.missing-number-container{display:flex;flex-direction:column;align-items:center;padding:2rem;min-height:100vh;background:linear-gradient(135deg,#667eea,#764ba2)}.missing-number-header{text-align:center;margin-bottom:2rem}.missing-number-header h2{font-size:2rem;color:#fff;margin-bottom:.5rem}.score-display{font-size:1.2rem;color:#fff;font-weight:600}.sequence-display{gap:1rem;margin-bottom:3rem;flex-wrap:wrap}.sequence-box,.sequence-display{display:flex;justify-content:center}.sequence-box{width:70px;height:70px;background:#fff;border-radius:16px;align-items:center;font-size:2rem;font-weight:700;color:#667eea;box-shadow:0 4px 12px rgba(0,0,0,.15)}.sequence-box.missing{background:hsla(0,0%,100%,.3);border:3px dashed #fff;color:#fff;font-size:3rem}.options-grid{display:grid;grid-template-columns:repeat(2,1fr);grid-gap:1rem;gap:1rem;max-width:400px;width:100%}.option-button{padding:1.5rem;font-size:2rem;font-weight:700;background:#fff;border:3px solid #e0e0e0;border-radius:20px;cursor:pointer;transition:all .2s;color:#667eea;box-shadow:0 4px 12px rgba(0,0,0,.1)}.option-button:hover:not(:disabled){border-color:#667eea;box-shadow:0 6px 16px rgba(102,126,234,.3)}.option-button:disabled{cursor:not-allowed;opacity:.6}.option-button.correct{background:#58cc02;border-color:#58cc02;color:#fff;transform:scale(1.05)}.option-button.wrong{background:#ff4b4b;border-color:#ff4b4b;color:#fff}.celebration-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background:rgba(0,0,0,.8);display:flex;align-items:center;justify-content:center;z-index:1000}.celebration-content{background:#fff;border-radius:32px;padding:3rem;text-align:center;box-shadow:0 20px 60px rgba(0,0,0,.3)}.celebration-icon{font-size:5rem;margin-bottom:1rem}.celebration-content h2{font-size:2.5rem;color:#58cc02;margin-bottom:1rem}.celebration-content p{font-size:1.5rem;color:#666;margin-bottom:2rem}.stars{display:flex;gap:1rem;justify-content:center;font-size:3rem}@media (max-width:768px){.missing-number-container{padding:1rem}.sequence-box{width:60px;height:60px;font-size:1.5rem}.options-grid{gap:.8rem}.option-button{padding:1.2rem;font-size:1.5rem}}