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+# Design Document
+
+## Overview
+
+This design outlines a simple, cross-platform demo application built with GLFW3 for window management and Nuklear for immediate mode GUI rendering. The application is designed to be minimal and straightforward, serving as a basic example of integrating these technologies.
+
+The core design principle is simplicity - create a working demo that shows basic Nuklear GUI elements in a GLFW window with minimal code complexity.
+
+## Architecture
+
+The application uses a simple, single-file architecture:
+
+```
+┌─────────────────────────────────┐
+│         Main Application        │  ← Single main.c file
+│  ┌─────────────────────────────┐ │
+│  │    GLFW3 Window Setup       │ │  ← Window creation & events
+│  ├─────────────────────────────┤ │
+│  │    Nuklear Integration      │ │  ← GUI context & rendering
+│  ├─────────────────────────────┤ │
+│  │    Simple UI Demo           │ │  ← Basic UI components
+│  └─────────────────────────────┘ │
+└─────────────────────────────────┘
+```
+
+### Key Design Decisions
+
+1. **Single File**: Everything in one main.c file for simplicity
+2. **OpenGL Backend**: Using Nuklear's OpenGL3 backend for cross-platform compatibility
+3. **Minimal Dependencies**: Only GLFW3, OpenGL, and Nuklear (header-only)
+4. **Basic UI Elements**: Simple buttons, text, and input fields for demonstration
+
+## Components and Interfaces
+
+### Main Application Structure
+The application consists of simple functions organized in a single file:
+
+```c
+// Core application functions
+int main(int argc, char** argv);
+void init_glfw(void);
+void init_nuklear(void);
+void render_ui(struct nk_context* ctx);
+void cleanup(void);
+
+// Simple state variables
+static GLFWwindow* window;
+static struct nk_context* ctx;
+static int window_width = 800;
+static int window_height = 600;
+```
+
+### Basic UI Demo Functions
+Simple functions to demonstrate different Nuklear UI elements:
+
+```c
+// Demo UI functions
+void demo_basic_widgets(struct nk_context* ctx);
+void demo_text_input(struct nk_context* ctx);
+void demo_buttons(struct nk_context* ctx);
+```
+
+## Data Models
+
+### Simple State Variables
+The demo uses minimal global state:
+
+```c
+// UI state for demo
+static char text_buffer[256] = "Hello World!";
+static float slider_value = 0.5f;
+static int checkbox_value = 1;
+static int option_selected = 0;
+```
+
+## Error Handling
+
+### Simple Error Handling
+Basic error checking with immediate exit on failure:
+
+```c
+// Simple error checking pattern
+if (!glfwInit()) {
+    fprintf(stderr, "Failed to initialize GLFW\n");
+    exit(EXIT_FAILURE);
+}
+
+if (!window) {
+    fprintf(stderr, "Failed to create window\n");
+    glfwTerminate();
+    exit(EXIT_FAILURE);
+}
+```
+
+## Testing Strategy
+
+### Manual Testing
+- **Build Testing**: Verify compilation on Windows, Linux, and macOS
+- **Visual Testing**: Ensure UI elements render correctly
+- **Interaction Testing**: Test basic button clicks, text input, and sliders
+- **Window Testing**: Test window resize and close functionality
+
+## Implementation Notes
+
+### Build System
+- **Simple Makefile or CMake**: Basic build configuration
+- **Dependencies**: GLFW3, OpenGL, Nuklear (single header file)
+- **Compiler**: C99 standard for maximum compatibility
+
+### File Structure
+```
+project/
+├── main.c              # Single source file
+├── nuklear.h           # Nuklear header (downloaded)
+├── nuklear_glfw_gl3.h  # Nuklear GLFW+OpenGL3 backend
+├── CMakeLists.txt      # Build configuration
+└── README.md           # Build instructions
+```
+
+### Cross-Platform Notes
+- Use GLFW3 for consistent window management across platforms
+- OpenGL 3.3 core profile for modern graphics support
+- Standard C library functions only for maximum portability