/* Shared styles for the Data Assimilation Tutorials chapter pages
   (pages/software/2026.DA.short.tutorial/). Linked by every chapter page and the
   outline page; keeps the chapter navigation and layout consistent across
   the series. Site-wide styles come from ../../../style.css.
*/

/* wide page column for the widget-hosted chapter pages */
#widget-page { display: block; max-width: 1180px; margin: 0 auto; }
#widget-page h3 { font-size: 17px; margin: 28px 0 8px; }
#widget-page code { overflow-wrap: break-word; }

.hint { font-size: 0.85rem; color: var(--text-muted); margin: 6px 0 0; }

/* ----------------------------------------------------- chapter navigation
   one button language for everything: “← Outline”, “← Previous” and
   “Next →” are identical bordered pills (same height, same corner radius),
   grouped around the highlighted current chapter title. */
.widget-nav {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 6px 0 18px;
  font-size: 0.85rem;
}
/* second copy at the foot of the page: same bar, flipped margins (bigger
   gap above to separate it from the last paragraph, border-top as a rule) */
.widget-nav-bottom {
  margin: 32px 0 6px;
  padding-top: 22px;
  border-top: 1px solid var(--border);
}
.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 chapter 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);
}
/* full chapter title inside the pill; ellipsizes when squeezed, and on
   narrow screens is replaced entirely by a compact “icon + Ch n” form */
.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; }

/* ------------------------------------------------ planned-chapter panel */
.planned {
  border: 1px dashed var(--border);
  border-radius: 12px;
  background: var(--surface);
  padding: 26px 30px;
  margin-top: 8px;
}
.planned .planned-tag {
  display: inline-block;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 3px 12px;
  margin: 0 0 14px;
}
.planned h3 { margin-top: 0; }
.planned .planned-desc { font-size: 0.95rem; line-height: 1.6; margin: 10px 0 0; }
.planned .planned-ref { font-size: 0.8rem; color: var(--text-muted); margin-top: 16px; }

/* section divider used on multi-section chapter pages */
.part-divider { border: none; border-top: 1px solid var(--border); margin: 36px 0 8px; }

/* inline equation display used on chapter pages */
.formula {
  font-size: 0.95rem;
  line-height: 1.9;
  text-align: center;
  background: var(--surface, #f5f4f1);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 14px;
  margin: 14px 0;
  overflow-x: auto;
}

@media (max-width: 560px) {
  #widget-page { padding-left: 14px; padding-right: 14px; }
  .widget-nav { gap: 7px; }
  .widget-nav .nav-arrow { width: 38px; min-width: 38px; padding: 0; }
  .widget-nav .nav-arrow .nav-label { display: none; }
  .widget-nav .nav-current { 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;
  }
}
/* prevent slight horizontal overflow from vertical scrollbar width on
   some mobile engines (html-only — not body, to avoid iOS scroll break) */
html { overflow-x: hidden; }