[data-c42-nav] {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  inline-size: 15rem;
  padding: 0.75rem;
  color: var(--c42-color-fg, #111827);
  background: var(--c42-color-bg, #ffffff);
  border-inline-end: 1px solid var(--c42-color-border, #e5e7eb);
  transition: inline-size var(--c42-transition, 200ms ease);
}

[data-c42-nav][data-collapsed='true'] {
  inline-size: 3.5rem;
}

[data-c42-nav] ul {
  display: flex;
  flex-direction: column;
  gap: 0.125rem;
  padding: 0;
  margin: 0;
  list-style: none;
}

[data-c42-nav-submenu][hidden],
[data-c42-nav-group][data-state='closed'] > [data-c42-nav-submenu] {
  display: none;
}

[data-c42-nav-item],
[data-c42-nav-trigger] {
  display: flex;
  gap: 0.5rem;
  align-items: center;
  inline-size: 100%;
  padding: 0.5rem 0.625rem;
  font: inherit;
  color: var(--c42-color-fg, #111827);
  text-align: start;
  text-decoration: none;
  background: transparent;
  border: 0;
  border-radius: var(--c42-radius-sm, 0.5rem);
  cursor: pointer;
}

[data-c42-nav-item]:hover,
[data-c42-nav-trigger]:hover {
  background: var(--c42-color-surface, #f9fafb);
}

[data-c42-nav-item]:focus-visible,
[data-c42-nav-trigger]:focus-visible {
  outline: 2px solid var(--c42-color-accent, #4f46e5);
  outline-offset: 2px;
}

[data-c42-nav-item][data-active] {
  font-weight: 600;
  color: var(--c42-color-accent, #4f46e5);
  background: var(--c42-color-surface, #f9fafb);
}

[data-c42-nav-trigger] {
  justify-content: space-between;
}

[data-c42-nav-trigger]::after {
  content: '▸';
  font-size: 0.75rem;
  transition: transform var(--c42-transition, 200ms ease);
}

[data-c42-nav-group][data-state='open'] > [data-c42-nav-trigger]::after {
  transform: rotate(90deg);
}

[data-c42-nav-submenu] {
  padding-inline-start: 0.75rem !important;
}

[data-c42-nav][data-collapsed='true'] [data-c42-nav-submenu],
[data-c42-nav][data-collapsed='true'] [data-c42-nav-trigger]::after {
  display: none;
}

[data-c42-nav-collapse] {
  align-self: flex-end;
  padding: 0.25rem 0.5rem;
  font: inherit;
  color: var(--c42-color-muted, #6b7280);
  background: transparent;
  border: 0;
  border-radius: var(--c42-radius-sm, 0.5rem);
  cursor: pointer;
}

[data-c42-nav-collapse]:hover {
  background: var(--c42-color-surface, #f9fafb);
}