body[data-theme="stars"] {
  background: radial-gradient(ellipse at top, #1a1240 0%, #0a0820 60%, #000 100%);
}
body[data-theme="stars"] .star {
  position: absolute;
  background: white;
  border-radius: 50%;
  animation: twinkle ease-in-out infinite;
}
@keyframes twinkle {
  0%, 100% { opacity: .2; transform: scale(.6); }
  50% { opacity: 1; transform: scale(calc(1 + 0.5 * var(--bass, 0))); }
}
body[data-theme="stars"] .profile-card {
  box-shadow: 0 0 calc(60px * var(--bass, 0)) rgba(150, 180, 255, .8);
  transform: scale(calc(1 + 0.04 * var(--beat, 0)));
  transition: transform .08s linear;
}