/* Spinner estilo circular */
.spinner {
  border: 3px solid rgba(13, 104, 163, 0.2); /* azul fuerte */
  border-top: 3px solid #0D68A3;           /* azul claro */
  border-radius: 50%;
  width: 18px;
  height: 18px;
  animation: spin 0.8s linear infinite;
  display: inline-block;
  box-sizing: border-box;
}

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