:root {
  color-scheme: light;
  --color-black: #050607;
  --color-paper: #efefea;
  --color-warm-ink: #6b5e57;
  --color-cobalt: #003cff;
  --color-signal-green: #7fe38a;
  --color-white: #ffffff;
  --surface-light: var(--color-paper);
  --text-light-secondary: rgba(107, 94, 87, .72);
  --paper: var(--color-paper);
  --ink: var(--color-warm-ink);
  --black: var(--color-black);
  --blue: var(--color-cobalt);
  --line: rgba(107, 94, 87, 0.38);
  --faint: rgba(107, 94, 87, 0.13);
  --font-sans: "IBM Plex Sans", Arial, sans-serif;
  --font-mono: "IBM Plex Mono", monospace;
  --sans: var(--font-sans);
  --mono: var(--font-mono);
  --type-display-size: 32px;
  --type-display-line: 1.12;
  --type-title-size: 28px;
  --type-title-line: 1.15;
  --type-section-size: 22px;
  --type-section-line: 1.28;
  --type-subhead-size: 18px;
  --type-subhead-line: 1.36;
  --type-lead-size: 18px;
  --type-lead-line: 1.5;
  --type-body-size: 16px;
  --type-body-line: 1.66;
  --type-small-size: 14px;
  --type-small-line: 1.35;
  --type-meta-size: 10px;
  --type-meta-line: 1.35;
  --type-micro-size: 9px;
  --type-micro-line: 1.3;
  --type-display-weight: 400;
  --type-title-weight: 400;
  --type-section-weight: 500;
  --type-subhead-weight: 500;
  --type-lead-weight: 400;
  --type-body-weight: 400;
  --type-meta-weight: 400;
  --type-system-weight: 500;
  --type-display-tracking: -.02em;
  --type-section-tracking: -.015em;
  --type-subhead-tracking: -.008em;
  --type-system-tracking: .045em;
  --type-nav-tracking: .055em;
  --type-search-display-size: 24px;
  --global-header-height: 64px;
  --global-header-padding-x: 14px;
  --global-header-gap: 18px;
  --global-brand-lockup-width: 310px;
  --global-brand-lockup-min-width: 210px;
  --global-logo-width: 126px;
  --global-logo-height: 50px;
  --global-nav-gap: clamp(.18rem, .5vw, .35rem);
  --global-nav-min-height: 44px;
  --global-nav-padding-x: 12px;
  --global-nav-font-size: 12px;
  --global-nav-line-height: 1;
  --global-nav-letter-spacing: .055em;
  --global-header-border-width: 1px;
  --global-mobile-logo-size: 48px;
  --global-mobile-menu-size: 44px;
}

/* P7.12D — BOOKS mappings into the global semantic typography system. */
.books-nav .command,
.archive-section-nav a,
.book-route-strip a,
.books-mode-nav a {
  font-family: var(--mono);
  font-size: var(--type-meta-size);
  line-height: var(--type-meta-line);
  letter-spacing: var(--type-nav-tracking);
}
.books-index-header h1,
.book-reader-title {
  font: var(--type-title-weight) var(--type-title-size)/var(--type-title-line) var(--sans);
  letter-spacing: var(--type-display-tracking);
}
.book-route-title {
  font: var(--type-subhead-weight) var(--type-subhead-size)/var(--type-subhead-line) var(--sans);
  letter-spacing: var(--type-subhead-tracking);
}
.book-route-meta,
.book-related-description {
  font: var(--type-body-weight) var(--type-small-size)/var(--type-small-line) var(--sans);
}
.book-reader-meta-line,
.book-route-meta-line,
.book-section-label,
.book-section-nav a,
.book-concept-link,
.book-pager-direction,
.book-related-label,
.tracebar {
  font-family: var(--mono);
  font-size: var(--type-meta-size);
  line-height: var(--type-meta-line);
  letter-spacing: var(--type-system-tracking);
}
.book-reader-lead {
  font: 300 var(--type-lead-size)/var(--type-lead-line) var(--sans);
  letter-spacing: var(--type-section-tracking);
}
.book-document {
  font: var(--type-body-weight) var(--type-body-size)/var(--type-body-line) var(--sans);
}
.book-document p,
.book-document li { font-size: var(--type-body-size); line-height: var(--type-body-line); }
.book-document h2 {
  font: var(--type-section-weight) var(--type-section-size)/var(--type-section-line) var(--sans);
  letter-spacing: var(--type-section-tracking);
}
.book-document h3 {
  font: var(--type-subhead-weight) var(--type-subhead-size)/var(--type-subhead-line) var(--sans);
  letter-spacing: var(--type-subhead-tracking);
}
.book-document h4 {
  font: var(--type-system-weight) var(--type-meta-size)/var(--type-meta-line) var(--mono);
  letter-spacing: var(--type-system-tracking);
}
.book-document code,
.book-document pre,
.book-apparatus {
  font-family: var(--mono);
  font-size: var(--type-small-size);
  line-height: var(--type-small-line);
}
.book-interlude,
.book-priest-colophon {
  font-family: var(--mono);
  font-size: var(--type-body-size);
  line-height: var(--type-body-line);
}
.book-interlude p,
.book-interlude li,
.book-priest-colophon p,
.book-priest-colophon li { font-size: inherit; line-height: inherit; }
.book-pager-title {
  font: var(--type-section-weight) var(--type-section-size)/var(--type-section-line) var(--sans);
  letter-spacing: var(--type-section-tracking);
}

.books-search-dialog .search-palette__header h2,
.books-search-dialog .search-palette__hint,
.books-search-dialog .search-palette__section-label,
.books-search-dialog .search-result__meta,
.books-search-dialog .search-palette__footer {
  font-family: var(--mono);
  font-size: var(--type-meta-size);
  line-height: var(--type-meta-line);
  font-weight: var(--type-system-weight);
  letter-spacing: var(--type-system-tracking);
}
.books-search-dialog .search-palette__input {
  font: var(--type-body-weight) var(--type-search-display-size)/1.18 var(--sans);
}
.books-search-dialog .search-result__title,
.books-search-dialog .search-empty span {
  font: var(--type-body-weight) var(--type-small-size)/var(--type-small-line) var(--sans);
}

@media (max-width: 767px) {
  :root {
    --type-display-size: 29px;
    --type-section-size: 21px;
    --type-lead-size: 17px;
    --type-small-size: 13px;
    --type-search-display-size: 19px;
  }
}

/* P7.12E — strict global semantic color system. */
.book-interlude,
.books-dark-interlude { background: var(--color-black); color: var(--color-white); }
.books-search-dialog.search-palette,
.books-search-dialog .search-palette__panel,
.books-search-dialog .search-palette__content,
.books-search-dialog .search-results.search-palette__results {
  background: var(--surface-light);
  color: var(--color-warm-ink);
}
.books-search-dialog .search-palette__header h2,
.books-search-dialog .search-palette__input,
.books-search-dialog .search-result,
.books-search-dialog .search-result__title,
.books-search-dialog .search-empty { color: var(--color-warm-ink); }
.books-search-dialog .search-palette__close,
.books-search-dialog .search-palette__clear { color: rgba(107,94,87,.72); }
.books-search-dialog .search-palette__input::placeholder,
.books-search-dialog .search-result__meta,
.books-search-dialog .search-palette__footer { color: rgba(107,94,87,.58); }
.books-search-dialog .search-palette__hint { color: rgba(107,94,87,.52); }
.books-search-dialog .search-palette__section-label,
.books-search-dialog .search-empty span { color: rgba(107,94,87,.62); }

* { box-sizing: border-box; }

html {
  min-width: 0;
  background: var(--paper);
  color: var(--ink);
  scroll-behavior: smooth;
}

body {
  min-width: 0;
  margin: 0;
  overflow-wrap: anywhere;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
}

a { color: inherit; }
button, input, select, textarea { font: inherit; }
body strong,
body b { font-weight: 500; }

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

.skip-link {
  position: fixed;
  z-index: 30;
  top: 0;
  left: 1rem;
  padding: 0.75rem 1rem;
  background: var(--blue);
  color: var(--paper);
  font: 500 10px/1 var(--mono);
  transform: translateY(-120%);
}

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

/* SHARED CHROME */

.books-topbar {
  position: sticky;
  z-index: 20;
  top: 0;
  min-width: 0;
  max-width: 100%;
  height: var(--global-header-height);
  min-height: var(--global-header-height);
  display: flex;
  align-items: center;
  gap: var(--global-header-gap);
  padding: 0 var(--global-header-padding-x);
  border-bottom: var(--global-header-border-width) solid var(--line);
  background: var(--paper);
}

.books-brand-lockup {
  flex: 0 1 var(--global-brand-lockup-width);
  min-width: var(--global-brand-lockup-min-width);
  height: var(--global-logo-height);
  display: flex;
  align-items: center;
  gap: 12px;
  overflow: hidden;
  color: inherit;
}

.books-logo {
  display: flex;
  align-items: center;
  flex: 0 0 var(--global-logo-width);
  min-width: var(--global-logo-width);
  width: var(--global-logo-width);
  height: var(--global-logo-height);
  overflow: hidden;
  color: inherit;
  text-decoration: none;
}

.books-logo img {
  flex: 0 0 var(--global-logo-width);
  display: block;
  width: var(--global-logo-width);
  height: var(--global-logo-height);
  object-fit: contain;
  object-position: left center;
}

.books-logo:focus-visible {
  outline: 1px solid var(--blue);
  outline-offset: -2px;
}

.books-nav {
  min-width: 0;
  max-width: 100%;
  flex: 1 1 auto;
  display: flex;
  justify-content: flex-start;
  gap: var(--global-nav-gap);
  overflow-x: auto;
  overflow-y: hidden;
  overscroll-behavior-inline: contain;
  scrollbar-width: none;
}

.books-nav::-webkit-scrollbar { display: none; }

.books-nav .command {
  flex: 0 0 auto;
  min-height: var(--global-nav-min-height);
  padding: 0 var(--global-nav-padding-x);
  font: 400 var(--global-nav-font-size)/var(--global-nav-line-height) var(--mono);
  letter-spacing: var(--global-nav-letter-spacing);
  white-space: nowrap;
  text-decoration: none;
}

.books-nav a.command {
  display: inline-flex;
  align-items: center;
  color: inherit;
}

.books-nav button.command {
  border: 0;
  background: transparent;
  color: inherit;
  cursor: pointer;
}

.books-nav .command:first-child { margin-left: 0; }
.books-nav [data-books-signal] { margin-left: auto; }

.books-nav .command:hover {
  background: var(--faint);
  color: var(--ink);
}

.books-nav .command:focus-visible {
  background: transparent;
  color: var(--blue);
  outline: 1px solid var(--blue);
  outline-offset: -2px;
}

.books-nav .command[aria-current="page"] {
  color: var(--blue);
  border-bottom: 1px solid var(--blue);
  font-weight: 500;
}

.mobile-menu-toggle,
.mobile-menu-backdrop,
.mobile-global-menu { display: none; }

.book-route-strip {
  position: sticky;
  z-index: 15;
  top: 64px;
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  min-height: 42px;
  border-bottom: 1px solid var(--line);
  background: rgba(239, 239, 234, 0.96);
  backdrop-filter: blur(12px);
}

.book-route-strip a {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 8px;
  align-items: center;
  min-width: 0;
  padding: 9px 12px;
  border-right: 1px solid var(--faint);
  font: 500 9px/1 var(--mono);
  text-decoration: none;
  scroll-snap-align: center;
}

.book-route-strip a:last-child { border-right: 0; }

.book-route-strip span { color: var(--ink); white-space: nowrap; }

.book-route-strip small {
  overflow: visible;
  font: 500 8px/1.15 var(--mono);
  text-overflow: clip;
  white-space: normal;
}

.book-route-strip a:hover,
.book-route-strip a:focus-visible,
.book-route-strip a[aria-current="page"] {
  background: var(--blue);
  color: var(--paper);
  outline: 0;
}

.book-route-strip a:hover span,
.book-route-strip a:focus-visible span,
.book-route-strip a[aria-current="page"] span { color: var(--paper); }

/* BOOKS INDEX */

.books-index-main {
  min-width: 0;
  padding: clamp(46px, 6vw, 92px) clamp(20px, 5vw, 76px) 90px;
}

.book-route-list {
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
  list-style: none;
}

.book-route-item {
  position: relative;
  border-bottom: 1px solid var(--line);
}

.book-route-link {
  position: relative;
  display: grid;
  grid-template-columns: 74px minmax(0, 1fr) 180px;
  gap: 26px;
  align-items: center;
  min-height: 132px;
  padding: 16px 0;
  text-decoration: none;
}

.book-route-link::before {
  position: absolute;
  z-index: -1;
  inset: 0 -24px;
  background: var(--blue);
  content: "";
  transform: scaleY(0);
  transform-origin: bottom;
  transition: transform 160ms ease;
}

.book-route-link:hover::before,
.book-route-link:focus-visible::before { transform: scaleY(1); }

.book-route-link:hover,
.book-route-link:focus-visible {
  color: var(--paper);
  outline: 0;
}

.book-route-number {
  color: var(--blue);
  font: 500 14px/1 var(--mono);
}

.book-route-copy {
  display: grid;
  gap: 12px;
  min-width: 0;
}

.book-route-title {
  color: var(--ink);
  font-size: 28px;
  font-weight: 400;
  letter-spacing: -0.025em;
  line-height: 1.05;
}

.book-route-meta {
  font: 500 10px/1.4 var(--mono);
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.book-route-state {
  display: flex;
  gap: 16px;
  align-items: center;
  justify-content: flex-end;
  color: var(--ink);
  font: 500 9px/1 var(--mono);
  letter-spacing: 0.08em;
}

.book-route-state > span { font-size: 18px; }

.book-route-item[data-route-status="read"] .book-route-state strong { opacity: 0.58; }

.book-route-link:hover .book-route-number,
.book-route-link:hover .book-route-title,
.book-route-link:hover .book-route-state,
.book-route-link:focus-visible .book-route-number,
.book-route-link:focus-visible .book-route-title,
.book-route-link:focus-visible .book-route-state { color: var(--paper); }

/* READER */

.book-reader-layout {
  display: grid;
  grid-template-columns: clamp(132px, 12vw, 176px) minmax(0, 1fr);
  min-height: calc(100vh - 106px);
}

.book-section-label { opacity: 0.64; }

.book-reader-main {
  min-width: 0;
  padding: clamp(52px, 6vw, 92px) clamp(24px, 5vw, 78px) 110px;
}

.book-article {
  width: 100%;
  max-width: 1180px;
}

.book-reader-header {
  max-width: 900px;
  margin-bottom: clamp(48px, 6vw, 76px);
}

.book-eyebrow {
  margin: 0;
  color: var(--blue);
  font: 500 9px/1.3 var(--mono);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.book-reader-title {
  max-width: 920px;
  margin: 22px 0 0;
  color: var(--ink);
  font-size: 28px;
  font-weight: 400;
  font-family: var(--sans);
  letter-spacing: -.02em;
  line-height: 1.15;
  overflow-wrap: normal;
  word-break: normal;
}

.book-reader-lead {
  max-width: 760px;
  margin: clamp(34px, 4vw, 52px) 0 0;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  color: var(--ink);
  font-size: clamp(21px, 2vw, 28px);
  font-weight: 300;
  letter-spacing: -0.018em;
  line-height: 1.4;
}

.book-reading-grid {
  display: grid;
  grid-template-columns: minmax(0, 720px) minmax(220px, 280px);
  gap: clamp(48px, 6vw, 88px);
  align-items: stretch;
}

.book-reading-column { min-width: 0; }

.book-rubricator {
  align-self: stretch;
  min-width: 0;
  border-left: 1px solid var(--line);
  padding-left: 18px;
}

.book-rubricator-sticky {
  position: sticky;
  top: 134px;
  max-height: calc(100vh - 158px);
  overflow-y: auto;
  scrollbar-width: thin;
}

.book-section-nav,
.book-concept-nav {
  display: grid;
  border-top: 1px solid var(--line);
}

.book-apparatus-nav,
.book-concept-nav { margin-top: 34px; }

.book-section-label {
  padding: 13px 0 10px;
  color: var(--ink);
  font: 500 8px/1.2 var(--mono);
  letter-spacing: 0.09em;
}

.book-section-nav a {
  display: grid;
  grid-template-columns: 24px minmax(0, 1fr);
  gap: 8px;
  min-height: 42px;
  padding: 9px 0;
  border-top: 1px solid var(--faint);
  color: var(--ink);
  font: 500 9px/1.4 var(--mono);
  text-decoration: none;
}

.book-section-nav a span { color: var(--blue); }
.book-section-nav a strong { font-weight: 500; }

.book-section-nav a:hover,
.book-section-nav a:focus-visible,
.book-section-nav a[aria-current="location"] {
  color: var(--blue);
  background: rgba(0, 60, 255, 0.035);
  box-shadow: inset 2px 0 0 var(--blue);
  outline: 0;
}

.book-section-nav a:hover,
.book-section-nav a:focus-visible,
.book-section-nav a[aria-current="location"] {
  padding-left: 8px;
  padding-right: 6px;
}

.book-concept-link {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 10px;
  align-items: center;
  min-height: 40px;
  padding: 9px 0;
  border-top: 1px solid var(--faint);
  color: var(--ink);
  font: 500 10px/1.4 var(--mono);
  text-decoration: none;
}

.book-concept-link i {
  color: var(--blue);
  font-style: normal;
}

.book-concept-link:hover,
.book-concept-link:focus-visible { color: var(--blue); }
.book-concept-unresolved { opacity: 0.48; }

.book-image-plate {
  width: min(100%, 680px);
  margin: 0 0 68px;
}

.book-image-plate img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: contain;
}

.book-image-plate figcaption {
  margin-top: 10px;
  padding-top: 8px;
  border-top: 1px solid var(--line);
  font: 500 8px/1.45 var(--mono);
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.book-document {
  max-width: 720px;
  color: var(--ink);
  scroll-margin-top: 136px;
}

.book-document h2,
.book-document h3,
.book-document h4 {
  color: var(--ink);
  font-weight: 400;
  scroll-margin-top: 136px;
}

.book-document h2 {
  margin: 62px 0 20px;
  font-size: 20px;
  letter-spacing: -0.01em;
  line-height: 1.28;
}

.book-document h3 {
  margin: 48px 0 16px;
  font-size: 18px;
  letter-spacing: 0;
  line-height: 1.34;
}

.book-document h4 {
  margin: 38px 0 14px;
  font-size: 16px;
  line-height: 1.35;
}

.book-document p,
.book-document li {
  font-size: 18px;
  line-height: 1.72;
}

.book-document p,
.book-document ul,
.book-document ol,
.book-document blockquote,
.book-document pre,
.book-document table {
  margin-top: 0;
  margin-bottom: 1.55rem;
}

.book-document ul,
.book-document ol { padding-left: 1.35rem; }
.book-document li + li { margin-top: 0.42rem; }

.book-document blockquote {
  margin: 52px 0;
  padding: 20px 0 20px 24px;
  border-left: 1px solid var(--ink);
  color: var(--ink);
}

.book-document blockquote > :last-child { margin-bottom: 0; }

.book-document code,
.book-document pre,
.book-crossref,
.book-interlude,
.book-apparatus { font-family: var(--mono); }

.book-document code {
  color: var(--ink);
  font-size: 0.88em;
}

.book-document pre {
  max-width: 100%;
  overflow-x: auto;
  padding: 22px 0;
  border-block: 1px solid var(--line);
  color: var(--ink);
  font: 400 14px/1.62 var(--mono);
  white-space: pre;
}

.book-document pre.book-formula {
  color: var(--blue);
  font-size: 15px;
  font-weight: 500;
}

.book-document pre.book-formula code { color: inherit; }

.book-document hr {
  margin: 68px 0;
  border: 0;
  border-top: 1px solid var(--line);
}

[data-book-route-id="great-error"] .book-system-diagram { margin-bottom: 12px; }
[data-book-route-id="great-error"] .book-system-diagram + hr { margin: 16px 0 22px; }
[data-book-route-id="great-error"] .book-system-diagram + hr + p { margin-top: 0; }

.book-document table {
  display: block;
  max-width: 100%;
  overflow-x: auto;
  border-collapse: collapse;
}

.book-document th,
.book-document td {
  padding: 9px 18px 9px 0;
  border-bottom: 1px solid var(--line);
  font-size: 15px;
  text-align: left;
  vertical-align: top;
}

.book-crossref {
  border-bottom: 1px dotted currentColor;
  color: var(--ink);
  text-decoration: none;
}

.book-crossref:hover,
.book-crossref:focus-visible { color: var(--blue); }

.book-apparatus {
  margin: 62px 0;
  padding: 2px 0 2px 20px;
  border-left: 1px solid var(--ink);
  color: var(--ink);
}

.book-apparatus h2 {
  margin: 0 0 18px;
  color: var(--blue);
  font: 500 9px/1.3 var(--mono);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.book-apparatus p,
.book-apparatus li {
  font: 400 14px/1.62 var(--mono);
}

.book-apparatus > :last-child { margin-bottom: 0; }

.book-apparatus .book-apparatus-label + p { margin-top: 0; }
.book-apparatus em { color: inherit; }

.book-priest-colophon {
  padding: clamp(26px, 4vw, 42px);
  border: 0;
  background: var(--black);
  color: var(--paper);
}

.book-priest-colophon h2,
.book-priest-colophon p,
.book-priest-colophon li,
.book-priest-colophon .book-crossref { color: var(--paper); }
.book-priest-colophon h2 { color: var(--blue); }
.book-priest-colophon blockquote { border-left-color: var(--paper); color: var(--paper); }

.book-interlude {
  margin: 72px 0;
  padding: clamp(28px, 5vw, 54px);
  background: var(--black);
  color: var(--paper);
  font-family: var(--mono);
}

.book-interlude h2 {
  margin-top: 0;
  color: var(--paper);
  font: 500 clamp(28px, 4vw, 42px)/1 var(--sans);
  letter-spacing: -0.04em;
}

.book-interlude blockquote {
  margin: 34px 0;
  padding: 0;
  border: 0;
  color: var(--paper);
}

.book-interlude p,
.book-interlude li { color: var(--paper); }
.book-interlude code { color: var(--blue); }
.book-interlude .book-crossref { color: var(--paper); }

.book-related {
  max-width: 720px;
  margin-top: 84px;
  padding: 20px 0 0;
  border-top: 1px solid var(--line);
}

.book-related-label {
  color: var(--blue);
  font: 500 9px/1.4 var(--mono);
  letter-spacing: 0.1em;
}

.book-related-node {
  display: block;
  margin-top: 12px;
  color: var(--ink);
  font-size: 24px;
  font-weight: 400;
  letter-spacing: -0.025em;
  line-height: 1.1;
}

.book-related-description {
  display: block;
  margin-top: 8px;
  font-size: 15px;
  line-height: 1.5;
}

.book-pager {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 52px;
  max-width: 760px;
  margin-top: 104px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
}

.book-pager a,
.book-pager > span {
  display: flex;
  flex-direction: column;
  min-width: 0;
  min-height: 44px;
  font: 500 9px/1.45 var(--mono);
  letter-spacing: 0.07em;
  text-decoration: none;
}

.book-pager-next { text-align: right; }
.book-pager-direction { color: var(--ink); }

.book-pager-title {
  display: block;
  margin-top: 10px;
  color: var(--ink);
  font: 500 25px/1.05 var(--sans);
  letter-spacing: -0.035em;
}

.book-pager a:hover .book-pager-title,
.book-pager a:focus-visible .book-pager-title { color: var(--blue); }
.book-pager-empty { opacity: 0.42; }

[data-book-route-id="voice"] .book-document { max-width: 650px; }
[data-book-route-id="voice"] .book-document p { line-height: 1.6; }

@media (max-width: 1100px) {
  .book-route-link {
    grid-template-columns: 58px minmax(0, 1fr) 130px;
  }

  .book-reading-grid {
    grid-template-columns: minmax(0, 680px) minmax(200px, 240px);
    gap: 38px;
  }
}

@media (max-width: 900px) {
  .book-route-strip {
    --route-item-width: clamp(158px, 34vw, 210px);
    display: flex;
    grid-template-columns: none;
    overflow-x: auto;
    scroll-snap-type: x proximity;
    scrollbar-width: thin;
  }

  .book-route-strip::after {
    flex: 0 0 max(0px, calc((100vw - var(--route-item-width)) / 2));
    content: "";
  }

  .book-route-strip a {
    flex: 0 0 var(--route-item-width);
    grid-template-columns: 28px minmax(0, 1fr);
  }

  .book-reading-grid { grid-template-columns: minmax(0, 1fr); }

  .book-rubricator {
    order: -1;
    padding-left: 0;
    border-left: 0;
    border-block: 1px solid var(--line);
  }

  .book-rubricator-sticky {
    position: static;
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 28px;
    max-height: none;
    overflow: visible;
  }

  .book-apparatus-nav,
  .book-concept-nav { margin-top: 0; }
  .book-document { max-width: 760px; }
}

@media (max-width: 820px) {
  .book-reader-layout { display: block; }
}

@media (max-width: 620px) {
  .book-route-strip {
    --route-item-width: 148px;
    display: flex;
    overflow-x: auto;
    grid-template-columns: none;
    scroll-snap-type: x mandatory;
    scrollbar-width: none;
  }

  .book-route-strip a {
    flex: 0 0 var(--route-item-width);
    min-height: 52px;
    grid-template-columns: 24px minmax(0, 1fr);
    gap: 8px;
    padding: 8px 10px;
    text-align: left;
  }

  .book-route-strip small {
    display: block;
    overflow: visible;
    font-size: 8px;
    line-height: 1.15;
    text-overflow: clip;
    white-space: normal;
  }

  .book-route-strip::-webkit-scrollbar { display: none; }

  .books-index-main,
  .book-reader-main { padding: 42px 18px 76px; }

  .book-route-link {
    grid-template-columns: 34px minmax(0, 1fr) 26px;
    gap: 12px;
    min-height: 44px;
    padding: 24px 0;
  }

  .book-route-link::before { inset: 0 -18px; }
  .book-route-title { font-size: clamp(29px, 10vw, 42px); }
  .book-route-meta { font-size: 8px; }
  .book-route-state strong { display: none; }
  .book-route-state { justify-content: flex-end; }

  .book-reader-title {
    font-size: 28px;
    letter-spacing: -.02em;
  }

  .book-reader-lead {
    margin-top: 30px;
    font-size: 20px;
  }

  .book-reader-header { margin-bottom: 42px; }

  .book-rubricator-sticky {
    display: block;
    padding-bottom: 20px;
  }

  .book-section-nav,
  .book-concept-nav { grid-template-columns: minmax(0, 1fr); }
  .book-concept-nav { margin-top: 24px; }

  .book-image-plate {
    width: 100%;
    margin-bottom: 54px;
  }

  .book-document p,
  .book-document li { font-size: 17px; }

  .book-document h2 {
    margin-top: 54px;
    font-size: 20px;
    font-weight: 400;
  }

  .book-document pre { font-size: 12px; }

  .book-interlude,
  .book-priest-colophon {
    margin-inline: -18px;
    padding-inline: 18px;
  }

  .book-apparatus { padding-left: 14px; }

  .book-pager {
    grid-template-columns: minmax(0, 1fr);
    gap: 30px;
  }

  .book-pager-next { text-align: left; }
}

/* P6 BOOKS DESIGN SYNC — shared shell tokens stay sourced from the main interface. */
.command {
  appearance: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  border: 0;
  background: transparent;
  color: inherit;
  padding: 0 12px;
  cursor: pointer;
  font: 500 9px/1 var(--mono);
  letter-spacing: .055em;
  text-decoration: none;
  white-space: nowrap;
}
.command:hover,
.command:focus-visible { background: var(--blue); color: var(--paper); outline: 0; }
.command.primary { min-height: 44px; padding: 0 16px; background: var(--ink); color: var(--paper); }
.command.primary:hover,
.command.primary:focus-visible { background: var(--blue); }
.command.small { min-height: 32px; padding: 0 8px; font-size: 8px; }

.books-mode-nav {
  position: sticky; z-index: 15; top: 64px;
  display: flex; min-width: 0; min-height: 42px;
  padding-left: 1rem; overflow-x: auto;
  border-bottom: 1px solid var(--line); background: rgba(239,239,234,.96);
  scroll-snap-type: x proximity; scrollbar-width: none;
}
.books-mode-nav::-webkit-scrollbar { display: none; }
.books-mode-nav a {
  flex: 0 0 auto; display: grid; grid-template-columns: 28px minmax(0,1fr); gap: 8px;
  align-items: center; min-width: 128px; min-height: 42px; padding: 6px 10px;
  border-right: 1px solid var(--faint); font: 500 10px/1 var(--mono);
  text-decoration: none; scroll-snap-align: start;
}
.books-mode-nav a small { font: 500 8px/1.15 var(--mono); white-space: normal; }
.books-mode-nav a:hover,
.books-mode-nav a:focus-visible { background: var(--faint); color: var(--ink); outline: 0; }
.books-mode-nav a:focus-visible { color: var(--blue); box-shadow: inset 0 0 0 1px var(--blue); }
.books-mode-nav a[aria-current="page"] { color: var(--blue); border-bottom: 1px solid var(--blue); }
.books-mode-nav > small { margin-left: auto; display: flex; align-items: center; padding: 0 1rem; font: 8px var(--mono); opacity: .65; white-space: nowrap; }

.books-mode-nav a[data-books-axis-route="index"],
.book-route-strip a[data-route-id="index"] {
  flex-basis: var(--books-route-cell-width);
  width: var(--books-route-cell-width);
  min-width: var(--books-route-cell-width);
  max-width: var(--books-route-cell-width);
  white-space: nowrap;
}

@media (min-width: 768px) {
  .books-nav .command {
    font-size: 12px;
    letter-spacing: .025em;
  }
}

@media (min-width: 768px) and (max-width: 900px) {
  .books-topbar {
    gap: 10px;
    padding-inline: 12px;
    overflow: hidden;
  }

  .books-brand-lockup {
    flex: 0 0 auto;
    min-width: 0;
    max-width: 310px;
  }

  .books-nav {
    flex: 1 1 auto;
    justify-content: flex-end;
    overflow: hidden;
  }

  .books-nav .command:first-child {
    margin-left: 0;
  }

  .books-nav .command:nth-child(2),
  .books-nav .command:nth-child(4) {
    display: none;
  }
}

@media(max-width:768px){
  .books-mode-nav { padding-left:0; }
  .books-mode-nav a { min-width:148px; scroll-snap-align:center; }
  .books-mode-nav > small { display:none; }
  .books-catalog .book-route-link { grid-template-columns:74px minmax(0,1fr) 112px; gap:12px; }
}
@media(max-width:430px){
  .books-index-main { padding:12px 10px 32px; overflow-x:hidden; }
  .books-catalog .book-route-link { grid-template-columns:62px minmax(0,1fr); min-height:88px; }
  .books-catalog .book-route-number { padding:0 8px; font-size:38px; }
  .books-catalog .book-route-copy { gap:7px; padding:10px 8px; }
  .books-catalog .book-route-title { font-size:18px; font-weight:400; }
  .books-catalog .book-route-state { grid-column:2; justify-content:flex-start; min-height:30px; padding:0 8px 8px; border-left:0; }
  .books-catalog .book-route-state strong { display:inline; }
}
@media(prefers-reduced-motion:reduce){
  html { scroll-behavior:auto; }
}

@media (max-width: 767px) {
  body.mobile-menu-open { overflow: hidden; }
  .books-topbar {
    z-index: 95;
    flex: 0 0 var(--global-header-height);
    width: 100%;
    height: var(--global-header-height);
    min-height: var(--global-header-height);
    max-height: var(--global-header-height);
    justify-content: space-between;
    padding-inline: var(--global-header-padding-x);
    overflow: visible;
  }
  .books-nav { display: none; }
  .books-brand-lockup {
    flex: 1 1 auto;
    min-width: 0;
    max-width: calc(100vw - 78px);
    height: var(--global-mobile-logo-size);
    overflow: visible;
  }
  .books-logo,
  .books-logo img {
    flex: 0 0 var(--global-mobile-logo-size);
    min-width: var(--global-mobile-logo-size);
    width: var(--global-mobile-logo-size);
    height: var(--global-mobile-logo-size);
    overflow: visible;
  }
  .books-logo:focus-visible { outline-offset: 3px; }
  .mobile-menu-toggle {
    display: inline-grid;
    flex: 0 0 var(--global-mobile-menu-size);
    width: var(--global-mobile-menu-size);
    min-width: var(--global-mobile-menu-size);
    min-height: var(--global-mobile-menu-size);
    place-items: center;
    gap: 4px;
    padding: 12px 8px;
    border: 0;
    background: transparent;
    color: var(--ink);
    cursor: pointer;
    touch-action: manipulation;
    font-family: var(--mono);
  }
  .mobile-menu-toggle span {
    display: block;
    width: 24px;
    height: 1px;
    background: currentColor;
    opacity: 1;
  }
  .mobile-menu-toggle:hover { color: var(--blue); }
  .mobile-menu-toggle:focus-visible {
    color: var(--blue);
    outline: 1px solid var(--blue);
    outline-offset: 3px;
  }
  .mobile-menu-backdrop:not([hidden]) {
    display: block;
    position: fixed;
    inset: 0;
    z-index: 94;
    background: rgba(5, 5, 5, .18);
  }
  .mobile-global-menu:not([hidden]) {
    display: block;
    position: fixed;
    z-index: 96;
    inset: var(--global-header-height) 0 auto;
    max-height: calc(100dvh - var(--global-header-height) - env(safe-area-inset-bottom));
    overflow-x: hidden;
    overflow-y: auto;
    border-top: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
    background: var(--paper);
  }
  .mobile-global-menu-inner { display: grid; min-width: 0; }
  .mobile-global-command {
    min-height: 48px;
    display: flex;
    align-items: center;
    width: 100%;
    padding: 0 var(--global-header-padding-x);
    border: 0;
    border-bottom: 1px solid var(--faint);
    background: transparent;
    color: var(--ink);
    text-align: left;
    text-decoration: none;
    cursor: pointer;
    font: 400 var(--global-nav-font-size)/1.2 var(--mono);
    letter-spacing: var(--global-nav-letter-spacing);
  }
  .mobile-global-command:hover { color: var(--blue); background: var(--faint); }
  .mobile-global-command:focus-visible {
    color: var(--blue);
    outline: 1px solid var(--blue);
    outline-offset: -2px;
  }
  .mobile-global-command-close { color: var(--blue); }
}


/* P7.2F.1b — BOOKS secondary navigation matches MAP category strip geometry. */
.books-mode-nav,
.book-route-strip {
  --books-route-cell-width: 64px;
  --books-route-group-width: 448px;
  position: sticky;
  z-index: 15;
  top: 64px;
  display: flex;
  align-items: stretch;
  min-width: 0;
  height: 34px;
  min-height: 34px;
  padding: 0;
  overflow-x: auto;
  overflow-y: hidden;
  border-bottom: 1px solid var(--line);
  background: rgba(239, 239, 234, 0.96);
  backdrop-filter: blur(12px);
  overscroll-behavior-inline: contain;
  scroll-behavior: smooth;
  scroll-snap-type: x proximity;
  scrollbar-width: none;
}

.books-mode-nav::-webkit-scrollbar,
.book-route-strip::-webkit-scrollbar { display: none; }

.book-route-strip::after {
  display: none;
  content: none;
}

.book-route-strip-group {
  display: flex;
  flex: 0 0 var(--books-route-group-width);
  width: var(--books-route-group-width);
  min-width: var(--books-route-group-width);
  max-width: var(--books-route-group-width);
  height: 34px;
  min-height: 34px;
  margin-inline: auto;
}

.books-mode-nav a,
.book-route-strip a {
  flex: 0 0 var(--books-route-cell-width);
  display: flex;
  align-items: center;
  justify-content: center;
  width: var(--books-route-cell-width);
  min-width: var(--books-route-cell-width);
  max-width: var(--books-route-cell-width);
  height: 34px;
  min-height: 34px;
  padding: 0;
  box-sizing: border-box;
  border-right: 1px solid var(--faint);
  border-bottom: 1px solid transparent;
  color: var(--ink);
  background: transparent;
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 400;
  line-height: 1;
  letter-spacing: .025em;
  text-decoration: none;
  text-align: center;
  white-space: nowrap;
  scroll-snap-align: start;
}

.books-mode-nav a:last-of-type,
.book-route-strip a:last-child { border-right: 0; }


.books-mode-nav a:hover,
.book-route-strip a:hover {
  background: var(--faint);
  color: var(--ink);
  outline: 0;
}

.books-mode-nav a:focus-visible,
.book-route-strip a:focus-visible {
  color: var(--blue);
  outline: 1px solid var(--blue);
  outline-offset: -2px;
  box-shadow: none;
}

.books-mode-nav a[aria-current="page"],
.book-route-strip a[aria-current="page"] {
  background: rgba(0, 60, 255, .14);
  color: var(--blue);
  border-bottom-color: rgba(0, 60, 255, .82);
  font-weight: 500;
}


.books-mode-nav > small {
  margin-left: auto;
  display: flex;
  align-items: center;
  min-height: 34px;
  padding: 0 1rem;
  color: var(--ink);
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 400;
  line-height: normal;
  letter-spacing: .025em;
  opacity: .65;
  white-space: nowrap;
}

@media (max-width: 767px) {
  .books-mode-nav,
  .book-route-strip {
    --books-route-cell-width: 44px;
    --books-route-group-width: 308px;
    height: 45px;
    min-height: 45px;
  }

  .books-mode-nav a,
  .book-route-strip a {
    height: 44px;
    min-height: 44px;
    font-size: 9px;
    letter-spacing: .05em;
    scroll-snap-align: center;
  }

  .book-route-strip-group {
    height: 44px;
    min-height: 44px;
  }

}

@media (max-width: 307px) {
  .book-route-strip-group {
    margin-inline: 0;
  }
}

/* P7.10 — approved three-level BOOKS chrome. */
.p710-global-row .books-nav { overflow: visible; }

.archive-section-nav {
  position: sticky;
  z-index: 18;
  top: 64px;
  display: flex;
  align-items: stretch;
  width: 100%;
  min-width: 0;
  height: 34px;
  padding: 0 1px 0 1rem;
  overflow-x: auto;
  overflow-y: hidden;
  border-bottom: 1px solid var(--line);
  background: rgba(239, 239, 234, 0.96);
  overscroll-behavior-inline: contain;
  scrollbar-width: none;
}

.archive-section-nav::-webkit-scrollbar { display: none; }

.archive-section-nav a {
  display: inline-flex;
  flex: 0 0 auto;
  align-items: center;
  min-height: 34px;
  padding: 0 .9rem;
  border-right: 1px solid var(--faint);
  color: var(--ink);
  background: transparent;
  font: 400 12px/1 var(--mono);
  letter-spacing: .025em;
  text-decoration: none;
  white-space: nowrap;
}

.archive-section-nav a:hover { color: var(--ink); background: var(--faint); }
.archive-section-nav a:focus-visible {
  color: var(--blue);
  outline: 1px solid var(--blue);
  outline-offset: -2px;
}
.archive-section-nav small { font: inherit; opacity: .65; }

.books-story-axis { top: 98px; }
.books-story-axis .book-route-strip-group {
  --books-route-group-width: 780px;
  flex-basis: var(--books-route-group-width);
  width: var(--books-route-group-width);
  min-width: var(--books-route-group-width);
  max-width: var(--books-route-group-width);
}
.books-story-axis a {
  flex: 1 1 130px;
  width: auto;
  min-width: 112px;
  max-width: none;
  font-size: 10px;
  letter-spacing: .045em;
}

@media (max-width: 767px) {
  .archive-section-nav,
  .books-story-axis { position: static; }
}

@media (max-width: 767px) {
  .books-topbar {
    overflow: hidden;
  }
  .books-topbar .books-brand-lockup {
    flex: 0 0 48px;
    min-width: 48px;
    max-width: 48px;
  }
  .books-topbar .books-logo,
  .books-topbar .books-logo img {
    flex-basis: 48px;
    min-width: 48px;
    width: 48px;
    height: 48px;
  }
  .books-topbar .books-nav {
    display: flex;
    flex: 1 1 auto;
    min-width: 0;
    overflow-x: auto;
    overflow-y: hidden;
  }
  .books-topbar .books-mobile-menu-toggle,
  .books-mobile-menu-backdrop,
  .books-mobile-global-menu {
    display: none !important;
  }
}

/* P7.2F.2 — BOOKS index catalogue and internal reader without identity rail. */
.books-index-main {
  padding: clamp(28px, 4vw, 56px) clamp(18px, 5vw, 76px) 72px;
  overflow-x: hidden;
}

.books-index-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
  margin: 0 0 24px;
}

.books-index-header h1 {
  margin: 0;
  color: var(--ink);
  font: 400 28px/1.15 var(--sans);
  letter-spacing: -.02em;
  text-transform: uppercase;
}

.books-index-progress {
  margin: 0 0 4px;
  color: var(--ink);
  font: 400 12px/1.25 var(--mono);
  letter-spacing: .04em;
  text-transform: uppercase;
  white-space: nowrap;
}

.books-index-progress[hidden],
.book-route-state[hidden] {
  display: none;
}

.books-catalog {
  margin: 0;
  border: 0;
  background: transparent;
}

.books-catalog .book-route-list {
  border-top: 1px solid var(--line);
  background: transparent;
}

.books-catalog .book-route-item {
  border-bottom: 1px solid var(--line);
  background: transparent;
}

.books-catalog .book-route-link {
  display: grid;
  grid-template-columns: 96px minmax(240px, 1fr) clamp(280px, 25vw, 340px) minmax(150px, 210px) 40px;
  gap: clamp(16px, 2.2vw, 28px);
  align-items: baseline;
  min-height: 104px;
  padding-block: 32px;
  background: transparent;
  color: var(--ink);
  text-decoration: none;
  box-sizing: border-box;
}

.books-catalog .book-route-link::before {
  display: none;
}

.books-catalog .book-route-number {
  align-self: baseline;
  display: block;
  padding: 0;
  border-right: 0;
  color: var(--ink);
  font: 400 28px/1 var(--mono);
  letter-spacing: 0;
}

.books-catalog .book-route-title {
  align-self: baseline;
  min-width: 0;
  color: var(--ink);
  font: 400 20px/1.2 var(--sans);
  letter-spacing: -.01em;
}

.books-catalog .book-route-meta {
  align-self: baseline;
  min-width: 0;
  color: var(--ink);
  font: 400 14px/1.35 var(--sans);
  letter-spacing: 0;
  text-transform: none;
  opacity: .82;
}

.books-catalog .book-route-state {
  align-self: baseline;
  display: block;
  min-width: 0;
  padding: 0;
  border-left: 0;
  color: var(--ink);
  font: 400 12px/1.2 var(--mono);
  letter-spacing: .035em;
  text-transform: uppercase;
  white-space: nowrap;
}

.books-catalog .book-route-arrow {
  align-self: baseline;
  justify-self: end;
  color: var(--ink);
  font: 400 12px/1 var(--mono);
  transition: transform 140ms ease;
}

.books-catalog .book-route-link:hover,
.books-catalog .book-route-link:focus-visible {
  background: rgba(0, 60, 255, .045);
  color: var(--ink);
  outline: 1px solid var(--blue);
  outline-offset: -1px;
}

.books-catalog .book-route-link:hover .book-route-number,
.books-catalog .book-route-link:hover .book-route-title,
.books-catalog .book-route-link:focus-visible .book-route-number,
.books-catalog .book-route-link:focus-visible .book-route-title,
.books-catalog .book-route-item[data-route-status="current"] .book-route-number,
.books-catalog .book-route-item[data-route-status="current"] .book-route-title {
  color: var(--blue);
  font-weight: 500;
}

.books-catalog .book-route-link:hover .book-route-state,
.books-catalog .book-route-link:focus-visible .book-route-state,
.books-catalog .book-route-item[data-route-status="current"] .book-route-state {
  color: var(--blue);
}

.books-catalog .book-route-link:hover .book-route-arrow,
.books-catalog .book-route-link:focus-visible .book-route-arrow {
  color: var(--blue);
  transform: translateX(4px);
}

.book-reader-layout {
  display: block;
  min-height: calc(100vh - 106px);
}

.book-reader-main {
  min-width: 0;
  padding: clamp(52px, 6vw, 92px) clamp(24px, 5vw, 78px) 110px;
}

.book-article {
  width: 100%;
  max-width: 1180px;
  margin-inline: auto;
}

.book-reader-meta-line {
  margin: 0;
  color: var(--blue);
  font: 400 11px/1.35 var(--mono);
  letter-spacing: .055em;
  text-transform: uppercase;
}

@media (max-width: 767px) {
  .books-index-main {
    padding: 24px 14px 56px;
  }

  .books-index-header {
    display: block;
    margin-bottom: 18px;
  }

  .books-index-progress {
    margin-top: 10px;
    font-size: 10px;
    white-space: normal;
  }

  .books-catalog .book-route-link {
    grid-template-columns: 56px minmax(0, 1fr) 24px;
    grid-template-areas:
      "code title arrow"
      "code meta arrow"
      "code state arrow";
    align-items: baseline;
    gap: 6px 12px;
    min-height: 96px;
    padding: 12px 0;
    background: transparent;
  }

  .books-catalog .book-route-number {
    grid-area: code;
    align-self: baseline;
    font-size: 22px;
  }

  .books-catalog .book-route-title {
    grid-area: title;
    align-self: baseline;
    font-size: 18px;
    line-height: 1.2;
  }

  .books-catalog .book-route-meta {
    grid-area: meta;
    align-self: start;
    font-size: 13px;
    line-height: 1.35;
  }

  .books-catalog .book-route-state {
    grid-area: state;
    align-self: start;
    justify-self: stretch;
    width: 100%;
    min-height: 0;
    font-size: 10px;
    white-space: nowrap;
  }

  .books-catalog .book-route-arrow {
    grid-area: arrow;
    align-self: baseline;
    font-size: 12px;
  }

  .book-reader-main {
    padding: 42px 18px 76px;
  }

  .book-reader-meta-line {
    font-size: 10px;
  }
}

@media print { .books-mode-nav,.books-tracebar { display:none; } }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; }
}

@media print {
  html,
  body { background: #fff; }

  .books-topbar,
  .book-route-strip,
  .book-rubricator,
  .book-pager { display: none !important; }

  .book-reader-layout,
  .book-reading-grid { display: block; }
  .books-index-main,
  .book-reader-main { padding: 0; }
  .book-article { max-width: none; }
}

/* Compact page navigation for narrow screens. The desktop rubricator remains a sticky rail. */
.book-mobile-navigation { display: none; }

.book-apparatus-label {
  display: block;
  margin-bottom: 15px;
  color: var(--blue);
  font: 500 9px/1.3 var(--mono);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

@media (max-width: 900px) {
  .book-rubricator { display: none; }

  .book-mobile-navigation {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 0 28px;
    margin: 0 0 54px;
    border-block: 1px solid var(--line);
  }

  .book-mobile-nav-group { min-width: 0; }

  .book-mobile-nav-group summary {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 12px;
    align-items: center;
    min-height: 46px;
    cursor: pointer;
    list-style: none;
    color: var(--ink);
    font: 500 8px/1.2 var(--mono);
    letter-spacing: 0.09em;
  }

  .book-mobile-nav-group summary::-webkit-details-marker { display: none; }
  .book-mobile-nav-group summary small { color: var(--blue); font: inherit; }
  .book-mobile-nav-group summary::after { content: "+"; color: var(--blue); }
  .book-mobile-nav-group[open] summary::after { content: "−"; }
  .book-mobile-nav-group summary small { justify-self: end; }

  .book-mobile-nav-group .book-section-nav,
  .book-mobile-nav-group .book-concept-nav {
    margin: 0 0 18px;
    border-top: 1px solid var(--faint);
  }
}

@media (max-width: 620px) {
  .book-mobile-navigation {
    grid-template-columns: 1fr;
    gap: 0;
    margin-bottom: 46px;
  }

  .book-mobile-nav-group + .book-mobile-nav-group { border-top: 1px solid var(--faint); }
}

@media (max-width: 900px) {
  .book-mobile-nav-group summary { grid-template-columns: minmax(0, 1fr) auto auto; }
}

@media (max-width: 620px) {
  .book-document > h2:first-child { margin-top: 20px; }
}

.book-body-anchor {
  display: block;
  width: 0;
  height: 0;
  scroll-margin-top: 136px;
}

/* P7.2B — compact SEARCH palette inside BOOKS without route change. */
body.books-search-open {
  overflow: hidden;
}

body.books-search-open .books-nav .command[aria-current="page"]:not(.books-search-active) {
  color: inherit;
  border-bottom-color: transparent;
}

.books-search-dialog.search-palette {
  position: fixed;
  top: clamp(72px, 12vh, 140px);
  left: 50%;
  transform: translateX(-50%);
  width: clamp(560px, 54vw, 720px);
  max-width: calc(100vw - 32px);
  max-height: 65vh;
  margin: 0;
  padding: 0;
  overflow: hidden;
  background: #f1f0eb;
  color: #4a433d;
  border: 1px solid rgba(54, 49, 44, .32);
  box-shadow: 0 12px 40px rgba(0, 0, 0, .10);
}

.books-search-dialog.search-palette::backdrop {
  background: rgba(8, 11, 15, .20);
  backdrop-filter: blur(3px);
}

.books-search-dialog .search-palette__panel {
  display: grid;
  grid-template-rows: auto auto minmax(0, auto) auto;
  max-height: 65vh;
  min-height: 0;
  overflow: hidden;
  background: #f1f0eb;
}

.books-search-dialog .search-palette__header {
  min-height: 44px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 0 18px 0 22px;
  border-bottom: 1px solid rgba(54, 49, 44, .18);
}

.books-search-dialog .search-palette__header h2 {
  margin: 0;
  color: #4a433d;
  font: 500 10px/1 var(--mono);
  letter-spacing: .06em;
}

.books-search-dialog .search-palette__close,
.books-search-dialog .search-palette__clear {
  border: 0;
  background: transparent;
  color: rgba(74, 67, 61, .72);
  cursor: pointer;
  font: 500 10px/1 var(--mono);
  letter-spacing: .06em;
}

.books-search-dialog .search-palette__close {
  min-width: 44px;
  min-height: 44px;
}

.books-search-dialog .search-palette__close:hover,
.books-search-dialog .search-palette__clear:hover,
.books-search-dialog .search-palette__close:focus-visible,
.books-search-dialog .search-palette__clear:focus-visible {
  color: var(--blue);
}

.books-search-dialog .search-palette__close:focus-visible,
.books-search-dialog .search-palette__clear:focus-visible {
  outline: 1px solid var(--blue);
  outline-offset: -2px;
}

.books-search-dialog .search-palette__input-wrap {
  position: relative;
  display: grid;
  gap: 6px;
  padding: 0 22px 8px;
  border-bottom: 1px solid rgba(54, 49, 44, .18);
}

.books-search-dialog .search-palette__input {
  width: 100%;
  min-height: 58px;
  padding: 0 42px 0 0;
  border: 0;
  border-bottom: 1px solid rgba(74, 67, 61, .28);
  background: transparent;
  color: #4a433d;
  outline: none;
  font: 400 24px/1.18 var(--sans);
}

.books-search-dialog .search-palette__input::placeholder {
  color: rgba(74, 67, 61, .58);
}

.books-search-dialog .search-palette__input:focus {
  border-bottom-color: var(--blue);
  box-shadow: inset 0 -1px 0 var(--blue);
}

.books-search-dialog .search-palette__clear {
  position: absolute;
  z-index: 2;
  right: 20px;
  top: 13px;
  width: 44px;
  height: 44px;
  font-size: 18px;
  letter-spacing: 0;
}

.books-search-dialog .search-palette__hint {
  margin: 0;
  color: rgba(74, 67, 61, .52);
  font: 500 10px/1.25 var(--mono);
  letter-spacing: .035em;
}

.books-search-dialog .search-palette__hint[hidden] {
  display: none !important;
}

.books-search-dialog .search-palette__content {
  min-height: 0;
  max-height: min(42vh, 360px);
  overflow: hidden;
}

.books-search-dialog[data-search-state="initial"] .search-palette__content { max-height: 214px; }
.books-search-dialog[data-search-state="empty"] .search-palette__content { max-height: 142px; }

.books-search-dialog .search-palette__section-label {
  padding: 10px 22px 6px;
  color: rgba(74, 67, 61, .62);
  font: 500 10px/1 var(--mono);
  letter-spacing: .065em;
}

.books-search-dialog .search-results.search-palette__results {
  min-height: 0;
  max-height: calc(65vh - 188px);
  overflow-x: hidden;
  overflow-y: auto;
  background: #f1f0eb;
  scrollbar-width: thin;
  scrollbar-color: rgba(74, 67, 61, .26) transparent;
}

.books-search-dialog[data-search-state="initial"] .search-results.search-palette__results,
.books-search-dialog[data-search-state="empty"] .search-results.search-palette__results {
  overflow: hidden;
}

.books-search-dialog .search-result {
  position: relative;
  min-height: 48px;
  max-height: 58px;
  width: 100%;
  padding: 10px 24px 10px 22px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  column-gap: 24px;
  border: 0;
  border-bottom: 1px solid rgba(54, 49, 44, .11);
  background: transparent;
  color: #4a433d;
  text-align: left;
  cursor: pointer;
  user-select: none;
}

.books-search-dialog .search-result::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 3px;
  background: transparent;
}

.books-search-dialog .search-result__title {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  color: #4a433d;
  font-family: var(--sans);
  font-size: 15.5px;
  font-weight: 400;
  line-height: 1.18;
}

.books-search-dialog .search-result__meta {
  color: rgba(74, 67, 61, .58);
  white-space: nowrap;
  font: 500 10px/1.1 var(--mono);
  letter-spacing: .045em;
}

.books-search-dialog .search-result:hover,
.books-search-dialog .search-result[aria-selected="true"],
.books-search-dialog .search-result:focus-visible {
  background: rgba(0, 60, 255, .06);
  outline: none;
}

.books-search-dialog .search-result:hover::before,
.books-search-dialog .search-result[aria-selected="true"]::before,
.books-search-dialog .search-result:focus-visible::before {
  background: var(--blue);
}

.books-search-dialog .search-empty {
  min-height: 96px;
  padding: 14px 22px 20px;
  display: grid;
  align-content: start;
  gap: 8px;
  color: #4a433d;
}

.books-search-dialog .search-empty b {
  font: 500 12px/1 var(--mono);
  letter-spacing: .06em;
}

.books-search-dialog .search-empty span {
  color: rgba(74, 67, 61, .62);
  font: 400 13px/1.35 var(--sans);
}

.books-search-dialog .search-palette__footer {
  min-height: 34px;
  display: flex;
  align-items: center;
  padding: 0 22px;
  border-top: 1px solid rgba(54, 49, 44, .18);
  color: rgba(74, 67, 61, .58);
  font: 500 10px/1 var(--mono);
  letter-spacing: .055em;
}

.books-nav .command.books-search-active,
.books-nav .command.books-search-active:hover,
.books-nav .command.books-search-active:focus-visible {
  color: var(--blue);
  border-bottom: 1px solid var(--blue);
}

@media (max-width: 767px) {
  .books-search-dialog.search-palette {
    top: max(72px, calc(64px + env(safe-area-inset-top) + 8px));
    left: 14px;
    right: 14px;
    width: auto;
    max-width: none;
    transform: none;
    max-height: calc(100dvh - 100px - env(safe-area-inset-bottom));
  }

  .books-search-dialog .search-palette__panel {
    max-height: calc(100dvh - 100px - env(safe-area-inset-bottom));
  }

  .books-search-dialog .search-palette__header { padding-inline: 16px 12px; }
  .books-search-dialog .search-palette__input-wrap { padding-inline: 16px; }
  .books-search-dialog .search-palette__input { min-height: 56px; font-size: 19px; }
  .books-search-dialog .search-palette__section-label,
  .books-search-dialog .search-palette__footer { padding-inline: 16px; }
  .books-search-dialog .search-results.search-palette__results { max-height: calc(100dvh - 290px - env(safe-area-inset-bottom)); }
  .books-search-dialog .search-result { min-height: 56px; max-height: none; padding-inline: 16px; grid-template-columns: minmax(0, 1fr); row-gap: 4px; }
  .books-search-dialog .search-result__title { font-size: 15px; }
  .books-search-dialog .search-result__meta { font-size: 9.5px; }
}

/* P7.12D — final cascade application of the strict semantic type contract. */
.books-nav .command,.archive-section-nav a,.book-route-strip a,.books-mode-nav a{font-family:var(--mono);font-size:var(--type-meta-size);line-height:var(--type-meta-line);letter-spacing:var(--type-nav-tracking)}
.books-index-header h1,.book-reader-title{font:var(--type-title-weight) var(--type-title-size)/var(--type-title-line) var(--sans);letter-spacing:var(--type-display-tracking)}
.book-route-number{font:var(--type-title-weight) var(--type-section-size)/1 var(--mono)}
.book-route-title{font:var(--type-subhead-weight) var(--type-subhead-size)/var(--type-subhead-line) var(--sans);letter-spacing:var(--type-subhead-tracking)}
.book-route-meta,.book-related-description{font:var(--type-body-weight) var(--type-small-size)/var(--type-small-line) var(--sans)}
.book-reader-meta-line,.book-route-meta-line,.book-section-label,.book-section-nav a,.book-concept-link,.book-pager-direction,.book-related-label,.tracebar{font-family:var(--mono);font-size:var(--type-meta-size);line-height:var(--type-meta-line);letter-spacing:var(--type-system-tracking)}
.book-reader-lead{font:300 var(--type-lead-size)/var(--type-lead-line) var(--sans);letter-spacing:var(--type-section-tracking)}
.book-document{font:var(--type-body-weight) var(--type-body-size)/var(--type-body-line) var(--sans)}
.book-document p,.book-document li{font-size:var(--type-body-size);line-height:var(--type-body-line)}
.book-document h2{font:var(--type-section-weight) var(--type-section-size)/var(--type-section-line) var(--sans);letter-spacing:var(--type-section-tracking)}
.book-document h3{font:var(--type-subhead-weight) var(--type-subhead-size)/var(--type-subhead-line) var(--sans);letter-spacing:var(--type-subhead-tracking)}
.book-document h4{font:var(--type-system-weight) var(--type-meta-size)/var(--type-meta-line) var(--mono);letter-spacing:var(--type-system-tracking)}
.book-document code,.book-document pre,.book-apparatus{font-family:var(--mono);font-size:var(--type-small-size);line-height:var(--type-small-line)}
.book-interlude,.book-priest-colophon{font-family:var(--mono);font-size:var(--type-body-size);line-height:var(--type-body-line)}
.book-interlude p,.book-interlude li,.book-priest-colophon p,.book-priest-colophon li{font-size:inherit;line-height:inherit}
.book-pager-title{font:var(--type-section-weight) var(--type-section-size)/var(--type-section-line) var(--sans);letter-spacing:var(--type-section-tracking)}
.books-search-dialog .search-palette__header h2,.books-search-dialog .search-palette__hint,.books-search-dialog .search-palette__section-label,.books-search-dialog .search-result__meta,.books-search-dialog .search-palette__footer{font-family:var(--mono);font-size:var(--type-meta-size);line-height:var(--type-meta-line);font-weight:var(--type-system-weight);letter-spacing:var(--type-system-tracking)}
.books-search-dialog .search-palette__input{font:var(--type-body-weight) var(--type-search-display-size)/1.18 var(--sans)}
.books-search-dialog .search-result__title,.books-search-dialog .search-empty span{font:var(--type-body-weight) var(--type-small-size)/var(--type-small-line) var(--sans)}

/* P7.12D.3 — approved final BOOKS typography corrections. */
.books-catalog .book-route-number {
  font: 400 22px/1 var(--mono);
}
.books-catalog .book-route-title {
  font-weight: var(--type-subhead-weight);
}
.books-catalog .book-route-link:hover .book-route-number,
.books-catalog .book-route-link:focus-visible .book-route-number,
.books-catalog .book-route-item[data-route-status="current"] .book-route-number {
  font-weight: 400;
}
.books-catalog .book-route-state,
.books-catalog .book-route-state strong {
  font: var(--type-system-weight) var(--type-meta-size)/var(--type-meta-line) var(--mono);
}
@media (max-width: 767px) {
  .books-reader-page .book-reader-lead {
    font: 300 var(--type-lead-size)/var(--type-lead-line) var(--sans);
  }
  .books-reader-page .book-document,
  .books-reader-page .book-document p,
  .books-reader-page .book-document li {
    font: var(--type-body-weight) var(--type-body-size)/var(--type-body-line) var(--sans);
  }
  .books-reader-page .book-document h2 {
    font: var(--type-section-weight) var(--type-section-size)/var(--type-section-line) var(--sans);
    letter-spacing: var(--type-section-tracking);
  }
}

/* P7.12E — final color cascade. */
.book-interlude,.books-dark-interlude{background:var(--color-black);color:var(--color-white)}
.books-search-dialog.search-palette,.books-search-dialog .search-palette__panel,.books-search-dialog .search-palette__content,.books-search-dialog .search-results.search-palette__results{background:var(--surface-light);color:var(--color-warm-ink)}
.books-search-dialog .search-palette__header h2,.books-search-dialog .search-palette__input,.books-search-dialog .search-result,.books-search-dialog .search-result__title,.books-search-dialog .search-empty{color:var(--color-warm-ink)}
.books-search-dialog .search-palette__close,.books-search-dialog .search-palette__clear{color:rgba(107,94,87,.72)}
.books-search-dialog .search-palette__input::placeholder,.books-search-dialog .search-result__meta,.books-search-dialog .search-palette__footer{color:rgba(107,94,87,.58)}
.books-search-dialog .search-palette__hint{color:rgba(107,94,87,.52)}
.books-search-dialog .search-palette__section-label,.books-search-dialog .search-empty span{color:rgba(107,94,87,.62)}