.site-shell {
  width: var(--shell-width);
  margin: 0 auto;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -3rem;
  padding: 0.75rem 1rem;
  background: var(--color-ink);
  color: var(--color-paper-soft);
  z-index: 30;
}

.skip-link:focus {
  top: 1rem;
}

.site-header {
  padding: 1.6rem 0 0;
}

.site-header__inner {
  display: grid;
  grid-template-columns: 160px minmax(0, 1fr) 170px;
  gap: 1.5rem;
  align-items: center;
}

.site-header__mark,
.site-header__nav a,
.site-header__stamp,
.site-footer__copyright {
  font-size: 0.76rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.site-header__mark {
  display: inline-flex;
  align-items: center;
}

.site-header__mark img {
  width: 5rem;
  height: 5rem;
  object-fit: contain;
  filter: grayscale(1) contrast(1.05);
}

.site-header__toggle {
  display: none;
  align-items: center;
  justify-content: center;
  justify-self: end;
  width: 3rem;
  height: 3rem;
  padding: 0;
  border: 1px solid var(--color-line-strong);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.38);
  color: var(--color-ink);
  cursor: pointer;
}

.site-header__toggle span {
  display: block;
  width: 1.1rem;
  height: 1px;
  background: currentColor;
  transition:
    transform var(--transition),
    opacity var(--transition);
}

.site-header__toggle span + span {
  margin-top: 0.25rem;
}

.site-header__nav {
  display: flex;
  justify-content: center;
  gap: 2.4rem;
  flex-wrap: wrap;
}

.site-header__nav a {
  position: relative;
  padding-bottom: 0.4rem;
  transition: color var(--transition);
}

.site-header__nav a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: var(--color-line-strong);
  opacity: 0;
  transform-origin: left center;
  transition:
    opacity var(--transition),
    transform var(--transition);
}

.site-header__nav a.is-active::after {
  opacity: 1;
}

.site-header__stamp {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 0.22rem;
  color: var(--color-muted);
}

.site-footer {
  padding: 2.2rem 0 2rem;
}

.site-footer__inner {
  display: flex;
  justify-content: flex-end;
  padding-top: 1rem;
  border-top: 1px solid var(--color-line);
}

.site-footer__copyright {
  margin: 0;
  color: var(--color-muted);
  font-weight: 700;
}