# Style Contract

The deck should reproduce the 科大讯飞 reference deck's quality and interaction behavior, while remaining adaptable to other companies.

## Default Palette

Use this palette unless the user gives a different preference:

- `--bg`: `#eef3f6`
- `--paper`: `#fffdf8`
- `--ink`: `#253142`
- `--sub`: `#657184`
- `--line`: `#dbe1e6`
- `--primary`: `#2f77a3`
- `--primary-dark`: `#2d4f6f`
- `--gold`: `#c7923e`
- `--soft-blue`: `#e8f3fa`
- `--soft-gold`: `#f5ead4`

## Avoid By Default

- Dark green as the visual identity.
- Black theme.
- Red theme.
- Purple theme or purple AI gradients.
- Decorative orbs, blob backgrounds, bokeh, generic SaaS hero sections.

## Typography

- Chinese business deck: `PingFang SC`, `Microsoft YaHei`, `Hiragino Sans GB`.
- Large titles can use a Songti-style serif for stronger editorial presence.
- Do not scale font size with viewport width.
- Letter spacing should be `0` except small uppercase kickers.

## Composition

- Stage is 16:9.
- Deck has a subtle border, quiet shadow, and 8-10px radius.
- Slides use a soft grid background.
- Every slide has a kicker, strong title, and footer.
- Cards stay simple: 8px radius, light border, no nested cards.
- For dense content, split pages instead of reducing the text until it becomes unreadable.

## Interaction

Preserve these effects from the reference:

- Previous/next circular controls.
- Keyboard navigation: arrows, PageUp/PageDown, Home/End, Space.
- URL hash navigation by slide number.
- Bottom progress bar.
- Print CSS that reveals all slides as pages.
- Mobile CSS that stacks grids and allows scroll.

