header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 32px var(--gutter) 0;
  box-sizing: border-box;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  mix-blend-mode: difference;
  color: white;
  user-select: none;
  -webkit-user-select: none;
  z-index: 99;
}

header a {
  color: white;
  text-decoration: none;
  font-size: .75rem;
  text-transform: uppercase;
  letter-spacing: 0;
}

.site-logo { font-size: 16px; }

.site-nav { display: flex; gap: 24px; font-size: 16px; }

.site-nav a { transition: text-shadow 0.2s ease; }
.site-nav a:hover,
.site-nav a.is-active {
  text-shadow: var(--glow-inverted);
}