@import"https://fonts.googleapis.com/css2?family=Poppins:wght@400;500;600;700&display=swap";:root{--primary: #3B82F6;--primary-light: #DBEAFE;--primary-dark: #2563EB;--secondary: #10B981;--accent: #06B6D4;--success: #10B981;--warning: #F59E0B;--error: #EF4444;--white: #ffffff;--surface: #F8F9FB;--surface-light: #F3F4F6;--border: #E5E7EB;--text-primary: #111827;--text-secondary: #6B7280;--text-muted: #9CA3AF;--gradient-primary: linear-gradient(135deg, #3B82F6 0%, #10B981 100%);--gradient-hero: linear-gradient(135deg, #F3F4F6 0%, #FFFFFF 100%);--gradient-button: linear-gradient(135deg, #3B82F6 0%, #06B6D4 50%, #10B981 100%);--spacing-xs: .25rem;--spacing-sm: .5rem;--spacing-md: 1rem;--spacing-lg: 1.5rem;--spacing-xl: 2rem;--spacing-2xl: 3rem;--radius-sm: 6px;--radius-md: 8px;--radius-lg: 12px;--radius-xl: 16px;--shadow-sm: 0 1px 2px 0 rgb(0 0 0 / .05);--shadow-md: 0 4px 6px -1px rgb(0 0 0 / .1), 0 2px 4px -2px rgb(0 0 0 / .1);--shadow-lg: 0 10px 15px -3px rgb(0 0 0 / .1), 0 4px 6px -4px rgb(0 0 0 / .1);--shadow-xl: 0 20px 25px -5px rgb(0 0 0 / .1), 0 8px 10px -6px rgb(0 0 0 / .1);font-family:Poppins,system-ui,-apple-system,sans-serif;line-height:1.6;font-weight:400;color:var(--text-primary);background-color:var(--white);font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}*{box-sizing:border-box}body{margin:0;min-width:320px;min-height:100vh;background:var(--white)}#root{width:100%;margin:0;padding:0}h1{font-size:2.5rem;font-weight:700;line-height:1.2;color:var(--text-primary);margin:0 0 var(--spacing-md)}h2{font-size:2rem;font-weight:600;line-height:1.3;color:var(--text-primary);margin:0 0 var(--spacing-md)}h3{font-size:1.5rem;font-weight:600;line-height:1.4;color:var(--text-primary);margin:0 0 var(--spacing-sm)}h4{font-size:1.25rem;font-weight:500;line-height:1.4;color:var(--text-primary);margin:0 0 var(--spacing-sm)}p{font-size:1rem;line-height:1.6;color:var(--text-secondary);margin:0 0 var(--spacing-md)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:var(--spacing-xs);padding:var(--spacing-sm) var(--spacing-md);font-family:inherit;font-size:.875rem;font-weight:500;line-height:1.5;border:1px solid transparent;border-radius:var(--radius-md);cursor:pointer;transition:all .2s ease;white-space:nowrap;text-decoration:none;outline:none}.btn:focus-visible{outline:2px solid var(--primary);outline-offset:2px}.btn:disabled{opacity:.6;cursor:not-allowed}.btn-primary{background-color:var(--primary);color:var(--white);border-color:var(--primary)}.btn-primary:hover:not(:disabled){background-color:var(--primary-dark);border-color:var(--primary-dark);transform:translateY(-1px);box-shadow:var(--shadow-md)}.btn-secondary{background-color:var(--white);color:var(--text-primary);border-color:var(--border)}.btn-secondary:hover:not(:disabled){background-color:var(--surface);border-color:var(--primary);color:var(--primary)}.btn-success{background-color:var(--success);color:var(--white);border-color:var(--success)}.btn-success:hover:not(:disabled){background-color:#059669;border-color:#059669;transform:translateY(-1px);box-shadow:var(--shadow-md)}.btn-warning{background-color:var(--warning);color:var(--white);border-color:var(--warning)}.btn-warning:hover:not(:disabled){background-color:#d97706;border-color:#d97706;transform:translateY(-1px);box-shadow:var(--shadow-md)}.btn-danger{background-color:var(--error);color:var(--white);border-color:var(--error)}.btn-danger:hover:not(:disabled){background-color:#dc2626;border-color:#dc2626;transform:translateY(-1px);box-shadow:var(--shadow-md)}.btn-sm{padding:var(--spacing-xs) var(--spacing-sm);font-size:.75rem}.btn-lg{padding:var(--spacing-md) var(--spacing-lg);font-size:1rem}.card{background-color:var(--white);border:1px solid var(--border);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);transition:all .2s ease}.card:hover{box-shadow:var(--shadow-md);transform:translateY(-2px)}.card-interactive{cursor:pointer}.card-interactive:hover{border-color:var(--primary);box-shadow:var(--shadow-lg);transform:translateY(-4px)}.container{width:100%;max-width:1200px;margin:0 auto;padding:0 var(--spacing-md)}.grid{display:grid;gap:var(--spacing-md)}.grid-cols-1{grid-template-columns:repeat(1,minmax(0,1fr))}.grid-cols-2{grid-template-columns:repeat(2,minmax(0,1fr))}.grid-cols-3{grid-template-columns:repeat(3,minmax(0,1fr))}.flex-col{flex-direction:column}.gap-sm{gap:var(--spacing-sm)}.gap-md{gap:var(--spacing-md)}.gap-lg{gap:var(--spacing-lg)}.p-sm{padding:var(--spacing-sm)}.p-md{padding:var(--spacing-md)}.p-lg{padding:var(--spacing-lg)}.p-xl{padding:var(--spacing-xl)}.px-sm{padding-left:var(--spacing-sm);padding-right:var(--spacing-sm)}.px-md{padding-left:var(--spacing-md);padding-right:var(--spacing-md)}.px-lg{padding-left:var(--spacing-lg);padding-right:var(--spacing-lg)}.py-sm{padding-top:var(--spacing-sm);padding-bottom:var(--spacing-sm)}.py-md{padding-top:var(--spacing-md);padding-bottom:var(--spacing-md)}.py-lg{padding-top:var(--spacing-lg);padding-bottom:var(--spacing-lg)}.m-sm{margin:var(--spacing-sm)}.m-md{margin:var(--spacing-md)}.m-lg{margin:var(--spacing-lg)}.mb-sm{margin-bottom:var(--spacing-sm)}.mb-md{margin-bottom:var(--spacing-md)}.mb-lg{margin-bottom:var(--spacing-lg)}.mt-sm{margin-top:var(--spacing-sm)}.mt-md{margin-top:var(--spacing-md)}.mt-lg{margin-top:var(--spacing-lg)}.alert{padding:var(--spacing-md);border-radius:var(--radius-md);border:1px solid;margin-bottom:var(--spacing-md)}.alert-error{background-color:#fef2f2;border-color:#fecaca;color:#991b1b}.alert-success{background-color:#ecfdf5;border-color:#bbf7d0;color:#166534}.alert-warning{background-color:#fffbeb;border-color:#fed7aa;color:#92400e}.input{display:block;width:100%;padding:var(--spacing-sm) var(--spacing-md);font-size:.875rem;line-height:1.5;color:var(--text-primary);background-color:var(--white);border:1px solid var(--border);border-radius:var(--radius-md);transition:border-color .2s ease,box-shadow .2s ease}.input:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px #6366f11a}.input::placeholder{color:var(--text-muted)}.progress{width:100%;height:8px;background-color:var(--border);border-radius:999px;overflow:hidden}.progress-bar{height:100%;background:var(--gradient-button);border-radius:999px;transition:width .3s ease}.upload-progress-container{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:var(--spacing-md)}.circular-progress{width:120px;height:120px;transform:rotate(-90deg)}.circular-progress-bg{fill:none;stroke:#e5e7eb;stroke-width:8}.circular-progress-bar{fill:none;stroke:var(--primary);stroke-width:8;stroke-linecap:round;transition:stroke-dashoffset .3s ease}.circular-progress-text{font-size:24px;font-weight:600;fill:var(--text-primary);transform:rotate(90deg);transform-origin:center}.upload-status-text{font-size:1rem;color:var(--text-secondary);font-weight:500;margin:0}.cancel-upload-button{padding:var(--spacing-sm) var(--spacing-lg);background:#fff;color:var(--text-secondary);border:none;border-radius:var(--radius-lg);font-size:.875rem;font-weight:500;cursor:pointer;transition:all .2s ease;box-shadow:var(--shadow-sm)}.cancel-upload-button:hover{box-shadow:var(--shadow-md);color:var(--text-primary)}@media(min-width:640px){.container{padding:0 var(--spacing-lg)}.sm\\:grid-cols-2{grid-template-columns:repeat(2,minmax(0,1fr))}.sm\\:grid-cols-3{grid-template-columns:repeat(3,minmax(0,1fr))}h1{font-size:3rem}h2{font-size:2.25rem}}@media(min-width:768px){.container{padding:0 var(--spacing-xl)}.md\\:grid-cols-2{grid-template-columns:repeat(2,minmax(0,1fr))}.md\\:grid-cols-3{grid-template-columns:repeat(3,minmax(0,1fr))}.md\\:grid-cols-4{grid-template-columns:repeat(4,minmax(0,1fr))}}@media(min-width:1024px){.lg\\:grid-cols-3{grid-template-columns:repeat(3,minmax(0,1fr))}.lg\\:grid-cols-4{grid-template-columns:repeat(4,minmax(0,1fr))}}.hero-section-new{text-align:center;padding:var(--spacing-2xl) 0;max-width:900px;margin:0 auto var(--spacing-sm)}.hero-title-new{font-size:40px;font-weight:700;color:var(--text-primary);margin-bottom:var(--spacing-md);line-height:1.2;letter-spacing:-.02em}.hero-subtitle-new{font-size:1.125rem;color:var(--text-secondary);margin-bottom:var(--spacing-2xl);line-height:1.6;font-weight:400}.upload-dropzone{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:var(--spacing-2xl) var(--spacing-xl);border:3px dashed #93C5FD;border-radius:var(--radius-xl);background:#eff6ff;transition:all .3s ease;margin:0 auto var(--spacing-lg);max-width:700px;min-height:280px}.upload-dropzone.clickable:hover{border-color:var(--primary);background:#dbeafe;transform:translateY(-2px);box-shadow:0 4px 20px #3b82f626}.upload-dropzone.dragging{border-color:var(--secondary);background:#d1fae5;transform:scale(1.02);box-shadow:0 8px 30px #10b98140}.upload-dropzone.uploading{border-color:#93c5fd;background:#e0edff;box-shadow:inset 0 8px 30px #3b82f61f}.upload-icon-container{margin-bottom:var(--spacing-md)}.upload-dropzone-text{font-size:1rem;color:var(--text-secondary);font-weight:500;margin:0}.hero-section{background:var(--gradient-hero);border-radius:var(--radius-xl);padding:var(--spacing-2xl) var(--spacing-xl);text-align:center;position:relative;overflow:hidden;margin-bottom:var(--spacing-xl)}.hero-content{max-width:700px;margin:0 auto;position:relative;z-index:2}.hero-title{font-size:2.5rem;font-weight:700;background:var(--gradient-primary);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;margin-bottom:var(--spacing-md);line-height:1.2}.hero-subtitle{font-size:1.125rem;color:var(--primary);margin-bottom:var(--spacing-xl);line-height:1.6}.hero-button{background:var(--gradient-button);color:var(--white);padding:var(--spacing-md) var(--spacing-xl);border-radius:var(--radius-lg);font-weight:600;font-size:1rem;border:none;cursor:pointer;transition:all .3s ease;display:inline-flex;align-items:center;gap:var(--spacing-sm);box-shadow:0 4px 14px #6366f166}.hero-button:hover{transform:translateY(-2px);box-shadow:0 6px 20px #6366f180}.hero-button:disabled{opacity:.6;cursor:not-allowed;transform:none}.features-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:var(--spacing-xl);margin-top:0}.feature-card{text-align:left;padding:23px 18px;border:none;border-radius:20px;box-shadow:0 2px 8px #00000014;background-color:var(--white)}.feature-header{display:flex;align-items:center;gap:var(--spacing-sm);margin-bottom:var(--spacing-sm)}.feature-icon{width:48px;height:48px;display:flex;align-items:center;justify-content:center;flex-shrink:0}.feature-icon img{filter:grayscale(100%) brightness(.5);opacity:.6}.feature-title{font-size:1.25rem;font-weight:500;color:#6b6b6b;margin:0}.feature-description{font-size:.8125rem;font-weight:400;color:#6b6b6b;line-height:1.6}.app-header{display:flex;justify-content:space-between;align-items:center;padding:var(--spacing-lg) 0;margin-bottom:var(--spacing-xl)}.logo{display:flex;align-items:center;gap:var(--spacing-sm);font-size:1.5rem;font-weight:700;color:var(--text-primary)}.quiz-question-card{background:var(--white);border-radius:var(--radius-lg);padding:var(--spacing-xl);margin-bottom:var(--spacing-lg);box-shadow:var(--shadow-sm)}.quiz-options{display:flex;flex-direction:column;gap:var(--spacing-md);margin-top:var(--spacing-lg)}.quiz-option{display:flex;align-items:center;padding:var(--spacing-md);border:2px solid var(--border);border-radius:var(--radius-md);cursor:pointer;transition:all .2s ease}.quiz-option:hover{border-color:var(--primary);background-color:var(--primary-light)}.quiz-option input[type=radio]{margin-right:var(--spacing-md)}.results-hero{background:var(--gradient-primary);border-radius:var(--radius-xl);padding:var(--spacing-2xl);color:var(--white);margin-bottom:var(--spacing-xl);position:relative;overflow:hidden}.results-hero:before{content:"";position:absolute;top:0;left:0;right:0;bottom:0;background:url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grid" width="10" height="10" patternUnits="userSpaceOnUse"><path d="M 10 0 L 0 0 0 10" fill="none" stroke="rgba(255,255,255,0.1)" stroke-width="1"/></pattern></defs><rect width="100" height="100" 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thead{background-color:var(--surface-light);border-bottom:1px solid var(--border)}.chapters-table th{padding:var(--spacing-md) var(--spacing-lg);text-align:left;font-size:.875rem;font-weight:600;color:var(--text-secondary);text-transform:capitalize}.chapters-table tbody tr{border-bottom:1px solid var(--border);transition:background-color .2s ease}.chapters-table tbody tr:hover{background-color:var(--surface)}.chapters-table tbody tr:last-child{border-bottom:none}.chapters-table td{padding:var(--spacing-lg);font-size:.875rem;vertical-align:middle}.chapters-table td:last-child{text-align:right}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.animate-fade-in{animation:fadeIn .3s ease}.loading{opacity:.7;pointer-events:none}.loading:after{content:"";position:absolute;top:50%;left:50%;width:20px;height:20px;margin:-10px 0 0 -10px;border:2px solid var(--border);border-top-color:var(--primary);border-radius:50%;animation:spin 1s linear 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var(--spacing-sm);border-radius:999px;font-size:.75rem;font-weight:600;text-transform:capitalize}.difficulty-badge.basic{background:#ecfdf5;color:var(--success)}.difficulty-badge.intermediate{background:#fef3c7;color:var(--warning)}.difficulty-badge.advanced{background:#dbeafe;color:var(--secondary)}details summary{list-style:none;cursor:pointer;-webkit-user-select:none;user-select:none}details summary::-webkit-details-marker{display:none}details[open] summary span:first-child{transform:rotate(90deg)}details summary span:first-child{display:inline-block;transition:transform .2s ease}.metadata-icon{width:1rem;height:1rem;color:var(--text-muted)}:root{--react-pdf-annotation-layer: 1;--annotation-unfocused-field-background: url("data:image/svg+xml;charset=UTF-8,<svg width='1px' height='1px' xmlns='http://www.w3.org/2000/svg'><rect width='100%' height='100%' style='fill:rgba(0, 54, 255, 0.13);'/></svg>");--input-focus-border-color: Highlight;--input-focus-outline: 1px solid 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