.chatbook-install-app-btn,
.chatbook-install-app-trigger,
.chatbook-apk-download-trigger{
  border:0;
  background:#0866ff;
  color:#fff;
  border-radius:999px;
  padding:12px 18px;
  font-weight:800;
  box-shadow:0 14px 30px rgba(8,102,255,.28);
  cursor:pointer;
  text-decoration:none;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
}
.chatbook-apk-download-trigger{background:#111827;}
.chatbook-install-app-btn{
  position:fixed;
  left:50%;
  bottom:84px;
  transform:translateX(-50%) translateY(12px);
  z-index:999999;
  opacity:0;
  pointer-events:none;
  transition:opacity .2s ease, transform .2s ease;
  white-space:nowrap;
}
.chatbook-install-app-btn.is-visible{
  opacity:1;
  transform:translateX(-50%) translateY(0);
  pointer-events:auto;
}
.chatbook-app-download-card,
.chatbook-pwa-status{
  background:#fff;
  border:1px solid #e5e7eb;
  border-radius:18px;
  padding:18px;
  box-shadow:0 12px 32px rgba(15,23,42,.08);
  margin:18px 0;
}
.chatbook-app-download-card h2{margin:0 0 8px;font-size:24px;line-height:1.2}
.chatbook-app-download-card p{color:#64748b;margin:0 0 14px}
.chatbook-app-download-actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:12px}
.chatbook-app-download-note{font-size:13px;color:#64748b;margin-top:12px!important}
.chatbook-pwa-status ul{padding-left:20px;line-height:1.9}
.chatbook-pwa-note{color:#64748b;font-size:14px;margin-top:12px}
.chatbook-pwa-standalone .chatbook-install-app-btn,
.chatbook-pwa-standalone .chatbook-install-app-trigger,
.chatbook-pwa-standalone .chatbook-apk-download-floating{display:none!important}
@media (display-mode: standalone){
  .chatbook-install-app-btn,
  .chatbook-install-app-trigger,
  .chatbook-apk-download-floating{display:none!important}
}
@media (min-width: 900px){
  .chatbook-install-app-btn{left:auto;right:24px;bottom:24px;transform:translateY(12px)}
  .chatbook-install-app-btn.is-visible{transform:translateY(0)}
}