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.nav-module-icon{background:var(--primary);color:#fff;border-radius:var(--radius)}.nav-module-info{flex:1;min-width:0}.nav-module-title{font-size:var(--text-sm);font-weight:600;color:var(--text-primary);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.nav-module-meta{font-size:var(--text-xs);color:var(--text-muted)}.nav-module-arrow{font-size:var(--text-sm);color:var(--text-muted);transition:transform var(--transition-fast)}.nav-module.expanded .nav-module-arrow{transform:rotate(90deg)}.nav-sections{margin-left:var(--space-6);margin-top:var(--space-2);padding-left:var(--space-4);border-left:2px solid var(--border);display:none}.nav-module.expanded .nav-sections{display:block}.nav-section{display:flex;align-items:center;padding:var(--space-2) var(--space-3);margin-bottom:var(--space-1);border-radius:var(--radius);cursor:pointer;transition:all var(--transition-fast);font-size:var(--text-sm);color:var(--text-secondary);gap:var(--space-2)}.nav-section:hover{background-color:var(--bg-tertiary);color:var(--text-primary)}.nav-section.active{background:linear-gradient(135deg,var(--primary) 0%,var(--primary-dark) 100%);color:#fff;font-weight:500;box-shadow:var(--shadow-sm)}.nav-section-icon{font-size:var(--text-base);opacity:.7}.nav-section.active .nav-section-icon{opacity:1}.nav-section.completed .nav-section-status{color:var(--success);font-weight:700;margin-left:auto}.main-content{padding:0;width:100%}.main-content:has(.homepage){max-width:none}.course-content{padding:var(--space-8) var(--space-12);max-width:900px;margin:0 auto;width:100%}.homepage-container{width:100%}.progress-container{margin-bottom:var(--space-8);background:var(--bg-card);padding:var(--space-4) var(--space-5);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);border:1px solid var(--border-light)}.progress-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:var(--space-3)}.progress-title{font-size:var(--text-sm);font-weight:600;color:var(--text-primary)}.progress-percentage{font-size:var(--text-sm);font-weight:700;color:var(--primary)}.progress-bar{height:8px;background-color:var(--bg-tertiary);border-radius:var(--radius-full);overflow:hidden}.progress-fill{height:100%;background:linear-gradient(90deg,var(--primary) 0%,var(--primary-light) 100%);border-radius:var(--radius-full);transition:width var(--transition-slow)}.section-header{margin-bottom:var(--space-8)}.section-breadcrumb{display:flex;align-items:center;gap:var(--space-2);font-size:var(--text-sm);color:var(--text-muted);margin-bottom:var(--space-3)}.section-breadcrumb a{color:var(--text-secondary)}.section-breadcrumb a:hover{color:var(--primary)}.section-title{font-size:var(--text-3xl);margin-bottom:var(--space-3);color:var(--text-primary)}.section-subtitle{font-size:var(--text-lg);color:var(--text-secondary);margin-bottom:0;line-height:var(--leading-relaxed)}.learning-objectives{background:linear-gradient(135deg,var(--primary-50) 0%,var(--bg-card) 100%);border:1px solid var(--primary-100);border-radius:var(--radius-lg);padding:var(--space-6);margin-bottom:var(--space-8);box-shadow:var(--shadow-sm)}.learning-objectives-header{display:flex;align-items:center;gap:var(--space-3);margin-bottom:var(--space-4)}.learning-objectives-icon{width:36px;height:36px;background:linear-gradient(135deg,var(--primary) 0%,var(--primary-dark) 100%);border-radius:var(--radius);display:flex;align-items:center;justify-content:center;color:#fff;font-size:1.125rem}.learning-objectives-title{font-family:var(--font-heading);font-size:var(--text-lg);font-weight:700;color:var(--primary-dark);margin:0}.learning-objectives ul{margin:0;padding-left:var(--space-6)}.learning-objectives li{margin-bottom:var(--space-2);color:var(--text-primary);line-height:var(--leading-relaxed)}.learning-objectives li::marker{color:var(--primary)}.content-text{font-size:var(--text-base);line-height:var(--leading-loose);margin-bottom:var(--space-5);color:var(--text-primary)}.content-text.text-important{background:linear-gradient(135deg,var(--primary-50) 0%,var(--bg-card) 100%);border-left:4px solid var(--primary);padding:var(--space-4) var(--space-5);border-radius:0 var(--radius-md) var(--radius-md) 0;box-shadow:var(--shadow-sm)}.content-text.text-warning{background:linear-gradient(135deg,var(--warning-light) 0%,var(--bg-card) 100%);border-left:4px solid var(--warning);padding:var(--space-4) var(--space-5);border-radius:0 var(--radius-md) var(--radius-md) 0;box-shadow:var(--shadow-sm)}.content-heading{margin-top:var(--space-10);margin-bottom:var(--space-4)}.content-heading:first-child{margin-top:0}.content-list{margin-bottom:var(--space-6);padding-left:var(--space-6)}.content-list li{margin-bottom:var(--space-3);line-height:var(--leading-relaxed);padding-left:var(--space-2)}.content-definition{background:var(--bg-card);border-left:4px solid var(--primary);border-radius:0 var(--radius-lg) var(--radius-lg) 0;padding:var(--space-5);margin-bottom:var(--space-6);box-shadow:var(--shadow)}.definition-header{display:flex;align-items:center;gap:var(--space-2);margin-bottom:var(--space-2)}.definition-icon{color:var(--accent-gold);font-size:1.25rem}.definition-label{font-size:var(--text-xs);font-weight:600;text-transform:uppercase;letter-spacing:.05em;color:var(--text-muted)}.definition-term{font-family:var(--font-heading);font-size:var(--text-xl);font-weight:700;color:var(--primary-dark);margin-bottom:var(--space-3)}.definition-text{color:var(--text-secondary);line-height:var(--leading-relaxed);white-space:pre-line}.content-example{background:var(--bg-card);border-radius:var(--radius-lg);overflow:hidden;margin-bottom:var(--space-6);box-shadow:var(--shadow-md);border:1px solid var(--border)}.example-header{background:linear-gradient(135deg,var(--bg-secondary) 0%,var(--bg-tertiary) 100%);padding:var(--space-4) var(--space-5);display:flex;align-items:center;gap:var(--space-3);border-bottom:1px solid var(--border)}.example-icon{font-size:1.5rem}.example-title{font-family:var(--font-heading);font-weight:600;color:var(--text-primary);font-size:var(--text-base)}.example-body{padding:var(--space-5)}.example-content{line-height:var(--leading-relaxed);margin-bottom:var(--space-4);white-space:pre-line}.example-calculation{background:linear-gradient(135deg,var(--bg-secondary) 0%,var(--primary-50) 100%);border-radius:var(--radius-md);padding:var(--space-4) var(--space-5);margin-top:var(--space-4);border:1px solid var(--primary-100)}.calculation-label{display:flex;align-items:center;gap:var(--space-2);font-weight:600;color:var(--primary-dark);margin-bottom:var(--space-3);font-size:var(--text-sm)}.calculation-content{font-family:var(--font-mono);font-size:var(--text-sm);line-height:var(--leading-loose);white-space:pre-wrap;color:var(--text-primary)}.content-formula{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);padding:var(--space-6);margin-bottom:var(--space-6);text-align:center;box-shadow:var(--shadow-sm)}.formula-display{font-family:var(--font-mono);font-size:var(--text-lg);color:var(--primary-dark);background:linear-gradient(135deg,var(--primary-50) 0%,var(--primary-100) 100%);padding:var(--space-4) var(--space-5);border-radius:var(--radius-md);margin-bottom:var(--space-4);overflow-x:auto;border:1px solid var(--primary-200)}.formula-description{font-size:var(--text-sm);color:var(--text-secondary);text-align:left;line-height:var(--leading-relaxed);white-space:pre-line}.table-wrapper{overflow-x:auto;margin-bottom:var(--space-6);border-radius:var(--radius-lg);box-shadow:var(--shadow-md);border:1px solid var(--border)}.content-table{width:100%;border-collapse:collapse;background:var(--bg-card)}.content-table th{background:linear-gradient(135deg,var(--primary) 0%,var(--primary-dark) 100%);color:#fff;font-weight:600;font-size:var(--text-sm);text-align:left;padding:var(--space-4)}.content-table th:first-child{border-radius:var(--radius-lg) 0 0 0}.content-table th:last-child{border-radius:0 var(--radius-lg) 0 0}.content-table td{padding:var(--space-4);border-bottom:1px solid var(--border);font-size:var(--text-sm);line-height:var(--leading-relaxed)}.content-table tbody tr:hover{background-color:var(--bg-secondary)}.content-table tbody tr:last-child td{border-bottom:none}.content-table tbody tr:last-child td:first-child{border-radius:0 0 0 var(--radius-lg)}.content-table tbody tr:last-child td:last-child{border-radius:0 0 var(--radius-lg) 0}.content-quiz{background:var(--bg-card);border-radius:var(--radius-lg);overflow:hidden;margin-bottom:var(--space-6);box-shadow:var(--shadow-md);border:1px solid var(--border)}.quiz-header{background:linear-gradient(135deg,var(--accent-blue) 0%,var(--accent-purple) 100%);padding:var(--space-4) var(--space-5);display:flex;align-items:center;gap:var(--space-3);color:#fff}.quiz-icon{font-size:1.25rem}.quiz-title{font-weight:600;font-size:var(--text-base)}.quiz-body{padding:var(--space-5)}.quiz-question{font-size:var(--text-lg);font-weight:500;margin-bottom:var(--space-5);color:var(--text-primary);line-height:var(--leading-relaxed)}.quiz-options{display:flex;flex-direction:column;gap:var(--space-3);margin-bottom:var(--space-5)}.quiz-option{display:flex;align-items:center;padding:var(--space-4);background:var(--bg-secondary);border:2px solid transparent;border-radius:var(--radius-md);cursor:pointer;transition:all var(--transition-fast)}.quiz-option:hover{background:var(--primary-50);border-color:var(--primary-100)}.quiz-option.correct{background:var(--success-light);border-color:var(--success)}.quiz-option.incorrect{background:var(--error-light);border-color:var(--error)}.quiz-option.disabled{cursor:not-allowed;opacity:.7}.quiz-option 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solid var(--error)}.quiz-feedback-header{display:flex;align-items:center;gap:var(--space-2);font-weight:600;margin-bottom:var(--space-2)}.quiz-feedback.correct .quiz-feedback-header{color:var(--success)}.quiz-feedback.incorrect .quiz-feedback-header{color:var(--error)}.quiz-feedback-text{color:var(--text-primary);line-height:var(--leading-relaxed)}.content-keypoint{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);padding:var(--space-5);margin-bottom:var(--space-6);box-shadow:var(--shadow-sm)}.keypoint-header{display:flex;align-items:center;gap:var(--space-3);margin-bottom:var(--space-4)}.keypoint-icon{font-size:1.25rem}.keypoint-title{font-family:var(--font-heading);font-weight:600;color:var(--text-primary);font-size:var(--text-base)}.keypoint-list{margin:0;padding:0;list-style:none}.keypoint-list li{display:flex;align-items:flex-start;gap:var(--space-3);margin-bottom:var(--space-3);line-height:var(--leading-relaxed)}.keypoint-list li:last-child{margin-bottom:0}.keypoint-list li:before{content:"✓";color:var(--primary);font-weight:700;flex-shrink:0;margin-top:2px}.content-reflection{background:linear-gradient(135deg,var(--accent-purple) 0%,var(--accent-blue) 100%);color:#fff;border-radius:var(--radius-lg);padding:var(--space-6);margin-bottom:var(--space-6);box-shadow:var(--shadow-md)}.reflection-header{display:flex;align-items:center;gap:var(--space-3);margin-bottom:var(--space-4)}.reflection-icon{font-size:1.75rem}.reflection-title{font-family:var(--font-heading);font-weight:600;font-size:var(--text-lg)}.reflection-question{font-size:var(--text-lg);line-height:var(--leading-relaxed);font-style:italic;opacity:.95}.content-exercise{background:var(--bg-card);border:2px dashed var(--accent-gold);border-radius:var(--radius-lg);padding:var(--space-5);margin-bottom:var(--space-6)}.exercise-header{display:flex;align-items:center;gap:var(--space-3);margin-bottom:var(--space-4)}.exercise-icon{width:36px;height:36px;background:linear-gradient(135deg,var(--accent-gold) 0%,var(--accent-gold-light) 100%);border-radius:var(--radius);display:flex;align-items:center;justify-content:center;color:#fff;font-size:1.125rem}.exercise-title{font-family:var(--font-heading);font-weight:600;color:var(--text-primary);font-size:var(--text-base)}.exercise-description{line-height:var(--leading-relaxed);margin-bottom:var(--space-4);white-space:pre-line}.exercise-hint{background:var(--warning-light);border-radius:var(--radius-md);padding:var(--space-4);margin-top:var(--space-4);border:1px solid var(--warning)}.exercise-hint summary{cursor:pointer;font-weight:600;color:var(--accent-gold);display:flex;align-items:center;gap:var(--space-2)}.exercise-hint p{margin-top:var(--space-3);margin-bottom:0;color:var(--text-secondary);line-height:var(--leading-relaxed)}.content-video{margin-bottom:var(--space-6)}.video-header{display:flex;align-items:center;gap:var(--space-3);margin-bottom:var(--space-4)}.video-icon{font-size:1.5rem}.video-title{font-weight:600;font-size:var(--text-base)}.video-duration{color:var(--text-muted);font-size:var(--text-sm);margin-left:auto;background:var(--bg-secondary);padding:var(--space-1) var(--space-3);border-radius:var(--radius-full)}.video-player{width:100%;aspect-ratio:16 / 9;border-radius:var(--radius-lg);background:var(--bg-secondary);border:1px solid var(--border)}.video-placeholder{width:100%;aspect-ratio:16 / 9;background:linear-gradient(135deg,var(--bg-secondary) 0%,var(--bg-tertiary) 100%);border-radius:var(--radius-lg);display:flex;flex-direction:column;align-items:center;justify-content:center;color:var(--text-muted);gap:var(--space-3);border:1px solid var(--border)}.video-placeholder-icon{font-size:3rem;opacity:.5}.video-placeholder-text{font-size:var(--text-sm)}.content-image{margin-bottom:var(--space-6);text-align:center}.content-image img{max-width:100%;height:auto;border-radius:var(--radius-lg);box-shadow:var(--shadow-md)}.content-image figcaption{margin-top:var(--space-3);font-size:var(--text-sm);color:var(--text-secondary);font-style:italic}.btn{display:inline-flex;align-items:center;justify-content:center;gap:var(--space-2);padding:var(--space-3) var(--space-5);border-radius:var(--radius-md);font-family:var(--font-body);font-weight:600;font-size:var(--text-base);border:none;cursor:pointer;transition:all var(--transition-fast);text-decoration:none}.btn-primary{background:linear-gradient(135deg,var(--primary) 0%,var(--primary-dark) 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(max-width: 1024px){.main-content{padding:var(--space-6) var(--space-8)}}@media (max-width: 768px){#app{grid-template-columns:1fr}.navigation{position:fixed;left:-100%;width:85%;max-width:320px;height:100vh;z-index:var(--z-fixed);box-shadow:var(--shadow-lg);transition:left var(--transition)}.navigation.open{left:0}.nav-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#00000080;z-index:calc(var(--z-fixed) - 1);opacity:0;visibility:hidden;transition:all var(--transition)}.nav-overlay.visible{opacity:1;visibility:visible}.mobile-header{display:flex;align-items:center;justify-content:space-between;padding:var(--space-4);background:var(--bg-card);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:var(--z-sticky)}.mobile-menu-btn{background:var(--bg-secondary);border:1px solid var(--border);border-radius:var(--radius);padding:var(--space-2) 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fadeIn{0%{opacity:0}to{opacity:1}}@keyframes slideUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}@keyframes slideInLeft{0%{opacity:0;transform:translate(-20px)}to{opacity:1;transform:translate(0)}}@keyframes pulse{0%,to{opacity:1}50%{opacity:.5}}.animate-fade-in{animation:fadeIn var(--transition-slow) ease-out}.animate-slide-up{animation:slideUp var(--transition-slow) ease-out}.animate-slide-in{animation:slideInLeft var(--transition-slow) ease-out}.content-loading{animation:pulse 1.5s ease-in-out infinite}@media print{.navigation,.progress-container,.quiz-submit,.mobile-header,.section-navigation,.nav-btn{display:none!important}#app{grid-template-columns:1fr}.main-content{max-width:100%;padding:0}.content-quiz,.content-example,.learning-objectives{break-inside:avoid;box-shadow:none;border:1px solid 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1024px){.hero{grid-template-columns:1fr;text-align:center;padding:var(--space-8);min-height:auto}.hero-content{align-items:center}.hero-subtitle{max-width:600px}.hero-actions{justify-content:center}.hero-visual{order:-1}.hero-image{max-width:350px}.progress-card{flex-direction:column;text-align:center}.progress-stats{justify-content:center}}@media (max-width: 640px){.hero-title{font-size:2rem}.hero-actions{flex-direction:column;width:100%}.hero-btn{width:100%;justify-content:center}.modules-grid,.features-grid{grid-template-columns:1fr}}.module-quiz{max-width:900px;margin:0 auto;padding:var(--space-6)}.module-quiz-header{display:flex;align-items:flex-start;gap:var(--space-6);margin-bottom:var(--space-8);padding-bottom:var(--space-6);border-bottom:1px solid var(--border)}.module-quiz-back{display:flex;align-items:center;gap:var(--space-2);padding:var(--space-2) var(--space-4);background:var(--bg-secondary);border:1px solid 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