/* ── Button Loading States — Sprint 15 ── */

.btn-loading {
    position: relative;
    cursor: not-allowed;
    opacity: 0.8;
}

.btn-loading .btn-spinner {
    animation: btnSpin 0.8s linear infinite;
}

@keyframes btnSpin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.btn-spinner {
    flex-shrink: 0;
    vertical-align: middle;
}

@media (prefers-reduced-motion: reduce) {
    .btn-loading .btn-spinner {
        animation-duration: 2s;
    }
}