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# Quality Guidelines
> Frontend quality constraints for JSP/CSS pages.
---
## Overview
Frontend work should implement JSP/CSS pages that match the approved
image-first design and preserve the Servlet/JSP layered architecture.
---
## Image-To-JSP Workflow
1. Design or generate the UI as images first.
2. Use the approved image as the visual reference for JSP/CSS implementation.
3. Restore layout, spacing, typography, color, table density, and form states
faithfully in JSP/CSS.
4. Preserve the image assets or references in the application assets area once
the source tree exists.
5. Compare the implemented page against the source image before considering UI
work complete.
---
## Required Patterns
- JSP pages focus on display and user interaction.
- Forms submit to Servlet controllers and render server-provided validation
messages.
- Tables and reports support scanning for books, readers, borrowing records,
rankings, inventory, overdue data, and system logs.
- Navigation should reflect role permissions for administrator, librarian, and
reader users.
- Keep CSS and small scripts in static assets rather than inline unless there
is a local reason.
---
## Forbidden Patterns
- Do not introduce React, Vue, SPA routing, hook/state conventions, or
TypeScript tooling without an explicit stack change.
- Do not implement UI only from text descriptions when an approved image
reference exists.
- Do not put SQL, DAO calls, or business workflows in JSP pages.
- Do not rely only on browser validation for protected workflows.
---
## Review Checklist
- Does the JSP/CSS page visibly match the approved image design?
- Are forms, tables, empty states, errors, and permission-specific navigation
handled?
- Are JSPs rendered through Servlet controllers where access control or page
data is required?
- Are accessibility basics preserved with labels, headings, focus order, and
readable contrast?