#pwa-install-shell {
  position: fixed;
  right: max(16px, env(safe-area-inset-right));
  bottom: max(16px, env(safe-area-inset-bottom));
  z-index: 2147483646;
  display: none;
  align-items: center;
  gap: 6px;
  padding: 6px;
  border: 1px solid rgba(0, 224, 255, 0.42);
  border-radius: 999px;
  background: rgba(7, 13, 28, 0.96);
  box-shadow: 0 12px 38px rgba(0, 0, 0, 0.48), 0 0 22px rgba(0, 224, 255, 0.2);
  font-family: Arial, Helvetica, sans-serif;
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  transition: transform 180ms ease, box-shadow 180ms ease, border-color 180ms ease;
}

#pwa-install-shell.is-visible {
  display: flex;
  animation: pwa-install-in 220ms ease-out;
}

#pwa-install-button,
#pwa-install-collapse,
#pwa-install-modal-close {
  border: 0;
  cursor: pointer;
  font: inherit;
}

#pwa-install-collapse {
  width: 34px;
  height: 34px;
  flex: 0 0 34px;
  display: grid;
  place-items: center;
  border-radius: 999px;
  color: #00e0ff;
  background: rgba(20, 28, 50, 0.82);
  border: 1px solid rgba(0, 224, 255, 0.28);
}

#pwa-install-collapse svg {
  width: 22px;
  height: 22px;
  fill: currentColor;
}

#pwa-install-button {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 10px 14px;
  border-radius: 999px;
  color: #04202a;
  background: linear-gradient(135deg, #00e0ff, #00a3bd);
  font-size: 14px;
  font-weight: 800;
  white-space: nowrap;
  transition: opacity 160ms ease, max-width 180ms ease, padding 180ms ease, margin 180ms ease;
  max-width: 190px;
}

#pwa-install-button svg {
  width: 19px;
  height: 19px;
  fill: currentColor;
}

#pwa-install-button:focus-visible,
#pwa-install-collapse:focus-visible,
#pwa-install-modal-close:focus-visible {
  outline: 3px solid #ffc700;
  outline-offset: 2px;
}

#pwa-install-shell.is-collapsed {
  transform: translateX(calc(100% - 46px));
  border-color: rgba(255, 199, 0, 0.36);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.42), 0 0 18px rgba(255, 199, 0, 0.16);
}

#pwa-install-shell.is-collapsed #pwa-install-button {
  max-width: 0;
  padding-left: 0;
  padding-right: 0;
  opacity: 0;
  overflow: hidden;
  pointer-events: none;
}

#pwa-install-modal {
  position: fixed;
  inset: 0;
  z-index: 2147483647;
  display: none;
  place-items: center;
  padding: 22px;
  background: rgba(3, 7, 17, 0.78);
  font-family: Arial, Helvetica, sans-serif;
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
}

#pwa-install-modal.is-visible {
  display: grid;
}

.pwa-install-card {
  width: min(100%, 390px);
  padding: 22px;
  border: 1px solid rgba(0, 224, 255, 0.4);
  border-radius: 18px;
  color: #dae2fd;
  background: linear-gradient(180deg, #141c32, #0d1326);
  box-shadow: 0 22px 60px rgba(0, 0, 0, 0.55);
}

.pwa-install-card h2 {
  margin: 0 0 10px;
  color: #00e0ff;
  font-size: 21px;
}

.pwa-install-card p {
  margin: 0 0 18px;
  color: #cdd7ea;
  font-size: 15px;
  line-height: 1.5;
}

.pwa-install-steps {
  margin: 0 0 18px;
  padding-left: 22px;
  color: #cdd7ea;
  font-size: 15px;
  line-height: 1.5;
}

.pwa-install-steps li + li {
  margin-top: 8px;
}

#pwa-install-modal-close {
  width: 100%;
  padding: 11px 16px;
  border-radius: 10px;
  color: #04202a;
  background: #00e0ff;
  font-weight: 800;
}

@keyframes pwa-install-in {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 600px) {
  #pwa-install-shell {
    right: max(10px, env(safe-area-inset-right));
    bottom: max(76px, calc(env(safe-area-inset-bottom) + 70px));
  }
}

@media (prefers-reduced-motion: reduce) {
  #pwa-install-shell.is-visible { animation: none; }
}