:root {
  --color-paper: #f6f2e9;
  --color-paper-deep: #eee8dc;
  --color-surface: #fbf9f4;
  --color-ink: #202624;
  --color-muted: #5e6661;
  --color-navy: #18364a;
  --color-forest: #2f5448;
  --color-bronze: #9a7447;
  --color-gold-soft: #c7ad7b;
  --color-border: #d8d0c1;
  --color-focus: #b66b28;
  --font-display: Georgia, "Times New Roman", Times, serif;
  --font-body: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --space-1: 0.375rem;
  --space-2: 0.75rem;
  --space-3: 1rem;
  --space-4: 1.5rem;
  --space-5: 2rem;
  --space-6: 3rem;
  --space-7: 4.5rem;
  --space-8: 6.5rem;
  --content-wide: 76rem;
  --content-reading: 46rem;
  --radius: 0.35rem;
  --transition: 180ms ease;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  overflow-x: hidden;
  background: var(--color-paper);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.7;
  text-rendering: optimizeLegibility;
}

img,
svg {
  display: block;
  max-width: 100%;
}

a {
  color: var(--color-navy);
  text-decoration-color: color-mix(in srgb, var(--color-bronze) 75%, transparent);
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.22em;
}

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

:focus-visible {
  outline: 3px solid var(--color-focus);
  outline-offset: 4px;
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: var(--space-3);
  left: var(--space-3);
  padding: var(--space-2) var(--space-3);
  transform: translateY(-180%);
  background: var(--color-ink);
  color: #fff;
}

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

.site-header {
  position: relative;
  z-index: 20;
  border-bottom: 1px solid var(--color-border);
  background: color-mix(in srgb, var(--color-paper) 94%, transparent);
}

.nav-shell {
  display: flex;
  width: min(calc(100% - 2rem), var(--content-wide));
  min-height: 5.25rem;
  margin-inline: auto;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.brand {
  display: inline-flex;
  flex: 0 0 auto;
  align-items: center;
  gap: 0.75rem;
  color: var(--color-ink);
  font-family: var(--font-display);
  font-size: 1.12rem;
  font-weight: 700;
  line-height: 1.1;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  width: 2.1rem;
  height: 2.1rem;
  border: 1px solid var(--color-bronze);
  place-items: center;
  color: var(--color-navy);
  font-family: var(--font-body);
  font-size: 0.66rem;
  font-weight: 750;
  letter-spacing: 0.08em;
}

.primary-nav {
  display: flex;
  align-items: center;
}

.nav-list {
  display: flex;
  margin: 0;
  padding: 0;
  align-items: center;
  gap: clamp(0.9rem, 1.6vw, 1.65rem);
  list-style: none;
}

.nav-list a {
  position: relative;
  display: block;
  padding-block: 1.8rem;
  color: var(--color-muted);
  font-size: 0.78rem;
  font-weight: 650;
  letter-spacing: 0.025em;
  line-height: 1.2;
  text-decoration: none;
  white-space: nowrap;
}

.nav-list a::after {
  position: absolute;
  right: 0;
  bottom: 1.2rem;
  left: 0;
  height: 1px;
  transform: scaleX(0);
  transform-origin: left;
  background: var(--color-bronze);
  content: "";
  transition: transform var(--transition);
}

.nav-list a:hover,
.nav-list a[aria-current="page"] {
  color: var(--color-ink);
}

.nav-list a:hover::after,
.nav-list a[aria-current="page"]::after {
  transform: scaleX(1);
}

.menu-toggle {
  display: none;
  padding: 0.65rem;
  border: 1px solid var(--color-border);
  background: transparent;
  color: var(--color-ink);
  cursor: pointer;
}

.menu-toggle-lines,
.menu-toggle-lines::before,
.menu-toggle-lines::after {
  display: block;
  width: 1.35rem;
  height: 1px;
  background: currentColor;
  content: "";
  transition: transform var(--transition), opacity var(--transition);
}

.menu-toggle-lines {
  position: relative;
}

.menu-toggle-lines::before {
  position: absolute;
  top: -0.4rem;
}

.menu-toggle-lines::after {
  position: absolute;
  top: 0.4rem;
}

.menu-toggle[aria-expanded="true"] .menu-toggle-lines {
  background: transparent;
}

.menu-toggle[aria-expanded="true"] .menu-toggle-lines::before {
  transform: translateY(0.4rem) rotate(45deg);
}

.menu-toggle[aria-expanded="true"] .menu-toggle-lines::after {
  transform: translateY(-0.4rem) rotate(-45deg);
}

main {
  min-height: 60vh;
}

.wide-shell,
.reading-shell {
  width: min(calc(100% - 2rem), var(--content-wide));
  margin-inline: auto;
}

.reading-shell {
  max-width: var(--content-reading);
}

.hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  border-bottom: 1px solid var(--color-border);
}

.hero::after {
  position: absolute;
  z-index: -1;
  right: -6rem;
  bottom: -7rem;
  width: min(48vw, 39rem);
  height: min(38vw, 31rem);
  border: 1px solid color-mix(in srgb, var(--color-bronze) 25%, transparent);
  border-radius: 50% 50% 0 0;
  content: "";
}

.hero-grid {
  display: grid;
  min-height: 38rem;
  padding-block: clamp(4.5rem, 9vw, 8.5rem);
  align-items: center;
  grid-template-columns: minmax(0, 1.25fr) minmax(14rem, 0.75fr);
  gap: clamp(3rem, 8vw, 8rem);
}

.hero-copy {
  max-width: 51rem;
}

.eyebrow {
  margin: 0 0 var(--space-3);
  color: var(--color-forest);
  font-size: 0.73rem;
  font-weight: 750;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  color: var(--color-ink);
  font-family: var(--font-display);
  font-weight: 500;
  line-height: 1.08;
  text-wrap: balance;
}

h1 {
  max-width: 13ch;
  margin: 0;
  font-size: clamp(3rem, 7.5vw, 6.75rem);
  letter-spacing: -0.045em;
}

.article-hero h1 {
  max-width: 16ch;
  font-size: clamp(3rem, 6.5vw, 5.75rem);
}

h2 {
  margin: 0 0 var(--space-4);
  font-size: clamp(2rem, 4vw, 3.55rem);
  letter-spacing: -0.025em;
}

h3 {
  margin: 0 0 var(--space-3);
  font-size: clamp(1.45rem, 2.5vw, 2rem);
}

.hero-subtitle {
  max-width: 43rem;
  margin: var(--space-4) 0 0;
  color: var(--color-navy);
  font-family: var(--font-display);
  font-size: clamp(1.35rem, 2.4vw, 2rem);
  line-height: 1.35;
}

.hero-intro {
  max-width: 43rem;
  margin: var(--space-5) 0 0;
  color: var(--color-muted);
  font-size: clamp(1.03rem, 1.5vw, 1.2rem);
}

.text-link {
  display: inline-flex;
  margin-top: var(--space-5);
  align-items: center;
  gap: 0.65rem;
  font-size: 0.8rem;
  font-weight: 750;
  letter-spacing: 0.08em;
  text-decoration: none;
  text-transform: uppercase;
}

.text-link::after {
  content: "→";
  transition: transform var(--transition);
}

.text-link:hover::after {
  transform: translateX(0.25rem);
}

.ascent-motif {
  display: flex;
  min-height: 18rem;
  align-items: flex-end;
  justify-content: center;
  gap: clamp(0.35rem, 1.4vw, 0.85rem);
}

.ascent-motif span {
  width: clamp(1.8rem, 4vw, 3.8rem);
  border-top: 2px solid var(--color-bronze);
  background: linear-gradient(to bottom, rgba(154, 116, 71, 0.09), rgba(154, 116, 71, 0));
}

.ascent-motif span:nth-child(1) { height: 18%; }
.ascent-motif span:nth-child(2) { height: 32%; }
.ascent-motif span:nth-child(3) { height: 47%; }
.ascent-motif span:nth-child(4) { height: 63%; }
.ascent-motif span:nth-child(5) { height: 79%; }
.ascent-motif span:nth-child(6) { height: 96%; }

.section {
  padding-block: clamp(4.5rem, 9vw, 8rem);
}

.section + .section {
  border-top: 1px solid var(--color-border);
}

.section-tinted {
  background: var(--color-paper-deep);
}

.section-dark {
  background: var(--color-navy);
  color: #f4f0e7;
}

.section-dark h2,
.section-dark h3,
.section-dark a {
  color: #fff;
}

.section-dark p {
  color: #d9dedc;
}

.section-heading {
  display: grid;
  margin-bottom: clamp(2.5rem, 6vw, 5rem);
  grid-template-columns: minmax(0, 0.7fr) minmax(16rem, 1.3fr);
  gap: clamp(2rem, 7vw, 7rem);
}

.section-heading h2 {
  max-width: 14ch;
}

.section-heading p {
  max-width: 42rem;
  margin: 0;
  color: var(--color-muted);
  font-size: 1.08rem;
}

.topic-grid {
  display: grid;
  border-top: 1px solid var(--color-border);
  border-left: 1px solid var(--color-border);
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.topic-card {
  position: relative;
  min-height: 25rem;
  padding: clamp(2rem, 5vw, 4rem);
  border-right: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  background: color-mix(in srgb, var(--color-surface) 82%, transparent);
}

.topic-number {
  display: block;
  margin-bottom: clamp(4rem, 8vw, 7rem);
  color: var(--color-bronze);
  font-family: var(--font-display);
  font-size: 0.9rem;
}

.topic-card h3 {
  max-width: 15ch;
}

.topic-card p {
  max-width: 35rem;
  color: var(--color-muted);
}

.connection-list {
  margin: 0;
  padding: 0;
  border-top: 1px solid color-mix(in srgb, #fff 25%, transparent);
  list-style: none;
}

.connection-list li {
  display: grid;
  padding-block: var(--space-4);
  border-bottom: 1px solid color-mix(in srgb, #fff 25%, transparent);
  grid-template-columns: minmax(10rem, 0.55fr) 1fr;
  gap: var(--space-5);
}

.connection-list strong {
  color: #fff;
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 500;
}

.connection-list span {
  color: #d9dedc;
}

.prose {
  font-size: 1.05rem;
}

.prose > * {
  max-width: var(--content-reading);
  margin-inline: auto;
}

.prose section {
  padding-block: clamp(3.5rem, 7vw, 6rem);
}

.prose section + section {
  border-top: 1px solid var(--color-border);
}

.prose h2 {
  max-width: 17ch;
  margin-right: auto;
  margin-left: auto;
  font-size: clamp(2rem, 4vw, 3.2rem);
}

.prose p {
  margin-top: 0;
  margin-bottom: 1.25rem;
}

.prose ul {
  padding-left: 1.2rem;
}

.prose li + li {
  margin-top: 0.45rem;
}

.prose .lead {
  color: var(--color-navy);
  font-family: var(--font-display);
  font-size: clamp(1.25rem, 2.2vw, 1.7rem);
  line-height: 1.5;
}

.prose .observations {
  display: grid;
  max-width: var(--content-wide);
  margin-top: var(--space-5);
  padding: 0;
  border-top: 1px solid var(--color-border);
  border-left: 1px solid var(--color-border);
  grid-template-columns: repeat(2, minmax(0, 1fr));
  list-style: none;
}

.observations li {
  margin: 0;
  padding: var(--space-4);
  border-right: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  color: var(--color-navy);
  font-family: var(--font-display);
  font-size: 1.2rem;
}

.formula {
  max-width: 60rem;
  margin-block: var(--space-6);
  padding: clamp(2rem, 6vw, 4rem);
  border-block: 1px solid var(--color-bronze);
  color: var(--color-navy);
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 4vw, 3rem);
  line-height: 1.35;
  text-align: center;
}

.formula small {
  display: block;
  margin-top: var(--space-3);
  color: var(--color-muted);
  font-family: var(--font-body);
  font-size: 0.78rem;
  font-weight: 650;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.pull-quote {
  margin-block: var(--space-6);
  padding: var(--space-5) 0 var(--space-5) var(--space-5);
  border-left: 2px solid var(--color-bronze);
  color: var(--color-navy);
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 3.5vw, 2.75rem);
  line-height: 1.3;
}

.next-topic {
  padding-block: clamp(4rem, 8vw, 7rem);
  border-top: 1px solid var(--color-border);
  background: var(--color-paper-deep);
}

.next-topic-grid {
  display: grid;
  align-items: end;
  grid-template-columns: 1fr auto;
  gap: var(--space-5);
}

.next-topic h2 {
  margin-bottom: var(--space-3);
}

.next-topic p {
  max-width: 42rem;
  margin: 0;
  color: var(--color-muted);
}

.next-link {
  display: inline-flex;
  padding-bottom: 0.3rem;
  border-bottom: 1px solid var(--color-bronze);
  align-items: center;
  gap: var(--space-3);
  font-family: var(--font-display);
  font-size: 1.3rem;
  text-decoration: none;
  white-space: nowrap;
}

.related-links {
  display: flex;
  margin-top: var(--space-6);
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-border);
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2) var(--space-4);
  color: var(--color-muted);
  font-size: 0.83rem;
}

.related-links strong {
  color: var(--color-ink);
  font-size: 0.72rem;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.book-list {
  border-top: 1px solid var(--color-border);
}

.book-entry {
  display: grid;
  padding-block: clamp(2rem, 4vw, 3.5rem);
  border-bottom: 1px solid var(--color-border);
  grid-template-columns: minmax(12rem, 0.7fr) minmax(16rem, 1.3fr);
  gap: clamp(2rem, 8vw, 8rem);
}

.book-entry h2 {
  margin: 0;
  font-size: clamp(1.65rem, 3vw, 2.5rem);
}

.book-entry p {
  max-width: 42rem;
  margin-top: 0;
}

.book-label {
  display: block;
  margin-bottom: var(--space-2);
  color: var(--color-bronze);
  font-size: 0.7rem;
  font-weight: 750;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.site-footer {
  padding-block: var(--space-7) var(--space-5);
  background: #17211f;
  color: #cbd0cd;
}

.footer-grid {
  display: grid;
  grid-template-columns: minmax(14rem, 1fr) minmax(20rem, 1.4fr);
  gap: clamp(3rem, 9vw, 9rem);
}

.footer-title {
  margin: 0 0 var(--space-2);
  color: #fff;
  font-family: var(--font-display);
  font-size: 1.7rem;
}

.footer-tagline {
  max-width: 25rem;
  margin: 0;
}

.footer-nav {
  display: grid;
  margin: 0;
  padding: 0;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-2) var(--space-5);
  list-style: none;
}

.footer-nav a {
  color: #e3e6e4;
  font-size: 0.88rem;
}

.footer-meta {
  margin-top: var(--space-6);
  padding-top: var(--space-4);
  border-top: 1px solid #394440;
  color: #aeb6b2;
  font-size: 0.78rem;
}

.footer-meta p {
  margin: 0.45rem 0 0;
}

@media (max-width: 70rem) {
  .menu-toggle {
    display: block;
  }

  .primary-nav {
    position: absolute;
    top: 100%;
    right: 0;
    left: 0;
    display: none;
    padding: 0 1rem 1rem;
    border-bottom: 1px solid var(--color-border);
    background: var(--color-paper);
  }

  .primary-nav[data-open="true"] {
    display: block;
  }

  .nav-list {
    display: block;
    width: min(100%, var(--content-wide));
    margin-inline: auto;
    border-top: 1px solid var(--color-border);
  }

  .nav-list li {
    border-bottom: 1px solid var(--color-border);
  }

  .nav-list a {
    padding: 0.9rem 0;
    font-size: 0.86rem;
  }

  .nav-list a::after {
    display: none;
  }
}

@media (max-width: 48rem) {
  :root {
    --space-7: 3.5rem;
    --space-8: 4.5rem;
  }

  .brand {
    font-size: 1rem;
  }

  .hero-grid {
    min-height: auto;
    grid-template-columns: 1fr;
    gap: var(--space-5);
  }

  .ascent-motif {
    min-height: 9rem;
    justify-content: flex-start;
  }

  .ascent-motif span {
    width: clamp(1.7rem, 9vw, 3rem);
  }

  .section-heading,
  .next-topic-grid,
  .book-entry,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .topic-grid {
    grid-template-columns: 1fr;
  }

  .topic-card {
    min-height: auto;
  }

  .topic-number {
    margin-bottom: var(--space-6);
  }

  .connection-list li {
    grid-template-columns: 1fr;
    gap: var(--space-1);
  }

  .prose .observations {
    grid-template-columns: 1fr;
  }

  .next-link {
    white-space: normal;
  }
}

@media (max-width: 30rem) {
  .nav-shell,
  .wide-shell,
  .reading-shell {
    width: min(calc(100% - 1.25rem), var(--content-wide));
  }

  h1 {
    font-size: clamp(2.65rem, 15vw, 4rem);
  }

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

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}