body {
  background: linear-gradient(to right, #0f0f0f, #1a1a1a);
  color: #dcdcdc;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  margin: 0;
}

.contenedor {
  text-align: center;
  background-color: rgba(255, 255, 255, 0.02);
  padding: 2em;
  border-radius: 12px;
  box-shadow: 0 0 20px rgba(100, 100, 255, 0.1);
}

input, button {
  padding: 0.7em;
  margin: 1em 0.3em;
  border-radius: 6px;
  border: none;
  font-size: 1em;
}

input {
  width: 60%;
  max-width: 300px;
}

button {
  background-color: #7a5cff;
  color: white;
  cursor: pointer;
  transition: background 0.3s ease;
}

button:hover {
  background-color: #a18aff;
}

h2.error {
  color: #a85fff;
  margin-top: 1.5em;
}