# huihuilikaile/ctf-btfly-hmtl architecture

> Architecture diagram of the GitHub repository huihuilikaile/ctf-btfly-hmtl, generated by GitDiagram from its file tree, README and a sample of source files (last updated 2026-09-29). It is an AI-made overview: check details against the source.

- Interactive diagram: https://gitdiagram.com/huihuilikaile/ctf-btfly-hmtl
- Repository: https://github.com/huihuilikaile/ctf-btfly-hmtl

## Overview

This is a small browser-based site with a light/dark theme toggle. On startup, its script reads a saved theme and checks the system color preference; when the user clicks the toggle, it changes the document root’s theme class and saves the selection. The source excerpt does not establish how the HTML loads the script or stylesheet, so those connections are omitted.

Main entry points: [`app.js`](https://github.com/huihuilikaile/ctf-btfly-hmtl/blob/main/app.js) (Theme script)

## Diagram (Mermaid)

```mermaid
flowchart TD

node_visitor(("Visitor"))
node_page["Site page<br/>[index.html]"]
node_theme["Theme script<br/>[app.js]"]
node_root["Document root"]
node_preference["System preference"]
node_saved_theme[("Saved theme")]

node_visitor -->|"clicks toggle"| node_theme
node_theme -->|"reads theme"| node_saved_theme
node_theme -->|"checks preference"| node_preference
node_theme -->|"toggles class"| node_root
node_theme -->|"saves theme"| node_saved_theme

click node_page "https://github.com/huihuilikaile/ctf-btfly-hmtl/blob/main/index.html"
click node_theme "https://github.com/huihuilikaile/ctf-btfly-hmtl/blob/main/app.js"

classDef toneNeutral fill:#f8fafc,stroke:#334155,stroke-width:1.5px,color:#0f172a
classDef toneBlue fill:#dbeafe,stroke:#2563eb,stroke-width:1.5px,color:#172554
classDef toneAmber fill:#fef3c7,stroke:#d97706,stroke-width:1.5px,color:#78350f
classDef toneMint fill:#dcfce7,stroke:#16a34a,stroke-width:1.5px,color:#14532d
classDef toneRose fill:#ffe4e6,stroke:#e11d48,stroke-width:1.5px,color:#881337
classDef toneIndigo fill:#e0e7ff,stroke:#4f46e5,stroke-width:1.5px,color:#312e81
classDef toneTeal fill:#ccfbf1,stroke:#0f766e,stroke-width:1.5px,color:#134e4a
class node_visitor,node_root,node_preference toneIndigo
class node_page,node_theme toneTeal
class node_saved_theme toneAmber
```

## Components

### Other components

- **Visitor**
- [Site page](https://github.com/huihuilikaile/ctf-btfly-hmtl/blob/main/index.html): `index.html`
- [Theme script](https://github.com/huihuilikaile/ctf-btfly-hmtl/blob/main/app.js): `app.js`
- **Document root**
- **System preference**
- **Saved theme**

## Connections

- Visitor → Theme script: clicks toggle
- Theme script → Saved theme: reads theme
- Theme script → System preference: checks preference
- Theme script → Document root: toggles class
- Theme script → Saved theme: saves theme