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

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(18px);
  background: rgba(255, 255, 255, 0.84);
  border-bottom: 1px solid rgba(27, 95, 209, 0.08);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  padding-block: 0.9rem;
}

.site-brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  min-width: 0;
}

.site-brand__logo {
  width: 4.5rem;
  height: 4.5rem;
  flex: none;
}

.site-brand__text {
  font-family: var(--font-display);
  font-size: clamp(1.35rem, 2vw, 2.2rem);
  line-height: 1;
  color: var(--color-primary);
}

.site-nav {
  position: fixed;
  inset: calc(100% + 1px) 0 auto;
  padding: 0 1rem 1rem;
  opacity: 0;
  pointer-events: none;
  transform: translateY(-1rem);
  transition: opacity var(--transition-base), transform var(--transition-base);
}

.site-nav.is-open {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.site-nav__list {
  display: grid;
  gap: 0.75rem;
  list-style: none;
  margin: 0;
  padding: 1rem;
  background: rgba(255, 255, 255, 0.98);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
}

.site-footer {
  padding: var(--space-2xl) 0 var(--space-xl);
}

.site-footer__inner {
  display: grid;
  gap: var(--space-lg);
  padding: var(--space-xl);
  background: linear-gradient(180deg, rgba(27, 95, 209, 0.05), rgba(27, 95, 209, 0.12));
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.site-footer__contact {
  display: grid;
  justify-items: start;
  gap: var(--space-sm);
}

@media (min-width: 64rem) {
  .site-nav {
    position: static;
    inset: auto;
    padding: 0;
    opacity: 1;
    pointer-events: auto;
    transform: none;
  }

  .site-nav__list {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0;
    background: transparent;
    border: 0;
    border-radius: 0;
    box-shadow: none;
  }

  .site-footer__inner {
    grid-template-columns: 1.4fr 0.8fr;
    align-items: center;
  }

  .site-footer__contact {
    justify-items: center;
  }
}