:root{color-scheme:light;--navy: #2f2b27;--navy-soft: #4d4741;--ink: #2f2b27;--ink-soft: #504a44;--muted: #716a63;--paper: #faf8f3;--bench: #f4f1ea;--surface: #fffdf9;--mist: #ebe6dc;--line: #ded8ce;--line-strong: #c9c0b4;--rail: #eee9e0;--rail-active: #fffaf5;--coral: #b95838;--coral-deep: #a94f34;--coral-soft: #f3ded4;--blue: #556f78;--blue-soft: #e7ecec;--yellow: #9a6a2f;--yellow-soft: #f3e8d6;--green: #2f7a63;--fault: #a63f38;--display: "Iowan Old Style", "Palatino Linotype", "Book Antiqua", Georgia, serif;--body: "Avenir Next", Avenir, ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;--utility: "SFMono-Regular", Consolas, "Liberation Mono", monospace;color:var(--ink);background:var(--bench);font-family:var(--body);font-synthesis:none;text-rendering:optimizeLegibility}*{box-sizing:border-box}html{min-width:320px;min-height:100%;background:var(--bench);scroll-behavior:smooth}body{min-width:320px;min-height:100vh;margin:0;color:var(--ink);background:var(--bench)}button,textarea,select,input{color:inherit;font:inherit}button,select{cursor:pointer}button{border:0}button:disabled{cursor:not-allowed;opacity:.48}button:focus-visible,textarea:focus-visible,select:focus-visible,input:focus-visible,a:focus-visible{outline:2px solid var(--coral);outline-offset:2px}h1,h2,h3,p,blockquote{margin-top:0}h1,h2,h3{font-family:var(--display);font-weight:400;letter-spacing:-.02em}svg{flex:0 0 auto}::selection{color:var(--navy);background:#c9e5df}.skip-link{position:fixed;z-index:200;top:12px;left:12px;padding:10px 14px;color:#fff;background:var(--blue);border-radius:8px;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:16px 12px 12px;color:var(--ink);background:var(--rail);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-mark{width:34px;height:34px;object-fit:contain}.brand>span:last-child{display:grid}.brand strong{font-family:var(--display);font-size:1.4rem;font-weight:400;line-height:1;letter-spacing:-.025em}.brand small{margin-top:3px;color:var(--muted);font-size:.58rem;letter-spacing:.09em;text-transform:uppercase}.language-switcher{display:grid;gap:5px;margin:0 6px 15px}.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:8px}.primary-nav{display:grid;gap:4px}.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:9px;transition:background .12s ease,color .12s ease}.primary-nav button:hover{color:var(--ink);background:#fffdf9b3}.primary-nav button.active{color:var(--ink);background:var(--rail-active);box-shadow:0 1px #2f2b270a;font-weight:600}.primary-nav button.active:before{content:"";position:absolute;left:-1px;top:50%;width:3px;height:22px;background:var(--coral);border-radius:3px;transform:translateY(-50%)}.primary-nav button b{display:grid;min-width:18px;height:18px;margin-left:auto;place-items:center;padding:0 4px;color:var(--coral);background:var(--coral-soft);border-radius:9px;font-size:.62rem}.account-trigger{display:grid;grid-template-columns:auto 1fr;gap:1px 9px;align-items:center;margin-top:auto;padding:11px 10px;color:var(--ink-soft);text-align:left;background:transparent;border-top:1px solid var(--line)}.account-trigger svg{grid-row:span 2}.account-trigger span{font-size:.72rem;font-weight:600}.account-trigger small{overflow:hidden;color:var(--muted);font-size:.58rem;text-overflow:ellipsis;white-space:nowrap}.account-trigger:hover{color:var(--ink)}.account-trigger.active{color:var(--ink);background:var(--rail-active);border-radius:9px}.account-sheet-backdrop{position:fixed;z-index:140;inset:0;background:#2f2b2738;-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px)}.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:22px;padding:24px;background:var(--surface);border:1px solid var(--line);border-radius:18px;box-shadow:0 24px 80px #2f2b272e;overflow-y:auto}.account-sheet>header{display:flex;align-items:start;justify-content:space-between;gap:20px}.account-sheet h2{margin:5px 0 3px;font-size:2rem}.account-sheet header p{margin:0;color:var(--muted);font-size:.7rem}.account-sync-state{display:flex;align-items:center;gap:8px;padding:10px 12px;color:var(--muted);background:var(--bench);border-radius:9px;font-size:.68rem}.account-sync-state i{width:8px;height:8px;background:var(--green);border-radius:50%}.account-sync-state i.offline{background:var(--fault)}.account-settings{display:grid;gap:13px}.account-settings h3{margin:4px 0 5px;font-size:1.35rem}.account-settings label{display:grid;gap:6px}.account-settings label>span{color:var(--muted);font-size:.68rem}.account-settings select{min-height:42px;padding:8px 10px;background:var(--paper);border:1px solid var(--line);border-radius:9px}.account-sheet-actions{display:grid;gap:8px;margin-top:auto;padding-top:18px;border-top:1px solid var(--line)}.account-sheet-actions button{justify-content:center;min-height:42px}.account-sheet-actions button:last-child{color:var(--muted);background:transparent}.extension-connections{display:grid;gap:12px;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:3px 0 4px;font-size:1.35rem}.extension-connections-heading p{margin:0;color:var(--muted);font-size:.7rem;line-height:1.45}.extension-refresh{width:34px;height:34px;flex:0 0 auto}.extension-refresh span{display:block;font-size:1.25rem;line-height:1}.extension-refresh:not(:disabled):hover span{transform:rotate(-45deg)}.extension-approval{display:grid;gap:8px;padding:15px;background:#fff9f4;border:1px solid #e2bda8;border-radius:13px}.extension-approval h4{margin:0;font:600 .98rem/1.25 var(--body)}.extension-approval p{margin:0;color:var(--ink-soft);font-size:.73rem;line-height:1.5}.extension-approval-actions{display:flex;justify-content:flex-end;gap:8px;margin-top:3px}.extension-approval-actions button{min-height:38px;padding:8px 11px;font-size:.72rem}.extension-success{display:grid;gap:3px;padding:11px 12px;color:var(--green);background:#e7f1ec;border:1px solid #bbd8ca;border-radius:10px;font-size:.7rem;line-height:1.4}.extension-success strong{font-weight:700}.extension-state{display:grid;justify-items:start;gap:7px;padding:15px;color:var(--muted);background:var(--paper);border:1px solid var(--line);border-radius:11px;font-size:.72rem;line-height:1.45}.extension-state .loading-ring{width:22px;height:22px}.extension-state strong{color:var(--ink);font-size:.78rem}.extension-state-error{color:var(--fault);background:#fae8e5;border-color:#eac0ba}.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(--bench);border-style:dashed}.extension-list{display:grid;gap:9px}.extension-connection{display:grid;grid-template-columns:auto minmax(0,1fr) auto;align-items:start;gap:10px;padding:12px;background:var(--paper);border:1px solid var(--line);border-radius:11px}.extension-connection-icon{display:grid;width:31px;height:31px;place-items:center;color:var(--blue);background:var(--blue-soft);border-radius:9px;font-size:.95rem}.extension-connection-copy{min-width:0}.extension-connection-copy h4{margin:1px 0 3px;overflow:hidden;font:650 .78rem/1.2 var(--body);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:10px 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:#dfb7b2;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:#2f2b2747;-webkit-backdrop-filter:blur(3px);backdrop-filter:blur(3px)}.conversion-sheet{position:relative;display:grid;width:min(680px,100%);gap:14px;padding:clamp(26px,4vw,42px);background:var(--surface);border:1px solid var(--line);border-radius:20px;box-shadow:0 28px 90px #2f2b2733}.conversion-sheet>.icon-button{position:absolute;top:16px;right:16px}.conversion-sheet>img{width:82px;height:82px;object-fit:contain}.conversion-sheet h2{max-width:520px;margin:2px 0;font-size:clamp(2rem,4vw,3.2rem)}.conversion-sheet>p{max-width:480px;margin:0;color:var(--muted);line-height:1.55}.conversion-actions{display:flex;justify-content:flex-end;gap:10px;margin-top:8px}.conversion-actions>button:not(.primary-action){padding:10px 12px;color:var(--muted);background:transparent}.conversion-plans{margin-top:4px}.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}.kicker{display:block;color:var(--coral);font:650 .68rem/1.2 var(--body);letter-spacing:.035em}.primary-action{display:inline-flex;align-items:center;justify-content:center;gap:9px;min-height:42px;padding:9px 16px;color:#fff;background:var(--coral);border-radius:10px;font-weight:600;box-shadow:0 1px 2px #2f2b271f;transition:background .12s ease,transform .12s ease,box-shadow .12s ease}.primary-action:hover:not(:disabled){background:#a94f34;box-shadow:0 4px 14px #b9583847;transform:translateY(-1px)}.primary-action:active:not(:disabled){transform:translateY(0);box-shadow:0 1px 2px #2f2b271f}.secondary-action,.quiet-action{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:40px;padding:8px 14px;color:var(--ink);background:var(--surface);border:1px solid var(--line-strong);border-radius:10px;font-weight:600;transition:border-color .12s ease,color .12s ease,background .12s ease}.secondary-action:hover:not(:disabled),.quiet-action:hover:not(:disabled){color:var(--coral);background:var(--surface);border-color:var(--coral)}.quiet-action.extension-revoke{color:var(--fault);border-color:#dfb7b2}.quiet-action.extension-revoke:hover:not(:disabled){color:#fff;background:var(--fault);border-color:var(--fault)}.icon-button{display:grid;width:40px;height:40px;place-items:center;color:var(--ink);background:var(--surface);border:1px solid var(--line);border-radius:50%}[tabindex="-1"]:focus{outline:none}.inline-error,.course-error{color:var(--fault);background:#fae8e5;border:1px solid #eac0ba;border-radius:10px}.inline-error{margin-top:12px;padding:11px 13px;font-size:.8rem}.course-error{display:grid;gap:4px;padding:18px}.course-empty{display:grid;min-height:360px;place-items:center;align-content:center;gap:14px;color:var(--muted)}.loading-ring{display:block;width:28px;height:28px;border:3px solid var(--mist);border-top-color:var(--coral);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:40px clamp(24px,5vw,68px) 80px}.today-hero{display:flex;align-items:end;justify-content:space-between;gap:32px;margin-bottom:32px}.today-hero-copy{min-width:0}.today-hero h1{margin:8px 0 6px;font-size:clamp(2rem,3.2vw,2.9rem);line-height:1.05;letter-spacing:-.02em}.today-hero-copy>p{margin:0;color:var(--muted);font-size:.9rem}.today-hero-meta{display:flex;flex-shrink:0;gap:10px}.today-stat{display:grid;min-width:108px;gap:2px;padding:12px 16px;text-align:left;background:var(--surface);border:1.5px solid var(--line-strong);border-radius:14px}.today-stat strong{font:400 2rem/1 var(--display)}.today-stat span{color:var(--muted);font-size:.66rem;font-weight:600;letter-spacing:.04em;text-transform:uppercase}.today-steps{display:grid;gap:12px;padding:0;margin:0;list-style:none}.today-step{display:grid;grid-template-columns:44px minmax(0,1fr) auto;align-items:center;gap:18px;padding:18px 22px;background:var(--surface);border:1px solid var(--line);border-radius:16px;transition:border-color .14s ease,box-shadow .14s ease,transform .14s ease}.today-step:hover{border-color:var(--line-strong);box-shadow:0 8px 24px #2f2b2712;transform:translateY(-1px)}.today-step.active{background:#fffdf6;border:1.5px solid #e2bda8;box-shadow:0 12px 28px #b958381a}.today-step.done{opacity:.78}.today-step-index{display:grid;width:40px;height:40px;place-items:center;color:var(--muted);background:var(--mist);border-radius:50%;font:700 .86rem var(--body)}.today-step.active .today-step-index{color:#fff;background:var(--coral);box-shadow:0 0 0 4px var(--coral-soft)}.today-step.done .today-step-index{color:#fff;background:var(--green)}.today-step-copy{display:grid;min-width:0;gap:3px}.today-step-label{color:var(--muted);font-size:.64rem;font-weight:700;letter-spacing:.06em;text-transform:uppercase}.today-step.active .today-step-label{color:var(--coral)}.today-step-copy strong{font-family:var(--display);font-size:1.3rem;font-weight:400;letter-spacing:-.01em}.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:.72rem;font-weight:600}.today-step-cta{min-width:170px;justify-content:center;white-space:nowrap}.today-step.done .today-step-cta{min-width:0;padding:7px 12px;color:var(--muted);border-color:var(--line)}.today-after{margin-top:34px;padding:24px 26px;background:var(--rail);border:1px solid var(--line);border-radius:16px}.today-after h2{margin:0 0 4px;font-size:1.1rem;font-weight:600}.today-after p{margin:0 0 14px;color:var(--muted);font-size:.8rem}.today-after>div{display:flex;flex-wrap:wrap;gap:10px}.today-after .secondary-action{background:var(--surface)}@media(max-width:860px){.today-view{padding:26px 16px 70px}.today-hero{align-items:stretch;flex-direction:column}.today-hero-meta{display:grid;grid-template-columns:1fr 1fr}.today-step{grid-template-columns:36px minmax(0,1fr);padding:16px 18px}.today-step-side{grid-column:1 / -1;justify-content:space-between}.today-step-cta{flex:1;min-width:0}}@media(max-width:560px){.today-step-copy strong{font-size:1.15rem}.today-stat{min-width:0}}.course-view{padding:30px 0 0}.course-hero{display:flex;align-items:center;justify-content:space-between;gap:32px;max-width:1480px;margin:0 auto;padding:30px clamp(28px,4vw,40px);color:var(--ink);background:var(--surface);border:1px solid var(--line);border-left:4px solid var(--coral);border-radius:16px;box-shadow:0 10px 30px #2f2b270f;margin-right:clamp(28px,5vw,72px);margin-left:clamp(28px,5vw,72px)}.course-hero-copy{align-self:auto;max-width:680px;min-width:0}.course-hero h1{max-width:720px;margin:8px 0 6px;font-size:clamp(1.9rem,2.8vw,2.6rem);line-height:1.08;letter-spacing:-.02em}.course-hero-copy>p{margin:0;color:var(--muted);font-size:.86rem;line-height:1.5}.course-hero-actions{display:grid;flex-shrink:0;justify-items:end;gap:12px}.hero-secondary{display:flex;gap:10px}.hero-secondary button{min-height:38px;padding:7px 12px;font-size:.75rem}.hero-action{min-width:190px;justify-content:center;color:#fff;background:var(--coral);box-shadow:0 4px 16px #b958384d}.demo-course-note{margin:18px 0;color:var(--muted);font-size:.72rem}.hero-action:hover:not(:disabled){color:#fff;background:#a94f34}.path-section{max-width:1480px;margin:0 auto;padding:34px clamp(28px,5vw,72px) 84px}.path-header{display:flex;align-items:end;justify-content:space-between;gap:24px}.path-header h2{margin:6px 0 0;font-size:2rem;line-height:1.1}.level-switch{display:flex;padding:3px;background:var(--mist);border-radius:9px}.level-switch button{min-width:48px;height:34px;color:var(--muted);background:transparent;border-radius:7px;font-weight:500}.level-switch button.active{color:#fff;background:var(--navy)}.level-progress-line{display:flex;align-items:center;gap:16px;margin:22px 0 20px;color:var(--muted);font-size:.74rem;font-weight:500}.level-progress-line>i{display:block;flex:1;max-width:280px;height:8px;background:var(--mist);border-radius:8px;overflow:hidden}.level-progress-line>i b{display:block;height:100%;background:var(--coral);border-radius:8px;transition:width .22s ease}.lesson-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.lesson-tile{display:grid;grid-template-columns:44px minmax(0,1fr) auto;min-height:142px;gap:14px;padding:21px;background:var(--surface);border:1px solid var(--line);border-radius:14px;transition:border-color .12s ease,box-shadow .12s ease,transform .12s ease}.lesson-tile:hover{border-color:var(--line-strong);box-shadow:0 8px 24px #2f2b2712;transform:translateY(-1px)}.lesson-tile.ready{background:#fffdf6;border-color:#e2bda8;border-width:1.5px;box-shadow:0 10px 26px #b958381a}.lesson-tile.later{background:#f6f5f2}.lesson-number{display:flex;flex-direction:column;align-items:center;gap:8px;color:var(--muted);font:600 .68rem var(--body)}.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(--green)}.lesson-tile.ready .lesson-number i{background:var(--coral);box-shadow:0 0 0 4px var(--coral-soft)}.lesson-tile-copy>span{color:var(--coral);font-size:.62rem;font-weight:600;letter-spacing:.07em;text-transform:uppercase}.lesson-tile h3{margin:6px 0 12px;font-size:1.3rem}.lesson-tile p{display:none}.lesson-tile-copy>div{display:flex;flex-wrap:wrap;gap:4px}.lesson-tile-copy small{padding:3px 6px;color:var(--muted);background:var(--bench);border-radius:4px;font-size:.6rem}.tile-action{align-self:end;display:inline-flex;align-items:center;gap:5px;min-height:38px;padding:7px 13px;color:var(--coral);background:transparent;border:1.5px solid var(--coral);border-radius:9px;font-size:.76rem;font-weight:700;transition:background .12s ease,color .12s ease}.tile-action:hover{color:#fff;background:var(--coral)}.lesson-locked{align-self:end;display:inline-flex;align-items:center;gap:6px;min-height:34px;padding:6px 12px;color:var(--muted);background:var(--mist);border-radius:9px;font-size:.72rem;font-weight:600}.lesson-tile.complete .tile-action{color:var(--muted);border-color:var(--line-strong)}.lesson-tile.complete .tile-action:hover{color:var(--ink)}.scene-canvas{position:relative;min-width:0;margin:0;background:var(--surface);border:1px solid var(--line);border-radius:16px;overflow:hidden;box-shadow:0 8px 24px 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