/* Hallmark · macrostructure: Map / Diagram · N3 Side rail: left/12ch/numbered · Ft4 Dense typographic: mono/paragraphs/date · F3: 5 columns/every row/tabular · F4: 01-04/horizontal/line */

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--space-6);
}

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;
  -webkit-font-smoothing: antialiased;
}

button,
a {
  font: inherit;
}

button {
  color: inherit;
}

a {
  color: inherit;
}

img,
svg {
  display: block;
  max-width: 100%;
}

::selection {
  background: var(--color-sage-pale);
  color: var(--color-sage-dark);
}

:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 3px;
}

.skip-link {
  position: fixed;
  inset-block-start: var(--space-4);
  inset-inline-start: var(--space-4);
  z-index: 100;
  min-height: 44px;
  padding: var(--space-2) var(--space-4);
  border: 1px solid var(--color-ink);
  background: var(--color-paper);
  transform: translateY(-160%);
}

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

.rail {
  position: fixed;
  inset: 0 auto 0 0;
  z-index: var(--z-sticky-nav);
  display: flex;
  width: var(--rail-width);
  flex-direction: column;
  border-inline-end: 1px solid var(--color-rule);
  background: var(--color-paper);
}

.rail__brand {
  display: grid;
  min-height: 5.5rem;
  place-items: center;
  border-block-end: 1px solid var(--color-rule);
  font-family: var(--font-display);
  font-size: var(--text-md);
  font-weight: 600;
  text-decoration: none;
}

.rail__progress {
  position: absolute;
  inset: 5.5rem auto 5.25rem 0;
  width: 3px;
  background: var(--color-sage-pale);
}

.rail__progress span {
  display: block;
  width: 100%;
  height: 0;
  background: var(--color-sage);
  transition: height 120ms linear;
}

.rail__nav {
  display: grid;
  flex: 1;
  grid-template-rows: repeat(6, 1fr);
  min-height: 0;
}

.rail__nav a {
  display: grid;
  min-height: 4.5rem;
  align-content: center;
  padding: var(--space-2) var(--space-3) var(--space-2) var(--space-6);
  border-block-end: 1px solid var(--color-rule);
  color: var(--color-muted);
  text-decoration: none;
  transition: background-color 160ms ease-out, color 160ms ease-out;
}

.rail__nav a span {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  line-height: 1;
}

.rail__nav a small {
  margin-block-start: var(--space-1);
  font-size: 0.6875rem;
  line-height: 1.3;
}

.rail__nav a[aria-current="location"] {
  background: var(--color-sage-pale);
  color: var(--color-sage-dark);
  box-shadow: inset 4px 0 0 var(--color-sage);
}

.rail__print {
  display: flex;
  min-height: 5.25rem;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  border: 0;
  border-block-start: 1px solid var(--color-rule);
  background: var(--color-paper);
  color: var(--color-sage-dark);
  cursor: pointer;
}

.rail__print svg {
  width: 1.25rem;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.5;
}

.rail__print span {
  font-size: var(--text-xs);
}

main,
.document-footer {
  margin-inline-start: var(--rail-width);
}

main > *,
.document-footer {
  padding-inline: clamp(var(--space-6), 5vw, var(--space-16));
}

.hero,
main > section,
.document-footer {
  max-width: calc(var(--content-max) + var(--rail-width));
  margin-inline-end: auto;
}

.hero {
  display: grid;
  min-height: min(50rem, 92dvh);
  grid-template-columns: minmax(0, 2.2fr) minmax(16rem, 0.8fr);
  align-items: end;
  gap: var(--space-12);
  padding-block: clamp(var(--space-16), 10vh, 8rem) var(--space-16);
  border-block-end: 1px solid var(--color-rule-strong);
}

.hero h1 {
  max-width: 13ch;
  margin: 0;
  font-family: var(--font-display);
  font-size: var(--text-display);
  font-weight: 400;
  letter-spacing: -0.045em;
  line-height: 1.08;
}

.hero h1 em {
  color: var(--color-sage-dark);
  font-style: normal;
}

.hero-title-line {
  display: inline-block;
  font-size: 0.9em;
  white-space: nowrap;
}

.hero__lead {
  margin: var(--space-8) 0 0;
  font-family: var(--font-display);
  font-size: clamp(var(--text-md), 2vw, var(--text-lg));
  line-height: 1.6;
}

.hero__status {
  display: flex;
  max-width: 40rem;
  align-items: center;
  gap: var(--space-4);
  margin-block-start: var(--space-12);
  color: var(--color-ink-soft);
}

.hero__status span {
  width: 6rem;
  height: 2px;
  flex: none;
  background: var(--color-sage);
}

.hero__status p {
  margin: 0;
}

.hero__status strong {
  color: var(--color-ink);
}

.hero__meta {
  margin: 0;
  border-block-start: 1px solid var(--color-rule-strong);
}

.hero__meta div {
  display: grid;
  grid-template-columns: 7rem 1fr;
  gap: var(--space-4);
  padding-block: var(--space-4);
  border-block-end: 1px solid var(--color-rule);
}

.hero__meta dt,
.hero__meta dd {
  margin: 0;
}

.hero__meta dt {
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
}

.hero__meta dd {
  font-size: var(--text-sm);
}

main > section {
  padding-block: var(--space-16);
  border-block-end: 1px solid var(--color-rule-strong);
}

.section-head {
  display: grid;
  grid-template-columns: minmax(9rem, 0.32fr) minmax(0, 1fr);
  gap: var(--space-8);
  margin-block-end: var(--space-12);
}

.section-index,
.map-axis,
.ledger-key,
.fitness-loop__label,
.platform-node__label,
.channel-panel__tag,
.own-event-note > span,
.pricing-principle > p,
.guardrail-item > p,
.next-output > p {
  margin: 0;
  color: var(--color-sage-dark);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.08em;
}

.section-head h2,
.discussion-head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(var(--text-2xl), 4.2vw, var(--text-3xl));
  font-weight: 400;
  letter-spacing: -0.03em;
  line-height: 1.15;
}

.section-head > div > p {
  max-width: 44rem;
  margin: var(--space-4) 0 0;
  color: var(--color-muted);
}

.section-head--sticky {
  position: sticky;
  top: var(--banner-height);
  z-index: var(--z-sticky);
  padding-block: var(--space-3);
  background: var(--color-paper);
  border-block-end: 1px solid var(--color-rule);
}

.business-map {
  position: relative;
  display: grid;
  grid-template-columns: minmax(17rem, 1fr) minmax(19rem, 1.2fr) minmax(17rem, 1fr);
  grid-template-rows: auto auto;
  gap: var(--space-8) clamp(var(--space-6), 4vw, var(--space-12));
  align-items: center;
  min-height: 40rem;
  padding: var(--space-8);
  background:
    linear-gradient(var(--color-rule) 1px, transparent 1px),
    linear-gradient(90deg, var(--color-rule) 1px, transparent 1px),
    var(--color-surface);
  background-size: 2rem 2rem;
  border: 1px solid var(--color-rule-strong);
  overflow: hidden;
}

.business-map::before,
.business-map::after {
  content: "";
  position: absolute;
  z-index: 0;
  inset-block-start: 50%;
  height: 1px;
  background: var(--color-sage);
  opacity: 0.55;
}

.business-map::before {
  inset-inline: 21% 50%;
}

.business-map::after {
  inset-inline: 50% 21%;
  background: var(--color-clay);
  border-block-start: 1px dashed var(--color-clay);
}

.map-group,
.platform-node,
.map-loop {
  position: relative;
  z-index: 1;
}

.map-axis {
  display: flex;
  justify-content: space-between;
  padding-block-end: var(--space-3);
  border-block-end: 1px solid var(--color-sage);
}

.map-group--revenue .map-axis {
  color: var(--color-clay-dark);
  border-color: var(--color-clay);
}

.map-axis span {
  color: inherit;
  font-family: var(--font-body);
  letter-spacing: 0;
}

.channel-nodes {
  display: grid;
  gap: var(--space-3);
  margin: var(--space-4) 0 0;
  padding: 0;
  list-style: none;
}

.channel-nodes li {
  display: grid;
  grid-template-columns: 2rem 1fr;
  gap: var(--space-3);
  padding: var(--space-3);
  border: 1px solid var(--color-sage);
  background: var(--color-surface);
}

.node-number {
  color: var(--color-sage-dark);
  font-family: var(--font-display);
  font-size: var(--text-lg);
  line-height: 1;
}

.channel-nodes h3,
.channel-nodes p,
.channel-nodes small,
.revenue-node h3,
.revenue-node p {
  margin: 0;
}

.channel-nodes h3 {
  font-size: var(--text-base);
  line-height: 1.35;
}

.channel-nodes p {
  color: var(--color-sage-dark);
  font-size: var(--text-xs);
}

.channel-nodes small {
  color: var(--color-muted);
  font-size: 0.6875rem;
}

.graduation-note {
  margin: var(--space-4) 0 0;
  padding-inline-start: var(--space-4);
  border-inline-start: 2px dashed var(--color-clay);
  color: var(--color-clay-dark);
  font-size: var(--text-xs);
}

.platform-node {
  aspect-ratio: 1;
  display: grid;
  align-content: center;
  justify-items: center;
  padding: clamp(var(--space-6), 3vw, var(--space-12));
  border: 2px solid var(--color-sage);
  border-radius: 50%;
  background: var(--color-paper);
  text-align: center;
}

.platform-node h3 {
  margin: var(--space-3) 0 0;
  font-family: var(--font-display);
  font-size: clamp(var(--text-md), 2.2vw, var(--text-xl));
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.35;
}

.platform-node > p:not(.platform-node__label) {
  margin: var(--space-1) 0 0;
  color: var(--color-sage-dark);
  font-weight: 700;
}

.platform-node hr {
  width: 72%;
  margin: var(--space-4) 0;
  border: 0;
  border-block-start: 1px solid var(--color-sage);
}

.platform-node dl {
  display: grid;
  gap: var(--space-2);
  width: 100%;
  margin: 0;
}

.platform-node dl div {
  display: grid;
  grid-template-columns: 3rem 1fr;
  gap: var(--space-2);
  text-align: start;
}

.platform-node dt {
  color: var(--color-sage-dark);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
}

.platform-node dd {
  margin: 0;
  font-size: var(--text-xs);
}

.map-group--revenue {
  display: grid;
  gap: var(--space-4);
}

.revenue-node {
  display: grid;
  grid-template-columns: 2rem 1fr;
  gap: var(--space-3);
  padding: var(--space-4);
  border: 1px solid var(--color-clay);
  background: var(--color-surface);
}

.revenue-node > span {
  color: var(--color-clay-dark);
  font-family: var(--font-display);
  font-size: var(--text-lg);
  line-height: 1;
}

.revenue-node h3 {
  color: var(--color-clay-dark);
  font-size: var(--text-base);
}

.revenue-node p {
  font-size: var(--text-xs);
}

.revenue-node ul {
  grid-column: 2;
  margin: 0;
  padding-inline-start: var(--space-4);
  color: var(--color-ink-soft);
  font-size: var(--text-xs);
}

.map-loop {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  padding-block-start: var(--space-6);
  border-block-start: 1px solid var(--color-sage);
  color: var(--color-sage-dark);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
}

.map-loop i {
  width: clamp(1rem, 4vw, 4rem);
  height: 1px;
  background: var(--color-sage);
}

.map-caption {
  max-width: 60rem;
  margin: var(--space-6) auto 0;
  color: var(--color-muted);
  text-align: center;
}

.map-caption strong {
  color: var(--color-sage-dark);
}

.channel-workbench {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(17rem, 0.5fr);
  gap: var(--space-8);
}

.channel-tabs {
  grid-column: 1;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-block-end: 1px solid var(--color-rule-strong);
}

.channel-tabs button {
  min-height: 48px;
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--color-rule-strong);
  border-block-end: 0;
  background: transparent;
  cursor: pointer;
  font-size: var(--text-sm);
  transition: background-color 160ms ease-out, color 160ms ease-out;
}

.channel-tabs button + button {
  border-inline-start: 0;
}

.channel-tabs button[aria-selected="true"] {
  background: var(--color-sage);
  color: var(--color-accent-ink);
}

.channel-panel {
  grid-column: 1;
  min-height: 25rem;
  padding: var(--space-8);
  border: 1px solid var(--color-sage);
  border-block-start: 0;
  background: var(--color-surface);
}

.channel-panel.is-changing {
  animation: panel-in 180ms ease-out;
}

.channel-panel__intro {
  display: grid;
  grid-template-columns: 5rem 1fr;
  gap: var(--space-6);
  padding-block-end: var(--space-6);
  border-block-end: 1px solid var(--color-rule);
}

.channel-panel__number {
  margin: 0;
  color: var(--color-sage);
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  line-height: 1;
}

.channel-panel__intro h3 {
  margin: var(--space-1) 0 var(--space-2);
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 400;
  line-height: 1.2;
}

.channel-panel__intro div > p:last-child {
  max-width: 48rem;
  margin: 0;
  color: var(--color-muted);
}

.channel-panel__spec {
  margin: var(--space-4) 0 0;
}

.channel-panel__spec div {
  display: grid;
  grid-template-columns: 9rem 1fr;
  gap: var(--space-4);
  padding-block: var(--space-3);
  border-block-end: 1px solid var(--color-rule);
}

.channel-panel__spec dt {
  color: var(--color-sage-dark);
  font-weight: 700;
}

.channel-panel__spec dd {
  margin: 0;
}

.channel-panel__question {
  display: flex;
  align-items: baseline;
  gap: var(--space-3);
  margin: var(--space-6) 0 0;
  padding: var(--space-4);
  background: var(--color-clay-pale);
  color: var(--color-clay-dark);
}

.channel-panel__question span {
  flex: none;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
}

.own-event-note {
  grid-column: 2;
  grid-row: 1 / 3;
  align-self: stretch;
  padding: var(--space-8);
  border-inline-start: 1px solid var(--color-rule-strong);
}

.own-event-note h3 {
  margin: var(--space-6) 0;
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 400;
  line-height: 1.4;
}

.own-event-note p {
  margin: 0;
  color: var(--color-muted);
}

.journey-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  margin: 0;
  padding: 0;
  border: 1px solid var(--color-sage);
  list-style: none;
}

.journey-steps li {
  position: relative;
  display: grid;
  grid-template-columns: 3.5rem 1fr;
  gap: var(--space-3);
  min-height: 12rem;
  padding: var(--space-6);
}

.journey-steps li + li {
  border-inline-start: 1px solid var(--color-rule-strong);
}

.journey-steps li:not(:last-child)::after {
  content: "";
  position: absolute;
  z-index: 1;
  inset-block-start: 50%;
  inset-inline-end: -0.45rem;
  width: 0.75rem;
  height: 0.75rem;
  border-block-start: 1px solid var(--color-sage);
  border-inline-end: 1px solid var(--color-sage);
  background: var(--color-paper);
  transform: rotate(45deg);
}

.journey-steps li > span {
  color: var(--color-sage);
  font-family: var(--font-display);
  font-size: var(--text-xl);
  line-height: 1;
}

.journey-steps h3 {
  margin: 0 0 var(--space-3);
  font-size: var(--text-md);
}

.journey-steps p {
  margin: 0;
  color: var(--color-muted);
  font-size: var(--text-sm);
}

.fitness-loop {
  display: grid;
  grid-template-columns: 10rem 1fr;
  gap: var(--space-4) var(--space-8);
  margin-block-start: var(--space-8);
  padding: var(--space-6) 0;
  border-block: 1px solid var(--color-rule-strong);
}

.fitness-loop > div {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  font-size: var(--text-sm);
}

.fitness-loop > div span {
  color: var(--color-sage);
}

.fitness-loop > p:last-child {
  grid-column: 2;
  max-width: 56rem;
  margin: 0;
  color: var(--color-muted);
}

.revenue-ledgers {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-8);
}

.revenue-ledgers article {
  padding: var(--space-6) 0;
  border-block: 1px solid var(--color-sage);
}

.revenue-ledgers article:last-child {
  border-color: var(--color-clay);
}

.revenue-ledgers article:last-child .ledger-key,
.revenue-ledgers article:last-child h3 {
  color: var(--color-clay-dark);
}

.revenue-ledgers h3 {
  margin: var(--space-3) 0 var(--space-4);
  color: var(--color-sage-dark);
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 400;
}

.revenue-ledgers ul {
  margin: 0;
  padding-inline-start: var(--space-6);
}

.pricing-principle {
  display: grid;
  grid-template-columns: minmax(9rem, 0.25fr) minmax(0, 0.75fr);
  gap: var(--space-8);
  margin-block: var(--space-12);
  padding: var(--space-8);
  background: var(--color-sage-pale);
  color: var(--color-ink);
}

.pricing-principle blockquote {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(var(--text-md), 2.7vw, var(--text-xl));
  line-height: 1.45;
}

.pricing-principle blockquote strong {
  color: var(--color-sage-dark);
  font-weight: 600;
}

.equation {
  grid-column: 2;
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding-block-start: var(--space-4);
  border-block-start: 1px solid var(--color-sage);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
}

.equation b {
  color: var(--color-sage-dark);
}

.table-wrap {
  max-width: 100%;
  overflow-x: auto;
}

.spec-table {
  width: 100%;
  min-width: 56rem;
  border-collapse: collapse;
  font-size: var(--text-sm);
  font-variant-numeric: tabular-nums;
}

.spec-table caption {
  padding-block-end: var(--space-3);
  color: var(--color-sage-dark);
  font-weight: 700;
  text-align: start;
}

.spec-table th,
.spec-table td {
  padding: var(--space-3) var(--space-4);
  border-block: 1px solid var(--color-rule-strong);
  text-align: start;
}

.spec-table thead th {
  background: var(--color-paper-deep);
  color: var(--color-ink-soft);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
}

.spec-table tbody th {
  color: var(--color-sage-dark);
}

.spec-table td span {
  color: var(--color-clay-dark);
  font-weight: 700;
}

.revenue-note {
  margin: var(--space-6) 0 0;
  padding-inline-start: var(--space-4);
  border-inline-start: 2px solid var(--color-clay);
  color: var(--color-muted);
}

.revenue-note strong {
  color: var(--color-ink);
}

.guardrail-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  border-block-start: 1px solid var(--color-rule-strong);
}

.guardrail-item {
  padding: var(--space-8) var(--space-6);
  border-block-end: 1px solid var(--color-rule-strong);
}

.guardrail-item:nth-child(odd) {
  border-inline-end: 1px solid var(--color-rule-strong);
}

.guardrail-item--wide {
  grid-column: 1 / -1;
  border-inline-end: 0 !important;
}

.guardrail-item h3 {
  margin: var(--space-2) 0 0;
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 400;
}

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

.guardrail-item > ul,
.responsibility-split ul {
  margin: var(--space-6) 0 0;
  padding-inline-start: var(--space-6);
}

.responsibility-split {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-8);
  margin-block-start: var(--space-6);
}

.responsibility-split > div {
  padding: var(--space-6);
  background: var(--color-sage-pale);
}

.responsibility-split > div:last-child {
  background: var(--color-paper-deep);
}

.responsibility-split ul {
  margin-block-start: var(--space-3);
}

.legal-note {
  margin: var(--space-6) 0 0;
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--color-clay);
  color: var(--color-clay-dark);
  font-size: var(--text-sm);
}

.discussion-section {
  display: grid;
  grid-template-columns: minmax(16rem, 0.65fr) minmax(0, 1.35fr);
  gap: var(--space-12);
  background: var(--color-ink);
  color: var(--color-paper);
}

.discussion-head {
  position: sticky;
  top: var(--space-8);
  align-self: start;
}

.discussion-head .section-index {
  color: var(--color-clay-pale);
}

.discussion-head h2 {
  margin-block-start: var(--space-6);
}

.discussion-head > p:last-child {
  max-width: 28rem;
  color: var(--color-rule-strong);
}

.decision-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.decision-list li {
  display: grid;
  grid-template-columns: 4rem 1fr;
  gap: var(--space-4);
  padding-block: var(--space-6);
  border-block-end: 1px solid var(--color-ink-soft);
}

.decision-list li > span {
  color: var(--color-clay-pale);
  font-family: var(--font-display);
  font-size: var(--text-xl);
  line-height: 1;
}

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

.decision-list p {
  margin: var(--space-2) 0 0;
  color: var(--color-rule-strong);
}

.next-output {
  grid-column: 2;
  padding: var(--space-6);
  border: 1px solid var(--color-muted);
}

.next-output > p {
  color: var(--color-clay-pale);
}

.next-output ol {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2) var(--space-6);
  margin: var(--space-3) 0 0;
  padding: 0;
  list-style-position: inside;
}

.document-footer {
  display: grid;
  grid-template-columns: 1fr 2fr auto;
  gap: var(--space-8);
  padding-block: var(--space-8);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  line-height: 1.6;
}

.document-footer p {
  margin: 0;
}

.document-footer a {
  align-self: start;
  min-height: 44px;
  white-space: nowrap;
  text-underline-offset: 0.3em;
}

@keyframes panel-in {
  from { opacity: 0.55; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

@media (hover: hover) {
  .rail__nav a:hover {
    background: var(--color-sage-pale);
    color: var(--color-sage-dark);
  }

  .rail__print:hover,
  .channel-tabs button:hover:not([aria-selected="true"]) {
    background: var(--color-paper-deep);
  }

  .document-footer a:hover {
    color: var(--color-sage-dark);
    text-decoration-thickness: 2px;
  }
}

@media (max-width: 72rem) {
  :root {
    --rail-width: 5rem;
  }

  .rail__nav a {
    padding-inline: var(--space-4) var(--space-2);
  }

  .rail__nav a small {
    display: none;
  }

  .business-map {
    grid-template-columns: minmax(15rem, 1fr) minmax(18rem, 1.1fr);
  }

  .map-group--revenue {
    grid-column: 1 / -1;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
  }

  .map-group--revenue .map-axis {
    grid-column: 1 / -1;
  }

  .business-map::after {
    display: none;
  }

  .journey-steps {
    grid-template-columns: repeat(2, 1fr);
  }

  .journey-steps li:nth-child(3) {
    border-inline-start: 0;
    border-block-start: 1px solid var(--color-rule-strong);
  }

  .journey-steps li:nth-child(4) {
    border-block-start: 1px solid var(--color-rule-strong);
  }

  .journey-steps li:nth-child(2)::after {
    display: none;
  }
}

@media (max-width: 60rem) {
  :root {
    --rail-width: 0rem;
  }

  .rail {
    inset: auto 0 0;
    width: 100%;
    height: 4rem;
    flex-direction: row;
    border: 0;
    border-block-start: 1px solid var(--color-rule-strong);
  }

  .rail__brand,
  .rail__progress,
  .rail__print,
  .rail__nav a small {
    display: none;
  }

  .rail__nav {
    display: grid;
    width: 100%;
    grid-template-columns: repeat(6, 1fr);
    grid-template-rows: 1fr;
  }

  .rail__nav a {
    display: grid;
    min-height: 4rem;
    place-items: center;
    padding: 0;
    border: 0;
    border-inline-end: 1px solid var(--color-rule);
  }

  .rail__nav a span {
    font-size: var(--text-md);
  }

  .rail__nav a[aria-current="location"] {
    box-shadow: inset 0 3px 0 var(--color-sage);
  }

  body {
    padding-block-end: calc(4rem + env(safe-area-inset-bottom));
  }

  main,
  .document-footer {
    margin-inline-start: 0;
  }

  .hero {
    min-height: auto;
    grid-template-columns: 1fr;
    align-items: start;
    padding-block-start: var(--space-16);
  }

  .hero h1 {
    max-width: 14ch;
  }

  .hero__meta {
    margin-block-start: var(--space-8);
  }

  .section-head,
  .channel-workbench,
  .discussion-section {
    grid-template-columns: 1fr;
  }

  .section-head--sticky,
  .discussion-head {
    position: static;
  }

  .business-map {
    grid-template-columns: 1fr;
    min-height: auto;
  }

  .business-map::before,
  .business-map::after {
    display: none;
  }

  .platform-node {
    width: min(100%, 27rem);
    justify-self: center;
  }

  .map-group--revenue {
    grid-column: auto;
    grid-template-columns: 1fr;
  }

  .map-group--revenue .map-axis {
    grid-column: auto;
  }

  .map-loop {
    grid-column: auto;
    flex-wrap: wrap;
  }

  .channel-tabs,
  .channel-panel,
  .own-event-note {
    grid-column: 1;
  }

  .own-event-note {
    grid-row: auto;
    padding-inline: 0;
    border-inline-start: 0;
    border-block-start: 1px solid var(--color-rule-strong);
  }

  .fitness-loop {
    grid-template-columns: 1fr;
  }

  .fitness-loop > div {
    align-items: flex-start;
    flex-direction: column;
  }

  .fitness-loop > div span {
    transform: rotate(90deg);
  }

  .fitness-loop > p:last-child {
    grid-column: 1;
  }

  .pricing-principle {
    grid-template-columns: 1fr;
  }

  .equation {
    grid-column: 1;
    align-items: flex-start;
    flex-direction: column;
  }

  .equation b {
    transform: rotate(90deg);
  }

  .next-output {
    grid-column: 1;
  }

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

@media (max-width: 40rem) {
  main > *,
  .document-footer {
    padding-inline: var(--space-4);
  }

  .hero {
    padding-block: var(--space-12);
  }

  .hero h1 {
    font-size: clamp(2.5rem, 11vw, 3rem);
  }

  .hero-title-line {
    font-size: 0.82em;
  }

  .hero__lead br {
    display: none;
  }

  .hero__status {
    align-items: flex-start;
    flex-direction: column;
    margin-block-start: var(--space-8);
  }

  .hero__status span {
    width: 4rem;
  }

  .hero__meta div {
    grid-template-columns: 1fr;
    gap: var(--space-1);
  }

  main > section {
    padding-block: var(--space-12);
  }

  .section-head {
    gap: var(--space-4);
    margin-block-end: var(--space-8);
  }

  .section-head h2,
  .discussion-head h2 {
    font-size: var(--text-2xl);
  }

  .business-map {
    padding: var(--space-4);
    background-size: var(--space-6) var(--space-6);
  }

  .platform-node {
    min-height: 21rem;
    aspect-ratio: auto;
    border-radius: 12rem;
  }

  .map-loop i {
    width: 1rem;
  }

  .channel-tabs {
    grid-template-columns: 1fr;
    border-block-end: 0;
  }

  .channel-tabs button + button {
    border-inline-start: 1px solid var(--color-rule-strong);
    border-block-start: 0;
  }

  .channel-tabs button:last-child {
    border-block-end: 0;
  }

  .channel-panel {
    padding: var(--space-4);
    border-block-start: 1px solid var(--color-sage);
  }

  .channel-panel__intro {
    grid-template-columns: 1fr;
  }

  .channel-panel__spec div {
    grid-template-columns: 1fr;
    gap: var(--space-1);
  }

  .channel-panel__question {
    align-items: flex-start;
    flex-direction: column;
  }

  .journey-steps,
  .revenue-ledgers,
  .guardrail-grid,
  .responsibility-split {
    grid-template-columns: 1fr;
  }

  .journey-steps li + li,
  .journey-steps li:nth-child(3) {
    border-inline-start: 0;
    border-block-start: 1px solid var(--color-rule-strong);
  }

  .journey-steps li:not(:last-child)::after {
    inset-block: auto -0.45rem;
    inset-inline: 50% auto;
    transform: rotate(135deg);
  }

  .guardrail-item:nth-child(odd) {
    border-inline-end: 0;
  }

  .guardrail-item--wide {
    grid-column: auto;
  }

  .decision-list li {
    grid-template-columns: 3rem 1fr;
  }
}

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

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

@media print {
  @page {
    size: A4 landscape;
    margin: 10mm;
  }

  body {
    padding: 0;
    background: var(--color-paper);
    font-size: 9pt;
  }

  .rail,
  .skip-link {
    display: none !important;
  }

  main,
  .document-footer {
    margin: 0;
  }

  main > *,
  .document-footer {
    max-width: none;
    padding-inline: 0;
  }

  .hero {
    min-height: 175mm;
    page-break-after: always;
  }

  main > section {
    break-before: page;
    break-inside: avoid;
    padding-block: 8mm;
  }

  .section-head--sticky,
  .discussion-head {
    position: static;
  }

  .business-map {
    min-height: 145mm;
    print-color-adjust: exact;
    -webkit-print-color-adjust: exact;
  }

  .discussion-section {
    background: var(--color-ink) !important;
    print-color-adjust: exact;
    -webkit-print-color-adjust: exact;
  }

  .document-footer {
    break-before: page;
  }
}