# Accordion

## Overview

The Accordion component in VulcanUI features a hierarchical structure that mirrors the actual HTML DOM. This documentation provides a comprehensive guide to all available BEM classes for the Sidebar styling and customization.

The Sidebar component follows a strict hierarchical structure with the root container `ds-sidebar__viewport` containing all sub-elements. Each level serves a specific purpose and can be styled independently.

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## Class hierarchy

The hierarchical class structure is as follows. Modifiers are in parenthesis.

```
 * ds-accordion (root --expanded --collapsed --draggable)
 * ├── ds-accordion__toggle (--disabled --expanded --collapsed)
 * ├── ds-accordion__content (--visible --hidden --animated)
 * ├── ds-accordion__header (--expanded --collapsed)
 * │   ├── ds-accordion__header-container
 * │   ├── ds-accordion__header-title
 * │   ├── ds-accordion__header-subtitle
 * │   ├── ds-accordion__header-details
 * │   └── ds-accordion__header-actions (--visible --hidden)
 * ├── ds-accordion__chevron (--expanded --collapsed)
 * │   └── ds-accordion__chevron-icon
 * ├── ds-accordion__drag
 * │   ├── ds-accordion__drag-handle
 * │   └── ds-accordion__drag-icon
 * └── ds-accordion__item (--active)
 *     └── ds-accordion__item-label
```

The below images map the classes of the Sidebar by number so when using them, you know which part to target specifically with your custom CSS stylesheet:

## Accordion classes


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