:root{--primary-color: #3b82f6;--secondary-color: #6b7280;--background: #f9fafb;--card-background: #ffffff;--text-primary: #111827;--text-secondary: #6b7280;--border-color: #e5e7eb;--error-color: #ef4444;--success-color: #10b981;--gold-color: #fbbf24}*{box-sizing:border-box;margin:0;padding:0}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;background-color:var(--background);color:var(--text-primary)}.game-container{min-height:100vh;align-items:center;justify-content:center;padding:1rem}.game-container.quiz-playing{align-items:flex-start;padding:2rem 1rem}.game-card{background:var(--card-background);border-radius:12px;box-shadow:0 4px 6px -1px #0000001a,0 2px 4px -1px #0000000f;padding:2rem;max-width:600px;width:100%}.game-card h1{font-size:2rem;font-weight:700;margin-bottom:1.5rem;text-align:center;color:var(--text-primary)}.game-content{margin:2rem 0;text-align:center}.card-count{font-size:1rem;color:var(--text-secondary);margin-top:1rem}.game-description{font-size:1rem;color:var(--text-secondary);line-height:1.6;margin-top:1rem}.error-message{color:var(--error-color);font-size:1rem;margin:1.5rem 0;padding:1rem;background-color:#fef2f2;border-radius:8px;border:1px solid #fecaca}.game-actions{display:flex;gap:1rem;justify-content:center;margin-top:2rem}.btn{padding:.75rem 1.5rem;border-radius:8px;border:none;font-size:1rem;font-weight:600;cursor:pointer;transition:all .2s ease;min-width:120px}.btn:hover{transform:translateY(-1px);box-shadow:0 4px 6px -1px #0000001a}.btn:active{transform:translateY(0)}.btn-primary{background-color:var(--primary-color);color:#fff}.btn-primary:hover{background-color:#2563eb}.btn-secondary{background-color:var(--secondary-color);color:#fff}.btn-secondary:hover{background-color:#4b5563}.btn-back{background-color:var(--primary-color);color:#fff}.btn-back:hover{background-color:#2563eb}.quiz-header{text-align:center;margin-bottom:2rem}.round-counter{font-size:1.5rem;font-weight:700;color:var(--text-primary)}.quiz-question{text-align:center;margin-bottom:3rem}.foreign-word{font-size:3rem;font-weight:700;color:var(--primary-color);margin-bottom:1rem}.word-info{display:flex;flex-direction:column;align-items:center;gap:.75rem;margin-top:1rem}.transliteration{font-size:1.25rem;color:var(--text-secondary);font-style:italic}.tts-button{padding:.5rem 1rem;border-radius:6px;border:2px solid var(--primary-color);background-color:#fff;color:var(--primary-color);font-size:.95rem;font-weight:600;cursor:pointer;transition:all .2s ease}.tts-button:hover{background-color:var(--primary-color);color:#fff}.options-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:1rem;max-width:600px;margin:0 auto}.option-card{perspective:1000px;cursor:pointer;height:150px}.card-inner{position:relative;width:100%;height:100%;transition:transform .6s;transform-style:preserve-3d}.option-card.flipped .card-inner{transform:rotateY(180deg)}.card-front,.card-back{position:absolute;width:100%;height:100%;backface-visibility:hidden;display:flex;align-items:center;justify-content:center;border-radius:12px;padding:1rem;box-shadow:0 4px 6px -1px #0000001a,0 2px 4px -1px #0000000f}.card-front{background-color:var(--card-background);border:2px solid var(--border-color)}.card-back{background-color:var(--primary-color);color:#fff;transform:rotateY(180deg)}.card-text{font-size:1.25rem;font-weight:600;text-align:center;word-wrap:break-word}.option-card:hover .card-front{border-color:var(--primary-color);box-shadow:0 6px 8px -1px #00000026}.option-card.correct .card-back{background-color:var(--success-color)}@keyframes shake{0%,to{transform:translate(0)}10%,30%,50%,70%,90%{transform:translate(-10px)}20%,40%,60%,80%{transform:translate(10px)}}.option-card.shake{animation:shake .6s}.game-summary{max-width:800px}.summary-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:1rem;margin:2rem 0}.summary-card{background:var(--background);border-radius:8px;padding:1rem;text-align:center;border:2px solid var(--border-color)}.summary-word{font-size:1.25rem;font-weight:700;color:var(--primary-color);margin-bottom:.5rem}.summary-translation{font-size:1rem;color:var(--text-secondary);margin-bottom:.75rem}.summary-stars{font-size:1.5rem;color:var(--gold-color)}@media (max-width: 640px){.game-card{padding:1.5rem}.game-card h1{font-size:1.5rem}.foreign-word{font-size:2rem}.transliteration{font-size:1rem}.game-actions{flex-direction:column}.btn{width:100%}.options-grid{grid-template-columns:1fr;gap:.75rem}.option-card{height:120px}.card-text{font-size:1rem}.summary-grid{grid-template-columns:1fr}.round-counter{font-size:1.25rem}}body{margin:0;padding:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}code{font-family:source-code-pro,Menlo,Monaco,Consolas,Courier New,monospace}#root{min-height:100vh}