:root {
  --nt-black: #0f1115;
  --nt-charcoal: #15191f;
  --nt-charcoal-soft: #1b2027;
  --nt-surface: #222831;
  --nt-mist: #e9edf2;
  --nt-mist-soft: #c8d0d8;
  --nt-white: #f7f9fb;
  --nt-blue: #86a9c9;
  --nt-blue-deep: #253f63;
  --nt-line: rgba(233, 237, 242, 0.14);
  --nt-line-strong: rgba(233, 237, 242, 0.24);
  --nt-ink: #10141a;
  --nt-ink-muted: #4c5865;
  --nt-font-sans: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --nt-font-serif: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, serif;
  --nt-shell: 1180px;
  --nt-reading: 710px;
  --nt-radius: 8px;
}

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

html {
  color-scheme: dark;
  scroll-behavior: smooth;
  scroll-padding-top: 6rem;
  background: var(--nt-black);
}

body {
  margin: 0;
  min-width: 320px;
  color: var(--nt-white);
  font-family: var(--nt-font-sans);
  background: var(--nt-black);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

body::before {
  position: fixed;
  inset: 0 auto 0 50%;
  width: 1px;
  background: rgba(233, 237, 242, 0.025);
  content: "";
  pointer-events: none;
}

::selection {
  color: var(--nt-black);
  background: var(--nt-blue);
}

a {
  color: inherit;
  text-decoration: none;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

button {
  color: inherit;
  font: inherit;
}

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

h1,
h2,
h3,
h4,
p,
dl,
dd,
blockquote {
  margin: 0;
}

ul,
ol {
  margin: 0;
}

.site-shell {
  width: min(calc(100% - 48px), var(--nt-shell));
  margin-inline: auto;
}

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 100;
  padding: 10px 14px;
  color: var(--nt-black);
  font-size: 0.78rem;
  font-weight: 800;
  background: var(--nt-white);
  border-radius: 4px;
  transform: translateY(-160%);
}

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

:focus-visible {
  outline: 2px solid var(--nt-blue);
  outline-offset: 4px;
}

.site-header {
  position: relative;
  z-index: 10;
  border-bottom: 1px solid var(--nt-line);
  background: rgba(15, 17, 21, 0.96);
}

.header-inner {
  min-height: 96px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  white-space: nowrap;
}

.brand-logo {
  width: 142px;
  height: auto;
  filter: invert(1) brightness(1.22);
}

.brand-series {
  color: var(--nt-mist-soft);
  font-size: 0.68rem;
  font-weight: 750;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.site-nav {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: clamp(22px, 2.8vw, 48px);
}

.site-nav a {
  padding-block: 10px;
  color: var(--nt-mist-soft);
  font-size: 0.65rem;
  font-weight: 720;
  letter-spacing: 0.11em;
  text-transform: uppercase;
  border-bottom: 1px solid transparent;
  transition: color 140ms ease, border-color 140ms ease;
}

.site-nav a:hover {
  color: var(--nt-white);
  border-color: var(--nt-blue);
}

.hero {
  min-height: 720px;
  padding-block: clamp(88px, 8vw, 112px);
  display: grid;
  grid-template-columns: minmax(0, 1.55fr) minmax(290px, 0.7fr);
  gap: clamp(58px, 8vw, 110px);
  align-items: center;
}

.eyebrow,
.section-index,
.publication-series,
.publication-volume,
.publication-type,
.archive-mark-heading,
.future-code,
.status-tag,
.reader-kicker,
.reader-meta,
.reader-toc-title {
  font-size: 0.69rem;
  font-weight: 780;
  letter-spacing: 0.18em;
  line-height: 1.4;
  text-transform: uppercase;
}

.eyebrow,
.section-index {
  font-size: 0.61rem;
  font-weight: 760;
  letter-spacing: 0.22em;
  line-height: 1.2;
}

.eyebrow,
.section-index,
.publication-series,
.reader-kicker {
  color: var(--nt-blue);
}

.hero h1 {
  max-width: 10ch;
  margin-top: 24px;
  font-size: clamp(4rem, 7.2vw, 6.7rem);
  font-weight: 780;
  letter-spacing: -0.06em;
  line-height: 0.91;
  text-wrap: balance;
}

.hero-subtitle {
  max-width: 760px;
  margin-top: 32px;
  color: var(--nt-white);
  font-size: clamp(1.28rem, 2.1vw, 1.72rem);
  font-weight: 480;
  line-height: 1.38;
  text-wrap: balance;
}

.hero-introduction {
  max-width: 710px;
  margin-top: 30px;
  color: var(--nt-mist-soft);
  font-size: 1rem;
  line-height: 1.78;
}

.release-banner {
  max-width: 710px;
  margin-top: 30px;
  padding: 18px 0;
  display: grid;
  grid-template-columns: 122px minmax(0, 1fr) auto;
  gap: 18px;
  align-items: center;
  color: var(--nt-white);
  border-top: 1px solid var(--nt-blue);
  border-bottom: 1px solid var(--nt-line-strong);
  transition: border-color 140ms ease, color 140ms ease;
}

.release-banner:hover {
  color: var(--nt-blue);
  border-bottom-color: var(--nt-blue);
}

.release-banner-label,
.release-banner time {
  color: var(--nt-blue);
  font-size: 0.62rem;
  font-weight: 780;
  letter-spacing: 0.14em;
  line-height: 1.45;
  text-transform: uppercase;
}

.release-banner strong {
  font-size: 0.82rem;
  line-height: 1.45;
}

.release-banner time {
  color: var(--nt-mist-soft);
  white-space: nowrap;
}

.hero-actions,
.publication-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  margin-top: 32px;
}

.button,
.copy-button {
  min-height: 51px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.9rem 1.3rem;
  border: 1px solid transparent;
  border-radius: 0;
  font-size: 0.66rem;
  font-weight: 740;
  letter-spacing: 0.11em;
  line-height: 1;
  text-transform: uppercase;
  cursor: pointer;
  transition: background-color 140ms ease, border-color 140ms ease, color 140ms ease;
}

.button + .button {
  margin-left: -1px;
}

.button-primary {
  color: var(--nt-black);
  background: var(--nt-white);
}

.button-primary:hover {
  background: var(--nt-blue);
}

.button-secondary {
  color: var(--nt-white);
  border-color: var(--nt-line-strong);
  background: transparent;
}

.button-secondary:hover {
  border-color: var(--nt-blue);
}

.button-dark {
  color: var(--nt-white);
  background: var(--nt-black);
}

.button-dark:hover {
  background: var(--nt-blue-deep);
}

.button-outline-dark {
  color: var(--nt-ink);
  border-color: rgba(15, 17, 21, 0.3);
  background: transparent;
}

.button-outline-dark:hover {
  color: var(--nt-white);
  background: var(--nt-black);
}

.archive-mark {
  align-self: end;
  border-top: 1px solid var(--nt-blue);
  border-bottom: 1px solid var(--nt-line);
}

.archive-mark-heading {
  min-height: 54px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--nt-blue);
  border-bottom: 1px solid var(--nt-line);
}

.archive-mark dl > div {
  padding: 15px 0;
  display: grid;
  grid-template-columns: 0.9fr 1.3fr;
  gap: 20px;
  border-bottom: 1px solid var(--nt-line);
}

.archive-mark dt,
.publication-meta dt {
  color: #8f9aa5;
  font-size: 0.63rem;
  font-weight: 760;
  letter-spacing: 0.11em;
  line-height: 1.45;
  text-transform: uppercase;
}

.archive-mark dd {
  color: var(--nt-mist);
  font-size: 0.79rem;
  line-height: 1.45;
}

.archive-mark-note {
  padding: 18px 0 2px;
  color: #89939d;
  font-family: var(--nt-font-serif);
  font-size: 0.86rem;
  font-style: italic;
  line-height: 1.55;
}

.rule-section {
  border-top: 1px solid var(--nt-line);
  border-bottom: 1px solid var(--nt-line);
  background: var(--nt-charcoal);
}

.statement-grid,
.citation-grid,
.revision-grid {
  padding-block: clamp(72px, 8vw, 112px);
  display: grid;
  grid-template-columns: minmax(260px, 0.72fr) minmax(0, 1.28fr);
  gap: clamp(54px, 9vw, 130px);
}

.statement-grid h2,
.citation-grid h2,
.revision-grid h2,
.section-heading h2 {
  margin-top: 18px;
  font-size: clamp(2.4rem, 3.6vw, 3.7rem);
  font-weight: 750;
  letter-spacing: -0.045em;
  line-height: 0.98;
  text-wrap: balance;
}

.statement-copy {
  display: grid;
  gap: 22px;
}

.statement-copy p {
  color: var(--nt-mist-soft);
  font-family: var(--nt-font-serif);
  font-size: clamp(1.28rem, 2vw, 1.62rem);
  line-height: 1.5;
}

.statement-copy p:nth-child(2) {
  color: var(--nt-white);
  font-size: clamp(1.62rem, 2.8vw, 2.35rem);
  line-height: 1.28;
}

.publications-section,
.future-section {
  padding-block: clamp(88px, 8vw, 128px);
}

.section-heading {
  max-width: 760px;
  margin-bottom: 48px;
}

.section-heading > p:last-child,
.section-note {
  max-width: 650px;
  margin-top: 22px;
  color: var(--nt-mist-soft);
  font-size: 0.97rem;
  line-height: 1.82;
}

.publication-card {
  position: relative;
  min-height: 590px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 230px;
  gap: 60px;
  padding: clamp(34px, 5.8vw, 72px);
  color: var(--nt-ink);
  background: var(--nt-mist);
  border-radius: var(--nt-radius);
  overflow: hidden;
}

.publication-card + .publication-card {
  margin-top: 28px;
}

.publication-method {
  min-height: 500px;
  background: #dfe7ee;
}

.publication-volume-two {
  min-height: 650px;
  background: #edf3f7;
  border-top: 4px solid var(--nt-blue);
}

.publication-volume-two .publication-volume {
  color: var(--nt-blue-deep);
}

.publication-volume-two .publication-main h3 {
  max-width: 14ch;
  font-size: clamp(2.7rem, 5.5vw, 5.45rem);
}

.publication-number {
  position: absolute;
  top: 28px;
  right: 38px;
  color: rgba(15, 17, 21, 0.08);
  font-family: var(--nt-font-serif);
  font-size: clamp(8rem, 22vw, 17rem);
  line-height: 0.75;
  pointer-events: none;
}

.publication-method .publication-number {
  font-size: clamp(6rem, 15vw, 12rem);
}

.publication-main,
.publication-meta {
  position: relative;
  z-index: 1;
}

.publication-series {
  color: var(--nt-blue-deep);
}

.publication-volume {
  margin-top: 18px;
  color: #5c6874;
}

.publication-main h3 {
  max-width: 13ch;
  margin-top: 18px;
  font-size: clamp(2.8rem, 6.3vw, 6rem);
  font-weight: 750;
  letter-spacing: -0.058em;
  line-height: 0.93;
  text-wrap: balance;
}

.publication-method .publication-main h3 {
  max-width: 16ch;
  font-size: clamp(2.45rem, 5vw, 4.9rem);
}

.publication-type {
  margin-top: 24px;
  color: #5c6874;
}

.publication-description {
  max-width: 720px;
  margin-top: 32px;
  color: var(--nt-ink-muted);
  font-family: var(--nt-font-serif);
  font-size: 1.08rem;
  line-height: 1.72;
}

.publication-meta {
  align-self: end;
  border-top: 1px solid rgba(15, 17, 21, 0.22);
}

.publication-meta > div {
  padding: 14px 0;
  border-bottom: 1px solid rgba(15, 17, 21, 0.13);
}

.publication-meta dt {
  color: #5c6874;
}

.publication-meta dd {
  margin-top: 5px;
  color: var(--nt-ink);
  font-size: 0.78rem;
  line-height: 1.45;
}

.publication-meta-note {
  display: block;
  margin-top: 4px;
  color: #5c6874;
  font-size: 0.68rem;
  font-weight: 760;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.publication-schedule {
  max-width: 510px;
  margin-top: 32px;
  padding-top: 20px;
  border-top: 1px solid rgba(15, 17, 21, 0.22);
}

.publication-schedule > span {
  display: block;
  color: #5c6874;
  font-size: 0.63rem;
  font-weight: 780;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

.publication-schedule time {
  display: block;
  margin-top: 7px;
  color: var(--nt-ink);
  font-size: 1.15rem;
  font-weight: 760;
}

.publication-schedule p {
  margin-top: 8px;
  color: var(--nt-ink-muted);
  font-family: var(--nt-font-serif);
  font-size: 0.95rem;
  line-height: 1.55;
}

.citation-record {
  min-width: 0;
  padding-top: 7px;
}

.citation-record + .citation-record {
  margin-top: 34px;
  padding-top: 30px;
  border-top: 1px solid var(--nt-line);
}

.citation-record > p {
  max-width: 780px;
  color: var(--nt-white);
  font-family: var(--nt-font-serif);
  font-size: clamp(1.3rem, 2.2vw, 1.72rem);
  line-height: 1.58;
}

.copy-button {
  margin-top: 30px;
  color: var(--nt-white);
  border-color: var(--nt-line-strong);
  background: transparent;
}

.copy-button:hover {
  border-color: var(--nt-blue);
  background: var(--nt-charcoal-soft);
}

.copy-status {
  margin-left: 14px;
  color: var(--nt-blue);
  font-size: 0.75rem;
}

.future-ledger {
  border-top: 1px solid var(--nt-line-strong);
}

.future-ledger-title {
  margin: 64px 0 18px;
  color: var(--nt-blue);
  font-size: 0.62rem;
  font-weight: 780;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.future-record {
  min-height: 112px;
  display: grid;
  grid-template-columns: 140px minmax(0, 1fr) auto;
  gap: 34px;
  align-items: center;
  padding: 24px 0;
  border-bottom: 1px solid var(--nt-line);
}

.future-code {
  color: var(--nt-blue);
}

.future-record h3 {
  font-size: clamp(1.25rem, 2.3vw, 1.78rem);
  font-weight: 620;
  letter-spacing: -0.025em;
  line-height: 1.25;
}

.status-tag {
  min-width: 116px;
  padding: 8px 10px;
  color: #a4adb6;
  text-align: center;
  border: 1px solid var(--nt-line);
  border-radius: 999px;
}

.revision-statement > p {
  max-width: 720px;
  color: var(--nt-white);
  font-family: var(--nt-font-serif);
  font-size: clamp(1.3rem, 2.2vw, 1.72rem);
  line-height: 1.58;
}

.revision-statement ul {
  max-width: 720px;
  margin-top: 34px;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--nt-line);
}

.revision-statement li {
  padding: 17px 0 17px 30px;
  color: var(--nt-mist-soft);
  line-height: 1.55;
  border-bottom: 1px solid var(--nt-line);
}

.revision-statement li::before {
  float: left;
  margin-left: -30px;
  color: var(--nt-blue);
  content: "—";
}

.site-footer {
  padding-block: 52px;
  border-top: 1px solid var(--nt-line);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr auto;
  gap: 28px 52px;
  align-items: start;
}

.footer-series {
  display: block;
}

.footer-logo {
  width: 132px;
  height: auto;
  filter: invert(1) brightness(1.22);
}

.footer-series {
  margin-top: 8px;
  color: #8d98a2;
  font-size: 0.64rem;
  font-weight: 750;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.footer-grid > p {
  color: #aab3bc;
  font-family: var(--nt-font-serif);
  font-size: 0.9rem;
  line-height: 1.6;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 18px;
}

.footer-links a {
  color: var(--nt-mist-soft);
  font-size: 0.66rem;
  font-weight: 750;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.footer-links a:hover {
  color: var(--nt-blue);
}

.copyright {
  grid-column: 2 / -1;
  padding-top: 20px;
  border-top: 1px solid var(--nt-line);
}

/* Volume reader */
.reader-body {
  background: #12151a;
}

.reader-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid var(--nt-line);
  background: rgba(15, 17, 21, 0.97);
}

.reader-header-inner {
  min-height: 70px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.reader-back,
.reader-download {
  color: var(--nt-mist-soft);
  font-size: 0.67rem;
  font-weight: 760;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.reader-back:hover,
.reader-download:hover {
  color: var(--nt-white);
}

.reader-back::before {
  margin-right: 8px;
  color: var(--nt-blue);
  content: "←";
}

.reader-masthead {
  padding-block: clamp(76px, 9vw, 122px);
  border-bottom: 1px solid var(--nt-line);
  background: var(--nt-black);
}

.reader-masthead-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 240px;
  gap: 72px;
  align-items: end;
}

.reader-masthead h1 {
  max-width: 13ch;
  margin-top: 22px;
  font-size: clamp(3.2rem, 7vw, 6.7rem);
  font-weight: 760;
  letter-spacing: -0.06em;
  line-height: 0.92;
  text-wrap: balance;
}

.reader-deck {
  max-width: 700px;
  margin-top: 28px;
  color: var(--nt-mist-soft);
  font-family: var(--nt-font-serif);
  font-size: clamp(1.18rem, 2vw, 1.5rem);
  line-height: 1.52;
}

.reader-meta {
  color: #96a0aa;
  border-top: 1px solid var(--nt-blue);
}

.reader-meta span {
  display: block;
  padding: 12px 0;
  border-bottom: 1px solid var(--nt-line);
}

.mobile-toc {
  display: none;
}

.reader-layout {
  width: min(calc(100% - 48px), 1240px);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 260px minmax(0, var(--nt-reading));
  gap: clamp(64px, 9vw, 132px);
  justify-content: center;
  align-items: start;
  padding-block: 74px 130px;
}

.reader-toc {
  position: sticky;
  top: 102px;
  max-height: calc(100vh - 130px);
  overflow-y: auto;
  padding-right: 18px;
  scrollbar-color: #4f5963 transparent;
  scrollbar-width: thin;
}

.reader-toc-title {
  display: block;
  padding-bottom: 16px;
  color: var(--nt-blue);
  border-bottom: 1px solid var(--nt-line);
}

.reader-toc ol {
  padding: 0;
  list-style: none;
}

.reader-toc li {
  border-bottom: 1px solid rgba(233, 237, 242, 0.07);
}

.reader-toc a {
  display: block;
  padding: 10px 0;
  color: #9aa4ad;
  font-size: 0.69rem;
  line-height: 1.45;
}

.reader-toc a:hover {
  color: var(--nt-white);
}

.reader-toc .toc-book a {
  padding-top: 16px;
  color: var(--nt-blue);
  font-size: 0.61rem;
  font-weight: 780;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.reader-article {
  min-width: 0;
  color: #d4dae0;
  font-family: var(--nt-font-serif);
}

.reader-article > :first-child {
  margin-top: 0;
}

.reader-article .front-heading,
.reader-article .book-heading,
.reader-article .chapter-heading {
  scroll-margin-top: 104px;
}

.reader-article .front-heading,
.reader-article .book-heading {
  margin: 6.5rem 0 2rem;
  padding-top: 1.2rem;
  color: var(--nt-white);
  font-family: var(--nt-font-sans);
  font-size: clamp(2.15rem, 5vw, 3.4rem);
  font-weight: 730;
  letter-spacing: -0.045em;
  line-height: 1;
  border-top: 1px solid var(--nt-line-strong);
}

.reader-article .book-heading {
  color: var(--nt-blue);
  font-size: clamp(1.65rem, 3.5vw, 2.5rem);
  letter-spacing: -0.025em;
  line-height: 1.1;
}

.reader-article .chapter-heading {
  margin: 5rem 0 2rem;
  color: var(--nt-white);
  font-family: var(--nt-font-sans);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 720;
  letter-spacing: -0.04em;
  line-height: 1.08;
}

.reader-article h3 {
  margin: 3rem 0 1rem;
  color: var(--nt-white);
  font-family: var(--nt-font-sans);
  font-size: clamp(1.22rem, 2.5vw, 1.55rem);
  font-weight: 700;
  letter-spacing: -0.018em;
  line-height: 1.25;
  scroll-margin-top: 104px;
}

.reader-article h4 {
  margin: 2.1rem 0 0.7rem;
  color: var(--nt-blue);
  font-family: var(--nt-font-sans);
  font-size: 0.8rem;
  font-weight: 780;
  letter-spacing: 0.1em;
  line-height: 1.4;
  text-transform: uppercase;
}

.reader-article p {
  margin: 0 0 1.35rem;
  font-size: 1.06rem;
  line-height: 1.84;
}

.reader-article p.article-text {
  padding-left: 18px;
  border-left: 2px solid var(--nt-blue-deep);
}

.reader-article p.source-text {
  color: #aeb6be;
  font-size: 0.92rem;
  line-height: 1.7;
}

.reader-article a {
  color: #a9cae8;
  text-decoration: underline;
  text-decoration-color: rgba(134, 169, 201, 0.45);
  text-underline-offset: 3px;
}

.reader-article strong {
  color: var(--nt-white);
  font-weight: 700;
}

.reader-article blockquote {
  margin: 2.2rem 0;
  padding: 1.4rem 1.6rem;
  color: var(--nt-white);
  font-size: 1.1rem;
  font-style: italic;
  line-height: 1.68;
  border-left: 3px solid var(--nt-blue);
  background: var(--nt-charcoal-soft);
}

.reader-article blockquote.cycle-quote {
  white-space: pre-line;
  font-family: var(--nt-font-sans);
  font-size: 0.9rem;
  font-style: normal;
  letter-spacing: 0.03em;
  line-height: 1.8;
}

.method-definition {
  margin: 1.6rem 0 2rem;
  padding: 1.2rem 1.35rem;
  border-left: 3px solid var(--nt-blue);
  background: var(--nt-charcoal-soft);
}

.method-definition strong {
  display: block;
  margin-bottom: 0.5rem;
  color: var(--nt-blue);
  font-family: var(--nt-font-sans);
  font-size: 0.74rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.method-definition p {
  margin-bottom: 0;
}

.method-principles ul {
  padding-left: 0;
  list-style: none;
}

.method-principles li {
  padding: 0.85rem 0 0.85rem 1.55rem;
  border-bottom: 1px solid var(--nt-line);
}

.method-principles li::before {
  float: left;
  margin-left: -1.55rem;
  color: var(--nt-blue);
  content: "—";
}

.reader-article ul,
.reader-article ol {
  margin: 1.25rem 0 1.75rem;
  padding-left: 1.55rem;
}

.reader-article li {
  margin: 0.6rem 0;
  padding-left: 0.35rem;
  font-size: 1.02rem;
  line-height: 1.7;
}

.reader-article li::marker {
  color: var(--nt-blue);
}

.reader-endnote {
  margin-top: 6rem;
  padding-top: 2rem;
  color: #8f9aa5;
  font-family: var(--nt-font-sans);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  border-top: 1px solid var(--nt-line);
}

.not-found {
  min-height: calc(100vh - 78px);
  display: grid;
  place-items: center;
  padding-block: 80px;
}

.not-found-card {
  max-width: 680px;
  padding: 50px;
  border-top: 1px solid var(--nt-blue);
  border-bottom: 1px solid var(--nt-line);
}

.not-found-card h1 {
  margin-top: 18px;
  font-size: clamp(3rem, 8vw, 6.4rem);
  letter-spacing: -0.06em;
  line-height: 0.92;
}

.not-found-card p {
  margin-top: 24px;
  color: var(--nt-mist-soft);
  font-family: var(--nt-font-serif);
  font-size: 1.15rem;
  line-height: 1.68;
}

@media (max-width: 900px) {
  .header-inner {
    padding-block: 18px;
    align-items: flex-start;
    flex-direction: column;
    gap: 12px;
  }

  .site-nav {
    width: 100%;
    justify-content: flex-start;
    gap: 18px;
    overflow-x: auto;
    scrollbar-width: none;
  }

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

  .hero {
    min-height: auto;
    grid-template-columns: 1fr;
  }

  .archive-mark {
    width: min(100%, 560px);
    align-self: auto;
  }

  .statement-grid,
  .citation-grid,
  .revision-grid {
    grid-template-columns: 1fr;
  }

  .publication-card {
    grid-template-columns: 1fr;
  }

  .publication-meta {
    width: min(100%, 440px);
  }

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

  .footer-links {
    justify-content: flex-start;
  }

  .copyright {
    grid-column: 1 / -1;
  }

  .reader-masthead-grid {
    grid-template-columns: 1fr;
  }

  .reader-meta {
    max-width: 420px;
  }

  .reader-layout {
    display: block;
    width: min(calc(100% - 48px), var(--nt-reading));
  }

  .reader-toc {
    display: none;
  }

  .mobile-toc {
    display: block;
    width: min(calc(100% - 48px), var(--nt-reading));
    margin: 34px auto 0;
    color: var(--nt-mist-soft);
    border-top: 1px solid var(--nt-line);
    border-bottom: 1px solid var(--nt-line);
  }

  .mobile-toc summary {
    padding: 16px 0;
    color: var(--nt-blue);
    font-size: 0.68rem;
    font-weight: 780;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    cursor: pointer;
  }

  .mobile-toc ol {
    margin: 0 0 18px;
    padding-left: 1.4rem;
  }

  .mobile-toc li {
    margin: 8px 0;
    color: #9aa4ad;
    font-size: 0.75rem;
    line-height: 1.45;
  }
}

@media (max-width: 620px) {
  .site-shell {
    width: min(calc(100% - 32px), var(--nt-shell));
  }

  .brand-series {
    display: none;
  }

  .site-nav {
    gap: 16px;
  }

  .site-nav a {
    font-size: 0.61rem;
  }

  .hero {
    padding-block: 68px 86px;
    gap: 62px;
  }

  .hero h1 {
    max-width: 10ch;
    font-size: clamp(3.65rem, 16vw, 4.6rem);
  }

  .hero-actions,
  .publication-actions {
    align-items: stretch;
    flex-direction: column;
  }

  .button {
    width: 100%;
  }

  .button + .button {
    margin-top: -1px;
    margin-left: 0;
  }

  .release-banner {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .release-banner time {
    white-space: normal;
  }

  .statement-grid,
  .citation-grid,
  .revision-grid {
    padding-block: 66px;
    gap: 44px;
  }

  .publications-section,
  .future-section {
    padding-block: 78px;
  }

  .publication-card {
    min-height: auto;
    gap: 54px;
    padding: 28px 22px;
  }

  .publication-number {
    top: 22px;
    right: 20px;
  }

  .publication-main h3 {
    font-size: clamp(2.65rem, 14vw, 4rem);
  }

  .future-record {
    grid-template-columns: 1fr auto;
    gap: 10px 18px;
  }

  .future-record h3 {
    grid-column: 1 / -1;
    grid-row: 2;
  }

  .status-tag {
    min-width: 0;
  }

  .copy-status {
    display: block;
    min-height: 1.2em;
    margin: 12px 0 0;
  }

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

  .copyright {
    grid-column: 1;
  }

  .reader-header-inner {
    min-height: 62px;
  }

  .reader-download {
    text-align: right;
  }

  .reader-masthead-grid,
  .reader-layout,
  .mobile-toc {
    width: min(calc(100% - 32px), var(--nt-reading));
  }

  .reader-layout {
    padding-block: 54px 90px;
  }

  .reader-article p {
    font-size: 1.01rem;
    line-height: 1.78;
  }

  .not-found-card {
    padding: 34px 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}

@media print {
  :root {
    color-scheme: light;
  }

  .reader-header,
  .reader-toc,
  .mobile-toc,
  .site-footer {
    display: none !important;
  }

  body,
  .reader-body,
  .reader-masthead {
    color: #111;
    background: #fff;
  }

  .reader-masthead {
    padding-block: 36px;
    border-color: #bbb;
  }

  .reader-layout {
    display: block;
    width: 100%;
    max-width: 7in;
    padding: 36px 0;
  }

  .reader-article,
  .reader-article p,
  .reader-deck {
    color: #222;
  }

  .reader-article .front-heading,
  .reader-article .book-heading,
  .reader-article .chapter-heading,
  .reader-article h3,
  .reader-article h4,
  .reader-masthead h1 {
    color: #111;
  }

  .reader-article a {
    color: #111;
    text-decoration: none;
  }
}