# Theme management

## Managing themes

1. Go to **Theme** in the admin menu
2. **Activate** — Choose the active theme (stored in `config.json`)
3. **Compile SCSS** — Process SCSS to CSS (forced)
4. **New theme** — Create a custom theme via admin or manually

## Theme structure

```
themes/default/
├── theme.json              # { title, config.default_template, template: layout→.twig }
├── base.twig               # Main layout (head, header, nav, breadcrumb, footer)
├── full_content.twig       # Layout: full width
├── left_sidebar.twig       # Layout: sidebar on the left
├── right_sidebar.twig      # Layout: sidebar on the right
├── custom1.twig            # Layout: custom
├── guide.twig              # Layout: guide with sidebar (Navigation plugin)
├── partials/               # header.twig, navigation.twig, footer.twig
└── assets/
    ├── scss/theme.scss     # SCSS source (only CSS source — manual css/theme.css must not exist)
    ├── css_compiled/       # Generated by scssphp (read-only, do not edit manually)
    ├── css/                # External CSS (bootstrap.min.css, bootstrap-icons.css, mobile.css)
    ├── js/                 # app.js, bootstrap.bundle.min.js
    ├── fonts/              # bootstrap-icons.woff, woff2
    └── img/                # favicon, icon, world-map
```

## theme.json

```json
{
    "title": "default",
    "config": {
        "default_template": "full_content"
    },
    "template": {
        "full_content": "full_content.twig",
        "left_sidebar": "left_sidebar.twig",
        "right_sidebar": "right_sidebar.twig",
        "custom1": "custom1.twig",
        "guide": "guide.twig"
    }
}
```

- `title` — Display name in admin
- `config.default_template` — Default layout for pages without a `layout:` frontmatter
- `template` — Mapping from layout name to `.twig` file

## SCSS compilation

- `ThemeManager` compiles `assets/scss/theme.scss` at runtime to `assets/css_compiled/theme.css` via scssphp
- `css_compiled/` is **read-only** — do not edit manually
- `assets/css/theme.css` must **not** exist; otherwise `ThemeManager::getCssUrl()` ignores the SCSS
- After SCSS changes: remove `assets/css_compiled/theme.css` and `.mtime` to force recompilation

## Layouts

Layouts are chosen via the frontmatter `layout:` key in content files. Unknown layouts fall back to `config.default_template` from `theme.json`.

## guide.twig

Special layout for guides. Injects the Navigation plugin into the sidebar for sidebar navigation. Automatically used for pages in the `guide/` folder.