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var(--color-sidebar-border);background:var(--color-sidebar);color:var(--color-sidebar-foreground);flex-direction:column;display:flex;position:sticky;top:0;overflow-y:auto}.ui-brand{align-items:center;gap:var(--space-3);letter-spacing:-.01em;min-height:40px;font-weight:850;text-decoration:none;display:inline-flex}.ui-brand__mark{color:var(--color-accent);font-weight:950;font-size:var(--text-lg);justify-content:center;align-items:center;line-height:1;display:inline-flex}.ui-sidebar .ui-brand__mark{color:var(--color-accent-surface)}.ui-sidebar__context{margin-top:var(--space-7);padding-bottom:var(--space-5);border-bottom:1px solid var(--color-sidebar-border)}.ui-nav{gap:var(--space-1);margin-top:var(--space-5);display:grid}.ui-nav a{min-height:42px;padding:var(--space-2) var(--space-3);border-radius:var(--radius);color:var(--color-sidebar-muted);font-size:var(--text-sm);border:1px solid #0000;align-items:center;font-weight:700;text-decoration:none;display:flex}.ui-nav a:hover{background:color-mix(in srgb, var(--color-sidebar-foreground) 6%, transparent);color:var(--color-sidebar-foreground)}.ui-nav a[aria-current=page]{color:var(--color-sidebar-foreground);border-color:color-mix(in srgb, var(--color-accent-surface) 28%, var(--color-sidebar-border));background:color-mix(in srgb, var(--color-accent) 34%, var(--color-sidebar))}.ui-sidebar__footer{padding-top:var(--space-6);color:var(--color-sidebar-muted);margin-top:auto}.ui-sidebar .ui-context-switcher{color:var(--color-sidebar-muted)}.ui-sidebar .ui-context-switcher select{border-color:var(--color-sidebar-border);background:color-mix(in srgb, var(--color-sidebar-foreground) 5%, var(--color-sidebar));color:var(--color-sidebar-foreground)}.ui-shell-main{min-width:0}.ui-topbar{justify-content:space-between;align-items:center;gap:var(--space-4);min-height:72px;padding:0 var(--space-8);border-bottom:1px solid var(--color-border);background:color-mix(in srgb, var(--color-background) 92%, var(--color-surface));z-index:10;display:flex;position:sticky;top:0}.ui-topbar>strong{font-size:var(--text-sm);font-weight:800}.ui-topbar__account{align-items:center;gap:var(--space-3);color:var(--color-muted-foreground);font-size:var(--text-sm);display:flex}.ui-page{width:min(100%, var(--content-max));padding:var(--space-8);margin-inline:auto}.ui-page-header{justify-content:space-between;align-items:flex-start;gap:var(--space-8);margin-bottom:var(--space-7);display:flex}.ui-page-header h1{margin-bottom:var(--space-2)}.ui-page-header p{color:var(--color-muted-foreground);max-width:var(--prose-max);margin-bottom:0}.ui-page-header__actions{gap:var(--space-2);flex-wrap:wrap;flex:none;display:flex}.ui-breadcrumbs{margin-bottom:var(--space-4);font-size:var(--text-sm);color:var(--color-muted-foreground)}.ui-breadcrumbs ol{align-items:center;gap:var(--space-2);flex-wrap:wrap;margin:0;padding:0;list-style:none;display:flex}.ui-breadcrumbs li+li:before{content:"/";color:var(--color-border);margin-inline-end:var(--space-2)}.ui-breadcrumbs a:hover{color:var(--color-accent)}.ui-context-switcher{gap:var(--space-2);color:var(--color-muted-foreground);font-size:var(--text-xs);font-weight:750;display:grid}.ui-context-switcher select,.ui-input{border:1px solid var(--color-border);border-radius:var(--radius);width:100%;min-height:42px;padding:var(--space-2) var(--space-3);background:var(--color-surface);color:var(--color-foreground)}.ui-context-switcher select:hover,.ui-input:hover{border-color:color-mix(in srgb, var(--color-border) 55%, var(--color-foreground))}.ui-input:focus,.ui-context-switcher 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var(--color-border))}.ui-panel{background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius);overflow:hidden}.ui-panel__header{justify-content:space-between;align-items:center;gap:var(--space-4);min-height:60px;padding:var(--space-4) var(--space-5);border-bottom:1px solid var(--color-border);display:flex}.ui-panel__header h2{font-size:var(--text-base);margin:0}.ui-panel__body{padding:var(--space-5)}.ui-stat-grid{gap:var(--space-4);margin-bottom:var(--space-6);grid-template-columns:repeat(4,minmax(0,1fr));display:grid}.ui-stat{background:var(--color-surface);border:1px solid 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p{color:var(--color-muted-foreground);margin:0}.ui-dialog__body{padding:var(--space-5)}.ui-dialog__actions{justify-content:flex-end;gap:var(--space-2);padding:var(--space-4) var(--space-5);border-top:1px solid var(--color-border);display:flex}.ui-toast-region{z-index:100;inset-inline-end:var(--space-4);bottom:var(--space-4);gap:var(--space-2);width:min(22rem,100vw - 2rem);display:grid;position:fixed}.ui-toast{padding:var(--space-3) var(--space-4);background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius);box-shadow:var(--shadow-overlay);font-size:var(--text-sm)}.ui-toast--success{border-color:color-mix(in srgb, var(--color-success) 30%, var(--color-border))}.ui-toast--warning{border-color:color-mix(in srgb, var(--color-warning-accent) 45%, var(--color-border))}.ui-toast--danger{border-color:color-mix(in srgb, var(--color-danger) 30%, var(--color-border))}.ui-state{justify-content:center;align-items:flex-start;gap:var(--space-2);min-height:180px;padding:var(--space-6);border:1px solid var(--color-border);border-radius:var(--radius);background:var(--color-surface);flex-direction:column;display:flex}.ui-state h2,.ui-state p{margin-bottom:0}.ui-state p{color:var(--color-muted-foreground);max-width:var(--prose-max)}.ui-state--error{border-color:color-mix(in srgb, var(--color-danger) 32%, var(--color-border));background:color-mix(in srgb, var(--color-danger-surface) 60%, var(--color-surface))}.ui-request-id{font-size:var(--text-xs)}.ui-loading-line{border-radius:var(--radius);background:var(--color-surface-strong);width:min(18rem,70%);height:8px;display:block;position:relative;overflow:hidden}.ui-loading-line:after{content:"";background:color-mix(in srgb, var(--color-accent) 18%, var(--color-surface-strong));width:35%;animation:1.2s ease-in-out infinite alternate ui-loading;position:absolute;inset:0 auto 0 0}@keyframes 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var(--color-surface));justify-content:center;align-items:center;font-weight:850;display:inline-flex}.ui-account-signout{min-height:34px;padding-inline:var(--space-3);border:1px solid var(--color-border);border-radius:var(--radius);color:var(--color-muted-foreground);font-size:var(--text-xs);cursor:pointer;background:0 0}.ui-account-signout:hover{color:var(--color-foreground);background:var(--color-surface-subtle)}.ui-note{padding:var(--space-4);border-inline-start:3px solid var(--color-accent);background:color-mix(in srgb, var(--color-accent-surface) 30%, var(--color-surface))}.ui-note p:last-child{margin-bottom:0}.ui-section-gap{margin-top:var(--space-5)}.marketing-shell{background:var(--color-background);min-height:100vh}.marketing-header{border-bottom:1px solid var(--color-border);background:color-mix(in srgb, var(--color-background) 90%, var(--color-surface));z-index:20;position:sticky;top:0}.marketing-header__inner{width:min(100% - 2rem, var(--content-max));justify-content:space-between;align-items:center;gap:var(--space-4);min-height:72px;margin-inline:auto;display:flex}.marketing-nav{align-items:center;gap:var(--space-5);font-size:var(--text-sm);display:flex}.marketing-nav a{color:var(--color-muted-foreground);font-weight:650;text-decoration:none}.marketing-nav a:hover{color:var(--color-accent)}.marketing-main{width:min(100% - 2rem, var(--content-max));margin-inline:auto}.marketing-hero{gap:var(--space-12);padding-block:var(--space-20);grid-template-columns:minmax(0,1.25fr) minmax(20rem,.75fr);align-items:center;display:grid}.marketing-hero h1{max-width:16ch;font-size:var(--text-hero);letter-spacing:-.035em;line-height:1.12}.marketing-hero p{max-width:var(--prose-max);color:var(--color-muted-foreground);font-size:var(--text-base)}.marketing-actions{gap:var(--space-3);margin-top:var(--space-6);flex-wrap:wrap;display:flex}.marketing-summary{border:1px solid var(--color-border);border-radius:var(--radius);background:var(--color-surface);padding:var(--space-6)}.marketing-summary:before{content:"";width:48px;height:4px;margin-bottom:var(--space-5);border-radius:var(--radius);background:var(--color-accent);display:block}.marketing-summary dl{gap:var(--space-4);margin:0;display:grid}.marketing-summary div{justify-content:space-between;gap:var(--space-4);padding-bottom:var(--space-3);border-bottom:1px solid var(--color-border);display:flex}.marketing-summary div:last-child{border-bottom:0;padding-bottom:0}.marketing-summary dt{color:var(--color-muted-foreground)}.marketing-summary dd{margin:0;font-weight:800}.marketing-section{padding-block:var(--space-16);border-top:1px solid var(--color-border)}.marketing-section__intro{max-width:var(--prose-max);margin-bottom:var(--space-8)}.marketing-section__intro p{color:var(--color-muted-foreground)}.marketing-feature-list{gap:var(--space-6) var(--space-10);grid-template-columns:repeat(2,minmax(0,1fr));display:grid}.marketing-feature{padding-block:var(--space-4);border-bottom:1px solid var(--color-border)}.marketing-feature h3{font-size:var(--text-lg)}.marketing-feature p{color:var(--color-muted-foreground);margin-bottom:0}.marketing-pricing{gap:var(--space-4);grid-template-columns:repeat(3,minmax(0,1fr));display:grid}.marketing-plan{border:1px solid var(--color-border);border-radius:var(--radius);background:var(--color-surface);padding:var(--space-5)}.marketing-plan--featured{border-color:var(--color-accent)}.marketing-plan h3{font-size:var(--text-lg)}.marketing-plan__price{font-size:var(--text-xl);margin-bottom:var(--space-4);font-weight:850}.marketing-plan ul{color:var(--color-muted-foreground);padding-inline-start:var(--space-5)}.marketing-faq{gap:0;display:grid}.marketing-faq details{padding:var(--space-4) 0;border-bottom:1px solid var(--color-border)}.marketing-faq summary{cursor:pointer;font-weight:750}.marketing-faq p{color:var(--color-muted-foreground);max-width:var(--prose-max);margin-top:var(--space-3);margin-bottom:0}.marketing-footer{border-top:1px solid var(--color-border);margin-top:var(--space-16);background:var(--color-surface)}.marketing-footer__inner{width:min(100% - 2rem, var(--content-max));padding-block:var(--space-8);justify-content:space-between;gap:var(--space-4);color:var(--color-muted-foreground);font-size:var(--text-sm);margin-inline:auto;display:flex}.marketing-form{gap:var(--space-4);max-width:34rem;display:grid}.marketing-form__actions{gap:var(--space-3);flex-wrap:wrap;align-items:center;display:flex}.marketing-form__message{color:var(--color-muted-foreground);font-size:var(--text-sm);margin:0}@media (max-width:64rem){.ui-stat-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.ui-content-grid,.marketing-hero{grid-template-columns:1fr}.marketing-hero{gap:var(--space-8)}.marketing-feature-list,.marketing-pricing{grid-template-columns:1fr}.ui-account-copy{display:none}}@media (max-width:50rem){.ui-app-shell{display:block}.ui-sidebar{width:100%;height:auto;padding:var(--space-4);border-inline-end:0;border-bottom:1px solid var(--color-sidebar-border);position:static;overflow:visible}.ui-sidebar__context{margin-top:var(--space-4);padding-bottom:var(--space-4)}.ui-nav{gap:var(--space-2);margin-top:var(--space-4);padding-bottom:var(--space-2);scrollbar-width:thin;display:flex;overflow-x:auto}.ui-nav a{flex:none;min-height:38px}.ui-sidebar__footer{display:none}.ui-topbar{min-height:64px;padding:0 var(--space-4);position:static}.ui-page{padding:var(--space-5) 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var(--color-background))}.student-lesson-content{padding:var(--space-8);min-width:0}.student-lesson-body{max-width:var(--prose-max);font-size:var(--text-base);line-height:1.85}.student-lesson-body>p{white-space:pre-wrap}.student-lesson-body a{color:var(--color-accent)}.student-lesson-actions{margin-top:var(--space-8);padding-top:var(--space-5);border-top:1px solid var(--color-border)}@media (max-width:50rem){.student-public-header,.student-public-footer,.student-section-heading{padding-block:var(--space-3);flex-direction:column;align-items:flex-start}.student-course-row,.student-library-row,.student-course-facts{grid-template-columns:1fr}.student-course-facts div,.student-course-facts div:first-child{border-inline-start:0;border-top:1px solid var(--color-border)}.student-course-facts 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transparent);color:var(--color-foreground);font-size:var(--text-xs);opacity:.72;border:1px solid;gap:2px;line-height:1.3;display:grid;position:absolute;transform:translate(-10%,-10%)}.student-video-watermark span:last-child{letter-spacing:.04em;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace}.student-video-security-note{max-width:70ch;color:var(--color-muted-foreground);font-size:var(--text-sm);margin:0}.student-video-retry{padding:var(--space-5);border:1px solid var(--color-border);border-radius:var(--radius)}@media (max-width:760px){.teacher-video-upload,.teacher-lesson-create-form{grid-template-columns:1fr}.student-video-frame video{max-height:55vh}.student-video-frame iframe{min-height:14rem}.student-video-watermark{max-width:10rem}}.teacher-device-manager,.teacher-device-list{gap:var(--space-2);display:grid}.teacher-device-list{min-width:20rem;padding-top:var(--space-2)}.teacher-device-row{gap:var(--space-2);padding:var(--space-2) 0;border-top:1px solid 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h2{margin:0}.teacher-next-action p{color:var(--color-muted-foreground);margin:0}.teacher-readiness{gap:var(--space-3);padding:var(--space-4);border:1px solid var(--color-border);border-radius:var(--radius);background:var(--color-surface-subtle);display:grid}.teacher-readiness-list{gap:var(--space-2);margin:0;padding:0;list-style:none;display:grid}.teacher-readiness-list li{justify-content:space-between;align-items:center;gap:var(--space-3);font-size:var(--text-sm);display:flex}.teacher-readiness-list span{color:var(--color-muted-foreground)}.teacher-publish-callout{gap:var(--space-3);border:1px solid var(--color-border);border-radius:var(--radius);padding:var(--space-4);display:grid}.teacher-publish-callout--ready{border-color:color-mix(in srgb, var(--color-accent) 45%, var(--color-border));background:color-mix(in srgb, var(--color-accent-surface) 28%, var(--color-surface))}.teacher-optional-card{border:1px dashed 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