/* Section: site header */
.site-header {
  position: sticky;
  inset-block-start: 0;
  z-index: 50;
  background: var(--paper);
  border-block-end: 1px solid var(--rule);
}
.site-header__inner {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  min-block-size: var(--header-h);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: .75rem;
  margin-inline-end: auto;
  text-decoration: none;
}
.brand__mark {
  inline-size: 2.75rem;
  block-size: 2.75rem;
  border-radius: 50%;
}
.brand__name {
  font: 500 1.5rem/1 var(--font-display);
  letter-spacing: -.01em;
}

.site-nav__list {
  display: flex;
  align-items: center;
  gap: clamp(1rem, 2.4vw, 2.25rem);
}
.site-nav__list a {
  display: inline-block;
  padding-block: .5rem;
  font-size: 1rem;
  font-weight: 500;
  text-decoration: none;
  background: linear-gradient(var(--terracotta), var(--terracotta)) no-repeat 0 100% / 0 2px;
  transition: background-size .25s;
}
[dir="rtl"] .site-nav__list a { background-position: 100% 100%; }
.site-nav__list a:hover,
.site-nav__list a[aria-current="page"] { background-size: 100% 2px; }

/* Language switcher: every language, the current one marked like the current nav link and not linked. */
.site-lang {
  padding-inline-start: 1.5rem;
  border-inline-start: 1px solid var(--rule);
}
.site-lang__list {
  display: flex;
  align-items: center;
  gap: 1rem;
}
.site-lang__list :is(a, span) {
  display: inline-block;
  padding-block: .5rem;
  font-size: 1rem;
  font-weight: 500;
  text-decoration: none;
  background: linear-gradient(var(--terracotta), var(--terracotta)) no-repeat 0 100% / 0 2px;
  transition: background-size .25s;
}
[dir="rtl"] .site-lang__list :is(a, span) { background-position: 100% 100%; }
/* A link in another script keeps the page direction, so it lines up with its neighbours */
.site-lang__list [dir] { direction: inherit; unicode-bidi: isolate; }
.site-lang__list a:hover,
.site-lang__list [aria-current="true"] { background-size: 100% 2px; }

.site-header__cta { min-block-size: 2.75rem; padding-block: .6rem; }
.site-header__cta:hover { background: var(--forest); border-color: var(--forest); color: var(--paper); }

.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  inline-size: 2.75rem;
  block-size: 2.75rem;
  padding: 0;
  border: 1.5px solid var(--forest);
  border-radius: 2px;
  background: transparent;
  color: var(--forest);
  cursor: pointer;
}
.nav-toggle svg { inline-size: 1.25rem; block-size: 1.25rem; }
.nav-toggle .nav-toggle__close,
.nav-toggle[aria-expanded="true"] .nav-toggle__open { display: none; }
.nav-toggle[aria-expanded="true"] .nav-toggle__close { display: block; }

/* Wider than the other sections' 53.75em: the four links, the three languages and the
   button need about 1020px in one row. */
@media (max-width: 64em) {
  .site-header__inner { flex-wrap: wrap; gap: .5rem; }
  .brand { gap: .5rem; }
  .brand__mark { inline-size: 2.5rem; block-size: 2.5rem; }
  .brand__name { font-size: 1.375rem; }
  .site-header__cta { padding-inline: .875rem; }
  .site-nav { order: 3; inline-size: 100%; }
  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding-block-end: 1rem;
  }
  .site-nav__list li { border-block-start: 1px solid var(--rule); }
  .site-nav__list a { display: block; padding-block: .9rem; font-size: 1.125rem; background: none; }
  .site-lang { order: 4; inline-size: 100%; padding-inline-start: 0; border-inline-start: 0; }
  .site-lang__list { flex-direction: column; align-items: stretch; gap: 0; padding-block-end: 1rem; }
  .site-lang__list li { border-block-start: 1px solid var(--rule); }
  .site-lang__list :is(a, span) { display: block; padding-block: .9rem; font-size: 1.125rem; background: none; }
  .site-lang__list [aria-current="true"] {
    text-decoration: underline 2px var(--terracotta);
    text-underline-offset: .35em;
  }
  /* With the script running the menu is collapsed behind the toggle. */
  .js .nav-toggle { display: inline-flex; }
  .js .site-nav,
  .js .site-lang { display: none; }
  .js .site-header.is-open .site-nav,
  .js .site-header.is-open .site-lang { display: block; }
}
@media (max-width: 23em) {
  .brand__mark { display: none; }
  .brand__name { font-size: 1.25rem; }
  .site-header__cta { padding-inline: .55rem; font-size: .9375rem; }
  .nav-toggle { inline-size: 2.5rem; }
}