:root {
  color-scheme: light;
  --ink: #172033;
  --muted: #526079;
  --paper: #ffffff;
  --wash: #f4f7fb;
  --line: #cbd5e1;
  --accent: #075985;
  --accent-dark: #0c4a6e;
  --accent-soft: #e0f2fe;
  --note: #fff7d6;
  --example: #eefbf3;
  --solution: #f2efff;
  font-family: "Segoe UI", Arial, sans-serif;
  font-size: 17px;
  line-height: 1.62;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--wash);
  color: var(--ink);
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 18rem;
  background: var(--wash);
}

a {
  color: var(--accent);
  text-decoration-thickness: 0.09em;
  text-underline-offset: 0.16em;
}

a:hover {
  color: var(--accent-dark);
}

a:focus-visible,
summary:focus-visible,
.table-scroll:focus-visible {
  outline: 3px solid #f59e0b;
  outline-offset: 3px;
}

.site-header,
.compact-header {
  color: #ffffff;
  background: linear-gradient(135deg, #0c4a6e, #075985 60%, #0369a1);
}

.site-header-inner,
.compact-header > a {
  display: block;
  width: min(100% - 2rem, 84rem);
  margin-inline: auto;
}

.site-header-inner {
  padding-block: 3.5rem 3rem;
}

.compact-header > a {
  padding-block: 0.85rem;
  color: #ffffff;
  font-weight: 700;
  text-decoration: none;
}

.site-header h1 {
  max-width: 24ch;
  margin: 0;
  font-size: clamp(2.25rem, 5vw, 4.75rem);
  line-height: 1.04;
}

.eyebrow {
  margin: 0 0 0.65rem;
  color: #bae6fd;
  font-size: 0.88rem;
  font-weight: 800;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.lede {
  max-width: 62ch;
  margin: 1rem 0 0;
  color: #e0f2fe;
  font-size: 1.12rem;
}

.page-shell {
  width: min(100% - 2rem, 84rem);
  margin: 1.25rem auto 3rem;
  padding: clamp(1rem, 3vw, 2.5rem);
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 0.8rem;
  box-shadow: 0 0.8rem 2.4rem rgb(15 23 42 / 8%);
}

.edition-notice {
  width: min(100% - 2rem, 84rem);
  margin: 1rem auto 0;
  padding: 0.8rem 1rem;
  border: 1px solid #bae6fd;
  border-inline-start: 0.35rem solid #0284c7;
  border-radius: 0.5rem;
  color: #0c4a6e;
  background: #f0f9ff;
  font-size: 0.94rem;
  line-height: 1.5;
}

.paired-access {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem 1.5rem;
  align-items: center;
  width: min(100% - 2rem, 84rem);
  margin: 1rem auto;
  padding: 0.9rem 1rem;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 0.5rem;
}

.original-source-link {
  font-weight: 800;
}

.page-shell main,
.module {
  min-width: 0;
}

.module > h1 {
  width: min(100%, 28ch);
  max-width: 28ch;
  margin: 0 auto 1.25rem;
  font-size: clamp(2rem, 4vw, 3.5rem);
  line-height: 1.08;
  text-align: center;
}

.module h2,
.module h3,
.module h4,
.module h5,
.module h6 {
  width: min(100%, 78ch);
  margin-inline: auto;
}

h2,
h3,
h4,
h5,
h6 {
  margin-block: 1.75em 0.6em;
  line-height: 1.18;
}

h2 {
  font-size: clamp(1.55rem, 3vw, 2.25rem);
}

h3 {
  font-size: clamp(1.3rem, 2.2vw, 1.7rem);
}

p,
.cnxml-para {
  width: min(100%, 78ch);
  max-width: 78ch;
  margin-block: 0.7rem;
  margin-inline: auto;
}

.module ul,
.module ol {
  width: min(100%, 78ch);
  margin-inline: auto;
}

.cnxml-list[data-number-style="lower-alpha"]:not(.source-circled):not(.source--circled) {
  list-style-type: lower-alpha;
}

.cnxml-list[data-bullet-style="open-circle"] {
  list-style-type: circle;
}

.cnxml-list[data-bullet-style="none"],
.cnxml-list.source-circled,
.cnxml-list.source--circled {
  list-style-type: none;
}

.source-underline {
  text-decoration: underline;
}

.module-nav {
  display: grid;
  grid-template-columns: auto minmax(9rem, 1fr) auto minmax(9rem, 1fr);
  gap: 0.75rem;
  align-items: center;
  margin-block: 0 2rem;
  padding-block: 0 1rem;
  border-bottom: 1px solid var(--line);
  font-size: 0.91rem;
}

.module-nav:last-child {
  margin-block: 2rem 0;
  padding-block: 1rem 0;
  border-top: 1px solid var(--line);
  border-bottom: 0;
}

.module-nav a[rel="next"] {
  text-align: right;
}

.module-position {
  color: var(--muted);
  white-space: nowrap;
}

.toc-list {
  margin: 0;
  padding-left: 1.6rem;
}

.toc-list .toc-list {
  margin-top: 0.45rem;
}

.toc-module,
.toc-chapter {
  margin-block: 0.42rem;
}

.toc-chapter {
  margin-top: 1.2rem;
}

.toc-chapter-title {
  display: inline-block;
  color: var(--accent-dark);
  font-size: 1.14rem;
  font-weight: 800;
}

.cnxml-section {
  margin-block: 1.6rem;
}

.cnxml-note,
.cnxml-example,
.cnxml-exercise,
.cnxml-definition,
.cnxml-glossary,
.module-abstract {
  margin-block: 1.35rem;
  padding: 1rem 1.15rem;
  border: 1px solid var(--line);
  border-left: 0.38rem solid var(--accent);
  border-radius: 0.5rem;
  background: var(--wash);
}

.cnxml-note {
  background: var(--note);
  border-left-color: #ca8a04;
}

.module-abstract {
  background: var(--accent-soft);
  border-left-color: var(--accent);
}

.module-abstract > h2 {
  margin-top: 0;
  font-size: 1.25rem;
}

.cnxml-example {
  background: var(--example);
  border-left-color: #15803d;
}

.cnxml-exercise {
  background: #f8fafc;
  border-left-color: #475569;
}

.cnxml-label {
  font-weight: 800;
}

.cnxml-equation {
  max-width: 100%;
  margin-block: 1rem;
  overflow-x: auto;
  text-align: center;
}

math {
  display: inline-block;
  max-width: 100%;
  overflow-x: auto;
  overflow-y: hidden;
  font-size: 1.04em;
  vertical-align: middle;
}

math[display="block"],
.cnxml-equation > math {
  display: block;
  margin-inline: auto;
}

.cnxml-media {
  display: inline-block;
  max-width: 100%;
  vertical-align: middle;
}

.cnxml-media img,
figure img {
  display: block;
  max-width: 100%;
  height: auto;
  margin-inline: auto;
}

figure {
  max-width: 100%;
  margin: 1.5rem auto;
  padding: 0.75rem;
  border: 1px solid var(--line);
  border-radius: 0.5rem;
  background: #ffffff;
}

figcaption,
.cnxml-caption {
  max-width: 76ch;
  margin: 0.65rem auto 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.table-scroll {
  max-width: 100%;
  margin-block: 1.25rem;
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 0.45rem;
}

table {
  width: max-content;
  min-width: 100%;
  border-collapse: collapse;
  background: #ffffff;
}

caption {
  padding: 0.8rem;
  color: var(--ink);
  font-weight: 700;
  text-align: left;
}

th,
td {
  min-width: 3rem;
  padding: 0.55rem 0.7rem;
  border: 1px solid var(--line);
  vertical-align: top;
}

th {
  background: var(--accent-soft);
}

details.cnxml-solution {
  margin-block: 0.9rem;
  border: 1px solid #c4b5fd;
  border-radius: 0.45rem;
  background: var(--solution);
}

details.cnxml-solution > summary {
  padding: 0.7rem 0.9rem;
  color: #4c1d95;
  font-weight: 800;
  cursor: pointer;
}

.solution-body {
  padding: 0 0.9rem 0.9rem;
}

.site-footer {
  width: min(100% - 2rem, 84rem);
  margin: 0 auto 2.5rem;
  color: var(--muted);
  font-size: 0.9rem;
}

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

.print-view {
  width: min(100% - 2rem, 84rem);
  margin-inline: auto;
  background: #ffffff;
}

.print-front,
.print-module {
  padding: 1.5rem;
}

.print-module {
  break-before: page;
}

@media (max-width: 52rem) {
  :root {
    font-size: 16px;
  }

  .page-shell {
    width: min(100% - 1rem, 84rem);
    margin-top: 0.5rem;
    padding: 1rem;
    border-radius: 0.45rem;
  }

  .edition-notice {
    width: min(100% - 1rem, 84rem);
    margin-top: 0.5rem;
  }

  .module-nav {
    grid-template-columns: 1fr;
  }

  .module-nav a[rel="next"],
  .module-position {
    text-align: left;
  }

  .nav-spacer {
    display: none;
  }

  th,
  td {
    padding: 0.42rem;
  }
}

@media print {
  @page {
    size: A4;
    margin: 18mm 16mm 20mm;
  }

  :root {
    color: #000000;
    font-size: 10.5pt;
    line-height: 1.42;
  }

  html,
  body,
  .print-view {
    width: auto;
    margin: 0;
    background: #ffffff;
  }

  a {
    color: inherit;
    text-decoration: none;
  }

  .site-header,
  .compact-header,
  .module-nav,
  .site-footer {
    display: none !important;
  }

  .page-shell,
  .print-front,
  .print-module {
    width: auto;
    margin: 0;
    padding: 0;
    border: 0;
    border-radius: 0;
    box-shadow: none;
  }

  .print-front {
    break-after: page;
  }

  .print-module {
    break-before: page;
  }

  h1,
  h2,
  h3,
  h4,
  figure,
  table,
  details,
  .cnxml-note,
  .cnxml-example,
  .cnxml-exercise {
    break-inside: avoid;
  }

  .table-scroll {
    overflow: visible;
    border: 0;
  }

  table {
    width: 100%;
    min-width: 0;
    font-size: 8.7pt;
  }

  details.cnxml-solution[open] > .solution-body {
    display: block !important;
  }
}