body {
  margin: 0;
  padding: 0;
  height: 100vh;
  background-size: cover;
  background-position: center;
  animation: cambioFondo 18s infinite;
  position: relative;
  z-index: 1;
}

@keyframes cambioFondo {
  0% {
    background-image: url("../img/fondologin.902a1e44065f.png");
  }
  33% {
    background-image: url("../img/fondologin1.0d0adc4ec18b.png");
  }
  66% {
    background-image: url("../img/fondologin2.1ced72b89671.png");
  }
  100% {
    background-image: url("../img/fondologin.902a1e44065f.png");
  }
}

/* Capa oscura superpuesta */
body::before {
  content: '';
  position: fixed;
  top: 0; left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.4); /* Opacidad ajustable */
  z-index: 2;
}

/* Todo el contenido encima del fondo */
.container {
  position: relative;
  z-index: 3;
}

.login-card {
  background-color: rgba(255, 255, 255, 0.95);
  border: 2px solid #0056b3;
}

.login-btn {
  background-color: #0056b3;
  color: white;
}

.login-btn:hover {
  background-color: #003d80;
}

.logo-img {
  max-width: 90px;
  margin-bottom: 15px;
}

.slogan {
  font-size: 14px;
  color: #444;
  font-style: italic;
}