:root{font-family: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;place-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:#fff}a:hover{color:#747bff}button{background-color:#f9f9f9}}body{font-family:Roboto,sans-serif;margin:0;padding:0;background-color:#f0f2f5;color:#333;display:flex;justify-content:center;align-items:center;min-height:100vh}.app{width:100%;max-width:650px;padding:30px;background:#fff;border-radius:15px;box-shadow:0 15px 40px #00000026;text-align:center;display:flex;flex-direction:column;gap:20px;animation:fadeIn .5s ease-in-out}h1{font-size:2rem;margin-bottom:10px;color:#4caf50}h2{font-size:1.5rem;margin-bottom:15px}.option{display:block;width:100%;margin:10px 0;padding:15px 20px;font-size:16px;cursor:pointer;border:2px solid #4caf50;border-radius:10px;background-color:#fff;color:#333;transition:all .3s ease;text-align:left}.option:hover{background-color:#e8f5e9;transform:scale(1.02)}.option.selected{background-color:#4caf50;color:#fff;border-color:#4caf50}.btn{padding:12px 30px;margin:10px 5px;cursor:pointer;border:none;background-color:#4caf50;color:#fff;font-size:16px;border-radius:10px;transition:all .3s ease}.btn:hover{background-color:#45a049;transform:scale(1.05)}.btn:disabled{background-color:#a5d6a7;cursor:not-allowed}.progress-container{height:12px;background:#e0e0e0;border-radius:6px;margin:15px 0;overflow:hidden}.progress-bar{height:100%;background:#4caf50;width:0%;border-radius:6px;transition:width .3s ease}.summary{text-align:left;margin-top:20px}.summary p{margin:8px 0;padding:10px;border-radius:8px}.correct{background-color:#e8f5e9;color:#2e7d32}.incorrect{background-color:#ffebee;color:#c62828}@keyframes fadeIn{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}@media (max-width: 700px){.app{padding:20px}h1{font-size:1.7rem}h2{font-size:1.3rem}.option{font-size:15px;padding:12px 15px}.btn{font-size:15px;padding:10px 20px}}