:root {
  --paper: #f3f5f8;
  --paper-raised: #ffffff;
  --ink: #111a24;
  --muted: #45505d;
  --line: #d3dae3;
  --teal: #0f2c4c;
  --teal-mid: #12528c;
  --copper: #c2410c;
  --copper-soft: #fff1e7;
  --stop: #9b1c1c;
  --stop-soft: #fdecec;
  --blue: #1d4e89;
  --max: 72rem;
  --measure: 45rem;
  --serif: "Space Grotesk", "Segoe UI", Roboto, Arial, sans-serif;
  --sans: "IBM Plex Sans", "Segoe UI", Roboto, Arial, sans-serif;
}

*,
*::before,
*::after { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 1.0625rem;
  line-height: 1.65;
}

img { max-width: 100%; height: auto; }

a { color: var(--teal-mid); text-underline-offset: 0.16em; }

a:hover { color: var(--copper); }

:focus-visible {
  outline: 3px solid var(--copper);
  outline-offset: 3px;
}

.skip {
  position: absolute;
  left: 0.75rem;
  top: -4rem;
  background: var(--ink);
  color: var(--paper);
  padding: 0.5rem 0.8rem;
  z-index: 5;
}

.skip:focus { top: 0.75rem; color: var(--paper); }

.wrap {
  width: min(var(--max), calc(100% - 2rem));
  margin-inline: auto;
}

.site-header {
  border-bottom: 4px solid var(--teal);
  background: var(--paper-raised);
  background-image: linear-gradient(90deg, var(--copper) 0 10px, transparent 10px);
}

.header-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem 1.5rem;
  padding: 0.9rem 0;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  color: inherit;
  text-decoration: none;
}

.brand img { display: block; }

.brand-name {
  display: block;
  font-family: var(--serif);
  font-weight: 620;
  letter-spacing: -0.02em;
  font-size: 1.35rem;
  line-height: 1;
  color: var(--teal);
}

.brand-mark { display: block; flex: none; }

.brand-tag {
  display: block;
  color: var(--muted);
  font-size: 0.86rem;
  line-height: 1.3;
}

.nav-primary ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 0.9rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-primary a {
  font-family: var(--sans);
  font-size: 0.92rem;
  color: var(--ink);
  text-decoration: none;
}

.nav-primary a:hover,
.nav-primary a[aria-current="page"] {
  color: var(--copper);
  text-decoration: underline;
}

main { padding: 1.25rem 0 3rem; }

.crumbs {
  font-family: var(--sans);
  font-size: 0.82rem;
  color: var(--muted);
  margin: 0 0 1rem;
}

.crumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 0.3rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.crumbs li:not(:last-child)::after {
  content: "/";
  margin-left: 0.3rem;
  color: var(--line);
}

.article-head { max-width: var(--measure); }

.kicker {
  font-family: var(--sans);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--copper);
  margin: 0 0 0.4rem;
}

.kicker a { color: inherit; }

h1, h2, h3 { font-family: var(--serif); }

h1 {
  font-size: clamp(2rem, 4.4vw, 3.1rem);
  line-height: 1.08;
  font-weight: 620;
  margin: 0 0 0.6rem;
  letter-spacing: -0.03em;
}

.byline,
.dek {
  color: var(--muted);
  margin: 0.2rem 0;
}

.dek { font-size: 1.12rem; color: var(--ink); max-width: 38rem; }

.toc {
  max-width: var(--measure);
  background: var(--paper-raised);
  border: 1px solid var(--line);
  border-left: 4px solid var(--teal);
  padding: 0.8rem 1rem 0.9rem;
  margin: 1.3rem 0 1.5rem;
}

.toc strong {
  font-family: var(--sans);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.toc ol { margin: 0.4rem 0 0; padding-left: 1.2rem; }

.toc a { text-decoration: none; }

.toc a:hover { text-decoration: underline; }

.prose { max-width: var(--measure); }

.prose h2 {
  font-size: 1.45rem;
  line-height: 1.25;
  margin: 2rem 0 0.6rem;
  padding-top: 0.4rem;
  border-top: 1px solid var(--line);
}

.prose h3 {
  font-size: 1.15rem;
  margin: 1.4rem 0 0.4rem;
  color: var(--teal);
}

.prose p,
.prose ul,
.prose ol { margin: 0.7rem 0; }

.prose ul,
.prose ol { padding-left: 1.25rem; }

.prose li + li { margin-top: 0.28rem; }

.table-scroll {
  overflow-x: auto;
  margin: 1rem 0 1.2rem;
  border: 1px solid var(--line);
  background: var(--paper-raised);
}

figure.table-scroll { margin: 1rem 0 1.2rem; }

.prose table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
  line-height: 1.45;
}

.prose caption {
  caption-side: top;
  text-align: left;
  font-family: var(--sans);
  font-size: 0.82rem;
  font-weight: 650;
  padding: 0.65rem 0.75rem 0.35rem;
  color: var(--ink);
}

.prose th,
.prose td {
  text-align: left;
  vertical-align: top;
  padding: 0.55rem 0.7rem;
  border-top: 1px solid var(--line);
}

.prose th {
  background: var(--teal);
  color: #f6f3ec;
  font-family: var(--sans);
  font-size: 0.82rem;
  font-weight: 650;
  border-top: 0;
}

.callout {
  margin: 1.1rem 0;
  padding: 0.8rem 1rem;
  background: var(--copper-soft);
  border-left: 4px solid var(--copper);
  color: var(--ink);
}

.callout-stop {
  background: var(--stop-soft);
  border-left-color: var(--stop);
}

.callout p:first-child { margin-top: 0; }
.callout p:last-child { margin-bottom: 0; }

.related,
.guide-index,
.card-grid { margin-top: 2.2rem; }

.related h2,
.guide-index h2,
.band h2 {
  font-size: 1.3rem;
  margin-bottom: 0.6rem;
}

.link-list,
.guide-index ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.link-list li,
.guide-index li {
  border-top: 1px solid var(--line);
  padding: 0.75rem 0;
}

.link-list a,
.guide-index a {
  font-weight: 650;
  text-decoration: none;
}

.link-list p,
.guide-index p {
  margin: 0.2rem 0 0;
  color: var(--muted);
}

.card-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.8rem;
}

.card {
  display: block;
  background: var(--paper-raised);
  border: 1px solid var(--line);
  padding: 0.95rem 1rem 1rem;
  text-decoration: none;
  color: inherit;
}

.card:hover { border-color: var(--copper); }

.card span {
  font-family: var(--sans);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--copper);
}

.card strong { display: block; font-size: 1.15rem; margin: 0.2rem 0; }

.card p { margin: 0; color: var(--muted); }

.site-footer {
  border-top: 1px solid var(--line);
  background: var(--teal);
  color: #efeae1;
  padding: 1.5rem 0 2rem;
  font-size: 0.95rem;
}

.site-footer a { color: #f3efe4; }

.footer-grid {
  display: grid;
  gap: 1rem;
}

.footer-nav { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 0.4rem 1rem; }

.footer-nav a { font-family: var(--sans); font-size: 0.88rem; }

.fine {
  color: #d9d3c7;
  max-width: 42rem;
  margin: 0.4rem 0 0;
}

@media (min-width: 720px) {
  .card-grid { grid-template-columns: 1fr 1fr; }
  .footer-grid { grid-template-columns: 1.4fr 1fr; align-items: start; }
}

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

.diagram {
  margin: 1.2rem 0 1.4rem;
  background: var(--paper-raised);
  border: 1px solid var(--line);
  border-left: 6px solid var(--copper);
}

.diagram img {
  display: block;
  width: 100%;
  height: auto;
  background: #f3ead7;
}

.diagram figcaption {
  font-family: var(--sans);
  font-size: 0.92rem;
  padding: 0.55rem 0.8rem 0.7rem;
  color: var(--muted);
}

.plate {
  border: 1px solid var(--teal);
  background: var(--paper-raised);
  padding: 0.9rem 1rem 1rem;
  margin: 1rem 0 1.4rem;
}

.plate ol {
  list-style: none;
  margin: 0;
  padding: 0;
}

.plate li {
  border-top: 1px solid var(--line);
  padding: 0.55rem 0;
}

.plate li:first-child { border-top: 0; }

.plate a {
  display: grid;
  grid-template-columns: 2.2rem 1fr;
  gap: 0.4rem 0.7rem;
  text-decoration: none;
  color: inherit;
  align-items: baseline;
}

.plate a strong { font-family: var(--serif); font-size: 1.15rem; font-weight: 620; }

.plate .num {
  font-family: var(--serif);
  color: var(--copper);
  font-weight: 700;
}

.plate em {
  grid-column: 2;
  font-style: normal;
  color: var(--muted);
  font-size: 0.95rem;
}

@media print {
  .site-header, .site-footer, .toc, .skip, .related, .card-grid { display: none; }
  body { background: white; }
  a { color: black; }
}

/* ===== Identity + polish, 2026-11-01: geometric badge, steel navy and signal orange, Space Grotesk + IBM Plex Sans ===== */
.site-header {
  background: var(--teal);
  background-image: none;
  border-bottom: 4px solid var(--copper);
  color: #ffffff;
}
.header-inner { padding: 0.85rem 0; }
.brand-name {
  font-family: var(--serif);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-size: 1.2rem;
  color: #ffffff;
}
.brand-tag { color: #c9d5e2; font-size: 0.84rem; margin-top: 0.2rem; }
.nav-primary a {
  font-family: var(--serif);
  font-weight: 600;
  font-size: 0.86rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #ffffff;
  padding: 0.35rem 0;
  border-bottom: 3px solid transparent;
}
.nav-primary a:hover,
.nav-primary a[aria-current="page"] { color: #ffffff; text-decoration: none; border-bottom-color: #f59e5b; }
:focus-visible { outline-color: #f59e5b; }
h1, h2, h3 { font-weight: 700; letter-spacing: -0.015em; }
h1 { letter-spacing: -0.025em; font-weight: 700; }
.kicker { font-family: var(--serif); font-weight: 600; letter-spacing: 0.14em; }
.byline { font-size: 0.92rem; }
.prose h2 { border-top: 0; padding-top: 0; margin-top: 2.2rem; }
.prose h2::before { content: ""; display: block; width: 2.4rem; height: 4px; background: var(--copper); margin-bottom: 0.55rem; }
.prose h3 { color: var(--teal); }
.toc {
  background: #ffffff;
  border: 1px solid var(--line);
  border-top: 4px solid var(--teal);
  border-left: 1px solid var(--line);
}
.toc strong { font-family: var(--serif); color: var(--copper); }
.plate { background: #ffffff; border: 1px solid var(--line); border-top: 4px solid var(--teal); }
.plate a strong { font-family: var(--serif); font-weight: 700; }
.plate .num {
  display: inline-grid; place-items: center;
  width: 2rem; height: 2rem;
  background: var(--teal); color: #ffffff;
  font-family: var(--serif); font-size: 0.9rem;
  clip-path: polygon(25% 0, 75% 0, 100% 50%, 75% 100%, 25% 100%, 0 50%);
}
.plate a:hover strong { color: var(--copper); }
.callout { border-left-width: 6px; }
.diagram { border-left: 1px solid var(--line); border-top: 4px solid var(--copper); background: #ffffff; }
.diagram img { background: #f3f5f8; }
.table-scroll { background: #ffffff; }
.link-list li, .guide-index li { border-top: 1px solid var(--line); }
.link-list a, .guide-index a { font-family: var(--serif); font-weight: 600; }
.site-footer { background: #0b1f36; border-top: 4px solid var(--copper); color: #e3e9f0; }
.site-footer strong { font-family: var(--serif); letter-spacing: 0.04em; }
.fine { color: #b9c6d4; }
.footer-nav a { font-family: var(--serif); letter-spacing: 0.04em; }
/* Reading column: centered at a 45rem measure instead of hugging the left edge */
main.wrap > *, main.wrap > article > * { max-width: var(--measure); margin-left: auto; margin-right: auto; }
main.wrap > article { max-width: none; }
.toc { margin-left: auto; margin-right: auto; }
.dek { max-width: none; }

/* ===== Readability pass, 2026-11-01: article rhythm, summary dek, section dividers, in-place pull quote ===== */
article[data-kind="article"] .dek {
  background: #ffffff;
  border: 1px solid var(--line);
  border-left: 6px solid var(--copper);
  padding: 0.85rem 1.1rem;
  margin: 1rem auto 0.6rem;
  font-size: 1.1rem;
  line-height: 1.55;
}
article[data-kind="article"] .prose { line-height: 1.78; }
article[data-kind="article"] .prose p { margin: 0 0 1.2rem; }
article[data-kind="article"] .prose h2 {
  position: relative;
  margin: 3.2rem 0 1rem;
  padding-top: 1.7rem;
  border-top: 1px solid var(--line);
  font-size: 1.6rem;
  line-height: 1.2;
  color: var(--teal);
}
article[data-kind="article"] .prose h2::before {
  position: absolute;
  top: -3px;
  left: 0;
  margin: 0;
  width: 3.2rem;
  height: 5px;
}
article[data-kind="article"] .prose h3 {
  display: flex;
  align-items: baseline;
  gap: 0.55rem;
  margin: 2rem 0 0.6rem;
  font-size: 1.2rem;
  color: var(--teal);
}
article[data-kind="article"] .prose h3::before {
  content: "";
  flex: none;
  width: 0.6rem;
  height: 0.6rem;
  background: var(--copper);
  clip-path: polygon(25% 0, 75% 0, 100% 50%, 75% 100%, 25% 100%, 0 50%);
}
article[data-kind="article"] .prose ul,
article[data-kind="article"] .prose ol { margin: 0 0 1.3rem; }
article[data-kind="article"] .prose li + li { margin-top: 0.45rem; }
.prose .pull-quote {
  margin: 2.2rem 0;
  padding: 1.1rem 0 1.1rem 1.4rem;
  border-left: 6px solid var(--teal);
  background: linear-gradient(90deg, #ffffff, rgba(255, 255, 255, 0));
  font-family: var(--serif);
  font-size: 1.42rem;
  font-weight: 600;
  line-height: 1.38;
  letter-spacing: -0.01em;
  color: var(--teal);
}
@media (max-width: 40rem) {
  article[data-kind="article"] .prose h2 { font-size: 1.4rem; }
  .prose .pull-quote { font-size: 1.24rem; }
}
.prose a { overflow-wrap: anywhere; }