@font-face {
  font-family: "Geologica";
  src: url("../fonts/geologica-latin-variable.woff2") format("woff2");
  font-style: normal;
  font-weight: 400 700;
  font-display: swap;
}

:root {
  color-scheme: light;
  --ink: oklch(27% 0.052 270);
  --ink-soft: oklch(39% 0.043 270);
  --violet: oklch(57% 0.19 285);
  --violet-deep: oklch(47% 0.18 285);
  --teal: oklch(73% 0.13 185);
  --teal-deep: oklch(56% 0.11 185);
  --path: oklch(78% 0.045 270);
  --paper: oklch(98.5% 0.006 270);
  --surface: oklch(95.8% 0.015 270);
  --surface-strong: oklch(92.5% 0.024 270);
  --line: oklch(86% 0.025 270);
  --inverse: oklch(97% 0.008 270);
  --code-bg: oklch(23% 0.045 270);
  --code-line: oklch(36% 0.055 270);
  --focus: oklch(65% 0.17 285);
  --font-sans: "Geologica", "Avenir Next", "Segoe UI", sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", "Cascadia Code", "Roboto Mono", monospace;
  --radius-sm: 0.45rem;
  --radius-md: 0.9rem;
  --radius-lg: 1.4rem;
  --shadow-low: 0 1rem 3rem oklch(23% 0.045 270 / 0.09);
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --page: min(92vw, 76rem);
  --reading: 70ch;
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --ink: oklch(94% 0.018 270);
  --ink-soft: oklch(76% 0.026 270);
  --violet: oklch(72% 0.16 285);
  --violet-deep: oklch(79% 0.13 285);
  --teal: oklch(78% 0.12 185);
  --teal-deep: oklch(70% 0.11 185);
  --path: oklch(49% 0.05 270);
  --paper: oklch(19% 0.035 270);
  --surface: oklch(23% 0.043 270);
  --surface-strong: oklch(28% 0.052 270);
  --line: oklch(34% 0.05 270);
  --inverse: oklch(18% 0.035 270);
  --code-bg: oklch(15% 0.03 270);
  --code-line: oklch(32% 0.05 270);
  --focus: oklch(80% 0.12 185);
  --shadow-low: 0 1rem 3rem oklch(5% 0.02 270 / 0.3);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 6rem;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.65;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

body::before {
  position: fixed;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(to right, var(--line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--line) 1px, transparent 1px);
  background-size: 4rem 4rem;
  opacity: 0.22;
  content: "";
  pointer-events: none;
  mask-image: linear-gradient(to bottom, black, transparent 48rem);
}

::selection {
  background: color-mix(in oklch, var(--teal) 42%, transparent);
}

a {
  color: inherit;
  text-decoration-color: color-mix(in oklch, var(--violet) 65%, transparent);
  text-decoration-thickness: 0.1em;
  text-underline-offset: 0.2em;
}

a:hover {
  text-decoration-color: var(--violet);
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

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

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

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

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

h1,
h2,
h3,
h4 {
  line-height: 1.08;
  letter-spacing: -0.035em;
  text-wrap: balance;
}

h1 {
  max-width: 12ch;
  margin-bottom: 1.5rem;
  font-size: clamp(3.4rem, 8.2vw, 7.8rem);
  font-weight: 620;
}

h2 {
  max-width: 15ch;
  margin-bottom: 1.2rem;
  font-size: clamp(2.35rem, 5vw, 4.5rem);
  font-weight: 590;
}

h3 {
  font-size: clamp(1.4rem, 2.4vw, 2rem);
  font-weight: 590;
}

code,
pre {
  font-family: var(--font-mono);
}

code:not(pre code) {
  padding: 0.12em 0.38em;
  border: 1px solid var(--line);
  border-radius: 0.35rem;
  background: var(--surface);
  font-size: 0.88em;
}

.skip-link {
  position: fixed;
  top: 0.75rem;
  left: 0.75rem;
  z-index: 100;
  padding: 0.7rem 1rem;
  border-radius: var(--radius-sm);
  background: var(--ink);
  color: var(--inverse);
  transform: translateY(-160%);
  transition: transform 180ms var(--ease-out);
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid color-mix(in oklch, var(--line) 80%, transparent);
  background: color-mix(in oklch, var(--paper) 92%, transparent);
}

@supports (backdrop-filter: blur(1rem)) {
  .site-header {
    backdrop-filter: blur(1rem);
  }
}

.site-nav {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  width: var(--page);
  min-height: 4.75rem;
  margin-inline: auto;
  gap: 2rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.72rem;
  font-size: 1.05rem;
  font-weight: 650;
  letter-spacing: -0.025em;
  text-decoration: none;
}

.brand img {
  width: 2rem;
  height: 2rem;
}

:root[data-theme="dark"] .brand img {
  filter: brightness(0) invert(1);
}

.nav-links {
  display: flex;
  justify-content: center;
  align-items: center;
  margin: 0;
  padding: 0;
  gap: clamp(1rem, 3vw, 2.25rem);
  list-style: none;
}

.nav-links a {
  position: relative;
  font-size: 0.9rem;
  font-weight: 520;
  text-decoration: none;
}

.nav-links a::after {
  position: absolute;
  right: 0;
  bottom: -0.6rem;
  left: 0;
  height: 2px;
  background: var(--violet);
  content: "";
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 220ms var(--ease-out);
}

.nav-links a:hover::after,
.nav-links a[aria-current="page"]::after {
  transform: scaleX(1);
}

.nav-tools {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.icon-button,
.menu-button {
  display: inline-grid;
  width: 2.55rem;
  height: 2.55rem;
  padding: 0;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: var(--surface);
  color: var(--ink);
  cursor: pointer;
  transition:
    background-color 180ms var(--ease-out),
    border-color 180ms var(--ease-out),
    transform 180ms var(--ease-out);
}

.icon-button:hover,
.menu-button:hover {
  border-color: var(--violet);
  background: var(--surface-strong);
  transform: translateY(-1px);
}

.icon-button svg,
.menu-button svg {
  width: 1.15rem;
  height: 1.15rem;
}

.menu-button {
  display: none;
}

.page-shell {
  width: var(--page);
  margin-inline: auto;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(20rem, 0.92fr);
  min-height: calc(100svh - 4.75rem);
  align-items: center;
  gap: clamp(3rem, 7vw, 7rem);
  padding-block: clamp(4.5rem, 9vw, 8rem);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  margin-bottom: 1.8rem;
  gap: 0.7rem;
  color: var(--ink-soft);
  font-size: 0.78rem;
  font-weight: 650;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.eyebrow::before {
  width: 2.2rem;
  height: 2px;
  background: linear-gradient(90deg, var(--violet) 50%, var(--teal) 50%);
  content: "";
}

.hero-lede {
  max-width: 60ch;
  margin-bottom: 2.2rem;
  color: var(--ink-soft);
  font-size: clamp(1.08rem, 1.8vw, 1.32rem);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.85rem;
}

.button {
  display: inline-flex;
  min-height: 3rem;
  align-items: center;
  justify-content: center;
  padding: 0.72rem 1.25rem;
  gap: 0.55rem;
  border: 1px solid var(--ink);
  border-radius: 999px;
  font-size: 0.92rem;
  font-weight: 620;
  text-decoration: none;
  transition:
    transform 200ms var(--ease-out),
    box-shadow 200ms var(--ease-out),
    background-color 200ms var(--ease-out);
}

.button:hover {
  transform: translateY(-2px);
}

.button-primary {
  background: var(--ink);
  color: var(--inverse);
  box-shadow: 0 0.7rem 1.8rem color-mix(in oklch, var(--ink) 18%, transparent);
}

.button-primary:hover {
  box-shadow: 0 1rem 2.4rem color-mix(in oklch, var(--ink) 24%, transparent);
}

.button-secondary {
  background: transparent;
}

.button svg {
  width: 1rem;
  height: 1rem;
}

.hero-visual {
  position: relative;
  min-height: clamp(29rem, 48vw, 39rem);
  isolation: isolate;
}

.orbit {
  position: absolute;
  top: 1rem;
  right: 0;
  width: min(100%, 32rem);
  aspect-ratio: 1;
}

.orbit-ring,
.orbit-ring::before,
.orbit-ring::after {
  position: absolute;
  border-radius: 50%;
  content: "";
}

.orbit-ring {
  inset: 7%;
  border: 2px solid var(--path);
  animation: orbit-turn 18s linear infinite;
}

.orbit-ring::before,
.orbit-ring::after {
  width: 0.8rem;
  height: 0.8rem;
  border: 3px solid var(--paper);
}

.orbit-ring::before {
  top: 16%;
  right: 10%;
  background: var(--violet);
  box-shadow: 1.8rem 4.6rem 0 -2px var(--violet);
}

.orbit-ring::after {
  right: 9%;
  bottom: 18%;
  background: var(--teal);
  box-shadow: -2.1rem 4rem 0 -2px var(--teal);
}

.orbit-mark {
  position: absolute;
  inset: 25%;
  width: 50%;
  filter: drop-shadow(0 1.4rem 2rem color-mix(in oklch, var(--ink) 14%, transparent));
}

:root[data-theme="dark"] .orbit-mark {
  filter: brightness(0) invert(1) drop-shadow(0 1.4rem 2rem oklch(8% 0.03 270 / 0.28));
}

.model-note {
  position: absolute;
  z-index: 2;
  max-width: 14rem;
  padding: 0.85rem 1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--paper);
  box-shadow: var(--shadow-low);
  color: var(--ink-soft);
  font-size: 0.78rem;
  line-height: 1.45;
}

.model-note strong {
  display: block;
  margin-bottom: 0.18rem;
  color: var(--ink);
  font-size: 0.84rem;
}

.model-note-light {
  top: 5%;
  left: 0;
}

.model-note-native {
  right: -2%;
  bottom: 10%;
}

.code-window {
  position: absolute;
  right: 8%;
  bottom: 0;
  z-index: 3;
  width: min(94%, 28rem);
  overflow: hidden;
  border: 1px solid var(--code-line);
  border-radius: var(--radius-md);
  background: var(--code-bg);
  color: oklch(91% 0.02 270);
  box-shadow: 0 1.7rem 4rem oklch(10% 0.04 270 / 0.25);
}

.code-titlebar {
  display: flex;
  min-height: 2.6rem;
  align-items: center;
  justify-content: space-between;
  padding-inline: 1rem;
  border-bottom: 1px solid var(--code-line);
  color: oklch(72% 0.03 270);
  font-family: var(--font-mono);
  font-size: 0.72rem;
}

.window-dots {
  display: flex;
  gap: 0.35rem;
}

.window-dots span {
  width: 0.48rem;
  height: 0.48rem;
  border-radius: 50%;
  background: var(--path);
}

.window-dots span:nth-child(2) {
  background: var(--violet);
}

.window-dots span:nth-child(3) {
  background: var(--teal);
}

.code-window pre,
.code-panel pre {
  margin: 0;
  overflow-x: auto;
  padding: 1.35rem;
  font-size: clamp(0.72rem, 1.4vw, 0.88rem);
  line-height: 1.8;
  tab-size: 3;
}

.token-keyword {
  color: oklch(79% 0.13 285);
}

.token-type {
  color: oklch(82% 0.1 185);
}

.token-comment {
  color: oklch(65% 0.035 270);
}

.token-string,
.token-number,
.token-attribute {
  color: oklch(82% 0.1 185);
}

.token-operator {
  color: oklch(76% 0.045 270);
}

.status-strip {
  border-block: 1px solid var(--line);
  background: var(--surface);
}

.status-inner {
  display: grid;
  grid-template-columns: 1.2fr 1fr 1fr;
  width: var(--page);
  margin-inline: auto;
}

.status-item {
  padding: 1.25rem clamp(1rem, 3vw, 2rem);
  border-right: 1px solid var(--line);
  color: var(--ink-soft);
  font-size: 0.82rem;
}

.status-item:first-child {
  padding-left: 0;
}

.status-item:last-child {
  border-right: 0;
}

.status-item strong {
  display: block;
  margin-bottom: 0.14rem;
  color: var(--ink);
  font-size: 0.88rem;
}

.section {
  padding-block: clamp(6rem, 12vw, 11rem);
}

.section-heading {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(18rem, 0.65fr);
  align-items: end;
  margin-bottom: clamp(3rem, 7vw, 6rem);
  gap: 3rem;
}

.section-heading p {
  max-width: 52ch;
  margin-bottom: 0.4rem;
  color: var(--ink-soft);
  font-size: 1.05rem;
}

.lane-stage {
  overflow: hidden;
  border-radius: var(--radius-lg);
  background: var(--ink);
  color: var(--inverse);
}

.lane {
  display: grid;
  grid-template-columns: 15rem 1fr;
  min-height: 13rem;
  align-items: stretch;
  border-bottom: 1px solid color-mix(in oklch, var(--path) 28%, transparent);
}

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

.lane-copy {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 2rem;
  border-right: 1px solid color-mix(in oklch, var(--path) 28%, transparent);
}

.lane-number {
  color: color-mix(in oklch, var(--path) 68%, transparent);
  font-family: var(--font-mono);
  font-size: 0.75rem;
}

.lane-copy h3 {
  margin: 0;
  color: var(--inverse);
}

.lane-flow {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  gap: clamp(0.65rem, 2vw, 1.6rem);
}

.flow-node {
  min-width: 5.2rem;
  padding: 0.8rem 0.9rem;
  border: 1px solid color-mix(in oklch, var(--path) 50%, transparent);
  border-radius: var(--radius-sm);
  background: color-mix(in oklch, var(--ink) 86%, var(--path));
  color: var(--inverse);
  font-family: var(--font-mono);
  font-size: 0.76rem;
  text-align: center;
}

.flow-node-violet {
  border-color: var(--violet);
}

.flow-node-teal {
  border-color: var(--teal);
}

.flow-arrow {
  position: relative;
  flex: 1 1 2rem;
  max-width: 5rem;
  height: 1px;
  background: color-mix(in oklch, var(--path) 70%, transparent);
}

.flow-arrow::after {
  position: absolute;
  top: -3px;
  right: 0;
  width: 7px;
  height: 7px;
  border-top: 1px solid var(--path);
  border-right: 1px solid var(--path);
  content: "";
  transform: rotate(45deg);
}

.task-stack {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.45rem;
}

.task-stack .flow-node {
  min-width: 4.3rem;
}

.mechanics {
  display: grid;
  grid-template-columns: 1fr 1.15fr;
  align-items: start;
  gap: clamp(3rem, 8vw, 7rem);
}

.mechanics-copy {
  position: sticky;
  top: 8rem;
}

.mechanics-copy p {
  max-width: 52ch;
  color: var(--ink-soft);
}

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

.mechanic-item {
  display: grid;
  grid-template-columns: 3rem 1fr;
  padding-block: 2rem;
  border-bottom: 1px solid var(--line);
  gap: 1.2rem;
}

.mechanic-index {
  color: var(--violet);
  font-family: var(--font-mono);
  font-size: 0.75rem;
}

.mechanic-item h3 {
  margin-bottom: 0.55rem;
  font-size: 1.25rem;
}

.mechanic-item p {
  max-width: 55ch;
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.94rem;
}

.io-band {
  position: relative;
  overflow: hidden;
  padding-block: clamp(5rem, 10vw, 8rem);
  background: var(--violet-deep);
  color: oklch(98% 0.01 285);
}

.io-band::after {
  position: absolute;
  top: -45%;
  right: -12%;
  width: 38rem;
  height: 38rem;
  border: 1px solid color-mix(in oklch, var(--path) 45%, transparent);
  border-radius: 50%;
  box-shadow:
    0 0 0 5rem color-mix(in oklch, var(--path) 8%, transparent),
    0 0 0 10rem color-mix(in oklch, var(--path) 6%, transparent);
  content: "";
}

.io-inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 0.75fr 1fr;
  width: var(--page);
  margin-inline: auto;
  gap: clamp(3rem, 8vw, 8rem);
}

.io-inner h2 {
  color: inherit;
}

.io-intro {
  max-width: 51ch;
  color: oklch(93% 0.025 285 / 0.82);
}

.io-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.io-list li {
  display: grid;
  grid-template-columns: 9rem 1fr;
  padding-block: 1rem;
  border-bottom: 1px solid oklch(96% 0.02 285 / 0.22);
  gap: 1rem;
}

.io-list strong {
  font-size: 0.9rem;
}

.io-list span {
  color: oklch(94% 0.02 285 / 0.76);
  font-size: 0.9rem;
}

.constraint-layout {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: clamp(3rem, 8vw, 8rem);
}

.constraint-lede p {
  max-width: 52ch;
  color: var(--ink-soft);
}

.constraint-table {
  width: 100%;
  border-collapse: collapse;
}

.constraint-table th,
.constraint-table td {
  padding: 1.2rem 0.8rem;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

.constraint-table th {
  color: var(--ink-soft);
  font-size: 0.74rem;
  font-weight: 620;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.constraint-table td {
  font-size: 0.9rem;
}

.history {
  display: grid;
  grid-template-columns: minmax(16rem, 0.55fr) 1fr;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--surface);
}

.history-visual {
  display: grid;
  min-height: 28rem;
  place-items: center;
  background: var(--ink);
}

.history-visual img {
  width: min(65%, 17rem);
  filter: brightness(0) invert(1);
}

.history-copy {
  align-self: center;
  padding: clamp(2rem, 7vw, 6rem);
}

.history-copy p {
  max-width: 58ch;
  color: var(--ink-soft);
}

.final-cta {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: end;
  padding-block: clamp(5rem, 10vw, 9rem);
  gap: 2rem;
  border-top: 1px solid var(--line);
}

.final-cta h2 {
  max-width: 16ch;
  margin: 0;
}

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

.footer-inner {
  display: grid;
  grid-template-columns: 1fr auto;
  width: var(--page);
  margin-inline: auto;
  padding-block: 2.2rem;
  gap: 1rem;
  color: var(--ink-soft);
  font-size: 0.8rem;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1.3rem;
}

.footer-links a {
  text-decoration: none;
}

/* Guide and architecture pages */
.doc-hero {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  align-items: end;
  padding-block: clamp(5rem, 10vw, 9rem) clamp(3.5rem, 7vw, 6rem);
  gap: clamp(3rem, 8vw, 8rem);
  border-bottom: 1px solid var(--line);
}

.doc-hero h1 {
  max-width: 10ch;
  margin: 0;
  font-size: clamp(3.2rem, 7vw, 6.5rem);
}

.doc-hero-copy {
  max-width: 58ch;
  color: var(--ink-soft);
  font-size: clamp(1.05rem, 1.6vw, 1.25rem);
}

.breadcrumb {
  display: flex;
  margin: 0 0 1.3rem;
  padding: 0;
  gap: 0.55rem;
  color: var(--ink-soft);
  font-size: 0.75rem;
  list-style: none;
}

.breadcrumb li + li::before {
  margin-right: 0.55rem;
  color: var(--path);
  content: "/";
}

.docs-layout {
  display: grid;
  grid-template-columns: 15rem minmax(0, 1fr);
  align-items: start;
  padding-block: clamp(3rem, 7vw, 6rem) 8rem;
  gap: clamp(3rem, 7vw, 7rem);
}

.toc {
  position: sticky;
  top: 7rem;
}

.toc-title {
  margin-bottom: 1rem;
  color: var(--ink-soft);
  font-size: 0.72rem;
  font-weight: 650;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.toc ol {
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
  list-style: none;
}

.toc a {
  display: block;
  padding-block: 0.7rem;
  border-bottom: 1px solid var(--line);
  color: var(--ink-soft);
  font-size: 0.82rem;
  text-decoration: none;
  transition: color 160ms var(--ease-out), padding-left 160ms var(--ease-out);
}

.toc a:hover,
.toc a[aria-current="true"] {
  padding-left: 0.35rem;
  color: var(--violet);
}

.prose {
  min-width: 0;
  max-width: 52rem;
}

.prose > section {
  padding-block: 1.5rem 4.5rem;
  border-bottom: 1px solid var(--line);
}

.prose > section:first-child {
  padding-top: 0;
}

.prose > section:last-child {
  border-bottom: 0;
}

.prose h2 {
  max-width: 18ch;
  margin-bottom: 1.3rem;
  font-size: clamp(2rem, 4vw, 3.3rem);
}

.prose h3 {
  margin-top: 2.4rem;
  margin-bottom: 0.8rem;
  font-size: 1.3rem;
}

.prose p,
.prose li {
  max-width: var(--reading);
  color: var(--ink-soft);
}

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

.prose ul,
.prose ol:not(.steps) {
  padding-left: 1.25rem;
}

.prose li + li {
  margin-top: 0.55rem;
}

.step-label {
  display: inline-block;
  margin-bottom: 0.8rem;
  color: var(--violet);
  font-family: var(--font-mono);
  font-size: 0.74rem;
}

.code-panel {
  position: relative;
  margin-block: 1.5rem;
  margin-inline: 0;
  overflow: hidden;
  border: 1px solid var(--code-line);
  border-radius: var(--radius-md);
  background: var(--code-bg);
  color: oklch(91% 0.02 270);
}

.code-panel figcaption {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--code-line);
  color: oklch(68% 0.035 270);
  font-family: var(--font-mono);
  font-size: 0.72rem;
}

.copy-button {
  position: absolute;
  top: 0.55rem;
  right: 0.55rem;
  padding: 0.35rem 0.6rem;
  border: 1px solid var(--code-line);
  border-radius: 0.35rem;
  background: color-mix(in oklch, var(--code-bg) 86%, var(--path));
  color: oklch(78% 0.03 270);
  font-family: var(--font-mono);
  font-size: 0.67rem;
  cursor: pointer;
}

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

.callout {
  display: grid;
  grid-template-columns: auto 1fr;
  margin-block: 1.5rem;
  padding: 1.15rem 1.25rem;
  gap: 1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--surface);
}

.callout-symbol {
  display: grid;
  width: 1.8rem;
  height: 1.8rem;
  place-items: center;
  border-radius: 50%;
  background: var(--violet);
  color: oklch(98% 0.01 285);
  font-family: var(--font-mono);
  font-size: 0.75rem;
}

.callout-teal .callout-symbol {
  background: var(--teal);
  color: oklch(27% 0.052 270);
}

:root[data-theme="dark"] .callout-symbol {
  color: oklch(27% 0.052 270);
}

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

.decision-list {
  margin-block: 2rem;
  border-top: 1px solid var(--line);
}

.decision-row {
  display: grid;
  grid-template-columns: 11rem 1fr;
  padding-block: 1.15rem;
  border-bottom: 1px solid var(--line);
  gap: 1.5rem;
}

.decision-row dt {
  color: var(--ink);
  font-weight: 600;
}

.decision-row dd {
  margin: 0;
  color: var(--ink-soft);
}

.architecture-figure {
  margin-block: 2rem;
  margin-inline: 0;
  padding: clamp(1rem, 4vw, 2.5rem);
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--surface);
}

.architecture-figure svg {
  min-width: 42rem;
}

.architecture-figure text {
  fill: var(--ink);
  font-family: var(--font-sans);
}

.architecture-figure .diagram-muted {
  fill: var(--ink-soft);
  font-size: 12px;
}

.architecture-figure .diagram-box {
  fill: var(--paper);
  stroke: var(--line);
}

.architecture-figure .diagram-violet {
  fill: color-mix(in oklch, var(--violet) 18%, var(--paper));
  stroke: var(--violet);
}

.architecture-figure .diagram-teal {
  fill: color-mix(in oklch, var(--teal) 22%, var(--paper));
  stroke: var(--teal-deep);
}

.architecture-figure .diagram-line {
  fill: none;
  stroke: var(--path);
  stroke-width: 2;
}

.architecture-figure .diagram-accent {
  fill: none;
  stroke: var(--violet);
  stroke-width: 2.5;
  stroke-dasharray: 6 7;
  animation: dash-flow 12s linear infinite;
}

.state-rail {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  margin-block: 2rem;
  padding: 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  list-style: none;
}

.state-rail li {
  position: relative;
  min-width: 0;
  padding: 1.3rem 0.8rem;
  border-right: 1px solid var(--line);
  color: var(--ink-soft);
  font-family: var(--font-mono);
  font-size: 0.74rem;
  text-align: center;
}

.state-rail li + li {
  margin-top: 0;
}

.state-rail li:last-child {
  border-right: 0;
}

.state-rail li::after {
  position: absolute;
  top: 50%;
  right: -5px;
  z-index: 2;
  width: 8px;
  height: 8px;
  border-top: 1px solid var(--path);
  border-right: 1px solid var(--path);
  background: var(--paper);
  content: "";
  transform: translateY(-50%) rotate(45deg);
}

.state-rail li:last-child::after {
  display: none;
}

@keyframes orbit-turn {
  to {
    transform: rotate(360deg);
  }
}

@keyframes dash-flow {
  to {
    stroke-dashoffset: -130;
  }
}

@media (max-width: 900px) {
  .site-nav {
    grid-template-columns: 1fr auto;
  }

  .menu-button {
    display: inline-grid;
  }

  .nav-links {
    position: absolute;
    top: calc(100% + 1px);
    right: 0;
    left: 0;
    display: grid;
    justify-content: stretch;
    padding: 1rem 4vw 1.4rem;
    gap: 0;
    border-bottom: 1px solid var(--line);
    background: var(--paper);
    transform: translateY(-0.8rem);
    opacity: 0;
    pointer-events: none;
    transition:
      transform 180ms var(--ease-out),
      opacity 180ms var(--ease-out);
  }

  .nav-links[data-open="true"] {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .nav-links a {
    display: block;
    padding-block: 0.85rem;
    border-bottom: 1px solid var(--line);
  }

  .nav-links a::after {
    display: none;
  }

  .hero,
  .section-heading,
  .mechanics,
  .io-inner,
  .constraint-layout,
  .doc-hero {
    grid-template-columns: 1fr;
  }

  .hero {
    padding-top: 5rem;
  }

  .hero-visual {
    min-height: 34rem;
  }

  .mechanics-copy {
    position: static;
  }

  .history {
    grid-template-columns: 0.72fr 1fr;
  }

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

  .toc {
    position: static;
    min-width: 0;
  }

  .toc ol {
    display: flex;
    overflow-x: auto;
    border: 0;
    gap: 0.5rem;
    scrollbar-width: thin;
  }

  .toc li {
    flex: none;
  }

  .toc a {
    padding: 0.5rem 0.8rem;
    border: 1px solid var(--line);
    border-radius: 999px;
  }

  .toc a:hover,
  .toc a[aria-current="true"] {
    padding-left: 0.8rem;
  }
}

@media (max-width: 640px) {
  body::before {
    background-size: 2.5rem 2.5rem;
  }

  .site-nav {
    width: min(92vw, 36rem);
  }

  h1 {
    font-size: clamp(3.1rem, 15vw, 4.8rem);
  }

  .hero-visual {
    min-height: 29rem;
  }

  .model-note {
    max-width: 11rem;
  }

  .model-note-native {
    right: 0;
  }

  .code-window {
    right: 0;
    width: 100%;
  }

  .status-inner {
    grid-template-columns: 1fr;
    width: min(92vw, 36rem);
  }

  .status-item,
  .status-item:first-child {
    padding: 0.9rem 0;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .status-item:last-child {
    border-bottom: 0;
  }

  .lane {
    grid-template-columns: 1fr;
  }

  .lane-copy {
    min-height: 7rem;
    padding: 1.3rem;
    border-right: 0;
    border-bottom: 1px solid color-mix(in oklch, var(--path) 28%, transparent);
  }

  .lane-flow {
    padding: 1.5rem 1rem;
    gap: 0.45rem;
  }

  .flow-node {
    min-width: 3.8rem;
    padding: 0.65rem 0.45rem;
    font-size: 0.65rem;
  }

  .task-stack .flow-node:nth-child(n + 3) {
    display: none;
  }

  .io-list li,
  .decision-row {
    grid-template-columns: 1fr;
    gap: 0.25rem;
  }

  .constraint-table {
    display: block;
    overflow-x: auto;
  }

  .history {
    grid-template-columns: 1fr;
  }

  .history-visual {
    min-height: 18rem;
  }

  .final-cta,
  .footer-inner {
    grid-template-columns: 1fr;
  }

  .final-cta {
    align-items: start;
  }

  .state-rail {
    grid-template-columns: 1fr;
  }

  .state-rail li {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .state-rail li:last-child {
    border-bottom: 0;
  }

  .state-rail li::after {
    top: auto;
    right: 50%;
    bottom: -5px;
    transform: translateX(50%) rotate(135deg);
  }
}

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

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}

@media print {
  .site-header,
  .toc,
  .copy-button,
  .site-footer {
    display: none;
  }

  body::before {
    display: none;
  }

  .docs-layout {
    display: block;
  }
}