.site-header {
  position: sticky;
  z-index: 100;
  top: 0;
  width: 100%;
  border-bottom: 1px solid var(--colour-line-dark);
  background: var(--colour-charcoal-950);
  color: var(--colour-ivory-100);
}

.site-header__inner {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  min-height: 4.75rem;
  gap: var(--space-5);
}

.site-header__brand,
.site-header__brand:hover {
  display: inline-flex;
  flex: 0 0 auto;
  align-items: center;
  gap: var(--space-3);
  color: var(--colour-ivory-100);
  text-decoration: none;
}

.site-header__logo {
  flex: 0 0 2.625rem;
  width: 2.625rem;
  height: 2.625rem;
  max-width: none;
  object-fit: contain;
}

.site-header__wordmark {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.05em;
}

.site-header__nav {
  min-width: 0;
}

.site-header__nav-list {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: clamp(0.75rem, 1.5vw, 1.5rem);
  min-width: 0;
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-header__nav-list li,
.site-header__nav-list li + li {
  display: flex;
  min-width: 0;
  margin: 0;
  padding: 0;
}

.site-header__nav-link {
  display: inline-flex;
  align-items: center;
  min-height: 3rem;
  padding: 0.25rem 0;
  border-bottom: 2px solid transparent;
  color: var(--colour-ivory-100);
  font-family: var(--font-heading);
  font-size: 0.875rem;
  font-weight: 500;
  line-height: 1.1;
  letter-spacing: -0.02em;
  text-decoration: none;
  white-space: nowrap;
  transition: border-color var(--transition-control), color var(--transition-control);
}

.site-header__nav-link:hover,
.site-header__nav-link[aria-current="page"] {
  border-color: var(--colour-cobalt-400);
  color: var(--colour-ivory-100);
  text-decoration: none;
}

.site-header__reserve {
  flex: 0 0 auto;
  min-width: 0;
  white-space: nowrap;
}

.site-header__toggle,
.site-header__nav-mobile {
  display: none;
}

.site-header a:focus-visible,
.site-header button:focus-visible {
  outline-color: var(--colour-ivory-100);
}

@media (max-width: 68rem) {
  .site-header__inner {
    grid-template-columns: auto auto auto;
    justify-content: space-between;
    min-height: 4.25rem;
    gap: var(--space-3);
  }

  .site-header__logo {
    flex-basis: 2.125rem;
    width: 2.125rem;
    height: 2.125rem;
  }

  .site-header__wordmark {
    font-size: 1.25rem;
  }

  .site-header__toggle {
    display: inline-grid;
    grid-template-rows: repeat(3, 2px);
    align-content: center;
    justify-items: stretch;
    width: 3rem;
    height: 3rem;
    padding: 0.75rem;
    border: 1px solid var(--colour-line-dark);
    border-radius: var(--radius-control);
    background: transparent;
    color: var(--colour-ivory-100);
    gap: 0.3125rem;
    transition: border-color var(--transition-control), background-color var(--transition-control);
  }

  .site-header__toggle:hover,
  .site-header__toggle[aria-expanded="true"] {
    border-color: var(--colour-cobalt-400);
    background: var(--colour-charcoal-850);
  }

  .site-header__toggle-line {
    display: block;
    width: 100%;
    height: 2px;
    background: currentColor;
    transform-origin: center;
    transition: transform var(--transition-control), opacity var(--transition-control);
  }

  .site-header__toggle[aria-expanded="true"] .site-header__toggle-line:nth-child(1) {
    transform: translateY(0.4375rem) rotate(45deg);
  }

  .site-header__toggle[aria-expanded="true"] .site-header__toggle-line:nth-child(2) {
    opacity: 0;
  }

  .site-header__toggle[aria-expanded="true"] .site-header__toggle-line:nth-child(3) {
    transform: translateY(-0.4375rem) rotate(-45deg);
  }

  .site-header__nav {
    position: absolute;
    z-index: 101;
    top: 100%;
    right: 0;
    left: 0;
    display: none;
    max-height: calc(100vh - 4.25rem);
    overflow-y: auto;
    border-top: 1px solid var(--colour-line-dark);
    border-bottom: 1px solid var(--colour-line-dark);
    background: var(--colour-charcoal-850);
    box-shadow: var(--shadow-floating);
  }

  .site-header__nav[data-open="true"] {
    display: block;
  }

  .site-header__nav-list {
    display: grid;
    justify-content: stretch;
    gap: 0;
    width: min(100% - (var(--container-gutter) * 2), 40rem);
    margin-inline: auto;
    padding-block: var(--space-3);
  }

  .site-header__nav-list li,
  .site-header__nav-mobile {
    display: block;
  }

  .site-header__nav-link {
    display: flex;
    min-height: 3.25rem;
    padding-inline: var(--space-2);
    border-bottom: 1px solid var(--colour-line-dark);
    font-size: 1rem;
  }
}

@media (max-width: 24rem) {
  .site-header__inner {
    gap: var(--space-2);
  }

  .site-header__brand {
    gap: var(--space-2);
  }

  .site-header__reserve {
    min-height: 2.75rem;
    padding-inline: 0.625rem;
    font-size: 0.8125rem;
  }
}