.is-hidden { display: none !important; }
.is-invisible { visibility: hidden; }
.is-muted { opacity: 0.45; pointer-events: none; }
.is-busy { opacity: 0.6; pointer-events: none; cursor: progress; }


body[data-cart-state="empty"] .is-when-filled { display: none; }
body[data-cart-state="filled"] .is-when-empty { display: none; }
body[data-cart-state="sent"] .is-when-empty,
body[data-cart-state="sent"] .is-when-filled { display: none; }

.is-flash { animation: flashPulse 0.7s ease; }
@keyframes flashPulse {
  0%   { box-shadow: 0 0 0 0 rgba(255, 90, 20, 0.55); }
  70%  { box-shadow: 0 0 0 14px rgba(255, 90, 20, 0); }
  100% { box-shadow: 0 0 0 0 rgba(255, 90, 20, 0); }
}
@media (prefers-reduced-motion: reduce) { .is-flash { animation: none; } }

.is-added { --btn-bg: #16803c; }