/* Hallmark · macrostructure: Long Document · genre: editorial-reference · tone: technical · theme: Almanac · anchor hue: cobalt · nav: N3 · footer: Ft1 */
/* Hallmark · contrast: pass (40–41) · slop: pass (42–45) · honest: pass (46) · chrome: pass (47) · tokens: pass (48) · responsive: pass (49) · mobile: pass (34,49,50–57) */
/* Hallmark · pre-emit critique: P5 H4 E4 S5 R5 V4 */
@import url("tokens.css");

html,
body {
  overflow-x: clip;
}

html {
  scroll-behavior: smooth;
}

* {
  box-sizing: border-box;
}

body {
  min-width: 0;
  margin: 0;
  background: var(--color-paper);
  color: var(--color-ink-2);
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.72;
  text-rendering: optimizeLegibility;
}

a {
  color: var(--color-accent);
  text-decoration-thickness: var(--rule-thin);
  text-underline-offset: 0.18em;
}

a:active { color: var(--color-ink); }
a[aria-disabled="true"] {
  cursor: not-allowed;
  opacity: 0.55;
  pointer-events: none;
}

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

button {
  font-family: var(--font-body);
}

.skip-link {
  position: fixed;
  inset-block-start: var(--space-sm);
  inset-inline-start: var(--space-sm);
  z-index: var(--z-sticky);
  transform: translateY(-180%);
  padding: var(--space-sm) var(--space-md);
  border: var(--rule-thin) solid var(--color-rule-strong);
  border-radius: var(--radius-sm);
  background: var(--color-panel);
  color: var(--color-ink);
  white-space: nowrap;
}

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

.site-rail {
  display: none;
}

.mobile-bar {
  position: sticky;
  inset-block-start: 0;
  z-index: var(--z-sticky);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-sm);
  min-height: 3.5rem;
  padding: var(--space-xs) var(--page-gutter);
  border-block-end: var(--rule-thin) solid var(--color-rule);
  background: var(--color-paper);
}

.mobile-brand,
.theme-toggle,
.rail-link,
.page-link,
.breadcrumb a,
.foot-links a {
  white-space: nowrap;
}

.mobile-brand {
  color: var(--color-ink);
  font-family: var(--font-display);
  font-weight: 700;
  text-decoration: none;
}

.page-select {
  min-width: 0;
  max-width: 8.5rem;
  min-height: 2.75rem;
  padding-inline: var(--space-xs);
  border: var(--rule-thin) solid var(--color-rule-strong);
  border-radius: var(--radius-sm);
  background: var(--color-panel);
  color: var(--color-ink);
  font-family: var(--font-body);
  outline: var(--rule-heavy) solid transparent;
  outline-offset: var(--rule-thin);
}

.page-select:focus-visible { outline-color: var(--color-focus); }
.page-select:active { background: var(--color-accent-soft); }
.page-select:disabled,
.page-select[aria-disabled="true"] {
  cursor: not-allowed;
  opacity: 0.55;
  color: var(--color-muted);
}
.page-select[aria-busy="true"] { border-style: dashed; }
.page-select[aria-invalid="true"] { border-color: var(--color-caution); }
.page-select[data-state="success"] { border-color: var(--color-good); }

.theme-toggle {
  min-width: 2.75rem;
  min-height: 2.75rem;
  padding-inline: var(--space-sm);
  border: var(--rule-thin) solid var(--color-rule-strong);
  border-radius: var(--radius-sm);
  background: var(--color-panel);
  color: var(--color-ink);
  cursor: pointer;
  transition: background-color var(--dur-short) var(--ease-out), transform var(--dur-micro) var(--ease-out);
}

.theme-toggle:active {
  transform: translateY(var(--rule-thin));
}

.theme-toggle:disabled,
.theme-toggle[aria-disabled="true"] {
  cursor: not-allowed;
  opacity: 0.55;
}

.theme-toggle[aria-busy="true"] {
  border-style: dashed;
}

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

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

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

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

.breadcrumb a {
  color: var(--color-ink-2);
}

.hero {
  display: grid;
  gap: var(--space-xl);
  padding-block: var(--space-lg) var(--space-2xl);
  border-block-end: var(--rule-thin) solid var(--color-rule);
}

.hero-copy,
.hero h1,
.section-head,
.prose {
  min-width: 0;
}

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

.hero h1 {
  max-width: 12ch;
  font-size: var(--text-display);
  line-height: 1.02;
  letter-spacing: -0.035em;
}

.hero-lede {
  max-width: 48ch;
  margin: var(--space-lg) 0 0;
  font-size: var(--text-md);
  line-height: 1.55;
}

.query-track {
  align-self: end;
  display: grid;
  gap: var(--space-lg);
  padding-block: var(--space-lg);
  border-block: var(--rule-thin) solid var(--color-rule-strong);
}

.track-row {
  display: grid;
  grid-template-columns: 4.5rem minmax(0, 1fr);
  gap: var(--space-md);
  align-items: center;
}

.track-label {
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
}

.track-line {
  position: relative;
  height: var(--rule-thin);
  background: var(--color-rule-strong);
}

.track-line::before,
.track-line::after {
  content: "";
  position: absolute;
  inset-block-start: 50%;
  width: var(--space-sm);
  height: var(--space-sm);
  border: var(--rule-heavy) solid var(--color-accent);
  border-radius: 50%;
  background: var(--color-paper);
  transform: translateY(-50%);
}

.track-line::before { inset-inline-start: 12%; }
.track-line::after { inset-inline-end: 20%; }

.reading-map {
  display: grid;
  gap: var(--rule-thin);
  margin-block: var(--space-2xl);
  border-block: var(--rule-thin) solid var(--color-rule);
  background: var(--color-rule);
}

.map-step {
  display: grid;
  grid-template-columns: 3rem minmax(0, 1fr);
  gap: var(--space-md);
  padding: var(--space-lg) 0;
  background: var(--color-paper);
}

.map-no {
  color: var(--color-accent);
  font-family: var(--font-display);
  font-variant-numeric: tabular-nums;
}

.map-step strong {
  display: block;
  color: var(--color-ink);
  font-size: var(--text-md);
}

.map-step p {
  margin: var(--space-xs) 0 0;
}

.prose {
  max-width: var(--measure);
  margin-inline: auto;
  padding-block: var(--space-2xl) var(--space-xl);
}

.prose section {
  margin-block: 0 var(--space-2xl);
}

.prose h2 {
  margin-block-end: var(--space-lg);
  font-size: clamp(var(--text-xl), 5vw, var(--text-2xl));
  line-height: 1.15;
  letter-spacing: -0.02em;
}

.prose h3 {
  margin-block: var(--space-xl) var(--space-md);
  font-size: var(--text-lg);
  line-height: 1.25;
}

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

.prose 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-heavy);
  text-underline-offset: var(--space-2xs);
}

.inline-head {
  color: var(--color-ink);
  font-variant-caps: all-small-caps;
  font-weight: 700;
  letter-spacing: 0.06em;
}

.note,
.case-study,
.decision-frame {
  margin-block: var(--space-xl);
  padding: var(--space-lg);
  border-block: var(--rule-thin) solid var(--color-rule-strong);
  background: var(--color-paper-2);
  color: var(--color-ink-2);
}

.note strong,
.case-study strong,
.decision-frame strong {
  color: var(--color-ink);
}

.pipeline {
  display: grid;
  gap: var(--space-sm);
  margin-block: var(--space-xl);
  padding: 0;
  list-style: none;
}

.pipeline li {
  display: grid;
  grid-template-columns: 2rem minmax(0, 1fr);
  gap: var(--space-md);
  padding-block: var(--space-md);
  border-block-end: var(--rule-thin) solid var(--color-rule);
}

.pipeline .node {
  color: var(--color-accent);
  font-family: var(--font-display);
  font-variant-numeric: tabular-nums;
}

.compare-wrap {
  margin-block: var(--space-xl);
}

.compare-table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--text-sm);
  font-variant-numeric: tabular-nums;
}

.compare-table th,
.compare-table td {
  padding: var(--space-md);
  border-block-end: var(--rule-thin) solid var(--color-rule);
  text-align: start;
  vertical-align: top;
}

.compare-table th {
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--text-xs);
  letter-spacing: 0.03em;
}

.compare-table tbody th {
  width: 24%;
  font-family: var(--font-body);
  font-size: var(--text-sm);
  letter-spacing: 0;
}

.signal-list {
  display: grid;
  gap: var(--space-sm);
  margin-block: var(--space-xl);
}

.signal-row {
  display: grid;
  grid-template-columns: minmax(7rem, 0.7fr) minmax(0, 1.8fr);
  gap: var(--space-lg);
  padding-block: var(--space-md);
  border-block-end: var(--rule-thin) solid var(--color-rule);
}

.signal-row dt {
  color: var(--color-ink);
  font-weight: 700;
}

.signal-row dd {
  margin: 0;
}

.page-turn {
  display: grid;
  gap: var(--space-sm);
  margin-block: var(--space-2xl) var(--space-xl);
  padding-block-start: var(--space-lg);
  border-block-start: var(--rule-heavy) solid var(--color-ink);
}

.page-turn p {
  margin: 0;
}

.page-link {
  width: fit-content;
  color: var(--color-ink);
  font-family: var(--font-display);
  font-size: var(--text-md);
  font-weight: 700;
  text-decoration-color: var(--color-accent);
}

.source-list {
  display: grid;
  gap: var(--space-lg);
  padding: 0;
  list-style: none;
}

.source-list li {
  padding-block-end: var(--space-lg);
  border-block-end: var(--rule-thin) solid var(--color-rule);
}

.source-list a {
  font-weight: 700;
}

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

.foot-mast {
  display: grid;
  gap: var(--space-md);
  margin-inline: auto;
  padding: var(--space-2xl) var(--page-gutter);
  border-block-start: var(--rule-thin) solid var(--color-rule);
  background: var(--color-paper-2);
}

.foot-wordmark {
  margin: 0;
  color: var(--color-ink);
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
}

.foot-tagline,
.foot-links {
  margin: 0;
  color: var(--color-muted);
}

.foot-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
}

.foot-links a {
  min-height: 2.75rem;
  display: inline-flex;
  align-items: center;
}

@media (hover: hover) and (pointer: fine) {
  a:hover { text-decoration-thickness: var(--rule-heavy); }
  .theme-toggle:hover { background: var(--color-accent-soft); }
  .page-select:hover { background: var(--color-accent-soft); }
  .rail-link:hover { color: var(--color-accent); }
}

@media (min-width: 40rem) {
  .hero {
    grid-template-columns: minmax(0, 1.35fr) minmax(14rem, 0.65fr);
    align-items: end;
  }

  .reading-map {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .map-step {
    grid-template-columns: 1fr;
    padding-inline: var(--space-lg);
  }
}

@media (min-width: 60rem) {
  .mobile-bar { display: none; }

  .site-rail {
    position: fixed;
    inset: 0 auto 0 0;
    z-index: var(--z-sticky);
    display: flex;
    width: var(--rail-width);
    flex-direction: column;
    align-items: center;
    justify-content: space-between;
    padding-block: var(--space-lg);
    border-inline-end: var(--rule-thin) solid var(--color-rule);
    background: var(--color-paper);
  }

  .rail-brand {
    color: var(--color-ink);
    font-family: var(--font-display);
    font-weight: 700;
    text-decoration: none;
    writing-mode: vertical-rl;
  }

  .rail-nav {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    align-items: center;
  }

  .rail-link {
    position: relative;
    display: grid;
    width: 2.75rem;
    height: 2.75rem;
    place-items: center;
    border-radius: 50%;
    color: var(--color-muted);
    font-family: var(--font-mono);
    font-size: var(--text-xs);
    text-decoration: none;
  }

  .rail-link[aria-current="page"] {
    background: var(--color-accent);
    color: var(--color-accent-ink);
  }

  .site-rail .theme-toggle {
    padding: 0;
    writing-mode: vertical-rl;
  }

  .page-shell,
  .foot-mast {
    padding-inline-start: calc(var(--page-gutter) + var(--rail-width));
  }

  .foot-mast {
    grid-template-columns: 1fr auto;
    align-items: end;
  }

  .foot-tagline { grid-column: 1; }
  .foot-links { grid-column: 2; grid-row: 1 / span 2; }
}

@media (max-width: 39.999rem) {
  .mobile-brand { display: none; }

  .mobile-bar {
    justify-content: space-between;
  }

  .compare-table,
  .compare-table tbody,
  .compare-table tr,
  .compare-table th,
  .compare-table td {
    display: block;
    width: 100%;
  }

  .compare-table thead {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: clip;
    clip-path: inset(50%);
  }

  .compare-table tr {
    padding-block: var(--space-md);
    border-block-end: var(--rule-heavy) solid var(--color-rule-strong);
  }

  .compare-table th,
  .compare-table td {
    padding: var(--space-xs) 0;
    border: 0;
  }

  .compare-table td::before {
    content: attr(data-label);
    display: block;
    margin-block-end: var(--space-2xs);
    color: var(--color-muted);
    font-family: var(--font-body);
    font-size: var(--text-xs);
  }

  .signal-row {
    grid-template-columns: minmax(0, 1fr);
    gap: var(--space-xs);
  }
}

@media (pointer: coarse) {
  .theme-toggle,
  .rail-link,
  .foot-links a {
    min-width: 2.75rem;
    min-height: 2.75rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 150ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 150ms !important;
  }
  .theme-toggle:active { transform: none; }
}

@media print {
  .site-rail,
  .mobile-bar,
  .skip-link { display: none; }
  .page-shell { width: 100%; padding: 0; }
  .foot-mast { padding-inline: 0; }
}