/* Theme: Dark Mode */
body.theme-dark {
  --primary: #60a5fa;
  --primary-dark: #3b82f6;
  --accent: #93c5fd;
  --bg: #1a1a2e;
  --card-bg: #16213e;
  --text: #e2e8f0;
  --text-muted: #94a3b8;
  --border: #334155;
}

body.theme-dark .login-card,
body.theme-dark .card,
body.theme-dark .sidebar,
body.theme-dark .mobile-nav { background: var(--card-bg); }
body.theme-dark .expense-card { background: var(--card-bg); }
body.theme-dark .expense-table tr:hover { background: rgba(255,255,255,0.03); }
body.theme-dark .mobile-nav a.active { color: var(--primary); background: rgba(96, 165, 250, 0.15); }