:root {
  --paper: #f4f0e7;
  --paper-2: #e8e1d3;
  --ink: #191918;
  --muted: #666158;
  --line: #c9c1b2;
  --accent: #a03d2f;
  --max-text: 46rem;
  --serif: Charter, "Iowan Old Style", "Sitka Text", Cambria, Georgia, "Times New Roman", serif;
  --sans: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color-scheme: light;
}

:root[data-theme="dark"] {
  --paper: #171817;
  --paper-2: #20221f;
  --ink: #ece8df;
  --muted: #b8b1a5;
  --line: #3c3d38;
  --accent: #e07a67;
  color-scheme: dark;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #171817;
    --paper-2: #20221f;
    --ink: #ece8df;
    --muted: #b8b1a5;
    --line: #3c3d38;
    --accent: #e07a67;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; background: var(--paper); }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: var(--serif);
  font-size: 16px;
  line-height: 1.68;
  font-kerning: normal;
  font-optical-sizing: auto;
  font-synthesis: none;
  font-variant-ligatures: common-ligatures contextual;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}
body.image-viewer-open { overflow: hidden; }
a { color: inherit; text-decoration-color: var(--accent); text-underline-offset: .18em; }
a:hover { text-decoration-thickness: 2px; }
button, input, select { font: inherit; }
button, select { color: inherit; }

.skip-link { position: absolute; left: -9999px; top: 0; }
.skip-link:focus {
  left: 1rem;
  top: 1rem;
  z-index: 1200;
  padding: .6rem 1rem;
  background: var(--ink);
  color: var(--paper);
}

.site-header {
  min-height: 4.2rem;
  border-bottom: 1px solid var(--line);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  padding: .8rem clamp(1rem, 4vw, 3rem);
  font: 650 .77rem/1.2 var(--sans);
  letter-spacing: .075em;
  text-transform: uppercase;
  background: color-mix(in srgb, var(--paper) 94%, transparent);
  backdrop-filter: blur(10px);
  position: sticky;
  top: 0;
  z-index: 30;
}
.site-header nav { display: flex; gap: 1.15rem; align-items: center; flex-wrap: wrap; justify-content: flex-end; }
.site-header a { text-decoration: none; }
.site-header nav a:hover { color: var(--accent); }
.wordmark { white-space: nowrap; font-weight: 800; }
.theme-toggle {
  border: 1px solid transparent;
  background: transparent;
  color: inherit;
  cursor: pointer;
  font-size: 1.08rem;
  line-height: 1;
  padding: .4rem .45rem;
  border-radius: 999px;
}
.theme-toggle:hover, .theme-toggle:focus-visible { border-color: var(--line); }

.site-footer {
  border-top: 1px solid var(--line);
  margin-top: 6rem;
  padding: 2rem clamp(1rem, 4vw, 3rem) 3rem;
  display: flex;
  justify-content: space-between;
  gap: 2rem;
  font: .8rem/1.5 var(--sans);
  color: var(--muted);
}
.site-footer p { margin: 0; }
.site-footer nav { display: flex; gap: 1rem; flex-wrap: wrap; }

.eyebrow, .chapter-label {
  font: 700 .76rem/1.4 var(--sans);
  letter-spacing: .15em;
  text-transform: uppercase;
  color: var(--accent);
}

.hero {
  min-height: calc(100vh - 4.2rem);
  padding: clamp(4rem, 10vw, 9rem) clamp(1rem, 6vw, 6rem) 5rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
  border-bottom: 1px solid var(--line);
}
.hero h1 {
  font: 850 clamp(3.8rem, 11vw, 10rem)/.84 var(--sans);
  letter-spacing: -.06em;
  margin: 1rem 0 1.5rem;
  max-width: 12ch;
}
.hero h1 span { display: block; }
.hero .subtitle {
  font: 750 clamp(1.25rem, 3vw, 2.5rem)/1.1 var(--sans);
  letter-spacing: .035em;
  margin: 0;
  max-width: 26ch;
}
.hero-actions { display: flex; gap: 1.25rem; align-items: center; flex-wrap: wrap; margin-top: 3rem; font-family: var(--sans); }
.primary-action {
  display: inline-block;
  background: var(--ink);
  color: var(--paper);
  padding: .8rem 1.1rem;
  text-decoration: none;
}
.continue-reading { max-width: 32rem; font-weight: 650; }
.home-intro {
  max-width: 60rem;
  padding: 5rem clamp(1rem, 6vw, 6rem);
  font-size: clamp(1.42rem, 2.45vw, 2.08rem);
  line-height: 1.46;
  letter-spacing: -.01em;
}
.home-intro p { margin: 0 0 1.2em; }
.home-links { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.home-links a { padding: 2rem clamp(1rem, 4vw, 3rem); text-decoration: none; font: 650 1rem/1.3 var(--sans); border-right: 1px solid var(--line); }
.home-links a:last-child { border: 0; }
.home-links span { display: block; font-size: .7rem; text-transform: uppercase; letter-spacing: .12em; color: var(--muted); margin-bottom: .45rem; }

.chapter {
  max-width: var(--max-text);
  margin: 0 auto;
  padding: clamp(4.2rem, 8vw, 7.3rem) 1.25rem 0;
}
.chapter-header { margin-bottom: 3.8rem; }
.chapter-header h1 {
  font: 780 clamp(2.7rem, 6vw, 4.8rem)/1 var(--sans);
  letter-spacing: -.045em;
  margin: .7rem 0 0;
  text-wrap: balance;
}
.chapter-body {
  font-size: clamp(1.13rem, 1.25vw, 1.29rem);
  line-height: 1.7;
  hanging-punctuation: first allow-end last;
  hyphens: auto;
}
.chapter-body p { margin: 0 0 1.42em; orphans: 3; widows: 3; text-wrap: pretty; }
.chapter-body p:empty { display: none; }
.chapter-body > p:first-of-type::first-letter {
  float: left;
  font-size: 4.1em;
  line-height: .78;
  padding: .11em .09em 0 0;
  font-weight: 600;
}
.chapter-body h2, .chapter-body h3, .chapter-body h4 {
  font-family: var(--sans);
  line-height: 1.2;
  letter-spacing: -.02em;
  margin: 2.8rem 0 1rem;
  text-wrap: balance;
}
.chapter-body blockquote {
  margin: 2.2rem 0;
  padding: .15rem 0 .15rem 1.2rem;
  border-left: 3px solid var(--accent);
  color: var(--muted);
}
.chapter-body img, .reference-page img {
  display: block;
  width: auto;
  max-width: 100%;
  height: auto;
  max-height: 80vh;
  margin: 2rem auto 1rem;
  object-fit: contain;
  background: var(--paper-2);
}
.chapter-body img.zoomable-image, .reference-page img.zoomable-image {
  cursor: zoom-in;
  outline: 1px solid transparent;
  outline-offset: 5px;
  transition: outline-color .16s ease, opacity .16s ease;
}
.chapter-body img.zoomable-image:hover, .chapter-body img.zoomable-image:focus-visible,
.reference-page img.zoomable-image:hover, .reference-page img.zoomable-image:focus-visible {
  outline-color: var(--accent);
}
.chapter-body figure { margin: 3.2rem 0; padding: 1.25rem 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.chapter-body figcaption {
  font: .89rem/1.58 var(--sans);
  color: var(--muted);
  margin-top: 1rem;
}
.chapter-body table { display: block; overflow-x: auto; border-collapse: collapse; margin: 2rem 0; font-size: .92em; }
.chapter-body td, .chapter-body th { border: 1px solid var(--line); padding: .5rem .65rem; }

.chapter-nav {
  margin-top: 5rem;
  padding: 2rem 0;
  border-top: 1px solid var(--line);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  font-family: var(--sans);
}
.chapter-nav div { display: flex; flex-direction: column; gap: .35rem; }
.chapter-nav .next { text-align: right; align-items: flex-end; }
.chapter-nav span { font-size: .7rem; text-transform: uppercase; letter-spacing: .12em; color: var(--muted); }
.chapter-nav a { font-weight: 700; line-height: 1.25; }

.reading-progress-track {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  z-index: 80;
  pointer-events: none;
}
.reading-progress-track span {
  display: block;
  width: 100%;
  height: 100%;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left center;
}
.reader-tools {
  position: fixed;
  right: max(1rem, env(safe-area-inset-right));
  bottom: max(1rem, env(safe-area-inset-bottom));
  z-index: 25;
  display: flex;
  align-items: center;
  gap: .55rem;
  padding: .55rem;
  border: 1px solid var(--line);
  background: color-mix(in srgb, var(--paper) 95%, transparent);
  box-shadow: 0 8px 30px rgba(0, 0, 0, .12);
  backdrop-filter: blur(10px);
  font: 650 .72rem/1.2 var(--sans);
}
.reader-tools button, .reader-tools select {
  border: 1px solid var(--line);
  background: var(--paper);
  padding: .48rem .62rem;
  cursor: pointer;
}
.reader-tools button[aria-pressed="true"] { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.reader-tools label { display: flex; align-items: center; gap: .4rem; white-space: nowrap; }
.reader-tools__advance input { accent-color: var(--accent); }

.image-viewer[hidden] { display: none; }
.image-viewer {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: grid;
  grid-template-rows: auto minmax(0, 1fr) auto;
  background: rgba(10, 10, 10, .94);
  color: #fff;
}
.image-viewer__bar {
  min-height: 3.4rem;
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: center;
  padding: .65rem max(1rem, env(safe-area-inset-right)) .65rem max(1rem, env(safe-area-inset-left));
  font-family: var(--sans);
}
.image-viewer__controls { display: flex; gap: .4rem; }
.image-viewer button {
  border: 1px solid rgba(255,255,255,.4);
  background: rgba(0,0,0,.35);
  color: #fff;
  min-width: 2.5rem;
  padding: .45rem .7rem;
  cursor: pointer;
}
.image-viewer button:focus-visible { outline: 2px solid #fff; outline-offset: 2px; }
.image-viewer__stage {
  min-height: 0;
  overflow: hidden;
  display: grid;
  place-items: center;
  touch-action: none;
  cursor: zoom-in;
}
.image-viewer__stage.is-zoomed { cursor: grab; }
.image-viewer__stage.is-zoomed:active { cursor: grabbing; }
.image-viewer__image {
  display: block;
  max-width: 94vw;
  max-height: calc(100vh - 9rem);
  width: auto;
  height: auto;
  user-select: none;
  transform-origin: 0 0;
  will-change: transform;
}
.image-viewer__caption {
  margin: 0;
  padding: .7rem max(1rem, env(safe-area-inset-right)) max(.9rem, env(safe-area-inset-bottom)) max(1rem, env(safe-area-inset-left));
  color: rgba(255,255,255,.78);
  font: .82rem/1.45 var(--sans);
  text-align: center;
  max-height: 5.5rem;
  overflow: auto;
}

.contents-page, .search-page, .reference-page, .not-found { max-width: 64rem; margin: 0 auto; padding: clamp(4rem, 8vw, 7rem) 1.25rem; }
.contents-page header, .search-page header { margin-bottom: 3rem; }
.contents-page h1, .search-page h1, .reference-page > h1, .not-found h1 {
  font: 780 clamp(3rem, 7vw, 5.5rem)/.96 var(--sans);
  letter-spacing: -.045em;
  margin: .5rem 0;
  text-wrap: balance;
}
.contents-list { list-style: none; padding: 0; margin: 0; border-top: 1px solid var(--line); }
.contents-list li { border-bottom: 1px solid var(--line); }
.contents-list a { display: grid; grid-template-columns: 8rem 1fr; gap: 1rem; padding: 1rem 0; text-decoration: none; align-items: baseline; }
.contents-list span { font: .72rem/1.3 var(--sans); color: var(--muted); text-transform: uppercase; letter-spacing: .08em; }
.contents-list strong { font: 700 1.1rem/1.25 var(--sans); }
.reference-page { max-width: var(--max-text); font-size: 1.05rem; line-height: 1.68; }
.reference-page h2, .reference-page h3 { font-family: var(--sans); line-height: 1.2; margin: 2.5rem 0 1rem; }
.reference-page p { margin: 0 0 1.2rem; }
.reference-page a { overflow-wrap: anywhere; }

#book-search label { display: block; font: 650 .8rem/1.3 var(--sans); text-transform: uppercase; letter-spacing: .08em; margin-bottom: .55rem; }
.search-field { display: flex; }
.search-field input { flex: 1; min-width: 0; border: 1px solid var(--line); background: var(--paper); color: var(--ink); padding: .8rem 1rem; border-radius: 0; }
.search-field button { border: 1px solid var(--ink); background: var(--ink); color: var(--paper); padding: .8rem 1.2rem; cursor: pointer; }
.search-status { font-family: var(--sans); color: var(--muted); min-height: 1.5em; }
.search-results { margin-top: 2rem; }
.search-result { padding: 1.4rem 0; border-top: 1px solid var(--line); }
.search-result h2 { font: 700 1.15rem/1.3 var(--sans); margin: 0 0 .5rem; }
.search-result p { margin: 0; color: var(--muted); }

:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }

@media (max-width: 820px) {
  .site-header { align-items: flex-start; flex-direction: column; gap: .65rem; }
  .site-header nav { width: 100%; justify-content: flex-start; gap: .7rem 1rem; }
  .wordmark { white-space: normal; }
  .hero { min-height: 76vh; }
  .hero h1 { font-size: clamp(3.3rem, 18vw, 6rem); }
  .home-links { grid-template-columns: 1fr; }
  .home-links a { border-right: 0; border-bottom: 1px solid var(--line); }
  .contents-list a { grid-template-columns: 6.6rem 1fr; }
  .site-footer { flex-direction: column; }
  .chapter-nav { grid-template-columns: 1fr; }
  .chapter-nav .next { text-align: left; align-items: flex-start; }
  .reader-tools { left: max(.75rem, env(safe-area-inset-left)); right: max(.75rem, env(safe-area-inset-right)); bottom: max(.65rem, env(safe-area-inset-bottom)); justify-content: center; flex-wrap: wrap; }
}

@media (max-width: 520px) {
  body { font-size: 16px; }
  .site-header { position: relative; padding-top: .9rem; padding-bottom: .9rem; }
  .site-header nav { font-size: .68rem; }
  .chapter, .reference-page { padding-left: 1rem; padding-right: 1rem; }
  .chapter-body { font-size: 1.15rem; line-height: 1.72; }
  .chapter-header { margin-bottom: 3rem; }
  .contents-list a { grid-template-columns: 1fr; gap: .25rem; }
  .reader-tools { gap: .4rem; padding: .45rem; font-size: .68rem; }
  .reader-tools__speed { display: flex; }
  .reader-tools__speed select { max-width: 6.4rem; padding: .4rem .45rem; }
  .reader-tools__advance { font-size: .68rem; }
  .image-viewer__image { max-width: 100vw; max-height: calc(100vh - 8rem); }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .001ms !important; animation-duration: .001ms !important; animation-iteration-count: 1 !important; }
  .reader-tools__auto { display: none; }
}

@media print {
  .site-header, .site-footer, .chapter-nav, .theme-toggle, .reader-tools, .reading-progress-track, .image-viewer { display: none !important; }
  :root { --paper: white; --ink: black; --muted: #444; --line: #bbb; --accent: #000; }
  body { font-size: 11pt; }
  .chapter, .reference-page { max-width: none; padding: 0; }
  a { text-decoration: none; color: black; }
}