Animated loader · gemma-4-26b-a4b-it

The objective is to build a single-page web app (SPA) in `index.html` featuring a looping loading animation using GSAP.
    - Background: Dark.
    - Elements:
        - Group of rounded geometric shapes (changing scale, position, corner radius).
        - A row of five dots (staggered motion or opacity).
    - Animation:
        - GSAP timeline (smooth easing).
        - 3 to 6 seconds duration.
        - Seamless loop.
    - Controls:
        - Pause/Resume.
        - Restart.
    - Constraints:
        - All-in-one `index.html` (CSS in `<style>`, JS in `<script>`).
        - No external assets/CDNs.
        - Use local `gsap.min.js` via `<script src="gsap.min.js"></script>`.
        - Centered composition.
        - No backend required.

    - HTML structure:
        - A container div for the animation.
        - A div for the geometric shapes.
        - A div for the dots.
        - A div for controls (buttons).
    - CSS:
        - Full-screen dark background.
        - Flex/Grid for centering.
        - Styling for shapes and dots.
        - Styling for buttons.
    - JS:
        - Wait for DOM/GSAP.
        - Create a GSAP timeline.
        - Define animations for shapes (scale, position, border-radius).
        - Define animations for dots (opacity or staggered movement).
        - Ensure seamless loop (e.g., using `repeat: -1` with `yoyo: true` or a timeline loop). Actually, the prompt says "repeats without an abrupt jump", so a seamless loop is best.
        - Implement control functions: `pause()`, `resume()`, `restart()`.

    - Use `gsap.timeline({ repeat: -1 })`.
    - To make it seamless, I'll design the animation so the end state matches the start state.
    - Shapes: A few `div` elements with various sizes. Animate `scale`, `x`, `y`, `borderRadius`.
    - Dots: Five `div` elements. Animate `opacity` or `y` with `stagger`.

    - `index.html` containing everything.
    - Check for `gsap.min.js` existence first (though I am told it is present).

    - `ls` to confirm `gsap.min.js` exists.
    - `write` `index.html`.
    - `browser` to test.

    - Dark background (e.g., `#111`).
    - Geometric shapes: 3-4 div elements.
    - Dots: 5 div elements in a row.
    - GSAP timeline duration: 4 seconds.
    - Controls: Simple buttons styled reasonably.

Let's start by checking the files.

Okay, `gsap.min.js` is present. I will now create `index.html`.

Plan for `index.html`:
- CSS:
    - `body` { background: #121212; color: white; display: flex; flex-direction: column; align-items: center; justify-content: center; height: 100vh; margin: 0; overflow: hidden; font-family: sans-serif; }
    - `.container` { position: relative; width: 400px; height: 400px; display: flex; align-items: center; justify-content: center; }
    - `.shape` { position: absolute; width: 100px; height: 100px; background: #3498db; border-radius: 20px; }
    - `.dot-container` { position: absolute; bottom: 50px; display: flex; gap: 10px; }
    - `.dot` { width: 12px; height: 12px; background: #e74c3c; border-radius: 50%; }
    - `.controls` { position: absolute; bottom: 20px; }
    - `button` { margin: 0 5px; padding: 10px 20px; cursor: pointer; }

- JS:
    - Select elements.
    - Create timeline.
    - `gsap.timeline({ repeat: -1, defaults: { ease: "power1.inOut" } })`
    - Shape 1: scale, x, y, borderRadius.
    - Shape 2: scale, x, y, borderRadius.
    - Dot animation: `gsap.to(".dot", { opacity: 0.3, stagger: 0.2, repeat: -1, duration: 1 })` - Wait, I should do it all in one timeline for better control, or use `repeat: -1` on the main timeline if I want it to loop seamlessly.

Wait, if I use `repeat: -1` on the timeline, I need to make sure the end state is the same as the start state.

Let's refine the timeline:
- 0s: Shape 1 (0, 0, radius 20%), Shape 2 (10, 10, radius 50%), Dots (opacity 1)
- 2s: Shape 1 (50, -50, radius 50%), Shape 2 (-50, 50, radius 20%), Dots (opacity 0.3, staggered)
- 4s: Same as 0s.

Actually, a better way for a seamless loop is to have the animation go from state A to state B and back (yoyo).
`gsap.timeline({ repeat: -1, yoyo: true, duration: 4 })`

Let's refine the shapes and dots.
Shapes:
- Square 1
- Square 2
- Square 3

Dots:
- 5 dots

Controls:
- Pause
- Resume
- Restart

I'll use `gsap.timeline({ repeat: -1, yoyo: true })` for the whole sequence.

Let's write the code.

Now I will use the `browser` tool to verify the implementation.
I need to check:
1. Visuals: dark background, shapes, dots.
2. Animation: smooth transitions, loop (yoyo).
3. Controls: Pause/Resume/Restart.
4. Seamless loop/no jumps.

The user wants me to build a looping loading animation using `gsap.min.js`.

Plan:
1.  Check if `gsap.min.js` exists in the current directory.
2.  Create an `index.html` file that includes:
    *   A dark background.
    *   A group of rounded geometric shapes (changing scale, position, corner radius).
    *   A row of five dots (staggered motion or opacity).
    *   GSAP timeline for coordinated animation (3-6 seconds, smooth looping).
    *   Pause, Resume, and Restart controls.
    *   Centered composition.
    *   Inline CSS and JS.
    *   Local `gsap.min.js` via `<script src="gsap.min.js"></script>`.
3.  Implement the animation logic.
4.  Verify the functionality.

Let's start by checking for `gsap.min.js`.