/* Hallmark · genre: editorial · macrostructure: Split Studio · theme: Studio · enrichment: none · nav: N9 · footer: Ft1 · audience: general · use: continuous learning · tone: technical editorial · anchor hue: laboratory green · contrast: pass (40–41) · slop: pass (42–45) · honest: pass (46) · chrome: pass (47) · tokens: pass (48) · responsive: pass (34, 49–57) · icons: pass (30) */
/* Hallmark · pre-emit critique: P5 H5 E4 S5 R5 V5 */
@import url("tokens.css");

html,
body {
  overflow-x: clip;
}

html {
  scroll-behavior: smooth;
  background: var(--color-paper);
}

* {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  min-width: 0;
  color: var(--color-ink-2);
  background: var(--color-paper);
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.68;
  text-rendering: optimizeLegibility;
}

button,
input {
  font: inherit;
}

a {
  color: var(--color-ink);
  text-decoration-color: var(--color-rule-strong);
  text-decoration-thickness: var(--rule-thin);
  text-underline-offset: 0.22em;
}

a:hover {
  text-decoration-color: var(--color-accent);
}

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

button:focus-visible {
  transition: none;
}

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

.skip-link {
  position: fixed;
  inset-block-start: var(--space-sm);
  inset-inline-start: var(--space-sm);
  z-index: var(--z-toast);
  padding: var(--space-sm) var(--space-md);
  color: var(--color-accent-ink);
  background: var(--color-accent);
  border-radius: var(--radius-control);
  transform: translateY(-180%);
  transition: transform var(--dur-short) var(--ease-out);
  white-space: nowrap;
}

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

.reading-progress {
  position: fixed;
  inset-block-start: 0;
  inset-inline: 0;
  z-index: var(--z-sticky);
  height: var(--space-2xs);
  background: var(--color-paper-3);
}

.reading-progress__fill {
  width: 100%;
  height: 100%;
  background: var(--color-accent);
  transform: scaleX(0);
  transform-origin: left center;
}

.site-header {
  position: relative;
  z-index: var(--z-dropdown);
  border-bottom: var(--rule-thin) solid var(--color-rule);
  background: var(--color-paper);
}

.nav-edge {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  width: min(100%, var(--page-max));
  margin-inline: auto;
  padding: var(--space-md) var(--page-gutter);
}

.wordmark {
  display: inline-flex;
  align-items: center;
  min-height: 2.75rem;
  font-family: var(--font-display);
  font-size: var(--text-md);
  font-weight: 700;
  letter-spacing: -0.025em;
  text-decoration: none;
  white-space: nowrap;
}

.wordmark::before {
  content: "";
  width: var(--space-sm);
  height: var(--space-sm);
  margin-inline-end: var(--space-sm);
  background: var(--color-accent);
  border-radius: 50%;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.control {
  min-height: 2.75rem;
  padding-inline: var(--space-md);
  color: var(--color-ink);
  background: var(--color-panel);
  border: var(--rule-thin) solid var(--color-rule-strong);
  border-radius: var(--radius-control);
  cursor: pointer;
  font-weight: 700;
  line-height: 1;
  white-space: nowrap;
  transition: background-color var(--dur-short) var(--ease-out), transform var(--dur-micro) var(--ease-out);
}

@media (hover: hover) and (pointer: fine) {
  .control:hover {
    background: var(--color-paper-2);
  }
}

.control:active,
.control[data-state="active"] {
  transform: translateY(1px);
}

.control[data-state="loading"] {
  cursor: progress;
}

.control[data-state="error"] {
  color: var(--color-error);
  background: var(--color-error-soft);
  border-color: var(--color-error);
}

.control[data-state="success"] {
  color: var(--color-success);
  background: var(--color-success-soft);
  border-color: var(--color-success);
}

.nav-drawer {
  border-top: var(--rule-thin) solid var(--color-rule);
  border-bottom: var(--rule-thin) solid var(--color-rule);
  background: var(--color-paper-2);
}

.nav-drawer[hidden] {
  display: none;
}

.nav-drawer ul {
  display: grid;
  width: min(100%, var(--page-max));
  margin: 0 auto;
  padding: var(--space-md) var(--page-gutter);
  list-style: none;
}

.nav-drawer a {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-sm);
  min-height: 2.75rem;
  padding-block: var(--space-sm);
  border-bottom: var(--rule-thin) solid var(--color-rule);
  text-decoration: none;
  white-space: nowrap;
}

.nav-drawer li:last-child a {
  border-bottom: 0;
}

.nav-drawer a[aria-current="page"] {
  color: var(--color-accent);
  font-weight: 700;
}

.nav-drawer small {
  color: var(--color-muted);
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-xs);
  width: min(100% - (2 * var(--page-gutter)), var(--page-max));
  margin: var(--space-lg) auto 0;
  color: var(--color-muted);
  font-size: var(--text-sm);
}

.breadcrumb a,
.chapter-nav a,
.foot-mast a {
  white-space: nowrap;
}

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

.hero-split {
  display: grid;
  gap: var(--space-2xl);
  align-items: center;
  padding-block: var(--space-xl) var(--space-3xl);
  border-bottom: var(--rule-thin) solid var(--color-rule);
}

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

.chapter-mark {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  margin: 0 0 var(--space-md);
  color: var(--color-accent);
  font-size: var(--text-sm);
  font-weight: 700;
}

.chapter-mark::before {
  content: "";
  width: var(--space-md);
  height: var(--rule-strong);
  background: var(--color-accent);
}

h1,
h2,
h3 {
  margin: 0;
  min-width: 0;
  overflow-wrap: anywhere;
  color: var(--color-ink);
  font-family: var(--font-display);
  font-style: normal;
  font-weight: 800;
}

h1 {
  max-width: 9ch;
  font-size: var(--text-display);
  line-height: 1.02;
  letter-spacing: -0.045em;
}

h2 {
  max-width: 18ch;
  font-size: var(--text-2xl);
  line-height: 1.12;
  letter-spacing: -0.03em;
}

h3 {
  font-size: var(--text-lg);
  line-height: 1.22;
  letter-spacing: -0.018em;
}

.lede {
  max-width: 40ch;
  margin: var(--space-lg) 0 0;
  color: var(--color-ink-2);
  font-size: var(--text-md);
  line-height: 1.55;
}

.hero-note {
  max-width: 58ch;
  margin: var(--space-lg) 0 0;
  padding-block-start: var(--space-md);
  border-top: var(--rule-thin) solid var(--color-rule);
  color: var(--color-muted);
  font-size: var(--text-sm);
}

.state-board,
.circuit-board,
.evidence-board {
  margin: 0;
  padding: var(--space-lg);
  color: var(--color-dark-ink);
  background: var(--color-dark-band);
  border-radius: var(--radius-panel);
}

.state-board__title,
.board-label {
  display: flex;
  justify-content: space-between;
  gap: var(--space-md);
  margin: 0 0 var(--space-lg);
  color: var(--color-dark-muted);
  font-size: var(--text-sm);
  font-weight: 700;
}

.state-line {
  display: grid;
  grid-template-columns: 2.5rem minmax(0, 1fr) auto;
  gap: var(--space-sm);
  align-items: center;
  margin-block: var(--space-md);
  font-variant-numeric: tabular-nums;
}

.state-track {
  height: var(--space-sm);
  background: var(--color-paper-3);
  border-radius: var(--radius-control);
  overflow: clip;
}

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

.state-fill--half {
  width: 50%;
}

.state-phase {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  gap: var(--space-sm);
  align-items: center;
  margin-block-start: var(--space-lg);
  color: var(--color-dark-ink);
}

.state-phase span:not(.phase-sign) {
  padding: var(--space-sm);
  text-align: center;
  border: var(--rule-thin) solid var(--color-rule-strong);
  border-radius: var(--radius-control);
}

.phase-sign {
  color: var(--color-accent);
  font-size: var(--text-lg);
  font-weight: 800;
}

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

.state-board figcaption,
.circuit-board figcaption,
.evidence-board figcaption {
  color: var(--color-dark-muted);
}

.article-flow {
  display: grid;
  gap: var(--space-3xl);
  padding-block-start: var(--space-3xl);
}

.studio-row {
  display: grid;
  gap: var(--space-xl);
  align-items: start;
}

.studio-copy > :first-child,
.studio-proof > :first-child {
  margin-block-start: 0;
}

.studio-copy p,
.prose-wide p,
.source-entry p {
  max-width: var(--measure);
  margin: var(--space-md) 0 0;
}

.studio-copy p:first-of-type,
.prose-wide p:first-of-type {
  margin-block-start: var(--space-lg);
}

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-strong);
  text-underline-offset: 0.16em;
}

.source-ref {
  display: inline-flex;
  align-items: center;
  min-width: 1.6rem;
  min-height: 1.6rem;
  margin-inline: var(--space-3xs);
  color: var(--color-accent);
  font-size: var(--text-xs);
  font-weight: 700;
  text-decoration: none;
  vertical-align: super;
  white-space: nowrap;
}

.split-note,
.fact-row,
.claim-test {
  border-top: var(--rule-thin) solid var(--color-rule);
}

.split-note {
  margin-block-start: var(--space-lg);
  padding-block: var(--space-lg);
}

.split-note strong {
  display: block;
  margin-block-end: var(--space-xs);
  color: var(--color-ink);
}

.simulator {
  padding: var(--space-lg);
  background: var(--color-paper-2);
  border: var(--rule-thin) solid var(--color-rule-strong);
  border-radius: var(--radius-panel);
}

.simulator h3 {
  margin-block-end: var(--space-sm);
}

.simulator p {
  margin: 0 0 var(--space-md);
}

.sim-controls {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
}

.sim-controls .control[aria-pressed="true"] {
  color: var(--color-accent-ink);
  background: var(--color-accent);
  border-color: var(--color-accent);
}

.sim-results {
  display: grid;
  gap: var(--space-sm);
  margin-block-start: var(--space-lg);
  padding-block-start: var(--space-lg);
  border-top: var(--rule-thin) solid var(--color-rule);
}

.result-line {
  display: grid;
  grid-template-columns: 2rem minmax(0, 1fr) 3.5rem;
  gap: var(--space-sm);
  align-items: center;
  font-variant-numeric: tabular-nums;
}

.result-track {
  height: var(--space-md);
  overflow: clip;
  background: var(--color-panel);
  border: var(--rule-thin) solid var(--color-rule);
  border-radius: var(--radius-control);
}

.result-fill {
  display: block;
  width: 100%;
  height: 100%;
  background: var(--color-accent);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--dur-short) var(--ease-out);
}

.sim-status {
  min-height: 1.7em;
  margin: var(--space-sm) 0 0;
  color: var(--color-muted);
  font-size: var(--text-sm);
}

.dark-band {
  margin-inline: calc(-1 * var(--page-gutter));
  padding: var(--space-2xl) var(--page-gutter);
  color: var(--color-dark-ink);
  background: var(--color-dark-band);
}

.dark-band h2,
.dark-band h3,
.dark-band dfn,
.dark-band strong,
.dark-band a {
  color: var(--color-dark-ink);
}

.dark-band p {
  color: var(--color-dark-muted);
}

.door-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-sm);
  margin-block-start: var(--space-lg);
}

.door {
  display: grid;
  place-items: center;
  aspect-ratio: 4 / 3;
  color: var(--color-dark-ink);
  border: var(--rule-thin) solid var(--color-rule-strong);
  border-radius: var(--radius-control);
  font-weight: 800;
  font-variant-numeric: tabular-nums;
}

.door--marked {
  color: var(--color-accent-ink);
  background: var(--color-accent);
  border-color: var(--color-accent);
}

.circuit-lines {
  display: grid;
  gap: var(--space-lg);
}

.wire {
  display: grid;
  grid-template-columns: auto repeat(4, minmax(2.75rem, 1fr));
  gap: var(--space-xs);
  align-items: center;
  min-width: 0;
}

.wire::before {
  content: "";
  position: absolute;
}

.wire-label {
  color: var(--color-dark-muted);
  font-weight: 700;
}

.gate,
.wire-end {
  display: grid;
  place-items: center;
  min-height: 2.75rem;
  color: var(--color-dark-ink);
  border: var(--rule-thin) solid var(--color-rule-strong);
  border-radius: var(--radius-control);
  font-weight: 800;
}

.gate--signal {
  color: var(--color-accent-ink);
  background: var(--color-accent);
  border-color: var(--color-accent);
}

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

.fact-row,
.claim-test {
  display: grid;
  gap: var(--space-xs);
  padding-block: var(--space-md);
}

.fact-row strong,
.claim-test strong {
  color: var(--color-ink);
}

.fact-row span,
.claim-test span {
  color: var(--color-muted);
}

.formula {
  margin: var(--space-lg) 0 0;
  padding: var(--space-lg);
  overflow-wrap: anywhere;
  color: var(--color-ink);
  background: var(--color-paper-2);
  border-radius: var(--radius-panel);
  font-family: var(--font-display);
  font-size: var(--text-md);
  text-align: center;
}

.comparison-table {
  width: 100%;
  margin-block-start: var(--space-lg);
  border-collapse: collapse;
}

.comparison-table th,
.comparison-table td {
  padding: var(--space-md) 0;
  text-align: start;
  vertical-align: top;
  border-bottom: var(--rule-thin) solid var(--color-rule);
}

.comparison-table th {
  color: var(--color-ink);
  font-weight: 700;
}

.comparison-table td {
  padding-inline-start: var(--space-md);
}

blockquote {
  max-width: 45ch;
  margin: var(--space-xl) 0;
  padding-inline-start: var(--space-lg);
  color: var(--color-ink);
  border-inline-start: var(--rule-strong) solid var(--color-accent);
  font-family: var(--font-display);
  font-size: var(--text-lg);
  line-height: 1.45;
}

blockquote p {
  margin: 0;
}

.prose-wide {
  max-width: 76rem;
}

.source-list {
  display: grid;
  gap: var(--space-xl);
}

.source-entry {
  scroll-margin-top: var(--space-3xl);
  padding-block-start: var(--space-lg);
  border-top: var(--rule-thin) solid var(--color-rule);
}

.source-entry h2 {
  max-width: 28ch;
  font-size: var(--text-xl);
}

.source-entry a {
  display: inline-block;
  margin-block-start: var(--space-sm);
  color: var(--color-accent);
  font-weight: 700;
  white-space: normal;
}

.chapter-nav {
  display: grid;
  gap: var(--space-md);
  margin-block-start: var(--space-3xl);
  padding-block-start: var(--space-xl);
  border-top: var(--rule-thin) solid var(--color-rule);
}

.chapter-nav a {
  display: grid;
  gap: var(--space-2xs);
  min-height: 4.25rem;
  align-content: center;
  color: var(--color-ink);
  text-decoration: none;
}

.chapter-nav a:last-child {
  text-align: end;
}

.chapter-nav small {
  color: var(--color-muted);
}

.foot-mast {
  display: grid;
  gap: var(--space-md);
  padding: var(--space-2xl) var(--page-gutter) var(--space-xl);
  color: var(--color-dark-muted);
  background: var(--color-dark-band);
}

.foot-mast .wordmark {
  color: var(--color-dark-ink);
}

.foot-mast .wordmark::before {
  display: none;
}

.foot-mast p {
  margin: 0;
}

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

.foot-mast a {
  color: var(--color-dark-ink);
}

@media (max-width: 34rem) {
  .theme-label-long {
    display: none;
  }

  .control {
    padding-inline: var(--space-sm);
  }

  .wire {
    grid-template-columns: auto repeat(4, minmax(2.2rem, 1fr));
    gap: var(--space-2xs);
  }

  .gate,
  .wire-end {
    min-height: 2.5rem;
    font-size: var(--text-sm);
  }

  .comparison-table,
  .comparison-table tbody,
  .comparison-table tr,
  .comparison-table th,
  .comparison-table td {
    display: block;
  }

  .comparison-table tr {
    padding-block: var(--space-md);
    border-bottom: var(--rule-thin) solid var(--color-rule);
  }

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

  .comparison-table td::before {
    content: attr(data-label) "：";
    color: var(--color-muted);
    font-weight: 700;
  }
}

@media (min-width: 40rem) {
  .nav-drawer ul {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0 var(--space-xl);
  }

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

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

  .foot-mast {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
    align-items: end;
  }

  .foot-links {
    justify-content: end;
  }
}

@media (min-width: 60rem) {
  .hero-split {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    gap: var(--space-3xl);
  }

  .studio-row {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    gap: var(--space-3xl);
  }

  .studio-row--reverse .studio-copy {
    order: 2;
  }

  .studio-row--reverse .studio-proof {
    order: 1;
  }

  .dark-band {
    margin-inline: calc(-1 * var(--page-gutter));
    padding-inline: max(var(--page-gutter), calc((100% - 76rem) / 2));
  }

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

@media (pointer: coarse) {
  .control,
  .nav-drawer a,
  .chapter-nav a {
    min-height: 3rem;
  }
}

@media print {
  .reading-progress,
  .skip-link,
  .nav-actions,
  .nav-drawer,
  .sim-controls {
    display: none !important;
  }

  .site-header {
    position: static;
  }

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

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

  *,
  *::before,
  *::after {
    animation-duration: var(--dur-micro) !important;
    animation-iteration-count: 1 !important;
    transition-duration: var(--dur-micro) !important;
  }

  .result-fill {
    transition: none;
  }
}