:root{font-family:Inter,system-ui,Avenir,Helvetica,Arial,sans-serif;line-height:1.5;font-weight:400;color-scheme:light dark;color:#ffffffde;background-color:#242424;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}a{font-weight:500;color:#646cff;text-decoration:inherit}a:hover{color:#535bf2}body{margin:0;display:flex;justify-content:center;align-items:center;min-width:320px;min-height:100vh}h1{font-size:3.2em;line-height:1.1}button{border-radius:8px;border:1px solid transparent;padding:.6em 1.2em;font-size:1em;font-weight:500;font-family:inherit;background-color:#1a1a1a;cursor:pointer;transition:border-color .25s}button:hover{border-color:#646cff}button:focus,button:focus-visible{outline:4px auto -webkit-focus-ring-color}@media (prefers-color-scheme: light){:root{color:#213547;background-color:}a:hover{color:#747bff}button{background-color:#f9f9f9}}*{margin:0;padding:0;box-sizing:border-box}.app{min-height:100vh;background:#1a1a1a;color:#fff;display:grid;place-items:center;padding:20px}.content-wrapper{width:100%;max-width:600px;background:#2d2d2d;padding:2rem;border-radius:16px;text-align:center}.progress-bar{height:6px;background:#333;border-radius:3px;margin:1rem 0}.progress-fill{height:100%;background:#58cc02;border-radius:3px;transition:width .3s ease}.question-box{background:#333;padding:2rem;border-radius:12px;margin:2rem 0}.answer-section input{width:100%;padding:1rem;margin:1rem 0;background:#404040;border:2px solid #404040;color:#fff;border-radius:8px;font-size:1rem}.controls{display:grid;gap:1rem;margin:2rem 0}button{padding:1rem;border:none;border-radius:8px;background:#58cc02;color:#fff;font-weight:700;cursor:pointer}button:disabled{background:#404040;cursor:not-allowed}.report-button{background:#3b82f6;width:100%}.feedback{padding:1rem;margin:1rem 0;border-radius:8px}.feedback.correct{background:#1a2a1a;color:#58cc02}.feedback.incorrect{background:#2a1a1a;color:#ff4b4b}.progress{color:#888;margin-top:1rem}