/* Blue Door Labs - plain static site. System fonts, no scripts. */
:root {
  --ink: #1b2430;
  --muted: #5a6573;
  --door: #1f4f8a;
  --door-dark: #163a68;
  --paper: #ffffff;
  --tint: #f3f6fa;
  --line: #dde3ea;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font: 18px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}
.wrap { max-width: 44rem; margin: 0 auto; padding: 0 1.25rem; }
a { color: var(--door); text-underline-offset: 0.15em; }
a:hover { color: var(--door-dark); }

.site-header { border-bottom: 1px solid var(--line); background: var(--tint); }
.site-header .wrap { display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: 0.5rem 1.5rem; padding-top: 1rem; padding-bottom: 1rem; }
.brand { font-weight: 700; font-size: 1.15rem; color: var(--door-dark); text-decoration: none; letter-spacing: 0.01em; }
nav { display: flex; flex-wrap: wrap; gap: 0.25rem 1.25rem; }
nav a { color: var(--ink); text-decoration: none; padding: 0.15rem 0; border-bottom: 2px solid transparent; }
nav a:hover { border-bottom-color: var(--line); }
nav a[aria-current="page"] { border-bottom-color: var(--door); font-weight: 600; }

main { padding-top: 2.5rem; padding-bottom: 3rem; }
h1 { font-size: 2.1rem; line-height: 1.2; margin: 0 0 1rem; }
h2 { font-size: 1.35rem; line-height: 1.3; margin: 2.25rem 0 0.5rem; }
h3 { font-size: 1.1rem; margin: 1.25rem 0 0.35rem; }
p, ul, dl { margin: 0 0 1rem; }
ul { padding-left: 1.25rem; }
li { margin-bottom: 0.4rem; }
.lead { font-size: 1.15rem; color: var(--ink); }
.meta { color: var(--muted); font-size: 0.95rem; }
.small { font-size: 0.9rem; }

.hero { padding: 0.5rem 0 0.5rem; }
.card { border: 1px solid var(--line); border-radius: 8px; padding: 1.25rem 1.5rem; background: var(--tint); margin-bottom: 1rem; }
.card h2, .card h3:first-child { margin-top: 0; }

.facts { display: grid; grid-template-columns: 11rem 1fr; gap: 0.5rem 1rem; }
.facts dt { color: var(--muted); }
.facts dd { margin: 0; }

.site-footer { border-top: 1px solid var(--line); background: var(--tint); color: var(--muted); font-size: 0.95rem; padding: 1.5rem 0 2rem; }
.site-footer p { margin: 0 0 0.75rem; }
.site-footer a { color: var(--ink); }

@media (max-width: 36rem) {
  body { font-size: 17px; }
  h1 { font-size: 1.75rem; }
  .facts { grid-template-columns: 1fr; gap: 0; }
  .facts dd { margin-bottom: 0.75rem; }
}