/* ============================================================
   NAV — pairs with nav.html. Requires foundation.css tokens.
   ============================================================ */

.site-nav {
  position: fixed;
  top: env(safe-area-inset-top, 0px);
  left: 0;
  right: 0;
  z-index: 100;

  display: flex;
  justify-content: space-between;
  align-items: baseline;

  padding: var(--space-2) var(--space-3);
  font-family: var(--font-display);
  pointer-events: none; /* re-enabled on the children, so the
                            empty strip between them never blocks
                            clicks on content underneath */
}

.site-nav__mark,
.site-nav__links a {
  pointer-events: auto;
}

.site-nav__mark {
  font-size: var(--size-nav);
  letter-spacing: 0.01em;
  color: var(--color-fg);
  opacity: 0.9;
  transition: opacity var(--dur) var(--ease);
}

.site-nav__mark:hover {
  opacity: 1;
}

.site-nav__links {
  display: flex;
  gap: var(--space-3);
}

.site-nav__links a {
  position: relative;
  font-size: var(--size-nav);
  color: var(--color-fg-dim);
  transition: color var(--dur) var(--ease);
}

.site-nav__links a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -3px;
  height: 1px;
  background: currentColor;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--dur) var(--ease);
}

.site-nav__links a:hover,
.site-nav__links a:focus-visible {
  color: var(--color-red);
}

.site-nav__links a:hover::after,
.site-nav__links a:focus-visible::after {
  transform: scaleX(1);
}

.site-nav__links a[aria-current="page"] {
  color: var(--color-fg);
}

/* On the homepage specifically, add is-home to <header> so the
   wordmark hides — the name is already doing its job, huge,
   in the hero. No need to say it twice in one viewport. */
.site-nav.is-home .site-nav__mark {
  opacity: 0;
  pointer-events: none;
}

@media (max-width: 640px) {
  .site-nav {
    padding: var(--space-2);
  }
  .site-nav__mark {
    font-size: 0.8125rem;
  }
  .site-nav__links {
    gap: var(--space-2);
  }
}