Initial commit: Cosmic Garden idle game foundation

- Complete game architecture with modular JS structure
- 12 buildings across 4 tiers with scaling costs
- 15+ upgrades with requirements and bonuses
- 20 achievements to unlock
- Auto-save system with offline progress (50% efficiency)
- Export/Import save functionality
- Responsive dark-themed UI with cosmic aesthetic
- Floating text animations and notification system

README.md

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+# Cosmic Garden 🌌🌱
+
+An idle/clicker game where you grow a cosmic garden in space!
+
+## Features
+
+- **Click to harvest** stardust
+- **12 unique plants** to grow across 4 tiers
+- **15+ upgrades** to boost your production
+- **20 achievements** to unlock
+- **Auto-save** with offline progress
+- **Export/Import** saves
+- **Responsive design** - works on desktop and mobile
+
+## How to Play
+
+1. Click the "Collect Stardust" button to earn ✨
+2. Buy plants to generate stardust automatically
+3. Purchase upgrades to boost production
+4. Unlock achievements as you progress
+5. Watch your cosmic garden grow!
+
+## Development
+
+This is an ongoing project. Check `JOURNAL.md` for development logs.
+
+## Running Locally
+
+Just open `index.html` in any modern browser. No build step required!
+
+## Tech Stack
+
+- Vanilla JavaScript (no frameworks)
+- CSS Grid/Flexbox for layout
+- localStorage for persistence
+- Base64 export/import for sharing saves