.pwa-install-button {
  position: fixed;
  right: max(14px, env(safe-area-inset-right));
  bottom: max(16px, calc(env(safe-area-inset-bottom) + 12px));
  z-index: 45;
  min-height: 46px;
  border: 0;
  border-radius: 999px;
  padding: 11px 17px;
  color: #fff;
  background: #174f86;
  box-shadow: 0 10px 28px rgba(18, 59, 103, .28);
  font: 800 .9rem/1.2 "Sarabun", "Noto Sans Thai", system-ui, sans-serif;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}
.pwa-install-button:active { transform: scale(.97); }
.pwa-install-button[hidden] { display: none !important; }
.pwa-install-button svg { width: 19px; height: 19px; flex: 0 0 auto; }

.pwa-install-overlay {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: grid;
  place-items: center;
  padding: 18px;
  background: rgba(17, 35, 55, .56);
}
.pwa-install-overlay[hidden] { display: none !important; }
.pwa-install-dialog {
  width: min(390px, 100%);
  border-radius: 22px;
  background: #fff;
  color: #263443;
  box-shadow: 0 22px 60px rgba(0, 0, 0, .28);
  padding: 20px;
  font-family: "Sarabun", "Noto Sans Thai", system-ui, sans-serif;
}
.pwa-install-dialog h2 {
  margin: 0;
  color: #174f86;
  font-size: 1.14rem;
  line-height: 1.4;
}
.pwa-install-dialog p {
  margin: 9px 0 0;
  color: #65778a;
  font-size: .87rem;
  line-height: 1.55;
}
.pwa-install-steps {
  margin: 15px 0 0;
  padding: 0;
  list-style: none;
  counter-reset: pwa-step;
  display: grid;
  gap: 10px;
}
.pwa-install-steps li {
  counter-increment: pwa-step;
  display: grid;
  grid-template-columns: 31px minmax(0, 1fr);
  align-items: center;
  gap: 10px;
  color: #334b63;
  font-weight: 750;
  line-height: 1.45;
}
.pwa-install-steps li::before {
  content: counter(pwa-step);
  width: 31px;
  height: 31px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  color: #fff;
  background: #174f86;
  font-size: .82rem;
  font-weight: 900;
}
.pwa-install-close {
  width: 100%;
  min-height: 44px;
  margin-top: 17px;
  border: 0;
  border-radius: 13px;
  color: #fff;
  background: #174f86;
  font: 800 .9rem/1.2 "Sarabun", "Noto Sans Thai", system-ui, sans-serif;
  cursor: pointer;
}
@media (max-width: 520px) {
  .pwa-install-button { right: 12px; bottom: max(12px, calc(env(safe-area-inset-bottom) + 8px)); }
}
@media print {
  .pwa-install-button, .pwa-install-overlay { display: none !important; }
}