body{font-family:Segoe UI,sans-serif;margin:0;padding:0;transition:background .3s,color .3s;--bg: #1a1a2e;--text: #eee;--muted: #888;--card: #16213e;--card2: #1a1a3e;--border: #444;--hover: #1a1a5e;--accent: #7ec8e3;--accent2: #d4a5ff;--correct-bg: #1b4332;--correct-border: #2d6a4f;--correct-text: #86efac;--wrong-bg: #641220;--wrong-border: #a4161a;--wrong-text: #fca5a5;--select-bg: #16213e;--select-text: #eee;background:var(--bg);color:var(--text)}body.light-theme{--bg: #f0f2f5;--text: #1a1a2e;--muted: #666;--card: #fff;--card2: #f8f9fa;--border: #ddd;--hover: #e8eaf0;--accent: #0f3460;--accent2: #533483;--correct-bg: #d1fae5;--correct-border: #34d399;--correct-text: #065f46;--wrong-bg: #fee2e2;--wrong-border: #f87171;--wrong-text: #991b1b;--select-bg: #fff;--select-text: #1a1a2e}