button.is-submitting { display: inline-flex; align-items: center; justify-content: center; gap: 8px; }
button.is-submitting:disabled, input.is-submitting:disabled { cursor: wait; opacity: .8; }
.submit-spinner { display: inline-block; width: 16px; height: 16px; flex: 0 0 16px; border: 2px solid currentColor; border-right-color: transparent; border-radius: 50%; animation: submit-spin .7s linear infinite; }
@keyframes submit-spin { to { transform: rotate(360deg); } }
@media (prefers-reduced-motion: reduce) { .submit-spinner { animation: none; } }