/* Shared case-study navigation component. Contract: Shell / Second Level Navigation (Figma 525:728). */
.case-study-topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
  padding: 10px max(24px, calc((100% - 1256px) / 2));
  border-bottom: var(--border-width-thin) solid var(--color-stroke-subtle);
  background: rgba(250, 250, 248, .72);
  backdrop-filter: blur(16px) saturate(115%);
  -webkit-backdrop-filter: blur(16px) saturate(115%);
  transition: background-color 220ms ease, box-shadow 220ms ease;
}
.case-study-topbar.is-scrolled {
  background: rgba(250, 250, 248, .88);
  box-shadow: 0 8px 24px var(--color-surface-white-7);
}
.case-study-topbar__context { display: flex; align-items: baseline; gap: 24px; min-width: 0; }
.case-study-topbar__back,
.case-study-topbar__breadcrumb,
.case-study-topbar__action { font-family: var(--mono); text-decoration: none; text-transform: uppercase; }
.case-study-topbar__back { flex: 0 0 auto; color: var(--color-accent-purple); font-size: 11px; font-weight: 500; letter-spacing: .08em; }
.case-study-topbar__breadcrumb { overflow: hidden; color: var(--muted); font-size: 10px; letter-spacing: .08em; text-overflow: ellipsis; white-space: nowrap; }
.case-study-topbar__navigation { display: flex; flex: 0 0 auto; align-items: center; gap: 8px; }
.case-study-topbar__action {
  display: inline-flex;
  flex: 0 0 auto;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 12px;
  border: var(--border-width-thin) solid var(--color-stroke-subtle);
  border-radius: var(--radius-sm);
  color: var(--color-text-primary);
  background: var(--color-background-secondary);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: .08em;
  line-height: 13px;
  white-space: nowrap;
}
.case-study-topbar__action:hover, .case-study-topbar__back:hover { color: var(--color-accent-purple); }
.case-study-topbar__action:focus-visible, .case-study-topbar__back:focus-visible { outline: 2px solid var(--color-accent-purple); outline-offset: 3px; }
.case-study-topbar__action.is-disabled, .case-study-topbar__action[aria-disabled="true"] { color: var(--muted); cursor: default; opacity: .45; }
@media (max-width: 640px) {
  .case-study-topbar { flex-wrap: wrap; align-items: flex-start; gap: 12px; padding: 12px 16px; }
  .case-study-topbar__context { align-items: flex-start; flex-direction: column; gap: 3px; }
  .case-study-topbar__breadcrumb { max-width: 210px; }
  .case-study-topbar__navigation { width: 100%; justify-content: flex-end; }
  .case-study-topbar__action { padding-right: 9px; padding-left: 9px; font-size: 9px; letter-spacing: .06em; }
}