*{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:linear-gradient(135deg,#667eea 0%,#764ba2 100%);min-height:100vh;padding:20px}.app{max-width:1200px;margin:0 auto}.header{background:white;padding:30px;border-radius:15px;box-shadow:0 10px 30px #0000001a;margin-bottom:30px;text-align:center}.header h1{color:#333;margin-bottom:10px;font-size:2.5rem}.header p{color:#666;font-size:1.1rem}.quiz-setup{background:white;padding:40px;border-radius:15px;box-shadow:0 10px 30px #0000001a;text-align:center}.quiz-setup h2{color:#333;margin-bottom:30px;font-size:2rem}.setup-options{display:flex;flex-direction:column;gap:20px;max-width:500px;margin:0 auto}.option-group{text-align:left}.option-group label{display:block;margin-bottom:10px;font-weight:600;color:#555;font-size:1.1rem}.option-group input,.option-group select{width:100%;padding:15px;border:2px solid #ddd;border-radius:8px;font-size:1rem;transition:border-color .3s}.option-group input:focus,.option-group select:focus{outline:none;border-color:#667eea}.btn-primary{background:linear-gradient(135deg,#667eea 0%,#764ba2 100%);color:#fff;border:none;padding:18px 40px;font-size:1.2rem;font-weight:600;border-radius:10px;cursor:pointer;transition:transform .2s,box-shadow .2s;margin-top:20px}.btn-primary:hover{transform:translateY(-2px);box-shadow:0 5px 20px #667eea66}.btn-primary:disabled{background:#ccc;cursor:not-allowed;transform:none}.quiz-container{background:white;padding:40px;border-radius:15px;box-shadow:0 10px 30px #0000001a}.quiz-progress{margin-bottom:30px;padding-bottom:20px;border-bottom:2px solid #eee}.progress-bar{background:#eee;height:10px;border-radius:5px;overflow:hidden;margin-bottom:10px}.progress-fill{background:linear-gradient(135deg,#667eea 0%,#764ba2 100%);height:100%;transition:width 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#0000001a}.options-list{list-style:none;margin-bottom:30px}.option-item{background:#f8f9fa;margin-bottom:15px;padding:20px;border-radius:10px;cursor:pointer;transition:all .3s;border:2px solid transparent}.option-item:hover{background:#e9ecef;transform:translate(5px)}.option-item.selected{background:#e7f3ff;border-color:#667eea}.option-item.correct{background:#d4edda;border-color:#28a745}.option-item.incorrect{background:#f8d7da;border-color:#dc3545}.option-item.disabled{cursor:not-allowed;opacity:.7}.option-label{font-weight:600;color:#667eea;margin-right:10px}.option-text{color:#333}.quiz-actions{display:flex;gap:15px;justify-content:space-between;flex-wrap:wrap}.btn-secondary{background:#6c757d;color:#fff;border:none;padding:12px 25px;font-size:1rem;font-weight:600;border-radius:8px;cursor:pointer;transition:background .3s}.btn-secondary:hover{background:#5a6268}.btn-success{background:#28a745;color:#fff;border:none;padding:12px 25px;font-size:1rem;font-weight:600;border-radius:8px;cursor:pointer;transition:background .3s}.btn-success:hover{background:#218838}.hint-section{background:#fff3cd;padding:20px;border-radius:10px;margin-top:20px;border-left:4px solid #ffc107}.hint-section h4{color:#856404;margin-bottom:10px}.hint-section p{color:#856404;line-height:1.6}.results-container{background:white;padding:40px;border-radius:15px;box-shadow:0 10px 30px #0000001a;text-align:center}.results-container h2{color:#333;margin-bottom:30px;font-size:2.5rem}.score-display{font-size:4rem;font-weight:700;background:linear-gradient(135deg,#667eea 0%,#764ba2 100%);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;margin:30px 0}.results-stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:20px;margin:30px 0}.stat-card{background:#f8f9fa;padding:20px;border-radius:10px}.stat-card h3{color:#666;font-size:.9rem;margin-bottom:10px}.stat-card p{font-size:2rem;font-weight:700;color:#333}.btn-restart{background:linear-gradient(135deg,#667eea 0%,#764ba2 100%);color:#fff;border:none;padding:15px 40px;font-size:1.1rem;font-weight:600;border-radius:10px;cursor:pointer;margin-top:20px}.error-message{background:#f8d7da;color:#721c24;padding:20px;border-radius:10px;margin:20px 0;border-left:4px solid #dc3545}.loading{text-align:center;padding:40px;font-size:1.2rem;color:#666}@media (max-width: 768px){.header h1{font-size:2rem}.quiz-setup,.quiz-container,.results-container{padding:20px}.question-text{font-size:1.1rem}.score-display{font-size:3rem}}