:root {
  color-scheme: light;
  --canvas: #f6f8f7;
  --surface: #ffffff;
  --subtle-surface: #f9fbfa;
  --muted-surface: #e9efed;
  --ink: #10211d;
  --text: #263833;
  --muted-text: #52635e;
  --divider: #cad4d1;
  --control-border: #7b8b86;
  --brand: #0f766e;
  --brand-strong: #115e59;
  --brand-soft: #ccfbf1;
  --brand-soft-text: #134e4a;
  --focus: #005fcc;
  --focus-on-dark: #ccfbf1;
  --success: #15803d;
  --success-soft: #edf9f0;
  --warning: #93400a;
  --warning-soft: #fff0dc;
  --error: #b91c1c;
  --error-soft: #fee9e9;
  --information: #4338ca;
  --information-soft: #e0e7ff;
  --reward: #f59e0b;
  --reward-soft: #fff3d6;
  --reward-ink: #2a1600;
  --display: "Bitstream Charter", Georgia, "Times New Roman", serif;
  --body: "Ubuntu Sans", "Segoe UI", Arial, sans-serif;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  --page-padding: clamp(1rem, 4vw, 4.75rem);
  --content-width: 90rem;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--canvas);
  color: var(--text);
  font: 1rem/1.6 var(--body);
}

a {
  color: inherit;
}

:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 4px;
}

.hero-section a:focus-visible,
.verification-section a:focus-visible,
.showcase-footer a:focus-visible {
  outline-color: var(--focus-on-dark);
}

.skip-link {
  position: fixed;
  z-index: 50;
  top: 0.75rem;
  left: 0.75rem;
  padding: 0.7rem 1rem;
  background: var(--surface);
  color: var(--ink);
  transform: translateY(-180%);
}

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

.showcase-header,
main,
.showcase-footer {
  width: min(100%, var(--content-width));
  margin-inline: auto;
}

.showcase-header {
  display: grid;
  min-height: 4.5rem;
  grid-template-columns: auto 1fr auto;
  gap: clamp(1.25rem, 2.5vw, 2.5rem);
  align-items: center;
  padding: 0.5rem var(--page-padding);
  background: var(--surface);
  border-bottom: 1px solid var(--divider);
}

.project-identity {
  display: inline-flex;
  min-height: 2.75rem;
  align-items: center;
  gap: 0.75rem;
  color: var(--ink);
  font-size: 1.08rem;
  font-weight: 760;
  text-decoration: none;
}

.section-nav {
  display: flex;
  justify-content: center;
  gap: clamp(0.1rem, 0.7vw, 0.75rem);
}

.section-nav a,
.header-link {
  display: inline-flex;
  min-height: 2.75rem;
  align-items: center;
  padding: 0.4rem 0.6rem;
  border-bottom: 2px solid transparent;
  color: var(--text);
  font-size: 0.95rem;
  text-decoration: none;
}

.section-nav a:hover,
.header-link:hover {
  color: var(--brand-strong);
  border-color: var(--brand);
}

.header-link {
  min-height: 3rem;
  padding-inline: 0.9rem;
  background: var(--brand);
  color: var(--surface);
  border: 0;
  border-radius: 7px;
  font-weight: 700;
}

.header-link:hover {
  background: var(--brand-strong);
  color: var(--surface);
  border-color: transparent;
}

.mobile-menu {
  display: none;
}

h1,
h2,
h3,
p,
figure,
dl,
dd,
ol,
ul {
  margin-top: 0;
}

figure {
  margin-right: 0;
  margin-bottom: 0;
  margin-left: 0;
}

h1,
h2,
h3 {
  color: var(--ink);
  font-family: var(--display);
  font-weight: 730;
  letter-spacing: 0;
}

h1 {
  margin-bottom: 1.4rem;
  font-size: clamp(3.25rem, 4.5vw, 4rem);
  line-height: 0.98;
}

h2 {
  margin-bottom: 1.25rem;
  font-size: clamp(2.35rem, 4.4vw, 4.5rem);
  line-height: 1.02;
}

h3 {
  margin-bottom: 0.65rem;
  font-size: clamp(1.25rem, 2vw, 1.75rem);
  line-height: 1.18;
}

p {
  max-width: 70ch;
}

dt,
.panel-topline > span:first-child {
  color: var(--muted-text);
  font: 700 0.76rem/1.4 var(--mono);
}

dd {
  margin: 0.2rem 0 0;
  color: var(--ink);
  font-weight: 700;
}

figcaption {
  margin-top: 0.75rem;
  color: var(--muted-text);
  font-size: 0.86rem;
}

.hero-section {
  padding: clamp(2rem, 3vw, 3.5rem) var(--page-padding) 1.5rem;
  background: var(--ink);
  color: var(--muted-surface);
}

.hero-main {
  display: grid;
  grid-template-columns: minmax(20rem, 0.72fr) minmax(0, 1.18fr);
  gap: clamp(2.5rem, 6vw, 6rem);
  align-items: start;
}

.hero-copy {
  max-width: 31rem;
  padding-top: clamp(0.75rem, 1.5vw, 1.5rem);
}

.hero-copy h1 {
  max-width: 11ch;
  color: var(--subtle-surface);
}

.hero-copy .lead {
  max-width: 30rem;
  margin-bottom: 0;
  color: var(--divider);
  font-size: clamp(1.0625rem, 1.4vw, 1.1875rem);
  line-height: 1.55;
}

.hero-progress-explainer {
  margin-top: clamp(1.5rem, 2vw, 2.25rem);
  padding-block: 0.9rem;
  border-block: 1px solid var(--control-border);
}

.hero-explainer-label {
  display: block;
  margin-bottom: 0.7rem;
  color: var(--divider);
  font: 700 0.75rem/1.4 var(--mono);
}

.hero-progress-explainer ol {
  display: grid;
  gap: 0.55rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.hero-progress-explainer li {
  display: grid;
  grid-template-columns: 1.35rem minmax(0, 1fr);
  gap: 0.6rem;
  align-items: center;
  color: var(--subtle-surface);
  font-size: 0.92rem;
  font-weight: 700;
}

.hero-explainer-step {
  display: grid;
  width: 1.35rem;
  height: 1.35rem;
  place-items: center;
  background: var(--brand);
  color: var(--surface);
  border-radius: 50%;
  font: 700 0.7rem/1 var(--mono);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem 1.25rem;
  align-items: center;
  margin-top: clamp(1.5rem, 2.3vw, 2rem);
}

.hero-actions a {
  display: inline-flex;
  min-height: 3rem;
  align-items: center;
  font-weight: 760;
}

.primary-link {
  padding: 0.65rem 1rem;
  background: var(--brand);
  color: var(--surface);
  border-radius: 7px;
  text-decoration: none;
}

.primary-link:hover {
  background: var(--brand-strong);
}

.secondary-link {
  gap: 0.5rem;
  color: var(--brand-soft);
  text-decoration-thickness: 2px;
  text-underline-offset: 0.3em;
}

.secondary-link:hover {
  color: var(--surface);
}

.hero-visual {
  min-width: 0;
}

.hero-photo img {
  display: block;
  width: 100%;
  height: clamp(28rem, 35vw, 34rem);
  object-fit: cover;
  object-position: center;
  border-radius: 10px;
}

.hero-product {
  position: relative;
  z-index: 1;
  width: min(84%, 38rem);
  margin: -7.5rem 1.25rem 0 auto;
}

.challenge-window {
  padding: clamp(1.25rem, 3vw, 2rem);
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--control-border);
  border-radius: 10px;
}

.challenge-topline,
.challenge-heading,
.progress-caption,
.challenge-footer,
.outcomes-header,
.specimen-heading,
.system-sheet-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.challenge-topline {
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--divider);
}

.challenge-topline > span:first-child,
.challenge-footer span,
.outcomes-header > div > span,
.specimen-heading > span {
  color: var(--muted-text);
  font: 700 0.75rem/1.4 var(--mono);
}

.status-label {
  display: inline-flex;
  min-height: 2rem;
  align-items: center;
  gap: 0.35rem;
  padding: 0.35rem 0.6rem;
  border-radius: 6px;
  font-size: 0.8rem;
  font-weight: 750;
  line-height: 1.25;
}

.status-active {
  background: var(--brand-soft);
  color: var(--brand-soft-text);
}

.status-counted {
  background: var(--success-soft);
  color: var(--success);
}

.challenge-heading {
  align-items: flex-start;
  margin-top: 1.5rem;
}

.challenge-heading h2 {
  margin-bottom: 0.25rem;
  font-size: clamp(2rem, 4vw, 3.75rem);
}

.challenge-heading p {
  margin-bottom: 0;
  color: var(--muted-text);
}

.progress-value {
  display: grid;
  justify-items: end;
  flex: 0 0 auto;
}

.progress-value strong {
  color: var(--brand-strong);
  font: 730 clamp(2rem, 4vw, 3.5rem)/1 var(--display);
}

.progress-value span {
  color: var(--muted-text);
  font-size: 0.82rem;
}

.progress-track {
  height: 0.75rem;
  margin-top: 2rem;
  overflow: hidden;
  background: var(--muted-surface);
  border-radius: 6px;
}

.progress-track span {
  display: block;
  height: 100%;
  background: var(--brand);
}

.progress-caption {
  margin-top: 0.55rem;
  color: var(--muted-text);
  font-size: 0.88rem;
}

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

.activity-record {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0.9rem;
  margin-top: 1.6rem;
  padding-block: 1.15rem;
  border-block: 1px solid var(--divider);
}

.activity-mark {
  display: grid;
  width: 2.2rem;
  height: 2.2rem;
  place-items: center;
  background: var(--success);
  color: var(--surface);
  border-radius: 50%;
  font-weight: 800;
}

.activity-record div:last-child {
  display: grid;
  gap: 0.15rem;
}

.activity-record span,
.activity-record small {
  color: var(--muted-text);
}

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

.challenge-footer {
  margin-top: 1.2rem;
}

.challenge-footer > div {
  display: grid;
  gap: 0.1rem;
}

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

.interface-action {
  min-height: 3rem;
  padding: 0.7rem 1rem;
  background: var(--brand);
  color: var(--surface) !important;
  border-radius: 7px;
  font-family: var(--body) !important;
  font-size: 0.9rem !important;
}

.hero-product figcaption {
  margin-top: 0.55rem;
  color: var(--divider);
  font-size: 0.8rem;
  line-height: 1.4;
}

.hero-facts {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin: clamp(3rem, 6vw, 5rem) 0 0;
  border-top: 1px solid var(--control-border);
}

.hero-facts div {
  padding: 1rem 1.25rem 0 0;
}

.hero-facts div + div {
  padding-left: 1.25rem;
  border-left: 1px solid var(--control-border);
}

.hero-facts dt {
  color: var(--divider);
}

.hero-facts dd {
  margin-top: 0.25rem;
  color: var(--subtle-surface);
  font-size: 0.9rem;
  font-weight: 520;
  line-height: 1.45;
}

.journey-section,
.features-section,
.verification-section,
.principles-section,
.reward-section,
.design-system-section,
.technology-section {
  padding: clamp(4.5rem, 8vw, 8rem) var(--page-padding);
}

.journey-section,
.principles-section,
.design-system-section {
  background: var(--surface);
}

.features-section {
  display: grid;
  grid-template-columns: minmax(18rem, 0.64fr) minmax(0, 1.36fr);
  gap: clamp(3rem, 8vw, 8rem);
  align-items: start;
  background: var(--muted-surface);
}

.features-intro {
  position: sticky;
  top: 2rem;
}

.features-intro h2 {
  max-width: 11ch;
}

.features-intro p {
  max-width: 34rem;
  margin-bottom: 0;
  color: var(--muted-text);
  font-size: 1.08rem;
}

.feature-sequence {
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--control-border);
  list-style: none;
}

.feature-sequence li {
  display: grid;
  grid-template-columns: 2.75rem minmax(11rem, 0.65fr) minmax(16rem, 1fr);
  gap: clamp(1rem, 2.5vw, 2.25rem);
  align-items: start;
  padding: 1.7rem 0;
  border-bottom: 1px solid var(--control-border);
}

.feature-step-number {
  color: var(--brand-strong);
  font: 730 2rem/1 var(--display);
  letter-spacing: 0;
}

.feature-step-heading {
  min-width: 0;
}

.feature-actor {
  display: block;
  margin-bottom: 0.45rem;
  color: var(--muted-text);
  font: 700 0.75rem/1.4 var(--mono);
}

.feature-step-heading h3,
.feature-sequence p {
  margin-bottom: 0;
}

.feature-step-heading h3 {
  font-size: clamp(1.35rem, 2vw, 1.75rem);
}

.feature-sequence p {
  color: var(--muted-text);
}

.feature-sequence li:last-child {
  margin-inline: -1rem;
  padding-inline: 1rem;
  background: var(--ink);
  border-bottom-color: var(--ink);
}

.feature-sequence li:last-child .feature-step-number {
  color: var(--reward);
}

.feature-sequence li:last-child .feature-actor,
.feature-sequence li:last-child p {
  color: var(--divider);
}

.feature-sequence li:last-child h3 {
  color: var(--surface);
}

.section-intro {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(18rem, 0.62fr);
  gap: clamp(2rem, 7vw, 7rem);
  align-items: end;
}

.section-intro h2 {
  max-width: 13ch;
  margin-bottom: 0;
}

.section-intro p {
  margin-bottom: 0.6rem;
  color: var(--muted-text);
  font-size: 1.08rem;
}

.journey-rail {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin: clamp(3rem, 6vw, 5rem) 0 0;
  padding: 0;
  border-top: 2px solid var(--divider);
  list-style: none;
}

.journey-rail li {
  position: relative;
  display: grid;
  gap: 0.15rem;
  padding: 1.25rem 1rem 0 0;
}

.journey-rail li::before {
  position: absolute;
  top: -0.55rem;
  left: 0;
  width: 0.9rem;
  height: 0.9rem;
  background: var(--surface);
  border: 2px solid var(--control-border);
  border-radius: 50%;
  content: "";
}

.journey-rail .is-complete::before {
  background: var(--success);
  border-color: var(--success);
}

.journey-rail .is-current::before {
  background: var(--brand);
  border-color: var(--brand);
  box-shadow: 0 0 0 4px var(--brand-soft);
}

.journey-rail span {
  color: var(--muted-text);
  font-size: 0.85rem;
}

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

.journey-workspace {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(6rem, 0.28fr) minmax(18rem, 0.72fr);
  align-items: center;
  margin-top: clamp(2.5rem, 5vw, 4rem);
  padding: clamp(1.5rem, 4vw, 3.5rem) 0;
  border-block: 1px solid var(--divider);
}

.evidence-panel,
.progress-panel {
  position: relative;
  min-width: 0;
  padding-top: 2.8rem;
}

.evidence-panel {
  padding-right: clamp(1.25rem, 3vw, 2.25rem);
}

.journey-stage-marker {
  position: absolute;
  top: 0;
  left: 0;
  display: grid;
  width: 1.7rem;
  height: 1.7rem;
  place-items: center;
  background: var(--ink);
  color: var(--surface);
  border-radius: 50%;
  font: 700 0.78rem/1 var(--mono);
}

.panel-topline {
  display: flex;
  gap: 1rem;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--divider);
}

.evidence-panel h3 {
  margin: 1.5rem 0 0.2rem;
  font-size: clamp(1.8rem, 3vw, 2.7rem);
}

.activity-date {
  color: var(--muted-text);
}

.evidence-details {
  margin: 1.5rem 0 0;
  border-top: 1px solid var(--divider);
}

.evidence-details div {
  display: grid;
  grid-template-columns: 0.45fr 1fr;
  gap: 1rem;
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--divider);
}

.decision-version {
  display: flex;
  gap: 1rem;
  align-items: center;
  justify-content: space-between;
  margin-top: 1.5rem;
  padding: 0.9rem 1rem;
  background: var(--brand-soft);
  color: var(--brand-soft-text);
  border-radius: 8px;
  font-size: 0.9rem;
}

.connection-line {
  position: relative;
  display: grid;
  min-height: 8rem;
  place-items: center;
}

.connection-line::before {
  position: absolute;
  top: 50%;
  right: 0;
  left: 0;
  height: 2px;
  background: var(--brand);
  content: "";
  transform: translateY(-50%);
}

.connection-line span {
  position: relative;
  z-index: 1;
  display: grid;
  width: 2.7rem;
  height: 2.7rem;
  place-items: center;
  background: var(--brand);
  color: var(--surface);
  border-radius: 50%;
  font-size: 1.35rem;
  font-weight: 750;
  line-height: 1;
}

.progress-panel {
  padding-left: clamp(1.25rem, 2.5vw, 1.75rem);
}

.progress-status {
  display: flex;
  gap: 0.75rem;
  align-items: center;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--divider);
}

.progress-status > div {
  display: grid;
  gap: 0.05rem;
}

.progress-status span:not(.status-dot) {
  color: var(--muted-text);
  font-size: 0.78rem;
}

.progress-status strong {
  color: var(--success);
}

.status-dot {
  width: 0.85rem;
  height: 0.85rem;
  background: var(--success);
  border-radius: 50%;
}

.progress-panel h3 {
  margin-top: 1.4rem;
  color: var(--brand-strong);
  font-size: clamp(2.5rem, 5vw, 4.5rem);
}

.progress-panel p {
  color: var(--muted-text);
}

.progress-checks {
  display: grid;
  gap: 0.7rem;
  margin-top: 1.5rem;
}

.progress-checks span {
  display: grid;
  grid-template-columns: 1.3rem minmax(0, 1fr);
  gap: 0.55rem;
  color: var(--muted-text);
  font-size: 0.9rem;
}

.progress-checks b {
  color: var(--success);
}

.verification-section {
  display: grid;
  grid-template-columns: minmax(18rem, 0.72fr) minmax(0, 1.28fr);
  gap: clamp(3rem, 8vw, 8rem);
  align-items: start;
  background: var(--ink);
  color: var(--divider);
}

.verification-copy h2 {
  max-width: 11ch;
  color: var(--surface);
}

.verification-copy p {
  color: var(--divider);
}

.trust-limit {
  margin: 2rem 0 0;
  padding-top: 1.5rem;
  border-top: 1px solid var(--control-border);
  font-size: 0.92rem;
}

.outcomes-window {
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--control-border);
  border-radius: 10px;
}

.outcomes-header {
  padding: 1.2rem;
  border-bottom: 1px solid var(--divider);
}

.outcomes-header h3 {
  margin: 0.2rem 0 0;
}

.outcomes-meta {
  color: var(--muted-text);
  font: 700 0.78rem/1.4 var(--mono);
}

.outcome-row {
  display: grid;
  grid-template-columns: 2.25rem minmax(0, 1fr) auto;
  gap: 1rem;
  align-items: center;
  padding: 1.1rem 1.2rem;
  border-bottom: 1px solid var(--divider);
}

.outcome-row:last-child {
  border-bottom: 0;
}

.outcome-symbol {
  display: grid;
  width: 2.1rem;
  height: 2.1rem;
  place-items: center;
  border: 2px solid currentColor;
  border-radius: 50%;
  font-weight: 800;
}

.outcome-row > div {
  display: grid;
  gap: 0.15rem;
}

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

.outcome-row div span {
  color: var(--muted-text);
  font-size: 0.9rem;
}

.outcome-row small {
  min-width: 7rem;
  padding: 0.25rem 0.45rem;
  border-radius: 6px;
  text-align: center;
  font-weight: 750;
}

.outcome-accepted {
  color: var(--success);
}

.outcome-accepted small {
  background: var(--success-soft);
}

.outcome-action,
.outcome-held {
  color: var(--warning);
}

.outcome-action small,
.outcome-held small {
  background: var(--warning-soft);
}

.outcome-rejected {
  color: var(--error);
}

.outcome-rejected small {
  background: var(--error-soft);
}

.outcomes-figure figcaption {
  color: var(--divider);
}

.principles-section {
  display: grid;
  grid-template-columns: minmax(18rem, 0.72fr) minmax(0, 1.28fr);
  gap: clamp(3rem, 8vw, 8rem);
  align-items: start;
}

.principles-section > h2 {
  position: sticky;
  top: 2rem;
  max-width: 11ch;
}

.principles-list {
  border-top: 1px solid var(--control-border);
}

.principles-list article {
  display: grid;
  grid-template-columns: 2.5rem minmax(11rem, 0.72fr) minmax(15rem, 1fr);
  gap: 1.25rem;
  padding: 1.6rem 0;
  border-bottom: 1px solid var(--control-border);
}

.principle-index {
  color: var(--brand-strong);
  font: 730 1.5rem/1 var(--display);
}

.principles-list h3,
.principles-list p {
  margin-bottom: 0;
}

.principles-list p {
  color: var(--muted-text);
}

.reward-section {
  background: var(--muted-surface);
}

.reward-copy {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(18rem, 0.65fr);
  gap: clamp(2rem, 7vw, 7rem);
  align-items: end;
}

.reward-copy h2 {
  max-width: 12ch;
  margin-bottom: 0;
}

.reward-copy p {
  margin-bottom: 0.6rem;
  color: var(--muted-text);
  font-size: 1.08rem;
}

.truth-chain {
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  margin: clamp(3rem, 6vw, 5rem) 0 0;
  padding: 0;
  border-block: 1px solid var(--control-border);
  list-style: none;
}

.truth-chain li {
  position: relative;
  display: grid;
  align-content: start;
  gap: 0.3rem;
  min-height: 12rem;
  padding: 1.4rem 1rem;
}

.truth-chain li + li {
  border-left: 1px solid var(--control-border);
}

.truth-chain li + li::before {
  position: absolute;
  top: 2rem;
  left: -0.45rem;
  width: 0.7rem;
  height: 0.7rem;
  background: var(--muted-surface);
  border-top: 2px solid var(--brand);
  border-right: 2px solid var(--brand);
  content: "";
  transform: rotate(45deg);
}

.truth-chain span {
  color: var(--muted-text);
  font: 700 0.75rem/1.4 var(--mono);
}

.truth-chain strong {
  color: var(--ink);
  font: 700 1.25rem/1.2 var(--display);
}

.truth-chain small {
  margin-top: 0.45rem;
  color: var(--muted-text);
  line-height: 1.5;
}

.truth-chain .truth-complete {
  background: var(--brand-soft);
}

.truth-chain .truth-eligible {
  background: var(--reward-soft);
}

.truth-chain .truth-eligible strong {
  color: var(--reward-ink);
}

.design-system-section {
  border-top: 1px solid var(--divider);
}

.design-system-intro {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(18rem, 0.75fr);
  gap: clamp(2rem, 7vw, 7rem);
  align-items: end;
}

.design-system-intro h2 {
  max-width: 12ch;
  margin-bottom: 0;
}

.design-system-intro p {
  margin-bottom: 0;
  color: var(--muted-text);
}

.design-system-intro .concept-scope {
  margin-top: 1rem;
  font: 600 0.78rem/1.5 var(--mono);
}

.system-sheet {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: clamp(3rem, 6vw, 5rem);
  border: 1px solid var(--control-border);
}

.system-sheet > article {
  min-width: 0;
  padding: clamp(1.25rem, 3vw, 2rem);
}

.type-specimen,
.colour-specimen {
  border-bottom: 1px solid var(--divider);
}

.type-specimen,
.component-specimen {
  border-right: 1px solid var(--divider);
}

.specimen-heading {
  align-items: flex-start;
}

.specimen-heading h3 {
  margin-bottom: 0;
}

.type-sample {
  margin-top: 2rem;
  color: var(--brand-strong);
  font: 730 clamp(4rem, 10vw, 8rem)/0.9 var(--display);
  letter-spacing: 0;
}

.display-sample {
  margin: 1.2rem 0 0.8rem;
  color: var(--ink);
  font: 700 clamp(1.7rem, 3vw, 2.7rem)/1.05 var(--display);
}

.body-sample {
  color: var(--muted-text);
}

.type-scale {
  margin: 1.5rem 0 0;
  border-top: 1px solid var(--divider);
}

.type-scale div,
.system-rules > dl > div {
  display: grid;
  grid-template-columns: 0.65fr 1fr;
  gap: 1rem;
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--divider);
}

.colour-foundation {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: 2rem;
  border: 1px solid var(--divider);
}

.colour-chip {
  display: grid;
  min-height: 8.5rem;
  align-content: space-between;
  padding: 1rem;
}

.colour-chip + .colour-chip {
  border-left: 1px solid var(--divider);
}

.colour-chip span {
  font-weight: 750;
}

.colour-chip code {
  font-family: var(--mono);
  font-size: 0.78rem;
}

.colour-ink {
  background: var(--ink);
  color: var(--surface);
}

.colour-canvas {
  background: var(--canvas);
  color: var(--ink);
}

.colour-action {
  background: var(--brand);
  color: var(--surface);
}

.semantic-colours {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin: 1.5rem 0 0;
  border-top: 1px solid var(--divider);
}

.semantic-colours div {
  padding: 0.8rem 0;
  border-bottom: 1px solid var(--divider);
}

.semantic-colours div:nth-child(even) {
  padding-left: 1rem;
  border-left: 1px solid var(--divider);
}

.semantic-success dt,
.semantic-success dd {
  color: var(--success);
}

.semantic-warning dt,
.semantic-warning dd {
  color: var(--warning);
}

.semantic-error dt,
.semantic-error dd {
  color: var(--error);
}

.semantic-reward dt,
.semantic-reward dd {
  color: var(--reward-ink);
}

.action-specimens {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 2rem;
}

.action-specimens span {
  display: inline-flex;
  min-height: 3rem;
  align-items: center;
  padding: 0.65rem 0.9rem;
  border-radius: 7px;
  font-size: 0.88rem;
  font-weight: 750;
}

.action-primary {
  background: var(--brand);
  color: var(--surface);
}

.action-secondary {
  background: var(--surface);
  color: var(--brand-strong);
  border: 1px solid var(--brand);
}

.action-focus {
  background: var(--surface);
  color: var(--ink);
  outline: 3px solid var(--focus);
  outline-offset: 2px;
}

.action-disabled {
  background: var(--muted-surface);
  color: var(--muted-text);
}

.feedback-specimen {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0.9rem;
  margin-top: 2rem;
  padding: 1rem;
  background: var(--warning-soft);
  color: var(--warning);
  border-radius: 8px;
}

.feedback-mark {
  display: grid;
  width: 2rem;
  height: 2rem;
  place-items: center;
  border: 2px solid currentColor;
  border-radius: 50%;
  font-weight: 800;
}

.feedback-specimen > div {
  display: grid;
  gap: 0.15rem;
}

.feedback-specimen span:last-child {
  font-size: 0.9rem;
}

.system-rules > dl {
  margin: 2rem 0 0;
  border-top: 1px solid var(--divider);
}

.system-rules > dl > div:last-child {
  border-bottom: 0;
}

.system-sheet-footer {
  grid-column: 1 / -1;
  padding: 1rem clamp(1.25rem, 3vw, 2rem);
  background: var(--ink);
  color: var(--surface);
  font: 600 0.78rem/1.4 var(--mono);
}

.technology-section {
  background: var(--canvas);
}

.technology-copy {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(18rem, 0.75fr);
  gap: clamp(2rem, 7vw, 7rem);
  align-items: end;
}

.technology-copy h2 {
  max-width: 12ch;
  margin-bottom: 0;
}

.technology-copy p {
  margin-bottom: 0.5rem;
  color: var(--muted-text);
}

.technology-copy .architecture-scope {
  margin-top: 1rem;
  font: 600 0.78rem/1.5 var(--mono);
}

.architecture-map {
  --diagram-edge: var(--brand);
  position: relative;
  margin-top: clamp(3rem, 6vw, 5rem);
  overflow: hidden;
  background: var(--subtle-surface);
  border-block: 1px solid var(--control-border);
}

.architecture-diagram__canvas {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.75rem;
  min-height: 38rem;
  padding: clamp(1.25rem, 3vw, 2.5rem);
}

.architecture-node-card {
  position: relative;
  z-index: 2;
  display: grid;
  align-content: center;
  gap: 0.35rem;
  min-width: 0;
  padding: clamp(1.25rem, 2.5vw, 2rem);
  background: var(--surface);
  border: 1px solid var(--control-border);
  border-radius: 10px;
}

.architecture-node-card--clients,
.architecture-node-card--server {
  grid-row: 1 / span 2;
}

.architecture-node-card--clients {
  grid-column: 1;
}

.architecture-node-card--server {
  grid-column: 2;
}

.architecture-node-card > span {
  color: var(--muted-text);
  font: 700 0.75rem/1.4 var(--mono);
}

.architecture-node-card > strong {
  color: var(--ink);
  font: 700 1.35rem/1.2 var(--display);
}

.architecture-node-card > small {
  color: var(--muted-text);
  line-height: 1.5;
}

.architecture-node-card--server {
  background: var(--ink);
  border-color: var(--ink);
}

.architecture-node-card--server > span,
.architecture-node-card--server > small {
  color: var(--divider);
}

.architecture-node-card--server > strong {
  color: var(--surface);
}

.architecture-map[data-ready="true"] {
  height: 46rem;
}

.architecture-map[data-ready="true"] .architecture-diagram__canvas {
  position: relative;
  display: block;
  width: 100%;
  height: 100%;
  min-height: 0;
  padding: 0;
}

.architecture-map[data-ready="true"] .architecture-node-card {
  position: absolute;
  top: var(--diagram-y);
  left: var(--diagram-x);
  width: min(16rem, 26%);
  min-height: 9.5rem;
  padding: 1rem;
  cursor: grab;
  touch-action: none;
  transform: translate(var(--diagram-drag-x), var(--diagram-drag-y));
  user-select: none;
}

.architecture-map[data-ready="true"] .architecture-node-card[data-dragging="true"] {
  cursor: grabbing;
}

.architecture-node-card:focus-visible {
  z-index: 3;
  outline: 3px solid var(--focus);
  outline-offset: 3px;
}

.architecture-diagram__edges {
  display: none;
}

.architecture-map[data-ready="true"] .architecture-diagram__edges {
  position: absolute;
  z-index: 1;
  display: block;
  width: 100%;
  height: 100%;
  overflow: visible;
  pointer-events: none;
}

.architecture-diagram__edge {
  fill: none;
  stroke: var(--diagram-edge);
  stroke-linecap: round;
  stroke-width: 2;
}

.architecture-diagram__arrowhead {
  fill: var(--diagram-edge);
}

.architecture-diagram__toolbar {
  display: none;
}

.architecture-map[data-ready="true"] .architecture-diagram__toolbar {
  position: absolute;
  z-index: 4;
  bottom: 1rem;
  left: 1rem;
  display: block;
}

.architecture-diagram__toolbar button {
  min-height: 2.75rem;
  padding: 0.65rem 0.9rem;
  background: var(--surface);
  color: var(--ink);
  border: 1px solid var(--control-border);
  border-radius: 8px;
  font: 700 0.78rem/1 var(--body);
  cursor: pointer;
}

.architecture-diagram__toolbar button:hover {
  background: var(--brand-soft);
}

.architecture-diagram__toolbar button:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 3px;
}

.architecture-help {
  display: none;
  margin: 1rem 0 0;
  color: var(--muted-text);
  font-size: 0.9rem;
}

.architecture-map[data-ready="true"] + .architecture-help {
  display: block;
}

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

.trust-boundaries {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: clamp(2.5rem, 5vw, 4rem);
  border-top: 1px solid var(--control-border);
}

.trust-boundaries article {
  padding: 1.5rem 1.5rem 0 0;
}

.trust-boundaries article + article {
  padding-left: 1.5rem;
  border-left: 1px solid var(--control-border);
}

.trust-boundaries h3 {
  font-size: 1.25rem;
}

.trust-boundaries p {
  margin-bottom: 0;
  color: var(--muted-text);
}

.showcase-footer {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 2rem;
  align-items: center;
  padding: 1.5rem var(--page-padding);
  background: var(--ink);
  color: var(--surface);
}

.showcase-footer > span {
  font: 750 0.9rem/1.4 var(--mono);
}

.showcase-footer p {
  margin-bottom: 0;
  color: var(--divider);
  text-align: center;
}

.showcase-footer a {
  min-height: 2.75rem;
  align-content: center;
  font-weight: 750;
  text-underline-offset: 0.25em;
}

@media (max-width: 71rem) {
  .showcase-header {
    grid-template-columns: auto 1fr auto;
  }

  .section-nav {
    display: none;
  }

  .mobile-menu {
    position: relative;
    display: block;
    justify-self: end;
  }

  .mobile-menu summary {
    display: grid;
    min-width: 3.75rem;
    min-height: 2.75rem;
    place-items: center;
    border: 1px solid var(--control-border);
    border-radius: 7px;
    color: var(--ink);
    cursor: pointer;
    font-weight: 700;
    list-style: none;
  }

  .mobile-menu summary::-webkit-details-marker {
    display: none;
  }

  .mobile-menu nav {
    position: absolute;
    z-index: 20;
    top: calc(100% + 0.5rem);
    right: 0;
    display: grid;
    min-width: 13rem;
    padding: 0.5rem;
    background: var(--surface);
    border: 1px solid var(--control-border);
    border-radius: 8px;
  }

  .mobile-menu:not([open]) nav {
    display: none;
  }

  .mobile-menu nav a {
    display: flex;
    min-height: 2.75rem;
    align-items: center;
    padding: 0.55rem 0.7rem;
    color: var(--ink);
    text-decoration: none;
  }

  .mobile-menu nav a:hover {
    background: var(--brand-soft);
  }

  .hero-main,
  .features-section,
  .verification-section,
  .principles-section {
    grid-template-columns: minmax(0, 1fr);
  }

  .hero-copy {
    max-width: 42rem;
  }

  .features-intro,
  .principles-section > h2 {
    position: static;
  }

  .features-intro h2,
  .verification-copy h2,
  .principles-section > h2 {
    max-width: 14ch;
  }

  .feature-sequence li {
    grid-template-columns: 2.75rem minmax(12rem, 0.65fr) minmax(0, 1fr);
  }

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

  .truth-chain li:nth-child(5) {
    border-left: 0;
  }

  .truth-chain li:nth-child(n + 5) {
    border-top: 1px solid var(--control-border);
  }

  .truth-chain li:nth-child(5)::before {
    display: none;
  }

}

@media (max-width: 44rem) {
  .showcase-header {
    grid-template-columns: 1fr auto;
    gap: 1rem;
    padding-block: 0.75rem;
  }

  .header-link {
    display: none;
  }

  h1 {
    font-size: clamp(2.75rem, 14vw, 3.5rem);
  }

  h2 {
    font-size: clamp(2.1rem, 10vw, 3rem);
  }

  .hero-section {
    padding-top: 2rem;
  }

  .hero-main {
    gap: 2.5rem;
  }

  .hero-photo img {
    height: 18rem;
  }

  .hero-product {
    width: 92%;
    margin: -4rem 0 0 auto;
  }

  .hero-actions {
    align-items: stretch;
    flex-direction: column;
  }

  .hero-actions a {
    justify-content: center;
  }

  .challenge-heading,
  .challenge-footer {
    align-items: flex-start;
    flex-direction: column;
  }

  .progress-value {
    justify-items: start;
  }

  .interface-action {
    width: 100%;
    justify-content: center;
  }

  .hero-facts {
    display: flex;
    flex-wrap: wrap;
    gap: 0.25rem 0;
    padding-top: 0.8rem;
  }

  .hero-facts div {
    display: flex;
    padding: 0;
  }

  .hero-facts div + div {
    padding-left: 0;
    border-left: 0;
  }

  .hero-facts div + div::before {
    margin-inline: 0.45rem;
    color: var(--control-border);
    content: "·";
  }

  .hero-facts dd {
    display: none;
  }

  .journey-section,
  .features-section,
  .verification-section,
  .principles-section,
  .reward-section,
  .design-system-section,
  .technology-section {
    padding-block: 4rem;
  }

  .feature-sequence li {
    grid-template-columns: 2.25rem minmax(0, 1fr);
    gap: 0.75rem 1rem;
    padding-block: 1.4rem;
  }

  .feature-step-number {
    font-size: 1.65rem;
  }

  .feature-sequence p {
    grid-column: 2;
  }

  .section-intro,
  .reward-copy,
  .design-system-intro,
  .technology-copy {
    grid-template-columns: minmax(0, 1fr);
    align-items: start;
  }

  .section-intro h2,
  .reward-copy h2,
  .design-system-intro h2,
  .technology-copy h2 {
    margin-bottom: 1.25rem;
  }

  .journey-rail {
    grid-template-columns: 1fr;
    border-top: 0;
    border-left: 2px solid var(--divider);
  }

  .journey-rail li {
    padding: 0 0 1.5rem 1.25rem;
  }

  .journey-rail li::before {
    top: 0.25rem;
    left: -0.55rem;
  }

  .journey-workspace {
    grid-template-columns: minmax(0, 1fr);
    gap: 0;
    padding: 1.25rem 0;
  }

  .connection-line {
    width: 100%;
    min-height: 5rem;
  }

  .connection-line::before {
    top: 0;
    bottom: 0;
    left: 50%;
    width: 2px;
    height: auto;
    transform: translateX(-50%);
  }

  .connection-line span {
    transform: rotate(90deg);
  }

  .evidence-panel,
  .progress-panel {
    padding-top: 2.8rem;
  }

  .evidence-panel {
    padding-right: 0;
  }

  .progress-panel {
    padding-left: 0;
  }

  .evidence-details div {
    grid-template-columns: 1fr;
    gap: 0.1rem;
  }

  .decision-version {
    align-items: flex-start;
    flex-direction: column;
    gap: 0.2rem;
  }

  .outcome-row {
    grid-template-columns: 2.25rem minmax(0, 1fr);
  }

  .outcome-row small {
    grid-column: 2;
    width: fit-content;
  }

  .principles-list article {
    grid-template-columns: 2.5rem minmax(0, 1fr);
    gap: 0.75rem 1rem;
  }

  .principles-list p {
    grid-column: 2;
  }

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

  .truth-chain li {
    min-height: 0;
    padding: 1.25rem 1rem 1.25rem 2rem;
    border-left: 0 !important;
  }

  .truth-chain li + li {
    border-top: 1px solid var(--control-border);
  }

  .truth-chain li + li::before {
    top: -0.45rem;
    left: 1rem;
    background: var(--muted-surface);
    transform: rotate(135deg);
  }

  .truth-chain li:nth-child(5)::before {
    display: block;
  }

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

  .type-specimen,
  .component-specimen {
    border-right: 0;
  }

  .colour-specimen,
  .component-specimen {
    border-bottom: 1px solid var(--divider);
  }

  .colour-foundation {
    grid-template-columns: 1fr;
  }

  .colour-chip {
    min-height: 6.5rem;
  }

  .colour-chip + .colour-chip {
    border-top: 1px solid var(--divider);
    border-left: 0;
  }

  .semantic-colours,
  .system-rules > dl > div {
    grid-template-columns: 1fr;
  }

  .semantic-colours div:nth-child(even) {
    padding-left: 0;
    border-left: 0;
  }

  .system-sheet-footer {
    align-items: flex-start;
    flex-direction: column;
  }

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

  .architecture-node-card--clients,
  .architecture-node-card--server {
    grid-row: auto;
    grid-column: auto;
  }

  .architecture-map[data-ready="true"] {
    height: 75rem;
  }

  .architecture-map[data-ready="true"] .architecture-node-card {
    width: 84%;
    min-height: 9.5rem;
    padding: 0.9rem;
  }

  .architecture-node-card > strong {
    font-size: 1.1rem;
  }

  .architecture-node-card > small {
    font-size: 0.82rem;
  }

  .trust-boundaries {
    grid-template-columns: 1fr;
  }

  .trust-boundaries article,
  .trust-boundaries article + article {
    padding: 1.5rem 0;
    border-bottom: 1px solid var(--control-border);
    border-left: 0;
  }

  .showcase-footer {
    grid-template-columns: 1fr;
    gap: 0.75rem;
  }

  .showcase-footer p {
    text-align: left;
  }
}

@media (max-width: 22rem) {
  .hero-section {
    padding: 1.75rem 1.25rem 0.75rem;
  }

  .challenge-window {
    padding: 1rem;
  }

  .challenge-topline,
  .panel-topline,
  .outcomes-header {
    align-items: flex-start;
    flex-direction: column;
  }
}

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