@keyframes priceFlashUp {
    0% { color: #16a34a; } /* emerald-600 */
    100% { color: inherit; }
}
@keyframes priceFlashDown {
    0% { color: #dc2626; } /* red-600 */
    100% { color: inherit; }
}
.price-flash-up { animation: priceFlashUp 2000ms ease; }
.price-flash-down { animation: priceFlashDown 2000ms ease; }