.letter-learner{width:100%;min-height:100vh;padding:20px;display:flex;flex-direction:column;align-items:center;justify-content:center}.back-button{position:absolute;top:20px;left:20px;background:#f0f0f0;color:#333;border:2px solid #667eea;padding:10px 20px;border-radius:8px;font-size:16px;font-weight:600;cursor:pointer;transition:all .3s ease}.letter-container{background:white;border-radius:30px;padding:40px;max-width:600px;width:100%;box-shadow:0 20px 60px #0000004d;animation:fadeIn .5s ease-out}.progress-bar{width:100%;height:8px;background:#e0e0e0;border-radius:10px;margin-bottom:30px;overflow:hidden}.progress-fill{height:100%;background:linear-gradient(90deg,#667eea 0%,#764ba2 100%);transition:width .5s ease}.letter-display{text-align:center;margin-bottom:30px}.letter-big{font-size:7rem;font-weight:900;background:linear-gradient(135deg,#667eea 0%,#764ba2 100%);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;margin-bottom:10px;text-shadow:none;animation:letterBounce .8s cubic-bezier(.68,-.55,.265,1.55)}@keyframes letterBounce{0%{transform:scale(0) rotateY(180deg);opacity:0}50%{transform:scale(1.1)}to{transform:scale(1) rotateY(0);opacity:1}}.letter-emoji{font-size:5rem;margin:15px 0;animation:emojiPop .6s ease-out}@keyframes emojiPop{0%{transform:scale(0) rotate(-180deg);opacity:0}70%{transform:scale(1.15)}to{transform:scale(1) rotate(0);opacity:1}}.letter-description{font-size:1.4rem;color:#444;margin:0;font-weight:600}.speak-button{width:100%;padding:20px;font-size:1.4rem;background:linear-gradient(135deg,#667eea 0%,#764ba2 100%);color:#fff;border:none;border-radius:20px;margin-bottom:30px;font-weight:700;transition:all .3s ease;cursor:pointer;box-shadow:0 8px 20px #667eea4d}.speak-button:hover{transform:scale(1.05);box-shadow:0 10px 25px #667eea66}.speak-button:active{transform:scale(.98)}.words-section{margin-bottom:30px}.words-section h3{color:#333;margin-bottom:15px;font-size:1.1rem}.words-list{display:grid;grid-template-columns:repeat(auto-fit,minmax(120px,1fr));gap:10px}.word-item{padding:18px 15px;background:linear-gradient(135deg,#f093fb 0%,#f5576c 100%);color:#fff;border-radius:15px;text-align:center;cursor:pointer;font-weight:700;font-size:1rem;transition:all .3s ease;-webkit-user-select:none;user-select:none;box-shadow:0 5px 15px #f5576c33}.word-item:hover{transform:translateY(-5px);box-shadow:0 8px 20px #f5576c4d}.word-item:active{transform:translateY(0)}.navigation{display:flex;justify-content:space-between;align-items:center;gap:20px;margin-top:30px}.nav-button{flex:1;padding:12px 20px;background:linear-gradient(135deg,#4facfe 0%,#00f2fe 100%);color:#fff;border:none;border-radius:10px;font-weight:600;font-size:1rem;cursor:pointer;transition:all .3s ease}.nav-button:hover:not(:disabled){transform:scale(1.05);box-shadow:0 8px 20px #4facfe4d}.counter{color:#667eea;font-weight:600;font-size:1.1rem;min-width:80px;text-align:center}@media (max-width: 600px){.letter-container{padding:25px 20px}.letter-big{font-size:3.5rem}.letter-description{font-size:1.1rem}.words-list{grid-template-columns:repeat(auto-fit,minmax(100px,1fr));gap:8px}.word-item{padding:12px;font-size:.95rem}.navigation{gap:10px}.nav-button{padding:10px 15px;font-size:.9rem}.counter{font-size:.95rem;min-width:70px}.back-button{top:10px;left:10px;padding:8px 15px;font-size:14px}}.word-emoji{font-size:2rem;display:block}.word-text{font-size:.9rem;color:#333}.word-item:hover{transform:translateY(-5px);box-shadow:0 8px 20px #00000026;border-color:#667eea!important}.word-item.selected{background:linear-gradient(135deg,#667eea 0%,#764ba2 100%)!important;color:#fff!important;border-color:#667eea!important;box-shadow:0 10px 30px #667eea66}.word-item.selected .word-text{color:#fff}.selected-word-display{padding:25px;background:linear-gradient(135deg,#f0f4ff 0%,#f5f5ff 100%);border-radius:15px;text-align:center;margin:20px 0;border:2px solid #667eea;animation:fadeIn .4s ease-out}.selected-word-display h4{color:#333;font-size:1.1rem;margin-bottom:15px}.word-image-display{font-size:5rem;animation:bounce .6s ease-out}.quiz{width:100%;padding:20px;display:flex;flex-direction:column;align-items:center;justify-content:center}.quiz .back-button{position:absolute;top:20px;left:20px;background:#f0f0f0;color:#333;border:2px solid #667eea;padding:10px 20px;border-radius:8px;font-size:16px;font-weight:600;cursor:pointer;transition:all .3s ease}.quiz .back-button:hover{background:#e0e0e0;transform:scale(1.05);border-color:#764ba2}.quiz-container{background:white;border-radius:30px;padding:40px;max-width:700px;width:100%;box-shadow:0 20px 60px #0000004d;animation:fadeIn .5s ease-out}@keyframes fadeIn{0%{opacity:0;transform:scale(.95)}to{opacity:1;transform:scale(1)}}.quiz-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:30px;padding-bottom:20px;border-bottom:2px solid #eee}.quiz-progress{font-size:1rem;color:#666;font-weight:600}.quiz-score{font-size:1.2rem;color:#667eea;font-weight:700;background:#f0f4ff;padding:8px 16px;border-radius:8px}.question-section{text-align:center;margin-bottom:40px}.question-section h2{font-size:1.5rem;color:#333;margin-bottom:20px}.speak-button{padding:18px 40px;font-size:1.3rem;background:linear-gradient(135deg,#f093fb 0%,#f5576c 100%);color:#fff;border:none;border-radius:15px;font-weight:700;transition:all .3s ease;cursor:pointer;box-shadow:0 8px 20px #f5576c4d}.speak-button:hover{transform:scale(1.05);box-shadow:0 10px 25px #f5576c66}.options-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(100px,1fr));gap:20px;margin-bottom:30px}.option-button{padding:30px 20px;background:#f5f5f5;border:3px solid #ddd;border-radius:15px;font-size:1.5rem;font-weight:700;cursor:pointer;transition:all .3s ease;position:relative;display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:140px}.option-button:hover:not(:disabled){border-color:#667eea;background:#f9f9ff;transform:translateY(-5px)}.option-button:disabled{cursor:not-allowed}.option-letter{font-size:2.5rem;margin-bottom:10px}.option-feedback{font-size:1.2rem;height:30px;display:flex;align-items:center;justify-content:center;font-weight:700}.option-button.correct{border-color:#52c41a;background:linear-gradient(135deg,#d4edda 0%,#c3e6cb 100%);color:#155724}.option-button.correct .option-feedback{color:#52c41a;font-size:1.8rem}.option-button.incorrect{border-color:#f5576c;background:linear-gradient(135deg,#f8d7da 0%,#f5c6cb 100%);color:#721c24}.option-button.incorrect .option-feedback{color:#f5576c;font-size:1.8rem}.next-button{width:100%;padding:15px;font-size:1.2rem;background:linear-gradient(135deg,#4facfe 0%,#00f2fe 100%);color:#fff;border:none;border-radius:12px;font-weight:600;transition:all .3s ease;cursor:pointer;animation:slideUp .3s ease-out}@keyframes slideUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}.next-button:hover{transform:scale(1.05);box-shadow:0 10px 25px #4facfe66}.results{text-align:center}.results h1{font-size:2.5rem;color:#333;margin-bottom:30px}.score-circle{width:200px;height:200px;border-radius:50%;background:linear-gradient(135deg,#667eea 0%,#764ba2 100%);display:flex;align-items:center;justify-content:center;margin:0 auto 30px;box-shadow:0 15px 35px #667eea66}.score-text{display:flex;align-items:baseline;color:#fff}.score-number{font-size:3.5rem;font-weight:900}.score-total{font-size:1.5rem;opacity:.9;margin-left:5px}.score-message{font-size:1.3rem;color:#666;margin-bottom:30px;font-weight:500}.restart-button{padding:15px 40px;font-size:1.1rem;background:linear-gradient(135deg,#f093fb 0%,#f5576c 100%);color:#fff;border:none;border-radius:12px;font-weight:600;transition:all .3s ease;cursor:pointer}.restart-button:hover{transform:scale(1.05);box-shadow:0 10px 25px #f5576c66}@media (max-width: 600px){.quiz-container{padding:25px 20px}.quiz-header{flex-direction:column;gap:15px;align-items:center}.options-grid{grid-template-columns:repeat(2,1fr);gap:15px}.option-button{padding:25px 15px;min-height:120px}.option-letter{font-size:2rem;margin-bottom:8px}.option-feedback{font-size:1rem}.question-section h2{font-size:1.2rem}.score-circle{width:150px;height:150px}.score-number{font-size:2.5rem}.score-total{font-size:1.2rem}.score-message{font-size:1.1rem}}.word-builder{width:100%;min-height:100vh;padding:20px;display:flex;flex-direction:column;align-items:center;justify-content:center}.back-button{position:absolute;top:20px;left:20px;background:#f0f0f0;color:#333;border:2px solid #667eea;padding:10px 20px;border-radius:8px;font-size:16px;font-weight:600;cursor:pointer;transition:all .3s ease;z-index:10}.back-button:hover{background:#e0e0e0;transform:scale(1.05);border-color:#764ba2}.word-builder-container{background:white;border-radius:30px;padding:40px;max-width:800px;width:100%;box-shadow:0 20px 60px #0000004d;animation:slideIn .5s ease-out}@keyframes slideIn{0%{opacity:0;transform:translateY(30px)}to{opacity:1;transform:translateY(0)}}.progress-section{margin-bottom:30px}.progress-bar{width:100%;height:10px;background:#e0e0e0;border-radius:10px;overflow:hidden;margin-bottom:12px}.progress-fill{height:100%;background:linear-gradient(90deg,#4facfe 0%,#00f2fe 100%);transition:width .5s ease}.progress-text{text-align:center;color:#666;font-size:.95rem;margin:0;font-weight:500}.letter-header{text-align:center;margin-bottom:40px}.letter-display{animation:popIn .6s ease-out}@keyframes popIn{0%{transform:scale(.5);opacity:0}to{transform:scale(1);opacity:1}}.large-letter{font-size:5rem;font-weight:900;background:linear-gradient(135deg,#4facfe 0%,#00f2fe 100%);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;margin:0;text-shadow:none}.letter-name{font-size:1.3rem;color:#555;margin:8px 0 0;font-weight:600}.letter-emoji-big{font-size:4.5rem;margin-bottom:10px;animation:emojiFloat 3s ease-in-out infinite}@keyframes emojiFloat{0%,to{transform:translateY(0)}50%{transform:translateY(-15px)}}.words-building-section{margin-bottom:30px}.words-building-section h2{color:#333;margin-bottom:10px;font-size:1.4rem}.words-hint{color:#999;font-size:.95rem;margin-bottom:20px;font-style:italic}.words-container{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:15px;margin-bottom:25px}.word-card{aspect-ratio:1;cursor:pointer;perspective:1000px}.word-card-inner{position:relative;width:100%;height:100%;transition:transform .6s;transform-style:preserve-3d}.word-card.revealed .word-card-inner{transform:rotateY(180deg)}.word-card-front,.word-card-back{position:absolute;width:100%;height:100%;display:flex;align-items:center;justify-content:center;border-radius:15px;font-weight:700;backface-visibility:hidden}.word-card-front{background:linear-gradient(135deg,#f093fb 0%,#f5576c 100%);color:#fff;font-size:2rem;border:2px solid transparent}.word-card:hover .word-card-front{border-color:#fff;box-shadow:0 8px 20px #f5576c4d;transform:scale(1.05)}.word-card-back{background:linear-gradient(135deg,#667eea 0%,#764ba2 100%);color:#fff;font-size:1.1rem;transform:rotateY(180deg);flex-direction:column;gap:10px;padding:20px;text-align:center}.word-number{font-size:1.8rem}.revealed-word{font-size:1.2rem;word-break:break-word}.speak-indicator{font-size:1.5rem;animation:pulse 1.5s infinite}@keyframes pulse{0%,to{opacity:1}50%{opacity:.5}}.reveal-all-button{width:100%;padding:18px;font-size:1.2rem;background:linear-gradient(135deg,#667eea 0%,#764ba2 100%);color:#fff;border:none;border-radius:15px;font-weight:700;transition:all .3s ease;cursor:pointer;box-shadow:0 8px 20px #667eea4d}.reveal-all-button:hover{transform:scale(1.05);box-shadow:0 10px 25px #667eea66}.achievements{text-align:center;padding:20px;background:#f5f5f5;border-radius:15px;margin-bottom:30px}.achievements p{font-size:1.1rem;color:#666;margin:0;font-weight:500}.count{color:#4facfe;font-weight:700;font-size:1.2rem}.navigation{display:flex;justify-content:space-between;gap:20px}.nav-button{flex:1;padding:12px 20px;background:linear-gradient(135deg,#f093fb 0%,#f5576c 100%);color:#fff;border:none;border-radius:10px;font-weight:600;font-size:1rem;cursor:pointer;transition:all .3s ease}.nav-button:hover:not(:disabled){transform:scale(1.05);box-shadow:0 8px 20px #f5576c4d}.nav-button:disabled{opacity:.5;cursor:not-allowed}@media (max-width: 700px){.word-builder-container{padding:25px 20px}.large-letter{font-size:3.5rem}.letter-name{font-size:1.1rem}.words-building-section h2{font-size:1.2rem}.words-hint{font-size:.9rem}.words-container{grid-template-columns:repeat(auto-fit,minmax(120px,1fr));gap:12px}.word-card-front{font-size:1.5rem}.word-card-back{font-size:1rem;padding:15px;gap:8px}.revealed-word{font-size:1.1rem}.back-button{top:10px;left:10px;padding:8px 15px;font-size:14px}}.word-emoji-card{font-size:2.5rem;display:block;margin-bottom:5px}.dashboard{width:100%;min-height:100vh;display:flex;align-items:center;justify-content:center;padding:20px}.dashboard-container{width:100%;max-width:1000px;animation:slideIn .5s ease-out}@keyframes slideIn{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}.dashboard-title{text-align:center;font-size:2.5rem;color:#333;margin-bottom:5px;text-shadow:1px 1px 2px rgba(255,255,255,.5)}.dashboard-subtitle{text-align:center;font-size:1rem;color:#555;margin-bottom:30px}.modes-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,260px));gap:20px;padding:0;justify-content:center}.mode-card{padding:20px 15px;border-radius:15px;cursor:pointer;transition:all .3s ease;box-shadow:0 10px 30px #0003;color:#fff;text-align:center}.mode-card:hover{transform:translateY(-10px);box-shadow:0 15px 40px #0000004d}.mode-card.learn{background:linear-gradient(135deg,#667eea 0%,#764ba2 100%)}.mode-card.quiz{background:linear-gradient(135deg,#f093fb 0%,#f5576c 100%)}.mode-card.words{background:linear-gradient(135deg,#4facfe 0%,#00f2fe 100%)}.mode-icon{font-size:2.8rem;margin-bottom:10px;display:inline-block;animation:bounce 2s infinite}.mode-card:nth-child(1) .mode-icon{animation-delay:0s}.mode-card:nth-child(2) .mode-icon{animation-delay:.2s}.mode-card:nth-child(3) .mode-icon{animation-delay:.4s}@keyframes bounce{0%,to{transform:translateY(0)}50%{transform:translateY(-10px)}}.mode-card h2{font-size:1.3rem;margin-bottom:5px;margin-top:0}.mode-card p{font-size:.85rem;opacity:.95;margin:0}@media (max-width: 768px){.dashboard-title{font-size:2.5rem}.dashboard-subtitle{font-size:1rem;margin-bottom:30px}.modes-grid{grid-template-columns:1fr;gap:20px}.mode-card{padding:30px 20px}.mode-icon{font-size:2.5rem}.mode-card h2{font-size:1.5rem}}.language-toggle{position:fixed;top:20px;right:20px;z-index:1000}.lang-button{padding:10px 16px;background:linear-gradient(135deg,#667eea 0%,#764ba2 100%);color:#fff;border:none;border-radius:8px;font-size:14px;font-weight:700;cursor:pointer;transition:all .3s ease;box-shadow:0 4px 15px #667eea4d}.lang-button:hover{transform:translateY(-2px);box-shadow:0 6px 20px #667eea66}@media (max-width: 600px){.language-toggle{top:10px;right:10px}.lang-button{padding:8px 12px;font-size:12px}}.app{width:100%;min-height:100vh;display:flex;align-items:center;justify-content:center;background:#f5f5f5;padding:0;margin:0;overflow-x:hidden;position:relative}@media (max-width: 1024px){.app{padding:10px}}@media (max-width: 768px){.app{padding:0}}*{transition-property:background-color,border-color,color,fill,stroke;transition-duration:.2s;transition-timing-function:ease}@media (prefers-contrast: more){button{border:2px solid currentColor}}@media (prefers-reduced-motion: reduce){*{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}}@media print{.app{background:white}button{display:none}}*{margin:0;padding:0;box-sizing:border-box}html,body,#root{width:100%;height:100%}body{font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif;background:#f5f5f5;min-height:100vh;color:#333}.app{width:100%;min-height:100vh;display:flex;align-items:center;justify-content:center;padding:20px}button{cursor:pointer;border:none;border-radius:10px;padding:12px 24px;font-size:16px;font-weight:600;transition:all .3s ease;box-shadow:0 4px 15px #0000001a}button:hover{transform:translateY(-2px);box-shadow:0 6px 20px #00000026}button:active{transform:translateY(0)}