**Designing the Single-Page App**

I'm focusing on the core challenge: crafting that all-in-one HTML file. The key is to embed everything – the SVG pelican illustration, CSS styling, and JavaScript interactivity – directly within the `index.html` structure. This no-external-resource constraint is driving the design. I'm exploring the best approach for inlining the SVG while keeping it manageable and efficient.


**Drafting the SVG Components**

I'm now deep-diving into the SVG design itself. I've roughed out basic elements: the pelican's body as an ellipse and the beak as a path. I'm focusing on crafting a visual metaphor of a pelican riding a bicycle. The challenge is balancing simplicity with recognizability; I want a clear image using basic shapes. It's a sketch in progress, but I have a direction in mind: legs connected to pedals, body holding the handlebars, and the beak pointing forward. I'm leaning toward using custom CSS within a `<style>` block to keep things self-contained.


**Constructing the Bicycle Geometry**

I've moved on to the bicycle itself, focusing on its fundamental geometry. I've used `<circle />` for the wheels and `<line />` elements for the frame. I'm aiming for a simplified design, using basic shapes. It's a quick draft to establish proportions, with elements of the pelican superimposed on the bike. The code is coming together, with the HTML structure, CSS styling, and SVG elements integrated into a single file.