/* Submit loading spinner — 300ms delay so fast submissions show nothing.
   Turbo disables the button during submission, triggering :disabled. */
.btn-primary:disabled,
.btn-danger:disabled {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none'%3E%3Ccircle cx='12' cy='12' r='10' stroke='white' stroke-width='3' opacity='0.3'/%3E%3Cpath d='M12 2a10 10 0 0 1 10 10' stroke='white' stroke-width='3' stroke-linecap='round'%3E%3CanimateTransform attributeName='transform' type='rotate' from='0 12 12' to='360 12 12' dur='0.75s' repeatCount='indefinite'/%3E%3C/path%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: left 0.75rem center;
  background-size: 0 0;
  animation: show-spinner 0.15s 300ms both;
}

@keyframes show-spinner {
  to {
    opacity: 0.75;
    padding-left: 2.25rem;
    background-size: 1rem 1rem;
  }
}