[data-theme="dark"] {
  --bg: #0b1020;
  --card: #111827;
  --text: #e5e7eb;
  --muted: #a7b2c5;
  --border: #1f2937;
  --primary: #60a5fa;
  --primary-600: #3b82f6;
  --chip: #1e293b;
  --shadow: 0 10px 30px rgba(0,0,0,0.25);
}
/* Dunkles Theme – spezielle UI-Elemente */
[data-theme="dark"] .bubble {
  background: #0f172a;
  border-color: #1f2937;
}
[data-theme="dark"] .chip {
  border-color: #334155;
  color: #93c5fd;
}