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var(--line);border-radius:var(--r-4);background:var(--bg-1);flex-direction:column;padding:28px;display:flex}.path-card-dim{opacity:.45}.path-book{text-align:left;width:100px;color:inherit;background:0;flex-direction:column;gap:10px;padding:0;transition:transform .2s;display:flex}.path-book .book-cover{width:100%;box-shadow:none;background:0 0}.path-book-title{color:var(--ink-2);letter-spacing:-.005em;-webkit-line-clamp:2;-webkit-box-orient:vertical;font-size:11.5px;line-height:1.35;display:-webkit-box;overflow:hidden}.path-book:hover{transform:translateY(-2px)}.path-book:hover .path-book-title{color:var(--ink)}.lesson-screen{background:var(--bg);grid-template-columns:280px 1fr 320px;height:100%;min-height:0;transition:grid-template-columns .24s cubic-bezier(.4,0,.2,1);display:grid}.lesson-screen.tutor-open{grid-template-columns:280px 1fr 380px}.lesson-screen.tools-collapsed{grid-template-columns:280px 1fr 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.outline-sec-num{color:var(--acc)}.outline-sec-title{flex:1;line-height:1.4}.outline-sec-tag{background:var(--panel-3);color:var(--ink-3);letter-spacing:.08em;border-radius:3px;padding:1px 5px;font-size:9px}.lesson-main{background:var(--paper);color:var(--paper-ink);justify-content:center;padding:0 0 50px;display:flex;overflow-y:auto}.lesson-reader{background:var(--paper);color:var(--paper-ink);box-shadow:none;width:100%;max-width:760px;font-family:var(--font-sans);border-radius:0;padding:56px 64px 50px;font-size:15.5px;line-height:1.7}.lesson-screen[data-reader-bg=cream] .lesson-main,.lesson-screen[data-reader-bg=cream] .lesson-reader{background:#faf8f2}.lesson-screen[data-reader-bg=dark] .lesson-main,.lesson-screen[data-reader-bg=dark] .lesson-reader{background:var(--bg);color:var(--ink-1)}.lesson-screen[data-reader-bg=dark] .reader-title{color:var(--ink)}.lesson-screen[data-reader-bg=dark] h2,.lesson-screen[data-reader-bg=dark] .lesson-reader p,.lesson-screen[data-reader-bg=dark] .lesson-reader li,.lesson-screen[data-reader-bg=dark] .lead{color:var(--ink-1)}.lesson-screen[data-reader-bg=dark] code:not(.codeblock-body code){background:var(--panel-2);color:var(--acc-2)}.lesson-screen[data-reader-bg=dark] .callout-info{color:var(--ink-1);background:#22d3ee0f;border-color:#22d3ee2e}.lesson-screen[data-reader-bg=dark] .practice{background:var(--panel-2);border-color:var(--line-2);color:var(--ink)}.lesson-screen[data-reader-bg=dark] .practice-q{color:var(--ink-1)}.lesson-screen[data-reader-bg=dark] .practice-opt{background:var(--panel);border-color:var(--line-2);color:var(--ink-1)}.lesson-screen[data-reader-bg=dark] .reader-trail span:not(.cur),.lesson-screen[data-reader-bg=dark] .reader-sub{color:var(--ink-3)}.lesson-screen[data-reader-bg=dark] .reader-foot{border-color:var(--line-2)}.reader-head{border-bottom:1px solid 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var(--line);background:var(--bg);flex-direction:column;min-height:0;padding:0;display:flex;overflow:hidden}.lesson-screen.tutor-open .reader-tools{display:none}.tools-section{border-bottom:1px solid var(--line);flex-shrink:0;padding:20px 18px 18px}.tools-header{justify-content:space-between;align-items:baseline;margin-bottom:10px;display:flex}.tools-row{gap:8px;display:flex}.tools-toggle{border:1px solid var(--line-2);border-radius:var(--r-2);color:var(--ink-2);flex:1;align-items:center;gap:8px;padding:9px 12px;font-size:12px;transition:all .12s;display:flex}.tools-toggle:hover{background:var(--panel-2);color:var(--ink)}.tools-toggle.on{background:var(--acc-soft);color:var(--acc);border-color:#22d3ee52}.tools-tabs{border-bottom:1px solid var(--line);flex-shrink:0;padding:0 8px;display:flex}.tools-tab{color:var(--ink-3);align-items:center;gap:6px;padding:12px;font-size:12px;transition:color 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