.site-nav {
  position: sticky;
  top: 0;
  z-index: 40;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-3);
  backdrop-filter: blur(16px);
  background: rgba(7, 9, 12, 0.72);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s ease, background 0.3s ease;
}

.site-nav.is-scrolled {
  border-bottom-color: var(--line);
  background: rgba(7, 9, 12, 0.9);
}

.site-nav__brand {
  font-family: var(--font-display);
  font-weight: 700;
  font-optical-sizing: none;
  font-size: var(--text-lg);
  line-height: 1.2;
  letter-spacing: -0.04em;
  color: var(--ink);
}

.site-nav__links {
  display: none;
  gap: 1.35rem;
}

.site-nav__links a {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 500;
  line-height: 1.2;
  letter-spacing: 0;
  color: var(--ink-soft);
  position: relative;
  /* Color + underline only — never change size/weight/tracking on hover */
  transition: color 0.2s ease;
}

.site-nav__links a:hover,
.site-nav__links a.is-active {
  color: var(--ink);
}

.site-nav__links a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -0.35rem;
  width: 100%;
  height: 2px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s var(--ease);
}

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

.site-nav__toggle {
  width: 2.5rem;
  height: 2.5rem;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  background: transparent;
}

.site-nav__toggle span,
.site-nav__toggle span::before,
.site-nav__toggle span::after {
  display: block;
  width: 1.1rem;
  height: 2px;
  background: var(--ink);
  position: relative;
}

.site-nav__toggle span::before,
.site-nav__toggle span::after {
  content: "";
  position: absolute;
  left: 0;
}

.site-nav__toggle span::before {
  top: -6px;
}

.site-nav__toggle span::after {
  top: 6px;
}

.site-nav.is-open .site-nav__links {
  display: flex;
  flex-direction: column;
  position: absolute;
  top: var(--nav-h);
  left: 0;
  right: 0;
  padding: var(--space-3);
  background: rgba(7, 9, 12, 0.96);
  border-bottom: 1px solid var(--line);
}

.site-nav.is-open .site-nav__links a {
  font-size: var(--text-sm);
  font-weight: 500;
  line-height: 1.2;
  letter-spacing: 0;
  padding: 0.35rem 0;
}

@media (min-width: 860px) {
  .site-nav {
    padding: 0 var(--space-4);
  }

  .site-nav__links {
    display: flex;
  }

  .site-nav__toggle {
    display: none;
  }
}