:root{--primary-color: #4A90E2;--secondary-color: #7ED321;--accent-color: #F5A623;--danger-color: #FF5252;--success-color: #4CAF50;--warning-color: #FF9800;--text-dark: #333333;--text-light: #666666;--background-light: #FAFAFA;--border-light: #E0E0E0;--shadow-light: rgba(0, 0, 0, .1);--border-radius: 12px;--transition: all .3s ease}*{box-sizing:border-box}body{margin:0;padding:0;font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background:linear-gradient(135deg,#667eea,#764ba2);min-height:100vh;color:var(--text-dark)}.screen{max-width:600px;margin:0 auto;padding:2rem;background:#fff;min-height:100vh;box-shadow:0 0 30px #0000001a;position:relative;display:flex;flex-direction:column;align-items:center;text-align:center}h1,h2,h3{font-family:Space 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button span{font-size:1.5rem;flex-shrink:0}.menu-buttons button:hover:not(:disabled){transform:translateY(-3px);box-shadow:0 8px 24px #0003}.menu-buttons button:disabled{background:linear-gradient(135deg,#ccc,#999);cursor:not-allowed;opacity:.6}.menu-buttons button:disabled:hover{transform:none;box-shadow:0 4px 16px #0000001a}.back-home-button{background:var(--secondary-color);color:#fff;border:none;padding:.8rem 1.2rem;border-radius:25px;font-weight:600;cursor:pointer;transition:var(--transition);box-shadow:0 4px 12px #0000001a}.back-home-button:hover{transform:translateY(-2px);box-shadow:0 6px 16px #00000026}.game-question-display{font-size:2.5rem;font-weight:700;margin:1.5rem 0;padding:1.5rem;background:linear-gradient(135deg,#f8f9fa,#e9ecef);border-radius:var(--border-radius);border:2px solid var(--border-light);box-shadow:0 4px 16px #0000000d;display:flex;align-items:center;justify-content:center;gap:.5rem;flex-wrap:wrap}.red-number{color:#e74c3c;background:#e74c3c1a;padding:.2rem 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.8rem;border-radius:20px;color:#fff;min-width:40px;text-align:center}.red-label{background:#e74c3c}.blue-label{background:#3498db}.combined-label{background:#27ae60}.blocks-container{display:flex;flex-wrap:wrap;gap:.3rem;justify-content:center;max-width:120px}.visual-block{width:20px;height:20px;border-radius:4px;animation:blockAppear .5s ease-out both}.red-block{background:#e74c3c;box-shadow:0 2px 4px #e74c3c4d}.blue-block{background:#3498db;box-shadow:0 2px 4px #3498db4d}.plus-sign{font-size:2rem;font-weight:700;color:var(--text-dark);transition:var(--transition)}.plus-sign.fade-out{opacity:0;transform:scale(.5)}.combined-blocks-grid{display:grid;grid-template-columns:repeat(var(--grid-cols),1fr);gap:.3rem;justify-content:center;max-width:200px}.visual-subtraction-container{width:100%;max-width:500px;margin:1rem 0;padding:1.5rem;background:linear-gradient(135deg,#f8f9fa,#e9ecef);border-radius:var(--border-radius);box-shadow:0 4px 16px #0000000d}.subtraction-animation-area{display:flex;flex-direction:column;align-items:center;gap:1.5rem}.instruction-text{text-align:center;font-size:1.1rem;font-weight:600;color:var(--text-dark);min-height:2rem}.highlight-number{color:var(--primary-color);background:#4a90e21a;padding:.2rem .5rem;border-radius:6px;font-weight:700}.subtraction-blocks-grid{display:grid;grid-template-columns:repeat(var(--grid-cols),1fr);gap:.4rem;justify-content:center;max-width:300px}.subtraction-block{width:25px;height:25px;border-radius:6px;background:#3498db;box-shadow:0 2px 4px #3498db4d;transition:var(--transition);display:flex;align-items:center;justify-content:center;position:relative}.subtraction-block.initial{animation:blockAppear .5s ease-out both}.subtraction-block.removing{animation:blockRemove .8s ease-out both}.subtraction-block.removed{background:#e74c3c;opacity:.3;transform:scale(.8)}.subtraction-block.remaining{background:#27ae60;animation:blockHighlight .5s 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#0000000d}.multiplication-animation-area{display:flex;flex-direction:column;align-items:center;gap:1.5rem}.multiplication-groups{display:flex;gap:1rem;flex-wrap:wrap;justify-content:center}.multiplication-group{display:flex;flex-direction:column;align-items:center;gap:.8rem;padding:1rem;background:#fff;border-radius:var(--border-radius);box-shadow:0 2px 8px #0000000d;transition:var(--transition)}.multiplication-group.grouping{transform:scale(1.05);box-shadow:0 4px 16px #0000001a}.group-blocks{display:flex;flex-wrap:wrap;gap:.3rem;justify-content:center;max-width:80px}.multiplication-block{width:18px;height:18px;border-radius:4px;transition:var(--transition)}.multiplication-block.initial{animation:blockAppear .5s ease-out both}.multiplication-block.grouped{animation:blockGroup .8s ease-out both}.multiplication-block.combining{animation:blockCombine 1s ease-out 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#3498db4d;transition:var(--transition)}.initial-block{animation:blockAppear .5s ease-out both}.group-block{animation:blockDistribute .5s ease-out both}.division-groups{display:flex;gap:1rem;flex-wrap:wrap;justify-content:center;width:100%}.division-group-box{background:#fff;border:2px dashed var(--border-light);border-radius:var(--border-radius);padding:1rem;min-width:100px;min-height:120px;display:flex;flex-direction:column;align-items:center;gap:.8rem;transition:var(--transition)}.division-group-box:hover{border-color:var(--primary-color);background:#4a90e20d}.group-blocks-container{display:flex;flex-wrap:wrap;gap:.3rem;justify-content:center;flex:1;align-items:flex-start;max-width:80px}.visual-sequence-container{width:100%;max-width:600px;margin:1rem 0;padding:1.5rem;background:linear-gradient(135deg,#f8f9fa,#e9ecef);border-radius:var(--border-radius);box-shadow:0 4px 16px #0000000d}.sequence-animation-area{display:flex;flex-direction:column;align-items:center;gap:1.5rem}.sequence-display{width:100%;display:flex;justify-content:center}.sequence-tiles{display:flex;gap:.8rem;flex-wrap:wrap;justify-content:center}.sequence-tile{width:60px;height:60px;border-radius:var(--border-radius);display:flex;flex-direction:column;align-items:center;justify-content:center;position:relative;transition:var(--transition);opacity:0;transform:translateY(20px)}.sequence-tile.visible{opacity:1;transform:translateY(0)}.number-tile{background:linear-gradient(135deg,var(--primary-color),var(--secondary-color));color:#fff;box-shadow:0 4px 12px #0000001a}.missing-tile{background:#fff;border:3px dashed var(--accent-color);color:var(--accent-color)}.missing-tile.correct-reveal{background:linear-gradient(135deg,var(--success-color),#66bb6a);color:#fff;border-color:var(--success-color);animation:correctReveal .8s ease-out}.tile-content{display:flex;align-items:center;justify-content:center;width:100%;height:100%}.tile-number{font-size:1.5rem;font-weight:700}.tile-question{font-size:2rem;font-weight:700}.missing-indicator{position:absolute;bottom:-40px;display:flex;flex-direction:column;align-items:center;gap:.2rem}.missing-arrow{font-size:1.2rem;color:var(--accent-color);animation:bounce 1s infinite}.missing-text{font-size:.8rem;color:var(--accent-color);font-weight:700}.pattern-hint{background:#f5a6231a;border:1px solid var(--accent-color);border-radius:var(--border-radius);padding:1rem;text-align:center;max-width:400px}.pattern-hint p{margin:0;color:var(--text-dark);font-size:.9rem}.visual-odd-even-container{width:100%;max-width:600px;margin:1rem 0;padding:1.5rem;background:linear-gradient(135deg,#f8f9fa,#e9ecef);border-radius:var(--border-radius);box-shadow:0 4px 16px #0000000d}.odd-even-animation-area{display:flex;flex-direction:column;align-items:center;gap:1.5rem}.odd-even-options-wrapper{display:flex;gap:2rem;flex-wrap:wrap;justify-content:center;width:100%;opacity:0;transform:translateY(20px);transition:var(--transition)}.odd-even-options-wrapper.showing{opacity:1;transform:translateY(0)}.odd-even-number-option{background:#fff;border:3px solid var(--border-light);border-radius:var(--border-radius);padding:1.5rem;cursor:pointer;transition:var(--transition);display:flex;flex-direction:column;align-items:center;gap:1rem;min-width:150px;min-height:200px;position:relative;box-shadow:0 4px 16px #0000000d}.odd-even-number-option:hover:not(.disabled){transform:translateY(-5px);box-shadow:0 8px 24px #00000026;border-color:var(--primary-color)}.odd-even-number-option.wrong{background:linear-gradient(135deg,var(--danger-color),#ef5350);color:#fff;border-color:var(--danger-color);animation:wrongShake .6s 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var(--accent-color);border-radius:var(--border-radius);padding:1rem;text-align:center;max-width:500px}.odd-even-hint p{margin:0;color:var(--text-dark);font-size:.9rem;line-height:1.4}.visual-comparison-container{width:100%;max-width:700px;margin:1rem 0;padding:1.5rem;background:linear-gradient(135deg,#f8f9fa,#e9ecef);border-radius:var(--border-radius);box-shadow:0 4px 16px #0000000d}.comparison-animation-area{display:flex;flex-direction:column;align-items:center;gap:1.5rem}.comparison-statement{background:#fff;padding:1.5rem;border-radius:var(--border-radius);box-shadow:0 4px 12px #0000000d;text-align:center;opacity:0;transform:translateY(20px);transition:var(--transition)}.comparison-statement.showing{opacity:1;transform:translateY(0)}.comparison-expression{font-size:3rem;font-weight:700;display:flex;align-items:center;justify-content:center;gap:1rem;margin-bottom:.5rem;flex-wrap:wrap}.comparison-number{padding:.3rem .8rem;border-radius:12px;color:#fff;text-shadow:0 2px 4px 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#0000001a;min-width:80px;min-height:80px}.operator-symbol{font-size:3rem;color:var(--primary-color);font-weight:700}.comparison-options-wrapper{display:flex;gap:2rem;flex-wrap:wrap;justify-content:center;width:100%;opacity:0;transform:translateY(20px);transition:var(--transition)}.comparison-options-wrapper.showing{opacity:1;transform:translateY(0)}.comparison-answer-option{background:#fff;border:3px solid var(--border-light);border-radius:var(--border-radius);padding:2rem 1.5rem;cursor:pointer;transition:var(--transition);display:flex;flex-direction:column;align-items:center;gap:1rem;min-width:150px;min-height:120px;position:relative;box-shadow:0 4px 16px #0000000d}.comparison-answer-option:hover:not(.disabled){transform:translateY(-5px);box-shadow:0 8px 24px #00000026;border-color:var(--primary-color)}.comparison-answer-option.wrong{background:linear-gradient(135deg,var(--danger-color),#ef5350);color:#fff;border-color:var(--danger-color);animation:wrongShake .6s 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