.pwa-install-prompt{
  position:fixed;
  right:18px;
  bottom:18px;
  z-index:9999;
  display:flex;
  align-items:center;
  gap:14px;
  max-width:min(440px,calc(100vw - 28px));
  padding:14px;
  border:1px solid rgba(15,23,42,.12);
  border-radius:10px;
  background:#ffffff;
  box-shadow:0 18px 45px rgba(15,23,42,.18);
  color:#0f172a;
}
.pwa-install-prompt strong,
.pwa-install-prompt span{
  display:block;
}
.pwa-install-prompt span{
  margin-top:2px;
  color:#475569;
  font-size:13px;
}
.pwa-install-actions{
  display:flex;
  align-items:center;
  gap:8px;
  flex-shrink:0;
}
@media (max-width:640px){
  .pwa-install-prompt{
    left:12px;
    right:12px;
    bottom:12px;
    align-items:stretch;
    flex-direction:column;
  }
  .pwa-install-actions{
    justify-content:flex-end;
  }
}