:root {
  --ink: #101827;
  --ink-soft: #49566a;
  --paper: #ffffff;
  --canvas: #f4f6f8;
  --rule: #d8dee7;
  --rule-dark: #aeb8c6;
  --signal: #1466e8;
  --signal-dark: #0c48ad;
  --signal-pale: #e8f0ff;
  --warning: #b54708;
  --warning-pale: #fff4e5;
  --success: #08715c;
  --success-pale: #e8f6f1;
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
  --sans: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --site-width: 1220px;
  --reading-width: 760px;
  --shadow: 0 14px 40px rgba(16, 24, 39, .07);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.65;
  text-rendering: optimizeLegibility;
}
body.menu-is-open, body.search-is-open { overflow: hidden; }
img { max-width: 100%; height: auto; }
a { color: inherit; text-decoration-thickness: 1px; text-underline-offset: .16em; }
a:hover { color: var(--signal); }
button, input { font: inherit; }
button { cursor: pointer; }
h1, h2, h3, h4, p, ul, ol, figure { margin-top: 0; }
h1, h2, h3, h4 { color: var(--ink); line-height: 1.06; letter-spacing: -.035em; }

.site-container { width: min(calc(100% - 40px), var(--site-width)); margin-inline: auto; }
.screen-reader-text {
  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; left: 12px; top: 8px; transform: translateY(-150%); z-index: 100; background: var(--ink); color: #fff; padding: .65rem 1rem; }
.skip-link:focus { transform: translateY(0); }
.eyebrow, .eyebrow-link {
  display: inline-block; margin-bottom: .75rem; color: var(--signal); font-size: .72rem;
  font-weight: 800; letter-spacing: .13em; line-height: 1.3; text-transform: uppercase;
}
.eyebrow-link { text-decoration: none; }
.button {
  display: inline-flex; align-items: center; justify-content: center; min-height: 48px;
  padding: .7rem 1.05rem; border: 1px solid transparent; border-radius: 2px;
  font-size: .88rem; font-weight: 800; letter-spacing: .01em; text-decoration: none;
  transition: background-color .18s ease, border-color .18s ease, color .18s ease, transform .18s ease;
}
.button:hover { transform: translateY(-1px); }
.button--signal { background: var(--signal); color: #fff; }
.button--signal:hover { color: #fff; background: var(--signal-dark); }
.button--quiet { border-color: var(--rule-dark); background: transparent; color: var(--ink); }
.button--quiet:hover { border-color: var(--ink); color: var(--ink); }
.text-link { display: inline-flex; gap: .5rem; align-items: center; color: var(--ink); font-size: .88rem; font-weight: 800; text-decoration: none; }
.text-link span { color: var(--signal); font-size: 1.1rem; }

/* Header */
.site-header { position: sticky; top: 0; z-index: 50; border-bottom: 1px solid var(--rule); background: rgba(255,255,255,.96); backdrop-filter: blur(12px); }
.site-header__inner { display: flex; align-items: center; justify-content: space-between; min-height: 68px; gap: 1rem; }
.brand { display: inline-flex; align-items: center; gap: .65rem; min-width: 0; color: var(--ink); font-size: .95rem; font-weight: 850; letter-spacing: -.035em; text-decoration: none; white-space: nowrap; }
.brand:hover { color: var(--ink); }
.brand__signal { position: relative; display: flex; align-items: center; gap: 2px; width: 20px; height: 21px; }
.brand__signal::before { position: absolute; content: ""; width: 100%; height: 1px; background: var(--signal); transform: rotate(-46deg); }
.brand__signal i { position: relative; display: block; width: 5px; height: 5px; border: 1.5px solid var(--signal); border-radius: 50%; background: #fff; }
.brand__name { overflow: hidden; text-overflow: ellipsis; }
.primary-nav { position: fixed; inset: 68px 0 0; display: none; padding: 1.5rem 20px; background: var(--paper); }
.primary-nav.is-open { display: block; }
.primary-nav__list, .footer-nav { padding: 0; margin: 0; list-style: none; }
.primary-nav__list { display: grid; border-top: 1px solid var(--rule); }
.primary-nav__list li { border-bottom: 1px solid var(--rule); }
.primary-nav__list a { display: block; padding: 1rem 0; font-size: 1.06rem; font-weight: 750; text-decoration: none; }
.site-header__actions { display: flex; align-items: center; gap: .2rem; }
.header-action, .menu-toggle { display: grid; width: 38px; height: 38px; padding: 0; place-content: center; border: 0; background: transparent; color: var(--ink); }
.header-action__icon { display: block; width: 16px; height: 16px; border: 1.8px solid currentColor; border-radius: 50%; position: relative; }
.header-action__icon::after { position: absolute; right: -5px; bottom: -3px; width: 7px; height: 1.8px; content: ""; background: currentColor; transform: rotate(45deg); }
.menu-toggle { gap: 5px; }
.menu-toggle span:not(.screen-reader-text) { display: block; width: 17px; height: 1.5px; background: currentColor; transition: transform .2s ease; }
.menu-toggle.is-open span:first-child { transform: translateY(3px) rotate(45deg); }
.menu-toggle.is-open span:nth-child(2) { transform: translateY(-3px) rotate(-45deg); }
.search-panel { position: fixed; inset: 68px 0 0; z-index: 45; padding-top: 2rem; background: rgba(16,24,39,.36); }
.search-panel__inner { position: relative; padding: 1.6rem; border: 1px solid var(--rule); background: var(--paper); box-shadow: var(--shadow); }
.search-panel__inner > p { margin-bottom: 1rem; color: var(--ink-soft); font-size: .88rem; }
.search-panel__close { position: absolute; top: .75rem; right: .75rem; border: 0; background: transparent; color: var(--ink-soft); font-size: .8rem; font-weight: 750; }
.search-form { display: flex; gap: .55rem; align-items: stretch; }
.search-form__field { min-width: 0; flex: 1; border: 1px solid var(--rule-dark); border-radius: 2px; padding: .7rem .8rem; color: var(--ink); background: #fff; }
.search-form__field:focus { outline: 3px solid var(--signal-pale); border-color: var(--signal); }
.search-form .button { min-height: auto; }

/* Homepage */
.hero { overflow: hidden; border-bottom: 1px solid var(--rule); background: var(--paper); }
.hero__grid { display: grid; gap: 2.5rem; padding-top: clamp(3.75rem, 10vw, 8rem); padding-bottom: clamp(3.75rem, 10vw, 8rem); }
.hero__copy { max-width: 720px; }
.hero h1 { max-width: 720px; margin-bottom: 1.3rem; font-family: var(--serif); font-size: clamp(3rem, 11vw, 5.9rem); font-weight: 500; }
.hero__lead { max-width: 570px; margin-bottom: 1.8rem; color: var(--ink-soft); font-size: clamp(1.05rem, 2.8vw, 1.25rem); line-height: 1.6; }
.hero__actions { display: flex; flex-wrap: wrap; gap: .65rem; }
.diagram-wire { position: absolute; z-index: 2; height: 1px; background: var(--signal); transform-origin: left center; }
.diagram-wire--one { top: 34%; left: 0; width: 64%; transform: rotate(27deg); }
.diagram-wire--two { bottom: 32%; left: 24%; width: 70%; transform: rotate(-23deg); }
.diagram-node { position: absolute; z-index: 3; width: 14px; height: 14px; border: 3px solid var(--signal); border-radius: 50%; background: var(--paper); }
.diagram-node--one { top: 57%; left: 57%; }.diagram-node--two { bottom: 19%; right: 8%; }
.diagram-label { position: absolute; z-index: 3; top: 20%; left: 15%; color: var(--signal); font-family: var(--serif); font-size: 1.35rem; font-style: italic; }.diagram-label--i { top: auto; bottom: 18%; left: 20%; }
.section-space { padding-top: clamp(3.75rem, 8vw, 7rem); padding-bottom: clamp(3.75rem, 8vw, 7rem); }
.section-space--tint { background: var(--canvas); }
.section-heading { display: flex; flex-wrap: wrap; align-items: end; justify-content: space-between; gap: 1.25rem; margin-bottom: 2rem; }
.section-heading > div { max-width: 640px; }.section-heading h2 { margin-bottom: .6rem; font-family: var(--serif); font-size: clamp(2rem, 5vw, 3.25rem); font-weight: 500; }.section-heading p:not(.eyebrow) { margin-bottom: 0; color: var(--ink-soft); }
.topic-grid { display: grid; border-top: 1px solid var(--rule); border-left: 1px solid var(--rule); }
.topic-card { display: flex; min-height: 250px; flex-direction: column; padding: 1.35rem; border-right: 1px solid var(--rule); border-bottom: 1px solid var(--rule); background: #fff; transition: background-color .2s ease; }.topic-card:hover { background: var(--signal-pale); }
.topic-card__signal { margin-bottom: auto; color: var(--signal); font-size: .75rem; font-weight: 850; letter-spacing: .1em; }.topic-card h3 { margin: 2.3rem 0 .65rem; font-family: var(--serif); font-size: 1.8rem; font-weight: 500; }.topic-card p { margin-bottom: 1.25rem; color: var(--ink-soft); font-size: .91rem; }.topic-card a, .topic-card__status { margin-top: auto; color: var(--ink); font-size: .82rem; font-weight: 800; text-decoration: none; }.topic-card a span { margin-left: .4rem; color: var(--signal); }.topic-card--coming { background: #fafbfc; }.topic-card--coming:hover { background: #fafbfc; }.topic-card__status { color: var(--ink-soft); }
.article-grid { display: grid; gap: 1.75rem; }.article-card { display: flex; flex-direction: column; min-width: 0; }.article-card__media { position: relative; display: block; overflow: hidden; aspect-ratio: 1.42; border: 1px solid var(--rule); background: #eaf0f8; }.article-card__media img { display: block; width: 100%; height: 100%; object-fit: cover; }.technical-placeholder { position: relative; display: block; width: 100%; height: 100%; overflow: hidden; background: #e7effa; }.technical-placeholder::before, .technical-placeholder::after { position: absolute; width: 130%; height: 1px; content: ""; background: var(--signal); opacity: .6; transform: rotate(-31deg); }.technical-placeholder::before { top: 42%; left: -14%; }.technical-placeholder::after { top: 55%; left: -14%; opacity: .22; }.technical-placeholder span { position: absolute; z-index: 1; top: 50%; left: 50%; transform: translate(-50%,-50%); color: var(--signal); font-family: var(--serif); font-size: 4rem; }.technical-placeholder i { position: absolute; z-index: 1; width: 11px; height: 11px; border: 2px solid var(--signal); border-radius: 50%; background: #fff; }.technical-placeholder i:nth-of-type(1) { top: 24%; left: 23%; }.technical-placeholder i:nth-of-type(2) { right: 20%; bottom: 25%; }
.article-card__body { padding-top: 1rem; }.article-card h3 { margin: 0 0 .6rem; font-family: var(--serif); font-size: clamp(1.45rem, 4.6vw, 1.85rem); font-weight: 500; }.article-card h3 a { text-decoration: none; }.article-card__body > p { margin-bottom: .85rem; color: var(--ink-soft); font-size: .91rem; line-height: 1.6; }.article-card__meta { display: flex; flex-wrap: wrap; gap: .6rem; color: var(--ink-soft); font-size: .72rem; font-weight: 700; }.article-card__meta span::before { margin-right: .6rem; content: "·"; }.article-card--featured h3 { font-size: clamp(1.7rem, 5vw, 2.3rem); }.article-card--search { display: grid; grid-template-columns: 120px 1fr; gap: 1rem; padding-bottom: 1.4rem; border-bottom: 1px solid var(--rule); }.article-card--search .article-card__media { aspect-ratio: 1; }.article-card--search .article-card__body { padding-top: 0; }.article-card--search h3 { font-size: 1.35rem; }
.tools-strip { border-top: 1px solid #23314a; border-bottom: 1px solid #23314a; background: var(--ink); color: #fff; }.tools-strip__inner { display: grid; gap: 2rem; padding-top: 2.6rem; padding-bottom: 2.6rem; }.tools-strip h2 { margin-bottom: 0; color: #fff; font-family: var(--serif); font-size: clamp(2rem, 5vw, 3rem); font-weight: 500; }.tools-strip .eyebrow { color: #9fc0ff; }.tool-list { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid #47536a; border-left: 1px solid #47536a; }.tool-list span { padding: .9rem .5rem; border-right: 1px solid #47536a; border-bottom: 1px solid #47536a; color: #dbe7fb; font-size: .7rem; font-weight: 800; line-height: 1.4; text-transform: uppercase; }
.guides-callout { display: grid; gap: 1.5rem; align-items: end; }.guides-callout h2 { margin-bottom: 0; font-family: var(--serif); font-size: clamp(2.2rem, 6vw, 3.8rem); font-weight: 500; }.guides-callout > p { max-width: 430px; margin-bottom: 0; color: var(--ink-soft); }

/* Category, archive and search */
.category-hero, .archive-page__header, .search-page__header { border-bottom: 1px solid var(--rule); }.category-hero .site-container, .archive-page__header, .search-page__header { padding-top: clamp(2.7rem, 8vw, 5.5rem); padding-bottom: clamp(2.7rem, 8vw, 5rem); }.category-hero h1, .archive-page__header h1, .search-page__header h1 { max-width: 850px; margin-bottom: 1rem; font-family: var(--serif); font-size: clamp(3rem, 9vw, 5.25rem); font-weight: 500; }.category-hero p:not(.eyebrow):not(.breadcrumbs), .archive-page__header > p, .archive-description, .search-page__header > p { max-width: 630px; margin-bottom: 0; color: var(--ink-soft); font-size: 1.07rem; }.archive-page, .search-page, .page-shell { padding-top: 2rem; padding-bottom: clamp(4rem, 9vw, 8rem); }.archive-page__header, .search-page__header { margin-bottom: 2.25rem; }.search-page__header .search-form { max-width: 650px; margin-top: 1.6rem; }.results-count { margin: 0 0 1.5rem; color: var(--ink-soft); font-size: .85rem; font-weight: 700; }.search-results { display: grid; gap: 1.35rem; max-width: 860px; }
.breadcrumbs { display: flex; gap: .5rem; overflow: hidden; margin-bottom: 1.5rem; color: var(--ink-soft); font-size: .73rem; font-weight: 750; white-space: nowrap; }.breadcrumbs span:last-child { overflow: hidden; text-overflow: ellipsis; }.breadcrumbs a { color: var(--ink-soft); text-decoration: none; }.breadcrumbs a:hover { color: var(--signal); }.pagination { display: flex; gap: .4rem; justify-content: center; margin-top: 3rem; }.pagination .page-numbers { min-width: 38px; padding: .4rem .7rem; border: 1px solid var(--rule); color: var(--ink); font-size: .82rem; font-weight: 800; text-align: center; text-decoration: none; }.pagination .current { border-color: var(--signal); background: var(--signal); color: #fff; }

/* Article reading experience */
.single-page { padding-top: 2.3rem; padding-bottom: clamp(4.5rem, 10vw, 8rem); }.single-page__shell { max-width: 1100px; }.technical-article { max-width: var(--reading-width); margin-inline: auto; }.article-header { margin-bottom: 2.3rem; }.article-header h1 { margin-bottom: 1.1rem; font-family: var(--serif); font-size: clamp(2.7rem, 9vw, 5.2rem); font-weight: 500; }.article-header__intro { max-width: 680px; margin-bottom: 1.35rem; color: var(--ink-soft); font-family: var(--serif); font-size: clamp(1.15rem, 3.3vw, 1.45rem); line-height: 1.5; }.entry-meta { display: flex; flex-wrap: wrap; gap: .45rem; color: var(--ink-soft); font-size: .78rem; font-weight: 700; }.article-featured-image { width: min(100%, 1000px); margin: 0 auto 2.5rem; }.article-featured-image img { display: block; width: 100%; border: 1px solid var(--rule); }.article-layout { position: relative; }.article-toc { margin: 0 0 2rem; padding: 1rem 1.1rem; border-left: 2px solid var(--signal); background: var(--canvas); }.article-toc p { margin-bottom: .55rem; font-size: .73rem; font-weight: 850; letter-spacing: .1em; text-transform: uppercase; }.article-toc ol { margin: 0; padding-left: 1.1rem; }.article-toc li { margin-bottom: .25rem; padding-left: .1rem; }.article-toc a { color: var(--ink-soft); font-size: .86rem; text-decoration: none; }.article-toc a:hover { color: var(--signal); }.entry-content { font-size: 1.05rem; line-height: 1.78; }.entry-content > * { max-width: var(--reading-width); }.entry-content p, .entry-content ul, .entry-content ol { margin-bottom: 1.35rem; }.entry-content h2 { margin-top: 3.2rem; margin-bottom: 1rem; padding-top: .25rem; font-family: var(--serif); font-size: clamp(1.9rem, 5vw, 2.55rem); font-weight: 500; }.entry-content h3 { margin-top: 2.25rem; margin-bottom: .85rem; font-family: var(--serif); font-size: clamp(1.45rem, 4vw, 1.8rem); font-weight: 500; }.entry-content h4 { margin-top: 1.7rem; font-size: 1.1rem; }.entry-content a { color: var(--signal-dark); font-weight: 700; }.entry-content strong { color: var(--ink); }.entry-content blockquote { margin: 2rem 0; padding: .5rem 0 .5rem 1.25rem; border-left: 3px solid var(--signal); color: var(--ink-soft); font-family: var(--serif); font-size: 1.35rem; line-height: 1.45; }.entry-content figure { margin: 2rem 0; }.entry-content figcaption { margin-top: .55rem; color: var(--ink-soft); font-size: .8rem; }.entry-content .wp-block-embed { margin: 2.4rem 0; }.entry-content .wp-block-embed iframe { max-width: 100%; }.entry-content .wp-block-table { width: 100%; margin: 2rem 0; overflow-x: auto; border: 1px solid var(--rule); }.entry-content table { width: 100%; min-width: 560px; border-collapse: collapse; font-size: .9rem; }.entry-content th { background: var(--ink); color: #fff; text-align: left; }.entry-content th, .entry-content td { padding: .75rem; border-right: 1px solid var(--rule); border-bottom: 1px solid var(--rule); }.entry-content tr:nth-child(even) td { background: var(--canvas); }.entry-content .wp-block-math, .entry-content math { display: block; max-width: 100%; overflow-x: auto; margin: 1.8rem 0; padding: 1rem 1.15rem; border: 1px solid #b8cef8; background: var(--signal-pale); color: var(--signal-dark); }
.technical-note { margin: 2rem 0; padding: 1.1rem 1.15rem; border: 1px solid var(--rule); border-left: 3px solid var(--signal); background: #fff; }.technical-note__title { margin-bottom: .45rem; font-size: .77rem; font-weight: 850; letter-spacing: .07em; text-transform: uppercase; }.technical-note__content > :last-child { margin-bottom: 0; }.technical-note--warning { border-left-color: var(--warning); background: var(--warning-pale); }.technical-note--warning .technical-note__title { color: var(--warning); }.technical-note--tip { border-left-color: var(--success); background: var(--success-pale); }.technical-note--tip .technical-note__title { color: var(--success); }.technical-note--example { border-left-color: #7a4cb8; background: #f5efff; }.technical-note--example .technical-note__title { color: #6336a0; }.formula-box { margin: 2rem 0; padding: 1.3rem; border: 1px solid #b8cef8; background: var(--signal-pale); }.formula-box__eyebrow { margin-bottom: .75rem; color: var(--signal-dark); font-size: .72rem; font-weight: 850; letter-spacing: .1em; text-transform: uppercase; }.formula-box__expression { overflow-x: auto; color: var(--signal-dark); font-family: var(--serif); font-size: clamp(1.4rem, 4vw, 2rem); text-align: center; }.calculation-result { display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: .7rem; margin: 1.5rem 0; padding: 1rem 1.1rem; border: 1px solid var(--ink); background: var(--ink); color: #fff; }.calculation-result span { color: #b9d1ff; font-size: .75rem; font-weight: 800; letter-spacing: .1em; text-transform: uppercase; }.calculation-result strong { font-family: var(--serif); font-size: 1.6rem; font-weight: 500; }.related-articles { margin-top: clamp(4rem, 9vw, 7rem); padding-top: 3rem; border-top: 1px solid var(--rule); }

/* Pages, empty state, footer */
.standard-page { max-width: var(--reading-width); margin-inline: auto; }.standard-page__header h1, .not-found h1 { margin-bottom: 2rem; font-family: var(--serif); font-size: clamp(2.7rem, 8vw, 4.5rem); font-weight: 500; }.empty-state, .not-found { max-width: 700px; padding-top: clamp(4rem, 10vw, 8rem); padding-bottom: clamp(5rem, 12vw, 10rem); }.empty-state h2 { font-family: var(--serif); font-size: 2.4rem; font-weight: 500; }.empty-state p, .not-found > p:not(.eyebrow) { max-width: 560px; color: var(--ink-soft); }.not-found .search-form { max-width: 620px; margin: 2rem 0 1rem; }.not-found .button { margin-top: 1rem; }
.site-footer { border-top: 1px solid var(--rule); background: #f0f3f7; }.site-footer__grid { display: grid; gap: 2.5rem; padding-top: 3.5rem; padding-bottom: 2.7rem; }.footer-intro { max-width: 330px; }.footer-intro__mark { margin-bottom: 1rem; color: var(--signal); font-size: .8rem; font-weight: 850; letter-spacing: .12em; }.footer-intro h2, .site-footer h2 { margin-bottom: .6rem; font-family: var(--serif); font-size: 1.5rem; font-weight: 500; }.footer-intro p:not(.footer-intro__mark) { margin-bottom: 0; color: var(--ink-soft); font-size: .88rem; }.site-footer h2 { font-family: var(--sans); font-size: .76rem; font-weight: 850; letter-spacing: .1em; text-transform: uppercase; }.footer-library ul, .footer-nav { display: grid; gap: .4rem; list-style: none; }.footer-library a, .footer-nav a { color: var(--ink-soft); font-size: .86rem; text-decoration: none; }.footer-library a:hover, .footer-nav a:hover { color: var(--signal); }.site-footer__bottom { display: flex; flex-wrap: wrap; justify-content: space-between; gap: .4rem 1rem; padding-top: 1.1rem; padding-bottom: 1.1rem; border-top: 1px solid var(--rule); color: var(--ink-soft); font-size: .72rem; }.site-footer__bottom p { margin: 0; }

@media (min-width: 640px) {
  .site-container { width: min(calc(100% - 64px), var(--site-width)); }
  .topic-grid { grid-template-columns: repeat(2, 1fr); }.article-grid--three { grid-template-columns: repeat(2, 1fr); }.article-grid--featured, .article-grid--feature-pair { grid-template-columns: repeat(2, 1fr); }.article-grid--featured .article-card:first-child { grid-column: 1 / -1; }.tools-strip__inner { grid-template-columns: 1fr 1fr; align-items: center; }.guides-callout { grid-template-columns: 1.3fr .7fr; }.site-footer__grid { grid-template-columns: 1.5fr 1fr 1fr; }.article-card--search { grid-template-columns: 170px 1fr; }
}

@media (min-width: 900px) {
  body { font-size: 16.5px; }.site-header__inner { min-height: 76px; }.brand { font-size: 1.05rem; }.primary-nav { position: static; display: block; padding: 0; background: transparent; }.primary-nav__list { display: flex; align-items: center; gap: clamp(.8rem, 1.7vw, 1.6rem); border: 0; }.primary-nav__list li { border: 0; }.primary-nav__list a { padding: .4rem 0; font-size: .79rem; font-weight: 780; letter-spacing: -.01em; }.menu-toggle { display: none; }.search-panel { inset: 76px 0 0; padding-top: 2.5rem; }.search-panel__inner { display: grid; grid-template-columns: 1fr auto; align-items: center; gap: .5rem 2rem; max-width: 780px; }.search-panel__inner > p { grid-column: 1; margin: 0; }.search-panel .search-form { grid-column: 1; }.search-panel__close { position: static; grid-column: 2; grid-row: 1 / 3; }
  .hero__grid { grid-template-columns: minmax(0, 1.35fr) minmax(320px, .65fr); align-items: center; }.topic-grid { grid-template-columns: repeat(4, 1fr); }.article-grid--three { grid-template-columns: repeat(3, 1fr); }.article-grid--featured { grid-template-columns: 1.2fr .9fr .9fr; }.article-grid--featured .article-card:first-child { grid-column: auto; }.article-grid--feature-pair { grid-template-columns: repeat(2, 1fr); }.article-grid--feature-pair .article-card h3 { font-size: 2.15rem; }.article-card--search { grid-template-columns: 210px 1fr; }.category-hero .site-container { display: grid; grid-template-columns: 1fr minmax(0, .7fr); align-items: end; }.category-hero .breadcrumbs, .category-hero .eyebrow, .category-hero h1 { grid-column: 1; }.category-hero p:not(.eyebrow):not(.breadcrumbs) { grid-column: 2; grid-row: 2 / span 2; padding-bottom: .65rem; }.single-page__shell { max-width: 1160px; }.article-header, .technical-article, .article-featured-image { margin-left: 0; }.article-layout { max-width: var(--reading-width); }.site-footer__grid { grid-template-columns: 1.5fr 1fr 1fr; }
}

@media (min-width: 1180px) {
  .article-card--featured:first-child h3 { font-size: 2.55rem; }
}

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

/* Los artículos sin imagen usan una retícula técnica plana, no una ilustración decorativa. */
.technical-placeholder { background: #e7effa; }

/* Fase 2.5 — la portada prioriza la biblioteca y reduce el lenguaje de landing. */
.hero__grid {
  gap: 1.5rem;
  padding-top: clamp(2.7rem, 6.5vw, 5.3rem);
  padding-bottom: clamp(2.7rem, 6.5vw, 5.3rem);
}
.hero h1 { max-width: 650px; font-size: clamp(2.75rem, 7.2vw, 4.85rem); }
.hero__lead { max-width: 540px; margin-bottom: 1.35rem; font-size: clamp(1rem, 2.3vw, 1.15rem); }
.hero__circuit {
  position: relative;
  display: grid;
  min-height: 225px;
  overflow: hidden;
  place-items: center;
  border: 1px solid var(--rule);
  background: var(--canvas);
}
.hero__circuit svg { display: block; width: 100%; max-width: 560px; padding: 1rem; }
.hero__circuit p {
  position: absolute;
  right: 1rem;
  bottom: .65rem;
  margin: 0;
  color: var(--ink-soft);
  font-size: .65rem;
  font-weight: 850;
  letter-spacing: .11em;
  text-transform: uppercase;
}
.hero__circuit .circuit-wire,
.hero__circuit .circuit-resistor,
.hero__circuit .circuit-lamp,
.hero__circuit .circuit-lamp-mark,
.hero__circuit .circuit-battery {
  fill: none;
  stroke: var(--ink);
  stroke-linecap: square;
  stroke-linejoin: miter;
  stroke-width: 3;
}
.hero__circuit .circuit-resistor,
.hero__circuit .circuit-lamp-mark,
.hero__circuit .circuit-battery { stroke: var(--signal); }
.hero__circuit .circuit-node { fill: var(--signal); }
.hero__circuit text { fill: var(--ink-soft); font-family: var(--sans); font-size: 11px; font-weight: 800; letter-spacing: 1.2px; }
.hero__circuit .circuit-equation { fill: var(--signal-dark); font-family: var(--serif); font-size: 25px; font-weight: 500; letter-spacing: 0; }

.section-space { padding-top: clamp(2.8rem, 6vw, 4.9rem); padding-bottom: clamp(2.8rem, 6vw, 4.9rem); }
.section-heading { margin-bottom: 1.55rem; }
.section-space--latest { padding-top: clamp(2.5rem, 5vw, 4.1rem); }
.topic-grid { grid-template-columns: repeat(auto-fit, minmax(205px, 1fr)); }
.topic-card { min-height: 215px; padding: 1.2rem; }
.topic-card h3 { margin-top: 1.65rem; font-size: 1.6rem; }

.article-grid--latest { gap: 1.35rem; }
.article-card--latest h3 { font-size: clamp(1.45rem, 4vw, 1.8rem); }
.article-card--latest:first-child h3 { font-size: clamp(1.9rem, 5.4vw, 2.5rem); }
.article-card__media img { transition: none; }
.article-card:hover .article-card__media img { transform: none; }
.technical-placeholder { background: #e7effa; }

.tools-strip__inner { gap: 1.6rem; padding-top: 2.25rem; padding-bottom: 2.25rem; }
.tools-strip h2 { margin-bottom: .7rem; font-size: clamp(1.85rem, 4.6vw, 2.7rem); }
.tools-strip__inner > div > p:not(.eyebrow) { max-width: 490px; margin-bottom: 0; color: #c6d5ee; font-size: .9rem; }
.tool-list { grid-template-columns: repeat(2, 1fr); }
.tool-list span { padding: .8rem .55rem; }

@media (min-width: 640px) {
  .article-grid--latest { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 900px) {
  .hero__grid { grid-template-columns: minmax(0, 1.25fr) minmax(350px, .75fr); }
  .hero__circuit { min-height: 280px; }
  .article-grid--latest { grid-template-columns: repeat(4, 1fr); align-items: start; }
  .article-grid--latest .article-card:first-child { grid-column: span 2; grid-row: span 2; }
  .article-grid--latest .article-card:first-child .article-card__media { aspect-ratio: 1.48; }
  .article-grid--latest .article-card:first-child .article-card__body { padding-top: 1.15rem; }
  .article-grid--latest .article-card:first-child .article-card__body > p { font-size: .98rem; }
  .tool-list { grid-template-columns: repeat(3, 1fr); }
}

/* Estabilización 3.2: el índice se vuelve lateral solo cuando cabe sin forzar la lectura. */
.single-page { overflow-x: hidden; }
.related-articles { width: 100%; max-width: var(--site-width); margin-left: 0; }

@media (min-width: 900px) and (max-width: 1179px) {
  .article-layout { display: block; max-width: var(--reading-width); }
  .article-toc { position: static; width: auto; margin: 0 0 2rem; }
}

@media (min-width: 1180px) {
  .technical-article { max-width: 100%; }
  .article-header,
  .article-featured-image { width: 100%; max-width: var(--reading-width); margin-left: 0; }
  .article-layout {
    display: grid;
    grid-template-columns: minmax(0, var(--reading-width)) minmax(160px, 185px);
    gap: clamp(1.5rem, 3vw, 3rem);
    max-width: 1020px;
    align-items: start;
  }
  .article-layout .entry-content { grid-column: 1; min-width: 0; }
  .article-toc {
    position: sticky;
    top: 100px;
    grid-column: 2;
    grid-row: 1;
    width: 100%;
    margin: 0;
    padding: 1rem;
    border: 1px solid var(--rule);
    border-left: 2px solid var(--signal);
    background: var(--canvas);
  }
  .article-toc p { padding-bottom: .55rem; border-bottom: 1px solid var(--rule); }
  .article-toc ol { padding-left: 1rem; list-style: decimal; }
  .article-toc li { padding-left: .1rem; }
}