/* Hallmark · macrostructure: Long Document · tone: analytical business editorial · anchor hue: ocean blue · genre: editorial · theme: Editorial · enrichment: Tier-B hand SVG · nav: N9 · footer: Ft2
 * contrast: pass (40–41) · slop: 58/58 pass · honest: pass (46) · chrome: pass (47) · tokens: pass (48)
 * responsive: pass (34, 49, 50–57) · viewports: 320 / 375 / 414 / 768 / 1280 · icons: pass (30)
 */
/* Hallmark · pre-emit critique: P5 H5 E5 S5 R5 V5 */
@import url("tokens.css");

html,
body {
  overflow-x: clip;
}

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

html[data-theme="dark"] {
  color-scheme: dark;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-width: 20rem;
  background: var(--color-paper);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.75;
  text-rendering: optimizeLegibility;
}

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

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

a:active {
  color: var(--color-rival);
}

a:focus-visible,
button:focus-visible,
summary:focus-visible {
  outline: 3px solid var(--color-focus);
  outline-offset: 3px;
}

[aria-disabled="true"],
button:disabled {
  cursor: not-allowed;
  opacity: 0.52;
}

[data-state="loading"] {
  cursor: wait;
  opacity: 0.68;
}

[data-state="error"] {
  border-color: var(--color-rival);
}

[data-state="success"] {
  border-color: var(--color-positive);
}

.skip-link {
  position: fixed;
  inset-block-start: var(--space-sm);
  inset-inline-start: var(--space-sm);
  z-index: var(--z-tooltip);
  padding: var(--space-xs) var(--space-sm);
  background: var(--color-ink);
  color: var(--color-paper);
  transform: translateY(-180%);
}

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

.nav-shell {
  position: relative;
  z-index: var(--z-sticky);
  border-block-end: var(--rule-thin) solid var(--color-rule);
  background: var(--color-paper);
}

.nav-edge {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: min(100% - var(--space-xl), var(--content-wide));
  min-height: 4.25rem;
  margin-inline: auto;
  gap: var(--space-md);
}

.site-home {
  color: var(--color-ink);
  font-family: var(--font-display);
  font-size: var(--text-md);
  font-style: normal;
  font-weight: 700;
  letter-spacing: -0.02em;
  text-decoration: none;
  white-space: nowrap;
}

.reading-nav {
  position: relative;
}

.reading-nav summary,
.theme-toggle {
  min-height: 2.75rem;
  border: var(--rule-thin) solid var(--color-rule-strong);
  border-radius: var(--radius-control);
  background: var(--color-clear);
  color: var(--color-ink);
  font: inherit;
  font-weight: 700;
  line-height: 1;
  white-space: nowrap;
}

.reading-nav summary {
  display: grid;
  place-items: center;
  padding-inline: var(--space-md);
  cursor: pointer;
  list-style: none;
}

.reading-nav summary::-webkit-details-marker {
  display: none;
}

.reading-nav summary:hover,
.theme-toggle:hover {
  background: var(--color-paper-2);
}

.reading-nav summary:active,
.theme-toggle:active {
  transform: translateY(1px);
}

.reading-menu {
  position: absolute;
  inset-block-start: calc(100% + var(--space-xs));
  inset-inline-end: 0;
  z-index: var(--z-dropdown);
  width: min(20rem, calc(100vw - var(--space-xl)));
  padding: var(--space-md);
  border: var(--rule-thin) solid var(--color-rule-strong);
  border-radius: var(--radius-panel);
  background: var(--color-paper);
  box-shadow: 0 var(--space-xs) var(--space-xl) var(--color-shadow);
}

.reading-menu ul {
  display: grid;
  gap: var(--space-2xs);
  margin: 0;
  padding: 0;
  list-style: none;
}

.reading-menu a {
  display: block;
  min-height: 2.75rem;
  padding: var(--space-xs) var(--space-sm);
  color: var(--color-ink);
  text-decoration: none;
  white-space: nowrap;
}

.reading-menu a:hover,
.reading-menu a[aria-current="page"] {
  background: var(--color-accent-soft);
  color: var(--color-accent);
}

.menu-tools {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-sm);
  margin-block-start: var(--space-sm);
  padding-block-start: var(--space-sm);
  border-block-start: var(--rule-thin) solid var(--color-rule);
}

.menu-tools a {
  min-height: auto;
  padding: 0;
  color: var(--color-muted);
  font-size: var(--text-sm);
}

.theme-toggle {
  padding-inline: var(--space-sm);
  cursor: pointer;
}

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

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

.breadcrumb.page-shell {
  padding-block: var(--space-xl) 0;
}

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

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

.hero-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-xl);
  align-items: center;
  padding-block-end: var(--space-2xl);
  border-block-end: var(--rule-heavy) solid var(--color-ink);
}

.hero-copy,
.hero-figure {
  min-width: 0;
}

.kicker {
  margin: 0 0 var(--space-sm);
  color: var(--color-accent);
  font-size: var(--text-sm);
  font-weight: 800;
  letter-spacing: 0.08em;
}

h1,
h2,
h3 {
  margin: 0;
  color: var(--color-ink);
  font-family: var(--font-display);
  font-style: normal;
  overflow-wrap: anywhere;
  min-width: 0;
}

h1 {
  max-width: 12ch;
  font-size: var(--text-display-s);
  font-weight: 800;
  letter-spacing: -0.045em;
  line-height: 1.08;
}

h2 {
  margin-block: var(--space-2xl) var(--space-md);
  font-size: var(--text-xl);
  font-weight: 800;
  letter-spacing: -0.025em;
  line-height: 1.18;
}

h3 {
  margin-block: var(--space-xl) var(--space-sm);
  font-size: var(--text-lg);
  font-weight: 800;
  line-height: 1.25;
}

.lede {
  max-width: 54ch;
  margin: var(--space-lg) 0 0;
  color: var(--color-ink-soft);
  font-size: var(--text-md);
  line-height: 1.65;
}

.reading-progress {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: var(--space-sm);
  align-items: center;
  margin-block-start: var(--space-lg);
  color: var(--color-muted);
  font-size: var(--text-sm);
}

.progress-track {
  height: var(--rule-heavy);
  background: var(--color-rule);
}

.progress-fill {
  display: block;
  height: 100%;
  background: var(--color-accent);
}

.progress-1 { width: 33.333%; }
.progress-2 { width: 66.666%; }
.progress-3 { width: 100%; }

.hero-figure {
  margin: 0;
  padding: var(--space-md) 0 0;
}

.hero-figure svg {
  display: block;
  width: 100%;
  height: auto;
  color: var(--color-ink);
}

.hero-figure figcaption {
  margin-block-start: var(--space-sm);
  color: var(--color-muted);
  font-size: var(--text-sm);
  line-height: 1.6;
}

.chart-axis,
.chart-grid {
  fill: none;
  stroke: var(--color-rule);
  stroke-width: 1.5;
}

.chart-axis {
  stroke: var(--color-rule-strong);
  stroke-width: 2;
}

.chart-rival,
.chart-ocean {
  fill: none;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 5;
}

.chart-rival { stroke: var(--color-rival); }
.chart-ocean { stroke: var(--color-accent); }
.chart-dot-rival { fill: var(--color-rival); }
.chart-dot-ocean { fill: var(--color-accent); }
.chart-label { fill: var(--color-muted); font-family: var(--font-body); font-size: 13px; }
.chart-key { fill: var(--color-ink); font-family: var(--font-body); font-size: 14px; font-weight: 700; }

.prose {
  max-width: var(--measure);
  margin-inline: auto;
  padding-block-start: var(--space-xl);
}

.prose p {
  margin: 0 0 var(--space-lg);
}

.prose p + p {
  text-wrap: pretty;
}

.prose dfn,
.hero-copy dfn {
  border-block-end: var(--rule-heavy) solid var(--color-accent);
  color: var(--color-ink);
  font-style: normal;
  font-weight: 750;
}

.lead-drop::first-letter {
  float: inline-start;
  margin-inline-end: var(--space-xs);
  color: var(--color-accent);
  font-family: var(--font-display);
  font-size: 4.5rem;
  font-weight: 800;
  line-height: 0.84;
}

.field-note {
  margin-block: var(--space-2xl);
  padding-block: var(--space-lg);
  border-block: var(--rule-thin) solid var(--color-rule-strong);
  color: var(--color-ink-soft);
}

.field-note strong {
  display: block;
  margin-block-end: var(--space-xs);
  color: var(--color-ink);
  font-family: var(--font-display);
  font-size: var(--text-md);
}

blockquote {
  margin: var(--space-2xl) 0;
  padding-inline-start: var(--space-lg);
  border-inline-start: var(--rule-heavy) solid var(--color-accent);
  color: var(--color-ink-soft);
  font-family: var(--font-display);
  font-size: var(--text-md);
  font-style: normal;
  line-height: 1.65;
}

.plain-list,
.case-trace,
.decision-gates,
.source-list {
  margin: var(--space-lg) 0 var(--space-2xl);
  padding: 0;
  list-style: none;
}

.plain-list li,
.case-trace li,
.decision-gates li,
.source-list li {
  padding-block: var(--space-md);
  border-block-end: var(--rule-thin) solid var(--color-rule);
}

.plain-list strong,
.case-trace strong,
.decision-gates strong {
  color: var(--color-ink);
}

.case-trace {
  counter-reset: trace;
}

.case-trace li {
  display: grid;
  grid-template-columns: 2.5rem minmax(0, 1fr);
  gap: var(--space-sm);
  counter-increment: trace;
}

.case-trace li::before {
  content: counter(trace, decimal-leading-zero);
  color: var(--color-accent);
  font-weight: 800;
  font-variant-numeric: tabular-nums;
}

.spec-sheet {
  width: 100%;
  margin-block: var(--space-lg) var(--space-2xl);
  border-collapse: collapse;
  font-variant-numeric: tabular-nums;
}

.spec-sheet thead {
  display: none;
}

.spec-sheet tr,
.spec-sheet th,
.spec-sheet td {
  display: block;
}

.spec-sheet tr {
  padding-block: var(--space-md);
  border-block-end: var(--rule-thin) solid var(--color-rule);
}

.spec-sheet th,
.spec-sheet td {
  padding-block: var(--space-2xs);
  text-align: start;
  vertical-align: top;
}

.spec-sheet th {
  color: var(--color-accent);
  font-size: var(--text-sm);
}

.spec-sheet td::before {
  content: attr(data-label);
  display: block;
  color: var(--color-muted);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.06em;
}

.spec-sheet .muted {
  color: var(--color-muted);
}

.equation {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-sm);
  margin-block: var(--space-xl) var(--space-2xl);
  padding-block: var(--space-lg);
  border-block: var(--rule-heavy) solid var(--color-ink);
  text-align: center;
}

.equation span {
  color: var(--color-muted);
  font-size: var(--text-sm);
}

.equation strong {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 800;
}

.source-list h3 {
  margin: 0 0 var(--space-xs);
  font-size: var(--text-md);
}

.source-list p {
  margin: 0 0 var(--space-xs);
}

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

.page-turn {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-sm);
  max-width: var(--measure);
  margin: var(--space-3xl) auto 0;
  padding-block-start: var(--space-lg);
  border-block-start: var(--rule-heavy) solid var(--color-ink);
}

.page-turn a {
  display: inline-flex;
  align-items: center;
  min-height: 2.75rem;
  width: fit-content;
  color: var(--color-ink);
  font-weight: 800;
  text-decoration: none;
  white-space: nowrap;
}

.page-turn a:hover {
  color: var(--color-accent);
  text-decoration: underline;
  text-decoration-thickness: var(--rule-heavy);
  text-underline-offset: var(--space-3xs);
}

.foot-line {
  width: min(100% - var(--space-xl), var(--content-wide));
  margin-inline: auto;
  padding-block: var(--space-lg) var(--space-xl);
  border-block-start: var(--rule-thin) solid var(--color-rule);
  color: var(--color-muted);
  font-size: var(--text-sm);
}

.foot-line p {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs) var(--space-lg);
  justify-content: space-between;
  margin: 0;
}

.foot-line a {
  color: var(--color-muted);
  white-space: nowrap;
}

@media (min-width: 40rem) {
  .page-shell {
    width: min(100% - var(--space-2xl), var(--content-wide));
    padding-block-start: var(--space-2xl);
  }

  .nav-edge,
  .foot-line {
    width: min(100% - var(--space-2xl), var(--content-wide));
  }

  .spec-sheet thead {
    display: table-header-group;
  }

  .spec-sheet tr {
    display: table-row;
    padding: 0;
  }

  .spec-sheet th,
  .spec-sheet td {
    display: table-cell;
    padding: var(--space-md) var(--space-sm);
  }

  .spec-sheet th:first-child,
  .spec-sheet td:first-child {
    padding-inline-start: 0;
  }

  .spec-sheet th:last-child,
  .spec-sheet td:last-child {
    padding-inline-end: 0;
  }

  .spec-sheet td::before {
    display: none;
  }

  .equation {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: center;
    text-align: start;
  }

  .page-turn {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }

  .page-turn a:last-child {
    justify-self: end;
  }
}

@media (min-width: 60rem) {
  .hero-split {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: var(--space-2xl);
  }

  .hero-figure {
    padding-block-start: 0;
  }

  .prose {
    padding-block-start: var(--space-2xl);
  }
}

@media (pointer: coarse) {
  .reading-nav summary,
  .theme-toggle,
  .reading-menu a,
  .page-turn a {
    min-height: 3rem;
  }
}

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

  *,
  *::before,
  *::after {
    animation-duration: 150ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 150ms !important;
  }
}

@media print {
  .nav-shell,
  .page-turn,
  .foot-line,
  .skip-link {
    display: none;
  }

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

  .page-shell {
    width: 100%;
    padding: 0;
  }
}