.game-menu{display:flex;justify-content:center;align-items:center;min-height:100vh;padding:20px}.menu-container{background:#fffffff2;border-radius:20px;padding:40px;box-shadow:0 20px 40px #0000001a;max-width:800px;width:100%;text-align:center}.game-title{font-size:3rem;color:#2c3e50;margin-bottom:10px;font-weight:700;text-shadow:2px 2px 4px rgba(0,0,0,.1)}.game-subtitle{font-size:1.2rem;color:#7f8c8d;margin-bottom:30px}.user-progress-overview{background:#f8f9fa;border-radius:15px;padding:25px;margin-bottom:30px;text-align:left}.progress-stats{display:flex;justify-content:space-around;margin-bottom:25px;gap:20px}.stat-item{display:flex;flex-direction:column;align-items:center;text-align:center}.stat-label{font-size:.9rem;color:#6c757d;margin-bottom:5px}.stat-value{font-size:1.8rem;font-weight:700;color:#2c3e50}.achievements-section h3{color:#2c3e50;margin-bottom:15px;font-size:1.3rem;text-align:center}.achievements-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:15px}.achievement-item{display:flex;align-items:center;gap:12px;background:#fff;padding:15px;border-radius:10px;box-shadow:0 2px 8px #0000001a;transition:transform .2s ease}.achievement-item:hover{transform:translateY(-2px)}.achievement-icon{font-size:2rem;flex-shrink:0}.achievement-info{flex:1}.achievement-name{font-weight:700;color:#2c3e50;margin-bottom:3px}.achievement-progress{font-size:.9rem;color:#6c757d;margin-bottom:3px}.achievement-level{font-size:.8rem;color:#28a745;font-weight:700}.menu-content h2{font-size:1.8rem;color:#34495e;margin-bottom:30px}.grade-buttons{display:flex;flex-direction:column;gap:20px;margin-bottom:40px}.grade-container{position:relative}.grade-button{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;border:none;border-radius:15px;padding:25px;font-size:1.3rem;cursor:pointer;transition:all .3s ease;display:flex;flex-direction:column;align-items:center;gap:8px;box-shadow:0 8px 16px #667eea4d;width:100%;position:relative}.grade-button:hover:not(.disabled){transform:translateY(-5px);box-shadow:0 12px 24px #667eea66}.grade-button:active:not(.disabled){transform:translateY(-2px)}.grade-button.disabled{background:#6c757d;cursor:not-allowed;opacity:.7}.grade-name{font-size:1.5rem;font-weight:700}.grade-desc{font-size:.9rem;opacity:.9}.grade-completed{font-size:.8rem;color:#28a745;font-weight:700}.lock-overlay{position:absolute;top:0;left:0;right:0;bottom:0;background:#000c;border-radius:15px;display:flex;flex-direction:column;align-items:center;justify-content:center;color:#fff;gap:8px}.lock-icon{font-size:2rem}.lock-text{font-size:.9rem;text-align:center}.level-indicators{display:flex;justify-content:center;gap:8px;margin-top:10px}.level-indicator{width:30px;height:30px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:.9rem;font-weight:700;transition:all .3s ease}.level-indicator.completed{background:#28a745;color:#fff}.level-indicator.current{background:#007bff;color:#fff;animation:pulse 2s infinite}.level-indicator.locked{background:#6c757d;color:#fff;opacity:.5}.game-rules{background:#f8f9fa;border-radius:15px;padding:25px;text-align:left}.game-rules h3{color:#2c3e50;margin-bottom:15px;font-size:1.3rem;text-align:center}.game-rules ul{list-style:none;padding:0}.game-rules li{color:#5a6c7d;margin-bottom:10px;padding-left:25px;position:relative;line-height:1.6}.game-rules li:before{content:"✓";position:absolute;left:0;color:#27ae60;font-weight:700;font-size:1.1rem}@media (max-width: 768px){.menu-container{padding:30px 20px}.game-title{font-size:2.5rem}.progress-stats{flex-direction:column;gap:15px}.achievements-grid{grid-template-columns:1fr}.grade-button{padding:20px;font-size:1.1rem}.grade-name{font-size:1.3rem}}.game-play{display:flex;flex-direction:column;align-items:center;min-height:100vh;padding:20px;background:linear-gradient(135deg,#667eea,#764ba2)}.game-header{width:100%;max-width:800px;display:flex;justify-content:space-between;align-items:center;background:#fffffff2;border-radius:15px;padding:20px;margin-bottom:30px;box-shadow:0 8px 16px #0000001a;flex-wrap:wrap;gap:15px}.level-info{display:flex;align-items:center}.current-level{font-size:1.2rem;font-weight:700;color:#2c3e50;background:linear-gradient(135deg,#667eea,#764ba2);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;padding:8px 15px;border-radius:20px;border:2px solid #667eea}.score-board{display:flex;gap:30px;align-items:center}.score{font-size:1.3rem;font-weight:700;color:#2c3e50}.lives{display:flex;gap:5px;align-items:center}.heart{font-size:1.2rem;transition:all .3s ease}.heart.active{opacity:1;transform:scale(1)}.heart.inactive{opacity:.3;transform:scale(.8)}.progress-section{flex:1;min-width:200px}.progress-info{display:flex;justify-content:space-between;align-items:center;margin-bottom:8px;font-size:.9rem;color:#5a6c7d}.progress-percentage{font-weight:700;color:#27ae60}.progress-bar{width:100%;height:8px;background:#ecf0f1;border-radius:4px;overflow:hidden;box-shadow:inset 0 2px 4px #0000001a}.progress-fill{height:100%;background:linear-gradient(90deg,#27ae60,#2ecc71);border-radius:4px;transition:width .5s ease;box-shadow:0 2px 4px #27ae604d}.streak{font-size:1.1rem;color:#27ae60;font-weight:700;white-space:nowrap}.bonus{color:#f39c12;font-size:.9rem}.menu-button-container{display:flex;align-items:center}.menu-button{background:linear-gradient(135deg,#e74c3c,#c0392b);color:#fff;border:none;border-radius:10px;padding:10px 15px;font-size:1rem;font-weight:700;cursor:pointer;transition:all .3s ease;box-shadow:0 4px 8px #e74c3c4d;white-space:nowrap}.menu-button:hover{transform:translateY(-2px);box-shadow:0 6px 12px #e74c3c66}.menu-button:active{transform:translateY(0)}.game-content{background:#fffffff2;border-radius:20px;padding:40px;box-shadow:0 20px 40px #0000001a;max-width:800px;width:100%;text-align:center;position:relative}.character-display{margin-bottom:40px;transition:all .3s ease}.character-display.shake{animation:shake .5s ease-in-out}@keyframes shake{0%,to{transform:translate(0)}25%{transform:translate(-10px)}75%{transform:translate(10px)}}.character{font-size:8rem;font-weight:700;color:#2c3e50;margin-bottom:10px;text-shadow:2px 2px 4px rgba(0,0,0,.1)}.meaning{font-size:1.5rem;color:#7f8c8d;font-weight:500}.question h2{font-size:1.8rem;color:#34495e;margin-bottom:30px}.options-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px;margin-bottom:30px}.option-button{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;border:none;border-radius:15px;padding:25px;font-size:1.5rem;font-weight:700;cursor:pointer;transition:all .3s ease;box-shadow:0 8px 16px #667eea4d}.option-button:hover:not(:disabled){transform:translateY(-5px);box-shadow:0 12px 24px #667eea66}.option-button:active:not(:disabled){transform:translateY(-2px)}.option-button.selected{background:linear-gradient(135deg,#f39c12,#e67e22);transform:scale(1.05)}.option-button.correct{background:linear-gradient(135deg,#27ae60,#2ecc71);animation:pulse .5s ease-in-out}.option-button.incorrect{background:linear-gradient(135deg,#e74c3c,#c0392b);animation:pulse .5s ease-in-out}@keyframes pulse{0%{transform:scale(1)}50%{transform:scale(1.1)}to{transform:scale(1)}}.option-button:disabled{cursor:not-allowed;opacity:.8}.result-message{font-size:1.5rem;font-weight:700;padding:15px;border-radius:10px;animation:fadeIn .5s ease-in-out}.result-message.correct{background:#d5f4e6;color:#27ae60;border:2px solid #27ae60}.result-message.incorrect{background:#fadbd8;color:#e74c3c;border:2px solid #e74c3c}.combo-effect{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);z-index:10;animation:comboAppear .8s ease-out}.combo-effect.special{animation:comboSpecial 1.2s ease-out}@keyframes comboAppear{0%{opacity:0;transform:translate(-50%,-50%) scale(.5)}50%{opacity:1;transform:translate(-50%,-50%) scale(1.2)}to{opacity:1;transform:translate(-50%,-50%) scale(1)}}@keyframes comboSpecial{0%{opacity:0;transform:translate(-50%,-50%) scale(.5) rotate(0)}25%{opacity:1;transform:translate(-50%,-50%) scale(1.3) rotate(5deg)}50%{opacity:1;transform:translate(-50%,-50%) scale(1.1) rotate(-5deg)}75%{opacity:1;transform:translate(-50%,-50%) scale(1.2) rotate(3deg)}to{opacity:1;transform:translate(-50%,-50%) scale(1) rotate(0)}}.combo-text{font-size:3rem;font-weight:700;color:#f39c12;text-shadow:2px 2px 4px rgba(0,0,0,.3);background:linear-gradient(45deg,#f39c12,#e67e22,#f39c12);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;animation:comboGlow .8s ease-in-out infinite alternate}@keyframes comboGlow{0%{filter:drop-shadow(0 0 10px rgba(243,156,18,.5))}to{filter:drop-shadow(0 0 20px rgba(243,156,18,.8))}}.combo-sparkles{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:200px;height:200px}.sparkle{position:absolute;top:50%;left:50%;font-size:1.5rem;animation:sparkleRotate 1s ease-out;transform-origin:center}@keyframes sparkleRotate{0%{opacity:0;transform:translate(-50%,-50%) rotate(var(--angle)) translateY(0) scale(0)}50%{opacity:1;transform:translate(-50%,-50%) rotate(var(--angle)) translateY(-30px) scale(1)}to{opacity:0;transform:translate(-50%,-50%) rotate(var(--angle)) translateY(-60px) scale(.5)}}@media (max-width: 768px){.game-header{flex-direction:column;gap:15px;text-align:center}.score-board{flex-direction:column;gap:15px}.progress-section{width:100%}.current-level{font-size:1rem;padding:6px 12px}.menu-button{font-size:.9rem;padding:8px 12px}.character{font-size:6rem}.options-grid{grid-template-columns:1fr}.option-button{padding:20px;font-size:1.3rem}.combo-text{font-size:2rem}.combo-sparkles{width:150px;height:150px}.sparkle{font-size:1.2rem}}.game-over{display:flex;justify-content:center;align-items:center;min-height:100vh;padding:20px;background:linear-gradient(135deg,#667eea,#764ba2)}.game-over-container{background:#fffffff2;border-radius:20px;padding:40px;box-shadow:0 20px 40px #0000001a;max-width:600px;width:100%;text-align:center}.game-over-title{font-size:3rem;color:#e74c3c;margin-bottom:30px;font-weight:700;text-shadow:2px 2px 4px rgba(0,0,0,.1)}.score-display{font-size:4rem;font-weight:700;color:#2c3e50;background:linear-gradient(135deg,#667eea,#764ba2);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;text-shadow:none}.game-over-message{margin-bottom:40px;color:#7f8c8d;line-height:1.6}.game-over-message p{font-size:1.2rem;margin-bottom:10px}@media (max-width: 768px){.game-over-container{padding:30px 20px}.game-over-title{font-size:2.5rem}.score-display{font-size:3rem}.action-buttons{flex-direction:column;align-items:center}.restart-button,.menu-button{width:100%;max-width:250px}}.game-victory{display:flex;justify-content:center;align-items:center;min-height:100vh;padding:20px;background:linear-gradient(135deg,#667eea,#764ba2)}.victory-container{background:#fffffff2;border-radius:20px;padding:40px;box-shadow:0 20px 40px #0000001a;max-width:600px;width:100%;text-align:center}.victory-header{margin-bottom:30px}.victory-title{font-size:3rem;color:#27ae60;margin-bottom:15px;font-weight:700;text-shadow:2px 2px 4px rgba(0,0,0,.1)}.grade-badge{display:inline-block;background:linear-gradient(135deg,#f39c12,#e67e22);color:#fff;padding:8px 20px;border-radius:20px;font-size:1.1rem;font-weight:700;box-shadow:0 4px 8px #f39c124d}.victory-message{margin-bottom:30px;color:#7f8c8d;line-height:1.6}.victory-message p{font-size:1.2rem;margin-bottom:10px}.achievement{display:flex;align-items:center;justify-content:center;gap:15px;background:linear-gradient(135deg,#f39c12,#e67e22);color:#fff;padding:20px;border-radius:15px;margin-bottom:40px;box-shadow:0 8px 16px #f39c124d}.achievement-icon{font-size:3rem}.achievement-text h3{font-size:1.3rem;margin-bottom:5px}.achievement-text p{font-size:1.1rem;opacity:.9}.restart-button,.menu-button{padding:15px 30px;font-size:1.2rem;font-weight:700;border:none;border-radius:10px;cursor:pointer;transition:all .3s ease;min-width:150px}.restart-button{background:linear-gradient(135deg,#27ae60,#2ecc71);color:#fff;box-shadow:0 8px 16px #27ae604d}.restart-button:hover{transform:translateY(-3px);box-shadow:0 12px 24px #27ae6066}@media (max-width: 768px){.victory-container{padding:30px 20px}.victory-title{font-size:2.5rem}.score-display{font-size:3rem}.achievement{flex-direction:column;text-align:center}.action-buttons{flex-direction:column;align-items:center}.restart-button,.menu-button{width:100%;max-width:250px}}.level-complete{display:flex;justify-content:center;align-items:center;min-height:100vh;padding:20px;background:linear-gradient(135deg,#667eea,#764ba2)}.level-complete-container{background:#fffffff2;border-radius:20px;padding:40px;box-shadow:0 20px 40px #0000001a;max-width:600px;width:100%;text-align:center}.level-complete-header{margin-bottom:30px}.level-complete-title{font-size:3rem;color:#27ae60;margin-bottom:15px;font-weight:700;text-shadow:2px 2px 4px rgba(0,0,0,.1)}.level-badge{display:inline-block;background:linear-gradient(135deg,#f39c12,#e67e22);color:#fff;padding:8px 20px;border-radius:20px;font-size:1.1rem;font-weight:700;box-shadow:0 4px 8px #f39c124d}.final-score{margin-bottom:30px}.final-score h2{font-size:1.5rem;color:#34495e;margin-bottom:15px}.score-display{font-size:4rem;font-weight:700;color:#2c3e50;background:linear-gradient(135deg,#27ae60,#2ecc71);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;text-shadow:none}.level-complete-message{margin-bottom:40px;color:#7f8c8d;line-height:1.6}.level-complete-message p{font-size:1.2rem;margin-bottom:10px}.action-buttons{display:flex;gap:20px;justify-content:center;flex-wrap:wrap}.next-level-button,.menu-button{padding:15px 30px;font-size:1.2rem;font-weight:700;border:none;border-radius:10px;cursor:pointer;transition:all .3s ease;min-width:150px}.next-level-button{background:linear-gradient(135deg,#27ae60,#2ecc71);color:#fff;box-shadow:0 8px 16px #27ae604d}.next-level-button:hover{transform:translateY(-3px);box-shadow:0 12px 24px #27ae6066}.menu-button{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;box-shadow:0 8px 16px #667eea4d}.menu-button:hover{transform:translateY(-3px);box-shadow:0 12px 24px #667eea66}@media (max-width: 768px){.level-complete-container{padding:30px 20px}.level-complete-title{font-size:2.5rem}.score-display{font-size:3rem}.action-buttons{flex-direction:column;align-items:center}.next-level-button,.menu-button{width:100%;max-width:250px}}.App{min-height:100vh;font-family:Microsoft YaHei,PingFang SC,Helvetica Neue,Arial,sans-serif}@keyframes fadeIn{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}@keyframes slideIn{0%{opacity:0;transform:translate(-50px)}to{opacity:1;transform:translate(0)}}@media (max-width: 768px){.App{padding:10px}}::-webkit-scrollbar{width:8px}::-webkit-scrollbar-track{background:#f1f1f1;border-radius:4px}::-webkit-scrollbar-thumb{background:#c1c1c1;border-radius:4px}::-webkit-scrollbar-thumb:hover{background:#a8a8a8}:root{font-family:Microsoft YaHei,PingFang SC,Helvetica Neue,Arial,sans-serif;line-height:1.5;font-weight:400;color-scheme:light dark;color:#ffffffde;background-color:#242424;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;-webkit-text-size-adjust:100%}*{margin:0;padding:0;box-sizing:border-box}body{margin:0;display:flex;place-items:center;min-width:320px;min-height:100vh;background:linear-gradient(135deg,#667eea,#764ba2)}#root{max-width:1280px;margin:0 auto;padding:2rem;text-align:center;width:100%}button{border-radius:8px;border:1px solid transparent;padding:.6em 1.2em;font-size:1em;font-weight:500;font-family:inherit;background-color:#1a1a1a;color:#fff;cursor:pointer;transition:border-color .25s}button:hover{border-color:#646cff}button:focus,button:focus-visible{outline:4px auto -webkit-focus-ring-color}@media (prefers-color-scheme: light){:root{color:#213547;background-color:#fff}button{background-color:#f9f9f9;color:#213547}}