:root {
  --bg: #EEF2FF;
  --panel: #ffffff;
  --ink: #0F172A;
  --muted: #475569;
  --soft: #eef1f6;
  --line: #dce2ea;
  --accent: #4f46e5;
  --accent-soft: #eef0ff;
  --green: #03684a;
  --amber: #b7791f;
  --code: #0F172A;
  --fs-xs:12px;--fs-sm:14px;--fs-md:16px;--fs-lg:19px;--fs-xl:22px;--fs-2xl:26px;--h1:clamp(30px,5vw,52px);--h2:clamp(24px,3.6vw,38px);
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --sans: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: var(--fs-md);
  line-height: 1.55;
}

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

.topbar {
  align-items: center;
  background: rgba(255, 255, 255, 0.94);
  border-bottom: 1px solid var(--line);
  display: flex;
  gap: 24px;
  justify-content: space-between;
  padding: 14px 48px;
  position: sticky;
  top: 0;
  z-index: 20;
}

.brand img {
  display: block;
  height: 42px;
  width: auto;
}

nav {
  align-items: center;
  display: flex;
  gap: 18px;
}

nav a {
  color: var(--muted);
  font-size: var(--fs-sm);
  font-weight: 700;
}

nav a:hover,
aside a.active {
  color: var(--accent);
}

.language-switch {
  align-items: center;
  border: 1px solid var(--line);
  border-radius: 999px;
  display: inline-flex;
  gap: 2px;
  padding: 3px;
}

.language-switch a {
  border-radius: 999px;
  color: var(--muted);
  font-size: var(--fs-xs);
  line-height: 1;
  padding: 6px 8px;
}

.language-switch a.active {
  background: var(--ink);
  color: #fff;
}

.language-memory {
  background: var(--accent-soft);
  border: 1px solid #c7d2fe;
  border-radius: 8px;
  color: var(--accent);
  font-size: var(--fs-sm);
  font-weight: 800;
  margin: 0 0 18px;
  padding: 10px 12px;
}

.language-memory[hidden] {
  display: none;
}

main {
  margin: 0 auto;
  max-width: 1180px;
  padding: 48px 48px 76px;
}

h1,
h2,
h3 {
  letter-spacing: 0;
  line-height: 1.08;
  margin: 0;
}

h1 {
  font-size: var(--h1);
  max-width: 12ch;
}

h2 {
  font-size: var(--h2);
  max-width: 14ch;
}

h3 {
  font-size: var(--fs-lg);
}

.hero {
  align-items: center;
  display: grid;
  gap: 36px;
  grid-template-columns: minmax(0, 1fr) minmax(420px, 0.86fr);
  min-height: 520px;
}

.hero-copy,
.section-head {
  min-width: 0;
}

.kicker {
  color: var(--green);
  font-family: var(--mono);
  font-size: var(--fs-sm);
  font-weight: 800;
  margin: 0 0 14px;
}

.lede,
.section-copy {
  color: var(--muted);
  font-size: var(--fs-lg);
  margin: 20px 0 0;
  max-width: 62ch;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.button {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--ink);
  display: inline-flex;
  font-weight: 800;
  padding: 11px 16px;
}

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

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

.button.primary:hover {
  color: #fff;
}

.command-panel,
.doc-body pre,
.terminal {
  background: var(--code);
  border-radius: 8px;
  color: #E0E7FF;
  font-family: var(--mono);
  font-size: var(--fs-sm);
  line-height: 1.72;
  overflow: hidden;
}

.command-panel {
  border: 1px solid rgba(255,255,255,.12);
  box-shadow: 0 22px 60px rgba(17, 24, 39, 0.18);
}

.panel-head {
  align-items: center;
  border-bottom: 1px solid rgba(255,255,255,.12);
  color: #9ca3af;
  display: flex;
  font-family: var(--mono);
  font-size: var(--fs-xs);
  justify-content: space-between;
  padding: 12px 16px;
}

.panel-head strong {
  color: #d1d5db;
  font-weight: 700;
}

pre {
  margin: 0;
}

.command-panel pre,
.doc-body pre,
.terminal {
  overflow-x: auto;
  padding: 20px;
}

code {
  background: var(--accent-soft);
  border-radius: 5px;
  color: #34308d;
  font-family: var(--mono);
  font-size: 0.92em;
  padding: 0.08rem 0.32rem;
}

pre code,
.command-panel code,
.terminal code {
  background: transparent;
  color: inherit;
  padding: 0;
}

.facts {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin: 8px 0 56px;
}

.facts div,
.feature,
.doc-card,
.example,
.transport,
.flow-item {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.facts div {
  padding: 16px;
}

.facts span,
.transport span,
.doc-card small {
  color: var(--muted);
}

.facts span {
  display: block;
  font-size: var(--fs-sm);
  margin-bottom: 5px;
}

.facts strong {
  display: block;
  font-size: var(--fs-md);
}

.section {
  border-top: 1px solid var(--line);
  padding: 64px 0;
}

.split,
.runtime-map {
  align-items: start;
  display: grid;
  gap: 36px;
  grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.18fr);
}

.flow-list,
.example-list {
  display: grid;
  gap: 12px;
}

.flow-item,
.feature,
.example {
  padding: 18px;
}

.flow-item code,
.example code {
  display: inline-block;
  margin-bottom: 12px;
}

.flow-item p,
.feature p,
.example p {
  color: var(--muted);
  margin: 8px 0 0;
}

.feature-grid,
.grid,
.transport-grid {
  display: grid;
  gap: 14px;
  margin-top: 22px;
}

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

.grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.transport-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: 0;
}

.doc-card {
  display: grid;
  gap: 8px;
  min-height: 132px;
  padding: 18px;
}

.doc-card span {
  font-size: var(--fs-md);
  font-weight: 850;
}

.doc-card:hover,
.feature:hover,
.example:hover,
.transport:hover {
  border-color: var(--accent);
}

.example a:hover code {
  border-color: var(--accent);
}

.transport {
  display: grid;
  gap: 7px;
  min-height: 96px;
  padding: 17px;
}

.transport strong {
  font-family: var(--mono);
  font-size: var(--fs-sm);
}

.contract-section h2 {
  max-width: 18ch;
}

.contract-intro {
  align-items: start;
  display: grid;
  gap: 32px;
  grid-template-columns: minmax(0, 0.78fr) minmax(0, 1.22fr);
}

.schema-steps {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.schema-step {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  display: grid;
  gap: 7px;
  min-height: 154px;
  padding: 16px;
}

.schema-step span {
  color: var(--green);
  font-family: var(--mono);
  font-size: var(--fs-lg);
  font-weight: 900;
}

.schema-step strong {
  line-height: 1.2;
}

.schema-step small {
  color: var(--muted);
  line-height: 1.4;
}

.tech-tabs {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  margin-top: 26px;
  overflow: hidden;
}

.tab-list {
  background: #fbfcfe;
  border-bottom: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  padding: 8px;
}

.tab-button {
  background: transparent;
  border: 1px solid transparent;
  border-radius: 7px;
  color: var(--muted);
  cursor: pointer;
  font: 800 13px/1 var(--sans);
  min-height: 36px;
  padding: 10px 12px;
}

.tab-button:hover,
.tab-button:focus-visible {
  border-color: var(--line);
  color: var(--ink);
  outline: none;
}

.tab-button.active {
  background: var(--ink);
  color: #fff;
}

.tech-panel {
  display: none;
  gap: 24px;
  grid-template-columns: minmax(220px, 0.44fr) minmax(0, 1fr);
  padding: 22px;
}

.tech-panel.active {
  display: grid;
}

.tech-copy {
  min-width: 0;
}

.tech-copy span {
  color: var(--green);
  display: block;
  font-family: var(--mono);
  font-size: var(--fs-xs);
  font-weight: 900;
  margin-bottom: 12px;
}

.tech-copy h3 {
  font-size: var(--fs-2xl);
  line-height: 1.13;
}

.tech-copy p {
  color: var(--muted);
  margin: 12px 0 0;
}

.tech-code-grid {
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  min-width: 0;
}

.code-block {
  background: var(--code);
  border: 1px solid rgba(255,255,255,.12);
  border-radius: 8px;
  color: #E0E7FF;
  min-width: 0;
  overflow: hidden;
}

.code-block span {
  border-bottom: 1px solid rgba(255,255,255,.12);
  color: #9ca3af;
  display: block;
  font-family: var(--mono);
  font-size: var(--fs-xs);
  font-weight: 800;
  padding: 10px 14px;
}

.code-block pre {
  font-family: var(--mono);
  font-size: var(--fs-xs);
  line-height: 1.6;
  overflow-x: auto;
  padding: 16px;
}

.roadmap ol {
  counter-reset: roadmap;
  display: grid;
  gap: 10px;
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
}

.roadmap li {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--muted);
  padding: 14px 16px 14px 48px;
  position: relative;
}

.roadmap li::before {
  color: var(--amber);
  content: counter(roadmap);
  counter-increment: roadmap;
  font-family: var(--mono);
  font-weight: 900;
  left: 18px;
  position: absolute;
}

footer {
  border-top: 1px solid var(--line);
  color: var(--muted);
  display: flex;
  font-family: var(--mono);
  font-size: var(--fs-xs);
  gap: 14px;
  justify-content: space-between;
  margin: 0 auto;
  max-width: 1180px;
  padding: 24px 48px 40px;
}

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

.docs-layout {
  align-items: start;
  display: grid;
  gap: 34px;
  grid-template-columns: 260px minmax(0, 1fr);
}

aside {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  display: grid;
  gap: 6px;
  padding: 10px;
  position: sticky;
  top: 86px;
}

aside a {
  border-radius: 6px;
  display: grid;
  gap: 4px;
  padding: 10px;
}

aside a.active,
aside a:hover {
  background: var(--accent-soft);
}

aside span {
  font-size: var(--fs-sm);
  font-weight: 850;
  text-transform: capitalize;
}

aside small {
  color: var(--muted);
  font-size: var(--fs-xs);
  line-height: 1.35;
}

.doc-body {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 42px;
}

.doc-body h1 {
  font-size: var(--h1);
  max-width: none;
}

.doc-body h2 {
  font-size: var(--h2);
  margin-top: 34px;
}

.doc-body h3 {
  margin-top: 24px;
}

.doc-body p {
  color: var(--muted);
  margin: 13px 0 0;
}

.doc-body a {
  color: var(--accent);
  font-weight: 700;
}

.doc-body ul {
  color: var(--muted);
  margin: 16px 0 0;
  padding-left: 22px;
}

.doc-body li + li {
  margin-top: 8px;
}

@media (max-width: 980px) {
  .hero,
  .split,
  .runtime-map,
  .contract-intro,
  .tech-panel,
  .docs-layout {
    grid-template-columns: 1fr;
  }

  .feature-grid,
  .facts,
  .grid,
  .schema-steps,
  .transport-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .tech-code-grid {
    grid-template-columns: 1fr;
  }

  aside {
    position: static;
  }
}

@media (max-width: 720px) {
  .topbar,
  footer {
    align-items: flex-start;
    flex-direction: column;
    padding-left: 20px;
    padding-right: 20px;
  }

  nav {
    flex-wrap: wrap;
  }

  main {
    padding: 34px 20px 58px;
  }

  h1 {
    font-size: var(--h1);
  }

  h2 {
    font-size: var(--h2);
  }

  .hero {
    min-height: auto;
  }

  .feature-grid,
  .facts,
  .grid,
  .schema-steps,
  .transport-grid {
    grid-template-columns: 1fr;
  }

  .tab-list {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .doc-body {
    padding: 24px;
  }
}

.showcase {
  margin: 24px 0 0;
}

.showcase img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--line, #e6e9ef);
  border-radius: 12px;
}

.showcase figcaption {
  margin-top: 10px;
  color: var(--ink2, #475569);
  font-size: var(--fs-sm);
}