.pwa-install-button {
  position: fixed;
  right: max(18px, env(safe-area-inset-right));
  bottom: max(18px, env(safe-area-inset-bottom));
  z-index: 1999;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  padding: 10px 14px;
  border: 1px solid rgba(15, 23, 42, 0.2);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.96);
  color: #111827;
  box-shadow: 0 10px 28px rgba(15, 23, 42, 0.2);
  font: 700 0.9rem/1 system-ui, -apple-system, "Segoe UI", sans-serif;
  cursor: pointer;
}

.pwa-install-button[hidden] {
  display: none;
}

.pwa-install-button:hover,
.pwa-install-button:focus-visible {
  transform: translateY(-1px);
  box-shadow: 0 13px 32px rgba(15, 23, 42, 0.25);
}

.pwa-install-button:focus-visible,
.pwa-install-close:focus-visible,
.pwa-install-done:focus-visible {
  outline: 3px solid #6366f1;
  outline-offset: 3px;
}

.pwa-install-dialog {
  width: min(420px, calc(100% - 32px));
  padding: 0;
  border: 1px solid rgba(15, 23, 42, 0.2);
  border-radius: 18px;
  background: #fff;
  color: #111827;
  box-shadow: 0 24px 70px rgba(15, 23, 42, 0.32);
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
}

.pwa-install-dialog::backdrop {
  background: rgba(15, 23, 42, 0.58);
}

.pwa-install-dialog form {
  position: relative;
  padding: 24px;
}

.pwa-install-dialog h2 {
  margin: 0 38px 12px 0;
  font-size: 1.35rem;
}

.pwa-install-dialog p {
  margin: 10px 0;
  line-height: 1.5;
}

.pwa-install-close {
  position: absolute;
  top: 14px;
  right: 14px;
  width: 36px;
  height: 36px;
  border: 0;
  border-radius: 50%;
  background: #f1f5f9;
  color: #111827;
  font-size: 1.5rem;
  cursor: pointer;
}

.pwa-install-done {
  width: 100%;
  min-height: 44px;
  margin-top: 12px;
  border: 0;
  border-radius: 10px;
  background: #111827;
  color: #fff;
  font: inherit;
  font-weight: 750;
  cursor: pointer;
}

body.dark-mode .pwa-install-button,
html.dark-mode .pwa-install-button,
body.dark-mode .pwa-install-dialog,
html.dark-mode .pwa-install-dialog {
  border-color: #475569;
  background: #111827;
  color: #f8fafc;
}

body.dark-mode .pwa-install-close,
html.dark-mode .pwa-install-close {
  background: #334155;
  color: #f8fafc;
}

body.dark-mode .pwa-install-done,
html.dark-mode .pwa-install-done {
  background: #f8fafc;
  color: #111827;
}

@media (display-mode: standalone) {
  .pwa-install-button {
    display: none;
  }
}

@media (max-width: 480px) {
  .pwa-install-button {
    max-width: calc(100% - 36px);
  }
}