*{box-sizing:border-box;margin:0;padding:0}:root{--primary-color:#6366f1;--primary-dark:#4f46e5;--primary-light:#818cf8;--secondary-color:#8b5cf6;--success-color:#10b981;--warning-color:#f59e0b;--danger-color:#ef4444;--info-color:#3b82f6;--bg-primary:#0f172a;--bg-secondary:#1e293b;--bg-tertiary:#334155;--text-primary:#f1f5f9;--text-secondary:#cbd5e1;--text-muted:#94a3b8;--spacing-xs:0.25rem;--spacing-sm:0.5rem;--spacing-md:1rem;--spacing-lg:1.5rem;--spacing-xl:2rem;--spacing-2xl:3rem;--radius-sm:0.375rem;--radius-md:0.5rem;--radius-lg:0.75rem;--radius-xl:1rem;--radius-full:9999px;--shadow-sm:0 1px 2px 0 #0000000d;--shadow-md:0 4px 6px -1px #0000001a;--shadow-lg:0 10px 15px -3px #0000001a;--shadow-xl:0 20px 25px -5px #0000001a;--transition-fast:150ms ease-in-out;--transition-normal:300ms ease-in-out;--transition-slow:500ms 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(max-width:640px){.timer-container{min-width:150px;padding:var(--spacing-sm) var(--spacing-md)}.timer-value{font-size:1.25rem}}.answered-count{background:#ffffff0d;border-radius:var(--radius-md);color:var(--text-secondary);font-size:.938rem;font-weight:600;padding:var(--spacing-sm) var(--spacing-md)}.nav-button{min-width:140px}.quiz-navigation{-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);background:#1e293b99;border:1px solid #ffffff1a;border-radius:var(--radius-xl);gap:var(--spacing-lg);justify-content:space-between;margin-top:var(--spacing-xl);padding:var(--spacing-xl)}.navigation-info,.quiz-navigation{align-items:center;display:flex;flex-wrap:wrap}.navigation-info{gap:var(--spacing-md)}.answered-count,.unanswered-count{align-items:center;border-radius:var(--radius-md);display:flex;font-size:.938rem;font-weight:600;gap:var(--spacing-xs);padding:var(--spacing-sm) var(--spacing-md)}.answered-count{background:#10b9811a;border:1px solid #10b98133;color:var(--success-color)}.unanswered-count{background:#f59e0b1a;border:1px solid #f59e0b33;color:var(--warning-color)}.navigation-buttons{display:flex;flex-wrap:wrap;gap:var(--spacing-md)}.nav-button{min-width:120px}.skip-button{background:#f59e0b1a;border:2px solid #f59e0b4d;color:var(--warning-color)}.skip-button:hover:not(.disabled){background:#f59e0b33;border-color:#f59e0b80;transform:translateY(-2px)}.skip-submit-button{background:#f59e0b26;border:2px solid #f59e0b66;color:var(--warning-color)}.skip-submit-button:hover:not(.disabled){background:#f59e0b40;border-color:#f59e0b99}.submit-button{background:linear-gradient(135deg,var(--success-color),#059669);box-shadow:0 4px 15px #10b98166}.submit-button:hover:not(.disabled){box-shadow:0 6px 20px #10b98199}.next-button{background:linear-gradient(135deg,var(--primary-color),var(--secondary-color))}.prev-button{background:#ffffff1a;border:1px solid #fff3}.modal-overlay{align-items:center;animation:fadeIn .3s ease;-webkit-backdrop-filter:blur(5px);backdrop-filter:blur(5px);background:#000000b3;bottom:0;display:flex;justify-content:center;left:0;padding:var(--spacing-md);position:fixed;right:0;top:0;z-index:1000}.modal-content{animation:slideUp .3s ease;background:var(--bg-secondary);border:1px solid #ffffff1a;border-radius:var(--radius-xl);box-shadow:var(--shadow-xl);max-width:500px;width:100%}@keyframes slideUp{0%{opacity:0;transform:translateY(50px)}to{opacity:1;transform:translateY(0)}}.modal-header{align-items:center;border-bottom:1px solid #ffffff1a;display:flex;justify-content:space-between;padding:var(--spacing-xl)}.modal-header h3{color:var(--text-primary);font-size:1.5rem;margin:0}.modal-close{align-items:center;background:none;border:none;border-radius:var(--radius-md);color:var(--text-secondary);cursor:pointer;display:flex;font-size:2rem;height:40px;justify-content:center;transition:all var(--transition-fast);width:40px}.modal-close:hover{background:#ffffff1a;color:var(--text-primary)}.modal-body{padding:var(--spacing-xl)}.modal-stats{grid-gap:var(--spacing-md);display:grid;gap:var(--spacing-md);grid-template-columns:repeat(2,1fr);margin-bottom:var(--spacing-lg)}.modal-stat{align-items:center;border-radius:var(--radius-lg);display:flex;flex-direction:column;gap:var(--spacing-sm);padding:var(--spacing-lg)}.modal-stat.success{background:#10b9811a;border:1px solid #10b9814d}.modal-stat.warning{background:#f59e0b1a;border:1px solid #f59e0b4d}.modal-stat .stat-icon{font-size:2rem}.modal-stat.success .stat-icon{color:var(--success-color)}.modal-stat.warning .stat-icon{color:var(--warning-color)}.modal-stat .stat-number{color:var(--text-primary);font-size:2rem;font-weight:700}.modal-stat .stat-label{color:var(--text-secondary);font-size:.875rem;letter-spacing:.5px;text-transform:uppercase}.modal-body p{color:var(--text-secondary);line-height:1.6;margin-bottom:var(--spacing-md)}.modal-body p:last-child{margin-bottom:0}.warning-text{background:#f59e0b1a;border:1px solid #f59e0b4d;border-radius:var(--radius-md);color:var(--warning-color);font-weight:600;margin-top:var(--spacing-md);padding:var(--spacing-md)}.confirm-text{color:var(--text-primary)!important;font-size:1rem;font-weight:600}.modal-actions{border-top:1px solid #ffffff1a;display:flex;gap:var(--spacing-md);padding:var(--spacing-xl)}.modal-actions .btn{flex:1 1}@media (max-width:640px){.quiz-navigation{align-items:stretch;flex-direction:column;gap:var(--spacing-md)}.navigation-info{justify-content:center;width:100%}.navigation-buttons{flex-direction:column;width:100%}.nav-button{width:100%}.modal-stats{grid-template-columns:1fr}.quiz-navigation{align-items:stretch;flex-direction:column}.navigation-info{justify-content:center}.navigation-buttons{flex-direction:column;width:100%}.nav-button{width:100%}}.quiz-question{margin:0 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#6366f166;color:#fff;display:flex;font-size:1.25rem;font-weight:700;height:50px;justify-content:center;width:50px}.difficulty-badge{border-radius:var(--radius-full);font-size:.75rem;font-weight:600;letter-spacing:.5px;padding:var(--spacing-xs) var(--spacing-md);text-transform:uppercase}.difficulty-badge.easy{background:#10b98133;border:1px solid #10b9814d;color:var(--success-color)}.difficulty-badge.medium{background:#f59e0b33;border:1px solid #f59e0b4d;color:var(--warning-color)}.difficulty-badge.hard{background:#ef444433;border:1px solid #ef44444d;color:var(--danger-color)}.category-badge{background:#3b82f633;border:1px solid #3b82f64d;border-radius:var(--radius-full);color:var(--info-color);font-size:.75rem;font-weight:600;padding:var(--spacing-xs) var(--spacing-md)}.question-text{color:var(--text-primary);font-size:1.5rem;font-weight:600;line-height:1.6;margin-bottom:var(--spacing-2xl)}.clear-answer-button{align-items:center;background:#ef44441a;border:1px solid #ef44444d;border-radius:var(--radius-md);color:var(--danger-color);cursor:pointer;display:flex;font-family:inherit;font-size:.875rem;font-weight:600;gap:var(--spacing-xs);margin-left:auto;padding:var(--spacing-xs) var(--spacing-md);transition:all var(--transition-fast)}.clear-answer-button:hover{background:#ef444433;border-color:#ef444480;transform:translateY(-1px)}.clear-answer-button:active{transform:translateY(0)}.clear-icon{align-items:center;display:flex;font-size:1.5rem;font-weight:700;justify-content:center;line-height:1}.clear-text{font-size:.875rem}.answer-status{font-size:.938rem}.answer-status.answered{background:#10b9811a;border:1px solid #10b9814d}.answer-status.unanswered{background:#f59e0b1a;border:1px solid #f59e0b4d}.answer-status.answered .status-icon{color:var(--success-color)}.answer-status.unanswered .status-icon{color:var(--warning-color)}.answer-status.answered .status-text{color:var(--success-color);font-weight:600}.answer-status.unanswered 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