body {
  background: #f5f6fa;
}
.dialpad .btn {
  font-weight: 600;
  transition: all 0.1s;
}
.dialpad .btn:active {
  transform: scale(0.95);
  background: #0d6efd;
  color: #fff;
}
#phoneNumber {
  font-size: 1.3rem;
  letter-spacing: 1px;
}
#callStatus {
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.7; }
}
#incomingCall {
  animation: ring 0.5s infinite alternate;
}
@keyframes ring {
  from { transform: scale(1); }
  to { transform: scale(1.02); }
}