body{-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;margin:0}code{font-family:source-code-pro,Menlo,Monaco,Consolas,Courier New,monospace}.App{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;min-height:100vh;padding:20px;text-align:center}.App-header{margin:0 auto;max-width:1000px;padding:20px}h1{font-size:2.5rem;margin-bottom:30px;text-shadow:2px 2px 4px #0000004d}.controls{align-items:center;display:flex;flex-wrap:wrap;gap:20px;justify-content:space-between;margin-bottom:20px}.mode-selector{display:flex;gap:10px}.mode-selector button{background:#fff3;border:none;border-radius:8px;color:#fff;cursor:pointer;font-size:1rem;padding:10px 20px;transition:all .3s}.mode-selector button:hover{background:#ffffff4d;transform:translateY(-2px)}.mode-selector button.active{background:#fff;color:#667eea;font-weight:700}.filter-controls{align-items:center;display:flex;gap:10px}.filter-controls select{background:#ffffffe6;color:#333;padding:10px 15px}.filter-controls button,.filter-controls select{border:none;border-radius:8px;cursor:pointer;font-size:1rem}.filter-controls button{background:#fff3;color:#fff;padding:10px 20px;transition:all .3s}.filter-controls button:hover{background:#ffffff4d;transform:translateY(-2px)}.progress{font-size:1rem;margin:20px 0}.progress p{margin:5px 0}.score{align-items:center;color:#ffeb3b;display:flex;font-weight:700;gap:10px;justify-content:center}.reset-score{background:#fff3;border:none;border-radius:5px;color:#fff;cursor:pointer;font-size:.9rem;padding:5px 10px;transition:all .3s}.reset-score:hover{background:#ffffff4d}.flashcard{background:#fff;border-radius:15px;box-shadow:0 10px 30px #0000004d;color:#333;display:flex;flex-direction:column;justify-content:center;margin:30px 0;min-height:400px;padding:40px}.question h2{color:#333;font-size:1.5rem;line-height:1.6;margin-bottom:30px}.flashcard-mode{align-items:center;display:flex;flex-direction:column;justify-content:center}.reveal-btn{background:#667eea;border:none;border-radius:10px;box-shadow:0 4px 15px #667eea66;color:#fff;cursor:pointer;font-size:1.2rem;padding:15px 40px;transition:all .3s}.reveal-btn:hover{background:#5568d3;box-shadow:0 6px 20px #667eea99;transform:translateY(-2px)}.answer-section{width:100%}.option{background:#f5f5f5;border-radius:8px;margin:10px 0;padding:15px;text-align:left;transition:all .3s}.correct-option{background:#d4edda;border:2px solid #28a745;font-weight:700}.correct-answer{color:#28a745;font-size:1.2rem;font-weight:700;margin-top:20px}.quiz-mode{display:flex;flex-direction:column;gap:10px}.quiz-mode button.option{background:#f5f5f5;border:2px solid #ddd;border-radius:8px;color:#333;cursor:pointer;font-size:1rem;padding:15px;text-align:left;transition:all .3s}.quiz-mode button.option:hover:not(:disabled){background:#e9ecef;border-color:#667eea;transform:translateX(5px)}.quiz-mode button.option:disabled{cursor:not-allowed}.quiz-mode button.option.correct{background:#d4edda;border-color:#28a745;font-weight:700}.quiz-mode button.option.incorrect{background:#f8d7da;border-color:#dc3545}.navigation{display:flex;gap:20px;justify-content:center;margin-top:20px}.navigation button{-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);background:#fff3;border:none;border-radius:10px;color:#fff;cursor:pointer;font-size:1.1rem;padding:12px 30px;transition:all .3s}.navigation button:hover{background:#ffffff4d;transform:translateY(-2px)}.keyboard-hint{font-size:.9rem;margin-top:20px;opacity:.7}@media (max-width:768px){.App,.App-header{padding:10px}h1{font-size:1.5rem;margin-bottom:20px}.controls{align-items:stretch;flex-direction:column;gap:10px}.mode-selector{flex-direction:column;gap:8px}.mode-selector button{font-size:.9rem;overflow:hidden;padding:12px 16px;text-overflow:ellipsis;white-space:nowrap}.filter-controls{flex-direction:column;width:100%}.filter-controls button,.filter-controls select{font-size:.9rem;padding:12px;width:100%}.flashcard{margin:15px 0;min-height:250px;padding:15px}.question h2{font-size:1.1rem;margin-bottom:20px}.quiz-mode button.option{font-size:.9rem;padding:12px}.reveal-btn{font-size:1rem;padding:12px 30px}.navigation{gap:10px}.navigation button{font-size:.95rem;padding:10px 20px}.progress{font-size:.9rem}.keyboard-hint{font-size:.8rem}}
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