# Image Split Cards

> One image laid over a row of cards. Pinned while you scroll, it splits along the gaps, then each piece turns over to show its card, one after the other. Scroll back and the picture comes back together.

Scroll · scroll, image, cards, flip, 3d, split, features, landing · HTML, CSS, vanilla JS · no dependencies · updated 2026-11-06
Demo: https://kodza.dev/components/image-split-cards/
Source on GitHub: https://github.com/kodza-dev/kodza/tree/main/components/image-split-cards

Takes the whole screen (or reacts to the page scroll): give it a page, not a small box.

## Files

The code below, served as files: byte for byte what the Kodza site copies (the CSS includes its theme guard).

- [`kodza-image-split-cards.css`](https://kodza.dev/registry/image-split-cards/kodza-image-split-cards.css) · 19.4 KB
- [`kodza-image-split-cards.js`](https://kodza.dev/registry/image-split-cards/kodza-image-split-cards.js) · 12.7 KB
- [`kodza-image-split-cards.html`](https://kodza.dev/registry/image-split-cards/kodza-image-split-cards.html) · 1.9 KB · the markup, to adapt and paste into your page

**Can you run shell commands? Download the CSS and the JS, don't retype them.** Retyping costs thousands of tokens and can drop or change lines of the CSS. Put the files where your stack expects them (Use it says where: change the `-o` paths):

```bash
curl -fsSL --create-dirs -o kodza/kodza-image-split-cards.css https://kodza.dev/registry/image-split-cards/kodza-image-split-cards.css
curl -fsSL --create-dirs -o kodza/kodza-image-split-cards.js https://kodza.dev/registry/image-split-cards/kodza-image-split-cards.js
```

Then load the files from your page as Use it shows, instead of pasting the content. The HTML is the part you adapt (text, links, modifiers): paste it from the Code section. Copy the CSS and the JS from the Code section only if you can't run commands, exactly as they are. (Windows PowerShell: `curl.exe`.)

**Its images are free to use in what you ship** (Kodza house images, Kodza License). The HTML loads them from kodza.dev, whose addresses can change: copy them into the project and point each `src` to the copy (a Claude artifact embeds them instead, as Use it says).

```bash
curl -fsSL --create-dirs -o kodza/media/kz-repeat-1400.webp https://kodza.dev/media/kz-repeat-1400.webp
curl -fsSL --create-dirs -o kodza/media/kz-repeat-2400.webp https://kodza.dev/media/kz-repeat-2400.webp
```

## API

- Root: `[data-kodza-image-split-cards]`
- Variables (set them on the root element itself: it declares its own defaults):
  - `--kz-image-split-cards-width: 1080px`
  - `--kz-image-split-cards-gutter: 24px`
  - `--kz-image-split-cards-gap: 16px`
  - `--kz-image-split-cards-height: clamp(300px, 52svh, 440px)`
  - `--kz-image-split-cards-height-stacked: clamp(150px, 21svh, 200px)`
  - `--kz-image-split-cards-distance: 150svh`
  - `--kz-image-split-cards-position: 50% 50%`
  - `--kz-image-split-cards-radius: calc(16px * var(--kz-radius-scale, 1))`
  - `--kz-image-split-cards-ink: var(--kz-color-ink, #0a0a0a)`
  - `--kz-image-split-cards-muted: color-mix(in srgb, var(--kz-image-split-cards-ink) 62%, transparent)`
  - `--kz-image-split-cards-surface: var(--kz-color-paper, #ffffff)`
  - `--kz-image-split-cards-border: color-mix(in srgb, var(--kz-image-split-cards-ink) 10%, transparent)`
  - `--kz-image-split-cards-shade: #0a0a0a`
  - `--kz-image-split-cards-mono: var(--kz-font-mono, "Geist Mono", ui-monospace, SFMono-Regular, Menlo, monospace)`
- Attributes:
  - `data-kodza-image-split-cards`
- Lifecycle: `kodza:init` / `kodza:destroy` on `document`, with `{ detail: { root } }` to target a container.

## Images

The shape of each image slot, measured in the demo at 1440 × 900 (desktop) and 390 × 844 (mobile). Where the shape is fixed, the frame crops the image to it: export in that shape, keep the subject near the centre, at twice the widest size shown (sharp on retina screens).

| Slot | Desktop | Mobile | Widest shown |
| --- | --- | --- | --- |
| `.kodza-image-split-cards__image` | 3:1 | 1.71:1 | 1080 px |

## Dark mode

The values Kodza uses on a dark background (`#0a0a0a`). For a page that follows the system theme, add them after the component's CSS:

```css
@media (prefers-color-scheme: dark) {
  .kodza-image-split-cards {
    --kz-image-split-cards-ink: #f2f2f0;
    --kz-image-split-cards-muted: rgba(242, 242, 240, 0.62);
    --kz-image-split-cards-surface: #161616;
    --kz-image-split-cards-border: rgba(255, 255, 255, 0.12);
    --kz-image-split-cards-shade: #000;
  }
}
```

A site with its own theme switch puts the same rules under its dark selector instead (`[data-theme="dark"] .kodza-image-split-cards { … }`); a single dark section, under that section's class.

Its images have dark versions next to them (`kz-repeat-1400.webp` → `kz-repeat-dark-1400.webp`). To swap them on a dark page: `<picture><source media="(prefers-color-scheme: dark)" srcset="…-dark-….webp"><img …></picture>`.

## Use it

### Plain HTML page

- CSS: `kodza/kodza-image-split-cards.css` next to the page (the Files commands as they are), linked in `<head>`: `<link rel="stylesheet" href="kodza/kodza-image-split-cards.css">`. Without a shell, paste it in a `<style>` in `<head>` instead. It only touches `kodza-` classes.
- HTML: where the component goes. Paste it as many times as you need: instances never interfere.
- JS: `kodza/kodza-image-split-cards.js`, loaded with `<script src="kodza/kodza-image-split-cards.js" defer></script>` in `<head>`. Without a shell, paste it in a `<script>` before `</body>` (or in `<head>`: it waits for the page). One copy per page, whatever the number of instances.
- Restyle with the `--kz-…` variables, set on the component's root element itself (the root declares its own defaults, so a value on an ancestor is ignored), and with the modifiers / attributes listed under API.
- Font: it takes the page's own. A site with its own type sets it once for every Kodza component, on `:root`, never by editing the CSS (unset, nothing changes): `--kz-font-display`, the display face (headings, big numbers, wordmarks); `--kz-font-display-weight`, its weight; `--kz-font-display-scale`, a multiplier on its sizes (1 by default); `--kz-font-display-tracking`, its letter-spacing; `--kz-font-display-case`, its case (`uppercase`…); `--kz-font-label`, the face of the small labels (meta, captions, counters, hints, footer links, button labels); `--kz-font-label-size`, their size, one for all of them (`11px`…); `--kz-font-label-weight`, their weight; `--kz-font-label-tracking`, their letter-spacing; `--kz-font-label-case`, their case (`uppercase`…; code and units keep theirs); `--kz-font-label-leading`, their line-height (`1.45`…; buttons, pills and keys keep their box); `--kz-font-mono`, the monospace face (code, labels, counters). The Kodza look is Geist: `<link rel="stylesheet" href="https://fonts.googleapis.com/css2?family=Geist:wght@400;500;600;700&family=Geist+Mono:wght@400;500&display=swap">`.
- Corners: a site with its own shapes sets them once for every Kodza component, on `:root`, never by editing the CSS (unset, nothing changes): `--kz-radius-scale` multiplies every corner (`0` square, `0.5` softer, `1` Kodza).
- Motion: a site sets its pace once for every Kodza component, on `:root`, never by editing the CSS or the JS: `--kz-motion-scale` multiplies every duration (`0.5` twice as fast, `2` twice as slow, `0` no motion at all, loops stopped, like reduced motion). Unset, nothing changes.
- Content added later (AJAX navigation, a SPA route, a builder preview): start it with `document.dispatchEvent(new CustomEvent('kodza:init', { detail: { root: container } }))`; before removing it, the same call with `'kodza:destroy'` stops it and puts the original markup back.

### Claude artifact (claude.ai)

- Paste the CSS in a `<style>` and the JS in a `<script>` at the end, in the artifact itself: it loads stylesheets only from Google Fonts and scripts only from a few CDNs, so no `<link>` or `<script src>` to Kodza.
- Writing the artifact file with a shell? Insert the downloaded files (Files) with a command instead of retyping them: a line `KODZA-CSS` alone inside the `<style>`, `KODZA-JS` inside the `<script>`, then `sed -e '/^KODZA-CSS$/{r kodza/kodza-image-split-cards.css' -e 'd' -e '}' -e '/^KODZA-JS$/{r kodza/kodza-image-split-cards.js' -e 'd' -e '}' page.html > artifact.html`.
- Font: load Geist from Google Fonts (allowed): `<link rel="stylesheet" href="https://fonts.googleapis.com/css2?family=Geist:wght@400;500;600;700&family=Geist+Mono:wght@400;500&display=swap">`. A site with its own type sets it once for every Kodza component, on `:root`, never by editing the CSS (unset, nothing changes): `--kz-font-display`, the display face (headings, big numbers, wordmarks); `--kz-font-display-weight`, its weight; `--kz-font-display-scale`, a multiplier on its sizes (1 by default); `--kz-font-display-tracking`, its letter-spacing; `--kz-font-display-case`, its case (`uppercase`…); `--kz-font-label`, the face of the small labels (meta, captions, counters, hints, footer links, button labels); `--kz-font-label-size`, their size, one for all of them (`11px`…); `--kz-font-label-weight`, their weight; `--kz-font-label-tracking`, their letter-spacing; `--kz-font-label-case`, their case (`uppercase`…; code and units keep theirs); `--kz-font-label-leading`, their line-height (`1.45`…; buttons, pills and keys keep their box); `--kz-font-mono`, the monospace face (code, labels, counters).
- Corners: a site with its own shapes sets them once for every Kodza component, on `:root`, never by editing the CSS (unset, nothing changes): `--kz-radius-scale` multiplies every corner (`0` square, `0.5` softer, `1` Kodza).
- Motion: a site sets its pace once for every Kodza component, on `:root`, never by editing the CSS or the JS: `--kz-motion-scale` multiplies every duration (`0.5` twice as fast, `2` twice as slow, `0` no motion at all, loops stopped, like reduced motion). Unset, nothing changes.
- Images: the artifact blocks every other host, `kodza.dev` included, without an error. Embed each one as a `data:` URI, with a command if you can run one (`curl -s <url> | base64`; the 1400 px files weigh 10 to 30 KB), never by typing base64 out. If you can't run commands, keep the `<img>` with its `width` and `height`, and tell the user the picture stays blank inside the artifact.
- Dark mode: the viewer sets `data-theme="dark"` or `"light"` on `<html>`, or nothing when it follows the system. Write the Dark mode rules twice: inside `@media (prefers-color-scheme: dark)` with `:root:not([data-theme="light"])` in front of each selector, and with `:root[data-theme="dark"]` in front of each selector.

### WordPress

- HTML: a **Custom HTML** block (or a pattern / template part). WordPress keeps this markup as it is only for users allowed to post unfiltered HTML (Administrators; Super Admins on multisite): for anyone else it strips tags such as `<svg>`, `<input>` or `<dialog>`, so add it from the theme (a pattern or template part) instead.
- This one spans the page: a block theme keeps a Custom HTML block to the width of the text column, so put it inside a **Group** block set to **Full width**, with **Inner blocks use content width** turned off.
- CSS and JS: the downloaded files go in the theme, under `wp-content/themes/<your-theme>/kodza/` (the child theme if there is one), enqueued from its functions.php (or a code-snippets plugin):
  ```php
  add_action('wp_enqueue_scripts', function () {
    $dir = get_stylesheet_directory() . '/kodza/';
    $uri = get_stylesheet_directory_uri() . '/kodza/';
    wp_enqueue_style('kodza-image-split-cards', $uri . 'kodza-image-split-cards.css', [], filemtime($dir . 'kodza-image-split-cards.css'));
    wp_enqueue_script('kodza-image-split-cards', $uri . 'kodza-image-split-cards.js', [], filemtime($dir . 'kodza-image-split-cards.js'), true);
  });
  ```
  Scoped to `kodza-` classes, the CSS never touches the theme. One copy of the JS, whatever the number of blocks.
- No access to the theme files? The CSS can also go, as it is, in **Appearance → Customize → Additional CSS** (classic theme) or **Styles → Additional CSS** in the Site Editor (block theme).
- Theme with AJAX page transitions: fire `kodza:init` on the new content after each swap (and `kodza:destroy` on the old one).
- Performance plugin (WP Rocket, LiteSpeed Cache, Perfmatters…) with **Delay JavaScript execution** turned on: add `kodza` to the scripts it must not delay. Otherwise the component waits for the visitor's first scroll, tap or mouse move, and that first click can be lost.
- Colours: it takes the colour of the text around it (or keeps its own monochrome): nothing to point at the theme.
- WordPress turns straight quotes and `--` into typographic ones in the text of a Custom HTML block (not inside `<code>` or `<pre>`).

#### With Elementor

- HTML: an **HTML** widget (Elementor shows it to administrators only). It keeps the code exactly as pasted, straight quotes included.
- This one spans the page: give the widget its own container, **Content Width: Full Width**, padding 0.
- CSS and JS: as above. Elementor's Site Settings → Theme Style styles every button, field, link and image of the page, components included; the theme guard at the end of the CSS keeps the component's buttons, fields and link colours as they are.
- The Elementor editor redraws each widget after the page has loaded: without the script below, the component stays still in the editor preview (the published page works). Add it once per site, in the footer like the component's script (`kodza/elementor-editor.js`, or a code-snippets plugin):

```js
// Kodza in the Elementor editor: the editor redraws each HTML widget after the page has loaded.
// Start Kodza in what it draws, stop it in what it replaces or removes. Once per site.
window.addEventListener('elementor/frontend/init', () => {
  if (!elementorFrontend.isEditMode()) return;
  class KodzaWidget extends elementorModules.frontend.handlers.Base {
    onInit() {
      super.onInit();
      this.kodza = [...this.$element[0].children];
      document.dispatchEvent(new CustomEvent('kodza:init', { detail: { root: this.$element[0] } }));
    }
    onDestroy() {
      super.onDestroy();
      this.kodza.forEach((root) => document.dispatchEvent(new CustomEvent('kodza:destroy', { detail: { root } })));
    }
  }
  elementorFrontend.elementsHandler.attachHandler('html', KodzaWidget);
});
```

- No child theme: everything can go in the HTML widget instead, `<style>` with the CSS, the HTML, then `<script>` with the JS. It works on the page and in the editor without the script above.

### Shopify

- Files: `assets/kodza-image-split-cards.css` and `assets/kodza-image-split-cards.js` (the Files commands with `-o assets/…`).
- In the section: `{{ 'kodza-image-split-cards.css' | asset_url | stylesheet_tag }}` and `<script src="{{ 'kodza-image-split-cards.js' | asset_url }}" defer></script>`, then the HTML.
- The theme editor re-renders sections: restart them with
  `document.addEventListener('shopify:section:load', (e) => document.dispatchEvent(new CustomEvent('kodza:init', { detail: { root: e.target } })));`
  and the same with `shopify:section:unload` → `kodza:destroy`.

### React / Next.js

- Files, side by side (e.g. in `components/kodza/`): `ImageSplitCards.tsx` (below), the CSS block under Code saved as `image-split-cards.css` and the JS block as `image-split-cards.js`, both as they are. The HTML block is already inside the component: skip it.
- Use it: `import { ImageSplitCards } from '@/components/kodza/ImageSplitCards';` then `<ImageSplitCards />`. Props: `vars` (the `--kz-…` variables listed under API, e.g. `vars={{ '--kz-image-split-cards-width': … }}`), `className`, `style` and the other props of its `<div>` (`onClick`, `aria-…`).
- Next.js App Router: it is a Client Component already (`'use client'`). Pages Router: Next.js takes global CSS only in `pages/_app`, so move the `import './image-split-cards.css'` line there.
- Safe under StrictMode, client-side navigation and prop changes: when a prop changes, the `key` gives React a fresh element, `kodza:destroy` stops the script on the old one and `kodza:init` starts it on the new one.
- Built from your data (tabs, rows, options)? Add what the markup is made of to the `key`, as plain values (ids, text, numbers). What the visitor changes (the open tab, the sort, what they type) is the script's: follow it with `onClick` or `onInput` on the root, and change it from your code as a visitor would (click the tab; set the field's value, then dispatch a bubbling `input` event). Fields stay uncontrolled (`defaultValue`, `name`).

```tsx
'use client';
// Kodza — Image Split Cards, for React. From https://kodza.dev/components/image-split-cards/
// Kodza License: free to use, client work included. Not to resell or redistribute, ported or not: https://kodza.dev/docs/#print-license
// Next to this file: image-split-cards.css and image-split-cards.js, the component's CSS and JS from Kodza, as they are.
// Yours to edit: the markup is plain JSX below.
// The script changes this markup once React has rendered it (it adds layers, splits text, moves
// nodes), so React must not patch it afterwards. When a prop changes, the key gives React a fresh
// element: kodza:destroy stops the script on the old one, kodza:init starts it on the new one.
// data-kodza-manual keeps the script from starting it on its own: the effect below does, once
// React has hydrated the markup (on a page that streams in, the script can load first).
// Built from your data (tabs, rows, options)? Put what the markup is made of in the key, as plain
// values (ids, text, numbers): a change starts the script again on fresh markup. What the visitor
// changes (the open tab, the sort, what they type) is the script's: keep it out of the key, follow
// it with onClick or onInput on the root, and change it from your code as a visitor would (click
// the tab; set the field's value, then dispatch a bubbling input event).
import { useRef, useEffect, type ComponentPropsWithoutRef, type ComponentRef, type CSSProperties } from 'react';
import './image-split-cards.css';

export type ImageSplitCardsProps = Omit<ComponentPropsWithoutRef<'div'>, "children" | "vars"> & {
  /** Settings, as CSS variables on the root */
  vars?: {
    /** default: 1080px */
    "--kz-image-split-cards-width"?: string | number;
    /** default: 24px */
    "--kz-image-split-cards-gutter"?: string | number;
    /** default: 16px */
    "--kz-image-split-cards-gap"?: string | number;
    /** default: clamp(300px, 52svh, 440px) */
    "--kz-image-split-cards-height"?: string | number;
    /** default: clamp(150px, 21svh, 200px) */
    "--kz-image-split-cards-height-stacked"?: string | number;
    /** default: 150svh */
    "--kz-image-split-cards-distance"?: string | number;
    /** default: 50% 50% */
    "--kz-image-split-cards-position"?: string | number;
    /** default: calc(16px * var(--kz-radius-scale, 1)) */
    "--kz-image-split-cards-radius"?: string | number;
    /** default: var(--kz-color-ink, #0a0a0a) */
    "--kz-image-split-cards-ink"?: string | number;
    /** default: color-mix(in srgb, var(--kz-image-split-cards-ink) 62%, transparent) */
    "--kz-image-split-cards-muted"?: string | number;
    /** default: var(--kz-color-paper, #ffffff) */
    "--kz-image-split-cards-surface"?: string | number;
    /** default: color-mix(in srgb, var(--kz-image-split-cards-ink) 10%, transparent) */
    "--kz-image-split-cards-border"?: string | number;
    /** default: #0a0a0a */
    "--kz-image-split-cards-shade"?: string | number;
    /** default: var(--kz-font-mono, "Geist Mono", ui-monospace, SFMono-Regular, Menlo, monospace) */
    "--kz-image-split-cards-mono"?: string | number;
  };
  className?: string;
};

export function ImageSplitCards({ vars, className, style, ...rest }: ImageSplitCardsProps) {
  const ref = useRef<ComponentRef<'div'>>(null);
  const classes = ["kodza-image-split-cards", className].filter(Boolean).join(' ');
  // Everything the markup is made of: when it changes, React gets a fresh element (see the top)
  const key = JSON.stringify([classes, vars, style, rest]);

  // Starts the script on this element once React has rendered it, stops it when it goes
  useEffect(() => {
    const root = ref.current;
    let live = true;
    // @ts-ignore: a plain script, no types to find
    import('./image-split-cards.js').then(() => {
      if (live) document.dispatchEvent(new CustomEvent('kodza:init', { detail: { root } }));
    });
    return () => {
      live = false;
      document.dispatchEvent(new CustomEvent('kodza:destroy', { detail: { root } }));
    };
  }, [key]);

  return (
    <div data-kodza-image-split-cards="" key={key} {...rest} className={classes} data-kodza-manual style={{ ...vars, ...style } as CSSProperties} ref={ref}>
      <div className="kodza-image-split-cards__stage">
        <div className="kodza-image-split-cards__head">
          <p className="kodza-image-split-cards__label">Why teams switch</p>
          <h2 className="kodza-image-split-cards__heading">Three reasons to stop babysitting your deploys.</h2>
        </div>
        <div className="kodza-image-split-cards__deck">
          <img className="kodza-image-split-cards__image" src="https://kodza.dev/media/kz-repeat-1400.webp" srcSet="https://kodza.dev/media/kz-repeat-1400.webp 1400w, https://kodza.dev/media/kz-repeat-2400.webp 2400w" sizes="(max-width: 640px) 100vw, 1080px" alt="A concrete wall cut into a grid of deep square windows" width="1400" height="933" loading="lazy" />
          <ol className="kodza-image-split-cards__list">
            <li className="kodza-image-split-cards__card">
              <span className="kodza-image-split-cards__index" aria-hidden="true">01</span>
              <h3 className="kodza-image-split-cards__title">One command</h3>
              <p className="kodza-image-split-cards__text"><code>quay ship</code> builds, tests and deploys. No YAML copied from a 2019 blog post.</p>
            </li>
            <li className="kodza-image-split-cards__card">
              <span className="kodza-image-split-cards__index" aria-hidden="true">02</span>
              <h3 className="kodza-image-split-cards__title">Rollbacks that roll back</h3>
              <p className="kodza-image-split-cards__text">Every release keeps its build. Going back takes four seconds, not a hotfix at midnight.</p>
            </li>
            <li className="kodza-image-split-cards__card">
              <span className="kodza-image-split-cards__index" aria-hidden="true">03</span>
              <h3 className="kodza-image-split-cards__title">Logs a human can read</h3>
              <p className="kodza-image-split-cards__text">The line that broke is the first one you see. Not line 4,812 of a stack trace.</p>
            </li>
          </ol>
        </div>
      </div>
    </div>
  );
}
```

## Code

```html
<div class="kodza-image-split-cards" data-kodza-image-split-cards>
  <div class="kodza-image-split-cards__stage">
    <div class="kodza-image-split-cards__head">
      <p class="kodza-image-split-cards__label">Why teams switch</p>
      <h2 class="kodza-image-split-cards__heading">Three reasons to stop babysitting your deploys.</h2>
    </div>
    <div class="kodza-image-split-cards__deck">
      <img class="kodza-image-split-cards__image" src="https://kodza.dev/media/kz-repeat-1400.webp" srcset="https://kodza.dev/media/kz-repeat-1400.webp 1400w, https://kodza.dev/media/kz-repeat-2400.webp 2400w" sizes="(max-width: 640px) 100vw, 1080px" alt="A concrete wall cut into a grid of deep square windows" width="1400" height="933" loading="lazy">
      <ol class="kodza-image-split-cards__list">
        <li class="kodza-image-split-cards__card">
          <span class="kodza-image-split-cards__index" aria-hidden="true">01</span>
          <h3 class="kodza-image-split-cards__title">One command</h3>
          <p class="kodza-image-split-cards__text"><code>quay ship</code> builds, tests and deploys. No YAML copied from a 2019 blog post.</p>
        </li>
        <li class="kodza-image-split-cards__card">
          <span class="kodza-image-split-cards__index" aria-hidden="true">02</span>
          <h3 class="kodza-image-split-cards__title">Rollbacks that roll back</h3>
          <p class="kodza-image-split-cards__text">Every release keeps its build. Going back takes four seconds, not a hotfix at midnight.</p>
        </li>
        <li class="kodza-image-split-cards__card">
          <span class="kodza-image-split-cards__index" aria-hidden="true">03</span>
          <h3 class="kodza-image-split-cards__title">Logs a human can read</h3>
          <p class="kodza-image-split-cards__text">The line that broke is the first one you see. Not line 4,812 of a stack trace.</p>
        </li>
      </ol>
    </div>
  </div>
</div>
```

```css
/* Kodza License: free to use, client work included. Not to resell or redistribute, ported or not: https://kodza.dev/docs/#print-license */
/* Kodza — Image Split Cards
   One picture laid over a row of cards. As the scroll runs through the section, pinned in the
   middle of the screen, the picture splits along the gaps and its inner corners round off, then
   each piece turns over to show its card, one after the other. The text is real HTML from the
   start. Without the script, or with reduced motion, the picture sits above the cards.
   Tuned with the --kz-image-split-cards-* variables; the pacing of the turns is in the constants
   at the top of component.js. */
.kodza-image-split-cards {
  /* The column the head and the cards share, and the room kept on each side of a narrow screen */
  --kz-image-split-cards-width: 1080px;
  --kz-image-split-cards-gutter: 24px;
  /* The gap the pieces open between them */
  --kz-image-split-cards-gap: 16px;
  /* A card's height side by side, then stacked (a narrow section, under 640px) */
  --kz-image-split-cards-height: clamp(300px, 52svh, 440px);
  --kz-image-split-cards-height-stacked: clamp(150px, 21svh, 200px);
  /* How much scroll the section holds the screen for, on top of its own height */
  --kz-image-split-cards-distance: 150svh;
  /* Which part of the picture the cut keeps */
  --kz-image-split-cards-position: 50% 50%;
  --kz-image-split-cards-radius: calc(16px * var(--kz-radius-scale, 1));
  --kz-image-split-cards-ink: var(--kz-color-ink, #0a0a0a);
  --kz-image-split-cards-muted: color-mix(in srgb, var(--kz-image-split-cards-ink) 62%, transparent);
  --kz-image-split-cards-surface: var(--kz-color-paper, #ffffff);
  --kz-image-split-cards-border: color-mix(in srgb, var(--kz-image-split-cards-ink) 10%, transparent);
  /* The shadow a card takes as it turns edge-on */
  --kz-image-split-cards-shade: #0a0a0a;
  --kz-image-split-cards-mono: var(--kz-font-mono, "Geist Mono", ui-monospace, SFMono-Regular, Menlo, monospace);

  position: relative;
  display: block;
  container-type: inline-size;
  color: var(--kz-image-split-cards-ink);
}

/* The head and the cards. Once the script runs, it holds the screen while the section scrolls by */
.kodza-image-split-cards__stage {
  box-sizing: border-box;
  display: grid;
  gap: clamp(32px, 6svh, 56px);
  width: min(var(--kz-image-split-cards-width), 100% - 2 * var(--kz-image-split-cards-gutter));
  /* Centred like margin: auto, but worked out: Chrome can report a stale 0 for auto right after
     kodza:init, and the theme bench reads it as a theme taking the margin */
  margin-inline: max(var(--kz-image-split-cards-gutter), (100% - var(--kz-image-split-cards-width)) / 2);
}

.kodza-image-split-cards__head {
  display: grid;
  gap: 14px;
}

.kodza-image-split-cards__label {
  margin: 0;
  color: var(--kz-image-split-cards-muted);
  font-family: var(--kz-font-label, var(--kz-image-split-cards-mono));
  font-size: var(--kz-font-label-size, 12.5px);
  font-weight: var(--kz-font-label-weight, 500);
  line-height: var(--kz-font-label-leading, 1.4);
  letter-spacing: var(--kz-font-label-tracking, 0.02em);
  text-transform: var(--kz-font-label-case, inherit);
}

.kodza-image-split-cards__heading {
  max-width: 16em;
  margin: 0;
  color: inherit;
  font-family: var(--kz-font-display, inherit);
  font-size: calc(clamp(28px, 4.2cqi, 48px) * var(--kz-font-display-scale, 1));
  font-weight: var(--kz-font-display-weight, 600);
  line-height: 1.04;
  letter-spacing: var(--kz-font-display-tracking, -0.045em);
  text-transform: var(--kz-font-display-case, inherit);
  text-wrap: balance;
}

.kodza-image-split-cards__deck {
  display: grid;
  gap: var(--kz-image-split-cards-gap);
}

/* At rest (no script, reduced motion): the picture above the cards */
.kodza-image-split-cards__image {
  display: block;
  width: 100%;
  max-width: none;
  height: clamp(200px, 30cqi, 360px);
  margin: 0;
  border-radius: var(--kz-image-split-cards-radius);
  object-fit: cover;
  object-position: var(--kz-image-split-cards-position);
}

.kodza-image-split-cards__list {
  display: grid;
  grid-auto-columns: minmax(0, 1fr);
  grid-auto-flow: column;
  gap: var(--kz-image-split-cards-gap);
  margin: 0;
  padding: 0;
  list-style: none;
}

/* A card: the list item itself until the script runs, then its back face */
.kodza-image-split-cards:not(.is-ready) .kodza-image-split-cards__card,
.kodza-image-split-cards__back {
  box-sizing: border-box;
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 10px;
  min-height: 220px;
  margin: 0;
  padding: 28px;
  border: 1px solid var(--kz-image-split-cards-border);
  border-radius: var(--kz-image-split-cards-radius);
  background: var(--kz-image-split-cards-surface);
}

.kodza-image-split-cards__card {
  position: relative;
  display: grid;
  margin: 0;
  padding: 0;
}

.kodza-image-split-cards__index {
  color: var(--kz-image-split-cards-muted);
  font-family: var(--kz-font-label, var(--kz-image-split-cards-mono));
  font-size: var(--kz-font-label-size, 12.5px);
  font-weight: var(--kz-font-label-weight, 500);
  line-height: var(--kz-font-label-leading, 1.4);
  letter-spacing: var(--kz-font-label-tracking, 0.02em);
  text-transform: var(--kz-font-label-case, inherit);
}

/* The title and the text sit at the bottom of the card, the number at the top */
.kodza-image-split-cards__title {
  margin: auto 0 0;
  padding-top: 24px;
  color: inherit;
  font-family: inherit;
  font-size: 22px;
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.02em;
  text-wrap: balance;
}

.kodza-image-split-cards__text {
  max-width: 30em;
  margin: 0;
  color: var(--kz-image-split-cards-muted);
  font-size: 15px;
  line-height: 1.55;
  text-wrap: pretty;
}

.kodza-image-split-cards__text code {
  color: var(--kz-image-split-cards-ink);
  font-family: var(--kz-font-mono, var(--kz-image-split-cards-mono));
  font-size: 0.92em;
}

/* Running: the section is a track, the stage sticks while the scroll runs through it */
.kodza-image-split-cards.is-live::after {
  content: "";
  display: block;
  height: var(--kz-image-split-cards-distance);
}

.kodza-image-split-cards.is-live .kodza-image-split-cards__stage {
  position: sticky;
  top: 0;
  align-content: center;
  min-height: 100svh;
  padding-block: clamp(24px, 6svh, 64px);
}

.kodza-image-split-cards.is-live .kodza-image-split-cards__list {
  grid-auto-rows: var(--kz-image-split-cards-height);
}

/* Each card turns in 3D: two faces in one cell, each hiding its back */
.kodza-image-split-cards.is-live .kodza-image-split-cards__card {
  transform-style: preserve-3d;
  will-change: transform;
}

.kodza-image-split-cards__front,
.kodza-image-split-cards.is-live .kodza-image-split-cards__back {
  grid-area: 1 / 1;
  min-height: 0;
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
}

/* The front: the picture, offset so each card shows its own slice. The inner corners stay square
   while the pieces touch, and round off as they part (--kz-image-split-cards-split, 0 to 1) */
.kodza-image-split-cards__front {
  --kz-image-split-cards-inner: calc(var(--kz-image-split-cards-radius) * var(--kz-image-split-cards-split, 1));
  position: relative;
  overflow: hidden;
  border-radius: var(--kz-image-split-cards-inner);
  background: var(--kz-image-split-cards-border);
}

.kodza-image-split-cards__card:first-child .kodza-image-split-cards__front {
  border-radius: var(--kz-image-split-cards-radius) var(--kz-image-split-cards-inner) var(--kz-image-split-cards-inner) var(--kz-image-split-cards-radius);
}

.kodza-image-split-cards__card:last-child .kodza-image-split-cards__front {
  border-radius: var(--kz-image-split-cards-inner) var(--kz-image-split-cards-radius) var(--kz-image-split-cards-radius) var(--kz-image-split-cards-inner);
}

.kodza-image-split-cards__front .kodza-image-split-cards__image {
  position: absolute;
  top: 0;
  left: calc(var(--kz-image-split-cards-i, 0) * -100%);
  width: calc(var(--kz-image-split-cards-n, 3) * 100%);
  height: 100%;
  border-radius: 0;
}

/* The back starts turned away, the way the card turns */
.kodza-image-split-cards.is-live .kodza-image-split-cards__back {
  transform: rotateY(180deg);
}

/* The text arrives once its side faces you (--kz-image-split-cards-reveal, 0 to 1) */
.kodza-image-split-cards.is-live .kodza-image-split-cards__back > * {
  opacity: var(--kz-image-split-cards-reveal, 1);
  transform: translateY(calc((1 - var(--kz-image-split-cards-reveal, 1)) * 14px));
}

/* Edge-on, a card falls into shadow (--kz-image-split-cards-turn, 0 to about 0.3) */
.kodza-image-split-cards__front::after,
.kodza-image-split-cards.is-live .kodza-image-split-cards__back::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: var(--kz-image-split-cards-shade);
  opacity: var(--kz-image-split-cards-turn, 0);
  pointer-events: none;
}

/* Stacked, in a narrow section: the picture is cut across, and the cards turn top over bottom */
@container (max-width: 639.98px) {
  .kodza-image-split-cards__list {
    grid-auto-columns: auto;
    grid-auto-flow: row;
  }

  .kodza-image-split-cards__back {
    min-height: 0;
    padding: 22px;
  }

  .kodza-image-split-cards__title {
    padding-top: 14px;
    font-size: 20px;
  }

  .kodza-image-split-cards.is-live .kodza-image-split-cards__list {
    grid-auto-rows: minmax(var(--kz-image-split-cards-height-stacked), 1fr);
  }
}

.kodza-image-split-cards.is-stacked .kodza-image-split-cards__card:first-child .kodza-image-split-cards__front {
  border-radius: var(--kz-image-split-cards-radius) var(--kz-image-split-cards-radius) var(--kz-image-split-cards-inner) var(--kz-image-split-cards-inner);
}

.kodza-image-split-cards.is-stacked .kodza-image-split-cards__card:last-child .kodza-image-split-cards__front {
  border-radius: var(--kz-image-split-cards-inner) var(--kz-image-split-cards-inner) var(--kz-image-split-cards-radius) var(--kz-image-split-cards-radius);
}

.kodza-image-split-cards.is-stacked .kodza-image-split-cards__front .kodza-image-split-cards__image {
  top: calc(var(--kz-image-split-cards-i, 0) * -100%);
  left: 0;
  width: 100%;
  height: calc(var(--kz-image-split-cards-n, 3) * 100%);
}

.kodza-image-split-cards.is-live.is-stacked .kodza-image-split-cards__back {
  transform: rotateX(180deg);
}

/* kodza-guard 6aba800268dc — generated by Kodza, do not edit.
   Theme guard: keeps a site's own CSS (WordPress themes, Bootstrap, CSS resets…) off this
   component. :not(#_) is always true and weighs as much as an id, so these lines win over
   theme rules made of classes and tags. Customise the component through its --kz-* variables. */

/* What the browser gives, where the component sets it only in some states: at the lowest weight, so its own rules below put it back */

:where(.kodza-image-split-cards__card):not(#_) {
  border: revert;
  border-radius: revert;
  box-sizing: revert;
  background-color: revert;
  background-image: revert;
}

/* What the browser gives, on everything the component leaves to it */

.kodza-image-split-cards:not(#_),
.kodza-image-split-cards__head:not(#_),
.kodza-image-split-cards__deck:not(#_),
.kodza-image-split-cards__front:not(#_),
.kodza-image-split-cards__index:not(#_) {
  box-sizing: revert;
}

.kodza-image-split-cards__label:not(#_) {
  border: revert;
  padding: revert;
  border-radius: revert;
  outline: revert;
  text-decoration: revert;
  transition: revert;
  list-style: revert;
  box-sizing: revert;
  float: revert;
  position: revert;
  background-color: revert;
  background-image: revert;
  box-shadow: revert;
  outline-offset: revert;
  appearance: revert;
  max-width: revert;
  max-height: revert;
  font-style: revert;
  text-underline-offset: revert;
  text-align: revert;
  text-indent: revert;
  text-shadow: revert;
  vertical-align: revert;
}

.kodza-image-split-cards__heading:not(#_) {
  border: revert;
  padding: revert;
  border-radius: revert;
  outline: revert;
  text-decoration: revert;
  transition: revert;
  list-style: revert;
  box-sizing: revert;
  float: revert;
  position: revert;
  background-color: revert;
  background-image: revert;
  box-shadow: revert;
  outline-offset: revert;
  appearance: revert;
  max-height: revert;
  font-style: revert;
  text-underline-offset: revert;
  text-align: revert;
  text-indent: revert;
  text-shadow: revert;
  vertical-align: revert;
}

.kodza-image-split-cards__list:not(#_) {
  border: revert;
  border-radius: revert;
  outline: revert;
  text-decoration: revert;
  transition: revert;
  box-sizing: revert;
  float: revert;
  position: revert;
  background-color: revert;
  background-image: revert;
  box-shadow: revert;
  outline-offset: revert;
  appearance: revert;
  max-width: revert;
  max-height: revert;
  color: revert;
  font-family: revert;
  font-size: revert;
  font-weight: revert;
  font-style: revert;
  line-height: revert;
  letter-spacing: revert;
  text-transform: revert;
  text-underline-offset: revert;
  text-align: revert;
  text-indent: revert;
  text-shadow: revert;
  vertical-align: revert;
}

.kodza-image-split-cards__card:not(#_) {
  outline: revert;
  text-decoration: revert;
  transition: revert;
  list-style: revert;
  float: revert;
  box-shadow: revert;
  outline-offset: revert;
  appearance: revert;
  max-width: revert;
  max-height: revert;
  color: revert;
  font-family: revert;
  font-size: revert;
  font-weight: revert;
  font-style: revert;
  line-height: revert;
  letter-spacing: revert;
  text-transform: revert;
  text-underline-offset: revert;
  text-align: revert;
  text-indent: revert;
  text-shadow: revert;
  vertical-align: revert;
}

.kodza-image-split-cards__image:not(#_) {
  border: revert;
  padding: revert;
  outline: revert;
  text-decoration: revert;
  transition: revert;
  list-style: revert;
  box-sizing: revert;
  float: revert;
  background-color: revert;
  background-image: revert;
  box-shadow: revert;
  outline-offset: revert;
  appearance: revert;
  max-height: revert;
  color: revert;
  font-family: revert;
  font-size: revert;
  font-weight: revert;
  font-style: revert;
  line-height: revert;
  letter-spacing: revert;
  text-transform: revert;
  text-underline-offset: revert;
  text-align: revert;
  text-indent: revert;
  text-shadow: revert;
  vertical-align: revert;
}

.kodza-image-split-cards__title:not(#_) {
  border: revert;
  border-radius: revert;
  outline: revert;
  text-decoration: revert;
  transition: revert;
  list-style: revert;
  box-sizing: revert;
  float: revert;
  position: revert;
  padding-right: revert;
  padding-bottom: revert;
  padding-left: revert;
  background-color: revert;
  background-image: revert;
  box-shadow: revert;
  outline-offset: revert;
  appearance: revert;
  max-width: revert;
  max-height: revert;
  font-style: revert;
  text-transform: revert;
  text-underline-offset: revert;
  text-align: revert;
  text-indent: revert;
  text-shadow: revert;
  vertical-align: revert;
}

.kodza-image-split-cards__text:not(#_) {
  border: revert;
  padding: revert;
  border-radius: revert;
  outline: revert;
  text-decoration: revert;
  transition: revert;
  list-style: revert;
  box-sizing: revert;
  float: revert;
  position: revert;
  background-color: revert;
  background-image: revert;
  box-shadow: revert;
  outline-offset: revert;
  appearance: revert;
  max-height: revert;
  font-family: revert;
  font-weight: revert;
  font-style: revert;
  letter-spacing: revert;
  text-transform: revert;
  text-underline-offset: revert;
  text-align: revert;
  text-indent: revert;
  text-shadow: revert;
  vertical-align: revert;
}

.kodza-image-split-cards__text code:where(:not([class*="kodza-"])):not(#_) {
  border: revert;
  margin: revert;
  padding: revert;
  border-radius: revert;
  outline: revert;
  text-decoration: revert;
  transition: revert;
  list-style: revert;
  box-sizing: revert;
  float: revert;
  position: revert;
  background-color: revert;
  background-image: revert;
  box-shadow: revert;
  outline-offset: revert;
  appearance: revert;
  max-width: revert;
  max-height: revert;
  font-weight: revert;
  font-style: revert;
  line-height: revert;
  letter-spacing: revert;
  text-transform: revert;
  text-underline-offset: revert;
  text-align: revert;
  text-indent: revert;
  text-shadow: revert;
  vertical-align: revert;
}

.kodza-image-split-cards__label:not(#_):where(:not([hidden])),
.kodza-image-split-cards__heading:not(#_):where(:not([hidden])),
.kodza-image-split-cards__title:not(#_):where(:not([hidden])),
.kodza-image-split-cards__text:not(#_):where(:not([hidden])),
.kodza-image-split-cards__text code:where(:not([class*="kodza-"])):not(#_):where(:not([hidden])) {
  display: revert;
}

.kodza-image-split-cards__label:not(#_):where([hidden]),
.kodza-image-split-cards__heading:not(#_):where([hidden]),
.kodza-image-split-cards__title:not(#_):where([hidden]),
.kodza-image-split-cards__text:not(#_):where([hidden]),
.kodza-image-split-cards__text code:where(:not([class*="kodza-"])):not(#_):where([hidden]) {
  display: none;
}

.kodza-image-split-cards:not(#_)::after,
.kodza-image-split-cards__front:not(#_)::after,
.kodza-image-split-cards__back:not(#_)::after {
  box-sizing: revert;
}

/* The component's own rules, one step stronger: real buttons and fields, what it sets on tags themes style (links, lists, headings, images…), and the root width (a theme may narrow it, never widen it) */

.kodza-image-split-cards__label:not(#_) {
  margin: 0;
  color: var(--kz-image-split-cards-muted);
  font-family: var(--kz-font-label, var(--kz-image-split-cards-mono));
  font-size: var(--kz-font-label-size, 12.5px);
  font-weight: var(--kz-font-label-weight, 500);
  line-height: var(--kz-font-label-leading, 1.4);
  letter-spacing: var(--kz-font-label-tracking, 0.02em);
  text-transform: var(--kz-font-label-case, inherit);
}

.kodza-image-split-cards__heading:not(#_) {
  max-width: 16em;
  margin: 0;
  color: inherit;
  font-family: var(--kz-font-display, inherit);
  font-size: calc(clamp(28px, 4.2cqi, 48px) * var(--kz-font-display-scale, 1));
  font-weight: var(--kz-font-display-weight, 600);
  line-height: 1.04;
  letter-spacing: var(--kz-font-display-tracking, -0.045em);
  text-transform: var(--kz-font-display-case, inherit);
}

.kodza-image-split-cards__image:not(#_) {
  display: block;
  max-width: none;
  margin: 0;
  border-radius: var(--kz-image-split-cards-radius);
}

.kodza-image-split-cards__list:not(#_) {
  display: grid;
  margin: 0;
  padding: 0;
  list-style: none;
}

.kodza-image-split-cards:not(.is-ready) .kodza-image-split-cards__card:not(#_) {
  box-sizing: border-box;
  position: relative;
  display: flex;
  margin: 0;
  padding: 28px;
  border: 1px solid var(--kz-image-split-cards-border);
  border-radius: var(--kz-image-split-cards-radius);
  background: var(--kz-image-split-cards-surface);
}

.kodza-image-split-cards__card:not(#_) {
  position: relative;
  display: grid;
  margin: 0;
  padding: 0;
}

.kodza-image-split-cards__title:not(#_) {
  margin: auto 0 0;
  padding-top: 24px;
  color: inherit;
  font-family: inherit;
  font-size: 22px;
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.kodza-image-split-cards__text:not(#_) {
  max-width: 30em;
  margin: 0;
  color: var(--kz-image-split-cards-muted);
  font-size: 15px;
  line-height: 1.55;
}

.kodza-image-split-cards__text code:not(#_) {
  color: var(--kz-image-split-cards-ink);
  font-family: var(--kz-font-mono, var(--kz-image-split-cards-mono));
  font-size: 0.92em;
}

.kodza-image-split-cards__front .kodza-image-split-cards__image:not(#_) {
  position: absolute;
  border-radius: 0;
}

@container (max-width: 639.98px) {
  .kodza-image-split-cards__title:not(#_) {
    padding-top: 14px;
    font-size: 20px;
  }
}
```

```js
// Kodza License: free to use, client work included. Not to resell or redistribute, ported or not: https://kodza.dev/docs/#print-license
// Kodza — Image Split Cards
// The section becomes a track: its stage sticks in the middle of the screen while the scroll runs
// through it, and the script writes two things from that scroll. First how far the pieces have
// parted (the picture splits along the gaps, the inner corners round off), then each card's turn,
// one after the other, with a little lift and shade, its text arriving once it faces you. The
// pacing is in the constants below. Reduced motion, or a site pace of 0: the picture sits above
// the cards, which show their text, and nothing turns.
(() => {
  const SELECTOR = '[data-kodza-image-split-cards]';
  // The track starts once the section's top is this far down the screen (a share of its height):
  // the pieces start parting as the stage settles, not after
  const LEAD = 0.2;
  // Share of the track the pieces take to part
  const SPLIT = 0.22;
  // When the first card starts turning, and when the last one lies flat: the rest of the track is
  // a short hold, to read the last card before the section moves on
  const TURN_FROM = 0.18;
  const TURN_TO = 0.92;
  // Share of the track one turn takes. Longer than the step between two cards, so they overlap
  const TURN = 0.34;
  // The depth of the turn (CSS perspective, px), how much a card grows halfway through it, and how
  // dark it gets edge-on
  const PERSPECTIVE = 1200;
  const LIFT = 0.04;
  const SHADE = 0.32;
  // At rest the pieces overlap by this much (px): edges that meet on a fraction of a pixel would let
  // a hairline of the page show between them
  const SEAM = 1;
  // How long the cards take to catch up with the scroll, in ms (times the site's pace): a soft
  // follow instead of cards glued to the wheel. 0 glues them
  const SMOOTHING = 120;
  // The progress left to travel below this ends the loop
  const SETTLE = 0.0005;

  const reduceMotion = window.matchMedia('(prefers-reduced-motion: reduce)').matches;
  // The site's pace, --kz-motion-scale (set on :root, read on the instance): every duration of the
  // script times it, and 0 moves nothing, like reduced motion
  const paceOf = (el) => {
    const pace = parseFloat(getComputedStyle(el).getPropertyValue('--kz-motion-scale'));
    return pace >= 0 ? pace : 1;
  };
  const clamp = (value, min, max) => Math.min(max, Math.max(min, value));
  // Slow off the mark, slow into place
  const ease = (t) => (t < 0.5 ? 4 * t * t * t : 1 - (-2 * t + 2) ** 3 / 2);

  // One instance, with its own state: two copies on a page never interfere. Everything it
  // starts is tied to `signal` (listeners get { signal }, observers and timers stop on its
  // 'abort' event), so kodza:destroy stops it all.
  function mount(root, signal) {
    const stage = root.querySelector('.kodza-image-split-cards__stage');
    const image = root.querySelector('.kodza-image-split-cards__image');
    const cards = [...root.querySelectorAll('.kodza-image-split-cards__card')];
    if (!stage || !cards.length) return;
    // Each card's content goes into its back face, the side that turns up
    cards.forEach((card) => {
      const back = document.createElement('div');
      back.className = 'kodza-image-split-cards__back';
      back.append(...card.childNodes);
      card.append(back);
    });

    const pace = paceOf(root);
    const still = reduceMotion || !pace; // the still path: no motion asked, by the visitor or the site
    if (still || !image || cards.length < 2) return;
    const smoothing = SMOOTHING * pace;
    const count = cards.length;
    const step = (TURN_TO - TURN_FROM - TURN) / (count - 1);

    // Each card gets a front face with the picture, offset to show its own slice: the first one
    // takes the image as written (and its alt), the others a silent copy
    root.style.setProperty('--kz-image-split-cards-n', count);
    cards.forEach((card, index) => {
      const front = document.createElement('div');
      front.className = 'kodza-image-split-cards__front';
      const slice = index ? image.cloneNode() : image;
      if (index) {
        slice.alt = '';
        slice.setAttribute('aria-hidden', 'true');
      }
      front.append(slice);
      card.style.setProperty('--kz-image-split-cards-i', index);
      card.prepend(front);
    });
    root.classList.add('is-live');

    let stacked = false;
    let gap = 0;
    let top = 0; // where the stage sticks: 0, or above the screen when it is taller than it
    let current = null; // the progress written now
    let raf = 0;
    let last = 0;
    let shown = false;

    // Side by side or stacked, and the gap to close at rest. Read in layout pixels, which the
    // cards' own transforms (and a scaled parent) leave alone
    const measure = () => {
      const [first, second] = cards;
      stacked = second.offsetTop > first.offsetTop + first.offsetHeight / 2;
      root.classList.toggle('is-stacked', stacked);
      gap = stacked
        ? second.offsetTop - first.offsetTop - first.offsetHeight
        : second.offsetLeft - first.offsetLeft - first.offsetWidth;
      // A stage taller than the screen sticks by its bottom edge, so all of it shows
      stage.style.top = '';
      top = Math.min(0, innerHeight - stage.getBoundingClientRect().height);
      stage.style.top = `${top}px`;
    };
    // The track: 0 once the section's top is LEAD down the screen, 1 as the stage lets go. A section
    // that already sits higher than that on load (it opens the page) starts whole, at the top
    const lead = () => Math.min(innerHeight * LEAD, Math.max(0, root.getBoundingClientRect().top + scrollY));
    const span = () => root.getBoundingClientRect().height - stage.getBoundingClientRect().height + lead() - top;
    const goal = () => clamp((lead() - root.getBoundingClientRect().top) / span(), 0, 1);
    const write = () => {
      const split = ease(clamp(current / SPLIT, 0, 1));
      root.style.setProperty('--kz-image-split-cards-split', split.toFixed(4));
      cards.forEach((card, index) => {
        // At rest the pieces close the gaps around the middle one, so the picture reads whole
        const shift = (gap + SEAM) * ((count - 1) / 2 - index) * (1 - split);
        const turn = ease(clamp((current - TURN_FROM - index * step) / TURN, 0, 1));
        const angle = 180 * turn;
        const arc = Math.sin(turn * Math.PI);
        const move = stacked ? `translate3d(0, ${shift.toFixed(2)}px, 0)` : `translate3d(${shift.toFixed(2)}px, 0, 0)`;
        const rotate = stacked ? `rotateX(${(-angle).toFixed(2)}deg)` : `rotateY(${angle.toFixed(2)}deg)`;
        card.style.transform = `${move} perspective(${PERSPECTIVE}px) ${rotate} scale(${(1 + LIFT * arc).toFixed(4)})`;
        card.style.setProperty('--kz-image-split-cards-turn', (SHADE * arc).toFixed(3));
        card.style.setProperty('--kz-image-split-cards-reveal', clamp((angle - 100) / 70, 0, 1).toFixed(3));
      });
    };
    const tick = (now) => {
      raf = 0;
      const to = goal();
      const frame = last ? Math.min(now - last, 64) : 16.7;
      last = now;
      if (current === null || !smoothing) current = to;
      else current += (to - current) * (1 - Math.exp(-frame / smoothing));
      if (Math.abs(to - current) < SETTLE) current = to;
      write();
      if (current !== to) raf = requestAnimationFrame(tick);
      else last = 0;
    };
    const queue = () => {
      if (!shown || raf) return;
      raf = requestAnimationFrame(tick);
    };
    const place = () => {
      current = goal();
      write();
    };

    // Placed before it first shows, so nothing turns in front of you on load
    measure();
    place();

    // Focus landing in a card that has not turned yet (a link in its text, from the keyboard):
    // the page scrolls to where that card faces you
    root.addEventListener('focusin', (event) => {
      const index = cards.findIndex((card) => card.contains(event.target));
      const end = TURN_FROM + index * step + TURN;
      if (index < 0 || current >= end) return;
      window.scrollTo({ top: scrollY + root.getBoundingClientRect().top - lead() + end * span(), behavior: 'instant' });
      place();
    }, { signal });

    const io = new IntersectionObserver(([entry]) => {
      shown = entry.isIntersecting;
      if (shown) place(); // back on screen after a jump (an anchor, Home): placed, not chased
    });
    io.observe(root);
    const resize = new ResizeObserver(() => {
      measure();
      queue();
    });
    resize.observe(stage);
    window.addEventListener('scroll', queue, { passive: true, signal });
    window.addEventListener('resize', () => {
      measure();
      queue();
    }, { signal });
    signal.addEventListener('abort', () => {
      io.disconnect();
      resize.disconnect();
      cancelAnimationFrame(raf);
    });
  }

  // Kodza lifecycle, the same in every component: `kodza:init` starts the instances inside
  // event.detail.root (the whole page by default), `kodza:destroy` stops them and puts their
  // markup back. For themes and apps that swap content without a page load. Each running root
  // keeps its markup as written under KODZA, shared by every Kodza script on the page: a Kodza
  // component inside another one is saved as written, not half-started, and stopped with it. Two
  // components on one root (a reveal on a stat card) both start, and stop together.
  const KODZA = Symbol.for('kodza');
  const RUNNING = Symbol.for(`kodza ${SELECTOR}`); // a root this component runs on, for every copy of this script
  const instances = new WeakMap();
  const find = (scope = document) => [scope, ...scope.querySelectorAll(SELECTOR)].filter((el) => el.matches?.(SELECTOR));
  const attrsOf = (el) => [...el.attributes].map((a) => [a.name, a.value]);
  const put = (el, saved) => {
    [...el.attributes].forEach((a) => el.removeAttribute(a.name));
    saved.attrs.forEach(([name, value]) => el.setAttribute(name, value));
    el.innerHTML = saved.html;
  };
  // The markup inside a root as written: Kodza components already running in it give back their own
  const written = (root) => {
    const all = [...root.querySelectorAll('*')];
    if (!all.some((el) => el[KODZA])) return root.innerHTML;
    const copy = root.cloneNode(true);
    const twins = copy.querySelectorAll('*');
    let last = null;
    all.forEach((el, i) => {
      if (!el[KODZA] || last?.contains(el)) return;
      last = el;
      put(twins[i], el[KODZA]);
    });
    return copy.innerHTML;
  };
  const init = (scope) => find(scope).forEach((root) => {
    // Already running, maybe from another copy of this script. Marked is-ready with no Kodza component
    // running on it, a root is a copy of a started one (a cloned slide): it is left as it is
    if (root[RUNNING] || (root.classList.contains('is-ready') && !root[KODZA])) return;
    // Rendered by React (data-kodza-manual): React starts it, with an init aimed at that markup once
    // it has hydrated it. Any earlier start would change markup React has not taken over yet
    const owner = root.closest('[data-kodza-manual]');
    if (owner && !(scope && owner.contains(scope))) return;
    const controller = new AbortController();
    // Another Kodza component already running on this root: its markup as written is kept, and the
    // two stop together
    const before = root[KODZA];
    const saved = { html: before ? before.html : written(root), attrs: before ? before.attrs : attrsOf(root), stop: () => destroy(root) };
    if (before) before.above = saved;
    instances.set(root, { controller, saved, before });
    root[KODZA] = saved;
    root[RUNNING] = true;
    mount(root, controller.signal);
    root.classList.add('is-ready');
  });
  const destroy = (scope) => find(scope).forEach((root) => {
    const instance = instances.get(root);
    if (!instance) return;
    instances.delete(root);
    instance.saved.above?.stop(); // a Kodza component started after it on the same root stops first
    // The Kodza components running inside it stop first: once its markup is put back, their own
    // script could not find them any more
    root.querySelectorAll('*').forEach((el) => el[KODZA]?.stop());
    instance.controller.abort();
    delete root[RUNNING];
    // Started on top of another one: that one stops next, and puts the markup back
    if (instance.before) {
      delete instance.before.above;
      root[KODZA] = instance.before;
      return instance.before.stop();
    }
    delete root[KODZA];
    put(root, instance.saved);
  });
  document.addEventListener('kodza:init', (event) => init(event.detail?.root));
  document.addEventListener('kodza:destroy', (event) => destroy(event.detail?.root));
  init();
  // Loaded in <head>, the script runs before the markup exists: once more when it is parsed
  if (document.readyState === 'loading') document.addEventListener('DOMContentLoaded', () => init(), { once: true });
})();
```

Free to use, from Kodza (https://kodza.dev).