:root{--bg:#fff;--bg-2:#fff;--surface:#fff;--surface-2:#f7f7f5;--surface-3:#f0f0ed;--ink:#141414;--ink-soft:#333;--muted:#666;--muted-2:#8a8a8a;--border:#e4e4e0;--border-strong:#d4d4cf;--border-brand:#0a6b3f;--brand:#0a6b3f;--brand-dim:#085a35;--brand-deep:#085a35;--brand-soft:#eef5f0;--brand-glow:transparent;--gold:#0a6b3f;--gold-soft:#eef5f0;--up:#0a6b3f;--down:#b3261e;--header-bg:#fff;--footer-bg:#fff;--on-brand:#fff;--on-gold:#fff;--brand-hi:#085a35;--selection-fg:#fff;--rw-bg:#fdf6f5;--rw-border:#e5c5c1;--rw-text:#6b2b26;--rw-strong:#6b2b26;--radius:6px;--radius-sm:6px;--radius-xs:4px;--shadow-sm:none;--shadow-md:none;--shadow-lg:none;--glow-brand:none;--container:960px;--reading:680px;--font-display:-apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;--font-sans:-apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;--font-mono:ui-monospace, SFMono-Regular, Menlo, Consolas, monospace}[data-theme=dark]{--bg:#0e0e0e;--bg-2:#0e0e0e;--surface:#0e0e0e;--surface-2:#161616;--surface-3:#1e1e1e;--ink:#ececec;--ink-soft:#cfcfcf;--muted:#a3a3a3;--muted-2:#7d7d7d;--border:#262626;--border-strong:#3a3a3a;--border-brand:#4ade80;--brand:#4ade80;--brand-dim:#4ade80;--brand-deep:#4ade80;--brand-soft:#14231a;--brand-glow:transparent;--gold:#4ade80;--gold-soft:#14231a;--up:#4ade80;--down:#f08080;--header-bg:#0e0e0e;--footer-bg:#0e0e0e;--on-brand:#0e0e0e;--on-gold:#0e0e0e;--brand-hi:#4ade80;--selection-fg:#0e0e0e;--rw-bg:transparent;--rw-border:#5a3a37;--rw-text:#e0b3ae;--rw-strong:#e0b3ae}*{box-sizing:border-box;margin:0;padding:0}body{font-family:var(--font-sans);color:var(--ink-soft);background:var(--bg);-webkit-font-smoothing:antialiased;line-height:1.7}::selection{background:var(--brand);color:var(--selection-fg)}.container{max-width:var(--container);margin:0 auto;padding:0 20px}.site-header{border-bottom:1px solid var(--border);background:var(--header-bg)}.nav-inner{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:16px;min-height:56px;padding-top:10px;padding-bottom:10px;display:flex}.brand{color:var(--ink);letter-spacing:-.01em;font-size:1.05rem;font-weight:700;text-decoration:none}.brand .mark{display:none}.brand span{color:inherit;font-weight:700}.nav-links{flex-wrap:wrap;align-items:center;gap:16px;display:flex}.nav-links>a:not(.btn){color:var(--muted);font-size:.9rem;text-decoration:none}.nav-links>a:not(.btn):hover,.nav-links>a.active{color:var(--ink);text-decoration:underline}.nav-search{color:var(--muted);display:inline-flex}.nav-search:hover{color:var(--ink)}.nav-search svg{width:18px;height:18px;display:block}.nav-search-mobile{display:none}.nav-toggle{border:1px solid var(--border);border-radius:var(--radius-xs);color:var(--ink);cursor:pointer;background:0 0;padding:6px 8px;display:none}.nav-toggle svg{width:20px;height:20px;display:block}.nav-backdrop,.theme-toggle.theme-toggle-mobile{display:none}.theme-toggle{border:1px solid var(--border);border-radius:var(--radius-xs);color:var(--muted);cursor:pointer;background:0 0;justify-content:center;align-items:center;padding:6px;display:inline-flex}.theme-toggle:hover{color:var(--ink);border-color:var(--border-strong)}.theme-toggle svg{width:16px;height:16px;display:block}.theme-toggle .ic-sun{display:none}[data-theme=dark] .theme-toggle .ic-sun{display:block}[data-theme=dark] .theme-toggle .ic-moon{display:none}.btn{border-radius:var(--radius-sm);cursor:pointer;border:1px solid var(--ink);background:var(--ink);color:var(--bg);padding:9px 16px;font-size:.92rem;font-weight:600;text-decoration:none;display:inline-block}.btn:hover{opacity:.85}.btn-primary,.btn-gold{background:var(--ink);color:var(--bg);border-color:var(--ink)}.btn-ghost{color:var(--ink);border-color:var(--border-strong);background:0 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0;padding:12px}main>article figure.chart-figure svg{width:100%;height:auto;display:block}main>article figure.chart-figure figcaption{color:var(--muted);margin-top:8px;font-size:.88rem}main>article figure.chart-figure .demo-note{color:var(--muted);margin:6px 0 0;font-size:.8rem;font-style:italic}main>article blockquote{border-left:2px solid var(--ink);color:var(--ink);margin:1.2rem 0;padding:.5rem 1rem}main>article code{background:var(--surface-2);border:1px solid var(--border);font-size:.86em;font-family:var(--font-mono);border-radius:4px;padding:.1em .4em}main>article pre{background:var(--surface-2);border:1px solid var(--border);border-radius:var(--radius-sm);margin:1.2rem 0;padding:14px;overflow-x:auto}main>article pre code{background:0 0;border:none;padding:0}main>article table{border-collapse:collapse;width:100%;margin:1.2rem 0;font-size:.94rem}main>article th,main>article td{border-bottom:1px solid var(--border);text-align:left;padding:10px 12px}main>article th{color:var(--ink);font-weight:600}.tag{color:var(--muted);font-family:var(--font-mono);letter-spacing:.04em;text-transform:uppercase;margin:0 8px 4px 0;font-size:11px;text-decoration:none;display:inline-block}a.tag:hover{color:var(--ink);text-decoration:underline}.section-head{margin-bottom:16px}.eyebrow{font-family:var(--font-mono);letter-spacing:.1em;text-transform:uppercase;color:var(--muted);margin-bottom:6px;font-size:.72rem;display:block}.section-head h2{letter-spacing:-.01em;color:var(--ink);font-size:1.4rem}.section-sub{color:var(--muted);margin-top:4px;font-size:.95rem}.block{margin-bottom:48px}.site-footer{border-top:1px solid var(--border);background:var(--footer-bg);color:var(--muted);margin-top:32px;padding:32px 0;font-size:.88rem}.footer-inner{flex-wrap:wrap;justify-content:space-between;gap:48px;display:flex}.footer-brand{flex:200px}.footer-brand .brand{font-size:1rem}.footer-brand p{margin-top:8px;font-size:.88rem}.footer-cols{flex-wrap:wrap;flex:2 auto;justify-content:space-between;gap:48px;display:flex}.footer-cols h4{letter-spacing:.08em;text-transform:uppercase;color:var(--ink);margin-bottom:8px;font-size:.75rem}.footer-cols a{color:var(--muted);margin-bottom:6px;font-size:.88rem;text-decoration:none;display:block}.footer-cols a:hover{color:var(--ink);text-decoration:underline}.footer-disclaimer{border-top:1px solid var(--border);margin-top:24px;padding-top:16px;font-size:12px;line-height:1.7}@media (width<=640px){.footer-inner{flex-direction:column;gap:24px}.footer-cols{justify-content:flex-start;gap:24px}}.page-head{margin-bottom:24px}.page-title{letter-spacing:-.02em;color:var(--ink);margin-bottom:6px;font-size:1.9rem}.page-lead{color:var(--muted);margin-bottom:8px}.lst{grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;display:grid}@media (width<=640px){.lst{grid-template-columns:1fr}}.lst-card{color:inherit;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:20px;text-decoration:none;display:block}.lst-card:hover{border-color:var(--border-strong)}.lst-card h2,.lst-card h3{color:var(--ink);margin-bottom:4px;font-size:1.1rem}.lst-card:hover h2,.lst-card:hover h3{text-decoration:underline}.lst-card p{color:var(--muted);margin:0;font-size:.94rem}.post-cover{border:1px solid var(--border);width:100%;height:auto;margin:20px 0;display:block}.post-date{color:var(--muted);font-size:13px;font-family:var(--font-mono);margin-top:8px!important}.post-meta{flex-wrap:wrap;align-items:center;gap:8px;margin:10px 0 18px;display:flex}.post-meta .post-date{margin:0!important}.post-meta a{color:var(--muted)}.pager{flex-wrap:wrap;align-items:center;gap:16px;margin-top:32px;display:flex}.pager a{color:var(--ink);text-underline-offset:3px;text-decoration:underline}.pager span{color:var(--muted);font-family:var(--font-mono);font-size:14px}.cat-list{border-top:1px solid var(--border);gap:0;padding:0;list-style:none;display:grid}.cat-list li{border-bottom:1px solid var(--border);background:0 0;border-radius:0;padding:12px 0}.cat-list a{color:var(--ink);font-size:1.05rem;text-decoration:none}.cat-list a:hover{text-decoration:underline}.cat-list .count{color:var(--muted);font-family:var(--font-mono);margin-left:8px;font-size:.85rem}.linklist{border-top:1px solid var(--border);gap:0;padding:0;list-style:none;display:grid}.linklist li{border-bottom:1px solid var(--border);background:0 0;border-radius:0;padding:12px 0}.linklist a{color:var(--ink)}.back{color:var(--muted);font-size:14px;font-family:var(--font-mono);text-decoration:none}.back:hover{color:var(--ink);text-decoration:underline}.search-ui{width:100%;margin-bottom:32px}.search-modal{z-index:100;justify-content:center;align-items:flex-start;padding:12vh 16px 16px;display:flex;position:fixed;inset:0}.search-modal[hidden]{display:none}.search-backdrop{background:#0006;position:absolute;inset:0}.search-box{background:var(--bg);border:1px solid var(--border-strong);border-radius:var(--radius-sm);width:min(560px,100%);position:relative;overflow:hidden}.search-field{border-bottom:1px solid var(--border);align-items:center;gap:10px;padding:12px 14px;display:flex}.search-field svg{width:18px;height:18px;color:var(--muted);flex:none}.search-field input{color:var(--ink);background:0 0;border:0;outline:none;flex:1;font-size:1rem}.search-field kbd{font-family:var(--font-mono);color:var(--muted);border:1px solid var(--border);border-radius:4px;padding:1px 6px;font-size:12px}.search-results{max-height:56vh;overflow-y:auto}.search-result{color:var(--ink);border-bottom:1px solid var(--border);padding:10px 14px;text-decoration:none;display:block}.search-result:hover{background:var(--surface-2)}.search-result-title{font-weight:600;display:block}.search-result-excerpt{color:var(--muted);margin-top:2px;font-size:.88rem;display:block}.search-empty{color:var(--muted);text-align:center;padding:14px}.school-list{border-top:1px solid var(--border);gap:0;display:grid}.school-level{border:none;border-bottom:1px solid var(--border);box-shadow:none;background:0 0;border-radius:0}.sl-summary{cursor:pointer;align-items:baseline;gap:12px;padding:14px 0;list-style:none;display:flex}.sl-summary::-webkit-details-marker{display:none}.sl-num{font-family:var(--font-mono);color:var(--muted);flex:none;font-size:.8rem}.sl-title{flex:auto;min-width:0}.sl-level{font-family:var(--font-mono);letter-spacing:.08em;text-transform:uppercase;color:var(--muted);font-size:.7rem}.sl-title h3{color:var(--ink);margin:0;font-size:1.05rem}.sl-toggle{display:none}.sl-body{border:none;padding:0 0 14px}.sl-blurb{color:var(--muted);margin:8px 0;font-size:.94rem}.sl-lessons{gap:6px;margin:0;padding:0;list-style:none;display:grid}.sl-lessons a{color:var(--ink)}.school-roadmap{gap:6px;margin:0 0 16px;padding:0;list-style:none;display:grid}.sr-step{color:var(--ink-soft);align-items:baseline;gap:10px;font-size:.92rem;display:flex}.sr-step:not(:last-child):after{display:none}.sr-num{font-family:var(--font-mono);color:var(--muted);font-size:.78rem}.sr-name{color:inherit}.school-more{margin-top:16px}.js .reveal{opacity:1;transform:none}@media (width<=600px){.nav-links{z-index:90;background:var(--bg);border-left:1px solid var(--border);flex-direction:column;align-items:stretch;gap:0;width:min(280px,82vw);padding:60px 24px 24px;transition:transform .25s;position:fixed;top:0;bottom:0;right:0;transform:translate(100%)}.nav-links.open{transform:none}.nav-links>a:not(.btn){border-bottom:1px solid var(--border);padding:12px 0;font-size:1rem}.nav-links .nav-search,.nav-links 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