:root {
  color-scheme: light;
  --paper: oklch(97.5% 0.012 80);
  --paper-raised: oklch(99% 0.007 80);
  --paper-deep: oklch(92.5% 0.021 80);
  --ink: oklch(21% 0.026 52);
  --ink-soft: oklch(42% 0.025 52);
  --ink-faint: oklch(62% 0.019 52);
  --rule: oklch(79% 0.018 52);
  --signal: oklch(54% 0.19 32);
  --signal-dark: oklch(42% 0.16 32);
  --signal-pale: oklch(91% 0.055 32);
  --verified: oklch(41% 0.095 162);
  --verified-pale: oklch(91% 0.04 162);
  --font-display: "Familjen Grotesk", "Arial Narrow", sans-serif;
  --font-body: "Public Sans", "Helvetica Neue", sans-serif;
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-body: 1rem;
  --text-lead: 1.25rem;
  --text-section: clamp(2.75rem, 7vw, 6.5rem);
  --text-hero: clamp(4rem, 10.5vw, 9.6rem);
  --space-2xs: 0.25rem;
  --space-xs: 0.5rem;
  --space-sm: 0.75rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;
  --space-5xl: clamp(7rem, 14vw, 12rem);
  --page: min(92vw, 86rem);
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-toggle: cubic-bezier(0.65, 0, 0.35, 1);
  --duration-fast: 140ms;
  --duration-state: 260ms;
  --duration-enter: 720ms;
  --z-sticky: 200;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  background: var(--paper);
}

body {
  margin: 0;
  min-width: 20rem;
  color: var(--ink);
  background-color: var(--paper);
  background-image:
    linear-gradient(to right, color-mix(in oklch, var(--rule) 22%, transparent) 1px, transparent 1px),
    linear-gradient(to bottom, color-mix(in oklch, var(--rule) 13%, transparent) 1px, transparent 1px);
  background-size: min(7vw, 5.5rem) min(7vw, 5.5rem);
  font-family: var(--font-body);
  font-size: var(--text-body);
  line-height: 1.55;
  font-kerning: normal;
  text-rendering: optimizeLegibility;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: -1;
  background: color-mix(in oklch, var(--paper) 86%, transparent);
}

::selection {
  color: var(--paper-raised);
  background: var(--signal);
}

a {
  color: inherit;
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.18em;
}

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

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

button {
  font: inherit;
}

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

h1,
h2,
h3 {
  font-family: var(--font-display);
  font-weight: 580;
  letter-spacing: -0.04em;
  text-wrap: balance;
}

code,
pre {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-variant-ligatures: none;
}

.skip-link {
  position: fixed;
  top: var(--space-md);
  left: var(--space-md);
  z-index: 1000;
  padding: var(--space-sm) var(--space-md);
  color: var(--paper-raised);
  background: var(--ink);
  transform: translateY(-180%);
  transition: transform var(--duration-state) var(--ease-out);
}

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

.reading-progress {
  position: fixed;
  inset: 0 0 auto;
  z-index: calc(var(--z-sticky) + 10);
  height: 3px;
  background: var(--paper-deep);
}

.reading-progress span {
  display: block;
  width: 100%;
  height: 100%;
  background: var(--signal);
  transform: scaleX(0);
  transform-origin: left;
}

.site-header {
  width: var(--page);
  min-height: 5.5rem;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: var(--space-xl);
  border-bottom: 1px solid var(--ink);
}

.wordmark {
  width: fit-content;
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 650;
  letter-spacing: -0.035em;
  text-decoration: none;
}

.wordmark svg {
  width: 1.75rem;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.4;
}

.site-header nav {
  display: flex;
  gap: var(--space-xl);
}

.site-header nav a,
.header-source {
  position: relative;
  min-height: 2.75rem;
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: var(--text-sm);
  font-weight: 650;
  text-decoration: none;
}

.site-header nav a::after {
  content: "";
  position: absolute;
  inset: auto 0 0;
  height: 1px;
  background: var(--signal);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform var(--duration-state) var(--ease-out);
}

.site-header nav a:hover::after,
.site-header nav a.is-current::after {
  transform: scaleX(1);
  transform-origin: left;
}

.header-source {
  justify-self: end;
}

.hero {
  width: var(--page);
  min-height: calc(100svh - 5.5rem);
  margin: 0 auto;
  padding: clamp(4rem, 8vw, 8rem) 0 var(--space-3xl);
  display: grid;
  grid-template-columns: minmax(0, 1.34fr) minmax(19rem, 0.66fr);
  grid-template-areas:
    "copy object"
    "proof proof";
  gap: clamp(4rem, 8vw, 8rem) clamp(2rem, 6vw, 7rem);
  align-items: center;
}

.hero-copy {
  grid-area: copy;
}

.section-index {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--text-xs);
  font-weight: 760;
  letter-spacing: 0.15em;
  line-height: 1;
  text-transform: uppercase;
}

.section-index::before {
  content: "";
  width: 1.9rem;
  height: 2px;
  background: var(--signal);
}

.hero h1 {
  max-width: 8.5ch;
  margin-top: 0;
  font-size: var(--text-hero);
  line-height: 0.82;
  letter-spacing: -0.045em;
}

.hero h1 em {
  color: var(--signal);
  font-style: normal;
}

.hero-lede {
  max-width: 43rem;
  margin-top: var(--space-2xl);
  font-size: clamp(1.08rem, 1.6vw, 1.38rem);
  line-height: 1.55;
  color: var(--ink-soft);
}

.hero-actions,
.finale-actions {
  margin-top: var(--space-2xl);
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.button {
  min-height: 3.25rem;
  padding: 0.8rem 1.15rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
  border: 1px solid transparent;
  border-radius: 2px;
  font-size: var(--text-sm);
  font-weight: 720;
  text-decoration: none;
  transition:
    transform var(--duration-fast) var(--ease-out),
    color var(--duration-fast) linear,
    background-color var(--duration-fast) linear,
    border-color var(--duration-fast) linear;
}

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

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

.button-primary {
  color: var(--paper-raised);
  background: var(--signal-dark);
}

.button-primary:hover {
  background: var(--signal);
}

.button-quiet {
  border-color: var(--rule);
}

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

.hero-object {
  grid-area: object;
  position: relative;
  width: min(100%, 34rem);
  justify-self: end;
  min-height: 34rem;
  display: grid;
  grid-template-rows: auto minmax(0, 1fr) auto auto auto;
  border: 1px solid var(--ink);
  background: var(--paper-raised);
}

.hero-object::before,
.hero-object::after {
  content: "";
  position: absolute;
  width: 1.1rem;
  height: 1.1rem;
  pointer-events: none;
}

.hero-object::before {
  inset: -1px auto auto -1px;
  background:
    linear-gradient(var(--signal), var(--signal)) top left / 100% 3px no-repeat,
    linear-gradient(var(--signal), var(--signal)) top left / 3px 100% no-repeat;
}

.hero-object::after {
  inset: auto -1px -1px auto;
  background:
    linear-gradient(var(--signal), var(--signal)) bottom right / 100% 3px no-repeat,
    linear-gradient(var(--signal), var(--signal)) bottom right / 3px 100% no-repeat;
}

.compiler-head,
.compiler-readout,
.compiler-controls {
  display: flex;
  justify-content: space-between;
  gap: var(--space-md);
}

.compiler-head {
  padding: var(--space-md);
  border-bottom: 1px solid var(--rule);
  font-family: "SFMono-Regular", Consolas, monospace;
  font-size: var(--text-xs);
  font-weight: 720;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.compiler-stage-number {
  color: var(--signal-dark);
}

.compiler-visual {
  width: 100%;
  min-height: 15rem;
  align-self: center;
  overflow: visible;
}

.compiler-guide,
.compiler-progress,
.compiler-source,
.compiler-root,
.compiler-packet {
  fill: none;
  stroke: var(--ink);
  stroke-width: 2;
  vector-effect: non-scaling-stroke;
}

.compiler-guide {
  stroke: var(--rule);
  stroke-dasharray: 3 7;
}

.compiler-progress {
  stroke: var(--signal);
  stroke-width: 3;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 560ms var(--ease-out);
}

.compiler-source,
.compiler-root,
.compiler-packet {
  opacity: 0.26;
  transform: translateY(0) scale(0.94);
  transform-box: fill-box;
  transform-origin: center;
  transition:
    opacity 420ms linear,
    transform 560ms var(--ease-out);
}

.compiler-source rect,
.compiler-packet rect,
.compiler-root-mark {
  fill: var(--paper-raised);
}

.compiler-source circle,
.compiler-root > circle:last-child,
.compiler-packet circle {
  fill: var(--signal);
  stroke: var(--paper-raised);
  stroke-width: 4;
}

.compiler-root > circle:not(:last-child) {
  stroke: var(--rule);
}

.compiler-root-mark {
  stroke: var(--signal-dark);
  stroke-width: 3;
}

.compiler-check {
  stroke: var(--verified);
  stroke-width: 5;
}

.hero-object[data-hero-phase="0"] .compiler-source,
.hero-object[data-hero-phase="1"] .compiler-root,
.hero-object[data-hero-phase="2"] .compiler-packet {
  opacity: 1;
  transform: translateY(-0.3rem) scale(1);
}

.hero-object[data-hero-phase="1"] .compiler-progress-one,
.hero-object[data-hero-phase="2"] .compiler-progress-one,
.hero-object[data-hero-phase="2"] .compiler-progress-two {
  transform: scaleX(1);
}

.compiler-readout {
  min-height: 4.8rem;
  padding: var(--space-sm) var(--space-md) var(--space-md);
  flex-direction: column;
  justify-content: flex-start;
  gap: var(--space-2xs);
}

.compiler-readout strong {
  font-family: var(--font-display);
  font-size: 1.15rem;
  letter-spacing: -0.02em;
}

.compiler-readout span {
  color: var(--ink-soft);
  font-size: var(--text-xs);
}

.compiler-controls {
  padding: 0 var(--space-md) var(--space-md);
  gap: 1px;
}

.compiler-controls button,
.compiler-replay {
  min-height: 2.75rem;
  border: 1px solid var(--rule);
  color: var(--ink-soft);
  background: transparent;
  cursor: pointer;
  transition:
    color var(--duration-fast) linear,
    background-color var(--duration-fast) linear,
    border-color var(--duration-fast) linear,
    transform var(--duration-fast) var(--ease-out);
}

.compiler-controls button {
  flex: 1;
  padding: 0.55rem 0.4rem;
  font-size: var(--text-xs);
  font-weight: 720;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.compiler-controls button span {
  color: var(--ink-faint);
}

.compiler-controls button:hover,
.compiler-controls button[aria-pressed="true"] {
  color: var(--paper-raised);
  border-color: var(--signal-dark);
  background: var(--signal-dark);
}

.compiler-controls button[aria-pressed="true"] span {
  color: var(--signal-pale);
}

.compiler-replay {
  min-height: 3rem;
  padding: 0 var(--space-md);
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-width: 1px 0 0;
  font-size: var(--text-xs);
  font-weight: 720;
}

.compiler-replay:hover {
  color: var(--ink);
  background: var(--paper-deep);
}

.compiler-replay:active {
  transform: translateY(1px);
}

.hero-proof {
  grid-area: proof;
  padding-top: var(--space-lg);
  display: grid;
  grid-template-columns: minmax(16rem, 1fr) auto auto auto;
  gap: var(--space-xl);
  align-items: end;
  border-top: 1px solid var(--ink);
}

.hero-proof > p {
  font-size: var(--text-sm);
  color: var(--ink-soft);
}

.hero-proof > p span {
  display: block;
  margin-bottom: var(--space-xs);
  color: var(--ink);
  font-weight: 740;
}

.proof-stat {
  display: grid;
  gap: var(--space-2xs);
}

.proof-stat strong {
  font-family: var(--font-display);
  font-size: 1.55rem;
  font-variant-numeric: tabular-nums;
}

.proof-stat span,
.hero-proof > a {
  font-size: var(--text-xs);
  color: var(--ink-soft);
}

.hero-proof > a {
  min-height: 2.75rem;
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  font-weight: 700;
  color: var(--signal-dark);
}

.definition,
.boundary,
.evidence,
.protocol,
.conformance {
  width: var(--page);
  margin: 0 auto;
  padding: var(--space-5xl) 0;
}

.definition {
  display: grid;
  grid-template-columns: minmax(13rem, 0.35fr) minmax(0, 1fr);
  grid-template-areas:
    "index title"
    ". body";
  gap: var(--space-2xl) clamp(2rem, 8vw, 9rem);
  border-top: 1px solid var(--ink);
}

.definition .section-index {
  grid-area: index;
}

.definition h2 {
  grid-area: title;
  font-size: var(--text-section);
  line-height: 0.94;
}

.definition-body {
  grid-area: body;
  display: grid;
  grid-template-columns: minmax(16rem, 0.8fr) minmax(16rem, 1.2fr);
  gap: var(--space-3xl);
  align-items: end;
}

.definition-body > p {
  max-width: 38rem;
  color: var(--ink-soft);
  font-size: var(--text-lead);
}

.equation {
  padding: var(--space-xl) 0;
  display: grid;
  grid-template-columns: auto auto 1fr;
  gap: var(--space-xl);
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 4vw, 3.2rem);
  letter-spacing: -0.04em;
}

.equation b {
  color: var(--signal);
}

.mechanism {
  padding: var(--space-5xl) 0;
  background: var(--ink);
  color: var(--paper);
}

.mechanism-intro,
.mechanism-layout {
  width: var(--page);
  margin: 0 auto;
}

.mechanism-intro {
  display: grid;
  grid-template-columns: 0.38fr 1fr 0.7fr;
  gap: clamp(2rem, 6vw, 7rem);
  align-items: end;
}

.mechanism .section-index::before {
  background: var(--signal);
}

.mechanism-intro h2 {
  font-size: var(--text-section);
  line-height: 0.94;
}

.mechanism-intro > p:last-child {
  color: oklch(78% 0.018 72);
  font-size: var(--text-lead);
}

.mechanism-layout {
  margin-top: var(--space-4xl);
  display: grid;
  grid-template-columns: minmax(20rem, 0.92fr) minmax(22rem, 1.08fr);
  gap: clamp(3rem, 8vw, 9rem);
  align-items: start;
}

.kinetic-frame {
  position: sticky;
  top: 7rem;
  border: 1px solid oklch(48% 0.025 52);
  background: oklch(24% 0.026 52);
}

.frame-head,
.frame-foot {
  min-height: 3.25rem;
  padding: 0 var(--space-md);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  font-size: var(--text-xs);
  font-weight: 680;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.frame-head {
  border-bottom: 1px solid oklch(48% 0.025 52);
}

.frame-foot {
  border-top: 1px solid oklch(48% 0.025 52);
}

.frame-status {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  color: oklch(79% 0.07 162);
}

.frame-status i,
.command-result i {
  width: 0.55rem;
  height: 0.55rem;
  border-radius: 50%;
  background: oklch(71% 0.12 162);
}

.kinetic-frame svg {
  display: block;
  width: 100%;
}

.frame-raw,
.frame-links,
.frame-nodes,
.frame-rings,
.frame-packet,
.frame-core {
  transform-origin: center;
  transition:
    transform 620ms var(--ease-out),
    opacity 460ms var(--ease-out);
}

.frame-raw {
  fill: none;
  stroke: oklch(72% 0.03 72);
  stroke-width: 3;
}

.frame-links {
  fill: none;
  stroke: var(--signal);
  stroke-width: 2;
}

.frame-nodes circle {
  fill: var(--paper);
  stroke: var(--signal);
  stroke-width: 3;
}

.frame-rings {
  fill: none;
  stroke: var(--signal);
  stroke-width: 3;
}

.frame-rings circle:nth-child(1) { stroke-dasharray: 42 8 16 5 9 20; }
.frame-rings circle:nth-child(2) { stroke-dasharray: 14 8 27 12; stroke: var(--paper); }
.frame-rings circle:nth-child(3) { stroke-dasharray: 3 5 21 10; }

.frame-packet {
  fill: oklch(27% 0.025 52);
  stroke: var(--paper);
  stroke-width: 2;
}

.frame-packet path {
  fill: none;
}

.frame-packet .packet-proof {
  stroke: oklch(71% 0.12 162);
  stroke-width: 5;
}

.frame-core {
  fill: var(--signal);
}

.kinetic-frame[data-stage="0"] .frame-links,
.kinetic-frame[data-stage="0"] .frame-nodes,
.kinetic-frame[data-stage="0"] .frame-rings,
.kinetic-frame[data-stage="0"] .frame-packet,
.kinetic-frame[data-stage="0"] .frame-core {
  opacity: 0;
  transform: scale(0.72);
}

.kinetic-frame[data-stage="1"] .frame-rings,
.kinetic-frame[data-stage="1"] .frame-packet,
.kinetic-frame[data-stage="1"] .frame-core {
  opacity: 0;
  transform: scale(0.72);
}

.kinetic-frame[data-stage="1"] .frame-raw {
  opacity: 0.18;
}

.kinetic-frame[data-stage="2"] .frame-raw,
.kinetic-frame[data-stage="2"] .frame-packet,
.kinetic-frame[data-stage="2"] .frame-core {
  opacity: 0;
  transform: scale(0.72);
}

.kinetic-frame[data-stage="2"] .frame-links,
.kinetic-frame[data-stage="2"] .frame-nodes {
  opacity: 0.28;
  transform: scale(0.88);
}

.kinetic-frame[data-stage="3"] .frame-raw,
.kinetic-frame[data-stage="3"] .frame-links,
.kinetic-frame[data-stage="3"] .frame-nodes,
.kinetic-frame[data-stage="3"] .frame-core {
  opacity: 0;
  transform: scale(0.72);
}

.kinetic-frame[data-stage="3"] .frame-rings {
  opacity: 0.22;
  transform: scale(0.92);
}

.story-steps {
  display: grid;
}

.story-step {
  min-height: 68vh;
  padding: var(--space-3xl) 0;
  display: grid;
  grid-template-columns: 3rem 1fr;
  gap: var(--space-xl);
  align-content: center;
  border-top: 1px solid oklch(42% 0.025 52);
  opacity: 1;
}

.story-step:last-child {
  border-bottom: 1px solid oklch(42% 0.025 52);
}

.story-step h3 {
  color: oklch(67% 0.018 72);
  transition: color var(--duration-state) linear;
}

.story-step.is-active h3 {
  color: var(--paper);
}

.story-step > span {
  color: oklch(76% 0.14 32);
  font-size: var(--text-xs);
  font-weight: 760;
}

.story-step h3 {
  font-size: clamp(2rem, 4vw, 4rem);
  line-height: 1;
}

.story-step p {
  max-width: 42rem;
  margin-top: var(--space-lg);
  color: oklch(78% 0.018 72);
  font-size: var(--text-lead);
}

.story-step code {
  width: fit-content;
  margin-top: var(--space-xl);
  padding: var(--space-xs) var(--space-sm);
  display: block;
  color: oklch(86% 0.07 32);
  background: oklch(30% 0.04 32);
  font-size: var(--text-xs);
}

.boundary {
  display: grid;
  grid-template-columns: 0.34fr 0.66fr;
  grid-template-areas:
    "index title"
    ". grid";
  gap: var(--space-3xl) clamp(2rem, 8vw, 9rem);
}

.boundary .section-index { grid-area: index; }
.boundary h2 { grid-area: title; font-size: var(--text-section); line-height: 0.92; }

.boundary-grid {
  grid-area: grid;
  display: grid;
  grid-template-columns: 1fr 1fr;
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
}

.boundary-grid article {
  position: relative;
  padding: var(--space-2xl) var(--space-2xl) var(--space-3xl) 0;
}

.boundary-grid article + article {
  padding-left: var(--space-2xl);
  border-left: 1px solid var(--ink);
}

.boundary-mark {
  position: absolute;
  top: var(--space-lg);
  right: var(--space-xl);
  color: var(--verified);
  font-family: var(--font-display);
  font-size: 2.4rem;
}

.boundary-mark-no {
  color: var(--signal);
}

.boundary-grid h3 {
  padding-right: 3rem;
  font-size: 1.6rem;
}

.boundary-grid ul {
  margin: var(--space-xl) 0 0;
  padding: 0;
  list-style: none;
}

.boundary-grid li {
  padding: var(--space-sm) 0;
  border-top: 1px solid var(--rule);
  color: var(--ink-soft);
}

.evidence {
  display: grid;
  grid-template-columns: minmax(18rem, 0.7fr) minmax(28rem, 1.3fr);
  grid-template-areas:
    "heading ledger"
    "note ledger";
  gap: var(--space-3xl) clamp(3rem, 8vw, 9rem);
  border-top: 1px solid var(--ink);
}

.evidence-heading { grid-area: heading; }
.evidence-heading h2,
.protocol-heading h2,
.conformance h2 {
  margin-top: var(--space-xl);
  font-size: clamp(2.8rem, 6vw, 5.8rem);
  line-height: 0.94;
}

.evidence-heading > p:last-child,
.protocol-heading > p:last-child,
.conformance > div:first-child > p:last-child {
  max-width: 40rem;
  margin-top: var(--space-xl);
  color: var(--ink-soft);
  font-size: var(--text-lead);
}

.evidence-ledger {
  grid-area: ledger;
  width: 100%;
  display: block;
  border-collapse: collapse;
  border-top: 2px solid var(--ink);
  overflow-x: auto;
}

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

.evidence-ledger thead,
.evidence-ledger tbody {
  display: contents;
}

.evidence-ledger th,
.evidence-ledger td {
  padding: 0;
  text-align: left;
  font: inherit;
}

.ledger-row {
  min-height: 5.5rem;
  display: grid;
  grid-template-columns: minmax(9rem, 1.1fr) repeat(5, minmax(6.5rem, 0.72fr));
  gap: var(--space-md);
  align-items: center;
  border-bottom: 1px solid var(--ink);
}

.ledger-row > * + * {
  padding-left: var(--space-lg);
  border-left: 1px solid var(--rule);
}

.ledger-head {
  min-height: 3.2rem;
  font-size: var(--text-xs);
  font-weight: 750;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.ledger-row strong {
  font-family: var(--font-display);
  font-size: clamp(1.2rem, 2vw, 1.75rem);
  font-variant-numeric: tabular-nums;
}

.ledger-row .result {
  color: var(--verified);
}

.scope-note {
  grid-area: note;
  padding-top: var(--space-xl);
  border-top: 1px solid var(--ink);
}

.scope-note > span {
  display: block;
  margin-bottom: var(--space-md);
  color: var(--signal-dark);
  font-size: var(--text-xs);
  font-weight: 760;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.scope-note p {
  color: var(--ink-soft);
}

.scope-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0 var(--space-xl);
}

.scope-links a {
  min-height: 3rem;
  margin-top: var(--space-lg);
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  color: var(--signal-dark);
  font-size: var(--text-sm);
  font-weight: 730;
}

.protocol {
  display: grid;
  grid-template-columns: minmax(18rem, 0.7fr) minmax(28rem, 1.3fr);
  gap: clamp(3rem, 8vw, 9rem);
}

.class-stack {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 2px solid var(--ink);
}

.class-stack li {
  min-height: 8.5rem;
  display: grid;
  grid-template-columns: 5rem 1fr auto;
  gap: var(--space-xl);
  align-items: center;
  border-bottom: 1px solid var(--ink);
}

.class-letter {
  font-family: var(--font-display);
  font-size: 4rem;
  line-height: 1;
  color: var(--signal);
}

.class-stack strong {
  font-family: var(--font-display);
  font-size: 1.45rem;
}

.class-stack p {
  margin-top: var(--space-xs);
  color: var(--ink-soft);
}

.class-stack code {
  font-size: var(--text-xs);
  color: var(--ink-soft);
}

.conformance {
  display: grid;
  grid-template-columns: 0.78fr 1.22fr;
  gap: clamp(3rem, 8vw, 9rem);
  align-items: end;
  border-top: 1px solid var(--ink);
}

.command-block {
  color: oklch(88% 0.015 72);
  background: var(--ink);
  border: 1px solid var(--ink);
}

.command-head,
.command-result {
  min-height: 3.3rem;
  padding: 0 var(--space-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  font-size: var(--text-xs);
  letter-spacing: 0.02em;
}

.command-head {
  border-bottom: 1px solid oklch(44% 0.025 52);
}

.copy-command {
  min-width: 7.5rem;
  min-height: 2.75rem;
  border: 0;
  color: oklch(86% 0.07 32);
  background: transparent;
  cursor: pointer;
  font-size: var(--text-xs);
  font-weight: 720;
}

.copy-command:hover {
  color: var(--paper-raised);
}

.copy-success {
  display: none;
  color: oklch(79% 0.1 162);
}

.copy-command.is-copied .copy-default { display: none; }
.copy-command.is-copied .copy-success { display: inline; }

.command-block pre {
  margin: 0;
  padding: clamp(2rem, 5vw, 4rem) var(--space-lg);
  overflow-x: auto;
  font-size: clamp(1rem, 2.4vw, 1.65rem);
}

.command-block pre span {
  color: var(--signal);
}

.command-result {
  justify-content: flex-start;
  border-top: 1px solid oklch(44% 0.025 52);
  color: oklch(79% 0.1 162);
}

.finale {
  position: relative;
  min-height: 92svh;
  padding: var(--space-5xl) max(4vw, calc((100vw - 86rem) / 2));
  display: grid;
  grid-template-columns: 0.7fr 1.3fr;
  gap: clamp(3rem, 8vw, 10rem);
  align-items: center;
  overflow: hidden;
  color: var(--paper);
  background: var(--signal-dark);
}

.finale::before {
  content: "SCGP";
  position: absolute;
  right: -0.04em;
  bottom: -0.22em;
  color: oklch(53% 0.16 32);
  font-family: var(--font-display);
  font-size: clamp(9rem, 30vw, 31rem);
  font-weight: 700;
  letter-spacing: -0.1em;
  line-height: 1;
  pointer-events: none;
}

.finale-glyph,
.finale-copy {
  position: relative;
  z-index: 1;
}

.finale-glyph svg {
  width: min(100%, 29rem);
  overflow: visible;
  fill: none;
  stroke: var(--paper);
  stroke-width: 2;
}

.finale-glyph svg circle:first-child {
  stroke-dasharray: 4 7 24 11;
  transform-origin: center;
}

.finale-glyph svg path {
  fill: oklch(69% 0.18 32 / 0.18);
  stroke-width: 4;
}

.finale-glyph svg circle:last-child {
  fill: var(--paper);
}

.finale .section-index::before {
  background: var(--paper);
}

.finale h2,
.finale h1 {
  margin-top: var(--space-xl);
  font-size: clamp(3.5rem, 8vw, 8rem);
  line-height: 0.88;
}

.not-found {
  min-height: 100svh;
}

.not-found-title {
  font-size: clamp(3.5rem, 8vw, 8rem);
  line-height: 0.88;
}

.finale-copy > p:not(.section-index) {
  max-width: 42rem;
  margin-top: var(--space-2xl);
  color: oklch(89% 0.045 32);
  font-size: var(--text-lead);
}

.button-inverse {
  color: var(--signal-dark);
  background: var(--paper-raised);
}

.button-inverse:hover {
  background: var(--signal-pale);
}

.button-outline {
  color: var(--paper);
  border-color: oklch(86% 0.05 32);
}

.button-outline:hover {
  color: var(--signal-dark);
  background: var(--paper);
}

footer {
  min-height: 7.5rem;
  padding: var(--space-xl) max(4vw, calc((100vw - 86rem) / 2));
  display: grid;
  grid-template-columns: 1fr auto auto;
  gap: var(--space-xl);
  align-items: center;
  color: oklch(76% 0.018 72);
  background: var(--ink);
  font-size: var(--text-xs);
}

.footer-wordmark {
  color: var(--paper);
}

footer a {
  color: var(--paper);
}

[data-reveal] {
  opacity: 0;
  transform: translateY(1.5rem);
}

.is-ready [data-reveal] {
  animation: reveal var(--duration-enter) var(--ease-out) forwards;
  animation-delay: var(--delay, 0ms);
}

@keyframes reveal {
  to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 64rem) {
  .site-header {
    grid-template-columns: 1fr auto;
  }

  .site-header nav {
    grid-column: 1 / -1;
    grid-row: 2;
    padding: var(--space-sm) 0;
    justify-content: center;
    border-top: 1px solid var(--rule);
  }

  .hero {
    min-height: auto;
    grid-template-columns: 1fr 0.62fr;
  }

  .hero-proof {
    grid-template-columns: 1fr auto auto;
  }

  .hero-proof > a {
    grid-column: 1 / -1;
  }

  .mechanism-intro {
    grid-template-columns: 0.35fr 1fr;
  }

  .mechanism-intro > p:last-child {
    grid-column: 2;
  }

  .mechanism-layout {
    grid-template-columns: 0.85fr 1.15fr;
    gap: var(--space-3xl);
  }

  .definition,
  .boundary {
    grid-template-columns: 0.25fr 0.75fr;
  }

  .definition-body {
    grid-template-columns: 1fr;
  }

  .evidence,
  .protocol,
  .conformance {
    grid-template-columns: 1fr;
  }

  .evidence {
    grid-template-areas:
      "heading"
      "ledger"
      "note";
  }

  .evidence-heading {
    display: grid;
    grid-template-columns: 0.45fr 1fr;
    gap: var(--space-xl);
  }

  .evidence-heading .section-index {
    grid-column: 1 / -1;
  }

  .finale {
    grid-template-columns: 0.5fr 1fr;
  }
}

@media (max-width: 46rem) {
  :root {
    --page: min(90vw, 40rem);
    --space-5xl: 6.5rem;
  }

  .site-header {
    min-height: 4.5rem;
  }

  .site-header nav {
    justify-content: space-between;
    gap: var(--space-md);
  }

  .hero {
    padding-top: var(--space-3xl);
    grid-template-columns: 1fr;
    grid-template-areas:
      "copy"
      "object"
      "proof";
    gap: var(--space-3xl);
  }

  .hero h1 {
    max-width: 9ch;
  }

  .hero-object {
    width: min(90vw, 27rem);
    min-height: 31rem;
    justify-self: start;
  }

  .hero-proof {
    grid-template-columns: 1fr 1fr;
  }

  .hero-proof > p,
  .hero-proof > a {
    grid-column: 1 / -1;
  }

  .definition,
  .boundary {
    display: grid;
    grid-template-columns: 1fr;
    grid-template-areas:
      "index"
      "title"
      "body";
    gap: var(--space-xl);
  }

  .boundary {
    grid-template-areas:
      "index"
      "title"
      "grid";
  }

  .mechanism-intro {
    grid-template-columns: 1fr;
  }

  .mechanism-intro > p:last-child {
    grid-column: auto;
  }

  .mechanism-layout {
    grid-template-columns: 1fr;
  }

  .kinetic-frame {
    position: relative;
    top: auto;
  }

  .story-step {
    min-height: auto;
    padding: var(--space-3xl) 0;
    opacity: 1;
  }

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

  .boundary-grid article + article {
    padding-left: 0;
    border-top: 1px solid var(--ink);
    border-left: 0;
  }

  .evidence-heading {
    display: block;
  }

  .ledger-row {
    min-height: auto;
    grid-template-columns: repeat(2, 1fr);
    padding: var(--space-md) 0;
  }

  .ledger-row > *:first-child {
    grid-column: 1 / -1;
    align-self: end;
  }

  .ledger-row > * + * {
    padding-left: 0;
    border-left: 0;
  }

  .ledger-row td {
    display: grid;
    gap: 0.25rem;
    padding-top: var(--space-sm);
  }

  .ledger-row td::before {
    content: attr(data-label);
    color: var(--ink-muted);
    font-size: 0.75rem;
    font-weight: 750;
    letter-spacing: 0.08em;
    text-transform: uppercase;
  }

  .ledger-row td:nth-of-type(even) {
    padding-left: var(--space-md);
    border-left: 1px solid var(--rule);
  }

  .ledger-head {
    display: none;
  }

  .class-stack li {
    grid-template-columns: 3.5rem 1fr;
    padding: var(--space-lg) 0;
  }

  .class-stack code {
    grid-column: 2;
  }

  .class-letter {
    font-size: 3rem;
  }

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

  .finale-glyph svg {
    width: min(68vw, 18rem);
  }

  footer {
    grid-template-columns: 1fr;
    align-content: center;
  }
}

@media (pointer: coarse) {
  .button,
  .site-header nav a,
  .header-source,
  .copy-command {
    min-height: 3rem;
  }
}

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

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

  [data-reveal] {
    opacity: 1;
    transform: none;
  }
}