.install-app {
  position: fixed;
  right: max(18px, env(safe-area-inset-right));
  bottom: max(18px, env(safe-area-inset-bottom));
  z-index: 50;
  min-height: 42px;
  padding: 0 16px;
  border: 1px solid rgba(150, 240, 255, .58);
  border-radius: 999px;
  background: linear-gradient(135deg, #38d5ed, #168dca);
  color: #00131c;
  box-shadow: 0 12px 28px rgba(12, 151, 204, .32);
  font: 700 12px/1 'Kantumruy Pro', 'Manrope', sans-serif;
}
.install-app:hover { filter: brightness(1.08); }