body {
  margin: 0;
  font-family: Arial, sans-serif;
  background-color: burlywood;
  color: #1f2937;
}

.contenedor {
  max-width: 900px;
  margin: 60px auto;
  padding: 32px;
  background-color: white;
  border-radius: 16px;
}

h1 { color: red; }

.tarjeta {
  margin-top: 24px;
  padding: 20px;
  background-color: blueviolet;
  border-left: 6px solid violet;
  border-radius: 12px;
}

button {
  padding: 12px 18px;
  border: none;
  border-radius: 8px;
  background-color: #2563eb;
  color: white;
  cursor: pointer;
}

button:hover {
  background-color: #1e40af;
}

#resultado {
  margin-top: 16px;
  font-weight: bold;
}