:root {
  --bg: #f3f7fb;
  --ink: #12313a;
  --muted: #4a6b74;
  --line: #8ec5d1;
  --accent: #0e7490;
  --mono: "SF Mono", "IBM Plex Mono", ui-monospace, Menlo, monospace;
  --sans: "Avenir Next", "Segoe UI", Helvetica, sans-serif;
  --max: 1040px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  font-family: var(--sans);
  line-height: 1.6;
  background-color: var(--bg);
  background-image:
    linear-gradient(rgba(14, 116, 144, 0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(14, 116, 144, 0.07) 1px, transparent 1px);
  background-size: 24px 24px;
}

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

.skip-link {
  position: absolute;
  left: 1rem;
  top: -3rem;
  z-index: 20;
  padding: 0.5rem 0.8rem;
  background: var(--accent);
  color: #fff;
  text-decoration: none;
}

.skip-link:focus {
  top: 1rem;
}

.wrap {
  width: min(var(--max), calc(100% - 2rem));
  margin-inline: auto;
}

.title-block {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(243, 247, 251, 0.92);
  border-bottom: 2px solid var(--accent);
}

.bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 3.6rem;
}

.logo,
.callout,
.label,
.dims dt,
.revs span {
  font-family: var(--mono);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  font-size: 0.78rem;
  color: var(--accent);
}

.logo {
  text-decoration: none;
  font-weight: 700;
}

.nav-toggle {
  display: none;
  border: 1px solid var(--accent);
  background: var(--bg);
  color: var(--ink);
  padding: 0.35rem 0.7rem;
  font: inherit;
}

.site-nav {
  display: flex;
  gap: 1.2rem;
}

.site-nav a {
  text-decoration: none;
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--ink);
}

.hero {
  padding: 3.5rem 0 2rem;
}

h1 {
  margin: 0.4rem 0 0.8rem;
  font-size: clamp(2.6rem, 7vw, 4.8rem);
  letter-spacing: -0.03em;
  line-height: 1;
}

.lede,
.sheet p {
  max-width: 40rem;
  color: var(--muted);
}

.sheet {
  margin: 1.4rem 0 2rem;
  padding: 1.2rem 1.3rem;
  border: 1px solid var(--accent);
  background: rgba(243, 247, 251, 0.86);
}

.label {
  margin-bottom: 0.8rem;
}

.dims {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin: 1.2rem 0 0;
}

.dims dt {
  margin: 0;
}

.dims dd {
  margin: 0.25rem 0 0;
}

.drawings {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}

.revs {
  margin: 0;
  padding: 0;
  list-style: none;
}

.revs li {
  padding: 0.55rem 0;
  border-top: 1px dashed var(--line);
}

.stamp {
  border-width: 3px;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 0 2.4rem;
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--muted);
}

.missing {
  min-height: 70vh;
  display: grid;
  align-content: center;
}

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

@media (max-width: 860px) {
  .nav-toggle {
    display: inline-flex;
  }

  .site-nav {
    display: none;
    position: absolute;
    top: 3.6rem;
    right: 1rem;
    left: 1rem;
    padding: 1rem;
    flex-direction: column;
    background: var(--bg);
    border: 1px solid var(--accent);
  }

  .site-nav.is-open {
    display: flex;
  }

  .dims,
  .drawings,
  .site-footer {
    grid-template-columns: 1fr;
  }
}