.pulse-sphere {
  width: 100px;
  height: 100px;
  background: radial-gradient(circle, var(--accent-secondary), var(--accent-primary));
  border-radius: 50%;
  margin: 20px auto;
  animation: pulse 3s infinite ease-in-out;
  box-shadow: 0 0 20px var(--accent-secondary);
}

@keyframes pulse {
  0% { transform: scale(0.9); opacity: 0.7; }
  50% { transform: scale(1.1); opacity: 1; }
  100% { transform: scale(0.9); opacity: 0.7; }
}