padding: 0.7rem;
      font-size: 1rem;
      margin-bottom: 1rem;
    }
    button {
      padding: 0.6rem 1rem;
      font-size: 1rem;
      background: #4f46e5;
      color: white;
      border: none;
      border-radius: 6px;
      cursor: pointer;
    }
    button:hover {
      background: #3730a3;
    }
    .resultado {
      margin-top: 1rem;
      background: #eef;
      padding: 1rem;
      border-radius: 8px;
    }