/* click feedback: never leave a button silent -- pending the instant it's clicked, then flash the real result */
.btn-pending{ opacity:.7; cursor:wait; animation:btn-pulse 1s ease-in-out infinite; }
@media (prefers-reduced-motion: reduce){ .btn-pending{ animation:none; } }
@keyframes btn-pulse{ 0%,100%{ opacity:.7; } 50%{ opacity:.4; } }
.btn-flash-on, .preset-on{ background:#16A34A !important; color:#FFFFFF !important; }
.btn-flash-off, .preset-off{ background:#DC2626 !important; color:#FFFFFF !important; }