#pantalla-carga {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: #ffffff;
  z-index: 99999;
  display: flex;
  justify-content: center;
  align-items: center;
  transition: opacity 0.5s ease, visibility 0.5s ease;
}

.spinner {
  border: 4px solid rgba(0, 0, 0, 0.1);
  width: 50px;
  height: 50px;
  border-radius: 50%;
  border-left-color: #333;
  animation: girar 1s linear infinite;
}

@keyframes girar {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

body.cargado #pantalla-carga {
  opacity: 0;
  visibility: hidden;
}