.theme-circuit { background: linear-gradient(135deg, #fff9c4 0%, #fff176 100%); }
.theme-circuit .game-header h1 { color: #f57f17; }
.circuit-card { background: white; border-radius: 16px; padding: 25px; margin: 15px auto; max-width: 480px; box-shadow: 0 6px 20px rgba(0,0,0,0.08); font-size: 1.15rem; font-weight: 600; font-family: 'Nunito',sans-serif; color: #333; line-height: 1.7; text-align: center; }
.circuit-card .formula { font-size: 1.4rem; font-weight: 800; color: #f57f17; font-family: 'Baloo 2', cursive; margin: 10px 0; }
.circuit-options { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; max-width: 380px; margin: 15px auto; padding: 0 15px; }
.circuit-opt { padding: 14px; border: 2px solid #fff176; border-radius: 14px; background: white; text-align: center; font-size: 1.1rem; font-family: 'Nunito',sans-serif; font-weight: 700; cursor: pointer; transition: all 0.2s; }
.circuit-opt:hover { background: #fffde7; border-color: #fdd835; }
.circuit-opt.correct { background: #e8f5e9; border-color: #4caf50; }
.circuit-opt.wrong { background: #ffebee; border-color: #f44336; }
.circuit-opt.disabled { pointer-events: none; opacity: 0.6; }