/* tiny spinner (16×16) ------------------------------------------- */
.btn-spinner {
  width: 16px;
  height: 16px;
  border: 2px solid transparent;
  border-top-color: #fff;          /* white stroke (change if needed) */
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
  margin-right: 0.5rem;            /* gap between spinner & text */
}

@keyframes spin {
  to { transform: rotate(360deg); }
}