# AGENTS.md

This file provides guidance to AI agents (OpenCode, Claude Code, etc.) when working with code in this repository.

## Project Overview

Interactive CV/portfolio website for Andy Charlwood with a distinctive loading experience: terminal boot sequence → ECG canvas animation with name tracing. Built as a React SPA with TypeScript and Vite.

## Commands

- `npm run dev` — Start dev server (localhost:5173)
- `npm run build` — TypeScript compile + Vite production build
- `npm run typecheck` — TypeScript type checking only (`tsc --noEmit`)
- `npm run lint` — ESLint
- `npm run preview` — Preview production build

No test framework is configured.

## Architecture

### Loading UI Flow

`App.tsx` manages a `Phase` state (`'boot'` → `'ecg'`). Each phase renders exclusively:

1. **BootSequence** — Terminal typing animation (~4s), green-on-black aesthetic
2. **ECGAnimation** — Canvas-based heartbeat animation (~5-6s) with letter tracing, background transitions from black to white

Total boot-to-ECG completion time must be ≤10 seconds.

### Key Patterns

- **Canvas ECG**: `ECGAnimation.tsx` does imperative canvas drawing with requestAnimationFrame — flatline → 3 heartbeats (40px→60px→100px) → letter tracing → exit.

### Path Aliases

`@/` maps to `./src/` (configured in both `vite.config.ts` and `tsconfig.json`).

### Styling

Tailwind CSS with custom design tokens in `tailwind.config.js`:
- **Colors**: teal `#00897B` (primary), coral `#FF6B6B` (accent), ECG palette (green/cyan/dim)
- **Fonts**: Plus Jakarta Sans (primary), Inter Tight (secondary), Fira Code (mono/terminal)
- **Breakpoints**: xs 480px, sm 640px, md 768px, lg 1024px, xl 1280px

### Type System

All data types live in `src/types/index.ts`. Strict TypeScript — no `any` types. One component per file with typed props interfaces.

## Guardrails

- Boot sequence text and colors must match `References/concept.html` exactly (CLINICAL TERMINAL v3.2.1 format).
- ECG animation timing/amplitudes/color transitions must match the concept reference.
- When writing components with visual styling or animations, invoke the `frontend-design` skill first.

## Available Skills

This project has access to the following agent skills in `.agents/skills/`:
- **frontend-design** — Use for any visual styling or animation work

## Project Structure

```
src/
├── components/    # One component per file (PascalCase)
├── hooks/         # Custom hooks (camelCase, use* prefix)
├── lib/           # Utility functions
├── types/         # TypeScript interfaces
├── App.tsx        # Phase manager (root component)
└── index.css      # Global styles + Tailwind directives
Ralph/             # Implementation plan, guardrails, progress tracking
References/        # Source content (concept.html, ECGVideo/)
```