:root {
  color-scheme: light;
  --paper: #f1f4f8;
  --paper-deep: #e2e8f0;
  --ink: #15243a;
  --muted: #53647a;
  --line: #bdc9d7;
  --accent: #1759e8;
  --accent-dark: #1044b7;
  --panel: #e1e8f1;
  --display: "Trebuchet MS", Arial, sans-serif;
  --body: Arial, Helvetica, sans-serif;
  --mono: "Courier New", monospace;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--paper); color: var(--ink); font-family: var(--body); font-size: 16px; line-height: 1.7; }
a { color: inherit; }
a:hover { color: var(--accent-dark); }
button { font: inherit; }
::selection { background: var(--accent); color: var(--paper); }
.skip-link { position: absolute; z-index: 9; left: 1rem; top: -4rem; padding: .7rem 1rem; background: var(--ink); color: var(--paper); }
.skip-link:focus { top: 1rem; }
.site-header { border-bottom: 1px solid var(--line); }
.header-inner { width: min(1220px, calc(100% - 56px)); min-height: 82px; margin: auto; display: flex; align-items: center; justify-content: space-between; gap: 2rem; }
.brand { display: inline-flex; align-items: center; gap: 12px; text-decoration: none; font-weight: 700; letter-spacing: -.045em; font-size: 17px; line-height: 1.15; }
.brand-mark { width: 34px; height: 34px; background: var(--accent); color: var(--paper); display: grid; place-items: center; font-family: var(--mono); font-size: 13px; letter-spacing: -.08em; }
.brand span:last-child { max-width: 190px; }
.nav { display: flex; gap: clamp(18px, 3vw, 42px); align-items: center; }
.nav a { font-size: 13px; font-weight: 600; text-decoration: none; }
.nav a[aria-current="page"] { color: var(--accent-dark); }
.nav-contact { border: 1px solid var(--ink); padding: 10px 15px; }
.menu-toggle { display: none; background: none; border: 1px solid var(--line); padding: 8px 12px; color: var(--ink); }
.wrap { width: min(1120px, calc(100% - 56px)); margin-inline: auto; }
.narrow { width: min(760px, calc(100% - 48px)); margin-inline: auto; }
.eyebrow { display: inline-flex; align-items: center; gap: 10px; color: var(--muted); text-transform: uppercase; letter-spacing: .14em; font: 11px var(--mono); }
.eyebrow::before { content: ""; display: inline-block; height: 2px; width: 24px; background: var(--accent); }
h1, h2, h3, p { margin-top: 0; }
h1, h2, h3 { line-height: 1.1; }
h1 { font-family: var(--display); font-weight: 500; font-size: clamp(46px, 7.5vw, 88px); letter-spacing: -.045em; }
h2 { font-family: var(--display); font-weight: 500; font-size: clamp(32px, 4vw, 48px); letter-spacing: -.03em; }
h3 { font-size: 18px; letter-spacing: -.02em; }
.lede { max-width: 680px; font-size: clamp(18px, 2vw, 21px); color: #40516a; line-height: 1.55; }
.text-link { display: inline-flex; gap: 12px; align-items: center; color: var(--ink); font-weight: 700; text-decoration-thickness: 1px; text-underline-offset: 5px; }
.text-link::after { content: "↗"; color: var(--accent); font-size: 19px; }
.hero-home { padding: 68px 0 74px; }
.hero-grid { display: grid; grid-template-columns: 1.08fr .92fr; gap: 7%; align-items: center; }
.hero-home h1 { max-width: 680px; margin: 25px 0 22px; }
.hero-home h1 em { color: var(--accent); font-style: normal; }
.hero-visual { position: relative; min-height: 400px; background: var(--panel); overflow: hidden; display: grid; place-items: center; }
.hero-visual::before, .hero-visual::after { content: ""; position: absolute; border: 1px solid rgba(32,44,42,.24); border-radius: 50%; width: 320px; height: 320px; }
.hero-visual::after { width: 230px; height: 230px; }
.hero-visual svg { width: 93%; height: auto; position: relative; z-index: 1; }
.hero-visual img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.visual-note { position: absolute; z-index: 2; bottom: 20px; left: 20px; font: 10px var(--mono); text-transform: uppercase; letter-spacing: .12em; }
.visual-index { position: absolute; right: 20px; top: 18px; font: 11px var(--mono); color: var(--muted); }
.editorial-strip { border-block: 1px solid var(--line); padding: 20px 0; }
.strip-inner { display: flex; align-items: center; justify-content: space-between; gap: 20px; }
.strip-inner p { margin: 0; color: var(--muted); font-size: 13px; }
.strip-stamp { font: 11px var(--mono); color: var(--accent-dark); text-transform: uppercase; letter-spacing: .1em; white-space: nowrap; }
.section { padding: 84px 0; }
.section-heading { display: flex; justify-content: space-between; align-items: end; gap: 30px; margin-bottom: 36px; }
.section-heading h2 { max-width: 520px; margin-bottom: 0; }
.feature-grid { display: grid; grid-template-columns: 1.3fr .7fr; gap: 24px; }
.feature-card { background: var(--panel); padding: 30px; min-height: 280px; display: flex; flex-direction: column; justify-content: space-between; text-decoration: none; border-top: 3px solid var(--accent); }
.feature-card h3 { font: 500 33px/1.15 var(--display); max-width: 540px; }
.feature-card p { color: #40516a; max-width: 520px; margin-bottom: 20px; }
.feature-card.secondary { background: var(--ink); color: var(--paper); border-color: var(--accent); }
.feature-card.secondary p { color: #c0cede; }
.card-meta { display: flex; justify-content: space-between; font: 10px var(--mono); text-transform: uppercase; letter-spacing: .1em; }
.guide-index { display: grid; grid-template-columns: repeat(2, 1fr); border-top: 1px solid var(--line); }
.guide-link { display: grid; grid-template-columns: 48px 1fr 24px; gap: 12px; align-items: baseline; text-decoration: none; padding: 18px 8px 18px 0; border-bottom: 1px solid var(--line); }
.guide-link:nth-child(odd) { margin-right: 30px; }
.guide-link .number { font: 11px var(--mono); color: var(--accent-dark); }
.guide-link strong { font-weight: 600; }
.guide-link .arrow { color: var(--accent); }
.callout-band { background: var(--ink); color: var(--paper); padding: 60px 0; }
.callout-band .wrap { display: grid; grid-template-columns: 1fr auto; gap: 40px; align-items: center; }
.callout-band h2 { margin-bottom: 8px; max-width: 600px; }
.callout-band p { color: #c0cede; margin-bottom: 0; }
.button-link { display: inline-flex; border: 1px solid #a4b4c8; padding: 13px 18px; color: var(--paper); text-decoration: none; font-size: 13px; font-weight: 600; white-space: nowrap; }
.button-link:hover { background: var(--accent); color: white; border-color: var(--accent); }
.article-head { padding: 74px 0 45px; border-bottom: 1px solid var(--line); }
.article-head h1 { font-size: clamp(44px, 6.3vw, 70px); max-width: 870px; margin: 20px 0 18px; }
.article-head .lede { max-width: 760px; margin-bottom: 0; }
.article-meta { display: flex; gap: 18px; margin-top: 26px; font: 10px var(--mono); text-transform: uppercase; color: var(--muted); letter-spacing: .08em; }
.article-layout { display: grid; grid-template-columns: 210px minmax(0, 760px); justify-content: space-between; gap: 52px; padding: 48px 0 96px; }
.contents { align-self: start; position: sticky; top: 24px; border-top: 2px solid var(--ink); padding-top: 14px; }
.contents strong { display: block; font: 10px var(--mono); text-transform: uppercase; letter-spacing: .12em; margin-bottom: 12px; }
.contents a { display: block; padding: 5px 0; font-size: 12px; color: var(--muted); text-decoration: none; line-height: 1.45; }
.contents a:hover { color: var(--accent-dark); }
.article-content { font-size: 17px; line-height: 1.8; }
.article-content h2 { font-size: 34px; margin: 52px 0 18px; scroll-margin-top: 25px; }
.article-content h2:first-child { margin-top: 0; }
.article-content h3 { margin: 30px 0 10px; }
.article-content p { color: #40516a; }
.article-content ul, .article-content ol { padding-left: 23px; color: #40516a; }
.article-content li { padding-left: 4px; margin-bottom: 8px; }
.article-content blockquote { margin: 32px 0; padding: 18px 25px; border-left: 3px solid var(--accent); background: #e2e8f0; color: var(--ink); font: 500 22px/1.45 var(--display); }
.note-box { margin: 35px 0; background: var(--panel); padding: 22px 24px; border-left: 3px solid var(--accent); font-size: 15px; }
.note-box strong { display: block; margin-bottom: 4px; }
.page-head { padding: 76px 0 56px; border-bottom: 1px solid var(--line); }
.page-head h1 { max-width: 780px; margin: 20px 0; }
.listing { padding: 48px 0 90px; }
.listing-row { display: grid; grid-template-columns: 74px minmax(0,1fr) 170px; gap: 26px; padding: 24px 0; border-top: 1px solid var(--line); text-decoration: none; align-items: start; }
.listing-row:last-child { border-bottom: 1px solid var(--line); }
.listing-number { color: var(--accent-dark); font: 12px var(--mono); padding-top: 4px; }
.listing-row h2 { font-size: 28px; margin: 0 0 8px; }
.listing-row p { color: var(--muted); font-size: 14px; margin: 0; max-width: 650px; }
.listing-tag { font: 10px var(--mono); letter-spacing: .1em; text-transform: uppercase; color: var(--muted); text-align: right; padding-top: 8px; }
.prose-page { padding: 52px 0 95px; }
.prose-page > p, .prose-page li { color: #40516a; font-size: 17px; }
.prose-page h2 { font-size: 34px; margin-top: 46px; }
.contact-card { background: var(--panel); padding: 32px; margin: 35px 0; }
.contact-card a { font-size: clamp(18px, 3vw, 25px); font-weight: 700; text-decoration-thickness: 1px; text-underline-offset: 5px; overflow-wrap: anywhere; }
.faq-list { border-top: 1px solid var(--line); margin-top: 30px; }
.faq-item { border-bottom: 1px solid var(--line); }
.faq-item summary { cursor: pointer; font-weight: 700; padding: 18px 30px 18px 0; position: relative; list-style: none; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: "+"; position: absolute; right: 2px; top: 14px; font-size: 23px; color: var(--accent); }
.faq-item[open] summary::after { content: "−"; }
.faq-answer { padding: 0 25px 18px 0; color: var(--muted); }
.site-footer { background: var(--ink); border-top: 1px solid var(--line); padding: 48px 0 26px; color: var(--paper); }
.footer-top { display: grid; grid-template-columns: 1.15fr .85fr; gap: 70px; padding-bottom: 40px; }
.footer-brand { font-size: 18px; margin-bottom: 14px; }
.footer-note { max-width: 540px; color: #bdc9d7; font-size: 13px; line-height: 1.7; }
.footer-label { font: 10px var(--mono); color: var(--muted); text-transform: uppercase; letter-spacing: .13em; margin-bottom: 12px; }
.footer-links { display: flex; flex-wrap: wrap; gap: 9px 22px; }
.footer-links a { font-size: 13px; text-decoration: none; }
.footer-bottom { display: flex; justify-content: space-between; gap: 20px; border-top: 1px solid var(--line); padding-top: 18px; font-size: 11px; color: var(--muted); }
.footer-bottom a { color: inherit; }
.glossary-list { border-top: 1px solid var(--line); }
.glossary-entry { display: grid; grid-template-columns: 190px 1fr; gap: 30px; border-bottom: 1px solid var(--line); padding: 18px 0; }
.glossary-entry dt { font-weight: 700; }
.glossary-entry dd { color: var(--muted); margin: 0; }
.error-note { color: var(--muted); }
@media (max-width: 760px) {
  .header-inner, .wrap { width: min(100% - 36px, 1120px); }
  .header-inner { min-height: 70px; }
  .brand span:last-child { max-width: 150px; font-size: 15px; }
  .menu-toggle { display: block; cursor: pointer; }
  .nav { display: none; position: absolute; z-index: 5; top: 70px; left: 0; right: 0; padding: 18px; background: var(--paper); border-bottom: 1px solid var(--line); align-items: stretch; flex-direction: column; gap: 0; }
  .nav.is-open { display: flex; }
  .nav a { padding: 12px; border-bottom: 1px solid var(--line); }
  .nav .nav-contact { border: 0; }
  .hero-home { padding: 50px 0 52px; }
  .hero-grid { grid-template-columns: 1fr; gap: 34px; }
  .hero-visual { min-height: 310px; }
  .section { padding: 58px 0; }
  .section-heading { align-items: start; flex-direction: column; gap: 14px; }
  .feature-grid { grid-template-columns: 1fr; }
  .feature-card { min-height: 235px; padding: 24px; }
  .guide-index { grid-template-columns: 1fr; }
  .guide-link:nth-child(odd) { margin-right: 0; }
  .callout-band .wrap { grid-template-columns: 1fr; gap: 24px; }
  .article-head, .page-head { padding: 52px 0 38px; }
  .article-layout { grid-template-columns: 1fr; padding: 30px 0 70px; gap: 30px; }
  .contents { position: static; display: grid; grid-template-columns: 1fr 1fr; gap: 0 16px; }
  .contents strong { grid-column: 1 / -1; }
  .contents a { font-size: 11px; }
  .article-content { font-size: 16px; }
  .article-content h2 { font-size: 30px; margin-top: 40px; }
  .listing-row { grid-template-columns: 40px 1fr; gap: 10px 15px; }
  .listing-tag { grid-column: 2; text-align: left; padding: 0; }
  .listing-row h2 { font-size: 25px; }
  .footer-top { grid-template-columns: 1fr; gap: 28px; }
  .footer-bottom { flex-direction: column; gap: 8px; }
  .glossary-entry { grid-template-columns: 1fr; gap: 4px; }
  .strip-inner { align-items: flex-start; flex-direction: column; gap: 7px; }
}

/* Blueprint editorial: cool mineral neutrals, ink-blue fields, one electric-blue signal. */
.site-header { background: #f7f9fc; border-bottom-color: #aebdce; }
.brand { letter-spacing: -.055em; }
.brand-mark { background: var(--accent); color: #f1f4f8; font-weight: 500; }
.nav a { color: #243751; }
.nav a:hover, .nav a[aria-current="page"] { color: var(--accent); }
.nav-contact { border-color: #526781; }
.nav-contact:hover { background: var(--accent); color: #f1f4f8 !important; border-color: var(--accent); }
.hero-home { background: var(--ink); color: var(--paper); padding: 0 0 26px; }
.hero-grid { display: block; }
.hero-home .hero-grid { width: 100%; }
.hero-home .hero-grid > div:first-child { width: min(1120px, calc(100% - 56px)); margin-inline: auto; padding: 48px 0 35px; display: grid; grid-template-columns: minmax(0, 1fr) 110px; gap: 0 28px; align-items: end; }
.hero-home .eyebrow { color: #b8c8dc; grid-column: 1; }
.hero-home h1 { grid-column: 1; max-width: 950px; font: 600 clamp(54px, 8.8vw, 112px)/.94 var(--display); letter-spacing: -.085em; margin: 22px 0 18px; }
.hero-home h1 em { color: #6e9bff; font-style: normal; }
.hero-home .lede { grid-column: 1; color: #c6d2e2; font-size: 17px; max-width: 670px; margin-bottom: 4px; }
.hero-home .hero-index { grid-column: 2; grid-row: 1 / 4; align-self: center; border-left: 1px solid #52627a; padding: 12px 0 12px 18px; color: #d1dceb; font: 11px/1.8 var(--mono); letter-spacing: .08em; text-transform: uppercase; }
.hero-home .hero-index strong { display: block; font: 500 36px/1 var(--display); color: #6e9bff; letter-spacing: -.06em; }
.hero-visual { width: min(1120px, calc(100% - 56px)); height: clamp(220px, 34vw, 385px); min-height: 0; margin: 0 auto; background: #dbe2eb; border: 1px solid #70829b; }
.hero-visual::before, .hero-visual::after { display: none; }
.hero-visual img { object-position: center 68%; }
.hero-visual img[src$=".svg"] { object-fit: contain; object-position: center; }
.visual-index { top: 16px; right: 16px; background: rgba(21,36,58,.9); color: #edf2f9; padding: 7px 10px; }
.visual-note { left: 16px; bottom: 14px; color: #edf2f9; background: rgba(21,36,58,.9); padding: 7px 10px; }
.hero-home .hero-bottom { display: flex; justify-content: space-between; align-items: center; gap: 24px; padding-top: 23px; }
.hero-bottom p { margin: 0; color: #c6d2e2; font-size: 13px; }
.hero-bottom .text-link { color: #f1f4f8; }
.hero-bottom .text-link::after { color: #6e9bff; }
.editorial-strip { background: #dfe6ef; border-color: #bdc9d7; }
.strip-stamp { color: var(--accent-dark); }
.section-heading h2, .page-head h1, .article-head h1 { letter-spacing: -.065em; }
.feature-card { background: #e1e8f1; border-top: 0; border-left: 4px solid var(--accent); }
.feature-card h3 { font: 600 31px/1.1 var(--display); letter-spacing: -.05em; }
.feature-card p, .article-content p, .article-content ul, .article-content ol, .prose-page > p, .prose-page li { color: #40516a; }
.feature-card.secondary { background: #1d304a; border-left-color: #6e9bff; }
.feature-card.secondary p { color: #c0cede; }
.card-meta { color: #5c6d82; }
.feature-card.secondary .card-meta { color: #c0cede; }
.callout-band { background: #1d304a; }
.callout-band p { color: #c0cede; }
.button-link { border-color: #a4b4c8; }
.button-link:hover { background: #6e9bff; color: #15243a; border-color: #6e9bff; }
.article-head, .page-head { background: #e4eaf2; border-bottom-color: #aebdce; }
.article-meta { color: #53647a; }
.article-content blockquote { background: #e2e8f0; border-left-color: var(--accent); }
.note-box, .contact-card { background: #e2eaf5; border-left-color: var(--accent); }
.contents { border-top-color: var(--accent); }
.contents a:hover, .text-link:hover { color: var(--accent); }
.listing-row { border-color: #bdc9d7; }
.listing-row:hover { background: #e6edf5; }
.listing-tag { color: #53647a; }
.faq-item { border-color: #bdc9d7; }
.site-footer { background: #15243a; border-top: 0; color: #f1f4f8; }
.site-footer .footer-note, .site-footer .footer-bottom, .site-footer .footer-label { color: #bdc9d7; }
.site-footer .footer-links a { color: #e0e7f0; }
.site-footer .footer-links a:hover, .site-footer .footer-bottom a:hover { color: #6e9bff; }
.site-footer .footer-bottom { border-top-color: #465870; }
.site-footer .brand-mark { background: #1759e8; }
.site-footer a { overflow-wrap: anywhere; }
.nav.is-open { background: #f1f4f8; }
@media (max-width: 760px) {
  .hero-home .hero-grid > div:first-child { width: calc(100% - 36px); grid-template-columns: 1fr; padding: 36px 0 25px; }
  .hero-home .hero-index { grid-column: 1; grid-row: auto; border-left: 0; border-top: 1px solid #52627a; padding: 12px 0 0; margin-top: 18px; }
  .hero-home .hero-index strong { display: inline; font-size: 22px; margin-right: 7px; }
  .hero-home h1 { font-size: clamp(52px, 15vw, 78px); }
  .hero-visual { width: calc(100% - 36px); height: 245px; }
  .hero-home .hero-bottom { align-items: flex-start; flex-direction: column; gap: 12px; }
}