:root {
  --ground: #0b0d0f;
  --raised: #121518;
  --ink: #e4e8eb;
  --ink-soft: #c3cad0;
  --muted: #8a949c;
  --faint: #6b767e;
  --hairline: #252a2f;
  --edge: #353b41;
  --accent: #00d8d8;
  --mono: ui-monospace, "Cascadia Mono", "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;
  --sans: ui-sans-serif, system-ui, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color-scheme: dark;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--ground);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

a:hover,
a:focus-visible {
  text-decoration: underline;
  text-underline-offset: 3px;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.mono {
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
}

.muted {
  color: var(--muted);
}

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

.wrap {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 32px;
}

/* ── top bar ─────────────────────────────────────────── */

.bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding: 28px 0;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--ink);
  font-size: 16px;
}

.brand img {
  display: block;
}

.bar nav {
  display: flex;
  gap: 28px;
  font-size: 14px;
}

.bar nav .muted {
  color: var(--muted);
}

/* ── hero ────────────────────────────────────────────── */

.hero {
  display: grid;
  grid-template-columns: 5fr 6fr;
  gap: 56px;
  align-items: center;
  padding: 88px 0 120px;
}

.eyebrow {
  margin: 0 0 24px;
  font-size: 14px;
  color: var(--muted);
}

h1 {
  margin: 0;
  font-family: var(--mono);
  font-size: 42px;
  line-height: 1.15;
  font-weight: 500;
  letter-spacing: -0.01em;
}

.lede {
  margin: 28px 0 0;
  max-width: 34em;
  color: var(--ink-soft);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px 28px;
  margin-top: 40px;
  font-family: var(--mono);
  font-size: 15px;
}

.button {
  background: var(--accent);
  color: var(--ground);
  padding: 14px 22px;
  border-radius: 2px;
  font-weight: 600;
}

.button:hover,
.button:focus-visible {
  text-decoration: none;
  background: #5ce8e8;
}

.diagram {
  margin: 0;
  background: var(--raised);
  border: 1px solid var(--hairline);
  padding: 28px 28px 22px;
}

.diagram svg {
  display: block;
  width: 100%;
  height: auto;
  font-family: var(--mono);
  font-size: 14px;
}

.diagram figcaption {
  margin-top: 16px;
  font-size: 14px;
  line-height: 1.5;
  color: var(--muted);
}

/* ── two-column blocks ───────────────────────────────── */

.block {
  display: grid;
  grid-template-columns: 4fr 8fr;
  gap: 48px;
  padding: 120px 0;
  border-top: 1px solid var(--hairline);
}

.block h2 {
  margin: 0;
  font-family: var(--mono);
  font-size: 26px;
  line-height: 1.25;
  font-weight: 500;
}

.prose p {
  margin: 0 0 18px;
  max-width: 62ch;
}

.prose p:last-child {
  margin-bottom: 0;
}

.label,
.block h2.label {
  margin: 0 0 16px;
  font-family: var(--mono);
  font-size: 14px;
  font-weight: 400;
  line-height: 1.6;
  color: var(--muted);
}

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

.steps li {
  display: grid;
  grid-template-columns: 40px 1fr;
  margin-bottom: 18px;
  max-width: calc(62ch + 40px);
  counter-increment: step;
}

.steps li::before {
  content: counter(step);
  font-family: var(--mono);
  color: var(--accent);
}

.steps li:last-child {
  margin-bottom: 0;
}

.figure {
  margin: 0;
  font-family: var(--mono);
  font-size: 64px;
  white-space: nowrap;
  line-height: 1;
  font-weight: 500;
}

.figure-note {
  margin: 14px 0 0;
  max-width: 16em;
  font-size: 15px;
  color: var(--muted);
}

.scope {
  max-width: 62ch;
  margin-top: 28px;
  padding: 18px 22px;
  border: 1px solid var(--edge);
}

.scope p {
  margin: 0;
}

.scope .label {
  margin-bottom: 6px;
  font-size: 13px;
}

/* calibration rows */

.rows {
  display: grid;
  grid-template-columns: 1fr auto;
  column-gap: 24px;
  max-width: 720px;
  margin: 0;
  font-size: 16px;
}

.rows dt,
.rows dd {
  margin: 0;
  padding: 12px 0;
  border-bottom: 1px solid var(--hairline);
}

.rows dd {
  text-align: right;
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
}

.prose .after-rows {
  margin-top: 24px;
  color: var(--muted);
}

.shot {
  margin: 40px 0 0;
}

.shot img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--hairline);
}

.shot figcaption {
  margin-top: 12px;
  font-size: 14px;
  line-height: 1.5;
  color: var(--muted);
  max-width: 62ch;
}

/* out of scope */

.limits {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px 40px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 16px;
}

/* questions */

.faq dt {
  font-family: var(--mono);
}

.faq dd {
  margin: 0 0 22px;
  max-width: 62ch;
}

.faq dd:last-child {
  margin-bottom: 0;
}

/* ── footer ──────────────────────────────────────────── */

footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 16px 32px;
  padding: 40px 0 56px;
  border-top: 1px solid var(--hairline);
  font-size: 14px;
  color: var(--muted);
}

.foot-links {
  display: flex;
  gap: 24px;
  font-family: var(--mono);
}

/* ── narrow screens ──────────────────────────────────── */

@media (max-width: 960px) {
  .hero {
    grid-template-columns: 1fr;
    gap: 48px;
    padding: 56px 0 80px;
  }
}

@media (max-width: 720px) {
  .wrap {
    padding: 0 16px;
  }

  .bar nav {
    display: none;
  }

  h1 {
    font-size: 30px;
  }

  .diagram {
    padding: 16px 12px 14px;
  }

  .block {
    grid-template-columns: 1fr;
    gap: 24px;
    padding: 64px 0;
  }

  .block h2 {
    font-size: 22px;
  }

  .figure {
    font-size: 56px;
  }

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

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

  .rows dt {
    padding-bottom: 2px;
    border-bottom: 0;
    color: var(--muted);
    font-size: 15px;
  }

  .rows dd {
    text-align: left;
    padding-top: 0;
  }
}