/* ── Project nav — the left rail ─────────────────────────────────────────────
   Pairs with src/components/project-nav.js. Extracted from the Situs onboarding page,
   which proved the shape before it was a template.

   Artifacts speak the short palette (--panel --text --muted --border --accent
   --accent-soft --faint --mono). Every colour below is a fallback chain so the
   file also works on a page that only has the site tokens. */

.shell { display: grid; grid-template-columns: 250px minmax(0, 1fr); gap: 34px; align-items: start; }

nav.project-nav { position: sticky; top: 16px; align-self: start; }
.navlab {
  font-size: 10.5px; text-transform: uppercase; letter-spacing: .1em;
  color: var(--faint, var(--color-text-mid)); font-weight: 680; margin: 0 0 8px; padding-left: 11px;
}
.navgroup { margin: 0 0 10px; }
.navgroup > summary {
  list-style: none; cursor: pointer; display: flex; align-items: center;
  justify-content: space-between; gap: 8px; padding: 5px 11px;
  font-size: 10.5px; text-transform: uppercase; letter-spacing: .1em;
  color: var(--faint, var(--color-text-mid)); font-weight: 680; border-radius: 6px;
}
.navgroup > summary::-webkit-details-marker { display: none; }
.navgroup > summary:hover { color: var(--muted, var(--color-text-mid)); background: var(--panel, var(--color-bg-card)); }
.navgroup > summary .ncount { font: 600 10px/1 var(--mono, ui-monospace, Menlo, monospace); color: var(--faint, var(--color-text-mid)); opacity: .7; }
.navgroup[open] > summary { color: var(--muted, var(--color-text-mid)); }

.navb {
  display: flex; align-items: baseline; gap: 8px; width: 100%; text-align: left;
  background: none; border: 0; border-left: 2px solid var(--border, var(--color-border));
  border-radius: 0 7px 7px 0; padding: 8px 11px; font: inherit; font-size: 13.5px;
  color: var(--muted, var(--color-text-mid)); cursor: pointer; line-height: 1.35;
}
.navb:hover { color: var(--text, var(--color-text)); background: var(--panel, var(--color-bg-card)); }
.navb.on {
  color: var(--accent, var(--color-primary)); border-left-color: var(--accent, var(--color-primary));
  background: var(--accent-soft, transparent); font-weight: 620;
}
.navb .nn { font: 600 10px/1 var(--mono, ui-monospace, Menlo, monospace); color: var(--faint, var(--color-text-mid)); min-width: 14px; }
.navb.on .nn { color: var(--accent, var(--color-primary)); }
.navb:focus-visible { outline: 2px solid var(--accent, var(--color-primary)); outline-offset: -2px; }

/* Below the two-column tier the rail becomes a horizontal strip of tabs rather
   than disappearing — the panes are only reachable through it. */
@media (max-width: 900px) {
  .shell { grid-template-columns: minmax(0, 1fr); gap: 16px; }
  nav.project-nav { position: static; overflow-x: auto; min-width: 0; max-width: 100%; padding-bottom: 4px; }
  .navlab { display: none; }
  nav.project-nav .navlist { display: flex; gap: 6px; min-width: min-content; }
  .navgroup { margin: 0; }
  .navb {
    border-left: 0; border-bottom: 2px solid var(--border, var(--color-border));
    border-radius: 7px 7px 0 0; white-space: nowrap; width: auto;
  }
  .navb.on { border-left: 0; border-bottom-color: var(--accent, var(--color-primary)); }
  .navb .nn { display: none; }
}