/* Tokens: docs/spec.md section 3, Boeing color grammar */

@font-face {
  font-family: "B612";
  src: url("/fonts/B612-Regular.ttf") format("truetype");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: "B612";
  src: url("/fonts/B612-Bold.ttf") format("truetype");
  font-weight: 700;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: "B612 Mono";
  src: url("/fonts/B612Mono-Regular.ttf") format("truetype");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: "B612 Mono";
  src: url("/fonts/B612Mono-Bold.ttf") format("truetype");
  font-weight: 700;
  font-style: normal;
  font-display: swap;
}

:root {
  --panel: #0B0E12;
  --bezel: #1C2126;
  --value: #F2F4F6;
  --label: #C7CCD1;
  --scale: #4DD9E8;
  --nominal: #34D058;
  --caution: #FFB020;
  --warning: #FF3B30;
  --commanded: #E93FE9;
  --font-body: "B612", system-ui, sans-serif;
  --font-mono: "B612 Mono", ui-monospace, Menlo, monospace;
}

* {
  box-sizing: border-box;
}

html {
  color-scheme: dark;
}

body {
  margin: 0;
  background: var(--panel);
  color: var(--value);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.55;
  overflow-x: hidden;
}

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

a:hover,
a:focus-visible {
  text-decoration: underline;
}

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

.page {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.page > header,
.page > main,
.page > footer {
  width: 100%;
  max-width: 44rem;
  margin: 0 auto;
  padding-left: 1.25rem;
  padding-right: 1.25rem;
}

header.masthead {
  padding: 1.25rem 1.25rem;
  border-bottom: 1px solid var(--bezel);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.25rem;
  flex-wrap: wrap;
}

a.wordmark {
  font-family: var(--font-mono);
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--value);
  text-decoration: none;
  font-variant-numeric: tabular-nums;
}

a.wordmark:hover,
a.wordmark:focus-visible {
  color: var(--scale);
  text-decoration: none;
}

nav.masthead-nav {
  display: flex;
  gap: 1.25rem;
}

nav.masthead-nav a {
  color: var(--label);
  text-decoration: none;
  padding-bottom: 0.2rem;
  border-bottom: 2px solid transparent;
}

nav.masthead-nav a:hover,
nav.masthead-nav a:focus-visible {
  color: var(--scale);
  text-decoration: none;
}

nav.masthead-nav a[aria-current="page"] {
  color: var(--value);
  border-bottom-color: var(--scale);
}

main {
  flex: 1 0 auto;
}

main.prose h1 {
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 2rem;
  margin: 2rem 0 0.5rem;
}

main.prose .meta {
  display: block;
  margin-bottom: 2rem;
}

main.prose h2 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-top: 2.5rem;
  margin-bottom: 1rem;
  border-top: 1px solid var(--bezel);
  padding-top: 1.25rem;
}

main.prose h3 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--label);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-top: 1.5rem;
  margin-bottom: 0.5rem;
}

main.prose p {
  color: var(--value);
}

main.prose ul,
main.prose ol {
  color: var(--value);
}

main.prose li {
  margin: 0.4rem 0;
}

main.prose dl dt {
  color: var(--value);
  font-weight: 700;
  margin-top: 1rem;
}

main.prose dl dd {
  color: var(--label);
  margin-left: 0;
}

main.prose a {
  color: var(--scale);
}

main.prose code,
main.prose kbd {
  font-family: var(--font-mono);
  font-size: 0.92em;
  background: var(--bezel);
  padding: 0.15rem;
  border-radius: 0.25rem;
}

main.prose table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.25rem 0;
}

main.prose th,
main.prose td {
  border: 1px solid var(--bezel);
  padding: 0.5rem 0.75rem;
  text-align: left;
}

main.prose th {
  color: var(--label);
  text-transform: uppercase;
  font-size: 0.85rem;
  letter-spacing: 0.04em;
}

main.prose td {
  color: var(--value);
}

main.prose strong {
  color: var(--value);
}

.meta {
  font-family: var(--font-mono);
  color: var(--label);
  font-size: 0.9rem;
  font-variant-numeric: tabular-nums;
}

.notice {
  border: 1px solid var(--bezel);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.06);
  border-radius: 0.5rem;
  padding: 1rem 1.25rem;
  color: var(--label);
  margin: 1.5rem 0;
}

.notice > strong {
  display: block;
  color: var(--value);
  margin-bottom: 0.4rem;
}

.faq dt {
  color: var(--value);
  font-weight: 700;
  margin-top: 1rem;
}

.faq dd {
  color: var(--label);
  margin-left: 0;
  margin-bottom: 1.5rem;
}

.steps {
  list-style: none;
  padding-left: 0;
  counter-reset: step;
}

.steps li {
  counter-increment: step;
  position: relative;
  padding-left: 2.5rem;
  margin: 0.75rem 0;
}

.steps li::before {
  content: counter(step);
  position: absolute;
  left: 0;
  top: 0;
  font-family: var(--font-mono);
  color: var(--scale);
  font-variant-numeric: tabular-nums;
}

footer.footer {
  margin-top: auto;
  border-top: 1px solid var(--bezel);
  padding: 1.5rem 1.25rem 2rem;
  color: var(--label);
  font-size: 0.9rem;
}

nav.footer-nav {
  display: flex;
  gap: 1.25rem;
  flex-wrap: wrap;
  margin-bottom: 0.75rem;
}

nav.footer-nav a {
  color: var(--label);
}

nav.footer-nav a:hover,
nav.footer-nav a:focus-visible {
  color: var(--scale);
}

.footer-meta {
  font-family: var(--font-mono);
  color: var(--label);
  font-size: 0.85rem;
  font-variant-numeric: tabular-nums;
}

.hero {
  padding: 3rem 0 2rem;
}

.hero-tagline {
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 2.25rem;
  line-height: 1.2;
  margin: 0 0 1rem;
  color: var(--value);
}

.hero-lede {
  color: var(--label);
  font-size: 1.05rem;
  margin: 0 0 2rem;
  max-width: 38rem;
}

.readout {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  border: 1px solid var(--bezel);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.06);
  border-radius: 0.5rem;
  padding: 1.5rem;
  margin-bottom: 2.5rem;
  background: var(--panel);
}

.readout-scale {
  flex: 0 0 auto;
  height: 6rem;
  width: auto;
}

.readout-scale line {
  stroke: var(--scale);
}

.readout-figures {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
}

.readout-value {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 4rem;
  line-height: 1;
  color: var(--value);
  font-variant-numeric: tabular-nums;
}

.readout-unit {
  font-family: var(--font-mono);
  color: var(--label);
  font-size: 0.9rem;
  letter-spacing: 0.1em;
}

.readout-caption {
  display: block;
  margin-top: 0.5rem;
}

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

.points {
  list-style: none;
  padding: 0;
  margin: 0 0 2.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.point {
  color: var(--label);
}

.point strong {
  display: block;
  color: var(--value);
  font-size: 1.05rem;
  margin-bottom: 0.25rem;
}

.hero-cta {
  font-family: var(--font-mono);
  color: var(--value);
  font-size: 1.05rem;
  margin: 0 0 0.5rem;
  font-variant-numeric: tabular-nums;
}

.hero-cta-note {
  display: block;
  font-family: var(--font-body);
  color: var(--label);
  font-size: 0.95rem;
  margin-top: 0.5rem;
}

@media (min-width: 40rem) {
  .hero-tagline {
    font-size: 2.75rem;
  }
}

@media (max-width: 30rem) {
  .readout {
    padding: 1rem;
    gap: 0.75rem;
  }

  .readout-value {
    font-size: 2.75rem;
  }
}