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1024px){.sidebar-overlay{display:block;position:fixed;top:0;right:0;bottom:0;left:0;background:#00000080;z-index:calc(var(--z-modal) - 1);opacity:0;visibility:hidden;transition:all var(--transition-fast)}.sidebar.open+.sidebar-overlay,.sidebar-overlay:has(+.sidebar.open){opacity:1;visibility:visible}.sidebar{position:fixed;left:0;top:0;height:100vh;z-index:var(--z-modal);transform:translate(-100%);transition:transform var(--transition-base)}.sidebar.open{transform:translate(0)}.sidebar-close{display:block}}.module-page-layout{display:flex;min-height:calc(100vh - 73px)}.module-main{flex:1;position:relative;padding:var(--space-2xl);max-width:1200px;margin:0 auto}.menu-toggle{display:none;position:fixed;bottom:var(--space-lg);left:var(--space-lg);width:48px;height:48px;background:var(--color-bg-tertiary);border:1px solid 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h1{font-size:var(--text-3xl);margin:0}.module-meta{display:flex;align-items:center;gap:var(--space-lg)}.meta-badge{font-size:var(--text-sm);font-weight:600;text-transform:uppercase}.meta-item{font-size:var(--text-sm);color:var(--color-text-muted)}.module-content{animation:fadeIn var(--transition-base) ease-out}.content-section{display:flex;gap:var(--space-lg);margin-bottom:var(--space-2xl);padding-bottom:var(--space-2xl);border-bottom:1px solid rgba(255,255,255,.05)}.content-section:last-of-type{border-bottom:none}.section-marker{position:relative;flex-shrink:0}.marker-number{width:32px;height:32px;display:flex;align-items:center;justify-content:center;background:var(--color-bg-tertiary);border-radius:var(--radius-full);font-size:var(--text-sm);font-weight:600;color:var(--color-text-muted)}.marker-check{position:absolute;top:-4px;right:-4px;width:16px;height:16px;display:flex;align-items:center;justify-content:center;background:var(--color-success);border-radius:50%;font-size:10px;color:#fff}.section-content{flex:1;min-width:0}.section-content h2{font-size:var(--text-xl);margin-bottom:var(--space-md)}.section-text p{font-size:var(--text-base);line-height:1.8;color:var(--color-text-secondary);margin-bottom:var(--space-md)}.section-text p:last-child{margin-bottom:0}.content-table-wrapper{overflow-x:auto;margin:var(--space-lg) 0;border-radius:var(--radius-lg);border:1px solid rgba(255,255,255,.1)}.content-table{width:100%;border-collapse:collapse;font-size:var(--text-sm)}.content-table th,.content-table td{padding:var(--space-sm) var(--space-md);text-align:left;border-bottom:1px solid rgba(255,255,255,.05)}.content-table th{background:var(--color-bg-tertiary);font-weight:600;color:var(--color-text-primary)}.content-table td{color:var(--color-text-secondary)}.content-table tr:last-child td{border-bottom:none}.project-section{padding:var(--space-xl);margin:var(--space-2xl) 0;text-align:center}.project-icon{font-size:2.5rem;margin-bottom:var(--space-md)}.project-section h2{font-size:var(--text-sm);color:var(--color-text-muted);text-transform:uppercase;letter-spacing:1px;margin-bottom:var(--space-sm)}.project-section h3{font-size:var(--text-xl);margin-bottom:var(--space-md)}.project-section p{font-size:var(--text-base);color:var(--color-text-secondary);margin:0}.module-footer{display:flex;flex-direction:column;align-items:center;gap:var(--space-xl);margin-top:var(--space-2xl)}.complete-btn{padding:var(--space-md) var(--space-2xl);font-size:var(--text-base)}.completion-badge{display:flex;align-items:center;gap:var(--space-sm);padding:var(--space-md) var(--space-xl);background:#22c55e1a;border:1px solid var(--color-success);border-radius:var(--radius-full);color:var(--color-success);font-weight:600}.module-nav{display:flex;gap:var(--space-md);width:100%}.nav-btn{flex:1;display:flex;align-items:center;gap:var(--space-md);padding:var(--space-md);background:var(--color-bg-secondary);border:1px solid rgba(255,255,255,.05);border-radius:var(--radius-lg);text-decoration:none;transition:all var(--transition-fast)}.nav-btn:hover{background:var(--color-bg-tertiary);border-color:var(--color-accent-primary)}.nav-btn.next{justify-content:flex-end;text-align:right}.nav-btn>span{font-size:1.5rem;color:var(--color-accent-primary)}.nav-label{display:block;font-size:var(--text-xs);color:var(--color-text-muted);text-transform:uppercase}.nav-title{display:block;font-size:var(--text-sm);font-weight:500;color:var(--color-text-primary)}.ai-chat-toggle{position:fixed;bottom:var(--space-lg);right:var(--space-lg);width:56px;height:56px;display:flex;align-items:center;justify-content:center;background:var(--color-accent-gradient);border:none;border-radius:var(--radius-full);font-size:1.5rem;color:#fff;cursor:pointer;box-shadow:0 4px 20px #6366f166;transition:all var(--transition-fast);z-index:100}.ai-chat-toggle:hover{transform:scale(1.1)}.ai-chat-panel{position:fixed;bottom:calc(56px + var(--space-lg) + var(--space-md));right:var(--space-lg);width:380px;height:500px;z-index:99;box-shadow:var(--shadow-lg);animation:slideUp var(--transition-base) ease-out}@media (max-width: 1024px){.menu-toggle{display:flex;align-items:center;justify-content:center}}@media (max-width: 640px){.module-main{padding:var(--space-lg) var(--space-md)}.module-title-row{flex-direction:column;align-items:flex-start;gap:var(--space-md)}.content-section{flex-direction:column;gap:var(--space-md)}.module-nav{flex-direction:column}.ai-chat-panel{width:calc(100% - var(--space-lg) * 2);right:var(--space-md)}}.section-image-container{margin:var(--space-xl) 0;text-align:center}.section-image{max-width:50%;border-radius:var(--radius-lg);box-shadow:var(--shadow-lg);border:1px solid rgba(255,255,255,.1);transition:transform var(--transition-base)}.section-image:hover{transform:scale(1.01)}.image-caption{margin-top:var(--space-sm);font-size:var(--text-sm);color:var(--color-text-secondary);font-style:italic}.chat-page{min-height:calc(100vh - 73px);padding:var(--space-lg)}.chat-container{display:grid;grid-template-columns:300px 1fr;gap:var(--space-lg);max-width:1400px;margin:0 auto;height:calc(100vh - 73px - var(--space-lg) * 2)}.chat-sidebar{padding:var(--space-xl);background:var(--color-bg-secondary);border-radius:var(--radius-xl);border:1px solid rgba(255,255,255,.05);overflow-y:auto}.chat-sidebar h2{font-size:var(--text-xl);margin-bottom:var(--space-md)}.chat-sidebar>p{font-size:var(--text-sm);color:var(--color-text-secondary);margin-bottom:var(--space-md)}.chat-sidebar ul{list-style:none;margin-bottom:var(--space-xl)}.chat-sidebar li{position:relative;padding-left:var(--space-md);font-size:var(--text-sm);color:var(--color-text-muted);margin-bottom:var(--space-sm)}.chat-sidebar li:before{content:"→";position:absolute;left:0;color:var(--color-accent-primary)}.tips-section h3{font-size:var(--text-sm);color:var(--color-text-secondary);margin-bottom:var(--space-md);padding-bottom:var(--space-sm);border-bottom:1px solid rgba(255,255,255,.05)}.tip{margin-bottom:var(--space-md);padding:var(--space-sm);background:var(--color-bg-tertiary);border-radius:var(--radius-md)}.tip strong{display:block;font-size:var(--text-sm);color:var(--color-text-primary);margin-bottom:4px}.tip p{font-size:var(--text-xs);color:var(--color-text-muted);margin:0}.chat-main{display:flex;flex-direction:column}.chat-main .ai-chat{flex:1;height:100%}@media (max-width: 900px){.chat-container{grid-template-columns:1fr;height:auto}.chat-sidebar{display:none}.chat-main .ai-chat{height:calc(100vh - 73px - var(--space-lg) * 2)}}.quiz-component{background:var(--color-bg-secondary);border-radius:var(--radius-xl);border:1px solid var(--color-border);overflow:hidden}.quiz-header{padding:var(--space-xl);background:var(--color-bg-tertiary);border-bottom:1px solid var(--color-border)}.quiz-info h3{font-size:var(--text-xl);margin-bottom:var(--space-xs)}.quiz-info p{font-size:var(--text-sm);color:var(--color-text-muted);margin:0}.quiz-progress{margin-top:var(--space-md)}.progress-text{font-size:var(--text-sm);color:var(--color-text-secondary);margin-bottom:var(--space-xs);display:block}.progress-bar{height:6px;background:var(--color-bg-primary);border-radius:var(--radius-full);overflow:hidden}.progress-fill{height:100%;background:var(--color-accent-gradient);border-radius:var(--radius-full);transition:width var(--transition-base)}.question-card{padding:var(--space-xl)}.question-header{margin-bottom:var(--space-md)}.difficulty-badge{font-size:var(--text-xs);font-weight:600;text-transform:uppercase;padding:var(--space-xs) var(--space-sm);border-radius:var(--radius-full)}.difficulty-badge.easy{background:#22c55e33;color:var(--color-success)}.difficulty-badge.medium{background:#3b82f633;color:var(--color-info)}.difficulty-badge.hard{background:#ef444433;color:var(--color-error)}.question-text{font-size:var(--text-lg);font-weight:500;color:var(--color-text-primary);margin-bottom:var(--space-lg);line-height:1.5}.options-list{display:flex;flex-direction:column;gap:var(--space-sm)}.option{display:flex;align-items:center;gap:var(--space-md);padding:var(--space-md);background:var(--color-bg-tertiary);border:2px solid transparent;border-radius:var(--radius-lg);cursor:pointer;text-align:left;font-family:var(--font-sans);transition:all var(--transition-fast)}.option:hover:not(:disabled){background:var(--color-bg-glass);border-color:var(--color-accent-primary)}.option:disabled{cursor:default}.option.selected{border-color:var(--color-accent-primary);background:#6366f11a}.option.correct{border-color:var(--color-success)!important;background:#22c55e1a!important}.option.incorrect{border-color:var(--color-error)!important;background:#ef44441a!important}.option-letter{width:32px;height:32px;display:flex;align-items:center;justify-content:center;background:var(--color-bg-primary);border-radius:var(--radius-md);font-weight:600;font-size:var(--text-sm);color:var(--color-text-secondary);flex-shrink:0}.option.correct .option-letter{background:var(--color-success);color:#fff}.option.incorrect .option-letter{background:var(--color-error);color:#fff}.option-text{flex:1;font-size:var(--text-base);color:var(--color-text-primary)}.option-icon{font-size:1.25rem}.explanation{margin-top:var(--space-lg);padding:var(--space-md);border-radius:var(--radius-lg);animation:slideUp var(--transition-fast) ease-out}.explanation.correct{background:#22c55e1a;border:1px solid var(--color-success)}.explanation.incorrect{background:#ef44441a;border:1px solid var(--color-error)}.explanation-header{font-weight:600;margin-bottom:var(--space-sm)}.explanation.correct .explanation-header{color:var(--color-success)}.explanation.incorrect .explanation-header{color:var(--color-error)}.explanation p{font-size:var(--text-sm);color:var(--color-text-secondary);margin:0;line-height:1.6}.quiz-navigation{display:flex;align-items:center;justify-content:space-between;padding:var(--space-lg) var(--space-xl);background:var(--color-bg-tertiary);border-top:1px solid var(--color-border)}.question-dots{display:flex;gap:var(--space-xs)}.dot{width:10px;height:10px;border-radius:50%;background:var(--color-bg-primary);transition:all var(--transition-fast)}.dot.active{background:var(--color-accent-primary);transform:scale(1.2)}.dot.answered{background:var(--color-success)}.quiz-results{padding:var(--space-3xl);text-align:center}.results-icon{font-size:4rem;margin-bottom:var(--space-lg)}.quiz-results h2{font-size:var(--text-2xl);margin-bottom:var(--space-sm)}.results-message{font-size:var(--text-base);color:var(--color-text-secondary);max-width:400px;margin:0 auto var(--space-xl)}.score-display{margin-bottom:var(--space-xl)}.score-circle{width:150px;height:150px;margin:0 auto;display:flex;flex-direction:column;align-items:center;justify-content:center;border-radius:50%;background:conic-gradient(var(--color-accent-primary) calc(var(--score) * 3.6deg),var(--color-bg-tertiary) 0);position:relative}.score-circle:before{content:"";position:absolute;top:8px;right:8px;bottom:8px;left:8px;background:var(--color-bg-secondary);border-radius:50%}.score-value{position:relative;font-size:var(--text-3xl);font-weight:700;background:var(--color-accent-gradient);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.score-label{position:relative;font-size:var(--text-sm);color:var(--color-text-muted)}.results-stats{display:flex;justify-content:center;gap:var(--space-2xl);margin-bottom:var(--space-xl)}.results-stats .stat{display:flex;flex-direction:column}.results-stats .stat-value{font-size:var(--text-xl);font-weight:600;color:var(--color-text-primary)}.results-stats .stat-label{font-size:var(--text-sm);color:var(--color-text-muted)}.results-actions{display:flex;justify-content:center;gap:var(--space-md)}@media (max-width: 640px){.quiz-navigation{flex-wrap:wrap;gap:var(--space-md)}.question-dots{order:3;width:100%;justify-content:center}}.lab-component{background:var(--color-bg-secondary);border-radius:var(--radius-xl);border:1px solid rgba(255,255,255,.05);overflow:hidden}.lab-header{padding:var(--space-xl);background:var(--color-bg-tertiary);border-bottom:1px solid rgba(255,255,255,.05)}.lab-title-row{display:flex;align-items:flex-start;gap:var(--space-md);margin-bottom:var(--space-md)}.lab-icon{font-size:2rem}.lab-title-row h3{font-size:var(--text-xl);margin-bottom:var(--space-xs)}.lab-title-row p{font-size:var(--text-sm);color:var(--color-text-muted);margin:0}.lab-meta{display:flex;gap:var(--space-lg)}.difficulty-tag,.time-tag{font-size:var(--text-sm);font-weight:500}.time-tag{color:var(--color-text-muted)}.lab-objectives{padding:var(--space-lg) var(--space-xl);background:#6366f10d;border-bottom:1px solid rgba(255,255,255,.05)}.lab-objectives h4{font-size:var(--text-sm);color:var(--color-accent-primary);margin-bottom:var(--space-sm);text-transform:uppercase;letter-spacing:.5px}.lab-objectives ul{list-style:none;display:flex;flex-wrap:wrap;gap:var(--space-md)}.lab-objectives li{display:flex;align-items:center;gap:var(--space-xs);font-size:var(--text-sm);color:var(--color-text-secondary)}.objective-check{color:var(--color-accent-primary)}.lab-content{display:grid;grid-template-columns:240px 1fr}.step-sidebar{padding:var(--space-lg);background:var(--color-bg-tertiary);border-right:1px solid rgba(255,255,255,.05)}.step-sidebar h4{font-size:var(--text-xs);color:var(--color-text-muted);text-transform:uppercase;letter-spacing:1px;margin-bottom:var(--space-md)}.step-list{display:flex;flex-direction:column;gap:var(--space-xs)}.step-item{display:flex;align-items:center;gap:var(--space-sm);padding:var(--space-sm) var(--space-md);background:transparent;border:none;border-radius:var(--radius-md);cursor:pointer;text-align:left;font-family:var(--font-sans);transition:all var(--transition-fast)}.step-item:hover{background:var(--color-bg-glass)}.step-item.active{background:var(--color-bg-primary)}.step-item.completed .step-number{background:var(--color-success);color:#fff}.step-number{width:24px;height:24px;display:flex;align-items:center;justify-content:center;background:var(--color-bg-primary);border-radius:var(--radius-sm);font-size:var(--text-xs);font-weight:600;color:var(--color-text-muted);flex-shrink:0}.step-item.active .step-number{background:var(--color-accent-primary);color:#fff}.step-title{font-size:var(--text-sm);color:var(--color-text-primary);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.lab-completed-badge{margin-top:var(--space-lg);padding:var(--space-sm);background:#22c55e1a;border:1px solid var(--color-success);border-radius:var(--radius-md);text-align:center;font-size:var(--text-sm);font-weight:500;color:var(--color-success)}.step-content{padding:var(--space-xl)}.step-header{margin-bottom:var(--space-lg)}.step-badge{font-size:var(--text-xs);color:var(--color-text-muted);text-transform:uppercase;letter-spacing:.5px}.step-header h4{font-size:var(--text-xl);margin-top:var(--space-xs)}.step-instruction{margin-bottom:var(--space-lg)}.step-instruction p{font-size:var(--text-base);color:var(--color-text-secondary);line-height:1.7;margin:0}.step-code,.hint-section{margin-bottom:var(--space-lg)}.hint-toggle,.solution-toggle{display:flex;align-items:center;gap:var(--space-sm);padding:var(--space-sm) var(--space-md);background:var(--color-bg-tertiary);border:1px solid rgba(255,255,255,.1);border-radius:var(--radius-md);color:var(--color-text-secondary);font-size:var(--text-sm);font-family:var(--font-sans);cursor:pointer;transition:all var(--transition-fast)}.hint-toggle:hover,.solution-toggle:hover{background:var(--color-bg-glass);border-color:var(--color-accent-primary)}.hint-content{margin-top:var(--space-sm);padding:var(--space-md);background:#f59e0b1a;border:1px solid var(--color-warning);border-radius:var(--radius-md);font-size:var(--text-sm);color:var(--color-text-secondary);line-height:1.6;animation:slideUp var(--transition-fast) ease-out}.expected-output{margin-bottom:var(--space-lg);padding:var(--space-md);background:var(--color-bg-tertiary);border-radius:var(--radius-md)}.expected-output h5{font-size:var(--text-xs);color:var(--color-text-muted);text-transform:uppercase;margin-bottom:var(--space-sm)}.expected-output pre{font-family:var(--font-mono);font-size:var(--text-sm);color:var(--color-success);margin:0;white-space:pre-wrap}.step-actions{display:flex;justify-content:space-between;gap:var(--space-md);margin-top:var(--space-xl);padding-top:var(--space-lg);border-top:1px solid rgba(255,255,255,.05)}.solution-section{padding:var(--space-lg) var(--space-xl);background:var(--color-bg-tertiary);border-top:1px solid rgba(255,255,255,.05)}@media (max-width: 900px){.lab-content{grid-template-columns:1fr}.step-sidebar{border-right:none;border-bottom:1px solid rgba(255,255,255,.05)}.step-list{flex-direction:row;flex-wrap:wrap;gap:var(--space-sm)}.step-title{display:none}}.project-component{display:flex;flex-direction:column;gap:var(--space-xl)}.project-header{background:var(--color-bg-secondary);border:1px solid rgba(255,255,255,.05);border-radius:var(--radius-xl);padding:var(--space-xl);display:grid;grid-template-columns:auto 1fr auto;gap:var(--space-lg);align-items:center}.project-icon-wrapper{width:64px;height:64px;background:#6366f11a;border-radius:var(--radius-lg);display:flex;align-items:center;justify-content:center}.project-icon{font-size:2rem}.project-header h3{font-size:var(--text-xl);margin-bottom:var(--space-xs)}.project-header p{color:var(--color-text-secondary);font-size:var(--text-base);margin:0}.project-meta{display:flex;flex-direction:column;gap:var(--space-sm);align-items:flex-end}.meta-tag{font-size:var(--text-sm);font-weight:500;padding:var(--space-xs) var(--space-sm);border:1px solid rgba(255,255,255,.1);border-radius:var(--radius-full)}.project-grid{display:grid;grid-template-columns:1fr 300px;gap:var(--space-xl)}.section-card{background:var(--color-bg-secondary);border:1px solid rgba(255,255,255,.05);border-radius:var(--radius-xl);padding:var(--space-xl);margin-bottom:var(--space-xl)}.section-card h4{font-size:var(--text-lg);margin-bottom:var(--space-lg);color:var(--color-text-primary);display:flex;align-items:center;gap:var(--space-sm)}.progress-container{margin-bottom:var(--space-xl)}.progress-bar-bg{height:8px;background:var(--color-bg-tertiary);border-radius:var(--radius-full);margin-bottom:var(--space-xs);overflow:hidden}.progress-bar-fill{height:100%;background:var(--color-accent-gradient);border-radius:var(--radius-full);transition:width .3s ease}.progress-text{font-size:var(--text-sm);color:var(--color-text-muted);font-weight:500}.milestones-list{display:flex;flex-direction:column;gap:var(--space-md)}.milestone-item{display:flex;gap:var(--space-md);padding:var(--space-md);background:var(--color-bg-tertiary);border:1px solid transparent;border-radius:var(--radius-lg);cursor:pointer;transition:all .2s 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