:root {
  --bg: #c7cccf;
  --surface: #e3e6e7;
  --surface-raised: #aeb5b8;
  --text: #171a1b;
  --text-soft: #353c3f;
  --muted: #4c565a;
  --faint: #626c71;
  --line: #687277;
  --line-strong: #4f595e;
  --accent: #30363a;
  --accent-hover: #171a1c;
  --accent-ink: #f2f4f4;
  --signal: #84271f;
  --panel: #24292b;
  --panel-text: #edf0f1;
  --panel-soft: #c1c7ca;
  --panel-line: #707a7e;
  --font-sans: Arial, "Helvetica Neue", Helvetica, sans-serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  --container: 74rem;
  color-scheme: light;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 5rem;
}

body {
  margin: 0;
  overflow-x: hidden;
  color: var(--text);
  background: var(--bg);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.58;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

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

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

h1,
h2,
h3 {
  color: var(--text);
  line-height: 1.12;
  letter-spacing: -0.025em;
}

h1 {
  max-width: 38rem;
  margin-bottom: 0;
  font-size: clamp(2.35rem, 4.2vw, 3.4rem);
  font-weight: 500;
}

h2 {
  margin-bottom: 1rem;
  font-size: clamp(1.75rem, 3vw, 2.2rem);
  font-weight: 500;
}

h3 {
  margin-bottom: 0.55rem;
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

p {
  color: var(--muted);
}

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

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

.container {
  width: min(100% - 3rem, var(--container));
  margin-inline: auto;
}

.skip-link {
  position: fixed;
  top: 0.75rem;
  left: 0.75rem;
  z-index: 100;
  padding: 0.55rem 0.8rem;
  color: var(--accent-ink);
  background: var(--accent);
  transform: translateY(-180%);
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid var(--line-strong);
  background: rgba(199, 204, 207, 0.97);
}

.header-inner {
  display: flex;
  min-height: 4rem;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
}

.wordmark {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  color: var(--text);
  font-size: 0.96rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.wordmark img {
  width: auto;
  height: 26px;
  flex: none;
}

.site-nav,
.footer-compact nav {
  display: flex;
  align-items: center;
  gap: 1.7rem;
}

.site-nav a,
.footer-compact a {
  color: var(--text-soft);
  font-size: 0.76rem;
  font-weight: 600;
  letter-spacing: 0.055em;
  text-transform: uppercase;
}

.site-nav a:hover,
.footer-compact a:hover,
.text-link:hover {
  color: var(--accent-hover);
}

.button {
  display: inline-flex;
  min-height: 2.65rem;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  padding: 0.65rem 1rem;
  border: 1px solid var(--line-strong);
  background: transparent;
  color: var(--text);
  font-size: 0.84rem;
  font-weight: 600;
  line-height: 1;
}

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

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

.button--quiet:hover {
  border-color: var(--muted);
  background: var(--surface-raised);
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
}

.section-label,
.platform-label {
  margin-bottom: 1.1rem;
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.text-link {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  color: var(--accent);
  font-size: 0.84rem;
  font-weight: 600;
}

.home-hero {
  display: grid;
  min-height: 29rem;
  padding-block: clamp(4.5rem, 8vw, 7rem);
  align-items: start;
  grid-template-columns: minmax(0, 0.95fr) minmax(20rem, 0.75fr);
  gap: clamp(4rem, 9vw, 9rem);
}

.home-hero > *,
.information-row > * {
  min-width: 0;
}

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

.hero-summary > p:first-child {
  max-width: 35rem;
  margin-bottom: 1.8rem;
  color: var(--text-soft);
  font-size: 1.15rem;
  line-height: 1.55;
}

.build-status {
  display: flex;
  margin: 1.5rem 0 0;
  align-items: center;
  gap: 0.55rem;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.025em;
}

.build-status span {
  display: inline-block;
  width: 0.5rem;
  height: 0.5rem;
  background: var(--signal);
}

.system-strip {
  color: var(--panel-text);
  border-block: 1px solid var(--line-strong);
  background: var(--panel);
}

.system-flow {
  display: grid;
  min-height: 8.5rem;
  align-items: stretch;
  grid-template-columns: 1fr auto 1fr auto 1fr;
}

.system-flow > div {
  display: grid;
  padding: 1.55rem 1.5rem;
  align-content: center;
  gap: 0.4rem;
}

.system-flow > div:first-child {
  padding-left: 0;
}

.system-flow > div:last-child {
  padding-right: 0;
}

.flow-label {
  color: var(--panel-soft);
  font-family: var(--font-mono);
  font-size: 0.63rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.system-flow strong {
  color: var(--panel-text);
  font-size: 0.9rem;
  font-weight: 500;
}

.flow-arrow {
  display: grid;
  width: 4rem;
  place-items: center;
  color: var(--panel-soft);
  border-inline: 1px solid var(--panel-line);
  font-family: var(--font-mono);
}

.system-flow > div:last-child .flow-label {
  color: var(--panel-text);
}

.home-section,
.documentation-row {
  padding-block: clamp(4.5rem, 8vw, 6.5rem);
}

.section-rule {
  border-top: 1px solid var(--line-strong);
}

.section-intro {
  max-width: 46rem;
}

.section-intro > p:last-child {
  max-width: 42rem;
  margin-bottom: 0;
}

.capability-list {
  margin-top: 3.5rem;
  border-top: 1px solid var(--line-strong);
}

.capability-list article {
  display: grid;
  padding-block: 1.6rem;
  border-bottom: 1px solid var(--line);
  grid-template-columns: minmax(11rem, 0.45fr) minmax(0, 1fr);
  gap: 2rem;
}

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

.capability-list p {
  max-width: 46rem;
}

.backend-status {
  display: grid;
  margin-top: 4rem;
  border: 1px solid var(--line-strong);
  grid-template-columns: minmax(12rem, 0.46fr) minmax(0, 1fr);
}

.backend-status > h3 {
  margin: 0;
  padding: 1.4rem;
  color: var(--accent-ink);
  background: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  grid-row: 1 / 4;
}

.backend-row {
  display: grid;
  min-height: 4.4rem;
  padding: 1rem 1.25rem;
  align-items: center;
  border-bottom: 1px solid var(--line);
  grid-column: 2;
  grid-template-columns: 8rem 1fr;
  gap: 1rem;
}

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

.backend-row strong {
  color: var(--text);
  font-size: 0.85rem;
}

.backend-row span {
  color: var(--muted);
  font-size: 0.86rem;
  overflow-wrap: anywhere;
}

.information-row {
  display: grid;
  grid-template-columns: minmax(14rem, 0.72fr) minmax(0, 1fr);
  gap: clamp(3rem, 10vw, 10rem);
}

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

.information-copy p {
  margin-bottom: 1rem;
}

.information-copy .text-link {
  margin-top: 0.5rem;
}

.mechanism {
  margin-top: clamp(3rem, 6vw, 5rem);
  margin-bottom: 0;
  padding: clamp(1rem, 2vw, 1.5rem);
  border: 1px solid var(--line-strong);
  background: var(--surface);
}

.mechanism img {
  width: 100%;
}

figcaption {
  margin-top: 0.85rem;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  line-height: 1.5;
}

.platform-grid {
  margin-top: 3.5rem;
  border-top: 1px solid var(--line-strong);
}

.platform-grid > article {
  display: grid;
  min-width: 0;
  padding-block: 2.5rem;
  border-bottom: 1px solid var(--line-strong);
  grid-template-columns: minmax(14rem, 0.42fr) minmax(0, 1fr);
  grid-template-rows: auto auto 1fr;
  column-gap: clamp(3rem, 8vw, 8rem);
}

.platform-grid > article + article {
  border-left: 0;
}

.platform-label {
  grid-column: 1;
  grid-row: 1;
  margin-bottom: 0.7rem;
  color: var(--accent);
}

.platform-grid h3 {
  grid-column: 1;
  grid-row: 2;
  margin-bottom: 1.5rem;
  font-size: 1.35rem;
  font-weight: 500;
}

.platform-grid figure {
  min-width: 0;
  margin: 0;
  grid-column: 2;
  grid-row: 1 / 4;
}

.platform-grid figure img {
  width: 100%;
  border: 1px solid var(--line);
  background: var(--surface);
}

.platform-grid > article > p:last-child {
  grid-column: 1;
  grid-row: 3;
  align-self: start;
  max-width: 38rem;
  margin-bottom: 0;
  font-size: 0.9rem;
}

.reference-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
}

.site-footer {
  border-top: 1px solid var(--line-strong);
  background: var(--panel);
}

.footer-compact {
  display: flex;
  min-height: 6rem;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
}

.footer-compact > span {
  color: var(--panel-soft);
  font-family: var(--font-mono);
  font-size: 0.68rem;
}

.footer-compact a {
  color: var(--panel-text);
}

.footer-compact a:hover {
  color: var(--panel-soft);
}

@media (max-width: 850px) {
  .home-hero {
    min-height: 0;
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }

  .hero-summary {
    padding-top: 0;
  }

  .information-row {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .platform-grid {
    border-bottom: 0;
  }

  .platform-grid > article {
    display: block;
  }

  .platform-grid > article + article {
    border-left: 0;
  }

  .platform-grid figure {
    margin-bottom: 1.5rem;
  }
}

@media (max-width: 680px) {
  .container {
    width: min(100% - 2rem, var(--container));
  }

  .site-header {
    position: static;
  }

  .header-inner {
    flex-wrap: wrap;
    min-height: 3.7rem;
    padding-block: 0.65rem;
    gap: 0.55rem 1rem;
  }

  .wordmark img {
    width: auto;
    height: 23px;
  }

  .site-nav {
    width: 100%;
    min-width: 0;
    padding-top: 0.55rem;
    justify-content: space-between;
    border-top: 1px solid var(--line);
    gap: 0.8rem;
  }

  .site-nav a {
    font-size: 0.64rem;
  }

  .home-hero {
    padding-block: 4rem;
  }

  h1 {
    font-size: clamp(2.05rem, 10vw, 2.45rem);
  }

  .hero-summary > p:first-child {
    font-size: 1.04rem;
  }

  .system-flow {
    grid-template-columns: 1fr;
  }

  .system-flow > div,
  .system-flow > div:first-child,
  .system-flow > div:last-child {
    min-height: 5.8rem;
    padding: 1.25rem 0;
  }

  .flow-arrow {
    width: 100%;
    height: 2rem;
    border-block: 1px solid var(--panel-line);
    border-inline: 0;
    font-size: 0;
  }

  .flow-arrow::after {
    content: "↓";
    font-size: 0.75rem;
  }

  .capability-list article {
    grid-template-columns: 1fr;
    gap: 0.5rem;
  }

  .backend-status {
    grid-template-columns: 1fr;
  }

  .backend-status > h3 {
    grid-row: auto;
  }

  .backend-row {
    min-height: 0;
    grid-column: 1;
    grid-template-columns: 1fr;
    gap: 0.3rem;
  }

  .platform-grid > article {
    padding-block: 1.7rem;
  }

  .mechanism,
  .platform-grid figure {
    overflow-x: auto;
    overscroll-behavior-inline: contain;
  }

  .mechanism::before,
  .platform-grid figure::before {
    content: "Scroll diagram horizontally →";
    display: block;
    margin-bottom: 0.75rem;
    color: var(--muted);
    font-family: var(--font-mono);
    font-size: 0.62rem;
    letter-spacing: 0.04em;
    text-transform: uppercase;
  }

  .mechanism img {
    width: 960px;
    max-width: none;
  }

  .platform-grid figure img {
    width: 760px;
    max-width: none;
  }

  .mechanism figcaption,
  .platform-grid figure figcaption {
    width: min(100%, 34rem);
  }

  .footer-compact {
    padding-block: 1.5rem;
    align-items: flex-start;
    flex-direction: column;
  }

  .footer-compact nav {
    flex-wrap: wrap;
    gap: 0.8rem 1.2rem;
  }
}

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