.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(8px);
  background: rgba(13, 16, 20, 0.88);
  border-bottom: 1px solid var(--line);
}

.site-header-inner {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  line-height: 0;
}

.brand-mark-image {
  display: block;
  height: auto;
  width: auto;
}

.brand-mark-header {
  width: 98px;
  max-width: 26vw;
}

.brand-mark-footer {
  width: 116px;
  max-width: 34vw;
}

.menu-toggle {
  display: none;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--text);
  padding: 0.45rem 0.7rem;
}

.site-nav ul {
  display: flex;
  list-style: none;
  gap: var(--space-3);
  margin: 0;
  padding: 0;
}

.site-nav a {
  display: inline-block;
  padding: 0.35rem 0;
  border-bottom: 1px solid transparent;
  color: var(--muted);
}

.site-nav a:hover,
.site-nav a:focus-visible,
.site-nav a[aria-current="page"] {
  color: var(--text);
  border-bottom-color: var(--accent);
}

.site-footer {
  border-top: 1px solid var(--line);
  margin-top: var(--space-8);
  padding: var(--space-6) 0;
}

.footer-grid {
  display: grid;
  gap: var(--space-4);
  grid-template-columns: 1.4fr 1fr 1fr;
}

.footer-nav {
  list-style: none;
  margin: 0;
  padding: 0;
}

.footer-nav li + li {
  margin-top: 0.5rem;
}

@media (max-width: 900px) {
  .menu-toggle {
    display: inline-flex;
  }

  .site-nav {
    position: absolute;
    right: 1rem;
    top: 62px;
    width: min(85vw, 320px);
    background: var(--bg-soft);
    border: 1px solid var(--line);
    padding: var(--space-3);
    display: none;
  }

  .site-nav.open {
    display: block;
  }

  .site-nav ul {
    flex-direction: column;
    gap: var(--space-2);
  }

  .footer-grid {
    grid-template-columns: 1fr;
  }
}