/* ── Shared page header bar ─────────────────────────────────────────────────
   The one canonical header for every full-page view: optional back button,
   title, right-side actions. Replaces the former per-page duplicates
   (.page-panel-header, .project-page-header, .task-page-header,
   .llm-page-header, .um-header top bars, .apr-header, .llmr-header,
   .pv-header, .sa-header, .config-page-header, .agents-page-header).

   Markup contract:

     <div class="page-header">
       <div class="page-header-left">
         [<button class="btn btn-sm btn-outline-secondary page-header-back">…</button>]
         <h2 class="page-header-title">…</h2>
       </div>
       <div class="page-header-actions">
         [<span class="page-header-count">…</span>] [buttons…]
       </div>
     </div>

   Sticky so it stays pinned on pages whose container scrolls. */

.page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 20px;
  min-height: 54px;
  border-bottom: 1px solid var(--bs-border-color);
  background: var(--bs-tertiary-bg);
  flex-shrink: 0;
  position: sticky;
  top: 0;
  z-index: 20;
}

.page-header-left {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}

.page-header-back {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  padding: 0 !important;
  border-radius: 6px !important;
  flex-shrink: 0;
}

.page-header-back i {
  font-size: 1rem;
  line-height: 1;
}

.page-header-title {
  margin: 0;
  font-weight: 700;
  font-size: 1.05rem;
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 0;
}

.page-header-actions {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-left: auto;
  flex-shrink: 0;
}

.page-header-count {
  font-size: 0.82rem;
  color: var(--bs-secondary-color);
  font-weight: 500;
  white-space: nowrap;
}

@media (max-width: 600px) {
  .page-header {
    padding: 10px 14px;
    min-height: 50px;
  }
}