@import url(https://fonts.googleapis.com/css2?family=Fraunces:ital,wght@0,400;0,600;0,700;1,400&family=Plus+Jakarta+Sans:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap);#root{display:flex;flex-direction:column;min-height:100vh}:root{--bg:#f5f6fa;--bg2:#fff;--bg3:#eef0f8;--ink:#0d1117;--ink2:#4a5260;--ink3:#9099aa;--blue:#1d4ed8;--blue2:#2563eb;--blue3:#3b82f6;--blue-soft:#eff4ff;--blue-mid:#dbeafe;--orange:#ea580c;--orange-soft:#fff7ed;--border:#e4e7f0;--border2:#c8cdd8;--shadow:0 1px 3px #0000000f,0 4px 16px #0000000a;--shadow2:0 2px 8px #1d4ed81f,0 8px 32px #1d4ed814}body,html{height:100%;margin:0;padding:0}body,html{overflow-x:hidden}html{scroll-behavior:smooth}body{-webkit-font-smoothing:antialiased;color:#0d1117;color:var(--ink);font-family:Inter,sans-serif;overflow-x:hidden}main{flex:1 1}.cdh-footer{flex-shrink:0;margin-bottom:0;margin-top:auto;padding-bottom:0}.section-tag{color:#1d4ed8;color:var(--blue);font-family:JetBrains 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ease}.fade-up.visible{opacity:1;transform:none}:root{--brand:#1e1b4b;--brand-mid:#312e81;--accent:#e11d48;--gold:#d97706;--surface:#fafaf9;--card:#fff;--border:#e4e4e7;--border-mid:#d4d4d8;--text:#18181b;--muted:#71717a;--soft:#a1a1aa;--blue-bg:#eff6ff;--blue-border:#bfdbfe;--blue-text:#1e40af;--green:#16a34a;--green-bg:#f0fdf4;--green-border:#bbf7d0;--green-text:#166534;--amber-bg:#fffbeb;--amber-border:#fde68a;--amber-text:#92400e;--red:#dc2626;--red-bg:#fef2f2;--red-border:#fecaca;--red-text:#991b1b;--purple-bg:#f5f3ff;--purple-text:#5b21b6;--font-serif:"Fraunces",serif;--font-sans:"Plus Jakarta Sans",sans-serif;--font-mono:"JetBrains Mono",monospace;--max-width:860px;--radius:12px;--radius-sm:8px;--radius-lg:16px;--nav-height:60px}*,:after,:before{box-sizing:border-box;margin:0;padding:0}body{background:#fafaf9;background:var(--surface);color:#18181b;color:var(--text);font-family:Plus Jakarta 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var(--border);border-radius:var(--radius);padding:1.4rem 1.5rem}.block-story p{color:var(--text);font-size:15px;line-height:1.75;margin-bottom:.85rem}.block-story p:last-child{margin-bottom:0}.block-story strong{font-weight:500}.block-story em{font-style:italic}.block-story code{background:var(--surface);border-radius:4px;font-family:var(--font-mono);font-size:13px;padding:1px 6px}.block-concept{background:var(--blue-bg);border:1px solid var(--blue-border);border-radius:var(--radius);padding:1.25rem 1.5rem}.block-concept-label{font-size:11px;font-weight:500;letter-spacing:.08em;opacity:.7;text-transform:uppercase}.block-concept-label,.block-concept-title{color:var(--blue-text);margin-bottom:.5rem}.block-concept-title{font-family:var(--font-serif);font-size:18px;font-weight:700}.block-concept-body{color:#1e40af;font-size:14px;line-height:1.7}.block-concept-analogy{background:#fff9;border-left:3px solid 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var(--green-border);color:var(--green-text)}.lf-no{background:var(--red-bg);border:1.5px solid var(--red-border);color:var(--red-text);font-size:12px}.lf-arrow{align-self:center;color:var(--soft);font-size:20px;padding:0 2px}.lf-sublabel{color:var(--soft);font-size:11px}.block-code{border-radius:10px;overflow:hidden}.block-code-label{color:var(--muted);font-size:12px;margin-bottom:5px}.code-window{background:#0d1117;border-radius:10px;overflow:hidden}.code-window-bar{align-items:center;background:#161b22;display:flex;gap:6px;padding:8px 14px}.code-window-lang{color:#a78bfa;font-family:var(--font-mono);font-size:11px;font-weight:500;letter-spacing:.04em;margin-left:auto;text-transform:uppercase}.code-dot{border-radius:50%;height:10px;width:10px}.code-dot-r{background:#ff5f57}.code-dot-y{background:#febc2e}.code-dot-g{background:#28c840}.code-window-body{color:#e6edf3;font-family:Courier New,monospace;font-size:12px;line-height:1.75;overflow-x:auto;padding:13px 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.15s}.quiz-opt:hover:not(:disabled){background:#ebf2ff;border-color:#1a3faa}.quiz-opt.correct{background:#f0fdf4;border-color:#16a34a;color:#15803d}.quiz-opt.wrong{background:#fef2f2;border-color:#dc2626;color:#991b1b}.quiz-opt:disabled{cursor:default}.quiz-feedback{border-radius:8px;font-size:12px;line-height:1.6;margin-top:10px;padding:8px 12px}.quiz-feedback.ok{background:#f0fdf4;color:#15803d}.quiz-feedback.no{background:#fef2f2;color:#991b1b}.block-text p{color:#2d2d2d;font-size:16px;line-height:1.85;margin-bottom:12px}.block-text p:last-child{margin-bottom:0}.block-text strong{font-weight:600}.block-text em{font-style:italic}.block-text code{background:#f0ede8;border-radius:4px;font-family:var(--font-mono);font-size:13px;padding:1px 5px}.block-callout{border-left:3px solid;border-radius:0 10px 10px 0;line-height:1.7;padding:.9rem 1.1rem}.callout-aha{background:var(--amber-bg);border-color:var(--gold);color:var(--amber-text)}.callout-insight{background:var(--blue-bg);border-color:#3b82f6;color:var(--blue-text)}.callout-power{background:var(--green-bg);border-color:var(--green);color:var(--green-text)}.callout-soft{background:var(--purple-bg);border-color:#7c3aed;color:var(--purple-text)}.callout-blue{background:#ebf2ff;border-color:#1a3faa}.callout-amber{background:#fffbeb;border-color:#f59e0b}.callout-green{background:#f0fdf4;border-color:#16a34a}.callout-purple{background:#f5f3ff;border-color:#7c3aed}.callout-head{align-items:center;display:flex;gap:7px;margin-bottom:5px}.callout-icon{flex-shrink:0;font-size:17px;line-height:1}.callout-label{font-size:10px;font-weight:700;letter-spacing:.08em;text-transform:uppercase}.callout-blue .callout-icon,.callout-blue .callout-label{color:#1a3faa}.callout-amber .callout-icon{color:#d97706}.callout-amber .callout-label{color:#92400e}.callout-green .callout-icon,.callout-green .callout-label{color:#16a34a}.callout-purple .callout-icon,.callout-purple .callout-label{color:#7c3aed}.callout-legacy-label{font-size:11px;font-weight:500;letter-spacing:.08em;margin-bottom:4px;opacity:.7;text-transform:uppercase}.callout-body{color:#374151;font-size:12px;line-height:1.75}.block-callout-card{background:#fff;border:1px solid #e8e4dc;border-radius:12px;display:flex;flex-direction:column;gap:6px;padding:1rem}.callout-card-title{color:#888;font-family:var(--font-mono);font-size:10px;font-weight:700;letter-spacing:.08em;margin-bottom:2px;text-transform:uppercase}.block-cta{background:var(--brand);border-radius:var(--radius-lg);padding:2.25rem 2rem;text-align:center}.cta-badge{background:#ffffff1a;border-radius:20px;color:#ffffffb3;display:inline-block;font-size:11px;letter-spacing:.1em;margin-bottom:1rem;padding:3px 12px;text-transform:uppercase}.block-cta h3{color:#fff;font-family:var(--font-serif);font-size:22px;font-weight:700;margin-bottom:.5rem}.block-cta p{color:#fff9;font-size:14px;line-height:1.65;margin:0 auto 1.5rem;max-width:420px}.cta-btn{background:var(--accent);border:none;border-radius:10px;color:#fff;display:inline-block;font-size:14px;font-weight:500;padding:11px 26px;text-decoration:none;transition:opacity .2s}.cta-btn:hover{opacity:.88}.block-thoughts{display:flex;flex-direction:column;gap:7px}.thought-item{align-items:center;background:var(--card);border:1px solid var(--border);border-radius:var(--radius-sm);display:flex;font-size:14px;gap:10px;padding:10px 14px}.thought-icon{flex-shrink:0;font-size:16px}.thought-text{color:var(--text);flex:1 1}.thought-tag{border-radius:12px;flex-shrink:0;font-size:11px;font-weight:500;padding:2px 9px}.tag-blue{background:var(--blue-bg);color:var(--blue-text)}.tag-green{background:var(--green-bg);color:var(--green-text)}.tag-amber{background:var(--amber-bg);color:var(--amber-text)}.block-table{border:1px solid var(--border);border-radius:var(--radius);overflow-x:auto}.block-table table{border-collapse:collapse;font-size:14px;width:100%}.block-table th{background:var(--brand);color:#ffffffd9;font-size:12px;font-weight:500;letter-spacing:.04em;padding:9px 14px;text-align:left}.block-table td{border-bottom:1px solid var(--border);padding:9px 14px}.block-table tr:last-child td{border-bottom:none}.block-table tr:nth-child(2n) td{background:#fafaff}.block-varboxes{display:flex;flex-wrap:wrap;gap:8px}.var-box{background:var(--card);border:1.5px solid var(--border);border-radius:10px;flex:1 1;min-width:110px;overflow:hidden;text-align:center}.var-box-type{background:var(--brand);color:#fff9;font-size:10px}.var-box-name,.var-box-type{font-family:var(--font-mono);padding:4px 6px}.var-box-name{background:var(--surface);color:var(--muted);font-size:11px}.var-box-value{color:var(--text);font-family:var(--font-mono);font-size:15px;font-weight:500;padding:10px 6px}.var-box-value.green{color:var(--green)}.block-beforeafter{grid-gap:10px;display:grid;gap:10px;grid-template-columns:1fr 1fr}.ba-col{border-radius:var(--radius-sm);font-size:13px;line-height:1.75;padding:1rem 1.1rem}.ba-col.before{background:var(--red-bg);border:1px solid var(--red-border)}.ba-col.after{background:var(--green-bg);border:1px solid var(--green-border)}.ba-col-label{font-size:11px;font-weight:500;letter-spacing:.07em;margin-bottom:.5rem;text-transform:uppercase}.ba-col.before .ba-col-label{color:var(--red)}.ba-col.after .ba-col-label{color:var(--green)}.ba-col ul{padding-left:1.1rem}.ba-col li{margin-bottom:3px}.ba-col li.last-red{color:var(--red);font-weight:500}.ba-col li.last-green{color:var(--green);font-weight:500}.block-timeline{display:flex;flex-direction:column}.tl-step{align-items:flex-start;display:flex;gap:12px;padding-bottom:18px;position:relative}.tl-step:last-child{padding-bottom:0}.tl-step:before{background:var(--border);content:"";height:calc(100% - 14px);left:14px;position:absolute;top:30px;width:2px}.tl-step:last-child:before{display:none}.tl-dot{align-items:center;background:var(--card);border:2px solid var(--brand);border-radius:50%;color:var(--brand);display:flex;flex-shrink:0;font-size:12px;font-weight:500;height:30px;justify-content:center;width:30px;z-index:1}.tl-dot.done{background:var(--brand);color:#fff}.tl-content{padding-top:4px}.tl-title{font-size:14px;font-weight:500;margin-bottom:2px}.tl-desc{color:var(--muted);font-size:13px;line-height:1.6}.block-exercises{display:flex;flex-direction:column;gap:12px}.ex-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:1.25rem}.ex-num{color:var(--accent);font-size:11px;font-weight:500;letter-spacing:.08em;margin-bottom:.35rem;text-transform:uppercase}.ex-task{font-size:15px;font-weight:500;margin-bottom:.5rem}.ex-hint{color:var(--muted);font-size:13px;margin-bottom:.75rem}.ex-toggle{background:none;border:1.5px solid var(--border);border-radius:7px;color:var(--muted);font-size:12px;padding:6px 14px;transition:all .15s}.ex-toggle:hover{border-color:var(--accent);color:var(--accent)}.ex-answer{background:var(--surface);border-radius:8px;font-size:13px;line-height:1.7;margin-top:.75rem;padding:.85rem 1rem}.ex-answer code{background:var(--border);border-radius:4px;font-family:var(--font-mono);font-size:12px;padding:1px 6px}.block-checklist{display:flex;flex-direction:column;gap:10px}.check-item{align-items:flex-start;display:flex;font-size:14px;gap:10px;line-height:1.65}.check-icon{align-items:center;border-radius:50%;display:flex;flex-shrink:0;font-size:11px;font-weight:500;height:22px;justify-content:center;margin-top:1px;width:22px}.icon-yes{background:var(--green-bg);color:var(--green)}.icon-no{background:var(--red-bg);color:var(--red)}.icon-arrow{background:var(--amber-bg);color:var(--gold)}.block-image{background:#fff;border:1px solid #e8e4dc;border-radius:10px;overflow:hidden}.block-image-header{align-items:center;background:#fafaf8;border-bottom:1px solid #f0ede8;display:flex;gap:7px;padding:8px 12px}.block-image-header-icon{color:#1a3faa;font-size:14px}.block-image-header-label{color:#888;font-size:9px;font-weight:700;letter-spacing:.09em;text-transform:uppercase}.block-image img{display:block;width:100%}.block-image-caption{align-items:flex-start;background:#fff;border-top:1px solid 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