:root{color-scheme:light;--paper:#f8fafc;--paper-raised:#fff;--paper-muted:#f1f5f9;--paper-warm:#e2e8f0;--surface-elevated:#fff;--ink:#0f172a;--ink-body:#1e293b;--ink-soft:#475569;--ink-faint:#64748b;--line:#e2e8f0;--line-strong:#cbd5e1;--accent:#2563eb;--accent-soft:#eff6ff;--accent-strong:#1d4ed8;--accent-glow:#2563eb24;--blue:#0284c7;--green:#059669;--amber:#d97706;--warning:#d97706;--warning-soft:#fffbeb;--warning-border:#d97706;--warning-border-subtle:#fde68a;--warning-bg:#fffbeb;--warning-title:#92400e;--warning-ink:#451a03;--important-border:#dc2626;--important-border-subtle:#fecaca;--important-bg:#fef2f2;--important-title:#991b1b;--important-ink:#450a0a;--note-border:#2563eb;--note-border-subtle:#bfdbfe;--note-bg:#f8fbff;--note-title:#1e40af;--tip-border:#059669;--tip-border-subtle:#a7f3d0;--tip-bg:#f0fdf4;--tip-title:#065f46;--explore-border:#6366f1;--explore-border-subtle:#c7d2fe;--explore-bg:#f5f7ff;--explore-title:#3730a3;--error:#dc2626;--error-soft:#fef2f2;--success:#059669;--success-soft:#f0fdf4;--code-bg:#f1f5f9;--code-header-bg:#e2e8f0;--code-ink:#0f172a;--code-line:#cbd5e1;--dot-pattern:#0f172a11;--shadow:0 12px 32px -4px #0f172a14, 0 4px 12px -2px #0f172a0a;--shadow-sm:0 1px 3px #0f172a0f, 0 1px 2px #0f172a0a;--shadow-hover:0 14px 28px -6px #2563eb1f, 0 4px 10px -2px #0f172a0d;--color-bg:var(--paper-muted);--color-surface:var(--paper-raised);--color-border:var(--line);--color-text:var(--ink);--color-muted:var(--ink-soft);--color-accent:var(--accent);--serif:"Newsreader", "Charter", "Bitstream Charter", "Iowan Old Style", Georgia, "Times New Roman", serif;--sans:-apple-system, BlinkMacSystemFont, "Inter", "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;--mono:"JetBrains Mono", "Fira Code", ui-monospace, "SFMono-Regular", Menlo, Monaco, Consolas, monospace;--reading-font-size:17px;--reading-line-height:1.76;--code-font-size:13.75px;--reading-max-width:740px;--reading-max-width-wide:960px;font-family:var(--sans);background:var(--paper);color:var(--ink);font-synthesis:none;text-rendering:optimizelegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}:root[data-theme=dark]{color-scheme:dark;--paper:#0b0f17;--paper-raised:#111827;--paper-muted:#1e293b;--paper-warm:#172033;--surface-elevated:#1e293b;--ink:#f8fafc;--ink-body:#e2e8f0;--ink-soft:#94a3b8;--ink-faint:#7e8c9f;--line:#1e293b;--line-strong:#334155;--accent:#60a5fa;--accent-soft:#60a5fa24;--accent-strong:#93c5fd;--accent-glow:#60a5fa33;--blue:#38bdf8;--green:#34d399;--amber:#fbbf24;--warning:#fbbf24;--warning-soft:#231b0c;--warning-border:#f59e0b;--warning-border-subtle:#453012;--warning-bg:#1c160b;--warning-title:#fcd34d;--warning-ink:#fef3c7;--important-border:#f87171;--important-border-subtle:#4c1d1d;--important-bg:#1f1215;--important-title:#fca5a5;--important-ink:#fee2e2;--note-border:#60a5fa;--note-border-subtle:#1e3a5f;--note-bg:#0f1b2d;--note-title:#93c5fd;--tip-border:#34d399;--tip-border-subtle:#143d2f;--tip-bg:#0d1f1a;--tip-title:#6ee7b7;--explore-border:#818cf8;--explore-border-subtle:#282a54;--explore-bg:#14162b;--explore-title:#a5b4fc;--error:#f87171;--error-soft:#1f1215;--success:#34d399;--success-soft:#0d1f1a;--code-bg:#080c14;--code-header-bg:#111827;--code-ink:#e2e8f0;--code-line:#1e293b;--dot-pattern:#94a3b814;--shadow:0 14px 40px #0000008c;--shadow-sm:0 2px 8px #00000059;--shadow-hover:0 14px 32px -4px #0009, 0 0 0 1px #60a5fa40;--color-bg:var(--paper-muted);--color-surface:var(--paper-raised);--color-border:var(--line);--color-text:var(--ink);--color-muted:var(--ink-soft);--color-accent:var(--accent)}:root[data-font-size=large]{--reading-font-size:19.5px;--reading-line-height:1.84;--code-font-size:15.25px}:root[data-font-size=small]{--reading-font-size:15.5px;--reading-line-height:1.72;--code-font-size:12.75px}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:90px}body{background:var(--paper);min-width:320px;color:var(--ink);margin:0}a{color:inherit;text-decoration:none}button,input{font:inherit}button{color:inherit}::selection{background:var(--accent-soft)}:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.skip-link{z-index:1000;background:var(--paper-raised);border:1px solid var(--line-strong);padding:10px 14px;position:absolute;top:8px;left:-999px}.skip-link:focus{left:10px}.topbar{border-bottom:1px solid var(--line);z-index:30;background:color-mix(in srgb, var(--paper-raised) 88%, transparent);-webkit-backdrop-filter:blur(16px)saturate(180%);justify-content:space-between;align-items:center;height:62px;padding:0 24px;display:flex;position:sticky;top:0;box-shadow:0 1px #0f172a08}.topbar-left{align-items:center;gap:16px;display:flex}.brand{font-family:var(--serif);letter-spacing:-.4px;white-space:nowrap;color:var(--ink);align-items:center;gap:9px;font-size:18.5px;font-weight:600;display:inline-flex}.brand em{color:var(--accent);font-weight:400}.brand-symbol{background:var(--accent-soft);border:1px solid color-mix(in srgb, var(--accent) 28%, transparent);width:24px;height:24px;color:var(--accent);border-radius:6px;justify-content:center;align-items:center;font-size:15px;line-height:1;display:inline-flex}.topbar-nav{align-items:center;gap:4px;display:flex}.topbar-nav-link{color:var(--ink-soft);white-space:nowrap;border-radius:6px;padding:6px 11px;font-size:12.5px;font-weight:500;text-decoration:none;transition:all .15s}.topbar-nav-link:hover{background:var(--paper-muted);color:var(--ink)}.topbar-nav-link.is-active{background:var(--accent-soft);color:var(--accent);font-weight:600}.topbar-edition,.eyebrow,.section-kicker,.sidebar-topline,.sidebar-group-title,.rail-title,.note-mark,.stat-label{font-family:var(--mono);letter-spacing:.09em;color:var(--ink-faint);font-size:10px;font-weight:600}.topbar-actions{align-items:center;gap:8px;display:flex}.topbar-tool-link{color:var(--ink-soft);border:1px solid var(--line);background:var(--paper-raised);white-space:nowrap;border-radius:6px;align-items:center;gap:5px;padding:6px 10px;font-size:11.5px;font-weight:500;text-decoration:none;transition:all .15s;display:inline-flex}.topbar-tool-link:hover,.topbar-tool-link.is-active{border-color:var(--accent);color:var(--accent);background:var(--accent-soft)}.search-trigger{border:1px solid var(--line);min-width:210px;color:var(--ink-faint);background:var(--paper-muted);cursor:pointer;border-radius:6px;justify-content:space-between;align-items:center;gap:16px;padding:6px 9px 6px 11px;font-size:12px;transition:all .15s;display:flex}.search-trigger-label{align-items:center;gap:8px;display:flex}kbd{font:10px var(--mono);border:1px solid var(--line-strong);background:var(--paper-raised);color:var(--ink-soft);border-radius:4px;padding:2px 5px}.icon-button{border:1px solid var(--line);background:var(--paper-raised);cursor:pointer;min-width:34px;height:34px;color:var(--ink-soft);border-radius:6px;padding:0 8px;transition:all .15s}.icon-button:hover,.search-trigger:hover{border-color:var(--accent);color:var(--accent);background:var(--paper-raised)}.mobile-menu-toggle{display:none}.reading-progress-bar{background:linear-gradient(90deg, var(--accent), var(--blue));z-index:45;width:0%;height:2.5px;transition:width 80ms linear;position:fixed;top:62px;left:0}@media (width<=760px){.reading-progress-bar{top:56px}}.app-shell{grid-template-columns:250px minmax(0,1fr) 220px;gap:0;max-width:1480px;min-height:calc(100vh - 62px);margin:0 auto;transition:grid-template-columns .22s cubic-bezier(.16,1,.3,1);display:grid}.app-shell.no-rail,.app-shell.toc-collapsed,:root[data-toc-state=collapsed] .app-shell{grid-template-columns:250px minmax(0,1fr)}.app-shell.sidebar-collapsed,:root[data-sidebar-state=collapsed] .app-shell{grid-template-columns:0 minmax(0,1fr) 220px}.app-shell.sidebar-collapsed.no-rail,.app-shell.sidebar-collapsed.toc-collapsed,:root[data-sidebar-state=collapsed] .app-shell.no-rail,:root[data-sidebar-state=collapsed] .app-shell.toc-collapsed,:root[data-toc-state=collapsed] .app-shell.sidebar-collapsed,:root[data-sidebar-state=collapsed][data-toc-state=collapsed] .app-shell{grid-template-columns:minmax(0,1fr)}.sidebar{border-right:1px solid var(--line);scrollbar-width:thin;width:250px;height:calc(100vh - 62px);padding:14px 12px 28px 14px;transition:width .22s cubic-bezier(.16,1,.3,1),opacity .2s,padding .22s;position:sticky;top:62px;overflow-y:auto}@media (width>=761px){.app-shell.sidebar-collapsed .sidebar,:root[data-sidebar-state=collapsed] .app-shell .sidebar{opacity:0;pointer-events:none;border-right:none;width:0;padding:0;overflow:hidden}}.app-shell.toc-collapsed .right-rail,:root[data-toc-state=collapsed] .app-shell .right-rail{display:none}.sidebar-header{border-bottom:1px solid var(--line);margin-bottom:6px;padding:2px 2px 8px}.sidebar-header-row{justify-content:space-between;align-items:center;display:flex}.sidebar-topline{font-family:var(--mono);letter-spacing:.09em;color:var(--ink-faint);text-transform:uppercase;margin:0;font-size:9.5px;font-weight:700}.sidebar-progress-pill{background:var(--paper-muted);border:1px solid var(--line);font-size:9.5px;font-family:var(--mono);color:var(--accent);border-radius:10px;align-items:center;padding:2px 6px;text-decoration:none;transition:all .15s;display:inline-flex}.sidebar-progress-pill:hover{border-color:var(--accent);background:var(--accent-soft)}.sidebar-progress-count{font-family:var(--mono);font-size:9.5px}.sidebar-progress-bar-mini{background:var(--line);border-radius:2px;height:2px;margin-top:6px;overflow:hidden}.sidebar-progress-bar-mini span{background:var(--green);height:100%;transition:width .3s;display:block}.sidebar-quick-nav{border-bottom:1px solid var(--line);align-items:center;gap:3px;margin-bottom:6px;padding:2px 0 8px;display:flex}.sidebar-quick-link{color:var(--ink-soft);background:var(--paper-raised);border:1px solid var(--line);border-radius:4px;flex:1;justify-content:center;align-items:center;gap:4px;padding:4px 2px;font-size:10.5px;font-weight:500;text-decoration:none;transition:all .15s;display:flex}.sidebar-quick-link:hover,.sidebar-quick-link.is-active{border-color:var(--accent);color:var(--accent);background:var(--paper-muted)}.sidebar-quick-link .nav-mark{font-size:10px}.sidebar-mobile-hubs{border-bottom:1px solid var(--line);margin-bottom:12px;padding-bottom:8px;display:none}.sidebar-nav-section-title{font-family:var(--mono);letter-spacing:.08em;color:var(--ink-faint);text-transform:uppercase;margin:6px 4px 4px;font-size:9px;font-weight:700}.sidebar-home{color:var(--ink-soft);border-radius:4px;align-items:center;gap:7px;margin-bottom:1px;padding:4px 6px;font-size:11px;text-decoration:none;display:flex}.sidebar-home:hover,.sidebar-home.is-active{background:var(--paper-muted);color:var(--accent)}.nav-mark{width:14px;color:var(--accent);text-align:center;font-size:11px}.sidebar-parts-list{flex-direction:column;gap:2px;display:flex}.sidebar-track-details{border-bottom:1px solid var(--line);margin:1px 0;padding-bottom:4px}.sidebar-track-details:last-of-type{border-bottom:none}.sidebar-track-summary{cursor:pointer;font-family:var(--mono);letter-spacing:.06em;color:var(--ink-faint);text-transform:uppercase;user-select:none;border-radius:4px;justify-content:space-between;align-items:center;padding:4px 5px;font-size:9.5px;list-style:none;display:flex}.sidebar-track-summary::-webkit-details-marker{display:none}.sidebar-track-summary:hover{background:var(--paper-muted);color:var(--ink)}.sidebar-track-left{align-items:center;gap:6px;min-width:0;display:flex;overflow:hidden}.sidebar-track-left span{color:var(--accent);flex-shrink:0;font-size:9px;font-weight:700}.sidebar-track-left strong{color:var(--ink);text-overflow:ellipsis;white-space:nowrap;font-weight:600;overflow:hidden}.sidebar-chevron{color:var(--ink-faint);flex-shrink:0;font-size:7px;transition:transform .18s}details[open]>summary .sidebar-chevron{transform:rotate(90deg)}.sidebar-track-content{margin-top:1px;padding-left:2px}.sidebar-lesson-direct{color:var(--ink-soft);border-radius:4px;align-items:center;gap:6px;padding:3px 5px;font-size:11px;font-weight:500;line-height:1.3;text-decoration:none;transition:background .15s,color .15s;display:flex}.sidebar-lesson-direct:hover,.sidebar-lesson-direct.is-active{background:var(--paper-muted);color:var(--accent)}.sidebar-lesson-direct.is-active{font-weight:600}.sidebar-lesson-direct.is-completed{color:var(--ink-soft)}.sidebar-lesson-direct.is-completed .sidebar-status{color:var(--green)}.sidebar-module-details{margin:1px 0}.sidebar-module-summary{color:var(--ink-soft);cursor:pointer;user-select:none;border-radius:4px;justify-content:space-between;align-items:center;padding:3px 5px;font-size:11px;font-weight:500;line-height:1.3;list-style:none;display:flex}.sidebar-module-summary::-webkit-details-marker{display:none}.sidebar-module-summary:hover,.sidebar-module-summary.is-active{background:var(--paper-muted);color:var(--accent)}.sidebar-module-summary.is-active{font-weight:600}.sidebar-module-summary a{color:inherit;flex:1}.sidebar-module-chevron{color:var(--ink-faint);flex-shrink:0;font-size:7px;transition:transform .15s}details[open]>summary .sidebar-module-chevron{transform:rotate(90deg)}.sidebar-lessons{border-left:1px solid var(--line);flex-direction:column;gap:1px;margin:1px 0 3px 8px;padding-left:6px;display:flex}.sidebar-lesson{color:var(--ink-faint);border-radius:3px;align-items:baseline;gap:5px;padding:2.5px 4px;font-size:10.5px;line-height:1.3;text-decoration:none;transition:all .15s;display:flex}.sidebar-lesson:hover,.sidebar-lesson.is-active{color:var(--accent);background:var(--accent-soft)}.sidebar-lesson.is-active{font-weight:600}.sidebar-lesson.is-completed{color:var(--ink-soft)}.sidebar-lesson.is-completed .sidebar-status{color:var(--green)}.sidebar-lesson.is-in-progress .sidebar-status,.sidebar-lesson-direct.is-in-progress .sidebar-status{color:var(--accent)}.sidebar-status{width:8px;color:var(--ink-faint);flex:0 0 8px;font-weight:700}.main-content{min-width:0;padding:32px clamp(20px,3.5vw,48px) 64px}.right-rail{border-left:1px solid var(--line);scrollbar-width:thin;width:220px;height:calc(100vh - 62px);padding:24px 16px 28px;position:sticky;top:62px;overflow-y:auto}.rail-header{border-bottom:1px solid var(--line);margin-bottom:14px;padding-bottom:10px}.rail-title{font:700 9.5px var(--mono);letter-spacing:.08em;color:var(--ink-faint);text-transform:uppercase;margin:0 0 6px}.rail-meta-row{font:10.5px var(--mono);justify-content:space-between;align-items:center;gap:8px;display:flex}.rail-meta-item{color:var(--ink-soft);align-items:center;gap:4px;display:inline-flex}.rail-reading-progress{color:var(--accent);letter-spacing:.02em;font-weight:600}.right-rail nav{border-left:1px solid var(--line-strong);gap:3px;padding-left:11px;display:grid}.toc-link{color:var(--ink-faint);padding:3px 0;font-size:11.5px;line-height:1.45;text-decoration:none;transition:color .15s}.toc-link:hover{color:var(--accent)}.toc-link.is-active{color:var(--accent);border-left:2px solid var(--accent);margin-left:-12px;padding-left:6px;font-weight:600}.toc-sub{padding-left:9px;font-size:10.75px}.rail-context-section{border-top:1px solid var(--line);margin-top:18px;padding-top:12px}.rail-context-title{font:700 9.5px var(--mono);letter-spacing:.08em;color:var(--ink-faint);text-transform:uppercase;margin:0 0 8px}.rail-context-links{flex-direction:column;gap:6px;display:flex}.rail-context-link{background:var(--paper-muted);border:1px solid var(--line);color:var(--ink-soft);border-radius:4px;padding:6px 8px;font-size:11px;line-height:1.4;text-decoration:none;transition:color .15s,border-color .15s,background .15s;display:block}.rail-context-link:hover{color:var(--accent);border-color:var(--accent);background:var(--accent-soft)}.rail-context-tags{flex-wrap:wrap;gap:5px;display:flex}.rail-system-pill{font:10px var(--mono);background:var(--paper-muted);border:1px solid var(--line);color:var(--ink-soft);border-radius:3px;padding:2px 6px;text-decoration:none;transition:border-color .15s,color .15s,background .15s}.rail-system-pill:hover{border-color:var(--accent);color:var(--accent);background:var(--accent-soft)}.rail-actions{border-top:1px dashed var(--line);flex-direction:column;gap:6px;margin-top:20px;padding-top:12px;display:flex}.rail-action-btn{font:10px var(--mono);color:var(--ink-faint);cursor:pointer;text-align:left;background:0 0;border:none;align-items:center;gap:6px;padding:3px 0;display:flex}.rail-action-btn:hover{color:var(--accent)}.rail-note{border-top:1px solid var(--line);color:var(--ink-faint);font:italic 12px var(--serif);margin-top:20px;padding-top:13px;line-height:1.5}.home-hero{border:1px solid var(--line);background-color:var(--paper-raised);background-image:radial-gradient(var(--dot-pattern) 1.25px, transparent 1.25px), linear-gradient(135deg, color-mix(in srgb, var(--accent-soft) 65%, transparent) 0%, transparent 60%);min-height:365px;box-shadow:var(--shadow-sm);background-position:-1px -1px,0 0;background-size:20px 20px,100% 100%;border-radius:12px;margin-bottom:12px;padding:52px 28px 46px;position:relative;overflow:hidden}.eyebrow{text-transform:uppercase;color:var(--accent);align-items:center;gap:10px;font-weight:700;display:inline-flex}.eyebrow-line{background:var(--accent);border-radius:2px;width:24px;height:2px}h1,h2,h3{font-family:var(--serif);letter-spacing:-.03em;font-weight:500}.home-hero h1{max-width:720px;color:var(--ink);margin:20px 0 18px;font-size:clamp(40px,5vw,66px);line-height:1.03}.home-hero h1 em{color:var(--accent);font-style:italic;font-weight:400}.hero-lede{max-width:610px;color:var(--ink-soft);margin:0;font-size:15.5px;line-height:1.76}.hero-actions{flex-wrap:wrap;align-items:center;gap:16px;margin-top:28px;display:flex}.button{cursor:pointer;border:1px solid #0000;border-radius:6px;justify-content:center;align-items:center;gap:9px;padding:10px 16px;font-size:12.5px;font-weight:600;transition:all .16s;display:inline-flex}.button-primary{background:var(--accent);color:#fff;border-color:var(--accent);box-shadow:0 2px 8px var(--accent-glow)}.button-primary:hover{background:var(--accent-strong);border-color:var(--accent-strong);transform:translateY(-1px)}.button-outline{background:var(--paper-raised);border-color:var(--line-strong);color:var(--ink)}.button-outline:hover{border-color:var(--accent);color:var(--accent);background:var(--accent-soft)}.button-quiet{border-color:var(--line);color:var(--ink-soft);background:0 0}.button-quiet:hover,.button-quiet[aria-pressed=true]{background:var(--accent-soft);color:var(--accent);border-color:var(--accent)}.button-small{padding:6px 10px;font-size:11px}.text-link{color:var(--accent);font-size:12.5px;font-weight:600;transition:color .15s}.text-link:hover{color:var(--accent-strong);text-underline-offset:3px;text-decoration:underline}.hero-stamp{border:1px solid var(--line-strong);border-top:2.5px solid var(--accent);background:color-mix(in srgb, var(--paper-raised) 90%, transparent);backdrop-filter:blur(8px);color:var(--ink-faint);font:600 9.5px 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