:root {
  color-scheme: dark;
  --ink: #f1ece2;
  --ink-soft: #c5bcb0;
  --paper: #12110f;
  --paper-raised: #191714;
  --paper-soft: #211e1a;
  --line: #3d3831;
  --accent: #d99068;
  --accent-light: #f2b18b;
  --button-ink: #19100b;
  --serif: Georgia, "Times New Roman", Times, serif;
  --sans: ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  --measure: 70rem;
  --text-measure: 43rem;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 6.5rem; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif);
  font-size: clamp(1.05rem, 0.99rem + 0.24vw, 1.18rem);
  line-height: 1.72;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}
img, svg { display: block; max-width: 100%; }
a { color: var(--accent-light); text-underline-offset: 0.2em; text-decoration-thickness: 0.08em; }
a:hover { color: var(--ink); }
a:focus-visible, button:focus-visible, summary:focus-visible {
  outline: 3px solid var(--accent-light);
  outline-offset: 4px;
  border-radius: 0.12rem;
}
::selection { background: var(--accent); color: var(--button-ink); }

.skip-link {
  position: fixed;
  z-index: 100;
  top: 0.75rem;
  left: 0.75rem;
  padding: 0.65rem 0.9rem;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--sans);
  font-weight: 700;
  transform: translateY(-180%);
}
.skip-link:focus { transform: translateY(0); }

.site-header {
  position: sticky;
  z-index: 20;
  top: 0;
  border-bottom: 1px solid color-mix(in srgb, var(--line), transparent 20%);
  background: color-mix(in srgb, var(--paper), transparent 4%);
  backdrop-filter: blur(12px);
}
.nav-shell {
  width: min(calc(100% - 2rem), var(--measure));
  min-height: 4.7rem;
  margin-inline: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.4rem;
}
.brand {
  color: var(--ink);
  font-family: var(--serif);
  font-size: 1.05rem;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.015em;
  text-decoration: none;
  white-space: nowrap;
}
.brand-mark { color: var(--accent); font-family: var(--mono); margin-right: 0.42rem; }
.nav-bar { display: contents; }
.nav-toggle { display: none; }
.nav-list {
  display: flex;
  align-items: center;
  gap: clamp(0.75rem, 2vw, 1.55rem);
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--sans);
  font-size: 0.78rem;
  font-weight: 650;
  letter-spacing: 0.025em;
}
.nav-list a { color: var(--ink-soft); text-decoration: none; }
.nav-list a:hover, .nav-list a[aria-current="page"] { color: var(--ink); }
.nav-list .buy-link {
  display: inline-flex;
  min-height: 2.55rem;
  align-items: center;
  padding: 0.45rem 0.85rem;
  border: 1px solid var(--accent);
  color: var(--ink);
}
.nav-list .buy-link:hover { background: var(--accent); color: var(--button-ink); }

.shell { width: min(calc(100% - 2rem), var(--measure)); margin-inline: auto; }
.narrow { width: min(calc(100% - 2rem), var(--text-measure)); margin-inline: auto; }
.section { padding-block: clamp(4.4rem, 9vw, 8rem); border-top: 1px solid var(--line); }
.section-soft { background: var(--paper-raised); }
.section-head { max-width: 48rem; margin-bottom: clamp(2.2rem, 5vw, 4rem); }
.eyebrow {
  margin: 0 0 1rem;
  color: var(--accent-light);
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 600;
  line-height: 1.4;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}
h1, h2, h3 {
  margin: 0;
  color: var(--ink);
  font-family: var(--serif);
  font-weight: 600;
  line-height: 1.08;
  letter-spacing: -0.035em;
  text-wrap: balance;
}
h1 { font-size: clamp(3.25rem, 8.5vw, 7.9rem); }
h2 { font-size: clamp(2.25rem, 5.4vw, 4.7rem); }
h3 { font-size: clamp(1.35rem, 2.6vw, 2rem); letter-spacing: -0.02em; }
p { margin-block: 0 1.2em; }
.lede {
  max-width: 41rem;
  color: var(--ink-soft);
  font-size: clamp(1.2rem, 1.03rem + 0.72vw, 1.65rem);
  line-height: 1.52;
}
.small-note { color: var(--ink-soft); font-family: var(--sans); font-size: 0.8rem; line-height: 1.55; }
.kicker-line { width: 3.5rem; height: 1px; margin: 1.2rem 0 1.5rem; border: 0; background: var(--accent); }

.hero {
  min-height: calc(100svh - 4.7rem);
  display: grid;
  align-items: center;
  overflow: hidden;
  padding-block: clamp(3.5rem, 7vw, 7rem);
  border-top: 0;
}
.hero-grid { display: grid; grid-template-columns: minmax(0, 1.4fr) minmax(17rem, 0.62fr); align-items: center; gap: clamp(3rem, 8vw, 8rem); }
.hero-copy { position: relative; z-index: 1; min-width: 0; }
.hero h1 {
  max-width: 100%;
  font-size: clamp(4.25rem, 7vw, 76pt);
  line-height: 0.98;
  letter-spacing: 0.018em;
}
.hero-subtitle {
  margin: 0.65rem 0 1.7rem;
  color: var(--ink);
  font-size: clamp(1.4rem, 2.6vw, 2.25rem);
  font-style: italic;
  line-height: 1.25;
}
.hero-description { max-width: 38rem; color: var(--ink-soft); font-size: clamp(1.12rem, 1.02rem + 0.45vw, 1.42rem); line-height: 1.55; }
.actions { display: flex; flex-wrap: wrap; gap: 0.8rem; margin-top: 2.1rem; }
.button {
  display: inline-flex;
  min-height: 3.25rem;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
  padding: 0.72rem 1.15rem;
  border: 1px solid var(--line);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 0.82rem;
  font-weight: 750;
  letter-spacing: 0.025em;
  text-decoration: none;
}
.button-primary { border-color: var(--accent); background: var(--accent); color: var(--button-ink); }
.button-primary:hover { background: var(--accent-light); color: var(--button-ink); }
.button-secondary:hover { border-color: var(--ink-soft); background: var(--paper-soft); color: var(--ink); }
.button-arrow { font-family: var(--mono); font-weight: 400; }

.book-figure { margin: 0; position: relative; }
.book-figure::before {
  content: "001101 / 21M / SHA-256";
  position: absolute;
  z-index: -1;
  right: -3rem;
  top: -2.1rem;
  color: #51493f;
  font-family: var(--mono);
  font-size: 0.65rem;
  letter-spacing: 0.1em;
  writing-mode: vertical-rl;
}
.book-cover { width: min(100%, 25rem); margin-inline: auto; box-shadow: 1.15rem 1.25rem 0 #090806, 0 2rem 5rem rgba(0,0,0,.42); }
.book-figure figcaption { max-width: 25rem; margin: 1.5rem auto 0; color: var(--ink-soft); font-family: var(--sans); font-size: 0.72rem; line-height: 1.5; }

.split { display: grid; grid-template-columns: minmax(0, .72fr) minmax(0, 1.28fr); gap: clamp(2.5rem, 8vw, 8rem); }
.prose { max-width: var(--text-measure); }
.prose > *:first-child { margin-top: 0; }
.prose h2 { margin: 2.2em 0 0.65em; font-size: clamp(2rem, 4.4vw, 3.5rem); }
.prose h3 { margin: 2.2em 0 0.65em; }
.prose ul, .prose ol { padding-left: 1.25em; }
.prose li { margin-block: 0.45em; }
.pull {
  margin: 2rem 0;
  padding: 0 0 0 1.4rem;
  border-left: 2px solid var(--accent);
  color: var(--ink);
  font-size: clamp(1.22rem, 1.06rem + .62vw, 1.6rem);
  font-style: italic;
  line-height: 1.5;
}

.fact-grid, .card-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1px; border: 1px solid var(--line); background: var(--line); }
.fact, .card { background: var(--paper); padding: clamp(1.4rem, 3vw, 2.4rem); }
.publisher-mark {
  width: min(16rem, 55%);
  min-height: 3rem;
  display: flex;
  align-items: center;
  margin-top: 1.5rem;
  padding: .45rem 0;
}
.publisher-mark img { width: 100%; height: auto; }
.publisher-mark-centered { margin: 0 auto 2rem; }
.hero-publisher-mark {
  position: absolute;
  z-index: 2;
  left: 50%;
  bottom: clamp(.75rem, 1.8vw, 1.5rem);
  width: min(14rem, 42vw);
  min-height: 2.75rem;
  margin: 0;
  padding: .35rem 0;
  transform: translateX(-50%);
}
.fact-label { display: block; margin-bottom: 0.5rem; color: var(--ink-soft); font-family: var(--mono); font-size: 0.68rem; letter-spacing: .1em; text-transform: uppercase; }
.fact-value { font-size: 1.2rem; line-height: 1.35; }
.card h3 { margin-bottom: 1rem; }
.card p:last-child { margin-bottom: 0; }
.card-number { display: block; margin-bottom: 2.8rem; color: var(--accent-light); font-family: var(--mono); font-size: 0.7rem; }

.name-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); margin: 0; padding: 0; border-top: 1px solid var(--line); list-style: none; }
.name-list li { padding: 1.3rem 0; border-bottom: 1px solid var(--line); }
.name-list li:nth-child(odd) { padding-right: 1.4rem; }
.name-list li:nth-child(even) { padding-left: 1.4rem; border-left: 1px solid var(--line); }
.name-list a { display: block; color: inherit; text-decoration: none; }
.name-list a:hover strong { color: var(--accent-light); }
.name-list a:hover span { color: var(--ink); }
.name-list a::after { content: "→"; float: right; margin-top: -2.35rem; color: var(--accent); font-family: var(--mono); font-size: .72rem; opacity: .72; }
.name-list strong { display: block; padding-right: 1.5rem; color: var(--ink); font-size: 1.1rem; font-weight: 600; }
.name-list span { display: block; padding-right: 1.5rem; color: var(--ink-soft); font-family: var(--sans); font-size: .76rem; line-height: 1.45; }

.external-panel { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(17rem, .85fr); gap: clamp(2rem, 7vw, 6rem); align-items: start; }
.resource-links { margin: 0; padding: 0; border-top: 1px solid var(--line); list-style: none; }
.resource-links li { border-bottom: 1px solid var(--line); }
.resource-links a { display: flex; justify-content: space-between; gap: 1rem; padding: 1.15rem 0; color: var(--ink); font-family: var(--sans); font-weight: 650; text-decoration: none; }
.resource-links a:hover { color: var(--accent-light); }
.external-mark { color: var(--accent); font-family: var(--mono); }

.page-hero { padding-block: clamp(5rem, 11vw, 9rem); }
.page-hero h1 { max-width: 12ch; font-size: clamp(3.15rem, 8vw, 6.8rem); }
.page-hero .lede { margin-top: 1.5rem; }
.breadcrumb { margin: 0 0 2.5rem; color: var(--ink-soft); font-family: var(--sans); font-size: 0.76rem; }
.breadcrumb a { color: inherit; }

.toc { position: sticky; top: 6.5rem; align-self: start; }
.toc ol { margin: 0; padding: 0; border-top: 1px solid var(--line); list-style: none; counter-reset: toc; }
.toc li { counter-increment: toc; border-bottom: 1px solid var(--line); }
.toc a { display: grid; grid-template-columns: 2.4rem 1fr; padding: .9rem 0; color: var(--ink-soft); font-family: var(--sans); font-size: .78rem; line-height: 1.4; text-decoration: none; }
.toc a::before { content: "0" counter(toc); color: var(--accent); font-family: var(--mono); }
.toc a:hover { color: var(--ink); }

.reading-section { padding-top: 1rem; margin-bottom: 5rem; scroll-margin-top: 6.5rem; }
.reading-section h2 { margin-bottom: 1.7rem; font-size: clamp(2rem, 4vw, 3.2rem); }
.reading-list { margin: 0; padding: 0; border-top: 1px solid var(--line); list-style: none; }
.reading-item { padding: 1.45rem 0 1.55rem; border-bottom: 1px solid var(--line); }
.reading-item-head { display: flex; align-items: baseline; justify-content: space-between; gap: 1rem; margin-bottom: 0.45rem; }
.reading-item h3 { font-size: clamp(1.16rem, 2vw, 1.42rem); line-height: 1.3; letter-spacing: -.015em; }
.reading-item h3 cite { font-style: italic; }
.year { flex: none; color: var(--accent-light); font-family: var(--mono); font-size: .72rem; }
.reading-item p { margin: 0; color: var(--ink-soft); font-size: .98rem; line-height: 1.6; }
.source-link { display: inline-block; margin-top: .55rem; font-family: var(--sans); font-size: .74rem; font-weight: 650; }

.notice { margin: 2rem 0; padding: 1.25rem 1.4rem; border: 1px solid var(--line); background: var(--paper-raised); color: var(--ink-soft); font-family: var(--sans); font-size: .84rem; line-height: 1.6; }
.notice strong { color: var(--ink); }
.resource-stack { display: grid; gap: 1px; margin-top: 2rem; border: 1px solid var(--line); background: var(--line); }
.resource-card { display: grid; grid-template-columns: minmax(10rem, .75fr) minmax(0, 1.25fr); gap: 2rem; padding: clamp(1.5rem, 4vw, 2.5rem); background: var(--paper); }
.resource-card h2 { font-size: clamp(1.5rem, 3vw, 2.25rem); }
.resource-card p { color: var(--ink-soft); }

.cta-band { padding-block: clamp(4rem, 8vw, 7rem); border-top: 1px solid var(--line); text-align: center; }
.cta-band h2 { max-width: 13ch; margin-inline: auto; }
.cta-band p { max-width: 38rem; margin: 1.2rem auto 0; color: var(--ink-soft); }
.cta-band .actions { justify-content: center; }

.site-footer { border-top: 1px solid var(--line); padding-block: 2.7rem; }
.footer-grid { display: grid; grid-template-columns: 1fr auto; gap: 2rem; align-items: end; }
.footer-title { margin: 0; font-size: 1.25rem; font-weight: 600; }
.footer-note { margin: .35rem 0 0; color: var(--ink-soft); font-family: var(--sans); font-size: .72rem; }
.footer-links { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 1rem 1.4rem; margin: 0; padding: 0; list-style: none; font-family: var(--sans); font-size: .75rem; }
.footer-links a { color: var(--ink-soft); }

.error-page { min-height: calc(100svh - 4.7rem); display: grid; place-items: center; padding-block: 5rem; text-align: center; }
.error-code { margin: 0; color: var(--accent); font-family: var(--mono); font-size: .8rem; letter-spacing: .14em; }
.error-page h1 { margin: .7rem 0 1.2rem; font-size: clamp(4rem, 15vw, 9rem); }
.error-page p { max-width: 35rem; color: var(--ink-soft); }

@media (max-width: 860px) {
  .nav-shell { align-items: flex-start; flex-direction: column; padding-block: 1rem; gap: .9rem; }
  .hero { min-height: auto; }
  .hero-grid, .split, .external-panel { grid-template-columns: 1fr; }
  .hero-copy { order: 1; }
  .book-figure { order: 2; width: min(78vw, 22rem); margin-inline: auto; }
  .toc { position: static; }
  .fact-grid, .card-grid { grid-template-columns: 1fr; }
}

@media (max-width: 600px) {
  html { scroll-padding-top: 8rem; }
  body { font-size: 1.05rem; }
  .shell, .narrow, .nav-shell { width: min(calc(100% - 1.4rem), var(--measure)); }
  .section { padding-block: 4rem; }
  .hero { padding-top: 3.3rem; }
  .hero h1 { font-size: clamp(3rem, 15vw, 4.6rem); hyphens: auto; }
  .actions { flex-direction: column; }
  .button { width: 100%; }
  .name-list { grid-template-columns: 1fr; }
  .name-list li:nth-child(odd), .name-list li:nth-child(even) { padding-inline: 0; border-left: 0; }
  .resource-card { grid-template-columns: 1fr; gap: .75rem; }
  .reading-item-head { align-items: flex-start; flex-direction: column; gap: .35rem; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-links { justify-content: flex-start; }
}

@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
@media print {
  :root { color-scheme: light; --ink: #111; --ink-soft: #333; --paper: #fff; --paper-raised: #fff; --paper-soft: #f5f5f5; --line: #bbb; --accent: #6b2f16; --accent-light: #6b2f16; }
  .site-header, .site-footer, .actions, .toc { display: none; }
  .section { padding-block: 2rem; }
  a { color: inherit; }
}
/* Leviathan-derived atmosphere and book-structure components */
.hero-leviathan {
  position: relative;
  isolation: isolate;
  background:
    linear-gradient(90deg, var(--paper) 0%, rgba(18,17,15,.96) 42%, rgba(18,17,15,.77) 100%),
    url('/assets/images/leviathan-bg.webp') right center / min(61rem, 78vw) auto no-repeat;
}
.hero-leviathan::before {
  content: "";
  position: absolute;
  z-index: -1;
  inset: 0;
  background:
    linear-gradient(180deg, var(--paper) 0, transparent 18%, transparent 76%, var(--paper) 100%),
    repeating-linear-gradient(0deg, transparent 0 5px, rgba(241,236,226,.016) 5px 6px);
  pointer-events: none;
}
.hero-leviathan::after {
  content: "LEVIATHAN / KODE / SUVERÆNITET";
  position: absolute;
  z-index: -1;
  right: max(1rem, calc((100vw - var(--measure)) / 2));
  bottom: 1rem;
  color: rgba(241,236,226,.28);
  font-family: var(--mono);
  font-size: .58rem;
  letter-spacing: .14em;
}
.hero-leviathan .book-cover {
  border: 1px solid rgba(241,236,226,.2);
  box-shadow: 1.15rem 1.25rem 0 rgba(9,8,6,.86), 0 2rem 5rem rgba(0,0,0,.58);
}
.book-map { position: relative; overflow: hidden; }
.book-map::after {
  content: "κρυπτός";
  position: absolute;
  z-index: -1;
  right: -0.08em;
  top: -.2em;
  color: rgba(241,236,226,.025);
  font-size: clamp(9rem, 27vw, 27rem);
  line-height: 1;
}
.part-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border: 1px solid var(--line);
  background: var(--line);
  gap: 1px;
}
.part-card {
  min-height: 20rem;
  display: flex;
  flex-direction: column;
  padding: clamp(1.6rem, 4vw, 3rem);
  background: color-mix(in srgb, var(--paper), transparent 2%);
}
.part-card h3 { max-width: 13ch; margin-bottom: 1.2rem; }
.part-card p { margin: auto 0 0; color: var(--ink-soft); }
.part-index {
  display: block;
  margin-bottom: clamp(2.5rem, 6vw, 5rem);
  color: var(--accent-light);
  font-family: var(--mono);
  font-size: .7rem;
  letter-spacing: .08em;
  text-transform: uppercase;
}
.editorial-note {
  max-width: 58rem;
  margin: 2rem 0 0;
  padding-left: 1.2rem;
  border-left: 2px solid var(--accent);
  color: var(--ink-soft);
  font-family: var(--sans);
  font-size: .82rem;
  line-height: 1.65;
}
.editorial-note strong { color: var(--ink); }
.concept-list { margin: 0; }
.concept-list > div {
  display: grid;
  grid-template-columns: minmax(9rem, .62fr) minmax(0, 1.38fr);
  gap: clamp(1rem, 4vw, 3rem);
  padding: 1.35rem 0;
  border-top: 1px solid var(--line);
}
.concept-list > div:last-child { border-bottom: 1px solid var(--line); }
.concept-list dt { color: var(--ink); font-size: 1.12rem; font-weight: 600; }
.concept-list dd { margin: 0; color: var(--ink-soft); font-size: .98rem; line-height: 1.62; }
.author-section {
  background:
    linear-gradient(90deg, var(--paper) 0%, rgba(18,17,15,.94) 100%),
    url('/assets/images/leviathan-bg.webp') right center / 58rem auto no-repeat;
}
@media (max-width: 860px) {
  .hero-leviathan {
    background:
      linear-gradient(180deg, rgba(18,17,15,.97) 0%, rgba(18,17,15,.91) 48%, rgba(18,17,15,.73) 100%),
      url('/assets/images/leviathan-bg.webp') center bottom / auto 65% no-repeat;
  }
  .part-grid { grid-template-columns: 1fr; }
  .part-card { min-height: 16rem; }
  .part-index { margin-bottom: 2.5rem; }
}
@media (max-width: 600px) {
  .hero-leviathan::after { display: none; }
  .concept-list > div { grid-template-columns: 1fr; gap: .45rem; }
}
@media print {
  .hero-leviathan, .author-section { background: none; }
}

/* User-supplied full-page background and mobile-first refinements */
body {
  background-color: var(--paper);
  background-image:
    linear-gradient(rgba(18,17,15,.965), rgba(18,17,15,.985)),
    url('/assets/images/background.webp');
  background-position: center top;
  background-size: min(100rem, 125vw) auto;
  background-repeat: repeat-y;
  background-attachment: scroll;
}
.section, .cta-band, .site-footer { background-color: rgba(18,17,15,.93); }
.section-soft { background-color: rgba(25,23,20,.95); }
.hero-leviathan {
  background:
    linear-gradient(90deg, rgba(18,17,15,.99) 0%, rgba(18,17,15,.95) 43%, rgba(18,17,15,.66) 100%),
    url('/assets/images/background.webp') right 31% center / min(66rem, 76vw) auto no-repeat;
}
.hero-leviathan::before {
  background:
    linear-gradient(180deg, var(--paper) 0, transparent 18%, transparent 76%, var(--paper) 100%),
    repeating-linear-gradient(0deg, transparent 0 5px, rgba(241,236,226,.014) 5px 6px);
}
.author-section {
  background:
    linear-gradient(90deg, rgba(18,17,15,.99) 0%, rgba(18,17,15,.93) 58%, rgba(18,17,15,.84) 100%),
    url('/assets/images/background.webp') right 16% center / 52rem auto no-repeat;
}
.book-figure picture { display: block; }
.book-cover { height: auto; }

@media (max-width: 860px) {
  .site-header { position: relative; backdrop-filter: none; }
  .nav-shell { width: 100%; padding: 0; gap: 0; }
  .nav-bar {
    width: 100%;
    min-height: 4.35rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: .65rem 1rem;
  }
  .brand { min-width: 0; margin: 0; overflow: hidden; text-overflow: ellipsis; }
  .nav-toggle {
    min-width: 4.75rem;
    min-height: 2.85rem;
    display: inline-flex;
    flex: none;
    align-items: center;
    justify-content: center;
    gap: .55rem;
    padding: .55rem .7rem;
    border: 1px solid var(--line);
    background: var(--paper-raised);
    color: var(--ink);
    font: 700 .72rem/1 var(--sans);
    letter-spacing: .06em;
    text-transform: uppercase;
    cursor: pointer;
  }
  .nav-toggle-icon { width: 1rem; display: grid; gap: .28rem; }
  .nav-toggle-icon span { width: 100%; height: 1px; display: block; background: currentColor; transition: transform .16s ease; }
  .nav-toggle[aria-expanded="true"] .nav-toggle-icon span:first-child { transform: translateY(.145rem) rotate(45deg); }
  .nav-toggle[aria-expanded="true"] .nav-toggle-icon span:last-child { transform: translateY(-.145rem) rotate(-45deg); }
  .nav-list {
    width: 100%;
    display: grid;
    grid-template-columns: 1fr;
    gap: 0;
    overflow: visible;
    padding: 0 1rem .8rem;
    border-top: 1px solid var(--line);
  }
  .js .nav-list { display: none; }
  .js .nav-list.is-open { display: grid; }
  .nav-list li { width: 100%; border-bottom: 1px solid var(--line); }
  .nav-list a, .nav-list .buy-link {
    width: 100%;
    min-height: 3.15rem;
    display: flex;
    align-items: center;
    padding: .65rem .2rem;
    border: 0;
    white-space: normal;
  }
  .nav-list .buy-link { color: var(--accent-light); }
  .nav-list .buy-link::after { content: "↗"; margin-left: auto; font-family: var(--mono); }
  .hero-leviathan {
    background:
      linear-gradient(180deg, rgba(18,17,15,.985) 0%, rgba(18,17,15,.94) 48%, rgba(18,17,15,.75) 100%),
      url('/assets/images/background-mobile.webp') center bottom / 100% auto no-repeat;
  }
  .hero-grid { gap: 3.4rem; }
  .book-figure { width: min(72vw, 20rem); }
  .hero-publisher-mark { position: static; justify-self: center; margin: 1.25rem auto 0; transform: none; }
  .book-figure::before { right: -1.25rem; }
}

@media (max-width: 600px) {
  html { scroll-padding-top: 1rem; }
  body {
    font-size: 1rem;
    line-height: 1.68;
    background-image:
      linear-gradient(rgba(18,17,15,.975), rgba(18,17,15,.99)),
      url('/assets/images/background-mobile.webp');
    background-size: 100% auto;
  }
  .shell, .narrow { width: min(calc(100% - 2rem), var(--measure)); }
  .nav-shell { width: 100%; }
  .brand { font-size: 1rem; }
  .nav-list { font-size: .75rem; }
  .hero { padding-block: 2.7rem 4.3rem; }
  .hero h1 {
    max-width: 100%;
    font-size: clamp(2.55rem, 11.7vw, 3.55rem);
    line-height: 1;
    letter-spacing: 0.012em;
    overflow-wrap: anywhere;
  }
  .hero-subtitle { margin-top: .85rem; font-size: clamp(1.28rem, 6vw, 1.65rem); }
  .hero-description { font-size: 1.08rem; line-height: 1.5; }
  .actions { margin-top: 1.6rem; gap: .65rem; }
  .button { min-height: 3.35rem; padding: .8rem 1rem; }
  .book-figure { width: min(78vw, 18rem); }
  .book-cover { box-shadow: .7rem .8rem 0 rgba(9,8,6,.86), 0 1.4rem 3rem rgba(0,0,0,.52); }
  .book-figure figcaption { margin-top: 1.15rem; font-size: .7rem; }
  .section { padding-block: 3.6rem; }
  .section-head { margin-bottom: 2.25rem; }
  h2 { font-size: clamp(2.05rem, 10.5vw, 3.2rem); }
  h3 { line-height: 1.16; }
  .lede { font-size: 1.17rem; line-height: 1.48; }
  .split { gap: 2rem; }
  .fact, .card, .part-card, .resource-card { padding: 1.4rem; }
  .publisher-mark { width: min(14rem, 70%); min-height: 3.25rem; margin-top: 1.25rem; }
  .publisher-mark-centered { margin: 0 auto 1.7rem; }
  .hero-publisher-mark { bottom: .6rem; width: min(12rem, 52vw); min-height: 2.75rem; margin: 1.25rem auto -2.4rem; }
  .part-card { min-height: 0; }
  .part-index { margin-bottom: 2rem; }
  .part-card p { margin-top: 2rem; }
  .concept-list > div { padding: 1.15rem 0; }
  .concept-list dd, .reading-item p { font-size: .96rem; }
  .name-list strong { font-size: 1.05rem; }
  .reading-section { margin-bottom: 3.6rem; }
  .reading-item { padding-block: 1.25rem; }
  .source-link { display: inline-flex; min-height: 2.75rem; align-items: center; margin-top: .35rem; }
  .resource-links a { min-height: 3.35rem; align-items: center; }
  .notice, .editorial-note { font-size: .8rem; }
  .page-hero { padding-block: 3.75rem; }
  .page-hero h1 { font-size: clamp(2.75rem, 13vw, 4.2rem); overflow-wrap: anywhere; }
  .toc a { min-height: 3rem; align-items: center; }
  .footer-links { row-gap: .3rem; }
  .footer-links a { display: inline-flex; min-height: 2.75rem; align-items: center; }
}

@media (max-width: 370px) {
  .shell, .narrow { width: min(calc(100% - 1.5rem), var(--measure)); }
  .hero h1 { font-size: 2.55rem; }
  .book-figure { width: min(82vw, 17rem); }
  .fact-grid, .card-grid, .part-grid, .resource-stack { margin-inline: 0; }
}

@media print {
  body, .section, .section-soft, .cta-band, .site-footer { background: #fff; }
}