/* Estilo básico del spinner */
#spinner{
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
}


.spinner {
  width: 40px;
  height: 40px;
  margin: 20px auto;
  border: 4px solid rgba(0,0,0,0.1);
  border-top: 4px solid #3498db;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

body.loading {
  overflow: hidden;
}