:root {
  --ink: #10151a;
  --paper: #f3f1e9;
  --lime: #d9ff43;
  --blue: #456cff;
  --muted: #62686c;
  --line: rgba(16, 21, 26, 0.2);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--paper); color: var(--ink); font-family: Arial, Helvetica, sans-serif; font-size: 16px; line-height: 1.55; }
a { color: inherit; }
.skip-link { position: absolute; top: 0.5rem; left: 0.5rem; transform: translateY(-150%); background: var(--ink); color: white; padding: 0.8rem 1rem; z-index: 10; }
.skip-link:focus { transform: translateY(0); }
:focus-visible { outline: 3px solid var(--blue); outline-offset: 5px; }
[id] { scroll-margin-top: 6rem; }
.breadcrumbs { display: block; margin-bottom: 3rem; font-size: 0.8rem; }
.breadcrumbs ol { display: flex; flex-wrap: wrap; gap: 0.5rem; list-style: none; margin: 0; padding: 0; }
.breadcrumbs li + li::before { content: "/"; margin-right: 0.5rem; color: var(--muted); }
.breadcrumbs a { font-size: inherit; }
.article-meta { color: var(--muted); font-size: 0.88rem; margin: 2rem 0 0; }
.reading-progress { background: var(--blue); height: 3px; left: 0; position: fixed; right: 0; top: 0; transform: scaleX(0); transform-origin: 0 50%; z-index: 40; }
.reading-grid { align-items: start; display: grid; gap: 2rem; grid-template-columns: minmax(0, 1fr); }
.table-of-contents { display: block; }
.table-of-contents details > summary { list-style: none; }
.table-of-contents details > summary::-webkit-details-marker { display: none; }
.toc-caret { border-right: 2px solid var(--ink); border-bottom: 2px solid var(--ink); height: 0.5em; transform: rotate(45deg); transition: transform 160ms ease; width: 0.5em; }
.table-of-contents details[open] .toc-caret { transform: rotate(-135deg); }
.table-of-contents details > summary h2, .related-guides h2 { font-size: 1.25rem; letter-spacing: -0.04em; margin: 0; }
.table-of-contents ol, .related-guides ul { padding-left: 1.3rem; }
.table-of-contents li, .related-guides li { margin: 0.7rem 0; }
.table-of-contents a { text-decoration: underline; text-underline-offset: 0.2rem; }
.table-of-contents a.is-active { color: var(--blue); font-weight: 700; }
.related-guides { border-top: 1px solid var(--line); margin-top: 4rem; padding-top: 2rem; }
.site-header { align-items: center; background: var(--paper); border-bottom: 1px solid var(--line); display: flex; justify-content: space-between; margin: 0 auto; max-width: 1440px; padding: 0.9rem 4vw; position: sticky; top: 0; z-index: 25; }
.brand { align-items: center; display: flex; gap: 0.85rem; text-decoration: none; }
.brand-mark { background: var(--ink); color: var(--lime); display: inline-flex; font-size: 0.78rem; font-weight: 800; letter-spacing: -0.04em; padding: 0.55rem 0.65rem; }
.brand-name { font-size: 0.88rem; font-weight: 700; letter-spacing: -0.01em; }
nav { display: flex; gap: clamp(1.2rem, 3vw, 3rem); }
nav a { font-size: 0.9rem; font-weight: 700; text-decoration: none; }
nav a:hover, nav a:focus-visible { text-decoration: underline; text-underline-offset: 0.35rem; }

.hero { display: grid; gap: clamp(3rem, 7vw, 7rem); grid-template-columns: minmax(0, 1.2fr) minmax(300px, 0.8fr); margin: 0 auto; max-width: 1440px; min-height: 690px; padding: clamp(5rem, 10vw, 9rem) 4vw 5rem; }
.hero-copy { align-self: center; max-width: 850px; }
.kicker { font-size: 0.76rem; font-weight: 800; letter-spacing: 0.12em; margin: 0 0 1.6rem; text-transform: uppercase; }
h1 { font-size: clamp(3.8rem, 7.4vw, 8.2rem); letter-spacing: -0.075em; line-height: 0.84; margin: 0; max-width: 980px; }
h1 span { color: var(--blue); display: block; }
.hero-deck { font-size: clamp(1.15rem, 1.8vw, 1.55rem); margin: 2.5rem 0; max-width: 650px; }
.primary-link { align-items: center; background: var(--ink); color: white; display: inline-flex; font-weight: 700; gap: 3rem; padding: 1rem 1.2rem; text-decoration: none; }
.primary-link:hover, .primary-link:focus-visible { background: var(--blue); }
.journey-panel { align-self: end; background: var(--ink); color: white; min-height: 490px; padding: 1.5rem; }
.panel-head { display: flex; font-size: 0.73rem; justify-content: space-between; letter-spacing: 0.1em; text-transform: uppercase; }
.journey-steps { list-style: none; margin: 2.2rem 0 1.8rem; padding: 0; }
.journey-steps li { align-items: baseline; border-top: 1px solid #474e52; display: grid; gap: 0.5rem; grid-template-columns: 2.2rem 1fr; padding: 0.85rem 0; }
.journey-steps li > span { color: var(--lime); font-size: 0.76rem; font-weight: 800; }
.journey-steps strong { font-size: clamp(1.2rem, 1.7vw, 1.65rem); letter-spacing: -0.035em; line-height: 1.1; }
.journey-steps small { color: #afb4b7; font-size: 0.78rem; grid-column: 2; }
.journey-note { border-left: 3px solid var(--lime); color: #c6c9cb; font-size: 0.9rem; margin: 0; padding-left: 1rem; }

.principles { border-bottom: 1px solid var(--line); border-top: 1px solid var(--line); display: grid; grid-template-columns: repeat(3, 1fr); }
.principle { align-items: baseline; display: flex; gap: 1rem; padding: 1.6rem 4vw; }
.principle + .principle { border-left: 1px solid var(--line); }
.principle span { color: var(--blue); font-size: 0.74rem; font-weight: 800; }
.principle p { font-size: 0.92rem; font-weight: 700; margin: 0; }
.topic-section { margin: 0 auto; max-width: 1440px; padding: clamp(5rem, 9vw, 9rem) 4vw 0; }
.topic-grid { display: grid; gap: 1px; grid-template-columns: repeat(2, minmax(0, 1fr)); background: var(--ink); border: 1px solid var(--ink); }
.topic-card { background: var(--paper); display: flex; flex-direction: column; padding: clamp(2rem, 4vw, 4rem); }
.topic-index { color: var(--blue); font-size: 0.75rem; font-weight: 800; letter-spacing: 0.08em; text-transform: uppercase; }
.topic-card h3 { font-size: clamp(2rem, 3.5vw, 4rem); letter-spacing: -0.055em; line-height: 1; margin: 2.5rem 0 1.2rem; max-width: 13ch; }
.topic-card > p { color: var(--muted); font-size: 1.05rem; margin: 0 0 3rem; max-width: 54ch; }
.topic-links { border-top: 1px solid var(--line); margin-top: auto; }
.topic-links a { display: flex; font-size: 0.9rem; font-weight: 700; justify-content: space-between; gap: 1rem; padding: 0.9rem 0; text-decoration: none; }
.topic-links a + a { border-top: 1px solid var(--line); }
.topic-links a:hover, .topic-links a:focus-visible { color: var(--blue); }
.guides-section { margin: 0 auto; max-width: 1440px; padding: clamp(5rem, 9vw, 9rem) 4vw; }
.section-heading { display: grid; gap: 1.2rem; grid-template-columns: 1fr 2fr 1fr; margin-bottom: 4rem; }
.section-heading h2 { font-size: clamp(2.5rem, 4vw, 4.8rem); letter-spacing: -0.06em; line-height: 0.98; margin: 0; }
.section-heading > p:last-child { align-self: end; color: var(--muted); margin: 0; }
.guide-list { border-top: 1px solid var(--ink); }
.guide-card { align-items: start; border-bottom: 1px solid var(--line); display: grid; gap: 2rem; grid-template-columns: 0.2fr 1fr auto; padding: 2.2rem 0; text-decoration: none; }
.guide-card:hover h3, .guide-card:focus-visible h3 { color: var(--blue); }
.guide-number, .guide-eyebrow { font-size: 0.75rem; font-weight: 800; letter-spacing: 0.08em; text-transform: uppercase; }
.guide-eyebrow { color: var(--blue); margin: 0 0 0.5rem; }
.guide-card h3 { font-size: clamp(1.5rem, 2.6vw, 2.6rem); letter-spacing: -0.04em; line-height: 1.05; margin: 0; transition: color 160ms ease; }
.guide-card div > p:last-child { color: var(--muted); margin: 0.8rem 0 0; max-width: 670px; }
.guide-arrow { font-size: 2rem; }

.article-shell { margin: 0 auto; max-width: 1280px; padding: 0 4vw 7rem; }
.article-header { border-bottom: 1px solid var(--ink); padding: clamp(4rem, 9vw, 8rem) 0 4rem; }
.article-header .back-link { display: inline-block; font-size: 0.82rem; font-weight: 700; margin-bottom: 4rem; text-decoration: none; }
.article-header .back-link:hover { text-decoration: underline; }
.article-header h1 { font-size: clamp(3.3rem, 7.2vw, 7.5rem); max-width: 1120px; }
.article-deck { font-size: clamp(1.2rem, 2vw, 1.65rem); margin: 3rem 0 0 auto; max-width: 760px; }
.takeaways { background: var(--ink); color: white; display: grid; gap: 2rem; grid-template-columns: 0.5fr 1fr; margin: 0 0 5rem auto; max-width: 920px; padding: 2rem; }
.takeaways > p { color: var(--lime); font-size: 0.75rem; font-weight: 800; letter-spacing: 0.1em; margin: 0; text-transform: uppercase; }
.takeaways ol { list-style: none; margin: 0; padding: 0; }
.takeaways li { border-top: 1px solid #3f464a; font-size: 1.1rem; padding: 0.9rem 0; }
.takeaways li:first-child { border-top: 0; padding-top: 0; }
.article-body { max-width: 980px; }
.article-body section { border-top: 1px solid var(--line); display: grid; gap: 2rem; grid-template-columns: 0.25fr 1fr; padding: 3.5rem 0; }
.section-number { color: var(--blue); font-size: 0.78rem; font-weight: 800; }
.article-body h2 { font-size: clamp(2rem, 4vw, 3.8rem); letter-spacing: -0.055em; line-height: 1; margin: 0 0 2rem; }
.article-body p { font-size: 1.12rem; margin: 0 0 1.35rem; max-width: 720px; }
blockquote { border-left: 5px solid var(--lime); font-size: clamp(1.4rem, 2.5vw, 2.1rem); font-weight: 700; letter-spacing: -0.03em; margin: 2.5rem 0 0; padding: 0.5rem 0 0.5rem 1.5rem; }
.article-footer { align-items: center; background: var(--blue); color: white; display: flex; justify-content: space-between; margin: 4rem 0 0; padding: 2rem; }
.article-footer p { margin: 0; max-width: 600px; }
.article-footer a { font-weight: 700; white-space: nowrap; }

.about-shell { margin: 0 auto; max-width: 1280px; padding: clamp(5rem, 10vw, 9rem) 4vw; }
.about-shell > section:first-of-type h1 { font-size: clamp(4rem, 8vw, 8rem); max-width: 1060px; }
.about-grid { border-top: 1px solid var(--ink); display: grid; gap: 4rem; grid-template-columns: 1fr 1fr; margin-top: 5rem; padding-top: 2.5rem; }
.about-grid > p { font-size: clamp(1.5rem, 3vw, 2.6rem); letter-spacing: -0.04em; line-height: 1.15; margin: 0; }
.about-grid div { color: var(--muted); font-size: 1.08rem; }
.about-grid div p:first-child { margin-top: 0; }
.editorial-code { margin-top: 8rem; }
.editorial-code ol { border-top: 1px solid var(--ink); list-style: none; margin: 0; padding: 0; }
.editorial-code li { align-items: baseline; border-bottom: 1px solid var(--line); display: grid; gap: 3rem; grid-template-columns: 0.7fr 1fr; padding: 2rem 0; }
.editorial-code strong { font-size: clamp(1.4rem, 3vw, 2.5rem); letter-spacing: -0.04em; }
.editorial-code span { color: var(--muted); }
.analytics-privacy { border-top: 1px solid var(--line); margin-top: 6rem; max-width: 820px; padding-top: 2.5rem; }
.analytics-privacy h2 { font-size: clamp(2rem, 4vw, 3.5rem); letter-spacing: -0.055em; line-height: 1.05; margin: 0 0 2rem; }
.analytics-privacy p { font-size: 1.05rem; }
.analytics-privacy a { text-underline-offset: 0.2rem; }
.analytics-privacy code { overflow-wrap: anywhere; font-size: 0.9em; }
.not-found { margin: 0 auto; max-width: 1100px; min-height: 70vh; padding: clamp(6rem, 13vw, 12rem) 4vw; }
.not-found h1 { font-size: clamp(4rem, 9vw, 8.5rem); }
.not-found > p:not(.kicker) { font-size: 1.2rem; margin: 2rem 0; }

footer { background: var(--ink); color: white; display: flex; gap: 2rem; justify-content: space-between; padding: 4rem 4vw; }
footer div p, footer > p { color: #afb4b7; font-size: 0.85rem; margin: 1rem 0 0; }
footer > nav { align-content: start; column-gap: 1.5rem; flex-wrap: wrap; max-width: 34rem; row-gap: 0.8rem; }
[data-analytics-settings] { background: none; border: 0; color: inherit; cursor: pointer; font: inherit; font-size: 0.9rem; font-weight: 700; line-height: inherit; padding: 0; text-align: left; }
[data-analytics-settings]:hover, [data-analytics-settings]:focus-visible { text-decoration: underline; text-underline-offset: 0.35rem; }

.consent-panel { background: var(--paper); border: 2px solid var(--ink); bottom: 1rem; box-shadow: 0 8px 30px #10151a22; max-height: calc(100vh - 2rem); max-height: calc(100dvh - 2rem); overflow: auto; padding: 1.4rem; position: fixed; right: 1rem; width: min(32rem, calc(100% - 2rem)); z-index: 30; }
.consent-panel h2 { font-size: 1.25rem; letter-spacing: -0.03em; line-height: 1.25; margin: 0; }
.consent-panel p, .consent-panel a { font-size: 0.9rem; }
.consent-panel a { text-underline-offset: 0.2rem; }
.consent-actions { display: flex; flex-wrap: wrap; gap: 0.75rem; margin-top: 1rem; }
.consent-actions button { background: var(--paper); border: 1px solid var(--ink); color: var(--ink); cursor: pointer; flex: 1 1 10rem; font: inherit; font-weight: 700; min-height: 44px; padding: 0.8rem 1rem; }
.consent-actions button:hover { background: var(--ink); color: white; }
.consent-panel[hidden], [data-analytics-settings][hidden] { display: none; }

/* Blog extends the existing publication: open rows and readable long-form text. */
.blog-shell, .blog-home { margin: 0 auto; max-width: 1280px; padding: 4rem 4vw 6rem; }
.blog-shell .breadcrumbs { font-size: 0.9rem; margin-bottom: 2.5rem; }
.blog-header { padding-bottom: 3rem; }
.blog-header h1 { font-size: clamp(3rem, 7vw, 6rem); letter-spacing: -0.04em; line-height: 1.02; text-wrap: balance; }
.blog-header > p { font-size: clamp(1.1rem, 2vw, 1.4rem); max-width: 66ch; margin: 1.8rem 0 0; }
.blog-index { border-top: 2px solid var(--ink); }
.blog-entry { border-bottom: 1px solid var(--line); display: grid; gap: 2rem; grid-template-columns: minmax(10rem, 0.3fr) minmax(0, 1fr); padding: 2.5rem 0; }
.blog-entry-meta { color: var(--muted); display: flex; flex-direction: column; gap: 0.4rem; font-size: 0.9rem; }
.blog-entry-meta > span:first-child { color: var(--ink); font-weight: 700; }
.blog-entry h2, .blog-entry h3 { font-size: clamp(1.7rem, 3vw, 2.65rem); letter-spacing: -0.035em; line-height: 1.13; margin: 0; text-wrap: balance; }
.blog-entry h2 a, .blog-entry h3 a { text-decoration: none; }
.blog-entry h2 a:hover, .blog-entry h3 a:hover { color: var(--blue); text-decoration: underline; text-underline-offset: 0.2em; }
.blog-entry p { color: var(--muted); font-size: 1.05rem; max-width: 65ch; margin: 1rem 0 0; }
.blog-editorial-note { color: var(--muted); font-size: 0.9rem; max-width: 80ch; margin-top: 2rem; }
.blog-next { margin-top: 4rem; padding-top: 2rem; border-top: 1px solid var(--line); }
.blog-next h2, .blog-home-heading h2 { font-size: clamp(1.8rem, 3vw, 3rem); letter-spacing: -0.035em; line-height: 1.1; margin: 0; }
.blog-next a, .blog-home-heading > a { font-weight: 700; text-underline-offset: 0.25em; }
.blog-home { border-top: 1px solid var(--line); }
.blog-home-heading { display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: 1.5rem; margin-bottom: 1.5rem; }
.blog-article .article-header { padding-top: 3rem; }
.blog-article .article-header h1 { font-size: clamp(2.8rem, 6vw, 5.8rem); letter-spacing: -0.04em; line-height: 1.03; text-wrap: balance; }
.blog-article .article-deck { margin: 2rem 0 0; max-width: 70ch; }
.article-method { border-left: 3px solid var(--blue); color: var(--muted); font-size: 0.94rem; line-height: 1.55; margin: 1.5rem 0 0; max-width: 75ch; padding-left: 1rem; }
.blog-article .breadcrumbs { font-size: 0.9rem; margin-bottom: 2.5rem; }
.blog-article .takeaways { margin: 0 0 3rem; }
.blog-article .article-body { max-width: 76ch; }
.blog-article .article-body section { display: block; padding: 2.8rem 0; }
.blog-article .article-body h2 { font-size: clamp(1.8rem, 3vw, 2.8rem); letter-spacing: -0.03em; line-height: 1.12; margin-bottom: 1.5rem; text-wrap: balance; }
.blog-article .article-body p, .blog-article .article-body li { font-size: 1.1rem; line-height: 1.75; }
.blog-article .article-body li { margin: 0.8rem 0; }
.blog-article .article-body ul { padding-left: 1.4rem; }
.blog-article .article-body .article-sources { font-size: 0.9rem; color: var(--muted); }
.article-sources a { text-underline-offset: 0.2em; }
.data-figure { background: #fff; border: 1px solid var(--line); margin: 2.5rem 0; padding: clamp(1rem, 3vw, 2rem); }
.data-figure figcaption { font-size: clamp(1.25rem, 2vw, 1.7rem); font-weight: 800; letter-spacing: -0.03em; line-height: 1.2; margin-bottom: 1.5rem; }
.data-chart-scroll { overflow-x: auto; }
.data-chart { border-collapse: collapse; min-width: 480px; table-layout: fixed; width: 100%; }
.data-chart th, .data-chart td { border-top: 1px solid var(--line); padding: 0.8rem 0.65rem; text-align: left; vertical-align: middle; }
.data-chart thead th { border-top: 0; color: var(--muted); font-size: 0.8rem; text-transform: uppercase; }
.data-chart th:first-child { width: 11rem; }
.data-chart tbody th { font-size: 1rem; }
.data-chart-value { display: block; font-size: 1.05rem; font-weight: 800; margin-bottom: 0.35rem; }
.data-chart-track { background: #e9eaec; display: block; height: 0.7rem; width: 100%; }
.data-chart-bar { display: block; height: 100%; }
.data-chart-bar-1 { background: var(--blue); }
.data-chart-bar-2 { background: var(--ink); }
.blog-article .article-body .data-figure-scale, .blog-article .article-body .data-figure-note, .blog-article .article-body .data-figure-source { color: var(--muted); font-size: 0.86rem; line-height: 1.5; margin: 1rem 0 0; }
.data-figure-source a { text-underline-offset: 0.2em; }
.article-screenshot { margin: 2.5rem 0; }
.article-screenshot img { display: block; width: 100%; height: auto; border: 1px solid var(--line); }
.article-screenshot figcaption { color: var(--muted); font-size: 0.9rem; line-height: 1.5; margin-top: 0.8rem; }

@media (max-width: 1079px) {
  .reading-grid { gap: 0; }
  .table-of-contents { border-bottom: 1px solid var(--line); margin-bottom: 0; }
  .table-of-contents details > summary { align-items: center; cursor: pointer; display: flex; justify-content: space-between; padding: 1rem 0; }
  .table-of-contents details > summary h2 { font-size: 0.8rem; letter-spacing: 0.1em; margin: 0; text-transform: uppercase; }
  .table-of-contents details > ol { margin: 0.25rem 0 1rem; }
  .table-of-contents details[open] > summary h2 { letter-spacing: 0.14em; }
}

@media (min-width: 1080px) {
  .reading-grid { grid-template-columns: 280px minmax(0, 1fr); column-gap: clamp(3rem, 6vw, 6rem); }
  .table-of-contents { max-height: calc(100vh - 7rem); overflow-y: auto; position: sticky; top: 6rem; }
  .table-of-contents details > summary { display: none; }
  .table-of-contents details > summary h2 { color: var(--muted); font-size: 0.78rem; letter-spacing: 0.12em; margin: 0 0 1rem; text-transform: uppercase; }
  .table-of-contents ol { list-style: none; margin: 0; padding: 0; }
  .table-of-contents li { margin: 0; }
  .table-of-contents li + li { border-top: 1px solid var(--line); }
  .table-of-contents a { border-left: 3px solid transparent; color: var(--muted); display: block; font-size: 0.9rem; font-weight: 400; padding: 0.6rem 0.7rem; text-decoration: none; }
  .table-of-contents a:hover, .table-of-contents a:focus-visible { color: var(--ink); }
  .table-of-contents a.is-active { border-left-color: var(--lime); color: var(--ink); font-weight: 700; }
}

@media (max-width: 600px) {
  .blog-entry { grid-template-columns: 1fr; gap: 1rem; padding: 2rem 0; }
  .blog-entry-meta { flex-direction: row; flex-wrap: wrap; column-gap: 1rem; }
  .blog-shell { padding-top: 2.5rem; }
  .blog-article .takeaways { padding: 1.4rem; }
  .blog-article .article-footer { padding: 1.5rem; }
  .site-header > nav { gap: 1.2rem; }
  .reading-grid { gap: 0; }
}

@media (max-width: 800px) {
  .brand-name { display: none; }
  .hero { grid-template-columns: 1fr; min-height: auto; padding-top: 4rem; }
  .journey-panel { min-height: auto; }
  .principles { grid-template-columns: 1fr; }
  .principle + .principle { border-left: 0; border-top: 1px solid var(--line); }
  .topic-grid { grid-template-columns: 1fr; }
  .section-heading, .about-grid, .editorial-code li { grid-template-columns: 1fr; }
  .section-heading .kicker { margin-bottom: 0; }
  .guide-card { gap: 1rem; grid-template-columns: auto 1fr auto; }
  .article-body section { grid-template-columns: 1fr; }
  .takeaways { grid-template-columns: 1fr; margin-bottom: 3rem; }
  .article-footer { align-items: start; flex-direction: column; gap: 2rem; }
  footer { flex-direction: column; gap: 3rem; }
}

@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } .toc-caret { transition: none; } .table-of-contents details > summary h2 { letter-spacing: 0.1em; } }