| name | blueprinter |
| description | Generate technical diagrams using HTML/CSS in Flat Engineering Blueprint style. Use when the user wants to create architecture diagrams, system diagrams, flowcharts, or technical specification sheets that look like engineering blueprints. Triggers on requests for flat diagrams, blueprint-style visualizations, or technical drawings. |
Blueprinter
Generate technical diagrams using HTML/CSS following the "Flat Engineering Blueprint" style guidelines.
Core Philosophy
Precise, Objective, High Data-Ink Ratio. The output should look like a technical specification sheet or an architectural diagram, NOT a marketing landing page.
Visual Rules
1. No Decorations
- NO drop shadows
- NO gradients
- NO glassmorphism/blur
- NO rounded buttons
2. Flat & Outlined
- Use 1px or 2px solid borders for structure
- Use white backgrounds for content blocks
3. Monochrome Base
| Element | Color |
|---|
| Background | Light Gray (#f8fafc) |
| Canvas | White (#ffffff) with Slate Border (#cbd5e1) |
| Text (Main) | High contrast Black (#0f172a) |
| Text (Sub) | Slate Gray (#64748b) |
| Accent | Use BLACK or ONE semantic color (e.g., Red for Error) sparingly |
4. Typography
- Headings/Labels: Sans-serif (Inter/Helvetica)
- Data/Paths/Code: Monospace (JetBrains Mono/Consolas)
5. Layout Structure
- The diagram must be contained within a
diagram-canvas (a bordered box with padding)
- Header: Title + Uppercase Subtitle, separated by a solid bottom border
- Grid/Flexbox alignment: Everything must be strictly aligned
6. Elements
- Connectors: Thin, straight or orthogonal lines. Dashed lines for abstract relationships.
- Icons: Simple stroke SVG icons (no fill or complex details)
- Badges: Outlined or solid black/gray blocks. Small font size.
CSS Variable Reference
:root {
--c-bg: #f8fafc;
--c-canvas: #ffffff;
--c-border: #cbd5e1;
--c-text-main: #0f172a;
--c-text-sub: #64748b;
--font-ui: 'Inter', sans-serif;
--font-mono: 'JetBrains Mono', monospace;
}
HTML Structure Template
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>[Diagram Title]</title>
<link href="https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600&family=JetBrains+Mono:wght@400;500&display=swap" rel="stylesheet">
<style>
:root {
--c-bg: #f8fafc;
--c-canvas: #ffffff;
--c-border: #cbd5e1;
--c-text-main: #0f172a;
--c-text-sub: #64748b;
--c-accent: #dc2626;
--font-ui: 'Inter', sans-serif;
--font-mono: 'JetBrains Mono', monospace;
}
* {
margin: 0;
padding: 0;
box-sizing: border-box;
}
body {
: (--font-ui);
: (--c-bg);
: ;
: ;
}
{
: ;
: auto;
}
{
: (--c-canvas);
: solid (--c-border);
: ;
}
{
: solid (--c-border);
: ;
: ;
}
{
: ;
: ;
: (--c-text-main);
: ;
}
{
: ;
: ;
: (--c-text-sub);
: uppercase;
: ;
}
{
: solid (--c-border);
: ;
: (--c-canvas);
}
{
: (--font-mono);
: ;
: (--c-text-sub);
: uppercase;
: ;
}
{
: (--font-mono);
: ;
: (--c-text-main);
: ;
}
{
: (--c-border);
: ;
}
{
: (--c-border);
: ;
: ;
}
{
: inline-block;
: (--font-mono);
: ;
: ;
: solid (--c-border);
: (--c-text-sub);
}
{
: (--c-text-main);
: (--c-canvas);
: (--c-text-main);
}
[Diagram Title]
[Diagram Type / Version]
Usage Guidelines
- Always use the CSS variables - never hardcode colors
- Keep it flat - no shadows, no gradients, no blur effects
- Use monospace for data - any technical values, paths, codes should use
--font-mono
- Align strictly - use CSS Grid or Flexbox with consistent gaps
- Connect with lines - use SVG for connectors between components
- Minimal icons - if icons are needed, use simple stroke-only SVGs
Example: Simple System Diagram
<div class="diagram-canvas">
<div class="diagram-header">
<div class="diagram-title">System Architecture</div>
<div class="diagram-subtitle">v1.0 / Overview</div>
</div>
<div style="display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 24px;">
<div class="component">
<div class="component-label">Client</div>
<div class="component-value">Web App</div>
</div>
<div class="component">
<div class="component-label">API</div>
<div class="component-value">REST Gateway</div>
</>
Database
PostgreSQL
