.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  padding-block: clamp(0.5rem, 2vw, 1.25rem);
}

.site-header .container {
  display: block;
}

.site-header-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding: 0.85rem 1.1rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.85);
  box-shadow: var(--shadow-sm);
  backdrop-filter: blur(12px);
  transition: all var(--transition-base);
}

.site-logo {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
}

.site-logo-mark {
  display: grid;
  place-items: center;
  width: 2.25rem;
  aspect-ratio: 1;
  border-radius: 50%;
  background: var(--color-ink);
  color: var(--color-paper-soft);
  font-family: var(--font-heading);
  font-size: 1.15rem;
  line-height: 1;
}

.site-logo-copy {
  display: flex;
  flex-direction: column;
}

.site-logo-name {
  font-family: var(--font-heading);
  font-size: clamp(1.25rem, 2vw, 1.5rem);
  font-weight: var(--weight-medium);
  line-height: 1;
  color: var(--color-ink);
}

.site-logo-tag {
  font-size: 0.6rem;
  font-weight: var(--weight-medium);
  letter-spacing: var(--tracking-wider);
  text-transform: uppercase;
  color: var(--color-text-faint);
  margin-top: 0.1rem;
}

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

.nav-links a {
  padding: 0.5rem 1rem;
  border-radius: var(--radius-full);
  color: var(--color-text-muted);
  font-size: var(--text-xs);
  font-weight: var(--weight-medium);
  letter-spacing: var(--tracking-wider);
  text-decoration: none;
  text-transform: uppercase;
  transition: all var(--transition-fast);
}

.nav-links a:hover,
.nav-links a[aria-current="page"] {
  background: var(--color-paper-deep);
  color: var(--color-ink);
}

.nav-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.25rem;
  height: 2.25rem;
  border: none;
  border-radius: 50%;
  background: transparent;
  color: var(--color-ink);
  cursor: pointer;
  transition: background var(--transition-fast);
}

.nav-toggle:hover {
  background: var(--color-paper-deep);
}

.nav-toggle svg {
  width: 1.2rem;
  height: 1.2rem;
}

.nav-mobile {
  display: none;
  flex-direction: column;
  gap: 0.25rem;
  width: min(100% - 3rem, var(--container-lg));
  margin: 0.5rem auto 0;
  padding: 0.5rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  background: rgba(255, 255, 255, 0.95);
  box-shadow: var(--shadow-md);
  backdrop-filter: blur(12px);
}

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

.nav-mobile a {
  padding: 0.75rem 1rem;
  border-radius: var(--radius-lg);
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  letter-spacing: var(--tracking-wider);
  text-decoration: none;
  text-transform: uppercase;
  transition: all var(--transition-fast);
}

.nav-mobile a:hover,
.nav-mobile a[aria-current="page"] {
  background: var(--color-paper-deep);
  color: var(--color-ink);
}

@media (min-width: 64em) {
  .nav-links {
    display: flex;
  }

  .nav-toggle {
    display: none;
  }

  .nav-mobile {
    display: none !important;
  }
}