:root{--bg: #ffffff;--bg-soft: #f7f7f5;--text: #1f2330;--text-muted: #545a6b;--rule: #e3e4ea;--rule-strong: #c7c9d1;--accent: #3949ab;--accent-soft: #eef0fb;--max-w: 1100px;--max-w-prose: 720px;--radius: 6px;--shadow-card: 0 1px 2px rgba(20, 25, 40, .04), 0 4px 12px rgba(20, 25, 40, .04);--header-h: 56px;--font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;--font-mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;--fs-base: 17px;--lh-base: 1.65}@media(min-width:800px){:root{--fs-base: 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var(--accent));text-decoration:underline;text-decoration-thickness:1px;text-underline-offset:3px;text-decoration-color:color-mix(in srgb,var(--pillar-accent, var(--accent)) 35%,transparent);font-weight:500}.section-toc a:hover{text-decoration-thickness:2px;text-decoration-color:var(--pillar-accent, var(--accent))}.article-grid{display:grid;grid-template-columns:1fr}@media(min-width:1000px){.article-grid{grid-template-columns:minmax(0,1fr) 220px;column-gap:2.5rem;align-items:start}.article-grid>.article-sidebar{grid-column:2;grid-row:1 / span 99}.article-grid>:not(.article-sidebar){grid-column:1}}.article-sidebar{margin:.75rem 0 .5rem}.pillar-nav-title{margin:0 0 .4rem;font-size:.78rem;letter-spacing:.08em;text-transform:uppercase;color:var(--text-muted);font-weight:700}.pillar-nav ul{list-style:none;padding:0;margin:0;display:flex;flex-wrap:nowrap;gap:.4rem;overflow-x:auto;-webkit-overflow-scrolling:touch;padding-bottom:.25rem}.pillar-nav li{flex-shrink:0;margin:0}.pillar-nav a{display:inline-flex;align-items:center;gap:.4rem;padding:.4rem .75rem;background:var(--pillar-soft, var(--bg-soft));border-radius:999px;text-decoration:none;color:var(--text);font-size:.9rem;font-weight:500;white-space:nowrap;transition:background-color .15s,color .15s}.pillar-nav a:hover{background:var(--pillar-accent, var(--accent));color:#fff}.pillar-nav a:hover svg{color:#fff}.pillar-nav a svg{color:var(--pillar-accent, var(--accent));flex-shrink:0}@media(min-width:1000px){.article-sidebar{margin:0}.pillar-nav{position:sticky;top:calc(var(--header-h) + 1.25rem);padding:.9rem 1rem 1rem;background:var(--bg-soft);border-radius:var(--radius)}.pillar-nav ul{flex-direction:column;gap:.1rem;overflow:visible;padding-bottom:0}.pillar-nav a{display:flex;width:100%;padding:.5rem .65rem;border-radius:5px;background:transparent;font-size:.92rem}.pillar-nav a:hover{background:var(--bg);color:var(--pillar-accent, var(--accent))}.pillar-nav a:hover svg{color:var(--pillar-accent, 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