:root {
  color-scheme: dark;
  --ink: #f3eee5;
  --ink-soft: #d4cec3;
  --muted: #979088;
  --dim: #706b65;
  --void: #050505;
  --ground: #09090a;
  --panel: #0e0e10;
  --panel-2: #141416;
  --panel-3: #19191c;
  --line: rgba(243, 238, 229, 0.13);
  --line-strong: rgba(243, 238, 229, 0.3);
  --violet: #a89cff;
  --violet-dim: rgba(168, 156, 255, 0.11);
  --violet-line: rgba(168, 156, 255, 0.38);
  --cyan: #86d8cf;
  --cyan-dim: rgba(134, 216, 207, 0.1);
  --cyan-line: rgba(134, 216, 207, 0.38);
  --amber: #ddb778;
  --amber-dim: rgba(221, 183, 120, 0.1);
  --amber-line: rgba(221, 183, 120, 0.38);
  --danger: #e58f7d;
  --danger-dim: rgba(229, 143, 125, 0.1);
  --success: #acd4b3;
  --success-dim: rgba(172, 212, 179, 0.1);
  --serif: "Songti SC", "STSong", "Noto Serif CJK SC", "Source Han Serif SC", Georgia, serif;
  --sans: Inter, "Helvetica Neue", Helvetica, Arial, "PingFang SC", sans-serif;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  --shell: 84rem;
  --reading: 48rem;
  --wide: 67rem;
  --gutter: clamp(1.15rem, 4vw, 4rem);
  --radius: 0.15rem;
}

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

html {
  min-width: 20rem;
  background: var(--void);
  scroll-behavior: smooth;
  scroll-padding-top: 2rem;
}

body {
  min-height: 100dvh;
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(68rem 46rem at 82% -8%, rgba(168, 156, 255, 0.105), transparent 67%),
    radial-gradient(54rem 42rem at -8% 35%, rgba(134, 216, 207, 0.05), transparent 71%),
    linear-gradient(rgba(243, 238, 229, 0.018) 1px, transparent 1px) 0 0 / 100% 11rem,
    var(--void);
  font-family: var(--serif);
  font-synthesis: none;
  line-height: 1.84;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

body::before {
  position: fixed;
  inset: 0;
  z-index: -1;
  content: "";
  pointer-events: none;
  opacity: 0.18;
  background-image:
    repeating-radial-gradient(circle at 18% 24%, rgba(255, 255, 255, 0.04) 0 1px, transparent 1px 8px),
    repeating-radial-gradient(circle at 79% 65%, rgba(255, 255, 255, 0.018) 0 1px, transparent 1px 10px);
  background-size: 139px 127px, 187px 163px;
  mix-blend-mode: soft-light;
}

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

a {
  color: inherit;
  text-decoration-color: var(--line-strong);
  text-underline-offset: 0.25em;
  transition: color 160ms ease, border-color 160ms ease, background-color 160ms ease;
}

a:hover {
  color: var(--cyan);
}

button,
input {
  font: inherit;
}

button {
  color: inherit;
}

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

:focus-visible {
  outline: 2px solid var(--ink);
  outline-offset: 4px;
}

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

code {
  color: var(--cyan);
  font-size: 0.87em;
}

sup {
  font-family: var(--sans);
  font-size: 0.65em;
}

sup a {
  color: var(--violet);
  text-decoration: none;
}

h1,
h2,
h3,
p,
li,
dd {
  text-wrap: pretty;
}

h1,
h2,
h3 {
  font-weight: 400;
}

.skip-link {
  position: fixed;
  top: 0.8rem;
  left: 0.8rem;
  z-index: 100;
  padding: 0.65rem 0.85rem;
  color: var(--void);
  background: var(--ink);
  font-family: var(--sans);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-decoration: none;
  transform: translateY(-180%);
  transition: transform 160ms ease;
}

.skip-link:focus {
  transform: none;
}

.reading-progress {
  position: fixed;
  inset: 0 0 auto;
  z-index: 90;
  height: 2px;
  background: rgba(243, 238, 229, 0.04);
  pointer-events: none;
}

.reading-progress span {
  display: block;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, var(--ink), var(--violet), var(--cyan));
  transform: scaleX(0);
  transform-origin: left;
  will-change: transform;
}

.site-header,
.page,
.site-footer {
  width: min(calc(100% - var(--gutter) * 2), var(--shell));
  margin-inline: auto;
}

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

.masthead {
  min-height: 5.2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
}

.brand {
  font-family: var(--sans);
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.36em;
  text-decoration: none;
}

.course-mark {
  margin: 0;
  color: var(--muted);
  font-family: var(--sans);
  font-size: 0.67rem;
  letter-spacing: 0.16em;
  line-height: 1.6;
  text-align: right;
  text-transform: uppercase;
}

.course-mark strong {
  color: var(--ink);
  font-weight: 500;
}

.hero {
  position: relative;
  min-height: min(57rem, calc(100dvh - 5rem));
  display: grid;
  grid-template-columns: minmax(0, 1.03fr) minmax(22rem, 0.86fr);
  gap: clamp(3rem, 7vw, 7rem);
  align-items: center;
  padding: clamp(5rem, 10vw, 8.5rem) 0 clamp(4rem, 8vw, 6.5rem);
  border-bottom: 1px solid var(--line-strong);
  isolation: isolate;
  overflow: hidden;
}

.hero::after {
  position: absolute;
  right: -0.04em;
  bottom: -0.28em;
  z-index: -1;
  color: rgba(243, 238, 229, 0.027);
  content: "22.01";
  font-family: var(--mono);
  font-size: clamp(9rem, 23vw, 22rem);
  letter-spacing: -0.09em;
  line-height: 1;
  pointer-events: none;
  user-select: none;
}

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

.eyebrow,
.chapter-number,
.lab-kicker,
.toc-title,
.mini-label {
  color: var(--muted);
  font-family: var(--sans);
  font-size: 0.67rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  line-height: 1.55;
  text-transform: uppercase;
}

.eyebrow {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin: 0 0 1.8rem;
}

.eyebrow::before {
  width: 2.75rem;
  height: 1px;
  background: var(--line-strong);
  content: "";
}

.hero h1 {
  max-width: 10.5ch;
  margin: 0;
  font-size: clamp(3.25rem, 7.15vw, 6.85rem);
  letter-spacing: 0.015em;
  line-height: 1.02;
}

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

.hero-deck {
  max-width: 43rem;
  margin: 2.5rem 0 0;
  color: var(--ink-soft);
  font-size: clamp(1rem, 1.7vw, 1.22rem);
  line-height: 1.9;
}

.hero-deck strong {
  color: var(--ink);
  font-weight: 600;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem 1.25rem;
  margin: 2.4rem 0 0;
  padding: 1rem 0 0;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-family: var(--sans);
  font-size: 0.67rem;
  letter-spacing: 0.1em;
  list-style: none;
  text-transform: uppercase;
}

.hero-meta li {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.hero-meta li:not(:last-child)::after {
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: var(--line-strong);
  content: "";
}

.hero-visual {
  min-width: 0;
}

.hero-stack {
  position: relative;
  padding: 0.9rem;
  border: 1px solid var(--line-strong);
  background:
    linear-gradient(rgba(243, 238, 229, 0.026) 1px, transparent 1px) 0 0 / 100% 4rem,
    rgba(9, 9, 10, 0.78);
  box-shadow: 0 2rem 7rem rgba(0, 0, 0, 0.38);
  backdrop-filter: blur(8px);
}

.stack-console {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 0.75rem;
  padding: 0.1rem 0.1rem 0.7rem;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.62rem;
  letter-spacing: 0.1em;
}

.trace-status {
  color: var(--success);
}

.hero-layer {
  min-height: 5rem;
  display: grid;
  grid-template-columns: 2.2rem 1fr auto;
  align-items: center;
  gap: 0.85rem;
  padding: 0.9rem 1rem;
  border: 1px solid var(--line);
  background: var(--panel);
}

.hero-layer .layer-index,
.hero-layer i,
.hero-layer b,
.hero-layer small {
  font-family: var(--sans);
}

.layer-index {
  color: var(--dim);
  font-family: var(--mono) !important;
  font-size: 0.65rem;
}

.hero-layer b {
  display: block;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.13em;
}

.hero-layer small {
  display: block;
  margin-top: 0.15rem;
  color: var(--muted);
  font-size: 0.72rem;
}

.hero-layer i {
  min-width: 3.1rem;
  padding: 0.25rem 0.4rem;
  border: 1px solid var(--line);
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.58rem;
  font-style: normal;
  letter-spacing: 0.08em;
  text-align: center;
}

.layer-ui {
  border-color: var(--violet-line);
  background: linear-gradient(90deg, var(--violet-dim), transparent 80%), var(--panel);
}

.layer-ui i,
.layer-library i {
  color: var(--violet);
  border-color: var(--violet-line);
}

.layer-network {
  border-color: var(--amber-line);
  background: linear-gradient(90deg, var(--amber-dim), transparent 80%), var(--panel);
}

.layer-network i {
  color: var(--amber);
  border-color: var(--amber-line);
}

.layer-contract {
  border-color: var(--cyan-line);
  background: linear-gradient(90deg, var(--cyan-dim), transparent 80%), var(--panel);
}

.layer-contract i {
  color: var(--cyan);
  border-color: var(--cyan-line);
}

.hero-connector {
  position: relative;
  height: 2.2rem;
  display: grid;
  place-items: center;
  color: var(--dim);
  font-family: var(--mono);
  font-size: 0.54rem;
  letter-spacing: 0.08em;
}

.hero-connector::before {
  position: absolute;
  inset: 0 auto;
  width: 1px;
  content: "";
  background: linear-gradient(var(--line), var(--line-strong), var(--line));
}

.hero-connector span {
  z-index: 1;
  padding: 0.1rem 0.55rem;
  background: var(--ground);
}

.thesis {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-bottom: 1px solid var(--line-strong);
}

.thesis-item {
  min-height: 12rem;
  padding: clamp(1.7rem, 3vw, 2.5rem);
}

.thesis-item + .thesis-item {
  border-left: 1px solid var(--line);
}

.thesis-item span {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.62rem;
  letter-spacing: 0.09em;
}

.thesis-item p {
  margin: 2.4rem 0 0;
  color: var(--ink-soft);
  font-size: 1rem;
  line-height: 1.76;
}

.thesis-item strong {
  color: var(--ink);
  font-weight: 600;
}

.lesson-safety {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1.5rem;
  align-items: baseline;
  margin-block: 2rem;
  padding: 1.1rem 1.25rem;
  border: 1px solid var(--line);
  background: var(--panel);
}

.lesson-safety strong {
  color: var(--success);
  font-family: var(--sans);
  font-size: 0.66rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.lesson-safety p {
  margin: 0;
  color: var(--muted);
  font-size: 0.88rem;
}

.content-grid {
  display: grid;
  grid-template-columns: 13rem minmax(0, 1fr);
  gap: clamp(3rem, 7vw, 7rem);
  align-items: start;
  padding-block: clamp(4rem, 8vw, 7rem);
}

.sidebar {
  position: sticky;
  top: 2rem;
}

.toc {
  max-height: calc(100dvh - 4rem);
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--line-strong) transparent;
}

.toc-title {
  margin: 0 0 1rem;
}

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

.toc li {
  border-bottom: 1px solid var(--line);
}

.toc a {
  position: relative;
  display: grid;
  grid-template-columns: 1.8rem 1fr;
  gap: 0.55rem;
  padding: 0.78rem 0.2rem;
  color: var(--muted);
  font-family: var(--sans);
  font-size: 0.69rem;
  line-height: 1.45;
  text-decoration: none;
}

.toc a::before {
  content: attr(data-number);
  color: var(--dim);
  font-family: var(--mono);
  font-size: 0.58rem;
}

.toc a::after {
  position: absolute;
  top: 0;
  bottom: 0;
  left: -0.8rem;
  width: 1px;
  content: "";
  background: transparent;
}

.toc a:hover,
.toc a[aria-current="true"] {
  color: var(--ink);
}

.toc a[aria-current="true"]::after {
  background: var(--violet);
}

.lesson {
  min-width: 0;
}

.chapter {
  width: min(100%, var(--reading));
  margin-bottom: clamp(6rem, 11vw, 10rem);
}

.wide-chapter {
  width: min(100%, var(--wide));
}

.chapter-header {
  margin-bottom: 2.4rem;
}

.chapter-number {
  margin: 0 0 1rem;
}

.chapter h2 {
  max-width: 16ch;
  margin: 0;
  font-size: clamp(2.15rem, 5vw, 4.55rem);
  letter-spacing: 0.015em;
  line-height: 1.13;
}

.chapter h3 {
  margin: 3.5rem 0 1rem;
  font-size: clamp(1.42rem, 2.4vw, 2rem);
  line-height: 1.35;
}

.section-deck {
  max-width: 42rem;
  margin: 1.4rem 0 0;
  color: var(--muted);
  font-size: 1rem;
}

.chapter > p,
.chapter > .lead {
  max-width: var(--reading);
  color: var(--ink-soft);
  font-size: 1.06rem;
  line-height: 1.95;
}

.lead {
  margin: 0 0 2.8rem;
  color: var(--ink) !important;
  font-size: clamp(1.12rem, 1.8vw, 1.3rem) !important;
}

.lead strong {
  color: var(--violet);
  font-weight: 600;
}

.diagram {
  margin-block: 2.5rem;
}

.full-map {
  border: 1px solid var(--line-strong);
  background: var(--ground);
}

.map-row {
  min-height: 8rem;
  display: grid;
  grid-template-columns: 7.5rem repeat(3, 1fr);
  gap: 1px;
  background: var(--line);
}

.map-row > * {
  background: var(--panel);
}

.map-row.map-human {
  grid-template-columns: 7.5rem 1fr;
}

.map-tag {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  color: var(--dim);
  font-family: var(--mono);
  font-size: 0.62rem;
  letter-spacing: 0.1em;
  writing-mode: vertical-rl;
  transform: rotate(180deg);
}

.map-node {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 1.25rem 1.4rem;
}

.map-node b,
.map-node small {
  font-family: var(--sans);
}

.map-node b {
  font-size: 0.85rem;
  font-weight: 600;
}

.map-node small {
  margin-top: 0.55rem;
  color: var(--muted);
  font-size: 0.72rem;
  line-height: 1.55;
}

.map-node.accent-violet {
  box-shadow: inset 3px 0 var(--violet);
}

.map-node.accent-amber {
  box-shadow: inset 3px 0 var(--amber);
}

.map-node.accent-cyan {
  box-shadow: inset 3px 0 var(--cyan);
}

.map-arrow {
  position: relative;
  min-height: 2.5rem;
  display: grid;
  place-items: center;
  color: var(--dim);
  font-family: var(--mono);
  font-size: 0.57rem;
  letter-spacing: 0.08em;
}

.map-arrow::before {
  position: absolute;
  inset: 0 auto;
  width: 1px;
  content: "";
  background: var(--line-strong);
}

.map-arrow::after {
  position: absolute;
  bottom: -1px;
  width: 0;
  height: 0;
  border-top: 5px solid var(--line-strong);
  border-right: 4px solid transparent;
  border-left: 4px solid transparent;
  content: "";
}

.map-arrow.bidirectional::after {
  box-shadow: 0 -2.1rem 0 -1px var(--ground);
}

.map-arrow span {
  z-index: 1;
  padding: 0.05rem 0.6rem;
  background: var(--void);
}

.concept-grid {
  display: grid;
  gap: 1px;
  margin-block: 2.5rem;
  border: 1px solid var(--line);
  background: var(--line);
}

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

.concept-card {
  min-height: 15rem;
  padding: 1.5rem;
  background: var(--panel);
}

.concept-card > span {
  color: var(--muted);
  font-family: var(--sans);
  font-size: 0.65rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.concept-card h3 {
  margin: 3.8rem 0 0.7rem;
  font-size: 1.35rem;
}

.concept-card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.91rem;
}

.protocol-note,
.warning-note,
.status-note,
.deep-dive {
  max-width: var(--reading);
  margin-block: 2.5rem;
  padding: 1.3rem 1.45rem;
  border-left: 2px solid var(--violet);
  background: linear-gradient(90deg, var(--violet-dim), transparent 90%), var(--panel);
}

.warning-note {
  border-left-color: var(--danger);
  background: linear-gradient(90deg, var(--danger-dim), transparent 90%), var(--panel);
}

.status-note {
  border-left-color: var(--amber);
  background: linear-gradient(90deg, var(--amber-dim), transparent 90%), var(--panel);
}

.deep-dive {
  border-left-color: var(--cyan);
  background: linear-gradient(90deg, var(--cyan-dim), transparent 90%), var(--panel);
}

.protocol-note strong,
.warning-note strong,
.status-note strong,
.deep-dive strong {
  color: var(--ink);
  font-family: var(--sans);
  font-size: 0.68rem;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

.protocol-note p,
.warning-note p,
.status-note p,
.deep-dive p {
  margin: 0.7rem 0 0;
  color: var(--ink-soft);
  font-size: 0.94rem;
}

.lab {
  margin-block: 3rem;
  border: 1px solid var(--line-strong);
  background: var(--ground);
  box-shadow: 0 2rem 7rem rgba(0, 0, 0, 0.2);
}

.lab-head {
  min-height: 7.5rem;
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 2rem;
  padding: 1.5rem;
  border-bottom: 1px solid var(--line);
}

.lab-kicker {
  margin: 0 0 0.7rem;
}

.lab-head h3 {
  margin: 0;
  font-size: clamp(1.45rem, 3vw, 2.2rem);
}

.lab-head output {
  color: var(--cyan);
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  white-space: nowrap;
}

.layer-lab-layout {
  display: grid;
  grid-template-columns: minmax(13rem, 0.72fr) 1.65fr;
}

.layer-controls {
  display: grid;
  gap: 1px;
  padding: 1px;
  background: var(--line);
}

.layer-controls button {
  min-height: 6rem;
  display: grid;
  grid-template-columns: 2rem 1fr;
  grid-template-rows: auto auto;
  gap: 0.1rem 0.7rem;
  align-content: center;
  padding: 1rem;
  border: 0;
  background: var(--panel);
  text-align: left;
  cursor: pointer;
  transition: background-color 180ms ease, box-shadow 180ms ease;
}

.layer-controls button span {
  grid-row: 1 / 3;
  color: var(--dim);
  font-family: var(--mono);
  font-size: 0.63rem;
}

.layer-controls button b,
.layer-controls button small {
  font-family: var(--sans);
}

.layer-controls button b {
  font-size: 0.78rem;
  font-weight: 600;
}

.layer-controls button small {
  color: var(--muted);
  font-size: 0.7rem;
}

.layer-controls button:hover,
.layer-controls button[aria-pressed="true"] {
  background: var(--panel-2);
  box-shadow: inset 3px 0 var(--violet);
}

.layer-result {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  padding: 1px;
  background: var(--line);
}

.layer-result > div {
  min-height: 9rem;
  padding: 1.35rem;
  background: var(--panel);
}

.layer-result span,
.calldata-grid span,
.journey-result span,
.failure-result span {
  display: block;
  margin-bottom: 1rem;
  color: var(--muted);
  font-family: var(--sans);
  font-size: 0.62rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.layer-result strong,
.calldata-grid strong,
.journey-result strong,
.failure-result strong {
  color: var(--ink-soft);
  font-size: 0.96rem;
  font-weight: 400;
  line-height: 1.72;
}

.static-note {
  margin: 0;
  padding: 1rem 1.5rem;
  border-top: 1px solid var(--line);
  color: var(--dim);
  font-size: 0.8rem;
}

.definition-stack {
  margin-block: 2.5rem;
  border-top: 1px solid var(--line-strong);
}

.definition-stack > div {
  display: grid;
  grid-template-columns: 11rem 1fr;
  gap: 2rem;
  padding: 1.4rem 0;
  border-bottom: 1px solid var(--line);
}

.definition-stack dt {
  color: var(--ink);
  font-size: 1.05rem;
}

.definition-stack dd {
  margin: 0;
  color: var(--muted);
  font-size: 0.93rem;
}

.contract-boundary {
  display: grid;
  grid-template-columns: 1fr minmax(13rem, 0.74fr) 1fr;
  border: 1px solid var(--line-strong);
  background: var(--line);
  gap: 1px;
}

.boundary-side,
.boundary-core {
  background: var(--panel);
}

.boundary-side {
  padding: 1.4rem;
}

.boundary-label {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.61rem;
  letter-spacing: 0.08em;
}

.boundary-side ul {
  display: grid;
  gap: 1px;
  margin: 1.2rem 0 0;
  padding: 0;
  background: var(--line);
  list-style: none;
}

.boundary-side li {
  min-height: 5rem;
  padding: 0.9rem;
  background: var(--ground);
}

.boundary-side b,
.boundary-side small {
  display: block;
  font-family: var(--sans);
}

.boundary-side b {
  color: var(--cyan);
  font-size: 0.75rem;
}

.boundary-side.denied b {
  color: var(--danger);
}

.boundary-side small {
  margin-top: 0.25rem;
  color: var(--muted);
  font-size: 0.7rem;
}

.boundary-core {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 2rem 1.2rem;
  text-align: center;
  background:
    linear-gradient(var(--violet-dim), var(--cyan-dim)),
    var(--panel);
}

.boundary-core span,
.boundary-core small {
  font-family: var(--sans);
}

.boundary-core span {
  color: var(--violet);
  font-family: var(--mono);
  font-size: 0.62rem;
  letter-spacing: 0.11em;
}

.boundary-core b {
  margin-top: 1.1rem;
  font-size: 1.2rem;
  line-height: 1.5;
}

.boundary-core i {
  margin: 0.8rem 0 0;
  color: var(--cyan);
  font-family: var(--mono);
  font-style: normal;
}

.boundary-core small {
  margin-top: 1.3rem;
  color: var(--muted);
  font-size: 0.68rem;
  line-height: 1.6;
}

.split-explainer {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  margin-block: 2.5rem;
  border: 1px solid var(--line);
  background: var(--line);
}

.split-explainer article {
  min-height: 13rem;
  padding: 1.5rem;
  background: var(--panel);
}

.split-explainer h3 {
  margin: 3rem 0 0.7rem;
  font-size: 1.45rem;
}

.split-explainer p {
  margin: 0;
  color: var(--muted);
  font-size: 0.93rem;
}

.address-abi-equation {
  display: grid;
  grid-template-columns: 1fr auto 0.8fr auto 0.9fr auto 1.1fr;
  align-items: stretch;
  border: 1px solid var(--line-strong);
  background: var(--panel);
}

.address-abi-equation > i {
  display: grid;
  place-items: center;
  min-width: 2rem;
  color: var(--dim);
  font-family: var(--mono);
  font-size: 1.1rem;
  font-style: normal;
}

.equation-piece {
  min-height: 9rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 1.15rem;
  border-right: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.equation-piece span,
.equation-piece small {
  font-family: var(--sans);
}

.equation-piece span {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.59rem;
  letter-spacing: 0.08em;
}

.equation-piece b {
  margin-top: 1.2rem;
  font-size: 1.12rem;
}

.equation-piece small {
  margin-top: 0.25rem;
  color: var(--muted);
  font-size: 0.69rem;
}

.equation-piece.result {
  border-color: var(--cyan-line);
  background: var(--cyan-dim);
}

.button-row,
.failure-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  padding: 1.2rem 1.5rem;
  border-bottom: 1px solid var(--line);
}

.button-row button,
.failure-tabs button {
  min-height: 2.5rem;
  padding: 0.55rem 0.8rem;
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--muted);
  font-family: var(--sans);
  font-size: 0.7rem;
  cursor: pointer;
  transition: color 160ms ease, border-color 160ms ease, background-color 160ms ease;
}

.button-row button:hover,
.button-row button[aria-pressed="true"],
.button-row button[aria-selected="true"],
.failure-tabs button:hover,
.failure-tabs button[aria-selected="true"] {
  border-color: var(--violet-line);
  color: var(--ink);
  background: var(--violet-dim);
}

.calldata-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  padding: 1px;
  background: var(--line);
}

.calldata-grid > div {
  min-height: 8.5rem;
  padding: 1.2rem;
  background: var(--panel);
}

.rpc-sample {
  margin: 0;
  padding: 1.4rem 1.5rem;
  overflow-x: auto;
  border-top: 1px solid var(--line);
  background: #08090a;
  color: var(--cyan);
  font-size: 0.8rem;
  line-height: 1.7;
  white-space: pre;
}

.provider-triad {
  display: grid;
  grid-template-columns: 1fr 4rem 1fr 4rem 1fr;
  align-items: stretch;
}

.provider-triad article {
  min-height: 24rem;
  padding: 1.4rem;
  border: 1px solid var(--line-strong);
  background: var(--panel);
}

.provider-triad article:nth-of-type(1) {
  border-top-color: var(--violet);
}

.provider-triad article:nth-of-type(2) {
  border-top-color: var(--cyan);
}

.provider-triad article:nth-of-type(3) {
  border-top-color: var(--amber);
}

.provider-triad article > span {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.61rem;
  letter-spacing: 0.09em;
}

.provider-triad h3 {
  min-height: 4.8rem;
  margin: 2.5rem 0 1.2rem;
  font-size: 1.4rem;
}

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

.provider-triad li {
  padding: 0.65rem 0;
  border-bottom: 1px solid var(--line);
  color: var(--ink-soft);
  font-size: 0.83rem;
}

.provider-triad article > small {
  display: block;
  margin-top: 1.25rem;
  color: var(--muted);
  font-size: 0.74rem;
}

.triad-link {
  position: relative;
  display: grid;
  place-items: center;
  color: var(--dim);
  font-family: var(--mono);
  font-size: 0.56rem;
}

.triad-link::before {
  position: absolute;
  right: 0;
  left: 0;
  height: 1px;
  content: "";
  background: var(--line-strong);
}

.triad-link::after {
  position: absolute;
  right: 0;
  width: 0;
  height: 0;
  border-top: 4px solid transparent;
  border-bottom: 4px solid transparent;
  border-left: 6px solid var(--line-strong);
  content: "";
}

.triad-link span {
  z-index: 1;
  padding: 0.1rem 0.3rem;
  background: var(--void);
}

.event-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  margin-block: 2rem;
  border: 1px solid var(--line);
  background: var(--line);
}

.event-strip > div {
  min-height: 7.5rem;
  padding: 1.1rem;
  background: var(--panel);
}

.event-strip span,
.event-strip small {
  display: block;
  font-family: var(--sans);
}

.event-strip span {
  color: var(--cyan);
  font-family: var(--mono);
  font-size: 0.69rem;
}

.event-strip small {
  margin-top: 1.3rem;
  color: var(--muted);
  font-size: 0.7rem;
  line-height: 1.55;
}

.library-compare {
  max-width: 100%;
  overflow-x: auto;
  border: 1px solid var(--line-strong);
}

table {
  width: 100%;
  border-collapse: collapse;
  color: var(--ink-soft);
  font-size: 0.82rem;
}

th,
td {
  min-width: 9.5rem;
  padding: 1rem;
  border: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

thead th {
  color: var(--muted);
  background: var(--panel-2);
  font-family: var(--sans);
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

tbody th {
  color: var(--ink);
  background: var(--panel);
  font-weight: 400;
}

td {
  background: var(--ground);
}

.path-diagram {
  display: grid;
  grid-template-columns: 1fr 4.7rem 1fr 4.7rem 1.2fr 4.7rem 1fr;
  align-items: stretch;
}

.path-node {
  min-height: 12rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 1.2rem;
  border: 1px solid var(--line-strong);
  background: var(--panel);
}

.path-node.active {
  border-color: var(--cyan-line);
  background: var(--cyan-dim);
}

.path-node span,
.path-node small {
  font-family: var(--sans);
}

.path-node span {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.59rem;
  letter-spacing: 0.08em;
}

.path-node b {
  margin-top: 2rem;
  font-size: 1.05rem;
}

.path-node small {
  margin-top: 0.5rem;
  color: var(--muted);
  font-size: 0.68rem;
}

.path-link {
  position: relative;
  display: grid;
  place-items: center;
  color: var(--dim);
  font-family: var(--mono);
  font-size: 0.55rem;
  text-align: center;
}

.path-link::before {
  position: absolute;
  right: 0;
  left: 0;
  height: 1px;
  content: "";
  background: var(--cyan-line);
}

.path-link::after {
  position: absolute;
  right: 0;
  width: 0;
  height: 0;
  border-top: 4px solid transparent;
  border-bottom: 4px solid transparent;
  border-left: 6px solid var(--cyan);
  content: "";
}

.path-link.reverse::after {
  right: auto;
  left: 0;
  border-right: 6px solid var(--cyan);
  border-left: 0;
}

.path-link span {
  z-index: 1;
  max-width: 4.5rem;
  padding: 0.2rem;
  background: var(--void);
}

.truth-grid,
.data-channel-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  margin-block: 2.5rem;
  border: 1px solid var(--line);
  background: var(--line);
}

.truth-grid article,
.data-channel-grid article {
  min-height: 15rem;
  padding: 1.4rem;
  background: var(--panel);
}

.truth-grid article > span,
.data-channel-grid article > span {
  color: var(--cyan);
  font-family: var(--mono);
  font-size: 0.62rem;
  letter-spacing: 0.1em;
}

.truth-grid h3,
.data-channel-grid h3 {
  margin: 3.5rem 0 0.7rem;
  font-size: 1.3rem;
}

.truth-grid p,
.data-channel-grid p {
  margin: 0;
  color: var(--muted);
  font-size: 0.88rem;
}

.journey-track {
  display: grid;
  gap: 1px;
  margin: 0;
  padding: 1px;
  background: var(--line);
  list-style: none;
}

.journey-track li {
  min-height: 4.7rem;
  display: grid;
  grid-template-columns: 2.6rem 1fr auto;
  gap: 1rem;
  align-items: center;
  padding: 0.8rem 1.2rem;
  background: var(--panel);
}

.journey-track li > span,
.journey-track li > i {
  color: var(--dim);
  font-family: var(--mono);
  font-size: 0.62rem;
  font-style: normal;
}

.journey-track li > i {
  min-width: 3.6rem;
  padding: 0.2rem 0.35rem;
  border: 1px solid var(--line);
  color: var(--cyan);
  text-align: center;
}

.journey-track b,
.journey-track small {
  display: block;
  font-family: var(--sans);
}

.journey-track b {
  font-size: 0.78rem;
}

.journey-track small {
  margin-top: 0.1rem;
  color: var(--muted);
  font-size: 0.68rem;
}

.journey-result,
.failure-result {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  padding: 1px;
  background: var(--line);
}

.journey-result > div,
.failure-result > div {
  min-height: 8.5rem;
  padding: 1.15rem;
  background: var(--panel-2);
}

.write-pipeline {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 1px;
  border: 1px solid var(--line);
  background: var(--line);
}

.write-pipeline article {
  position: relative;
  min-height: 17rem;
  padding: 1.3rem;
  background: var(--panel);
}

.write-pipeline article::after {
  position: absolute;
  top: 2.2rem;
  right: -0.45rem;
  z-index: 1;
  color: var(--amber);
  content: "→";
  font-family: var(--mono);
}

.write-pipeline article:last-child::after {
  display: none;
}

.write-pipeline span,
.write-pipeline small {
  font-family: var(--sans);
}

.write-pipeline span {
  color: var(--amber);
  font-family: var(--mono);
  font-size: 0.59rem;
}

.write-pipeline b {
  display: block;
  margin-top: 4.5rem;
  font-size: 1.13rem;
  line-height: 1.45;
}

.write-pipeline small {
  display: block;
  margin-top: 0.7rem;
  color: var(--muted);
  font-size: 0.7rem;
  line-height: 1.6;
}

.success-ladder {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  align-items: end;
  gap: 1px;
  margin-block: 2rem;
  border-bottom: 1px solid var(--line-strong);
}

.success-ladder > div {
  min-height: calc(8rem + var(--rise, 0rem));
  padding: 1.15rem;
  border: 1px solid var(--line);
  border-bottom: 0;
  background: var(--panel);
}

.success-ladder > div:nth-child(2) {
  --rise: 1.5rem;
}

.success-ladder > div:nth-child(3) {
  --rise: 3rem;
}

.success-ladder > div:nth-child(4) {
  --rise: 4.5rem;
  border-color: var(--amber-line);
  background: var(--amber-dim);
}

.success-ladder > div:nth-child(5) {
  --rise: 6rem;
  border-color: var(--cyan-line);
  background: var(--cyan-dim);
}

.success-ladder span,
.success-ladder small {
  display: block;
  font-family: var(--sans);
}

.success-ladder span {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.57rem;
}

.success-ladder b {
  display: block;
  margin-top: 1.5rem;
  font-size: 1rem;
}

.success-ladder small {
  margin-top: 0.35rem;
  color: var(--muted);
  font-size: 0.66rem;
}

.event-loop {
  display: grid;
  grid-template-columns: 1fr 2.4rem 1fr 2.4rem 1fr 2.4rem 1fr 2.4rem 1fr;
  align-items: center;
}

.loop-node {
  min-height: 10.5rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 1rem;
  border: 1px solid var(--line-strong);
  background: var(--panel);
}

.loop-node.active {
  border-color: var(--cyan-line);
  background: var(--cyan-dim);
}

.loop-node span,
.loop-node small {
  font-family: var(--sans);
}

.loop-node span {
  color: var(--cyan);
  font-family: var(--mono);
  font-size: 0.58rem;
}

.loop-node b {
  margin-top: 1.4rem;
  font-size: 1rem;
}

.loop-node small {
  margin-top: 0.4rem;
  color: var(--muted);
  font-size: 0.66rem;
}

.loop-arrow {
  color: var(--dim);
  font-family: var(--mono);
  text-align: center;
}

.myth-fact {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  margin-block: 2rem;
  border: 1px solid var(--line);
  background: var(--line);
}

.myth-fact > div {
  padding: 1.35rem;
  background: var(--panel);
}

.myth-fact span {
  color: var(--danger);
  font-family: var(--sans);
  font-size: 0.64rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.myth-fact > div:last-child span {
  color: var(--cyan);
}

.myth-fact p {
  margin: 1.3rem 0 0;
  color: var(--ink-soft);
}

.production-map {
  border: 1px solid var(--line-strong);
  background: var(--ground);
}

.core-lane,
.support-lane {
  padding: 1.4rem;
}

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

.lane-label {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.62rem;
  letter-spacing: 0.1em;
}

.lane-items {
  display: grid;
  grid-template-columns: 1fr auto 0.9fr auto 1fr auto 1fr auto 1fr;
  align-items: center;
  margin-top: 1rem;
}

.lane-items > div {
  min-height: 8rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 0.9rem;
  border: 1px solid var(--cyan-line);
  background: var(--cyan-dim);
}

.lane-items > i {
  min-width: 2rem;
  color: var(--cyan);
  font-family: var(--mono);
  font-style: normal;
  text-align: center;
}

.lane-items b,
.lane-items small,
.support-grid b,
.support-grid small {
  display: block;
  font-family: var(--sans);
}

.lane-items b,
.support-grid b {
  font-size: 0.76rem;
}

.lane-items small,
.support-grid small {
  margin-top: 0.35rem;
  color: var(--muted);
  font-size: 0.65rem;
}

.support-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  margin-top: 1rem;
  background: var(--line);
}

.support-grid > div {
  min-height: 6.7rem;
  padding: 1rem;
  background: var(--panel);
}

.failure-tabs {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
}

.failure-tabs button {
  min-width: 0;
}

.failure-result > div {
  min-height: 11rem;
}

.trust-matrix {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  margin-block: 2.5rem;
  border: 1px solid var(--line);
  background: var(--line);
}

.trust-matrix article {
  min-height: 10rem;
  display: grid;
  grid-template-columns: 2.5rem 1fr;
  gap: 1rem;
  padding: 1.3rem;
  background: var(--panel);
}

.trust-matrix article > span {
  color: var(--dim);
  font-family: var(--mono);
  font-size: 0.62rem;
}

.trust-matrix b {
  font-size: 1.07rem;
  font-weight: 400;
}

.trust-matrix p {
  margin: 0.7rem 0 0;
  color: var(--muted);
  font-size: 0.86rem;
}

.code-card {
  margin-block: 1.5rem;
  border: 1px solid var(--line-strong);
  background: #08090a;
}

.code-head {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.7rem 1rem;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.61rem;
  letter-spacing: 0.06em;
}

.code-card pre {
  margin: 0;
  padding: 1.3rem;
  overflow-x: auto;
  font-size: 0.78rem;
  line-height: 1.75;
  white-space: pre;
}

.code-card pre code {
  color: var(--ink-soft);
  font-size: inherit;
}

.code-pair {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.code-pair .code-card {
  margin: 0;
}

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

.line-map > div {
  display: grid;
  grid-template-columns: minmax(10rem, 0.7fr) 1fr;
  gap: 1.5rem;
  padding: 0.9rem 0;
  border-bottom: 1px solid var(--line);
}

.line-map span {
  color: var(--muted);
  font-size: 0.86rem;
}

.build-sequence {
  margin: 2rem 0;
  padding: 0;
  border-top: 1px solid var(--line-strong);
  list-style: none;
}

.build-sequence li {
  display: grid;
  grid-template-columns: 3rem 1fr;
  gap: 1.2rem;
  padding: 1.2rem 0;
  border-bottom: 1px solid var(--line);
}

.build-sequence li > span {
  color: var(--amber);
  font-family: var(--mono);
  font-size: 0.62rem;
}

.build-sequence b {
  font-size: 1.1rem;
  font-weight: 400;
}

.build-sequence p {
  margin: 0.35rem 0 0;
  color: var(--muted);
  font-size: 0.88rem;
}

.recap-equation {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr auto 1fr auto 1fr;
  align-items: stretch;
  border: 1px solid var(--line-strong);
}

.recap-equation > div {
  min-height: 12rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 1rem;
  background: var(--panel);
}

.recap-equation > div:nth-of-type(2) {
  background: var(--violet-dim);
}

.recap-equation > div:nth-of-type(3) {
  background: var(--amber-dim);
}

.recap-equation > div:nth-of-type(4),
.recap-equation > div:nth-of-type(5) {
  background: var(--cyan-dim);
}

.recap-equation > i {
  display: grid;
  place-items: center;
  min-width: 1.5rem;
  color: var(--dim);
  background: var(--ground);
  font-family: var(--mono);
  font-style: normal;
}

.recap-equation span,
.recap-equation small {
  font-family: var(--sans);
}

.recap-equation span {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.54rem;
}

.recap-equation b {
  margin-top: 1.6rem;
  font-size: 1rem;
}

.recap-equation small {
  margin-top: 0.4rem;
  color: var(--muted);
  font-size: 0.64rem;
}

.recap-lines {
  margin-block: 2.5rem;
  border-top: 1px solid var(--line-strong);
}

.recap-lines p {
  display: grid;
  grid-template-columns: 2.5rem minmax(0, 1fr);
  gap: 1rem;
  margin: 0;
  padding: 1rem 0;
  border-bottom: 1px solid var(--line);
  color: var(--ink-soft);
}

.recap-lines p > span {
  color: var(--dim);
  font-family: var(--mono);
  font-size: 0.62rem;
}

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

.quiz {
  margin-top: 4rem;
}

.quiz-head {
  margin-bottom: 1.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--line-strong);
}

.quiz-head h3 {
  max-width: 18ch;
  margin: 0;
  font-size: clamp(1.7rem, 3vw, 2.5rem);
}

.quiz-item {
  margin-bottom: 1rem;
  padding: 1.4rem;
  border: 1px solid var(--line);
  background: var(--panel);
}

.quiz-item > p:first-child {
  display: grid;
  grid-template-columns: 2.5rem 1fr;
  gap: 1rem;
  margin: 0 0 1.2rem;
  color: var(--ink);
  font-size: 1.03rem;
}

.quiz-item > p:first-child span {
  color: var(--dim);
  font-family: var(--mono);
  font-size: 0.62rem;
}

.quiz-options {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.6rem;
}

.quiz-options button {
  min-height: 4rem;
  padding: 0.75rem;
  border: 1px solid var(--line);
  background: var(--ground);
  color: var(--muted);
  font-family: var(--sans);
  font-size: 0.72rem;
  line-height: 1.5;
  cursor: pointer;
}

.quiz-options button:hover:not(:disabled) {
  border-color: var(--violet-line);
  color: var(--ink);
}

.quiz-options button:disabled {
  cursor: default;
}

.quiz-options .is-correct {
  border-color: var(--success);
  color: var(--success);
  background: var(--success-dim);
}

.quiz-options .is-incorrect {
  border-color: var(--danger);
  color: var(--danger);
  background: var(--danger-dim);
}

.quiz-feedback {
  min-height: 1.7rem;
  margin: 0.9rem 0 0;
  font-size: 0.82rem;
}

.quiz-feedback[data-result="correct"] {
  color: var(--success);
}

.quiz-feedback[data-result="incorrect"] {
  color: var(--danger);
}

.quiz-explanation {
  margin-top: 0.8rem;
  color: var(--muted);
  font-size: 0.82rem;
}

.quiz-explanation summary {
  color: var(--muted);
  font-family: var(--sans);
  font-size: 0.7rem;
  cursor: pointer;
}

.quiz-explanation p {
  margin: 0.55rem 0 0;
}

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

.glossary > div {
  display: grid;
  grid-template-columns: 10rem 1fr;
  gap: 2rem;
  padding: 1.1rem 0;
  border-bottom: 1px solid var(--line);
}

.glossary dt {
  color: var(--cyan);
  font-family: var(--mono);
  font-size: 0.78rem;
}

.glossary dd {
  margin: 0;
  color: var(--muted);
  font-size: 0.88rem;
}

.source-policy {
  display: grid;
  grid-template-columns: 9rem 1fr;
  gap: 2rem;
  margin-block: 2.5rem;
  padding: 1.25rem;
  border: 1px solid var(--line);
  background: var(--panel);
}

.source-policy strong {
  color: var(--amber);
  font-family: var(--sans);
  font-size: 0.66rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.source-policy p {
  margin: 0;
  color: var(--muted);
  font-size: 0.88rem;
}

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

.source-item {
  display: grid;
  grid-template-columns: 3rem 1fr;
  gap: 1.2rem;
  padding: 1.1rem 0;
  border-bottom: 1px solid var(--line);
}

.source-item > span {
  color: var(--dim);
  font-family: var(--mono);
  font-size: 0.62rem;
}

.source-item a {
  font-size: 0.96rem;
}

.source-item p {
  margin: 0.3rem 0 0;
  color: var(--muted);
  font-size: 0.8rem;
}

.course-close {
  display: grid;
  grid-template-columns: 9rem minmax(0, 1.2fr) minmax(18rem, 0.8fr);
  gap: clamp(2rem, 5vw, 5rem);
  align-items: start;
  padding-block: clamp(5rem, 10vw, 9rem);
  border-top: 1px solid var(--line-strong);
}

.course-close > p {
  margin: 0;
  color: var(--cyan);
  font-family: var(--mono);
  font-size: 0.66rem;
  letter-spacing: 0.09em;
}

.course-close h2 {
  margin: 0;
  font-size: clamp(2.4rem, 5vw, 4.8rem);
  line-height: 1.12;
}

.course-close > div p {
  margin: 0 0 1.2rem;
  color: var(--muted);
  font-size: 0.98rem;
}

.site-footer {
  min-height: 8rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-family: var(--sans);
  font-size: 0.68rem;
}

.site-footer p {
  margin: 0;
}

.site-footer > a:last-child {
  text-decoration: none;
}

.js-enabled [data-reveal] {
  opacity: 0;
  transform: translateY(1.3rem);
  transition: opacity 560ms ease, transform 560ms ease;
}

.js-enabled [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

@media (max-width: 1180px) {
  .hero {
    grid-template-columns: 1fr;
    min-height: auto;
  }

  .hero-copy {
    max-width: 53rem;
  }

  .hero-visual {
    width: min(100%, 46rem);
  }

  .content-grid {
    grid-template-columns: 11rem minmax(0, 1fr);
    gap: 3.5rem;
  }

  .provider-triad,
  .path-diagram {
    grid-template-columns: 1fr;
    gap: 1px;
    border: 1px solid var(--line);
    background: var(--line);
  }

  .provider-triad article,
  .path-node {
    min-height: auto;
    border: 0;
  }

  .provider-triad h3 {
    min-height: auto;
    margin-top: 1.8rem;
  }

  .triad-link,
  .path-link {
    min-height: 3rem;
    background: var(--ground);
  }

  .triad-link::before,
  .path-link::before {
    top: 0;
    bottom: 0;
    left: 50%;
    width: 1px;
    height: auto;
  }

  .triad-link::after,
  .path-link::after,
  .path-link.reverse::after {
    right: auto;
    bottom: 0;
    left: calc(50% - 4px);
    border-top: 6px solid var(--cyan);
    border-right: 4px solid transparent;
    border-bottom: 0;
    border-left: 4px solid transparent;
  }

  .triad-link span,
  .path-link span {
    background: var(--ground);
  }

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

  .write-pipeline article:nth-child(3)::after {
    display: none;
  }

  .write-pipeline article {
    min-height: 14rem;
  }

  .write-pipeline b {
    margin-top: 3rem;
  }

  .success-ladder {
    grid-template-columns: 1fr;
    align-items: stretch;
    border: 1px solid var(--line);
  }

  .success-ladder > div {
    min-height: auto;
    border: 0;
    border-bottom: 1px solid var(--line);
  }

  .event-loop {
    grid-template-columns: 1fr;
    border: 1px solid var(--line);
    background: var(--line);
  }

  .loop-node {
    min-height: auto;
    border: 0;
  }

  .loop-arrow {
    min-height: 2.5rem;
    display: grid;
    place-items: center;
    background: var(--ground);
    transform: rotate(90deg);
  }

  .recap-equation {
    grid-template-columns: 1fr;
    background: var(--line);
    gap: 1px;
  }

  .recap-equation > div {
    min-height: 8rem;
  }

  .recap-equation > i {
    min-height: 2.2rem;
    transform: rotate(90deg);
  }
}

@media (max-width: 900px) {
  .content-grid {
    display: block;
  }

  .sidebar {
    display: none;
  }

  .chapter,
  .wide-chapter {
    width: 100%;
  }

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

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

  .thesis-item + .thesis-item {
    border-top: 1px solid var(--line);
    border-left: 0;
  }

  .thesis-item p {
    margin-top: 1.4rem;
  }

  .map-row {
    grid-template-columns: 5rem 1fr;
  }

  .map-row.map-human {
    grid-template-columns: 5rem 1fr;
  }

  .map-row .map-tag {
    grid-row: 1 / span 3;
  }

  .map-row .map-node {
    border-bottom: 1px solid var(--line);
  }

  .concept-grid.three,
  .truth-grid,
  .data-channel-grid {
    grid-template-columns: 1fr;
  }

  .concept-card,
  .truth-grid article,
  .data-channel-grid article {
    min-height: auto;
  }

  .concept-card h3,
  .truth-grid h3,
  .data-channel-grid h3 {
    margin-top: 2rem;
  }

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

  .boundary-core {
    min-height: 18rem;
  }

  .address-abi-equation {
    grid-template-columns: 1fr;
    gap: 1px;
    background: var(--line);
  }

  .address-abi-equation > i {
    min-height: 2.2rem;
    background: var(--ground);
  }

  .equation-piece {
    min-height: 7rem;
    border: 0;
    background: var(--panel);
  }

  .calldata-grid,
  .journey-result,
  .failure-result {
    grid-template-columns: 1fr 1fr;
  }

  .event-strip {
    grid-template-columns: 1fr 1fr;
  }

  .write-pipeline {
    grid-template-columns: 1fr;
  }

  .write-pipeline article {
    min-height: auto;
  }

  .write-pipeline article::after {
    top: auto;
    right: auto;
    bottom: -0.9rem;
    left: 50%;
    transform: rotate(90deg);
  }

  .write-pipeline article:nth-child(3)::after {
    display: block;
  }

  .write-pipeline article:last-child::after {
    display: none;
  }

  .write-pipeline b {
    margin-top: 2rem;
  }

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

  .lane-items > i {
    min-height: 2rem;
    display: grid;
    place-items: center;
    transform: rotate(90deg);
  }

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

  .failure-tabs {
    grid-template-columns: 1fr 1fr;
  }

  .trust-matrix,
  .code-pair {
    grid-template-columns: 1fr;
  }

  .course-close {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 700px) {
  :root {
    --gutter: 1rem;
  }

  body {
    font-size: 1rem;
    line-height: 1.82;
  }

  .masthead {
    min-height: 4.6rem;
  }

  .brand {
    font-size: 0.78rem;
  }

  .course-mark {
    font-size: 0.59rem;
  }

  .hero {
    gap: 3rem;
    padding-top: 4rem;
  }

  .hero h1 {
    font-size: clamp(2.8rem, 14vw, 4.5rem);
  }

  .hero-layer {
    grid-template-columns: 1.8rem 1fr;
  }

  .hero-layer i {
    grid-column: 2;
    justify-self: start;
  }

  .hero-meta {
    display: grid;
  }

  .hero-meta li::after {
    display: none;
  }

  .lesson-safety {
    grid-template-columns: 1fr;
    gap: 0.5rem;
  }

  .chapter h2 {
    font-size: clamp(2rem, 10.5vw, 3.2rem);
  }

  .chapter > p,
  .chapter > .lead {
    font-size: 1rem;
  }

  .map-row,
  .map-row.map-human {
    grid-template-columns: 3.2rem 1fr;
  }

  .map-tag {
    padding: 0.6rem;
  }

  .layer-lab-layout,
  .layer-result {
    grid-template-columns: 1fr;
  }

  .layer-result > div {
    min-height: auto;
  }

  .lab-head {
    align-items: start;
    flex-direction: column;
  }

  .definition-stack > div,
  .glossary > div,
  .source-policy,
  .line-map > div {
    grid-template-columns: 1fr;
    gap: 0.5rem;
  }

  .split-explainer,
  .myth-fact {
    grid-template-columns: 1fr;
  }

  .split-explainer article {
    min-height: auto;
  }

  .split-explainer h3 {
    margin-top: 1.8rem;
  }

  .button-row {
    display: grid;
    grid-template-columns: 1fr;
  }

  .calldata-grid,
  .journey-result,
  .failure-result,
  .event-strip {
    grid-template-columns: 1fr;
  }

  .calldata-grid > div,
  .journey-result > div,
  .failure-result > div,
  .event-strip > div {
    min-height: auto;
  }

  .journey-track li {
    grid-template-columns: 2rem 1fr;
  }

  .journey-track li > i {
    grid-column: 2;
    justify-self: start;
  }

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

  .failure-tabs {
    grid-template-columns: 1fr;
  }

  .trust-matrix article {
    grid-template-columns: 2rem 1fr;
  }

  .code-head {
    align-items: start;
    flex-direction: column;
  }

  .recap-lines p {
    grid-template-columns: 1fr;
    gap: 0.3rem;
  }

  .quiz-options {
    grid-template-columns: 1fr;
  }

  .site-footer {
    align-items: start;
    flex-direction: column;
    justify-content: center;
    gap: 0.5rem;
  }
}

@media (max-width: 500px) {
  .hero h1 {
    font-size: 2.7rem;
  }

  .course-mark {
    max-width: 11rem;
  }

  .hero-stack {
    padding: 0.55rem;
  }

  .hero-layer {
    padding: 0.75rem;
  }

  .lab-head,
  .button-row,
  .failure-tabs,
  .rpc-sample,
  .static-note {
    padding-inline: 1rem;
  }

  .quiz-item {
    padding: 1rem;
  }
}

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

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

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

@media (forced-colors: active) {
  :root {
    --line: CanvasText;
    --line-strong: CanvasText;
  }

  button,
  .lab,
  .diagram,
  .concept-card,
  .quiz-item,
  .protocol-note,
  .warning-note,
  .status-note,
  .deep-dive {
    forced-color-adjust: auto;
  }

  .layer-controls button[aria-pressed="true"],
  .button-row button[aria-pressed="true"],
  .button-row button[aria-selected="true"],
  .failure-tabs button[aria-selected="true"] {
    outline: 3px solid Highlight;
    outline-offset: -4px;
  }
}

@media print {
  :root {
    color-scheme: light;
    --ink: #111;
    --ink-soft: #222;
    --muted: #555;
    --dim: #666;
    --void: #fff;
    --ground: #fff;
    --panel: #fff;
    --panel-2: #f5f5f5;
    --panel-3: #eee;
    --line: rgba(0, 0, 0, 0.18);
    --line-strong: rgba(0, 0, 0, 0.45);
    --violet: #4c42a8;
    --violet-dim: rgba(76, 66, 168, 0.06);
    --violet-line: rgba(76, 66, 168, 0.45);
    --cyan: #176a61;
    --cyan-dim: rgba(23, 106, 97, 0.06);
    --cyan-line: rgba(23, 106, 97, 0.45);
    --amber: #805d1f;
    --amber-dim: rgba(128, 93, 31, 0.06);
    --amber-line: rgba(128, 93, 31, 0.45);
    --danger: #913b2f;
    --danger-dim: rgba(145, 59, 47, 0.06);
    --success: #286a3a;
    --success-dim: rgba(40, 106, 58, 0.06);
  }

  body {
    background: #fff;
    font-size: 10.5pt;
  }

  body::before,
  .reading-progress,
  .sidebar,
  .hero-meta,
  .button-row,
  .failure-tabs,
  .quiz-feedback {
    display: none !important;
  }

  .site-header,
  .page,
  .site-footer {
    width: 100%;
  }

  .hero {
    min-height: 0;
    padding-block: 2rem;
    grid-template-columns: 1fr 1fr;
  }

  .content-grid {
    display: block;
  }

  .chapter,
  .wide-chapter {
    width: 100%;
    max-width: none;
    margin-bottom: 3rem;
    break-before: page;
  }

  .chapter:first-child {
    break-before: auto;
  }

  .diagram,
  .lab,
  .concept-card,
  .quiz-item,
  .deep-dive,
  .protocol-note,
  .warning-note,
  .status-note,
  .code-card {
    break-inside: avoid;
    box-shadow: none;
  }

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

  .quiz-explanation {
    display: block;
  }

  .quiz-explanation summary {
    list-style: none;
  }

  a {
    text-decoration: none;
  }

  .course-close {
    break-before: page;
  }
}