.top-nav {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  overflow-x: auto;
  padding: 0 var(--space-6);
}

/* Inner wrapper centers nav items to match page content width */
.top-nav__inner {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  width: 100%;
  max-width: var(--top-nav-max-width, 1800px);
  margin: 0 auto;
}

.top-nav__item {
  position: relative;
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--color-text-secondary);
  white-space: nowrap;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  transition: color var(--transition-fast), border-color var(--transition-fast);
  cursor: pointer;
  background: none;
  border-top: none;
  border-left: none;
  border-right: none;
}
.top-nav__item:hover  { color: var(--color-text-primary); }
.top-nav__item.is-active {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}