*,*:before,*:after{box-sizing:border-box}body{margin:0;padding:0;font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif;background:radial-gradient(circle,#f0f4f8,#d9e2ec);color:#333;min-height:100vh;display:flex;align-items:center;justify-content:center}.app-container{width:600px;max-width:90%;margin:40px auto;background:#fff;padding:40px;border-radius:12px;box-shadow:0 10px 25px #00000014}h1{text-align:center;margin-bottom:30px;color:#5a4fcf;font-size:2.5em}h2{text-align:center;margin-bottom:25px;color:#444}.question{font-size:1.3em;font-weight:600;margin-bottom:30px;color:#222}.option{display:block;width:100%;padding:15px 15px 15px 50px;margin:10px 0;border:2px solid #ddd;border-radius:8px;background:#fff;cursor:pointer;text-align:left;transition:all .3s ease;font-size:1em;color:#333;position:relative}.option:before{content:"";position:absolute;left:15px;top:50%;transform:translateY(-50%);width:20px;height:20px;border:2px solid #ddd;border-radius:50%;background:#fff;transition:all .3s ease}.option:hover{background:#f9f9f9;border-color:#5a4fcf}.option.selected{background:#f4f3ff;border-color:#5a4fcf;color:#5a4fcf;font-weight:600}.option.selected:before{background:#5a4fcf;border-color:#5a4fcf}.option.selected:after{content:"";position:absolute;left:22px;top:50%;transform:translateY(-50%);width:8px;height:8px;border-radius:50%;background:#fff}.btn{padding:12px 25px;border-radius:8px;cursor:pointer;font-size:1em;font-weight:600;border:none;transition:all .3s ease;text-decoration:none;display:inline-block}.btn-primary{background:#5a4fcf;color:#fff}.btn-primary:hover{background:#4a3fbf;transform:translateY(-2px);box-shadow:0 4px 10px #5a4fcf4d}.btn-primary:disabled{background:#c8c5ed;cursor:not-allowed;transform:none;box-shadow:none}.btn-secondary{background:#f4f4f4;color:#555;border:1px solid #ddd}.btn-secondary:hover{background:#e9e9e9;border-color:#ccc}.btn-secondary:disabled{background:#f9f9f9;color:#bbb;border-color:#eee;cursor:not-allowed}.nav-buttons{display:flex;justify-content:space-between;margin-top:30px;border-top:1px solid #eee;padding-top:20px}.score-display{text-align:center;margin:30px 0}.score-circle{width:150px;height:150px;border-radius:50%;background:#f4f3ff;border:5px solid #5a4fcf;display:flex;flex-direction:column;align-items:center;justify-content:center;margin:20px auto}.score-circle span:first-child{font-size:3em;font-weight:700;color:#5a4fcf;line-height:1}.score-circle span:last-child{font-size:1.1em;color:#555;margin-top:5px}.score-text{font-size:1.2em;color:#333;margin-top:20px}.restart-button{display:block;margin:30px auto 0}