:root{--bg: #0f1012;--surface: #16181c;--surface2: #1c1f24;--code: #14161a;--border: rgba(255, 255, 255, 0.09);--border2: rgba(255, 255, 255, 0.17);--text: #e9eaec;--muted: #9aa0a8;--accent: oklch(0.58 0.17 250);--r: 10px;--rb: 8px}[data-theme=light]{--bg: #fafaf9;--surface: #fff;--surface2: #f1f1ef;--code: #f4f4f2;--border: rgba(16, 18, 22, 0.1);--border2: rgba(16, 18, 22, 0.2);--text: #1b1d21;--muted: #5d6269;--accent: oklch(0.5 0.17 250)}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font-family:"Source Serif 4",Georgia,serif;font-size:16.5px;line-height:1.72}a{color:var(--accent)}.split-pane{display:flex;min-height:100vh}.sidebar{width:230px;flex:none;display:flex;flex-direction:column;background:var(--surface);border-right:1px solid var(--border)}.sidebar .brand{padding:18px 20px 15px;border-bottom:1px solid var(--border)}.sidebar .brand .brand-name{font-family:"JetBrains Mono",ui-monospace,monospace;font-size:13.5px;font-weight:600}.sidebar .brand .brand-name span{color:var(--accent)}.sidebar .brand .brand-sub{margin-top:4px;font-family:"JetBrains Mono",ui-monospace,monospace;font-size:9.5px;color:var(--muted);letter-spacing:.03em}.sidebar .course-kicker{padding:18px 20px 8px;font-family:"JetBrains Mono",ui-monospace,monospace;font-size:9px;font-weight:600;letter-spacing:.16em;color:var(--muted);text-transform:uppercase}.sidebar nav{display:flex;flex-direction:column;gap:2px;padding:0 10px}.sidebar .module{display:flex;align-items:center;gap:10px;padding:8px 10px;border-radius:6px;font-family:"Instrument Sans",system-ui,sans-serif;font-size:12.5px;color:var(--muted);text-decoration:none}.sidebar .module .module-num{font-family:"JetBrains Mono",ui-monospace,monospace;font-size:9.5px}.sidebar .module .module-title{flex:1}.sidebar .module.is-active{background:var(--surface2);font-weight:500;color:var(--text)}.sidebar .module.is-active .module-num{color:var(--accent)}.sidebar .module.is-active .module-dot{width:5px;height:5px;border-radius:50%;background:var(--accent)}.sidebar .module.is-locked{opacity:.6}.sidebar .sidebar-spacer{flex:1}.sidebar .sidebar-cta{padding:14px 16px;border-top:1px solid var(--border);display:flex;flex-direction:column;gap:8px}.btn{font-family:"Instrument Sans",system-ui,sans-serif;font-size:12px;font-weight:500;padding:7px 12px;background:rgba(0,0,0,0);border:1px solid var(--border2);color:var(--text);border-radius:var(--rb);cursor:pointer;text-decoration:none;text-align:center}.btn-primary{font-weight:600;background:var(--accent);border-color:rgba(0,0,0,0);color:#fff}.pane-main{flex:1;min-width:0;display:flex;flex-direction:column}.topbar{display:flex;align-items:center;gap:10px;padding:11px 24px;border-bottom:1px solid var(--border)}.topbar .crumb{font-family:"JetBrains Mono",ui-monospace,monospace;font-size:10px;color:var(--muted)}.topbar .topbar-spacer{flex:1}.preview-pill{display:none;font-family:"JetBrains Mono",ui-monospace,monospace;font-size:9.5px;color:var(--accent);border:1px solid var(--border2);padding:3px 9px;border-radius:999px}.preview-pill[data-visible=true]{display:inline-block}.article{width:100%;max-width:680px;margin:0 auto;padding:40px 44px 52px}.kicker{font-family:"JetBrains Mono",ui-monospace,monospace;font-size:10px;font-weight:600;letter-spacing:.15em;color:var(--accent);text-transform:uppercase}.article h1{margin:14px 0 0;font-family:"Source Serif 4",Georgia,serif;font-size:33px;font-weight:600;letter-spacing:-0.012em;line-height:1.16;text-wrap:pretty}.byline{display:flex;align-items:center;gap:10px;margin:18px 0 26px}.byline .avatar{width:26px;height:26px;border-radius:50%;background:linear-gradient(135deg, var(--accent), var(--surface2))}.byline .byline-meta{font-family:"Instrument Sans",system-ui,sans-serif;font-size:12.5px;color:var(--muted)}.article h2{margin:26px 0 12px;font-family:"Source Serif 4",Georgia,serif;font-size:21px;font-weight:600;letter-spacing:-0.01em}.article p{margin:0 0 18px;text-wrap:pretty}.article pre{margin:0 0 18px;padding:16px 18px;background:var(--code);border:1px solid var(--border);border-radius:calc(var(--r) - 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