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0;width:150px;flex-wrap:nowrap}.digit-image{text-align:center}.digit-image img{width:60px;height:60px;object-fit:contain;border-radius:5px;border:1px solid #ddd}.letters{font-size:12px;margin-top:5px;color:#666}.response-container{margin-top:0}.response-prompt{margin-bottom:10px;font-weight:700}.response-button{background-color:#3498db;color:#fff;border:none;padding:8px 15px;border-radius:5px;cursor:pointer;font-size:14px;margin:0 5px;transition:background-color .2s}.response-button:hover:not(:disabled){background-color:#2980b9}.response-button:disabled{background-color:#95a5a6;cursor:not-allowed}.progress{text-align:center;margin-top:20px;color:#666}@media (max-width: 600px){.card-container{height:250px}.number,.word{font-size:24px}}.number-memory{max-width:800px;margin:0 auto}.major-system-app{font-family:Roboto,sans-serif;color:#333;max-width:1200px;margin:0}.content{padding:20px 10px 10px}body{margin:0;padding:0}