/* Nav bar for the standalone research article pages (the "Read More" targets).
   Same look as the Data Assimilation Tutorials' chapter navigation
   (pages/software/2026.DA.short.tutorial/chapters.css): "Research",
   then Previous | current title | Next around the accent pill. */

.widget-nav {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 6px 0 18px;
  font-size: 0.85rem;
}
.widget-nav .nav-home,
.widget-nav .nav-arrow {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 38px;
  border: 1px solid var(--border);
  border-radius: 9px;
  background: var(--surface);
  color: var(--accent-link);
  text-decoration: none;
  font-weight: 500;
  cursor: pointer;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
  transition: border-color 0.15s ease, background-color 0.15s ease, color 0.15s ease;
}
.widget-nav .nav-home { gap: 6px; padding: 0 14px; white-space: nowrap; }
.widget-nav .nav-arrow { gap: 7px; padding: 0 13px; white-space: nowrap; }
.widget-nav .nav-arrow .nav-label { font-size: 0.82rem; }
.widget-nav .nav-arrow i,
.widget-nav .nav-home i { font-size: 0.95rem; line-height: 1; }
.widget-nav .nav-home:hover,
.widget-nav .nav-arrow:hover {
  border-color: var(--accent);
  background: var(--nav-hover);
  color: var(--text);
}
/* current article title: highlighted accent pill, centred between buttons */
.widget-nav .nav-page {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
  margin: 0 auto;
}
.widget-nav .nav-current {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 38px;
  white-space: nowrap;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  background: var(--accent);
  color: #fff;
  border-radius: 9px;
  padding: 0 18px;
  font-weight: 600;
  letter-spacing: 0.01em;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.18);
}
.widget-nav .nav-current .nav-long {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  min-width: 0;
}
.widget-nav .nav-current .nav-short { display: none; }

@media (max-width: 560px) {
  /* tighter page side padding so the nav row fits the phone width */
  .page { padding-left: 16px; padding-right: 16px; }
  .widget-nav { gap: 7px; }
  .widget-nav .nav-home { padding: 0 10px; }
  /* icon-only back button on phones (like the prev/next arrows) */
  .widget-nav .nav-home .nav-home-label { display: none; }
  .widget-nav .nav-arrow { width: 38px; min-width: 38px; padding: 0; }
  .widget-nav .nav-arrow .nav-label { display: none; }
  /* the title pill shrinks (with ellipsis) rather than overflowing */
  .widget-nav .nav-page { flex: 1 1 auto; min-width: 0; }
  .widget-nav .nav-current { flex: 0 1 auto; min-width: 0; max-width: 100%; padding: 0 12px; }
  .widget-nav .nav-current .nav-long { display: none; }
  .widget-nav .nav-current .nav-short {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.82rem;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }
}