.theme-tieu-hoc { background: linear-gradient(135deg, #e8f5e9 0%, #c8e6c9 100%); }
.theme-tieu-hoc .game-header h1 { color: #2e7d32; }

.question-area {
    text-align: center; padding: 20px; margin-bottom: 16px;
    background: #fff; border-radius: 16px; box-shadow: 0 2px 12px rgba(0,0,0,0.06);
}
.q-emoji { font-size: 3.5rem; margin-bottom: 8px; }
.q-text { font-size: 1.1rem; font-weight: 800; color: #333; }
.q-hint { font-size: 0.85rem; color: #999; margin-top: 4px; font-weight: 600; }

.choices-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; }
.choice-btn {
    padding: 16px; border: 3px solid #e0e0e0; border-radius: 16px;
    background: #fff; font-family: 'Baloo 2', cursive; font-size: 1.1rem;
    font-weight: 800; color: #333; cursor: pointer; transition: all 0.15s;
    box-shadow: 0 3px 0 #e0e0e0; text-align: center;
}
.choice-btn:hover { transform: translateY(-2px); box-shadow: 0 5px 0 #e0e0e0; }
.choice-btn:active { transform: translateY(3px); box-shadow: 0 0 0; }
.choice-btn.correct { background: #e8f5e9; border-color: #4caf50; color: #2e7d32; animation: bounceIn 0.4s; pointer-events: none; }
.choice-btn.wrong { background: #ffebee; border-color: #f44336; color: #c62828; animation: shake 0.4s; }

@keyframes bounceIn { 0%{transform:scale(.8)}50%{transform:scale(1.15)}100%{transform:scale(1)} }
@keyframes shake { 0%,100%{transform:translateX(0)}25%{transform:translateX(-6px)}75%{transform:translateX(6px)} }