/* Handbook chrome (sticky header + footer) for the self-contained design-
   foundations pages, so the Design section shares the site's nav and footer.
   Scoped to .site-header / .site-footer and applied to <div>s (not <header>/
   <footer>) so the foundations' element-level header{}/footer{} rules don't
   collide. Uses the tokens + Space Mono already defined per page. */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--bg) 85%, transparent);
  backdrop-filter: saturate(140%) blur(12px);
  -webkit-backdrop-filter: saturate(140%) blur(12px);
  border-bottom: 1px solid var(--line);
}
.site-header .wrap,
.site-footer .wrap {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 1.5rem;
}
.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  height: 60px;
}
.site-header .brand {
  font-family: "Space Mono", monospace;
  font-weight: 700;
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ink);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
}
.site-header .brand::before {
  content: "";
  width: 22px;
  height: 2px;
  background: var(--red);
}
.site-header nav {
  display: flex;
  align-items: center;
  gap: 1.4rem;
  font-family: "Space Mono", monospace;
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.site-header nav a {
  color: var(--ink-dim);
  text-decoration: none;
  transition: color 0.25s ease;
}
.site-header nav a:hover,
.site-header nav a[aria-current] {
  color: var(--ink);
}
.site-footer {
  max-width: 1080px;
  margin: 5rem auto 0;
  padding: 0 1.5rem 4rem;
}
.site-footer .foot-top {
  border-top: 1px solid var(--line);
  padding-top: 2rem;
  display: flex;
  justify-content: space-between;
  gap: 1rem 2rem;
  flex-wrap: wrap;
  align-items: baseline;
}
.site-footer .foot-label {
  font-family: "Space Mono", monospace;
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-dim);
}
.site-footer .colophon {
  font-family: "Space Mono", monospace;
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--ink-faint);
  margin: 0;
}
.site-footer nav {
  margin-top: 1.25rem;
  padding-top: 1.15rem;
  border-top: 1px solid var(--line);
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
}
.site-footer nav a {
  font-family: "Space Mono", monospace;
  font-size: 0.74rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-dim);
  text-decoration: none;
  transition: color 0.25s ease;
}
.site-footer nav a:hover {
  color: var(--ink);
}
@media (max-width: 620px) {
  .site-header nav {
    gap: 0.9rem;
    font-size: 0.68rem;
  }
  .site-header .brand span {
    display: none;
  }
}