@keyframes batteryTickWarn { 0%, 49% { background-color: rgba(255,255,255,.95); } 50%, 100% { background-color: rgba(239,68,68,.95); } }
  .battery-tick-warn { animation: batteryTickWarn .4s steps(2,end) infinite; }
  @keyframes batteryUrgentFlash { 0%, 49% { opacity: 1; } 50%, 100% { opacity: .25; } }
  .battery-urgent-flash { animation: batteryUrgentFlash .4s steps(2,end) infinite; }