:root{color-scheme:light;--brand-teal: #225F69;--deep-teal: #17464E;--ink: #1F2D2F;--ink-soft: #4A5A5C;--muted: #6D7A7B;--canvas: #F5F7F5;--surface: #FFFFFF;--line: #CFD9D7;--teal-mist: #E3EDEC;--sky: #6D98A8;--gold: #B8894A;--fault: #A4493D;--sans: "Avenir Next", Avenir, ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;--reading: "Iowan Old Style", "Palatino Linotype", "Book Antiqua", Georgia, serif;--mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;color:var(--ink);background:var(--canvas);font-family:var(--sans);font-synthesis:none;text-rendering:optimizeLegibility}*{box-sizing:border-box}html{min-width:320px;min-height:100%;background:var(--canvas);scroll-behavior:smooth}body{min-width:320px;min-height:100vh;margin:0;color:var(--ink);background:var(--canvas)}button,textarea,select,input{color:inherit;font:inherit}button,select{cursor:pointer}button{border:0}button:disabled{cursor:not-allowed;opacity:.5}button:focus-visible,textarea:focus-visible,select:focus-visible,input:focus-visible,a:focus-visible{outline:2px solid var(--brand-teal);outline-offset:2px}h1,h2,h3,h4,p,blockquote{margin-top:0}h1,h2,h3,h4{font-family:var(--sans);font-weight:650;letter-spacing:-.015em}svg{flex:0 0 auto}::selection{color:#fff;background:var(--brand-teal)}.skip-link{position:fixed;z-index:200;top:12px;left:12px;padding:9px 12px;color:#fff;background:var(--deep-teal);border-radius:4px;transform:translateY(-160%)}.skip-link:focus{transform:translateY(0)}.visually-hidden{position:absolute!important;width:1px!important;height:1px!important;padding:0!important;margin:-1px!important;overflow:hidden!important;clip:rect(0,0,0,0)!important;white-space:nowrap!important;border:0!important}.app-shell{min-height:100vh;display:grid;grid-template-columns:232px minmax(0,1fr)}.app-header{position:sticky;z-index:50;top:0;grid-column:1;grid-row:1;display:flex;flex-direction:column;height:100vh;padding:18px 12px 12px;color:var(--ink);background:var(--surface);border-right:1px solid var(--line);overflow-y:auto}.brand{display:flex;align-items:center;gap:10px;width:100%;padding:0 8px 20px;color:var(--ink);text-align:left;background:transparent}.brand>span:last-child{display:grid}.brand-mark{width:32px;height:32px;object-fit:contain}.brand strong{font-size:1.2rem;font-weight:700;line-height:1;letter-spacing:-.02em}.brand small{margin-top:4px;color:var(--muted);font-size:.58rem;letter-spacing:.08em;text-transform:uppercase}.language-switcher{display:grid;gap:5px;margin:0 6px 16px}.language-switcher span{color:var(--muted);font-size:.62rem}.language-switcher select{min-height:38px;padding:7px 9px;color:var(--ink);background:var(--surface);border:1px solid var(--line);border-radius:4px}.primary-nav{display:grid;gap:3px}.primary-nav button{position:relative;display:flex;align-items:center;gap:10px;min-height:42px;padding:9px 10px;color:var(--ink-soft);text-align:left;background:transparent;border-radius:4px;transition:background .12s ease,color .12s ease}.primary-nav button:hover{color:var(--ink);background:var(--teal-mist)}.primary-nav button.active{color:var(--deep-teal);background:var(--teal-mist);font-weight:700}.primary-nav button.active:before{content:"";position:absolute;left:0;top:9px;width:3px;height:24px;background:var(--brand-teal);border-radius:2px}.primary-nav button b{display:grid;min-width:18px;height:18px;margin-left:auto;place-items:center;padding:0 4px;color:var(--deep-teal);background:#225f6924;border-radius:999px;font-size:.62rem}.account-trigger{display:grid;grid-template-columns:auto 1fr;gap:1px 9px;align-items:center;margin-top:auto;padding:12px 10px;color:var(--ink-soft);text-align:left;background:transparent;border-top:1px solid var(--line);border-radius:0}.account-trigger svg{grid-row:span 2}.account-trigger span{font-size:.72rem;font-weight:650}.account-trigger small{overflow:hidden;color:var(--muted);font-size:.58rem;text-overflow:ellipsis;white-space:nowrap}.account-trigger:hover,.account-trigger.active{color:var(--deep-teal);background:var(--teal-mist)}.account-sheet-backdrop{position:fixed;z-index:140;inset:0;background:#17464e3d}.account-sheet{position:fixed;z-index:150;top:16px;right:16px;bottom:16px;display:flex;width:min(420px,calc(100vw - 32px));flex-direction:column;gap:18px;padding:22px;background:var(--surface);border:1px solid var(--line);border-radius:6px;overflow-y:auto}.account-sheet>header{display:flex;align-items:start;justify-content:space-between;gap:20px}.account-sheet h2{margin:2px 0 3px;font-size:1.55rem}.account-sheet header p{margin:0;color:var(--muted);font-size:.7rem}.account-sync-state{display:flex;align-items:center;gap:8px;padding:9px 11px;color:var(--muted);background:var(--canvas);border:1px solid var(--line);border-radius:4px;font-size:.68rem}.account-sync-state i{width:8px;height:8px;background:var(--brand-teal);border-radius:50%}.account-sync-state i.offline{background:var(--fault)}.account-settings{display:grid;gap:11px}.account-settings h3{margin:2px 0;font-size:1.05rem}.account-settings label{display:grid;gap:5px}.account-settings label>span{color:var(--muted);font-size:.68rem}.account-settings select{min-height:40px;padding:8px 10px;background:var(--surface);border:1px solid var(--line);border-radius:4px}.account-sheet-actions{display:grid;gap:7px;margin-top:auto;padding-top:16px;border-top:1px solid var(--line)}.account-sheet-actions button{justify-content:center;min-height:40px}.account-sheet-actions button:last-child{color:var(--muted);background:transparent}.account-danger{display:grid;gap:11px;margin-top:auto;padding-top:16px;border-top:1px solid var(--line)}.account-danger h3{margin:0 0 3px;font-size:1.08rem}.account-danger p{margin:0;color:var(--muted);font-size:.72rem;line-height:1.45}.account-danger label{display:grid;gap:5px}.account-danger label>span{color:var(--muted);font-size:.68rem}.account-danger input{min-height:40px;padding:8px 10px;background:var(--surface);border:1px solid var(--line);border-radius:4px;font-family:var(--mono);letter-spacing:.08em}.account-danger-actions{display:grid;grid-template-columns:1fr 1fr;gap:7px}.account-danger-actions button{min-height:40px}.danger-action{display:inline-flex;align-items:center;justify-content:center;color:var(--fault);background:#a4493d1a;border:1px solid rgb(164 73 61 / .42);border-radius:4px;font-weight:650}.danger-action:hover:not(:disabled){color:#fff;background:var(--fault);border-color:var(--fault)}.extension-connections{display:grid;gap:11px;padding-top:4px;border-top:1px solid var(--line)}.extension-connections-heading{display:flex;align-items:start;justify-content:space-between;gap:12px}.extension-connections-heading>div{min-width:0}.extension-connections h3{margin:2px 0 3px;font-size:1.05rem}.extension-connections-heading p{margin:0;color:var(--muted);font-size:.7rem;line-height:1.4}.extension-refresh{width:34px;height:34px;flex:0 0 auto}.extension-refresh span{display:block;font-size:1.15rem;line-height:1}.extension-approval{display:grid;gap:8px;padding:13px;background:var(--canvas);border:1px solid var(--line);border-left:3px solid var(--gold);border-radius:4px}.extension-approval h4{margin:0;font:650 .9rem/1.25 var(--sans)}.extension-approval p{margin:0;color:var(--ink-soft);font-size:.73rem;line-height:1.45}.extension-approval-actions{display:flex;justify-content:flex-end;gap:7px;margin-top:2px}.extension-approval-actions button{min-height:36px;padding:8px 10px;font-size:.72rem}.extension-success{display:grid;gap:3px;padding:10px 11px;color:var(--deep-teal);background:var(--teal-mist);border:1px solid var(--line);border-radius:4px;font-size:.7rem;line-height:1.4}.extension-success strong{font-weight:700}.extension-state{display:grid;justify-items:start;gap:7px;padding:13px;color:var(--muted);background:var(--canvas);border:1px solid var(--line);border-radius:4px;font-size:.72rem;line-height:1.4}.extension-state .loading-ring{width:22px;height:22px}.extension-state strong{color:var(--ink);font-size:.78rem}.extension-state-error{color:var(--fault);background:#a4493d1a;border-color:#a4493d6b}.extension-state-error strong{color:var(--fault)}.extension-state-error .secondary-action{min-height:34px;padding:6px 10px;font-size:.68rem}.extension-empty{background:var(--canvas);border-style:dashed}.extension-list{display:grid;gap:8px}.extension-connection{display:grid;grid-template-columns:auto minmax(0,1fr) auto;align-items:start;gap:10px;padding:11px;background:var(--surface);border:1px solid var(--line);border-radius:4px}.extension-connection-icon{display:grid;width:30px;height:30px;place-items:center;color:var(--brand-teal);background:var(--teal-mist);border-radius:4px;font-size:.9rem}.extension-connection-copy{min-width:0}.extension-connection-copy h4{margin:1px 0 3px;overflow:hidden;font:650 .78rem/1.2 var(--sans);text-overflow:ellipsis;white-space:nowrap}.extension-connection-copy>p{margin:0;color:var(--muted);font-size:.64rem}.extension-connection-meta{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px;margin:9px 0 0}.extension-connection-meta>div{display:grid;gap:2px;min-width:0}.extension-connection-meta dt{color:var(--muted);font-size:.58rem;text-transform:uppercase;letter-spacing:.04em}.extension-connection-meta dd{margin:0;overflow:hidden;color:var(--ink-soft);font-size:.63rem;text-overflow:ellipsis;white-space:nowrap}.extension-revoke{min-height:32px;padding:6px 9px;color:var(--fault);border-color:#a4493d6b;font-size:.66rem}.extension-revoke:hover:not(:disabled){color:#fff;background:var(--fault);border-color:var(--fault)}.conversion-layer{position:fixed;z-index:160;inset:0;display:grid;place-items:center;padding:20px}.conversion-backdrop{position:absolute;inset:0;background:#17464e4d}.conversion-sheet{position:relative;display:grid;width:min(680px,100%);gap:13px;padding:clamp(24px,4vw,36px);background:var(--surface);border:1px solid var(--line);border-radius:6px}.conversion-sheet>.icon-button{position:absolute;top:14px;right:14px}.conversion-sheet>img{width:64px;height:64px;object-fit:contain}.conversion-sheet h2{max-width:520px;margin:2px 0;font-size:clamp(1.7rem,3.4vw,2.5rem)}.conversion-sheet>p{max-width:480px;margin:0;color:var(--muted);line-height:1.5}.conversion-actions{display:flex;justify-content:flex-end;gap:9px;margin-top:7px}.conversion-actions>button:not(.primary-action){padding:9px 11px;color:var(--muted);background:transparent}.conversion-plans{margin-top:3px}.lesson-focus{display:block}.lesson-focus .app-header{display:none}.lesson-focus .lesson-player,.lesson-focus .course-empty{grid-column:1}.course-view,.today-view,.studio-view,.review-view,.progress-view-new,.lesson-player,.course-empty{grid-column:2;min-width:0}.primary-action{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:40px;padding:8px 14px;color:#fff;background:var(--brand-teal);border:1px solid var(--brand-teal);border-radius:4px;font-weight:650;transition:background .12s ease,border-color .12s ease}.primary-action:hover:not(:disabled){background:var(--deep-teal);border-color:var(--deep-teal)}.secondary-action,.quiet-action{display:inline-flex;align-items:center;justify-content:center;gap:7px;min-height:38px;padding:8px 12px;color:var(--ink);background:var(--surface);border:1px solid var(--line);border-radius:4px;font-weight:650;transition:border-color .12s ease,color .12s ease,background .12s ease}.secondary-action:hover:not(:disabled),.quiet-action:hover:not(:disabled){color:var(--deep-teal);background:var(--teal-mist);border-color:var(--brand-teal)}.quiet-action.extension-revoke{color:var(--fault);border-color:#a4493d6b}.quiet-action.extension-revoke:hover:not(:disabled){color:#fff;background:var(--fault);border-color:var(--fault)}.icon-button{display:grid;width:38px;height:38px;place-items:center;color:var(--ink);background:var(--surface);border:1px solid var(--line);border-radius:4px}.icon-button:hover:not(:disabled){color:var(--deep-teal);background:var(--teal-mist)}[tabindex="-1"]:focus{outline:none}.inline-error,.course-error{color:var(--fault);background:#a4493d1a;border:1px solid rgb(164 73 61 / .42);border-radius:4px}.inline-error{margin-top:11px;padding:10px 12px;font-size:.8rem}.course-error{display:grid;gap:4px;padding:15px}.course-empty{display:grid;min-height:320px;place-items:center;align-content:center;gap:12px;color:var(--muted)}.loading-ring{display:block;width:27px;height:27px;border:3px solid var(--teal-mist);border-top-color:var(--brand-teal);border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.today-view{max-width:1200px;width:100%;margin:0 auto;padding:34px clamp(24px,5vw,68px) 64px}.today-hero{display:flex;align-items:end;justify-content:space-between;gap:28px;margin-bottom:25px;padding-bottom:20px;border-bottom:1px solid var(--line)}.today-hero-copy{min-width:0}.today-hero h1{margin:7px 0 5px;font-size:clamp(1.9rem,3.2vw,2.6rem);line-height:1.05}.today-hero-copy>p{margin:0;color:var(--muted);font-size:.86rem}.today-hero-meta{display:flex;flex-shrink:0;gap:18px}.today-stat{display:grid;min-width:92px;gap:2px;padding:0 0 0 14px;text-align:left;border-left:2px solid var(--teal-mist)}.today-stat strong{font:700 1.65rem/1 var(--sans)}.today-stat span{color:var(--muted);font-size:.62rem;font-weight:650;letter-spacing:.04em;text-transform:uppercase}.today-steps{display:grid;gap:0;padding:0;margin:0;list-style:none;border-top:1px solid var(--line)}.today-step{display:grid;grid-template-columns:42px minmax(0,1fr) auto;align-items:center;gap:16px;padding:16px 0;background:transparent;border-bottom:1px solid var(--line)}.today-step.active{background:#225f6914;border-bottom-color:var(--brand-teal)}.today-step.done{opacity:.78}.today-step-index{display:grid;width:32px;height:32px;place-items:center;color:var(--muted);background:var(--teal-mist);border-radius:50%;font:700 .78rem var(--sans)}.today-step.active .today-step-index{color:#fff;background:var(--brand-teal)}.today-step.done .today-step-index{color:#fff;background:var(--deep-teal)}.today-step-copy{display:grid;min-width:0;gap:3px}.today-step-label{color:var(--muted);font-size:.62rem;font-weight:700;letter-spacing:.06em;text-transform:uppercase}.today-step.active .today-step-label{color:var(--brand-teal)}.today-step-copy strong{font-size:1.08rem;font-weight:650}.today-step-side{display:flex;align-items:center;gap:14px}.today-step-minutes{display:inline-flex;align-items:center;gap:5px;color:var(--muted);font-size:.7rem;font-weight:600}.today-step-cta{min-width:150px;justify-content:center;white-space:nowrap}.today-step.done .today-step-cta{min-width:0;padding:7px 11px;color:var(--muted);border-color:var(--line)}.today-after{margin-top:30px;padding:17px 0 0;border-top:1px solid var(--line)}.today-after h2{margin:0 0 4px;font-size:1rem}.today-after p{margin:0 0 12px;color:var(--muted);font-size:.78rem}.today-after>div{display:flex;flex-wrap:wrap;gap:8px}.course-view{padding:26px 0 0}.course-hero{display:flex;align-items:center;justify-content:space-between;gap:26px;max-width:1480px;margin:0 clamp(28px,5vw,72px);color:var(--ink);background:transparent;border-bottom:1px solid var(--line);border-left:4px solid var(--brand-teal);padding:22px 0 22px 18px}.course-hero-copy{align-self:auto;max-width:680px;min-width:0}.course-hero h1{max-width:720px;margin:7px 0 5px;font-size:clamp(1.8rem,2.8vw,2.5rem);line-height:1.08}.course-hero-copy>p{margin:0;color:var(--muted);font-size:.84rem;line-height:1.45}.course-hero-actions{display:grid;flex-shrink:0;justify-items:end;gap:10px}.hero-secondary{display:flex;gap:8px}.hero-secondary button{min-height:36px;padding:7px 11px;font-size:.74rem}.hero-action{min-width:170px;justify-content:center;color:#fff;background:var(--brand-teal)}.demo-course-note{margin:15px 0;color:var(--muted);font-size:.72rem}.path-section{max-width:1480px;margin:0 auto;padding:28px clamp(28px,5vw,72px) 64px}.path-header{display:flex;align-items:end;justify-content:space-between;gap:24px}.path-header h2{margin:0;font-size:1.55rem;line-height:1.1}.level-switch{display:flex;padding:2px;background:var(--teal-mist);border-radius:999px}.level-switch button{min-width:48px;height:32px;color:var(--muted);background:transparent;border-radius:999px;font-weight:600}.level-switch button.active{color:#fff;background:var(--deep-teal)}.level-progress-line{display:flex;align-items:center;gap:14px;margin:18px 0 17px;color:var(--muted);font-size:.72rem;font-weight:500}.level-progress-line>i{display:block;flex:1;max-width:280px;height:6px;background:var(--teal-mist);border-radius:999px;overflow:hidden}.level-progress-line>i b{display:block;height:100%;background:var(--brand-teal);border-radius:999px;transition:width .22s ease}.lesson-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 20px;border-top:1px solid var(--line)}.lesson-tile{display:grid;grid-template-columns:38px minmax(0,1fr) auto;min-height:126px;gap:13px;padding:16px 0;background:transparent;border-bottom:1px solid var(--line)}.lesson-tile.ready{background:#225f6914;border-bottom-color:var(--brand-teal)}.lesson-tile.later{opacity:.7}.lesson-number{display:flex;flex-direction:column;align-items:center;gap:7px;color:var(--muted);font:600 .65rem var(--sans)}.lesson-number i,.lesson-number svg{display:grid;width:22px;height:22px;place-items:center;padding:4px;color:#fff;background:var(--line);border-radius:50%}.lesson-tile.complete .lesson-number svg{background:var(--deep-teal)}.lesson-tile.ready .lesson-number i{background:var(--brand-teal)}.lesson-tile-copy>span{color:var(--brand-teal);font-size:.6rem;font-weight:700;letter-spacing:.07em;text-transform:uppercase}.lesson-tile h3{margin:5px 0 10px;font-size:1.12rem}.lesson-tile p{display:none}.lesson-tile-copy>div{display:flex;flex-wrap:wrap;gap:4px}.lesson-tile-copy small{padding:3px 5px;color:var(--muted);background:var(--canvas);border:1px solid var(--line);border-radius:3px;font-size:.58rem}.tile-action{align-self:end;display:inline-flex;align-items:center;gap:5px;min-height:35px;padding:7px 11px;color:var(--brand-teal);background:transparent;border:1px solid var(--brand-teal);border-radius:4px;font-size:.72rem;font-weight:700;transition:background .12s ease,color .12s ease}.tile-action:hover{color:#fff;background:var(--brand-teal)}.lesson-locked{align-self:end;display:inline-flex;align-items:center;gap:6px;min-height:32px;padding:6px 10px;color:var(--muted);background:var(--teal-mist);border-radius:4px;font-size:.7rem;font-weight:600}.lesson-tile.complete .tile-action{color:var(--muted);border-color:var(--line)}.lesson-tile.complete .tile-action:hover{color:var(--ink);background:var(--teal-mist)}.scene-canvas{position:relative;min-width:0;margin:0;background:var(--surface);border:1px solid var(--line);border-radius:4px;overflow:hidden}.scene-canvas>svg{display:block;width:100%;height:auto}.scene-canvas figcaption{display:flex;align-items:center;justify-content:space-between;gap:16px;min-height:44px;padding:9px 12px;color:var(--muted);background:var(--surface);border-top:1px solid var(--line);font-size:.58rem;text-transform:uppercase;letter-spacing:.07em}.scene-canvas figcaption strong{color:var(--ink);font-size:.64rem;letter-spacing:.04em}.scene-markers{position:absolute;inset:0 0 44px;pointer-events:none}.scene-marker{position:absolute;display:flex;align-items:center;gap:5px;max-width:170px;opacity:0;transition:opacity .18s ease}.scene-markers.visible .scene-marker{opacity:1}.scene-marker i{display:grid;width:23px;height:23px;place-items:center;color:#fff;background:var(--brand-teal);border:2px solid #fff;border-radius:50%;font:700 .57rem var(--sans)}.scene-marker b{padding:4px 7px;color:var(--ink);background:#fffffff5;border:1px solid var(--line);border-radius:3px;font-size:.63rem}.scene-marker.blue i{background:var(--sky)}.scene-marker.yellow i{color:var(--ink);background:var(--gold)}.svg-speech{display:grid;height:100%;place-items:center;color:var(--deep-teal);font:650 16px/1.3 var(--reading);text-align:center}.lesson-player{min-height:100vh;background:var(--canvas)}.lesson-topbar{position:sticky;z-index:30;top:0;display:grid;grid-template-columns:auto 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