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p{color:#64748b;margin-bottom:2rem}.no-data{color:#94a3b8;font-style:italic;padding:1rem;text-align:center}@media(max-width:768px){.analytics-header{flex-direction:column;align-items:flex-start;gap:1rem}.category-header{flex-direction:column;align-items:flex-start}.category-visualization{width:100%}.progress-timeline{grid-template-columns:repeat(auto-fill,minmax(100px,1fr))}.view-toggle{width:100%}.toggle-btn{flex:1}}*{margin:0;padding:0;box-sizing:border-box}:root{--primary: #2563eb;--primary-dark: #1e40af;--primary-light: #3b82f6;--success: #10b981;--warning: #f59e0b;--danger: #ef4444;--danger-dark: #dc2626;--gray-50: #f9fafb;--gray-100: #f3f4f6;--gray-200: #e5e7eb;--gray-300: #d1d5db;--gray-400: #9ca3af;--gray-500: #6b7280;--gray-600: #4b5563;--gray-700: #374151;--gray-800: #1f2937;--gray-900: #111827;--spacing-xs: .25rem;--spacing-sm: .5rem;--spacing-md: 1rem;--spacing-lg: 1.5rem;--spacing-xl: 2rem;--spacing-2xl: 3rem;--radius-sm: .25rem;--radius-md: .5rem;--radius-lg: .75rem;--shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, .05);--shadow-md: 0 4px 6px -1px rgba(0, 0, 0, .1);--shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, .1)}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:var(--gray-50);color:var(--gray-900);line-height:1.6}code,pre{font-family:Courier New,monospace}.container{max-width:1200px;margin:0 auto;padding:0 var(--spacing-lg)}.loading{display:flex;justify-content:center;align-items:center;min-height:100vh;font-size:1.25rem;color:var(--gray-600)}.navbar{background:#fff;border-bottom:1px solid var(--gray-200);padding:var(--spacing-md) var(--spacing-lg);display:flex;justify-content:space-between;align-items:center;box-shadow:var(--shadow-sm)}.navbar h1{font-size:1.5rem;color:var(--primary)}.navbar div{display:flex;gap:var(--spacing-md);align-items:center}.navbar span{color:var(--gray-700)}.navbar a{color:var(--primary);text-decoration:none;padding:var(--spacing-sm) var(--spacing-md)}.navbar a:hover{background:var(--gray-100);border-radius:var(--radius-md)}button,.btn{padding:var(--spacing-sm) var(--spacing-lg);border:none;border-radius:var(--radius-md);font-size:1rem;font-weight:500;cursor:pointer;transition:all .2s;display:inline-flex;align-items:center;gap:var(--spacing-sm)}button:disabled{opacity:.5;cursor:not-allowed}.btn-primary{background:var(--primary);color:#fff}.btn-primary:hover:not(:disabled){background:var(--primary-dark);box-shadow:var(--shadow-md)}.btn-success{background:var(--success);color:#fff}.btn-danger{background:var(--danger);color:#fff}.btn-danger:hover:not(:disabled){background:var(--danger-dark)}.btn-secondary{background:var(--gray-200);color:var(--gray-800)}.btn-secondary:hover:not(:disabled){background:var(--gray-300)}.form-container{max-width:400px;margin:2rem auto;padding:var(--spacing-2xl);background:#fff;border-radius:var(--radius-lg);box-shadow:var(--shadow-lg)}.form-group{margin-bottom:var(--spacing-lg)}.form-group label{display:block;margin-bottom:var(--spacing-sm);font-weight:500;color:var(--gray-700)}.form-group input{width:100%;padding:var(--spacing-sm) var(--spacing-md);border:1px solid var(--gray-300);border-radius:var(--radius-md);font-size:1rem}.form-group input:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px #2563eb1a}.error{color:var(--danger);font-size:.875rem;margin-top:var(--spacing-sm)}.exam-timer{font-size:1.25rem;font-weight:600;padding:var(--spacing-md);background:#fff;border-radius:var(--radius-md);box-shadow:var(--shadow-sm)}.exam-timer.low{background:#fef3c7;color:#92400e}.exam-timer.critical{background:#fee2e2;color:#991b1b;animation:pulse 1s infinite}@keyframes pulse{0%,to{opacity:1}50%{opacity:.8}}.timer-label{font-size:.875rem;font-weight:400;margin-right:var(--spacing-sm)}.question-view{background:#fff;padding:var(--spacing-2xl);border-radius:var(--radius-lg);box-shadow:var(--shadow-md);max-width:100%;overflow-x:auto}.question-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:var(--spacing-xl)}.question-header-actions{display:flex;gap:var(--spacing-md);align-items:center}.flag-btn{background:transparent;border:1px solid var(--gray-300);padding:var(--spacing-sm) var(--spacing-md)}.flag-btn.flagged{background:var(--warning);color:#fff;border-color:var(--warning)}.question-text{font-size:1.125rem;line-height:1.8;margin-bottom:var(--spacing-lg);color:var(--gray-800)}.question-images{margin:var(--spacing-lg) 0;display:flex;gap:var(--spacing-md);flex-wrap:wrap}.question-images img{max-width:100%;height:auto;border-radius:var(--radius-md);border:1px solid var(--gray-200)}.question-table-container{margin:var(--spacing-lg) 0;overflow-x:auto}.question-table{width:100%;border-collapse:collapse}.question-table th,.question-table td{padding:var(--spacing-sm) var(--spacing-md);border:1px solid var(--gray-300);text-align:left}.question-table th{background:var(--gray-100);font-weight:600}.options{display:flex;flex-direction:column;gap:var(--spacing-md);margin-top:var(--spacing-xl)}.option{display:flex;align-items:start;padding:var(--spacing-md);border:2px solid var(--gray-200);border-radius:var(--radius-md);cursor:pointer;transition:all .2s}.option:hover{border-color:var(--primary-light);background:var(--gray-50)}.option.selected{border-color:var(--primary);background:#2563eb0d}.option input[type=radio]{margin-right:var(--spacing-md);cursor:pointer}.option-label{font-weight:600;margin-right:var(--spacing-sm);color:var(--gray-700)}.option-text{flex:1}.question-nav{background:#fff;padding:var(--spacing-lg);border-radius:var(--radius-md);box-shadow:var(--shadow-sm)}.question-nav h3{margin-bottom:var(--spacing-md);color:var(--gray-700)}.nav-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:.375rem}.nav-btn{padding:.5rem;border:1px solid var(--gray-300);background:#fff;border-radius:var(--radius-sm);font-size:.875rem;cursor:pointer;transition:all .2s;position:relative}.nav-btn:hover{border-color:var(--primary);background:var(--gray-50)}.nav-btn.current{background:var(--primary);color:#fff;border-color:var(--primary)}.nav-btn.answered{background:var(--success);color:#fff;border-color:var(--success)}.nav-btn.flagged:after{content:"🚩";position:absolute;top:-8px;right:-8px;font-size:.75rem}.exam-page{padding:var(--spacing-lg);min-height:100vh}.exam-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:var(--spacing-lg);gap:var(--spacing-md);flex-wrap:wrap}.exam-content{display:grid;grid-template-columns:180px 1fr;gap:var(--spacing-xl);margin-bottom:var(--spacing-lg);align-items:start}.exam-nav-buttons{display:flex;justify-content:flex-end;gap:var(--spacing-md)}.nav-buttons-right{display:flex;gap:var(--spacing-md)}.exam-results{max-width:600px;margin:2rem auto;padding:var(--spacing-2xl);background:#fff;border-radius:var(--radius-lg);box-shadow:var(--shadow-lg);text-align:center}.exam-results h1{color:var(--success);margin-bottom:var(--spacing-xl)}.score{font-size:3rem;font-weight:700;color:var(--primary);margin:var(--spacing-xl) 0}@media(max-width:768px){.exam-content{grid-template-columns:1fr}.nav-grid{grid-template-columns:repeat(10,1fr)}.navbar{flex-direction:column;gap:var(--spacing-md)}}