.app{min-height:100vh;display:flex;flex-direction:column}.main-content{flex:1;width:100%}.app:before{content:"";position:fixed;top:0;left:0;right:0;bottom:0;background:radial-gradient(circle at 20% 80%,hsla(260,85%,58%,.15) 0%,transparent 50%),radial-gradient(circle at 80% 20%,hsla(190,85%,58%,.15) 0%,transparent 50%),radial-gradient(circle at 40% 40%,hsla(280,75%,65%,.1) 0%,transparent 50%);pointer-events:none;z-index:-1}.header{position:sticky;top:0;z-index:100;background:var(--glass-bg);-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);border-bottom:1px solid var(--glass-border);box-shadow:var(--shadow-md)}.header-container{max-width:1400px;margin:0 auto;padding:var(--spacing-md) var(--spacing-lg);display:flex;align-items:center;justify-content:space-between;gap:var(--spacing-xl)}.logo{display:flex;align-items:center;gap:var(--spacing-md);cursor:pointer;transition:all .3s ease}.logo:hover{transform:scale(1.05)}.logo-icon{font-size:2rem;background:linear-gradient(135deg,var(--color-primary),var(--color-accent));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;font-weight:700}.logo-text{font-size:1.5rem;font-weight:700;background:linear-gradient(135deg,var(--color-primary-light),var(--color-accent));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.nav{display:flex;gap:var(--spacing-sm);flex-wrap:wrap}.nav-item{display:flex;align-items:center;gap:var(--spacing-sm);padding:var(--spacing-sm) var(--spacing-md);background:transparent;border:2px solid transparent;border-radius:var(--radius-lg);color:var(--text-secondary);font-family:var(--font-sans);font-size:.95rem;font-weight:500;cursor:pointer;transition:all .3s cubic-bezier(.4,0,.2,1);position:relative;overflow:hidden}.nav-item:before{content:"";position:absolute;top:0;left:0;right:0;bottom:0;background:linear-gradient(135deg,var(--color-primary),var(--color-secondary));opacity:0;transition:opacity .3s ease;z-index:-1}.nav-item:hover{color:var(--text-primary);border-color:var(--color-primary)}.nav-item:hover:before{opacity:.1}.nav-item.active{color:#fff;border-color:var(--color-primary);background:linear-gradient(135deg,var(--color-primary),var(--color-secondary));box-shadow:var(--shadow-glow)}.nav-icon{font-size:1.2rem}.nav-label{white-space:nowrap}@media (max-width: 968px){.header-container{flex-direction:column;gap:var(--spacing-md)}.nav{width:100%;justify-content:center}.nav-item{flex:1;justify-content:center;min-width:120px}}@media (max-width: 640px){.nav-label{display:none}.nav-item{min-width:auto;padding:var(--spacing-sm)}.nav-icon{font-size:1.5rem}}.home-page{width:100%}.hero{padding:var(--spacing-3xl) 0;text-align:center;position:relative;overflow:hidden}.hero-content{position:relative;z-index:1}.hero-title{font-size:3.5rem;margin-bottom:var(--spacing-lg);line-height:1.1}.highlight{position:relative;display:inline-block;color:var(--text-primary);background:none;-webkit-text-fill-color:var(--text-primary)}.highlight:after{content:"";position:absolute;bottom:0;left:0;right:0;height:12px;background:linear-gradient(90deg,var(--color-primary),var(--color-accent));opacity:.3;border-radius:var(--radius-sm);z-index:-1}.hero-subtitle{font-size:1.25rem;color:var(--text-secondary);margin-bottom:var(--spacing-2xl);max-width:600px;margin-left:auto;margin-right:auto}.hero-stats{display:flex;gap:var(--spacing-2xl);justify-content:center;flex-wrap:wrap;margin-top:var(--spacing-2xl)}.stat{text-align:center;padding:var(--spacing-lg);background:var(--glass-bg);border:1px solid var(--glass-border);border-radius:var(--radius-xl);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);min-width:120px}.stat-number{font-size:3rem;font-weight:800;background:linear-gradient(135deg,var(--color-primary),var(--color-accent));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;margin-bottom:var(--spacing-xs)}.stat-label{font-size:.9rem;color:var(--text-muted);text-transform:uppercase;letter-spacing:1px}.modules-section{background:linear-gradient(180deg,transparent 0%,hsla(240,20%,12%,.5) 50%,transparent 100%)}.section-title{text-align:center;font-size:2.5rem;margin-bottom:var(--spacing-md)}.section-subtitle{text-align:center;font-size:1.1rem;color:var(--text-secondary);margin-bottom:var(--spacing-2xl)}.modules-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:var(--spacing-xl);margin-top:var(--spacing-2xl)}.module-card{display:flex;flex-direction:column;padding:var(--spacing-2xl);cursor:pointer;transition:all .3s ease;position:relative;overflow:hidden}.module-card:before{content:"";position:absolute;top:0;left:0;right:0;height:4px;background:linear-gradient(90deg,var(--color-primary),var(--color-accent));transform:scaleX(0);transform-origin:left;transition:transform .3s ease}.module-card:hover:before{transform:scaleX(1)}.module-icon{font-size:4rem;margin-bottom:var(--spacing-lg);width:80px;height:80px;display:flex;align-items:center;justify-content:center;background:var(--bg-secondary);border-radius:var(--radius-xl);box-shadow:var(--shadow-lg);-webkit-text-fill-color:initial}.module-title{font-size:1.5rem;margin-bottom:var(--spacing-md)}.module-description{color:var(--text-secondary);margin-bottom:var(--spacing-lg);flex-grow:1}.module-topics{list-style:none;margin-bottom:var(--spacing-lg);padding:var(--spacing-md);background:var(--bg-secondary);border-radius:var(--radius-md)}.module-topics li{color:var(--text-secondary);padding:var(--spacing-xs) 0;display:flex;align-items:center;gap:var(--spacing-sm)}.topic-bullet{color:var(--color-primary);font-weight:700;font-size:1.2rem}.module-btn{width:100%;justify-content:center}.features-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:var(--spacing-xl);margin-top:var(--spacing-2xl)}.feature-card{text-align:center;padding:var(--spacing-xl)}.feature-icon{font-size:3rem;margin-bottom:var(--spacing-md);background:none;-webkit-text-fill-color:initial}.feature-card h3{font-size:1.25rem;margin-bottom:var(--spacing-md)}.feature-card p{color:var(--text-secondary);font-size:.95rem;line-height:1.6}@media (max-width: 768px){.hero-title{font-size:2.5rem}.hero-subtitle{font-size:1.1rem}.hero-stats{gap:var(--spacing-lg)}.modules-grid{grid-template-columns:1fr}}.primitives-page{padding:var(--spacing-2xl) 0}.page-header{text-align:center;margin-bottom:var(--spacing-3xl)}.page-header h1{font-size:3rem;margin-bottom:var(--spacing-md)}.page-intro{font-size:1.2rem;color:var(--text-secondary);max-width:800px;margin:0 auto}.section-nav{display:flex;gap:var(--spacing-md);margin-bottom:var(--spacing-2xl);overflow-x:auto;padding:var(--spacing-md);background:var(--glass-bg);border-radius:var(--radius-xl);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.section-nav-btn{flex:1;min-width:150px;padding:var(--spacing-md) var(--spacing-lg);background:var(--bg-secondary);border:2px solid transparent;border-radius:var(--radius-lg);color:var(--text-secondary);font-family:var(--font-sans);font-size:.95rem;font-weight:600;cursor:pointer;transition:all .3s ease;white-space:nowrap}.section-nav-btn:hover{background:var(--bg-tertiary);color:var(--text-primary);border-color:var(--color-primary)}.section-nav-btn.active{background:linear-gradient(135deg,var(--color-primary),var(--color-secondary));color:#fff;border-color:var(--color-primary);box-shadow:var(--shadow-glow)}.content-section{animation:fadeIn .5s ease}.content-section h2{font-size:2rem;margin-bottom:var(--spacing-xl)}.content-section h3{font-size:1.5rem;margin-bottom:var(--spacing-md)}.concept-card{background:linear-gradient(135deg,#7639ef0d,#39d1ef0d);margin-bottom:var(--spacing-xl)}.example-card{margin-bottom:var(--spacing-xl)}.info-card{background:linear-gradient(135deg,#39d1ef0d,#bc63e90d);margin-bottom:var(--spacing-xl)}.note{background:var(--bg-secondary);border-left:4px solid var(--color-accent);padding:var(--spacing-md);border-radius:var(--radius-md);margin:var(--spacing-lg) 0}.small-note{font-size:.9rem;color:var(--text-muted);font-style:italic;margin-top:var(--spacing-md)}.step{display:flex;gap:var(--spacing-md);margin:var(--spacing-lg) 0;padding:var(--spacing-md);background:var(--bg-secondary);border-radius:var(--radius-md);transition:all .3s ease}.step:hover{background:var(--bg-tertiary);transform:translate(5px)}.step-number{flex-shrink:0;width:36px;height:36px;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,var(--color-primary),var(--color-secondary));color:#fff;border-radius:50%;font-weight:700;font-size:1.1rem}.step-content{flex:1}.step-content p{margin-bottom:var(--spacing-sm)}.result-box{background:linear-gradient(135deg,#3cdd711a,#3cdd710d);border:2px solid var(--color-success);border-radius:var(--radius-lg);padding:var(--spacing-lg);margin-top:var(--spacing-lg)}.theorem-box{background:var(--bg-secondary);border:2px solid var(--color-primary);border-radius:var(--radius-lg);padding:var(--spacing-lg);margin:var(--spacing-lg) 0}.theorem-box strong{color:var(--color-primary-light);font-size:1.1rem}.two-columns{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:var(--spacing-lg);margin:var(--spacing-xl) 0}.success-card{border-left:4px solid var(--color-success)}.warning-card{border-left:4px solid var(--color-warning)}.visual-explanation{background:var(--bg-tertiary);border-radius:var(--radius-md);padding:var(--spacing-lg);margin-top:var(--spacing-lg)}.notation-breakdown{margin:var(--spacing-xl) 0}.notation-parts{display:flex;flex-direction:column;gap:var(--spacing-lg)}.notation-part{display:flex;gap:var(--spacing-xl);align-items:center;padding:var(--spacing-lg);background:var(--bg-secondary);border-radius:var(--radius-lg)}.notation-part .symbol{flex-shrink:0;width:80px;height:80px;display:flex;align-items:center;justify-content:center;background:var(--bg-tertiary);border-radius:var(--radius-lg);font-size:2rem}.notation-part .explanation{flex:1}.notation-part .explanation strong{display:block;color:var(--color-primary-light);margin-bottom:var(--spacing-xs)}.vocab-table{width:100%;border-collapse:collapse;margin:var(--spacing-lg) 0}.vocab-table th,.vocab-table td{padding:var(--spacing-md);text-align:left;border-bottom:1px solid var(--glass-border)}.vocab-table th{background:var(--bg-tertiary);color:var(--color-primary-light);font-weight:600}.vocab-table tr:hover{background:var(--bg-secondary)}.examples-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:var(--spacing-md);margin-top:var(--spacing-lg)}.mini-card{background:var(--bg-secondary);border:1px solid var(--glass-border);border-radius:var(--radius-md);padding:var(--spacing-md);transition:all .3s ease}.mini-card:hover{background:var(--bg-tertiary);border-color:var(--color-primary);transform:translateY(-2px)}.formulas-table table{width:100%;border-collapse:collapse;margin:var(--spacing-lg) 0}.formulas-table th,.formulas-table td{padding:var(--spacing-md);text-align:center;border-bottom:1px solid var(--glass-border)}.formulas-table th{background:var(--bg-tertiary);color:var(--color-primary-light);font-weight:600}.formulas-table tr:hover{background:var(--bg-secondary)}.solution-steps{margin:var(--spacing-lg) 0}.solution-content{margin-top:var(--spacing-md);padding:var(--spacing-md);background:var(--bg-secondary);border-radius:var(--radius-md)}.quiz-input{display:flex;flex-direction:column;gap:var(--spacing-md);margin:var(--spacing-lg) 0}.quiz-input label{display:flex;flex-direction:column;gap:var(--spacing-sm);color:var(--text-secondary);font-weight:500}details.reveal-answer{margin-top:var(--spacing-lg);background:var(--bg-secondary);border-radius:var(--radius-lg);padding:var(--spacing-lg);cursor:pointer}details.reveal-answer summary{font-weight:600;color:var(--color-primary-light);cursor:pointer;-webkit-user-select:none;user-select:none;list-style:none}details.reveal-answer summary::-webkit-details-marker{display:none}details.reveal-answer summary:before{content:"▶ ";display:inline-block;transition:transform .3s ease}details.reveal-answer[open] summary:before{transform:rotate(90deg)}.answer-content{margin-top:var(--spacing-lg);padding-top:var(--spacing-lg);border-top:1px solid var(--glass-border)}@media (max-width: 768px){.page-header h1{font-size:2rem}.section-nav{flex-direction:column}.section-nav-btn{min-width:100%}.notation-part{flex-direction:column;text-align:center}.two-columns{grid-template-columns:1fr}.formulas-table{overflow-x:auto}}.math-block{margin:var(--spacing-lg) 0;padding:var(--spacing-xl);background:var(--bg-secondary);border:1px solid var(--glass-border);border-radius:var(--radius-lg);overflow-x:auto;text-align:center}.math-inline{display:inline-block;margin:0 var(--spacing-xs);padding:2px 6px;background:#ffffff08;border-radius:var(--radius-sm)}.math-block .katex,.math-inline .katex{font-size:1.15em;color:var(--text-primary)}.math-block .katex-display{margin:0;text-align:center}.katex{color:var(--text-primary)!important}.katex *{color:inherit}.calcul-integral-page{padding:var(--spacing-2xl) 0}.historical-note{background:var(--bg-tertiary);border-left:4px solid var(--color-accent);border-radius:var(--radius-md);padding:var(--spacing-lg);margin:var(--spacing-lg) 0}.historical-note h4{color:var(--color-accent-light);margin-bottom:var(--spacing-sm);font-size:1.1rem}.visualization-area{margin:var(--spacing-xl) 0}.visualization-container{background:var(--bg-secondary);border-radius:var(--radius-lg);padding:var(--spacing-xl);display:flex;flex-direction:column;align-items:center;gap:var(--spacing-lg)}.visualization-canvas{max-width:100%;height:auto;border-radius:var(--radius-md);background:var(--bg-tertiary)}.visualization-controls{width:100%;max-width:500px}.visualization-controls label{display:flex;flex-direction:column;gap:var(--spacing-sm);color:var(--text-secondary);font-weight:500}.slider{width:100%;height:8px;border-radius:var(--radius-lg);background:var(--bg-tertiary);outline:none;-webkit-appearance:none;-moz-appearance:none;appearance:none}.slider::-webkit-slider-thumb{-webkit-appearance:none;-moz-appearance:none;appearance:none;width:20px;height:20px;border-radius:50%;background:linear-gradient(135deg,var(--color-primary),var(--color-accent));cursor:pointer;box-shadow:var(--shadow-md);transition:all .3s ease}.slider::-webkit-slider-thumb:hover{transform:scale(1.2);box-shadow:var(--shadow-glow)}.slider::-moz-range-thumb{width:20px;height:20px;border-radius:50%;background:linear-gradient(135deg,var(--color-primary),var(--color-accent));cursor:pointer;border:none;box-shadow:var(--shadow-md);transition:all .3s ease}.slider::-moz-range-thumb:hover{transform:scale(1.2);box-shadow:var(--shadow-glow)}.notation-details{background:var(--bg-tertiary);border-radius:var(--radius-md);padding:var(--spacing-lg);margin-top:var(--spacing-lg)}.notation-details h4{color:var(--color-primary-light);margin-bottom:var(--spacing-md)}.notation-details ul{list-style:none;padding:0}.notation-details li{padding:var(--spacing-sm) 0;color:var(--text-secondary)}.theorem-card{background:linear-gradient(135deg,#7639ef14,#bc63e914);border:2px solid var(--color-primary);margin:var(--spacing-xl) 0}.properties-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:var(--spacing-lg);margin:var(--spacing-xl) 0}.property-card{position:relative;padding-top:var(--spacing-2xl);border:2px solid var(--glass-border);transition:all .3s ease}.property-card:hover{border-color:var(--color-primary);transform:translateY(-4px);box-shadow:var(--shadow-xl)}.property-number{position:absolute;top:-15px;left:var(--spacing-lg);width:40px;height:40px;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,var(--color-primary),var(--color-secondary));color:#fff;border-radius:50%;font-weight:700;font-size:1.2rem;box-shadow:var(--shadow-md)}.property-card h3{font-size:1.2rem;margin-bottom:var(--spacing-md);color:var(--color-primary-light)}.step-explanation{margin:var(--spacing-lg) 0}@media (max-width: 768px){.visualization-canvas{width:100%}.properties-grid{grid-template-columns:1fr}}.applications-page{padding:var(--spacing-2xl) 0}.warning-card{background:linear-gradient(135deg,#f5b83d0d,#e64c4c0d);border-left:4px solid var(--color-warning);margin:var(--spacing-xl) 0}.warning-note{background:var(--bg-secondary);border-left:4px solid var(--color-warning);padding:var(--spacing-md);border-radius:var(--radius-md);margin:var(--spacing-lg) 0}.examples-selector{margin:var(--spacing-xl) 0}.example-tabs{display:flex;gap:var(--spacing-sm);margin-bottom:var(--spacing-lg);border-bottom:2px solid var(--glass-border)}.example-tab{padding:var(--spacing-md) var(--spacing-xl);background:transparent;border:none;border-bottom:3px solid transparent;color:var(--text-secondary);font-family:var(--font-sans);font-size:1rem;font-weight:600;cursor:pointer;transition:all .3s ease;position:relative}.example-tab:hover{color:var(--text-primary);background:var(--bg-secondary)}.example-tab.active{color:var(--color-primary-light);border-bottom-color:var(--color-primary)}.example-content{animation:fadeIn .4s ease}.example-box{background:var(--glass-bg);border:1px solid var(--glass-border);border-radius:var(--radius-xl);padding:var(--spacing-xl);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.example-box h4{color:var(--color-primary-light);margin-bottom:var(--spacing-md)}.calculator-box{background:var(--bg-secondary);border:2px solid var(--glass-border);border-radius:var(--radius-xl);padding:var(--spacing-xl)}.calculator-inputs{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:var(--spacing-lg);margin:var(--spacing-lg) 0}.input-group{display:flex;flex-direction:column;gap:var(--spacing-sm)}.input-group label{color:var(--text-secondary);font-weight:500;font-size:.95rem}@media (max-width: 768px){.example-tabs{flex-direction:column}.example-tab{text-align:left;border-bottom:none;border-left:3px solid transparent}.example-tab.active{border-bottom-color:transparent;border-left-color:var(--color-primary)}.calculator-inputs{grid-template-columns:1fr}}.integration-parties-page{padding:var(--spacing-2xl) 0}.method-card{background:linear-gradient(135deg,#7639ef0d,#39d1ef0d);margin:var(--spacing-xl) 0}.method-steps{margin-top:var(--spacing-lg)}.method-step{background:var(--bg-secondary);border-left:4px solid var(--color-primary);border-radius:var(--radius-md);padding:var(--spacing-lg);margin-bottom:var(--spacing-lg);display:flex;gap:var(--spacing-lg);transition:all .3s ease}.method-step:hover{background:var(--bg-tertiary);transform:translate(5px)}.method-step h4{color:var(--color-primary-light);font-size:1.1rem;margin-bottom:var(--spacing-sm)}.helper-table table{width:100%;border-collapse:collapse;margin:var(--spacing-lg) 0}.helper-table th,.helper-table td{padding:var(--spacing-md);text-align:left;border-bottom:1px solid var(--glass-border)}.helper-table th{background:var(--bg-tertiary);color:var(--color-primary-light);font-weight:600}.helper-table tr:hover{background:var(--bg-secondary)}.subsection-title{color:var(--color-accent-light);font-size:1.2rem;margin:var(--spacing-lg) 0 var(--spacing-md) 0;padding-bottom:var(--spacing-sm);border-bottom:2px solid var(--color-accent)}.exercise-card{background:linear-gradient(135deg,#3cdd710d,#39d1ef0d);border-left:4px solid var(--color-success);margin-bottom:var(--spacing-xl)}.exercise-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:var(--spacing-md);flex-wrap:wrap;gap:var(--spacing-md)}.difficulty-badge{padding:var(--spacing-xs) var(--spacing-md);border-radius:var(--radius-md);font-size:.85rem;font-weight:600;text-transform:uppercase;letter-spacing:.5px}.difficulty-badge.easy{background:#3cdd7133;color:var(--color-success);border:1px solid var(--color-success)}.difficulty-badge.medium{background:#f5b83d33;color:var(--color-warning);border:1px solid var(--color-warning)}.difficulty-badge.hard{background:#e64c4c33;color:var(--color-error);border:1px solid var(--color-error)}.exercise-actions{display:flex;gap:var(--spacing-md);margin-top:var(--spacing-md);flex-wrap:wrap}.hint-box{background:#f5b83d1a;border:2px solid var(--color-warning);border-radius:var(--radius-md);padding:var(--spacing-lg);animation:fadeIn .3s ease}.solution-box{background:#3cdd711a;border:2px solid var(--color-success);border-radius:var(--radius-md);padding:var(--spacing-lg);animation:fadeIn .3s ease}.solution-box ul{list-style:none;padding:0}.solution-box li{padding:var(--spacing-xs) 0;color:var(--text-secondary)}@media (max-width: 768px){.method-step{flex-direction:column}.exercise-header{flex-direction:column;align-items:flex-start}.exercise-actions{width:100%;flex-direction:column}.exercise-actions button{width:100%}.helper-table{overflow-x:auto}}:root{--color-primary: hsl(260, 85%, 58%);--color-primary-light: hsl(260, 85%, 68%);--color-primary-dark: hsl(260, 85%, 48%);--color-secondary: hsl(280, 75%, 65%);--color-accent: hsl(190, 85%, 58%);--color-accent-light: hsl(190, 85%, 68%);--bg-primary: hsl(240, 20%, 8%);--bg-secondary: hsl(240, 18%, 12%);--bg-tertiary: hsl(240, 16%, 16%);--bg-elevated: hsl(240, 20%, 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