The user wants an inline SVG illustration of a pelican riding a bicycle, delivered as a single-page web app in `index.html`.

Plan:
1.  Design a simple, clean SVG illustration of a pelican on a bicycle.
2.  Create an `index.html` file.
3.  Put the SVG inside the HTML, styled for centering and presentation.
4.  Include basic CSS and JS (though JS might not be necessary unless I want to add a small animation).

Pelican features:
- Big beak/pouch.
- Long legs.
- White/grey feathers.

Bicycle features:
- Two wheels.
- Frame.
- Handlebars.
- Pedals.

Composition:
- Pelican sitting on the seat.
- Feet on the pedals.
- Wings maybe balancing or holding the handlebars.

Let's make it look cute and minimalist.

SVG Details:
- Background: Simple light color.
- Pelican: White body, orange beak, black eye.
- Bicycle: Red or Blue frame, black wheels.

Wait, the prompt says "single-page web app". I'll make it a simple "Pelican Cycle" page where the SVG is the centerpiece, perhaps with a "Pedal!" button that makes the wheels rotate.

Let's refine the SVG:
- Wheels: circles with spokes.
- Frame: lines/paths.
- Pelican:
    - Body: ellipse.
    - Head: circle.
    - Beak: large custom path for the pouch.
    - Legs: lines.

I'll implement a simple CSS animation for the wheels and the pelican bobbing up and down to make it feel more like an "app".

I have created the `index.html` file with a self-contained SVG illustration of a pelican riding a bicycle. I've included some CSS animations to make it dynamic and a simple JS toggle to start/stop the animation.

The SVG consists of:
- A ground line.
- A bicycle frame, handlebars, seat, and wheels.
- A pelican with a large beak (pouch), body, head, and legs positioned on the bike.
- CSS animations for rotation (wheels) and bobbing (pelican).

The requirements were:
- Single-page web app.
- ALL in `index.html`.
- Inline CSS and JS.
- NO external resources.
- End with `index.html` present.

Everything is fulfilled.