.device-warning-banner {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  display: flex;
  justify-content: center;
  padding: 0.85rem 1.25rem;
  background: linear-gradient(to right, rgba(0,0,0,0.85), rgba(0,0,0,0.75));
  color: #fff;
  font: 500 0.85rem/1.3 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  letter-spacing: 0.4px;
  z-index: 2000;
  gap: 1rem;
  box-shadow: 0 -4px 16px rgba(0,0,0,0.6);
  backdrop-filter: blur(8px) saturate(140%);
  -webkit-backdrop-filter: blur(8px) saturate(140%);
}
.device-warning-banner.hidden { opacity: 0; pointer-events: none; }
.device-warning-text { flex: 1; text-align: center; }
.device-warning-actions { display: flex; align-items: center; gap: 0.75rem; }
.device-warning-btn {
  background: rgba(255,255,255,0.12);
  color: #fff;
  border: 1px solid rgba(255,255,255,0.3);
  padding: 0.5rem 0.9rem;
  border-radius: 6px;
  cursor: pointer;
  font: 600 0.7rem/1 system-ui, sans-serif;
  letter-spacing: 0.5px;
  transition: background 0.2s ease, transform 0.2s ease;
}
.device-warning-btn:hover { background: rgba(255,255,255,0.2); transform: translateY(-2px); }
.device-warning-btn:active { transform: translateY(0); }
@media (min-width: 1024px){
  .device-warning-banner { display: none; }
}
@media (max-width: 420px){
  .device-warning-text { font-size: 0.7rem; }
  .device-warning-btn { font-size: 0.6rem; padding: 0.45rem 0.7rem; }
}