/* Hallmark · macrostructure: Ecosystem Index · genre: editorial · theme: studied-DNA (source: https://pvrack.com/) · tone: premium-industrial · anchor hue: warm-gold · nav: N1b · footer: Ft3 index + statement close · enrichment: E8 generated photography, post-processed · contrast: pass (40–41) · slop: pass (42–45) · honest: pass (46) · chrome: pass (47) · tokens: pass (48) · responsive: pass (49) · icons: pass (30) · mobile: pass (34, 49, 50–57) */
/* Hallmark · pre-emit critique: P5 H5 E5 S5 R5 V5 */
@import url("/tokens.css?v=20260822e");

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

html,
body {
  margin: 0;
  overflow-x: clip;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + var(--space-md));
}

body {
  color: var(--color-ink-2);
  background: var(--color-paper);
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

body.nav-open {
  overflow: hidden;
}

img {
  display: block;
  max-width: 100%;
  height: auto;
}

a {
  color: inherit;
  text-decoration: none;
}

button,
input {
  font: inherit;
}

button {
  color: inherit;
}

ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

h1,
h2,
h3,
h4,
p,
figure {
  margin: 0;
}

h1,
h2,
h3,
.display {
  min-width: 0;
  overflow-wrap: anywhere;
  color: var(--color-ink);
  font-family: var(--font-display);
  font-style: normal;
  font-weight: 400;
  line-height: 1.08;
}

h1 {
  font-size: var(--text-display);
  letter-spacing: -0.045em;
}

h2 {
  font-size: clamp(2.2rem, 4.2vw, 4.35rem);
  letter-spacing: -0.035em;
}

h3 {
  font-size: clamp(1.35rem, 2.1vw, 2rem);
  letter-spacing: -0.02em;
}

.container {
  width: min(var(--page-max), calc(100% - (var(--page-gutter) * 2)));
  margin-inline: auto;
}

.skip-link {
  position: fixed;
  top: var(--space-sm);
  left: var(--space-sm);
  z-index: calc(var(--z-sticky-nav) + 1);
  padding: var(--space-xs) var(--space-sm);
  color: var(--color-accent-ink);
  background: var(--color-accent);
  transform: translateY(-180%);
}

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

.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: var(--z-sticky-nav);
  min-height: var(--header-height);
  color: var(--color-ink);
  background: color-mix(in oklch, var(--color-paper) 93%, var(--color-transparent));
  border-bottom: var(--rule-hair) solid color-mix(in oklch, var(--color-rule) 45%, var(--color-transparent));
  backdrop-filter: blur(18px) saturate(130%);
  transition: background-color var(--dur-short) var(--ease-out), box-shadow var(--dur-short) var(--ease-out), border-color var(--dur-short) var(--ease-out);
}

.site-header.scrolled {
  background: color-mix(in oklch, var(--color-paper) 98%, var(--color-transparent));
  border-bottom-color: var(--color-rule);
  box-shadow: var(--shadow-soft);
}

.header-inner {
  display: grid;
  grid-template-columns: minmax(9rem, 1fr) auto minmax(9rem, 1fr);
  align-items: center;
  gap: var(--space-lg);
  width: min(88rem, calc(100% - (var(--page-gutter) * 2)));
  min-height: var(--header-height);
  margin-inline: auto;
}

.logo {
  display: inline-flex;
  align-items: center;
  width: fit-content;
  min-height: 2.75rem;
}

.logo img {
  width: 8.75rem;
  height: auto;
}

.nav-wrap {
  min-width: 0;
}

.nav-main {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--space-3xs);
}

.nav-item {
  position: relative;
}

.nav-link,
.nav-item > .nav-link {
  display: inline-flex;
  align-items: center;
  min-height: 2.75rem;
  padding-inline: var(--space-xs);
  color: var(--color-ink-2);
  background: var(--color-transparent);
  border: 0;
  font-size: var(--text-sm);
  font-weight: 600;
  white-space: nowrap;
  border-radius: var(--radius-xs);
  cursor: pointer;
  transition: color var(--dur-fast) var(--ease-out), background-color var(--dur-fast) var(--ease-out);
}

.nav-link:hover,
.nav-item.is-open > .nav-link {
  color: var(--color-ink);
  background: var(--color-paper-2);
}

.has-dropdown > .nav-link::after {
  content: "";
  width: 0.38rem;
  height: 0.38rem;
  margin-left: var(--space-2xs);
  border-right: var(--rule-hair) solid currentColor;
  border-bottom: var(--rule-hair) solid currentColor;
  transform: translateY(-0.12rem) rotate(45deg);
}

.dropdown {
  position: absolute;
  top: calc(100% + var(--space-2xs));
  left: 50%;
  width: min(25rem, 86vi);
  padding: var(--space-sm);
  visibility: hidden;
  opacity: 0;
  color: var(--color-ink-2);
  background: var(--color-paper);
  border: var(--rule-hair) solid var(--color-rule);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-float);
  transform: translate(-50%, -0.5rem);
  transition: opacity var(--dur-short) var(--ease-out), transform var(--dur-short) var(--ease-out), visibility var(--dur-short);
}

.nav-item:hover .dropdown,
.nav-item.is-open .dropdown {
  visibility: visible;
  opacity: 1;
  transform: translate(-50%, 0);
}

.nav-trigger[aria-expanded="true"]::after {
  transform: translateY(0.1rem) rotate(225deg);
}

.nav-trigger:active {
  transform: translateY(1px);
}

.nav-trigger:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.dropdown li + li {
  margin-top: var(--space-3xs);
}

.dropdown a {
  display: grid;
  gap: var(--space-3xs);
  padding: var(--space-xs);
  border-radius: var(--radius-xs);
  transition: background-color var(--dur-fast) var(--ease-out), color var(--dur-fast) var(--ease-out);
}

.dropdown a:hover,
.dropdown a:focus-visible {
  color: var(--color-ink);
  background: var(--color-paper-2);
}

.dropdown strong {
  color: var(--color-ink);
  font-size: var(--text-sm);
}

.dropdown span {
  color: var(--color-muted);
  font-size: var(--text-xs);
}

.header-actions {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: var(--space-xs);
}

.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 2.75rem;
  height: 2.75rem;
  padding: 0;
  background: var(--color-transparent);
  border: var(--rule-hair) solid var(--color-rule);
  border-radius: var(--radius-sm);
  cursor: pointer;
}

.nav-toggle span,
.nav-toggle::before,
.nav-toggle::after {
  content: "";
  display: block;
  width: 1.15rem;
  height: var(--rule-hair);
  background: var(--color-ink);
  transition: transform var(--dur-short) var(--ease-out), opacity var(--dur-short) var(--ease-out);
}

.nav-toggle {
  flex-direction: column;
  gap: var(--space-3xs);
}

.nav-toggle[aria-expanded="true"] span {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"]::before {
  transform: translateY(0.34rem) rotate(45deg);
}

.nav-toggle[aria-expanded="true"]::after {
  transform: translateY(-0.34rem) rotate(-45deg);
}

.nav-mobile {
  display: none;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.875rem;
  padding: var(--space-xs) var(--space-sm);
  color: var(--color-ink);
  font-weight: 700;
  line-height: 1;
  white-space: nowrap;
  border: var(--rule-hair) solid var(--color-rule);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: transform var(--dur-fast) var(--ease-out), background-color var(--dur-short) var(--ease-out), border-color var(--dur-short) var(--ease-out), color var(--dur-short) var(--ease-out), box-shadow var(--dur-short) var(--ease-out), opacity var(--dur-short) var(--ease-out);
}

.btn-primary {
  color: var(--color-accent-ink);
  background: var(--color-accent);
  border-color: var(--color-accent);
}

.btn-primary:hover,
.btn-primary.is-hover {
  background: color-mix(in oklch, var(--color-accent) 88%, var(--color-paper));
  border-color: color-mix(in oklch, var(--color-accent) 88%, var(--color-paper));
}

.btn-secondary {
  color: var(--color-night-ink);
  background: color-mix(in oklch, var(--color-night) 45%, var(--color-transparent));
  border-color: color-mix(in oklch, var(--color-night-ink) 50%, var(--color-transparent));
}

.btn-secondary:hover,
.btn-secondary.is-hover {
  color: var(--color-ink);
  background: var(--color-paper);
  border-color: var(--color-paper);
}

.btn:active,
.btn.is-active {
  transform: translateY(0.0625rem);
}

.btn[aria-disabled="true"],
.btn.is-disabled {
  opacity: 0.55;
  cursor: not-allowed;
  pointer-events: none;
}

.btn[data-state="loading"] {
  cursor: wait;
}

.btn[data-state="error"] {
  color: var(--color-night-ink);
  background: var(--color-error);
  border-color: var(--color-error);
}

.btn[data-state="success"] {
  color: var(--color-night-ink);
  background: var(--color-success);
  border-color: var(--color-success);
}

:focus-visible {
  outline: 0.125rem solid var(--color-focus);
  outline-offset: 0.18rem;
}

a:active {
  opacity: 0.78;
}

a[aria-disabled="true"] {
  opacity: 0.55;
  cursor: not-allowed;
  pointer-events: none;
}

.hero {
  position: relative;
  display: flex;
  align-items: flex-end;
  min-height: clamp(41rem, 88svh, 48rem);
  overflow: clip;
  color: var(--color-night-ink);
  background: var(--color-night);
}

.hero-media,
.hero-media picture,
.hero-media img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.hero-media img {
  object-fit: cover;
  object-position: center center;
}

.hero-media::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, color-mix(in oklch, var(--color-night) 96%, var(--color-transparent)) 0%, color-mix(in oklch, var(--color-night) 84%, var(--color-transparent)) 38%, color-mix(in oklch, var(--color-night) 24%, var(--color-transparent)) 72%, color-mix(in oklch, var(--color-night) 12%, var(--color-transparent)) 100%),
    linear-gradient(0deg, color-mix(in oklch, var(--color-night) 72%, var(--color-transparent)) 0%, var(--color-transparent) 55%);
}

.hero-content {
  position: relative;
  z-index: var(--z-base);
  padding-block: calc(var(--header-height) + var(--space-2xl)) var(--space-2xl);
}

.hero-copy {
  max-width: 47rem;
}

.hero-kicker {
  margin-bottom: var(--space-md);
  color: var(--color-accent);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.hero h1 {
  max-width: 13ch;
  color: var(--color-night-ink);
}

.hero-lede {
  max-width: 58ch;
  margin-top: var(--space-lg);
  color: var(--color-night-muted);
  font-size: clamp(1.05rem, 1.8vw, 1.3rem);
  line-height: 1.55;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  margin-top: var(--space-lg);
}

.hero-audience {
  margin-top: var(--space-lg);
  color: color-mix(in oklch, var(--color-night-ink) 72%, var(--color-transparent));
  font-size: var(--text-sm);
}

.knowledge-index {
  position: relative;
  z-index: 2;
  padding-bottom: var(--space-2xl);
  background: var(--color-paper);
}

.task-index {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin-top: calc(var(--space-xl) * -1);
  background: var(--color-paper);
  border-top: 0.25rem solid var(--color-accent);
  box-shadow: var(--shadow-float);
}

.task-link {
  display: grid;
  grid-template-rows: auto 1fr auto;
  gap: var(--space-sm);
  min-width: 0;
  min-height: 12.5rem;
  padding: var(--space-lg);
  border-right: var(--rule-hair) solid var(--color-rule);
  transition: background-color var(--dur-short) var(--ease-out);
}

.task-link:last-child {
  border-right: 0;
}

.task-link:hover,
.task-link:focus-visible {
  background: var(--color-paper-2);
}

.task-no {
  color: var(--color-accent-strong);
  font-size: var(--text-xs);
  font-weight: 800;
  letter-spacing: 0.12em;
}

.task-link strong {
  align-self: end;
  color: var(--color-ink);
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 400;
  line-height: 1.2;
}

.task-link span:last-child {
  color: var(--color-muted);
  font-size: var(--text-sm);
  white-space: nowrap;
}

.section {
  position: relative;
}

.section-shell {
  padding-block: var(--space-4xl);
}

.section-intro {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(18rem, 0.55fr);
  gap: var(--space-2xl);
  align-items: end;
  margin-bottom: var(--space-2xl);
}

.section-intro p {
  max-width: 52ch;
  color: var(--color-muted);
  font-size: var(--text-md);
}

.section-dark {
  color: var(--color-night-muted);
  background: var(--color-night);
}

.section-dark h2,
.section-dark h3,
.section-dark .section-intro p {
  color: var(--color-night-ink);
}

.systems-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(20rem, 0.65fr);
  gap: var(--space-2xl);
  align-items: stretch;
}

.systems-visual {
  position: relative;
  min-height: 34rem;
  overflow: clip;
  background: var(--color-night-2);
  border-radius: var(--radius-card);
}

.systems-visual picture,
.systems-visual img {
  width: 100%;
  height: 100%;
}

.systems-visual img {
  object-fit: cover;
}

.systems-visual figcaption {
  position: absolute;
  right: var(--space-md);
  bottom: var(--space-md);
  max-width: 26ch;
  padding: var(--space-xs) var(--space-sm);
  color: var(--color-night-ink);
  background: color-mix(in oklch, var(--color-night) 88%, var(--color-transparent));
  font-size: var(--text-xs);
}

.knowledge-list {
  display: flex;
  flex-direction: column;
  border-top: var(--rule-hair) solid color-mix(in oklch, var(--color-night-ink) 20%, var(--color-transparent));
}

.knowledge-row {
  display: grid;
  grid-template-columns: 2.2rem minmax(0, 1fr) auto;
  gap: var(--space-sm);
  align-items: center;
  min-height: 7.5rem;
  padding-block: var(--space-md);
  border-bottom: var(--rule-hair) solid color-mix(in oklch, var(--color-night-ink) 20%, var(--color-transparent));
  transition: background-color var(--dur-short) var(--ease-out);
}

.knowledge-row:hover,
.knowledge-row:focus-visible {
  background: var(--color-night-2);
}

.knowledge-row .row-no {
  color: var(--color-accent);
  font-size: var(--text-xs);
  font-weight: 800;
  font-variant-numeric: tabular-nums;
}

.knowledge-row strong {
  color: var(--color-night-ink);
  font-size: var(--text-md);
}

.knowledge-row small {
  display: block;
  margin-top: var(--space-3xs);
  color: var(--color-night-muted);
  font-size: var(--text-sm);
}

.knowledge-row .arrow {
  color: var(--color-accent);
  white-space: nowrap;
}

.engineering-section {
  background: var(--color-paper-2);
}

.engineering-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: var(--space-2xl);
  align-items: start;
}

.engineering-media {
  position: sticky;
  top: calc(var(--header-height) + var(--space-lg));
  min-width: 0;
}

.engineering-media picture,
.engineering-media img {
  width: 100%;
}

.engineering-media img {
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: var(--radius-card);
}

.media-caption {
  display: flex;
  justify-content: space-between;
  gap: var(--space-md);
  padding-top: var(--space-sm);
  color: var(--color-muted);
  font-size: var(--text-xs);
  border-top: var(--rule-hair) solid var(--color-rule);
}

.cluster-stack {
  display: flex;
  flex-direction: column;
  border-top: var(--rule-hair) solid var(--color-rule);
}

.cluster {
  padding-block: var(--space-xl);
  border-bottom: var(--rule-hair) solid var(--color-rule);
}

.cluster h3 {
  margin-bottom: var(--space-sm);
}

.cluster > p {
  max-width: 56ch;
  color: var(--color-muted);
}

.link-rail {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs) var(--space-md);
  margin-top: var(--space-md);
}

.text-link {
  display: inline-flex;
  align-items: center;
  min-height: 2.75rem;
  color: var(--color-ink);
  font-weight: 700;
  white-space: nowrap;
  border-bottom: 0.125rem solid var(--color-accent-strong);
  transition: color var(--dur-fast) var(--ease-out), border-color var(--dur-fast) var(--ease-out);
}

.text-link:hover,
.text-link:focus-visible {
  color: var(--color-accent-strong);
  border-bottom-color: var(--color-ink);
}

.delivery-section {
  color: var(--color-night-ink);
  background: var(--color-night-2);
}

.delivery-section .section-intro p,
.delivery-section h2,
.delivery-section h3 {
  color: var(--color-night-ink);
}

.stage-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.9fr 0.95fr;
  border-top: var(--rule-hair) solid color-mix(in oklch, var(--color-night-ink) 28%, var(--color-transparent));
}

.stage {
  display: flex;
  min-width: 0;
  min-height: 25rem;
  flex-direction: column;
  padding: var(--space-xl);
  border-right: var(--rule-hair) solid color-mix(in oklch, var(--color-night-ink) 28%, var(--color-transparent));
}

.stage:last-child {
  border-right: 0;
}

.stage:nth-child(2) {
  background: color-mix(in oklch, var(--color-night-2) 82%, var(--color-accent));
}

.stage-no {
  color: var(--color-accent);
  font-size: var(--text-xs);
  font-weight: 800;
  letter-spacing: 0.14em;
}

.stage h3 {
  margin-top: auto;
}

.stage p {
  margin-top: var(--space-sm);
  color: var(--color-night-muted);
}

.stage .text-link {
  align-self: flex-start;
  margin-top: var(--space-lg);
  color: var(--color-night-ink);
}

.resources-section {
  background: var(--color-paper);
}

.resources-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(19rem, 0.8fr);
  gap: var(--space-lg);
}

.resource-feature,
.resource-aside {
  min-width: 0;
  overflow: clip;
  border: var(--rule-hair) solid var(--color-rule);
}

.resource-feature {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(18rem, 0.82fr);
  min-height: 34rem;
  background: var(--color-paper-2);
}

.resource-copy {
  display: flex;
  flex-direction: column;
  padding: var(--space-xl);
}

.resource-copy h3 {
  margin-top: auto;
}

.resource-copy p {
  margin-top: var(--space-sm);
  color: var(--color-muted);
}

.resource-copy .text-link {
  align-self: flex-start;
  margin-top: var(--space-lg);
}

.resource-feature picture,
.resource-feature img {
  width: 100%;
  height: 100%;
}

.resource-feature img {
  object-fit: cover;
}

.resource-aside {
  display: flex;
  flex-direction: column;
  padding: var(--space-xl);
  color: var(--color-night-ink);
  background: var(--color-night);
}

.resource-aside h3 {
  margin-top: auto;
  color: var(--color-night-ink);
}

.resource-aside p {
  margin-top: var(--space-sm);
  color: var(--color-night-muted);
}

.resource-aside .link-rail {
  align-items: flex-start;
  flex-direction: column;
}

.resource-aside .text-link {
  color: var(--color-night-ink);
}

.closing-section {
  color: var(--color-ink);
  background: var(--color-paper-3);
  border-top: 0.25rem solid var(--color-accent);
}

.closing-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(18rem, 0.55fr);
  gap: var(--space-2xl);
  align-items: end;
  padding-block: var(--space-3xl);
}

.closing-grid h2 {
  max-width: 15ch;
}

.closing-copy p {
  color: var(--color-ink-2);
  font-size: var(--text-md);
}

.closing-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  margin-top: var(--space-lg);
}

.closing-actions .btn-primary {
  color: var(--color-night-ink);
  background: var(--color-night);
  border-color: var(--color-night);
}

.closing-actions .btn-primary:hover {
  background: var(--color-night-2);
  border-color: var(--color-night-2);
}

.closing-actions .btn-secondary {
  color: var(--color-ink);
  background: var(--color-transparent);
  border-color: var(--color-ink);
}

.site-footer {
  color: var(--color-night-muted);
  background: var(--color-night);
}

.footer-callout {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(18rem, 0.75fr) auto;
  gap: var(--space-xl);
  align-items: center;
  padding-block: var(--space-2xl);
  border-bottom: var(--rule-hair) solid color-mix(in oklch, var(--color-night-ink) 20%, var(--color-transparent));
}

.footer-callout h2 {
  max-width: 18ch;
  color: var(--color-night-ink);
  font-size: clamp(2rem, 3.4vw, 3.6rem);
}

.footer-callout p {
  max-width: 48ch;
}

.footer-callout .btn {
  white-space: nowrap;
}

.footer-index {
  display: grid;
  grid-template-columns: minmax(16rem, 1.55fr) repeat(4, minmax(8rem, 0.72fr));
  gap: var(--space-xl);
  align-items: start;
  padding-block: var(--space-2xl);
}

.footer-brand img {
  width: 11rem;
  height: auto;
  filter: brightness(0) invert(1);
}

.footer-brand p {
  max-width: 36ch;
  margin-top: var(--space-md);
}

.footer-contact {
  display: flex;
  flex-direction: column;
  gap: var(--space-2xs);
  margin-top: var(--space-lg);
  font-size: var(--text-sm);
  font-style: normal;
}

.footer-nav-group h3 {
  margin-bottom: var(--space-md);
  color: var(--color-night-ink);
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.1em;
  line-height: 1.3;
  text-transform: uppercase;
}

.footer-nav-group ul {
  display: grid;
  gap: var(--space-xs);
}

.footer-nav-group a,
.footer-contact a,
.footer-meta a {
  color: var(--color-night-ink);
  white-space: nowrap;
}

.footer-nav-group a:hover,
.footer-contact a:hover,
.footer-meta a:hover {
  color: var(--color-accent);
}

.footer-meta {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: var(--space-lg);
  padding-block: var(--space-md);
  font-size: var(--text-xs);
  border-top: var(--rule-hair) solid color-mix(in oklch, var(--color-night-ink) 20%, var(--color-transparent));
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs) var(--space-lg);
  align-items: center;
}

.ssl-credit {
  color: var(--color-night-muted);
  text-align: right;
}

@media (max-width: 70rem) {
  .header-inner {
    grid-template-columns: 1fr auto;
  }

  .nav-wrap,
  .header-contact {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }

  .nav-mobile {
    position: fixed;
    inset: var(--header-height) 0 0;
    z-index: var(--z-sticky);
    display: none;
    padding: var(--space-md) var(--page-gutter) var(--space-xl);
    overflow-y: auto;
    color: var(--color-ink);
    background: var(--color-paper);
  }

  .nav-mobile.open {
    display: block;
  }

  .mobile-nav-group {
    border-bottom: var(--rule-hair) solid var(--color-rule);
  }

  .mobile-nav-group summary {
    display: flex;
    align-items: center;
    min-height: 3.5rem;
    color: var(--color-ink);
    font-family: var(--font-display);
    font-size: var(--text-lg);
    cursor: pointer;
  }

  .mobile-nav-links {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-2xs) var(--space-md);
    padding-bottom: var(--space-md);
  }

  .mobile-nav-links a {
    display: flex;
    align-items: center;
    min-height: 2.75rem;
    color: var(--color-ink-2);
    font-size: var(--text-sm);
    font-weight: 600;
    white-space: nowrap;
  }

  .mobile-contact {
    margin-top: var(--space-lg);
    width: 100%;
  }

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

  .task-link:nth-child(2) {
    border-right: 0;
  }

  .task-link:nth-child(-n + 2) {
    border-bottom: var(--rule-hair) solid var(--color-rule);
  }

  .systems-layout,
  .engineering-grid,
  .resources-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .engineering-media {
    position: static;
  }

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

  .stage {
    min-height: 18rem;
    border-right: 0;
    border-bottom: var(--rule-hair) solid color-mix(in oklch, var(--color-night-ink) 28%, var(--color-transparent));
  }

  .stage:last-child {
    border-bottom: 0;
  }
}

@media (max-width: 48rem) {
  .hero {
    min-height: auto;
  }

  .hero-media img {
    object-position: center center;
  }

  .hero-media::after {
    background: linear-gradient(0deg, color-mix(in oklch, var(--color-night) 97%, var(--color-transparent)) 0%, color-mix(in oklch, var(--color-night) 84%, var(--color-transparent)) 64%, color-mix(in oklch, var(--color-night) 58%, var(--color-transparent)) 100%);
  }

  .hero-content {
    padding-block: calc(var(--header-height) + var(--space-xl)) var(--space-xl);
  }

  .hero h1 {
    max-width: 12ch;
    font-size: clamp(2.65rem, 13vw, 4.25rem);
    line-height: 1.04;
  }

  .hero-lede {
    max-width: 37ch;
    font-size: var(--text-base);
  }

  .task-index {
    margin-top: calc(var(--space-md) * -1);
  }

  .section-shell {
    padding-block: var(--space-3xl);
  }

  .section-intro,
  .closing-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: var(--space-lg);
  }

  .systems-visual {
    min-height: 24rem;
  }

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

  .resource-feature picture,
  .resource-feature img {
    min-height: 18rem;
  }

  .footer-callout,
  .footer-index,
  .footer-meta {
    grid-template-columns: minmax(0, 1fr);
    align-items: flex-start;
  }

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

  .footer-brand {
    grid-column: 1 / -1;
  }

  .ssl-credit {
    text-align: left;
  }
}

@media (max-width: 40rem) {
  .footer-callout,
  .footer-index {
    grid-template-columns: minmax(0, 1fr);
  }

  .footer-brand {
    grid-column: auto;
  }

  .mobile-nav-links {
    grid-template-columns: minmax(0, 1fr);
  }

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

  .task-link {
    min-height: 9rem;
    border-right: 0;
    border-bottom: var(--rule-hair) solid var(--color-rule);
  }

  .task-link:last-child {
    border-bottom: 0;
  }

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

  .hero-actions .btn,
  .closing-actions .btn {
    width: 100%;
  }

  .knowledge-row {
    grid-template-columns: 1.7rem minmax(0, 1fr) auto;
  }

  .knowledge-row small {
    display: none;
  }

  .stage,
  .resource-copy,
  .resource-aside {
    padding: var(--space-lg);
  }
}

@media (max-width: 23.5rem) {
  .hero h1 {
    font-size: 2.5rem;
  }

  .hero-audience {
    font-size: var(--text-xs);
  }
}

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

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