.form-submit-loading-spinner {
    display: block;
    position: absolute;
    inset-inline-start: 0.25em;
    top: 50%;
    width: 1em;
    height: 1em;
    box-sizing: border-box;
    border: 0.14em solid currentColor;
    border-inline-end-color: transparent;
    border-radius: 50%;
    pointer-events: none;
    z-index: 1;
    animation: form-submit-spinner-turn 0.7s linear infinite;
}

@keyframes form-submit-spinner-turn {
    from { transform: translateY(-50%) rotate(0deg); }
    to { transform: translateY(-50%) rotate(360deg); }
}

@media (prefers-reduced-motion: reduce) {
    .form-submit-loading-spinner { animation-duration: 1.5s; }
}