/* =============================================================================
   Breadcrumbs  (Agent B — nav/crumbs)
   Uses CSS tokens only — no hardcoded colors. Works across light/dark/parchment.
   ============================================================================= */

/* Hide the nav entirely when the crumb list is empty (home page). */
.nav-crumbs:not(:has(li)) {
  display: none;
}

.nav-crumbs {
  margin: 0 0 var(--s-4);
  font-size: 13px;
  color: var(--text-faint);
}
.nav-crumbs ol {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0;
}
.nav-crumbs li {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  text-transform: lowercase;
}
.nav-crumbs li:not(:last-child)::after {
  content: "\203a"; /* › */
  margin: 0 8px;
  color: var(--text-faint);
}
.nav-crumbs a {
  color: var(--text-muted);
  text-decoration: none;
  padding: 2px 0;
  transition: color var(--dur) var(--ease);
}
.nav-crumbs a:hover {
  color: var(--text);
  text-decoration: underline;
}
.nav-crumbs [aria-current="page"] {
  color: var(--text-muted);
  max-width: 40ch;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
@media (max-width: 640px) {
  .nav-crumbs [aria-current="page"] {
    max-width: 25ch;
  }
}

/* =============================================================================
   Adjacent-section nav  (Agent B — nav/crumbs)
   Only appears on top-level section pages (about, gallery, posts, resume, portfolio).
   ============================================================================= */

.nav-adjacent {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--s-4);
  margin: var(--s-7) 0 var(--s-5);
  padding: var(--s-4) 0;
  border-top: 1px solid var(--border);
}
.nav-adjacent-prev,
.nav-adjacent-next {
  display: flex;
  flex-direction: column;
  gap: var(--s-1);
  padding: var(--s-3) var(--s-4);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  text-decoration: none;
  color: var(--text);
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}
.nav-adjacent-prev:hover,
.nav-adjacent-next:hover {
  border-color: var(--border-strong);
  background: var(--surface-1);
}
.nav-adjacent-next {
  text-align: right;
}
.nav-adjacent-label {
  font-size: var(--fs-caption);
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: var(--ls-label);
}
.nav-adjacent-title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 16px;
  color: var(--text);
}
@media (max-width: 640px) {
  .nav-adjacent {
    grid-template-columns: 1fr;
    gap: var(--s-2);
  }
  .nav-adjacent-next {
    text-align: left;
  }
}

/* Respect prefers-reduced-motion — disable transitions. */
@media (prefers-reduced-motion: reduce) {
  .nav-crumbs a,
  .nav-adjacent-prev,
  .nav-adjacent-next {
    transition: none;
  }
}