body {
      background: linear-gradient(135deg, #213877, #C7D744);
      min-height: 100vh;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .card {
      border: none;
      border-radius: 1rem;
      box-shadow: 0 0 20px rgba(0,0,0,0.25);
    }
    h3 {
      color: #213877;
      font-weight: bold;
    }
    .form-label {
      color: #213877;
      font-weight: 500;
    }
    .form-control:focus {
      box-shadow: 0 0 5px #C7D744;
      border-color: #C7D744;
    }
    .btn-primary {
      background: #213877;
      border: none;
      font-weight: bold;
    }
    .btn-primary:hover {
      background: #C7D744;
      color: #213877;
    }
    .text-muted {
      color: #555 !important;
    }

    /*IMAGEN DEL LOGUEO*/
 .imagenindex {
  max-width: 120px;      /* tamaño controlado */
  height: auto;
}

.tituloindex {
  font-size: 1.8rem;
  font-weight: bold;
  color: #213877;        /* azul corporativo */
  letter-spacing: 2px;   /* espaciado entre letras */
}

.tituloindex::after {
  content: "";
  display: block;
  width: 60px;
  height: 4px;
  background: #C7D744;   /* línea verde debajo */
  margin: 8px auto 0;
  border-radius: 2px;
}