.aviso-mantenimiento {
    background-color: #ffc107;
    color: #000;
    text-align: center;
    padding: 12px;
    font-weight: bold;
    font-size: 1.1em;
    box-shadow: 0 2px 4px rgba(0,0,0,0.15);
  }
  
  /* Responsive: pantallas menores a 768px */
  @media screen and (max-width: 768px) {
    .aviso-mantenimiento {
      font-size: 0.95em;
      padding: 10px;
      line-height: 1.4em;
    }
  }