:root {
  color-scheme: light;
  --pc-bg: #f4f6fa;
  --pc-surface: #ffffff;
  --pc-ink: #10203f;
  --pc-muted: #586781;
  --pc-line: #d7deea;
  --pc-accent: #334bd6;
  --pc-accent-dark: #2538a9;
  --pc-soft: #edf1ff;
  --pc-warm: #fff7e9;
  --pc-orange: #d96c12;
  --pc-deep: #142342;
  --pc-shadow: 0 20px 60px rgba(20, 35, 66, .08);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--pc-bg); color: var(--pc-ink); font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; line-height: 1.6; }
a { color: var(--pc-accent); text-underline-offset: 3px; }
img { max-width: 100%; height: auto; }
.skip-link { position: fixed; left: 12px; top: 12px; z-index: 100; transform: translateY(-160%); padding: 10px 14px; border-radius: 8px; background: var(--pc-deep); color: #fff; }
.skip-link:focus { transform: none; }
.public-shell { width: min(1180px, calc(100% - 40px)); margin: auto; }
:is(a, button, summary):focus-visible { outline: 3px solid #8295ff; outline-offset: 3px; }
.public-cta { display: inline-flex; align-items: center; justify-content: center; min-height: 44px; padding: 10px 18px; border-radius: 10px; background: var(--pc-accent); color: #fff; font-size: 13px; font-weight: 750; text-decoration: none; }
.public-cta:hover { background: var(--pc-accent-dark); }
.text-link { font-size: 13px; font-weight: 780; text-decoration: none; }
.kicker, .topic { margin: 0 0 14px; color: var(--pc-accent); font-size: 10px; font-weight: 820; letter-spacing: .14em; text-transform: uppercase; }

.breadcrumbs { display: flex; align-items: center; gap: 9px; padding: 24px 0 0; color: var(--pc-muted); font-size: 12px; overflow: hidden; }
.breadcrumbs a { color: var(--pc-muted); }
.breadcrumbs span[aria-current="page"] { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.knowledge-nav { display: flex; align-items: center; justify-content: space-between; gap: 28px; margin-top: 22px; padding: 18px 0; border-block: 1px solid var(--pc-line); }
.knowledge-nav > div:first-child { display: grid; gap: 2px; }
.knowledge-label { color: var(--pc-ink); font-size: 14px; font-weight: 800; letter-spacing: -.01em; }
.knowledge-purpose { color: var(--pc-muted); font-size: 12px; }
.knowledge-links { display: flex; align-items: stretch; gap: 6px; }
.knowledge-links a { display: grid; min-width: 116px; padding: 9px 14px; border-left: 2px solid transparent; color: var(--pc-muted); font-size: 13px; font-weight: 760; text-decoration: none; }
.knowledge-links a small { color: var(--pc-muted); font-size: 9px; font-weight: 650; letter-spacing: .1em; text-transform: uppercase; }
.knowledge-links a[aria-current="page"] { border-color: var(--pc-accent); background: var(--pc-soft); color: var(--pc-accent); }

.knowledge-hero { display: grid; grid-template-columns: minmax(0, 1fr) 260px; align-items: end; gap: 70px; padding: 62px 0 58px; border-bottom: 1px solid var(--pc-line); }
.knowledge-hero h1, .article-header h1 { max-width: 850px; margin: 0; font-size: clamp(42px, 5.5vw, 68px); line-height: 1.02; letter-spacing: -.055em; }
.knowledge-hero > div > p:last-child { max-width: 720px; margin: 22px 0 0; color: var(--pc-muted); font-size: 18px; line-height: 1.72; }
.resources-hero img { width: 220px; justify-self: end; filter: drop-shadow(0 18px 20px rgba(16, 32, 63, .08)); }
.hero-position { margin: 0 0 5px; padding-left: 20px; border-left: 2px solid var(--pc-accent); color: var(--pc-muted); font-size: 14px; line-height: 1.8; }
.hero-position strong { color: var(--pc-ink); }

.featured-resource { display: grid; grid-template-columns: minmax(0, 1.35fr) minmax(260px, .65fr); gap: 54px; margin: 36px 0 74px; padding: 48px; border: 1px solid var(--pc-line); border-radius: 22px; background: var(--pc-surface); box-shadow: var(--pc-shadow); }
.featured-copy h2 { max-width: 700px; margin: 0; font-size: clamp(30px, 4vw, 48px); line-height: 1.08; letter-spacing: -.045em; }
.featured-copy h2 a { color: var(--pc-ink); text-decoration: none; }
.featured-copy > p:not(.kicker) { max-width: 700px; margin: 18px 0; color: var(--pc-muted); font-size: 16px; line-height: 1.8; }
.featured-copy > .text-link { display: inline-block; margin-top: 22px; }
.featured-resource blockquote { align-self: stretch; display: flex; align-items: flex-end; margin: 0; padding: 28px; border-radius: 16px; background: var(--pc-deep); color: #fff; font-family: Georgia, "Times New Roman", serif; font-size: 24px; line-height: 1.45; }
.resource-meta { display: flex; flex-wrap: wrap; gap: 8px 18px; color: var(--pc-muted); font-size: 11px; }

.learning-path { display: grid; grid-template-columns: minmax(260px, .72fr) minmax(0, 1.28fr); gap: 72px; padding: 0 0 76px; }
.learning-path h2, .library-heading h2, .knowledge-bridge h2, .article-connections h2 { margin: 0; font-size: clamp(28px, 3.5vw, 40px); line-height: 1.12; letter-spacing: -.04em; }
.learning-path header > p:last-child, .library-heading > p:last-child { color: var(--pc-muted); font-size: 14px; line-height: 1.75; }
.learning-path ol { margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--pc-line); }
.learning-path li { display: grid; grid-template-columns: 44px 1fr; gap: 10px; align-items: baseline; padding: 20px 0; border-bottom: 1px solid var(--pc-line); }
.learning-path li span { color: var(--pc-accent); font-size: 10px; font-weight: 800; letter-spacing: .08em; }
.learning-path li a { color: var(--pc-ink); font-size: 17px; font-weight: 720; line-height: 1.35; text-decoration: none; }
.learning-path li a:hover { color: var(--pc-accent); }

.topic-index, .question-index { margin-bottom: 78px; padding: 28px 0; border-block: 1px solid var(--pc-line); }
.topic-index > div, .question-index > div { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 10px; }
.topic-index a, .question-index a { display: grid; gap: 2px; min-height: 72px; padding: 15px 16px; border-left: 2px solid var(--pc-line); color: var(--pc-ink); text-decoration: none; }
.topic-index a:hover, .question-index a:hover { border-color: var(--pc-accent); background: var(--pc-soft); }
.topic-index a strong, .question-index a strong { font-size: 13px; line-height: 1.35; }
.topic-index a span, .question-index a span { color: var(--pc-muted); font-size: 10px; }

.resource-library { padding-bottom: 76px; }
.library-heading { display: grid; grid-template-columns: minmax(0, 1fr) minmax(240px, .45fr); gap: 36px; align-items: end; padding-bottom: 36px; }
.library-heading .kicker { grid-column: 1 / -1; margin-bottom: -24px; }
.topic-section { scroll-margin-top: 24px; display: grid; grid-template-columns: 250px minmax(0, 1fr); gap: 54px; padding: 40px 0; border-top: 1px solid var(--pc-line); }
.topic-section > header h2 { margin: 0; font-size: 20px; line-height: 1.25; letter-spacing: -.025em; }
.topic-section > header p { color: var(--pc-muted); font-size: 12px; line-height: 1.7; }
.library-row { display: grid; grid-template-columns: minmax(0, 1fr) 170px; gap: 30px; padding: 0 0 30px; }
.library-row + .library-row { padding-top: 30px; border-top: 1px solid var(--pc-line); }
.library-row h3 { margin: 0; font-size: 24px; line-height: 1.25; letter-spacing: -.03em; }
.library-row h3 a { color: var(--pc-ink); text-decoration: none; }
.library-row h3 a:hover { text-decoration: underline; }
.library-row > div:first-child > p:not(.topic) { margin: 12px 0 0; color: var(--pc-muted); font-size: 14px; line-height: 1.75; }
.library-row-end { display: grid; align-content: space-between; justify-items: end; gap: 18px; }
.library-row-end .resource-meta { display: grid; justify-items: end; }

.knowledge-bridge, .article-footer { display: flex; align-items: center; justify-content: space-between; gap: 44px; margin: 0 0 72px; padding: 42px 46px; border-radius: 20px; background: var(--pc-deep); color: #fff; }
.knowledge-bridge > div:first-child, .article-footer > div:first-child { max-width: 660px; }
.knowledge-bridge p:not(.kicker), .article-footer p:not(.kicker) { margin: 11px 0 0; color: #c6d1e7; font-size: 14px; }
.knowledge-bridge .kicker, .article-footer .kicker { color: #9db1f3; }
.bridge-actions { display: flex; flex-wrap: wrap; align-items: center; justify-content: flex-end; gap: 15px 20px; }
.bridge-actions > a:not(.public-cta) { color: #dbe3ff; font-size: 12px; font-weight: 700; }

.questions-hero { grid-template-columns: minmax(0, 1fr) 300px; }
.question-index { margin-top: 34px; }
.question-groups { padding-bottom: 76px; }
.question-group { scroll-margin-top: 24px; display: grid; grid-template-columns: 280px minmax(0, 1fr); gap: 64px; padding: 50px 0; border-top: 1px solid var(--pc-line); }
.question-group > header { display: grid; grid-template-columns: 28px 1fr; gap: 15px; align-content: start; }
.section-number { margin: 4px 0 0; color: var(--pc-accent); font-size: 10px; font-weight: 800; letter-spacing: .1em; }
.question-group h2 { margin: 0; font-size: 24px; line-height: 1.2; letter-spacing: -.035em; }
.question-group header div > p { margin: 12px 0 0; color: var(--pc-muted); font-size: 12px; line-height: 1.7; }
.question-list { border-top: 1px solid var(--pc-line); }
.question { border-bottom: 1px solid var(--pc-line); scroll-margin-top: 24px; }
.question summary { display: grid; grid-template-columns: 42px minmax(0, 1fr) 26px; gap: 10px; align-items: baseline; min-height: 68px; padding: 21px 0; color: var(--pc-ink); cursor: pointer; list-style: none; }
.question summary::-webkit-details-marker { display: none; }
.question summary::after { content: "+"; color: var(--pc-accent); font-size: 22px; font-weight: 400; text-align: right; }
.question[open] summary::after { content: "–"; }
.question-number { color: var(--pc-accent); font-size: 10px; font-weight: 800; letter-spacing: .08em; }
.question-title { font-size: 18px; font-weight: 730; line-height: 1.4; }
.question-answer { max-width: 720px; padding: 0 26px 30px 52px; }
.question-answer > p { margin: 0 0 13px; color: var(--pc-muted); font-size: 15px; line-height: 1.82; }
.question-answer .state-label { display: inline-flex; width: auto; margin-bottom: 16px; padding: 5px 9px; border: 1px solid #afbae9; border-radius: 999px; background: var(--pc-soft); color: var(--pc-accent); font-size: 9px; font-weight: 800; letter-spacing: .07em; text-transform: uppercase; }
.answer-route, .next-question { display: grid; gap: 2px; margin-top: 23px !important; padding-top: 16px; border-top: 1px solid var(--pc-line); }
.answer-route span:first-child, .next-question span:first-child { color: var(--pc-muted); font-size: 9px; font-weight: 800; letter-spacing: .1em; text-transform: uppercase; }
.answer-route a, .next-question a { width: fit-content; font-size: 12px; font-weight: 720; text-decoration: none; }

.article-layout { max-width: 1040px; margin: auto; }
.article-header { padding: 66px 0 52px; border-bottom: 1px solid var(--pc-line); }
.article-header h1 { max-width: 930px; }
.article-summary { max-width: 830px; margin: 27px 0 22px; color: var(--pc-muted); font-size: 20px; line-height: 1.65; }
.article-byline { display: flex; flex-wrap: wrap; gap: 8px 24px; color: var(--pc-muted); font-size: 11px; }
.key-takeaway { display: grid; grid-template-columns: 100px 1fr; gap: 24px; max-width: 830px; margin-top: 30px; padding: 22px 24px; border-left: 3px solid var(--pc-accent); background: var(--pc-soft); }
.key-takeaway > span { color: var(--pc-accent); font-size: 9px; font-weight: 800; letter-spacing: .1em; text-transform: uppercase; }
.key-takeaway p { margin: 0; color: var(--pc-muted); font-size: 14px; line-height: 1.7; }
.article-reading-layout { display: grid; grid-template-columns: 210px minmax(0, 760px); gap: 70px; align-items: start; }
.article-toc { position: sticky; top: 24px; padding: 58px 0; }
.article-toc nav { display: grid; border-top: 1px solid var(--pc-line); }
.article-toc nav a { padding: 11px 0; border-bottom: 1px solid var(--pc-line); color: var(--pc-muted); font-size: 11px; line-height: 1.45; text-decoration: none; }
.article-toc nav a:hover { color: var(--pc-accent); }
.article-toc > a { display: inline-block; margin-top: 20px; font-size: 11px; font-weight: 700; text-decoration: none; }
.article-body { padding: 28px 0 62px; }
.article-body section { scroll-margin-top: 24px; padding: 30px 0; }
.article-body h2 { margin: 0 0 18px; color: var(--pc-ink); font-size: 30px; line-height: 1.25; letter-spacing: -.035em; }
.article-body p, .article-body li { color: var(--pc-muted); font-size: 16px; line-height: 1.85; }
.article-body p { margin: 0 0 18px; }
.article-body ul, .article-body ol { margin: 20px 0; padding-left: 25px; }
.article-body li { margin: 10px 0; padding-left: 7px; }
.article-steps { counter-reset: article-step; list-style: none; padding: 0 !important; }
.article-steps li { counter-increment: article-step; display: grid; grid-template-columns: 32px 1fr; gap: 14px; padding: 14px 0; border-bottom: 1px solid var(--pc-line); }
.article-steps li::before { content: counter(article-step, decimal-leading-zero); color: var(--pc-accent); font-size: 11px; font-weight: 800; letter-spacing: .06em; }
.comparison-wrap { margin: 26px 0; overflow-x: auto; border: 1px solid var(--pc-line); border-radius: 12px; }
.comparison-wrap table { width: 100%; min-width: 650px; border-collapse: collapse; background: var(--pc-surface); font-size: 13px; }
.comparison-wrap th, .comparison-wrap td { padding: 16px; border-bottom: 1px solid var(--pc-line); text-align: left; vertical-align: top; }
.comparison-wrap thead th { background: var(--pc-soft); color: var(--pc-ink); }
.comparison-wrap tbody th { color: var(--pc-ink); }

.article-connections { padding: 55px 0; border-top: 1px solid var(--pc-line); }
.connections-heading { display: flex; align-items: end; justify-content: space-between; margin-bottom: 28px; }
.related-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); border-block: 1px solid var(--pc-line); }
.related-grid article { padding: 28px 28px 28px 0; }
.related-grid article + article { padding-left: 28px; border-left: 1px solid var(--pc-line); }
.related-grid h3 { margin: 0; font-size: 20px; line-height: 1.3; }
.related-grid h3 a { color: var(--pc-ink); text-decoration: none; }
.related-grid article > p:not(.topic) { color: var(--pc-muted); font-size: 13px; line-height: 1.7; }
.related-questions { display: grid; grid-template-columns: 190px 1fr 1fr; gap: 22px; align-items: baseline; padding-top: 25px; }
.related-questions p { margin: 0; color: var(--pc-muted); font-size: 10px; font-weight: 800; letter-spacing: .1em; text-transform: uppercase; }
.related-questions a { font-size: 12px; font-weight: 700; text-decoration: none; }
.article-pagination { display: grid; grid-template-columns: 1fr 1fr; margin-bottom: 54px; border-block: 1px solid var(--pc-line); }
.article-pagination a { display: grid; gap: 5px; padding: 24px 0; color: var(--pc-ink); text-decoration: none; }
.article-pagination a + a { padding-left: 32px; border-left: 1px solid var(--pc-line); text-align: right; }
.article-pagination a span { color: var(--pc-muted); font-size: 9px; font-weight: 800; letter-spacing: .1em; text-transform: uppercase; }
.article-pagination a strong { font-size: 13px; line-height: 1.5; }

.public-footer { display: grid; grid-template-columns: 1fr auto; gap: 50px; padding: 42px 0 54px; border-top: 1px solid var(--pc-line); color: var(--pc-muted); }
.public-footer strong { color: var(--pc-ink); }
.public-footer p { margin: 6px 0; font-size: 12px; }
.public-footer small { font-size: 10px; }
.public-footer-links { display: grid; justify-items: end; gap: 12px; }
.public-footer nav { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 9px 17px; }
.public-footer a { color: var(--pc-muted); font-size: 11px; text-decoration: none; }
.public-footer a:hover { text-decoration: underline; }
.public-footer .public-footer-social { gap: 4px; margin: -8px -8px 0 0; }
.public-footer .public-footer-social a { display: inline-grid; place-items: center; width: 36px; height: 36px; border-radius: 50%; color: var(--pc-muted); transition: color .15s, background-color .15s; }
.public-footer .public-footer-social a:hover, .public-footer .public-footer-social a:focus-visible { color: var(--pc-ink); background: var(--pc-line); text-decoration: none; }
.public-footer-social svg { width: 18px; height: 18px; fill: currentColor; }

body.dark-mode { color-scheme: dark; --pc-bg: #0e1728; --pc-surface: #17233a; --pc-ink: #edf2ff; --pc-muted: #b3bfd5; --pc-line: #34425c; --pc-accent: #9db1ff; --pc-accent-dark: #8199f5; --pc-soft: #1c2a48; --pc-warm: #322819; --pc-orange: #ffad63; --pc-deep: #172847; --pc-shadow: none; }
.dark-mode .public-cta { color: #fff; background: #4057dc; }
.dark-mode .featured-resource blockquote { background: #111d33; }
.dark-mode .resources-hero img { filter: drop-shadow(0 18px 24px rgba(0, 0, 0, .28)); }

@media (max-width: 900px) {
  .knowledge-hero { grid-template-columns: minmax(0, 1fr) 190px; gap: 35px; }
  .topic-index > div, .question-index > div { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .featured-resource { grid-template-columns: 1fr; }
  .featured-resource blockquote { min-height: 190px; }
  .learning-path, .question-group { grid-template-columns: 1fr; gap: 32px; }
  .topic-section { grid-template-columns: 210px minmax(0, 1fr); gap: 36px; }
  .article-reading-layout { grid-template-columns: 170px minmax(0, 1fr); gap: 42px; }
}

@media (max-width: 768px) {
  .public-shell { width: min(100% - 32px, 1180px); }
  .knowledge-nav { align-items: flex-start; flex-direction: column; gap: 12px; }
  .knowledge-links { width: 100%; }
  .knowledge-links a { flex: 1; min-width: 0; }
  .knowledge-hero { grid-template-columns: 1fr; gap: 22px; padding: 46px 0; }
  .resources-hero img { width: 145px; justify-self: start; }
  .questions-hero .hero-position { max-width: 430px; }
  .featured-resource { margin-bottom: 58px; padding: 34px; }
  .learning-path { gap: 28px; padding-bottom: 58px; }
  .library-heading { grid-template-columns: 1fr; gap: 10px; }
  .library-heading .kicker { grid-column: auto; margin-bottom: 0; }
  .topic-section { grid-template-columns: 1fr; gap: 20px; }
  .topic-section > header { max-width: 520px; }
  .knowledge-bridge, .article-footer { align-items: flex-start; flex-direction: column; padding: 34px; }
  .bridge-actions { justify-content: flex-start; }
  .question-group { padding: 40px 0; }
  .article-reading-layout { grid-template-columns: minmax(0, 1fr); gap: 0; }
  .article-toc { position: static; padding: 34px 0 10px; }
  .article-toc nav { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0 22px; }
  .related-questions { grid-template-columns: 1fr; gap: 10px; }
  .public-footer { grid-template-columns: 1fr; gap: 24px; }
  .public-footer-links { justify-items: start; }
  .public-footer .public-footer-social { gap: 6px; margin: 0 0 0 -8px; }
  .public-footer .public-footer-social a { width: 44px; height: 44px; }
  .public-footer-social svg { width: 20px; height: 20px; }
  .public-footer nav { justify-content: flex-start; }
}

@media (max-width: 520px) {
  .public-shell { width: min(100% - 24px, 1180px); }
  .breadcrumbs { padding-top: 18px; }
  .knowledge-purpose { display: none; }
  .knowledge-nav { margin-top: 15px; }
  .knowledge-hero h1, .article-header h1 { font-size: clamp(35px, 11vw, 49px); }
  .knowledge-hero > div > p:last-child, .article-summary { font-size: 16px; }
  .resources-hero img { width: 112px; }
  .featured-resource { margin-top: 24px; padding: 25px 22px; border-radius: 16px; }
  .featured-copy h2 { font-size: 29px; }
  .featured-resource blockquote { min-height: 145px; padding: 22px; font-size: 20px; }
  .topic-index > div, .question-index > div { grid-template-columns: 1fr; }
  .topic-index a, .question-index a { min-height: 58px; }
  .library-row { grid-template-columns: 1fr; gap: 18px; }
  .library-row-end, .library-row-end .resource-meta { justify-items: start; }
  .knowledge-bridge, .article-footer { margin-bottom: 52px; padding: 28px 23px; }
  .bridge-actions { align-items: flex-start; flex-direction: column; }
  .question-group > header { grid-template-columns: 24px 1fr; }
  .question summary { grid-template-columns: 34px minmax(0, 1fr) 24px; min-height: 64px; }
  .question-title { font-size: 16px; }
  .question-answer { padding: 0 0 28px 44px; }
  .article-header { padding: 48px 0 38px; }
  .article-byline { display: grid; gap: 4px; }
  .key-takeaway { grid-template-columns: 1fr; gap: 7px; padding: 19px; }
  .article-toc nav { grid-template-columns: 1fr; }
  .article-body h2 { font-size: 25px; }
  .article-body p, .article-body li { font-size: 15px; }
  .related-grid { grid-template-columns: 1fr; }
  .related-grid article { padding: 24px 0; }
  .related-grid article + article { padding-left: 0; border-top: 1px solid var(--pc-line); border-left: 0; }
  .article-pagination { grid-template-columns: 1fr; }
  .article-pagination a + a { padding-left: 0; border-top: 1px solid var(--pc-line); border-left: 0; text-align: left; }
  .public-footer { padding-bottom: 38px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
}

/* Free follow-up check page */
.check-about { max-width: 760px; margin: 8px auto 48px; padding: 24px 0 0; border-top: 1px solid var(--pc-line); }
.check-about h2 { margin: 0 0 8px; font-size: 18px; }
.check-about p { margin: 0; color: var(--pc-muted); line-height: 1.7; }