body {
  font-family: Arial, sans-serif;
  background: #f5f5f5;
  text-align: center;
  padding: 40px;
  color: #333;
}

h1 {
  color: #2c3e50;
  margin-bottom: 20px;
}

form {
  margin-bottom: 20px;
}

input[type="text"] {
  padding: 10px;
  width: 200px;
  border: 2px solid #2c3e50;
  border-radius: 6px;
  outline: none;
}

input[type="text"]:focus {
  border-color: #3498db;
}

input[type="submit"] {
  padding: 10px 20px;
  border: none;
  background: #3498db;
  color: white;
  border-radius: 6px;
  cursor: pointer;
  margin-left: 10px;
}

input[type="submit"]:hover {
  background: #2980b9;
}

#resultado {
  margin-top: 20px;
  font-weight: bold;
  color: #27ae60;
}