/* Mobile navigation — shared by every page.
   Below 520px the header links collapse into a toggle menu.
   Loaded after each page's inline <style>, so these rules win. */

.nav-toggle {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  margin-right: -10px;
  padding: 0;
  background: none;
  border: 0;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 1.5px;
  border-radius: 1px;
  background: var(--ink);
  transition: transform 0.25s ease, opacity 0.2s ease;
}

.nav-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-6.5px) rotate(-45deg);
}

@media (max-width: 520px) {
  .nav-toggle {
    display: flex;
  }

  /* The same <ul> as desktop — collapsed into a panel under the header. */
  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    padding: 4px var(--pad, 24px) 12px;
    background: var(--bg);
    border-bottom: 1px solid var(--rule);
  }

  .nav-links.open {
    display: flex;
  }

  .nav-links li + li {
    border-top: 1px solid var(--rule);
  }

  .nav-links a {
    display: block;
    padding: 15px 0;
    font-size: 0.8125rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .nav-toggle span {
    transition: none;
  }
}