.quantity-feedback {
  position: fixed;
  left: 50%;
  bottom: calc(20px + env(safe-area-inset-bottom, 0px));
  transform: translate(-50%, 18px);
  width: min(520px, calc(100vw - 32px));
  opacity: 0;
  pointer-events: none;
  transition:
    opacity 0.2s ease,
    transform 0.2s ease;
  z-index: 1200;
}

.quantity-feedback.is-visible {
  opacity: 1;
  transform: translate(-50%, 0);
}

.quantity-feedback__bubble {
  border-radius: 12px;
  background: rgba(22, 27, 29, 0.96);
  color: #ffffff;
  padding: 12px 16px;
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.24);
  font-size: 14px;
  line-height: 1.45;
  text-align: center;
}

@media (max-width: 640px) {
  .quantity-feedback {
    bottom: calc(16px + env(safe-area-inset-bottom, 0px));
    width: calc(100vw - 24px);
  }

  .quantity-feedback__bubble {
    padding: 11px 14px;
    font-size: 13px;
  }
}