@font-face {
  font-family: "Helvetica Now Display";
  src: url("/assets/HelveticaNowDisplay-Light.otf") format("opentype");
  font-weight: 300;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Helvetica Now Display";
  src: url("/assets/HelveticaNowDisplay-Bold.otf") format("opentype");
  font-weight: 700;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Helvetica Now Display";
  src: url("/assets/HelveticaNowDisplay-Black.otf") format("opentype");
  font-weight: 900;
  font-style: normal;
  font-display: swap;
}

:root {
  --ink: #1c1c1b;
  --charcoal: #262623;
  --ivory: #f4f0ed;
  --paper: #fbfaf8;
  --cognac: #a8673b;
  --cognac-dark: #7d4928;
  --muted: #686660;
  --line-dark: rgba(244, 240, 237, 0.18);
  --line-light: rgba(28, 28, 27, 0.17);
  --sans: "Helvetica Now Display", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --header-height: 78px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.58;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; }
img { display: block; max-width: 100%; }
h1, h2, h3, p { margin-top: 0; }
h1, h2, h3 { letter-spacing: -0.035em; line-height: 0.98; }
h1 { max-width: 1120px; margin-bottom: 2rem; font-size: clamp(3.1rem, 6.5vw, 7rem); font-weight: 900; }
h2 { max-width: 1000px; font-size: clamp(2.35rem, 4.7vw, 5rem); font-weight: 900; }
h3 { font-size: clamp(1.55rem, 2.4vw, 2.5rem); font-weight: 700; }
.section-dark { background: var(--ink); color: var(--ivory); }
.section-ivory { background: var(--ivory); color: var(--ink); }
.section-paper { background: var(--paper); color: var(--ink); }
.section-cognac { background: var(--cognac); color: var(--ivory); }
.anchored { scroll-margin-top: 148px; }
.eyebrow, .review-date {
  margin-bottom: 1.6rem;
  color: var(--cognac-dark);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}
.section-dark .eyebrow { color: var(--cognac); }
.section-cognac .eyebrow { color: var(--ink); }
.skip-link {
  position: fixed;
  z-index: 100;
  top: 0.5rem;
  left: 0.5rem;
  padding: 0.75rem 1rem;
  transform: translateY(-160%);
  background: var(--paper);
  color: var(--ink);
  font-weight: 700;
}
.skip-link:focus { transform: translateY(0); }
a:focus-visible, summary:focus-visible { outline: 3px solid var(--cognac); outline-offset: 4px; }

.site-header {
  position: sticky;
  z-index: 30;
  top: 0;
  display: grid;
  grid-template-columns: 120px 1fr auto;
  align-items: center;
  min-height: var(--header-height);
  padding: 0 4vw;
  border-bottom: 1px solid rgba(244, 240, 237, 0.12);
  background: rgba(28, 28, 27, 0.97);
  color: var(--ivory);
  backdrop-filter: blur(14px);
}
.brand { display: flex; align-items: center; justify-content: center; width: 72px; height: 48px; overflow: hidden; }
.brand img { width: 62px; object-fit: contain; filter: invert(93%) sepia(8%) saturate(165%) hue-rotate(321deg) brightness(108%) contrast(91%); mix-blend-mode: screen; }
.staging-label { margin: 0; color: rgba(244,240,237,.58); font-size: .75rem; font-weight: 700; letter-spacing: .12em; text-align: center; text-transform: uppercase; }
.header-link { min-height: 44px; display: inline-flex; align-items: center; color: var(--ivory); font-size: .75rem; font-weight: 700; letter-spacing: .06em; text-decoration: none; text-transform: uppercase; }

.resource-masthead, .exposure, .plain-english, .comparisons, .campaign, .questions, .workflow, .requirements, .help, .sources, .invitation { padding: 7.5rem 5vw; }
.resource-masthead { padding-top: 6rem; border-bottom: 7px solid var(--cognac); }
.masthead-meta { display: flex; justify-content: space-between; gap: 2rem; }
.masthead-meta .review-date { color: var(--muted); text-align: right; }
.masthead-deck { max-width: 68ch; font-size: clamp(1.2rem, 1.7vw, 1.55rem); line-height: 1.48; }
.tldr { max-width: 980px; margin-top: 3.5rem; padding: 2.4rem 2.6rem; border-top: 1px solid var(--cognac); border-bottom: 1px solid var(--line-light); background: var(--paper); }
.tldr-label { margin-bottom: .85rem; color: var(--cognac-dark); font-size: .78rem; font-weight: 700; letter-spacing: .13em; text-transform: uppercase; }
.tldr p:last-child { margin: 0; font-size: 1.2rem; line-height: 1.45; }
.tldr-grid { display: grid; grid-template-columns: .75fr .9fr 1.35fr; gap: 2.2rem; }
.tldr-grid p { margin: 0; font-size: 1.08rem; line-height: 1.5; }
.tldr-grid strong { display: block; margin-bottom: .5rem; color: var(--ink); }
.scope-line { max-width: 68ch; margin: 1.5rem 0 0; }

.jump-nav {
  position: sticky;
  z-index: 20;
  top: var(--header-height);
  display: flex;
  align-items: center;
  gap: 2rem;
  padding: .65rem 5vw;
  border-bottom: 1px solid var(--line-light);
  background: rgba(251,250,248,.98);
}
.jump-nav > span { flex: 0 0 auto; font-size: .72rem; font-weight: 900; letter-spacing: .1em; text-transform: uppercase; }
.jump-links { display: flex; gap: .35rem; overflow-x: auto; scrollbar-width: thin; }
.jump-links a { display: inline-flex; align-items: center; min-height: 44px; padding: 0 .75rem; color: var(--muted); font-size: .77rem; font-weight: 700; white-space: nowrap; text-decoration: none; text-transform: uppercase; }
.jump-links a:hover { color: var(--cognac-dark); }

.exposure, .help { display: grid; grid-template-columns: .8fr 1.2fr; gap: 7vw; }
.plain-english { display: block; }
.section-kicker h2 { max-width: 650px; }
.exposure-lead { max-width: 42ch; margin-bottom: 1.4rem; font-size: 1.12rem; }
.prose-column { max-width: 68ch; }
.prose-column .lead { font-size: clamp(1.9rem, 3vw, 3rem); font-weight: 300; line-height: 1.2; }
.copy-stack p:not(.lead) { font-size: 1.08rem; }
.section-heading > p:last-child { max-width: 68ch; }
.compact-heading { display: grid; grid-template-columns: .55fr 1fr; gap: 4vw; align-items: start; }
.compact-heading h2 { max-width: 900px; }
.definition-intro { max-width: 68ch; margin: 2.5rem 0 0 auto; }
.definition-list { margin-top: 4.5rem; border-top: 1px solid var(--line-light); }
.definition-list article { display: grid; grid-template-columns: .7fr 1.3fr; gap: 5vw; padding: 2rem 0 2.4rem; border-bottom: 1px solid var(--line-light); }
.definition-list h3, .definition-list p { margin: 0; }
.definition-list p { max-width: 68ch; }

.comparison-list { margin-top: 4rem; border-top: 1px solid var(--line-light); }
.comparison-row { display: grid; grid-template-columns: 1fr 1fr; border-bottom: 1px solid var(--line-light); }
.comparison-row > div { min-height: 190px; padding: 2rem 3vw 2.4rem 0; }
.comparison-row > div + div { padding-left: 3vw; border-left: 1px solid var(--line-light); }
.comparison-row span { display: block; margin-bottom: 2.2rem; color: var(--cognac-dark); font-size: .78rem; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; }
.comparison-row p { max-width: 44ch; margin: 0; font-size: 1.15rem; }

.campaign-intro { display: grid; grid-template-columns: .45fr 1fr; gap: 4vw; }
.campaign-intro .eyebrow { grid-column: 1; }
.campaign-intro h2 { grid-column: 1 / -1; }
.campaign-intro > p:last-child { grid-column: 2; max-width: 60ch; }
.campaign-route { display: grid; grid-template-columns: repeat(5, 1fr); margin: 5rem 0 0; padding: 0; border-top: 1px solid var(--line-dark); list-style: none; }
.campaign-route li { position: relative; min-height: 350px; padding: 2rem 2rem 3rem 0; border-bottom: 1px solid var(--line-dark); }
.campaign-route li + li { padding-left: 2rem; border-left: 1px solid var(--line-dark); }
.campaign-route li:not(:last-child)::after { content: ""; position: absolute; z-index: 2; top: -5px; right: -5px; width: 9px; height: 9px; background: var(--cognac); transform: rotate(45deg); }
.campaign-route span { color: var(--cognac); font-size: .78rem; font-weight: 900; }
.campaign-route h3 { margin-top: 4.5rem; }
.campaign-consequence { display: grid; grid-template-columns: 1fr 1fr; gap: 5vw; margin-top: 4rem; padding-top: 3rem; border-top: 1px solid var(--line-dark); }
.campaign-consequence p { max-width: 65ch; color: rgba(244,240,237,.75); }
.campaign-consequence strong { color: var(--ivory); }

.question-list { margin: 4rem 0 0; padding: 0; border-top: 1px solid var(--line-light); list-style: none; }
.question-list li { display: grid; grid-template-columns: 70px 1fr; gap: 2rem; padding: 2rem 0; border-bottom: 1px solid var(--line-light); }
.question-list span { color: var(--cognac-dark); font-size: .78rem; font-weight: 900; }
.question-list p { max-width: 46ch; margin: 0; font-size: clamp(1.45rem, 2.5vw, 2.5rem); font-weight: 700; line-height: 1.1; }
.decision-flow { display: grid; grid-template-columns: repeat(4, 1fr); margin-top: 5rem; border-top: 1px solid var(--ink); border-bottom: 1px solid var(--ink); }
.decision-flow div { position: relative; min-height: 150px; padding: 1.6rem 1.6rem 2rem 0; }
.decision-flow div + div { padding-left: 1.6rem; border-left: 1px solid var(--line-light); }
.decision-flow span { color: var(--cognac-dark); font-size: .75rem; font-weight: 900; }
.decision-flow p { margin: 2rem 0 0; font-size: 1.25rem; font-weight: 700; line-height: 1.15; }
.ownership-note { max-width: 68ch; margin: 1.5rem 0 0; }

.action-rows { margin: 4rem 0 0; padding: 0; border-top: 1px solid var(--line-light); list-style: none; }
.action-rows > li { display: grid; grid-template-columns: 70px .8fr 1.2fr; gap: 2rem; padding: 2.2rem 0; border-bottom: 1px solid var(--line-light); }
.action-rows span { color: var(--cognac-dark); font-size: .78rem; font-weight: 900; }
.action-rows h3, .action-rows p { margin: 0; }
.action-rows p { max-width: 52ch; }
.workflow-note { max-width: 68ch; margin: 3rem 0 0 auto; font-size: 1.14rem; }

.requirements { border-top: 1px solid var(--line-light); }
.requirements-intro { display: grid; grid-template-columns: 1.1fr .9fr; gap: 7vw; }
.reference-note { max-width: 58ch; padding-top: 3.2rem; }
.requirement-list { margin-top: 4rem; border-top: 1px solid var(--ink); }
.requirement-group { margin-top: 5.5rem; }
.requirement-group > h3 { max-width: 800px; }
.requirement-list details { border-bottom: 1px solid var(--line-light); }
.requirement-list summary { display: grid; grid-template-columns: .7fr 1.3fr 44px; gap: 2rem; align-items: center; min-height: 108px; padding: 1.25rem 0; cursor: pointer; list-style: none; }
.requirement-list summary::-webkit-details-marker { display: none; }
.requirement-list summary::after { content: "+"; justify-self: end; color: var(--cognac-dark); font-size: 2rem; font-weight: 300; }
.requirement-list details[open] summary::after { content: "−"; }
.requirement-list summary span { color: var(--cognac-dark); font-size: .78rem; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; }
.requirement-list summary strong { font-size: 1.2rem; line-height: 1.25; }
.detail-body { max-width: 74ch; padding: 0 0 2.5rem calc(35% + 1rem); }
.guidance-copy { display: grid; grid-template-columns: 1fr 1fr; gap: 5vw; margin-top: 2.5rem; padding-top: 2rem; border-top: 1px solid var(--line-light); }
.guidance-copy p { max-width: 62ch; }

.help { grid-template-columns: .9fr 1.1fr; }
.help-intro p:not(.eyebrow) { max-width: 62ch; }
.help-options { border-top: 1px solid var(--line-light); }
.options-label { padding: 1.5rem 0; color: var(--cognac-dark); font-size: .78rem; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; }
.help-options article { padding: 2rem 0; border-top: 1px solid var(--line-light); }
.help-options article:last-child { border-bottom: 1px solid var(--line-light); }
.help-options h3 { margin-bottom: 1rem; }
.help-options article p { max-width: 56ch; margin: 0; }
.help-boundary { grid-column: 1 / -1; display: grid; grid-template-columns: 1fr 1fr; gap: 5vw; margin-top: 4rem; padding: 2.5rem; border-left: 5px solid var(--cognac); background: var(--ivory); }
.help-boundary p { max-width: 62ch; margin: 0; }

.source-group { margin-top: 4.5rem; }
.source-group h3 { font-size: 1.2rem; letter-spacing: 0; }
.source-list { margin: 1.5rem 0 0; padding: 0; border-top: 1px solid var(--line-light); list-style: none; }
.source-list li { padding: 1.15rem 0; border-bottom: 1px solid var(--line-light); }
.source-list a { display: flex; justify-content: space-between; gap: 2rem; min-height: 44px; align-items: center; color: var(--ink); font-weight: 700; text-decoration-thickness: 1px; text-underline-offset: .2em; }
.source-list a:hover { color: var(--cognac-dark); }

.invitation h2 { max-width: 1000px; color: var(--ink); }
.invitation > p:not(.eyebrow) { max-width: 68ch; font-size: 1.2rem; }
.invitation-actions { display: flex; align-items: center; gap: 2rem; margin-top: 1.5rem; }
.text-link { font-size: .78rem; font-weight: 700; letter-spacing: .05em; text-decoration: none; text-transform: uppercase; }
.button { display: inline-flex; align-items: center; justify-content: center; min-height: 52px; margin-top: 1.5rem; padding: .9rem 1.35rem; border: 1px solid var(--ink); background: var(--ink); color: var(--ivory); font-size: .78rem; font-weight: 700; letter-spacing: .05em; text-decoration: none; text-transform: uppercase; }
.button:hover { background: var(--charcoal); }

footer { display: grid; grid-template-columns: 1fr auto; gap: 2rem; padding: 3rem 5vw; background: var(--ink); color: var(--ivory); }
.footer-brand { display: flex; align-items: center; gap: 1.5rem; }
.footer-brand img { width: 55px; padding: 5px; background: var(--ivory); object-fit: contain; }
.footer-brand p { margin: 0; font-size: .82rem; font-weight: 700; letter-spacing: .05em; text-transform: uppercase; }
.footer-brand span { color: rgba(244,240,237,.48); font-weight: 400; }
.footer-links { display: flex; gap: 1.5rem; align-items: center; }
.footer-links a { color: rgba(244,240,237,.72); font-size: .78rem; text-decoration: none; }
.prototype-note { grid-column: 1 / -1; margin: 2rem 0 0; padding-top: 1.2rem; border-top: 1px solid var(--line-dark); color: rgba(244,240,237,.45); font-size: .72rem; }

@media (max-width: 920px) {
  .exposure, .help, .requirements-intro { grid-template-columns: 1fr; }
  .compact-heading { grid-template-columns: 1fr; }
  .definition-list article { grid-template-columns: 1fr; gap: 1rem; }
  .tldr-grid { grid-template-columns: 1fr; }
  .campaign-intro { grid-template-columns: 1fr; }
  .campaign-intro .eyebrow, .campaign-intro h2, .campaign-intro > p:last-child { grid-column: 1; }
  .campaign-route { grid-template-columns: 1fr 1fr; }
  .campaign-route li:nth-child(3) { border-left: 0; }
  .action-rows > li { grid-template-columns: 50px 1fr; }
  .action-rows p { grid-column: 2; }
  .campaign-consequence, .guidance-copy { grid-template-columns: 1fr; }
  .reference-note { padding-top: 0; }
}

@media (max-width: 620px) {
  :root { --header-height: 68px; }
  body { font-size: 16px; }
  .site-header { grid-template-columns: 72px 1fr; padding: 0 1.2rem; }
  .staging-label { text-align: right; }
  .header-link { display: none; }
  .resource-masthead, .exposure, .plain-english, .comparisons, .campaign, .questions, .workflow, .requirements, .help, .sources, .invitation { padding: 4.75rem 1.3rem; }
  .resource-masthead { padding-top: 4rem; }
  .masthead-meta { display: block; }
  .masthead-meta .review-date { text-align: left; }
  .tldr { margin-top: 2.5rem; padding: 1.5rem 1.25rem; }
  .jump-nav { position: static; display: block; padding: .6rem 1.3rem .75rem; }
  .jump-nav > span { display: block; margin: .35rem 0; }
  .jump-links { margin-right: -1.3rem; padding-right: 1.3rem; }
  .anchored { scroll-margin-top: 84px; }
  .comparison-row { grid-template-columns: 1fr; }
  .comparison-row > div { min-height: 0; padding: 1.5rem 0 1.75rem; }
  .comparison-row > div + div { padding-left: 0; border-top: 1px dashed var(--line-light); border-left: 0; }
  .comparison-row span { margin-bottom: .8rem; }
  .campaign-route { grid-template-columns: 1fr; border-left: 1px solid var(--line-dark); border-top: 0; }
  .campaign-route li, .campaign-route li + li { min-height: 0; padding: 1.75rem 0 2rem 1.5rem; border-left: 0; }
  .campaign-route li:not(:last-child)::after { top: auto; right: auto; bottom: -5px; left: -5px; }
  .campaign-route h3 { margin-top: 2rem; }
  .question-list li { grid-template-columns: 38px 1fr; gap: 1rem; }
  .decision-flow { grid-template-columns: 1fr; border-left: 1px solid var(--ink); border-top: 0; }
  .decision-flow div, .decision-flow div + div { min-height: 0; padding: 1.25rem 0 1.5rem 1.25rem; border-left: 0; border-bottom: 1px solid var(--line-light); }
  .decision-flow p { margin-top: .6rem; }
  .action-rows > li { grid-template-columns: 36px 1fr; gap: 1rem; }
  .requirement-list summary { grid-template-columns: 1fr 40px; gap: 1rem; padding: 1.2rem 0; }
  .requirement-list summary span { grid-column: 1; }
  .requirement-list summary strong { grid-column: 1; }
  .requirement-list summary::after { grid-column: 2; grid-row: 1 / 3; }
  .detail-body { padding-left: 0; }
  .help-boundary { grid-template-columns: 1fr; padding: 1.5rem; }
  .invitation-actions { align-items: flex-start; flex-direction: column; }
  footer { grid-template-columns: 1fr; padding: 3rem 1.3rem; }
  .footer-links { align-items: flex-start; flex-direction: column; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

:root { --v4-charcoal: #262623; }
.v4-opening { min-height: calc(100vh - var(--header-height)); padding: 6rem 5vw 5rem; background: var(--v4-charcoal); color: var(--ivory); border-bottom: 7px solid var(--cognac); }
.opening-meta { display: flex; justify-content: space-between; gap: 2rem; color: rgba(244,240,237,.62); font-size: .8rem; font-weight: 700; letter-spacing: .1em; text-transform: uppercase; }
.opening-meta .eyebrow { color: var(--cognac); }
.v4-opening h1 { max-width: 1180px; margin-top: 2.5rem; color: var(--ivory); }
.v4-opening h1 { font-size: clamp(3.2rem,5.6vw,4.5rem); }
.opening-deck { max-width: 50ch; color: var(--ivory); font-size: clamp(1.35rem,2vw,1.85rem); font-weight: 300; line-height: 1.35; }
.opening-situation { max-width: 68ch; margin-top: 3rem; color: rgba(244,240,237,.78); font-size: clamp(1.12rem,1.5vw,1.4rem); }
.orientation { display: grid; grid-template-columns: .65fr 1.35fr; gap: 5vw; max-width: 1180px; margin-top: 3.5rem; padding-top: 2rem; border-top: 1px solid var(--line-dark); }
.orientation > p { font-size: 1.15rem; }
.orientation ul { display: grid; grid-template-columns: 1fr 1fr; gap: 0 3rem; margin: 0; padding: 0; list-style: none; }
.orientation li { padding: .75rem 0 .75rem 1.2rem; border-bottom: 1px solid var(--line-dark); position: relative; }
.orientation li::before { content: ""; position: absolute; top: 1.35rem; left: 0; width: 6px; height: 6px; background: var(--cognac); transform: rotate(45deg); }
.opening-scope { max-width: 74ch; margin: 2.5rem 0 0; color: rgba(244,240,237,.58); }
.reader-nav { display: grid; grid-template-columns: 190px 1fr; align-items: center; margin-top: 3rem; padding: .65rem 0; border-top: 1px solid var(--line-dark); border-bottom: 1px solid var(--line-dark); color: var(--ivory); }
.reader-nav > span { color: var(--ivory); font-size: .74rem; font-weight: 900; letter-spacing: .08em; text-transform: uppercase; }
.reader-nav div { display: flex; gap: .2rem; overflow-x: auto; }
.reader-nav a { display: inline-flex; align-items: center; min-height: 44px; padding: 0 .65rem; color: rgba(244,240,237,.7); font-size: .75rem; font-weight: 700; text-decoration: none; text-transform: uppercase; white-space: nowrap; }
.reader-nav a:hover { color: var(--ivory); }
.campaign,.why-now,.distinctions,.workflow,.requirements,.contribution,.sources,.invitation { padding: 7.5rem 5vw; }
.campaign { background: var(--paper); }
.campaign-lead { max-width: 64ch; margin-top: 3rem; font-size: clamp(1.2rem,1.7vw,1.45rem); line-height: 1.45; }
.questions-lead { margin: 3rem 0 0; font-size: 1.15rem; font-weight: 700; }
.campaign-questions { margin: 4rem 0 0; padding: 0; border-top: 1px solid var(--line-light); list-style: none; }
.campaign-questions li { display: grid; grid-template-columns: 70px 1fr; gap: 2rem; padding: 1.9rem 0; border-bottom: 1px solid var(--line-light); }
.campaign-questions span { color: var(--cognac-dark); font-size: .78rem; font-weight: 900; }
.campaign-questions h3 { max-width: 800px; margin: 0; }
.campaign-answer { max-width: 68ch; margin: 2.5rem 0 0 auto; font-size: 1.16rem; }
.campaign-detail { display: grid; grid-template-columns: 1fr 1fr; gap: 6vw; margin-top: 5rem; padding-top: 3rem; border-top: 1px solid var(--line-light); }
.campaign-detail > p,.proof-point { max-width: 62ch; }
.proof-point { padding-left: 1.5rem; border-left: 4px solid var(--cognac); }
.why-intro { display: grid; grid-template-columns: .8fr 1.2fr; gap: 6vw; }
.why-intro .eyebrow,.why-intro h2 { grid-column: 1; }
.why-intro > div { grid-column: 2; grid-row: 1 / 3; max-width: 68ch; }
.requirement-sources { margin: 5rem 0 0; padding: 0; border-top: 1px solid var(--line-light); list-style: none; }
.requirement-sources li { padding: 1.35rem 0; border-bottom: 1px solid var(--line-light); font-size: clamp(1.15rem,1.8vw,1.55rem); }
.stakes { display: grid; grid-template-columns: .8fr 1.2fr; gap: 7vw; margin-top: 5rem; }
.stakes ul { padding-left: 1.1rem; }
.stakes li { margin-bottom: .65rem; }
.publisher-question { margin-top: 2rem; font-size: clamp(1.45rem,2.3vw,2.4rem); font-weight: 300; line-height: 1.15; }
.distinction-boundary { max-width: 72ch; margin: 4rem 0 0 auto; padding: 2rem; border-left: 5px solid var(--cognac); background: var(--ivory); }
.requirements-intro { align-items: start; }
.requirements-intro > div:last-child { max-width: 60ch; padding-top: 2.5rem; }
.requirements .requirement-list details > div { max-width: 74ch; padding: 0 0 2.5rem calc(35% + 1rem); }
.guidance { margin-top: 5rem; }
.guidance > div { display: grid; grid-template-columns: 1fr 1fr; gap: 5vw; margin-top: 2rem; padding-top: 2rem; border-top: 1px solid var(--line-light); }
.contribution { display: grid; grid-template-columns: .85fr 1.15fr; gap: 7vw; }
.contribution-lead { max-width: 34ch; font-size: clamp(1.55rem,2.6vw,2.7rem); font-weight: 300; line-height: 1.2; }
.contribution-copy { max-width: 68ch; }
.intended-result { margin-top: 2.5rem; font-size: 1.3rem; font-weight: 700; }
.invitation { background: var(--cognac); }
.invitation > p { max-width: 68ch; font-size: clamp(1.55rem,2.7vw,2.8rem); line-height: 1.16; }
.invitation > div { display: flex; align-items: center; gap: 2rem; }
.source-group { margin-top: 4.5rem; }
.source-group h3 { font-size: 1.2rem; letter-spacing: 0; }
.source-group ul { margin: 1.5rem 0 0; padding: 0; border-top: 1px solid var(--line-light); list-style: none; }
.source-group li { border-bottom: 1px solid var(--line-light); }
.source-group a { display: flex; justify-content: space-between; gap: 2rem; min-height: 56px; align-items: center; font-weight: 700; text-underline-offset: .2em; }

@media (max-width: 920px) {
  .orientation,.why-intro,.stakes,.campaign-detail,.contribution { grid-template-columns: 1fr; }
  .why-intro .eyebrow,.why-intro h2,.why-intro > div { grid-column: 1; grid-row: auto; }
  .reader-nav { grid-template-columns: 1fr; }
  .reader-nav > span { padding-top: .4rem; }
  .guidance > div { grid-template-columns: 1fr; }
}
@media (max-width: 620px) {
  .v4-opening { padding: 3rem 1.3rem 4rem; }
  .campaign,.why-now,.distinctions,.workflow,.requirements,.contribution,.sources,.invitation { padding: 4.75rem 1.3rem; }
  .opening-meta { display: block; }
  .v4-opening h1 { margin-top: 1.75rem; font-size: 2.75rem; line-height: .96; }
  .opening-deck { font-size: 1.18rem; }
  .opening-situation { margin-top: 1.75rem; font-size: 1rem; }
  .orientation { margin-top: 2.25rem; }
  .orientation ul { grid-template-columns: 1fr; }
  .reader-nav { margin-top: 2rem; padding: .7rem 0; }
  .reader-nav div { display: grid; grid-template-columns: 1fr 1fr; overflow: visible; }
  .reader-nav a { padding: 0; }
  .campaign-questions li { grid-template-columns: 36px 1fr; gap: 1rem; }
  .requirements .requirement-list details > div { padding-left: 0; }
  .invitation > div { align-items: flex-start; flex-direction: column; }
}

.v5-opening { min-height: auto; padding-top: 4.5rem; padding-bottom: 3.2rem; }
.v5-opening .opening-meta { display: block; }
.v5-opening h1 { max-width: 1180px; }
.v5-opening h1 > span { display: block; }
.opening-tldr { max-width: 66ch; margin: 2rem 0 0; color: rgba(244,240,237,.84); font-size: clamp(1.125rem,1.3vw,1.1875rem); line-height: 1.55; }
.opening-tldr p { margin: .9rem 0 0; }
.opening-tldr .tldr-label { margin: 0; color: var(--ivory); font-weight: 800; }
.v5-opening .reader-nav { margin-top: 2.25rem; }
.v5-opening .reader-nav div { display: grid; grid-template-columns: repeat(6,minmax(0,1fr)); gap: .15rem; overflow: visible; }
.v5-opening .reader-nav a { padding: .45rem .55rem; white-space: normal; line-height: 1.25; }
.guide-covers,.why-now,.campaign,.requirements,.contribution,.sources { padding-top: 6rem; padding-bottom: 6rem; }
.distinctions { padding-top: 6rem; padding-bottom: 4.5rem; }
.workflow { padding-top: 4.5rem; padding-bottom: 6rem; }
.invitation { padding-top: 5rem; padding-bottom: 5rem; }
.learning-lead { margin-top: 2.5rem; font-weight: 700; }
.learning-list,.contribution-list { margin: 1.5rem 0 0; padding: 0; border-top: 1px solid var(--line-light); list-style: none; }
.learning-list { display: grid; grid-template-columns: 1fr 1fr; gap: 0 3rem; }
.learning-list li,.contribution-list li { position: relative; padding: 1.25rem 0 1.25rem 1.2rem; border-bottom: 1px solid var(--line-light); }
.learning-list li::before,.contribution-list li::before { content: ""; position: absolute; top: 1.8rem; left: 0; width: 6px; height: 6px; background: var(--cognac); transform: rotate(45deg); }
.iab-reference { max-width: 74ch; margin-top: 3rem; }
.iab-reference a { font-weight: 800; text-underline-offset: .2em; }
.selective-scope { max-width: 74ch; margin-top: 2.5rem; }
.guide-covers > :last-child { margin-bottom: 0; }
.requirements-lead { margin: 3rem 0 0; font-weight: 700; }
.requirement-sources { margin-top: 3rem; }
.why-now .stakes { grid-template-columns: minmax(0,1fr); max-width: 72ch; }
.stakes { margin-top: 4rem; }
.campaign-answer { max-width: 74ch; }
.campaign-questions { margin-top: 3rem; }
.tiktok-example { display: grid; grid-template-columns: 1fr 1fr; gap: 5vw; margin-top: 3rem; padding: 2.25rem; border-left: 5px solid var(--cognac); background: var(--ivory); }
.tiktok-example p { margin: 0; }
.campaign .publisher-question { max-width: 64ch; margin: 3rem 0 0; text-align: left; }
.definition-list { margin-top: 3.5rem; }
.distinction-boundary { max-width: 72ch; margin: 3rem 0 0; text-align: left; }
.action-rows { margin-top: 3rem; }
.definition-list article p::first-letter { text-transform: uppercase; }
.requirements-intro > div:last-child { padding-top: 0; }
.requirement-group { margin-top: 4rem; }
.guidance { margin-top: 4rem; padding-top: 2.5rem; border-top: 2px solid var(--cognac); }
.contribution-list { margin: 1.5rem 0 2.5rem; }
.source-group { margin-top: 3.5rem; }
.context-source { display: inline-block; margin-top: 1rem; color: var(--cognac-dark); font-size: 1rem; font-weight: 700; line-height: 1.4; text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: .22em; }
.context-source:hover { color: var(--ink); }
.context-source:focus-visible { outline: 3px solid var(--cognac); outline-offset: 4px; }

@media (max-width: 1120px) {
  .v5-opening .reader-nav { grid-template-columns: 170px 1fr; }
  .v5-opening .reader-nav div { grid-template-columns: repeat(3,minmax(0,1fr)); }
}
@media (max-width: 920px) {
  .v5-opening .reader-nav { grid-template-columns: 1fr; }
  .tiktok-example { grid-template-columns: 1fr; }
}
@media (max-width: 620px) {
  .v5-opening { padding-top: 2.25rem; padding-bottom: 3rem; }
  .v5-opening h1 { font-size: 2.25rem; line-height: .98; letter-spacing: -.035em; }
  .v5-opening h1 > span { display: inline; }
  .opening-deck { margin-top: 1.55rem; }
  .opening-tldr { margin-top: 1.5rem; font-size: 1.0625rem; line-height: 1.55; }
  .v5-opening .reader-nav { margin-top: 1.6rem; }
  .v5-opening .reader-nav div { grid-template-columns: 1fr 1fr; }
  .v5-opening .reader-nav a { min-height: 52px; padding: .4rem .35rem 0 0; }
  .guide-covers,.why-now,.campaign,.requirements,.contribution,.sources,.invitation { padding-top: 4rem; padding-bottom: 4rem; }
  .distinctions { padding-top: 4rem; padding-bottom: 3rem; }
  .workflow { padding-top: 3rem; padding-bottom: 4rem; }
  .requirement-group,.guidance { margin-top: 3.25rem; }
  .learning-list { grid-template-columns: 1fr; }
  .tiktok-example { padding: 1.5rem; }
  .campaign .publisher-question { margin-left: 0; }
  .context-source { display: inline-flex; align-items: center; min-height: 44px; margin-top: .65rem; }
}