.nodes-hero {
  position: relative;
  padding-top: clamp(58px, 8vw, 104px);
  padding-bottom: clamp(56px, 8vw, 96px);
  overflow: hidden;
  border-bottom: 1px solid var(--color-border);
  background:
    radial-gradient(circle at 18% 4%, var(--color-glow), var(--color-transparent) 34%),
    linear-gradient(180deg, var(--color-bg-deep), var(--color-bg));
}

.nodes-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--color-grid-strong) 1px, var(--color-transparent) 1px),
    linear-gradient(90deg, var(--color-grid-strong) 1px, var(--color-transparent) 1px);
  background-size: 48px 48px;
  mask-image: linear-gradient(to bottom, var(--color-text), var(--color-transparent));
  pointer-events: none;
}

.nodes-hero .wrap {
  position: relative;
  z-index: 1;
}

.nodes-hero-copy {
  max-width: 920px;
  margin-inline: auto;
  text-align: center;
}

.nodes-hero h1 {
  max-width: 920px;
  margin: 18px auto 0;
}

.nodes-lead {
  max-width: 780px;
  margin: 22px auto 0;
  font-size: clamp(16px, 1.8vw, 20px);
}

.nodes-hero-actions {
  justify-content: center;
  margin-top: 28px;
}

.nodes-hero-actions .button {
  min-width: 150px;
}

.nodes-fact-row {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 22px;
}

.nodes-topology {
  position: relative;
  max-width: 1080px;
  min-height: 390px;
  margin: 54px auto 0;
  overflow: hidden;
  border: 1px solid var(--color-border-bright);
  border-radius: var(--radius-xl);
  background:
    radial-gradient(circle at 22% 20%, var(--color-glow), var(--color-transparent) 32%),
    linear-gradient(145deg, var(--color-panel-raised), var(--color-bg-deep));
  box-shadow: var(--shadow-panel), var(--shadow-inset);
}

.nodes-topology-head,
.nodes-topology-foot {
  position: absolute;
  z-index: 2;
  right: 22px;
  left: 22px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--color-text-dim);
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.1em;
}

.nodes-topology-head {
  top: 18px;
}

.nodes-topology-foot {
  bottom: 18px;
  justify-content: flex-start;
  gap: 20px;
}

.nodes-topology-foot span {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.topology-key {
  width: 8px;
  height: 8px;
  flex: 0 0 auto;
  border: 1px solid var(--color-border-bright);
  border-radius: var(--radius-pill);
  background: var(--color-panel);
}

.topology-key-active {
  border-color: var(--color-accent);
  background: var(--color-accent);
  box-shadow: 0 0 12px var(--color-accent);
}

.nodes-map {
  width: 100%;
  height: 390px;
}

.map-grid-line {
  fill: none;
  stroke: var(--color-grid-strong);
  stroke-width: 1;
  vector-effect: non-scaling-stroke;
}

.map-route {
  fill: none;
  stroke: var(--color-accent-dark);
  stroke-width: 1.4;
  stroke-dasharray: 7 9;
  opacity: 0.82;
  vector-effect: non-scaling-stroke;
}

.map-route-soft {
  stroke: var(--color-border-bright);
  opacity: 0.58;
}

.map-route-short {
  stroke-width: 1;
  opacity: 0.64;
}

.map-ring {
  fill: var(--color-glow-soft);
  stroke: var(--color-accent);
  stroke-width: 1;
}

.map-node-shell {
  fill: var(--color-panel-raised);
  stroke: var(--color-border-bright);
  stroke-width: 1.5;
}

.map-node-selected .map-node-shell {
  stroke: var(--color-accent);
}

.map-node-core {
  fill: var(--color-accent);
}

.map-label {
  fill: var(--color-text-muted);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.12em;
}

.map-label-active {
  fill: var(--color-accent);
}

.nodes-document {
  position: relative;
  padding-top: 38px;
  padding-bottom: var(--section-space);
}

.nodes-section {
  padding-top: clamp(72px, 9vw, 120px);
  padding-bottom: clamp(72px, 9vw, 120px);
  border-bottom: 1px solid var(--color-border);
}

.nodes-section:last-child {
  border-bottom: 0;
}

.coverage-notes {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  margin-top: 26px;
}

.coverage-notes p {
  margin-bottom: 0;
  padding: 20px;
  border-left: 1px solid var(--color-border-bright);
  background: linear-gradient(90deg, var(--color-highlight), var(--color-transparent));
}

.route-browser {
  display: grid;
  grid-template-columns: minmax(180px, 230px) minmax(0, 1fr);
  gap: clamp(24px, 5vw, 72px);
  align-items: start;
}

.route-type-index {
  position: sticky;
  top: calc(var(--toc-top) + 72px);
  display: grid;
  border-top: 1px solid var(--color-border-bright);
}

.route-type-index-label {
  padding: 16px 12px;
  color: var(--color-text-dim);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.13em;
}

.route-type-index a {
  display: grid;
  padding: 15px 12px;
  border-top: 1px solid var(--color-border);
  color: var(--color-text-muted);
  transition:
    color var(--transition-fast),
    background-color var(--transition-fast);
}

.route-type-index a:hover {
  color: var(--color-text);
  background: var(--color-highlight);
}

.route-type-index a span {
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
}

.route-type-content {
  min-width: 0;
}

.route-type-panel {
  scroll-margin-top: calc(var(--toc-top) + 90px);
  padding: clamp(24px, 4vw, 40px);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background:
    linear-gradient(145deg, var(--color-highlight), var(--color-transparent)),
    var(--color-panel);
  box-shadow: var(--shadow-inset);
}

.route-type-panel + .route-type-panel {
  margin-top: 22px;
}

.route-type-panel h3 {
  margin-bottom: 18px;
  font-family: var(--font-display);
  font-size: clamp(27px, 3.2vw, 38px);
  font-weight: 500;
}

.route-type-panel p:last-child {
  margin-bottom: 0;
}

.route-type-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 22px;
  padding-bottom: 13px;
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text-dim);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
}

.route-type-meta span:first-child {
  color: var(--color-accent);
}

.use-case-list {
  border-top: 1px solid var(--color-border-bright);
}

.use-case {
  display: grid;
  grid-template-columns: minmax(170px, 0.75fr) minmax(0, 2fr);
  gap: clamp(24px, 5vw, 72px);
  padding-top: 34px;
  padding-bottom: 34px;
  border-bottom: 1px solid var(--color-border);
}

.use-case-label span {
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
}

.use-case-label h3 {
  margin: 8px 0 0;
  font-family: var(--font-display);
  font-weight: 500;
}

.use-case-body {
  max-width: 760px;
}

.use-case-body p:last-child {
  margin-bottom: 0;
}

.switch-sequence {
  margin: 0;
  padding: 0;
  display: grid;
  list-style: none;
  counter-reset: switch-step;
}

.switch-sequence li {
  position: relative;
  min-height: 104px;
  padding: 26px 26px 26px 92px;
  border-top: 1px solid var(--color-border);
  counter-increment: switch-step;
}

.switch-sequence li:last-child {
  border-bottom: 1px solid var(--color-border);
}

.switch-sequence li::before {
  content: counter(switch-step);
  position: absolute;
  top: 26px;
  left: 24px;
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  border: 1px solid var(--color-border-bright);
  border-radius: var(--radius-pill);
  color: var(--color-accent);
  background: var(--color-highlight);
  font-family: var(--font-mono);
  box-shadow: var(--shadow-inset);
}

.switch-sequence strong {
  display: block;
  margin-bottom: 7px;
  font-size: 1.04rem;
}

.switch-sequence p {
  max-width: 820px;
  margin-bottom: 0;
}

.principle-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.65fr) minmax(260px, 0.85fr);
  gap: clamp(28px, 6vw, 80px);
  align-items: start;
}

.principle-copy h3 {
  margin-top: 34px;
  margin-bottom: 10px;
  font-family: var(--font-display);
  font-weight: 500;
}

.principle-copy h3:first-child {
  margin-top: 0;
}

.principle-summary {
  position: sticky;
  top: calc(var(--toc-top) + 72px);
  padding: 24px;
  border: 1px solid var(--color-border-bright);
  border-radius: var(--radius-lg);
  background:
    radial-gradient(circle at 10% 0%, var(--color-glow-soft), var(--color-transparent) 38%),
    var(--color-panel-raised);
  box-shadow: var(--shadow-card), var(--shadow-inset);
}

.principle-summary-label {
  display: block;
  margin-bottom: 18px;
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
}

.principle-summary dl {
  margin: 0;
}

.principle-summary dl div {
  padding-top: 15px;
  padding-bottom: 15px;
  border-top: 1px solid var(--color-border);
}

.principle-summary dt {
  margin-bottom: 4px;
  color: var(--color-text);
  font-weight: 700;
}

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

.nodes-closing {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 32px;
  margin-top: 72px;
  padding: clamp(28px, 5vw, 48px);
  border: 1px solid var(--color-border-bright);
  border-radius: var(--radius-xl);
  background:
    radial-gradient(circle at 12% 0%, var(--color-glow), var(--color-transparent) 40%),
    var(--color-panel-raised);
  box-shadow: var(--shadow-panel);
}

.nodes-closing > div:first-child {
  max-width: 700px;
}

.nodes-closing h2 {
  margin: 10px 0 12px;
  font-size: clamp(30px, 4vw, 46px);
}

.nodes-closing p {
  margin-bottom: 0;
}

.nodes-closing .button-row {
  flex: 0 0 auto;
}

@media (max-width: 980px) {
  .coverage-notes {
    grid-template-columns: 1fr;
  }

  .route-browser {
    grid-template-columns: 1fr;
  }

  .route-type-index {
    position: static;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    overflow: hidden;
  }

  .route-type-index-label {
    grid-column: 1 / -1;
  }

  .route-type-index a {
    border-right: 1px solid var(--color-border);
  }

  .route-type-index a:last-child {
    border-right: 0;
  }

  .principle-layout {
    grid-template-columns: 1fr;
  }

  .principle-summary {
    position: static;
  }

  .nodes-closing {
    align-items: flex-start;
    flex-direction: column;
  }
}

@media (max-width: 768px) {
  .nodes-hero {
    padding-top: 44px;
  }

  .nodes-topology {
    min-height: 330px;
    margin-top: 40px;
    border-radius: var(--radius-lg);
  }

  .nodes-map {
    width: 150%;
    height: 330px;
    transform: translateX(-17%);
  }

  .nodes-topology-head span:last-child {
    display: none;
  }

  .nodes-topology-foot {
    gap: 12px;
    font-size: 0.58rem;
  }

  .use-case {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .route-type-meta {
    align-items: flex-start;
    flex-direction: column;
    gap: 5px;
  }
}

@media (max-width: 640px) {
  .nodes-document {
    padding-top: 24px;
  }

  .nodes-fact-row {
    align-items: center;
  }

  .nodes-topology {
    min-height: 290px;
  }

  .nodes-map {
    width: 180%;
    height: 290px;
    transform: translateX(-25%);
  }

  .nodes-topology-head {
    right: 15px;
    left: 15px;
  }

  .nodes-topology-foot {
    right: 15px;
    bottom: 13px;
    left: 15px;
    flex-wrap: wrap;
  }

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

  .route-type-index-label {
    grid-column: auto;
  }

  .route-type-index a {
    border-right: 0;
  }

  .route-type-panel {
    padding: 22px 18px;
  }

  .switch-sequence li {
    padding: 78px 18px 24px;
  }

  .switch-sequence li::before {
    top: 22px;
    left: 18px;
  }

  .nodes-closing {
    margin-top: 54px;
    padding: 24px 20px;
  }

  .nodes-closing .button-row {
    width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .nodes-map {
    transform: none;
  }
}