/* ==========================================================================
   OpenFold, Sticky navigation
   ========================================================================== */

.site-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(35, 38, 45, 0.85);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--color-band-border);
}

.site-nav__inner {
  max-width: var(--maxw);
  margin-inline: auto;
  padding: 0.75rem var(--space);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.site-nav__brand {
  display: inline-flex;
  align-items: center;
  flex-shrink: 0;
}

.site-nav__brand img {
  height: 28px;
  width: auto;
}

.site-nav__brand-text {
  font-weight: 800;
  font-size: 1.35rem;
  letter-spacing: -0.02em;
  color: var(--color-text-primary);
}

/* Center links */
.site-nav__links {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  list-style: none;
}

.site-nav__links a {
  display: block;
  padding: 0.5rem 0.85rem;
  border-radius: 8px;
  color: var(--color-ghost-gray);
  font-size: 1.1rem;
  font-weight: 500;
  transition: color 0.18s ease, background-color 0.18s ease;
}

.site-nav__links a:hover {
  color: var(--color-text-primary);
  background-color: rgba(148, 163, 184, 0.08);
}

.site-nav__links a.is-active {
  color: var(--color-text-primary);
  background-color: rgba(59, 130, 246, 0.15);
}

.site-nav__right {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-shrink: 0;
}

/* Hamburger toggle */
.site-nav__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 42px;
  height: 42px;
  padding: 0;
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  cursor: pointer;
}

.site-nav__toggle span {
  display: block;
  width: 20px;
  height: 2px;
  margin-inline: auto;
  background-color: var(--color-text-primary);
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.site-nav__toggle[aria-expanded='true'] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.site-nav__toggle[aria-expanded='true'] span:nth-child(2) {
  opacity: 0;
}

.site-nav__toggle[aria-expanded='true'] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* --- Mobile (< 768px) ----------------------------------------------------- */
@media (max-width: 767px) {
  .site-nav__toggle {
    display: flex;
    order: 3;
  }

  .site-nav__menu {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    background-color: var(--color-band);
    border-bottom: 1px solid var(--color-band-border);
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 0.75rem var(--space) 1.25rem;
    display: none;
  }

  .site-nav__menu.is-open {
    display: flex;
  }

  .site-nav__links {
    flex-direction: column;
    align-items: stretch;
    gap: 0.15rem;
    width: 100%;
  }

  .site-nav__links a {
    padding: 0.75rem 0.85rem;
    font-size: 1.15rem;
  }

  .site-nav__right {
    margin-top: 0.75rem;
    width: 100%;
  }

  .site-nav__right .btn {
    width: 100%;
  }
}

/* On desktop the menu is always visible; toggle hidden */
@media (min-width: 768px) {
  .site-nav__menu {
    display: flex !important;
    flex: 1;
    align-items: center;
    gap: 1rem;
  }

  /* Center the link group; push the Launch Portal button to the far right */
  .site-nav__links {
    margin-inline: auto;
  }
}