:root{font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif;line-height:1.5;font-weight:400}*{box-sizing:border-box}body{margin:0;min-width:320px;min-height:100vh}button{font-family:inherit}*{box-sizing:border-box;margin:0;padding:0}body{font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif;background:linear-gradient(135deg,#667eea,#764ba2);min-height:100vh;color:#333}#root{min-height:100vh}.app{min-height:100vh;display:flex;justify-content:center;align-items:flex-start;padding:20px}.main-screen,.training-screen,.errors-screen{background:#fff;border-radius:20px;padding:30px;box-shadow:0 10px 40px #0003;max-width:500px;width:100%;margin-top:20px}.title{font-size:2.5rem;color:#667eea;text-align:center;margin-bottom:5px}.subtitle{font-size:1.5rem;color:#764ba2;text-align:center;margin-bottom:30px}.instruction{font-size:1.1rem;color:#666;text-align:center;margin-bottom:20px}.folders{display:flex;flex-direction:column;gap:12px}.folder-btn{padding:16px 24px;font-size:1rem;background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;border:none;border-radius:12px;cursor:pointer;transition:all .3s ease;box-shadow:0 4px 15px #667eea66}.folder-btn:hover{transform:translateY(-2px);box-shadow:0 6px 20px #667eea80}.folder-btn:active{transform:translateY(0);box-shadow:0 2px 10px #667eea66}.history-btn{display:block;margin:30px auto 0;padding:12px 30px;font-size:1rem;background:#f0f0f0;color:#667eea;border:2px solid #667eea;border-radius:12px;cursor:pointer;transition:all .3s ease}.history-btn:hover{background:#667eea;color:#fff}.training-header{text-align:center;margin-bottom:25px}.training-header h2{color:#667eea;font-size:1.3rem;margin-bottom:10px}.progress{font-size:1.1rem;color:#666;margin-bottom:5px}.stats{font-size:.95rem;color:#888}.correct-count{color:#4caf50;font-weight:700}.incorrect-count{color:#f44336;font-weight:700}.question-container{background:#f8f9ff;border-radius:15px;padding:25px;margin-bottom:20px}.question{font-size:1.4rem;text-align:center;color:#333;margin-bottom:15px;line-height:1.4}.answer-placeholder{min-height:50px;display:flex;align-items:center;justify-content:center;margin-bottom:20px}.correct-answer{font-size:1.3rem;font-weight:700;padding:10px 20px;border-radius:10px}.correct-answer.success{background:#e8f5e9;color:#4caf50}.correct-answer.error{background:#ffebee;color:#f44336}.options{display:grid;grid-template-columns:repeat(2,1fr);gap:12px;margin-bottom:15px}.option-btn{padding:15px;font-size:1.2rem;font-weight:700;background:#fff;color:#667eea;border:2px solid #667eea;border-radius:12px;cursor:pointer;transition:all .3s ease;box-shadow:0 3px 10px #0000001a}.option-btn:hover:not(:disabled){background:#667eea;color:#fff;transform:translateY(-2px)}.option-btn:active:not(:disabled){transform:translateY(0)}.option-btn:disabled{cursor:default}.option-btn.correct{background:#4caf50;color:#fff;border-color:#4caf50;animation:pulse .5s ease}.option-btn.wrong{background:#f44336;color:#fff;border-color:#f44336;animation:shake .5s ease}@keyframes pulse{0%,to{transform:scale(1)}50%{transform:scale(1.05)}}@keyframes shake{0%,to{transform:translate(0)}25%{transform:translate(-5px)}75%{transform:translate(5px)}}.next-btn-container{min-height:55px;display:flex;justify-content:center;align-items:center}.next-btn{padding:14px 30px;font-size:1.1rem;background:linear-gradient(135deg,#4caf50,#45a049);color:#fff;border:none;border-radius:12px;cursor:pointer;transition:all .3s ease;box-shadow:0 4px 15px #4caf5066}.next-btn:hover{transform:translateY(-2px);box-shadow:0 6px 20px #4caf5080}.bottom-buttons{display:flex;gap:10px;flex-wrap:wrap;justify-content:center}.action-btn{padding:12px 20px;font-size:.95rem;background:#f5f5f5;color:#666;border:1px solid #ddd;border-radius:10px;cursor:pointer;transition:all .3s ease}.action-btn:hover{background:#e0e0e0;transform:translateY(-1px)}.action-btn.primary{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;border:none}.action-btn.primary:hover{box-shadow:0 4px 15px #667eea66}.errors-screen h2{color:#667eea;text-align:center;margin-bottom:10px}.errors-screen h3{color:#764ba2;text-align:center;font-size:1.1rem;margin-bottom:20px}.stats-box{background:#f8f9ff;border-radius:15px;padding:20px;margin-bottom:20px}.stats-box p{margin-bottom:8px;font-size:1rem}.mistakes-list{background:#fff5f5;border-radius:15px;padding:20px;margin-bottom:20px}.mistakes-list h4{color:#f44336;margin-bottom:15px}.mistake-item{padding:8px 12px;background:#fff;border-radius:8px;margin-bottom:8px;border-left:3px solid #f44336}.train-mistakes-btn{display:block;width:100%;margin-top:15px;padding:14px;font-size:1rem;background:linear-gradient(135deg,#ff6b6b,#f44336);color:#fff;border:none;border-radius:12px;cursor:pointer;transition:all .3s ease;box-shadow:0 4px 15px #f4433666}.train-mistakes-btn:hover{transform:translateY(-2px);box-shadow:0 6px 20px #f4433680}.previous-errors{margin-bottom:20px}.previous-errors h4{color:#888;margin-bottom:15px}.history-item{background:#f5f5f5;border-radius:10px;padding:15px;margin-bottom:10px}.history-item.faded{opacity:.6}.history-item p{margin-bottom:5px;font-size:.95rem}.old-mistakes{font-size:.85rem;color:#888;margin-top:8px}.modal-overlay{position:fixed;inset:0;background:#00000080;display:flex;justify-content:center;align-items:center;z-index:1000;padding:20px}.modal{background:#fff;border-radius:20px;padding:30px;max-width:450px;width:100%;max-height:80vh;overflow-y:auto;box-shadow:0 10px 40px #0000004d}.modal h2{color:#667eea;text-align:center;margin-bottom:20px}.history-list{margin-bottom:20px}.close-btn{display:block;width:100%;padding:14px;font-size:1rem;background:#f0f0f0;color:#666;border:none;border-radius:12px;cursor:pointer;transition:all .3s ease}.close-btn:hover{background:#e0e0e0}@media(max-width:480px){.main-screen,.training-screen,.errors-screen{padding:20px}.title{font-size:2rem}.subtitle,.question{font-size:1.2rem}.options{grid-template-columns:repeat(2,1fr)}.option-btn{padding:12px;font-size:1rem}}