.road-building-page {
  background: var(--color-paper-050);
}

.road-building-page a:not(.button) {
  color: var(--color-blueprint-900);
  font-weight: 700;
  text-decoration-color: var(--color-construction-500);
}

.road-building-page a:not(.button):hover {
  color: var(--color-blueprint-700);
}

.rb-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(var(--space-7), 8vw, var(--space-10));
  background-image: linear-gradient(rgba(118, 183, 193, .09) 1px, transparent 1px), linear-gradient(90deg, rgba(118, 183, 193, .09) 1px, transparent 1px);
  background-size: 36px 36px;
}

.rb-hero__grid,
.rb-machines__grid,
.rb-dependencies__grid,
.rb-progression__grid,
.rb-environment__grid,
.rb-closeout__grid {
  display: grid;
  min-width: 0;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--space-5);
}

.rb-hero__title-field {
  grid-column: span 7;
  min-width: 0;
  max-width: 43.75rem;
}

.rb-hero__rail {
  grid-column: span 2;
  min-width: 0;
  align-self: start;
  padding: var(--space-4);
  border: 1px solid var(--border-dark);
  font-size: var(--text-small);
  line-height: 1.5;
}

.rb-hero__rail p {
  margin-bottom: var(--space-3);
}

.rb-hero__rail-rule {
  width: 100%;
  height: 2px;
  margin-block: var(--space-4);
  background: var(--color-construction-500);
}

.rb-hero__media {
  grid-column: span 3;
  min-width: 0;
  margin: 0;
}

.rb-hero__media img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  border: 1px solid var(--border-dark);
}

.rb-hero__media figcaption {
  color: var(--color-blueprint-050);
}

.rb-hero__actions {
  margin-top: var(--space-5);
}

.rb-hero__continuation {
  margin-top: var(--space-3);
  margin-bottom: 0;
  color: var(--color-blueprint-050);
  font-size: var(--text-small);
}

.rb-route__heading,
.rb-controls__heading,
.rb-notes__heading,
.rb-fit__heading {
  width: min(100%, 43.75rem);
  margin-bottom: var(--space-7);
}

.rb-route__stages {
  display: grid;
  min-width: 0;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--space-4);
  margin: 0;
  padding: 0;
  list-style: none;
}

.rb-stage {
  min-width: 0;
  padding: var(--space-5);
  border: 1px solid var(--border-light);
  border-top: 2px solid var(--color-construction-500);
  background: var(--color-blueprint-050);
  transition: border-color var(--transition-fast), transform var(--transition-fast);
}

.rb-stage--lower { transform: translateY(var(--space-5)); }
.rb-stage--lowest { transform: translateY(var(--space-7)); }
.rb-stage--finish { transform: translateY(var(--space-5)); background: var(--color-blueprint-900); color: var(--color-paper-050); border-color: var(--border-dark); }
.rb-stage:hover, .rb-stage:focus-within { border-color: var(--color-construction-500); }
.rb-stage__number { display: block; margin-bottom: var(--space-4); color: var(--color-blueprint-700); font-family: var(--font-heading); font-size: 2.5rem; line-height: 1; }
.rb-stage--finish .rb-stage__number { color: var(--color-construction-500); }
.rb-stage__tags { margin-bottom: 0; color: var(--color-blueprint-700); font-size: var(--text-small); font-weight: 700; }

.rb-machines__intro { grid-column: span 4; min-width: 0; }
.rb-machines__media { margin: var(--space-6) 0 0; }
.rb-machines__media img { width: 100%; aspect-ratio: 3 / 2; object-fit: cover; border: 1px solid var(--border-light); }
.rb-machine-ledger { grid-column: span 8; display: flex; min-width: 0; flex-direction: column; border-top: 1px solid var(--border-light); }
.rb-machine-record { display: grid; min-width: 0; grid-template-columns: minmax(8.75rem, 2fr) minmax(0, 6fr); gap: var(--space-5); padding-block: var(--space-5); border-bottom: 1px solid var(--border-light); }
.rb-machine-record__label, .rb-machine-record__copy { min-width: 0; }
.rb-machine-record__label span { display: block; color: var(--color-construction-500); font-family: var(--font-heading); font-size: 1.75rem; line-height: 1; }
.rb-machine-record__label p { margin: var(--space-2) 0 0; color: var(--color-blueprint-700); font-size: var(--text-small); font-weight: 700; letter-spacing: .08em; text-transform: uppercase; }
.rb-machine-record__copy { max-width: 31.25rem; }
.rb-machine-record__copy p:last-of-type { margin-bottom: var(--space-3); }
.rb-machine-record--context { background: rgba(246, 244, 238, .45); }

.rb-dependencies__content { grid-column: span 7; min-width: 0; max-width: 43.75rem; }
.rb-dependencies__drafting { grid-column: span 5; min-width: 0; background-image: linear-gradient(90deg, transparent 49%, rgba(18, 55, 70, .18) 50%, transparent 51%); background-size: 48px 100%; }
.rb-note-stack { display: flex; min-width: 0; flex-direction: column; gap: var(--space-5); }
.rb-field-note { display: grid; min-width: 0; grid-template-columns: 5rem minmax(0, 1fr); gap: var(--space-4); padding: var(--space-5) 0 var(--space-5) var(--space-4); border-left: 2px solid var(--color-construction-500); }
.rb-field-note__number { min-width: 0; color: var(--color-blueprint-700); font-family: var(--font-heading); font-size: 3rem; line-height: .9; }
.rb-field-note > div { min-width: 0; max-width: 35rem; }

.rb-controls { background-image: linear-gradient(rgba(18, 55, 70, .06) 1px, transparent 1px), linear-gradient(90deg, rgba(18, 55, 70, .06) 1px, transparent 1px); background-size: 40px 40px; }
.rb-controls__grid { display: grid; min-width: 0; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--space-4); }
.rb-control-panel { min-width: 0; padding: var(--space-5); border: 1px solid rgba(18, 55, 70, .28); background: rgba(246, 244, 238, .72); transition: border-color var(--transition-fast); }
.rb-control-panel:hover, .rb-control-panel:focus-within { border-color: var(--color-construction-500); }
.rb-control-panel__mark { display: block; width: 2rem; height: 2rem; margin-bottom: var(--space-4); border: 2px solid var(--color-blueprint-700); border-radius: 50%; position: relative; }
.rb-control-panel__mark::after { content: ""; position: absolute; top: 50%; left: 50%; width: .4rem; height: .4rem; background: var(--color-construction-500); transform: translate(-50%, -50%); }
.rb-control-panel__limit { margin-bottom: 0; padding-top: var(--space-3); border-top: 1px solid var(--border-light); color: var(--color-graphite-500); font-size: var(--text-small); }

.rb-progression__primary { grid-column: span 7; min-width: 0; max-width: 43.75rem; }
.rb-progression__insets { grid-column: span 5; display: flex; min-width: 0; flex-direction: column; gap: var(--space-4); }
.rb-progression-inset { min-width: 0; max-width: 30rem; padding: var(--space-5); border: 1px solid var(--border-light); background: var(--color-blueprint-050); }
.rb-progression-inset--dark { background: var(--color-blueprint-900); border-color: var(--border-dark); color: var(--color-paper-050); }
.rb-progression-inset--dark a { color: var(--color-construction-300) !important; }

.rb-environment__heading { width: min(100%, 43.75rem); margin-bottom: var(--space-7); }
.rb-environment__media { grid-column: span 7; min-width: 0; margin: 0; }
.rb-environment__media img { width: 100%; aspect-ratio: 16 / 10; object-fit: cover; border: 1px solid var(--border-light); }
.rb-environment__content { grid-column: span 5; display: flex; min-width: 0; flex-direction: column; gap: var(--space-5); }
.rb-environment__content > article { min-width: 0; }
.rb-environment__annotation { padding: var(--space-4); border-left: 2px solid var(--color-construction-500); background: rgba(246, 244, 238, .55); }
.rb-environment__boundary { padding: var(--space-4); border: 1px solid var(--color-signal-red-600); }
.rb-environment__boundary .technical-label { color: var(--color-signal-red-600); }
.rb-environment__boundary .technical-label::before { background: var(--color-signal-red-600); }

.rb-guide-grid { display: grid; min-width: 0; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--space-5); margin: 0; padding: 0; list-style: none; }
.rb-guide-step { display: grid; min-width: 0; grid-template-columns: 4.5rem minmax(0, 1fr); gap: var(--space-4); padding: var(--space-5); border-top: 2px solid var(--color-construction-500); background: var(--color-blueprint-050); }
.rb-guide-step > span { min-width: 0; color: var(--color-blueprint-700); font-family: var(--font-heading); font-size: 3rem; line-height: .9; }
.rb-guide-step > div { min-width: 0; max-width: 35rem; }
.rb-guide-step__links { display: flex; min-width: 0; flex-wrap: wrap; gap: var(--space-3); margin-top: var(--space-4); }

.rb-fit__grid { display: grid; min-width: 0; grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); gap: var(--space-4); }
.rb-fit__panel { min-width: 0; padding: var(--space-6); border: 1px solid var(--border-light); background: var(--color-paper-050); }
.rb-fit__panel > * { max-width: 28.75rem; }
.rb-fit__panel--dark { border-color: var(--border-dark); background: var(--color-blueprint-900); color: var(--color-paper-050); }
.rb-fit__panel--dark a { color: var(--color-construction-300) !important; }
.rb-fit__boundary { margin-top: var(--space-4); padding: var(--space-3) var(--space-4); border: 1px solid var(--border-light); font-size: var(--text-small); line-height: 1.5; }

.rb-closeout { position: relative; overflow: hidden; background-image: linear-gradient(90deg, rgba(118, 183, 193, .1) 1px, transparent 1px); background-size: 48px 100%; }
.rb-closeout__content { grid-column: span 7; display: flex; min-width: 0; flex-direction: column; align-items: flex-start; gap: var(--space-4); max-width: 38.75rem; }
.rb-closeout__content h2, .rb-closeout__content p { margin: 0; }
.rb-closeout__drafting { grid-column: span 5; min-width: 0; border-top: 2px solid var(--color-construction-500); align-self: center; }

[data-rb-reveal] { opacity: 0; transform: translateY(10px); }
[data-rb-reveal].rb-is-ready { opacity: 1; transform: translateY(0); transition: opacity 220ms ease-out, transform 220ms ease-out; }

@media (max-width: 66.25rem) {
  .rb-hero__grid { grid-template-columns: repeat(8, minmax(0, 1fr)); }
  .rb-hero__title-field { grid-column: span 5; }
  .rb-hero__rail { grid-column: 1 / span 5; grid-row: 2; max-width: 43.75rem; }
  .rb-hero__media { grid-column: 6 / span 3; grid-row: 1 / span 2; }
}

@media (max-width: 61.25rem) {
  .rb-route__stages { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .rb-stage--lowest, .rb-stage--lower, .rb-stage--finish { transform: none; }
  .rb-machines__grid, .rb-progression__grid { grid-template-columns: repeat(8, minmax(0, 1fr)); }
  .rb-machines__intro { grid-column: span 8; }
  .rb-machine-ledger { grid-column: span 8; }
  .rb-progression__primary, .rb-progression__insets { grid-column: span 8; }
  .rb-progression__insets { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .rb-progression-inset { max-width: none; }
}

@media (max-width: 56.25rem) {
  .rb-dependencies__grid, .rb-environment__grid { grid-template-columns: repeat(8, minmax(0, 1fr)); }
  .rb-dependencies__content, .rb-environment__media, .rb-environment__content { grid-column: span 8; }
  .rb-dependencies__drafting { display: none; }
  .rb-controls__grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .rb-control-panel--wide-tablet { grid-column: span 2; }
  .rb-fit__grid { grid-template-columns: 1fr; }
}

@media (max-width: 52.5rem) {
  .rb-guide-grid { grid-template-columns: 1fr; }
}

@media (max-width: 50rem) {
  .rb-closeout__grid { grid-template-columns: 1fr; }
  .rb-closeout__content { grid-column: 1; }
  .rb-closeout__drafting { display: none; }
}

@media (max-width: 43.75rem) {
  .rb-hero { background-size: 56px 56px; }
  .rb-hero__grid, .rb-machines__grid, .rb-dependencies__grid, .rb-progression__grid, .rb-environment__grid { grid-template-columns: 1fr; gap: var(--space-5); }
  .rb-hero__title-field, .rb-hero__rail, .rb-hero__media, .rb-machines__intro, .rb-machine-ledger, .rb-dependencies__content, .rb-progression__primary, .rb-progression__insets, .rb-environment__media, .rb-environment__content { grid-column: 1; grid-row: auto; max-width: none; }
  .rb-hero__rail { order: 2; }
  .rb-hero__media { order: 3; }
  .rb-route__heading, .rb-controls__heading, .rb-notes__heading, .rb-fit__heading, .rb-environment__heading { width: 100%; margin-bottom: var(--space-6); }
  .rb-route__stages, .rb-controls__grid, .rb-progression__insets { grid-template-columns: 1fr; }
  .rb-stage { transform: none; }
  .rb-stage:not(:last-child) { border-bottom: 0; }
  .rb-machine-record { grid-template-columns: 1fr; gap: var(--space-3); padding: var(--space-4) 0; }
  .rb-machine-record__copy { max-width: none; }
  .rb-field-note, .rb-guide-step { grid-template-columns: 1fr; gap: var(--space-3); }
  .rb-field-note { padding-left: var(--space-4); }
  .rb-field-note__number, .rb-guide-step > span { font-size: 2.5rem; }
  .rb-control-panel--wide-tablet { grid-column: auto; }
  .rb-fit__panel { padding: var(--space-5); }
  .rb-closeout { background-image: none; }
}

@media (prefers-reduced-motion: reduce) {
  [data-rb-reveal], [data-rb-reveal].rb-is-ready { opacity: 1; transform: none; transition: none; }
  .rb-stage { transition: none; }
}