/* Two gentle rings; the button itself stays still. */
@keyframes install-hint-ring{
  0%,100%{box-shadow:0 0 0 0 rgb(244 123 101 / 0)}
  25%{box-shadow:0 0 0 5px rgb(244 123 101 / .48)}
  80%{box-shadow:0 0 0 14px rgb(244 123 101 / 0)}
}
.install-hint{animation:install-hint-ring 1.6s ease-out 2}
@media(prefers-reduced-motion:reduce),(max-width:680px){.install-hint{animation:none}}