/**
 * Component: Primary Navigation
 * Mobile-first: collapsed into a toggled panel below 1024px, inline
 * horizontal nav from 1024px up.
 */

.primary-nav__toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  background: none;
  border: 1px solid var(--sf-border-strong);
  border-radius: var(--sf-radius-md);
}
.primary-nav__toggle-bar {
  position: relative;
  width: 18px; height: 2px;
  background: var(--sf-ink);
  display: block;
}
.primary-nav__toggle-bar::before,
.primary-nav__toggle-bar::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px; height: 2px;
  background: var(--sf-ink);
  transition: transform var(--sf-duration-base) var(--sf-ease);
}
.primary-nav__toggle-bar::before { top: -6px; }
.primary-nav__toggle-bar::after { top: 6px; }
.primary-nav__toggle[aria-expanded="true"] .primary-nav__toggle-bar { background: transparent; }
.primary-nav__toggle[aria-expanded="true"] .primary-nav__toggle-bar::before { transform: translateY(6px) rotate(45deg); }
.primary-nav__toggle[aria-expanded="true"] .primary-nav__toggle-bar::after { transform: translateY(-6px) rotate(-45deg); }

.primary-nav {
  position: fixed;
  inset: var(--sf-header-height) 0 0 0;
  background: var(--sf-paper);
  padding: var(--sf-space-6) var(--sf-container-pad);
  overflow-y: auto;
  transform: translateY(-8px);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--sf-duration-base) var(--sf-ease), transform var(--sf-duration-base) var(--sf-ease);
  z-index: var(--sf-z-nav);
}
.primary-nav.is-open {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.primary-nav ul { list-style: none; margin: 0; padding: 0; }
.primary-nav > div > ul > li + li { margin-top: var(--sf-space-1); }
.primary-nav a {
  display: block;
  padding: var(--sf-space-3) var(--sf-space-2);
  font-size: var(--sf-text-lg);
  font-weight: var(--sf-weight-medium);
  color: var(--sf-ink);
  text-decoration: none;
  border-bottom: 1px solid var(--sf-border);
}

.primary-nav .cluster { margin-top: var(--sf-space-6); }

@media (min-width: 1024px) {
  .primary-nav__toggle { display: none; }

  .primary-nav {
    position: static;
    inset: auto;
    background: none;
    padding: 0;
    opacity: 1;
    pointer-events: auto;
    transform: none;
    display: flex;
    align-items: center;
    gap: var(--sf-space-8);
    overflow: visible;
  }

  .primary-nav > div { display: flex; }
  .primary-nav ul { display: flex; align-items: center; gap: var(--sf-space-6); }
  .primary-nav > div > ul > li + li { margin-top: 0; }
  .primary-nav a {
    padding: var(--sf-space-2) 0;
    font-size: var(--sf-text-sm);
    border-bottom: none;
    position: relative;
  }
  .primary-nav a::after {
    content: "";
    position: absolute;
    left: 0; right: 0; bottom: -2px;
    height: 2px;
    background: var(--sf-indigo);
    transform: scaleX(0);
    transition: transform var(--sf-duration-fast) var(--sf-ease);
  }
  .primary-nav a:hover::after,
  .primary-nav .current-menu-item > a::after { transform: scaleX(1); }

  .primary-nav .cluster { margin-top: 0; }
}