.skip-to-content {
  position: absolute;
  right: 0; 
  padding: var(--_);
  transform: translateY(-100%);
  transition: transform var(--transition-speed);
}

.skip-to-content:focus {
  transform: translateY(0);
}

.site-navigation {
  display: block;
  width: 100%;
}

.site-navigation ul {
  display: none;
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-navigation li {
  position: relative;
}

.site-navigation a {
  display: block;
  text-decoration: none;
}

/* Small menu. */
.site-navigation[active] ul {
  display: block;
}

.site-navigation-toggle {
  background-color: transparent;
  border: 0;
  cursor: pointer;
}

.site-navigation-toggle .toggle-line {
  width: 2rem;
  height: .1875rem;
  background-color: var(--color-black);
  margin: .5rem 0;
  transition: var(--transition-speed) ease-in-out;
}

.site-navigation-toggle .toggle-line-3, 
.site-navigation-toggle .toggle-line-4 {
  position: relative;
  top: -.6875rem;
}

.site-navigation-toggle[aria-expanded="true"] .toggle-line-1 {
  -webkit-transform: scaleX(0);
  transform: scaleX(0);
  opacity: 0;
}

.site-navigation-toggle[aria-expanded="true"] .toggle-line-2 {
  -webkit-transform: rotate(-45deg) scaleX(1.05);
  transform: rotate(-45deg) scaleX(1.05);
}

.site-navigation-toggle[aria-expanded="true"] .toggle-line-3 {
  -webkit-transform: rotate(45deg) scaleX(1.05);
  transform: rotate(45deg) scaleX(1.05);
}

.site-navigation-toggle[aria-expanded="true"] .toggle-line-4 {
  -webkit-transform: scaleX(0);
  transform: scaleX(0);
  opacity: 0;
}

@media screen and (min-width: 640px) {
  .site-navigation-toggle {
    display: none;
  }

  .site-navigation ul {
    display: flex;
  }
}