:root {
  --parchment: #f3f5f7;
  --parchment-mid: #e7ecef;
  --parchment-dark: #d5dde3;
  --ink: #121723;
  --ink-mid: #334154;
  --ink-light: #607086;
  --rule: #bdc9d4;
  --accent: #167a72;
  --accent-2: #2b6df6;
  --glow: rgba(43, 109, 246, 0.14);
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
  scrollbar-gutter: stable;
  -ms-overflow-style: none;
  scrollbar-width: none;
}

html::-webkit-scrollbar {
  width: 0;
  height: 0;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 12% 14%, rgba(22, 122, 114, 0.16), transparent 34%),
    radial-gradient(circle at 88% 8%, rgba(43, 109, 246, 0.15), transparent 30%),
    linear-gradient(180deg, #f9fbfc 0%, var(--parchment) 52%, #eef2f5 100%);
  font-family: "EB Garamond", Georgia, serif;
  line-height: 1.78;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

main {
  flex: 1 0 auto;
}

.container {
  width: min(1080px, calc(100% - 2rem));
  margin: 0 auto;
}

.site-nav {
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(12px);
  background: color-mix(in srgb, #f7fafc 82%, transparent);
  border-bottom: 1px solid color-mix(in srgb, var(--rule) 82%, #ffffff 18%);
  box-shadow: 0 8px 22px -22px rgba(18, 23, 35, 0.45);
}

.nav-inner {
  min-height: 4.4rem;
  display: flex;
  gap: 1rem;
  align-items: center;
  justify-content: space-between;
  width: min(1080px, calc(100% - 2rem));
  margin: 0 auto;
}

.nav-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
  color: inherit;
}

.nav-brand img {
  width: 2rem;
  height: 2rem;
}

.nav-brand-name {
  font-family: "Cormorant Garamond", serif;
  font-size: 1.3rem;
  font-weight: 600;
}

.nav-links {
  display: flex;
  gap: 1.25rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.nav-links a {
  color: var(--ink-light);
  text-decoration: none;
  font-family: "IBM Plex Mono", "Courier New", monospace;
  font-size: 0.8rem;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  transition: color 0.2s ease;
}

.footer-links a {
  color: var(--ink-light);
  text-decoration: none;
  font-family: "IBM Plex Mono", "Courier New", monospace;
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.nav-links a:hover,
.footer-links a:hover {
  color: var(--ink);
}

.site-button,
.nav-cta,
.button,
.btn,
.pager-link {
  display: inline-block;
  text-decoration: none;
  color: var(--ink);
  border: 1px solid var(--rule);
  padding: 0.65rem 1.3rem;
  font-family: "IBM Plex Mono", "Courier New", monospace;
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  border-radius: 1.5rem;
  background: #ffffff;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.site-button:hover,
.button:hover,
.btn:hover,
.btn-filled,
.pager-link:hover {
  background: var(--ink);
  color: #ffffff;
  border-color: var(--ink);
}

.site-button--filled,
.nav-cta {
  background: var(--ink);
  color: #ffffff;
  border-color: var(--ink);
}

.site-button--filled:hover,
.nav-cta:hover {
  background: var(--ink-mid);
  border-color: var(--ink-mid);
}

.btn-filled:hover {
  background: var(--ink-mid);
  border-color: var(--ink-mid);
}

.prose-shell {
  padding-top: 2.2rem;
  padding-bottom: 3rem;
}

.prose {
  border: 1px solid var(--rule);
  background: color-mix(in srgb, #ffffff 74%, #edf4f8 26%);
  padding: clamp(1rem, 2.5vw, 2rem);
  overflow-x: auto;
  border-radius: 20px;
  box-shadow:
    0 32px 46px -40px rgba(20, 31, 52, 0.6),
    0 1px 0 0 #ffffff inset;
}

.prose nav[role="doc-toc"] {
  border: 1px solid var(--rule);
  background: color-mix(in srgb, #f4f8fb 80%, white 20%);
  padding: 1rem 1.1rem;
  margin-bottom: 1.5rem;
  border-radius: 14px;
}

.prose nav[role="doc-toc"] ul {
  margin: 0.35rem 0;
  padding-left: 1.1rem;
}

.prose nav[role="doc-toc"] a {
  color: inherit;
  text-decoration: none;
}

.book-landing {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.4rem;
  align-items: center;
}

.book-landing img {
  width: 100%;
  height: auto;
  border: 1px solid var(--rule);
  border-radius: 16px;
  box-shadow: 0 28px 40px -32px rgba(20, 31, 52, 0.62);
}

.book-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.2rem;
}

.book-side-toc {
  border: 1px solid var(--rule);
  border-radius: 16px;
  background: color-mix(in srgb, #f4f8fb 82%, white 18%);
  padding: 0.9rem 0.9rem 0.7rem;
}

.book-side-toc-inner {
  position: sticky;
  top: 5.2rem;
}

.book-side-toc-title {
  font-family: "IBM Plex Mono", "Courier New", monospace;
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-light);
  margin-bottom: 0.6rem;
}

.book-side-toc nav ul {
  margin: 0;
  padding-left: 1.05rem;
}

.book-side-toc li {
  margin: 0.33rem 0;
}

.book-side-toc a {
  text-decoration: none;
  color: var(--ink-mid);
}

.book-side-toc a:hover {
  color: var(--accent);
}

.book-landing h1 {
  margin-top: 0;
}

.book-pager {
  margin-top: 2rem;
  padding-top: 1rem;
  border-top: 1px solid var(--rule);
  display: flex;
  justify-content: space-between;
  gap: 0.7rem;
}

.book-pager-top {
  margin-top: 0;
  margin-bottom: 1.25rem;
}

.prose :is(h1, h2, h3, h4) {
  font-family: "Cormorant Garamond", serif;
  line-height: 1.15;
  color: var(--ink);
}

.prose h1 {
  font-size: clamp(2rem, 6vw, 3.2rem);
}

.prose h2 {
  font-size: clamp(1.55rem, 4vw, 2.2rem);
  margin-top: 2.1rem;
  margin-bottom: 0.5rem;
}

.prose h3 {
  font-family: "IBM Plex Mono", "Courier New", monospace;
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-light);
}

.prose p,
.prose li,
.prose blockquote,
.prose dd,
.prose dt {
  font-size: 1.02rem;
  line-height: 1.72;
}

.prose a {
  color: var(--accent);
  text-underline-offset: 0.16rem;
}

.toc-preface {
  margin-bottom: 0.9rem;
}

.toc-preface a {
  font-weight: 700;
  text-decoration: none;
  color: inherit;
}

.prose h2#chapters {
  font-size: 1.35rem;
  margin-top: 1.4rem;
  margin-bottom: 0.35rem;
}

.prose ul.toc-major {
  border-left: 2px solid var(--rule);
  padding-left: 1rem;
  margin-top: 0.25rem;
  margin-bottom: 1rem;
}

.prose ul.toc-major li {
  margin: 0.35rem 0;
}

.prose ul.toc-major a {
  font-weight: 700;
  text-decoration: none;
  color: inherit;
  font-size: 1.05rem;
}

.prose .toc-minor {
  margin-top: 0.8rem;
  margin-bottom: 1.1rem;
  padding-left: 1.1rem;
}

.prose .toc-minor li {
  margin: 0.3rem 0;
}

.prose .toc-minor a {
  text-decoration: none;
  color: inherit;
}

.prose h1#table-of-contents ~ * a {
  text-decoration: none;
}

.prose ul.toc-major a:hover,
.prose .toc-minor a:hover,
.toc-preface a:hover {
  color: var(--accent);
}

.prose img {
  max-width: 100%;
  height: auto;
  border: 1px solid var(--rule);
}

.prose h1#table-of-figures + ul a,
.prose h1#table-of-contents + ul a {
  text-decoration: none;
  color: inherit;
}

.prose h1#table-of-figures + ul a:hover,
.prose h1#table-of-contents + ul a:hover {
  color: var(--accent);
}

.site-footer {
  border-top: 1px solid var(--rule);
  padding: 1.25rem 0;
  color: var(--ink-light);
  margin-top: auto;
  background: color-mix(in srgb, #eff4f7 78%, var(--parchment) 22%);
}

.footer-row {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  font-family: "IBM Plex Mono", "Courier New", monospace;
  font-size: 0.7rem;
  letter-spacing: 0.04em;
}

.footer-links {
  display: inline-flex;
  gap: 1rem;
}

@media (max-width: 980px) {
  .nav-links {
    display: none;
  }

  .book-layout {
    grid-template-columns: 1fr;
  }

  .book-side-toc {
    order: -1;
  }

  .book-side-toc-inner {
    position: static;
  }

  .book-landing {
    grid-template-columns: 1fr;
  }

  .footer-row {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (min-width: 1080px) {
  .book-layout {
    grid-template-columns: 260px minmax(0, 1fr);
    align-items: start;
  }
}