/*
  Letterhead: the logo sits in a masthead that scrolls away; only the rail
  below it stays pinned (sticky with a negative top equal to the masthead).
*/
.site-header {
  position: sticky;
  top: calc(-1 * var(--masthead-h));
  z-index: 10;
  background: var(--color-ground);
  border-bottom: var(--rule);
}

.site-header::before {
  content: "";
  position: absolute;
  inset: var(--masthead-h) 0 auto;
  border-top: var(--rule-soft);
}

/* Keyboard focus on a control hidden in the masthead brings it back */
.site-header:has(.site-header__logo:focus-visible, .site-header__cta:focus-visible, .lang__link:focus-visible) {
  top: 0;
}

.site-header__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  grid-template-rows: var(--masthead-h) auto;
  grid-template-areas:
    "cta logo lang"
    "nav nav nav";
  align-items: center;
  column-gap: var(--space-sm);
}

.site-header__logo {
  grid-area: logo;
  justify-self: center;
  height: calc(var(--masthead-h) - 2rem);
  aspect-ratio: 390 / 292;
}

.site-header__logo img {
  width: 100%;
  height: 100%;
}

.site-nav {
  grid-area: nav;
}

.site-nav__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  column-gap: clamp(0.375rem, 10vw - 1.5rem, 1.25rem);
  min-height: var(--rail-h);
}

/* On a phone the whole letterhead is set one size down so it fits one line */
.site-nav__link,
.lang__link,
.site-header__cta {
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  line-height: 1.4;
  text-transform: uppercase;
}

.site-nav__link {
  display: block;
  padding-block: var(--space-md);
}

.site-nav__link:hover,
.lang__link:hover {
  color: var(--color-accent-strong);
}

.lang {
  grid-area: lang;
  justify-self: end;
}

.lang__list {
  display: flex;
  margin-inline: -0.375rem;
}

.lang__link {
  display: block;
  padding: var(--space-xs) 0.375rem;
  color: var(--color-ink-soft);
}

.lang__link[aria-current="page"] {
  color: var(--color-ink);
  text-decoration: underline;
  text-decoration-color: var(--color-accent-strong);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.45em;
}

.site-header__cta {
  grid-area: cta;
  justify-self: start;
  padding-block: var(--space-xs);
  text-decoration: underline;
  text-decoration-color: var(--color-accent-strong);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.45em;
}

.site-header__cta:hover {
  color: var(--color-accent-strong);
}

@media (min-width: 48em) {
  .site-header:has(.site-header__cta:focus-visible, .lang__link:focus-visible) {
    top: calc(-1 * var(--masthead-h));
  }

  /* The rail holds the switcher, the links and the booking plate in one line */
  .site-header__inner {
    grid-template-columns: auto minmax(0, 1fr) auto;
    grid-template-areas:
      "logo logo logo"
      "lang nav cta";
    column-gap: var(--space-md);
  }

  .site-nav__list {
    column-gap: clamp(1rem, 4.6vw - 1rem, 2.75rem);
  }

  .site-nav__link,
  .lang__link,
  .site-header__cta {
    font-size: var(--text-label);
    letter-spacing: var(--tracking-caps);
  }

  .lang {
    justify-self: start;
  }

  .lang__list {
    gap: var(--space-2xs);
  }

  .site-header__cta {
    justify-self: end;
    padding: var(--space-xs) var(--space-md) var(--space-xs) calc(var(--space-md) + var(--tracking-caps));
    background: var(--color-ink);
    color: var(--color-ground);
    text-decoration: none;
  }

  .site-header__cta:hover {
    background: var(--color-accent-strong);
    color: var(--color-ground);
  }
}

/* Wide enough to centre the links on the page axis, under the logo */
@media (min-width: 80em) {
  .site-header__inner {
    grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  }
}

@media (prefers-reduced-motion: no-preference) {
  .site-nav__link,
  .lang__link,
  .site-header__cta {
    transition: color var(--dur) var(--ease), background-color var(--dur) var(--ease);
  }
}