/*
 * SDZJOY editorial system
 * An original Chinese engineering design built around quiet paper tones,
 * expressive serif typography, generous spacing and precise rules.
 */

:root {
  color-scheme: light;
  --paper: #faf9f5;
  --paper-warm: #f0eee6;
  --paper-deep: #e8e6dc;
  --ink: #141413;
  --muted: #5e5d59;
  --faint: #77756f;
  --clay: #d97757;
  --clay-dark: #bd5d3f;
  --olive: #788c5d;
  --positive: #536641;
  --line: rgb(20 20 19 / 16%);
  --line-strong: rgb(20 20 19 / 42%);
  --surface: #fff;
  --bg: var(--paper);
  --bg-deep: var(--paper-warm);
  --panel: #fff;
  --panel-raised: #fff;
  --accent: var(--clay-dark);
  --accent-strong: #a8472e;
  --accent-ink: #fff;
  --signal: var(--clay);
  --reading-bg: #fff;
  --reading-ink: var(--ink);
  --shadow: none;
  --radius-sm: 0;
  --radius: 0;
  --font-serif: "Noto Serif SC", "Source Han Serif SC", "Source Han Serif CN", "Songti SC", STSong, SimSun, serif;
  --font-sans: system-ui, -apple-system, "Segoe UI", "Noto Sans SC", "Source Han Sans SC", "Microsoft YaHei UI", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", Consolas, monospace;
  --page-gutter: clamp(1.25rem, 4.45vw, 4rem);
  --section-space: clamp(5rem, 11vw, 10rem);
  --type-caption: clamp(0.7rem, 0.1vw + 0.68rem, 0.76rem);
  --type-ui: clamp(0.82rem, 0.12vw + 0.79rem, 0.9rem);
  --type-body: clamp(1rem, 0.16vw + 0.96rem, 1.08rem);
  --type-lede: clamp(1.12rem, 0.48vw + 1rem, 1.38rem);
  --type-card-title: clamp(1.55rem, 1.15vw + 1.18rem, 2.35rem);
  --type-section: clamp(2.45rem, 3.2vw + 1.2rem, 4.65rem);
  --type-display: clamp(3.75rem, 5.6vw + 1rem, 6.85rem);
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --paper: #1c1b18;
  --paper-warm: #25231f;
  --paper-deep: #302d27;
  --ink: #f4f1e8;
  --muted: #c3bfb5;
  --faint: #9d988e;
  --positive: #afc592;
  --line: rgb(244 241 232 / 16%);
  --line-strong: rgb(244 241 232 / 40%);
  --surface: #25231f;
  --bg: var(--paper);
  --bg-deep: var(--paper-warm);
  --panel: #25231f;
  --panel-raised: #2a2823;
  --reading-bg: #f7f4ec;
  --reading-ink: #171612;
}

html {
  background: var(--paper);
}

body {
  color: var(--ink);
  background: var(--paper);
  background-image: none;
  font-family: var(--font-sans);
  font-size: var(--type-body);
  line-height: 1.68;
  letter-spacing: 0;
  text-rendering: optimizelegibility;
}

body,
button,
input,
select,
textarea {
  -webkit-font-smoothing: antialiased;
}

button,
input,
textarea,
select,
.site-header,
.site-footer,
.eyebrow,
.button,
.primary-link,
.scope-badge,
.status-badge,
.verification,
.record-code,
.tag-row,
.content-card__meta,
.catalog-summary,
.filter-panel,
.account-actions,
.footer-meta {
  font-family: var(--font-sans);
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-serif);
  font-weight: 500;
  letter-spacing: -0.025em;
  text-wrap: balance;
}

p,
li,
dd {
  text-wrap: pretty;
}

a {
  text-underline-offset: 0.17em;
}

::selection {
  color: var(--ink);
  background: color-mix(in srgb, var(--clay) 48%, white);
}

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

.shell,
.page-shell {
  width: min(89.5rem, calc(100% - (var(--page-gutter) * 2)));
  margin-inline: auto;
}

.page-shell--narrow {
  width: min(62rem, calc(100% - (var(--page-gutter) * 2)));
}

.skip-link {
  color: #fff;
  background: var(--ink);
  font-family: var(--font-sans);
}

/* Header */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--paper) 94%, transparent);
  backdrop-filter: blur(14px);
}

.header-inner {
  grid-template-columns: minmax(11rem, auto) minmax(0, 1fr) auto;
  gap: clamp(1rem, 3vw, 3.5rem);
  width: min(100%, calc(100% - (var(--page-gutter) * 2)));
  min-height: 80px;
}

.brand {
  gap: 0.75rem;
  color: var(--ink);
  font-family: var(--font-serif);
  font-weight: 600;
}

.brand-name {
  display: block;
  font-size: 1.34rem;
  letter-spacing: -0.035em;
}

.brand-edition {
  padding-left: 0.75rem;
  color: var(--muted);
  border-left: 1px solid var(--line-strong);
  font-family: var(--font-sans);
  font-size: var(--type-caption);
  font-weight: 600;
  letter-spacing: 0.14em;
}

.brand-mark {
  display: none;
}

.site-nav {
  gap: clamp(0.75rem, 1.65vw, 1.6rem);
}

.site-nav a,
.account-link,
.subsite-switcher summary,
.theme-toggle {
  color: var(--ink);
  font-size: var(--type-ui);
  font-weight: 500;
  letter-spacing: 0;
}

.site-nav a:hover,
.site-nav a[aria-current="page"],
.account-link:hover,
.subsite-switcher summary:hover,
.theme-toggle:hover {
  color: var(--clay-dark);
}

.site-nav a[aria-current="page"] {
  text-decoration-color: var(--clay-dark);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.55rem;
}

.header-actions {
  gap: 1rem;
}

.theme-toggle,
.nav-toggle {
  min-width: 2rem;
  padding: 0.25rem;
  color: var(--ink);
  border: 0;
  background: transparent;
}

.subsite-menu {
  top: calc(100% + 1.2rem);
  width: 13rem;
  padding: 0;
  border: 1px solid var(--ink);
  background: var(--paper);
  box-shadow: none;
}

.subsite-menu a {
  padding: 0.8rem 1rem;
  border-bottom: 1px solid var(--line);
  font-size: 0.82rem;
}

.subsite-menu a:last-child {
  border-bottom: 0;
}

.subsite-menu a:hover {
  color: var(--ink);
  background: var(--paper-warm);
}

/* Shared typography and controls */

.eyebrow,
.brand small {
  color: var(--muted);
  font-family: var(--font-sans);
  font-size: var(--type-caption);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.lede {
  color: var(--muted);
  font-family: var(--font-sans);
  font-size: var(--type-lede);
  line-height: 1.65;
}

.button,
.primary-link {
  min-height: 44px;
  padding: 0.72rem 1.05rem;
  color: var(--ink);
  border: 1px solid var(--ink);
  border-radius: 0;
  background: transparent;
  font-size: var(--type-ui);
  font-weight: 600;
  transition: color 160ms ease, background 160ms ease;
}

.button:hover,
.primary-link:hover,
.button--ghost:hover {
  color: var(--paper);
  border-color: var(--ink);
  background: var(--ink);
}

.button--primary,
.primary-link,
.button--ink {
  color: var(--paper);
  border-color: var(--ink);
  background: var(--ink);
}

.button--primary:hover,
.primary-link:hover,
.button--ink:hover {
  color: #fff;
  border-color: var(--clay-dark);
  background: var(--clay-dark);
}

.arrow-link,
.text-link {
  display: inline-flex;
  gap: 0.55rem;
  align-items: center;
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: var(--type-ui);
  font-weight: 600;
  text-decoration-line: underline;
  text-decoration-color: var(--line-strong);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.4em;
}

.arrow-link:hover,
.text-link:hover {
  color: var(--clay-dark);
  text-decoration-color: currentcolor;
}

/* Homepage */

.editorial-hero {
  display: grid;
  min-height: min(780px, calc(100vh - 80px));
  padding-block: clamp(2.2rem, 5vh, 4.25rem) clamp(3.5rem, 7vh, 6rem);
}

.hero-kicker {
  display: flex;
  justify-content: space-between;
  align-self: start;
  padding-top: 0.8rem;
  border-top: 1px solid var(--ink);
  font-family: var(--font-sans);
  font-size: var(--type-caption);
  font-weight: 600;
  letter-spacing: 0.075em;
  line-height: 1.5;
  text-transform: uppercase;
}

.editorial-hero h1 {
  align-self: center;
  max-width: 15ch;
  margin: clamp(3.5rem, 8vh, 6.5rem) 0;
  font-size: var(--type-display);
  font-weight: 400;
  line-height: 1.03;
  letter-spacing: -0.035em;
}

.editorial-hero h1 a {
  color: inherit;
  text-decoration-color: var(--clay);
  text-decoration-thickness: 0.055em;
  text-underline-offset: 0.08em;
}

.editorial-hero h1 a:hover {
  color: var(--clay-dark);
}

.hero-bottom {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 3rem;
  align-self: end;
  align-items: end;
  padding-top: 1rem;
  border-top: 1px solid var(--line-strong);
}

.hero-bottom p {
  max-width: 45rem;
  margin: 0;
  color: var(--muted);
  font-size: clamp(1rem, 0.35vw + 0.94rem, 1.16rem);
  line-height: 1.72;
}

.manifesto-section {
  padding-block: var(--section-space);
  color: var(--ink);
  background: var(--paper-warm);
}

.manifesto-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(18rem, 0.7fr);
  gap: clamp(3rem, 10vw, 10rem);
  align-items: start;
}

.manifesto-grid h2 {
  max-width: 11ch;
  margin: 0;
  font-size: clamp(2.9rem, 5vw, 5.35rem);
  line-height: 1.05;
  letter-spacing: -0.035em;
}

.manifesto-grid > div {
  padding-top: 0.7rem;
  border-top: 1px solid currentcolor;
}

.manifesto-grid p {
  margin: 0 0 2rem;
  font-size: var(--type-lede);
  line-height: 1.68;
}

.practice-section,
.index-section {
  padding-block: var(--section-space);
}

.editorial-heading {
  display: grid;
  grid-template-columns: minmax(10rem, 0.35fr) minmax(0, 1fr);
  gap: 3rem;
  margin-bottom: clamp(3rem, 7vw, 6rem);
  padding-top: 1rem;
  border-top: 1px solid var(--ink);
}

.editorial-heading > p,
.index-section > header > p,
.footer-statement > p {
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--type-caption);
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.editorial-heading h2 {
  max-width: 20ch;
  margin: 0;
  font-size: var(--type-section);
  line-height: 1.08;
  letter-spacing: -0.03em;
}

.practice-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  border-top: 1px solid var(--ink);
}

.practice-grid > a {
  position: relative;
  display: flex;
  flex-direction: column;
  min-height: 27rem;
  padding: 1rem 1.25rem 1.3rem;
  border-right: 1px solid var(--line-strong);
  text-decoration: none;
  transition: background 160ms ease;
}

.practice-grid > a:last-child {
  border-right: 0;
}

.practice-grid > a:hover {
  color: var(--ink);
  background: var(--paper-warm);
}

.practice-grid span {
  font-family: var(--font-sans);
  font-size: var(--type-caption);
  font-weight: 600;
}

.practice-grid h3 {
  margin: auto 0 1rem;
  font-size: var(--type-card-title);
  line-height: 1.14;
  letter-spacing: -0.025em;
}

.practice-grid p {
  min-height: 7.5rem;
  margin: 0;
  color: var(--muted);
  font-size: 0.96rem;
  line-height: 1.72;
}

.practice-grid i {
  margin-top: 1rem;
  font-family: var(--font-sans);
  font-style: normal;
}

.index-section {
  border-top: 1px solid var(--line);
}

.index-section > header {
  display: grid;
  grid-template-columns: minmax(10rem, 0.35fr) 1fr;
  gap: 3rem;
  margin-bottom: 4rem;
}

.index-section > header h2 {
  max-width: 19ch;
  margin: 0;
  font-size: var(--type-section);
  line-height: 1.08;
  letter-spacing: -0.03em;
}

.index-note {
  max-width: 42rem;
  margin: -1rem 0 3rem calc(35% + 1.95rem);
  color: var(--muted);
  line-height: 1.72;
}

.workspace-map {
  grid-template-columns: repeat(7, minmax(0, 1fr));
  margin-top: 0;
  border-top: 1px solid var(--ink);
  border-left: 0;
}

.workspace-map a {
  min-height: 13rem;
  padding: 1rem 0.85rem;
  border-right: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--ink);
  font-family: var(--font-serif);
  font-size: 1.38rem;
  font-weight: 500;
}

.workspace-map a:last-child {
  border-right: 0;
}

.workspace-map a:hover {
  color: var(--ink);
  background: var(--paper-warm);
}

.workspace-map span,
.workspace-map i {
  color: var(--muted);
  font-family: var(--font-sans);
  font-size: var(--type-caption);
  font-weight: 600;
}

.workspace-map strong {
  font-weight: 500;
}

.hvac-feature {
  padding-block: var(--section-space);
  color: #171612;
  background: var(--clay);
}

.hvac-feature__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(22rem, 0.65fr);
  gap: clamp(4rem, 10vw, 10rem);
  align-items: end;
}

.hvac-feature .eyebrow {
  color: #171612;
}

.hvac-feature h2 {
  max-width: 14ch;
  margin: 1.5rem 0 2rem;
  font-size: clamp(2.9rem, 5.2vw, 5.45rem);
  line-height: 1.05;
  letter-spacing: -0.035em;
}

.hvac-feature__grid > div:first-child > p:not(.eyebrow) {
  max-width: 40rem;
  margin-bottom: 2rem;
  font-size: var(--type-body);
  line-height: 1.72;
}

.parameter-sheet {
  padding: 1.3rem;
  border: 1px solid #171612;
  background: rgb(250 249 245 / 20%);
}

.parameter-sheet > div {
  display: flex;
  justify-content: space-between;
  padding-bottom: 0.8rem;
  border-bottom: 1px solid #171612;
  font-family: var(--font-sans);
  font-size: var(--type-caption);
  font-weight: 600;
  letter-spacing: 0.08em;
}

.parameter-sheet h3 {
  margin: 3.5rem 0;
  font-size: clamp(2.45rem, 4vw, 4.25rem);
  line-height: 1.04;
  letter-spacing: -0.035em;
}

.parameter-sheet dl {
  margin: 0;
  border-top: 1px solid #171612;
}

.parameter-sheet dl div {
  display: grid;
  grid-template-columns: 4rem 1fr;
  gap: 1rem;
  padding-block: 0.75rem;
  border-bottom: 1px solid rgb(23 22 18 / 36%);
}

.parameter-sheet dt {
  font-family: var(--font-sans);
  font-size: var(--type-caption);
  font-weight: 600;
}

.parameter-sheet dd {
  margin: 0;
}

.subscribe-band {
  color: var(--ink);
  border-color: var(--ink);
  background: var(--paper-warm);
}

.subscribe-band__inner {
  padding-block: clamp(4rem, 8vw, 7rem);
}

.subscribe-band h2 {
  font-size: clamp(2.7rem, 4.5vw, 4.85rem);
  font-weight: 400;
  line-height: 1.05;
  letter-spacing: -0.035em;
}

/* Content sections and cards */

.section {
  padding-block: var(--section-space);
}

.section--ruled,
.split-sections {
  border-color: var(--line-strong);
}

.section-heading {
  margin-bottom: 3rem;
  padding-top: 1rem;
  border-top: 1px solid var(--ink);
}

.section-heading h2 {
  font-size: var(--type-section);
  font-weight: 400;
  line-height: 1.08;
  letter-spacing: -0.03em;
}

.card-grid,
.record-list {
  gap: 0;
  border-top: 1px solid var(--ink);
}

.content-card,
.record-card {
  min-height: 22rem;
  padding: 1.3rem;
  border: 0;
  border-right: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--ink);
  border-radius: 0;
  background: transparent;
  box-shadow: none;
  transition: background 160ms ease;
}

.content-card:last-child,
.record-card:nth-child(3n) {
  border-right: 0;
}

.content-card:hover,
.record-card:hover {
  border-color: var(--line-strong);
  background: var(--paper-warm);
  transform: none;
}

.record-card::before {
  display: none;
}

.content-card h2,
.record-card h2,
.record-card h3 {
  font-family: var(--font-serif);
  font-weight: 500;
  letter-spacing: -0.02em;
}

.content-card h2 {
  margin-top: auto;
  padding-top: 3rem;
  font-size: var(--type-card-title);
  line-height: 1.15;
}

.content-card > p,
.record-subtitle,
.record-card > p:not(.record-code),
.muted-copy {
  color: var(--muted);
}

.content-card__foot,
.record-card__foot {
  border-color: var(--line);
}

.card-arrow,
.record-card__foot {
  color: var(--ink);
}

.note-list,
.tool-list,
.version-list,
.timeline {
  border-color: var(--ink);
}

.note-list a,
.tool-list a,
.version-list article,
.timeline article {
  border-color: var(--line-strong);
}

.note-list a:hover span,
.tool-list a:hover strong,
.timeline a {
  color: var(--clay-dark);
}

.status-light {
  background: var(--olive);
  box-shadow: none;
}

/* Listing and detail pages */

.listing-page,
.detail-page,
.account-center,
.error-page,
.page-shell {
  padding-block: clamp(4rem, 9vw, 8rem);
}

.section-title,
.detail-title,
.auth-title,
.page-hero h1 {
  max-width: 17ch;
  font-family: var(--font-serif);
  font-size: clamp(3rem, 5.35vw, 5.6rem);
  font-weight: 400;
  line-height: 1.04;
  letter-spacing: -0.035em;
}

.catalog-intro {
  grid-template-columns: minmax(0, 1.35fr) minmax(13rem, auto);
  padding-bottom: clamp(3rem, 7vw, 6rem);
  border-bottom: 1px solid var(--ink);
}

.catalog-intro .lede {
  max-width: 48rem;
}

.catalog-actions {
  align-self: end;
}

.filter-panel,
.catalog-search {
  margin-top: 0;
  padding: 1.25rem 0;
  border: 0;
  border-bottom: 1px solid var(--ink);
  border-radius: 0;
  background: transparent;
}

.filter-panel label > span {
  color: var(--muted);
  font-family: var(--font-sans);
  font-weight: 600;
}

.filter-panel input,
.filter-panel select,
.catalog-search input,
.auth-panel input,
.auth-panel textarea,
.auth-panel select,
.feedback-panel select,
.feedback-panel textarea {
  color: var(--ink);
  border: 1px solid var(--line-strong);
  border-radius: 0;
  background: var(--surface);
}

.filter-panel input:focus,
.filter-panel select:focus,
.catalog-search input:focus {
  border-color: var(--ink);
  outline: 1px solid var(--ink);
}

.catalog-summary {
  margin-top: 1rem;
}

.catalog-summary a,
.fact-grid a,
.boundary-note a,
.detail-page > p a,
.promotion-link a,
.prose a {
  color: var(--clay-dark);
}

.record-list {
  margin-top: 1rem;
}

.record-code {
  color: var(--clay-dark);
}

.record-card h2,
.record-card h3 {
  font-size: clamp(1.4rem, 1.35vw + 1rem, 2.15rem);
  line-height: 1.18;
}

.scope-badge,
.status-badge,
.verification,
.membership-chip,
.tag-row span {
  color: var(--ink);
  border-color: var(--line-strong);
  border-radius: 100px;
  background: transparent;
  font-weight: 600;
}

.scope-badge--domestic,
.verification--ok {
  color: var(--positive);
  border-color: #788c5d;
  background: transparent;
}

.scope-badge--foreign,
.access-badge--l2,
.extraction-code strong {
  color: var(--clay-dark);
  border-color: var(--clay);
  background: transparent;
}

.empty-state {
  min-height: 22rem;
  padding: 2rem 0;
  border: 0;
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
  border-radius: 0;
}

.empty-state h2 {
  max-width: 18ch;
  font-size: clamp(2.3rem, 3.9vw, 4.15rem);
  font-weight: 400;
  line-height: 1.08;
  letter-spacing: -0.03em;
}

.detail-badges {
  margin-top: 1.5rem;
}

.boundary-note {
  padding: 1.1rem 0 1.1rem 1.25rem;
  border-left: 1px solid var(--clay-dark);
  background: transparent;
}

.record-section {
  margin-top: clamp(5rem, 10vw, 9rem);
}

.section-heading--compact {
  padding: 1rem 0;
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--line);
}

.section-heading--compact h2 {
  font-family: var(--font-serif);
  font-size: clamp(1.9rem, 2.8vw, 3.25rem);
  font-weight: 400;
}

.fact-grid {
  border-color: var(--ink);
}

.fact-grid div,
.relation-grid a,
.evidence-list article,
.mirror-grid article,
.feedback-panel,
.matrix-scroll,
.content-block th,
.content-block td {
  border-color: var(--line-strong);
  border-radius: 0;
  background: transparent;
}

.fact-grid dt,
.record-facts,
.evidence-list article > div,
.evidence-list p,
.evidence-list small {
  color: var(--muted);
}

.relation-grid a:hover,
.evidence-list article:hover {
  border-color: var(--ink);
  background: var(--paper-warm);
}

.relation-grid strong,
.feedback-panel summary {
  color: var(--clay-dark);
}

.coverage-table {
  background: transparent;
}

.coverage-table thead th {
  color: var(--ink);
  background: var(--paper-warm);
}

.coverage-table th,
.coverage-table td {
  border-color: var(--line-strong);
}

.mirror-grid article {
  background: transparent;
}

.extraction-code {
  border-radius: 0;
}

.reading-surface {
  max-width: 920px;
  border: 1px solid var(--line);
  border-radius: 0;
  box-shadow: none;
}

.prose {
  max-width: 820px;
  font-size: clamp(1.02rem, 0.25vw + 0.96rem, 1.12rem);
  line-height: 1.9;
}

.prose h2,
.prose h3,
.prose h4 {
  font-family: var(--font-serif);
  font-weight: 500;
}

.prose blockquote {
  border-color: var(--clay-dark);
}

.code-block pre,
.prose pre {
  color: #f4f1e8;
  border: 0;
  border-radius: 0;
  background: #1d1c19;
}

.prose :not(pre) > code {
  color: var(--ink);
  background: var(--paper-deep);
}

/* Professional article system */

.article-page {
  padding-block: clamp(3rem, 7vw, 7rem) clamp(6rem, 12vw, 11rem);
}

.article-page > article {
  min-width: 0;
}

.article-masthead {
  display: grid;
  grid-template-columns: minmax(0, 1.65fr) minmax(15rem, 0.55fr);
  gap: clamp(3rem, 9vw, 9rem);
  align-items: end;
  padding-top: 1rem;
  border-top: 1px solid var(--ink);
}

.article-masthead__copy {
  min-width: 0;
}

.article-masthead .detail-title {
  max-width: 15ch;
  margin: clamp(3rem, 7vw, 6.5rem) 0 1.8rem;
  font-size: clamp(3.1rem, 6.4vw, 7.25rem);
  font-weight: 400;
  line-height: 0.98;
  letter-spacing: -0.045em;
}

.article-masthead .lede {
  max-width: 46rem;
  margin: 0;
  font-size: clamp(1.12rem, 0.52vw + 1rem, 1.42rem);
}

.article-meta {
  margin: 0;
  border-top: 1px solid var(--ink);
}

.article-meta > div {
  display: grid;
  grid-template-columns: 5.7rem minmax(0, 1fr);
  gap: 1rem;
  padding-block: 0.8rem;
  border-bottom: 1px solid var(--line);
  font-family: var(--font-sans);
  font-size: var(--type-ui);
  line-height: 1.5;
}

.article-meta dt {
  color: var(--muted);
  font-weight: 500;
}

.article-meta dd {
  margin: 0;
  color: var(--ink);
  font-weight: 600;
}

.article-meta dd a {
  color: inherit;
}

.article-meta__topics i {
  color: var(--line-strong);
  font-style: normal;
}

.article-page .item-actions {
  margin-top: 2rem;
}

.article-cover {
  margin: clamp(3rem, 7vw, 7rem) 0 0;
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
  background: var(--paper-warm);
}

.article-cover img {
  display: block;
  width: 100%;
  max-height: min(72vh, 56rem);
  object-fit: cover;
}

.article-reading-area {
  display: grid;
  grid-template-columns: minmax(0, 920px);
  justify-content: center;
  margin-top: clamp(4rem, 9vw, 9rem);
}

.article-page .reading-surface {
  width: 100%;
  min-width: 0;
  max-width: none;
  padding: clamp(2rem, 5vw, 5rem) clamp(1.3rem, 5.5vw, 5.75rem);
  color: var(--reading-ink);
  border-color: var(--line-strong);
  background: var(--reading-bg);
  font-size: clamp(1.02rem, 0.24vw + 0.98rem, 1.13rem);
  line-height: 1.92;
}

.reading-surface > .content-block {
  min-width: 0;
  margin-block: 1.55rem;
}

.reading-surface > .content-block:first-child {
  margin-top: 0;
}

.reading-surface > .content-block:last-child {
  margin-bottom: 0;
}

.reading-surface > .content-block--heading,
.reading-surface > .content-block--section_heading {
  margin-top: clamp(3.75rem, 8vw, 6.5rem);
}

.reading-surface > .content-block--heading:first-child,
.reading-surface > .content-block--section_heading:first-child {
  margin-top: 0;
}

.reading-surface .content-block--section_heading h2,
.reading-surface .content-block--heading h2 {
  margin: 0;
  padding-top: 0.8rem;
  border-top: 1px solid var(--reading-ink);
  font-size: clamp(2rem, 3.8vw, 3.2rem);
  line-height: 1.16;
}

.reading-surface .content-block--section_heading h3 {
  margin: 0;
  font-size: clamp(1.55rem, 2.3vw, 2.1rem);
  line-height: 1.25;
}

.reading-surface .content-block--section_heading h4 {
  margin: 0;
  font-family: var(--font-sans);
  font-size: clamp(1.15rem, 1vw + 1rem, 1.4rem);
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: 0;
}

.content-block--paragraph > p:first-child,
.callout__content > p:first-child {
  margin-top: 0;
}

.content-block--paragraph > p:last-child,
.callout__content > p:last-child {
  margin-bottom: 0;
}

.editorial-divider {
  width: 5rem;
  margin: clamp(3.5rem, 7vw, 5.5rem) auto;
  border: 0;
  border-top: 1px solid var(--reading-ink);
}

.callout {
  position: relative;
  margin-block: clamp(2.5rem, 5vw, 4rem);
  padding: 1.35rem 1.5rem 1.45rem;
  color: var(--reading-ink);
  border-top: 1px solid var(--reading-ink);
  border-bottom: 1px solid color-mix(in srgb, var(--reading-ink) 24%, transparent);
  background: color-mix(in srgb, var(--paper-warm) 72%, white);
}

.callout::before {
  position: absolute;
  top: -1px;
  left: 0;
  width: 4.5rem;
  height: 4px;
  background: var(--clay-dark);
  content: "";
}

.callout--tip::before,
.callout--experience::before {
  background: var(--olive);
}

.callout--warning::before {
  background: #a13c31;
}

.callout__title {
  margin: 0 0 0.65rem;
  font-family: var(--font-sans);
  font-size: 0.78rem;
  font-weight: 750;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.engineering-equation {
  min-width: 0;
  margin: clamp(3rem, 6vw, 5rem) 0;
  padding-block: 1.2rem;
  border-top: 1px solid var(--reading-ink);
  border-bottom: 1px solid color-mix(in srgb, var(--reading-ink) 28%, transparent);
}

.engineering-equation__formula {
  display: flex;
  gap: 1.5rem;
  align-items: center;
  min-width: 0;
  padding: 1.5rem 0.25rem;
  overflow-x: auto;
  overscroll-behavior-inline: contain;
  scrollbar-gutter: stable;
}

.engineering-equation__formula math {
  flex: 1 0 max-content;
  min-width: max-content;
  font-size: clamp(1.08rem, 0.7vw + 1rem, 1.5rem);
}

.engineering-equation__number {
  position: sticky;
  right: 0;
  flex: 0 0 auto;
  padding-left: 1rem;
  color: color-mix(in srgb, var(--reading-ink) 70%, transparent);
  background: var(--reading-bg);
  font-family: var(--font-sans);
  font-size: var(--type-ui);
}

.engineering-equation figcaption,
.engineering-table figcaption,
.code-block figcaption {
  margin-top: 0.75rem;
  font-family: var(--font-sans);
  font-size: var(--type-ui);
  font-weight: 650;
  text-align: center;
}

.engineering-equation__variables {
  margin: 1.5rem 0 0;
  padding-top: 0.5rem;
  border-top: 1px solid color-mix(in srgb, var(--reading-ink) 18%, transparent);
}

.engineering-equation__variables > div {
  display: grid;
  grid-template-columns: minmax(4rem, 0.24fr) minmax(0, 1fr);
  gap: 1rem;
  padding-block: 0.45rem;
  border-bottom: 1px solid color-mix(in srgb, var(--reading-ink) 12%, transparent);
}

.engineering-equation__variables dt {
  font-family: var(--font-mono);
  font-weight: 700;
}

.engineering-equation__variables dd {
  margin: 0;
}

.engineering-table {
  min-width: 0;
  margin: clamp(3rem, 6vw, 5rem) 0;
}

.engineering-table__scroll,
.content-block--table {
  max-width: 100%;
  overflow-x: auto;
  overscroll-behavior-inline: contain;
  scrollbar-gutter: stable;
}

.engineering-table table,
.content-block--table table {
  width: 100%;
  min-width: max(36rem, 100%);
  border-collapse: collapse;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  line-height: 1.55;
}

.engineering-table th,
.engineering-table td,
.content-block--table th,
.content-block--table td {
  padding: 0.75rem 0.85rem;
  border: 1px solid color-mix(in srgb, var(--reading-ink) 28%, transparent);
  text-align: left;
  vertical-align: top;
}

.engineering-table th,
.content-block--table th {
  color: var(--reading-ink);
  background: color-mix(in srgb, var(--paper-warm) 75%, white);
  font-weight: 700;
}

.engineering-table__notes {
  display: grid;
  gap: 0.25rem;
  margin-top: 0.85rem;
  color: color-mix(in srgb, var(--reading-ink) 72%, transparent);
  font-family: var(--font-sans);
  font-size: 0.78rem;
  line-height: 1.55;
}

.engineering-table__notes p {
  margin: 0;
}

.parameter-card {
  margin: clamp(3rem, 6vw, 5rem) 0;
  padding: 1.25rem;
  color: var(--reading-ink);
  border: 1px solid var(--reading-ink);
  background: color-mix(in srgb, var(--paper-warm) 55%, white);
}

.parameter-card h3 {
  margin: 0 0 2rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--reading-ink);
  font-size: clamp(1.65rem, 2.5vw, 2.3rem);
}

.parameter-card dl {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin: 0;
  border-top: 1px solid color-mix(in srgb, var(--reading-ink) 18%, transparent);
  border-left: 1px solid color-mix(in srgb, var(--reading-ink) 18%, transparent);
}

.parameter-card__item {
  min-width: 0;
  padding: 1rem;
  border-right: 1px solid color-mix(in srgb, var(--reading-ink) 18%, transparent);
  border-bottom: 1px solid color-mix(in srgb, var(--reading-ink) 18%, transparent);
}

.parameter-card__item dt {
  color: color-mix(in srgb, var(--reading-ink) 68%, transparent);
  font-family: var(--font-sans);
  font-size: 0.76rem;
  font-weight: 600;
}

.parameter-card__item dd {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 0.45rem;
  align-items: baseline;
  margin: 0.45rem 0 0;
}

.parameter-card__item strong {
  font-family: var(--font-serif);
  font-size: clamp(1.55rem, 2vw, 2rem);
  font-weight: 500;
}

.parameter-card__item small {
  flex-basis: 100%;
  color: color-mix(in srgb, var(--reading-ink) 64%, transparent);
  font-family: var(--font-sans);
}

.content-image {
  margin: clamp(3rem, 7vw, 5.5rem) auto;
}

.content-image img {
  display: block;
  width: 100%;
  height: auto;
}

.content-image--wide,
.content-image--full {
  position: relative;
  left: 50%;
  width: min(68rem, calc(100vw - (var(--page-gutter) * 2)));
  max-width: none;
  transform: translateX(-50%);
}

.content-image--full {
  width: min(86rem, calc(100vw - (var(--page-gutter) * 2)));
}

.content-image figcaption {
  display: flex;
  gap: 0.5rem 1.5rem;
  justify-content: space-between;
  margin-top: 0.75rem;
  color: color-mix(in srgb, var(--reading-ink) 70%, transparent);
  font-family: var(--font-sans);
  font-size: 0.78rem;
  line-height: 1.5;
}

.content-image__source {
  flex: 0 0 auto;
}

.attachment-card,
.external-resource-card,
.reference-card {
  margin: clamp(2.5rem, 5vw, 4rem) 0;
  padding: 1.15rem 1.25rem;
  color: var(--reading-ink);
  border-top: 1px solid var(--reading-ink);
  border-bottom: 1px solid color-mix(in srgb, var(--reading-ink) 22%, transparent);
  background: color-mix(in srgb, var(--paper-warm) 58%, white);
}

.attachment-card > p,
.external-resource-card > p,
.reference-card > p {
  margin: 0.35rem 0;
}

.attachment-card > p:first-child,
.external-resource-card > p:first-child,
.reference-card__title {
  font-family: var(--font-sans);
  font-weight: 700;
}

.attachment-card a,
.external-resource-card a,
.reference-card a {
  color: var(--reading-ink);
  text-decoration-color: var(--clay-dark);
}

.reference-card__kind,
.reference-card__meta {
  color: color-mix(in srgb, var(--reading-ink) 68%, transparent);
  font-family: var(--font-sans);
  font-size: 0.76rem;
  letter-spacing: 0.06em;
}

.reference-card blockquote {
  margin: 1rem 0;
  padding-left: 1rem;
  font-size: 0.95em;
}

.code-block {
  min-width: 0;
  margin: clamp(2.5rem, 5vw, 4rem) 0;
}

.code-block pre {
  max-width: 100%;
  margin: 0;
  padding: 1.25rem;
  overflow: auto;
  overscroll-behavior: contain;
  font-size: 0.84rem;
  line-height: 1.7;
  tab-size: 2;
}

.article-references {
  display: grid;
  grid-template-columns: minmax(14rem, 0.42fr) minmax(0, 1fr);
  gap: clamp(3rem, 9vw, 9rem);
  margin-top: clamp(6rem, 12vw, 11rem);
  padding-top: 1rem;
  border-top: 1px solid var(--ink);
}

.article-references > header h2 {
  margin: 2rem 0 1rem;
  font-size: clamp(2.3rem, 4vw, 4rem);
  font-weight: 400;
  line-height: 1.08;
}

.article-references > header > p:last-child {
  max-width: 28rem;
  color: var(--muted);
  font-size: var(--type-ui);
}

.article-references ol {
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--ink);
  list-style: none;
}

.article-reference {
  display: grid;
  grid-template-columns: 3rem minmax(0, 1fr);
  gap: 1rem;
  padding-block: 1.3rem;
  border-bottom: 1px solid var(--line);
}

.article-reference__number {
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.76rem;
}

.article-reference p {
  margin: 0;
}

.article-reference__title {
  font-family: var(--font-serif);
  font-size: clamp(1.05rem, 0.35vw + 1rem, 1.2rem);
  line-height: 1.55;
}

.article-reference__secondary {
  margin-top: 0.35rem !important;
  color: var(--muted);
  font-family: var(--font-sans);
  font-size: 0.84rem;
}

.article-reference__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 1rem;
  margin-top: 0.8rem !important;
  color: var(--muted);
  font-family: var(--font-sans);
  font-size: 0.76rem;
}

.article-reference__source {
  display: inline-block;
  margin-top: 0.8rem;
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 0.78rem;
  font-weight: 650;
  text-underline-offset: 0.3em;
}

@media (max-width: 900px) {
  .article-masthead,
  .article-references {
    grid-template-columns: 1fr;
  }

  .article-masthead {
    gap: 3.5rem;
  }

  .article-masthead .detail-title {
    margin-top: 3rem;
  }

  .article-references {
    gap: 2rem;
  }
}

@media (max-width: 680px) {
  .article-page {
    padding-top: 2rem;
  }

  .article-masthead .detail-title {
    font-size: clamp(2.75rem, 14vw, 4.5rem);
  }

  .article-meta > div {
    grid-template-columns: 5.25rem minmax(0, 1fr);
  }

  .article-cover {
    width: calc(100% + (var(--page-gutter) * 2));
    margin-left: calc(var(--page-gutter) * -1);
  }

  .article-reading-area {
    width: calc(100% + (var(--page-gutter) * 1.15));
    margin-left: calc(var(--page-gutter) * -0.575);
  }

  .article-page .reading-surface {
    padding: 2.25rem 1.25rem;
  }

  .engineering-equation__formula,
  .engineering-table__scroll,
  .content-block--table,
  .code-block pre {
    -webkit-overflow-scrolling: touch;
  }

  .engineering-equation__formula {
    padding-block: 1rem;
  }

  .engineering-equation__variables > div {
    grid-template-columns: 3.5rem minmax(0, 1fr);
  }

  .parameter-card {
    padding: 1rem;
  }

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

  .content-image--wide,
  .content-image--full {
    width: calc(100vw - 1.25rem);
  }

  .content-image figcaption {
    display: grid;
  }

  .article-reference {
    grid-template-columns: 2.2rem minmax(0, 1fr);
  }
}

/* Accounts, notices and forms */

.auth-shell {
  width: min(44rem, calc(100% - (var(--page-gutter) * 2)));
}

.auth-panel,
.account-panel {
  padding: clamp(1.5rem, 5vw, 3rem);
  border: 1px solid var(--ink);
  border-radius: 0;
  background: transparent;
  box-shadow: none;
}

.auth-panel button,
.danger-zone button {
  color: var(--paper);
  border-radius: 0;
  background: var(--ink);
}

.message-list,
.notice-card {
  border: 0;
  border-left: 2px solid var(--clay-dark);
  border-radius: 0;
  background: var(--paper-warm);
}

.account-facts div {
  border-color: var(--line-strong);
}

.account-actions a {
  color: var(--ink);
  text-underline-offset: 0.3em;
}

.account-actions a:hover {
  color: var(--clay-dark);
}

.danger-zone {
  border-color: var(--ink);
}

.item-actions .button {
  min-height: 42px;
}

.filter-chip {
  border-radius: 100px;
}

.filter-chip.is-active {
  color: var(--paper);
  background: var(--ink);
}

/* Footer */

.site-footer {
  padding: clamp(5rem, 10vw, 9rem) var(--page-gutter) 2rem;
  color: #f4f1e8;
  background: #1f1e1a;
}

.footer-statement {
  display: grid;
  grid-template-columns: minmax(12rem, 0.35fr) 1fr;
  gap: 3rem;
  width: min(89.5rem, 100%);
  margin: 0 auto clamp(6rem, 12vw, 11rem);
  padding-top: 1rem;
  border-top: 1px solid rgb(244 241 232 / 70%);
}

.footer-statement h2 {
  max-width: 11ch;
  margin: 0;
  font-size: clamp(3rem, 5vw, 5.5rem);
  font-weight: 400;
  line-height: 1.04;
  letter-spacing: -0.035em;
}

.footer-grid,
.footer-meta {
  width: min(89.5rem, 100%);
  margin-inline: auto;
}

.footer-grid {
  grid-template-columns: minmax(20rem, 1.4fr) minmax(9rem, 0.6fr) minmax(12rem, 0.7fr);
  padding-top: 1rem;
  border-top: 1px solid rgb(244 241 232 / 28%);
}

.site-footer .brand,
.site-footer .brand-name,
.footer-grid nav a,
.footer-feeds a {
  color: #f4f1e8;
}

.site-footer .brand-edition {
  color: #bbb6ab;
  border-color: rgb(244 241 232 / 36%);
}

.footer-grid > div:first-child p {
  max-width: 30rem;
  color: #bbb6ab;
}

.footer-grid nav,
.footer-feeds {
  gap: 0.7rem;
}

.footer-grid nav strong,
.footer-feeds strong {
  margin-bottom: 0.5rem;
  color: #f4f1e8;
  font-family: var(--font-sans);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.footer-grid nav a,
.footer-feeds a {
  font-size: 0.9rem;
}

.footer-grid nav a:hover,
.footer-feeds a:hover {
  color: var(--clay);
}

.footer-meta {
  display: flex;
  justify-content: space-between;
  margin-top: 5rem;
  color: #918c82;
  border-color: rgb(244 241 232 / 18%);
}

/* Responsive */

@media (max-width: 1120px) {
  .header-actions {
    gap: 0.65rem;
  }

  .site-nav {
    gap: 0.8rem;
  }

  .site-nav a,
  .account-link,
  .subsite-switcher summary {
    font-size: 0.75rem;
  }

  .workspace-map {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .workspace-map a:nth-child(4n) {
    border-right: 0;
  }

  .workspace-map a:last-child {
    border-right: 1px solid var(--line-strong);
  }
}

@media (max-width: 900px) {
  :root {
    --page-gutter: 1.25rem;
  }

  .header-inner {
    grid-template-columns: 1fr auto;
    padding-block: 0.9rem;
  }

  .nav-toggle {
    display: block;
    border: 1px solid var(--line-strong);
  }

  .site-nav {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0;
    padding: 0;
    border-top: 1px solid var(--ink);
  }

  .site-nav a {
    padding: 0.85rem 0;
    border-bottom: 1px solid var(--line);
  }

  .site-nav a[aria-current="page"] {
    text-underline-offset: 0.2rem;
  }

  .header-actions {
    grid-column: 1 / -1;
    justify-content: space-between;
    padding-top: 0.7rem;
    border-top: 1px solid var(--line);
  }

  .editorial-hero {
    min-height: auto;
  }

  .editorial-hero h1 {
    margin-block: 6rem;
  }

  .manifesto-grid,
  .editorial-heading,
  .index-section > header,
  .hvac-feature__grid,
  .footer-statement {
    grid-template-columns: 1fr;
  }

  .index-note {
    margin-left: 0;
  }

  .practice-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .practice-grid > a {
    min-height: 24rem;
    border-bottom: 1px solid var(--ink);
  }

  .practice-grid > a:nth-child(2n) {
    border-right: 0;
  }

  .catalog-intro {
    grid-template-columns: 1fr;
  }

  .record-card:nth-child(3n),
  .content-card:last-child {
    border-right: 1px solid var(--line-strong);
  }

  .record-card:nth-child(2n),
  .content-card:nth-child(2n) {
    border-right: 0;
  }

  .footer-statement {
    gap: 2rem;
  }
}

@media (max-width: 680px) {
  body {
    font-size: 1rem;
  }

  .brand-edition {
    display: none;
  }

  .hero-kicker,
  .hero-bottom,
  .subscribe-band__inner,
  .footer-meta {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.2rem;
  }

  .hero-kicker span:last-child {
    color: var(--muted);
  }

  .editorial-hero h1 {
    max-width: 9ch;
    margin-block: 3.75rem;
    font-size: clamp(2.85rem, 13vw, 3.7rem);
    line-height: 1.08;
    letter-spacing: -0.025em;
  }

  .manifesto-grid h2,
  .hvac-feature h2,
  .subscribe-band h2,
  .footer-statement h2 {
    font-size: clamp(2.4rem, 10.5vw, 3.45rem);
    line-height: 1.1;
  }

  .practice-grid,
  .workspace-map {
    grid-template-columns: 1fr;
  }

  .practice-grid > a,
  .practice-grid > a:nth-child(2n),
  .workspace-map a,
  .workspace-map a:nth-child(4n),
  .workspace-map a:last-child {
    min-height: 17rem;
    border-right: 0;
  }

  .practice-grid p {
    min-height: auto;
  }

  .workspace-map a {
    min-height: 9rem;
  }

  .parameter-sheet h3 {
    margin-block: 2.5rem;
  }

  .card-grid,
  .record-list,
  .record-list--two,
  .relation-grid,
  .evidence-list,
  .mirror-grid,
  .fact-grid {
    grid-template-columns: 1fr;
  }

  .record-card,
  .record-card:nth-child(2n),
  .record-card:nth-child(3n),
  .content-card,
  .content-card:nth-child(2n),
  .content-card:last-child {
    min-height: 19rem;
    border-right: 0;
  }

  .fact-grid {
    border-left: 0;
  }

  .fact-grid div {
    grid-template-columns: 6rem 1fr;
    border-left: 1px solid var(--line);
  }

  .filter-panel,
  .filter-panel--simple,
  .catalog-search {
    grid-template-columns: 1fr;
  }

  .subscribe-band__inner > div:last-child {
    flex-wrap: wrap;
  }

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

  .footer-grid > div:first-child {
    grid-column: 1 / -1;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}

/* System-wide refinement */

html {
  scroll-padding-top: 6rem;
  scrollbar-color: var(--line-strong) var(--paper);
}

body {
  min-width: 20rem;
  overflow-x: clip;
}

main,
.auth-shell {
  isolation: isolate;
}

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

.site-header {
  transition: border-color 180ms ease, background-color 180ms ease, box-shadow 180ms ease;
}

.site-header.is-scrolled {
  border-bottom-color: var(--line-strong);
  background: color-mix(in srgb, var(--paper) 98%, transparent);
  box-shadow: 0 8px 24px rgb(20 20 19 / 4%);
}

:root[data-theme="dark"] .site-header.is-scrolled {
  box-shadow: 0 8px 24px rgb(0 0 0 / 14%);
}

.nav-toggle {
  min-height: 2.25rem;
  font-size: 0;
}

.nav-toggle > span[aria-hidden="true"] {
  font-size: 1rem;
  line-height: 1;
}

.theme-toggle[aria-pressed="true"] {
  color: var(--clay);
}

.subsite-switcher[open] summary {
  color: var(--clay-dark);
}

.subsite-switcher[open] summary::after {
  content: "⌃";
}

.index-masthead {
  display: grid;
  grid-template-columns: minmax(13rem, 0.42fr) minmax(0, 1fr);
  gap: clamp(3rem, 8vw, 9rem);
  margin-bottom: clamp(4rem, 8vw, 7rem);
  padding: 1rem 0 clamp(3rem, 6vw, 5.5rem);
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
}

.index-masthead .section-title {
  margin: clamp(1.6rem, 4vw, 4rem) 0 0;
}

.index-masthead__aside {
  display: grid;
  align-content: space-between;
  gap: 3rem;
  min-height: 15rem;
  padding-top: clamp(2.6rem, 5vw, 5rem);
}

.index-masthead__aside .lede {
  max-width: 47rem;
  margin: 0;
}

.index-count {
  display: flex;
  gap: 0.7rem;
  align-items: baseline;
  margin: 0;
  color: var(--muted);
  font-family: var(--font-sans);
  font-size: var(--type-ui);
}

.index-count span {
  color: var(--ink);
  font-family: var(--font-serif);
  font-size: clamp(1.75rem, 2.2vw, 2.6rem);
  line-height: 1;
}

.content-index-page .card-grid {
  margin-top: 0;
}

.card-grid > .empty-state,
.record-grid > .empty-state,
.record-list > .empty-state {
  grid-column: 1 / -1;
}

.empty-state > p:not(.eyebrow) {
  max-width: 44rem;
  color: var(--muted);
  line-height: 1.75;
}

.empty-state .text-link {
  margin-top: 1rem;
}

.content-card,
.record-card {
  position: relative;
  box-shadow: inset 0 3px 0 transparent;
}

.content-card:hover,
.record-card:hover {
  box-shadow: inset 0 3px 0 var(--clay);
}

.content-card h2 a,
.record-card h2 a,
.record-card h3 a {
  text-decoration: none;
}

.content-card:hover h2 a,
.record-card:hover h2 a,
.record-card:hover h3 a {
  color: var(--clay-dark);
}

.content-card__meta,
.record-card__head,
.record-facts,
.content-card__foot,
.record-card__foot {
  font-size: var(--type-caption);
  letter-spacing: 0.025em;
}

.record-card__foot,
.content-card__foot {
  margin-top: auto;
}

.page-hero--compact {
  display: grid;
  gap: 1.2rem;
  margin-bottom: clamp(3rem, 7vw, 6rem);
  padding: 1rem 0 clamp(2.75rem, 6vw, 5rem);
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
}

.page-hero--compact h1 {
  margin: clamp(1.5rem, 4vw, 3.5rem) 0 0;
}

.page-hero--compact .lede {
  max-width: 48rem;
  margin: 0;
}

.context-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.5rem;
  align-items: center;
  margin-top: 1.5rem;
  font-family: var(--font-sans);
  font-size: var(--type-ui);
}

.context-links a {
  color: var(--ink);
  text-decoration-color: var(--line-strong);
  text-underline-offset: 0.35em;
}

.context-links a:hover {
  color: var(--clay-dark);
}

.catalog-search {
  margin-bottom: clamp(3rem, 7vw, 6rem);
  padding-block: 1.25rem;
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
}

.catalog-search input {
  min-height: 52px;
  padding-inline: 1rem;
  border-color: var(--line-strong);
  border-radius: 0;
  font-size: 1rem;
}

.catalog-search .button {
  min-height: 52px;
}

.detail-page > .eyebrow,
.catalog-detail > .eyebrow {
  display: block;
  padding-top: 1rem;
  border-top: 1px solid var(--ink);
}

.detail-page > .detail-title,
.catalog-detail > .detail-title {
  margin: clamp(2rem, 5vw, 5rem) 0 1.5rem;
}

.detail-page > .lede,
.catalog-detail > .lede {
  max-width: 52rem;
  margin-bottom: 2rem;
}

.detail-page > .item-actions,
.catalog-detail > .item-actions {
  padding-block: 1rem;
  border-top: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line-strong);
}

.detail-page > .prose {
  margin-top: clamp(4rem, 8vw, 7rem);
}

.record-code--large {
  margin: clamp(2.5rem, 5vw, 4.5rem) 0 -1.5rem;
  font-size: clamp(1rem, 1vw + 0.8rem, 1.4rem);
  letter-spacing: 0.06em;
}

.record-copy {
  max-width: 58rem;
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--line-strong);
}

.record-copy h2,
.record-copy h3 {
  font-size: var(--type-card-title);
}

.record-copy p {
  color: var(--muted);
  line-height: 1.82;
}

.boundary-note {
  max-width: 58rem;
  line-height: 1.72;
}

.fact-grid dt,
.record-facts,
.catalog-summary,
.version-list small,
.mirror-grid small {
  font-family: var(--font-sans);
}

.fact-grid dd,
.version-list p,
.evidence-list p,
.mirror-grid p {
  line-height: 1.7;
}

.filter-panel input,
.filter-panel select,
.auth-panel input,
.auth-panel textarea,
.auth-panel select,
.feedback-panel select,
.feedback-panel textarea,
.account-panel input,
.account-panel textarea,
.account-panel select {
  min-height: 48px;
  font-size: 1rem;
}

.filter-panel .button {
  min-height: 48px;
}

.filter-panel label > span {
  font-size: var(--type-caption);
  letter-spacing: 0.04em;
}

.account-dashboard {
  display: grid;
  grid-template-columns: minmax(18rem, 0.8fr) minmax(0, 1.2fr);
  gap: clamp(3rem, 8vw, 8rem);
  margin-bottom: clamp(5rem, 10vw, 9rem);
}

.account-dashboard > section {
  padding-top: 1rem;
  border-top: 1px solid var(--ink);
}

.account-facts,
.account-actions {
  max-width: none;
  margin-top: 2rem;
}

.account-facts div {
  padding-block: 0.85rem;
}

.account-actions {
  gap: 0;
  border-top: 1px solid var(--line-strong);
}

.account-actions a {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding-block: 0.85rem;
  color: var(--ink);
  border-bottom: 1px solid var(--line-strong);
  font-family: var(--font-sans);
  text-decoration: none;
}

.account-actions a:hover {
  padding-left: 0.5rem;
  color: var(--clay-dark);
}

.danger-zone {
  grid-template-columns: minmax(16rem, 1fr) repeat(3, auto);
  gap: 1rem;
  align-items: end;
  max-width: none;
  padding-block: 1.5rem;
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
}

.danger-zone > div p:last-child {
  max-width: 28rem;
  margin-bottom: 0;
  color: var(--muted);
  font-size: var(--type-ui);
}

.danger-zone h2 {
  margin: 0.5rem 0;
  font-size: clamp(1.8rem, 2.5vw, 2.8rem);
}

.danger-zone form {
  margin: 0;
}

.danger-zone button,
.auth-panel button {
  border: 1px solid var(--ink);
}

.danger-zone .button--ghost {
  color: var(--ink);
  background: transparent;
}

.danger-zone .button--ghost:hover {
  color: var(--paper);
  background: var(--ink);
}

.button--danger,
.danger-zone .button--danger {
  color: #fff;
  border-color: #8c2f24;
  background: #8c2f24;
}

.button--danger:hover,
.danger-zone .button--danger:hover {
  border-color: #6f2119;
  background: #6f2119;
}

.account-page .page-hero--compact {
  margin-bottom: clamp(3rem, 7vw, 6rem);
}

.saved-section + .saved-section {
  margin-top: clamp(4rem, 8vw, 7rem);
}

.notification-grid .record-card {
  min-height: 18rem;
}

.record-card--unread {
  box-shadow: inset 0 3px 0 var(--clay);
}

.preference-form {
  max-width: 48rem;
}

.preference-form > p,
.auth-panel form > p {
  display: grid;
  gap: 0.5rem;
}

.preference-form label,
.auth-panel label {
  font-family: var(--font-sans);
  font-size: var(--type-ui);
  font-weight: 600;
}

.auth-layout .auth-shell {
  width: min(48rem, calc(100% - (var(--page-gutter) * 2)));
  padding-block: clamp(4rem, 9vw, 8rem);
}

.auth-layout .auth-panel {
  position: relative;
  padding: clamp(2rem, 5vw, 4.5rem);
  overflow: hidden;
}

.auth-layout .auth-panel::before {
  position: absolute;
  top: 0;
  right: 0;
  left: 0;
  height: 4px;
  background: var(--clay);
  content: "";
}

.auth-panel .auth-title,
.auth-panel h1 {
  margin: 1.5rem 0;
  font-size: clamp(2.6rem, 5.5vw, 4.8rem);
  line-height: 1.08;
  letter-spacing: -0.03em;
}

.auth-panel input,
.auth-panel textarea,
.auth-panel select {
  width: 100%;
  padding: 0.75rem;
}

.auth-panel ul.errorlist {
  padding: 0.75rem 1rem;
  color: #8c2f24;
  border-left: 2px solid #8c2f24;
  background: color-mix(in srgb, #8c2f24 8%, transparent);
  list-style: none;
}

.auth-panel .helptext,
.auth-panel form + p {
  color: var(--muted);
  font-size: var(--type-ui);
}

.error-page {
  grid-template-columns: minmax(0, 1.2fr) minmax(20rem, 0.8fr);
  gap: clamp(3rem, 8vw, 9rem);
  align-items: center;
  justify-items: stretch;
  min-height: calc(100vh - 80px);
  padding-block: clamp(5rem, 10vw, 9rem);
}

.error-code {
  margin: 0;
  color: var(--clay);
  font-family: var(--font-serif);
  font-size: clamp(8rem, 21vw, 20rem);
  font-weight: 400;
  line-height: 0.75;
  letter-spacing: -0.08em;
}

.error-copy {
  padding-top: 1rem;
  border-top: 1px solid var(--ink);
}

.error-copy h1 {
  margin: 2rem 0 1rem;
  font-size: clamp(2.6rem, 4.8vw, 4.8rem);
  line-height: 1.08;
}

.error-copy .text-link {
  margin-top: 1.5rem;
}

@media (max-width: 900px) {
  .index-masthead,
  .account-dashboard,
  .error-page {
    grid-template-columns: 1fr;
  }

  .index-masthead {
    gap: 1rem;
  }

  .index-masthead__aside {
    min-height: auto;
    padding-top: 0;
  }

  .danger-zone {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    align-items: stretch;
  }

  .danger-zone > div {
    grid-column: 1 / -1;
  }

  .danger-zone .button {
    width: 100%;
    height: 100%;
  }

  .error-page {
    gap: 4rem;
    align-content: center;
  }

  .error-code {
    font-size: clamp(8rem, 38vw, 15rem);
  }
}

@media (max-width: 680px) {
  .site-header.is-scrolled {
    box-shadow: none;
  }

  .index-masthead {
    margin-bottom: 3.5rem;
    padding-bottom: 2.5rem;
  }

  .index-masthead .section-title {
    margin-top: 1.5rem;
  }

  .index-masthead__aside {
    gap: 2rem;
  }

  .page-hero--compact h1 {
    font-size: clamp(2.8rem, 13vw, 4rem);
  }

  .context-links {
    gap: 0.65rem 1.1rem;
  }

  .catalog-search {
    grid-template-columns: 1fr;
  }

  .catalog-search .button {
    width: 100%;
  }

  .detail-page > .detail-title,
  .catalog-detail > .detail-title {
    margin-top: 2.5rem;
  }

  .danger-zone {
    grid-template-columns: 1fr;
  }

  .danger-zone > div {
    grid-column: auto;
  }

  .account-facts div {
    grid-template-columns: 5.5rem minmax(0, 1fr);
  }

  .auth-layout .auth-panel {
    padding: 2rem 1.25rem;
  }

  .error-page {
    gap: 3rem;
  }

  .error-code {
    font-size: clamp(7rem, 45vw, 11rem);
  }
}
.content-breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: .45rem;
  align-items: center;
  margin: 0 0 2rem;
  color: var(--color-muted, #6b675f);
  font-size: .78rem;
}
.content-breadcrumbs a { color: inherit; text-decoration-thickness: 1px; text-underline-offset: .2em; }
.content-breadcrumbs [aria-current="page"] { overflow: hidden; max-width: 28rem; color: var(--color-ink, #181815); text-overflow: ellipsis; white-space: nowrap; }