*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:2rem}body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--body);font-size:17px;line-height:1.75}body.ledger{--paper:#f4f0e5;--ink:#24231f;--muted:#625c50;--accent:#a3341f;--line:#c9c0ad;--panel:#ebe3d2;--heading:Georgia,'PMingLiU',serif;--body:Cambria,'Microsoft JhengHei',serif;--measure:1180px}body.map{--paper:#131f25;--ink:#edf3ed;--muted:#b2c2c5;--accent:#a5e8c6;--line:#43575c;--panel:#20343a;--heading:'Trebuchet MS','Microsoft JhengHei',sans-serif;--body:'Segoe UI','Microsoft JhengHei',sans-serif;--measure:1200px}body.geometry{--paper:#fafbf9;--ink:#182c35;--muted:#4c6068;--accent:#994011;--line:#b5c6cc;--panel:#e8eef0;--heading:'Bahnschrift','Microsoft JhengHei',sans-serif;--body:'Trebuchet MS','Microsoft JhengHei',sans-serif;--measure:1260px}body.notes{--paper:#f3f5ec;--ink:#243c2b;--muted:#566858;--accent:#385c3e;--line:#bac8b4;--panel:#e4eadb;--heading:Georgia,'PMingLiU',serif;--body:Cambria,'Microsoft JhengHei',serif;--measure:1060px}a{color:inherit;text-decoration-thickness:1px;text-underline-offset:.22em}a:hover{color:var(--accent)}a:focus-visible,button:focus-visible{outline:3px solid var(--accent);outline-offset:5px}.page-shell{max-width:var(--measure);margin:auto;padding:0 42px}.masthead{display:flex;align-items:center;justify-content:space-between;gap:24px;border-bottom:1px solid var(--line);padding:29px 0}.brand{font-family:var(--heading);font-size:1.05rem;font-weight:700;text-decoration:none;display:flex;gap:12px;align-items:center}.brand-mark{display:inline-grid;place-content:center;min-width:32px;height:32px;background:var(--ink);color:var(--paper);font-family:Consolas,monospace;font-size:12px}.masthead nav{display:flex;gap:22px;flex-wrap:wrap;font-size:.82rem}.masthead nav a{text-decoration:none}.intro{padding:82px 0 64px;max-width:880px}.eyebrow{font-family:Consolas,'Microsoft JhengHei',monospace;text-transform:uppercase;letter-spacing:.13em;color:var(--accent);font-size:.72rem;font-weight:700;margin:0 0 20px}h1,h2,h3{font-family:var(--heading);line-height:1.16;letter-spacing:-.025em}h1{font-size:clamp(2.4rem,5.4vw,5.2rem);font-weight:400;margin:0 0 28px;max-width:1020px;text-wrap:balance}h2{font-size:1.8rem;margin:2.8rem 0 1rem}h3{font-size:1.2rem;margin-top:2.2rem}.lede{font-size:1.2rem;line-height:1.75;max-width:760px;color:var(--muted)}.button{display:inline-block;border:1px solid var(--ink);padding:10px 20px;margin-top:20px;text-decoration:none;font-family:var(--body);font-size:.85rem}.button:hover{background:var(--ink);color:var(--paper)}.article-list{list-style:none;margin:0;padding:0;border-top:2px solid var(--ink)}.article-list li{display:grid;grid-template-columns:60px 1fr 30px;gap:20px;padding:32px 0;border-bottom:1px solid var(--line)}.article-no{font:14px Consolas,monospace;padding-top:4px;color:var(--muted)}.article-list h2{font-size:1.9rem;margin:0 0 12px;max-width:850px}.article-list h2 a{text-decoration:none}.article-list .eyebrow{margin-bottom:10px}.article-list p{max-width:800px;margin:0;color:var(--muted)}.arrow{font-size:1.5rem;color:var(--accent)}.resource-box{padding:28px 32px;background:var(--panel);margin:48px 0 80px;border-left:4px solid var(--accent)}.resource-box h2{font-size:1.25rem;margin:0 0 16px}.resource-box ul{padding-left:20px}.resource-box p{color:var(--muted);font-size:.9rem;max-width:860px}.article-content{max-width:820px;margin:0 auto;padding-bottom:70px}.article-header{padding:65px 0 30px;border-bottom:1px solid var(--line);margin-bottom:38px}.article-header h1{font-size:clamp(2.1rem,4.2vw,3.7rem)}.article-content p,.article-content li{overflow-wrap:anywhere}.article-content code{font-family:Consolas,'Cascadia Mono',monospace;font-size:.86em;background:var(--panel);padding:.1em .3em}.article-content pre{padding:22px 24px;background:var(--panel);border:1px solid var(--line);overflow:auto;line-height:1.65;font-size:.85rem;white-space:pre}.article-content pre code{background:none;padding:0;font-size:inherit}.article-content blockquote{border-left:3px solid var(--accent);margin:28px 0;padding:5px 0 5px 24px;color:var(--muted)}.article-content table{width:100%;border-collapse:collapse;font-size:.9rem;margin:25px 0;display:block;overflow:auto}.article-content th,.article-content td{padding:12px 16px;border:1px solid var(--line);text-align:left}.article-content th{background:var(--panel)}footer{display:flex;gap:20px;align-items:center;flex-wrap:wrap;border-top:1px solid var(--line);padding:25px 0 40px;font-size:.75rem;color:var(--muted)}footer p{margin:0;flex:1;min-width:220px}.skip{position:absolute;left:20px;top:-100px;background:var(--paper);padding:10px;z-index:2}.skip:focus{top:10px}.map .intro{border-left:1px solid var(--accent);padding-left:36px;margin-top:44px;padding-top:30px}.map .article-list li{grid-template-columns:70px 1fr 30px}.map h1{font-weight:700;letter-spacing:-.055em}.geometry .masthead{border-bottom:4px solid var(--ink)}.geometry .brand-mark{background:var(--accent);color:#fff}.geometry .intro{max-width:100%;display:grid;grid-template-columns:1.5fr 1fr;gap:0 50px}.geometry .intro .eyebrow{grid-column:1/-1}.geometry .intro h1{grid-row:2/4;font-weight:650;letter-spacing:-.05em}.geometry .intro .button{justify-self:start;align-self:start}.geometry .article-list{border-top:1px solid var(--ink)}.geometry .article-list li{border-left:1px solid var(--line);padding-left:24px}.notes .intro{max-width:760px;margin:0 auto;text-align:center;padding:90px 0 70px}.notes .intro .lede{margin-left:auto;margin-right:auto}.notes .brand-mark{border-radius:50%;background:var(--accent)}.notes .article-list li{grid-template-columns:45px 1fr 25px}.notes .article-no{font-family:Georgia,serif;font-style:italic;font-size:1.4rem}.notes .article-list h2{font-weight:400;font-size:2.1rem}.ledger .intro h1{font-style:italic}.ledger .masthead{border-top:5px solid var(--accent)}.ledger .article-no{border-top:2px solid var(--accent);width:34px;padding-top:10px}.ledger .article-list li{gap:30px}@media(max-width:720px){.page-shell{padding:0 22px}.masthead{align-items:flex-start;flex-direction:column;gap:18px}.masthead nav{gap:20px}.intro,.notes .intro{padding:50px 0 45px}.article-list li,.map .article-list li,.notes .article-list li{grid-template-columns:28px 1fr;gap:16px}.arrow{display:none}.article-list h2,.notes .article-list h2{font-size:1.55rem}.geometry .intro{display:block}.geometry .article-list li{padding-left:12px}.map .intro{padding-left:20px}.article-header{padding-top:45px}.resource-box{padding:22px}.article-content pre{padding:16px}.lede{font-size:1.05rem}h2{font-size:1.55rem}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}

/* Article context, attribution and local reading paths. */
.workflow-note{max-width:760px;color:var(--muted);font-size:.96rem;border-left:2px solid var(--accent);padding-left:18px;margin:22px 0 0}.breadcrumbs{font-size:.76rem;color:var(--muted);margin-top:30px}.breadcrumbs ol{list-style:none;padding:0;margin:0;display:flex;flex-wrap:wrap;gap:6px 12px}.breadcrumbs li+li:before{content:"/";margin-right:12px;color:var(--accent)}.breadcrumbs [aria-current]{overflow-wrap:anywhere}.breadcrumbs+.article-header,.breadcrumbs+article .article-header{padding-top:25px}.byline{display:flex;flex-wrap:wrap;gap:6px 20px;font-size:.78rem;color:var(--muted);margin-top:25px}.byline time{font-variant-numeric:tabular-nums}.related-reading{border-top:1px solid var(--line);margin-top:48px;padding-top:20px}.related-reading h2{font-size:1.1rem;margin:0 0 12px}.related-reading ul{padding-left:20px;margin:0}.related-reading a{font-size:.95rem}
