:root {
  --accent: #4f8f27;
  --accent-dark: #38691a;
  --accent-ink: #102009;
  --accent-soft: #e5efd9;
  --alarm: #e85d57;
  --alarm-soft: #f6dfdd;
  --canvas: #fff;
  --figure: #f2f2ef;
  --ink: #181817;
  --line: #deded8;
  --muted: #6c6c67;
  --reading: 42rem;
  --soft: #fafaf8;
  --wide: 68rem;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--canvas);
  color: var(--ink);
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  background: var(--canvas);
  color: var(--ink);
  font-family: Arial, "Helvetica Neue", Helvetica, sans-serif;
  -moz-osx-font-smoothing: grayscale;
  -webkit-font-smoothing: antialiased;
  margin: 0;
}

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

a {
  border-bottom: 0;
  color: inherit;
  text-decoration: underline;
  text-decoration-color: #a3a39d;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

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

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

.skip {
  background: var(--ink);
  color: #fff;
  left: 1rem;
  padding: 0.75rem 1rem;
  position: fixed;
  top: -5rem;
  z-index: 20;
}

.skip:focus {
  top: 1rem;
}

.site-header {
  align-items: center;
  border-bottom: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  font-size: 0.82rem;
  gap: 1.25rem;
  justify-content: space-between;
  margin: 0 auto;
  max-width: 90rem;
  padding: 1.15rem clamp(1.25rem, 4vw, 3rem);
}

.site-header a {
  text-decoration: none;
}

.site-header strong {
  font-size: 0.9rem;
  letter-spacing: -0.01em;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.5rem;
  justify-content: flex-end;
}

.article-head {
  margin: 0 auto;
  max-width: 64rem;
  padding: clamp(5rem, 12vw, 10rem) 1.25rem clamp(4rem, 9vw, 7rem);
  text-align: center;
}

.article-head h1 {
  font-size: var(--type-display);
  font-weight: 500;
  letter-spacing: -0.075em;
  line-height: 0.92;
  margin: 0;
  text-wrap: balance;
}

.dek {
  color: #4c4c48;
  font-size: clamp(1.15rem, 2vw, 1.45rem);
  letter-spacing: -0.02em;
  line-height: 1.45;
  margin: 2.25rem auto 0;
  max-width: 40rem;
  text-wrap: balance;
}

.byline {
  align-items: center;
  display: flex;
  font-size: 0.84rem;
  gap: 0.65rem;
  justify-content: center;
  margin-top: 2rem;
}

.byline-org::before {
  content: "•";
  margin-right: 0.65rem;
}

.gate-wall {
  margin: 0 auto;
  max-width: var(--reading);
  padding: 0 1.25rem 7rem;
}

.gate-wall p {
  font-size: 1.08rem;
  letter-spacing: -0.012em;
  line-height: 1.55;
  margin: 0;
}

.gate-locked main > *:not(.article-head):not(.gate-wall) {
  display: none;
}

.gate-locked main > .article-head.article-head {
  display: block;
  padding-bottom: 3rem;
}

.gate-locked .gate-wall {
  display: grid;
  gap: 1rem;
  justify-items: start;
  margin: 0 auto;
  max-width: var(--reading);
  padding: 0 1.25rem 7rem;
}

.hero-figure,
.wide-figure {
  margin: 0 auto;
  max-width: var(--wide);
  padding-inline: 1.25rem;
}

.hero-stage {
  align-items: center;
  background: var(--figure);
  display: flex;
  justify-content: center;
  min-height: clamp(28rem, 64vw, 44rem);
  overflow: hidden;
  padding: clamp(1.5rem, 6vw, 5rem);
  position: relative;
}

.hero-stage::before {
  background:
    linear-gradient(#ffffffa8, #ffffffa8),
    repeating-linear-gradient(
      90deg,
      transparent 0 4.8rem,
      #d7d7d1 4.8rem calc(4.8rem + 1px)
    );
  content: "";
  inset: 0;
  opacity: 0.55;
  position: absolute;
}

.hero-stage img {
  filter: drop-shadow(0 2.2rem 2.5rem rgba(25, 25, 20, 0.15));
  height: auto;
  max-height: 38rem;
  max-width: 100%;
  object-fit: contain;
  position: relative;
  width: auto;
  z-index: 1;
}

figcaption {
  color: var(--muted);
  font-size: 0.77rem;
  line-height: 1.45;
  margin: 0.8rem auto 0;
  max-width: var(--reading);
}

.article {
  margin: 0 auto;
  max-width: var(--reading);
  padding: clamp(5rem, 10vw, 8rem) 1.25rem 8rem;
}

.article > p {
  font-size: clamp(1.08rem, 1.6vw, 1.2rem);
  letter-spacing: -0.012em;
  line-height: 1.66;
  margin: 0 0 1.15em;
}

.article h2 {
  font-size: var(--type-section);
  font-weight: 500;
  letter-spacing: -0.055em;
  line-height: 1;
  margin: 3em 0 0.4em;
  text-wrap: balance;
}

.article h3 {
  font-size: 1.35rem;
  letter-spacing: -0.025em;
  line-height: 1.2;
  margin: 2.75em 0 0.8em;
}

.article .lead {
  font-size: clamp(1.35rem, 2.4vw, 1.75rem);
  letter-spacing: -0.025em;
  line-height: 1.45;
}

.facts {
  border-bottom: 1px solid var(--line);
  border-top: 1px solid var(--line);
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  margin: 4rem 0 5rem;
}

.fact {
  padding: 1.3rem 0;
}

.fact:nth-child(odd) {
  border-right: 1px solid var(--line);
  padding-right: 1.3rem;
}

.fact:nth-child(even) {
  padding-left: 1.3rem;
}

.fact:nth-child(-n + 2) {
  border-bottom: 1px solid var(--line);
}

.fact strong {
  display: block;
  font-size: 2.2rem;
  font-variant-numeric: tabular-nums;
  font-weight: 500;
  letter-spacing: -0.06em;
  line-height: 1;
}

.fact span {
  color: var(--muted);
  display: block;
  font-size: 0.75rem;
  line-height: 1.35;
  margin-top: 0.4rem;
}

.wide-break {
  margin-block: clamp(3rem, 8vw, 6rem);
  margin-inline: calc((min(var(--wide), 100vw - 2.5rem) - 100%) / -2);
}

.figure-stage {
  background: var(--figure);
  overflow-x: auto;
  padding: clamp(1.5rem, 5vw, 4rem);
}

.figure-stage--map {
  background: #fff;
  padding: clamp(0.75rem, 2.5vw, 1.75rem);
}

.figure-stage--card {
  align-items: center;
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-height: 22rem;
}

.figure-title {
  color: var(--muted);
  font-size: 0.75rem;
  margin-bottom: 1.5rem;
}

.diagram-host {
  min-width: 34rem;
}

.diagram-host > svg {
  display: block;
  height: auto;
  margin-inline: auto;
  max-width: var(--dg-figure-width, 640px);
  overflow: visible;
  width: 100%;
}

.diagram-host > .lv-heading,
.diagram-host > .lv-grid {
  margin-inline: auto;
  max-width: 60rem;
}

.diagram-host .lv-icon {
  height: 34px;
  max-width: none;
  min-width: 0;
  width: 34px;
}

.diagram-host--ladder {
  min-width: 0;
}

.diagram-host--ladder .lv-grid {
  min-width: 56rem;
}

.dependency {
  display: grid;
  gap: 1px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.dependency-panel {
  background: #fff;
  min-width: 0;
  padding: clamp(1.25rem, 4vw, 3rem);
}

.dependency-panel > b {
  display: block;
  font-size: 0.85rem;
  margin-bottom: 1.4rem;
}

.flat-list {
  display: grid;
  gap: 0.45rem;
}

.flat-row,
.tree-node {
  align-items: center;
  background: var(--soft);
  border: 1px solid var(--line);
  display: flex;
  font-size: 0.75rem;
  justify-content: space-between;
  min-height: 2.5rem;
  padding: 0.65rem 0.8rem;
}

.device-state {
  background: var(--alarm);
  border-radius: 50%;
  display: block;
  height: 0.45rem;
  width: 0.45rem;
}

.device-state--on {
  background: var(--accent);
}

.tree {
  display: grid;
  justify-items: center;
}

.tree-node {
  min-width: 9rem;
}

.tree-node--failed {
  background: var(--alarm-soft);
  border-color: #e4b7b4;
}

.tree-line {
  background: var(--line);
  height: 1.25rem;
  width: 1px;
}

.tree-children {
  border-top: 1px solid var(--line);
  display: grid;
  gap: 0.6rem;
  grid-template-columns: repeat(3, 1fr);
  padding-top: 1.25rem;
  position: relative;
  width: 100%;
}

.tree-children::before {
  background: var(--line);
  content: "";
  height: 1.25rem;
  left: 50%;
  position: absolute;
  top: -1.25rem;
  width: 1px;
}

.tree-children .tree-node {
  color: var(--muted);
  min-width: 0;
}

.signal-interlude {
  background: var(--accent);
  color: var(--accent-ink);
  margin: 7rem calc(50% - 50vw);
  padding: clamp(5rem, 16vw, 11rem) 1.25rem;
  text-align: center;
  width: 100vw;
}

.signal-interlude p {
  font-size: clamp(3.5rem, 10vw, 9rem);
  font-weight: 500;
  letter-spacing: -0.075em;
  line-height: 0.88;
  margin: 0 auto;
  max-width: 70rem;
  text-wrap: balance;
}

.signal-interlude small {
  display: block;
  font-size: 0.78rem;
  margin-top: 2.5rem;
}

.lights {
  display: grid;
  gap: 1px;
  grid-template-columns: repeat(4, 1fr);
}

.light-card {
  background: #fff;
  min-height: 14rem;
  padding: 1.25rem;
}

.light-card b,
.light-card span {
  display: block;
}

.light-card b {
  font-size: 0.84rem;
  margin-top: 2rem;
}

.light-card span {
  color: var(--muted);
  font-size: 0.72rem;
  line-height: 1.4;
  margin-top: 0.35rem;
}

.light {
  background: var(--light-color);
  border-radius: 50%;
  box-shadow: 0 0 0 0.45rem color-mix(in srgb, var(--light-color) 18%, #fff);
  display: block;
  height: 1.2rem;
  width: 1.2rem;
}

.light--green {
  --light-color: var(--accent);
}

.light--amber {
  --light-color: #d49432;
  animation: light-pulse 1.4s ease-in-out infinite;
}

.light--red {
  --light-color: var(--alarm);
  animation: light-pulse 0.55s ease-in-out infinite;
}

.light--grey {
  --light-color: #8b8b86;
}

@keyframes light-pulse {
  0%,
  100% {
    opacity: 1;
  }

  50% {
    opacity: 0.38;
  }
}

blockquote {
  border-left: 0.28rem solid var(--ink);
  font-size: clamp(1.6rem, 3vw, 2.3rem);
  letter-spacing: -0.04em;
  line-height: 1.2;
  margin: 2.25em 0;
  padding-left: 1.25rem;
}

.article blockquote p {
  font-size: inherit;
  line-height: inherit;
  margin: 0;
}

blockquote cite {
  color: var(--muted);
  display: block;
  font-size: 0.75rem;
  font-style: normal;
  letter-spacing: 0;
  margin-top: 1rem;
}

.admission {
  background: var(--alarm-soft);
  margin: 5rem calc(50% - 50vw);
  padding: clamp(4rem, 10vw, 8rem)
    max(1.25rem, calc((100vw - var(--reading)) / 2));
  width: 100vw;
}

.admission p {
  font-size: clamp(1.8rem, 4vw, 3.4rem);
  letter-spacing: -0.045em;
  line-height: 1.08;
  margin: 0;
  text-wrap: balance;
}

.admission small {
  display: block;
  font-size: 0.78rem;
  margin-top: 1.5rem;
}

.decisions {
  list-style: none;
  margin: 2.5rem 0;
  padding: 0;
}

.decisions li {
  align-items: baseline;
  border-top: 1px solid var(--line);
  display: grid;
  gap: 1rem;
  grid-template-columns: 2rem 1fr 1fr;
  padding: 1rem 0;
}

.decisions li:last-child {
  border-bottom: 1px solid var(--line);
}

.decisions span,
.decisions small {
  color: var(--muted);
  font-size: 0.74rem;
}

.decisions strong {
  font-size: 1rem;
}

.results {
  border-top: 1px solid var(--line);
  display: grid;
  margin: 2.5rem 0;
}

.result {
  align-items: baseline;
  border-bottom: 1px solid var(--line);
  display: flex;
  gap: 1.5rem;
  justify-content: space-between;
  padding: 0.9rem 0;
}

.result span {
  color: var(--muted);
  font-size: 0.82rem;
}

.result strong {
  font-size: 1.05rem;
  font-variant-numeric: tabular-nums;
  font-weight: 500;
  text-align: right;
}

.closing {
  border-top: 1px solid var(--line);
  margin-top: 7rem;
  padding-top: 2rem;
}

.closing p {
  color: var(--muted);
  font-size: 0.84rem;
  line-height: 1.55;
}

.next {
  border-top: 1px solid var(--line);
  display: flex;
  font-size: 0.8rem;
  justify-content: space-between;
  margin-top: 4rem;
  padding-top: 2rem;
}

.page-footer {
  align-items: baseline;
  border-top: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  font-size: 0.8rem;
  gap: 0.75rem 1.5rem;
  justify-content: space-between;
  margin: 0 auto;
  max-width: 90rem;
  padding: 2rem clamp(1.25rem, 4vw, 3rem);
}

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

.page-footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.5rem;
}

.wireless-page .spec-figure,
.wireless-page .spec-figure--map {
  background: transparent;
  border: 0;
  margin-inline: 0;
  padding: 0;
  width: auto;
}

.wireless-page .spec-figure figcaption,
.wireless-page .spec-legend {
  max-width: none;
}

.wireless-page .spec-legend {
  margin-top: 1.5rem;
}

.wireless-page .deviceCard,
.wireless-page .mt {
  font-family: Inter, Arial, "Helvetica Neue", Helvetica, sans-serif;
}

.figure-sprite {
  display: none;
}

@media (max-width: 56rem) {
  .lights {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 45rem) {
  .article-head {
    text-align: left;
  }

  .dek {
    margin-left: 0;
    text-wrap: pretty;
  }

  .byline {
    justify-content: flex-start;
  }

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

  .diagram-host--ladder .lv-grid {
    min-width: 0;
  }

  .decisions li {
    grid-template-columns: 1.5rem 1fr;
  }

  .decisions small {
    grid-column: 2;
  }

  .result {
    align-items: flex-start;
    flex-direction: column;
    gap: 0.35rem;
  }

  .result strong {
    text-align: start;
  }

  .next,
  .page-footer {
    align-items: flex-start;
    flex-direction: column;
    gap: 1.25rem;
  }
}

@media (max-width: 30rem) {
  .lights {
    grid-template-columns: 1fr;
  }
}

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

  .light--amber,
  .light--red {
    animation: none;
  }
}