C4 Architecture Documentation

Purpose

Document Riksdagsmonitor architecture using C4 model (Context, Container, Component, Code).

C4 Model Levels

Level 1: Context Diagram

Shows system in environment with users and external systems.

C4Context
  title System Context - Riksdagsmonitor

  Person(citizen, "Citizen", "Seeks political transparency")
  
  System(riksdag, "Riksdagsmonitor", "Static HTML/CSS website for Swedish Parliament monitoring")
  
  System_Ext(github_pages, "GitHub Pages", "Static site hosting with CDN")
  System_Ext(riksdag_api, "Riksdag-Regering MCP", "Swedish political data API (32 tools)")
  System_Ext(cia, "CIA Platform", "Political intelligence backend")
  
  Rel(citizen, riksdag, "Views political data", "HTTPS")
  Rel(riksdag, github_pages, "Hosted on", "HTTPS, TLS 1.3")
  Rel(riksdag, riksdag_api, "Fetches data via", "HTTP MCP")
  Rel(riksdag, cia, "Links to", "HTTPS")

Level 2: Container Diagram

Shows high-level technology choices.

C4Container
  title Container Diagram - Riksdagsmonitor

  Person(citizen, "Citizen")
  
  Container(web, "Web Application", "HTML5/CSS3", "Static website with 14 languages")
  Container(mcp, "MCP Servers", "Node.js", "riksdag-regering, filesystem, memory, git")
  Container(gh_actions, "GitHub Actions", "CI/CD", "Quality checks, deployment")
  
  ContainerDb(git_repo, "Git Repository", "GitHub", "Version control, content storage")
  
  System_Ext(github_pages, "GitHub Pages")
  System_Ext(riksdag_api, "Riksdagen API")
  
  Rel(citizen, web, "Views", "HTTPS")
  Rel(web, github_pages, "Hosted on")
  Rel(mcp, riksdag_api, "Fetches data")
  Rel(gh_actions, git_repo, "Deploys from")
  Rel(gh_actions, github_pages, "Publishes to")

Level 3: Component Diagram

Shows internal structure.

Documentation Structure

ARCHITECTURE.md Template:

# Architecture

## Executive Summary
## System Context (C4 Level 1)
## Container View (C4 Level 2)
## Component View (C4 Level 3)
## Technology Stack
## Security Architecture
## Deployment Pipeline
## References

References

• C4 Model: https://c4model.com
• ARCHITECTURE.md: Complete C4 models
• Mermaid Docs: https://mermaid.js.org/