#course-header{height:var(--header-height);background:var(--bg-color);border-bottom:1px solid var(--input-border-color);padding:0 var(--spacing-md);position:sticky;top:0;z-index:110}.header-content{display:flex;align-items:center;justify-content:space-between;height:100%;max-width:100%}.header-controls{display:flex;align-items:center;gap:var(--spacing-md)}.control-buttons{display:flex;align-items:center;gap:.5rem}.control-buttons .bttn-icon{position:relative}.control-buttons .theme-icon{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);transition:transform .3s ease-in-out!important}.control-buttons #theme-toggle{position:relative;display:flex;align-items:center;justify-content:center}.control-buttons #theme-toggle .theme-icon{position:absolute;width:calc(var(--bttn-icon-size) * 1.4);height:calc(var(--bttn-icon-size) * 1.4)}.control-buttons #theme-toggle .theme-icon.sun{transform:translate(-50%,-50%) scale(0)}.control-buttons #theme-toggle .theme-icon.moon{transform:translate(-50%,-50%) scale(1)}[data-theme=dark] .control-buttons #theme-toggle .theme-icon.moon{transform:translate(-50%,-50%) rotate(360deg) scale(0)}[data-theme=dark] .control-buttons #theme-toggle .theme-icon.sun{transform:translate(-50%,-50%) scale(1) rotate(360deg)}#course-header #course-title{margin:0;font-size:clamp(1.125rem, 2.5vw, 1.5rem);color:var(--text-primary);font-weight:500;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:40vw}#course-header .header-title-logo{display:flex;align-items:center;gap:var(--spacing-sm);flex:none}@media (max-width:1024px){#course-title{max-width:35vw}}@media (max-width:768px){.header-content{flex-direction:row;justify-content:space-between;align-items:center;gap:var(--spacing-sm);padding:0}#course-header{height:var(--header-height);padding:0 var(--spacing-sm)}.header-controls{gap:var(--spacing-sm);flex-shrink:0}#course-title{max-width:none;flex:1;min-width:0;font-size:1rem}.control-buttons{gap:.25rem;flex-shrink:0}}@media (max-width:520px){#course-header{padding:0 var(--spacing-xs)}.header-controls{gap:var(--spacing-xs)}#course-title{font-size:.9rem}.control-buttons{gap:.125rem}.control-buttons .bttn-icon{width:2rem!important;height:2rem!important}}:root{--primary-color:var(--brand-color);--secondary-color:var(--text-secondary-color);--background-color:var(--bg-color);--bg-muted-color:#fbfbfb;--sidebar-bg:#f8fafc;--sidebar-bg-rgb:248,250,252;--border-color:var(--input-border-color);--text-primary:var(--text-primary-color);--text-secondary:var(--text-secondary-color);--success-color:var(--active-green);--highlight-color:0,191,255;--shadow-border:rgba(0, 0, 0, 0.1);--header-height:70px;--sidebar-width:300px;--border-radius:10px;--spacing-xs:0.5rem;--spacing-sm:1rem;--spacing-md:1.5rem;--spacing-lg:2rem;--control-bar-height:60px;--skeleton-base:#e4eaeb;--skeleton-highlight:#e9ecef;--skeleton-shimmer:#d3dbdb;--skeleton-overlay:rgba(240, 244, 246, 0.8);--content-bg:var(--bg-color);--control-bar-bg:var(--bg-color);--breadcrumb-bg:var(--sidebar-bg);--breadcrumb-bg-rgb:248,250,252;--breadcrumb-text:#64748b;--breadcrumb-text-active:#334155;--breadcrumb-border:var(--border-color);--wp-problem-bg:#FFFBE6;--wp-problem-text:#B38600;--wp-problem-border:#FFECB3;--wp-formula-bg:#E6FAF8;--wp-formula-text:#003C38;--wp-formula-border:#B2E4DE;--wp-concept-bg:#f7f4ff;--wp-concept-text:#5400ff;--wp-concept-border:#d6c7ff;--wp-notice-bg:#F0F4FF;--wp-notice-text:#003B8E;--wp-notice-border:#C6D7FF;--progress-ring-stroke:rgb(80, 80, 80);--progress-ring-bg:rgba(160, 160, 160, 0.5)}[data-theme=dark]{--content-bg:var(--bg-color);--sidebar-bg:rgb(25, 25, 25);--sidebar-bg-rgb:25,25,25;--bg-muted-color:#151515;--control-bar-bg:var(--bg-color);--highlight-color:0,191,255;--shadow-border:rgba(255, 255, 255, 0.1);--nav-hover-bg:rgba(255, 255, 255, 0.1);--nav-active-bg:rgba(0, 114, 255, 0.2);--nav-active-border:rgba(0, 114, 255, 0.4);--breadcrumb-bg:var(--sidebar-bg);--breadcrumb-bg-rgb:25,25,25;--breadcrumb-text:#94a3b8;--breadcrumb-text-active:#e2e8f0;--breadcrumb-border:#374151;--wp-problem-bg:#B38600;--wp-problem-text:#FFFBE6;--wp-problem-border:#B38600;--wp-formula-bg:#003C38;--wp-formula-text:#E6FAF8;--wp-formula-border:#003C38;--wp-concept-bg:#5400ff;--wp-concept-text:#f7f4ff;--wp-concept-border:#5400ff;--wp-notice-bg:#003B8E;--wp-notice-text:#F0F4FF;--wp-notice-border:#003B8E;--progress-ring-stroke:#ffffff;--progress-ring-bg:rgba(255, 255, 255, 0.2);--skeleton-base:#2a2a2a;--skeleton-highlight:#404040;--skeleton-shimmer:#4a4a4a;--skeleton-overlay:rgba(255, 255, 255, 0.1)}*{margin:0;padding:0;box-sizing:border-box}body,html{height:100%;font-family:system-ui,-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,Oxygen,Ubuntu,Cantarell,'Open Sans','Helvetica Neue',sans-serif;background-color:var(--background-color);overflow:hidden}#course-view-container{height:100%;display:grid;grid-template-rows:var(--header-height) 1fr var(--control-bar-height,60px);grid-template-areas:"header" "main" "controls";overflow:hidden}#main-layout{display:grid;grid-template-areas:"left-sidebar content right-sidebar";height:100%;overflow:hidden;transition:all .3s ease;position:relative}#main-layout.content-only{grid-template-columns:1fr!important;grid-template-areas:"content"!important}#main-layout.content-only #left-sidebar,#main-layout.content-only #right-sidebar{display:none!important;width:0!important;min-width:0!important;padding:0!important;margin:0!important;border:none!important}body.content-only-layout #bottom-control-bar{display:none!important}body.content-only-layout #course-view-container{grid-template-rows:var(--header-height) 1fr;grid-template-areas:"header" "main"}body.content-only-layout #main-layout{height:100%}#main-layout.left-collapsed{grid-template-columns:0 1fr var(--sidebar-width)}#left-sidebar.collapsed{width:0!important;min-width:0!important;padding:0!important;overflow:hidden;margin:0;border:none}#content-area{grid-area:content;overflow-y:auto;padding:0;background-color:var(--content-bg);transition:all .3s ease;min-width:0;min-height:0;width:100%;margin:0;display:block;position:relative;z-index:1;scroll-behavior:smooth;overscroll-behavior-y:contain}#main-layout.content-only #content-area{width:100%!important;min-width:0!important;margin:0!important}#main-layout.left-collapsed #content-area{margin-left:0}#main-layout.right-collapsed #content-area{margin-right:0}.resizing{user-select:none;pointer-events:none}body.resizing{cursor:col-resize!important}.sidebar.collapsed .sidebar-resize-handle{display:none}#lesson-content{display:block;max-width:1325px;padding:1.5rem;min-height:200px;width:100%;box-sizing:border-box;margin:0 auto;transition:max-width .3s ease,padding .3s ease}@media (max-width:1400px){#lesson-content{max-width:1200px}}@media (max-width:1200px){#lesson-content{max-width:1000px}}@media (max-width:1000px){#lesson-content{max-width:900px}}@media (max-width:900px){#lesson-content{max-width:100%;padding:3% 6%}}@media (max-width:768px){#lesson-content{padding:1.5rem}}.lesson-content{max-width:700px;width:100%;display:block}#main-layout.left-collapsed .lesson-content{margin:0 auto!important}.notes-placeholder{color:var(--text-secondary);font-style:italic;text-align:center;padding:calc(var(--spacing-md) + 20px)}.loading{opacity:.6;pointer-events:none}.fade-in{animation:fadeIn .3s ease-in}[data-theme=dark] .lesson-content-container img,[data-theme=dark] .lesson-practice-container img{filter:invert(1) hue-rotate(180deg)}[data-theme=dark] .nav-lesson:hover{background:var(--nav-hover-bg)}[data-theme=dark] .nav-lesson.current{background-color:var(--nav-active-bg);border:1px solid var(--nav-active-border);color:var(--text-primary)}[data-theme=dark] .module-lessons{border-color:rgba(255,255,255,.15)}[data-theme=dark] .toggle-icon{color:var(--text-secondary)}@media (max-width:1024px){#main-layout{grid-template-columns:minmax(200px,250px) 1fr minmax(200px,250px)}#main-layout.left-collapsed{grid-template-columns:0 1fr minmax(200px,250px)}#main-layout.right-collapsed{grid-template-columns:minmax(200px,250px) 1fr 0}#main-layout.left-collapsed.right-collapsed{grid-template-columns:0 1fr 0}}@media (max-width:768px){#main-layout{grid-template-columns:1fr;grid-template-areas:"content";height:100%;overflow:hidden!important;position:relative}#main-layout.left-collapsed,#main-layout.left-collapsed.right-collapsed,#main-layout.right-collapsed{grid-template-columns:1fr;grid-template-areas:"content"}#content-area{grid-area:content;width:100%!important;min-width:0!important;padding:0;display:block!important;overflow-y:auto!important;overflow-x:hidden!important;overscroll-behavior-y:contain!important;-webkit-overflow-scrolling:touch}#left-sidebar{position:fixed;top:var(--header-height);left:0;height:calc(100vh - var(--header-height) - var(--control-bar-height));width:var(--sidebar-width);min-width:250px;max-width:85vw;z-index:1100;transform:translateX(-100%);box-shadow:2px 0 10px rgba(0,0,0,.2);overflow-y:auto;overflow-x:hidden}#left-sidebar:not(.collapsed){transform:translateX(0)}#main-layout.content-only #left-sidebar{transform:none!important;position:static!important;box-shadow:none!important}}@media (max-width:768px){.control-bar-container{padding:0 var(--spacing-sm)}.lesson-controls{gap:var(--spacing-xs)}}@media (max-width:480px){.control-bar-container{padding:0 var(--spacing-xs)}.lesson-controls{gap:.25rem}#complete-lesson-btn{padding:var(--spacing-xs);font-size:.875rem}#complete-lesson-btn .btn-text{display:none}#complete-lesson-btn::after{content:attr(aria-label);position:absolute;top:-2.5rem;left:50%;transform:translateX(-50%);background:var(--text-primary);color:var(--background-color);padding:.25rem .5rem;border-radius:.25rem;font-size:.75rem;white-space:nowrap;opacity:0;pointer-events:none;transition:opacity .2s ease}#complete-lesson-btn:hover::after{opacity:1}}@media (max-width:1200px){#content-area{min-width:0!important;flex:1}}@media (max-width:480px){#content-area{width:100%!important;min-width:0!important;max-width:100%!important}#lesson-content{padding:var(--spacing-sm);max-width:none}}@media (max-width:768px){#content-area{display:block!important;visibility:visible!important;opacity:1!important;width:100%!important;min-width:0!important;grid-area:content!important}#main-layout{width:100%!important;min-width:100%!important;grid-template-columns:1fr!important;grid-template-areas:"content"!important}#left-sidebar,#right-sidebar{position:fixed!important;z-index:100!important}#main-layout.content-only{grid-template-columns:1fr!important;grid-template-areas:"content"!important}#main-layout.content-only #content-area{display:block!important;width:100%!important}}@keyframes content-fade-in{0%{opacity:0;transform:translateY(10px)}100%{opacity:1;transform:translateY(0)}}@keyframes fadeIn{from{opacity:0}to{opacity:1}}#report-error-btn{display:none}.module-view{max-width:960px;margin:0 auto;padding:var(--spacing-lg) var(--spacing-md);overflow-x:hidden;background-color:var(--content-bg)}.module-view .module-view-header{text-align:center;margin-bottom:var(--spacing-md);position:relative}.module-view .module-status{display:inline-block;margin-bottom:var(--spacing-sm)}.module-view .module-status.completed{color:var(--success-color);background-color:rgba(0,205,0,.05);box-shadow:0 0 8px 1px rgba(0,205,0,.1);border-radius:6px;padding:.1rem .4rem;font-weight:400}.module-view .module-status.in-progress{color:#ff9800;background-color:rgba(255,152,0,.05);box-shadow:0 0 8px 1px rgba(255,152,0,.1);border-radius:6px;padding:.1rem .4rem;font-weight:400}.module-view .module-status.not-started{color:var(--text-muted-color);font-weight:500}.module-view .module-view-title{margin-bottom:var(--spacing-md);color:var(--text-primary);line-height:2rem;font-size:var(--text-xxl);letter-spacing:var(--ls-base)}.module-view .module-prefix{color:var(--text-muted-color)}.module-view .module-view-description{margin-bottom:var(--spacing-lg);padding:var(--spacing-md);background:var(--sidebar-bg);border-radius:var(--border-radius);box-shadow:0 2px 4px rgba(0,0,0,.05)}.module-view .module-view-description h2{font-size:1.5rem;font-weight:600;margin-bottom:var(--spacing-sm);color:var(--text-primary);padding-bottom:var(--spacing-xs)}.module-view .module-description-content{line-height:1.7;color:var(--text-secondary);font-size:1rem}.module-view .module-view-actions{display:flex;justify-content:center;gap:10px;margin-bottom:var(--spacing-md);flex-wrap:wrap}.module-view .module-view-actions .bttn{min-height:47px;min-width:47px;padding:.8rem 1rem;font-size:var(--text-base)}.module-view .module-view-actions .restart-module-btn:hover{color:#ff2626;background-color:rgba(255,38,38,.1);border-color:rgba(255,38,38,.2)}.module-view .module-action-buttons{display:flex;gap:var(--spacing-xs)}.module-view .module-view-lessons{margin-top:5rem}.module-view .lessons-section-title{display:block;font-size:var(--text-lg);font-weight:400;margin-bottom:var(--spacing-md);color:var(--text-tertiary-color);letter-spacing:var(--ls-base);text-align:left}.module-view .lessons-list{display:flex;flex-direction:column;gap:var(--spacing-md)}.module-view .module-view-lesson{position:relative;border-radius:12px;padding:var(--spacing-md);display:grid;grid-template-columns:auto 1fr auto;grid-template-areas:"number content actions";gap:var(--spacing-sm) var(--spacing-md);align-items:center;box-shadow:0 0 0 1px var(--shadow-border);overflow:hidden;z-index:0}.module-view .module-view-lesson::before{content:'';position:absolute;top:0;left:0;right:0;bottom:0;z-index:-1;transition:opacity .8s ease;opacity:0;pointer-events:none}.module-view .module-view-lesson.completed{background:linear-gradient(120deg,rgba(0,175,0,.1) 10%,transparent 75%);border-left:2px solid var(--success-color)}.module-view .module-view-lesson.completed::before{background:linear-gradient(120deg,rgba(0,175,0,.1) 25%,transparent 100%)}.module-view .module-view-lesson.completed:hover::before{opacity:1}.module-view .module-view-lesson.started{background:linear-gradient(120deg,rgba(251,191,36,.1) 10%,transparent 75%);border-left:2px solid #fbbf24}.module-view .module-view-lesson.started::before{background:linear-gradient(120deg,rgba(251,191,36,.1) 25%,transparent 100%)}.module-view .module-view-lesson.started:hover::before{opacity:1}.module-view .module-view-lesson.not-started{background:linear-gradient(120deg,rgba(0,114,255,.1) 10%,transparent 75%);border-left:2px solid #0072ff}.module-view .module-view-lesson.not-started::before{background:linear-gradient(120deg,rgba(0,114,255,.1) 25%,transparent 100%)}.module-view .module-view-lesson.not-started:hover::before{opacity:1}.module-view .lesson-number{grid-area:number;width:38px;height:38px;background:var(--primary-color);border-radius:12px;display:flex;align-items:center;justify-content:center;font-weight:500;font-size:var(--text-lg);color:#fff;flex-shrink:0;box-shadow:0 2px 4px rgba(0,0,0,.1);align-self:center}.module-view .module-view-lesson.completed .lesson-number{background:var(--success-color)}.module-view .module-view-lesson.started .lesson-number{background:#fbbf24}.module-view .lesson-content{grid-area:content;min-width:0;display:flex;flex-direction:column;justify-content:center}.module-view .lesson-title{font-size:var(--text-lg);font-weight:500;color:var(--text-primary);line-height:1.6;display:block}.module-view .lesson-title svg{display:inline!important;margin-right:1rem;vertical-align:middle!important;width:var(--text-lg)!important;height:var(--text-lg)!important;scale:1.1;margin-top:-2px}.module-view .lesson-description{line-height:1.6;color:var(--text-tertiary-color);font-size:var(--text-base);margin-bottom:0}.module-view .lesson-description .expand-btn{display:inline-flex;padding:0;border-radius:0;background:0 0;border:none;color:var(--text-secondary);font-size:inherit;cursor:pointer;transition:color .2s ease;position:relative;text-decoration:none;gap:.25rem}.module-view .lesson-description .expand-btn:hover{color:var(--primary-color)}.module-view .lesson-description .expand-btn::after{content:'';position:absolute;bottom:-2px;left:0;width:0;height:1px;background-color:var(--primary-color);transition:width .3s ease}.module-view .lesson-description .expand-btn:hover::after{width:100%}.module-view .lesson-description .expand-btn.expanded svg{transform:rotate(180deg)}.module-view .lesson-description .expand-btn svg{stroke:currentColor!important}.module-view .lesson-description .description-text{text-decoration:none}.module-view .lesson-status{display:flex;align-items:center;letter-spacing:var(--ls-lg);gap:var(--spacing-xs);font-size:var(--text-xs);color:var(--text-secondary);text-transform:uppercase;font-weight:400;margin-bottom:1rem}.module-view .lesson-status .status-badge{display:flex;align-items:center;gap:var(--spacing-xs);border-radius:6px;padding:.2rem .4rem;font-weight:400}.module-view .lesson-status .status-badge svg{width:.8rem;height:.8rem}.module-view .lesson-status .status-badge.completed{color:var(--success-color);background-color:rgba(0,205,0,.05);box-shadow:0 0 1px 1px rgba(0,205,0,.1)}.module-view .lesson-status .status-badge.in-progress{color:#ff9800;background-color:rgba(255,152,0,.05);box-shadow:0 0 1px 1px rgba(255,152,0,.1)}.module-view .lesson-status .status-badge.not-started{color:#0072ff;background-color:rgb(0,114,255,.05);box-shadow:0 0 1px 1px rgb(0,114,255,.1)}.module-view .lesson-actions{grid-area:actions;flex-shrink:0;justify-self:end;align-self:center;display:flex;gap:var(--spacing-xs)}.module-view .lesson-actions .start-lesson-btn{padding-left:1.5rem;padding-right:1.5rem;font-size:var(--text-base)}@media (max-width:768px){.module-view .module-view{padding:var(--spacing-md) var(--spacing-sm)}.module-view .module-view-title{font-size:1.875rem}.module-view .module-view-lesson{grid-template-columns:1fr auto;grid-template-areas:"number number" "content actions"}.module-view .lesson-number{justify-self:start;margin-bottom:var(--spacing-xs)}.module-view .lesson-actions{justify-self:end;align-self:start}}@media (max-width:480px){.module-view .module-view-title{font-size:1.6rem}.module-view .module-view-description{padding:var(--spacing-sm)}.module-view .module-view-description h2{font-size:1.3rem}.module-view .module-description-content{font-size:.95rem}.module-view .module-view-lesson{grid-template-columns:1fr;grid-template-areas:"number" "content" "actions";text-align:left}.module-view .lesson-number{justify-self:center;margin-bottom:var(--spacing-xs)}.module-view .lesson-status{justify-content:center}.module-view .lesson-actions{margin-top:var(--spacing-sm);justify-content:center}.module-view .lesson-actions{margin-top:var(--spacing-sm);justify-content:center;align-items:center;width:100%}.module-view .lesson-actions .start-lesson-btn{width:100%}}.module-view-footer{margin-top:var(--spacing-2xl);padding-top:var(--spacing-xl);text-align:center;color:var(--text-secondary)}.module-view-lesson-skeleton{display:flex;align-items:flex-start;gap:var(--spacing-lg);padding:var(--spacing-lg);background:var(--bg-secondary);border-radius:var(--radius-md);margin-bottom:var(--spacing-md);box-shadow:0 0 0 1px var(--shadow-border)}.module-view-lesson-skeleton .lesson-number{display:flex;align-items:center;justify-content:center;width:48px;height:48px;background:var(--bg-primary);border-radius:50%;font-weight:600;font-size:var(--font-size-lg);color:var(--text-primary);flex-shrink:0}.module-view-lesson-skeleton .lesson-content{flex:1;display:flex;flex-direction:column}.module-view-lesson-skeleton .skeleton-title{height:24px;width:70%;border-radius:var(--radius-xs)}.module-view-lesson-skeleton .skeleton-description{height:16px;width:100%;border-radius:var(--radius-xs)}.module-view-lesson-skeleton .skeleton-status{height:20px;width:120px;border-radius:var(--radius-xs);margin-top:var(--spacing-xs)}.module-view-lesson-skeleton .lesson-actions{flex-shrink:0}.module-view-lesson-skeleton .skeleton-button{height:40px;width:100px;border-radius:var(--radius-sm)}.skeleton{background:linear-gradient(90deg,var(--skeleton-base,#e0e0e0) 0,var(--skeleton-shine,#f0f0f0) 50%,var(--skeleton-base,#e0e0e0) 100%);background-size:200% 100%;animation:skeleton-shine 1.5s ease-in-out infinite}@keyframes skeleton-shine{0%{background-position:-200% 0}100%{background-position:200% 0}}[data-theme=dark] .skeleton{--skeleton-base:#2a2a2a;--skeleton-shine:#333333}#left-sidebar .nav-module{margin-bottom:var(--spacing-md)}#left-sidebar .nav-module .module-header{display:flex;align-items:center;cursor:pointer;margin-bottom:var(--spacing-sm)}#left-sidebar .nav-module .module-info{flex-grow:1;min-width:0}#left-sidebar .nav-module .module-title{font-weight:400;font-size:var(--text-md);line-height:1.4;margin:0;overflow:hidden;white-space:nowrap;letter-spacing:var(--ls-lg)}#left-sidebar .nav-module .module-toggle{background:0 0;border:none;padding:0;cursor:pointer;line-height:1;display:flex;align-items:center;flex-shrink:0}#left-sidebar .nav-module .toggle-icon{width:1rem;height:1rem;transition:transform .2s ease;align-self:center}#left-sidebar .nav-module.expanded .toggle-icon{transform:rotate(90deg)}#left-sidebar svg{stroke:currentColor!important}#left-sidebar .nav-module .module-lessons{display:none!important;padding:0;overflow:hidden;background:var(--lesson-bg);margin-top:var(--spacing-xs)}#left-sidebar .nav-module.expanded .module-lessons{display:block!important}#left-sidebar .module-lessons.expanded{display:block!important}#left-sidebar .nav-lesson{padding:0;cursor:pointer;height:2.5rem;display:flex;border-radius:9px;margin-bottom:var(--spacing-xs);background:0 0;border:1px solid transparent;transition:all .2s ease;position:relative;margin-left:2px;margin-right:2px}#left-sidebar .nav-lesson:hover{border:1px solid var(--border-color);opacity:1!important;padding-left:1.5rem}#left-sidebar .nav-lesson.current{color:var(--text-primary);position:relative;box-shadow:0 0 1px 0 #0072ff;border:1px solid rgba(0,114,255,.5);padding-left:1.5rem}#left-sidebar .nav-lesson.current::before{content:'';position:absolute;left:.65rem;top:1.25rem;transform:translateY(-50%);width:.25rem;height:.25rem;background:var(--active-green);border-radius:50%;animation:pulse-dot 3.5s ease-in-out infinite}@keyframes pulse-dot{0%,100%{opacity:.3;transform:translateY(-50%) scale(1)}50%{opacity:1;transform:translateY(-50%) scale(1.15)}}#left-sidebar .nav-lesson.completed{opacity:.75}#left-sidebar .lesson-title-row{display:flex;align-items:center;width:100%;min-width:0;margin:0}#left-sidebar .lesson-title{font-size:var(--text-md);line-height:normal;color:var(--text-secondary);overflow:hidden;text-overflow:ellipsis;white-space:nowrap;display:flex;align-items:center;flex:1;height:2.25rem}#left-sidebar .lesson-title .marquee-text{padding:.69rem 0;margin:-.69rem 0}#left-sidebar .lesson-title svg{width:1em;height:1em;vertical-align:middle;margin-top:-2px;margin-right:7px}#left-sidebar .lesson-progress-indicator{flex-shrink:0;width:1.2rem;height:1.2rem;display:flex;align-items:center;justify-content:center}#left-sidebar .circular-progress-sidebar{position:relative;width:1.2rem;height:1.2rem;display:flex;align-items:center;justify-content:center}#left-sidebar .progress-circle{width:1.2rem;height:1.2rem;transform:rotate(-90deg);position:absolute;top:0;left:0}#left-sidebar .progress-circle-bg{fill:none;stroke:var(--border-color);stroke-width:2;opacity:.6}#left-sidebar .progress-circle-fill{fill:none;stroke:var(--primary-color);stroke-width:2;stroke-linecap:round;transition:stroke-dashoffset .3s ease}#left-sidebar .circular-progress-sidebar[data-progress="0"] .progress-circle-fill{opacity:0}#left-sidebar .title-check-icon{width:1rem;height:1rem;color:var(--success-color);flex-shrink:0}.lessons-loading{padding:var(--spacing-md);text-align:center;color:var(--text-secondary);font-size:var(--font-size-sm)}.lessons-loading.active{display:flex;align-items:center;justify-content:center;gap:var(--spacing-sm)}.lessons-loading .loading-icon{width:16px;height:16px;animation:spin 1s linear infinite}@keyframes spin{0%{transform:rotate(0)}100%{transform:rotate(360deg)}}.lessons-error{padding:var(--spacing-md);text-align:center;color:var(--color-danger);font-size:var(--font-size-sm)}.lessons-error p{margin:0 0 var(--spacing-sm) 0}.lessons-error .retry-btn{padding:var(--spacing-xs) var(--spacing-sm);background:var(--color-danger);color:#fff;border:none;border-radius:var(--radius-sm);font-size:var(--font-size-xs);cursor:pointer;transition:opacity .2s ease}.lessons-error .retry-btn:hover{opacity:.8}.no-lessons{padding:var(--spacing-md);text-align:center;color:var(--text-secondary);font-size:var(--font-size-sm);font-style:italic}.lesson-practice-container{width:100%;max-width:100%;position:relative;overflow:visible;min-height:400px}.practice-question{width:100%}.question-header-nav{display:flex;align-items:center;justify-content:space-between;margin-bottom:1rem;flex-wrap:wrap;gap:1rem}.question-header-nav h3{margin:0}.question-nav-buttons{display:flex;align-items:center;gap:.75rem}.question-nav-buttons .bttn{display:flex;align-items:center;justify-content:center}.question-nav-buttons .bttn:disabled{opacity:.5;cursor:not-allowed}.question-meta-wrapper{display:inline-flex;align-items:center;gap:.5rem;margin-bottom:1.5rem}.question-meta-wrapper .meta-divider::before{content:"•";color:var(--text-tertiary-color);font-weight:700}.question-meta-wrapper .attempts-count{color:var(--text-tertiary-color);font-size:var(--text-sm)}.question-type-badge{display:inline-flex;align-items:center;justify-content:center;padding:var(--badge-padding-y) var(--badge-padding-x);font-size:var(--text-sm);font-weight:600;letter-spacing:var(--ls-base);border-radius:5px;line-height:normal}.question-type-badge.mcq{background:color-mix(in srgb,var(--brand-color) 15%,transparent);color:var(--brand-color);border:1px solid color-mix(in srgb,var(--brand-color) 25%,transparent)}.question-type-badge.frq{background:color-mix(in srgb,var(--active-green) 15%,transparent);color:var(--active-green);border:1px solid color-mix(in srgb,var(--active-green) 25%,transparent)}.question-type-badge.gq{background:color-mix(in srgb,#ff6b35 15%,transparent);color:#ff6b35;border:1px solid color-mix(in srgb,#ff6b35 25%,transparent)}.question-navigation{display:flex;align-items:center;justify-content:space-between;margin-bottom:2rem}.nav-btn{display:flex;align-items:center;gap:.5rem;min-width:100px}.nav-btn:disabled{opacity:.5;cursor:not-allowed}.question-progress{font-size:var(--text-sm);font-weight:500;color:var(--text-secondary-color);letter-spacing:var(--ls-sm)}.question-content{margin-bottom:2rem}[data-theme=dark] .question-images{background:#000;padding:1.5rem;border-radius:12px}.question-text{font-size:var(--text-base);color:var(--text-primary-color);margin-bottom:1.5rem}.choice-images,.part-images,.question-images{display:flex;flex-direction:column;gap:1rem;margin:1.5rem 0}.choice-image,.part-image,.question-image{max-width:100%;height:auto;border-radius:12px;align-self:center}.mcq-choices{display:flex;flex-direction:column;gap:1.5rem;margin-top:1.5rem;margin-bottom:3rem}.mcq-choice{display:flex;align-items:flex-start;gap:1.5rem;padding:.55rem 2rem;border:.5px solid var(--input-border-color);box-shadow:-1px 1px 0 1px var(--shadow-border);border-radius:12px;cursor:pointer;transition:all .3s cubic-bezier(.4, 0, .2, 1);position:relative;overflow:hidden}.mcq-choice p{margin:0;line-height:1.6rem}.mcq-choice:hover{border-color:var(--brand-light)!important;transform:translateY(2px);box-shadow:0 4px 12px color-mix(in srgb,var(--brand-color) 15%,transparent)}.mcq-choice:has(.mcq-input:checked){border-color:var(--brand-color);box-shadow:0 0 0 3px color-mix(in srgb,var(--brand-color) 20%,transparent),0 4px 12px color-mix(in srgb,var(--brand-color) 15%,transparent);transform:translateY(1px)}.mcq-choice:has(.mcq-input:checked)::before{opacity:1}.mcq-input{flex-shrink:0;margin:0;accent-color:var(--brand-color);width:1rem;height:1rem;cursor:pointer;align-self:center}.choice-text{flex:1;font-size:var(--text-base)}.frq-parts{display:flex;flex-direction:column;gap:2rem;margin:1.5rem 0}.frq-meta{display:flex;align-items:center;gap:1rem}.frq-label{font-size:var(--text-base);font-weight:600;color:var(--text-primary-color);letter-spacing:var(--ls-md)}.frq-points{font-size:var(--text-sm);color:var(--text-tertiary-color);background:var(--card-bg-color);padding:.25rem .5rem;border-radius:6px;border:1px solid var(--input-border-color);transition:all .2s ease;letter-spacing:var(--ls-lg)}.part-question{font-size:var(--text-base);line-height:1.6;color:var(--text-primary-color);margin-bottom:1rem}.frq-answer,.gq-answer-input{display:flex;width:100%;min-height:120px;max-height:300px;overflow-y:auto;padding:.75rem;border:1px solid transparent;border-radius:10px;font-family:inherit;font-size:var(--text-base);line-height:2;color:var(--text-primary-color);background:0 0;resize:vertical;transition:all .3s ease;border:.5px solid var(--border-color)}.gq-answer-input{box-shadow:-1px 1px 0 1px var(--shadow-border)}.frq-answer:focus,.gq-answer-input:focus{outline:0;border-color:var(--brand-light);box-shadow:0 0 0 2px color-mix(in srgb,var(--brand-color) 20%,transparent)}.frq-answer::placeholder,.gq-answer-input::placeholder{color:var(--text-tertiary-color)}.gq-answer{margin:1.5rem 0}.practice-question .incorrect{border-color:#ee1c1c!important;background:linear-gradient(169deg,color-mix(in srgb,#ee1c1c 8%,var(--bg-color)) 0,color-mix(in srgb,#ee1c1c 4%,var(--bg-color)) 55%,transparent 100%)!important;box-shadow:0 0 12px 0 color-mix(in srgb,#ee1c1c 20%,transparent)!important;color:#ee1c1c!important}.practice-question .correct{border-color:var(--active-green)!important;background:linear-gradient(169deg,color-mix(in srgb,var(--active-green) 8%,var(--bg-color)) 0,color-mix(in srgb,var(--active-green) 4%,var(--bg-color)) 55%,transparent 100%)!important;box-shadow:0 0 12px 0 color-mix(in srgb,var(--active-green) 20%,transparent)!important;color:var(--active-green)!important}.practice-question .partial{border-color:#f3a31a!important;background:linear-gradient(169deg,color-mix(in srgb,#f3a31a 8%,var(--bg-color)) 0,color-mix(in srgb,#f3a31a 4%,var(--bg-color)) 55%,transparent 100%)!important;box-shadow:0 0 12px 0 color-mix(in srgb,#f3a31a 20%,transparent)!important;color:#f3a31a!important}.question-actions{display:flex;align-items:center;justify-content:flex-start;flex-wrap:wrap;gap:1rem}.lesson-practice-container .bttn{min-height:2.5rem;min-width:2.5rem}.bttn .animate-spin{animation:spin 1s linear infinite}.question-feedback{margin:1.5rem 0;padding:1.5rem;border-radius:12px;border:1px solid var(--input-border-color);background:var(--bg-color);font-size:var(--text-base)}.feedback-status{display:flex;align-items:center;gap:.75rem;flex-wrap:wrap}.status-text{font-size:var(--text-base);font-weight:500;letter-spacing:var(--ls-md)}.score-text{font-size:var(--text-sm);color:var(--text-secondary-color);margin-left:auto}.feedback-content{padding-top:1rem;border-top:1px solid var(--input-border-color);margin-top:1rem}.question-explanation{margin-top:2rem}.explanation-content{display:flex;flex-direction:column;gap:1.5rem}.answer-text{border:2px dashed var(--shadow-border);border-radius:12px;padding-left:2rem}.answer-text ol,.answer-text ul{list-style-type:lower-alpha;margin:1rem 0}.collapsible-section{box-shadow:0 0 1px 1px var(--shadow-border);border:.5px solid transparent;border-radius:12px;transition:all .3s cubic-bezier(.4, 0, .2, 1)}.collapsible-section.is-expanded{box-shadow:-.5px .5px 0 .5px var(--shadow-border);border:.5px solid var(--border-color)}.collapsible-section--answer.is-expanded,.collapsible-section--explanation.is-expanded{box-shadow:0 0 1px 1px transparent;border:.5px solid transparent;border-radius:12px!important;overflow:visible!important}.collapsible-header{display:flex;align-items:center;padding:1rem 1.5rem;justify-content:space-between;flex-wrap:wrap;gap:.5rem;cursor:pointer;transition:all .3s cubic-bezier(.4, 0, .2, 1);user-select:none}.collapse-icon{width:20px;height:20px;color:var(--text-muted-color);transition:transform .3s cubic-bezier(.4, 0, .2, 1),color .2s ease}.collapsible-section:not(.is-expanded) .collapse-icon[data-lucide=chevron-up]{transform:rotate(180deg)}.collapsible-header:hover .collapse-icon{color:var(--text-primary-color)}.collapsible-content{overflow:hidden;transition:max-height .4s cubic-bezier(.4, 0, .2, 1),opacity .3s cubic-bezier(.4, 0, .2, 1),padding .3s cubic-bezier(.4, 0, .2, 1)}.collapsible-content.is-expanded{max-height:fit-content;opacity:1;overflow:visible!important;padding:1.25rem}.collapsible-content.is-collapsed{max-height:0;opacity:0;padding:0;border:none!important}.collapsible-section--answer .collapsible-content.is-expanded,.collapsible-section--explanation .collapsible-content.is-expanded{margin:0;overflow:visible!important;max-width:none!important}.lesson-practice-error{display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:3rem 2rem;background:var(--card-bg-color);border-radius:12px;border:1px solid var(--input-border-color);margin:2rem 0}.lesson-practice-error .error-icon{width:48px;height:48px;color:var(--text-tertiary-color);margin-bottom:1rem}.lesson-practice-error h3{font-size:var(--text-lg);font-weight:500;color:var(--text-primary-color);margin-bottom:.5rem;letter-spacing:var(--ls-md)}.lesson-practice-error p{font-size:var(--text-base);color:var(--text-secondary-color);margin-bottom:1.5rem;max-width:400px}.question-explanation{scrollbar-width:thin;scrollbar-color:var(--text-tertiary-color) var(--card-bg-color)}.question-explanation::-webkit-scrollbar{height:8px}.question-explanation::-webkit-scrollbar-track{background:var(--card-bg-color);border-radius:4px}.question-explanation::-webkit-scrollbar-thumb{background:var(--text-tertiary-color);border-radius:4px}.question-explanation::-webkit-scrollbar-thumb:hover{background:var(--text-secondary-color)}.practice-loading-state{position:absolute;top:0;left:0;right:0;bottom:0;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;min-height:400px;z-index:10}.practice-loading-state[style*="display: none"]{display:none!important;visibility:hidden!important;z-index:-1!important}.practice-loading-state .loading-spinner{width:24px;height:24px;border:2px solid var(--input-border-color);border-top:2px solid var(--text-primary-color,#fff);border-radius:50%;animation:spin 1s linear infinite;flex-shrink:0;margin:0 auto}@keyframes spin{0%{transform:rotate(0)}100%{transform:rotate(360deg)}}.practice-loading-state p{margin:.5rem 0;color:var(--text-tertiary-color);font-size:var(--text-base)!important;font-weight:400;letter-spacing:var(--ls-sm)}.practice-error-state{position:absolute;top:0;left:0;right:0;bottom:0;display:flex;flex-direction:column;align-items:center;justify-content:center;background:var(--card-bg-color);text-align:center;min-height:400px;z-index:10}.practice-error-state[style*="display: none"]{display:none!important;visibility:hidden!important;z-index:-1!important}.practice-error-state .error-icon{font-size:3rem;margin-bottom:1rem;opacity:.7}.practice-error-state p{margin:0 0 1.5rem 0;color:var(--text-secondary-color);font-size:var(--text-base)}.practice-error-state .retry-practice-btn{margin:0}.practice-content-container{position:relative;width:100%;height:100%;min-height:400px;z-index:1}.explanation-content,.question-explanation{overflow:visible!important}.table-breakout-wrapper{position:relative;margin:0 0 1rem 0;max-width:100%;overflow-x:auto;overflow-y:visible}.table-breakout-wrapper.scrollable{padding:15px 10px 30px 10px}.table-breakout-wrapper table{margin:0 auto;width:100%;max-width:100%}@media (min-width:1100px){.table-breakout-wrapper{margin:0 calc(-1 * min(6rem,12vw)) 1.5rem;max-width:min(1200px,90vw);overflow-x:visible}}@media (max-width:1099px){.table-breakout-wrapper table{min-width:950px}}.table-scroll-indicator{position:absolute;top:0;left:1.5rem;font-size:var(--text-sm);color:var(--text-muted-color);background:0 0;padding:0;line-height:1;opacity:0;transition:opacity .3s ease;pointer-events:none;z-index:10}.table-breakout-wrapper.scrollable:hover .table-scroll-indicator{opacity:.9}.feedback-actions{margin-top:1rem;display:flex;gap:.75rem;align-items:center}.retry-question-btn{background:var(--card-bg-color);border:1px solid var(--input-border-color);color:var(--text-primary-color);transition:all .2s ease}.retry-question-btn:hover{background:var(--card-hover-bg-color);border-color:var(--text-secondary-color);transform:translateY(-1px)}.part-feedback-display{margin-top:1rem;padding-left:1rem;border-left:2px solid var(--text-secondary-color);font-size:var(--text-base);line-height:1.8;color:var(--text-secondary-color)}.part-feedback-display p{margin:0 0 .5rem 0}.part-feedback-display p:last-child{margin-bottom:0}.practice-input-wrapper{position:relative;width:100%}.practice-input-wrapper.drag-over{border-radius:5px;outline:2px dashed rgba(168,85,247,.6);outline-offset:.75rem;background:linear-gradient(120deg,rgba(34,211,238,.08) 0,rgba(168,85,247,.06) 25%,rgba(251,146,60,.05) 50%,rgba(250,204,21,.06) 75%,rgba(34,197,94,.08) 100%);position:relative}.practice-input-wrapper.drag-over::before{content:'';position:absolute;inset:0;background:linear-gradient(120deg,rgba(165,243,252,.25) 0,rgba(196,181,253,.2) 33%,rgba(254,215,170,.15) 66%,rgba(187,247,208,.2) 100%);backdrop-filter:blur(2px);border-radius:10px;pointer-events:none;z-index:5}[data-theme=dark] .practice-input-wrapper.drag-over::before{background:linear-gradient(120deg,rgba(6,182,212,.15) 0,rgba(124,58,237,.12) 33%,rgba(251,146,60,.08) 66%,rgba(52,211,153,.12) 100%)}.practice-input-wrapper.drag-over::after{content:'↓ Drop images here';position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);color:var(--text-primary-color);font-weight:500;font-size:var(--text-lg);letter-spacing:var(--ls-sm);pointer-events:none;z-index:100;padding:.5rem 1rem}.practice-input-wrapper .frq-answer,.practice-input-wrapper .gq-answer-input{padding-bottom:3.5rem}.practice-toolbar-floating{position:absolute;bottom:.75rem;left:.75rem;right:.75rem;display:flex;align-items:center;justify-content:space-between;pointer-events:none;z-index:5}.toolbar-word-pill{background:rgba(255,255,255,.25);backdrop-filter:blur(5px);padding:.35rem .75rem;font-size:var(--text-xs);border-radius:50px;font-weight:300;color:var(--text-tertiary-color);box-shadow:0 0 0 1px var(--shadow-border);pointer-events:auto;transition:all .2s ease;transform:scale(.9);opacity:0;align-self:end}.practice-input-wrapper:focus-within .toolbar-word-pill{opacity:1;transform:scale(1)}[data-theme=dark] .toolbar-word-pill{background:rgba(30,30,30,.25)}.toolbar-word-pill.approaching-limit{color:#ef8000;background:rgba(255,180,0,.15);backdrop-filter:blur(8px);border:1px solid #ef8000;box-shadow:none;animation:pulse .5s ease}.toolbar-word-pill.over-limit{color:#ff3e3e;background:rgba(255,62,62,.2);backdrop-filter:blur(8px);border:1px solid #ff3e3e;box-shadow:none;animation:pulse .5s ease}@keyframes pulse{0%,100%{transform:scale(1)}50%{transform:scale(1.05)}}.toolbar-image-section{display:flex;align-items:center;gap:.75rem;pointer-events:auto}.toolbar-image-pills{display:none;gap:.7rem;transition:all .3s ease}.toolbar-image-thumb{position:relative;width:50px;height:50px;border-radius:30%;overflow:visible;cursor:pointer;transition:all .2s ease;flex-shrink:0;box-shadow:0 0 0 1px var(--shadow-border)}.toolbar-image-thumb:hover{transform:scale(1.1)}.toolbar-image-thumb img{width:100%;height:100%;object-fit:cover;border-radius:30%}.toolbar-remove-btn{position:absolute;top:-4px;right:-4px;width:18px;height:18px;background:#dc2626;color:#fff;border:2px solid #fff;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:12px;line-height:1;cursor:pointer;opacity:0;transform:scale(.8);transition:all .2s ease}.toolbar-image-thumb:hover .toolbar-remove-btn{opacity:1;transform:scale(1)}.toolbar-upload-btn{width:48px;height:48px;border-radius:50%;min-width:48px;background:rgba(255,255,255,.25)!important;backdrop-filter:blur(5px);border:none!important;box-shadow:0 0 0 1px var(--shadow-border)!important;transition:all .2s cubic-bezier(.68, -.55, .265, 1.55)!important;position:relative;overflow:visible}[data-theme=dark] .toolbar-upload-btn{background:rgba(30,30,30,.25)!important}.toolbar-upload-btn:hover{transform:scale(1.1);background:rgba(255,255,255,.35)!important;box-shadow:0 0 0 1px var(--brand-light),0 4px 12px rgba(168,85,247,.2)!important}[data-theme=dark] .toolbar-upload-btn:hover{background:rgba(50,50,50,.35)!important}.toolbar-upload-btn:active{transform:scale(.92);transition:all .1s cubic-bezier(.68, -.55, .265, 1.55)!important}.toolbar-upload-btn::after{content:'';position:absolute;top:50%;left:50%;width:100%;height:100%;border-radius:50%;background:radial-gradient(circle,rgba(168,85,247,.3) 0,transparent 70%);transform:translate(-50%,-50%) scale(0);opacity:0;transition:all .5s cubic-bezier(.68, -.55, .265, 1.55);pointer-events:none}.toolbar-upload-btn:active::after{transform:translate(-50%,-50%) scale(2);opacity:1;transition:all .3s ease-out}.toolbar-upload-btn svg{width:22px;height:22px;position:relative;z-index:1}.toolbar-lightbox{display:none;position:fixed;top:0;left:0;right:0;bottom:0;background:rgba(0,0,0,.7);backdrop-filter:blur(4px);z-index:10000;cursor:pointer;align-items:center;justify-content:center}.toolbar-lightbox.active{display:flex;animation:fadeIn .2s ease}.toolbar-lightbox img{max-width:90%;max-height:90vh;border-radius:8px;animation:zoomIn .3s ease;cursor:default}.lightbox-close{position:absolute;top:2rem;right:2rem;width:40px;height:40px;background:rgba(255,255,255,.1);border:2px solid #fff;border-radius:50%;display:flex;align-items:center;justify-content:center;color:#fff;font-size:24px;font-weight:300;cursor:pointer;transition:all .2s ease}.lightbox-close:hover{background:rgba(255,255,255,.2);transform:rotate(90deg)}@keyframes fadeIn{from{opacity:0}to{opacity:1}}@keyframes zoomIn{from{transform:scale(.8);opacity:0}to{transform:scale(1);opacity:1}}@media (max-width:640px){.toolbar-word-pill{font-size:var(--text-xxs)}.toolbar-upload-btn{scale:0.95}.practice-input-wrapper .frq-answer,.practice-input-wrapper .gq-answer-input{padding-bottom:5rem}}.toolbar-upload-btn.uploading{pointer-events:none;opacity:.5;cursor:not-allowed}.toolbar-image-thumb.uploading{pointer-events:none}.toolbar-image-thumb.uploading::before{content:'';position:absolute;top:0;left:0;width:100%;height:100%;background:rgba(255,255,255,.9);border-radius:30%;z-index:5}.toolbar-image-thumb.uploading::after{content:'';position:absolute;top:12px;left:12px;width:20px;height:20px;border:3px solid rgba(0,0,0,.1);border-top:3px solid var(--brand-color);border-radius:50%;animation:spin .8s linear 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rgba(0,0,0,.04)}.courses-skeleton-thumbnail{width:100%;height:180px;background-color:var(--border-color);background:var(--border-color)!important;animation:none!important}.courses-skeleton-status-badge{position:absolute;top:var(--spacing-sm);right:var(--spacing-sm);width:70px;height:20px;border-radius:.375rem;z-index:2}.courses-skeleton-body{padding:var(--spacing-md);display:flex;flex-direction:column;flex-grow:1}.courses-skeleton-course-title{height:28px;width:85%;margin-bottom:var(--spacing-sm);border-radius:.5rem}.courses-skeleton-meta{display:flex;flex-wrap:wrap;align-items:center;gap:var(--spacing-md);margin-bottom:var(--spacing-sm);font-size:.9375rem}.courses-skeleton-meta-icon{width:24px;height:24px;border-radius:50%;flex-shrink:0}.courses-skeleton-circular-progress{width:24px;height:24px;border-radius:50%;flex-shrink:0}.courses-skeleton-footer{display:flex;flex-direction:column;gap:var(--spacing-sm);margin-top:auto}.courses-skeleton-actions{display:flex;gap:var(--spacing-xs)}.courses-skeleton-action-btn{height:40px;width:100%;border-radius:.5rem}@media (max-width:768px){.courses-skeleton-card{max-width:none}.courses-skeleton-header{text-align:left}.courses-skeleton-title{margin-left:0}.courses-skeleton-subtitle{margin-left:0}}h1,h2,h3,h4,h5,h6{font-family:Geist,-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,Oxygen,Ubuntu,Cantarell,'Open Sans','Helvetica Neue',sans-serif}body{font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,Oxygen,Ubuntu,Cantarell,'Open Sans','Helvetica Neue',sans-serif;color:var(--text-primary)}h1{font-size:clamp(1.8rem, 4vw, 2.2rem);font-weight:600;letter-spacing:var(--ls-xs);margin-top:.5rem}h2{font-size:clamp(1.5rem, 3.5vw, 1.8rem);font-weight:600;letter-spacing:var(--ls-sm)}h3{font-size:clamp(1.15rem, 2.5vw, 1.3rem);font-weight:600}h4{font-size:clamp(1.05rem, 2.25vw, 1.15rem);font-weight:500;display:flex;align-items:center;gap:1rem}h5{font-size:clamp(1rem, 2vw, 1.1rem);font-weight:500}h6{font-size:clamp(.9rem, 1.8vw, 1rem);font-weight:500;text-transform:uppercase;letter-spacing:.05em}.lesson-video-container{width:100%;max-width:100%;margin:2rem 0;background:var(--bg-color,#000);position:relative;border-radius:12px;overflow:hidden;padding-top:56.25%}.video-loading-state{position:absolute;top:0;left:0;right:0;bottom:0;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center}.video-loading-state .loading-spinner{width:24px;height:24px;border:2px solid var(--input-border-color);border-top:2px solid var(--text-primary-color,#fff);border-radius:50%;animation:spin 1s linear infinite;flex-shrink:0;margin:0 auto}@keyframes spin{0%{transform:rotate(0)}100%{transform:rotate(360deg)}}.video-loading-state p{margin:.5rem 0;color:var(--text-tertiary-color);font-size:var(--text-base)!important;font-weight:400;letter-spacing:var(--ls-sm)}.video-error-state{position:absolute;top:0;left:0;right:0;bottom:0;display:flex;flex-direction:column;align-items:center;justify-content:center;background:var(--bg-color,#000);text-align:center}.video-error-state .error-icon{font-size:3rem;margin-bottom:1rem;opacity:.7}.video-error-state p{margin:0 0 1.5rem 0;color:var(--text-secondary-color);font-size:1rem}.video-error-state .retry-video-btn{margin:0}.video-player-container{position:absolute;top:0;left:0;width:100%;height:100%;background:var(--bg-color,#000)}.video-player-container iframe{width:100%;height:100%;border:none;border-radius:12px;display:block}.video-controls-bar{display:flex;justify-content:center;align-items:center;gap:1rem;border:1px solid var(--input-border-color);border-radius:100px;padding:.38rem .5rem;width:fit-content;align-self:center;margin:0 auto}.video-controls-bar .bttn{border-radius:100%}.video-controls-bar svg{width:1.35rem;height:1.35rem}.theater-mode-popup{width:95vw!important;max-width:95vw!important;height:82vh!important;max-height:82vh!important;padding:0!important;background:var(--bg-color)!important;border-radius:12px!important;overflow:hidden}.theater-mode-popup .video-player-container{height:100%}.theater-mode-popup .video-player-container iframe{height:100%;border-radius:12px}.theater-close-btn{position:absolute!important;top:1rem!important;right:1rem!important;z-index:10!important;border:.5px solid rgba(255,255,255,.25)!important;background:rgba(0,0,0,.25)!important;backdrop-filter:blur(8px)}.theater-close-btn:hover{border-color:rgba(255,255,255,.4)!important}.theater-mode-placeholder{width:100%;height:100%;display:flex;align-items:center;justify-content:center;background:var(--bg-color);color:var(--text-primary-color);border-radius:12px;padding:2rem;text-align:center}.video-component-container{width:100%}.component-header{margin-bottom:.5rem}.component-title{font-size:var(--text-base);font-weight:500;color:var(--text-primary-color);margin-top:2rem;margin-bottom:.5rem;letter-spacing:var(--ls-md)}.component-instructions{text-align:left;font-size:var(--text-sm);color:var(--text-tertiary-color);padding:0}.timeline-wrapper{display:flex;align-items:center;gap:1rem;padding:2rem .5rem}.timeline-start-icon{flex-shrink:0;color:var(--text-tertiary-color);display:flex;align-items:center}.bookmark-timeline{flex:1;height:50px;display:flex;align-items:center;position:relative}.bookmark-timeline-track{width:100%;height:5px;background:var(--contrast-light-color);border-radius:3px;position:relative;transition:background .3s ease}.timeline-end-timestamp{flex-shrink:0;font-size:var(--text-xs);color:var(--text-tertiary-color);font-weight:500}.stats-content-wrapper{border:dashed var(--input-border-color);border-width:0 0 0 1px;padding:1rem;margin:2rem 0}.stats-content .stats-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(100px,125px));gap:1rem;padding:0 .75rem}.stats-content .stat-item{display:flex;flex-direction:column;gap:.75rem}.stats-content .stat-label{overflow-wrap:break-word;white-space:normal;color:var(--text-tertiary-color);font-size:var(--text-xs);letter-spacing:var(--ls-sm)}.stats-content .stat-value{color:var(--text-primary-color);font-size:var(--text-2xl);font-weight:600;letter-spacing:var(--ls-md)}.timeline-toggle-btn.active{background:var(--brand-light);color:var(--brand-color);border-color:var(--brand-color)}.stats-toggle-btn.active{background:var(--brand-light);color:var(--brand-color);border-color:var(--brand-color)}.bookmark-dot{position:absolute!important;width:12px;height:12px;background:0 0;border:none;border-radius:50%;top:-4px;transform:translateX(-50%);cursor:pointer;transition:none}.bookmark-dot::before{content:'';position:absolute;top:0;left:0;width:100%;height:100%;background:var(--brand-color);border:1px solid #fff;border-radius:50%;transition:all .2s ease;box-shadow:0 0 20px 2px rgba(0,85,255,.35)}.bookmark-dot:hover::before{transform:scale(1.4);box-shadow:0 0 0 8px rgba(0,114,255,.15),0 2px 4px rgba(0,0,0,.2)}.replay-segment-dot::before{background:#e74c3c;box-shadow:0 0 20px 2px rgba(231,76,60,.35)}.replay-segment-dot:hover::before{transform:scale(1.4);box-shadow:0 0 0 8px rgba(231,76,60,.15),0 2px 4px rgba(0,0,0,.2)}.bookmark-dot:hover{z-index:100!important}.bookmark-dot:active::before{transform:scale(1.2)}.bookmark-btn.success{animation:bookmarkSuccess .5s ease}@keyframes bookmarkSuccess{0%{transform:scale(1)}50%{transform:scale(1.2);color:var(--active-green);background:rgba(34,197,94,.1)}100%{transform:scale(1)}}.bookmark-context-menu{position:fixed;background:var(--card-bg-color);border:1px solid var(--input-border-color);border-radius:8px;padding:.25rem;box-shadow:var(--shadow-lg);z-index:1000;min-width:160px;animation:menuSlideIn .15s ease}@keyframes menuSlideIn{from{opacity:0;transform:translateY(-8px)}to{opacity:1;transform:translateY(0)}}.bookmark-context-menu .context-menu-item{width:100%;text-align:left;padding:.5rem .75rem;border-radius:6px;font-size:var(--text-sm);display:flex;align-items:center;gap:.5rem;transition:all .15s ease;color:var(--text-secondary-color)}.bookmark-context-menu .context-menu-item:hover{background:var(--hover-100);color:var(--text-primary-color)}.bookmark-context-menu .context-menu-item i{width:14px;height:14px}@media (max-width:768px){.component-instructions{font-size:calc(var(--text-xs) * .9)}.timeline-wrapper{padding:0 .25rem}}