.site-header {
  position: relative;
  z-index: 100;
  min-height: 5.25rem;
  border-bottom: 1px solid var(--border-color);
  background: var(--surface-page);
}

.site-header__inner {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  align-items: center;
  width: min(100%, var(--container-max));
  min-height: 5.25rem;
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.site-header__brand {
  display: inline-flex;
  grid-column: 2;
  align-items: center;
  justify-self: center;
  gap: 0.625rem;
  min-width: 0;
  color: var(--color-charcoal);
  font-size: 0.9375rem;
  font-weight: 500;
  letter-spacing: -0.01em;
  line-height: 1.2;
  text-decoration: none;
  white-space: nowrap;
}

.site-header__brand img {
  width: 1.875rem;
  height: 1.875rem;
  flex: 0 0 1.875rem;
  object-fit: contain;
}

.site-header__desktop-nav {
  min-width: 0;
}

.site-header__desktop-nav ul,
.site-header__mobile-nav ul {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-header__desktop-nav li,
.site-header__mobile-nav li,
.site-header__desktop-nav li + li,
.site-header__mobile-nav li + li {
  margin: 0;
  padding: 0;
}

.site-header__desktop-nav a,
.site-header__mobile-nav a {
  position: relative;
  display: inline-flex;
  align-items: center;
  min-height: 2.75rem;
  color: var(--color-charcoal);
  font-size: var(--text-sm);
  font-weight: 500;
  line-height: 1.2;
  text-decoration: none;
  white-space: nowrap;
}

.site-header__desktop-nav a::after,
.site-header__mobile-nav a::after {
  position: absolute;
  right: 0;
  bottom: 0.45rem;
  left: 0;
  height: 1px;
  background: currentColor;
  content: "";
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-fast);
}

.site-header__desktop-nav a:hover::after,
.site-header__desktop-nav a:focus-visible::after,
.site-header__desktop-nav a[aria-current="page"]::after,
.site-header__mobile-nav a:hover::after,
.site-header__mobile-nav a:focus-visible::after,
.site-header__mobile-nav a[aria-current="page"]::after {
  transform: scaleX(1);
}

.site-header__desktop-nav--left {
  grid-column: 1;
  justify-self: start;
}

.site-header__desktop-tools {
  display: flex;
  grid-column: 3;
  align-items: center;
  justify-self: end;
  gap: 1rem;
  min-width: 0;
}

.site-header__desktop-nav--right ul {
  justify-content: flex-end;
}

.site-header__age {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 2.25rem;
  min-height: 1.625rem;
  border: 1px solid var(--color-line-neutral);
  border-radius: 0.125rem;
  color: var(--color-charcoal);
  font-size: var(--text-xs);
  font-weight: 500;
  line-height: 1;
}

.site-header__age--mobile,
.site-header__toggle,
.site-header__mobile-nav {
  display: none;
}

.site-header__toggle {
  align-items: center;
  justify-content: center;
  width: 2.75rem;
  min-width: 2.75rem;
  height: 2.75rem;
  min-height: 2.75rem;
  margin: 0;
  padding: 0;
  border: 1px solid var(--color-charcoal);
  border-radius: var(--radius-button);
  background: transparent;
  color: var(--color-charcoal);
}

.site-header__toggle:hover {
  background: var(--color-charcoal);
  color: var(--color-snow-white);
}

.site-header__toggle-line {
  position: absolute;
  width: 1.125rem;
  height: 1px;
  background: currentColor;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.site-header__toggle-line:nth-child(1) { transform: translateY(-0.375rem); }
.site-header__toggle-line:nth-child(2) { transform: translateY(0); }
.site-header__toggle-line:nth-child(3) { transform: translateY(0.375rem); }

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

@media (max-width: 74.999rem) {
  .site-header__inner {
    min-height: 4.75rem;
  }

  .site-header__desktop-nav,
  .site-header__desktop-tools {
    display: none;
  }

  .site-header__age--mobile {
    display: inline-flex;
    grid-column: 1;
    justify-self: start;
  }

  .site-header__toggle {
    position: relative;
    display: inline-flex;
    grid-column: 3;
    justify-self: end;
  }

  .site-header__mobile-nav {
    position: absolute;
    z-index: 101;
    top: calc(100% - 1px);
    right: var(--gutter);
    left: var(--gutter);
    max-height: calc(100vh - 4.75rem);
    overflow-y: auto;
    border: 1px solid var(--border-color);
    background: var(--surface-page);
    box-shadow: var(--shadow-overlay);
  }

  .site-header__mobile-nav:not([hidden]) {
    display: block;
  }

  .site-header__mobile-nav ul {
    display: grid;
    gap: 0;
    padding: 0.75rem 1rem;
  }

  .site-header__mobile-nav li {
    border-bottom: 1px solid var(--border-color);
  }

  .site-header__mobile-nav li:last-child {
    border-bottom: 0;
  }

  .site-header__mobile-nav a {
    width: 100%;
    min-height: 3rem;
  }
}

@media (max-width: 39.999rem) {
  .site-header {
    min-height: 4.5rem;
  }

  .site-header__inner {
    min-height: 4.5rem;
  }

  .site-header__brand {
    gap: 0.5rem;
    font-size: 0.875rem;
  }

  .site-header__brand img {
    width: 1.625rem;
    height: 1.625rem;
    flex-basis: 1.625rem;
  }

  .site-header__mobile-nav {
    max-height: calc(100vh - 4.5rem);
  }
}

@media (prefers-reduced-motion: reduce) {
  .site-header__desktop-nav a::after,
  .site-header__mobile-nav a::after,
  .site-header__toggle-line {
    transition-duration: 0ms;
  }
}