/* Page headers and breadcrumbs, Arc-style (piece 16, group b-navigation).
 *
 * .oc-ph comes from partials/page_header.html: the title at 20px / 500 in
 * full ink, an optional line in secondary ink under it, the actions on the
 * right (they wrap under the title on narrow screens), an optional row
 * under the header for tabs or filters. Spacing on the 4px grid; no rule or
 * card around it (Arc page-header sits on the page).
 *
 * .oc-crumb is the breadcrumb in the top bar title: parents in secondary
 * ink, a chevron in the strong line colour, the current page in full ink.
 * Only the current crumb rises in, as the top bar title does (piece 2).
 */

/* ---- Header ----------------------------------------------------------- */
html body:is(body, #oc-arc):is(body, #oc-arc-2) .oc-ph {
  display: flex !important;
  flex-direction: column !important;
  flex-wrap: nowrap !important;
  align-items: stretch !important;
  justify-content: flex-start !important;
  align-self: stretch !important;
  gap: var(--arc-space-3) !important;
  width: auto !important;
  max-width: none !important;
  text-align: start !important;
  margin: 0 0 var(--arc-space-4) !important;
  padding: 0 !important;
  border: 0 !important;
  background: none !important;
  box-shadow: none !important;
  min-width: 0;
}
html body:is(body, #oc-arc):is(body, #oc-arc-2) .oc-ph__row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--arc-space-3) var(--arc-space-4);
  flex-wrap: wrap;
  min-width: 0;
}
html body:is(body, #oc-arc):is(body, #oc-arc-2) .oc-ph__lead {
  display: flex;
  flex-direction: column;
  gap: var(--arc-space-1);
  min-width: 0;
  flex: 1 1 18rem;
}
html body:is(body, #oc-arc):is(body, #oc-arc-2) .oc-ph__titleline {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  min-width: 0;
  min-height: var(--arc-control-md);
}
html body:is(body, #oc-arc):is(body, #oc-arc-2) .oc-ph__title {
  margin: 0 !important;
  padding: 0 !important;
  color: var(--arc-foreground) !important;
  font-family: inherit !important;
  font-size: var(--arc-text-title) !important;
  font-weight: var(--arc-weight-strong) !important;
  font-style: normal !important;
  line-height: 1.25 !important;
  letter-spacing: -0.012em !important;
  text-transform: none !important;
  min-width: 0;
  overflow-wrap: anywhere;
}
html body:is(body, #oc-arc):is(body, #oc-arc-2) .oc-ph__desc {
  margin: 0 !important;
  max-width: 72ch;
  color: var(--arc-text-secondary) !important;
  font-size: var(--arc-text-sm) !important;
  font-style: normal !important;
  line-height: 1.45;
}
html body:is(body, #oc-arc):is(body, #oc-arc-2) .oc-ph__desc:empty { display: none; }
html body:is(body, #oc-arc):is(body, #oc-arc-2) .oc-ph__actions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--arc-space-2);
  flex-wrap: wrap;
  min-height: var(--arc-control-md);
  margin-left: auto;
}
html body:is(body, #oc-arc):is(body, #oc-arc-2) .oc-ph__below {
  display: flex;
  align-items: center;
  gap: var(--arc-space-2) var(--arc-space-3);
  flex-wrap: wrap;
  min-width: 0;
}
@media (max-width: 640px) {
  html body:is(body, #oc-arc):is(body, #oc-arc-2) .oc-ph__actions {
    margin-left: 0;
    justify-content: flex-start;
    width: 100%;
  }
}

/* ---- Breadcrumb ------------------------------------------------------- */
html body:is(body, #oc-arc):is(body, #oc-arc-2) .oc-crumb { min-width: 0; }
html body:is(body, #oc-arc):is(body, #oc-arc-2) .oc-crumb__list {
  display: flex;
  align-items: center;
  gap: 2px var(--arc-space-1);
  margin: 0;
  padding: 0;
  list-style: none;
  min-width: 0;
}
html body:is(body, #oc-arc):is(body, #oc-arc-2) .oc-crumb__item {
  display: inline-flex;
  align-items: center;
  gap: var(--arc-space-1);
  min-width: 0;
  white-space: nowrap;
}
html body:is(body, #oc-arc):is(body, #oc-arc-2) .oc-crumb__link {
  border-radius: 6px;
  padding: 2px;
  color: var(--arc-text-secondary) !important;
  font-weight: var(--arc-weight) !important;
  opacity: 1 !important;
  text-decoration: underline 1px;
  text-decoration-color: transparent;
  text-underline-offset: 4px;
  transition: color var(--arc-dur-fast) var(--arc-ease), text-decoration-color var(--arc-dur-fast) var(--arc-ease);
}
@media (hover: hover) and (pointer: fine) {
  html body:is(body, #oc-arc):is(body, #oc-arc-2) .oc-crumb__link:hover {
    color: var(--arc-foreground) !important;
    text-decoration-color: color-mix(in srgb, currentColor 45%, transparent);
  }
}
html body:is(body, #oc-arc):is(body, #oc-arc-2) .oc-crumb__link:focus-visible {
  outline: 2px solid var(--arc-focus);
  outline-offset: 1px;
}
html body:is(body, #oc-arc):is(body, #oc-arc-2) .oc-crumb__sep {
  flex: none;
  color: var(--arc-border-strong);
}
html body:is(body, #oc-arc):is(body, #oc-arc-2) .oc-crumb__current {
  display: inline-block;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  color: var(--arc-foreground);
  font-weight: var(--arc-weight-strong);
  animation: oc-crumb-rise var(--arc-dur-considered) var(--arc-ease-enter) both;
}
@keyframes oc-crumb-rise {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: none; }
}
/* In the top bar the whole title rose in before; now only the current
   crumb does, so the path reads as a place and the page as the arrival. */
html body:is(body, #oc-arc):is(body, #oc-arc-2) .top-bar .top-bar-title:has(.oc-crumb) { animation: none; }

@media (prefers-reduced-motion: reduce) {
  html body:is(body, #oc-arc):is(body, #oc-arc-2) .oc-crumb__current { animation: none; }
  html body:is(body, #oc-arc):is(body, #oc-arc-2) .oc-crumb__link { transition: none; }
}