body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: linear-gradient(135deg, #e3f2fd, #ffffff);
  margin: 0;
  padding: 20px;
}

.container {
  max-width: 500px;
  margin: 40px auto;
  background: white;
  padding: 30px 25px;
  border-radius: 15px;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.1);
  transition: all 0.3s ease-in-out;
}

h1 {
  text-align: center;
  color: #333;
  margin-bottom: 30px;
}

label {
  display: block;
  margin-top: 15px;
  font-weight: 600;
  color: #555;
}

select {
  width: 100%;
  padding: 10px;
  margin-top: 5px;
  border-radius: 8px;
  border: 1px solid #ccc;
  font-size: 16px;
}

button {
  margin-top: 25px;
  width: 100%;
  padding: 12px;
  background-color: #007bff;
  border: none;
  color: white;
  font-size: 17px;
  font-weight: 600;
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.3s ease;
}

button:hover {
  background-color: #0056b3;
}

.resultado {
  opacity: 0;
  margin-top: 25px;
  padding: 15px;
  background-color: #e9f7ef;
  border-left: 5px solid #28a745;
  border-radius: 8px;
  font-style: italic;
  color: #155724;
  transition: opacity 0.5s ease-in-out;
  min-height: 60px;
}

/* Mostrar el copy con animación */
.resultado.visible {
  opacity: 1;
}

/* Responsive */
@media (max-width: 600px) {
  .container {
    margin: 20px 10px;
    padding: 20px;
  }

  h1 {
    font-size: 22px;
  }

  button {
    font-size: 15px;
  }

  select {
    font-size: 15px;
  }
}