#right-sidebar{grid-area:right-sidebar;background-color:var(--sidebar-bg);border-left:1px solid var(--border-color);overflow-y:auto;overflow-x:visible;transition:width .3s ease;position:relative;margin:0;z-index:10;box-sizing:border-box}@media (min-width:769px){#right-sidebar .sidebar-close-btn{display:none!important}}#right-sidebar:not(.collapsed){border-left:1px solid var(--border-color)}@media (max-width:768px){#right-sidebar{position:fixed;top:var(--header-height);right:0;height:calc(100vh - var(--header-height) - var(--control-bar-height));width:100vw;z-index:1100;transform:translateX(0);transition:transform .3s ease!important;box-shadow:-2px 0 10px rgba(0,0,0,.2)}#right-sidebar.collapsed{transform:translateX(100%)}#right-sidebar .sidebar-resize-handle{display:none}#right-sidebar .sidebar-close-btn{display:flex!important;position:absolute;left:1rem;top:50%;transform:translateY(-50%);z-index:1001;background:rgba(255,255,255,.1);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border:1px solid rgba(255,255,255,.18);box-shadow:0 8px 32px 0 rgba(31,38,135,.37);width:40px;height:40px;border-radius:50%;align-items:center;justify-content:center;cursor:pointer;transition:all .3s cubic-bezier(.4, 0, .2, 1)}#right-sidebar .sidebar-close-btn:hover{background:rgba(255,255,255,.2);transform:translateY(-50%) scale(1.1);box-shadow:0 12px 40px 0 rgba(31,38,135,.5)}[data-theme=dark] #right-sidebar .sidebar-close-btn{background:rgba(0,0,0,.3);border:1px solid rgba(255,255,255,.1);box-shadow:0 8px 32px 0 rgba(0,0,0,.37)}[data-theme=dark] #right-sidebar .sidebar-close-btn:hover{background:rgba(0,0,0,.5)}#right-sidebar .sidebar-close-btn i{width:20px;height:20px;color:var(--text-primary)}}@media (min-width:769px){#right-sidebar.collapsed{width:0!important;min-width:0!important;padding:0!important;overflow:hidden;margin:0;border:none}}#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}#main-layout.right-collapsed{grid-template-columns:var(--sidebar-width) 1fr 0}#main-layout.left-collapsed.right-collapsed{grid-template-columns:0 1fr 0}#right-sidebar.collapsed .sidebar-resize-handle{display:none}:root{--apps-header-bg:rgba(255, 255, 255, 0.95);--apps-header-border:var(--input-border-color);--apps-header-shadow:0 2px 8px 2px rgba(0, 0, 0, 0.08);--apps-tab-text:var(--text-secondary-color);--apps-tab-hover-bg:rgba(0, 0, 0, 0.06);--apps-tab-hover-text:var(--text-primary-color);--apps-tab-active-bg:var(--bg-color);--apps-tab-active-text:var(--brand-color)}[data-theme=dark]{--apps-tab-text:rgba(255, 255, 255, 0.6);--apps-tab-hover-text:rgba(255, 255, 255, 0.9);--apps-tab-active-text:var(--brand-color)}[data-theme=dark] .apps-header::after{background:rgba(0,0,0,.2);box-shadow:inset 1px 1px 1px 0 rgba(255,255,255,.1),inset -1px -1px 1px 0 rgba(255,255,255,.05)}#right-sidebar{position:relative}.apps-header{position:absolute;top:.5rem;left:50%;transform:translateX(-50%);min-width:300px;display:flex;align-items:center;justify-content:center;padding:.75rem .5rem;gap:.5rem;overflow:hidden;z-index:1000;border-radius:14px;box-shadow:0 2px 6px rgba(0,0,0,.1),0 0 10px rgba(0,0,0,.05)}.apps-header::before{content:'';position:absolute;z-index:0;inset:0;backdrop-filter:blur(3px);-webkit-backdrop-filter:blur(3px);overflow:hidden}.apps-header::after{content:'';z-index:1;border-radius:14px;position:absolute;inset:0;background:rgba(255,255,255,.15);box-shadow:inset 1px 1px 1px 0 rgba(255,255,255,.3),inset -1px -1px 1px 0 rgba(255,255,255,.2)}.app-tab{font-family:Geist,-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,'Helvetica Neue',Arial,sans-serif;padding:calc(var(--bttn-padding-y) * .8) calc(var(--bttn-padding-x) * .9);border-radius:12px;background:0 0;border:none;cursor:pointer;display:flex;align-items:center;transition:all .3s cubic-bezier(.4, 0, .2, 1);color:var(--apps-tab-text);font-size:var(--bttn-text-size);font-weight:400;position:relative;white-space:nowrap;letter-spacing:var(--bttn-letter-spacing);line-height:1;z-index:2}.app-tab svg{width:var(--icon-size);height:var(--icon-size);stroke-width:var(--icon-stroke-width);flex-shrink:0}.app-tab-text{max-width:0;opacity:0;overflow:hidden;transition:all .3s cubic-bezier(.4, 0, .2, 1);margin-left:0}.app-tab.active{background:0 0;color:#2563eb;position:relative}.app-tab.active::after{content:'';position:absolute;bottom:-.1rem;left:50%;transform:translateX(-50%);width:60%;height:3px;background:#2563eb;border-radius:2px}.app-tab.active[data-app=notes]{color:#9333ea}.app-tab.active[data-app=notes]::after{background:#9333ea}.app-tab.active[data-app=powerups]{color:#ea580c}.app-tab.active[data-app=powerups]::after{background:#ea580c}.app-tab.active .app-tab-text{max-width:100px;opacity:1;margin-left:.4rem}.app-tab:hover:not(.active){background:0 0;color:var(--apps-tab-hover-text);transform:scale(1.05)}.apps-content{position:absolute;top:0;left:0;right:0;bottom:0;overflow-y:auto;padding-top:1rem;background:0 0}.paint-splatter-bg{background:radial-gradient(circle at 20% 80%,#ff6b6b 0,transparent 50%),radial-gradient(circle at 80% 20%,#4ecdc4 0,transparent 50%),radial-gradient(circle at 40% 40%,#45b7d1 0,transparent 50%),radial-gradient(circle at 90% 90%,#f9ca24 0,transparent 50%),radial-gradient(circle at 10% 10%,#6c5ce7 0,transparent 50%),radial-gradient(circle at 70% 70%,#fd79a8 0,transparent 50%),conic-gradient(from 180deg at 50% 50%,#ff7675,#74b9ff,#00b894,#fdcb6e,#6c5ce7,#fd79a8,#ff7675)!important}.paint-splatter-bg::before{content:'';position:absolute;top:0;left:0;right:0;bottom:0;background:rgba(255,255,255,.25);backdrop-filter:blur(8px) saturate(180%);-webkit-backdrop-filter:blur(8px) saturate(180%);pointer-events:none;z-index:0}.tab-container{position:relative;z-index:1}.tab-container{display:none;height:100%;padding:1rem;padding-top:1.5rem}.tab-container.active{display:block}@keyframes slideIn{from{opacity:0;transform:translateY(-5px)}to{opacity:1;transform:translateY(0)}}.tab-container.active{animation:slideIn .3s ease}.sidebar-resize-handle{position:absolute;left:8px;top:50%;transform:translateY(-50%);width:6px;height:80px;cursor:col-resize;border-radius:50px;overflow:hidden;z-index:1000;box-shadow:0 0 4px rgba(0,0,0,.15);transition:all .3s cubic-bezier(.4, 0, .2, 1)}.sidebar-resize-handle::before{content:'';position:absolute;inset:0;border-radius:inherit;backdrop-filter:blur(3px);-webkit-backdrop-filter:blur(3px)}.sidebar-resize-handle::after{content:'';position:absolute;inset:0;border-radius:inherit;background:rgba(255,255,255,.4);box-shadow:inset 1px 1px 1px 0 rgba(255,255,255,.3),inset -1px -1px 1px 0 rgba(255,255,255,.2)}.sidebar-resize-handle:hover{transform:translateY(-50%) scale(1.1)}.sidebar-resize-handle:hover::after{background:rgba(255,255,255,.7)}[data-theme=dark] .sidebar-resize-handle::after{background:rgba(255,255,255,.2);box-shadow:inset 1px 1px 1px 0 rgba(255,255,255,.1),inset -1px -1px 1px 0 rgba(255,255,255,.05)}[data-theme=dark] .sidebar-resize-handle:hover::after{background:rgba(255,255,255,.4)}.app-tab{transition:background .3s ease,color .3s ease,box-shadow .3s ease}.app-tab-text{transition:max-width .3s ease,opacity .3s ease,margin-left .3s ease}.chat-interface{height:100%;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:2rem}.chat-interface .app-placeholder-card{position:relative;padding:2.5rem;border-radius:16px;text-align:center;max-width:350px;width:100%;overflow:hidden;background:radial-gradient(circle at 50% 0,rgba(37,99,235,.12) 0,transparent 70%),var(--bg-color);border:1px solid rgba(37,99,235,.15);box-shadow:0 4px 20px rgba(37,99,235,.08);transition:all .3s ease}.chat-interface .app-placeholder-card:hover{transform:translateY(-2px);box-shadow:0 8px 30px rgba(37,99,235,.15);border-color:rgba(37,99,235,.25)}.chat-interface .placeholder-badge{display:inline-block;padding:.4rem .8rem;background:#2563eb;color:#fff;font-size:var(--text-xs);font-weight:600;border-radius:8px;letter-spacing:.05em;text-transform:uppercase;margin-bottom:1rem;box-shadow:0 3px 12px rgba(37,99,235,.4)}.chat-interface .placeholder-title{font-size:var(--text-xxl);font-weight:600;color:var(--text-primary-color);margin-bottom:.8rem;line-height:1.3}.chat-interface .placeholder-subtitle{font-size:var(--text-base);color:var(--text-secondary-color);line-height:1.6;opacity:.9}[data-theme=dark] .chat-interface .app-placeholder-card{background:radial-gradient(circle at 50% 0,rgba(37,99,235,.15) 0,transparent 70%),var(--section-bg-color,#1f1f1f);border-color:rgba(37,99,235,.2);box-shadow:0 4px 20px rgba(0,0,0,.3)}[data-theme=dark] .chat-interface .app-placeholder-card:hover{box-shadow:0 8px 30px rgba(0,0,0,.4);border-color:rgba(37,99,235,.3)}.notes-interface{height:100%;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:2rem}.notes-interface .app-placeholder-card{position:relative;padding:2.5rem;border-radius:16px;text-align:center;max-width:350px;width:100%;overflow:hidden;background:radial-gradient(circle at 50% 0,rgba(147,51,234,.12) 0,transparent 70%),var(--bg-color);border:1px solid rgba(147,51,234,.15);box-shadow:0 4px 20px rgba(147,51,234,.08);transition:all .3s ease}.notes-interface .app-placeholder-card:hover{transform:translateY(-2px);box-shadow:0 8px 30px rgba(147,51,234,.15);border-color:rgba(147,51,234,.25)}.notes-interface .placeholder-badge{display:inline-block;padding:.4rem .8rem;background:#9333ea;color:#fff;font-size:var(--text-xs);font-weight:600;border-radius:8px;letter-spacing:.05em;text-transform:uppercase;margin-bottom:1rem;box-shadow:0 3px 12px rgba(147,51,234,.4)}.notes-interface .placeholder-title{font-size:var(--text-xxl);font-weight:600;color:var(--text-primary-color);margin-bottom:.8rem;line-height:1.3}.notes-interface .placeholder-subtitle{font-size:var(--text-base);color:var(--text-secondary-color);line-height:1.6;opacity:.9}[data-theme=dark] .notes-interface .app-placeholder-card{background:radial-gradient(circle at 50% 0,rgba(147,51,234,.15) 0,transparent 70%),var(--section-bg-color,#1f1f1f);border-color:rgba(147,51,234,.2);box-shadow:0 4px 20px rgba(0,0,0,.3)}[data-theme=dark] .notes-interface .app-placeholder-card:hover{box-shadow:0 8px 30px rgba(0,0,0,.4);border-color:rgba(147,51,234,.3)}.notes-editor{width:100%;height:100%;min-height:400px;padding:1rem;border:1px solid var(--border-color,#e5e7eb);border-radius:8px;resize:none;font-family:inherit;font-size:.95rem;line-height:1.6}.notes-editor:focus{outline:0;border-color:var(--primary,#3b82f6);box-shadow:0 0 0 3px rgba(59,130,246,.1)}.powerups-interface{height:100%;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:2rem}.powerups-interface .app-placeholder-card{position:relative;padding:2.5rem;border-radius:16px;text-align:center;max-width:350px;width:100%;overflow:hidden;background:radial-gradient(circle at 50% 0,rgba(234,88,12,.12) 0,transparent 70%),var(--bg-color);border:1px solid rgba(234,88,12,.15);box-shadow:0 4px 20px rgba(234,88,12,.08);transition:all .3s ease}.powerups-interface .app-placeholder-card:hover{transform:translateY(-2px);box-shadow:0 8px 30px rgba(234,88,12,.15);border-color:rgba(234,88,12,.25)}.powerups-interface .placeholder-badge{display:inline-block;padding:.4rem .8rem;background:#ea580c;color:#fff;font-size:var(--text-xs);font-weight:600;border-radius:8px;letter-spacing:.05em;text-transform:uppercase;margin-bottom:1rem;box-shadow:0 3px 12px rgba(234,88,12,.4)}.powerups-interface .placeholder-title{font-size:var(--text-xxl);font-weight:600;color:var(--text-primary-color);margin-bottom:.8rem;line-height:1.3}.powerups-interface .placeholder-subtitle{font-size:var(--text-base);color:var(--text-secondary-color);line-height:1.6;opacity:.9}.powerup-features{list-style:none;padding:0;margin:1.5rem 0 1rem 0;text-align:left;max-width:280px;margin-left:auto;margin-right:auto}.powerup-features li{display:flex;align-items:flex-start;gap:.75rem;margin-bottom:1rem;line-height:1.4}.powerup-features li:last-child{margin-bottom:0}.powerup-features i{width:20px;height:20px;flex-shrink:0;opacity:.8;margin-top:.1rem;color:#ea580c}.feature-content{display:flex;flex-direction:column;gap:.25rem;flex:1}.feature-content strong{color:var(--text-primary-color);font-size:var(--text-sm);font-weight:600;line-height:1.2}.feature-content span{color:var(--text-secondary-color);font-size:var(--text-xs);opacity:.9;line-height:1.3}.more-features{font-size:var(--text-xs);color:var(--text-secondary-color);opacity:.7;margin:.75rem 0 0 0;text-align:center;font-style:italic}[data-theme=dark] .powerups-interface .app-placeholder-card{background:radial-gradient(circle at 50% 0,rgba(234,88,12,.15) 0,transparent 70%),var(--section-bg-color,#1f1f1f);border-color:rgba(234,88,12,.2);box-shadow:0 4px 20px rgba(0,0,0,.3)}[data-theme=dark] .powerups-interface .app-placeholder-card:hover{box-shadow:0 8px 30px rgba(0,0,0,.4);border-color:rgba(234,88,12,.3)}.powerup-tools{display:grid;grid-template-columns:repeat(auto-fill,minmax(120px,1fr));gap:.75rem;margin-top:1rem}.powerup-btn{padding:1rem;border:1px solid var(--border-color,#e5e7eb);border-radius:8px;background:#fff;cursor:pointer;transition:all .2s ease;font-size:.875rem;text-align:center}.powerup-btn:hover{transform:translateY(-2px);box-shadow:0 4px 12px rgba(0,0,0,.1);border-color:var(--primary,#3b82f6)}.breadcrumbs{display:flex;align-items:center;background-color:var(--breadcrumb-bg);font-size:var(--text-md);border-bottom:1px solid var(--breadcrumb-border);overflow:hidden!important;padding:var(--spacing-xs) .15rem;isolation:isolate;position:sticky;top:0;min-height:fit-content;z-index:50;transition:all .3s ease;max-width:100%;width:100%;transform:translateZ(0);will-change:transform}.breadcrumbs-list{display:flex;align-items:center;list-style:none;margin:0;padding:5px calc(var(--spacing-sm) + 5px);overflow-x:auto;overflow-y:hidden;white-space:nowrap;-ms-overflow-style:none;scrollbar-width:none;transition:all .3s ease}.breadcrumbs-list::-webkit-scrollbar{display:none}.breadcrumb-item{display:flex;align-items:center;color:var(--breadcrumb-text);transition:all .3s ease}.breadcrumb-item:not(:last-child)::after{content:'';display:inline-block;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%2364748b' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='9 18 15 12 9 6'%3E%3C/polyline%3E%3C/svg%3E");width:16px;height:16px;margin:0 var(--spacing-xs);background-repeat:no-repeat;background-position:center;opacity:.7;transition:all .3s ease}.breadcrumb-item a{color:var(--breadcrumb-text);text-decoration:none;transition:color .3s ease}.breadcrumb-item a:hover{color:var(--primary-color)}.breadcrumb-item.active{color:var(--breadcrumb-text-active);font-weight:400;font-style:italic}#content-area>.breadcrumbs:first-child{margin-top:0!important;position:sticky;top:0;backface-visibility:hidden;-webkit-backface-visibility:hidden;transform:translate3d(0,0,0);-webkit-transform:translate3d(0,0,0)}@media (max-width:768px){#content-area>.breadcrumbs{position:sticky!important;top:0!important;margin-top:0!important;transform:translateZ(0)!important;-webkit-transform:translateZ(0)!important;will-change:transform!important;scroll-margin-top:0!important;scroll-padding-top:0!important}#content-area>.breadcrumbs:first-child{margin-top:0!important;padding-top:var(--spacing-xs)!important}}.breadcrumbs::after,.breadcrumbs::before{content:'';position:absolute;top:0;bottom:0;width:15px;z-index:2;pointer-events:none}.breadcrumbs::before{left:0;background:linear-gradient(90deg,var(--breadcrumb-bg) 0,rgba(var(--breadcrumb-bg-rgb),.98) 10%,rgba(var(--breadcrumb-bg-rgb),.85) 25%,rgba(var(--breadcrumb-bg-rgb),.55) 45%,rgba(var(--breadcrumb-bg-rgb),.15) 70%,rgba(var(--breadcrumb-bg-rgb),0) 90%,transparent 100%)}.breadcrumbs::after{right:0;background:linear-gradient(270deg,var(--breadcrumb-bg) 0,rgba(var(--breadcrumb-bg-rgb),.98) 10%,rgba(var(--breadcrumb-bg-rgb),.85) 25%,rgba(var(--breadcrumb-bg-rgb),.55) 45%,rgba(var(--breadcrumb-bg-rgb),.15) 70%,rgba(var(--breadcrumb-bg-rgb),0) 90%,transparent 100%)}.content-reveal-btn{display:inline-flex!important;align-items:center;gap:20px;margin:20px 0;position:relative;z-index:10;padding:12px 20px!important;font-size:.95rem!important;box-shadow:0 0 15px rgba(var(--highlight-color),.3)!important;transition:all .3s ease!important;animation:pulse-glow 2s infinite alternate}.content-reveal-btn:hover{box-shadow:0 3px 20px rgba(var(--highlight-color),.4)!important}.content-reveal-btn .circular-progress{position:relative;width:24px;height:24px;flex-shrink:0}.content-reveal-btn .progress-ring{width:100%;height:100%}.content-reveal-btn .progress-ring-circle{stroke:var(--progress-ring-stroke);fill:transparent;stroke-width:3;stroke-linecap:round;transition:stroke-dashoffset .3s ease;transform:rotate(-90deg);transform-origin:center}.content-reveal-btn .progress-ring-background{stroke:var(--progress-ring-bg);fill:transparent;stroke-width:3}@keyframes pulse-glow{from{box-shadow:0 4px 12px rgba(var(--highlight-color),.2)}to{box-shadow:0 4px 16px rgba(var(--highlight-color),.5)}}.marquee-container{overflow:hidden;width:100%;padding:0 .75rem 0 1rem;position:relative}.marquee-container .marquee-text{white-space:nowrap;transition:transform var(--scroll-duration, 2s) ease-out;display:inline-block;width:calc(100% + .5rem);margin-left:-.25rem}.marquee-container.has-overflow::after,.marquee-container.has-overflow::before{content:'';position:absolute;height:calc(100% - 8px);z-index:2;pointer-events:none;transition:all .3s ease}.marquee-container.has-overflow::before{left:0;width:1rem;background:linear-gradient(90deg,var(--sidebar-bg) 0,var(--sidebar-bg) 25%,rgba(var(--sidebar-bg-rgb),.85) 45%,rgba(var(--sidebar-bg-rgb),.4) 70%,rgba(var(--sidebar-bg-rgb),.1) 90%,transparent 100%);transition:all .3s ease}.marquee-container.has-overflow::after{right:0;width:1.25rem;background:linear-gradient(270deg,var(--sidebar-bg) 0,var(--sidebar-bg) 20%,rgba(var(--sidebar-bg-rgb),.85) 40%,rgba(var(--sidebar-bg-rgb),.4) 65%,rgba(var(--sidebar-bg-rgb),.1) 85%,transparent 100%);transition:all .3s ease}.marquee-container.has-overflow:hover .marquee-text{transform:translateX(calc(-1 * var(--scroll-distance,0)))}[data-theme=dark] .marquee-container.has-overflow::before{background:linear-gradient(90deg,var(--sidebar-bg) 0,var(--sidebar-bg) 25%,rgba(var(--sidebar-bg-rgb),.85) 45%,rgba(var(--sidebar-bg-rgb),.4) 70%,rgba(var(--sidebar-bg-rgb),.1) 90%,transparent 100%)}[data-theme=dark] .marquee-container.has-overflow::after{background:linear-gradient(270deg,var(--sidebar-bg) 0,var(--sidebar-bg) 20%,rgba(var(--sidebar-bg-rgb),.85) 40%,rgba(var(--sidebar-bg-rgb),.4) 65%,rgba(var(--sidebar-bg-rgb),.1) 85%,transparent 100%)}.lesson-meta-tags{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:20px;padding:0}.lesson-meta-badge{display:inline-flex;align-items:center;gap:6px;padding:6px 10px;font-size:.8rem;font-weight:400;border-radius:6px;border:1px solid;background:0 0;transition:all .3s ease;cursor:default}.lesson-meta-badge svg{width:.9rem;height:.9rem;flex-shrink:0}.lesson-meta-badge.lesson-number{color:var(--primary-color);border-color:rgba(0,114,255,.3);background:rgba(0,114,255,.05)}.lesson-meta-badge.lesson-duration{color:#8b5cf6;border-color:rgba(139,92,246,.3);background:rgba(139,92,246,.05)}.lesson-meta-badge.lesson-type{color:#06b6d4;border-color:rgba(6,182,212,.3);background:rgba(6,182,212,.05)}.lesson-meta-badge.time-spent{color:#10b981;border-color:rgba(16,185,129,.3);background:rgba(16,185,129,.05)}[data-theme=dark] .lesson-meta-badge.lesson-number{color:#60a5fa;border-color:rgba(96,165,250,.4);background:rgba(96,165,250,.1)}[data-theme=dark] .lesson-meta-badge.lesson-duration{color:#a78bfa;border-color:rgba(167,139,250,.4);background:rgba(167,139,250,.1)}[data-theme=dark] .lesson-meta-badge.lesson-type{color:#22d3ee;border-color:rgba(34,211,238,.4);background:rgba(34,211,238,.1)}[data-theme=dark] 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