@import url("design/tokens.css");
@font-face { font-family: "Manrope"; src: url("assets/manrope-latin.woff2") format("woff2"); font-style: normal; font-weight: 400 800; font-display: swap; }

/* Base and shared controls. */
*, *::before, *::after { box-sizing: border-box; }
[hidden] { display: none !important; }
html { scroll-behavior: smooth; scroll-padding-top: 104px; }
body { min-width: 320px; margin: 0; color: var(--color-text); background: var(--color-bg); font: var(--text-base)/1.65 var(--font-sans); -webkit-font-smoothing: antialiased; }
body.nav-open { overflow: hidden; }
img { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; text-underline-offset: .2em; }
button, input, select, textarea { font: inherit; }
button, a, input, select, textarea, summary { -webkit-tap-highlight-color: transparent; }
button, summary { touch-action: manipulation; cursor: pointer; }
:focus-visible { outline: 3px solid var(--color-focus); outline-offset: 5px; }
h1, h2, h3, p, figure { margin: 0; }
h1, h2, h3 { color: var(--color-text); text-wrap: balance; }
h1 { font-size: var(--text-hero); font-weight: 550; line-height: 1.06; letter-spacing: -.05em; }
h2 { font-size: var(--text-section); font-weight: 550; line-height: 1.13; letter-spacing: -.05em; }
h3 { font-size: var(--text-card); font-weight: 650; line-height: 1.3; letter-spacing: -.025em; }
p { text-wrap: pretty; }
p + p { margin-top: var(--space-4); }
strong { font-weight: 700; }
code { font-family: var(--font-mono); font-size: .9em; overflow-wrap: anywhere; }
.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; }
.skip-link { position: fixed; top: 12px; left: 16px; z-index: 100; padding: 10px 16px; color: var(--color-inverse); background: var(--color-text); transform: translateY(-180%); }
.skip-link:focus { transform: translateY(0); }
.section-frame, .site-header, .site-footer { width: min(100%, var(--container-max)); margin-inline: auto; padding-inline: var(--section-gutter); }
.section-pad { padding-block: var(--section-space); }
.eyebrow { margin-bottom: var(--space-5); color: var(--color-accent-hover); font-size: var(--text-sm); font-weight: 650; letter-spacing: .005em; }
.button, .nav-cta { display: inline-flex; align-items: center; justify-content: center; gap: 10px; min-height: var(--control-height); padding: 12px 21px; border: 1px solid transparent; border-radius: var(--radius-control); font-size: var(--text-sm); font-weight: 650; line-height: 1.4; text-align: center; transition: background-color var(--duration-fast), border-color var(--duration-fast), box-shadow var(--duration-fast); }
.button.primary, .nav-cta { background: var(--color-accent); color: var(--color-inverse); box-shadow: var(--shadow-control); }
.button.primary:hover, .nav-cta:hover { background: var(--color-accent-hover); box-shadow: var(--shadow-control-hover); }
.button.secondary { color: var(--color-text); background: transparent; border-color: var(--color-border-strong); }
.button.secondary:hover { background: var(--color-surface); border-color: var(--color-text-muted); }
.button.large { min-height: 52px; padding-inline: 24px; }
button:disabled { cursor: not-allowed; opacity: .65; }

/* Navigation. */
.site-header, .guide-header { display: flex; align-items: center; justify-content: space-between; gap: 28px; min-height: 92px; border-bottom: 1px solid var(--color-border); }
.site-header { position: sticky; top: 0; z-index: 40; background: var(--header-bg); backdrop-filter: blur(16px); }
.site-header.is-scrolled { box-shadow: var(--shadow-header); }
.brand { display: inline-flex; flex-shrink: 0; align-items: center; min-height: 44px; }
.brand-wordmark { width: 100px; height: auto; }
.site-nav, .guide-nav { display: flex; align-items: center; gap: 30px; }
.site-nav > a, .guide-nav > a { display: inline-flex; align-items: center; min-height: 44px; font-size: var(--text-sm); font-weight: 600; }
.site-nav > a:not(.nav-cta):hover, .guide-nav > a:not(.button):hover { color: var(--color-accent-hover); }
.nav-toggle { display: none; align-items: center; gap: 10px; min-height: 44px; padding: 8px 12px; border: 1px solid var(--color-border); border-radius: var(--radius-control); background: var(--color-surface); color: var(--color-text); }
.nav-toggle > span { display: grid; gap: 4px; }
.nav-toggle i { display: block; width: 16px; height: 1px; background: currentColor; }
.nav-toggle b { font-size: var(--text-sm); font-weight: 600; }

/* Homepage. Artwork illustrates the concept, not a released interface. */
.hero { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); align-items: center; gap: clamp(28px, 4vw, 64px); padding-block: clamp(56px, 7vw, 108px); }
.hero-copy { min-width: 0; max-width: 620px; }
.hero h1 { max-width: 11ch; }
.hero-lede { max-width: 44ch; margin-top: var(--space-6); color: var(--color-text-body); font-size: var(--text-lg); line-height: 1.6; }
.hero-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; margin-top: var(--space-8); }
.hero-note { max-width: 45ch; margin-top: 18px; color: var(--color-text-muted); font-size: var(--text-sm); }
.hero-note a, .scope-note a, .scope-availability a, .setup-note a { color: var(--color-accent-hover); text-decoration: underline; }
.hero-art { min-width: 0; margin: 0; }
.hero-art > img, .hero-art picture img { width: 100%; border-radius: var(--radius-illustration); object-fit: contain; }
.hero-art-caption { display: flex; align-items: flex-start; justify-content: space-between; gap: 20px; padding: 18px 4px 0; border-top: 1px solid var(--color-border); color: var(--color-text-muted); font-size: var(--text-xs); line-height: 1.6; }
.hero-art-caption strong { color: var(--color-text); font-weight: 650; }
.editorial-intro { max-width: 900px; }
.editorial-intro h2 { max-width: 22ch; }
.editorial-intro > p:last-child { max-width: 65ch; margin-top: 24px; color: var(--color-text-body); font-size: var(--text-lg); }
.section-heading { margin-bottom: var(--space-10); }
.section-heading h2 { max-width: 23ch; }
.section-heading > p:last-child:not(.eyebrow), .split-heading > p { max-width: 58ch; color: var(--color-text-body); }
.split-heading { display: grid; grid-template-columns: 1.1fr .9fr; align-items: end; gap: clamp(32px, 7vw, 100px); }
.compact-problem, .development-scope, .problem, .fit, .faq { border-top: 1px solid var(--color-border); }
.compact-problem { padding-block: 64px; }
.compact-problem .section-heading { margin-bottom: 0; }
.compact-problem h2 { font-size: clamp(1.7rem, 3vw, 2.75rem); }
.sequence-caption { display: flex; flex-wrap: wrap; gap: 10px 24px; align-items: baseline; margin-bottom: 22px; color: var(--color-text-muted); font-size: var(--text-sm); }
.sequence-caption > span { color: var(--color-accent-hover); font-weight: 650; }
.integration-examples { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 0; list-style: none; padding: 0; margin: 0 0 48px; border-block: 1px solid var(--color-border); }
.integration-examples > li { padding: 28px 22px; }
.integration-examples > li:first-child { padding-left: 0; }
.integration-examples > li + li { border-left: 1px solid var(--color-border); }
.integration-examples strong { display: block; font-size: 1.08rem; }
.integration-examples p { margin: 10px 0 16px; color: var(--color-text-body); font-size: var(--text-sm); }
.integration-examples a { color: var(--color-accent-hover); text-decoration: underline; font-size: var(--text-xs); }
.process-grid, .sync-sequence { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 32px; margin: 0; padding: 0; list-style: none; }
.process-grid > li, .sync-sequence > li { min-width: 0; border-top: 1px solid var(--color-border-strong); padding-top: 24px; }
.process-grid li > span, .sequence-number { display: block; margin-bottom: 28px; color: var(--color-accent); font: .85rem/1.5 var(--font-mono); }
.process-grid p, .provider-condition { margin-top: 16px; color: var(--color-text-body); font-size: .96rem; }
.customer-assertion { margin-top: 22px; padding-top: 18px; border-top: 1px solid var(--color-border); font-size: .95rem; }
.customer-assertion > span { display: block; margin-bottom: 8px; color: var(--color-accent-hover); font-size: var(--text-xs); font-weight: 700; }
.scope-note, .setup-note { max-width: 82ch; margin-top: 30px; color: var(--color-text-body); font-size: var(--text-sm); }
.scope-availability { max-width: 82ch; margin-top: 12px; color: var(--color-text-muted); font-size: var(--text-xs); }
.approach-link, .approach-download { margin-top: 26px; font-size: var(--text-sm); }
.approach-link a, .approach-download a { color: var(--color-accent-hover); text-decoration: underline; }
.continuation-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; }
.continuation-grid article { min-width: 0; border-top: 1px solid var(--color-border-strong); padding-top: 26px; }
.continuation-grid article > span { display: block; margin-bottom: 26px; color: var(--color-accent-hover); font-size: var(--text-sm); font-weight: 650; }
.continuation-grid h3 { max-width: 24ch; font-size: clamp(1.3rem, 2vw, 1.75rem); }
.continuation-grid p { margin-top: 18px; color: var(--color-text-body); }
.continuation-grid .maintenance-detail { color: var(--color-text-muted); font-size: var(--text-sm); }
.sequence-details { margin-top: 32px; padding-block: 22px; border-block: 1px solid var(--color-border); }
.sequence-details > summary { padding-block: 8px; font-weight: 650; }
.sequence-details[open] > summary { margin-bottom: 28px; }

/* Hypothetical case explorer. */
.scenario-lab { margin-top: 44px; padding: clamp(22px, 4vw, 48px); border: 1px solid var(--color-border); border-radius: var(--radius-panel); background: var(--color-surface); box-shadow: var(--shadow-surface); }
.scenario-disclaimer { margin-bottom: 24px; max-width: 75ch; color: var(--color-text-muted); font-size: var(--text-xs); }
.scenario-tabs { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 36px; }
.scenario-tabs button { min-height: 46px; padding: 10px 18px; border: 1px solid var(--color-border); border-radius: var(--radius-control); color: var(--color-text-body); background: var(--color-bg); font-size: var(--text-sm); font-weight: 650; }
.scenario-tabs button:hover { border-color: var(--color-accent); }
.scenario-tabs button[aria-selected="true"], .scenario-tabs button[aria-pressed="true"] { color: var(--color-inverse); background: var(--color-accent); border-color: var(--color-accent); }
.scenario-panel h3 { margin-bottom: 16px; font-size: 1.5rem; }
.scenario-panel > p { color: var(--color-text-body); max-width: 72ch; }
.scenario-states { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 24px; margin-block: 24px; }
.scenario-state { min-width: 0; padding: 24px; border: 1px solid var(--color-border); border-radius: var(--radius-surface); background: var(--color-bg); }
.scenario-state:last-child { background: var(--color-accent-subtle); border-color: var(--color-accent-line); }
.scenario-state > span, .scenario-state > small { display: block; margin-bottom: 18px; color: var(--color-text-muted); font-size: var(--text-xs); font-weight: 650; }
.scenario-state > strong { display: block; font-size: 1.08rem; line-height: 1.4; }
.scenario-state p { margin-top: 12px; color: var(--color-text-body); font-size: var(--text-sm); }
.scenario-state svg { width: 28px; height: 28px; margin-bottom: 22px; color: var(--color-accent); }
.scenario-meaning { padding-top: 18px; border-top: 1px solid var(--color-border); font-size: var(--text-sm); }
.scenario-panel > small { display: block; color: var(--color-text-muted); font-size: var(--text-xs); }
html:not(.js) .scenario-tabs { display: none; }
html:not(.js) .scenario-panel + .scenario-panel { margin-top: 36px; padding-top: 28px; border-top: 1px solid var(--color-border); }

/* Ownership diagram. */
.environment-view { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 24px; margin: 0 0 44px; padding: clamp(22px, 3vw, 36px); border: 1px solid var(--color-border); border-radius: var(--radius-panel); background: var(--color-surface); }
.environment-view figcaption { grid-column: 1 / -1; }
.environment-view figcaption > span { display: block; color: var(--color-text-muted); font-size: var(--text-xs); }
.environment-view figcaption strong { display: block; margin-top: 8px; font-size: 1.2rem; }
.environment-node, .application-checks { padding: 22px; border: 1px solid var(--color-border); border-radius: var(--radius-surface); background: var(--color-bg); }
.environment-node > span, .application-checks > span { display: block; margin-bottom: 8px; font-size: var(--text-xs); }
.environment-node > strong, .application-checks > strong { display: block; font-size: 1.16rem; }
.environment-node > p, .application-checks p { margin-top: 8px; font-size: var(--text-sm); }
.provider-node { color: var(--color-inverse); background: var(--color-accent-hover); border-color: var(--color-accent-hover); }
.environment-connection { display: none; }
.environment-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 20px; }
.environment-tags > span { padding: 3px 8px; border: 1px solid currentColor; border-radius: 4px; font-size: .72rem; }
.application-checks p { color: var(--color-text-body); }
.environment-view > small { display: block; grid-column: 1 / -1; color: var(--color-text-muted); font-size: var(--text-xs); }

/* FAQ and access request. */
.faq { display: grid; grid-template-columns: .75fr 1.25fr; gap: clamp(36px, 6vw, 84px); }
.faq-list { border-top: 1px solid var(--color-border-strong); }
.faq-list details { border-bottom: 1px solid var(--color-border); }
.faq-list summary { display: flex; align-items: center; justify-content: space-between; gap: 24px; padding: 25px 0; list-style: none; font-size: 1rem; font-weight: 650; }
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary::after { content: "+"; color: var(--color-accent); font-size: 1.4rem; font-weight: 400; }
.faq-list details[open] summary::after { content: "−"; }
.faq-list details p { padding: 0 36px 26px 0; color: var(--color-text-body); font-size: .95rem; }
.contact { display: grid; grid-template-columns: .95fr 1.05fr; gap: clamp(36px, 6vw, 84px); border-top: 1px solid var(--color-border); }
.contact-copy h2 { max-width: 15ch; }
.contact-copy > p:not(.eyebrow) { max-width: 47ch; margin-top: 24px; color: var(--color-text-body); }
.contact-copy .contact-status { font-size: var(--text-sm); color: var(--color-text-muted); }
.contact-proof-link a { color: var(--color-accent-hover); font-size: var(--text-sm); text-decoration: underline; }
.request-form { display: grid; gap: 24px; padding: clamp(24px, 3vw, 40px); border: 1px solid var(--color-border); border-radius: var(--radius-panel); background: var(--color-surface); }
.request-form label { display: grid; gap: 10px; }
.request-form label > span { font-size: var(--text-sm); font-weight: 650; }
.request-form label small { color: var(--color-text-muted); font-weight: 400; }
.request-form input, .request-form select, .request-form textarea { width: 100%; min-width: 0; border: 1px solid var(--color-border-strong); border-radius: var(--radius-control); background: var(--color-surface); color: var(--color-text); padding: 12px 14px; font-size: 1rem; }
.request-form input, .request-form select { min-height: 48px; }
.request-form textarea { resize: vertical; min-height: 110px; }
.request-form input:hover, .request-form textarea:hover { border-color: var(--color-text-muted); }
.request-form input:focus, .request-form textarea:focus { border-color: var(--color-accent); }
.request-form ::placeholder { color: var(--color-text-muted); opacity: 1; }
.form-submit { display: flex; flex-wrap: wrap; align-items: flex-start; gap: 18px; }
.form-submit .button { white-space: nowrap; }
.form-submit p { flex: 1 1 180px; color: var(--color-text-muted); font-size: var(--text-xs); }
.privacy-note { margin: 0; color: var(--color-text-muted); font-size: var(--text-xs); }
.privacy-note a { text-decoration: underline; }
.request-form button:disabled { opacity: .65; cursor: wait; }
.form-status { padding: 14px 16px; border-left: 3px solid currentColor; background: var(--color-bg); font-size: var(--text-sm); }
.form-status[data-state="error"] { color: var(--color-negative); }
.form-status[data-state="success"] { color: var(--color-positive); }
.site-footer, .guide-footer { display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 40px; padding-block: 44px; color: var(--color-inverse); background: var(--color-footer); }
.site-footer p, .guide-footer p { max-width: 46ch; color: var(--color-footer-muted); font-size: var(--text-sm); }
.footer-button, .guide-footer > a:last-child:not(.brand) { color: var(--color-inverse); font-size: var(--text-sm); }
.footer-button { border-color: var(--color-footer-border); }
.footer-button:hover { background: var(--color-footer-hover); }
.guide-footer > a:last-child:not(.brand) { text-decoration: underline; }

/* Guide library and long-form reading. */
.guide-hero, .guide-index-hero, .approach-hero { padding-block: clamp(48px, 7vw, 100px); }
.guide-hero h1, .guide-index-hero h1, .approach-hero h1 { max-width: 20ch; font-size: clamp(2.5rem, 4.9vw, 4.6rem); }
.guide-dek, .guide-index-hero > p:last-child { max-width: 65ch; margin-top: 26px; font-size: var(--text-lg); color: var(--color-text-body); }
.breadcrumbs { display: flex; gap: 14px; margin-bottom: 40px; color: var(--color-text-muted); font-size: var(--text-xs); }
.breadcrumbs a { text-decoration: underline; }
.guide-meta { display: flex; flex-wrap: wrap; gap: 10px 24px; margin-top: 30px; font-size: var(--text-xs); color: var(--color-text-muted); }
.guide-article-layout { display: grid; grid-template-columns: 190px minmax(0, 1fr); gap: clamp(28px, 4vw, 64px); align-items: start; }
.guide-article-content { min-width: 0; }
.guide-toc { position: sticky; top: 32px; padding-top: 8px; font-size: var(--text-xs); }
.guide-toc > p { margin-bottom: 18px; font-weight: 700; }
.guide-toc ol { margin: 0; padding: 0; list-style: none; border-left: 1px solid var(--color-border); }
.guide-toc li a { display: block; padding: 8px 0 8px 18px; color: var(--color-text-muted); }
.guide-toc li a:hover { color: var(--color-accent-hover); }
.guide-answer { padding: clamp(24px, 3vw, 40px); background: var(--color-accent-subtle); border: 1px solid var(--color-accent-line); border-radius: var(--radius-panel); }
.guide-answer .eyebrow { margin-bottom: 16px; }
.guide-answer p:last-child { max-width: 70ch; font-size: 1.08rem; }
.scenario-note { display: flex; flex-wrap: wrap; gap: 8px 18px; padding-block: 24px; color: var(--color-text-muted); font-size: var(--text-xs); }
.scenario-note strong { color: var(--color-text-body); }
.guide-section { padding-block: 44px; }
.guide-section + .guide-section { border-top: 1px solid var(--color-border); }
.guide-section > p, .guide-section-heading + p { max-width: 75ch; color: var(--color-text-body); }
.guide-section > p + p { margin-top: 20px; }
.guide-section-heading { margin-bottom: 28px; }
.guide-section-heading h2 { max-width: 28ch; font-size: clamp(1.6rem, 2.5vw, 2.4rem); }
.guide-concept-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 24px; }
.guide-concept-grid article { padding-top: 20px; border-top: 2px solid var(--color-accent-line); }
.guide-concept-grid span, .guide-card > span { display: block; color: var(--color-accent-hover); font-size: var(--text-xs); font-weight: 650; }
.guide-concept-grid h3 { margin-top: 18px; font-size: 1.12rem; }
.guide-concept-grid p { margin-top: 16px; color: var(--color-text-body); font-size: var(--text-sm); }
.guide-steps, .guide-checklist, .source-list, .related-guides ul { list-style: none; margin: 0; padding: 0; }
.guide-steps { display: grid; grid-template-columns: 1fr 1fr; gap: 0 32px; }
.guide-steps li { display: grid; grid-template-columns: 26px 1fr; gap: 16px; padding: 24px 0; border-top: 1px solid var(--color-border); }
.guide-steps li > span { color: var(--color-accent); font: var(--text-xs)/1.7 var(--font-mono); }
.guide-steps h3 { font-size: 1.1rem; }
.guide-steps p { margin-top: 10px; color: var(--color-text-body); font-size: var(--text-sm); }
.guide-checklist { display: grid; grid-template-columns: 1fr 1fr; gap: 0 32px; }
.guide-checklist li { position: relative; padding: 20px 0 20px 28px; border-top: 1px solid var(--color-border); font-size: .95rem; }
.guide-checklist li::before { content: ""; position: absolute; left: 0; top: 26px; width: 12px; height: 12px; border: 1px solid var(--color-accent); border-radius: 3px; }
.coverage-table-wrap, .table-scroll { max-width: 100%; overflow-x: auto; }
.coverage-table { width: 100%; border-collapse: collapse; font-size: var(--text-sm); text-align: left; }
.coverage-table caption { padding-bottom: 16px; text-align: left; color: var(--color-text-muted); font-size: var(--text-xs); }
.coverage-table th, .coverage-table td { padding: 18px; border: 1px solid var(--color-border); vertical-align: top; }
.coverage-table thead { background: var(--color-accent-subtle); }
.coverage-table tbody th { font-weight: 650; }
.guide-matrix .coverage-table { min-width: 640px; }
.guide-table-hint { display: none; }
.guide-artifact { border: 1px solid var(--color-border-strong); border-radius: var(--radius-surface); background: var(--color-surface); overflow: hidden; }
.artifact-label { padding: 18px 24px; background: var(--color-bg-subtle); border-bottom: 1px solid var(--color-border); color: var(--color-text-muted); font: var(--text-xs)/1.6 var(--font-mono); }
.artifact-record { display: grid; grid-template-columns: 1fr 1fr; margin: 0; }
.artifact-record > div { padding: 24px; border-bottom: 1px solid var(--color-border); }
.artifact-record > div:nth-child(odd) { border-right: 1px solid var(--color-border); }
.artifact-record dt { margin-bottom: 10px; color: var(--color-text-muted); font-size: var(--text-xs); }
.artifact-record dd { margin: 0; font-size: var(--text-sm); overflow-wrap: anywhere; }
.guide-not-needed { margin-top: 32px; padding: clamp(24px, 3vw, 40px); border: 1px solid var(--color-border); border-radius: var(--radius-panel); background: var(--color-bg-subtle); }
.guide-not-needed h2 { max-width: 30ch; margin-bottom: 20px; font-size: clamp(1.5rem, 2.3vw, 2rem); }
.guide-not-needed p { color: var(--color-text-body); max-width: 72ch; font-size: .96rem; }
.guide-cta, .guide-index-cta { display: flex; align-items: center; justify-content: space-between; gap: 40px; padding-block: var(--section-space); }
.guide-cta { flex-direction: column; align-items: flex-start; gap: 28px; }
.guide-cta > div, .guide-index-cta > div { max-width: 730px; }
.guide-cta h2, .guide-index-cta h2 { font-size: clamp(1.9rem, 3.1vw, 2.8rem); max-width: 25ch; }
.guide-cta p:not(.eyebrow), .guide-index-cta p:not(.eyebrow) { margin-top: 22px; color: var(--color-text-body); }
.guide-stage { font-size: var(--text-sm); }
.guide-cta > .button, .guide-index-cta > .button { flex-shrink: 0; }
.guide-sources { border-top: 1px solid var(--color-border); padding-block: 44px; }
.guide-sources h2 { margin-bottom: 24px; font-size: 1.6rem; }
.source-list li { padding-bottom: 20px; }
.source-list a { color: var(--color-accent-hover); text-decoration: underline; font-size: var(--text-sm); }
.source-list span { display: block; margin-top: 8px; color: var(--color-text-muted); font-size: var(--text-xs); }
.guide-sources > div:last-child > p { color: var(--color-text-muted); font-size: var(--text-xs); }
.related-guides { padding-block: 48px; border-top: 1px solid var(--color-border); }
.related-guides ul { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.related-guides a { display: block; height: 100%; padding: 24px; border: 1px solid var(--color-border); border-radius: var(--radius-surface); background: var(--color-surface); }
.related-guides a:hover { border-color: var(--color-accent); }
.related-guides span { display: block; margin-bottom: 12px; color: var(--color-text-muted); font-size: var(--text-xs); }
.related-guides strong { font-size: 1.1rem; }
.guide-group { padding-block: 48px 64px; border-top: 1px solid var(--color-border); }
.guide-group-heading { display: grid; grid-template-columns: 1fr 1fr; gap: 0 60px; align-items: end; margin-bottom: 40px; }
.guide-group-heading .eyebrow { grid-column: 1; margin-bottom: 14px; }
.guide-group-heading h2 { grid-column: 1; font-size: 2rem; }
.guide-group-heading > p:last-child { grid-column: 2; grid-row: 1 / 3; max-width: 55ch; color: var(--color-text-body); }
.guide-card-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.guide-card { display: flex; flex-direction: column; min-width: 0; padding: clamp(24px, 3.5vw, 44px); background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-panel); transition: border-color var(--duration-fast); }
.guide-card:hover { border-color: var(--color-accent); }
.guide-card h2 { margin-top: 26px; font-size: clamp(1.4rem, 2.1vw, 1.85rem); letter-spacing: -.035em; }
.guide-card h2 a:hover { color: var(--color-accent-hover); }
.guide-card p { margin: 18px 0 30px; color: var(--color-text-body); font-size: var(--text-sm); }
.guide-card-link { align-self: flex-start; margin-top: auto; color: var(--color-accent-hover); font-size: var(--text-sm); font-weight: 650; }
.guide-card-link span { margin-left: 10px; }

/* Approach and printable early-access brief. */
.approach-main { max-width: 1180px; }
.approach-status { max-width: 75ch; margin-top: 24px; color: var(--color-text-muted); font-size: var(--text-sm); }
.approach-summary { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; margin: 40px 0 0; padding-top: 24px; border-top: 1px solid var(--color-border); }
.approach-summary dt { margin-bottom: 12px; font-size: var(--text-xs); color: var(--color-accent-hover); font-weight: 650; }
.approach-summary dd { margin: 0; font-size: var(--text-sm); color: var(--color-text-body); }
.approach-section { padding-block: 44px; border-top: 1px solid var(--color-border); }
.approach-section h2 { max-width: 26ch; margin-bottom: 24px; font-size: clamp(1.6rem, 3vw, 2.6rem); }
.approach-section > p:not(.eyebrow) { max-width: 78ch; color: var(--color-text-body); }
.approach-steps { display: grid; gap: 20px; max-width: 80ch; margin: 24px 0 0; padding-left: 24px; }
.approach-steps li { padding-left: 8px; }
.approach-steps li::marker { color: var(--color-accent-hover); font-weight: 650; }
.approach-cta { display: flex; align-items: center; justify-content: space-between; gap: 40px; padding-block: 56px 80px; border-top: 1px solid var(--color-border); }
.approach-cta > div { max-width: 650px; }
.approach-cta h2 { font-size: clamp(1.8rem, 3vw, 2.5rem); }
.approach-cta p:not(.eyebrow) { margin-top: 20px; color: var(--color-text-body); }
.approach-cta .button { flex-shrink: 0; }
.result-state { display: inline-block; padding: 4px 8px; border-radius: 4px; font: var(--text-xs)/1.5 var(--font-mono); }
.result-state.is-fail { color: var(--color-negative); background: var(--color-negative-subtle); }
.result-state.is-pass { color: var(--color-positive); background: var(--color-positive-subtle); }
.result-state.is-untested { color: var(--color-warning); background: var(--color-warning-subtle); }

/* Responsive composition and progressive enhancement. */
@media (max-width: 1080px) {
  .hero { gap: 28px; }
  .hero h1 { font-size: clamp(2.8rem, 5.4vw, 4rem); }
  .nav-toggle { display: inline-flex; }
  .site-nav { position: absolute; top: 100%; inset-inline: 0; display: none; flex-direction: column; align-items: stretch; gap: 0; padding: 12px var(--section-gutter) 24px; background: var(--color-bg); border-bottom: 1px solid var(--color-border); box-shadow: var(--shadow-surface); }
  .site-nav.is-open { display: flex; }
  .site-nav > a { min-height: 48px; }
  .site-nav > a:not(.nav-cta) { border-bottom: 1px solid var(--color-border); }
  .site-nav .nav-cta { margin-top: 16px; }
  .scenario-states { gap: 14px; }
  .scenario-state { padding: 20px; }
  .guide-article-layout { grid-template-columns: 155px minmax(0, 1fr); gap: 32px; }
  .guide-concept-grid { grid-template-columns: 1fr; }
  .faq { grid-template-columns: .8fr 1.2fr; gap: 40px; }
}
@media (max-width: 800px) {
  .hero, .split-heading, .faq, .contact { grid-template-columns: 1fr; }
  .hero { gap: 40px; padding-block: 56px 64px; }
  .hero-copy { max-width: 650px; }
  .hero h1 { max-width: 15ch; font-size: clamp(2.8rem, 7.7vw, 4.4rem); }
  .hero-art { width: min(100%, 640px); margin-inline: auto; }
  .split-heading { gap: 26px; }
  .section-heading { margin-bottom: 32px; }
  .faq .section-heading { margin-bottom: 0; }
  .integration-examples { grid-template-columns: 1fr 1fr; }
  .integration-examples > li:nth-child(3) { padding-left: 0; border-left: 0; }
  .integration-examples > li:nth-child(n+3) { border-top: 1px solid var(--color-border); }
  .scenario-states, .environment-view { grid-template-columns: 1fr; }
  .guide-article-layout { grid-template-columns: 1fr; gap: 28px; }
  .guide-toc { position: static; padding-bottom: 24px; border-bottom: 1px solid var(--color-border); }
  .guide-toc ol { display: flex; flex-wrap: wrap; gap: 4px 18px; border-left: 0; }
  .guide-toc li a { padding: 5px 0; text-decoration: underline; }
  .guide-index-cta, .approach-cta { align-items: flex-start; flex-direction: column; gap: 28px; }
  .guide-group-heading { grid-template-columns: 1fr; gap: 0; }
  .guide-group-heading > p:last-child { grid-column: 1; grid-row: auto; margin-top: 20px; }
  .guide-nav { gap: 18px; }
  .guide-table-hint { display: block; margin-bottom: 14px; color: var(--color-text-muted); font-size: var(--text-sm); }
  .site-footer, .guide-footer { grid-template-columns: auto 1fr; gap: 24px; }
  .site-footer > :last-child, .guide-footer > :last-child { grid-column: 2; justify-self: start; }
}
@media (max-width: 600px) {
  html { scroll-padding-top: 84px; }
  .site-header, .guide-header { min-height: 76px; gap: 16px; }
  .brand-wordmark { width: 88px; }
  .guide-header { flex-wrap: wrap; padding-block: 16px; }
  .guide-nav { width: 100%; gap: 20px; flex-wrap: wrap; justify-content: space-between; }
  .guide-nav .button { min-height: 42px; padding: 10px 14px; font-size: .78rem; }
  .hero { padding-top: 40px; }
  .hero h1 { max-width: 13ch; font-size: clamp(2.7rem, 10.5vw, 3.5rem); }
  .hero-lede { font-size: 1.03rem; }
  .hero-art-caption { gap: 12px; font-size: .72rem; }
  .hero-actions { align-items: stretch; }
  .hero-actions .button { flex: 0 1 auto; white-space: nowrap; }
  .process-grid, .sync-sequence, .continuation-grid, .guide-steps, .guide-checklist, .guide-card-grid, .related-guides ul, .artifact-record, .approach-summary { grid-template-columns: 1fr; }
  .process-grid, .sync-sequence, .continuation-grid { gap: 32px; }
  .process-grid li > span, .sequence-number { margin-bottom: 18px; }
  .scenario-lab { padding: 22px; }
  .scenario-tabs { gap: 8px; margin-bottom: 28px; }
  .scenario-tabs button { flex: 1 1 100%; }
  .integration-examples > li { padding: 22px 16px; }
  .integration-examples strong { font-size: .98rem; }
  .integration-examples p { font-size: .82rem; }
  .request-form { padding: 24px; }
  .form-submit { flex-direction: column; }
  .form-submit .button { width: 100%; }
  .form-submit p { flex-basis: auto; }
  .guide-hero h1, .guide-index-hero h1, .approach-hero h1 { font-size: clamp(2.1rem, 8.4vw, 3rem); }
  .guide-dek, .guide-index-hero > p:last-child { font-size: 1.03rem; }
  .guide-answer, .guide-not-needed { padding: 24px; }
  .guide-answer p:last-child { font-size: 1rem; }
  .guide-section { padding-block: 36px; }
  .artifact-record > div:nth-child(odd) { border-right: 0; }
  .coverage-table th, .coverage-table td { padding: 12px; }
  .approach-example .coverage-table { min-width: 580px; }
  .site-footer, .guide-footer { grid-template-columns: 1fr; gap: 24px; }
  .site-footer > :last-child, .guide-footer > :last-child { grid-column: 1; }
}
html:not(.js) .nav-toggle { display: none; }
html:not(.js) .site-header { position: relative; flex-wrap: wrap; padding-block: 16px; }
html:not(.js) .site-nav { position: static; display: flex; flex-direction: row; flex-wrap: wrap; width: 100%; padding: 0; border: 0; box-shadow: none; gap: 12px 22px; }
html:not(.js) .site-nav > a { border: 0; }
html:not(.js) .site-nav .nav-cta { margin: 0; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { scroll-behavior: auto !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
}

/* Print retains the same hierarchy at brief scale. */
@page { size: Letter; margin: 0; }
@media print {
  html { scroll-padding-top: 0; }
  body { background: white; color: var(--color-text); print-color-adjust: exact; -webkit-print-color-adjust: exact; }
  .site-header, .site-footer, .hero-actions, .contact, .skip-link, .guide-nav, .scenario-tabs, .guide-toc { display: none; }
  .section-frame { width: auto; max-width: none; }
  .section-pad { padding-block: 20px; }
  .scenario-panel[hidden] { display: block !important; margin-top: 20px; }
  .guide-article-layout { display: block; }
  .guide-section, .guide-not-needed, .guide-artifact { break-inside: avoid; }
  .approach-page { font-size: 9pt; line-height: 1.4; }
  .approach-page .approach-download, .approach-page .approach-cta, .approach-page .approach-summary { display: none; }
  .approach-page .guide-header, .approach-page .approach-main, .approach-page .guide-footer { width: auto; max-width: none; padding-inline: .45in; border: 0; }
  .approach-page .guide-header { height: .6in; min-height: 0; padding-top: .1in; padding-bottom: 0; }
  .approach-hero { padding: .08in 0 .1in; }
  .approach-hero h1 { max-width: 6.9in; margin-bottom: .07in; font-size: 23pt; }
  .approach-hero .guide-dek { max-width: none; font-size: 10pt; line-height: 1.4; margin: 0 0 .08in; }
  .approach-page .eyebrow { margin-bottom: .04in; font-size: 7pt; }
  .approach-status { margin: 0; font-size: 8pt; }
  .approach-summary { grid-template-columns: repeat(3, 1fr); gap: .12in; margin-top: .08in; padding-top: .06in; }
  .approach-summary dt { margin-bottom: .025in; font-size: 6.8pt; }
  .approach-summary dd { font-size: 7pt; line-height: 1.35; }
  .approach-section { padding: .065in 0; break-inside: avoid; }
  .approach-section h2 { max-width: none; font-size: 13pt; margin-bottom: .06in; }
  .approach-section p { margin: 0 0 .055in; font-size: 8.2pt; line-height: 1.35; }
  .approach-section > p:not(.eyebrow), .approach-steps, .approach-status { max-width: none; }
  .approach-steps { margin: .05in 0; gap: .045in; font-size: 8.2pt; line-height: 1.35; }
  .coverage-table { min-width: 0 !important; font-size: 7.5pt; }
  .coverage-table caption { padding-bottom: .05in; font-size: 7pt; }
  .coverage-table th, .coverage-table td { padding: .055in .075in; font-size: 7.5pt; }
  .approach-page .guide-footer { display: grid; grid-template-columns: auto 1fr auto; min-height: 0; padding-block: .08in; gap: 16px; font-size: 7pt; }
  .approach-page .guide-footer p, .approach-page .guide-footer a { font-size: 7pt; }
  .approach-page .guide-footer > :last-child { grid-column: auto; }
  .approach-page .guide-footer .brand-wordmark { width: .7in; height: auto; }
}