.jl-pageheader {
  display: flex; flex-direction: column; gap: var(--space-4);
  padding: var(--space-5) var(--space-8);
  background: var(--surface-card);
  border-bottom: 1px solid var(--border-subtle);
  box-sizing: border-box;
}
.jl-pageheader--plain { background: transparent; border-bottom: none; padding: var(--space-6) var(--space-8) var(--space-4); }
.jl-pageheader--sticky { position: sticky; top: 0; z-index: 5; }
.jl-pageheader--sticky.jl-pageheader { background: color-mix(in srgb, var(--surface-card) 88%, transparent); backdrop-filter: blur(8px); }

.jl-pageheader__crumb { min-height: 18px; }
.jl-pageheader__bar { display: flex; align-items: flex-start; gap: var(--space-4); }
.jl-pageheader__lead { flex: none; display: flex; align-items: center; gap: var(--space-2); padding-top: 2px; }

.jl-pageheader__back {
  flex: none; display: inline-flex; align-items: center; justify-content: center;
  width: 34px; height: 34px; cursor: pointer; color: var(--text-secondary);
  background: transparent; border: 1px solid var(--border-default); border-radius: var(--radius-lg);
  transition: background var(--duration-fast) var(--ease-standard), border-color var(--duration-fast) var(--ease-standard);
}
.jl-pageheader__back:hover { background: var(--surface-hover); border-color: var(--border-strong); color: var(--text-primary); }
.jl-pageheader__back:focus-visible { outline: none; box-shadow: var(--ring-focus); }
.jl-pageheader__back svg { width: 18px; height: 18px; }

.jl-pageheader__icon {
  flex: none; display: inline-flex; align-items: center; justify-content: center;
  width: 40px; height: 40px; color: var(--text-brand);
  background: var(--accent-subtle); border-radius: var(--radius-xl);
}
.jl-pageheader__icon svg { width: 22px; height: 22px; }

.jl-pageheader__heading { flex: 1 1 auto; min-width: 0; display: flex; flex-direction: column; gap: 4px; }
.jl-pageheader__eyebrow {
  font-size: var(--text-2xs); text-transform: uppercase; letter-spacing: var(--tracking-wider);
  font-weight: var(--weight-semibold); color: var(--text-tertiary);
}
.jl-pageheader__titlerow { display: flex; align-items: center; gap: var(--space-3); flex-wrap: wrap; }
.jl-pageheader__title {
  margin: 0; font-family: var(--font-display);
  font-size: var(--text-2xl); font-weight: var(--weight-semibold);
  letter-spacing: var(--heading-tracking); color: var(--text-primary); line-height: var(--leading-tight);
}
.jl-pageheader__desc { margin: 0; font-size: var(--text-md); color: var(--text-secondary); line-height: var(--leading-normal); max-width: 70ch; }

.jl-pageheader__actions { flex: none; display: flex; align-items: center; gap: var(--space-2); padding-top: 2px; }
.jl-pageheader__tabs { margin: 0 calc(var(--space-8) * -1) calc(var(--space-5) * -1); padding: 0 var(--space-8); }
.jl-pageheader--plain .jl-pageheader__tabs { margin-bottom: calc(var(--space-4) * -1); }

/* Responsive — Tier 1. Below mobile (--bp-mobile 600px) the title row and actions
   stack; the tabs row scrolls horizontally rather than wrapping. */
@media (max-width: 600px) {
  .jl-pageheader { padding-left: var(--space-5); padding-right: var(--space-5); }
  .jl-pageheader__bar { flex-wrap: wrap; }
  .jl-pageheader__actions { width: 100%; }
  .jl-pageheader__tabs { overflow-x: auto; scrollbar-width: none; }
  .jl-pageheader__tabs::-webkit-scrollbar { display: none; }
}