body {
  font-family: Arial, sans-serif;
  background-color: #222222; /* Gris oscuro */
  color: #CCCCCC; /* Gris claro */
  margin: 0;
  padding: 0;
}

.container {
  max-width: 800px;
  margin: 0 auto;
  padding: 20px;
  background-color: #333333; /* Gris medio */
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.3);
}

h1, h2 {
  text-align: center;
  color: #FFFFFF; /* Blanco */
}

.form-group {
  margin-bottom: 20px;
}

label {
  display: block;
  font-weight: bold;
  margin-bottom: 5px;
  color: #CCCCCC; /* Gris claro */
}

input[type="text"],
input[type="number"] {
  width: 100%;
  padding: 10px;
  border: 1px solid #555555; /* Gris medio */
  border-radius: 4px;
  box-sizing: border-box;
  background-color: #444444; /* Gris oscuro */
  color: #CCCCCC; /* Gris claro */
}

.options {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  grid-gap: 10px;
}

.options label {
  display: flex;
  align-items: center;
  background-color: #444444; /* Gris oscuro */
  padding: 10px;
  border-radius: 4px;
  cursor: pointer;
}

.options input[type="radio"] {
  margin-right: 5px;
}

button[type="submit"] {
  display: block;
  width: 100%;
  padding: 10px;
  background-color: #666666; /* Gris */
  color: #FFFFFF; /* Blanco */
  border: none;
  border-radius: 4px;
  cursor: pointer;
}

button[type="submit"]:hover {
  background-color: #555555; /* Gris medio */
}

#output {
  margin-top: 20px;
  padding: 10px;
  background-color: #444444; /* Gris oscuro */
  border-radius: 4px;
  color: #CCCCCC; /* Gris claro */
}

@media (max-width: 480px) {
  .container {
    padding: 10px;
  }

  h1 {
    font-size: 24px;
  }

  h2 {
    font-size: 18px;
  }

  .options {
    grid-template-columns: 1fr;
  }
}