.btn-regresar {
    display: inline-block;
    padding: 5px 20px;
    background-color: #1e73be;        /* Azul base */
    color: #fff;
    font-size: 16px;
    font-weight: 600;
    text-decoration: none;
    border-radius: 8px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.15);
    transition: all 0.3s ease;
  }
  .btn-regresar:hover {
    background-color: #155d94;        /* Azul más oscuro al pasar el mouse */
    box-shadow: 0 6px 14px rgba(0,0,0,0.25);
    transform: translateY(-2px);
  }