.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  height: var(--nav-height);
  background: var(--color-bg-nav);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}

.site-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-sm);
  width: min(100% - 1.5rem, var(--max-width));
  height: 100%;
  margin-inline: auto;
}

.nav-brand {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--color-text);
  letter-spacing: -0.02em;
}

.nav-brand:hover,
.nav-brand:focus-visible {
  color: var(--color-accent);
}

.nav-toggle {
  display: none;
  width: 2.75rem;
  height: 2.75rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: transparent;
  color: var(--color-text);
  cursor: pointer;
  font-size: 1.25rem;
  line-height: 1;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  list-style: none;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  min-height: 2.75rem;
  padding: 0.5rem 0.85rem;
  border-radius: var(--radius);
  color: var(--color-text-muted);
  font-weight: 500;
  font-size: 0.95rem;
}

.nav-link:hover,
.nav-link:focus-visible {
  color: var(--color-text);
  background: var(--color-accent-soft);
}

.nav-link[aria-current="page"],
.nav-link[aria-current="page"]:hover,
.nav-link[aria-current="page"]:focus-visible {
  color: var(--color-on-accent);
  background: var(--color-accent);
  font-weight: 700;
}

@media (max-width: 860px) {
  .nav-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  .nav-links {
    position: fixed;
    inset: var(--nav-height) 0 auto 0;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0.15rem;
    padding: var(--space-sm);
    background: var(--color-bg-elevated);
    border-bottom: 1px solid var(--color-border);
  }

  .nav-links.is-open {
    display: flex;
  }

  .nav-link {
    width: 100%;
    justify-content: flex-start;
    padding: 0.85rem 1rem;
  }
}