.app-header{background:linear-gradient(135deg,#1565c0,#1976d2,#1e88e5);color:#fff;padding:0;box-shadow:0 4px 20px #1565c033;position:sticky;top:0;z-index:1000;border-bottom:1px solid rgba(255,255,255,.2)}.header-container{max-width:1200px;margin:0 auto;padding:20px;display:flex;justify-content:space-between;align-items:center}.header-left{flex:1}.app-title{font-size:2rem;font-weight:800;margin:0 0 5px;text-shadow:0 2px 4px rgba(0,0,0,.3);background:linear-gradient(45deg,#fff,#e3f2fd);background-clip:text;-webkit-background-clip:text;-webkit-text-fill-color:transparent}.app-subtitle{font-size:1rem;margin:0;opacity:.9;font-weight:500}.header-right{display:flex;align-items:center}.language-selector{display:flex;gap:8px;background:#ffffff26;padding:8px;border-radius:25px;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border:1px solid rgba(255,255,255,.2)}.lang-btn{background:transparent;border:none;color:#fff;padding:8px 16px;border-radius:20px;font-size:.9rem;font-weight:600;cursor:pointer;transition:all .3s ease;display:flex;align-items:center;gap:5px;min-width:60px;justify-content:center}.lang-btn:hover{background:#fff3;transform:translateY(-1px)}.lang-btn.active{background:#ffffff40;box-shadow:inset 0 2px 4px #0000001a;transform:none}.lang-btn:active{transform:translateY(0)}@media (max-width: 768px){.header-container{padding:15px 20px;flex-direction:column;gap:15px;text-align:center}.header-left{flex:none}.app-title{font-size:1.8rem}.app-subtitle{font-size:.95rem}.language-selector{margin:0}.lang-btn{padding:10px 18px;font-size:1rem}}@media (max-width: 480px){.header-container{padding:15px}.app-title{font-size:1.6rem}.app-subtitle{font-size:.9rem}.language-selector{gap:6px;padding:6px}.lang-btn{padding:8px 14px;font-size:.85rem;min-width:55px}}@keyframes slideDown{0%{transform:translateY(-100%);opacity:0}to{transform:translateY(0);opacity:1}}.app-header{animation:slideDown .5s ease}.main-menu{max-width:1000px;margin:0 auto;padding:40px 20px 100px}.welcome-section{text-align:center;margin-bottom:50px;padding:40px 20px;background:linear-gradient(135deg,#4caf501a,#ff6b6b1a,#9c27b01a);border-radius:20px;border:1px solid rgba(255,255,255,.2)}.welcome-title{font-size:3rem;font-weight:800;margin-bottom:15px;background:linear-gradient(135deg,#4caf50,#ff6b6b,#9c27b0);background-clip:text;-webkit-background-clip:text;-webkit-text-fill-color:transparent}.welcome-subtitle{font-size:1.3rem;color:#666;margin:0;font-weight:500}.stages-container{margin-bottom:50px}.stages-heading{text-align:center;font-size:2rem;color:#333;margin-bottom:30px;font-weight:700}.stages-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:25px;margin-bottom:30px}.stage-card{background:#fff;border-radius:20px;padding:30px 25px;cursor:pointer;transition:all .3s ease;position:relative;border:3px solid transparent;box-shadow:0 8px 30px #00000014;overflow:hidden}.stage-card:hover:not(.disabled){transform:translateY(-5px);box-shadow:0 15px 40px #0000001f}.stage-card.selected{transform:translateY(-5px);box-shadow:0 15px 40px #00000026;border-color:currentColor}.stage-card.disabled{opacity:.6;cursor:not-allowed;filter:grayscale(30%)}.completion-badge{position:absolute;top:15px;right:15px;background:linear-gradient(135deg,#4caf50,#45a049);color:#fff;padding:5px 12px;border-radius:20px;font-size:.8rem;font-weight:600;box-shadow:0 2px 8px #4caf504d}.stage-icon{width:80px;height:80px;border-radius:20px;display:flex;align-items:center;justify-content:center;font-size:2.5rem;margin-bottom:20px;color:#fff;box-shadow:0 4px 15px #0003}.stage-info{text-align:left}.stage-title{font-size:1.4rem;color:#333;margin-bottom:10px;font-weight:700}.stage-description{color:#666;font-size:1rem;margin-bottom:20px;line-height:1.5}.stage-meta{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:10px}.difficulty-badge{padding:6px 14px;border-radius:20px;font-size:.85rem;font-weight:600;text-transform:uppercase;letter-spacing:.5px}.items-count{color:#888;font-size:.9rem;font-weight:500}.coming-soon-overlay{position:absolute;top:15px;left:15px;background:linear-gradient(135deg,#ff9800,#f57c00);color:#fff;padding:6px 14px;border-radius:15px;font-size:.8rem;font-weight:600;box-shadow:0 2px 8px #ff98004d}.start-prompt{position:absolute;bottom:15px;right:15px;background:#000c;color:#fff;padding:8px 15px;border-radius:15px;font-size:.8rem;font-weight:600;animation:pulse 1.5s ease-in-out infinite}@keyframes pulse{0%,to{opacity:1}50%{opacity:.7}}.start-section{text-align:center;margin:40px 0}.start-button{color:#fff;border:none;padding:20px 40px;font-size:1.3rem;border-radius:30px;cursor:pointer;transition:all .3s ease;font-weight:700;text-transform:uppercase;letter-spacing:1px}.start-button:hover{transform:translateY(-3px);box-shadow:0 8px 25px #0000004d!important}.progress-section{background:#fff;border-radius:20px;padding:30px;box-shadow:0 8px 30px #00000014;text-align:center}.progress-section h3{color:#333;margin-bottom:25px;font-size:1.5rem;font-weight:700}.progress-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:25px}.progress-item{padding:25px 20px;background:linear-gradient(135deg,#f8f9fa,#e9ecef);border-radius:15px;border:1px solid #dee2e6;transition:all .3s ease}.progress-item:hover{transform:translateY(-2px);box-shadow:0 4px 15px #0000001a}.progress-number{font-size:2.5rem;font-weight:700;color:#4caf50;margin-bottom:8px}.progress-label{font-size:.9rem;color:#666;line-height:1.3;font-weight:500}@media (max-width: 768px){.main-menu{padding:20px 15px 120px}.welcome-title{font-size:2.2rem}.welcome-subtitle{font-size:1.1rem}.stages-grid{grid-template-columns:1fr;gap:20px}.stage-card{padding:25px 20px}.stage-icon{width:70px;height:70px;font-size:2rem}.progress-grid{grid-template-columns:1fr}.start-button{padding:18px 35px;font-size:1.1rem}}@media (max-width: 480px){.welcome-section{padding:30px 15px;margin-bottom:30px}.welcome-title{font-size:1.8rem}.stages-heading{font-size:1.6rem}.stage-title{font-size:1.2rem}.progress-number{font-size:2rem}.start-button{width:100%;max-width:300px}}@keyframes fadeInUp{0%{opacity:0;transform:translateY(30px)}to{opacity:1;transform:translateY(0)}}.stage-card{animation:fadeInUp .6s ease forwards}.stage-card:nth-child(2){animation-delay:.1s}.stage-card:nth-child(3){animation-delay:.2s}.progress-section{animation:fadeInUp .8s ease forwards;animation-delay:.3s}.welcome-section{animation:fadeInUp .6s ease forwards}.hangul-game{max-width:600px;margin:0 auto;padding:20px;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif}.game-start h1{font-size:2.5rem;color:#4caf50;margin-bottom:1rem}.info-box{background:#f8f9fa;border-radius:12px;padding:20px;margin:2rem 0;text-align:left}.info-box li:before{content:"✓ ";color:#4caf50;font-weight:700;margin-right:8px}.start-button{background:linear-gradient(135deg,#4caf50,#45a049);color:#fff;border:none;padding:15px 30px;font-size:1.2rem;border-radius:25px;cursor:pointer;transition:all .3s ease}.start-button:hover{transform:translateY(-2px);box-shadow:0 4px 15px #4caf504d}.progress-bar{width:100%;height:6px;background:#e0e0e0;border-radius:3px;margin-bottom:15px;overflow:hidden}.progress-fill{height:100%;background:linear-gradient(90deg,#4caf50,#81c784);transition:width .3s ease}.game-info{display:flex;justify-content:space-between;align-items:center;font-weight:600;color:#555}.hangul-display{font-size:8rem;font-weight:700;color:#333;margin:30px 0;text-shadow:0 2px 4px rgba(0,0,0,.1);font-family:Apple SD Gothic Neo,Malgun Gothic,sans-serif}.question-text{font-size:1.4rem;color:#444;margin-bottom:30px;font-weight:500}.option-button{background:#fff;border:2px solid #e0e0e0;padding:20px;border-radius:12px;font-size:1.1rem;cursor:pointer;transition:all .2s ease;font-weight:500}.option-button:hover{border-color:#4caf50;background:#f8f9fa;transform:translateY(-1px)}.option-button.correct{background:#4caf50;border-color:#4caf50;color:#fff;animation:correctPulse .6s ease}.option-button:disabled{cursor:not-allowed}@keyframes correctPulse{0%{transform:scale(1)}50%{transform:scale(1.05)}to{transform:scale(1)}}@keyframes incorrectShake{0%,20%,40%,60%,80%{transform:translate(-3px)}10%,30%,50%,70%,90%{transform:translate(3px)}to{transform:translate(0)}}.feedback{padding:20px;border-radius:12px;margin-top:20px;display:flex;flex-direction:column;gap:4px}.feedback.correct{background:#e8f5e8;border:2px solid #4CAF50}.feedback.incorrect{background:#ffebee;border:2px solid #f44336}.feedback span{font-size:2rem;display:block;margin-bottom:10px}.feedback p{margin:8px 0;font-weight:500}.feedback .example{font-style:italic;color:#666;font-size:.95rem}.game-result h2{font-size:2.5rem;color:#4caf50;margin-bottom:2rem}.score-display{background:#fff;border-radius:20px;padding:30px;margin:30px 0;box-shadow:0 4px 20px #0000001a}.score-big{font-size:4rem;font-weight:700;color:#4caf50;margin-bottom:10px}.accuracy{font-size:1.3rem;color:#666;font-weight:500}.result-message>div{padding:20px;border-radius:12px;margin:20px 0}.excellent{background:#e8f5e8;border:2px solid #4CAF50}.good{background:#fff3e0;border:2px solid #FF9800}.try-again{background:#ffebee;border:2px solid #f44336}.result-message span{font-size:2rem;display:block;margin-bottom:10px}.result-message p{font-size:1.1rem;margin:0;font-weight:500}.restart-button{background:linear-gradient(135deg,#2196f3,#1976d2);color:#fff;border:none;padding:15px 30px;font-size:1.2rem;border-radius:25px;cursor:pointer;transition:all .3s ease}.restart-button:hover{transform:translateY(-2px);box-shadow:0 4px 15px #2196f34d}@media (max-width: 768px){.hangul-game{padding:15px}.hangul-display{font-size:6rem}.options{grid-template-columns:1fr}.score-big{font-size:3rem}}@media (max-width: 480px){.hangul-display{font-size:4.5rem}.game-start h1{font-size:2rem}.question-text{font-size:1.2rem}}.word-game{max-width:700px;margin:0 auto;padding:20px;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif}.game-start{text-align:center;padding:40px 20px}.game-start h1{font-size:2.5rem;color:#ff6b6b;margin-bottom:1rem}.game-start p{font-size:1.3rem;color:#666;margin-bottom:2rem}.category-selection{margin:2rem 0}.category-selection h3{color:#333;margin-bottom:1.5rem;font-size:1.4rem}.category-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:15px;margin-bottom:2rem}.category-btn{background:#fff;border:3px solid #e0e0e0;border-radius:15px;padding:20px 15px;cursor:pointer;transition:all .3s ease;text-align:center;min-height:120px;display:flex;flex-direction:column;justify-content:center;align-items:center}.category-btn:hover{border-color:#ff6b6b;transform:translateY(-3px);box-shadow:0 8px 25px #ff6b6b33}.category-btn.selected{border-color:#ff6b6b;background:linear-gradient(135deg,#ff6b6b,#ff8e53);color:#fff;transform:translateY(-3px);box-shadow:0 8px 25px #ff6b6b4d}.category-icon{font-size:2.5rem;margin-bottom:8px}.category-label{font-weight:600;margin-bottom:5px;font-size:1rem}.category-count{font-size:.85rem;opacity:.8}.info-box{background:#f8f9fa;border-radius:12px;padding:20px;margin:2rem 0;text-align:left;border-left:4px solid #FF6B6B}.info-box h3{color:#333;margin-bottom:1rem}.info-box ul{list-style:none;padding:0}.info-box li{padding:8px 0;color:#555}.info-box li:before{content:"✓ ";color:#ff6b6b;font-weight:700;margin-right:8px}.start-button{background:linear-gradient(135deg,#ff6b6b,#ff8e53);color:#fff;border:none;padding:18px 35px;font-size:1.3rem;border-radius:30px;cursor:pointer;transition:all .3s ease;font-weight:600}.start-button:hover{transform:translateY(-3px);box-shadow:0 8px 25px #ff6b6b4d}.game-header{margin-bottom:30px}.progress-bar{width:100%;height:8px;background:#e0e0e0;border-radius:4px;margin-bottom:15px;overflow:hidden}.progress-fill{height:100%;background:linear-gradient(90deg,#ff6b6b,#ff8e53);transition:width .3s ease}.game-info{display:flex;flex-wrap:wrap;gap:8px;justify-content:space-between;align-items:center;font-weight:600;color:#555;margin-bottom:10px}.streak-indicator{background:linear-gradient(135deg,#ff6b6b,#ff8e53);color:#fff;padding:4px 12px;border-radius:15px;font-size:.9rem;animation:pulse 1s ease-in-out infinite alternate}@keyframes pulse{0%{transform:scale(1)}to{transform:scale(1.05)}}.category-indicator{text-align:center;background:#f8f9fa;padding:8px 15px;border-radius:20px;font-size:.9rem;color:#666;border:1px solid #e0e0e0}.question-section{text-align:center}.question-type{font-size:1rem;color:#ff6b6b;margin-bottom:20px;font-weight:600;text-transform:uppercase;letter-spacing:1px}.word-display{margin:30px 0;padding:30px;background:#fff;border-radius:20px;box-shadow:0 4px 20px #0000001a}.main-word{font-size:3.5rem;font-weight:700;color:#333;margin-bottom:15px;line-height:1.2}.romanization{font-size:1.4rem;color:#888;font-style:italic;margin-bottom:15px}.word-category{font-size:1rem;color:#ff6b6b;background:#fff5f5;padding:6px 15px;border-radius:15px;display:inline-block;text-transform:capitalize}.options{display:grid;grid-template-columns:1fr 1fr;gap:15px;margin:30px 0}.option-button{background:#fff;border:3px solid #e0e0e0;padding:25px 20px;border-radius:15px;font-size:1.2rem;cursor:pointer;transition:all .2s ease;text-align:center;font-weight:500;min-height:80px;display:flex;align-items:center;justify-content:center}.option-button:hover{border-color:#ff6b6b;background:#fff5f5;transform:translateY(-2px)}.option-button.correct{background:#4caf50;border-color:#4caf50;color:#fff;animation:correctBounce .6s ease}.option-button.incorrect{background:#f44336;border-color:#f44336;color:#fff;animation:incorrectShake .6s ease}.option-button.disabled{opacity:.6;cursor:not-allowed}.option-text{line-height:1.3}@keyframes correctBounce{0%,20%,60%,to{transform:translateY(0)}40%,80%{transform:translateY(-8px)}}@keyframes incorrectShake{0%,20%,40%,60%,80%{transform:translate(-5px)}10%,30%,50%,70%,90%{transform:translate(5px)}to{transform:translate(0)}}.result-feedback{margin-top:30px}.feedback{padding:25px;border-radius:15px;margin-top:20px}.feedback.correct{background:#e8f5e8;border:3px solid #4CAF50}.feedback.incorrect{background:#ffebee;border:3px solid #f44336}.feedback span{font-size:2rem;display:block;margin-bottom:15px}.feedback p{margin:10px 0;font-weight:500;font-size:1.1rem}.streak-bonus{color:#ff6b6b;font-weight:700;font-size:1rem}.word-details{background:#fffc;padding:15px;border-radius:10px;margin-top:15px;text-align:left}.word-details p{margin:8px 0;font-size:.95rem}.game-result{text-align:center;padding:40px 20px}.game-result h2{font-size:2.5rem;color:#ff6b6b;margin-bottom:2rem}.score-display{background:#fff;border-radius:20px;padding:40px 30px;margin:30px 0;box-shadow:0 4px 30px #0000001a}.score-big{font-size:4rem;font-weight:700;color:#ff6b6b;margin-bottom:15px}.accuracy{font-size:1.4rem;color:#666;font-weight:500;margin-bottom:20px}.streak-display{margin-top:20px}.current-streak{font-size:1.2rem;color:#333}.streak-number{color:#ff6b6b;font-weight:700;font-size:1.5rem}.new-record{background:linear-gradient(135deg,gold,orange);color:#fff;padding:4px 12px;border-radius:15px;font-size:.8rem;margin-left:10px;animation:celebrateNewRecord 2s ease-in-out infinite alternate}@keyframes celebrateNewRecord{0%{transform:scale(1)}to{transform:scale(1.1)}}.result-message{margin:30px 0}.result-message>div{padding:25px;border-radius:15px;margin:20px 0}.excellent{background:#e8f5e8;border:3px solid #4CAF50}.good{background:#fff3e0;border:3px solid #FF9800}.try-again{background:#ffebee;border:3px solid #f44336}.result-message span{font-size:2.5rem;display:block;margin-bottom:15px}.result-message p{font-size:1.2rem;margin:0;font-weight:500}.result-actions{display:flex;gap:15px;justify-content:center;flex-wrap:wrap}.restart-button,.category-button{background:linear-gradient(135deg,#ff6b6b,#ff8e53);color:#fff;border:none;padding:15px 30px;font-size:1.1rem;border-radius:25px;cursor:pointer;transition:all .3s ease;font-weight:600}.category-button{background:linear-gradient(135deg,#2196f3,#21cbf3)}.restart-button:hover,.category-button:hover{transform:translateY(-2px);box-shadow:0 4px 15px #0003}@media (max-width: 768px){.word-game{padding:15px}.main-word{font-size:2.5rem}.options{grid-template-columns:1fr;gap:12px}.option-button{padding:20px 15px;font-size:1.1rem}.category-grid{grid-template-columns:repeat(2,1fr)}.result-actions{flex-direction:column;align-items:center}.restart-button,.category-button{width:200px}}@media (max-width: 480px){.main-word{font-size:2rem}.score-big{font-size:3rem}.category-grid{grid-template-columns:1fr}}.pwa-controls{position:fixed;bottom:20px;right:20px;display:flex;flex-direction:column;gap:10px;z-index:999}.install-btn,.notification-btn{background:linear-gradient(135deg,#1565c0,#1976d2);color:#fff;border:none;padding:12px 20px;border-radius:25px;font-size:.9rem;font-weight:600;cursor:pointer;transition:all .3s ease;display:flex;align-items:center;gap:8px;box-shadow:0 4px 15px #1565c04d;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);white-space:nowrap}.install-btn:hover,.notification-btn:hover{transform:translateY(-2px);box-shadow:0 6px 20px #1565c066}.notification-btn{background:linear-gradient(135deg,#1976d2,#2196f3);box-shadow:0 4px 15px #1976d24d}.notification-btn:hover{box-shadow:0 6px 20px #1976d266}.pwa-status{position:fixed;bottom:20px;right:20px;display:flex;flex-direction:column;align-items:flex-end;gap:10px;background:#fffffff2;padding:15px;border-radius:15px;box-shadow:0 4px 20px #0000001a;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border:1px solid rgba(255,255,255,.2);z-index:999}.pwa-status.installed span{color:#1565c0;font-weight:600;font-size:.9rem}.notification-status{color:#1565c0;font-weight:600;padding:8px 16px;background:#1565c01a;border-radius:20px;border:1px solid rgba(21,101,192,.3);font-size:.8rem}.pwa-controls>div:first-child{background:#000c;color:#fff;padding:8px 12px;border-radius:8px;font-size:.7rem;max-width:250px;line-height:1.2}.install-info{background:#fffffff2;padding:15px;border-radius:12px;box-shadow:0 4px 15px #0000001a;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);max-width:280px;font-size:.85rem}.install-info p{margin:0 0 10px;font-weight:600;color:#333}.install-info ul{margin:0;padding-left:16px}.install-info li{margin:4px 0;color:#666;line-height:1.3}@media (max-width: 768px){.pwa-controls,.pwa-status{position:fixed;bottom:20px;left:15px;right:15px;max-width:none}.pwa-controls{flex-direction:column;gap:12px;align-items:stretch}.install-btn,.notification-btn{flex:none;justify-content:center;padding:14px 20px;font-size:.9rem;border-radius:12px;min-height:50px}.pwa-status{align-items:center;text-align:center;flex-direction:column;gap:12px}.install-info{max-width:none}.sentence-game,.hangul-game,.word-game{padding-bottom:140px}}@media (max-width: 480px){.pwa-controls,.pwa-status{bottom:15px;left:10px;right:10px}.install-btn,.notification-btn{padding:12px 16px;font-size:.85rem;min-height:46px}}@media (display-mode: standalone){.install-btn{display:none}}.App{min-height:100vh;width:100%;background:linear-gradient(135deg,#e3f2fd,#bbdefb,#90caf9);display:flex;flex-direction:column}.main-content{flex:1;position:relative;min-height:calc(100vh - 80px)}.back-button{background:#ffffffe6;color:#333;border:2px solid #e0e0e0;padding:12px 20px;border-radius:25px;font-size:1rem;font-weight:600;cursor:pointer;margin:20px;transition:all .3s ease;position:fixed;top:100px;left:20px;z-index:100;box-shadow:0 4px 15px #0000001a;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.back-button:hover{background:#fff;border-color:#1565c0;color:#1565c0;transform:translateY(-2px);box-shadow:0 6px 20px #1565c026}.back-button:active{transform:translateY(0)}.coming-soon-stage{display:flex;align-items:center;justify-content:center;min-height:70vh;padding:40px 20px}.coming-soon-content{text-align:center;background:#fff;padding:60px 40px;border-radius:20px;box-shadow:0 8px 30px #0000001a;max-width:500px;width:100%}.coming-soon-content h2{font-size:2.5rem;color:#9c27b0;margin-bottom:20px;font-weight:700}.coming-soon-content p{font-size:1.2rem;color:#666;line-height:1.6;margin:15px 0}.coming-soon-content p:last-child{margin-top:25px;font-weight:600;color:#9c27b0}@media (max-width: 768px){.back-button{position:static;margin:20px auto;display:block;width:fit-content}.main-content{min-height:calc(100vh - 120px)}.coming-soon-content{padding:40px 30px;margin:20px}.coming-soon-content h2{font-size:2rem}.coming-soon-content p{font-size:1.1rem}}@media (max-width: 480px){.coming-soon-content{padding:30px 20px}.coming-soon-content h2{font-size:1.8rem}.coming-soon-content p{font-size:1rem}}@keyframes fadeIn{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}.main-content{animation:fadeIn .5s ease}@media (display-mode: standalone){.App{background:linear-gradient(135deg,#e3f2fd,#bbdefb,#90caf9)}}.sentence-game{padding:20px;max-width:800px;margin:0 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