:root {
  color-scheme: light;
  --cp-bg: #f7f4ef;
  --cp-bg-elevated: #fcfbf8;
  --cp-surface: #ffffff;
  --cp-surface-soft: #f5f5f5;
  --cp-border: #dedede;
  --cp-border-strong: #919191;
  --cp-text: #242424;
  --cp-text-muted: #5c5c5c;
  --cp-text-soft: #6f6f6f;
  --cp-accent: #b11f4b;
  --cp-accent-hover: #9a1a41;
  --cp-accent-soft: rgba(177, 31, 75, 0.08);
  --cp-accent-fg: #ffffff;
  --cp-success: #16a34a;
  --cp-danger: #dc2626;
  --cp-warning: #f59e0b;
  --cp-link: #0078d4;
  --cp-shadow: 0 18px 48px rgba(0, 0, 0, 0.12);
  --cp-overlay: rgba(255, 255, 255, 0.8);
  --cp-panel: rgba(255, 255, 255, 0.86);
  --cp-panel-strong: rgba(255, 255, 255, 0.96);
  --cp-sheen: rgba(255, 255, 255, 0.55);
  --cp-highlight: rgba(177, 31, 75, 0.12);
}
html[data-theme="dark"] {
  color-scheme: dark;
  --cp-bg: #3d3b3a;
  --cp-bg-elevated: #343231;
  --cp-surface: #292929;
  --cp-surface-soft: #2e2e2e;
  --cp-border: #474747;
  --cp-border-strong: #5f5f5f;
  --cp-text: #dedede;
  --cp-text-muted: #919191;
  --cp-text-soft: #b0b0b0;
  --cp-accent: #fd8ea1;
  --cp-accent-hover: #fb7b91;
  --cp-accent-soft: rgba(253, 142, 161, 0.14);
  --cp-accent-fg: #1a1a1a;
  --cp-success: #4ade80;
  --cp-danger: #f87171;
  --cp-warning: #fbbf24;
  --cp-link: #4da6ff;
  --cp-shadow: 0 18px 48px rgba(0, 0, 0, 0.32);
  --cp-overlay: rgba(41, 41, 41, 0.88);
  --cp-panel: rgba(41, 41, 41, 0.72);
  --cp-panel-strong: rgba(41, 41, 41, 0.96);
  --cp-sheen: rgba(255, 255, 255, 0.04);
  --cp-highlight: rgba(253, 142, 161, 0.12);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 96px; }
body { margin: 0; background: var(--cp-bg); color: var(--cp-text); font: 16px/1.65 "Segoe UI", Aptos, Calibri, -apple-system, BlinkMacSystemFont, sans-serif; }
a { color: var(--cp-link); text-underline-offset: 4px; overflow-wrap: anywhere; }
a:hover { color: var(--cp-accent); }
button, input { font: inherit; }
button { cursor: pointer; }
:focus-visible { outline: 3px solid var(--cp-accent); outline-offset: 4px; }
button, input { border-radius: 0.625rem; border: 1px solid var(--cp-border); background: var(--cp-surface); color: var(--cp-text); }
button { padding: 8px 16px; }
button:hover { border-color: var(--cp-accent); }
.skip { position: fixed; top: -80px; left: 16px; z-index: 10; padding: 12px 20px; background: var(--cp-surface); }
.skip:focus { top: 12px; }
.site-header { min-height: 88px; padding: 16px max(24px, calc((100vw - 1280px) / 2)); display: flex; align-items: center; justify-content: space-between; gap: 24px; background: var(--cp-bg-elevated); border-bottom: 1px solid var(--cp-border); }
.brand { display: flex; gap: 12px; align-items: center; text-decoration: none; color: var(--cp-text); font-weight: 650; font-size: 20px; line-height: 1.3; }
.brand-mark { display: grid; place-items: center; width: 44px; height: 44px; border-radius: 0.625rem; background: var(--cp-accent); color: var(--cp-accent-fg); font-size: 16px; letter-spacing: -1px; }
.brand-subtitle { display: block; font-size: 10px; letter-spacing: 2px; color: var(--cp-text-muted); margin-top: 3px; }
.site-header nav { display: flex; gap: 24px; align-items: center; font-size: 14px; }
.site-header nav a { color: var(--cp-text); text-decoration: none; }
.home { max-width: 1280px; margin: 0 auto; padding: 0 24px; }
.hero { display: grid; grid-template-columns: minmax(0, 1fr) 280px; gap: 64px; align-items: center; padding: 80px 0 64px; }
.eyebrow { display: block; color: var(--cp-accent); letter-spacing: 1.7px; font-size: 11px; font-weight: 700; text-transform: uppercase; margin: 0 0 16px; }
h1, h2, h3 { line-height: 1.18; letter-spacing: -0.035em; }
.hero h1 { font-size: clamp(40px, 5vw, 66px); margin: 0 0 24px; font-weight: 650; }
.lead { font-size: 19px; color: var(--cp-text-muted); line-height: 1.65; max-width: 780px; }
.hero .lead { max-width: 650px; }
.hero-stats { display: grid; grid-template-columns: 1fr 1fr; border-left: 1px solid var(--cp-border-strong); padding-left: 32px; gap: 24px 16px; }
.hero-stats strong { display: block; font-size: 48px; font-weight: 350; letter-spacing: -3px; line-height: 1.2; }
.hero-stats span { color: var(--cp-text-muted); font-size: 13px; }
.hero-stats p { grid-column: 1 / -1; color: var(--cp-text-soft); font-size: 13px; margin: 0; line-height: 1.9; }
.editorial-note { font-size: 13px; line-height: 1.8; color: var(--cp-text-muted); padding: 16px 20px; background: var(--cp-accent-soft); border-left: 3px solid var(--cp-accent); border-radius: 0 0.625rem 0.625rem 0; }
.editorial-note strong { color: var(--cp-text); }
.section-heading { display: flex; align-items: end; justify-content: space-between; gap: 24px; margin: 64px 0 24px; }
.section-heading h2 { margin: 0; font-size: 30px; font-weight: 600; }
.section-heading .eyebrow { margin-bottom: 8px; }
#result-count { color: var(--cp-text-soft); font-size: 13px; white-space: nowrap; }
.search-controls { display: flex; gap: 24px; flex-wrap: wrap; align-items: end; justify-content: space-between; margin-bottom: 32px; }
.search-controls label { display: block; flex: 1 1 320px; max-width: 520px; font-size: 12px; font-weight: 600; color: var(--cp-text-muted); }
input[type="search"] { display: block; width: 100%; padding: 12px 16px; margin-top: 8px; font-size: 14px; }
.filters { display: flex; flex-wrap: wrap; gap: 8px; }
.filter { font-size: 13px; padding: 10px 16px; }
.filter.active { background: var(--cp-accent); color: var(--cp-accent-fg); border-color: var(--cp-accent); }
.topic-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px; }
.topic-card { display: flex; flex-direction: column; padding: 28px; border: 1px solid var(--cp-border); border-radius: 16px; background: var(--cp-surface); transition: border-color 140ms ease, transform 140ms ease; min-width: 0; }
.topic-card:hover { border-color: var(--cp-accent); transform: translateY(-2px); }
.topic-card .eyebrow { margin-bottom: 20px; font-size: 10px; }
.topic-card h2 { margin: 0 0 12px; font-size: 22px; font-weight: 600; line-height: 1.35; }
.topic-card h2 a { color: var(--cp-text); text-decoration: none; overflow-wrap: normal; }
.topic-card h2 a:hover { color: var(--cp-accent); }
.topic-card p { margin: 0 0 28px; color: var(--cp-text-muted); font-size: 14px; line-height: 1.7; }
.card-bottom { display: flex; gap: 12px; justify-content: space-between; align-items: center; margin-top: auto; padding-top: 16px; border-top: 1px solid var(--cp-border); font-size: 11px; }
.card-bottom span { color: var(--cp-text-soft); }
.card-bottom a { text-decoration: none; color: var(--cp-accent); font-weight: 600; white-space: nowrap; }
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 64px; margin: 72px 0; padding-top: 32px; border-top: 1px solid var(--cp-border); }
.about-grid h2 { font-size: 20px; font-weight: 600; }
.about-grid p { font-size: 14px; color: var(--cp-text-muted); max-width: 500px; }
footer { border-top: 1px solid var(--cp-border); display: flex; flex-wrap: wrap; justify-content: space-between; gap: 16px; padding: 28px max(24px, calc((100vw - 1280px) / 2)); font-size: 11px; color: var(--cp-text-soft); }
.topic-layout { display: grid; grid-template-columns: 248px minmax(0, 900px); gap: 64px; max-width: 1280px; margin: 0 auto; padding: 56px 24px 80px; align-items: start; }
.toc { position: sticky; top: 24px; max-height: calc(100vh - 48px); overflow-y: auto; font-size: 12px; padding-right: 16px; }
.toc summary { font-size: 13px; font-weight: 650; cursor: pointer; }
.toc ol { list-style: none; padding: 0; margin: 16px 0 24px; border-left: 1px solid var(--cp-border); }
.toc li { padding: 6px 0 6px 16px; line-height: 1.6; }
.toc a { color: var(--cp-text-muted); text-decoration: none; }
.toc a:hover { color: var(--cp-accent); }
.back-link { display: block; padding-top: 16px; border-top: 1px solid var(--cp-border); }
.article { min-width: 0; }
.article-header h1 { font-size: clamp(32px, 4vw, 48px); font-weight: 600; line-height: 1.2; margin: 0 0 24px; }
.article-header .lead { font-size: 18px; }
.article-meta { display: flex; flex-wrap: wrap; gap: 12px 24px; color: var(--cp-text-soft); font-size: 11px; margin: 24px 0 32px; }
.article-body { margin-top: 48px; overflow-wrap: anywhere; }
.article-body h2 { margin: 48px 0 24px; padding-top: 24px; border-top: 1px solid var(--cp-border); font-size: 28px; font-weight: 600; }
.article-body h3 { font-size: 21px; line-height: 1.35; margin: 32px 0 16px; }
.article-body h4 { font-size: 17px; margin-top: 24px; }
.article-body p, .article-body li { line-height: 1.8; font-size: 15px; }
.article-body li { margin-bottom: 8px; }
.article-body blockquote { margin: 24px 0; padding: 16px 20px; background: var(--cp-accent-soft); border-left: 3px solid var(--cp-accent); color: var(--cp-text-muted); font-size: 14px; }
.article-body table { display: block; max-width: 100%; overflow-x: auto; border-collapse: collapse; margin: 24px 0; font-size: 13px; }
th, td { border: 1px solid var(--cp-border); text-align: left; padding: 12px 16px; vertical-align: top; min-width: 100px; }
th { background: var(--cp-surface-soft); font-weight: 600; }
td { background: var(--cp-surface); }
code, pre { font-family: Consolas, "Courier New", Courier, monospace; }
:not(pre) > code { background: var(--cp-surface-soft); border: 1px solid var(--cp-border); padding: 1px 4px; border-radius: 4px; font-size: 0.86em; }
pre { padding: 24px; margin: 24px 0; border: 1px solid var(--cp-border); border-radius: 0.625rem; background: var(--cp-surface); color: var(--cp-text); overflow-x: auto; font-size: 12px; line-height: 1.85; tab-size: 2; }
.code-toolbar { display: flex; justify-content: flex-end; margin: 20px 0 -16px; }
.copy-code { font-size: 11px; padding: 4px 12px; }
.download-list { padding: 0; list-style: none; }
.download-list li { padding: 16px 20px; border: 1px solid var(--cp-border); border-radius: 0.625rem; background: var(--cp-surface); }
.download-list p { margin: 4px 0 0; color: var(--cp-text-muted); font-size: 13px; }
.download-list a { font-weight: 600; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }
[hidden] { display: none !important; }
.topic-illustration { margin: -28px -28px 24px; padding: 4px 8px; border-bottom: 1px solid var(--cp-border); border-radius: 16px 16px 0 0; background: var(--cp-bg-elevated); overflow: hidden; }
.topic-illustration svg { display: block; width: 100%; height: auto; }
.topic-illustration .diagram-kicker, .topic-illustration .diagram-edge-label, .topic-illustration .diagram-node-detail { display: none; }
.topic-illustration .diagram-node-title { display: none; }
.topic-illustration .diagram-node > g { transform: translate(66px, 22px) scale(1.2); }
.technical-visual { margin: 36px 0; background: var(--cp-bg-elevated); border: 1px solid var(--cp-border); border-radius: 16px; overflow: hidden; }
.visual-heading { padding: 24px 24px 0; }
.visual-heading .eyebrow { margin-bottom: 12px; }
.visual-heading h2, .visual-heading h3 { margin: 0; padding: 0; border: 0; font-size: 23px; line-height: 1.35; }
.visual-heading p { margin: 8px 0 0; color: var(--cp-text-muted); font-size: 12px; }
.visual-canvas { overflow-x: auto; padding: 8px 12px; }
.visual-canvas svg { display: block; width: 100%; min-width: 620px; height: auto; }
.technical-visual figcaption { border-top: 1px solid var(--cp-border); margin: 0; padding: 16px 24px; color: var(--cp-text-muted); font-size: 12px; line-height: 1.8; background: var(--cp-surface); }
.diagram-node rect { fill: var(--cp-surface); stroke: var(--cp-border-strong); stroke-width: 1; }
.diagram-accent rect { fill: var(--cp-accent-soft); stroke: var(--cp-accent); stroke-width: 1.5; }
.diagram-icon { fill: none; stroke: var(--cp-accent); stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.diagram-node-title { fill: var(--cp-text); font-size: 13px; font-weight: 650; }
.diagram-node-detail { fill: var(--cp-text-muted); font-size: 10px; }
.diagram-edge { fill: none; stroke: var(--cp-accent); stroke-width: 1.5; stroke-linejoin: round; }
.diagram-arrow { fill: var(--cp-accent); }
.diagram-dashed { stroke-dasharray: 5 5; stroke: var(--cp-text-soft); }
.diagram-edge-label { fill: var(--cp-text-muted); font-size: 10px; text-anchor: middle; }
.diagram-guide, .chart-grid { fill: none; stroke: var(--cp-border); stroke-width: 1; }
.diagram-kicker { fill: var(--cp-text-soft); font-size: 9px; letter-spacing: 1.6px; }
.chart-tick { fill: var(--cp-text-soft); font-size: 11px; text-anchor: middle; }
.chart-label { fill: var(--cp-text); font-size: 13px; text-anchor: end; }
.chart-value { fill: var(--cp-text); font-size: 13px; font-weight: 650; }
.chart-bar { fill: var(--cp-accent); }
@media (max-width: 1060px) {
  .topic-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .topic-layout { grid-template-columns: 200px minmax(0, 1fr); gap: 32px; }
  .hero { gap: 32px; grid-template-columns: minmax(0, 1fr) 220px; }
}
@media (max-width: 720px) {
  .site-header { padding: 16px 20px; gap: 12px; }
  .site-header nav { gap: 12px; font-size: 12px; }
  .site-header nav button { padding: 8px; font-size: 11px; }
  .brand { font-size: 17px; gap: 8px; }
  .brand-mark { width: 36px; height: 36px; }
  .hero { display: block; padding: 48px 0 32px; }
  .hero-stats { margin-top: 32px; padding-left: 20px; grid-template-columns: 80px 80px 1fr; }
  .hero-stats p { grid-column: auto; font-size: 11px; }
  .hero-stats strong { font-size: 36px; }
  .hero-stats span { font-size: 11px; }
  .home { padding: 0 20px; }
  .section-heading { margin-top: 40px; }
  .section-heading h2 { font-size: 25px; }
  .topic-grid, .about-grid { grid-template-columns: 1fr; }
  .topic-card { padding: 24px; }
  .topic-illustration { margin: -24px -24px 24px; }
  .visual-heading { padding: 20px 20px 0; }
  .visual-heading h2, .visual-heading h3 { font-size: 21px; }
  .technical-visual figcaption { padding: 16px 20px; }
  .about-grid { gap: 20px; margin: 48px 0; }
  .topic-layout { display: block; padding: 24px 20px 48px; }
  .toc { position: static; max-height: none; padding: 16px; border: 1px solid var(--cp-border); border-radius: 0.625rem; margin-bottom: 32px; }
  .article-body h2 { font-size: 25px; }
  .lead { font-size: 17px; }
  pre { padding: 16px; }
  footer { padding: 24px 20px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .topic-card { transition: none; }
  .topic-card:hover { transform: none; }
}