/* Ougennsei
   Paper, ink, rust, ochre.
   Change the look of the whole site from the variables below. */

:root {
  --paper: #f3eee4;
  --paper-2: #e7e0d4;
  --sheet: #e9e2d6;
  --ink: #241f1a;
  --ink-soft: #3c362e;
  --rust: #7a3e2a;
  --rust-deep: #5c2e1e;
  --ochre: #c6a36a;
  --muted: #5e574c;
  --rule: #d0c6b6;
  --font-heading: "Palatino Linotype", Palatino, "Iowan Old Style", "Songti SC", STSong, SimSun, Georgia, "Times New Roman", serif;
  --font-body: "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-mono: Consolas, "Cascadia Mono", "Segoe UI Mono", ui-monospace, monospace;
  --page-width: 1080px;
  --page-gutter: 24px;
  --header-height: 4.25rem;
  color-scheme: light;
}

html {
  background: var(--paper);
  scroll-padding-top: calc(var(--header-height) + 0.75rem);
}

body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.7;
}

html.lang-zh-hans body,
html.lang-zh-hant body,
html.lang-ja body {
  line-height: 1.85;
}

::selection {
  background: #e4c99a;
  color: var(--ink);
}

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

.skip-link {
  position: absolute;
  left: 1rem;
  top: -3rem;
  z-index: 20;
  padding: 0.45rem 0.7rem;
  background: var(--ink);
  color: var(--paper);
  text-decoration: none;
}

.skip-link:focus {
  top: 0.75rem;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* English is the default. Simplified, traditional, and Japanese share the .zh text, then i18n.js rewrites it. */
html:not(.lang-zh-hans):not(.lang-zh-hant):not(.lang-ja) .zh {
  display: none;
}

html.lang-zh-hans .en,
html.lang-zh-hant .en,
html.lang-ja .en {
  display: none;
}

html.i18n-wait .zh,
html.i18n-wait .abstract {
  visibility: hidden;
}

h1,
h2,
h3 {
  font-family: var(--font-heading);
  font-weight: 400;
  letter-spacing: -0.02em;
  line-height: 1.15;
  font-variant-numeric: oldstyle-nums;
}

html.lang-zh-hans h1,
html.lang-zh-hans h2,
html.lang-zh-hans h3,
html.lang-zh-hant h1,
html.lang-zh-hant h2,
html.lang-zh-hant h3,
html.lang-ja h1,
html.lang-ja h2,
html.lang-ja h3 {
  letter-spacing: 0;
  line-height: 1.3;
}

a {
  color: var(--rust);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.22em;
  text-decoration-color: rgba(122, 62, 42, 0.4);
}

a:hover {
  color: var(--rust-deep);
  text-decoration-color: currentColor;
}

a:visited {
  color: var(--rust-deep);
}

.container {
  width: min(var(--page-width), calc(100% - 2 * var(--page-gutter)));
  margin-inline: auto;
}

.kicker,
.section-label,
.path-line,
.issue-bar,
.breadcrumb,
.meta,
.filters button,
.lang-switch,
.nav-toggle,
.sidecar dt,
.card-index,
.status {
  font-family: var(--font-mono);
  font-variant-numeric: lining-nums;
}

.kicker,
.section-label,
.path-line,
.breadcrumb,
.sidecar dt,
.card-index {
  color: var(--muted);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 5;
  background: var(--paper);
  border-bottom: 1px solid var(--rule);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  min-height: var(--header-height);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--ink);
  text-decoration: none;
  font-family: var(--font-heading);
  font-size: 1.28rem;
  letter-spacing: 0.12em;
  font-variant-caps: all-small-caps;
  font-variant-numeric: lining-nums;
  line-height: 1;
}

.brand:hover,
.brand:visited {
  color: var(--ink);
}

.brand-mark {
  width: 0.38rem;
  height: 0.38rem;
  background: var(--rust);
  transform: translateY(0.08rem);
}

.site-nav {
  margin-left: auto;
}

.site-nav ul {
  display: flex;
  align-items: baseline;
  gap: 1.35rem;
}

.site-nav a {
  color: var(--ink);
  text-decoration: none;
  font-size: 0.98rem;
}

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

.site-nav a[aria-current="page"] {
  box-shadow: inset 0 -1px 0 var(--rust);
}

.lang-switch {
  display: inline-flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
  gap: 0.28rem 0.35rem;
  max-width: 16rem;
  margin-left: 0.35rem;
  padding-left: 1rem;
  border-left: 1px solid var(--rule);
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  line-height: 1.4;
}

.lang-switch button {
  color: var(--muted);
  padding: 0.2rem 0;
}

.lang-switch button[aria-pressed="true"] {
  color: var(--ink);
}

.lang-switch button:hover {
  color: var(--rust);
}

.nav-toggle {
  display: none;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  font-size: 0.72rem;
  padding: 0.25rem 0;
  border-bottom: 1px solid var(--ink);
  color: var(--ink);
}

.nav-toggle .label-close {
  display: none;
}

.nav-toggle[aria-expanded="true"] {
  color: var(--rust);
  border-bottom-color: var(--rust);
}

.nav-toggle[aria-expanded="true"] .label-open {
  display: none;
}

.nav-toggle[aria-expanded="true"] .label-close {
  display: inline;
}

/* Front page */
.issue-bar {
  border-bottom: 1px solid var(--ink);
  box-shadow: 0 3px 0 var(--paper), 0 4px 0 var(--ink);
}

.issue-bar-inner {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.55rem 0 0.5rem;
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.issue-bar-inner > span:nth-child(2) {
  text-align: center;
}

.issue-bar-inner > span:last-child {
  text-align: right;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(260px, 0.8fr);
  gap: 3.5rem;
  align-items: start;
  padding: 2.6rem 0 2.2rem;
}

.hero-kicker {
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

.mark {
  width: 0.5rem;
  height: 0.5rem;
  background: var(--rust);
  flex: none;
}

.hero-title {
  margin-top: 0.85rem;
  font-size: clamp(2.7rem, 5.5vw, 4.7rem);
  line-height: 1.02;
  letter-spacing: -0.03em;
  max-width: 11em;
}

html.lang-zh-hans .hero-title,
html.lang-zh-hant .hero-title {
  letter-spacing: 0.14em;
  line-height: 1.18;
  max-width: 4.2em;
}

html.lang-ja .hero-title {
  letter-spacing: 0;
  line-height: 1.28;
  max-width: 8em;
}

.hero-title span {
  display: block;
}

.deck {
  margin-top: 1.35rem;
  max-width: 28rem;
  font-family: var(--font-heading);
  font-style: italic;
  font-size: 1.35rem;
  line-height: 1.4;
  letter-spacing: 0;
}

.lede {
  margin-top: 0.85rem;
  max-width: 36rem;
  color: var(--ink-soft);
  font-size: 1.08rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem 0.75rem;
  margin-top: 1.5rem;
  font-size: 1.02rem;
}

.action-sep {
  color: var(--muted);
}

.path-line {
  margin-top: 2rem;
}

.plate {
  margin: 0.35rem 0 0 auto;
  max-width: 420px;
}

.layout .plate {
  margin: 0 0 0.4rem;
  max-width: 36rem;
}

.plate img {
  width: 100%;
  height: auto;
  border: 1px solid var(--ink);
}

.plate figcaption {
  margin-top: 0.7rem;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

/* Contents */
.toc {
  padding-bottom: 1rem;
}

.toc .kicker {
  margin-bottom: 0.75rem;
}

.toc-list {
  border-top: 1px solid var(--ink);
}

.toc-list a {
  display: grid;
  grid-template-columns: 3rem 8.5rem minmax(0, 1fr) auto;
  gap: 0.75rem 1rem;
  align-items: baseline;
  padding: 0.85rem 0;
  border-bottom: 1px solid var(--rule);
  color: inherit;
  text-decoration: none;
}

.toc-list a:hover .toc-title,
.toc-list a:hover .toc-no,
.toc-list a:hover .toc-go {
  color: var(--rust);
}

.toc-no,
.entry-id {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--rust);
  font-variant-numeric: lining-nums;
}

.toc-title {
  font-family: var(--font-heading);
  font-size: 1.45rem;
  letter-spacing: -0.02em;
}

.toc-dek {
  color: var(--ink-soft);
  font-size: 0.98rem;
}

.toc-go,
.entry-go {
  color: var(--muted);
  transition: transform 160ms ease;
}

.toc-list a:hover .toc-go,
.entry-link:hover .entry-go {
  transform: translateX(4px);
  color: var(--rust);
}

/* Sections */
.section {
  padding-block: 4.25rem 3.5rem;
  border-top: 1px solid var(--rule);
}

.section-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  padding-bottom: 0.85rem;
  border-bottom: 1px solid var(--ink);
}

.section-head h2 {
  font-size: clamp(1.85rem, 3vw, 2.4rem);
}

.section-no {
  margin-right: 0.7rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--rust);
  font-variant-numeric: lining-nums;
}

.section-intro {
  max-width: 38rem;
  margin: 1rem 0 0.35rem;
  color: var(--ink-soft);
}

.entry-link {
  display: grid;
  grid-template-columns: 3.25rem minmax(0, 1fr) auto;
  gap: 0.5rem 1.25rem;
  align-items: baseline;
  padding: 1.25rem 0 1.2rem;
  border-bottom: 1px solid var(--rule);
  color: inherit;
  text-decoration: none;
}

.entry:last-child .entry-link {
  border-bottom-color: var(--ink);
}

.entry-kicker {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 0.7rem;
  align-items: baseline;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.entry-title {
  display: block;
  margin-top: 0.28rem;
  font-family: var(--font-heading);
  font-size: clamp(1.45rem, 2.4vw, 1.85rem);
  letter-spacing: -0.02em;
  line-height: 1.2;
  text-wrap: balance;
}

.entry-link:hover .entry-title {
  color: var(--rust);
}

.entry-dek {
  display: block;
  margin-top: 0.35rem;
  color: var(--ink-soft);
}

.section-more {
  margin-top: 1.1rem;
}

.status {
  color: var(--rust);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-size: 0.7rem;
}

.journal-list .entry-title {
  font-size: clamp(1.55rem, 2.6vw, 2.05rem);
}

/* Briefing */
.briefing {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.75rem;
  margin-top: 1.4rem;
}

.briefing article {
  padding-top: 0.85rem;
  border-top: 1px solid var(--rule);
}

.briefing h2,
.briefing h3 {
  margin: 0.45rem 0 0.45rem;
  font-size: 1.4rem;
}

.briefing p {
  color: var(--ink-soft);
}

.briefing a {
  display: inline-block;
  margin-top: 0.7rem;
}

/* About band */
.about-band {
  background: var(--paper-2);
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
}

.about-band-inner {
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
  gap: 2rem 3rem;
  padding-block: 3.5rem;
  align-items: start;
}

.about-band h2 {
  font-size: clamp(2rem, 4vw, 2.8rem);
  max-width: 8em;
}

.about-band p + p {
  margin-top: 0.8rem;
}

.about-band .lede-link {
  margin-top: 1.1rem;
}

/* Footer */
.site-footer {
  padding: 2.75rem 0 1.5rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr 1fr;
  gap: 2rem;
  padding-bottom: 1.75rem;
  border-bottom: 1px solid var(--ink);
}

.footer-brand {
  font-family: var(--font-heading);
  font-size: 1.7rem;
  letter-spacing: 0.08em;
  font-variant-caps: all-small-caps;
}

.footer-note {
  margin-top: 0.45rem;
  max-width: 22rem;
  color: var(--ink-soft);
}

.footer-nav,
.footer-contact {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.35rem;
}

.footer-nav a,
.footer-contact a {
  color: var(--ink);
  text-decoration: none;
}

.footer-nav a:hover,
.footer-contact a:hover {
  color: var(--rust);
}

.footer-motto {
  margin-top: 0.85rem;
  font-family: var(--font-heading);
  font-style: italic;
  font-size: 1.25rem;
  letter-spacing: 0;
  color: var(--ink);
}

.colophon {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1.25rem;
  padding-top: 0.9rem;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

/* Inner pages */
.page-header {
  padding: 2.4rem 0 1.8rem;
  border-bottom: 1px solid var(--rule);
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 0.55rem;
  margin-bottom: 1rem;
}

.breadcrumb a {
  color: var(--muted);
  text-decoration: none;
}

.breadcrumb a:hover {
  color: var(--rust);
}

.page-header h1 {
  max-width: 16em;
  font-size: clamp(2.15rem, 4.5vw, 3.55rem);
  text-wrap: balance;
}

.page-header .deck {
  margin-top: 1rem;
  max-width: 36rem;
}

.layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 15.5rem;
  gap: 3.5rem;
  padding: 2.2rem 0 4.5rem;
  align-items: start;
}

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

.stack > * + * {
  margin-top: 1rem;
}

.stack h2 {
  margin-top: 2.1rem;
  font-size: 1.7rem;
}

.prose {
  max-width: 40rem;
}

.prose p,
.prose ul,
.prose ol,
.prose blockquote,
.abstract {
  margin-top: 1rem;
}

.prose ul,
.prose ol {
  margin-left: 1.15rem;
}

.prose li {
  margin-top: 0.35rem;
}

.prose ul li {
  list-style: disc;
}

.prose ol li {
  list-style: decimal;
}

.prose .timeline,
.prose .swatches {
  margin-left: 0;
}

.prose .timeline li,
.prose .swatches li {
  list-style: none;
  margin-top: 0;
}

.prose blockquote p {
  margin-top: 0;
}

.prose h2 {
  margin-top: 2.3rem;
  font-size: 1.65rem;
}

.dropcap::first-letter {
  float: left;
  margin: 0.12em 0.08em 0 0;
  font-family: var(--font-heading);
  font-size: 3.35rem;
  line-height: 0.75;
  color: var(--rust);
}

.abstract {
  max-width: 40rem;
  padding: 0.15rem 0 0.15rem 1rem;
  border-left: 2px solid var(--ochre);
  color: var(--ink-soft);
}

.abstract .kicker {
  display: block;
  margin-bottom: 0.35rem;
}

blockquote {
  margin-left: 0;
  padding-left: 1rem;
  border-left: 2px solid var(--rust);
  font-family: var(--font-heading);
  font-style: italic;
  font-size: 1.22rem;
  line-height: 1.45;
  letter-spacing: 0;
}

blockquote cite {
  display: block;
  margin-top: 0.65rem;
  font-family: var(--font-body);
  font-style: normal;
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.see-also {
  max-width: 40rem;
  margin-top: 2.4rem;
  padding-top: 1rem;
  border-top: 1px solid var(--rule);
}

.see-also p {
  margin-top: 0.35rem;
}

.see-also a {
  margin-right: 0.4rem;
}

.sidecar {
  position: sticky;
  top: calc(var(--header-height) + 1rem);
  padding-top: 0.75rem;
  border-top: 1px solid var(--ink);
}

.sidecar dt {
  margin-top: 0.95rem;
}

.sidecar dd {
  margin-top: 0.15rem;
}

.sidecar ul {
  margin-top: 0.2rem;
}

.sidecar li + li {
  margin-top: 0.15rem;
}

.page-section {
  padding: 2.4rem 0 4.5rem;
}

.filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 1.1rem;
  margin: 1.15rem 0 0.2rem;
}

.filters button {
  color: var(--muted);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-size: 0.72rem;
  padding-bottom: 0.12rem;
  border-bottom: 1px solid transparent;
}

.filters button[aria-pressed="true"] {
  color: var(--ink);
  border-bottom-color: var(--rust);
}

.filters button:hover {
  color: var(--rust);
}

/* Reading cards */
.catalog {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-top: 1.5rem;
}

.card {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  min-height: 100%;
  padding: 1.15rem 1.15rem 1.25rem;
  border: 1px solid var(--rule);
  border-left: 3px solid var(--ink);
  background: transparent;
}

.card-top {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: baseline;
}

.card h2,
.card h3 {
  font-size: 1.7rem;
  letter-spacing: -0.02em;
}

.card .original {
  color: var(--muted);
  font-family: var(--font-heading);
}

.field dt {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--rust);
}

.field dd {
  margin-top: 0.2rem;
}

.method {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 1.4rem;
  padding-top: 1rem;
  border-top: 1px solid var(--rule);
}

.method strong {
  display: block;
  margin-bottom: 0.25rem;
  font-family: var(--font-heading);
  font-weight: 400;
  font-size: 1.15rem;
}

.method span {
  color: var(--ink-soft);
  font-size: 0.95rem;
}

/* About */
.timeline {
  margin-top: 0.5rem;
  border-top: 1px solid var(--ink);
}

.timeline li {
  display: grid;
  grid-template-columns: 3.25rem minmax(0, 1fr);
  gap: 1rem;
  padding: 1.15rem 0;
  border-bottom: 1px solid var(--rule);
}

.timeline h3 {
  font-size: 1.45rem;
}

.timeline p {
  margin-top: 0.3rem;
  color: var(--ink-soft);
}

.fact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-top: 1.25rem;
}

.fact {
  padding-top: 0.75rem;
  border-top: 1px solid var(--rule);
}

.fact h3 {
  margin: 0.35rem 0;
  font-size: 1.35rem;
}

.swatches {
  display: grid;
  gap: 0.45rem;
  margin-top: 0.8rem;
}

.swatches li {
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

.swatch {
  width: 0.9rem;
  height: 0.9rem;
  border: 1px solid var(--ink);
  flex: none;
}

.swatch-paper { background: var(--paper); }
.swatch-ink { background: var(--ink); }
.swatch-rust { background: var(--rust); }
.swatch-ochre { background: var(--ochre); }

code,
.token {
  font-family: var(--font-mono);
  font-size: 0.88em;
}

.pager {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  max-width: 40rem;
  margin-top: 2rem;
  padding-top: 1rem;
  border-top: 1px solid var(--ink);
}

.pager a {
  color: var(--ink);
  text-decoration: none;
  font-family: var(--font-heading);
  font-size: 1.15rem;
}

.pager a:hover {
  color: var(--rust);
}

.empty-note,
.note-line {
  margin-top: 1.15rem;
  color: var(--muted);
  font-size: 0.95rem;
}

.filetree {
  margin-top: 1rem;
  padding: 1rem 1.1rem;
  overflow-x: auto;
  background: var(--paper-2);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 0.82rem;
  line-height: 1.6;
  white-space: pre;
}