/* ============================================================
   HEADER — LAYOUT B
   Centered: logo centered top, nav centered below it
   Full-width underline, no right-side CTA buttons in nav row
   ============================================================ */

.header-b {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--nav-bg);
  border-bottom: 1px solid var(--nav-border);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: background-color 0.4s ease, border-color 0.4s ease;
}

.header-b-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 1rem 0 0;
  gap: 0;
}

/* ── Logo row ──────────────────────────────────────────── */
.header-b-top {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  padding-bottom: 0.85rem;
  position: relative;
}

.header-b-top .header-logo {
  font-family: var(--font-heading);
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--color-heading);
  display: flex;
  align-items: center;
  gap: 0.6rem;
  letter-spacing: -0.02em;
  transition: color 0.3s ease;
}

.header-b-top .header-logo:hover { color: var(--color-primary); }

.header-b-top .logo-mark {
  width: 32px; height: 32px;
  background-color: var(--color-primary);
  border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  font-size: 0.9rem; font-weight: 900;
  color: var(--color-btn-text);
  flex-shrink: 0;
  transition: background-color 0.3s ease;
}

/* CTA tucked to the right absolutely */
.header-b-top .header-b-cta {
  position: absolute;
  right: 1.5rem;
  display: flex;
  gap: 0.6rem;
}

.header-b-top .header-b-cta .btn {
  padding: 0.5rem 1.1rem;
  font-size: 0.85rem;
}

/* ── Nav row ───────────────────────────────────────────── */
.header-b-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
  border-top: 1px solid var(--color-border);
  width: 100%;
}

.header-b-nav a {
  padding: 0.7rem 1.4rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-muted);
  position: relative;
  transition: color 0.2s ease;
}

.header-b-nav a::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 2px;
  background-color: var(--color-primary);
  transform: scaleX(0);
  transition: transform 0.2s ease;
}

.header-b-nav a:hover { color: var(--color-heading); }
.header-b-nav a:hover::after { transform: scaleX(1); }

/* ── Mobile toggle ─────────────────────────────────────── */
.header-b-top .mobile-toggle {
  display: none;
  position: absolute;
  right: 1rem;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 0.5rem;
  border: none;
  background: none;
}

.header-b-top .mobile-toggle span {
  display: block; width: 24px; height: 2px;
  background-color: var(--color-text);
  border-radius: 2px;
  transition: all 0.3s ease;
}

/* ── Mobile menu ───────────────────────────────────────── */
.mobile-menu {
  display: none;
  flex-direction: column;
  border-top: 1px solid var(--color-border);
  padding: 1rem 0;
  background-color: var(--nav-bg);
  width: 100%;
}

.mobile-menu a {
  padding: 0.75rem 1.5rem;
  font-size: 0.95rem; font-weight: 500;
  color: var(--color-text);
  transition: color 0.2s ease, background-color 0.2s ease;
}

.mobile-menu a:hover {
  color: var(--color-primary);
  background-color: var(--color-primary-soft);
}

.mobile-menu .mobile-menu-actions {
  display: flex; gap: 0.75rem;
  padding: 1rem 1.5rem 0;
  border-top: 1px solid var(--color-border);
  margin-top: 0.5rem;
}

/* ── Responsive ─────────────────────────────────────────── */
@media (max-width: 768px) {
  .header-b-nav,
  .header-b-top .header-b-cta { display: none; }
  .header-b-top .mobile-toggle { display: flex; }
  .mobile-menu.is-open { display: flex; }
}