.site-header {
  border-bottom: 1px solid var(--coe-border);
  background: color-mix(in srgb, var(--coe-bg-deep) 85%, var(--coe-bg-panel));
  position: sticky;
  top: 0;
  z-index: 100;
}

.site-header__inner {
  max-width: var(--coe-max-width);
  margin: 0 auto;
  padding: 0.85rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.site-header__brand {
  display: flex;
  flex-direction: column;
  text-decoration: none;
  line-height: 1.2;
}

.site-header__title {
  color: var(--coe-text-title);
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.site-header__subtitle {
  color: var(--coe-text-muted);
  font-size: var(--coe-font-size-caption);
  font-weight: 400;
}

.site-header__nav {
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
  font-size: var(--coe-font-size-body);
}

.site-header__nav a {
  display: inline-flex;
  align-items: center;
  min-height: 2.75rem;
  text-decoration: none;
  color: var(--coe-text-muted);
}

.site-header__nav a:hover {
  color: var(--coe-text-title);
}

@media (max-width: 640px) {
  .site-header__inner {
    padding: 0.75rem 1rem;
    gap: 0.75rem;
  }

  .site-header__nav {
    gap: 0.75rem 1rem;
    font-size: 0.875rem;
  }
}