:root {
  color-scheme: dark;

  --color-bg: #0b0f14;
  --color-surface: #111821;
  --color-surface-raised: #161f2b;
  --color-border: #283342;
  --color-border-strong: #3b495b;

  --color-text: #edf2f7;
  --color-text-muted: #9ba9ba;
  --color-text-subtle: #728094;

  --color-accent: #6aa9ff;
  --color-accent-strong: #8bbcff;
  --color-accent-contrast: #07111f;

  --color-success: #4fc38d;
  --color-warning: #e8b15c;
  --color-critical: #ef7373;

  --font-sans:
    Inter,
    ui-sans-serif,
    system-ui,
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    sans-serif;

  --font-mono:
    "JetBrains Mono",
    "Cascadia Code",
    "SFMono-Regular",
    Consolas,
    monospace;

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 3rem;
  --space-8: 4rem;
  --space-9: 6rem;

  --radius-small: 0.5rem;
  --radius-medium: 1rem;
  --radius-large: 1.5rem;
  --radius-pill: 999px;

  --content-width: 76rem;
  --reading-width: 48rem;

  --transition-fast: 160ms ease;
}

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

html {
  min-width: 20rem;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  overflow-wrap: break-word;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.65;
  text-rendering: optimizeLegibility;
}

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

a {
  color: var(--color-accent);
  text-underline-offset: 0.2em;
}

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

a:focus-visible,
button:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 4px;
}

h1,
h2,
h3 {
  margin-top: 0;
  color: var(--color-text);
  font-weight: 750;
  letter-spacing: -0.035em;
  line-height: 1.08;
}

h1 {
  max-width: 15ch;
  margin-bottom: var(--space-5);
  font-size: clamp(2.7rem, 8vw, 5.8rem);
}

h2 {
  max-width: 18ch;
  margin-bottom: var(--space-4);
  font-size: clamp(2rem, 5vw, 3.5rem);
}

p {
  margin-top: 0;
}

.content-shell {
  width: min(
    calc(100% - (var(--space-5) * 2)),
    var(--content-width)
  );
  margin-inline: auto;
}

.skip-link {
  position: absolute;
  top: var(--space-3);
  left: var(--space-3);
  z-index: 10;
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-small);
  background: var(--color-text);
  color: var(--color-bg);
  font-weight: 700;
  text-decoration: none;
  transform: translateY(-200%);
}

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

.site-header {
  border-bottom: 1px solid var(--color-border);
  background: var(--color-bg);
}

.site-header__inner {
  display: flex;
  width: min(
    calc(100% - (var(--space-5) * 2)),
    var(--content-width)
  );
  min-height: 5rem;
  margin-inline: auto;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-5);
}

.site-brand {
  flex: 0 0 auto;
  color: var(--color-text);
  font-size: 1rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  text-decoration: none;
}

.site-brand:hover {
  color: var(--color-accent-strong);
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: var(--space-2) var(--space-5);
}

.site-nav a {
  color: var(--color-text-muted);
  font-size: 0.925rem;
  font-weight: 650;
  text-decoration: none;
}

.site-nav a:hover {
  color: var(--color-text);
}

.hero {
  display: grid;
  min-height: clamp(30rem, 62vh, 42rem);
  align-items: center;
  padding-block: var(--space-9);
  border-bottom: 1px solid var(--color-border);
}

.eyebrow {
  margin-bottom: var(--space-4);
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.hero__summary {
  max-width: 42rem;
  margin-bottom: var(--space-6);
  color: var(--color-text-muted);
  font-size: clamp(1.05rem, 2vw, 1.3rem);
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.button {
  display: inline-flex;
  min-height: 3rem;
  padding: 0.75rem 1.1rem;
  align-items: center;
  justify-content: center;
  border: 1px solid transparent;
  border-radius: var(--radius-small);
  font-weight: 750;
  line-height: 1;
  text-decoration: none;
  transition:
    background-color var(--transition-fast),
    border-color var(--transition-fast),
    color var(--transition-fast),
    transform var(--transition-fast);
}

.button:hover {
  transform: translateY(-1px);
}

.button--primary {
  background: var(--color-accent);
  color: var(--color-accent-contrast);
}

.button--primary:hover {
  background: var(--color-accent-strong);
  color: var(--color-accent-contrast);
}

.button--secondary {
  border-color: var(--color-border-strong);
  background: transparent;
  color: var(--color-text);
}

.button--secondary:hover {
  border-color: var(--color-accent);
  color: var(--color-accent-strong);
}

.page-section {
  padding-block: var(--space-9);
  border-bottom: 1px solid var(--color-border);
}

.page-section p:not(.eyebrow) {
  max-width: var(--reading-width);
  color: var(--color-text-muted);
  font-size: 1.08rem;
}

.site-footer {
  padding-block: var(--space-7);
  color: var(--color-text-subtle);
}

.site-footer .content-shell {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--space-3) var(--space-6);
}

.site-footer p {
  margin: 0;
  font-size: 0.9rem;
}

@media (max-width: 48rem) {
  .site-header__inner {
    min-height: auto;
    padding-block: var(--space-4);
    align-items: flex-start;
    flex-direction: column;
  }

  .site-nav {
    width: 100%;
    justify-content: flex-start;
    gap: var(--space-2) var(--space-4);
  }

  .hero {
    min-height: auto;
    padding-block: var(--space-8);
  }

  .page-section {
    padding-block: var(--space-8);
  }
}

@media (max-width: 30rem) {
  .content-shell,
  .site-header__inner {
    width: min(
      calc(100% - (var(--space-4) * 2)),
      var(--content-width)
    );
  }

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

  .button {
    width: 100%;
  }
}

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

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}

.section-heading {
  margin-bottom: var(--space-7);
}

.section-heading > p:not(.eyebrow) {
  max-width: var(--reading-width);
}

.product-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-4);
}

.product-card {
  min-width: 0;
  padding: var(--space-5);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-medium);
  background: var(--color-surface);
}

.product-card h3 {
  margin-bottom: var(--space-2);
  font-size: 1.55rem;
}

.product-card p {
  color: var(--color-text-muted);
}

.product-card p:last-child {
  margin-bottom: 0;
}

.product-card__status {
  display: inline-flex;
  margin-bottom: var(--space-5);
  padding: var(--space-1) var(--space-3);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-pill);
  color: var(--color-text-subtle);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  line-height: 1.5;
  text-transform: uppercase;
}

.product-card__descriptor {
  margin-bottom: var(--space-4);
  color: var(--color-accent) !important;
  font-weight: 700;
}

@media (max-width: 56rem) {
  .product-grid {
    grid-template-columns: 1fr;
  }
}

.principle-grid {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  border-top: 1px solid var(--color-border);
  border-left: 1px solid var(--color-border);
}

.principle {
  min-width: 0;
  padding: var(--space-5);
  border-right: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.principle:nth-child(1),
.principle:nth-child(2),
.principle:nth-child(3) {
  grid-column: span 2;
}

.principle:nth-child(4),
.principle:nth-child(5) {
  grid-column: span 3;
}

.principle h3 {
  margin-bottom: var(--space-3);
  font-size: 1.2rem;
}

.principle p:last-child {
  margin-bottom: 0;
  color: var(--color-text-muted);
  font-size: 0.96rem;
}

.principle__number {
  margin-bottom: var(--space-5);
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
}

@media (max-width: 48rem) {
  .principle-grid {
    grid-template-columns: 1fr;
  }

  .principle:nth-child(1),
  .principle:nth-child(2),
  .principle:nth-child(3),
  .principle:nth-child(4),
  .principle:nth-child(5) {
    grid-column: auto;
  }
}

.evidence-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border-top: 1px solid var(--color-border);
  border-left: 1px solid var(--color-border);
}

.evidence-item {
  display: flex;
  min-width: 0;
  min-height: 16rem;
  padding: var(--space-5);
  border-right: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  flex-direction: column;
  align-items: flex-start;
}

.evidence-item h3 {
  margin-bottom: var(--space-3);
  font-size: 1.35rem;
}

.evidence-item p:not(.evidence-item__label) {
  margin-bottom: var(--space-4);
  color: var(--color-text-muted);
  font-size: 0.96rem;
}

.evidence-item a {
  margin-top: auto;
  font-weight: 700;
  text-decoration-thickness: 1px;
}

.evidence-item__label {
  margin-bottom: var(--space-5);
  color: var(--color-accent) !important;
  font-family: var(--font-mono);
  font-size: 0.72rem !important;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

@media (max-width: 48rem) {
  .evidence-grid {
    grid-template-columns: 1fr;
  }

  .evidence-item {
    min-height: auto;
  }
}

.build-section__layout {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(18rem, 0.9fr);
  gap: var(--space-8);
  align-items: start;
}

.build-section .section-heading {
  margin-bottom: 0;
}

.build-panel {
  padding: var(--space-6);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-medium);
  background: var(--color-surface);
}

.build-panel h3 {
  margin-bottom: var(--space-3);
  font-size: 1.65rem;
}

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

.build-panel .button {
  margin-top: var(--space-3);
}

.build-panel__label {
  margin-bottom: var(--space-5);
  color: var(--color-accent) !important;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

@media (max-width: 48rem) {
  .build-section__layout {
    grid-template-columns: 1fr;
    gap: var(--space-6);
  }
}

.platform-layout {
  display: grid;
  grid-template-columns: minmax(17rem, 0.85fr) minmax(0, 1.35fr);
  gap: var(--space-8);
  align-items: start;
}

.platform-layout .section-heading {
  margin-bottom: 0;
}

.capability-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid var(--color-border);
  border-left: 1px solid var(--color-border);
}

.capability {
  min-width: 0;
  padding: var(--space-5);
  border-right: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.capability h3 {
  margin-bottom: var(--space-3);
  font-size: 1.15rem;
}

.capability p {
  margin-bottom: 0;
  color: var(--color-text-muted);
  font-size: 0.95rem;
}

@media (max-width: 56rem) {
  .platform-layout {
    grid-template-columns: 1fr;
    gap: var(--space-6);
  }
}

@media (max-width: 36rem) {
  .capability-grid {
    grid-template-columns: 1fr;
  }
}

.closing-section {
  padding-block: var(--space-9);
  border-bottom: 1px solid var(--color-border);
  background: var(--color-surface);
}

.closing-section__layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: var(--space-8);
  align-items: end;
}

.closing-section h2 {
  margin-bottom: var(--space-4);
}

.closing-section p:not(.eyebrow) {
  max-width: var(--reading-width);
  margin-bottom: 0;
  color: var(--color-text-muted);
  font-size: 1.08rem;
}

.closing-section__actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: var(--space-3);
}

.site-footer {
  padding-block: var(--space-8) var(--space-5);
  color: var(--color-text-subtle);
}

.site-footer__layout {
  display: grid;
  grid-template-columns: minmax(16rem, 1fr) minmax(0, 1.5fr);
  gap: var(--space-8);
}

.site-footer__identity {
  max-width: 28rem;
}

.site-footer__identity p {
  color: var(--color-text-muted);
}

.site-footer__brand {
  display: inline-block;
  margin-bottom: var(--space-4);
  color: var(--color-text);
  font-size: 1.1rem;
  font-weight: 800;
  text-decoration: none;
}

.site-footer__brand:hover {
  color: var(--color-accent-strong);
}

.site-footer__nav {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-5);
}

.site-footer__nav div {
  display: flex;
  min-width: 0;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--space-2);
}

.site-footer__nav a {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  text-decoration: none;
}

.site-footer__nav a:hover {
  color: var(--color-text);
}

.site-footer__heading {
  margin-bottom: var(--space-2);
  color: var(--color-text);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.site-footer__meta {
  display: flex;
  margin-top: var(--space-7);
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-border);
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--space-2) var(--space-5);
}

.site-footer__meta p {
  margin: 0;
  font-size: 0.78rem;
}

@media (max-width: 48rem) {
  .closing-section__layout,
  .site-footer__layout {
    grid-template-columns: 1fr;
    gap: var(--space-6);
  }

  .closing-section__actions {
    justify-content: flex-start;
  }
}

@media (max-width: 36rem) {
  .site-footer__nav {
    grid-template-columns: 1fr;
  }

  .site-footer__meta {
    align-items: flex-start;
    flex-direction: column;
  }
}

/* Mobile browser QA polish */
@media (max-width: 48rem) {
  .site-header__inner {
    gap: var(--space-4);
  }

  .site-brand {
    font-size: 1.05rem;
  }

  .site-nav {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-2);
  }

  .site-nav a {
    display: flex;
    min-height: 2.75rem;
    padding: var(--space-2) var(--space-3);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-small);
    align-items: center;
    justify-content: center;
    background: var(--color-surface);
    font-size: 0.9rem;
    text-align: center;
  }

  .site-nav a:last-child:nth-child(odd) {
    grid-column: 1 / -1;
  }

  .site-footer__nav {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-6) var(--space-5);
  }

  .site-footer__nav > div:last-child {
    grid-column: 1 / -1;
  }

  .site-footer__identity p,
  .site-footer__nav a {
    font-size: 0.95rem;
  }
}


/* Platform route */
.route-hero {
  padding-block: var(--space-9);
  border-bottom: 1px solid var(--color-border);
}

.route-hero__layout {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(18rem, 0.65fr);
  gap: var(--space-8);
  align-items: end;
}

.route-hero h1 {
  max-width: 17ch;
  font-size: clamp(2.7rem, 7vw, 5.2rem);
}

.route-hero__summary {
  max-width: 44rem;
  margin-bottom: var(--space-6);
  color: var(--color-text-muted);
  font-size: clamp(1.05rem, 2vw, 1.3rem);
}

.platform-facts {
  margin: 0;
  border-top: 1px solid var(--color-border);
}

.platform-facts div {
  padding-block: var(--space-4);
  border-bottom: 1px solid var(--color-border);
}

.platform-facts dt {
  margin-bottom: var(--space-2);
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.platform-facts dd {
  margin: 0;
  color: var(--color-text);
  font-weight: 650;
}

.platform-layer-grid,
.platform-boundary-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border-top: 1px solid var(--color-border);
  border-left: 1px solid var(--color-border);
}

.platform-layer,
.platform-boundary {
  min-width: 0;
  padding: var(--space-6);
  border-right: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.platform-layer h3,
.platform-boundary h3 {
  margin-bottom: var(--space-3);
  font-size: 1.4rem;
}

.platform-layer p:last-child,
.platform-boundary p:last-child {
  margin-bottom: 0;
  color: var(--color-text-muted);
}

.platform-layer__number,
.platform-boundary__label {
  margin-bottom: var(--space-5);
  color: var(--color-accent) !important;
  font-family: var(--font-mono);
  font-size: 0.72rem !important;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

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

@media (max-width: 56rem) {
  .route-hero__layout,
  .platform-layer-grid,
  .platform-boundary-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .route-hero__layout {
    align-items: start;
    gap: var(--space-7);
  }
}

@media (max-width: 48rem) {
  .route-hero {
    padding-block: var(--space-8);
  }
}

@media (max-width: 22rem) {
  .route-hero h1 {
    overflow-wrap: normal;
    font-size: 2.5rem;
    word-break: normal;
  }
}

.site-nav a[aria-current="page"] {
  color: var(--color-text);
}

.site-nav a[aria-current="page"]::after {
  display: inline-block;
  width: 0.35rem;
  height: 0.35rem;
  margin-left: var(--space-2);
  border-radius: var(--radius-pill);
  background: var(--color-accent);
  content: "";
}

@media (max-width: 48rem) {
  .site-nav a[aria-current="page"] {
    border-color: var(--color-accent);
    background: var(--color-surface-raised);
  }
}


/* Products route */
.products-facts {
  margin: 0;
  border-top: 1px solid var(--color-border);
}

.products-facts div {
  padding-block: var(--space-4);
  border-bottom: 1px solid var(--color-border);
}

.products-facts dt {
  margin-bottom: var(--space-2);
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.products-facts dd {
  margin: 0;
  color: var(--color-text);
  font-weight: 650;
}

.products-route .product-card {
  display: flex;
  padding: var(--space-6);
  flex-direction: column;
}

.product-card__summary {
  margin-bottom: var(--space-5);
}

.product-card__capabilities {
  margin: 0 0 var(--space-5);
  padding: 0;
  border-bottom: 1px solid var(--color-border);
  list-style: none;
}

.product-card__capabilities li {
  padding-block: var(--space-3);
  border-top: 1px solid var(--color-border);
  color: var(--color-text-muted);
  font-size: 0.94rem;
}

.product-card__availability {
  margin-top: auto;
  color: var(--color-text-subtle) !important;
  font-size: 0.86rem;
}

.product-card__action {
  margin-top: auto;
  align-self: flex-start;
}


/* Shepherd route */
.product-boundary-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid var(--color-border);
  border-left: 1px solid var(--color-border);
}

.product-boundary {
  min-width: 0;
  padding: var(--space-6);
  border-right: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.product-boundary h3 {
  margin-bottom: var(--space-3);
  font-size: 1.4rem;
}

.product-boundary p:last-child {
  margin-bottom: 0;
  color: var(--color-text-muted);
}

.product-boundary__label {
  margin-bottom: var(--space-5);
  color: var(--color-accent) !important;
  font-family: var(--font-mono);
  font-size: 0.72rem !important;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

@media (max-width: 56rem) {
  .product-boundary-grid {
    grid-template-columns: minmax(0, 1fr);
  }
}