.pwa-install-banner {
  position: fixed;
  z-index: 1000;
  right: 12px;
  bottom: calc(12px + env(safe-area-inset-bottom));
  left: 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--surface-raised);
  color: var(--ink);
  box-shadow: 0 16px 48px #0009;
}
.pwa-install-banner p { margin: 0; font: 600 16px/1.4 system-ui, sans-serif; }
.pwa-install-banner div { display: flex; gap: 8px; }
.pwa-install-banner button {
  min-width: 72px;
  min-height: 44px;
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: transparent;
  color: inherit;
  font: 600 14px system-ui, sans-serif;
  cursor: pointer;
}
.pwa-install-banner .pwa-install-primary {
  border-color: var(--button-bg);
  background: var(--button-bg);
  color: var(--button-ink);
}
.pwa-install-banner .pwa-install-primary:hover {
  border-color: var(--button-hover);
  background: var(--button-hover);
}
.pwa-install-help {
  position: fixed;
  z-index: 1001;
  right: 12px;
  bottom: calc(12px + env(safe-area-inset-bottom));
  left: 12px;
  max-width: 450px;
  margin: auto;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--surface-raised);
  color: var(--ink);
  box-shadow: 0 12px 36px #0008;
  font: 15px/1.5 system-ui, sans-serif;
}
.pwa-install-help p { margin: 0; padding-right: 48px; }
.pwa-install-help-close {
  position: absolute;
  top: 8px;
  right: 8px;
  width: 44px;
  height: 44px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: transparent;
  color: var(--ink);
  font: 24px/1 system-ui, sans-serif;
}
@media (min-width: 768px) { .pwa-install-banner { display: none; } }
@media (max-width: 480px) {
  .pwa-install-banner { align-items: stretch; flex-direction: column; }
  .pwa-install-banner div { justify-content: stretch; }
  .pwa-install-banner button { flex: 1; }
}