/* Hallmark · macrostructure: Narrative Workflow · genre: editorial · theme: Newsprint · tone: analytical business editorial · anchor hue: signal orange · enrichment: Tier-A CSS dual-flow · nav: N6 · footer: Ft5 · contrast: pass (40–41) · slop: pass (42–45) · honest: pass (46) · chrome: pass (47) · tokens: pass (48) · responsive: pass (49) · icons: pass (30) · mobile: pass (34, 49–57) */
/* Hallmark · pre-emit critique: P5 H4 E4 S5 R5 V5 */
@import url("https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:wght@500;600&family=IBM+Plex+Sans:wght@400;600;700&family=Newsreader:opsz,wght@6..72,600;6..72,800&display=swap");
@import url("tokens.css");

html,
body {
  overflow-x: clip;
}

html {
  color-scheme: light dark;
  scroll-behavior: smooth;
}

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

body {
  margin: 0;
  background: var(--color-paper);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.7;
  text-rendering: optimizeLegibility;
}

a {
  color: var(--color-accent-ink);
  text-decoration-color: var(--color-accent);
  text-decoration-thickness: var(--rule-hair);
  text-underline-offset: var(--space-3xs);
}

a:hover {
  text-decoration-thickness: var(--rule-medium);
}

a:focus-visible,
button:focus-visible,
[tabindex]:focus-visible {
  outline: var(--rule-thick) solid var(--color-focus);
  outline-offset: var(--space-2xs);
}

button {
  font: inherit;
}

.skip-link {
  position: fixed;
  inset-block-start: var(--space-sm);
  inset-inline-start: var(--space-sm);
  z-index: 600;
  padding: var(--space-sm) var(--space-md);
  background: var(--color-ink);
  color: var(--color-paper);
  transform: translateY(-200%);
}

.skip-link:focus {
  transform: none;
}

.masthead {
  width: min(100% - 2rem, 76rem);
  margin-inline: auto;
  padding-block: var(--space-md) 0;
  text-align: center;
}

.masthead__issue {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-xs) var(--space-md);
  margin: 0;
  color: var(--color-muted);
  font-family: var(--font-outlier);
  font-size: var(--text-xs);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.masthead__name {
  margin: var(--space-xs) 0 0;
  font-family: var(--font-display);
  font-size: clamp(2.25rem, 6vw, 4rem);
  font-style: normal;
  font-weight: 800;
  letter-spacing: -0.035em;
  line-height: 0.95;
  overflow-wrap: anywhere;
  min-width: 0;
}

.masthead__nav {
  margin-block-start: var(--space-sm);
}

.masthead__nav ul {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-xs) var(--space-lg);
  margin: 0;
  padding: 0;
  list-style: none;
}

.masthead__nav a,
.theme-toggle {
  display: inline-flex;
  min-height: 2.75rem;
  align-items: center;
  justify-content: center;
  border: 0;
  border-bottom: var(--rule-hair) solid transparent;
  background: transparent;
  color: var(--color-ink-2);
  font-size: var(--text-sm);
  font-weight: 600;
  line-height: 1;
  text-decoration: none;
  white-space: nowrap;
  cursor: pointer;
}

.masthead__nav a:hover,
.masthead__nav a[aria-current="page"],
.theme-toggle:hover {
  border-bottom-color: var(--color-accent);
  color: var(--color-ink);
}

.masthead__nav a:active,
.theme-toggle:active {
  background: var(--color-accent-soft);
}

.theme-toggle[disabled],
.theme-toggle[aria-busy="true"] {
  cursor: wait;
  opacity: 0.55;
}

.theme-toggle[data-state="error"] {
  color: var(--color-danger);
}

.theme-toggle[data-state="success"] {
  color: var(--color-success);
}

.masthead__rule {
  height: var(--space-2xs);
  margin: var(--space-xs) 0 0;
  border: 0;
  border-block: var(--rule-hair) solid var(--color-rule-strong);
}

.reading-path {
  width: min(100% - 2rem, 76rem);
  margin: var(--space-md) auto 0;
  padding-block-end: var(--space-sm);
  border-bottom: var(--rule-hair) solid var(--color-rule);
}

.reading-path ol {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--space-xs);
  margin: 0;
  padding: 0;
  list-style: none;
}

.reading-path a {
  display: grid;
  min-height: 3.4rem;
  align-content: center;
  gap: var(--space-3xs);
  padding-inline: var(--space-sm);
  border-inline-start: var(--rule-hair) solid var(--color-rule);
  color: var(--color-muted);
  text-decoration: none;
}

.reading-path a[aria-current="step"] {
  border-inline-start: var(--rule-thick) solid var(--color-accent);
  color: var(--color-ink);
}

.path-number {
  color: var(--color-accent);
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-variant-numeric: tabular-nums;
}

.path-label {
  font-size: var(--text-sm);
  font-weight: 600;
  white-space: nowrap;
}

.page-shell {
  width: min(100% - 2rem, 72rem);
  margin-inline: auto;
  padding-block: var(--space-xl) var(--space-3xl);
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  margin: 0 0 var(--space-xl);
  color: var(--color-muted);
  font-size: var(--text-sm);
}

.breadcrumb a,
.breadcrumb span {
  white-space: nowrap;
}

.hero {
  display: grid;
  gap: var(--space-xl);
  align-items: center;
  padding-block-end: var(--space-2xl);
  border-bottom: var(--rule-thick) solid var(--color-rule-strong);
}

.hero__copy {
  min-width: 0;
}

.hero h1 {
  max-width: 10ch;
  margin: 0;
  font-family: var(--font-display);
  font-size: var(--text-display);
  font-style: normal;
  font-weight: 800;
  letter-spacing: -0.045em;
  line-height: 0.98;
  overflow-wrap: anywhere;
  min-width: 0;
}

.hero__lede {
  max-width: 65ch;
  margin: var(--space-lg) 0 0;
  color: var(--color-ink-2);
  font-family: var(--font-display);
  font-size: var(--text-md);
  font-weight: 600;
  line-height: 1.55;
}

.hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs) var(--space-lg);
  margin: var(--space-lg) 0 0;
  color: var(--color-muted);
  font-family: var(--font-body);
  font-size: var(--text-xs);
}

.signal-board {
  margin: 0;
  padding: var(--space-lg);
  border-block: var(--rule-hair) solid var(--color-rule-strong);
  background: var(--color-paper-2);
}

.signal-board__row {
  display: grid;
  grid-template-columns: 4.5rem minmax(0, 1fr);
  gap: var(--space-sm);
  align-items: center;
  padding-block: var(--space-sm);
}

.signal-board__row + .signal-board__row {
  border-top: var(--rule-hair) solid var(--color-rule);
}

.signal-board__label {
  color: var(--color-muted);
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 600;
}

.flow-line {
  display: grid;
  grid-template-columns: repeat(7, minmax(0, auto));
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2xs);
  margin: 0;
  padding: 0;
  list-style: none;
}

.flow-line li {
  font-size: var(--text-sm);
  font-weight: 700;
  white-space: nowrap;
}

.flow-line .arrow {
  color: var(--color-accent);
  font-family: var(--font-body);
}

.signal-bars {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: var(--space-sm);
  height: 5.5rem;
  margin-block-start: var(--space-md);
  padding-block-start: var(--space-sm);
  border-top: var(--rule-hair) solid var(--color-rule);
}

.signal-bars span {
  display: grid;
  width: 18%;
  align-items: end;
  justify-content: center;
  border-top: var(--rule-thick) solid var(--color-accent);
  background: var(--color-accent-soft);
  color: var(--color-accent-ink);
  font-family: var(--font-body);
  font-size: var(--text-xs);
}

.signal-bars span:nth-child(1) { height: 28%; }
.signal-bars span:nth-child(2) { height: 38%; }
.signal-bars span:nth-child(3) { height: 55%; }
.signal-bars span:nth-child(4) { height: 82%; }

.signal-board figcaption {
  margin-block-start: var(--space-md);
  color: var(--color-muted);
  font-size: var(--text-sm);
  line-height: 1.55;
}

.article-grid {
  display: grid;
  gap: var(--space-xl);
  padding-block-start: var(--space-2xl);
}

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

.article-body section {
  padding-block: 0 var(--space-2xl);
}

.article-body section + section {
  padding-block-start: var(--space-xl);
  border-top: var(--rule-hair) solid var(--color-rule);
}

.stage-heading {
  display: grid;
  gap: var(--space-xs);
  margin-block-end: var(--space-lg);
}

.stage-heading__number {
  color: var(--color-accent);
  font-family: var(--font-outlier);
  font-size: var(--text-sm);
  font-variant-numeric: tabular-nums;
  font-weight: 600;
}

h2,
h3 {
  margin: 0;
  color: var(--color-ink);
  font-family: var(--font-display);
  font-style: normal;
  overflow-wrap: anywhere;
  min-width: 0;
}

h2 {
  max-width: 22ch;
  font-size: clamp(1.85rem, 4vw, 3rem);
  font-weight: 800;
  letter-spacing: -0.035em;
  line-height: 1.08;
}

h3 {
  margin-block: var(--space-xl) var(--space-sm);
  font-size: var(--text-lg);
  font-weight: 800;
  line-height: 1.2;
}

.article-body p,
.reference-copy p {
  max-width: 68ch;
  margin: 0 0 var(--space-md);
  color: var(--color-ink-2);
}

.article-body p:first-of-type {
  color: var(--color-ink);
  font-size: var(--text-md);
  line-height: 1.65;
}

.article-body dfn {
  color: var(--color-ink);
  font-style: normal;
  font-weight: 700;
  text-decoration: underline;
  text-decoration-color: var(--color-accent);
  text-decoration-thickness: var(--rule-medium);
  text-underline-offset: var(--space-3xs);
}

.margin-note {
  padding-block: var(--space-md);
  border-block: var(--rule-hair) solid var(--color-rule);
  color: var(--color-muted);
  font-size: var(--text-sm);
}

.margin-note strong {
  display: block;
  margin-block-end: var(--space-xs);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--text-xs);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.case-ledger {
  margin-block: var(--space-xl);
  padding: var(--space-lg);
  background: var(--color-paper-2);
  box-shadow: inset 0 0 0 var(--rule-hair) var(--color-rule);
}

.case-ledger h3 {
  margin-block-start: 0;
}

.case-ledger p:last-child {
  margin-block-end: 0;
}

.mechanism-list,
.diagnostic-list,
.source-list {
  margin: var(--space-lg) 0;
  padding: 0;
  list-style: none;
}

.mechanism-list li,
.diagnostic-list li,
.source-list li {
  padding-block: var(--space-lg);
  border-top: var(--rule-hair) solid var(--color-rule);
}

.mechanism-list li:last-child,
.diagnostic-list li:last-child,
.source-list li:last-child {
  border-bottom: var(--rule-hair) solid var(--color-rule);
}

.mechanism-list h3,
.diagnostic-list h3,
.source-list h3 {
  margin-block: 0 var(--space-xs);
}

.mechanism-list p,
.diagnostic-list p,
.source-list p {
  margin-block-end: 0;
}

.table-wrap {
  max-width: 100%;
  margin-block: var(--space-xl);
  overflow-x: auto;
  border-block: var(--rule-thick) solid var(--color-rule-strong);
}

table {
  width: 100%;
  min-width: 42rem;
  border-collapse: collapse;
  font-size: var(--text-sm);
}

th,
td {
  padding: var(--space-sm) var(--space-md);
  border-bottom: var(--rule-hair) solid var(--color-rule);
  text-align: start;
  vertical-align: top;
}

th {
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.04em;
}

td {
  color: var(--color-ink-2);
}

.chapter-turn {
  display: grid;
  gap: var(--space-sm);
  margin-block-start: var(--space-xl);
  padding-block-start: var(--space-lg);
  border-top: var(--rule-thick) solid var(--color-rule-strong);
}

.chapter-turn p {
  margin: 0;
  color: var(--color-ink);
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 800;
  line-height: 1.35;
}

.chapter-turn a {
  width: fit-content;
  font-weight: 700;
  white-space: nowrap;
}

.reference-copy h2 {
  margin-block: var(--space-2xl) var(--space-lg);
}

.source-meta {
  color: var(--color-muted);
  font-family: var(--font-body);
  font-size: var(--text-xs);
}

.foot-statement {
  width: min(100% - 2rem, 76rem);
  margin-inline: auto;
  padding-block: var(--space-2xl) var(--space-xl);
  border-top: var(--rule-thick) solid var(--color-rule-strong);
}

.foot-statement__line {
  max-width: 26ch;
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4vw, 3.25rem);
  font-style: normal;
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.05;
  overflow-wrap: anywhere;
  min-width: 0;
}

.foot-statement__meta {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--space-sm) var(--space-lg);
  margin-block-start: var(--space-xl);
  padding-block-start: var(--space-sm);
  border-top: var(--rule-hair) solid var(--color-rule);
  color: var(--color-muted);
  font-size: var(--text-sm);
}

.foot-statement__meta a {
  white-space: nowrap;
}

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

@media (min-width: 42rem) {
  .page-shell,
  .masthead,
  .reading-path,
  .foot-statement {
    width: min(100% - 3rem, 76rem);
  }

  .hero {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  }

  .article-grid {
    grid-template-columns: minmax(0, 1fr) 12rem;
    align-items: start;
  }

  .article-aside {
    position: sticky;
    inset-block-start: var(--space-lg);
  }
}

@media (max-width: 41.99rem) {
  .masthead__nav ul {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0 var(--space-xs);
  }

  .masthead__nav li {
    min-width: 0;
  }

  .masthead__nav a,
  .theme-toggle {
    width: 100%;
  }

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

  .signal-board {
    padding: var(--space-md);
  }

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

  .flow-line {
    grid-template-columns: repeat(4, minmax(0, auto));
  }

  .flow-line .arrow {
    display: none;
  }

  .article-aside {
    order: -1;
  }
}

@media (max-width: 23.5rem) {
  .masthead__nav a,
  .theme-toggle {
    min-height: 3rem;
    font-size: var(--text-xs);
  }

  .path-label {
    font-size: var(--text-xs);
  }

  .page-shell {
    width: min(100% - 1.25rem, 72rem);
  }

  .hero h1 {
    max-width: none;
    font-size: var(--text-2xl);
  }
}

@media (pointer: coarse) {
  .masthead__nav a,
  .theme-toggle,
  .chapter-turn a {
    min-height: 3rem;
  }
}

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

@media print {
  .skip-link,
  .theme-toggle,
  .reading-path {
    display: none;
  }

  body {
    background: var(--color-panel);
    color: var(--color-ink);
  }

  a {
    color: var(--color-ink);
  }
}