Vant Design Spec (Vant 4 / Vue 3)

Constraint: Only use this skill when the user explicitly mentions "Stitch".

Purpose

This skill makes the Vant 4 design spec executable in two modes:

1. Prefix mode: output a paste-ready Hard constraints prefix for Stitch [Context].
2. Selector mode: output CONTRACT_SELECTION_JSON_V1 and then an assembled Stitch prompt that injects only the required component/state snippets.

Trigger Keywords

Prefer this skill when the user request includes any of:

• vant, vant4, vant-ui, vant ui

Chinese trigger keywords (only for triggering):

• vant 风格
• vant 组件库

Source of Truth

• references/contract.md
• references/examples.md
• references/official.md

Output (STRICT)

Decide the mode by the user intent:

• If the user asks for beautify/polish/refine an existing screen, or asks for selector / JSON / contracts.include / states.include → use Selector mode.
• Otherwise → use Prefix mode.

Prefix mode

Return exactly one code block:

[Hard constraints prefix]
- Framework: Vant 4 (Vue 3 / Mobile).
- Design Tokens:
  - Colors: Primary=#1989fa (Blue), Success=#07c160, Warning=#ff976a, Danger=#ee0a24.
  - Background: Page=#f7f8fa, Card=#ffffff.
  - Typography: Base 14px.
  - Radius: sm=2px, md=4px, lg=8px.
- Component Contracts:
  - Layout: Use <van-row>, <van-col span="...">. Container: <van-config-provider>.
  - List/Card: Use <van-cell-group inset> for card style groups.
  - Buttons: Use <van-button type="primary" round block>.
  - Forms: Use <van-form>, <van-field>, <van-search>, <van-picker>, <van-date-picker>.
  - Business: <van-card> (Product), <van-submit-bar>, <van-address-list>, <van-coupon-list>.
  - Navigation: <van-nav-bar>, <van-tabbar>, <van-sidebar>, <van-tabs>.
  - Feedback: <van-action-sheet>, <van-swipe-cell>, <van-empty>.
- Layout Invariants:
  - Mobile First (375px base).
  - Use Flexbox for alignment.
  - Respect Safe Area.

Selector mode

Return exactly two code blocks, in this order, with no extra prose:

1. Contract selection JSON:

{
  "version": "CONTRACT_SELECTION_JSON_V1",
  "designSystem": "vant4",
  "mode": "selector",
  "contracts": { "include": [] },
  "states": { "include": [] }
}

2. Final Stitch prompt:

[Context]
(Paste Hard Constraints Prefix here)
(Add "Layout Invariants" from contract.md if beautifying)

[Layout]
(Describe the macro layout structure, e.g., "Mobile Column Layout with Navbar")

[Components]
(Inject component snippets matching the JSON selection above)

References

• Contract
• Examples
• Official Docs