:root {
  color-scheme: dark;
  --ink: #f5f0e6;
  --ink-soft: #d8d1c6;
  --muted: #989187;
  --dim: #706a63;
  --void: #050505;
  --ground: #09090a;
  --panel: #0e0e10;
  --panel-2: #141416;
  --line: rgba(245, 240, 230, 0.13);
  --line-strong: rgba(245, 240, 230, 0.31);
  --violet: #a89cff;
  --violet-dim: rgba(168, 156, 255, 0.1);
  --cyan: #86d8cf;
  --cyan-dim: rgba(134, 216, 207, 0.09);
  --amber: #ddb778;
  --amber-dim: rgba(221, 183, 120, 0.09);
  --danger: #e58f7d;
  --danger-dim: rgba(229, 143, 125, 0.09);
  --success: #acd4b3;
  --success-dim: rgba(172, 212, 179, 0.09);
  --serif: "Songti SC", "STSong", "Noto Serif CJK SC", "Source Han Serif SC", Georgia, serif;
  --sans: Inter, "Helvetica Neue", Helvetica, Arial, "PingFang SC", sans-serif;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  --shell: 84rem;
  --reading: 48rem;
  --gutter: clamp(1.15rem, 4vw, 4rem);
}

*,
*::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(--ink);
  background:
    radial-gradient(60rem 40rem at 72% -4%, rgba(48, 44, 58, 0.42), transparent 70%),
    radial-gradient(48rem 34rem at -8% 27%, rgba(134, 216, 207, 0.035), transparent 72%),
    linear-gradient(rgba(245, 240, 230, 0.017) 1px, transparent 1px) 0 0 / 100% 11rem,
    var(--void);
  font-family: var(--serif);
  font-size: clamp(1.02rem, 1.08vw, 1.12rem);
  line-height: 1.88;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

body::before {
  position: fixed;
  inset: 0;
  z-index: -1;
  content: "";
  pointer-events: none;
  opacity: 0.17;
  background-image:
    radial-gradient(circle at 17% 29%, rgba(255, 255, 255, 0.09) 0 0.5px, transparent 0.8px),
    radial-gradient(circle at 79% 67%, rgba(255, 255, 255, 0.05) 0 0.5px, transparent 0.75px);
  background-size: 97px 89px, 149px 137px;
}

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

a {
  color: inherit;
  text-decoration-color: var(--line-strong);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.28em;
  transition: color 160ms ease, border-color 160ms ease, background-color 160ms ease;
}

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

button,
input {
  font: inherit;
}

button {
  color: inherit;
}

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

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

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

h1,
h2,
h3,
h4 {
  font-weight: 400;
}

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

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

sup {
  font-family: var(--sans);
  font-size: 0.64em;
}

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

[hidden] {
  display: none !important;
}

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

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

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

.reading-progress {
  position: fixed;
  inset: 0 0 auto;
  z-index: 90;
  height: 2px;
  background: rgba(245, 240, 230, 0.04);
  pointer-events: none;
}

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

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

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

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

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

.course-mark {
  margin: 0;
  color: var(--muted);
  font-family: var(--sans);
  font-size: 0.67rem;
  letter-spacing: 0.14em;
  line-height: 1.6;
  text-align: right;
  text-transform: uppercase;
}

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

.hero {
  position: relative;
  min-height: min(58rem, calc(100dvh - 5rem));
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(19rem, 0.76fr);
  gap: clamp(3rem, 8vw, 8rem);
  align-items: end;
  padding: clamp(5rem, 11vw, 9rem) 0 clamp(4rem, 8vw, 6.5rem);
  border-bottom: 1px solid var(--line-strong);
  isolation: isolate;
  overflow: hidden;
}

.hero::before {
  position: absolute;
  top: 0;
  left: 50%;
  width: 1px;
  height: 3rem;
  content: "";
  background: linear-gradient(transparent, var(--line-strong));
}

.hero::after {
  position: absolute;
  right: -0.04em;
  bottom: -0.28em;
  z-index: -1;
  color: rgba(245, 240, 230, 0.027);
  content: "22.02";
  font-family: var(--mono);
  font-size: clamp(9rem, 23vw, 22rem);
  letter-spacing: -0.09em;
  line-height: 1;
  pointer-events: none;
  user-select: none;
}

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

.eyebrow,
.chapter-number,
.figure-kicker,
.lab-kicker {
  margin: 0;
  color: var(--muted);
  font-family: var(--sans);
  font-size: 0.67rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  line-height: 1.5;
  text-transform: uppercase;
}

.hero h1 {
  max-width: 12ch;
  margin: 1.5rem 0 1.8rem;
  font-size: clamp(3.5rem, 7vw, 7rem);
  letter-spacing: -0.045em;
  line-height: 1.03;
}

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

.hero-deck {
  max-width: 39rem;
  margin: 0;
  color: var(--ink-soft);
  font-size: clamp(1.08rem, 1.55vw, 1.34rem);
  line-height: 1.85;
}

.hero-deck strong {
  color: var(--ink);
  font-weight: 500;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.4rem;
  margin: 2.4rem 0 0;
  padding: 1.15rem 0 0;
  border-top: 1px solid var(--line);
  list-style: none;
  color: var(--muted);
  font-family: var(--sans);
  font-size: 0.69rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.hero-meta li {
  position: relative;
}

.hero-meta li + li::before {
  position: absolute;
  top: 0.58em;
  left: -0.78rem;
  width: 3px;
  height: 3px;
  content: "";
  background: var(--dim);
  transform: rotate(45deg);
}

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

.pipeline-console {
  position: relative;
  border: 1px solid var(--line-strong);
  background: rgba(8, 8, 9, 0.72);
}

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

.pipeline-console::before {
  top: -1px;
  left: -1px;
  border-top: 1px solid var(--cyan);
  border-left: 1px solid var(--cyan);
}

.pipeline-console::after {
  right: -1px;
  bottom: -1px;
  border-right: 1px solid var(--violet);
  border-bottom: 1px solid var(--violet);
}

.pipeline-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.8rem 1rem;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.64rem;
  letter-spacing: 0.09em;
}

.pipeline-head span:last-child {
  color: var(--success);
}

.pipeline-list {
  padding: 1rem;
}

.pipeline-node {
  display: grid;
  grid-template-columns: 2.2rem minmax(0, 1fr) auto;
  gap: 0.85rem;
  align-items: center;
  min-height: 4.45rem;
  padding: 0.65rem 0.75rem;
  border: 1px solid var(--line);
  background: rgba(245, 240, 230, 0.012);
}

.pipeline-node + .pipeline-node {
  margin-top: 1.35rem;
}

.pipeline-node + .pipeline-node::before {
  position: absolute;
  content: "";
}

.pipeline-node > span:first-child {
  color: var(--dim);
  font-family: var(--mono);
  font-size: 0.68rem;
}

.pipeline-node b {
  display: block;
  font-family: var(--sans);
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.08em;
}

.pipeline-node small {
  display: block;
  margin-top: 0.14rem;
  color: var(--muted);
  font-size: 0.73rem;
  line-height: 1.55;
}

.pipeline-node > span:last-child {
  color: var(--cyan);
  font-family: var(--mono);
  font-size: 0.63rem;
}

.pipeline-arrow {
  height: 1.35rem;
  display: grid;
  place-items: center;
  color: var(--dim);
  font-family: var(--mono);
  font-size: 0.75rem;
}

.pipeline-foot {
  margin: 0;
  padding: 0.8rem 1rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.65rem;
}

.thesis {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border-bottom: 1px solid var(--line-strong);
}

.thesis-item {
  min-height: 13rem;
  padding: clamp(2rem, 4vw, 3.2rem);
}

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

.thesis-item > span {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.63rem;
  letter-spacing: 0.1em;
}

.thesis-item p {
  margin: 2.4rem 0 0;
  color: var(--ink-soft);
  font-size: 1.03rem;
  line-height: 1.8;
}

.thesis-item strong {
  display: block;
  margin-bottom: 0.45rem;
  color: var(--ink);
  font-size: 1.18rem;
  font-weight: 400;
}

.lesson-safety {
  display: grid;
  grid-template-columns: 9rem minmax(0, 1fr);
  gap: 1.5rem;
  margin: 2rem 0 0;
  padding: 1rem 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  color: var(--muted);
}

.lesson-safety strong {
  color: var(--amber);
  font-family: var(--sans);
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

.lesson-safety p {
  margin: 0;
  font-size: 0.83rem;
  line-height: 1.75;
}

.content-grid {
  display: grid;
  grid-template-columns: 14rem minmax(0, 1fr);
  gap: clamp(3rem, 7vw, 8rem);
  align-items: start;
  padding: clamp(5rem, 10vw, 9rem) 0;
}

.sidebar {
  position: sticky;
  top: 2rem;
  align-self: start;
}

.toc-title {
  margin: 0 0 1rem;
  color: var(--dim);
  font-family: var(--mono);
  font-size: 0.62rem;
  letter-spacing: 0.13em;
  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 {
  position: relative;
  display: grid;
  grid-template-columns: 2rem minmax(0, 1fr);
  gap: 0.45rem;
  padding: 0.75rem 0;
  color: var(--muted);
  font-family: var(--sans);
  font-size: 0.72rem;
  line-height: 1.45;
  text-decoration: none;
  transition: color 160ms ease, transform 160ms ease;
}

.toc a::before {
  content: attr(data-number);
  color: var(--dim);
  font-family: var(--mono);
  font-size: 0.63rem;
}

.toc a:hover,
.toc a.is-active {
  color: var(--ink);
  transform: translateX(0.3rem);
}

.toc a.is-active::before {
  color: var(--cyan);
}

.lesson {
  min-width: 0;
}

.chapter {
  width: min(100%, var(--reading));
  margin-inline: auto;
  padding: 0 0 clamp(6.5rem, 12vw, 10rem);
}

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

.chapter + .chapter {
  padding-top: clamp(1rem, 2vw, 2rem);
}

.chapter-header {
  position: relative;
  margin-bottom: clamp(2.3rem, 5vw, 4rem);
  padding-top: 1.1rem;
  border-top: 1px solid var(--line-strong);
}

.chapter-header h2 {
  max-width: 19ch;
  margin: 1.2rem 0 0;
  font-size: clamp(2.2rem, 4.4vw, 4.5rem);
  letter-spacing: -0.035em;
  line-height: 1.14;
}

.section-deck {
  max-width: 42rem;
  margin: 1.25rem 0 0;
  color: var(--muted);
  font-size: 0.96rem;
}

.lead {
  margin: 0 0 2.5rem;
  color: var(--ink-soft);
  font-size: clamp(1.14rem, 1.65vw, 1.34rem);
  line-height: 1.9;
}

.lead strong,
.lesson strong {
  color: var(--ink);
  font-weight: 500;
}

.lesson > .chapter > p:not(.lead),
.chapter > p:not(.lead) {
  max-width: var(--reading);
  margin-right: auto;
  margin-left: auto;
}

.chapter h3 {
  margin: 3rem 0 1rem;
  font-size: clamp(1.35rem, 2vw, 1.82rem);
  line-height: 1.35;
}

.chapter h4 {
  margin: 1.5rem 0 0.65rem;
  font-size: 1.05rem;
}

.figure,
.diagram {
  margin: 2.8rem 0;
}

.figure {
  border: 1px solid var(--line-strong);
  background: rgba(245, 240, 230, 0.012);
}

.figure-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1.5rem;
  padding: 1rem 1.15rem;
  border-bottom: 1px solid var(--line);
}

.figure-title {
  margin: 0 !important;
  font-family: var(--sans);
  font-size: 0.83rem !important;
  font-weight: 500 !important;
  letter-spacing: 0.05em;
}

.figure-kicker {
  flex: none;
}

.figure figcaption,
.diagram-caption {
  margin: 0;
  padding: 0.9rem 1.15rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.78rem;
  line-height: 1.75;
}

.flow-diagram {
  display: grid;
  grid-template-columns: repeat(7, auto);
  gap: 0.55rem;
  align-items: stretch;
  padding: clamp(1.1rem, 3vw, 2rem);
}

.flow-node {
  min-width: 0;
  display: grid;
  align-content: center;
  padding: 0.9rem;
  border: 1px solid var(--line);
  background: var(--panel);
}

.flow-node span,
.artifact-card span,
.stack-card span,
.compare-card > span,
.result-card span,
.security-card > span {
  color: var(--dim);
  font-family: var(--mono);
  font-size: 0.62rem;
  letter-spacing: 0.08em;
}

.flow-node b {
  margin-top: 0.35rem;
  font-family: var(--sans);
  font-size: 0.76rem;
  font-weight: 500;
  line-height: 1.4;
}

.flow-node small {
  margin-top: 0.35rem;
  color: var(--muted);
  font-size: 0.7rem;
  line-height: 1.55;
}

.flow-arrow {
  display: grid;
  place-items: center;
  color: var(--dim);
  font-family: var(--mono);
  font-size: 0.72rem;
}

.artifact-grid,
.compare-grid,
.stack-grid,
.security-grid,
.glossary-grid,
.sources-grid,
.result-grid {
  display: grid;
  gap: 1px;
  padding: 1px;
  background: var(--line);
}

.artifact-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.artifact-card,
.compare-card,
.stack-card,
.security-card,
.glossary-item,
.source-item,
.result-card {
  min-width: 0;
  background: var(--ground);
}

.artifact-card,
.stack-card,
.security-card {
  padding: 1.35rem;
}

.artifact-card h3,
.stack-card h3,
.security-card h3 {
  margin: 1rem 0 0.65rem;
  font-size: 1.1rem;
}

.artifact-card p,
.stack-card p,
.security-card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.82rem;
  line-height: 1.75;
}

.artifact-card code {
  display: inline-block;
  margin-top: 0.9rem;
}

.compile-bridge {
  display: grid;
  grid-template-columns: 1fr auto 1.2fr auto 1fr;
  gap: 0.8rem;
  align-items: center;
  padding: clamp(1.2rem, 3vw, 2rem);
}

.bridge-node {
  min-height: 8rem;
  display: grid;
  align-content: center;
  padding: 1rem;
  border: 1px solid var(--line);
  background: var(--panel);
}

.bridge-node span {
  color: var(--dim);
  font-family: var(--mono);
  font-size: 0.62rem;
}

.bridge-node b {
  margin-top: 0.5rem;
  font-family: var(--sans);
  font-size: 0.8rem;
  font-weight: 500;
}

.bridge-node small {
  margin-top: 0.45rem;
  color: var(--muted);
  font-size: 0.72rem;
  line-height: 1.6;
}

.bridge-node.compiler {
  border-color: rgba(168, 156, 255, 0.5);
  background: var(--violet-dim);
}

.bridge-arrow {
  color: var(--dim);
  font-family: var(--mono);
  font-size: 0.7rem;
}

.code-block {
  position: relative;
  margin: 2rem 0;
  border: 1px solid var(--line-strong);
  background: #080809;
}

.code-head {
  min-height: 2.7rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.6rem 0.9rem;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.65rem;
}

.copy-code {
  padding: 0.28rem 0.5rem;
  border: 1px solid var(--line);
  color: var(--muted);
  background: transparent;
  font-family: var(--sans);
  font-size: 0.62rem;
  letter-spacing: 0.06em;
  cursor: pointer;
}

.copy-code:hover {
  color: var(--ink);
  border-color: var(--line-strong);
}

.code-block pre {
  margin: 0;
  padding: 1.2rem;
  overflow-x: auto;
  color: var(--ink-soft);
  font-size: 0.75rem;
  line-height: 1.78;
  tab-size: 2;
}

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

.token-keyword {
  color: var(--violet);
}

.token-type,
.token-function {
  color: var(--cyan);
}

.token-string,
.token-number {
  color: var(--amber);
}

.token-comment {
  color: var(--dim);
}

.code-note {
  margin: 0;
  padding: 0.8rem 1rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.76rem;
}

.contract-anatomy {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(15rem, 0.68fr);
  gap: 1px;
  background: var(--line);
}

.annotation-list {
  margin: 0;
  padding: 0;
  background: var(--ground);
  list-style: none;
}

.annotation-list li {
  padding: 1rem 1.1rem;
  color: var(--muted);
  font-size: 0.78rem;
}

.annotation-list li + li {
  border-top: 1px solid var(--line);
}

.annotation-list b {
  display: block;
  margin-bottom: 0.25rem;
  color: var(--ink);
  font-family: var(--sans);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.05em;
}

.stack-grid {
  grid-template-columns: repeat(5, minmax(0, 1fr));
}

.stack-card {
  position: relative;
  min-height: 12rem;
}

.stack-card::after {
  position: absolute;
  right: 1rem;
  bottom: 0.7rem;
  color: rgba(245, 240, 230, 0.045);
  content: attr(data-level);
  font-family: var(--mono);
  font-size: 2.8rem;
}

.stack-card:nth-child(1) {
  border-top: 2px solid var(--cyan);
}

.stack-card:nth-child(2) {
  border-top: 2px solid var(--violet);
}

.stack-card:nth-child(3) {
  border-top: 2px solid var(--amber);
}

.stack-card:nth-child(4) {
  border-top: 2px solid var(--danger);
}

.stack-card:nth-child(5) {
  border-top: 2px solid var(--success);
}

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

.compare-card {
  padding: 1.45rem;
}

.compare-card h3 {
  margin: 1rem 0 0.75rem;
  font-size: 1.25rem;
}

.compare-card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.82rem;
}

.compare-card ul {
  margin: 1rem 0 0;
  padding: 0;
  list-style: none;
}

.compare-card li {
  padding: 0.55rem 0;
  border-top: 1px solid var(--line);
  color: var(--ink-soft);
  font-size: 0.76rem;
}

.compare-card.is-local {
  border-top: 2px solid var(--cyan);
}

.compare-card.is-testnet {
  border-top: 2px solid var(--violet);
}

.compare-card.is-mainnet {
  border-top: 2px solid var(--danger);
}

.table-wrap {
  margin: 2rem 0;
  overflow-x: auto;
  border: 1px solid var(--line-strong);
}

.call-table {
  width: 100%;
  min-width: 42rem;
  border-collapse: collapse;
  font-size: 0.78rem;
}

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

.call-table th {
  color: var(--muted);
  background: var(--panel);
  font-family: var(--sans);
  font-size: 0.65rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.call-table tr:last-child td {
  border-bottom: 0;
}

.call-table td:first-child {
  color: var(--ink);
  font-weight: 500;
}

.formula {
  margin: 2rem 0;
  padding: 1.3rem;
  border: 1px solid var(--line-strong);
  color: var(--ink-soft);
  background: linear-gradient(90deg, var(--violet-dim), transparent 65%);
  font-size: clamp(0.77rem, 1.2vw, 0.92rem);
  text-align: center;
  overflow-wrap: anywhere;
}

.protocol-note,
.warning-note {
  max-width: var(--reading);
  margin: 2.3rem auto;
  padding: 1.25rem 1.4rem;
  border-left: 2px solid var(--violet);
  background: var(--violet-dim);
}

.warning-note {
  border-color: var(--amber);
  background: var(--amber-dim);
}

.protocol-note strong,
.warning-note strong {
  display: block;
  margin-bottom: 0.3rem;
  color: var(--ink);
  font-family: var(--sans);
  font-size: 0.7rem;
  letter-spacing: 0.11em;
  text-transform: uppercase;
}

.protocol-note p,
.warning-note p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.85rem;
}

.lab {
  margin: 3rem 0;
  border: 1px solid var(--line-strong);
  background: rgba(245, 240, 230, 0.012);
}

.lab-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 2rem;
  padding: 1.2rem 1.35rem;
  border-bottom: 1px solid var(--line);
}

.lab-head h3 {
  margin: 0.55rem 0 0;
  font-size: 1.35rem;
}

.lab-head > p {
  max-width: 23rem;
  margin: 0;
  color: var(--muted);
  font-size: 0.76rem;
}

.lab-body {
  padding: 1.35rem;
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
}

.choice-button {
  min-height: 2.6rem;
  padding: 0.55rem 0.8rem;
  border: 1px solid var(--line);
  color: var(--muted);
  background: transparent;
  font-family: var(--sans);
  font-size: 0.7rem;
  cursor: pointer;
}

.choice-button:hover,
.choice-button.is-active,
.choice-button[aria-pressed="true"] {
  color: var(--ink);
  border-color: var(--violet);
  background: var(--violet-dim);
}

.result-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: 1.2rem;
}

.result-card {
  padding: 1rem;
}

.result-card strong {
  display: block;
  margin-top: 0.45rem;
  font-family: var(--sans);
  font-size: 0.9rem;
  font-weight: 500;
}

.result-card small {
  display: block;
  margin-top: 0.25rem;
  color: var(--muted);
  font-size: 0.7rem;
  line-height: 1.5;
}

.lab-verdict {
  margin: 1px 0 0;
  padding: 1rem;
  color: var(--ink-soft);
  background: var(--panel);
  font-size: 0.83rem;
}

.lab-verdict.is-pass {
  border-left: 2px solid var(--success);
}

.lab-verdict.is-warn {
  border-left: 2px solid var(--amber);
}

.lab-verdict.is-danger {
  border-left: 2px solid var(--danger);
}

.static-note {
  margin: 1rem 0 0;
  color: var(--dim);
  font-size: 0.72rem;
}

.deploy-track {
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  gap: 1px;
  padding: 1px;
  background: var(--line);
}

.deploy-stage {
  position: relative;
  min-height: 9.5rem;
  padding: 1rem 0.8rem;
  background: var(--ground);
}

.deploy-stage::before {
  display: grid;
  width: 1.4rem;
  height: 1.4rem;
  place-items: center;
  margin-bottom: 1.2rem;
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  color: var(--muted);
  content: attr(data-step);
  font-family: var(--mono);
  font-size: 0.58rem;
}

.deploy-stage b {
  display: block;
  font-family: var(--sans);
  font-size: 0.72rem;
  font-weight: 500;
}

.deploy-stage small {
  display: block;
  margin-top: 0.35rem;
  color: var(--muted);
  font-size: 0.67rem;
  line-height: 1.5;
}

.deploy-stage.is-active {
  background: var(--violet-dim);
}

.deploy-stage.is-active::before {
  color: var(--void);
  border-color: var(--violet);
  background: var(--violet);
}

.deployment-packet {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: 1px;
  background: var(--line);
}

.packet-column {
  padding: 1.3rem;
  background: var(--ground);
}

.packet-column h3 {
  margin: 0 0 1rem;
  font-size: 1.2rem;
}

.packet-row {
  display: grid;
  grid-template-columns: 7rem minmax(0, 1fr);
  gap: 0.8rem;
  padding: 0.65rem 0;
  border-top: 1px solid var(--line);
  font-size: 0.73rem;
}

.packet-row span {
  color: var(--muted);
  font-family: var(--mono);
}

.packet-row code {
  color: var(--ink-soft);
}

.read-write {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background: var(--line);
}

.call-lane {
  padding: 1.4rem;
  background: var(--ground);
}

.call-lane.read {
  border-top: 2px solid var(--cyan);
}

.call-lane.write {
  border-top: 2px solid var(--violet);
}

.call-lane h3 {
  margin: 0.8rem 0;
  font-size: 1.45rem;
}

.call-lane p {
  color: var(--muted);
  font-size: 0.8rem;
}

.call-steps {
  margin: 1.2rem 0 0;
  padding: 0;
  list-style: none;
}

.call-steps li {
  display: grid;
  grid-template-columns: 1.5rem minmax(0, 1fr);
  gap: 0.55rem;
  padding: 0.65rem 0;
  border-top: 1px solid var(--line);
  color: var(--ink-soft);
  font-size: 0.76rem;
}

.call-steps li::before {
  color: var(--dim);
  content: counter(list-item, decimal-leading-zero);
  font-family: var(--mono);
  font-size: 0.6rem;
}

.state-machine {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  padding: 1px;
  background: var(--line);
}

.state-node {
  min-height: 8.5rem;
  padding: 1rem;
  background: var(--ground);
}

.state-node span {
  color: var(--dim);
  font-family: var(--mono);
  font-size: 0.6rem;
}

.state-node b {
  display: block;
  margin-top: 0.8rem;
  font-family: var(--sans);
  font-size: 0.78rem;
  font-weight: 500;
}

.state-node small {
  display: block;
  margin-top: 0.35rem;
  color: var(--muted);
  font-size: 0.68rem;
  line-height: 1.55;
}

.state-node.is-active {
  background: var(--cyan-dim);
  box-shadow: inset 0 2px 0 var(--cyan);
}

.state-node.is-danger {
  background: var(--danger-dim);
  box-shadow: inset 0 2px 0 var(--danger);
}

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

.security-card {
  min-height: 13.5rem;
}

.checklist {
  margin: 2rem 0;
  padding: 1px;
  background: var(--line);
  list-style: none;
}

.checklist-item {
  display: grid;
  grid-template-columns: auto 2.3rem minmax(0, 1fr) auto;
  gap: 0.8rem;
  align-items: start;
  padding: 0.95rem 1rem;
  background: var(--ground);
}

.checklist-item + .checklist-item {
  margin-top: 1px;
}

.checklist-item input {
  width: 1rem;
  height: 1rem;
  margin: 0.3rem 0 0;
  accent-color: var(--cyan);
}

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

.checklist-item b {
  display: block;
  font-family: var(--sans);
  font-size: 0.76rem;
  font-weight: 500;
}

.checklist-item small {
  display: block;
  margin-top: 0.25rem;
  color: var(--muted);
  font-size: 0.7rem;
  line-height: 1.55;
}

.checklist-item em {
  color: var(--dim);
  font-family: var(--mono);
  font-size: 0.58rem;
  font-style: normal;
}

.checklist-item.is-checked {
  background: var(--success-dim);
}

.checklist-item.is-critical em {
  color: var(--danger);
}

.debug-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  padding: 1px;
  background: var(--line);
}

.debug-card {
  padding: 1.25rem;
  background: var(--ground);
}

.debug-card code {
  color: var(--amber);
}

.debug-card h3 {
  margin: 0.8rem 0;
  font-size: 1.18rem;
}

.debug-card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.78rem;
}

.recap-chain {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 1px;
  padding: 1px;
  background: var(--line);
}

.recap-link {
  min-height: 7.5rem;
  padding: 1rem;
  background: var(--ground);
}

.recap-link span {
  color: var(--dim);
  font-family: var(--mono);
  font-size: 0.6rem;
}

.recap-link b {
  display: block;
  margin-top: 0.65rem;
  font-family: var(--sans);
  font-size: 0.75rem;
  font-weight: 500;
}

.recap-link small {
  display: block;
  margin-top: 0.3rem;
  color: var(--muted);
  font-size: 0.66rem;
}

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

.quiz-item {
  padding: 1.4rem;
  background: var(--ground);
}

.quiz-item.is-correct {
  box-shadow: inset 2px 0 0 var(--success);
}

.quiz-item.is-incorrect {
  box-shadow: inset 2px 0 0 var(--danger);
}

.quiz-item.is-unanswered {
  box-shadow: inset 2px 0 0 var(--amber);
}

.quiz-item h3 {
  margin: 0;
  font-size: 1.1rem;
  line-height: 1.55;
}

.quiz-number {
  display: inline-block;
  width: 2.2rem;
  color: var(--dim);
  font-family: var(--mono);
  font-size: 0.65rem;
}

.quiz-options {
  display: grid;
  gap: 0.5rem;
  margin-top: 1.1rem;
}

.quiz-option {
  display: grid;
  grid-template-columns: 1.2rem minmax(0, 1fr);
  gap: 0.6rem;
  align-items: start;
  padding: 0.65rem 0.75rem;
  border: 1px solid var(--line);
  color: var(--muted);
  background: transparent;
  font-family: var(--serif);
  font-size: 0.8rem;
  text-align: left;
  cursor: pointer;
}

.quiz-option:hover,
.quiz-option.is-selected {
  color: var(--ink);
  border-color: var(--line-strong);
  background: var(--panel);
}

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

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

.quiz-answer {
  margin: 1rem 0 0;
  padding-top: 0.8rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.76rem;
}

.quiz-feedback {
  min-height: 1.3rem;
  margin-top: 0.8rem;
  color: var(--cyan);
  font-family: var(--sans);
  font-size: 0.7rem;
}

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

.glossary-item {
  padding: 1rem 1.1rem;
}

.glossary-item dt {
  color: var(--ink);
  font-family: var(--mono);
  font-size: 0.76rem;
}

.glossary-item dd {
  margin: 0.45rem 0 0;
  color: var(--muted);
  font-size: 0.76rem;
  line-height: 1.7;
}

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

.source-item {
  min-height: 9rem;
  padding: 1.1rem;
}

.source-item > span {
  color: var(--dim);
  font-family: var(--mono);
  font-size: 0.58rem;
}

.source-item h3 {
  margin: 0.7rem 0 0.5rem;
  font-family: var(--sans);
  font-size: 0.8rem;
  line-height: 1.45;
}

.source-item p {
  margin: 0;
  color: var(--muted);
  font-size: 0.7rem;
  line-height: 1.6;
}

.course-close {
  padding: clamp(4.5rem, 10vw, 8rem) 0;
  border-top: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line);
  text-align: center;
}

.course-close p {
  margin: 0 0 1rem;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.63rem;
  letter-spacing: 0.13em;
}

.course-close h2 {
  max-width: 22ch;
  margin: 0 auto;
  font-size: clamp(2.1rem, 5vw, 4.8rem);
  letter-spacing: -0.035em;
  line-height: 1.25;
}

.course-close h2 em {
  color: var(--violet);
  font-style: normal;
}

.site-footer {
  min-height: 9rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  color: var(--muted);
  font-family: var(--sans);
  font-size: 0.67rem;
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 1.6rem;
}

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

.js-enabled [data-reveal] {
  opacity: 0;
  transform: translateY(1.1rem);
  transition: opacity 500ms ease, transform 500ms ease;
}

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

.noscript-note {
  padding: 0.7rem var(--gutter);
  color: var(--muted);
  background: var(--panel);
  font-size: 0.76rem;
  text-align: center;
}

@media (max-width: 1120px) {
  .hero {
    grid-template-columns: minmax(0, 1fr) minmax(18rem, 0.75fr);
    gap: 3rem;
  }

  .content-grid {
    grid-template-columns: 1fr;
    gap: 3rem;
  }

  .sidebar {
    position: relative;
    top: auto;
    z-index: 2;
    overflow-x: auto;
  }

  .toc-title {
    display: none;
  }

  .toc ol {
    display: flex;
    min-width: max-content;
    border-bottom: 1px solid var(--line);
  }

  .toc li {
    border-bottom: 0;
  }

  .toc a {
    width: 10.5rem;
    padding-right: 1rem;
  }

  .toc a:hover,
  .toc a.is-active {
    transform: none;
  }

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

  .deploy-track {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (max-width: 860px) {
  .hero {
    min-height: auto;
    grid-template-columns: 1fr;
    align-items: start;
  }

  .hero-visual {
    max-width: 34rem;
  }

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

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

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

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

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

  .flow-arrow {
    min-height: 1.5rem;
    transform: rotate(90deg);
  }

  .compile-bridge {
    grid-template-columns: 1fr;
  }

  .bridge-arrow {
    text-align: center;
    transform: rotate(90deg);
  }

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

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

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

@media (max-width: 640px) {
  body {
    font-size: 1rem;
  }

  .masthead {
    min-height: 4.4rem;
  }

  .brand {
    font-size: 0.8rem;
  }

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

  .hero {
    padding-top: 4.5rem;
  }

  .hero h1 {
    font-size: clamp(3rem, 16vw, 5rem);
  }

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

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

  .lesson-safety {
    grid-template-columns: 1fr;
    gap: 0.4rem;
  }

  .content-grid {
    padding-top: 3.5rem;
  }

  .chapter-header h2 {
    font-size: clamp(2.1rem, 11vw, 3.2rem);
  }

  .figure-head,
  .lab-head {
    display: block;
  }

  .figure-kicker,
  .lab-head > p {
    margin-top: 0.6rem;
  }

  .artifact-grid,
  .stack-grid,
  .security-grid,
  .glossary-grid,
  .sources-grid,
  .result-grid,
  .debug-grid {
    grid-template-columns: 1fr;
  }

  .contract-anatomy,
  .deployment-packet,
  .read-write {
    grid-template-columns: 1fr;
  }

  .deploy-track,
  .state-machine,
  .recap-chain {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .choice-button {
    text-align: left;
  }

  .checklist-item {
    grid-template-columns: auto 2rem minmax(0, 1fr);
  }

  .checklist-item em {
    display: none;
  }

  .site-footer {
    min-height: 11rem;
    display: block;
    padding: 2.5rem 0;
  }

  .footer-nav {
    margin-top: 1rem;
  }
}

@media (max-width: 420px) {
  .pipeline-node {
    grid-template-columns: 1.8rem minmax(0, 1fr);
  }

  .pipeline-node > span:last-child {
    grid-column: 2;
  }

  .deploy-track,
  .state-machine,
  .recap-chain {
    grid-template-columns: 1fr;
  }
}

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

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

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

@media (forced-colors: active) {
  *,
  *::before,
  *::after {
    forced-color-adjust: auto;
  }

  .pipeline-console,
  .figure,
  .lab,
  .code-block,
  .table-wrap,
  .choice-button,
  .quiz-option {
    border-color: CanvasText;
  }

  .is-active,
  .is-pass,
  .is-warn,
  .is-danger {
    outline: 2px solid Highlight;
    outline-offset: -2px;
  }
}

@media print {
  :root {
    color-scheme: light;
    --ink: #111;
    --ink-soft: #292929;
    --muted: #555;
    --dim: #777;
    --void: #fff;
    --ground: #fff;
    --panel: #f5f5f5;
    --panel-2: #eee;
    --line: rgba(0, 0, 0, 0.16);
    --line-strong: rgba(0, 0, 0, 0.34);
  }

  body {
    color: #111;
    background: #fff;
    font-size: 10.5pt;
  }

  body::before,
  .reading-progress,
  .skip-link,
  .sidebar,
  .copy-code,
  .button-row,
  .footer-nav {
    display: none !important;
  }

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

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

  .hero-visual {
    max-width: 30rem;
  }

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

  .chapter {
    width: 100%;
    padding-bottom: 3rem;
    break-inside: auto;
  }

  .figure,
  .diagram,
  .lab,
  .code-block,
  .quiz-item,
  .source-item {
    break-inside: avoid;
  }

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

  a {
    color: #111;
    text-decoration: none;
  }

  .source-item a::after {
    content: " (" attr(href) ")";
    color: #555;
    font-family: var(--mono);
    font-size: 0.7em;
  }
}