@import"https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap";:root{--primary: #6366F1;--primary-light: #EEF2FF;--primary-dark: #4F46E5;--secondary: #3B82F6;--accent: #A855F7;--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%, #A855F7 100%);--gradient-hero: linear-gradient(135deg, #EEF2FF 0%, #FEFEFE 100%);--gradient-button: linear-gradient(135deg, #3B82F6 0%, #8B5CF6 50%, #A855F7 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:Inter,system-ui,-apple-system,sans-serif;line-height:1.6;font-weight:400;color:var(--text-primary);background-color:var(--surface);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:linear-gradient(135deg,var(--surface) 0%,var(--white) 100%)}#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}@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{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:var(--spacing-2xl)}.feature-card{text-align:left;padding:var(--spacing-lg)}.feature-icon{width:48px;height:48px;background-color:var(--primary-light);border-radius:var(--radius-md);display:flex;align-items:center;justify-content:center;margin-bottom:var(--spacing-md)}.feature-title{font-size:1.25rem;font-weight:600;color:var(--text-primary);margin-bottom:var(--spacing-sm)}.feature-description{color:var(--text-secondary);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" fill="url(%23grid)"/></svg>');opacity:.2}.results-hero-content{position:relative;z-index:2;display:flex;align-items:center;gap:var(--spacing-md)}.results-title{font-size:1.75rem;font-weight:600;margin-bottom:var(--spacing-xs);color:var(--white)!important}.results-subtitle{font-size:.875rem;opacity:.9;color:var(--white);display:flex;align-items:center;gap:var(--spacing-sm)}.chapter-list{display:flex;flex-direction:column;gap:var(--spacing-lg)}.chapter-item{display:flex;align-items:center;justify-content:space-between;padding:var(--spacing-lg);background:var(--white);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);transition:all .2s ease}.chapter-item:hover{box-shadow:var(--shadow-md);transform:translateY(-1px)}.chapter-info h3{font-size:1.25rem;font-weight:600;color:var(--text-primary);margin-bottom:var(--spacing-xs)}.chapter-info p{color:var(--text-muted);font-size:.875rem}@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 infinite}.nav-tabs{display:flex;align-items:center;justify-content:center;gap:var(--spacing-sm);margin-bottom:var(--spacing-xl);padding:var(--spacing-sm);background:var(--white);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);width:fit-content;margin-left:auto;margin-right:auto}.nav-tab{display:flex;align-items:center;gap:var(--spacing-xs);padding:var(--spacing-sm) var(--spacing-md);font-size:.875rem;font-weight:500;color:var(--text-muted);background:transparent;border:none;border-radius:var(--radius-md);cursor:pointer;transition:all .2s ease;white-space:nowrap}.nav-tab:hover{color:var(--text-primary);background:var(--surface-light)}.nav-tab.active{color:var(--primary);background:var(--primary-light);font-weight:600}.nav-separator{color:var(--text-muted);opacity:.5;margin:0 var(--spacing-xs)}.difficulty-badge{padding:var(--spacing-xs) 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)}.min-h-screen{min-height:100vh}.bg-surface{background:linear-gradient(135deg,var(--surface) 0%,var(--white) 100%)}.max-w-6xl{max-width:1200px}.mx-auto{margin-left:auto;margin-right:auto}.p-6{padding:var(--spacing-lg)}.p-8{padding:var(--spacing-xl)}.text-center{text-align:center}.mb-8{margin-bottom:var(--spacing-xl)}.mb-6{margin-bottom:var(--spacing-lg)}.mb-4{margin-bottom:var(--spacing-md)}.mb-3{margin-bottom:var(--spacing-sm)}.mb-2{margin-bottom:var(--spacing-xs)}.mt-4{margin-top:var(--spacing-md)}.mt-6{margin-top:var(--spacing-lg)}.mt-8{margin-top:var(--spacing-xl)}.mt-2{margin-top:var(--spacing-xs)}.mt-1{margin-top:.25rem}.mr-4{margin-right:var(--spacing-md)}.mr-1{margin-right:.25rem}.ml-4{margin-left:var(--spacing-md)}.mx-2{margin-left:var(--spacing-xs);margin-right:var(--spacing-xs)}.text-gray-800,.text-gray-700{color:var(--text-primary)}.text-gray-600{color:var(--text-secondary)}.text-gray-500,.text-gray-400{color:var(--text-muted)}.text-blue-700,.text-blue-800{color:var(--primary-dark)}.text-blue-600{color:var(--primary)}.text-green-600,.text-green-700{color:var(--success)}.text-green-800{color:#059669}.text-red-700,.text-red-500{color:var(--error)}.text-yellow-800{color:#92400e}.text-primary{color:var(--primary)}.bg-white{background-color:var(--white)}.bg-blue-100{background-color:var(--primary-light)}.bg-green-100{background-color:#ecfdf5}.bg-yellow-100{background-color:#fef3c7}.bg-red-100{background-color:#fee2e2}.bg-gray-50{background-color:var(--surface)}.bg-gray-100{background-color:var(--surface-light)}.bg-gray-200{background-color:var(--border)}.bg-primary{background-color:var(--primary)}.bg-primary-light{background-color:var(--primary-light)}.rounded-lg{border-radius:var(--radius-lg)}.rounded{border-radius:var(--radius-md)}.rounded-full{border-radius:999px}.shadow-lg{box-shadow:var(--shadow-lg)}.shadow-md{box-shadow:var(--shadow-md)}.shadow-sm{box-shadow:var(--shadow-sm)}.border{border:1px solid var(--border)}.border-2{border:2px solid var(--border)}.border-gray-200,.border-gray-300{border-color:var(--border)}.border-red-400{border-color:#fca5a5}.border-t{border-top:1px solid var(--border)}.px-3{padding-left:var(--spacing-sm);padding-right:var(--spacing-sm)}.px-4{padding-left:var(--spacing-md);padding-right:var(--spacing-md)}.px-6{padding-left:var(--spacing-lg);padding-right:var(--spacing-lg)}.px-2{padding-left:var(--spacing-xs);padding-right:var(--spacing-xs)}.py-1,.py-2{padding-top:var(--spacing-xs);padding-bottom:var(--spacing-xs)}.py-3{padding-top:var(--spacing-sm);padding-bottom:var(--spacing-sm)}.py-12{padding-top:3rem;padding-bottom:3rem}.p-4{padding:var(--spacing-md)}.p-2{padding:var(--spacing-xs)}.pl-10{padding-left:2.5rem}.pl-3{padding-left:var(--spacing-sm)}.flex{display:flex}.flex-1{flex:1}.flex-shrink-0{flex-shrink:0}.items-center{align-items:center}.items-start{align-items:flex-start}.justify-center{justify-content:center}.justify-between{justify-content:space-between}.gap-2{gap:var(--spacing-xs)}.gap-3{gap:var(--spacing-sm)}.gap-4{gap:var(--spacing-md)}.gap-1{gap:.25rem}.w-4{width:1rem}.w-5{width:1.25rem}.w-6{width:1.5rem}.w-8{width:2rem}.w-10{width:2.5rem}.w-16{width:4rem}.w-full{width:100%}.h-2{height:.5rem}.h-4{height:1rem}.h-5{height:1.25rem}.h-6{height:1.5rem}.h-8{height:2rem}.h-10{height:2.5rem}.h-16{height:4rem}.min-w-0{min-width:0}.text-4xl{font-size:2.25rem;font-weight:700;line-height:1.1}.text-3xl{font-size:1.875rem;font-weight:700;line-height:1.2}.text-2xl{font-size:1.5rem;font-weight:600;line-height:1.3}.text-xl{font-size:1.25rem;font-weight:600;line-height:1.4}.text-lg{font-size:1.125rem;line-height:1.6}.text-sm{font-size:.875rem;line-height:1.5}.text-xs{font-size:.75rem;line-height:1.4}.font-bold{font-weight:700}.font-semibold{font-weight:600}.font-medium{font-weight:500}.leading-relaxed{line-height:1.625}.truncate{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.relative{position:relative}.absolute{position:absolute}.inset-y-0{top:0;bottom:0}.left-0{left:0}.float-right{float:right}.hidden{display:none}.inline-flex{display:inline-flex}.space-y-4>*+*{margin-top:var(--spacing-md)}.space-y-3>*+*{margin-top:var(--spacing-sm)}.space-y-8>*+*{margin-top:var(--spacing-xl)}.hover\:text-gray-700:hover,.hover\:text-gray-800:hover{color:var(--text-primary)}.hover\:text-red-500:hover,.hover\:text-red-700:hover{color:var(--error)}.hover\:text-blue-800:hover,.hover\:text-primary-dark:hover{color:var(--primary-dark)}.hover\:bg-gray-100:hover{background-color:var(--surface-light)}.group:hover .group-hover\:opacity-100{opacity:1}.transition-all{transition:all .2s ease}.transition-colors{transition:color .2s ease,background-color .2s ease,border-color .2s ease}.duration-300{transition-duration:.3s}.cursor-pointer{cursor:pointer}.pointer-events-none{pointer-events:none}.opacity-0{opacity:0}.animate-spin{animation:spin 1s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}@media (max-width: 640px){.text-4xl{font-size:2rem}.text-3xl{font-size:1.75rem}.text-2xl{font-size:1.5rem}.px-6{padding-left:var(--spacing-md);padding-right:var(--spacing-md)}.p-6{padding:var(--spacing-md)}.p-8{padding:var(--spacing-lg)}}