.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
}
.primary-nav {
  position: relative;
}
.nav-menu {
  margin: 0;
}
@media (max-width: 768px) {
  .primary-nav {
    position: absolute;
    inset-inline: 0;
    top: 100%;
    background: radial-gradient(circle at top, #071f1a, #020504 60%);
    border-bottom: 1px solid rgba(16,185,129,0.35);
    box-shadow: 0 18px 40px rgba(0,0,0,0.8);
    transform-origin: top;
    transform: scaleY(0.9);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-base), transform var(--transition-base);
  }
  .primary-nav.is-open {
    opacity: 1;
    pointer-events: auto;
    transform: scaleY(1);
  }
  .nav-menu {
    display: flex;
    flex-direction: column;
    padding: var(--space-4) var(--space-5) var(--space-6);
    gap: var(--space-3);
  }
  .nav-link {
    padding-block: 0.3rem;
    font-size: var(--font-size-sm);
  }
}
@media (min-width: 769px) {
  .primary-nav {
    position: static;
  }
}
.nav-link {
  text-transform: uppercase;
  letter-spacing: 0.16em;
}
.nav-toggle {
  cursor: pointer;
}
.nav-toggle.is-active .nav-toggle-bar:nth-child(1) {
  transform: translateY(4px) rotate(40deg);
}
.nav-toggle.is-active .nav-toggle-bar:nth-child(2) {
  opacity: 0;
}
.nav-toggle.is-active .nav-toggle-bar:nth-child(3) {
  transform: translateY(-4px) rotate(-40deg);
}
.nav-toggle-bar {
  transition: transform var(--transition-fast), opacity var(--transition-fast), background-color var(--transition-fast);
}
.nav-toggle:focus-visible {
  box-shadow: var(--shadow-outline);
}
@media (prefers-reduced-motion: reduce) {
  .primary-nav {
    transition: none;
  }
  .nav-toggle-bar {
    transition: none;
  }
}

/* §10 hamburger X — 3 bars */
.nav-toggle {
  flex-direction: column;
  gap: 5px;
  width: 44px;
  height: 44px;
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) {
  opacity: 0;
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}