:root {
  --bg:           #0f172a;
  --surface:      #1e293b;
  --surface-alt:  #334155;
  --border:       #334155;
  --border-input: #475569;
  --primary:      #0ea5e9;
  --primary-hover:#0284c7;
  --accent:       #38bdf8;
  --text:         #e2e8f0;
  --text-sec:     #94a3b8;
  --text-muted:   #64748b;
  --correct-bg:   rgba(52,211,153,0.15);
  --correct-text: #34d399;
  --wrong-bg:     rgba(248,113,113,0.15);
  --wrong-text:   #f87171;
}