:root {
  --void: #050505;
  --deep: #09090a;
  --panel: #0d0d0f;
  --panel-raised: #121214;
  --panel-bright: #17171a;
  --paper: #f5f0e6;
  --soft-paper: #d9d3c8;
  --muted: #938d84;
  --faint: #837e76;
  --line: rgba(245, 240, 230, 0.14);
  --line-strong: rgba(245, 240, 230, 0.34);
  --purple: #a89fff;
  --purple-soft: rgba(168, 159, 255, 0.12);
  --cyan: #96d8cf;
  --cyan-soft: rgba(150, 216, 207, 0.11);
  --amber: #dbb878;
  --amber-soft: rgba(219, 184, 120, 0.1);
  --danger: #dc9180;
  --danger-soft: rgba(220, 145, 128, 0.11);
  --success: #b8d5bd;
  --success-soft: rgba(184, 213, 189, 0.1);
  --display: "Songti SC", "STSong", "Noto Serif CJK SC", "Source Han Serif SC", serif;
  --sans: Inter, "Helvetica Neue", Helvetica, Arial, "PingFang SC", sans-serif;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  --shell: 82rem;
  --measure: 46rem;
  --wide: 65rem;
  --gutter: clamp(1.25rem, 5vw, 4rem);
}

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

html {
  min-width: 20rem;
  background: var(--void);
  scroll-behavior: smooth;
  scroll-padding-top: 5rem;
}

body {
  min-height: 100dvh;
  margin: 0;
  color: var(--paper);
  background:
    radial-gradient(68rem 42rem at 76% -8%, rgba(168, 159, 255, 0.09), transparent 68%),
    radial-gradient(50rem 38rem at 8% 34%, rgba(150, 216, 207, 0.035), transparent 72%),
    linear-gradient(rgba(245, 240, 230, 0.02) 1px, transparent 1px) 0 0 / 100% 12rem,
    var(--void);
  font-family: var(--display);
  font-synthesis: none;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body::before {
  position: fixed;
  inset: 0;
  z-index: -1;
  content: "";
  pointer-events: none;
  opacity: 0.18;
  background-image:
    repeating-radial-gradient(circle at 17% 23%, rgba(255, 255, 255, 0.04) 0 1px, transparent 1px 7px),
    repeating-radial-gradient(circle at 79% 61%, rgba(255, 255, 255, 0.018) 0 1px, transparent 1px 9px);
  background-size: 137px 121px, 181px 157px;
  mix-blend-mode: soft-light;
}

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

a {
  color: inherit;
  text-decoration-color: var(--line-strong);
  text-underline-offset: 0.24em;
}

button,
input {
  font: inherit;
}

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

:focus-visible {
  outline: 1px solid var(--paper);
  outline-offset: 5px;
}

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

code {
  color: var(--cyan);
  font-size: 0.88em;
}

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

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

.skip-link {
  position: fixed;
  top: 0.75rem;
  left: 0.75rem;
  z-index: 90;
  padding: 0.72rem 0.92rem;
  color: var(--void);
  background: var(--paper);
  font-family: var(--sans);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-decoration: none;
  transform: translateY(-160%);
  transition: transform 180ms ease;
}

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

.reading-progress {
  position: fixed;
  top: 0;
  right: 0;
  left: 0;
  z-index: 80;
  height: 2px;
  background: rgba(245, 240, 230, 0.04);
  pointer-events: none;
}

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

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

.site-header {
  position: relative;
  z-index: 10;
  border-bottom: 1px solid var(--line);
}

.masthead {
  min-height: 5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
}

.brand {
  font-family: var(--sans);
  font-size: 0.92rem;
  font-weight: 500;
  letter-spacing: 0.36em;
  text-decoration: none;
}

.course-mark {
  margin: 0;
  color: var(--muted);
  font-family: var(--sans);
  font-size: 0.68rem;
  letter-spacing: 0.18em;
  line-height: 1.55;
  text-align: right;
  text-transform: uppercase;
}

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

.hero {
  position: relative;
  min-height: min(54rem, calc(100dvh - 5rem));
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(19rem, 0.72fr);
  gap: clamp(3rem, 7vw, 7rem);
  align-items: end;
  padding: clamp(5.5rem, 12vw, 10rem) 0 clamp(4rem, 8vw, 6.5rem);
  border-bottom: 1px solid var(--line-strong);
  isolation: isolate;
  overflow: hidden;
}

.hero::after {
  position: absolute;
  right: -0.06em;
  bottom: -0.3em;
  z-index: -2;
  color: rgba(245, 240, 230, 0.024);
  content: "1155";
  font-family: var(--mono);
  font-size: clamp(10rem, 27vw, 25rem);
  font-weight: 400;
  letter-spacing: -0.09em;
  line-height: 1;
  pointer-events: none;
  user-select: none;
}

.eyebrow,
.chapter-number,
.lab-kicker,
.micro-label {
  color: var(--muted);
  font-family: var(--sans);
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  line-height: 1.5;
  text-transform: uppercase;
}

.eyebrow {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin: 0 0 1.7rem;
}

.eyebrow::before {
  width: 2.8rem;
  height: 1px;
  background: var(--line-strong);
  content: "";
}

h1,
h2,
h3,
h4,
p {
  text-wrap: pretty;
}

h1 {
  max-width: 10.4ch;
  margin: 0;
  font-size: clamp(3.45rem, 8.2vw, 7.6rem);
  font-weight: 400;
  letter-spacing: 0.02em;
  line-height: 0.98;
}

h1 em {
  color: var(--purple);
  font-style: normal;
}

.hero-deck {
  max-width: 37rem;
  margin: 2.1rem 0 0;
  color: var(--soft-paper);
  font-size: clamp(1.08rem, 1.5vw, 1.28rem);
  line-height: 1.85;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem 1.4rem;
  margin: 2.4rem 0 0;
  padding: 0;
  color: var(--muted);
  font-family: var(--sans);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  list-style: none;
}

.hero-meta li {
  position: relative;
}

.hero-meta li + li::before {
  position: absolute;
  left: -0.82rem;
  color: var(--faint);
  content: "/";
}

.hero-visual {
  align-self: center;
}

.vault-console {
  position: relative;
  border-top: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line-strong);
  background: linear-gradient(135deg, rgba(168, 159, 255, 0.055), transparent 50%);
}

.vault-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.85rem 0;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.66rem;
  letter-spacing: 0.08em;
}

.status-dot {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  color: var(--cyan);
}

.status-dot::before {
  width: 0.42rem;
  height: 0.42rem;
  border-radius: 50%;
  background: currentColor;
  box-shadow: 0 0 1.2rem currentColor;
  content: "";
}

.vault-address {
  padding: 1.5rem 0 1.2rem;
}

.vault-address span {
  display: block;
  margin-bottom: 0.42rem;
  color: var(--muted);
  font-family: var(--sans);
  font-size: 0.6rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.vault-address strong {
  font-family: var(--mono);
  font-size: clamp(1rem, 2.4vw, 1.32rem);
  font-weight: 400;
  letter-spacing: 0.03em;
}

.vault-assets {
  display: grid;
  gap: 1px;
  background: var(--line);
  border-top: 1px solid var(--line);
}

.vault-asset {
  display: grid;
  grid-template-columns: 4.2rem 1fr auto;
  gap: 1rem;
  align-items: center;
  padding: 1rem 0.92rem;
  background: rgba(5, 5, 5, 0.91);
}

.vault-id {
  color: var(--purple);
  font-family: var(--mono);
  font-size: 0.72rem;
}

.vault-asset b {
  font-size: 1rem;
  font-weight: 400;
}

.vault-asset small {
  color: var(--muted);
  font-family: var(--sans);
  font-size: 0.65rem;
  letter-spacing: 0.06em;
}

.vault-foot {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.9rem 0;
  color: var(--muted);
  font-family: var(--sans);
  font-size: 0.64rem;
  letter-spacing: 0.07em;
}

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

.thesis-item {
  min-height: 13rem;
  padding: 2.8rem clamp(1.4rem, 3vw, 2.7rem) 2.8rem 0;
}

.thesis-item + .thesis-item {
  padding-left: clamp(1.4rem, 3vw, 2.7rem);
  border-left: 1px solid var(--line);
}

.thesis-index {
  display: block;
  margin-bottom: 2.2rem;
  color: var(--purple);
  font-family: var(--mono);
  font-size: 0.68rem;
}

.thesis-item p {
  margin: 0;
  color: var(--soft-paper);
  font-size: 1.02rem;
  line-height: 1.75;
}

.thesis-item strong {
  color: var(--paper);
  font-weight: 400;
}

.content-grid {
  display: grid;
  grid-template-columns: 14rem minmax(0, 1fr);
  gap: clamp(3rem, 7vw, 7rem);
  padding: clamp(5.5rem, 10vw, 9rem) 0 9rem;
}

.sidebar {
  min-width: 0;
}

.toc {
  position: sticky;
  top: 4rem;
}

.toc-title {
  margin: 0 0 1.5rem;
  color: var(--paper);
  font-family: var(--sans);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
}

.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 {
  display: grid;
  grid-template-columns: 2rem 1fr;
  gap: 0.45rem;
  padding: 0.84rem 0;
  color: var(--muted);
  font-family: var(--sans);
  font-size: 0.7rem;
  letter-spacing: 0.04em;
  line-height: 1.45;
  text-decoration: none;
  transition: color 180ms ease, padding-left 180ms ease;
}

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

.toc a:hover,
.toc a:focus-visible,
.toc a[aria-current="true"] {
  padding-left: 0.45rem;
  color: var(--paper);
}

.toc a[aria-current="true"]::before {
  color: var(--purple);
}

.lesson {
  min-width: 0;
}

.chapter {
  width: min(100%, var(--measure));
  margin-bottom: clamp(6.5rem, 11vw, 10rem);
  scroll-margin-top: 5rem;
}

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

.chapter-header {
  max-width: var(--measure);
  margin-bottom: 2.5rem;
}

.chapter-number {
  margin: 0 0 1.2rem;
}

.chapter h2 {
  margin: 0;
  font-size: clamp(2.35rem, 5vw, 4.25rem);
  font-weight: 400;
  letter-spacing: 0.01em;
  line-height: 1.08;
}

.section-deck {
  margin: 1.35rem 0 0;
  color: var(--muted);
  font-family: var(--sans);
  font-size: 0.76rem;
  letter-spacing: 0.08em;
  line-height: 1.7;
}

.chapter > p,
.chapter > div > p,
.chapter > aside > p,
.chapter li {
  color: var(--soft-paper);
  font-size: 1.04rem;
  line-height: 1.9;
}

.chapter p {
  margin-top: 0;
}

.chapter p + p {
  margin-top: 1.25rem;
}

.chapter .lead {
  max-width: var(--measure);
  margin-bottom: 2.5rem;
  color: var(--paper);
  font-size: clamp(1.2rem, 2vw, 1.48rem);
  line-height: 1.85;
}

.chapter h3 {
  max-width: var(--measure);
  margin: 4rem 0 1.25rem;
  font-size: clamp(1.55rem, 3vw, 2.25rem);
  font-weight: 400;
  line-height: 1.3;
}

.chapter h4 {
  margin: 0;
  font-size: 1.08rem;
  font-weight: 400;
  line-height: 1.45;
}

.chapter strong {
  color: var(--paper);
  font-weight: 400;
}

.formula {
  max-width: var(--measure);
  margin: 2rem 0;
  padding: 1.45rem 0;
  border-top: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line-strong);
  color: var(--paper);
  font-family: var(--mono);
  font-size: clamp(0.85rem, 2vw, 1.04rem);
  line-height: 1.8;
  overflow-wrap: anywhere;
}

.formula b {
  color: var(--purple);
  font-weight: 400;
}

.precision-note,
.warning-note,
.protocol-note,
.success-note {
  max-width: var(--measure);
  margin: 2.3rem 0;
  padding: 1.35rem 1.45rem;
  border-left: 2px solid var(--amber);
  background: var(--amber-soft);
  color: var(--soft-paper);
}

.precision-note {
  border-color: var(--cyan);
  background: var(--cyan-soft);
}

.warning-note {
  border-color: var(--danger);
  background: var(--danger-soft);
}

.success-note {
  border-color: var(--success);
  background: var(--success-soft);
}

.protocol-note {
  border-color: var(--purple);
  background: var(--purple-soft);
}

.precision-note strong,
.warning-note strong,
.protocol-note strong,
.success-note strong {
  display: block;
  margin-bottom: 0.45rem;
  font-family: var(--sans);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.precision-note p,
.warning-note p,
.protocol-note p,
.success-note p {
  margin: 0;
  font-size: 0.98rem;
  line-height: 1.8;
}

.scenario-grid,
.concept-grid,
.audit-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 2.4rem 0;
  background: var(--line);
  border: 1px solid var(--line);
}

.scenario-card,
.concept-card,
.audit-card {
  min-width: 0;
  padding: 1.45rem;
  background: var(--deep);
}

.scenario-card span,
.concept-card span,
.audit-card span {
  display: block;
  margin-bottom: 1.1rem;
  color: var(--purple);
  font-family: var(--mono);
  font-size: 0.66rem;
  letter-spacing: 0.08em;
}

.scenario-card p,
.concept-card p,
.audit-card p {
  margin: 0.75rem 0 0;
  color: var(--muted);
  font-family: var(--sans);
  font-size: 0.82rem;
  line-height: 1.7;
}

.scenario-card strong {
  display: block;
  margin-bottom: 0.25rem;
  font-size: 1.15rem;
}

.one-contract-map {
  margin: 3rem 0;
  border-top: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line-strong);
}

.map-head {
  display: grid;
  grid-template-columns: 1.1fr 1fr 0.8fr 1.4fr;
  gap: 1px;
  background: var(--line);
  border-bottom: 1px solid var(--line);
}

.map-head span {
  padding: 0.72rem 0.85rem;
  color: var(--muted);
  background: var(--void);
  font-family: var(--sans);
  font-size: 0.62rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.map-row {
  display: grid;
  grid-template-columns: 1.1fr 1fr 0.8fr 1.4fr;
  gap: 1px;
  background: var(--line);
}

.map-row > span {
  min-width: 0;
  padding: 1rem 0.85rem;
  background: var(--deep);
  font-family: var(--sans);
  font-size: 0.78rem;
  line-height: 1.55;
  overflow-wrap: anywhere;
}

.map-row .map-contract {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.68rem;
}

.map-row .map-id {
  color: var(--purple);
  font-family: var(--mono);
}

.map-row .map-amount {
  color: var(--cyan);
  font-family: var(--mono);
}

.diagram-caption {
  margin: 0.8rem 0 0;
  color: var(--muted);
  font-family: var(--sans);
  font-size: 0.7rem;
  line-height: 1.65;
}

.ledger-diagram {
  margin: 2.8rem 0;
  border-top: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line-strong);
  overflow: hidden;
}

.ledger-grid {
  display: grid;
  grid-template-columns: minmax(7rem, 1.15fr) repeat(3, minmax(5rem, 1fr));
  gap: 1px;
  background: var(--line);
}

.ledger-cell {
  min-width: 0;
  min-height: 4.2rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 0.8rem;
  background: var(--deep);
}

.ledger-cell.head {
  min-height: 3.1rem;
  color: var(--muted);
  background: var(--void);
  font-family: var(--sans);
  font-size: 0.62rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.ledger-cell.asset {
  color: var(--paper);
  font-size: 0.93rem;
}

.ledger-cell.asset small {
  margin-top: 0.35rem;
  color: var(--purple);
  font-family: var(--mono);
  font-size: 0.62rem;
}

.ledger-value {
  align-items: flex-end;
  color: var(--cyan);
  font-family: var(--mono);
  font-size: 0.88rem;
}

.ledger-value.zero {
  color: var(--faint);
}

.lab {
  margin: 3rem 0;
  border-top: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line-strong);
  background: linear-gradient(145deg, rgba(168, 159, 255, 0.045), rgba(150, 216, 207, 0.018));
}

.lab-head {
  display: flex;
  justify-content: space-between;
  gap: 2rem;
  padding: 1.6rem 0;
  border-bottom: 1px solid var(--line);
}

.lab-head h3 {
  margin: 0.35rem 0 0;
  font-size: clamp(1.45rem, 3vw, 2rem);
}

.lab-head p {
  margin: 0;
}

.lab-head > p {
  max-width: 24rem;
  color: var(--muted);
  font-family: var(--sans);
  font-size: 0.75rem;
  line-height: 1.65;
}

.lab-body {
  padding: 1.8rem 0 2rem;
}

.asset-selector,
.receiver-controls,
.view-switch {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin-bottom: 1.5rem;
}

.asset-button,
.receiver-button,
.view-button,
.quiz-option,
.copy-button {
  min-height: 2.7rem;
  padding: 0.68rem 0.86rem;
  border: 1px solid var(--line);
  border-radius: 0;
  color: var(--soft-paper);
  background: var(--deep);
  font-family: var(--sans);
  font-size: 0.74rem;
  letter-spacing: 0.03em;
  cursor: pointer;
  transition: color 180ms ease, background 180ms ease, border-color 180ms ease;
}

.asset-button:hover,
.receiver-button:hover,
.view-button:hover,
.quiz-option:hover,
.copy-button:hover,
.asset-button[aria-selected="true"],
.receiver-button[aria-pressed="true"],
.view-button[aria-pressed="true"] {
  color: var(--paper);
  border-color: var(--line-strong);
  background: var(--purple-soft);
}

.asset-button[aria-selected="true"] {
  border-color: var(--purple);
}

.asset-detail {
  display: grid;
  grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.18fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.asset-summary,
.balance-view {
  min-width: 0;
  padding: 1.45rem;
  background: var(--deep);
}

.asset-summary .asset-kind {
  margin: 0 0 0.8rem;
  color: var(--purple);
  font-family: var(--sans);
  font-size: 0.66rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.asset-summary h4 {
  font-size: 1.45rem;
}

.asset-summary p {
  margin: 0.8rem 0 0;
  color: var(--muted);
  font-family: var(--sans);
  font-size: 0.78rem;
  line-height: 1.7;
}

.balance-view {
  display: grid;
  gap: 0.9rem;
}

.balance-row {
  display: grid;
  grid-template-columns: 3.3rem minmax(0, 1fr) auto;
  gap: 0.7rem;
  align-items: center;
  color: var(--muted);
  font-family: var(--sans);
  font-size: 0.7rem;
}

.balance-track {
  height: 0.36rem;
  background: rgba(245, 240, 230, 0.07);
}

.balance-fill {
  display: block;
  width: var(--balance);
  height: 100%;
  background: var(--cyan);
  transition: width 300ms ease;
}

.balance-number {
  min-width: 4.2rem;
  color: var(--paper);
  font-family: var(--mono);
  text-align: right;
}

.comparison-table {
  width: 100%;
  margin: 2.5rem 0;
  border-collapse: collapse;
  table-layout: fixed;
}

.table-responsive {
  max-width: 100%;
  overflow-x: auto;
}

.table-responsive .comparison-table {
  min-width: 46rem;
}

.comparison-table th,
.comparison-table td {
  padding: 1rem 0.9rem;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

.comparison-table th {
  color: var(--muted);
  font-family: var(--sans);
  font-size: 0.65rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.comparison-table td {
  color: var(--soft-paper);
  font-family: var(--sans);
  font-size: 0.78rem;
  line-height: 1.65;
}

.comparison-table td:first-child {
  color: var(--paper);
  font-family: var(--display);
  font-size: 0.96rem;
}

.comparison-table .highlight-column {
  background: var(--purple-soft);
}

.architecture-compare {
  display: grid;
  grid-template-columns: 1fr 4.5rem 1fr;
  gap: 1rem;
  align-items: stretch;
  margin: 3rem 0;
}

.architecture-side {
  padding: 1.35rem;
  border-top: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line-strong);
}

.architecture-side h4 {
  margin-bottom: 1.3rem;
}

.contract-stack {
  display: grid;
  gap: 0.48rem;
}

.contract-node {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 0.7rem;
  align-items: center;
  padding: 0.72rem 0.78rem;
  border: 1px solid var(--line);
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.64rem;
}

.contract-node b {
  color: var(--paper);
  font-weight: 400;
}

.contract-node em {
  color: var(--purple);
  font-style: normal;
}

.architecture-arrow {
  display: grid;
  place-items: center;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.66rem;
  line-height: 1.7;
  text-align: center;
}

.interface-surface {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 2.6rem 0;
  background: var(--line);
  border: 1px solid var(--line);
}

.surface-group {
  padding: 1.35rem;
  background: var(--deep);
}

.surface-group .micro-label {
  margin: 0 0 1rem;
  color: var(--purple);
}

.surface-list {
  display: grid;
  gap: 0.65rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.surface-list li {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 1rem;
  padding-bottom: 0.65rem;
  border-bottom: 1px solid var(--line);
  font-family: var(--mono);
  font-size: 0.68rem;
  line-height: 1.55;
}

.surface-list li:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.surface-list span {
  color: var(--muted);
  font-family: var(--sans);
  font-size: 0.65rem;
}

pre {
  position: relative;
  max-width: 100%;
  margin: 2.3rem 0;
  padding: 1.35rem;
  border-top: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line-strong);
  color: var(--soft-paper);
  background: var(--deep);
  font-size: 0.73rem;
  line-height: 1.75;
  overflow: auto;
  tab-size: 2;
}

pre code {
  color: inherit;
  font-size: inherit;
}

.code-frame {
  position: relative;
}

.copy-button {
  position: absolute;
  top: 0.65rem;
  right: 0.65rem;
  z-index: 2;
  min-height: 2.1rem;
  padding: 0.45rem 0.66rem;
  font-size: 0.64rem;
}

.interface-id-table {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin: 2rem 0;
  background: var(--line);
  border: 1px solid var(--line);
}

.interface-id {
  padding: 1.15rem;
  background: var(--deep);
}

.interface-id b {
  display: block;
  margin-bottom: 0.6rem;
  color: var(--purple);
  font-family: var(--mono);
  font-size: 0.78rem;
  font-weight: 400;
}

.interface-id span {
  color: var(--muted);
  font-family: var(--sans);
  font-size: 0.68rem;
  line-height: 1.6;
}

.batch-controls {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

.batch-choice {
  position: relative;
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 0.75rem;
  align-items: center;
  padding: 0.9rem 1rem;
  border: 1px solid var(--line);
  color: var(--soft-paper);
  background: var(--deep);
  cursor: pointer;
}

.batch-choice input {
  width: 1rem;
  height: 1rem;
  margin: 0;
  accent-color: var(--purple);
}

.batch-choice span {
  font-family: var(--sans);
  font-size: 0.76rem;
}

.batch-choice code {
  color: var(--purple);
  font-size: 0.68rem;
}

.batch-stage {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 5.5rem minmax(0, 1fr);
  gap: 1rem;
  align-items: stretch;
  margin-top: 1.6rem;
}

.wallet-box,
.receiver-box {
  min-height: 13rem;
  padding: 1.15rem;
  border-top: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line-strong);
  background: var(--deep);
}

.wallet-box h4,
.receiver-box h4 {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.2rem;
}

.wallet-box h4 span,
.receiver-box h4 span {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.62rem;
}

.token-pile {
  display: flex;
  flex-wrap: wrap;
  gap: 0.48rem;
}

.token-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.55rem 0.62rem;
  border: 1px solid var(--line);
  color: var(--soft-paper);
  font-family: var(--sans);
  font-size: 0.67rem;
  transition: opacity 300ms ease, transform 300ms ease;
}

.token-chip::before {
  width: 0.4rem;
  height: 0.4rem;
  background: var(--purple);
  content: "";
}

.token-chip[data-selected="false"] {
  opacity: 0.22;
}

.batch-route {
  display: grid;
  align-content: center;
  justify-items: center;
  gap: 0.55rem;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.62rem;
  text-align: center;
}

.batch-route strong {
  color: var(--cyan);
  font-size: 1.75rem;
  font-weight: 400;
}

.batch-route span {
  line-height: 1.45;
}

.batch-result {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin-top: 1.2rem;
  background: var(--line);
  border: 1px solid var(--line);
}

.result-stat {
  padding: 1rem;
  background: var(--deep);
}

.result-stat span {
  display: block;
  margin-bottom: 0.55rem;
  color: var(--muted);
  font-family: var(--sans);
  font-size: 0.62rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.result-stat strong {
  color: var(--paper);
  font-family: var(--mono);
  font-size: 1.08rem;
  font-weight: 400;
}

.result-stat small {
  display: block;
  margin-top: 0.42rem;
  color: var(--faint);
  font-family: var(--sans);
  font-size: 0.62rem;
  line-height: 1.5;
}

.receiver-flow {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  margin: 2.5rem 0;
  background: var(--line);
  border: 1px solid var(--line);
}

.receiver-step {
  position: relative;
  min-height: 10.5rem;
  padding: 1.2rem;
  background: var(--deep);
}

.receiver-step::after {
  position: absolute;
  top: 50%;
  right: -0.65rem;
  z-index: 2;
  width: 1.3rem;
  color: var(--muted);
  background: var(--deep);
  content: "→";
  font-family: var(--mono);
  text-align: center;
  transform: translateY(-50%);
}

.receiver-step:last-child::after {
  display: none;
}

.receiver-step span {
  color: var(--purple);
  font-family: var(--mono);
  font-size: 0.62rem;
}

.receiver-step h4 {
  margin: 1.25rem 0 0.7rem;
}

.receiver-step p {
  margin: 0;
  color: var(--muted);
  font-family: var(--sans);
  font-size: 0.7rem;
  line-height: 1.6;
}

.receiver-outcome {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.receiver-contract,
.receiver-status {
  padding: 1.35rem;
  background: var(--deep);
}

.receiver-contract {
  font-family: var(--mono);
  font-size: 0.7rem;
  line-height: 1.75;
}

.receiver-contract .hook-return {
  color: var(--cyan);
}

.receiver-status strong {
  display: block;
  margin-bottom: 0.7rem;
  font-size: 1.35rem;
}

.receiver-status p {
  margin: 0;
  color: var(--muted);
  font-family: var(--sans);
  font-size: 0.76rem;
  line-height: 1.7;
}

.scope-diagram {
  display: grid;
  grid-template-columns: 1fr 5rem 1fr;
  gap: 1rem;
  align-items: center;
  margin: 2.7rem 0;
}

.scope-owner,
.scope-operator {
  padding: 1.3rem;
  border-top: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line-strong);
}

.scope-owner h4,
.scope-operator h4 {
  margin-bottom: 1rem;
}

.scope-assets {
  display: grid;
  gap: 0.45rem;
}

.scope-asset {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.65rem 0.7rem;
  border: 1px solid var(--line);
  color: var(--soft-paper);
  font-family: var(--sans);
  font-size: 0.68rem;
}

.scope-asset code {
  color: var(--purple);
}

.scope-arrow {
  color: var(--danger);
  font-family: var(--mono);
  font-size: 0.65rem;
  line-height: 1.6;
  text-align: center;
}

.scope-arrow b {
  display: block;
  margin-bottom: 0.35rem;
  font-size: 1.5rem;
  font-weight: 400;
}

.scope-operator {
  background: var(--danger-soft);
}

.scope-operator p {
  margin: 0;
  color: var(--soft-paper);
  font-family: var(--sans);
  font-size: 0.76rem;
  line-height: 1.75;
}

.uri-lab-grid {
  display: grid;
  grid-template-columns: 0.7fr 1.3fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.uri-input-panel,
.uri-output-panel {
  min-width: 0;
  padding: 1.35rem;
  background: var(--deep);
}

.uri-input-panel label {
  display: block;
  margin-bottom: 0.7rem;
  color: var(--muted);
  font-family: var(--sans);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
}

.uri-input-panel input {
  width: 100%;
  min-height: 3rem;
  padding: 0.75rem;
  border: 1px solid var(--line-strong);
  border-radius: 0;
  color: var(--paper);
  background: var(--void);
  font-family: var(--mono);
  font-size: 0.82rem;
}

.uri-input-panel p {
  margin: 0.8rem 0 0;
  color: var(--faint);
  font-family: var(--sans);
  font-size: 0.66rem;
  line-height: 1.6;
}

.uri-line {
  margin-bottom: 1rem;
}

.uri-line:last-child {
  margin-bottom: 0;
}

.uri-line span {
  display: block;
  margin-bottom: 0.42rem;
  color: var(--muted);
  font-family: var(--sans);
  font-size: 0.62rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.uri-line code {
  display: block;
  padding: 0.65rem;
  color: var(--cyan);
  background: var(--void);
  font-size: 0.68rem;
  line-height: 1.65;
  overflow-wrap: anywhere;
}

.event-stream {
  margin: 2.6rem 0;
  border-top: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line-strong);
}

.event-row {
  display: grid;
  grid-template-columns: 7rem 1.25fr 1fr;
  gap: 1rem;
  padding: 1rem 0;
  border-bottom: 1px solid var(--line);
}

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

.event-name {
  color: var(--purple);
  font-family: var(--mono);
  font-size: 0.68rem;
}

.event-payload {
  color: var(--soft-paper);
  font-family: var(--mono);
  font-size: 0.66rem;
  line-height: 1.65;
  overflow-wrap: anywhere;
}

.event-meaning {
  color: var(--muted);
  font-family: var(--sans);
  font-size: 0.7rem;
  line-height: 1.65;
}

.checklist {
  display: grid;
  gap: 0;
  margin: 2.5rem 0;
  padding: 0;
  border-top: 1px solid var(--line-strong);
  list-style: none;
}

.checklist li {
  display: grid;
  grid-template-columns: 2.7rem minmax(0, 1fr);
  gap: 1rem;
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--line);
}

.checklist li::before {
  color: var(--purple);
  content: counter(list-item, decimal-leading-zero);
  font-family: var(--mono);
  font-size: 0.68rem;
}

.checklist b {
  display: block;
  margin-bottom: 0.38rem;
  color: var(--paper);
  font-weight: 400;
}

.checklist span {
  display: block;
  color: var(--muted);
  font-family: var(--sans);
  font-size: 0.78rem;
  line-height: 1.7;
}

.recap-equation {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 1px;
  margin: 2.5rem 0;
  background: var(--line);
  border: 1px solid var(--line);
}

.recap-part {
  position: relative;
  min-height: 9.5rem;
  padding: 1.1rem;
  background: var(--deep);
}

.recap-part::after {
  position: absolute;
  top: 50%;
  right: -0.68rem;
  z-index: 2;
  width: 1.35rem;
  color: var(--muted);
  background: var(--deep);
  content: "+";
  font-family: var(--mono);
  text-align: center;
}

.recap-part:last-child::after {
  display: none;
}

.recap-part span {
  color: var(--purple);
  font-family: var(--mono);
  font-size: 0.62rem;
}

.recap-part h4 {
  margin: 1.2rem 0 0.6rem;
}

.recap-part p {
  margin: 0;
  color: var(--muted);
  font-family: var(--sans);
  font-size: 0.68rem;
  line-height: 1.55;
}

.quiz {
  display: grid;
  gap: 1px;
  margin: 2.4rem 0;
  background: var(--line);
  border: 1px solid var(--line);
}

.quiz-item {
  padding: 1.45rem;
  background: var(--deep);
}

.quiz-question {
  margin: 0 0 1.15rem;
  color: var(--paper);
  font-size: 1.02rem;
  line-height: 1.7;
}

.quiz-options {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.55rem;
}

.quiz-option {
  height: auto;
  min-height: 3.7rem;
  text-align: left;
  line-height: 1.5;
}

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

.quiz-option.is-wrong {
  color: var(--danger);
  border-color: var(--danger);
  background: var(--danger-soft);
}

.quiz-feedback {
  margin: 1rem 0 0;
  color: var(--muted);
  font-family: var(--sans);
  font-size: 0.75rem;
  line-height: 1.65;
}

.quiz-explanation {
  margin: 0.75rem 0 0;
  padding-top: 0.75rem;
  border-top: 1px solid var(--line);
  color: var(--soft-paper);
  font-family: var(--sans);
  font-size: 0.76rem;
  line-height: 1.7;
}

.js .quiz-explanation {
  display: none;
}

.source-list {
  display: grid;
  gap: 0;
  margin: 2.3rem 0;
  padding: 0;
  border-top: 1px solid var(--line-strong);
  list-style: none;
}

.source-item {
  display: grid;
  grid-template-columns: 2.5rem minmax(0, 1fr);
  gap: 1rem;
  padding: 1.1rem 0;
  border-bottom: 1px solid var(--line);
}

.source-index {
  color: var(--purple);
  font-family: var(--mono);
  font-size: 0.68rem;
}

.source-item a {
  color: var(--paper);
  font-size: 0.94rem;
  line-height: 1.55;
}

.source-item p {
  margin: 0.35rem 0 0;
  color: var(--muted);
  font-family: var(--sans);
  font-size: 0.72rem;
  line-height: 1.65;
}

.glossary {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 2.5rem 0;
  background: var(--line);
  border: 1px solid var(--line);
}

.term {
  padding: 1.15rem;
  background: var(--deep);
}

.term dt {
  margin-bottom: 0.5rem;
  color: var(--paper);
  font-family: var(--mono);
  font-size: 0.72rem;
}

.term dd {
  margin: 0;
  color: var(--muted);
  font-family: var(--sans);
  font-size: 0.72rem;
  line-height: 1.65;
}

.closing {
  position: relative;
  padding: clamp(3rem, 7vw, 5rem);
  border-top: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line-strong);
  background:
    linear-gradient(135deg, var(--purple-soft), transparent 48%),
    var(--deep);
  overflow: hidden;
}

.closing::after {
  position: absolute;
  right: -0.05em;
  bottom: -0.45em;
  color: rgba(245, 240, 230, 0.035);
  content: "ID";
  font-family: var(--mono);
  font-size: clamp(9rem, 24vw, 18rem);
  line-height: 1;
}

.closing > * {
  position: relative;
  z-index: 1;
}

.closing .micro-label {
  margin: 0 0 1.2rem;
  color: var(--purple);
}

.closing h2 {
  max-width: 12ch;
  margin: 0;
  font-size: clamp(2.5rem, 6vw, 5rem);
}

.closing p {
  max-width: 42rem;
  margin: 1.6rem 0 0;
  color: var(--soft-paper);
  font-size: 1.08rem;
  line-height: 1.85;
}

.site-footer {
  padding: 0 0 4rem;
}

.course-nav {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line-strong);
}

.course-nav a {
  min-height: 9rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 1.6rem 0;
  text-decoration: none;
}

.course-nav a + a {
  padding-left: 2rem;
  border-left: 1px solid var(--line);
}

.course-nav span {
  margin-bottom: 0.7rem;
  color: var(--muted);
  font-family: var(--sans);
  font-size: 0.65rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.course-nav strong {
  font-size: 1.15rem;
  font-weight: 400;
  transition: color 180ms ease;
}

.course-nav a:hover strong,
.course-nav a:focus-visible strong {
  color: var(--purple);
}

.footer-meta {
  display: flex;
  justify-content: space-between;
  gap: 2rem;
  padding-top: 2rem;
  color: var(--faint);
  font-family: var(--sans);
  font-size: 0.66rem;
  letter-spacing: 0.06em;
  line-height: 1.6;
}

.reveal-ready [data-reveal] {
  opacity: 0;
  transform: translateY(1.1rem);
  transition: opacity 650ms ease, transform 650ms ease;
}

.reveal-ready [data-reveal].is-visible {
  opacity: 1;
  transform: translateY(0);
}

.noscript-note {
  width: min(100% - (var(--gutter) * 2), var(--shell));
  margin: 1rem auto;
  padding: 1rem;
  border: 1px solid var(--line);
  color: var(--muted);
  font-family: var(--sans);
  font-size: 0.75rem;
  line-height: 1.6;
}

@media (max-width: 66.25rem) {
  .hero {
    min-height: auto;
    grid-template-columns: 1fr;
    gap: 4.5rem;
  }

  .hero-copy {
    max-width: 56rem;
  }

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

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

  .toc {
    position: static;
  }

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

  .toc li:nth-child(odd) {
    padding-right: 1.2rem;
    border-right: 1px solid var(--line);
  }

  .toc li:nth-child(even) {
    padding-left: 1.2rem;
  }

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

@media (max-width: 51.25rem) {
  .thesis {
    grid-template-columns: 1fr;
  }

  .thesis-item {
    min-height: auto;
    padding: 2rem 0;
  }

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

  .thesis-index {
    margin-bottom: 1rem;
  }

  .architecture-compare {
    grid-template-columns: 1fr;
  }

  .architecture-arrow {
    min-height: 4rem;
  }

  .architecture-arrow::before {
    content: "↓";
    font-size: 1.4rem;
  }

  .architecture-arrow span {
    display: none;
  }

  .receiver-flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .receiver-step:nth-child(2)::after {
    display: none;
  }

  .scope-diagram {
    grid-template-columns: 1fr;
  }

  .scope-arrow b {
    transform: rotate(90deg);
  }

  .recap-equation {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .recap-part::after {
    display: none;
  }

  .recap-part:last-child {
    grid-column: 1 / -1;
  }

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

@media (max-width: 43.75rem) {
  :root {
    --gutter: 1rem;
  }

  html {
    scroll-padding-top: 3.5rem;
  }

  .masthead {
    min-height: 4rem;
  }

  .brand {
    font-size: 0.78rem;
  }

  .course-mark {
    font-size: 0.58rem;
  }

  .hero {
    padding: 4.4rem 0 3.5rem;
  }

  h1 {
    font-size: clamp(3rem, 15vw, 4.7rem);
  }

  .hero-meta {
    display: grid;
    gap: 0.48rem;
  }

  .hero-meta li + li::before {
    display: none;
  }

  .vault-asset {
    grid-template-columns: 3.5rem 1fr;
  }

  .vault-asset small {
    grid-column: 2;
  }

  .content-grid {
    padding-top: 4.5rem;
  }

  .toc ol {
    grid-template-columns: 1fr;
  }

  .toc li:nth-child(odd),
  .toc li:nth-child(even) {
    padding-right: 0;
    padding-left: 0;
    border-right: 0;
  }

  .chapter {
    margin-bottom: 6.5rem;
  }

  .scenario-grid,
  .concept-grid,
  .audit-grid,
  .interface-surface,
  .glossary,
  .asset-detail,
  .receiver-outcome,
  .uri-lab-grid {
    grid-template-columns: 1fr;
  }

  .map-head {
    display: none;
  }

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

  .map-row .map-contract {
    grid-column: 1 / -1;
  }

  .ledger-diagram {
    overflow-x: auto;
  }

  .ledger-grid {
    min-width: 38rem;
  }

  .lab-head {
    display: block;
  }

  .lab-head > p {
    margin-top: 0.8rem;
  }

  .interface-id-table {
    grid-template-columns: 1fr;
  }

  .batch-controls,
  .batch-result {
    grid-template-columns: 1fr;
  }

  .batch-stage {
    grid-template-columns: 1fr;
  }

  .batch-route {
    min-height: 5rem;
  }

  .batch-route strong {
    transform: rotate(90deg);
  }

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

  .receiver-step::after {
    top: auto;
    right: 50%;
    bottom: -0.65rem;
    transform: translateX(50%) rotate(90deg);
  }

  .receiver-step:nth-child(2)::after {
    display: block;
  }

  .event-row {
    grid-template-columns: 1fr;
    gap: 0.45rem;
  }

  .recap-equation {
    grid-template-columns: 1fr;
  }

  .recap-part:last-child {
    grid-column: auto;
  }

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

  .course-nav a + a {
    padding-left: 0;
    border-top: 1px solid var(--line);
    border-left: 0;
  }

  .footer-meta {
    display: block;
  }

  .footer-meta p + p {
    margin-top: 0.75rem;
  }
}

@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;
  }
}

@media (forced-colors: active) {
  .status-dot::before,
  .token-chip::before,
  .balance-fill {
    background: CanvasText;
  }

  .vault-console,
  .lab,
  .closing,
  .precision-note,
  .warning-note,
  .protocol-note,
  .success-note,
  .scope-operator {
    background: Canvas;
  }

  .asset-button[aria-selected="true"],
  .receiver-button[aria-pressed="true"],
  .view-button[aria-pressed="true"],
  .quiz-option.is-correct,
  .quiz-option.is-wrong {
    outline: 2px solid Highlight;
    outline-offset: -2px;
  }
}

@media print {
  :root {
    --void: #fff;
    --deep: #fff;
    --panel: #fff;
    --panel-raised: #fff;
    --panel-bright: #fff;
    --paper: #111;
    --soft-paper: #222;
    --muted: #555;
    --faint: #777;
    --line: rgba(0, 0, 0, 0.18);
    --line-strong: rgba(0, 0, 0, 0.45);
    --purple: #4737a8;
    --cyan: #1f6f67;
    --amber: #7b5600;
    --danger: #8a2615;
    --success: #2c6637;
  }

  html,
  body {
    background: #fff;
  }

  body::before,
  .reading-progress,
  .skip-link,
  .sidebar,
  .copy-button,
  .asset-selector,
  .receiver-controls,
  .view-switch,
  .batch-controls,
  .quiz-options,
  .course-nav {
    display: none !important;
  }

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

  .hero {
    min-height: auto;
    grid-template-columns: 1fr 0.72fr;
    padding: 2rem 0;
  }

  .hero::after,
  .closing::after {
    display: none;
  }

  .content-grid {
    display: block;
    padding: 3rem 0;
  }

  .chapter,
  .chapter.wide-chapter {
    width: 100%;
    margin-bottom: 4rem;
    break-inside: auto;
  }

  .lab,
  .scenario-card,
  .concept-card,
  .audit-card,
  .surface-group,
  .ledger-cell,
  .map-row > span,
  .quiz-item,
  .term,
  .result-stat,
  .receiver-step,
  .receiver-contract,
  .receiver-status,
  .uri-input-panel,
  .uri-output-panel,
  .wallet-box,
  .receiver-box,
  pre {
    background: #fff !important;
  }

  .js .quiz-explanation {
    display: block;
  }

  a {
    text-decoration: none;
  }

  .site-footer {
    padding-bottom: 0;
  }
}