.focus-lesson .skip-link{position:fixed;top:-100px;left:16px;z-index:50;background:var(--surface);padding:12px}.focus-lesson .skip-link:focus{top:8px}.learn-brand{display:flex;gap:12px;align-items:center;text-decoration:none;color:var(--ink)}.brand-symbol{display:grid;place-items:center;width:34px;height:34px;border-radius:10px;background:var(--accent);color:var(--on-accent)}.learn-brand>span{border-left:1px solid var(--line);padding-left:12px}.focus-lesson>header{min-height:76px;position:sticky;top:0;z-index:10;padding:14px 28px}.focus-lesson .shell{grid-template-columns:244px minmax(0,1fr);min-height:calc(100dvh - 76px)}.course-sidebar{background:var(--surface);border-right:1px solid var(--line);padding:24px 14px}.course-sidebar>details{position:sticky;top:100px}.course-sidebar summary{padding:12px;cursor:pointer}.course-sidebar nav{border:0;padding:0;background:transparent;max-height:none;min-height:0;position:static}.course-sidebar .focus-nav-link{margin:3px 0}.outline-heading{display:flex;align-items:center;justify-content:space-between;border-top:1px solid var(--line);margin-top:24px;padding-top:20px;gap:8px}.outline-heading h2{font:600 13px system-ui;margin:0}.outline-heading button{min-width:40px;padding:5px}.course-sidebar #outline p{font-size:12px;color:var(--muted);margin:20px 12px 8px}.course-sidebar #outline a{font-size:13px;line-height:1.55;padding:10px 12px;border-radius:9px;text-decoration:none;margin:2px 0}.course-sidebar #outline a[aria-current=page]{background:var(--action);border-left:3px solid var(--accent)}.focus-lesson .shell>main{width:100%;max-width:1000px;padding:44px clamp(24px,5vw,76px) 80px;margin:0 auto;min-width:0}.reader-heading{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:12px}.reader-heading button{font-size:13px}.focus-lesson h1{font-size:clamp(28px,3vw,42px);line-height:1.2;margin:24px 0}.focus-lesson #notice{font-size:13px;color:var(--muted);max-width:68ch}.lesson-history{font-size:12px;color:var(--muted);margin:16px 0 28px}.lesson-history summary{cursor:pointer;padding-block:8px}.learning-goal{padding:18px 22px;border-left:3px solid var(--accent);background:var(--action);border-radius:0 10px 10px 0;margin:24px 0}.learning-goal p{margin:8px 0 0;line-height:1.6}.focus-lesson .reading-surface{border:1px solid var(--line);border-radius:16px;padding:28px;background:var(--surface);box-shadow:none}.focus-lesson #material{font-size:17px;line-height:1.85;max-width:70ch}.focus-lesson #material h2{margin:36px 0 14px;font-size:26px}.focus-lesson #material .material-block{background:var(--surface);padding:22px;min-width:0}.focus-lesson #material .material-block.omni-document{padding:0;border:0;background:transparent}.focus-lesson #tasks a{display:inline-block;margin:16px 12px 0 0;padding:10px 15px;border:1px solid var(--line);border-radius:9px;text-decoration:none;background:var(--action)}
#focus-assistant-panel{position:fixed;inset:86px 12px 12px auto;width:400px;max-width:calc(100vw - 24px);height:calc(100dvh - 98px);max-height:none;margin:0;border:1px solid var(--line);border-radius:14px;padding:0;background:var(--surface);color:var(--ink);box-shadow:0 12px 48px #0002;overflow:hidden}#focus-assistant-panel[open]{display:flex;flex-direction:column}.assistant-panel-heading{display:flex;align-items:center;justify-content:space-between;padding:14px 18px;border-bottom:1px solid var(--line);gap:12px}.assistant-panel-heading h2{font:600 17px system-ui;margin:0}.assistant-panel-heading button{font-size:12px}.assistant-panel-hint{font-size:12px;color:var(--muted);margin:12px 18px}#focus-assistant-body{flex:1;min-height:0}#focus-assistant-body iframe{border:0;width:100%;height:100%;display:block}#focus-assistant-panel::backdrop{background:#0007}
.focus-lesson .skip-link:not(:focus){width:1px;height:1px;overflow:hidden;clip-path:inset(50%);padding:0}
.focus-lesson .reading-surface .material-block::before,.focus-lesson #material .material-block.omni-document::before{content:none!important}
.focus-lesson #material .material-block.omni-document{font:inherit;box-shadow:none;background:none}
@media(min-width:1200px){.focus-lesson.assistant-open .shell{margin-right:420px}.course-sidebar>details>summary{display:none}}
@media(max-width:736px){.learn-brand>span{display:none}.focus-lesson>header{position:static;padding:12px 16px;min-height:64px}.focus-lesson .shell{display:block}.course-sidebar{border-right:0;border-bottom:1px solid var(--line);padding:4px 12px}.course-sidebar>details{position:static}.focus-lesson .shell>main{padding:24px 18px 60px}.focus-lesson #material .material-block{padding:14px}.reader-heading button{width:100%}#focus-assistant-panel{inset:8px;width:calc(100vw - 16px);max-width:none;height:calc(100dvh - 16px)}.learning-goal{padding:14px}}