@font-face { font-family: Archivo; src: url("../fonts/archivo-latin-variable.woff2") format("woff2"); font-style: normal; font-weight: 100 900; font-stretch: 75% 125%; font-display: swap; }
:root {
  color-scheme: light;
  --paper: #f2efe6; --white: #fcfaf4; --mineral: #e4e1d8; --graphite: #20231f;
  --ink: #20231f; --muted: #5c6258; --signal: #d9ed66; --signal-ink: #526017;
  --line: #c5c8b9; --dark-muted: #b6bfaa;
  --sans: Archivo, "Arial", sans-serif; --mono: Consolas, "Liberation Mono", monospace;
  --gutter: clamp(22px, 4.45vw, 80px); --max: 1664px;
  --space-s: clamp(20px, 2.2vw, 36px); --space-m: clamp(40px, 5vw, 80px); --space-l: clamp(76px, 8vw, 132px);
  --display: clamp(64px, 9.5vw, 154px); --chapter: clamp(46px, 6vw, 96px);
  --ease: cubic-bezier(.2,.7,.2,1); --duration: 180ms;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 32px; }
body { margin: 0; background: var(--paper); color: var(--ink); font-family: var(--sans); font-size: 17px; font-weight: 400; line-height: 1.65; -webkit-font-smoothing: antialiased; }
figure, h1, h2, h3, p, ol, ul { margin: 0; }
h1, h2, h3 { font-weight: 500; line-height: 1.06; letter-spacing: -.045em; }
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
a:focus-visible, summary:focus-visible { outline: 2px solid currentColor; outline-offset: 6px; }
::selection { background: var(--signal); color: var(--ink); }
.container { width: min(var(--max), calc(100% - var(--gutter)*2)); margin-inline: auto; }
.skip-link { position: absolute; z-index: 100; top: 12px; left: var(--gutter); padding: 10px 16px; background: var(--graphite); color: var(--paper); transform: translateY(-200%); }
.skip-link:focus { transform: translateY(0); }
.mono, .equation > p:first-child, .mathematical-line { font-family: var(--mono); }
.status { display: flex; align-items: center; gap: 9px; color: var(--muted); font-size: 14px; line-height: 1.5; }
.status::before { content: ""; width: 6px; height: 6px; background: var(--signal-ink); }
.text-link, .button { display: inline-flex; align-items: center; gap: 28px; min-height: 48px; padding-block: 8px; border-bottom: 1px solid currentColor; font-size: 17px; font-weight: 500; line-height: 1.5; }
.text-link svg, .button svg { width: 19px; height: 19px; flex-shrink: 0; transition: transform var(--duration) var(--ease); }
.text-link:hover svg, .button:hover svg { transform: translate(3px,-3px); }
.body-list { padding-left: 22px; }
.body-list li { padding-left: 8px; margin-block: 14px; }
p a, .body-list a { text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 4px; }
p a:hover, .body-list a:hover { text-decoration-thickness: 2px; }

/* The navigation is an index: restrained, native and fully crawlable. */
.site-header { position: relative; z-index: 20; }
.header-inner { position: relative; display: flex; align-items: center; justify-content: space-between; gap: 32px; min-height: 100px; }
.brand { display: inline-flex; align-items: center; gap: 14px; min-height: 44px; font-size: 22px; line-height: 1.2; font-weight: 520; letter-spacing: -.055em; white-space: nowrap; }
.brand img { width: 32px; height: 32px; flex-shrink: 0; }
.brand-light { font-weight: 410; }
.desktop-nav { display: flex; align-items: center; gap: 26px; }
.nav-link { display: flex; align-items: center; min-height: 44px; font-size: 15px; line-height: 1.5; }
.nav-link:hover, .nav-link.is-active { text-decoration: underline; text-underline-offset: 6px; }
.nav-cluster { display: flex; align-items: center; }
.nav-disclosure { position: relative; }
.nav-disclosure summary { display: grid; place-items: center; width: 34px; min-height: 44px; list-style: none; cursor: pointer; }
summary::-webkit-details-marker { display: none; }
.nav-disclosure[open] summary svg { transform: rotate(180deg); }
.dropdown { position: absolute; top: calc(100% + 12px); right: -16px; width: 276px; padding: 12px 18px; background: var(--white); box-shadow: 0 12px 30px #20231f14; }
.dropdown a { display: flex; align-items: center; min-height: 44px; font-size: 15px; padding-block: 8px; }
.dropdown a:first-child { color: var(--muted); margin-bottom: 6px; border-bottom: 1px solid var(--line); }
.dropdown a:hover { text-decoration: underline; text-underline-offset: 5px; }
.mobile-menu { display: none; }

/* A monumental typographic object, intersected by an ordered computational field. */
.editorial-hero { position: relative; min-height: min(850px, calc(100svh - 100px)); padding-top: clamp(54px,6vw,100px); padding-bottom: 60px; overflow: clip; isolation: isolate; }
.hero-title { position: relative; z-index: 2; font-size: var(--display); font-weight: 570; font-stretch: 78%; letter-spacing: -.052em; line-height: .94; text-transform: uppercase; }
.hero-title span { display: block; width: fit-content; }
.hero-field { position: absolute; z-index: -1; right: -115px; top: 290px; width: min(790px,58vw); }
.hero-field .diagram { margin: 0; }
.hero-field figcaption { max-width: 300px; margin-left: 200px; }
.hero-foot { display: grid; grid-template-columns: minmax(0,550px) 1fr; align-items: end; gap: 80px; margin-top: 44px; }
.hero-description { font-size: 19px; line-height: 1.65; max-width: 560px; }
.hero-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 40px; margin-top: 24px; }
.hero-actions .secondary-link { display: inline-flex; align-items: center; gap: 20px; min-height: 48px; font-size: 15px; color: var(--muted); }
.hero-note { position: absolute; left: 0; bottom: 24px; max-width: 550px; color: var(--muted); font-size: 13px; }
.diagram { margin-block: 32px; }
.diagram > svg { width: 100%; height: auto; overflow: visible; font-family: var(--sans); }
.diagram > .diagram-mobile { display: none; }
.diagram figcaption { font-size: 13px; color: var(--muted); line-height: 1.65; margin-top: 18px; max-width: 800px; }
.hero-field svg { overflow: hidden; }
.hero-field .field-peripheral { display: none; }
.state-trace { stroke-dasharray: 180 2000; animation: state-path 40s linear infinite; }
@keyframes state-path { to { stroke-dashoffset: -2180; } }

/* Vary the narrative scale: statement, system chapters, index, engineering essay. */
.editorial-statement { padding-block: var(--space-l); border-top: 1px solid var(--line); }
.editorial-statement h2 { max-width: 1040px; font-size: clamp(36px,4.3vw,66px); margin-bottom: 46px; }
.statement-columns { display: grid; grid-template-columns: 1.05fr 1fr; gap: 10%; }
.statement-columns > p { font-size: 23px; line-height: 1.6; }
.statement-secondary p { font-size: 17px; line-height: 1.75; color: var(--muted); }
.statement-secondary p + p { margin-top: 22px; }
.portfolio-preface { padding-block: 10px 48px; display: grid; grid-template-columns: 1fr 1fr; gap: 10%; }
.portfolio-preface h2 { max-width: 620px; font-size: 30px; line-height: 1.3; }
.portfolio-preface p { font-size: 16px; color: var(--muted); max-width: 640px; }
.home-chapter { padding-block: var(--space-l); }
.chapter-qnet { padding-top: 44px; padding-bottom: 100px; }
.qnet-composition { display: grid; grid-template-columns: repeat(12,minmax(0,1fr)); gap: 0 26px; align-items: center; }
.qnet-composition .chapter-title { grid-column: 1 / 5; grid-row: 1; align-self: end; }
.chapter-title h2 { font-size: clamp(82px,10vw,160px); line-height: .94; font-stretch: 85%; letter-spacing: -.06em; }
.word-prefix { display: block; margin-bottom: 14px; font-size: 28px; line-height: 1.25; font-stretch: 100%; font-weight: 450; letter-spacing: -.045em; }
.chapter-title .status { margin-top: 24px; }
.qnet-composition .chapter-copy { grid-column: 1 / 5; grid-row: 2; align-self: start; margin-top: 38px; }
.chapter-copy p { font-size: 17px; line-height: 1.7; }
.chapter-copy p:first-child { font-size: 24px; line-height: 1.45; letter-spacing: -.02em; }
.chapter-copy p + p { margin-top: 22px; color: var(--muted); }
.chapter-copy .text-link { margin-top: 30px; }
.qnet-composition .diagram { grid-column: 5 / -1; grid-row: 1 / 3; margin-block: 0; }
.chapter-model { background: var(--graphite); color: var(--paper); }
.model-header { display: grid; grid-template-columns: 1.2fr 1fr; gap: 10%; }
.model-header h2 { font-size: clamp(44px,5.2vw,80px); line-height: 1.1; max-width: 780px; font-stretch: 92%; }
.chapter-model .status { color: var(--dark-muted); margin-top: 20px; }
.chapter-model .status::before { background: var(--signal); }
.model-header p { font-size: 19px; line-height: 1.65; color: var(--dark-muted); }
.model-header p + p { margin-top: 24px; font-size: 16px; }
.mathematical-line { font-size: clamp(32px,6.1vw,92px); line-height: 1.25; letter-spacing: -.07em; color: var(--signal); margin-top: 72px; }
.math-key { display: flex; flex-wrap: wrap; gap: 20px 40px; color: var(--dark-muted); font-size: 14px; margin-top: 24px; }
.math-key span { display: flex; align-items: baseline; gap: 12px; }
.math-key b { color: var(--paper); font-family: var(--mono); font-size: 19px; font-weight: 400; }
.chapter-model .diagram { width: min(100%,1150px); margin: 54px auto 20px; }
.chapter-model .diagram figcaption { color: var(--dark-muted); }
.model-bottom { display: flex; align-items: baseline; justify-content: space-between; gap: 60px; padding-top: 30px; border-top: 1px solid #555e4a; }
.model-bottom p { color: var(--dark-muted); max-width: 680px; font-size: 15px; }
.model-bottom .text-link { color: var(--signal); flex-shrink: 0; }
.chapter-orchestration { background: var(--white); }
.orchestration-header { display: grid; grid-template-columns: 1fr 1fr; gap: 10%; }
.orchestration-header h2 { font-size: clamp(46px,5vw,76px); max-width: 580px; font-stretch: 88%; }
.orchestration-header .status { margin-top: 22px; }
.orchestration-header p { font-size: 19px; }
.orchestration-header p + p { margin-top: 24px; color: var(--muted); font-size: 16px; }
.chapter-orchestration .diagram { width: min(100%,1120px); margin: 66px auto 26px; }
.orchestration-bottom { display: flex; align-items: center; justify-content: space-between; gap: 40px; }
.orchestration-bottom p { color: var(--muted); max-width: 740px; font-size: 15px; }
.research-index { padding-block: var(--space-l); background: var(--white); }
.index-intro { display: grid; grid-template-columns: 1.2fr 1fr; gap: 10%; margin-bottom: 50px; }
.index-intro h2 { font-size: var(--chapter); max-width: 700px; font-stretch: 88%; }
.index-intro p { align-self: end; font-size: 18px; color: var(--muted); }
.research-entry { display: grid; grid-template-columns: 1.12fr .88fr; gap: 10%; align-items: start; padding-block: 34px; border-top: 1px solid var(--line); }
.research-entry h3 { font-size: clamp(28px,3.5vw,54px); line-height: 1.12; font-stretch: 92%; }
.research-entry h3 a { display: flex; align-items: baseline; justify-content: space-between; gap: 26px; }
.research-entry h3 svg { width: 25px; height: 25px; flex-shrink: 0; }
.research-entry p { max-width: 650px; font-size: 17px; color: var(--muted); }
.research-entry a:hover { color: var(--signal-ink); }
.stack-essay { padding-block: var(--space-l); }
.stack-essay h2 { font-size: clamp(32px,3.5vw,50px); max-width: 740px; margin-bottom: 50px; }
.stack-columns { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 46px 10%; margin-left: 16.67%; }
.stack-columns h3 { font-size: 24px; line-height: 1.2; margin-bottom: 18px; }
.stack-columns p { font-size: 17px; color: var(--muted); line-height: 1.75; }
.workflow-chapter { background: var(--mineral); padding-block: var(--space-l); }
.workflow-chapter h2 { font-size: var(--chapter); max-width: 940px; font-stretch: 85%; }
.workflow-chapter > .container > p { max-width: 780px; margin: 36px 0 0 auto; font-size: 19px; }
.workflow-chapter .diagram { margin-top: 46px; }
.flow { list-style: none; padding: 0; display: grid; grid-template-columns: repeat(4,minmax(0,1fr)); gap: 42px 36px; margin-top: 44px; }
.flow li > .mono { display: block; font-family: var(--sans); font-size: 14px; color: var(--muted); margin-bottom: 13px; }
.flow h3 { font-size: 28px; margin-bottom: 12px; }
.flow p { font-size: 15px; line-height: 1.75; color: var(--muted); }
.workflow-footnote { margin-top: 42px; color: var(--muted); font-size: 15px; max-width: 700px; }
.engineering-essay { display: grid; grid-template-columns: 1fr 1fr; gap: 10%; padding-block: var(--space-l); }
.engineering-essay h2 { font-size: clamp(36px,4.5vw,68px); font-stretch: 90%; }
.engineering-essay p { font-size: 18px; line-height: 1.75; }
.engineering-essay p + p { margin-top: 24px; }
.faq-section { padding-block: 12px var(--space-l); display: grid; grid-template-columns: 1fr 1.5fr; gap: 8%; }
.faq-section h2 { font-size: 30px; line-height: 1.25; max-width: 340px; }
.faq-list { min-width: 0; }
.faq-list details { padding-block: 20px; border-top: 1px solid var(--line); }
.faq-list summary { display: flex; align-items: center; justify-content: space-between; gap: 28px; min-height: 44px; list-style: none; cursor: pointer; font-size: 18px; line-height: 1.5; }
.faq-list summary::after { content: "+"; font-size: 25px; font-weight: 300; }
.faq-list details[open] summary::after { content: "−"; }
.faq-list p { margin-top: 22px; color: var(--muted); font-size: 17px; line-height: 1.75; }

/* Shared editorial infrastructure, applied after the home review. */
.breadcrumbs { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; padding-top: 34px; color: var(--muted); font-size: 13px; }
.breadcrumbs a { display: flex; align-items: center; min-height: 32px; }
.breadcrumbs a:hover { text-decoration: underline; text-underline-offset: 4px; }
.page-hero { padding-block: 60px 82px; }
.page-hero h1 { font-size: clamp(58px,7.9vw,126px); font-stretch: 85%; font-weight: 520; line-height: 1.02; max-width: 1240px; }
.page-description { max-width: 780px; margin: 38px 0 0 auto; font-size: 24px; line-height: 1.55; }
.page-context { max-width: 900px; margin: 34px 0 0; font-size: 18px; line-height: 1.75; color: var(--muted); }
.page-hero .hero-actions { margin-left: auto; max-width: 780px; }
.page-hero > .status { margin-bottom: 26px; }
.page-hero .diagram { margin: 56px auto 0; width: min(100%,1250px); }
.product-qnet .page-hero h1 { font-size: clamp(76px,11.8vw,182px); }
.product-qnet .page-hero .page-description { margin-left: 0; max-width: 850px; }
.product-model .product-intro { background: var(--graphite); color: var(--paper); }
.product-model .product-intro .breadcrumbs, .product-model .product-intro .status { color: var(--dark-muted); }
.product-model .product-intro .status::before { background: var(--signal); }
.product-model .page-hero h1 { font-size: clamp(58px,8vw,124px); }
.product-model .page-description { margin-left: 0; max-width: 890px; color: var(--dark-muted); }
.product-model .page-context { color: var(--dark-muted); }
.product-model .page-hero .diagram { max-width: 1100px; }
.product-model .product-intro .diagram figcaption { color: var(--dark-muted); }
.product-orchestration .page-hero { display: grid; grid-template-columns: 1fr 1fr; gap: 38px 8%; }
.product-orchestration .page-hero h1 { font-size: clamp(56px,6.4vw,100px); }
.product-orchestration .page-description { margin: 0; font-size: 22px; align-self: end; }
.product-orchestration .page-hero .status { grid-column: 1 / -1; margin: 0; }
.product-orchestration .page-hero .diagram { grid-column: 1 / -1; margin-top: 10px; width: min(100%,1180px); }
.product-orchestration .page-hero .hero-actions { grid-column: 1 / -1; margin: 0; }
.article-layout { display: grid; grid-template-columns: 210px minmax(0,1fr); gap: clamp(40px,6vw,96px); padding-top: 30px; }
.toc { position: sticky; top: 44px; align-self: start; }
.toc-title { font-size: 14px; color: var(--muted); margin-bottom: 18px; }
.toc nav a { display: block; padding-block: 9px; font-size: 15px; line-height: 1.45; }
.toc nav a:hover { text-decoration: underline; text-underline-offset: 4px; }
.toc-contact { display: inline-flex; align-items: center; gap: 20px; font-size: 14px; margin-top: 28px; min-height: 44px; }
.mobile-toc { display: none; }
.article-content { min-width: 0; }
.content-section { padding-block: 44px 60px; }
.content-section + .content-section { border-top: 1px solid var(--line); }
.content-section h2 { max-width: 930px; font-size: clamp(32px,3.45vw,52px); line-height: 1.13; font-stretch: 94%; margin-bottom: 30px; }
.section-body > p, .subsection p { max-width: 740px; font-size: 18px; line-height: 1.82; }
.section-body > p + p { margin-top: 23px; }
.article-content .section-body { padding-left: 6%; }
.subsection { margin-top: 40px; }
.subsection h3 { max-width: 760px; font-size: 26px; line-height: 1.25; margin-bottom: 20px; }
.subsection p + p { margin-top: 20px; }
.article-content .diagram { margin-left: -6%; width: 106%; margin-block: 46px; }
.article-content .diagram figcaption { padding-left: 6%; }
.article-content .flow { grid-template-columns: 1fr; gap: 0; margin-top: 40px; }
.article-content .flow li { display: grid; grid-template-columns: 34px 190px minmax(0,1fr); gap: 30px; padding-block: 25px; border-top: 1px solid var(--line); }
.article-content .flow li > .mono { margin: 5px 0 0; }
.article-content .flow h3 { font-size: 24px; line-height: 1.3; margin: 0; }
.article-content .flow p { font-size: 16px; line-height: 1.75; }
.concept-register { margin-top: 34px; }
.concept-entry { display: grid; grid-template-columns: .72fr 1.28fr; gap: 8%; padding-block: 28px; border-top: 1px solid var(--line); }
.concept-entry h3 { font-size: 25px; line-height: 1.25; max-width: 530px; }
.concept-entry h3 a { display: inline-flex; align-items: baseline; gap: 20px; }
.concept-entry p { font-size: 17px; line-height: 1.75; max-width: 740px; }
.concept-entry p + p { margin-top: 18px; }
.concept-entry .status { margin-bottom: 18px; }
.concept-entry h3 svg { flex-shrink: 0; }
.equation { margin-block: 36px; padding-block: 22px; border-block: 1px solid var(--line); }
.equation > p:first-child { font-size: clamp(26px,3.3vw,48px); letter-spacing: -.055em; line-height: 1.4; overflow-wrap: anywhere; }
.equation-caption { max-width: 800px; font-size: 15px; color: var(--muted); line-height: 1.7; margin-top: 22px; }
.callout { padding-left: 24px; border-left: 3px solid var(--signal-ink); margin-top: 34px; max-width: 800px; }
.callout p { font-size: 16px; line-height: 1.75; color: var(--muted); }
.reference-list { list-style: none; padding: 0; margin-top: 38px; }
.reference-list li { padding-block: 20px; border-top: 1px solid var(--line); }
.reference-list a { display: inline-flex; align-items: baseline; gap: 20px; font-size: 17px; text-decoration: underline; text-underline-offset: 5px; }
.reference-list span { display: block; margin-top: 12px; color: var(--muted); font-size: 14px; }
.wide-content { max-width: 1240px; }
.wide-content .content-section { display: grid; grid-template-columns: 1fr 1.3fr; gap: 8%; padding-block: 70px; }
.wide-content .content-section h2 { font-size: 40px; }
.wide-content .section-body { min-width: 0; }
.layout-contact .page-hero h1 { max-width: 1000px; }
.layout-contact #email { display: block; }
.layout-contact #email h2 { font-size: 27px; margin-bottom: 25px; }
.layout-contact #email .section-body > p { font-size: clamp(23px,4.1vw,64px); max-width: none; letter-spacing: -.04em; overflow-wrap: anywhere; }
.layout-contact #email p a { text-decoration-thickness: 1px; text-underline-offset: 9px; }
.layout-error .page-hero { padding-block: 70px 130px; }
.layout-error .page-description { margin-left: 0; }
.layout-error .hero-actions { margin-left: 0; }
.related-section { padding-block: 60px 70px; border-top: 1px solid var(--line); margin-top: 40px; }
.related-section h2 { font-size: 27px; font-weight: 400; margin-bottom: 28px; }
.related-grid { display: flex; flex-wrap: wrap; gap: 16px 40px; }
.related-grid a { display: inline-flex; align-items: center; min-height: 44px; gap: 20px; font-size: 19px; }
.related-grid a:hover { text-decoration: underline; text-underline-offset: 6px; }
.closing-contact { display: grid; grid-template-columns: 1fr 1fr; gap: 10%; padding-block: 60px var(--space-l); }
.closing-contact h2 { font-size: clamp(36px,4.9vw,76px); max-width: 750px; font-stretch: 90%; }
.closing-contact p { font-size: 16px; color: var(--muted); margin-top: 26px; max-width: 620px; }
.closing-contact > a { align-self: end; justify-self: start; overflow-wrap: anywhere; max-width: 100%; font-size: clamp(18px,2.1vw,31px); }
.closing-contact > a svg { flex-shrink: 0; }
.site-footer { background: var(--graphite); color: var(--paper); padding-block: 74px 30px; }
.footer-main { display: grid; grid-template-columns: 1.5fr .5fr 1fr; gap: 8%; }
.site-footer .brand { font-size: clamp(28px,3.45vw,54px); letter-spacing: -.065em; }
.site-footer .brand img { width: 44px; height: 44px; filter: invert(1); }
.footer-main > div > p { font-size: 17px; color: var(--dark-muted); margin-top: 26px; }
.footer-main .footer-identity { font-size: 13px; margin-top: 18px; }
.footer-main nav a { display: flex; align-items: center; min-height: 44px; font-size: 15px; }
.footer-main nav a:hover { text-decoration: underline; text-underline-offset: 5px; }
.footer-contact > span { display: block; color: var(--dark-muted); font-size: 13px; margin-bottom: 17px; }
.footer-contact a { display: flex; align-items: center; gap: 18px; min-height: 44px; font-size: 16px; overflow-wrap: anywhere; }
.footer-contact .resource-link { font-size: 13px; color: var(--dark-muted); }
.footer-bottom { display: flex; flex-wrap: wrap; align-items: center; gap: 20px 36px; color: var(--dark-muted); font-size: 13px; margin-top: 68px; padding-top: 24px; border-top: 1px solid #555e4a; }
.footer-bottom a { margin-left: auto; display: flex; align-items: center; min-height: 32px; }

@media (min-width: 1700px) { .editorial-hero { min-height: 900px; } .hero-field { right: 0; width: 870px; } }
@media (max-width: 1150px) {
  .desktop-nav { gap: 18px; }
  .nav-link { font-size: 14px; }
  .hero-field { right: -100px; top: 260px; }
  .hero-foot { gap: 44px; grid-template-columns: 1.2fr 1fr; }
  .hero-description { font-size: 18px; }
  .chapter-copy p:first-child { font-size: 21px; }
  .qnet-composition { gap: 0 18px; }
  .footer-main { grid-template-columns: 1.25fr .5fr 1fr; gap: 5%; }
  .site-footer .brand { font-size: 35px; }
  .article-layout { grid-template-columns: 180px minmax(0,1fr); gap: 40px; }
  .article-content .flow li { grid-template-columns: 30px 140px minmax(0,1fr); gap: 20px; }
}
@media (max-width: 1000px) {
  .desktop-nav { display: none; }
  .header-inner { min-height: 88px; }
  .mobile-menu { display: block; }
  .mobile-menu > summary { display: flex; align-items: center; gap: 18px; min-height: 44px; cursor: pointer; list-style: none; font-size: 15px; }
  .menu-symbol { position: relative; display: block; width: 19px; height: 19px; }
  .menu-symbol::before, .menu-symbol::after { content: ""; position: absolute; left: 0; top: 9px; width: 19px; height: 1px; background: currentColor; }
  .menu-symbol::after { transform: rotate(90deg); }
  .mobile-menu[open] .menu-symbol::after { transform: rotate(0); }
  .mobile-menu nav { position: absolute; top: 100%; left: 0; right: 0; max-height: calc(100svh - 108px); overflow-y: auto; overscroll-behavior: contain; padding: 28px 30px 34px; background: var(--white); border-top: 2px solid var(--graphite); box-shadow: 0 18px 25px #20231f12; }
  .mobile-menu .nav-link { font-size: 25px; min-height: 48px; }
  .mobile-subnav { padding-left: 24px; margin-bottom: 19px; }
  .mobile-subnav a { display: flex; align-items: center; min-height: 44px; font-size: 16px; color: var(--muted); }
  .hero-title { font-size: clamp(66px,9.6vw,98px); }
  .editorial-hero { min-height: 0; padding-bottom: 76px; }
  .hero-field { width: 64vw; right: -100px; top: 225px; }
  .hero-foot { grid-template-columns: 1.4fr 1fr; margin-top: 38px; }
  .hero-note { font-size: 12px; max-width: 440px; }
  .qnet-composition .chapter-title { grid-column: 1 / 6; }
  .qnet-composition .chapter-copy { grid-column: 1 / 6; }
  .qnet-composition .diagram { grid-column: 6 / -1; }
  .qnet-composition .diagram-desktop { display: none; }
  .qnet-composition .diagram-mobile { display: block; }
  .model-header, .orchestration-header { gap: 7%; }
  .mathematical-line { font-size: 6.4vw; }
  .flow { gap: 32px; }
  .flow h3 { font-size: 24px; }
  .stack-columns { margin-left: 0; }
  .article-layout { grid-template-columns: 1fr; gap: 0; padding-top: 0; }
  .toc { display: none; }
  .mobile-toc { display: block; border-block: 1px solid var(--line); }
  .mobile-toc summary { display: flex; align-items: center; justify-content: space-between; min-height: 54px; list-style: none; font-size: 16px; cursor: pointer; }
  .mobile-toc summary::after { content: "+"; font-size: 24px; }
  .mobile-toc[open] summary::after { content: "−"; }
  .mobile-toc nav { padding-block: 10px 20px; columns: 2; column-gap: 30px; }
  .mobile-toc nav a { display: block; min-height: 44px; padding-block: 10px; font-size: 15px; line-height: 1.5; break-inside: avoid; }
  .article-content .section-body { padding-left: 0; }
  .article-content .diagram { width: 100%; margin-left: 0; }
  .article-content .diagram figcaption { padding-left: 0; }
  .footer-main { grid-template-columns: 1.4fr .6fr; gap: 46px; }
  .footer-contact { grid-column: 1 / -1; }
  .site-footer .brand { font-size: 44px; }
  .wide-content .content-section { gap: 5%; }
  .product-orchestration .page-hero { gap: 32px 5%; }
  .product-orchestration .page-hero h1 { font-size: 6.8vw; }
}
@media (max-width: 700px) {
  :root { --gutter: 24px; --space-l: 74px; }
  .header-inner { min-height: 78px; }
  .brand { font-size: 20px; gap: 11px; }
  .brand img { width: 27px; height: 27px; }
  .editorial-hero { min-height: 0; padding-top: 42px; padding-bottom: 55px; }
  .hero-title { font-size: clamp(43px,13.2vw,85px); font-stretch: 75%; letter-spacing: -.058em; line-height: .97; }
  .hero-field { position: relative; width: calc(100% + 48px); right: auto; top: auto; margin: 18px -24px -16px; height: 220px; overflow: hidden; }
  .hero-field .diagram { position: absolute; inset: -50px 0 auto; }
  .hero-field svg { width: 100%; }
  .hero-field .detail-line { display: none; }
  .hero-field .field-peripheral { display: initial; }
  .hero-field figcaption { display: none; }
  .hero-foot { display: block; margin-top: 30px; }
  .hero-description { max-width: 580px; font-size: 17px; line-height: 1.65; }
  .hero-actions { gap: 20px; margin-top: 24px; }
  .hero-actions .text-link { font-size: 17px; }
  .hero-note { position: static; display: block; margin-top: 24px; max-width: 580px; font-size: 12px; }
  .diagram > .diagram-desktop { display: none; }
  .diagram > .diagram-mobile { display: block; }
  .diagram-model-to-system text { font-size: 36px; }
  .diagram-coupled-systems text { font-size: 40px; }
  .editorial-statement { padding-block: 64px 60px; }
  .editorial-statement h2 { font-size: 37px; margin-bottom: 30px; }
  .statement-columns { grid-template-columns: 1fr; gap: 24px; }
  .statement-columns > p { font-size: 20px; line-height: 1.65; }
  .statement-secondary p { font-size: 16px; }
  .portfolio-preface { grid-template-columns: 1fr; gap: 23px; padding-bottom: 30px; }
  .portfolio-preface h2 { font-size: 27px; }
  .portfolio-preface p { font-size: 16px; }
  .home-chapter { padding-block: 64px; }
  .chapter-qnet { padding-top: 35px; }
  .qnet-composition { grid-template-columns: 1fr; gap: 0; }
  .qnet-composition .chapter-title, .qnet-composition .chapter-copy, .qnet-composition .diagram { grid-column: 1; grid-row: auto; }
  .qnet-composition .diagram { order: 2; margin: 32px -12px 18px; width: calc(100% + 24px); }
  .qnet-composition .chapter-copy { order: 3; margin-top: 20px; }
  .chapter-title h2 { font-size: 98px; }
  .word-prefix { font-size: 25px; margin-bottom: 8px; }
  .chapter-title .status { margin-top: 18px; }
  .chapter-copy p:first-child { font-size: 22px; }
  .chapter-copy p + p { font-size: 16px; }
  .chapter-copy .text-link { margin-top: 20px; }
  .diagram figcaption { font-size: 12px; line-height: 1.65; }
  .diagram .detail-label { display: none; }
  .model-header, .orchestration-header { grid-template-columns: 1fr; gap: 26px; }
  .model-header h2 { font-size: 43px; }
  .model-header p, .orchestration-header p { font-size: 18px; }
  .mathematical-line { font-size: clamp(24px,5.75vw,40px); line-height: 1.4; letter-spacing: -.075em; margin-top: 38px; }
  .math-key { gap: 12px 22px; font-size: 12px; margin-top: 20px; }
  .math-key b { font-size: 16px; }
  .chapter-model .diagram { margin-top: 34px; }
  .model-bottom, .orchestration-bottom { display: block; }
  .model-bottom p, .orchestration-bottom p { font-size: 14px; }
  .model-bottom .text-link, .orchestration-bottom .text-link { margin-top: 22px; }
  .orchestration-header h2 { font-size: 46px; }
  .chapter-orchestration .diagram { margin-top: 36px; }
  .index-intro { grid-template-columns: 1fr; gap: 28px; margin-bottom: 32px; }
  .index-intro h2 { font-size: 50px; }
  .index-intro p { font-size: 17px; }
  .research-entry { grid-template-columns: 1fr; gap: 20px; padding-block: 27px; }
  .research-entry h3 { font-size: 32px; }
  .research-entry h3 svg { width: 20px; height: 20px; }
  .research-entry p { font-size: 16px; }
  .stack-essay h2 { font-size: 35px; margin-bottom: 35px; }
  .stack-columns { grid-template-columns: 1fr; gap: 33px; }
  .stack-columns h3 { font-size: 24px; margin-bottom: 14px; }
  .stack-columns p { font-size: 16px; }
  .workflow-chapter h2 { font-size: 48px; }
  .workflow-chapter > .container > p { margin-top: 30px; font-size: 18px; }
  .workflow-chapter .diagram { margin-block: 25px; }
  .flow { grid-template-columns: repeat(2,minmax(0,1fr)); gap: 36px 26px; margin-top: 30px; }
  .flow h3 { font-size: 25px; }
  .flow p { font-size: 15px; }
  .engineering-essay, .faq-section { grid-template-columns: 1fr; gap: 30px; }
  .engineering-essay h2 { font-size: 41px; }
  .engineering-essay p { font-size: 17px; }
  .faq-section h2 { font-size: 28px; max-width: 100%; }
  .faq-list summary { font-size: 17px; }
  .faq-list p { font-size: 16px; }
  .breadcrumbs { padding-top: 22px; font-size: 12px; gap: 7px; }
  .page-hero { padding-block: 35px 48px; }
  .page-hero h1 { font-size: clamp(45px,11.6vw,78px); letter-spacing: -.045em; }
  .page-description { margin-top: 26px; font-size: 20px; }
  .page-context { font-size: 17px; margin-top: 28px; }
  .page-hero .hero-actions { margin-top: 26px; }
  .page-hero .diagram { margin-top: 36px; }
  .product-qnet .page-hero h1 { font-size: 19vw; }
  .product-model .page-hero h1 { font-size: 12.5vw; }
  .product-model .page-hero .mathematical-line { margin-top: 38px; }
  .product-orchestration .page-hero { grid-template-columns: 1fr; gap: 26px; }
  .product-orchestration .page-hero h1 { font-size: 12vw; }
  .product-orchestration .page-description { font-size: 19px; }
  .product-orchestration .page-hero .diagram { margin-top: 12px; }
  .content-section { padding-block: 36px 44px; }
  .content-section h2 { font-size: 34px; margin-bottom: 25px; }
  .section-body > p, .subsection p { font-size: 17px; line-height: 1.82; }
  .section-body > p + p { margin-top: 22px; }
  .subsection { margin-top: 32px; }
  .subsection h3 { font-size: 24px; }
  .article-content .diagram { margin-block: 35px; }
  .mobile-toc nav { columns: 1; }
  .article-content .flow li { grid-template-columns: 26px minmax(0,1fr); gap: 8px 16px; padding-block: 24px; }
  .article-content .flow li p { grid-column: 2; font-size: 16px; }
  .article-content .flow h3 { font-size: 24px; }
  .concept-entry { grid-template-columns: 1fr; gap: 20px; }
  .concept-entry p { font-size: 16px; }
  .equation > p:first-child { font-size: 25px; }
  .equation-caption { font-size: 14px; }
  .wide-content .content-section { grid-template-columns: 1fr; gap: 0; padding-block: 40px; }
  .wide-content .content-section h2 { font-size: 35px; }
  .closing-contact { grid-template-columns: 1fr; gap: 30px; padding-block: 42px 65px; }
  .closing-contact h2 { font-size: 43px; }
  .closing-contact > a { font-size: 20px; gap: 14px; }
  .related-section { padding-block: 40px; margin-top: 20px; }
  .related-grid { display: grid; gap: 12px; }
  .related-grid a { justify-content: space-between; font-size: 18px; }
  .site-footer { padding-block: 50px 26px; }
  .footer-main { grid-template-columns: 1fr; gap: 30px; }
  .site-footer .brand { font-size: 33px; gap: 12px; }
  .site-footer .brand img { width: 34px; height: 34px; }
  .footer-main > div > p { margin-top: 20px; font-size: 16px; }
  .footer-main nav { display: flex; flex-wrap: wrap; gap: 0 26px; }
  .footer-contact { grid-column: auto; }
  .footer-bottom { gap: 13px 24px; margin-top: 40px; }
  .footer-bottom a { margin-left: 0; }
  .layout-error .page-hero { padding-block: 50px 90px; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } *, *::before, *::after { animation: none !important; transition: none !important; } }
@media (forced-colors: active) { .status::before { background: CanvasText; } a:focus-visible, summary:focus-visible { outline-color: Highlight; } }
@media print { body { color: black; background: white; } .container { width: 100%; } .site-header, .site-footer, .toc, .mobile-toc, .hero-actions, .hero-field, .closing-contact { display: none; } .article-layout { display: block; } .content-section, .home-chapter { padding-block: 25px; } .chapter-model { color: black; background: white; } .chapter-model p { color: black; } .section-body a[href^="https:"]::after { content: " (" attr(href) ")"; font-size: .8em; overflow-wrap: anywhere; } .diagram, .equation, .flow li { break-inside: avoid; } }