@import "https://fonts.googleapis.com/css2?family=Geist:wght@400;500;600;700;800&family=Newsreader:opsz,wght@6..72,600;6..72,700&display=swap";:root{--bg:#f7f6f3;--paper:#fffefb;--ink:#24221f;--muted:#6f6a61;--faint:#ece9e2;--line:#dfdbd2;--hover:#efede7;--accent:#9a6a3a;--blue:#36c;--green:#2f7d4c}*{box-sizing:border-box}body{background:var(--bg);color:var(--ink);margin:0;font-family:Geist,ui-sans-serif,system-ui,sans-serif}.workspace{grid-template-columns:310px minmax(0,1fr);min-height:100vh;display:grid}.sidebar{border-right:1px solid var(--line);background:#f1f0ec;flex-direction:column;gap:14px;height:100vh;padding:16px 12px;display:flex;position:sticky;top:0}.workspaceName{align-items:center;gap:9px;padding:9px 10px;font-size:16px;font-weight:800;display:flex}.search{color:var(--muted);background:#e8e6df;border-radius:8px;align-items:center;gap:9px;padding:9px 10px;font-size:13px;display:flex}.lessonNav{flex-direction:column;gap:4px;display:flex}.lessonNav p{color:#8a8478;text-transform:uppercase;letter-spacing:.08em;margin:12px 10px 6px;font-size:11px;font-weight:800}.lessonNav button{color:var(--ink);text-align:left;cursor:pointer;font:inherit;background:0 0;border:0;border-radius:9px;grid-template-columns:28px 1fr;align-items:flex-start;gap:8px;padding:8px 9px;display:grid}.lessonNav button:hover,.lessonNav button.active{background:var(--hover)}.lessonNav button.active{box-shadow:inset 3px 0 var(--accent)}.pageIcon{border:1px solid var(--line);width:22px;height:22px;color:var(--muted);background:#fff;border-radius:6px;place-items:center;display:grid}.lessonNav b{margin-bottom:2px;font-size:13px;display:block}.lessonNav span{-webkit-line-clamp:2;color:var(--muted);-webkit-box-orient:vertical;font-size:12px;line-height:1.25;display:-webkit-box;overflow:hidden}.sidebarFooter{color:var(--muted);align-items:center;gap:8px;margin-top:auto;padding:10px;font-size:12px;display:flex}.contentShell{min-width:0}.topbar{border-bottom:1px solid var(--faint);-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);z-index:5;background:#fffefbb8;justify-content:space-between;align-items:center;height:48px;padding:0 clamp(18px,5vw,70px);display:flex;position:sticky;top:0}.topbar span{color:var(--green);font-size:12px;font-weight:800}.topbar b{color:var(--muted);font-size:12px}.lessonPage,.emptyState{max-width:1220px;margin:0 auto;padding:54px clamp(18px,5vw,70px) 80px}.docHeader{max-width:880px}.docIcon{border:1px solid var(--line);width:64px;height:64px;color:var(--accent);background:#f0e7da;border-radius:16px;place-items:center;margin-bottom:18px;display:grid}.kicker,.sectionLabel{color:var(--muted);text-transform:uppercase;letter-spacing:.1em;margin:0 0 10px;font-size:12px;font-weight:800}h1,h2,h3{color:var(--ink);margin:0}h1{letter-spacing:-.055em;font-family:Newsreader,serif;font-size:clamp(44px,6.5vw,78px);line-height:.94}h2{letter-spacing:-.035em;margin-bottom:15px;font-family:Newsreader,serif;font-size:clamp(28px,3vw,42px)}h3{letter-spacing:-.02em;font-size:17px}.intro{color:var(--muted);max-width:820px;font-size:19px;line-height:1.65}.callout,.lockedBanner{background:#fff8dc;border:1px solid #eadfba;border-radius:12px;gap:14px;max-width:860px;margin:34px 0;padding:16px 18px;display:flex}.lockedBanner{border:1px dashed var(--line);color:var(--muted);background:#f4f1ea;border-radius:12px;align-items:center;max-width:860px;margin:24px 0 0;padding:13px 16px}.callout p{color:var(--muted);margin:4px 0 0;line-height:1.55}.twoCol{grid-template-columns:minmax(0,.9fr) minmax(320px,.7fr);gap:20px;margin:34px 0 42px;display:grid}.noteList,.formulaBox,.exampleCard{background:var(--paper);border:1px solid var(--line);border-radius:14px}.noteList{padding:8px}.note{border-bottom:1px solid var(--faint);padding:14px 13px}.note:last-child{border-bottom:0}.note b{margin-bottom:5px;display:block}.note p{color:var(--muted);margin:0;line-height:1.55}.bigPrompt{color:#3f3b35;border-left:3px solid var(--accent);background:#f7f6f3;border-radius:0 8px 8px 0;padding:12px 14px;line-height:1.6}.activity{border:1px solid var(--faint);color:var(--muted);background:#fff;border-radius:10px;margin-top:16px;padding:12px;line-height:1.5}.formulaBox{padding:22px}.formulaBox p{color:var(--muted);line-height:1.65}.examplesGrid{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin-top:16px;display:grid}.exampleCard{padding:18px;transition:all .18s}.exampleCard:hover{transform:translateY(-2px);box-shadow:0 12px 30px #24221f12}.exampleTop{color:var(--accent);text-transform:uppercase;letter-spacing:.06em;align-items:center;gap:8px;margin-bottom:12px;font-size:12px;font-weight:800;display:flex}.prompt{color:#3f3b35;border-left:3px solid var(--line);background:#f7f6f3;border-radius:0 8px 8px 0;margin:12px 0;padding:10px 12px;line-height:1.55}.benefit{color:var(--green);margin-bottom:0;font-weight:700;line-height:1.4}.emptyState{flex-direction:column;justify-content:center;max-width:800px;min-height:calc(100vh - 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