:root {
  --bg: #f7f5f1;
  --paper: #fffefa;
  --ink: #191817;
  --ink-soft: #4a4642;
  --muted: #837c74;
  --faint: #b8b0a6;
  --line: #e4ddd3;
  --line-strong: #d3cabe;
  --accent: #dd6b2a;
  --dark: #24221f;
  --max: 1260px;
  --content: 800px;
  --side: 190px;
  --font: "Manrope", Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --display: "Onest", var(--font);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  font-family: var(--font);
  background: var(--bg);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

::selection {
  color: var(--ink);
  background: #efd5c4;
}

.skip-link {
  position: fixed;
  left: 18px;
  top: 12px;
  z-index: 100;
  padding: 10px 13px;
  border-radius: 999px;
  color: #fff;
  background: var(--dark);
  text-decoration: none;
  transform: translateY(-72px);
  transition: transform 0.18s ease;
}

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

.read-progress {
  position: fixed;
  inset: 0 0 auto;
  z-index: 60;
  height: 2px;
}

.read-progress span {
  display: block;
  width: 0%;
  height: 100%;
  background: var(--accent);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  display: grid;
  grid-template-columns: minmax(280px, 1fr) auto;
  align-items: center;
  gap: 28px;
  padding: 14px max(24px, calc((100vw - var(--max)) / 2));
  border-bottom: 1px solid var(--line);
  background: rgba(247, 245, 241, 0.9);
  backdrop-filter: blur(16px);
}

.brand,
.global-search,
.header-actions,
.article-toolbar,
.article-footer-actions,
.site-footer,
.network-map,
.related-heading {
  display: flex;
  align-items: center;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  width: max-content;
  color: var(--ink);
  text-decoration: none;
}

.brand-logo {
  display: block;
  width: 150px;
  height: auto;
}

.brand-divider {
  width: 1px;
  height: 28px;
  background: var(--line-strong);
}

.brand-descriptor {
  max-width: 210px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 600;
  line-height: 1.25;
  letter-spacing: -0.01em;
}

.site-link,
.articles-link,
.docs-link,
.copy-link,
.plain-link,
.site-footer a,
.toc-panel a {
  color: var(--muted);
  font-family: var(--font);
  font-weight: 600;
  letter-spacing: -0.01em;
  text-decoration: none;
  font-size: 14px;
  transition: color 0.18s ease, border-color 0.18s ease;
}

.site-link:hover,
.articles-link:hover,
.articles-link.is-active,
.docs-link:hover,
.docs-link.is-active,
.copy-link:hover,
.plain-link:hover,
.site-footer a:hover,
.toc-panel a:hover,
.toc-panel a.is-active,
.toc-panel a:hover {
  color: var(--accent);
}

.global-search {
  justify-content: flex-end;
  width: 34px;
  min-height: 38px;
  gap: 9px;
  overflow: hidden;
  transition: width 0.24s ease;
}

.global-search.is-open,
.global-search:focus-within {
  width: min(290px, 34vw);
}

.search-toggle {
  display: inline-flex;
  flex: 0 0 auto;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 30px;
  padding: 0;
  border: 0;
  color: var(--muted);
  background: transparent;
  cursor: pointer;
  transition: color 0.18s ease, transform 0.18s ease;
}

.search-toggle:hover,
.global-search.is-open .search-toggle,
.global-search:focus-within .search-toggle {
  color: var(--accent);
}

.search-toggle svg {
  width: 17px;
  height: 17px;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.7;
}

.global-search input {
  width: 0;
  min-width: 0;
  height: 31px;
  border: 0;
  border-bottom: 1px solid transparent;
  outline: 0;
  color: var(--ink);
  background: transparent;
  font: inherit;
  font-size: 14px;
  opacity: 0;
  transition: width 0.24s ease, opacity 0.16s ease, border-color 0.18s ease;
}

.global-search.is-open input,
.global-search:focus-within input {
  width: 230px;
  border-color: var(--line-strong);
  opacity: 1;
}

.global-search input::placeholder {
  color: var(--faint);
}

.global-search input::-webkit-search-cancel-button,
.global-search input::-webkit-search-decoration,
.global-search input::-webkit-search-results-button,
.global-search input::-webkit-search-results-decoration {
  display: none;
  -webkit-appearance: none;
  appearance: none;
}

.header-actions {
  justify-self: end;
  justify-content: flex-end;
  gap: 16px;
}

.mobile-menu-toggle {
  display: none;
}

.articles-link,
.docs-link {
  display: inline-flex;
  align-items: center;
  min-height: 38px;
  padding: 0;
  border: 0;
  background: transparent;
  font-weight: 650;
}

.articles-link:hover,
.articles-link.is-active,
.docs-link:hover,
.docs-link.is-active {
  color: var(--accent);
}

.header-actions-divider {
  width: 1px;
  height: 24px;
  background: var(--line-strong);
}

.site-link {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  justify-self: end;
  font-weight: 650;
}

.site-link svg {
  width: 14px;
  height: 14px;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.8;
  transition: transform 0.18s ease;
}

.site-link:hover svg {
  transform: translate(2px, -2px);
}

a:focus-visible,
button:focus-visible {
  outline: 2px solid rgba(221, 107, 42, 0.32);
  outline-offset: 4px;
}

main,
.site-footer {
  width: min(var(--max), calc(100% - 40px));
  margin: 0 auto;
}

.section-kicker,
.overline,
.concept-list span,
.timeline span {
  color: var(--muted);
  font-size: 11px;
  font-weight: 720;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

.article-system {
  display: grid;
  grid-template-columns: minmax(0, var(--content)) var(--side);
  gap: 70px;
  justify-content: center;
  align-items: start;
  padding: 96px 0 98px;
  scroll-margin-top: 118px;
}

.toc-panel {
  position: sticky;
  top: 84px;
}

.article {
  min-width: 0;
  padding: 0 4px;
}

.article h1 {
  margin: 0;
  max-width: 840px;
  font-family: var(--display);
  font-size: clamp(38px, 4.35vw, 58px);
  font-weight: 680;
  line-height: 1.09;
  letter-spacing: -0.035em;
}

.dek {
  margin: 22px 0 0;
  color: var(--ink-soft);
  font-size: 21px;
  line-height: 1.62;
}

.article-toolbar {
  justify-content: space-between;
  gap: 18px;
  margin-top: 26px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
}

.article-toolbar div {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 16px;
}

.article-toolbar div span,
.copy-link {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 0;
  border: 0;
  color: var(--muted);
  background: transparent;
  font-size: 13px;
}

.article-toolbar div span + span::before {
  content: "";
  display: inline-block;
  width: 4px;
  height: 4px;
  margin-right: 16px;
  border-radius: 50%;
  background: var(--faint);
  vertical-align: middle;
}

.copy-link {
  cursor: pointer;
  font: inherit;
  font-size: 13px;
  font-weight: 650;
}

.copy-link.is-copied {
  color: var(--accent);
  border-color: var(--accent);
}

.copy-link:hover {
  color: var(--accent);
}

.summary-box {
  margin: 34px 0 44px;
  padding: 20px 22px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: rgba(255, 254, 250, 0.62);
}

.summary-box ul {
  display: grid;
  gap: 10px;
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
}

.summary-box li {
  position: relative;
  padding-left: 18px;
  color: #56514c;
  line-height: 1.58;
}

.summary-box li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--faint);
}

.network-figure {
  margin: 42px 0 48px;
}

.network-map {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 42px minmax(0, 1.12fr) 42px minmax(0, 1fr);
  gap: 0;
  min-height: 0;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 22px;
  background:
    radial-gradient(circle at 48% 0%, rgba(221, 107, 42, 0.08), transparent 34%),
    rgba(255, 254, 250, 0.58);
}

.map-node {
  display: grid;
  align-content: start;
  gap: 10px;
  min-width: 0;
  min-height: 162px;
  padding: 20px;
  border: 1px solid var(--line-strong);
  border-radius: 18px;
  text-align: left;
  font-weight: 680;
}

.map-node.muted {
  color: var(--ink-soft);
  background: rgba(255, 255, 255, 0.52);
}

.map-node.main {
  color: var(--ink);
  border-color: rgba(221, 107, 42, 0.28);
  background: linear-gradient(180deg, rgba(255, 244, 236, 0.96), rgba(255, 255, 255, 0.72));
  box-shadow: 0 18px 50px rgba(221, 107, 42, 0.1);
}

.map-node span,
.map-output span {
  color: var(--faint);
  font-family: var(--display);
  font-size: 13px;
  font-weight: 720;
  letter-spacing: -0.01em;
}

.map-node strong {
  display: block;
  color: var(--ink);
  font-family: var(--display);
  font-size: 24px;
  font-weight: 670;
  line-height: 1.1;
  letter-spacing: -0.025em;
}

.map-node small {
  display: block;
  color: var(--muted);
  font-size: 14px;
  font-weight: 520;
  line-height: 1.5;
}

.map-path {
  position: relative;
  align-self: center;
  height: 1px;
  min-width: 0;
  background: var(--line-strong);
}

.map-path span {
  position: absolute;
  inset: -1px auto auto 0;
  width: 62%;
  height: 3px;
  border-radius: 99px;
  background: var(--accent);
}

.map-path::after {
  content: "";
  position: absolute;
  right: 0;
  top: -4px;
  width: 9px;
  height: 9px;
  border-top: 1.5px solid var(--line-strong);
  border-right: 1.5px solid var(--line-strong);
  transform: rotate(45deg);
}

.map-output {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  margin-top: 14px;
  padding: 14px 16px;
  border: 1px solid rgba(221, 107, 42, 0.18);
  border-radius: 16px;
  background: rgba(255, 247, 241, 0.64);
}

.map-output strong {
  color: var(--ink);
  font-size: 15px;
  font-weight: 680;
  line-height: 1.45;
  text-align: right;
}

figcaption {
  margin-top: 12px;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.45;
}

.article p {
  color: #46423e;
  font-size: 18.5px;
  line-height: 1.86;
}

.article .lead {
  color: var(--ink);
  margin: 34px 0 0;
  font-size: 22px;
  line-height: 1.68;
  letter-spacing: -0.01em;
}

.product-link {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid rgba(221, 107, 42, 0.34);
  transition: color 0.18s ease, border-color 0.18s ease;
}

.product-link:hover {
  color: var(--accent);
  border-color: currentColor;
}

.content-section {
  scroll-margin-top: 118px;
  margin-top: 48px;
}

.article h3 {
  margin: 0 0 18px;
  font-family: var(--display);
  font-size: 30px;
  font-weight: 660;
  line-height: 1.16;
  letter-spacing: -0.028em;
}

.note {
  margin: 42px 0;
  padding: 20px 22px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: rgba(255, 254, 250, 0.48);
}

.note span {
  color: var(--muted);
  font-size: 11px;
  font-weight: 720;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

.note p {
  margin: 10px 0 0;
  color: var(--ink);
  font-size: 20px;
  line-height: 1.5;
}

.concept-list {
  display: grid;
  margin: 28px 0 30px;
}

.concept-list div {
  display: grid;
  grid-template-columns: 82px 1fr;
  gap: 18px;
  padding: 18px 0;
  border-top: 1px solid var(--line);
}

.concept-list div:last-child {
  border-bottom: 1px solid var(--line);
}

.concept-list p {
  margin: 0;
  font-size: 17px;
  line-height: 1.64;
}

.timeline {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  margin: 30px 0 34px;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 14px;
  overflow: hidden;
}

.timeline div {
  padding: 20px;
  background: rgba(255, 254, 250, 0.48);
  border-right: 1px solid var(--line);
}

.timeline div:last-child {
  border-right: 0;
}

.timeline strong {
  display: block;
  margin: 14px 0 8px;
  font-size: 18px;
}

.timeline p {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.58;
}

blockquote {
  margin: 56px 0 0;
  padding: 30px 0 30px 26px;
  border-left: 2px solid var(--accent);
  font-family: var(--display);
  font-size: clamp(26px, 2.7vw, 34px);
  font-weight: 650;
  line-height: 1.24;
  letter-spacing: -0.026em;
}

.article-footer-actions {
  justify-content: flex-start;
  gap: 18px;
  margin-top: 46px;
  padding-top: 28px;
  border-top: 1px solid var(--line);
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  min-height: 44px;
  padding: 0 18px 0 20px;
  border-radius: 999px;
  color: #fff;
  background: var(--dark);
  font-weight: 700;
  text-decoration: none;
  box-shadow: 0 10px 26px rgba(36, 34, 31, 0.12);
  transition: transform 0.18s ease, background 0.18s ease, box-shadow 0.18s ease;
}

.button svg {
  width: 15px;
  height: 15px;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.8;
  transition: transform 0.18s ease;
}

.button:hover {
  transform: translateY(-2px);
  background: #111;
  box-shadow: 0 14px 32px rgba(36, 34, 31, 0.16);
}

.button:hover svg {
  transform: translate(2px, -2px);
}

.toc-panel {
  color: var(--muted);
  padding-top: 4px;
}

.toc-panel .overline {
  display: block;
  margin-bottom: 12px;
}

.toc-title {
  display: inline-flex !important;
  align-items: center;
  gap: 8px;
}

.toc-title svg {
  width: 15px;
  height: 15px;
  fill: none;
  stroke: var(--muted);
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.7;
}

.toc-panel a {
  position: relative;
  display: block;
  padding: 9px 0;
  border-top: 1px solid var(--line);
  font-size: 14px;
}

.toc-panel a.is-active::before {
  content: "";
  position: absolute;
  left: -14px;
  top: 9px;
  width: 2px;
  height: 18px;
  border-radius: 999px;
  background: var(--accent);
}

.related {
  padding: 58px 0 88px;
  border-top: 1px solid var(--line);
}

.related-heading {
  justify-content: space-between;
  gap: 40px;
  margin-bottom: 30px;
}

.related-heading h2 {
  max-width: 610px;
  margin: 0;
  font-family: var(--display);
  font-size: clamp(34px, 4.2vw, 50px);
  font-weight: 660;
  line-height: 1.08;
  letter-spacing: -0.03em;
}

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

.related-card {
  position: relative;
  display: block;
  min-height: 220px;
  padding: 24px 28px 24px 0;
  border-right: 1px solid var(--line);
  color: var(--ink);
  text-decoration: none;
  transition: color 0.18s ease;
}

.related-card + .related-card {
  padding-left: 28px;
}

.related-card:last-child {
  border-right: 0;
}

.related-card svg {
  position: absolute;
  top: 24px;
  right: 24px;
  width: 17px;
  height: 17px;
  fill: none;
  stroke: var(--muted);
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.7;
  transition: transform 0.18s ease, stroke 0.18s ease;
}

.related-card:hover svg {
  stroke: var(--accent);
  transform: translate(2px, -2px);
}

.related-card:hover h3 {
  color: var(--accent);
}

.related-grid h3 {
  margin: 18px 0 10px;
  padding-right: 28px;
  font-family: var(--display);
  font-size: 24px;
  font-weight: 660;
  line-height: 1.18;
  letter-spacing: -0.024em;
  transition: color 0.18s ease;
}

.related-grid p {
  margin: 0;
  color: var(--muted);
  line-height: 1.62;
}

.site-footer {
  justify-content: space-between;
  padding: 28px 0 46px;
  border-top: 1px solid var(--line);
  color: var(--muted);
}

.articles-page {
  width: min(1080px, calc(100% - 40px));
  margin: 0 auto;
  padding: 96px 0 104px;
}

.articles-hero {
  padding-bottom: 42px;
  border-bottom: 1px solid var(--line);
}

.articles-hero h1 {
  margin: 0 0 14px;
  font-family: var(--display);
  font-size: clamp(42px, 6.5vw, 70px);
  font-weight: 680;
  line-height: 1.02;
  letter-spacing: -0.035em;
}

.articles-hero p {
  max-width: 720px;
  margin: 0;
  color: var(--muted);
  font-size: 19px;
  line-height: 1.62;
}

.articles-list {
  display: grid;
  margin-top: 10px;
}

.search-status {
  margin: 0;
  padding: 18px 0 10px 86px;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
}

.article-list-card {
  position: relative;
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr) 36px;
  gap: 34px;
  align-items: start;
  padding: 34px 0;
  border-bottom: 1px solid var(--line);
  color: var(--ink);
  text-decoration: none;
  transition: border-color 0.18s ease, transform 0.18s ease;
}

.article-list-card[hidden] {
  display: none;
}

.article-card-index {
  color: var(--faint);
  font-family: var(--display);
  font-size: 15px;
  font-weight: 660;
  letter-spacing: -0.01em;
  transition: color 0.18s ease;
}

.article-card-body {
  display: grid;
  gap: 10px;
}

.article-list-card time {
  color: var(--muted);
  font-size: 12px;
  font-weight: 720;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.article-list-card h2 {
  max-width: 820px;
  margin: 0;
  font-family: var(--display);
  font-size: clamp(27px, 3.4vw, 40px);
  font-weight: 660;
  line-height: 1.14;
  letter-spacing: -0.026em;
  transition: color 0.18s ease;
}

.article-list-card p {
  max-width: 680px;
  margin: 0;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.6;
}

.article-card-arrow {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border: 1px solid var(--line);
  border-radius: 50%;
  color: var(--muted);
  background: rgba(255, 254, 250, 0.48);
  transition: color 0.18s ease, border-color 0.18s ease, background 0.18s ease, transform 0.18s ease;
}

.article-card-arrow svg {
  width: 15px;
  height: 15px;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.7;
}

.article-list-card:hover {
  border-color: var(--line-strong);
  transform: translateY(-1px);
}

.article-list-card:hover h2 {
  color: var(--accent);
}

.article-list-card:hover .article-card-index,
.article-list-card:hover .article-card-arrow {
  color: var(--accent);
}

.article-list-card:hover .article-card-arrow {
  border-color: rgba(221, 107, 42, 0.34);
  background: rgba(221, 107, 42, 0.07);
  transform: translate(2px, -2px);
}

.empty-state {
  margin: 34px 0 0;
  color: var(--muted);
  font-size: 16px;
}

.instructions-shell {
  display: grid;
  grid-template-columns: 220px minmax(0, 760px);
  gap: 86px;
  width: min(1080px, calc(100% - 40px));
  margin: 0 auto;
  padding: 96px 0 108px;
}

.instructions-sidebar {
  min-width: 0;
  grid-column: 1;
  grid-row: 1 / -1;
  position: sticky;
  top: 98px;
  align-self: start;
}

.instruction-mobile-menu-toggle,
.instruction-mobile-menu-backdrop {
  display: none;
}

.instructions-sidebar-inner {
  display: grid;
  gap: 18px;
  padding-top: 8px;
}

.instructions-sidebar p {
  margin: 0;
  color: var(--faint);
  font-size: 12px;
  font-weight: 720;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.instructions-sidebar nav {
  display: grid;
  gap: 4px;
}

.instructions-sidebar a {
  display: flex;
  align-items: center;
  min-height: 34px;
  padding-left: 14px;
  border-left: 1px solid var(--line);
  color: var(--muted);
  text-decoration: none;
  font-size: 14px;
  line-height: 1.3;
  transition: color 0.18s ease, border-color 0.18s ease;
}

.instructions-sidebar a.is-child {
  min-height: 30px;
  padding-left: 26px;
  color: var(--faint);
  font-size: 13px;
}

.instruction-nav-group {
  display: grid;
  gap: 2px;
}

.instruction-nav-parent {
  display: grid;
  grid-template-columns: 18px minmax(0, 1fr);
  gap: 7px;
  align-items: center;
}

.instruction-nav-parent a {
  order: 2;
  min-width: 0;
  padding-left: 0;
  border-left: 0;
}

.instruction-nav-parent button {
  order: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 18px;
  height: 28px;
  padding: 0;
  border: 0;
  color: var(--faint);
  background: transparent;
  cursor: pointer;
  transition: color 0.18s ease;
}

.instruction-nav-parent button:hover {
  color: var(--accent);
}

.instruction-nav-parent svg {
  width: 13px;
  height: 13px;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.9;
  transition: transform 0.18s ease;
}

.instruction-nav-group:not(.is-open) .instruction-nav-parent svg {
  transform: rotate(-90deg);
}

.instruction-nav-children {
  display: grid;
  gap: 2px;
  overflow: hidden;
  padding-left: 18px;
}

.instruction-nav-group:not(.is-open) .instruction-nav-children {
  display: none;
}

.instruction-nav-group[hidden] {
  display: none;
}

.instructions-sidebar a:hover,
.instructions-sidebar a.is-active {
  border-color: var(--accent);
  color: var(--ink);
}

.instruction-search-status {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.5;
}

.instruction-search-status[hidden],
.instructions-sidebar a[hidden],
.instruction-article[hidden],
.instruction-empty-state[hidden] {
  display: none;
}

.instruction-article {
  grid-column: 2;
  min-width: 0;
  scroll-margin-top: 96px;
}

.instruction-empty-state {
  grid-column: 2;
  align-self: start;
  margin: 0;
  padding: 32px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  color: var(--muted);
  font-size: 17px;
  line-height: 1.6;
}

.instruction-header {
  padding-bottom: 42px;
  border-bottom: 1px solid var(--line);
}

.instruction-eyebrow {
  margin: 0 0 16px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 720;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.instruction-header h1 {
  margin: 0 0 18px;
  font-family: var(--display);
  font-size: clamp(50px, 7vw, 86px);
  font-weight: 680;
  line-height: 0.98;
  letter-spacing: -0.04em;
}

.instruction-hello-title {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 0.01em 0.1em;
  max-width: 840px;
}

.instruction-hello-title .hello-comma {
  display: inline-block;
  margin-left: -0.02em;
}

.instruction-hello-title .hello-agent {
  display: inline-block;
  position: relative;
  z-index: 0;
  margin: 0 -0.22em 0 -0.12em;
  color: var(--accent);
  font-family: var(--display);
  font-size: 0.52em;
  font-weight: 760;
  font-style: italic;
  line-height: 1;
  letter-spacing: -0.06em;
  text-shadow: 0 10px 22px rgba(255, 105, 0, 0.12);
  transform: translateY(0.1em) rotate(11deg);
  transform-origin: 50% 60%;
}

.instruction-hello-title .hello-agent::after {
  position: absolute;
  right: 0.04em;
  bottom: 0.03em;
  left: 0.1em;
  z-index: -1;
  height: 0.16em;
  content: "";
  border-radius: 999px;
  background: rgba(255, 105, 0, 0.13);
  transform: rotate(-2deg);
}

.instruction-header h2 {
  margin: 0 0 14px;
  font-family: var(--display);
  font-size: clamp(38px, 5vw, 58px);
  font-weight: 660;
  line-height: 1.06;
  letter-spacing: -0.034em;
}

.instruction-lead {
  max-width: 680px;
  margin: 0;
  color: var(--muted);
  font-size: 21px;
  line-height: 1.58;
  letter-spacing: -0.01em;
}

.instruction-letter {
  display: grid;
  gap: 22px;
  padding-top: 44px;
}

.instruction-letter p {
  max-width: 720px;
  margin: 0;
  color: var(--ink-soft);
  font-size: 19px;
  line-height: 1.82;
  letter-spacing: -0.006em;
}

.instruction-letter p:first-child {
  color: var(--ink);
  font-weight: 700;
}

.instruction-letter a {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid rgba(230, 97, 55, 0.34);
  transition: color 0.2s ease, border-color 0.2s ease;
}

.instruction-letter a:hover {
  color: var(--accent);
  border-bottom-color: currentColor;
}

.instruction-signature {
  padding-top: 8px;
  color: var(--ink) !important;
  font-weight: 760;
}

.instruction-guide {
  display: grid;
  gap: 34px;
  min-width: 0;
  max-width: 100%;
  padding-top: 44px;
}

.instruction-copy {
  display: grid;
  gap: 18px;
  max-width: 760px;
}

.instruction-copy h3,
.instruction-note h3 {
  margin: 0;
  font-size: 26px;
  line-height: 1.16;
  letter-spacing: -0.026em;
}

.instruction-copy p,
.instruction-note p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 18px;
  line-height: 1.78;
  letter-spacing: -0.006em;
}

.instruction-steps {
  display: grid;
  gap: 0;
  max-width: 820px;
  margin: 4px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.instruction-steps li {
  display: grid;
  grid-template-columns: 54px minmax(0, 1fr);
  gap: 20px;
  align-items: start;
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
}

.instruction-steps span {
  color: var(--accent);
  font-size: 13px;
  font-weight: 780;
  letter-spacing: 0.12em;
}

.instruction-steps p {
  margin: 0;
  color: var(--ink);
  font-size: 18px;
  line-height: 1.62;
  letter-spacing: -0.008em;
}

.instruction-screenshot {
  width: 100%;
  max-width: 100%;
  min-width: 0;
  margin: 6px 0 0;
}

.instruction-screenshot img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 2880 / 1624;
  border: 1px solid var(--line);
  border-radius: 24px;
  box-shadow: 0 24px 70px rgba(28, 24, 20, 0.08);
  cursor: zoom-in;
}

.instruction-screenshot figcaption {
  margin: 14px 2px 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.5;
}

.screenshot-lightbox {
  position: fixed;
  inset: 0;
  z-index: 90;
  display: grid;
  place-items: center;
  padding: 58px 24px 28px;
  background: rgba(18, 17, 16, 0.78);
  backdrop-filter: blur(16px);
}

.screenshot-lightbox[hidden] {
  display: none;
}

.screenshot-lightbox img {
  display: block;
  max-width: min(1200px, 96vw);
  max-height: 86vh;
  border-radius: 18px;
  box-shadow: 0 28px 100px rgba(0, 0, 0, 0.34);
  object-fit: contain;
}

.screenshot-lightbox-close {
  position: fixed;
  top: 18px;
  right: 18px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  padding: 0;
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: 999px;
  color: #fff;
  background: rgba(255, 255, 255, 0.08);
  font-size: 28px;
  line-height: 1;
  cursor: pointer;
  backdrop-filter: blur(12px);
}

body.is-screenshot-lightbox-open {
  overflow: hidden;
}

.instruction-field-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  max-width: 900px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 24px;
  background: var(--line);
}

.instruction-field-grid div {
  min-height: 178px;
  padding: 24px;
  background: rgba(255, 255, 255, 0.68);
}

.instruction-field-grid span {
  display: block;
  margin-bottom: 18px;
  color: var(--accent);
  font-size: 13px;
  font-weight: 780;
  letter-spacing: 0.11em;
  text-transform: uppercase;
}

.instruction-field-grid p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 17px;
  line-height: 1.68;
  letter-spacing: -0.006em;
}

.instruction-note {
  display: grid;
  gap: 12px;
  max-width: 760px;
  padding: 26px 28px;
  border: 1px solid rgba(230, 97, 55, 0.22);
  border-radius: 24px;
  background: linear-gradient(135deg, rgba(230, 97, 55, 0.08), rgba(255, 255, 255, 0.52));
}

.instruction-warning {
  display: grid;
  gap: 12px;
  max-width: 820px;
  padding: 26px 28px;
  border: 1px solid rgba(32, 32, 30, 0.12);
  border-radius: 24px;
  background: rgba(32, 32, 30, 0.045);
}

.instruction-warning h3 {
  margin: 0;
  font-size: 24px;
  line-height: 1.18;
  letter-spacing: -0.024em;
}

.instruction-warning p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 18px;
  line-height: 1.72;
  letter-spacing: -0.006em;
}

.instruction-industry-hint {
  display: grid;
  grid-template-columns: 28px minmax(0, 1fr);
  gap: 18px;
  max-width: 820px;
  padding: 24px 26px;
  border: 1px solid rgba(60, 124, 255, 0.22);
  border-radius: 24px;
  background: linear-gradient(135deg, rgba(60, 124, 255, 0.08), rgba(255, 255, 255, 0.6));
}

.instruction-industry-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  margin-top: 2px;
  border: 1px solid rgba(60, 124, 255, 0.45);
  border-radius: 999px;
  color: #244aa8;
  font-size: 14px;
  font-weight: 800;
  font-family: var(--text);
}

.instruction-industry-hint h3 {
  margin: 0 0 10px;
  color: #244aa8;
  font-size: 22px;
  line-height: 1.18;
  letter-spacing: -0.02em;
}

.instruction-industry-hint p {
  margin: 0;
  color: #2e4c96;
  font-size: 17px;
  line-height: 1.62;
  letter-spacing: -0.006em;
}

.instruction-industry-hint ul {
  display: grid;
  gap: 8px;
  margin: 16px 0 0;
  padding: 0;
  list-style: none;
}

.instruction-industry-hint li {
  color: #244aa8;
  font-size: 17px;
  line-height: 1.45;
}

.instruction-industry-hint li::before {
  margin-right: 6px;
  font-weight: 800;
}

.instruction-industry-hint .is-right::before {
  content: "✓";
  color: #06805f;
}

.instruction-industry-hint .is-wrong::before {
  content: "×";
  color: #d3154f;
}

.instruction-industry-hint .is-right strong {
  color: #06805f;
}

.instruction-industry-hint .is-wrong strong {
  color: #d3154f;
}

.instruction-accordion {
  max-width: 900px;
  border: 1px solid var(--line);
  border-radius: 24px;
  background: rgba(255, 255, 255, 0.6);
  overflow: hidden;
}

.instruction-accordion summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  min-height: 74px;
  padding: 0 26px;
  cursor: pointer;
  list-style: none;
}

.instruction-accordion summary::-webkit-details-marker {
  display: none;
}

.instruction-accordion summary span {
  color: var(--ink);
  font-size: 19px;
  font-weight: 760;
  letter-spacing: -0.014em;
}

.instruction-accordion summary svg {
  width: 18px;
  height: 18px;
  flex: 0 0 auto;
  fill: none;
  stroke: var(--muted);
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
  transition: transform 0.2s ease;
}

.instruction-accordion[open] summary svg {
  transform: rotate(180deg);
}

.instruction-accordion-body {
  display: grid;
  gap: 26px;
  padding: 0 26px 28px;
  border-top: 1px solid var(--line);
}

.instruction-accordion-body > p {
  max-width: 760px;
  margin: 24px 0 0;
  color: var(--ink-soft);
  font-size: 18px;
  line-height: 1.72;
  letter-spacing: -0.006em;
}

.instruction-next-step {
  max-width: 760px;
  padding-top: 4px;
}

.instruction-next-step p {
  margin: 0;
  color: var(--muted);
  font-size: 17px;
  line-height: 1.72;
  letter-spacing: -0.006em;
}

.instruction-next-step a {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid rgba(230, 97, 55, 0.34);
  transition: color 0.2s ease, border-color 0.2s ease;
}

.instruction-next-step a:hover {
  color: var(--accent);
  border-bottom-color: currentColor;
}

.instruction-article + .instruction-article {
  margin-top: 46px;
}

.instruction-article-placeholder .instruction-header {
  padding: 0 0 28px;
}

.instruction-article-placeholder .instruction-eyebrow {
  margin-bottom: 10px;
  font-size: 12px;
}

.instruction-article-placeholder .instruction-header h2 {
  max-width: 680px;
  font-size: clamp(30px, 3.6vw, 42px);
  line-height: 1.12;
}

.instruction-article-placeholder .instruction-lead {
  color: var(--faint);
  font-size: 17px;
}

[data-reveal] {
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

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

@media (max-width: 1160px) {
  .article-system {
    grid-template-columns: minmax(0, var(--content)) var(--side);
    justify-content: center;
  }
}

@media (max-width: 920px) {
  .site-header {
    grid-template-columns: 1fr auto;
    gap: 14px;
  }

  body.is-instruction-menu-open {
    overflow: hidden;
  }

  .instructions-shell {
    grid-template-columns: 1fr;
    gap: 34px;
  }

  .instruction-mobile-menu-toggle {
    position: fixed;
    right: 18px;
    bottom: max(18px, env(safe-area-inset-bottom));
    z-index: 62;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    min-height: 46px;
    padding: 0 16px;
    border: 1px solid rgba(230, 97, 55, 0.28);
    border-radius: 999px;
    color: var(--ink);
    background: rgba(247, 245, 241, 0.94);
    box-shadow: 0 16px 42px rgba(28, 24, 20, 0.16);
    font: inherit;
    font-size: 14px;
    font-weight: 720;
    letter-spacing: -0.01em;
    cursor: pointer;
    backdrop-filter: blur(18px);
  }

  .instruction-mobile-menu-toggle svg {
    width: 18px;
    height: 18px;
    fill: none;
    stroke: var(--accent);
    stroke-linecap: round;
    stroke-width: 1.9;
  }

  .instruction-mobile-menu-toggle.is-active {
    border-color: rgba(230, 97, 55, 0.42);
    background: rgba(255, 245, 239, 0.97);
  }

  .instruction-mobile-menu-backdrop {
    position: fixed;
    inset: 0;
    z-index: 58;
    display: block;
    background: rgba(28, 24, 20, 0.18);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease;
    backdrop-filter: blur(2px);
  }

  .instruction-mobile-menu-backdrop[hidden] {
    display: none;
  }

  .is-instruction-menu-open .instruction-mobile-menu-backdrop {
    opacity: 1;
    pointer-events: auto;
  }

  .instructions-sidebar {
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
    z-index: 61;
    width: min(342px, calc(100vw - 52px));
    height: 100dvh;
    padding: 24px 18px 96px;
    overflow-y: auto;
    border-right: 1px solid var(--line);
    background: rgba(247, 245, 241, 0.98);
    box-shadow: 24px 0 80px rgba(28, 24, 20, 0.14);
    transform: translateX(-104%);
    transition: transform 0.22s ease;
    backdrop-filter: blur(18px);
    overscroll-behavior: contain;
  }

  .is-instruction-menu-open .instructions-sidebar {
    transform: translateX(0);
  }

  .instructions-sidebar-inner {
    gap: 18px;
    padding-top: 0;
  }

  .instructions-sidebar,
  .instruction-article,
  .instruction-empty-state {
    grid-column: 1;
  }

  .instructions-sidebar nav {
    display: grid;
    gap: 4px;
    overflow: visible;
    padding: 0;
  }

  .instructions-sidebar a {
    min-height: 38px;
    padding: 0 0 0 14px;
    border: 0;
    border-left: 1px solid var(--line);
    border-radius: 0;
    background: transparent;
    font-size: 15px;
  }

  .instruction-nav-parent {
    display: grid;
  }

  .instruction-nav-parent button {
    width: 18px;
    height: 32px;
    border: 0;
    border-radius: 0;
    background: transparent;
  }

  .instruction-nav-children {
    display: grid;
  }

  .instruction-nav-group {
    display: grid;
    gap: 2px;
  }

  .instructions-sidebar a:hover,
  .instructions-sidebar a.is-active {
    border-left-color: var(--accent);
    color: var(--ink);
    background: transparent;
  }

  .toc-panel {
    display: none;
  }

  .global-search.is-open,
  .global-search:focus-within {
    width: min(240px, 42vw);
  }

  .global-search.is-open input,
  .global-search:focus-within input {
    width: min(184px, 32vw);
  }

  .instruction-guide {
    gap: 28px;
    padding-top: 34px;
  }

  .instruction-copy h3,
  .instruction-note h3,
  .instruction-warning h3 {
    font-size: 23px;
  }

  .instruction-copy p,
  .instruction-note p,
  .instruction-warning p,
  .instruction-steps p {
    font-size: 17px;
  }

  .instruction-steps li {
    grid-template-columns: 42px minmax(0, 1fr);
    gap: 14px;
    padding: 18px 0;
  }

  .instruction-screenshot img,
  .instruction-field-grid,
  .instruction-warning,
  .instruction-accordion,
  .instruction-note {
    border-radius: 20px;
  }

  .instruction-field-grid {
    grid-template-columns: 1fr;
  }

  .instruction-field-grid div {
    min-height: 0;
    padding: 22px;
  }

  .instruction-field-grid p {
    font-size: 16px;
  }

  .instruction-note {
    padding: 22px;
  }

  .instruction-warning {
    padding: 22px;
  }

  .instruction-industry-hint {
    grid-template-columns: 1fr;
    gap: 12px;
    padding: 22px;
    border-radius: 20px;
  }

  .instruction-industry-hint h3 {
    font-size: 21px;
  }

  .instruction-industry-hint p,
  .instruction-industry-hint li {
    font-size: 16px;
  }

  .instruction-accordion summary {
    min-height: 66px;
    padding: 0 22px;
  }

  .instruction-accordion-body {
    padding: 0 22px 24px;
  }

  .article-system {
    grid-template-columns: 1fr;
  }

  .related-heading {
    align-items: flex-start;
    flex-direction: column;
  }

  .related-grid,
  .timeline {
    grid-template-columns: 1fr;
  }

  .timeline div {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .timeline div:last-child {
    border-bottom: 0;
  }

  .related-card,
  .related-card + .related-card {
    padding: 24px 0;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .related-card:last-child {
    border-bottom: 0;
  }

  .related-card svg {
    right: 0;
  }
}

@media (max-width: 680px) {
  main,
  .site-footer {
    width: calc(100% - 28px);
  }

  .articles-page {
    width: calc(100% - 28px);
    padding-top: 62px;
  }

  .instructions-shell {
    width: calc(100% - 28px);
    gap: 28px;
    padding: 42px 0 78px;
  }

  .instructions-sidebar p {
    font-size: 11px;
  }

  .instructions-sidebar {
    width: min(326px, calc(100vw - 42px));
    padding: 22px 16px 94px;
  }

  .instructions-sidebar a {
    min-height: 36px;
    padding: 0 0 0 13px;
    font-size: 13px;
  }

  .instructions-sidebar a.is-child {
    min-height: 36px;
    padding-left: 24px;
    font-size: 13px;
  }

  .instruction-nav-parent button {
    width: 18px;
    height: 32px;
  }

  .instruction-mobile-menu-toggle {
    right: 14px;
    min-height: 44px;
    padding: 0 14px;
  }

  .instruction-header {
    padding-bottom: 28px;
  }

  .instruction-header h1 {
    margin-bottom: 16px;
    font-size: clamp(42px, 13vw, 54px);
    line-height: 0.96;
  }

  .instruction-hello-title {
    gap: 0 0.14em;
  }

  .instruction-hello-title .hello-agent {
    margin: 0 -0.08em;
    font-size: 0.58em;
    transform: translateY(0.1em) rotate(10deg);
  }

  .instruction-hello-title .hello-agent::after {
    opacity: 0.72;
  }

  .instruction-lead {
    font-size: 18px;
    line-height: 1.54;
  }

  .instruction-letter {
    gap: 18px;
    padding-top: 30px;
  }

  .instruction-letter p {
    font-size: 16px;
    line-height: 1.72;
  }

  .instruction-guide {
    gap: 24px;
    padding-top: 30px;
  }

  .instruction-copy {
    gap: 14px;
  }

  .instruction-copy h3,
  .instruction-note h3,
  .instruction-warning h3 {
    font-size: 22px;
    letter-spacing: -0.02em;
  }

  .instruction-copy p,
  .instruction-note p,
  .instruction-warning p,
  .instruction-steps p,
  .instruction-accordion-body > p,
  .instruction-next-step p {
    font-size: 16px;
    line-height: 1.68;
  }

  .instruction-steps li {
    grid-template-columns: 34px minmax(0, 1fr);
    gap: 12px;
    padding: 16px 0;
  }

  .instruction-steps span {
    font-size: 12px;
    letter-spacing: 0.1em;
  }

  .instruction-screenshot {
    margin: 4px 0 0;
    padding: 0;
  }

  .instruction-screenshot img {
    width: 100%;
    max-width: 100%;
    border-radius: 18px;
    box-shadow: 0 18px 48px rgba(28, 24, 20, 0.08);
  }

  .instruction-screenshot figcaption {
    position: static;
    width: auto;
    margin: 11px 2px 0;
    font-size: 13px;
    line-height: 1.45;
  }

  .screenshot-lightbox {
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    padding: 64px 14px 24px;
    touch-action: none;
    -webkit-overflow-scrolling: touch;
  }

  .screenshot-lightbox img {
    width: auto;
    max-width: calc(100vw - 28px);
    max-height: calc(100dvh - 96px);
    border-radius: 12px;
    cursor: grab;
    transform: translate(var(--zoom-x, 0px), var(--zoom-y, 0px)) scale(var(--zoom-scale, 1));
    transform-origin: center;
    will-change: transform;
  }

  .screenshot-lightbox.is-zoomed img {
    cursor: grabbing;
  }

  .screenshot-lightbox-close {
    top: 12px;
    right: 12px;
  }

  .instruction-field-grid div,
  .instruction-note,
  .instruction-warning,
  .instruction-industry-hint,
  .instruction-accordion-body {
    padding: 18px;
  }

  .instruction-field-grid span {
    margin-bottom: 12px;
    font-size: 12px;
  }

  .instruction-field-grid p,
  .instruction-industry-hint p,
  .instruction-industry-hint li {
    font-size: 15px;
    line-height: 1.6;
  }

  .instruction-industry-hint h3 {
    font-size: 20px;
  }

  .instruction-accordion summary {
    min-height: 58px;
    padding: 0 18px;
  }

  .instruction-accordion summary span {
    font-size: 17px;
  }

  .instruction-accordion-body {
    gap: 20px;
  }

  .articles-hero {
    padding-bottom: 26px;
  }

  .articles-hero h1 {
    margin-bottom: 12px;
    font-size: clamp(42px, 13vw, 54px);
    line-height: 0.98;
  }

  .articles-hero p {
    font-size: 16px;
    line-height: 1.58;
  }

  .search-status {
    padding: 14px 0 0;
    border-bottom: 0;
  }

  .article-list-card {
    grid-template-columns: minmax(0, 1fr) 34px;
    gap: 14px;
    margin-top: 12px;
    padding: 22px 18px;
    border: 1px solid var(--line);
    border-radius: 24px;
    background: rgba(255, 255, 255, 0.46);
    box-shadow: 0 16px 48px rgba(28, 24, 20, 0.045);
  }

  .article-card-index {
    display: none;
  }

  .article-card-arrow {
    width: 34px;
    height: 34px;
    background: rgba(247, 245, 241, 0.68);
  }

  .article-list-card h2 {
    font-size: 24px;
    line-height: 1.15;
    letter-spacing: -0.024em;
  }

  .article-list-card p {
    font-size: 15px;
    line-height: 1.56;
  }

  .article-list-card time {
    font-size: 11px;
    letter-spacing: 0.1em;
  }

  .article-list-card:hover {
    transform: none;
  }

  .site-header {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 12px;
    padding: 12px 14px;
  }

  .brand-logo {
    width: 124px;
  }

  .brand-divider,
  .brand-descriptor {
    display: none;
  }

  .mobile-menu-toggle {
    display: inline-flex;
    position: relative;
    z-index: 42;
    align-items: center;
    justify-content: center;
    width: 42px;
    height: 42px;
    padding: 0;
    border: 1px solid var(--line);
    border-radius: 999px;
    color: var(--ink);
    background: rgba(255, 255, 255, 0.54);
    cursor: pointer;
    transition: border-color 0.18s ease, background 0.18s ease;
  }

  .mobile-menu-toggle span {
    position: absolute;
    width: 17px;
    height: 1.5px;
    border-radius: 999px;
    background: currentColor;
    transition: transform 0.2s ease;
  }

  .mobile-menu-toggle span:first-child {
    transform: translateY(-4px);
  }

  .mobile-menu-toggle span:last-child {
    transform: translateY(4px);
  }

  .mobile-menu-toggle.is-active {
    border-color: rgba(230, 97, 55, 0.34);
    background: rgba(230, 97, 55, 0.08);
  }

  .mobile-menu-toggle.is-active span:first-child {
    transform: rotate(42deg);
  }

  .mobile-menu-toggle.is-active span:last-child {
    transform: rotate(-42deg);
  }

  .header-actions {
    position: absolute;
    top: calc(100% + 8px);
    right: 14px;
    left: auto;
    z-index: 41;
    display: grid;
    width: min(360px, calc(100vw - 28px));
    gap: 0;
    align-items: stretch;
    justify-content: stretch;
    padding: 8px;
    border: 1px solid var(--line);
    border-radius: 22px;
    background: #fff;
    box-shadow: 0 24px 70px rgba(28, 24, 20, 0.12);
    opacity: 0;
    pointer-events: none;
    transform: translateY(-8px);
    transition: opacity 0.18s ease, transform 0.18s ease;
    backdrop-filter: blur(18px);
  }

  .is-mobile-menu-open .header-actions {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
  }

  .header-actions-divider {
    width: 100%;
    height: 1px;
    margin: 2px 0;
  }

  .articles-link,
  .docs-link,
  .site-link {
    justify-content: space-between;
    min-height: 46px;
    padding: 0 12px;
    color: var(--ink);
    border-radius: 14px;
    font-size: 15px;
  }

  .articles-link:hover,
  .docs-link:hover,
  .site-link:hover {
    background: rgba(230, 97, 55, 0.06);
  }

  .global-search {
    justify-content: flex-start;
    width: 100%;
    min-height: 48px;
    padding: 0 8px;
  }

  .global-search,
  .global-search.is-open,
  .global-search:focus-within {
    width: 100%;
  }

  .global-search input,
  .global-search.is-open input,
  .global-search:focus-within input {
    width: 100%;
    opacity: 1;
    border-color: var(--line);
  }

  .article-system {
    gap: 0;
    padding: 54px 0 72px;
  }

  .article h1 {
    font-size: clamp(34px, 10.6vw, 40px);
    line-height: 1.08;
    letter-spacing: -0.032em;
  }

  .dek,
  .article .lead,
  .note p {
    font-size: 18px;
    line-height: 1.62;
  }

  .article-footer-actions {
    align-items: flex-start;
    flex-direction: column;
    gap: 14px;
  }

  .article-toolbar {
    align-items: flex-start;
    flex-direction: row;
    justify-content: space-between;
    gap: 14px;
    margin-top: 22px;
    padding-top: 14px;
  }

  .article-toolbar div {
    display: flex;
    flex-wrap: wrap;
    flex: 1 1 auto;
    gap: 6px 0;
  }

  .article-toolbar div span + span::before {
    display: inline-block;
    width: 3px;
    height: 3px;
    margin: 0 10px;
  }

  .copy-link {
    position: relative;
    flex: 0 0 auto;
    width: 40px;
    min-width: 40px;
    min-height: 40px;
    padding: 0;
    border: 1px solid var(--line);
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.42);
    color: var(--muted);
    font-size: 0;
  }

  .copy-link::before,
  .copy-link::after {
    content: "";
    position: absolute;
    left: 50%;
    top: 50%;
    width: 13px;
    height: 15px;
    border: 1.5px solid currentColor;
    border-radius: 4px;
  }

  .copy-link::before {
    transform: translate(-42%, -58%);
    background: rgba(247, 245, 241, 0.96);
  }

  .copy-link::after {
    transform: translate(-62%, -38%);
  }

  .copy-link.is-copied {
    color: var(--accent);
    background: rgba(230, 97, 55, 0.08);
  }

  .copy-link.is-copied::before {
    content: "✓";
    display: grid;
    place-items: center;
    width: auto;
    height: auto;
    border: 0;
    background: transparent;
    font-size: 18px;
    font-weight: 760;
    line-height: 1;
    transform: translate(-50%, -50%);
  }

  .copy-link.is-copied::after {
    display: none;
  }

  .network-map {
    grid-template-columns: 1fr;
    gap: 0;
    padding: 18px;
    border-radius: 24px;
    background:
      linear-gradient(180deg, rgba(255, 255, 255, 0.9), rgba(250, 247, 243, 0.94)),
      rgba(255, 255, 255, 0.96);
    box-shadow: 0 18px 58px rgba(28, 24, 20, 0.055);
  }

  .map-path {
    width: 2px;
    min-width: 1px;
    height: 28px;
    margin: 0 0 0 25px;
    background: rgba(221, 107, 42, 0.18);
  }

  .map-path span {
    width: 2px;
    height: 100%;
    background: rgba(221, 107, 42, 0.44);
  }

  .map-path::after {
    right: -3.5px;
    top: auto;
    bottom: 0;
    border-color: rgba(221, 107, 42, 0.44);
    transform: rotate(135deg);
  }

  .map-node {
    grid-template-columns: 52px minmax(0, 1fr);
    gap: 0 14px;
    min-height: 0;
    padding: 17px 0;
    border: 0;
    border-radius: 0;
    background: transparent;
    box-shadow: none;
  }

  .map-node.main {
    background: transparent;
    box-shadow: none;
  }

  .map-node span {
    grid-row: 1 / span 2;
    display: grid;
    place-items: center;
    width: 52px;
    height: 52px;
    border: 1px solid rgba(221, 107, 42, 0.2);
    border-radius: 50%;
    color: var(--accent);
    background: rgba(255, 246, 239, 0.82);
  }

  .map-node strong {
    align-self: end;
    font-size: 22px;
  }

  .map-node small {
    align-self: start;
    max-width: 260px;
  }

  .map-output {
    display: grid;
    gap: 8px;
    margin-top: 8px;
    padding: 16px 18px;
    border: 0;
    border-radius: 18px;
    background: var(--dark);
  }

  .map-output span,
  .map-output strong {
    color: #fff;
    text-align: left;
  }

  .map-output span {
    opacity: 0.58;
  }

  .concept-list div {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .article p {
    font-size: 16.5px;
    line-height: 1.76;
  }

  .article h3 {
    font-size: 26px;
    line-height: 1.18;
  }

  .content-section {
    margin-top: 38px;
  }

  .summary-box,
  .note,
  .network-map,
  .timeline {
    border-radius: 18px;
  }

  blockquote {
    margin-top: 42px;
    padding: 22px 0 22px 18px;
    font-size: 25px;
  }

  .button {
    width: 100%;
    min-height: 48px;
  }

  .related {
    padding: 42px 0 66px;
  }

  .related-heading h2 {
    font-size: 28px;
  }

  .related-grid h3 {
    padding-right: 42px;
    font-size: 22px;
  }
}