.pwa-install-banner {
  position: fixed;
  z-index: 4000;
  left: max(12px, env(safe-area-inset-left));
  right: max(12px, env(safe-area-inset-right));
  bottom: max(12px, env(safe-area-inset-bottom));
  width: min(560px, calc(100vw - 24px));
  margin-inline: auto;
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr) auto;
  gap: 12px;
  align-items: center;
  padding: 14px;
  border: 1px solid rgba(237, 112, 20, .3);
  border-radius: 18px;
  background: rgba(255, 250, 239, .98);
  color: #2f241a;
  box-shadow: 0 18px 48px rgba(57, 35, 16, .24);
  font-family: "Manrope", "Noto Sans TC", sans-serif;
  transform: translateY(calc(100% + 32px));
  opacity: 0;
  transition: transform .24s ease, opacity .24s ease;
}

.pwa-install-banner.is-visible { transform: translateY(0); opacity: 1; }
.pwa-install-icon { width: 52px; height: 52px; border-radius: 13px; background: #fff0cf; }
.pwa-install-copy { min-width: 0; }
.pwa-install-title { margin: 0 0 3px; color: #8c430b; font-size: 1rem; font-weight: 800; }
.pwa-install-text { margin: 0; color: #604b38; font-size: .88rem; line-height: 1.45; }
.pwa-install-actions { display: flex; flex-direction: column; gap: 7px; }
.pwa-install-action,
.pwa-install-dismiss {
  min-height: 38px;
  padding: 7px 12px;
  border-radius: 999px;
  font-weight: 800;
  white-space: nowrap;
}
.pwa-install-action { border: 0; background: #ed7014; color: white; }
.pwa-install-dismiss { border: 1px solid rgba(117, 83, 58, .25); background: transparent; color: #604b38; }

@media (max-width: 520px) {
  .pwa-install-banner { grid-template-columns: 44px minmax(0, 1fr); padding: 12px; }
  .pwa-install-icon { width: 44px; height: 44px; }
  .pwa-install-actions { grid-column: 1 / -1; flex-direction: row; }
  .pwa-install-action, .pwa-install-dismiss { flex: 1; }
}

@media (prefers-reduced-motion: reduce) {
  .pwa-install-banner { transition: none; }
}