:root {
  --paper: #ffffff;
  --printer-ink: #111111;
  --oxford-ink: #071a3a;
  --reference-blue: #001a8d;
  --visited-plum: #6b2b72;
  --graphite-rule: #77736d;
  --light-rule: #d7d3cc;
  --marginalia: #56534f;
  --book-serif: "Palatino Linotype", Palatino, "Book Antiqua", Georgia, serif;
  --display-serif: "Iowan Old Style", "Baskerville", "Times New Roman", serif;
  --archive-sans: Verdana, Tahoma, Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--paper);
  color-scheme: light;
  scroll-behavior: smooth;
}

body {
  max-width: 78rem;
  margin: 0 auto;
  padding: 0.5rem clamp(1rem, 3vw, 2rem) 3rem;
  background: var(--paper);
  color: var(--printer-ink);
  font-family: var(--book-serif);
  font-size: 1.0625rem;
  line-height: 1.68;
}

.frontispiece,
main,
.book-footer {
  width: min(100%, 70ch);
  margin-inline: auto;
}

main:focus {
  outline: none;
}

section {
  scroll-margin-top: 1rem;
}

a:link {
  color: var(--reference-blue);
}

a:visited {
  color: var(--visited-plum);
}

a:hover {
  text-decoration-thickness: 0.12em;
  text-underline-offset: 0.15em;
}

a:focus-visible {
  outline: 0.16rem solid var(--reference-blue);
  outline-offset: 0.18rem;
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: 0.5rem;
  left: 0.5rem;
  padding: 0.45rem 0.65rem;
  transform: translateY(-180%);
  border: 1px solid var(--printer-ink);
  background: var(--paper);
  color: var(--printer-ink);
  font-family: var(--archive-sans);
  font-size: 0.8rem;
}

.skip-link:focus {
  transform: translateY(0);
}

hr {
  height: 0;
  border: 0;
  border-top: 1px solid var(--graphite-rule);
}

hr.end {
  width: 92%;
  margin: 0.9rem auto;
}

hr.section-rule {
  width: 28%;
  margin: 2.7rem auto 1rem;
}

.imprint,
.part-title,
.edition,
.series-nav,
.toc-label,
.contents li,
.question,
.evidence,
.principle,
.boundary,
.source-note,
.policy-instruction,
.folio-nav,
.pagenote {
  font-family: var(--archive-sans);
  text-indent: 0;
}

.imprint {
  margin: 0.25rem 0 0.4rem;
  font-size: 0.84rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  text-align: center;
}

.imprint a {
  color: var(--oxford-ink);
  text-decoration: none;
}

.series-nav {
  margin: 0.35rem auto 0.65rem;
  color: var(--marginalia);
  font-size: 0.79rem;
  line-height: 1.65;
  text-align: center;
}

.series-nav [aria-current="page"] {
  color: var(--oxford-ink);
  font-weight: 700;
  text-decoration-thickness: 0.12em;
  text-underline-offset: 0.15em;
}

.part-title {
  margin: 1rem 0 0.4rem;
  color: var(--oxford-ink);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-align: center;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  color: var(--oxford-ink);
  text-wrap: balance;
}

h1 {
  margin: 0.55rem auto 0.65rem;
  font-family: var(--display-serif);
  font-size: clamp(2rem, 5vw, 2.75rem);
  font-weight: 700;
  line-height: 1.18;
  text-align: center;
}

.edition {
  margin: 0.45rem 0 0.9rem;
  color: var(--marginalia);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  text-align: center;
}

h2 {
  margin: 0.9rem 0 0.75rem;
  text-align: center;
}

h2 .section-number {
  display: block;
  margin-bottom: 0.25rem;
  font-family: var(--archive-sans);
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.13em;
  line-height: 1.35;
  text-transform: uppercase;
}

h2 .section-title {
  display: block;
  font-family: var(--display-serif);
  font-size: clamp(1.42rem, 3vw, 1.78rem);
  line-height: 1.25;
}

h3 {
  margin: 1.35rem 7% 0.45rem;
  font-family: var(--archive-sans);
  font-size: 0.92rem;
  letter-spacing: 0.04em;
  line-height: 1.4;
  text-transform: uppercase;
}

p {
  margin: 0.8rem 4%;
  font-size: 1rem;
  line-height: 1.68;
  text-align: justify;
  text-indent: 1.25em;
  text-wrap: pretty;
  hyphens: auto;
}

section > p:first-of-type,
h3 + p,
blockquote p,
.not-found p {
  text-indent: 0;
}

dfn {
  color: var(--oxford-ink);
  font-style: normal;
  font-weight: 700;
}

.contents {
  width: min(100%, 62ch);
  margin: 1.25rem auto 2rem;
}

.toc-label {
  margin: 0 0 0.35rem;
  color: var(--oxford-ink);
  font-size: 0.79rem;
  font-weight: 700;
  letter-spacing: 0.09em;
  text-align: left;
  text-transform: uppercase;
}

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

.contents li {
  margin: 0.16rem 0;
  font-size: 0.86rem;
  font-weight: 700;
  line-height: 1.55;
}

.contents li span {
  color: var(--marginalia);
  font-size: 0.76rem;
  font-weight: 400;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

blockquote {
  width: 78%;
  margin: 1.35rem auto;
  padding: 0.72rem 0.9rem;
  border-block: 1px solid var(--light-rule);
}

blockquote p {
  margin: 0;
  font-size: 0.96rem;
  line-height: 1.55;
  text-align: left;
  hyphens: none;
}

blockquote footer {
  margin-top: 0.5rem;
  color: var(--marginalia);
  font-family: var(--archive-sans);
  font-size: 0.7rem;
  line-height: 1.45;
  text-align: right;
}

.canonical-definition {
  width: 88%;
  padding-block: 1rem;
  border-block: 3px double var(--graphite-rule);
}

.canonical-definition p {
  color: var(--oxford-ink);
  font-size: 1.02rem;
  line-height: 1.58;
  text-align: justify;
}

.question {
  margin: 0.8rem 7%;
  color: var(--oxford-ink);
  font-size: 0.88rem;
  font-weight: 700;
  line-height: 1.5;
  text-align: left;
}

.evidence,
.boundary,
.source-note,
.principle {
  margin: 1rem 7%;
  font-size: 0.81rem;
  line-height: 1.55;
  text-align: left;
}

.evidence,
.boundary,
.principle {
  color: var(--oxford-ink);
}

.source-note {
  color: var(--marginalia);
}

.principle {
  padding-left: 0.75rem;
  border-left: 0.18rem solid var(--oxford-ink);
}

.term-list {
  margin: 1rem 7% 1.25rem;
  font-size: 0.98rem;
  line-height: 1.58;
}

.term-list div {
  margin-bottom: 0.68rem;
}

.term-list dt {
  display: inline;
  color: var(--oxford-ink);
  font-family: var(--archive-sans);
  font-size: 0.83rem;
  font-weight: 700;
}

.term-list dt::after {
  content: ". ";
}

.term-list dd {
  display: inline;
  margin: 0;
}

.reading-paths div {
  margin-bottom: 1rem;
}

.compact-terms div {
  margin-bottom: 0.38rem;
}

.operating-list,
.references {
  margin: 1rem 7% 1.3rem;
  padding-left: 1.45rem;
  font-size: 0.96rem;
  line-height: 1.58;
}

.operating-list li,
.references li {
  margin-bottom: 0.58rem;
  padding-left: 0.22rem;
}

.references {
  font-size: 0.86rem;
  line-height: 1.52;
}

.note-ref,
.backlink {
  font-family: var(--archive-sans);
  font-size: 0.72rem;
  font-weight: 400;
  text-decoration: none;
}

.backlink {
  white-space: nowrap;
}

.policy-sheet {
  width: 90%;
  margin: 1.6rem auto;
  padding: 1rem 1.25rem 1.25rem;
  border-block: 3px double var(--graphite-rule);
}

.policy-sheet h3 {
  margin: 0 0 0.25rem;
  font-family: var(--display-serif);
  font-size: 1.18rem;
  letter-spacing: 0.04em;
  text-align: center;
}

.policy-instruction {
  margin: 0.25rem 0 1rem;
  color: var(--marginalia);
  font-size: 0.72rem;
  line-height: 1.45;
  text-align: center;
}

.policy-sheet dl {
  margin: 0;
}

.policy-sheet dl div {
  margin-bottom: 0.8rem;
}

.policy-sheet dt {
  color: var(--oxford-ink);
  font-family: var(--archive-sans);
  font-size: 0.76rem;
  font-weight: 700;
  line-height: 1.4;
}

.policy-sheet dd {
  min-height: 1.65rem;
  margin: 0;
}

.write-line {
  display: block;
  height: 1.55rem;
  border-bottom: 1px solid var(--graphite-rule);
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.folio-nav {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  margin: 1rem 4% 1.25rem;
  color: var(--marginalia);
  font-size: 0.77rem;
  font-weight: 700;
  line-height: 1.5;
}

.folio-nav a:last-child {
  margin-left: auto;
  text-align: right;
}

.book-footer {
  margin-top: 2.5rem;
}

.book-footer .series-nav {
  margin-top: 1.2rem;
}

.pagenote {
  margin: 0.5rem 4% 1.5rem;
  color: var(--marginalia);
  font-size: 0.68rem;
  line-height: 1.5;
  text-align: center;
}

.not-found {
  min-height: 40vh;
  padding-top: 2rem;
}

@media (max-width: 40rem) {
  body {
    padding-inline: 1rem;
    font-size: 1rem;
  }

  p {
    margin-inline: 0;
    line-height: 1.58;
    text-align: left;
    hyphens: none;
  }

  .contents,
  .term-list,
  .operating-list,
  .references,
  .question,
  .evidence,
  .boundary,
  .source-note,
  .principle {
    margin-left: 0;
    margin-right: 0;
  }

  blockquote,
  .canonical-definition,
  .policy-sheet {
    width: 100%;
  }

  .policy-sheet {
    padding-inline: 0.65rem;
  }

  .series-nav {
    font-size: 0.75rem;
  }

  .folio-nav {
    display: grid;
    grid-template-columns: 1fr;
    margin-inline: 0;
    text-align: center;
  }

  .folio-nav a:last-child {
    margin-left: 0;
    text-align: center;
  }
}

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

@page {
  margin: 0.7in 0.65in;
}

@media print {
  body {
    max-width: none;
    margin: 0;
    padding: 0;
    font-size: 10.5pt;
    line-height: 1.45;
  }

  .frontispiece,
  main,
  .book-footer {
    width: auto;
    max-width: none;
  }

  .skip-link,
  .series-nav,
  .folio-nav {
    display: none;
  }

  a:link,
  a:visited {
    color: var(--printer-ink);
  }

  p {
    font-size: 10.5pt;
    line-height: 1.45;
    orphans: 3;
    widows: 3;
  }

  h1,
  h2,
  h3 {
    break-after: avoid;
  }

  blockquote,
  .term-list div,
  .operating-list li,
  .references li,
  .policy-sheet dl div {
    break-inside: avoid;
  }

  .policy-sheet {
    break-inside: avoid-page;
  }

  .references a[href^="http"]::after {
    content: " (" attr(href) ")";
    font-size: 8pt;
    overflow-wrap: anywhere;
  }
}