:root {
  color-scheme: dark;
  --void: #050505;
  --deep: #09090a;
  --panel: #0d0d0f;
  --panel-raised: #121215;
  --paper: #f5f0e6;
  --soft: #d8d3c9;
  --muted: #918a80;
  --faint: #696966;
  --line: rgba(245, 240, 230, .14);
  --line-strong: rgba(245, 240, 230, .36);
  --eth: #9f97ff;
  --eth-soft: rgba(159, 151, 255, .12);
  --eth-line: rgba(159, 151, 255, .52);
  --cyan: #9fd8d0;
  --cyan-soft: rgba(159, 216, 208, .1);
  --amber: #d8b783;
  --amber-soft: rgba(216, 183, 131, .1);
  --good: #b8d4bf;
  --good-soft: rgba(184, 212, 191, .1);
  --bad: #d99180;
  --bad-soft: rgba(217, 145, 128, .1);
  --display: "Songti SC", "STSong", "Noto Serif CJK SC", "Source Han Serif SC", serif;
  --body: "Songti SC", "STSong", "Noto Serif CJK SC", "Source Han Serif SC", serif;
  --ui: Inter, "Helvetica Neue", Helvetica, Arial, "PingFang SC", sans-serif;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  --shell: 82rem;
  --prose: 46rem;
  --wide: 64rem;
  --gutter: clamp(1.25rem, 5vw, 4rem);
  --section-gap: clamp(5.5rem, 11vw, 9rem);
  --fast: 180ms;
  --normal: 320ms;
  --ease: cubic-bezier(.2, .7, .2, 1);
}

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

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

body {
  min-height: 100dvh;
  margin: 0;
  overflow-x: clip;
  color: var(--paper);
  background:
    radial-gradient(ellipse 66% 28% at 72% 7%, rgba(159, 151, 255, .09), transparent 68%),
    radial-gradient(ellipse 52% 22% at 18% 34%, rgba(159, 216, 208, .035), transparent 72%),
    linear-gradient(rgba(245, 240, 230, .017) 1px, transparent 1px) 0 0 / 100% 12rem,
    var(--void);
  font-family: var(--body);
  font-size: clamp(1.04rem, 1.18vw, 1.13rem);
  line-height: 1.92;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body::before {
  position: fixed;
  inset: 0;
  z-index: -1;
  content: "";
  pointer-events: none;
  opacity: .18;
  background-image:
    radial-gradient(circle at 18% 27%, rgba(255, 255, 255, .11) 0 .5px, transparent .8px),
    radial-gradient(circle at 76% 69%, rgba(255, 255, 255, .07) 0 .5px, transparent .75px);
  background-size: 97px 89px, 149px 137px;
}

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

[hidden] {
  display: none !important;
}

a {
  color: inherit;
  text-decoration-color: var(--eth-line);
  text-decoration-thickness: 1px;
  text-underline-offset: .28em;
}

a:hover {
  text-decoration-color: currentColor;
}

button,
input {
  color: inherit;
  font: inherit;
}

button {
  cursor: pointer;
}

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

code,
.mono {
  font-family: var(--mono);
  font-size: .88em;
  overflow-wrap: anywhere;
}

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

.skip-link {
  position: fixed;
  top: .75rem;
  left: .75rem;
  z-index: 100;
  padding: .7rem 1rem;
  color: var(--void);
  background: var(--paper);
  font-family: var(--ui);
  font-size: .76rem;
  letter-spacing: .08em;
  text-decoration: none;
  transform: translateY(-180%);
  transition: transform var(--fast) ease;
}

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

.reading-progress {
  position: fixed;
  top: 0;
  right: 0;
  left: 0;
  z-index: 90;
  height: 2px;
  pointer-events: none;
}

.reading-progress span {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--eth), var(--cyan));
  transform-origin: 0 50%;
}

.site-header {
  position: relative;
  z-index: 10;
  width: min(100% - 2 * var(--gutter), var(--shell));
  min-height: 5.1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  margin: 0 auto;
  border-bottom: 1px solid var(--line);
  font-family: var(--ui);
}

.brand {
  flex: none;
  font-size: .88rem;
  font-weight: 500;
  letter-spacing: .36em;
  text-decoration: none;
}

.lesson-path {
  min-width: 0;
  margin: 0;
  color: var(--muted);
  font-size: .68rem;
  letter-spacing: .13em;
  line-height: 1.5;
  text-align: right;
  text-transform: uppercase;
}

.lesson-path strong {
  color: var(--soft);
  font-weight: 500;
}

.noscript-note {
  width: min(100% - 2 * var(--gutter), var(--shell));
  margin: 1rem auto;
  padding: .85rem 1rem;
  border: 1px solid var(--amber);
  color: var(--soft);
  background: var(--amber-soft);
  font-family: var(--ui);
  font-size: .76rem;
  line-height: 1.55;
}

.hero {
  position: relative;
  width: min(100% - 2 * var(--gutter), var(--shell));
  min-height: min(55rem, calc(100svh - 5.1rem));
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(22rem, .95fr);
  align-items: center;
  gap: clamp(3rem, 7vw, 7rem);
  margin: 0 auto;
  padding: clamp(5rem, 10vw, 8rem) 0;
}

.hero::after {
  position: absolute;
  bottom: 2rem;
  left: 0;
  width: 6rem;
  height: 1px;
  content: "";
  background: var(--line-strong);
}

.hero-copy {
  position: relative;
  z-index: 2;
}

.hero-kicker,
.section-index,
.micro-label,
.thesis-label,
.note-label {
  margin: 0;
  color: var(--eth);
  font-family: var(--ui);
  font-size: .7rem;
  font-weight: 600;
  letter-spacing: .2em;
  line-height: 1.5;
  text-transform: uppercase;
}

.hero h1 {
  max-width: 9.5em;
  margin: 1.25rem 0 1.8rem;
  font-family: var(--display);
  font-size: clamp(3.2rem, 7vw, 6.6rem);
  font-weight: 400;
  letter-spacing: -.07em;
  line-height: .98;
}

.hero h1 span {
  display: block;
  margin-top: 1.4rem;
  color: var(--cyan);
  font-family: var(--ui);
  font-size: clamp(.72rem, 1vw, .88rem);
  font-weight: 500;
  letter-spacing: .15em;
  line-height: 1.55;
}

.hero-deck {
  max-width: 35rem;
  margin: 0;
  color: var(--soft);
  font-size: clamp(1.08rem, 1.5vw, 1.28rem);
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: .75rem 1.4rem;
  margin-top: 2rem;
  font-family: var(--ui);
  font-size: .76rem;
  letter-spacing: .08em;
}

.hero-actions a {
  display: inline-flex;
  min-height: 2.8rem;
  align-items: center;
  padding: .65rem 0;
}

.hero-actions .primary-link {
  padding-inline: 1rem;
  border: 1px solid var(--eth-line);
  background: var(--eth-soft);
  text-decoration: none;
}

.lesson-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 2rem;
  margin: 3rem 0 0;
  padding: 1.35rem 0 0;
  border-top: 1px solid var(--line);
  list-style: none;
  color: var(--muted);
  font-family: var(--ui);
  font-size: .68rem;
  letter-spacing: .07em;
}

.lesson-facts strong {
  display: block;
  margin-bottom: .15rem;
  color: var(--paper);
  font-family: var(--mono);
  font-size: .72rem;
  font-weight: 500;
}

.hero-specimen {
  position: relative;
  min-height: 35rem;
  perspective: 1000px;
  isolation: isolate;
}

.hero-specimen::before {
  position: absolute;
  inset: 7% -8% 4%;
  z-index: -1;
  content: "";
  border: 1px solid var(--line);
  background:
    linear-gradient(90deg, transparent 49.8%, rgba(245, 240, 230, .05) 50%, transparent 50.2%),
    linear-gradient(transparent 49.8%, rgba(245, 240, 230, .05) 50%, transparent 50.2%);
  background-size: 3rem 3rem;
  transform: rotate(-2deg);
}

.specimen-axis {
  position: absolute;
  top: 3rem;
  bottom: 3rem;
  left: 50%;
  width: 1px;
  background: linear-gradient(transparent, var(--line-strong) 10%, var(--line-strong) 90%, transparent);
}

.hero-layer {
  position: absolute;
  right: 6%;
  left: 4%;
  min-height: 5rem;
  display: grid;
  grid-template-columns: 8.5rem 1fr;
  align-items: center;
  gap: 1rem;
  padding: 1rem 1.3rem;
  border: 1px solid;
  background: rgba(9, 9, 10, .94);
  box-shadow: 0 1.2rem 3rem rgba(0, 0, 0, .28);
  font-family: var(--ui);
  transform: rotateX(57deg) rotateZ(-4deg);
  transform-origin: 50% 50%;
}

.hero-layer b {
  font-size: .63rem;
  letter-spacing: .16em;
}

.hero-layer span {
  min-width: 0;
  font-family: var(--mono);
  font-size: .75rem;
  overflow-wrap: anywhere;
}

.hero-layer.type {
  top: 10%;
  border-color: rgba(216, 183, 131, .55);
  color: var(--amber);
}

.hero-layer.order {
  top: 26%;
  border-color: var(--eth-line);
  color: var(--eth);
}

.hero-layer.action {
  top: 42%;
  border-color: rgba(159, 216, 208, .55);
  color: var(--cyan);
}

.hero-layer.fee {
  top: 58%;
  border-color: rgba(159, 216, 208, .35);
  color: var(--soft);
}

.hero-layer.proof {
  top: 74%;
  border-color: var(--eth-line);
  color: var(--eth);
}

.derived-tag {
  position: absolute;
  z-index: 4;
  display: grid;
  gap: .12rem;
  padding: .65rem .8rem;
  border: 1px solid var(--line-strong);
  background: var(--void);
  font-family: var(--ui);
}

.derived-tag::before {
  position: absolute;
  top: 50%;
  right: 100%;
  width: 4rem;
  height: 1px;
  content: "";
  background: var(--line-strong);
}

.derived-tag small {
  color: var(--muted);
  font-size: .54rem;
  letter-spacing: .14em;
}

.derived-tag strong {
  font-family: var(--mono);
  font-size: .74rem;
  font-weight: 500;
}

.derived-tag.sender {
  top: 34%;
  right: -2%;
}

.derived-tag.hash {
  right: 2%;
  bottom: 1%;
}

.thesis {
  width: min(100% - 2 * var(--gutter), var(--shell));
  display: grid;
  grid-template-columns: 11rem 1fr;
  gap: 2rem;
  margin: 0 auto;
  padding: clamp(3rem, 7vw, 5.5rem) 0;
  border-top: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line);
}

.thesis p:last-child {
  max-width: 54rem;
  margin: 0;
  font-size: clamp(1.65rem, 3vw, 2.65rem);
  letter-spacing: -.035em;
  line-height: 1.52;
}

.thesis em {
  color: var(--eth);
}

.page-grid {
  width: min(100% - 2 * var(--gutter), var(--shell));
  display: grid;
  grid-template-columns: 14rem minmax(0, 1fr);
  gap: clamp(3rem, 7vw, 7rem);
  margin: 0 auto;
  padding-top: var(--section-gap);
}

.toc {
  position: sticky;
  top: 2rem;
  align-self: start;
  max-height: calc(100vh - 4rem);
  overflow: auto;
  padding-right: 1rem;
  scrollbar-width: thin;
  scrollbar-color: var(--line-strong) transparent;
}

.toc-title {
  margin: 0 0 1.25rem;
  color: var(--muted);
  font-family: var(--ui);
  font-size: .64rem;
  letter-spacing: .16em;
  text-transform: uppercase;
}

.toc ol {
  display: grid;
  gap: .05rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.toc a {
  display: grid;
  grid-template-columns: 1.8rem 1fr;
  gap: .5rem;
  padding: .52rem 0;
  border-left: 1px solid transparent;
  color: var(--muted);
  font-family: var(--ui);
  font-size: .69rem;
  letter-spacing: .03em;
  line-height: 1.5;
  text-decoration: none;
  transition: color var(--fast), border-color var(--fast), transform var(--fast);
}

.toc a span {
  color: var(--faint);
  font-family: var(--mono);
}

.toc a:hover,
.toc a[aria-current="true"] {
  color: var(--paper);
  border-left-color: var(--eth);
  transform: translateX(.35rem);
}

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

.lesson {
  min-width: 0;
}

.chapter {
  width: min(100%, var(--prose));
  margin-bottom: var(--section-gap);
  scroll-margin-top: 2rem;
}

.chapter:last-child {
  margin-bottom: 0;
}

.js-ready .chapter {
  opacity: 0;
  transform: translateY(1.25rem);
  transition: opacity .65s var(--ease), transform .65s var(--ease);
}

.js-ready .chapter.is-visible {
  opacity: 1;
  transform: none;
}

html:not(.js-ready) .chapter {
  opacity: 1;
  transform: none;
}

html:not(.js-ready) .sample-switcher,
html:not(.js-ready) .nonce-controls,
html:not(.js-ready) .fee-controls,
html:not(.js-ready) .type-tabs,
html:not(.js-ready) .quiz-options {
  display: none;
}

html:not(.js-ready) [data-field],
html:not(.js-ready) [data-calldata-part] {
  cursor: default;
  pointer-events: none;
}

.chapter-header {
  margin-bottom: 2.6rem;
}

.chapter-header h2 {
  margin: .85rem 0 .8rem;
  font-family: var(--display);
  font-size: clamp(2.2rem, 5vw, 4rem);
  font-weight: 400;
  letter-spacing: -.055em;
  line-height: 1.13;
}

.chapter-header h2 code {
  color: var(--eth);
  font-size: .72em;
}

.section-deck {
  max-width: 38rem;
  margin: 0;
  color: var(--muted);
  font-size: 1.03rem;
  line-height: 1.72;
}

.chapter > p {
  margin: 0 0 1.5rem;
}

.chapter > .lead {
  color: var(--soft);
  font-size: clamp(1.13rem, 1.55vw, 1.28rem);
  line-height: 1.9;
}

.chapter > h3 {
  margin: 3.6rem 0 1.25rem;
  font-family: var(--display);
  font-size: clamp(1.55rem, 2.7vw, 2.2rem);
  font-weight: 400;
  letter-spacing: -.035em;
  line-height: 1.3;
}

sup a {
  color: var(--eth);
  font-family: var(--ui);
  font-size: .7rem;
  text-decoration: none;
}

.wide {
  width: min(var(--wide), calc(100vw - 2 * var(--gutter) - 14rem - clamp(3rem, 7vw, 7rem)));
  max-width: none;
}

.scope-badge {
  display: inline-flex;
  margin: 0 0 1.5rem !important;
  padding: .45rem .65rem;
  border: 1px solid var(--eth-line);
  color: var(--eth);
  background: var(--eth-soft);
  font-family: var(--ui);
  font-size: .64rem;
  letter-spacing: .08em;
  line-height: 1.4;
}

.definition,
.precision,
.warning,
.takeaway {
  position: relative;
  margin: 2.4rem 0;
  padding: 1.6rem 1.7rem 1.5rem;
  border-top: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line);
  background: linear-gradient(90deg, rgba(245, 240, 230, .025), transparent);
}

.definition::before,
.precision::before,
.warning::before,
.takeaway::before {
  position: absolute;
  top: -1px;
  left: 0;
  width: 5rem;
  height: 1px;
  content: "";
  background: var(--eth);
}

.warning::before {
  background: var(--amber);
}

.takeaway::before {
  background: var(--cyan);
}

.definition p,
.precision p,
.warning p,
.takeaway p {
  margin: .7rem 0 0;
  color: var(--soft);
  line-height: 1.8;
}

.warning .note-label {
  color: var(--amber);
}

.takeaway .note-label {
  color: var(--cyan);
}

.four-layer-map {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr) 1.5rem) minmax(0, 1fr);
  align-items: stretch;
  gap: .7rem;
  margin: 2.5rem 0;
}

.four-layer-map article {
  position: relative;
  min-height: 13.5rem;
  display: flex;
  flex-direction: column;
  padding: 1.25rem 1.1rem;
  border: 1px solid var(--line);
  background: var(--panel);
}

.four-layer-map article::before {
  width: 2.5rem;
  height: 2px;
  margin-bottom: 1.1rem;
  content: "";
  background: var(--eth);
}

.four-layer-map article:nth-of-type(2)::before,
.four-layer-map article:nth-of-type(4)::before {
  background: var(--cyan);
}

.four-layer-map article > span,
.provenance-grid article > b,
.not-fields article > span,
.rule-grid article > span,
.learning-grid article > span,
.fee-model article > span,
.compare-grid article > span,
.provenance-board article > span {
  color: var(--muted);
  font-family: var(--ui);
  font-size: .58rem;
  font-weight: 600;
  letter-spacing: .12em;
}

.four-layer-map h3 {
  margin: .55rem 0 .75rem;
  font-family: var(--display);
  font-size: 1.3rem;
  font-weight: 400;
}

.four-layer-map p {
  margin: 0;
  color: var(--soft);
  font-size: .84rem;
  line-height: 1.65;
}

.four-layer-map small {
  margin-top: auto;
  padding-top: .75rem;
  color: var(--faint);
  font-family: var(--ui);
  font-size: .62rem;
}

.four-layer-map > i {
  align-self: center;
  color: var(--line-strong);
  font-family: var(--ui);
  font-style: normal;
  text-align: center;
}

.provenance-grid,
.not-fields,
.rule-grid,
.learning-grid,
.callout-grid,
.compare-grid,
.boundary-cards,
.advanced-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);
}

.provenance-grid article,
.not-fields article,
.rule-grid article,
.learning-grid article,
.compare-grid article,
.boundary-cards article {
  min-width: 0;
  padding: 1.45rem;
  background: var(--panel);
}

.provenance-grid h4,
.not-fields h3,
.rule-grid h3,
.learning-grid h3,
.compare-grid h3,
.boundary-cards h3 {
  margin: .5rem 0 .6rem;
  font-family: var(--display);
  font-size: 1.25rem;
  font-weight: 400;
  letter-spacing: -.02em;
}

.provenance-grid p,
.not-fields p,
.rule-grid p,
.learning-grid p,
.compare-grid p,
.boundary-cards p {
  margin: 0;
  color: var(--muted);
  font-size: .88rem;
  line-height: 1.7;
}

.provenance-grid article:nth-child(2n) b,
.not-fields article:nth-child(2n) > span,
.learning-grid article:nth-child(2n) > span {
  color: var(--cyan);
}

.transaction-lab {
  margin: 2.6rem 0;
  border: 1px solid var(--line-strong);
  background:
    linear-gradient(135deg, var(--eth-soft), transparent 32%),
    var(--deep);
}

.lab-toolbar {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1.5rem;
  padding: 1.4rem;
  border-bottom: 1px solid var(--line);
}

.lab-toolbar h3,
.calldata-head h3 {
  margin: .35rem 0 0;
  font-family: var(--display);
  font-size: 1.45rem;
  font-weight: 400;
}

.sample-switcher,
.nonce-controls,
.type-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: .45rem;
}

.sample-switcher button,
.nonce-controls button,
.type-tabs button {
  min-height: 2.35rem;
  padding: .52rem .7rem;
  border: 1px solid var(--line);
  color: var(--muted);
  background: transparent;
  font-family: var(--ui);
  font-size: .65rem;
  letter-spacing: .03em;
  transition: color var(--fast), border-color var(--fast), background var(--fast);
}

.sample-switcher button:hover,
.sample-switcher button[aria-pressed="true"],
.nonce-controls button:hover,
.nonce-controls button[aria-pressed="true"],
.type-tabs button:hover,
.type-tabs button[aria-pressed="true"] {
  border-color: var(--eth-line);
  color: var(--paper);
  background: var(--eth-soft);
}

.lab-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.12fr) minmax(18rem, .88fr);
  min-height: 39rem;
}

.transaction-card {
  min-width: 0;
  padding: clamp(1.2rem, 3vw, 2rem);
  border-right: 1px solid var(--line);
}

.tx-card-head {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: .35rem 1rem;
  align-items: baseline;
  margin-bottom: 1.2rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--line);
}

.tx-card-head > span {
  grid-row: span 2;
  align-self: stretch;
  display: grid;
  place-items: center;
  padding: .5rem .65rem;
  border: 1px solid var(--eth-line);
  color: var(--eth);
  font-family: var(--mono);
  font-size: .68rem;
}

.tx-card-head strong {
  font-family: var(--mono);
  font-size: .82rem;
  font-weight: 500;
}

.tx-card-head small {
  color: var(--muted);
  font-size: .7rem;
  line-height: 1.5;
}

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

.field-stack > div {
  min-width: 0;
  display: grid;
  grid-template-columns: minmax(10rem, .95fr) minmax(0, 1.3fr);
  align-items: center;
  background: var(--panel);
}

.field-stack dt,
.field-stack dd {
  min-width: 0;
  margin: 0;
}

.field-stack button {
  width: 100%;
  min-height: 2.55rem;
  padding: .52rem .7rem;
  border: 0;
  border-right: 1px solid var(--line);
  color: var(--muted);
  background: transparent;
  font-family: var(--mono);
  font-size: .66rem;
  text-align: left;
  overflow-wrap: anywhere;
  transition: color var(--fast), background var(--fast);
}

.field-stack button:hover,
.field-stack button[aria-pressed="true"] {
  color: var(--paper);
  background: var(--eth-soft);
}

.field-stack button[aria-pressed="true"]::before {
  display: inline-block;
  width: .35rem;
  height: .35rem;
  margin-right: .55rem;
  content: "";
  background: var(--eth);
}

.field-stack dd {
  padding: .5rem .7rem;
  color: var(--soft);
  font-family: var(--mono);
  font-size: .67rem;
  line-height: 1.5;
  overflow-wrap: anywhere;
}

.field-stack .signature-row {
  background: linear-gradient(90deg, var(--eth-soft), var(--panel));
}

.field-stack .is-optional {
  background: linear-gradient(90deg, var(--cyan-soft), var(--panel));
}

.field-inspector {
  min-width: 0;
  padding: clamp(1.5rem, 4vw, 2.5rem);
  background:
    linear-gradient(rgba(245, 240, 230, .025) 1px, transparent 1px) 0 0 / 100% 3.5rem,
    rgba(5, 5, 5, .48);
}

.field-inspector h3 {
  margin: .75rem 0 1rem;
  font-family: var(--display);
  font-size: clamp(1.45rem, 2.6vw, 2rem);
  font-weight: 400;
  line-height: 1.35;
}

.field-inspector > p:not(.micro-label) {
  margin: 0;
  color: var(--soft);
  font-size: .92rem;
  line-height: 1.78;
}

.inspector-facts {
  margin: 2rem 0 0;
}

.inspector-facts div {
  padding: .85rem 0;
  border-top: 1px solid var(--line);
}

.inspector-facts dt {
  color: var(--muted);
  font-family: var(--ui);
  font-size: .6rem;
  letter-spacing: .12em;
}

.inspector-facts dd {
  margin: .3rem 0 0;
  color: var(--soft);
  font-size: .79rem;
  line-height: 1.6;
}

.lab-summary {
  display: grid;
  grid-template-columns: 12rem 1fr;
  gap: 1rem;
  padding: 1.15rem 1.4rem;
  border-top: 1px solid var(--line);
  background: var(--eth-soft);
}

.lab-summary span {
  color: var(--eth);
  font-family: var(--ui);
  font-size: .62rem;
  letter-spacing: .08em;
}

.lab-summary strong {
  font-size: .85rem;
  font-weight: 400;
  line-height: 1.6;
}

.not-fields {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.not-fields article > span {
  color: var(--amber);
}

.nonce-lab {
  margin: 2.5rem 0;
  border: 1px solid var(--line-strong);
  background: var(--deep);
}

.nonce-controls {
  padding: 1rem;
  border-bottom: 1px solid var(--line);
}

.nonce-state {
  padding: clamp(1.3rem, 4vw, 2.4rem);
}

.account-counter {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--line);
  font-family: var(--ui);
}

.account-counter > span {
  color: var(--muted);
  font-size: .62rem;
  letter-spacing: .14em;
}

.account-counter strong {
  font-family: var(--mono);
  font-size: .88rem;
  font-weight: 400;
}

.account-counter b {
  color: var(--eth);
  font-weight: 500;
}

.nonce-queue {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: .6rem;
}

.nonce-slot {
  min-height: 7.5rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: .8rem;
  border: 1px solid var(--line);
  color: var(--faint);
  background: var(--panel);
  transition: color var(--normal), border-color var(--normal), background var(--normal), transform var(--normal);
}

.nonce-slot span {
  font-family: var(--mono);
  font-size: 1.25rem;
}

.nonce-slot small {
  font-family: var(--ui);
  font-size: .6rem;
}

.nonce-slot.is-used {
  border-color: rgba(184, 212, 191, .22);
  color: var(--good);
  background: var(--good-soft);
}

.nonce-slot.is-current {
  border-color: var(--eth);
  color: var(--paper);
  background: var(--eth-soft);
  transform: translateY(-.35rem);
}

.nonce-slot.is-waiting {
  border-color: var(--amber);
  color: var(--amber);
  background: var(--amber-soft);
}

.nonce-slot.is-replaced {
  border-style: dashed;
  border-color: var(--cyan);
  color: var(--cyan);
  background: var(--cyan-soft);
}

.nonce-slot.is-reverted {
  border-color: var(--bad);
  color: var(--bad);
  background: var(--bad-soft);
}

.nonce-result {
  margin: 1.5rem 0 0;
  padding-top: 1.1rem;
  border-top: 1px solid var(--line);
  color: var(--soft);
  font-size: .88rem;
  line-height: 1.75;
}

.rule-grid article > span {
  color: var(--eth);
  font-family: var(--mono);
}

.data-table {
  margin: 1.8rem 0 2.5rem;
  border-collapse: collapse;
  font-size: .82rem;
  line-height: 1.65;
}

.data-table caption {
  padding: 0 0 .8rem;
  color: var(--muted);
  font-family: var(--ui);
  font-size: .64rem;
  letter-spacing: .1em;
  text-align: left;
  text-transform: uppercase;
}

.data-table th,
.data-table td {
  padding: .9rem .85rem;
  border: 1px solid var(--line);
  vertical-align: top;
  text-align: left;
}

.data-table thead th {
  color: var(--muted);
  background: var(--deep);
  font-family: var(--ui);
  font-size: .62rem;
  font-weight: 500;
  letter-spacing: .06em;
}

.data-table tbody th {
  color: var(--paper);
  background: rgba(245, 240, 230, .018);
  font-weight: 400;
}

.data-table td {
  color: var(--muted);
}

.data-table .accent-cell {
  color: var(--eth);
}

.data-table .is-current > * {
  background: var(--eth-soft);
}

.route-diagram {
  display: grid;
  grid-template-columns: 14rem 1fr;
  gap: 2rem;
  align-items: center;
  margin: 2.4rem 0;
  padding: clamp(1.3rem, 4vw, 2.2rem);
  border: 1px solid var(--line-strong);
  background: var(--deep);
}

.route-origin {
  position: relative;
  display: grid;
  gap: .4rem;
  padding: 1rem;
  border: 1px solid var(--eth-line);
  background: var(--eth-soft);
  font-family: var(--ui);
}

.route-origin span {
  color: var(--eth);
  font-size: .6rem;
  letter-spacing: .12em;
}

.route-origin strong {
  font-family: var(--mono);
  font-size: .8rem;
  font-weight: 400;
}

.route-lines {
  display: grid;
  gap: .7rem;
}

.route-lines article {
  min-width: 0;
  display: grid;
  grid-template-columns: 2rem 1fr;
  align-items: center;
  gap: .7rem;
}

.route-lines i {
  color: var(--cyan);
  font-family: var(--ui);
  font-style: normal;
}

.route-lines div {
  min-width: 0;
  display: grid;
  gap: .2rem;
  padding: .8rem 1rem;
  border: 1px solid var(--line);
  background: var(--panel);
}

.route-lines b {
  font-family: var(--mono);
  font-size: .76rem;
  font-weight: 500;
}

.route-lines span {
  color: var(--muted);
  font-size: .72rem;
}

.callout-grid {
  background: transparent;
  border: 0;
  gap: 1rem;
}

.callout-grid > * {
  margin: 0;
}

.calldata-lab {
  margin: 2.5rem 0;
  border: 1px solid var(--line-strong);
  background: var(--deep);
}

.calldata-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.3rem;
  border-bottom: 1px solid var(--line);
}

.calldata-head > span {
  color: var(--muted);
  font-family: var(--ui);
  font-size: .62rem;
}

.byte-ruler {
  display: grid;
  grid-template-columns: 4fr 32fr 32fr 0fr;
  gap: 1px;
  padding: .8rem 1.3rem .4rem;
  color: var(--faint);
  font-family: var(--mono);
  font-size: .54rem;
}

.byte-ruler span:last-child {
  text-align: right;
}

.calldata-bytes {
  display: grid;
  grid-template-columns: 4fr 32fr 32fr;
  gap: 2px;
  padding: 0 1.3rem 1rem;
}

.byte-segment {
  min-width: 0;
  min-height: 9rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: .85rem;
  border: 1px solid var(--line);
  background: var(--panel);
  text-align: left;
  transition: border-color var(--fast), color var(--fast), transform var(--fast);
}

.byte-segment:hover,
.byte-segment.is-active {
  border-color: var(--eth);
  transform: translateY(-.2rem);
}

.byte-segment.selector {
  color: var(--amber);
}

.byte-segment.address {
  color: var(--eth);
}

.byte-segment.amount {
  color: var(--cyan);
}

.byte-segment small {
  font-family: var(--ui);
  font-size: .56rem;
  letter-spacing: .06em;
}

.byte-segment code {
  display: block;
  font-size: .58rem;
  line-height: 1.55;
  word-break: break-all;
}

.decode-panel {
  min-height: 9rem;
  display: grid;
  grid-template-columns: 10rem 1fr;
  gap: .35rem 1.2rem;
  align-items: start;
  padding: 1.3rem;
  border-top: 1px solid var(--line);
  background: linear-gradient(90deg, var(--eth-soft), transparent);
}

.decode-panel > p:first-child {
  grid-column: 1;
  margin: 0;
  color: var(--eth);
  font-family: var(--ui);
  font-size: .6rem;
  letter-spacing: .12em;
}

.decode-panel strong {
  grid-column: 1;
  font-weight: 400;
}

.decode-panel > p:last-child {
  grid-row: 1 / span 2;
  grid-column: 2;
  margin: 0;
  color: var(--soft);
  font-size: .82rem;
  line-height: 1.72;
}

.gas-vessel {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(15rem, .7fr);
  gap: 2rem;
  align-items: center;
  margin: 2.5rem 0;
  padding: clamp(1.3rem, 4vw, 2.3rem);
  border: 1px solid var(--line-strong);
  background: var(--deep);
}

.vessel-scale {
  position: relative;
  height: 13rem;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  border: 1px solid var(--line-strong);
  background:
    repeating-linear-gradient(to top, transparent 0 calc(25% - 1px), var(--line) calc(25% - 1px) 25%),
    var(--panel);
  overflow: hidden;
}

.vessel-scale > span {
  position: absolute;
  top: .65rem;
  right: .7rem;
  z-index: 2;
  color: var(--muted);
  font-family: var(--mono);
  font-size: .62rem;
}

.vessel-fill {
  height: var(--fill);
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  padding: .8rem 1rem;
  color: var(--void);
  background: linear-gradient(135deg, var(--eth), var(--cyan));
}

.vessel-fill strong {
  font-family: var(--mono);
  font-size: 1.8rem;
  font-weight: 500;
  line-height: 1;
}

.vessel-fill small {
  margin-top: .3rem;
  font-family: var(--ui);
  font-size: .58rem;
  letter-spacing: .1em;
}

.vessel-legend {
  display: grid;
  gap: 1rem;
}

.vessel-legend p {
  display: grid;
  grid-template-columns: .7rem 1fr;
  gap: .2rem .7rem;
  margin: 0;
}

.vessel-legend i {
  grid-row: span 2;
  width: .7rem;
  height: .7rem;
  margin-top: .35rem;
  background: var(--eth);
}

.vessel-legend i.unused {
  border: 1px solid var(--line-strong);
  background: transparent;
}

.vessel-legend strong {
  font-size: .83rem;
  font-weight: 400;
}

.vessel-legend span {
  color: var(--muted);
  font-size: .7rem;
  line-height: 1.5;
}

.equation {
  display: grid;
  grid-template-columns: 8rem 1fr;
  gap: .2rem 1rem;
  margin: 2rem 0;
  padding: 1.2rem 1.4rem;
  border-left: 2px solid var(--cyan);
  background: var(--cyan-soft);
}

.equation > span {
  align-self: center;
  color: var(--cyan);
  font-family: var(--ui);
  font-size: .64rem;
  letter-spacing: .12em;
}

.equation p {
  margin: 0;
  font-family: var(--mono);
  font-size: clamp(1rem, 2vw, 1.35rem);
}

.equation small {
  grid-column: 2;
  color: var(--muted);
  line-height: 1.6;
}

.fee-model {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr) 2rem) minmax(0, 1fr);
  align-items: stretch;
  gap: .6rem;
  margin: 2.4rem 0;
}

.fee-model article {
  padding: 1.3rem;
  border: 1px solid var(--line);
  background: var(--panel);
}

.fee-model article:first-child {
  border-color: var(--eth-line);
  background: var(--eth-soft);
}

.fee-model article:last-child {
  border-color: rgba(159, 216, 208, .35);
  background: var(--cyan-soft);
}

.fee-model article h3 {
  margin: .6rem 0 .7rem;
  font-family: var(--mono);
  font-size: .88rem;
  font-weight: 500;
  overflow-wrap: anywhere;
}

.fee-model article p {
  margin: 0;
  color: var(--muted);
  font-size: .76rem;
  line-height: 1.62;
}

.fee-model > b {
  align-self: center;
  color: var(--faint);
  font-family: var(--ui);
  font-weight: 400;
  text-align: center;
}

.formula-card {
  margin: 2rem 0;
  padding: 1.35rem 1.5rem;
  border: 1px solid var(--eth-line);
  background: var(--eth-soft);
}

.formula-card > p:not(.micro-label) {
  margin: .65rem 0 0;
  color: var(--soft);
  line-height: 1.65;
}

.formula-card small {
  display: block;
  margin-top: .8rem;
  color: var(--muted);
  line-height: 1.65;
}

.wrap-code {
  overflow-wrap: anywhere;
}

.fee-lab {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(18rem, .85fr);
  margin: 2.5rem 0;
  border: 1px solid var(--line-strong);
  background: var(--deep);
}

.fee-controls {
  display: grid;
  gap: 1.25rem;
  padding: clamp(1.3rem, 4vw, 2rem);
  border-right: 1px solid var(--line);
}

.range-control {
  display: grid;
  gap: .65rem;
}

.range-control label {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  color: var(--soft);
  font-family: var(--ui);
  font-size: .72rem;
}

.range-control output {
  color: var(--eth);
  font-family: var(--mono);
  font-size: .68rem;
}

.range-control input {
  width: 100%;
  height: 1rem;
  margin: 0;
  accent-color: var(--eth);
}

.fee-readout {
  padding: clamp(1.3rem, 4vw, 2rem);
  background: linear-gradient(145deg, var(--eth-soft), transparent 58%);
}

.fee-readout > div {
  display: grid;
  gap: .2rem;
  padding: .9rem 0;
  border-bottom: 1px solid var(--line);
}

.fee-readout span {
  color: var(--muted);
  font-family: var(--ui);
  font-size: .62rem;
}

.fee-readout strong {
  font-family: var(--mono);
  font-size: 1rem;
  font-weight: 500;
}

.fee-status {
  margin: 1rem 0 0;
  padding: .75rem;
  border-left: 2px solid var(--good);
  color: var(--good);
  background: var(--good-soft);
  font-size: .72rem;
  line-height: 1.6;
}

.fee-status.is-ineligible {
  border-color: var(--bad);
  color: var(--bad);
  background: var(--bad-soft);
}

.signing-pipeline {
  position: relative;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr) 1.2rem) minmax(0, 1fr);
  align-items: stretch;
  gap: .5rem;
  margin: 2.5rem 0 8.5rem;
}

.signing-pipeline > article {
  min-height: 11rem;
  display: flex;
  flex-direction: column;
  padding: 1rem;
  border: 1px solid var(--line);
  background: var(--panel);
}

.signing-pipeline > article span {
  color: var(--eth);
  font-family: var(--mono);
  font-size: .65rem;
}

.signing-pipeline > article b {
  margin-top: auto;
  font-family: var(--ui);
  font-size: .62rem;
  font-weight: 600;
  letter-spacing: .1em;
}

.signing-pipeline > article p {
  margin: .5rem 0 0;
  color: var(--muted);
  font-family: var(--mono);
  font-size: .63rem;
  line-height: 1.6;
}

.signing-pipeline > i {
  align-self: center;
  color: var(--line-strong);
  font-family: var(--ui);
  font-style: normal;
  text-align: center;
}

.pipeline-branch {
  position: absolute;
  bottom: -6.1rem;
  min-width: 13rem;
  display: grid;
  gap: .2rem;
  padding: .8rem 1rem;
  border: 1px solid var(--line);
  background: var(--deep);
}

.pipeline-branch::before {
  position: absolute;
  bottom: 100%;
  left: 2rem;
  width: 1px;
  height: 2.2rem;
  content: "";
  background: var(--line-strong);
}

.pipeline-branch span {
  color: var(--muted);
  font-family: var(--mono);
  font-size: .58rem;
}

.pipeline-branch strong {
  font-family: var(--mono);
  font-size: .74rem;
  font-weight: 500;
}

.hash-branch {
  right: 0;
  border-color: var(--cyan);
}

.from-branch {
  right: 25%;
  border-color: var(--eth);
}

.field-truth {
  margin: 2rem 0;
  border: 1px solid var(--line);
}

.field-truth > div {
  display: grid;
  grid-template-columns: 1fr 10rem 1.6fr;
  gap: 1rem;
  align-items: center;
  padding: .8rem 1rem;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
  font-size: .78rem;
}

.field-truth > div:last-child {
  border-bottom: 0;
}

.field-truth .truth-head {
  color: var(--muted);
  background: var(--deep);
  font-family: var(--ui);
  font-size: .6rem;
  letter-spacing: .07em;
}

.field-truth b {
  font-family: var(--ui);
  font-size: .64rem;
  font-weight: 500;
}

.field-truth b.yes {
  color: var(--good);
}

.field-truth b.no {
  color: var(--amber);
}

.type-switcher {
  margin: 2.5rem 0;
  border: 1px solid var(--line-strong);
  background: var(--deep);
}

.type-tabs {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0;
  border-bottom: 1px solid var(--line);
}

.type-tabs button {
  min-height: 4.5rem;
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: center;
  gap: .55rem;
  border: 0;
  border-right: 1px solid var(--line);
  text-align: left;
}

.type-tabs button:last-child {
  border-right: 0;
}

.type-tabs button b {
  font-family: var(--mono);
  font-size: 1.2rem;
  font-weight: 400;
}

.type-tabs button span {
  font-size: .58rem;
  line-height: 1.35;
}

.type-detail {
  display: grid;
  grid-template-columns: minmax(15rem, .8fr) minmax(0, 1.2fr);
  gap: 1.5rem 2rem;
  padding: clamp(1.3rem, 4vw, 2.2rem);
}

.type-detail h3 {
  margin: .5rem 0 .7rem;
  font-family: var(--display);
  font-size: 1.6rem;
  font-weight: 400;
}

.type-detail div > p:last-child {
  margin: 0;
  color: var(--muted);
  font-size: .84rem;
  line-height: 1.7;
}

.type-detail > code {
  align-self: center;
  display: block;
  padding: 1rem;
  border-left: 2px solid var(--eth);
  color: var(--soft);
  background: var(--panel);
  font-size: .65rem;
  line-height: 1.7;
}

.type-detail ul {
  grid-column: 1 / -1;
  display: flex;
  flex-wrap: wrap;
  gap: .55rem 1.5rem;
  margin: 0;
  padding: 1rem 0 0;
  border-top: 1px solid var(--line);
  list-style: none;
  color: var(--muted);
  font-size: .72rem;
}

.type-detail li::before {
  margin-right: .45rem;
  color: var(--cyan);
  content: "·";
}

.advanced-grid {
  gap: 1rem;
  border: 0;
  background: transparent;
}

.advanced-card {
  min-width: 0;
  padding: 1.5rem;
  border: 1px solid var(--line);
  background: var(--panel);
}

.advanced-card h3 {
  margin: .55rem 0 1rem;
  font-family: var(--display);
  font-size: 1.4rem;
  font-weight: 400;
  line-height: 1.4;
}

.advanced-card > p:last-child {
  margin: 1.1rem 0 0;
  color: var(--muted);
  font-size: .78rem;
  line-height: 1.7;
}

.sidecar-map,
.dual-sign-map {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr;
  align-items: center;
  gap: .5rem;
  margin: 1rem 0;
}

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

.sidecar-map > div,
.dual-sign-map > div {
  min-width: 0;
  padding: .75rem;
  border: 1px solid var(--line);
  background: var(--deep);
}

.sidecar-map b,
.dual-sign-map b {
  display: block;
  color: var(--eth);
  font-family: var(--ui);
  font-size: .54rem;
  letter-spacing: .08em;
}

.sidecar-map span,
.dual-sign-map span {
  display: block;
  margin-top: .35rem;
  color: var(--muted);
  font-family: var(--mono);
  font-size: .55rem;
  line-height: 1.5;
}

.sidecar-map i,
.dual-sign-map i {
  color: var(--line-strong);
  font-family: var(--ui);
  font-style: normal;
  text-align: center;
}

.provenance-board {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin: 2.5rem 0;
  border: 1px solid var(--line);
  background: var(--line);
}

.provenance-board article {
  padding: 1.4rem;
  background: var(--panel);
}

.provenance-board article:nth-child(1) {
  background: linear-gradient(145deg, var(--eth-soft), var(--panel) 60%);
}

.provenance-board article:nth-child(2) {
  background: linear-gradient(145deg, var(--cyan-soft), var(--panel) 60%);
}

.provenance-board h3 {
  margin: .6rem 0 .9rem;
  font-family: var(--display);
  font-size: 1.35rem;
  font-weight: 400;
}

.provenance-board ul {
  display: grid;
  gap: .3rem;
  margin: 0;
  padding: 0;
  list-style: none;
  color: var(--muted);
  font-family: var(--mono);
  font-size: .66rem;
}

.provenance-board li::before {
  margin-right: .4rem;
  color: var(--eth);
  content: "—";
}

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

.boundary-cards .micro-label {
  color: var(--cyan);
}

.final-model {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr) 1rem) minmax(0, 1fr);
  align-items: stretch;
  gap: .5rem;
  margin: 2.5rem 0 4rem;
}

.final-model > div {
  min-width: 0;
  min-height: 9.5rem;
  display: flex;
  flex-direction: column;
  padding: .9rem;
  border: 1px solid var(--line);
  background: var(--panel);
}

.final-model > div span {
  color: var(--eth);
  font-family: var(--ui);
  font-size: .58rem;
  letter-spacing: .1em;
}

.final-model > div b {
  margin-top: auto;
  font-family: var(--mono);
  font-size: .72rem;
  font-weight: 500;
  overflow-wrap: anywhere;
}

.final-model > div small {
  margin-top: .5rem;
  color: var(--muted);
  font-size: .61rem;
  line-height: 1.45;
}

.final-model > i {
  align-self: center;
  color: var(--line-strong);
  font-style: normal;
}

.model-result {
  grid-column: 1 / -1;
  padding: .9rem;
  border: 1px solid var(--eth-line);
  color: var(--eth);
  background: var(--eth-soft);
  font-family: var(--ui);
  font-size: .65rem;
  font-weight: 500;
  letter-spacing: .12em;
  text-align: center;
}

.checklist {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 1.8rem 0 3rem;
  padding: 1px;
  background: var(--line);
  list-style: none;
}

.checklist li {
  display: grid;
  grid-template-columns: 2.1rem 1fr;
  gap: .7rem;
  padding: 1.2rem;
  background: var(--panel);
}

.checklist li > span {
  color: var(--eth);
  font-family: var(--mono);
  font-size: .66rem;
}

.checklist p {
  margin: 0;
  color: var(--muted);
  font-size: .82rem;
  line-height: 1.7;
}

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

.quiz {
  margin: 3rem 0;
  border: 1px solid var(--line-strong);
  background: var(--deep);
}

.quiz-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.4rem;
  border-bottom: 1px solid var(--line);
}

.quiz-head h3 {
  margin: .45rem 0 0;
  font-family: var(--display);
  font-size: 1.55rem;
  font-weight: 400;
}

.quiz-head > p {
  margin: 0;
  color: var(--muted);
  font-family: var(--mono);
  font-size: .68rem;
}

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

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

.quiz-item h4 {
  margin: 0 0 1rem;
  font-size: .93rem;
  font-weight: 400;
  line-height: 1.6;
}

.quiz-options {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: .55rem;
}

.quiz-options button {
  min-height: 3.2rem;
  padding: .7rem;
  border: 1px solid var(--line);
  color: var(--muted);
  background: var(--panel);
  font-family: var(--ui);
  font-size: .7rem;
  line-height: 1.45;
  text-align: left;
  transition: color var(--fast), border-color var(--fast), background var(--fast);
}

.quiz-options button:hover,
.quiz-options button[aria-pressed="true"] {
  border-color: var(--eth-line);
  color: var(--paper);
  background: var(--eth-soft);
}

.quiz-options button.is-correct {
  border-color: var(--good);
  color: var(--good);
  background: var(--good-soft);
}

.quiz-options button.is-wrong {
  border-color: var(--bad);
  color: var(--bad);
  background: var(--bad-soft);
}

.quiz-feedback {
  min-height: 1.5rem;
  margin: .8rem 0 0;
  color: var(--muted);
  font-size: .74rem;
  line-height: 1.55;
}

.glossary {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 2rem 0 4rem;
  background: var(--line);
  border: 1px solid var(--line);
}

.glossary details {
  padding: 1.1rem;
  background: var(--panel);
}

.glossary summary {
  color: var(--paper);
  font-family: var(--mono);
  font-size: .78rem;
  cursor: pointer;
}

.glossary summary span {
  margin-left: .45rem;
  color: var(--muted);
  font-family: var(--body);
  font-size: .85rem;
}

.glossary p {
  margin: .8rem 0 0;
  color: var(--muted);
  font-size: .78rem;
  line-height: 1.65;
}

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

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

.source-item > span {
  color: var(--eth);
  font-family: var(--mono);
  font-size: .68rem;
}

.source-item a {
  font-family: var(--ui);
  font-size: .76rem;
}

.source-item p {
  margin: .3rem 0 0;
  color: var(--muted);
  font-size: .74rem;
  line-height: 1.55;
}

.course-close {
  width: min(100% - 2 * var(--gutter), var(--shell));
  margin: var(--section-gap) auto 0;
  padding: clamp(4rem, 10vw, 8rem) 0;
  border-top: 1px solid var(--line-strong);
  text-align: center;
}

.course-close > p:nth-child(2) {
  max-width: 18em;
  margin: 1rem auto 1.5rem;
  font-family: var(--display);
  font-size: clamp(1.9rem, 4vw, 3.4rem);
  letter-spacing: -.05em;
  line-height: 1.45;
}

.course-close > a {
  font-family: var(--ui);
  font-size: .7rem;
  letter-spacing: .08em;
}

.site-footer {
  width: min(100% - 2 * var(--gutter), var(--shell));
  min-height: 6rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  margin: 0 auto;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-family: var(--ui);
  font-size: .65rem;
  line-height: 1.5;
}

.site-footer a {
  color: var(--soft);
  text-decoration: none;
}

@media (max-width: 68rem) {
  .hero {
    grid-template-columns: 1fr;
  }

  .hero-copy {
    max-width: 47rem;
  }

  .hero-specimen {
    width: min(100%, 40rem);
    min-height: 31rem;
    margin-inline: auto;
  }

  .hero-specimen::before {
    inset-inline: 0;
    transform: none;
  }

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

  .toc {
    position: static;
    max-height: none;
    padding: 1.2rem 0;
    border-top: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
  }

  .toc ol {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0 1.5rem;
  }

  .lesson {
    width: 100%;
  }

  .chapter {
    width: min(100%, var(--prose));
    margin-inline: auto;
  }

  .wide {
    width: min(var(--wide), calc(100vw - 2 * var(--gutter)));
    margin-left: 50%;
    transform: translateX(-50%);
  }

  .js-ready .chapter {
    transform: translateY(1.25rem);
  }

  .js-ready .chapter.is-visible {
    transform: none;
  }
}

@media (max-width: 48rem) {
  body {
    font-size: 1rem;
  }

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

  .hero {
    min-height: 0;
    padding-block: 4.5rem;
  }

  .hero h1 {
    font-size: clamp(3rem, 14vw, 5rem);
  }

  .hero-specimen {
    min-height: 27rem;
  }

  .hero-layer {
    right: 2%;
    left: 2%;
    grid-template-columns: 6.5rem 1fr;
  }

  .derived-tag {
    right: 0 !important;
  }

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

  .four-layer-map,
  .provenance-grid,
  .not-fields,
  .rule-grid,
  .learning-grid,
  .callout-grid,
  .compare-grid,
  .boundary-cards,
  .advanced-grid,
  .provenance-board,
  .glossary,
  .checklist {
    grid-template-columns: 1fr;
  }

  .four-layer-map {
    gap: .55rem;
  }

  .four-layer-map > i {
    transform: rotate(90deg);
  }

  .four-layer-map article {
    min-height: 10rem;
  }

  .lab-toolbar,
  .calldata-head,
  .quiz-head {
    align-items: flex-start;
    flex-direction: column;
  }

  .lab-grid,
  .fee-lab {
    grid-template-columns: 1fr;
  }

  .transaction-card,
  .fee-controls {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .lab-summary {
    grid-template-columns: 1fr;
  }

  .nonce-queue {
    grid-template-columns: repeat(5, 5rem);
    overflow-x: auto;
    padding-bottom: .6rem;
  }

  .route-diagram,
  .gas-vessel {
    grid-template-columns: 1fr;
  }

  .byte-ruler {
    display: none;
  }

  .calldata-bytes {
    grid-template-columns: 1fr;
    padding-top: 1rem;
  }

  .byte-segment {
    min-height: 6.5rem;
  }

  .decode-panel {
    grid-template-columns: 1fr;
  }

  .decode-panel > p:last-child {
    grid-row: auto;
    grid-column: auto;
  }

  .fee-model {
    grid-template-columns: 1fr;
  }

  .fee-model > b {
    transform: rotate(90deg);
  }

  .signing-pipeline,
  .final-model {
    grid-template-columns: 1fr;
    margin-bottom: 2.5rem;
  }

  .signing-pipeline > article,
  .final-model > div {
    min-height: 7.5rem;
  }

  .signing-pipeline > i,
  .final-model > i {
    transform: rotate(90deg);
  }

  .pipeline-branch {
    position: relative;
    right: auto;
    bottom: auto;
    min-width: 0;
  }

  .pipeline-branch::before {
    display: none;
  }

  .model-result {
    grid-column: auto;
  }

  .field-truth > div {
    grid-template-columns: 1fr 6rem 1.4fr;
  }

  .type-tabs {
    grid-template-columns: repeat(5, minmax(6rem, 1fr));
    overflow-x: auto;
  }

  .type-detail {
    grid-template-columns: 1fr;
  }

  .type-detail ul {
    grid-column: auto;
  }

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

  .data-table {
    display: block;
    overflow-x: auto;
    white-space: normal;
  }

  .site-footer {
    align-items: flex-start;
    flex-direction: column;
    justify-content: center;
    gap: .6rem;
    padding-block: 1.5rem;
  }
}

@media (max-width: 31rem) {
  :root {
    --gutter: 1rem;
  }

  .brand {
    font-size: .76rem;
    letter-spacing: .28em;
  }

  .lesson-path {
    font-size: .58rem;
  }

  .hero {
    padding-top: 3.5rem;
  }

  .hero-specimen {
    min-height: 24rem;
  }

  .hero-layer {
    min-height: 4.4rem;
    grid-template-columns: 5.2rem 1fr;
    padding: .75rem;
  }

  .hero-layer b,
  .hero-layer span {
    font-size: .55rem;
  }

  .derived-tag::before {
    width: 2rem;
  }

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

  .field-stack > div {
    grid-template-columns: 1fr;
  }

  .field-stack button {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .account-counter {
    align-items: flex-start;
    flex-direction: column;
  }

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

  .equation small {
    grid-column: 1;
  }

  .field-truth {
    overflow-x: auto;
  }

  .field-truth > div {
    min-width: 34rem;
  }

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

  .sidecar-map i {
    transform: rotate(90deg);
  }

  .source-item {
    grid-template-columns: 2rem 1fr;
  }
}

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

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: .01ms !important;
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
  }

  .js-ready .chapter {
    opacity: 1;
    transform: none;
  }
}

@media (forced-colors: active) {
  :root {
    --void: Canvas;
    --deep: Canvas;
    --panel: Canvas;
    --panel-raised: Canvas;
    --paper: CanvasText;
    --soft: CanvasText;
    --muted: CanvasText;
    --faint: GrayText;
    --line: ButtonBorder;
    --line-strong: ButtonBorder;
    --eth: LinkText;
    --cyan: LinkText;
    --amber: MarkText;
    --good: CanvasText;
    --bad: CanvasText;
  }

  *,
  *::before,
  *::after {
    forced-color-adjust: auto;
    box-shadow: none !important;
  }

  .hero-layer,
  .vessel-fill,
  .nonce-slot,
  .fee-status {
    border: 1px solid CanvasText;
  }
}

@media print {
  :root {
    color-scheme: light;
    --void: #fff;
    --deep: #fff;
    --panel: #fff;
    --panel-raised: #fff;
    --paper: #111;
    --soft: #222;
    --muted: #555;
    --faint: #777;
    --line: #ccc;
    --line-strong: #888;
    --eth: #5147b8;
    --eth-soft: #f1efff;
    --eth-line: #776ccf;
    --cyan: #246b63;
    --cyan-soft: #eef8f6;
    --amber: #805b18;
    --amber-soft: #fff7e8;
    --good: #2f6b3c;
    --bad: #8b3324;
  }

  html,
  body {
    background: #fff;
  }

  body::before,
  .reading-progress,
  .skip-link,
  .toc,
  .hero-actions,
  .sample-switcher,
  .nonce-controls,
  .fee-controls,
  .type-tabs,
  .quiz-options,
  .course-close a {
    display: none !important;
  }

  .site-header,
  .hero,
  .thesis,
  .page-grid,
  .course-close,
  .site-footer {
    width: 100%;
  }

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

  .hero-specimen {
    min-height: 25rem;
  }

  .page-grid {
    display: block;
    padding-top: 2rem;
  }

  .chapter,
  .wide {
    width: 100%;
    margin-left: 0;
    transform: none;
  }

  .js-ready .chapter {
    opacity: 1;
    transform: none;
  }

  .transaction-lab,
  .nonce-lab,
  .calldata-lab,
  .fee-lab,
  .type-switcher,
  .quiz {
    break-inside: avoid;
  }

  .lab-grid,
  .fee-lab {
    grid-template-columns: 1fr 1fr;
  }

  a {
    text-decoration: underline;
  }

  .source-item a::after {
    content: " (" attr(href) ")";
    font-family: var(--mono);
    font-size: .72em;
  }
}