# Subscribe Field

> An email field and its button in one pill: the address is checked in place, the button rolls to a turning ring, then the thanks rises where the pill was. Posts to the form action or to your code.

Forms · newsletter, subscribe, email, signup, form, input, loading · HTML, CSS, vanilla JS · no dependencies · updated 2026-11-04
Demo: https://kodza.dev/components/subscribe-field/
Source on GitHub: https://github.com/kodza-dev/kodza/tree/main/components/subscribe-field

## Files

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

- [`kodza-subscribe-field.css`](https://kodza.dev/registry/subscribe-field/kodza-subscribe-field.css) · 21.9 KB
- [`kodza-subscribe-field.js`](https://kodza.dev/registry/subscribe-field/kodza-subscribe-field.js) · 11.1 KB
- [`kodza-subscribe-field.html`](https://kodza.dev/registry/subscribe-field/kodza-subscribe-field.html) · 2.8 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-subscribe-field.css https://kodza.dev/registry/subscribe-field/kodza-subscribe-field.css
curl -fsSL --create-dirs -o kodza/kodza-subscribe-field.js https://kodza.dev/registry/subscribe-field/kodza-subscribe-field.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`.)

## API

- Root: `.kodza-subscribe`
- Variables (set them on the root element itself: it declares its own defaults):
  - `--kz-subscribe-bg: #ffffff`
  - `--kz-subscribe-fg: #0a0a0a`
  - `--kz-subscribe-muted: rgba(10, 10, 10, 0.6)`
  - `--kz-subscribe-line: rgba(10, 10, 10, 0.14)`
  - `--kz-subscribe-line-hover: rgba(10, 10, 10, 0.3)`
  - `--kz-subscribe-focus: #0a0a0a`
  - `--kz-subscribe-halo: rgba(10, 10, 10, 0.04)`
  - `--kz-subscribe-error: #0a0a0a` — monochrome by default: an icon and a message, never colour alone
  - `--kz-subscribe-ink: #0a0a0a` — the button and the tick
  - `--kz-subscribe-ink-hover: #2a2a2a`
  - `--kz-subscribe-on-ink: #ffffff`
  - `--kz-subscribe-width: var(--kz-field-width, 440px)`
  - `--kz-subscribe-height: 56px`
  - `--kz-subscribe-button: 44px` — the button's height, inside the pill
  - `--kz-subscribe-pad: 22px` — from the pill's edge to the text
  - `--kz-subscribe-ease: cubic-bezier(0.22, 1, 0.36, 1)`
  - `--kz-subscribe-swap: cubic-bezier(0.65, 0, 0.35, 1)` — the pill leaving, the thanks arriving
- Modifiers: `.kodza-subscribe--icon`
- Attributes:
  - `data-error` (e.g. `Enter a real email address.`)
  - `data-fail`
  - `data-failed`
  - `data-state` (e.g. `sending`, `done`)
- Events: `kodza:subscribe` (bubbling, from the root)
- Hooks on the root element: `root.kodzaSubscribe` (see the comment at the top of the JS)
- Lifecycle: `kodza:init` / `kodza:destroy` on `document`, with `{ detail: { root } }` to target a container.

## Keyboard

What each key does, by where the focus is. Keep it working when you adapt the HTML: same elements, same classes.

- In the field (focus in `.kodza-subscribe__input`):
  - `Enter`: Sends the address, or says what is wrong with it

## 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-subscribe {
    --kz-subscribe-bg: #161616;
    --kz-subscribe-fg: #f2f2f0;
    --kz-subscribe-muted: rgba(242, 242, 240, 0.62);
    --kz-subscribe-line: rgba(255, 255, 255, 0.14);
    --kz-subscribe-line-hover: rgba(255, 255, 255, 0.3);
    --kz-subscribe-focus: #f2f2f0;
    --kz-subscribe-halo: rgba(255, 255, 255, 0.06);
    --kz-subscribe-error: #f2f2f0;
    --kz-subscribe-ink: #f2f2f0;
    --kz-subscribe-ink-hover: #d6d6d4;
    --kz-subscribe-on-ink: #0a0a0a;
  }
}
```

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

## Use it

### Plain HTML page

- CSS: `kodza/kodza-subscribe-field.css` next to the page (the Files commands as they are), linked in `<head>`: `<link rel="stylesheet" href="kodza/kodza-subscribe-field.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-subscribe-field.js`, loaded with `<script src="kodza/kodza-subscribe-field.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-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). 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-pill` sets the pills (`0` squares them).
- Width: a form sets it once for every Kodza field, on the form or on `:root` (`--kz-field-width: 100%` fills the column). Unset, nothing changes.
- 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$/{r kodza/kodza-subscribe-field.css' -e 'd' -e '}' -e '/^KODZA-JS$/{r kodza/kodza-subscribe-field.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-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).
- 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-pill` sets the pills (`0` squares them).
- Width: a form sets it once for every Kodza field, on the form or on `:root` (`--kz-field-width: 100%` fills the column). Unset, nothing changes.
- 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.
- 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.
- Forms: there is nowhere to send them. Handle `submit` in your script with `event.preventDefault()` and show the result in the page.

### 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.
- 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-subscribe-field', $uri . 'kodza-subscribe-field.css', [], filemtime($dir . 'kodza-subscribe-field.css'));
    wp_enqueue_script('kodza-subscribe-field', $uri . 'kodza-subscribe-field.js', [], filemtime($dir . 'kodza-subscribe-field.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: by default, match the theme's palette. After the component's CSS, point these variables at the theme's colours, on the component root, Kodza's value as the fallback:
  `.kodza-subscribe { --kz-subscribe-fg: var(TEXT, #0a0a0a); --kz-subscribe-bg: var(BACKGROUND, #ffffff); --kz-subscribe-ink: var(ACCENT, #0a0a0a); --kz-subscribe-on-ink: var(BACKGROUND, #ffffff); }`
  TEXT, BACKGROUND and ACCENT (the colour the theme fills its own buttons with) are the theme's own colour variables — block themes (theme.json, like Twenty Twenty-Five): `--wp--preset--color--contrast`, `--wp--preset--color--base`, `--wp--preset--color--contrast` (they fill their buttons with it; their accent-1… colours are decorative); Astra: `--ast-global-color-2`, `--ast-global-color-4`, `--ast-global-color-0`; Kadence: `--global-palette3`, `--global-palette9`, `--global-palette1`; GeneratePress: `--contrast`, `--base-3`, `--accent`; Blocksy: `--theme-palette-color-4`, `--theme-palette-color-8`, `--theme-palette-color-1`. Use only these names, and only if the site really has them (the theme's CSS, or Styles → Colors): the `--wp--preset--color--black`, `--white`, `--vivid-…` that WordPress adds everywhere are not the theme's palette. Another theme, or one without these variables (Hello Elementor, OceanWP): leave the variables alone, it keeps Kodza's monochrome; same when the developer asks for monochrome or the Kodza look. Leave the translucent greys (`rgba(10, 10, 10, …)`) as they are: they suit any light background. On a dark palette, set the other variables from Dark mode too.
- 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.
- 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-subscribe-field.css` and `assets/kodza-subscribe-field.js` (the Files commands with `-o assets/…`).
- In the section: `{{ 'kodza-subscribe-field.css' | asset_url | stylesheet_tag }}` and `<script src="{{ 'kodza-subscribe-field.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/`): `SubscribeField.tsx` (below), the CSS block under Code saved as `subscribe-field.css` and the JS block as `subscribe-field.js`, both as they are. The HTML block is already inside the component: skip it.
- Use it: `import { SubscribeField } from '@/components/kodza/SubscribeField';` then `<SubscribeField />`. Props: `variant` ("icon", or several in an array), `vars` (the `--kz-…` variables listed under API, e.g. `vars={{ '--kz-subscribe-bg': … }}`), `onSubscribe` (the `kodza:subscribe` event), `className`, `style` and the other props of its `<form>` (`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 './subscribe-field.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 — Subscribe Field, for React. From https://kodza.dev/components/subscribe-field/
// 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: subscribe-field.css and subscribe-field.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 './subscribe-field.css';

type Variant = "icon";

export type SubscribeFieldProps = Omit<ComponentPropsWithoutRef<'form'>, "children" | "variant" | "vars" | "onSubscribe"> & {
  /** Modifier class(es): .kodza-subscribe--icon */
  variant?: Variant | Variant[];
  /** Settings, as CSS variables on the root */
  vars?: {
    /** default: #ffffff */
    "--kz-subscribe-bg"?: string | number;
    /** default: #0a0a0a */
    "--kz-subscribe-fg"?: string | number;
    /** default: rgba(10, 10, 10, 0.6) */
    "--kz-subscribe-muted"?: string | number;
    /** default: rgba(10, 10, 10, 0.14) */
    "--kz-subscribe-line"?: string | number;
    /** default: rgba(10, 10, 10, 0.3) */
    "--kz-subscribe-line-hover"?: string | number;
    /** default: #0a0a0a */
    "--kz-subscribe-focus"?: string | number;
    /** default: rgba(10, 10, 10, 0.04) */
    "--kz-subscribe-halo"?: string | number;
    /** monochrome by default: an icon and a message, never colour alone — default: #0a0a0a */
    "--kz-subscribe-error"?: string | number;
    /** the button and the tick — default: #0a0a0a */
    "--kz-subscribe-ink"?: string | number;
    /** default: #2a2a2a */
    "--kz-subscribe-ink-hover"?: string | number;
    /** default: #ffffff */
    "--kz-subscribe-on-ink"?: string | number;
    /** default: var(--kz-field-width, 440px) */
    "--kz-subscribe-width"?: string | number;
    /** default: 56px */
    "--kz-subscribe-height"?: string | number;
    /** the button's height, inside the pill — default: 44px */
    "--kz-subscribe-button"?: string | number;
    /** from the pill's edge to the text — default: 22px */
    "--kz-subscribe-pad"?: string | number;
    /** default: cubic-bezier(0.22, 1, 0.36, 1) */
    "--kz-subscribe-ease"?: string | number;
    /** the pill leaving, the thanks arriving — default: cubic-bezier(0.65, 0, 0.35, 1) */
    "--kz-subscribe-swap"?: string | number;
  };
  /** "kodza:subscribe", fired by the script (bubbles from the root) */
  onSubscribe?: (event: CustomEvent) => void;
  className?: string;
};

export function SubscribeField({ variant, vars, onSubscribe, className, style, ...rest }: SubscribeFieldProps) {
  const ref = useRef<ComponentRef<'form'>>(null);
  const classes = ["kodza-subscribe", ...([] as string[]).concat(variant ?? []).map((v) => `kodza-subscribe--${v}`), 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('./subscribe-field.js').then(() => {
      if (live) document.dispatchEvent(new CustomEvent('kodza:init', { detail: { root } }));
    });
    return () => {
      live = false;
      document.dispatchEvent(new CustomEvent('kodza:destroy', { detail: { root } }));
    };
  }, [key]);

  useEffect(() => {
    const root = ref.current;
    if (!root || !onSubscribe) return;
    const listener = (event: Event) => onSubscribe(event as CustomEvent);
    root.addEventListener("kodza:subscribe", listener);
    return () => root.removeEventListener("kodza:subscribe", listener);
  }, [onSubscribe, key]);

  return (
    <form action="https://example.com/subscribe" method="post" key={key} {...rest} className={classes} data-kodza-manual style={{ ...vars, ...style } as CSSProperties} ref={ref}>
      <div className="kodza-subscribe__stage">
        <div className="kodza-subscribe__pill">
          <label className="kodza-subscribe__box">
            <input className="kodza-subscribe__input" type="email" name="email" placeholder=" " autoComplete="email" required data-error="Enter a real email address." />
            {' '}
            <span className="kodza-subscribe__label">Email</span>
          </label>
          {' '}
          <button className="kodza-subscribe__button" type="submit">
            <span className="kodza-subscribe__word">Subscribe</span>
            {' '}
            <span className="kodza-subscribe__spinner" aria-hidden="true">
              <svg viewBox="0 0 24 24">
                <circle cx="12" cy="12" r="8.5" />
                <circle cx="12" cy="12" r="8.5" pathLength="100" />
              </svg>
            </span>
          </button>
        </div>
        <p className="kodza-subscribe__done" role="status" tabIndex={-1}>
          <span className="kodza-subscribe__tick" aria-hidden="true">
            <svg viewBox="0 0 24 24">
              <path d="M7.5 12.5l3 3 6-6.5" pathLength="1" />
            </svg>
          </span>
          {' '}
          <span className="kodza-subscribe__thanks">You're in. Check your inbox.</span>
        </p>
      </div>
      <p className="kodza-subscribe__note">
        <span className="kodza-subscribe__hint">One email when something ships. Unsubscribe in one click.</span>
        {' '}
        <span className="kodza-subscribe__error" aria-live="polite" />
      </p>
    </form>
  );
}
```

## Code

```html
<!-- action: your list's form URL (Mailchimp, Brevo, a WordPress plugin), or cancel "kodza:subscribe" and send it yourself -->
<form class="kodza-subscribe" action="https://example.com/subscribe" method="post">
  <div class="kodza-subscribe__stage">
    <div class="kodza-subscribe__pill">
      <label class="kodza-subscribe__box">
        <input class="kodza-subscribe__input" type="email" name="email" placeholder=" " autocomplete="email" required data-error="Enter a real email address.">
        <span class="kodza-subscribe__label">Email</span>
      </label>
      <button class="kodza-subscribe__button" type="submit">
        <span class="kodza-subscribe__word">Subscribe</span>
        <span class="kodza-subscribe__spinner" aria-hidden="true"><svg viewBox="0 0 24 24"><circle cx="12" cy="12" r="8.5" /><circle cx="12" cy="12" r="8.5" pathLength="100" /></svg></span>
      </button>
    </div>
    <p class="kodza-subscribe__done" role="status" tabindex="-1">
      <span class="kodza-subscribe__tick" aria-hidden="true"><svg viewBox="0 0 24 24"><path d="M7.5 12.5l3 3 6-6.5" pathLength="1" /></svg></span>
      <span class="kodza-subscribe__thanks">You're in. Check your inbox.</span>
    </p>
  </div>
  <p class="kodza-subscribe__note">
    <span class="kodza-subscribe__hint">One email when something ships. Unsubscribe in one click.</span>
    <span class="kodza-subscribe__error" aria-live="polite"></span>
  </p>
</form>

<form class="kodza-subscribe kodza-subscribe--icon" action="https://example.com/subscribe" method="post">
  <div class="kodza-subscribe__stage">
    <div class="kodza-subscribe__pill">
      <label class="kodza-subscribe__box">
        <input class="kodza-subscribe__input" type="email" name="email" placeholder=" " autocomplete="email" required data-error="Enter a real email address.">
        <span class="kodza-subscribe__label">Email for the launch</span>
      </label>
      <button class="kodza-subscribe__button" type="submit" aria-label="Subscribe">
        <span class="kodza-subscribe__word" aria-hidden="true"><svg viewBox="0 0 24 24"><path d="M5 12h14M13 6l6 6-6 6" /></svg></span>
        <span class="kodza-subscribe__spinner" aria-hidden="true"><svg viewBox="0 0 24 24"><circle cx="12" cy="12" r="8.5" /><circle cx="12" cy="12" r="8.5" pathLength="100" /></svg></span>
      </button>
    </div>
    <p class="kodza-subscribe__done" role="status" tabindex="-1">
      <span class="kodza-subscribe__tick" aria-hidden="true"><svg viewBox="0 0 24 24"><path d="M7.5 12.5l3 3 6-6.5" pathLength="1" /></svg></span>
      <span class="kodza-subscribe__thanks">Saved. We write once, on launch day.</span>
    </p>
  </div>
  <p class="kodza-subscribe__note">
    <span class="kodza-subscribe__hint">For the launch. Then we leave you alone.</span>
    <span class="kodza-subscribe__error" aria-live="polite"></span>
  </p>
</form>
```

```css
/* Kodza License: free to use, client work included. Not to resell or redistribute, ported or not: https://kodza.dev/docs/#print-license */
/* Kodza — Subscribe Field
   An email field and its button in one pill. Sent, the button's word rolls away for a turning
   ring (the width never moves), then the pill rises out and the thanks comes up in its place,
   its tick drawing in. A wrong address swaps the hint for the error, like every Kodza field.
   The form posts to its own action (Mailchimp, Brevo, a WordPress plugin), or your code sends
   it: see component.js. The --icon variant trades the word for an arrow.
   Everything is tuned with the --kz-subscribe-* variables. Its width follows --kz-field-width,
   shared by every Kodza form field. */
.kodza-subscribe {
  --kz-subscribe-bg: #ffffff;
  --kz-subscribe-fg: #0a0a0a;
  --kz-subscribe-muted: rgba(10, 10, 10, 0.6);
  --kz-subscribe-line: rgba(10, 10, 10, 0.14);
  --kz-subscribe-line-hover: rgba(10, 10, 10, 0.3);
  --kz-subscribe-focus: #0a0a0a;
  --kz-subscribe-halo: rgba(10, 10, 10, 0.04);
  --kz-subscribe-error: #0a0a0a; /* monochrome by default: an icon and a message, never colour alone */
  --kz-subscribe-ink: #0a0a0a; /* the button and the tick */
  --kz-subscribe-ink-hover: #2a2a2a;
  --kz-subscribe-on-ink: #ffffff;
  --kz-subscribe-width: var(--kz-field-width, 440px);
  --kz-subscribe-height: 56px;
  --kz-subscribe-button: 44px; /* the button's height, inside the pill */
  --kz-subscribe-pad: 22px; /* from the pill's edge to the text */
  --kz-subscribe-ease: cubic-bezier(0.22, 1, 0.36, 1);
  --kz-subscribe-swap: cubic-bezier(0.65, 0, 0.35, 1); /* the pill leaving, the thanks arriving */

  display: grid;
  gap: 8px;
  width: 100%;
  max-width: var(--kz-subscribe-width);
  margin: 0;
  color: var(--kz-subscribe-fg);
}

/* The pill and the thanks share one cell: the height never jumps. The clip lets the focus
   halo show, and hides what rolls past it: the thanks comes up from behind its bottom edge */
.kodza-subscribe__stage {
  display: grid;
  clip-path: inset(-8px -8px -4px);
}

.kodza-subscribe__pill,
.kodza-subscribe__done {
  grid-area: 1 / 1;
  transition:
    transform calc(0.6s * var(--kz-motion-scale, 1)) var(--kz-subscribe-swap),
    opacity calc(0.45s * var(--kz-motion-scale, 1)) ease,
    visibility 0s linear 0s;
}

.kodza-subscribe__pill {
  position: relative;
  display: flex;
  align-items: center;
  height: var(--kz-subscribe-height);
  border-radius: var(--kz-radius-pill, 999px);
  background: var(--kz-subscribe-bg);
  box-shadow: inset 0 0 0 1px var(--kz-subscribe-line);
  transition:
    transform calc(0.6s * var(--kz-motion-scale, 1)) var(--kz-subscribe-swap),
    opacity calc(0.4s * var(--kz-motion-scale, 1)) cubic-bezier(0.4, 0, 1, 1),
    visibility 0s linear 0s,
    box-shadow calc(0.25s * var(--kz-motion-scale, 1)) ease;
}

@media (hover: hover) {
  .kodza-subscribe__pill:hover {
    box-shadow: inset 0 0 0 1px var(--kz-subscribe-line-hover);
  }
}

.kodza-subscribe__pill:has(.kodza-subscribe__input:focus) {
  box-shadow: inset 0 0 0 1.5px var(--kz-subscribe-focus), 0 0 0 4px var(--kz-subscribe-halo);
}

/* The box: the whole left part is the label, so a click anywhere focuses the input */
.kodza-subscribe__box {
  position: relative;
  display: flex;
  flex: 1;
  align-items: flex-end;
  box-sizing: border-box;
  min-width: 0;
  height: 100%;
  margin: 0;
  padding: 0 12px 9px var(--kz-subscribe-pad);
  cursor: text;
}

.kodza-subscribe__input {
  flex: 1;
  min-width: 0;
  height: 22px;
  margin: 0;
  padding: 0;
  border: 0;
  background: none;
  color: inherit;
  font: inherit;
  font-size: 15px;
  line-height: 22px;
  outline: none;
}

/* The label: inside the pill at rest, folded up above the text once focused or filled */
.kodza-subscribe__label {
  position: absolute;
  top: 50%;
  left: var(--kz-subscribe-pad);
  max-width: calc(100% - var(--kz-subscribe-pad) - 12px);
  overflow: hidden;
  color: var(--kz-subscribe-muted);
  font-size: 15px;
  line-height: 1;
  text-overflow: ellipsis;
  white-space: nowrap;
  pointer-events: none;
  transform: translateY(-50%);
  transform-origin: left top;
  transition: transform calc(0.35s * var(--kz-motion-scale, 1)) var(--kz-subscribe-ease);
}

.kodza-subscribe__box:focus-within .kodza-subscribe__label,
.kodza-subscribe__input:not(:placeholder-shown) ~ .kodza-subscribe__label {
  transform: translateY(-18px) scale(0.8);
}

/* The button: its word and its ring share one cell, so its width never moves */
.kodza-subscribe__button {
  display: inline-grid;
  flex: none;
  place-items: center;
  box-sizing: border-box;
  height: var(--kz-subscribe-button);
  margin: 0 calc((var(--kz-subscribe-height) - var(--kz-subscribe-button)) / 2) 0 0;
  padding: 0 20px;
  overflow: hidden;
  border: 0;
  border-radius: var(--kz-radius-pill, 999px);
  background: var(--kz-subscribe-ink);
  color: var(--kz-subscribe-on-ink);
  font: inherit;
  font-family: var(--kz-font-label, inherit);
  font-size: var(--kz-font-label-size, 14px);
  font-weight: var(--kz-font-label-weight, 500);
  line-height: 1;
  letter-spacing: var(--kz-font-label-tracking, -0.01em);
  text-transform: var(--kz-font-label-case, none);
  white-space: nowrap;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
  transition:
    background-color calc(0.2s * var(--kz-motion-scale, 1)) ease,
    transform calc(0.2s * var(--kz-motion-scale, 1)) var(--kz-subscribe-ease);
}

@media (hover: hover) {
  .kodza-subscribe__button:hover {
    background: var(--kz-subscribe-ink-hover);
  }
}

.kodza-subscribe__button:active {
  transform: scale(0.97);
}

.kodza-subscribe__button:focus-visible {
  outline: 2px solid var(--kz-subscribe-focus);
  outline-offset: 2px;
}

.kodza-subscribe__word,
.kodza-subscribe__spinner {
  grid-area: 1 / 1;
  transition: transform calc(0.5s * var(--kz-motion-scale, 1)) var(--kz-subscribe-ease);
}

.kodza-subscribe__word {
  display: block;
}

.kodza-subscribe__spinner {
  width: 18px;
  height: 18px;
  transform: translateY(calc(var(--kz-subscribe-button) * 0.75));
}

.kodza-subscribe svg {
  display: block;
  width: 100%;
  height: 100%;
  overflow: visible;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.kodza-subscribe__spinner svg {
  stroke-width: 2.2;
}

.kodza-subscribe__spinner circle:first-child {
  opacity: 0.25;
}

.kodza-subscribe__spinner circle:nth-child(2) {
  stroke-dasharray: 28 100;
  transform: rotate(-90deg);
  transform-origin: 50% 50%;
}

/* Sending: the word leaves through the top, the ring comes up and turns */
.kodza-subscribe:is([data-state="sending"], [data-state="done"]) .kodza-subscribe__word {
  transform: translateY(calc(var(--kz-subscribe-button) * -0.75));
}

.kodza-subscribe:is([data-state="sending"], [data-state="done"]) .kodza-subscribe__spinner {
  transform: none;
}

.kodza-subscribe:is([data-state="sending"], [data-state="done"]) .kodza-subscribe__spinner svg {
  animation: kodza-subscribe-turn calc(0.9s * var(--kz-motion-scale, 1)) linear infinite;
}

.kodza-subscribe[data-state="sending"] .kodza-subscribe__button {
  cursor: progress;
}

@keyframes kodza-subscribe-turn {
  to {
    transform: rotate(360deg);
  }
}

/* The thanks: waits below, comes up as the pill rises out */
.kodza-subscribe__done {
  display: flex;
  align-items: center;
  gap: 12px;
  box-sizing: border-box;
  min-width: 0;
  height: var(--kz-subscribe-height);
  margin: 0;
  padding: 0 calc((var(--kz-subscribe-height) - 32px) / 2);
  font-size: 15px;
  font-weight: 500;
  line-height: 1.3;
  letter-spacing: -0.01em;
  text-wrap: pretty;
  outline: none;
  opacity: 0;
  visibility: hidden;
  transform: translateY(calc(100% + 12px));
  transition-delay: 0s, 0s, calc(0.6s * var(--kz-motion-scale, 1));
}

.kodza-subscribe__done:focus-visible {
  outline: 2px solid var(--kz-subscribe-focus);
  outline-offset: 2px;
  border-radius: var(--kz-radius-pill, 999px);
}

.kodza-subscribe__tick {
  display: grid;
  flex: none;
  place-items: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--kz-subscribe-ink);
  color: var(--kz-subscribe-on-ink);
  transform: scale(0.6);
  transition: transform calc(0.5s * var(--kz-motion-scale, 1)) var(--kz-subscribe-ease);
}

.kodza-subscribe__tick svg {
  width: 18px;
  height: 18px;
  stroke-width: 2.2;
}

.kodza-subscribe__tick path {
  stroke-dasharray: 1;
  stroke-dashoffset: 1;
  transition: stroke-dashoffset calc(0.2s * var(--kz-motion-scale, 1)) ease;
}

.kodza-subscribe[data-state="done"] .kodza-subscribe__pill {
  opacity: 0;
  visibility: hidden;
  transform: translateY(calc(-100% - 12px));
  transition-delay: 0s, calc(0.14s * var(--kz-motion-scale, 1)), calc(0.6s * var(--kz-motion-scale, 1)), 0s;
}

.kodza-subscribe[data-state="done"] .kodza-subscribe__done {
  opacity: 1;
  visibility: visible;
  transform: none;
  transition-delay: calc(0.06s * var(--kz-motion-scale, 1)), calc(0.22s * var(--kz-motion-scale, 1)), 0s;
}

.kodza-subscribe[data-state="done"] .kodza-subscribe__tick {
  transform: none;
  transition-delay: calc(0.3s * var(--kz-motion-scale, 1));
}

.kodza-subscribe[data-state="done"] .kodza-subscribe__tick path {
  stroke-dashoffset: 0;
  transition: stroke-dashoffset calc(0.4s * var(--kz-motion-scale, 1)) var(--kz-subscribe-ease) calc(0.45s * var(--kz-motion-scale, 1));
}

/* The --icon variant: a round button with an arrow */
.kodza-subscribe--icon .kodza-subscribe__button {
  width: var(--kz-subscribe-button);
  padding: 0;
}

.kodza-subscribe--icon .kodza-subscribe__word {
  width: 18px;
  height: 18px;
  padding: 0;
}

.kodza-subscribe--icon .kodza-subscribe__word svg {
  stroke-width: 2;
}

@media (hover: hover) {
  .kodza-subscribe--icon:not([data-state]) .kodza-subscribe__button:hover .kodza-subscribe__word {
    transform: translateX(2px);
  }
}

/* The note: the hint and the error share one line, and swap */
.kodza-subscribe__note {
  display: grid;
  margin: 0;
  padding: 0 var(--kz-subscribe-pad);
  overflow: hidden;
  font-family: var(--kz-font-label, inherit);
  font-size: var(--kz-font-label-size, 13px);
  font-weight: var(--kz-font-label-weight, inherit);
  letter-spacing: var(--kz-font-label-tracking, inherit);
  line-height: var(--kz-font-label-leading, 1.4);
  text-transform: var(--kz-font-label-case, inherit);
}

.kodza-subscribe__hint,
.kodza-subscribe__error {
  grid-area: 1 / 1;
  transition:
    opacity calc(0.25s * var(--kz-motion-scale, 1)) ease,
    transform calc(0.4s * var(--kz-motion-scale, 1)) var(--kz-subscribe-ease);
}

.kodza-subscribe__hint {
  color: var(--kz-subscribe-muted);
}

.kodza-subscribe__error {
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--kz-subscribe-error);
  font-weight: var(--kz-font-label-weight, 500);
  opacity: 0;
  transform: translateY(100%);
}

.kodza-subscribe__error::before {
  content: "";
  flex: none;
  width: 14px;
  height: 14px;
  background: currentColor;
  -webkit-mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Ccircle cx='8' cy='8' r='6.5' fill='none' stroke='black' stroke-width='1.5'/%3E%3Cpath d='M8 4.5v4.2M8 10.9v.1' stroke='black' stroke-width='1.6' stroke-linecap='round'/%3E%3C/svg%3E") center / contain no-repeat;
  mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Ccircle cx='8' cy='8' r='6.5' fill='none' stroke='black' stroke-width='1.5'/%3E%3Cpath d='M8 4.5v4.2M8 10.9v.1' stroke='black' stroke-width='1.6' stroke-linecap='round'/%3E%3C/svg%3E") center / contain no-repeat;
}

/* A wrong address: a firmer outline, and the error replaces the hint. A failed send shows its
   message the same way, without blaming the address */
.kodza-subscribe:has(.kodza-subscribe__input[aria-invalid="true"]) .kodza-subscribe__pill {
  box-shadow: inset 0 0 0 1.5px var(--kz-subscribe-error);
}

.kodza-subscribe:is(:has(.kodza-subscribe__input[aria-invalid="true"]), [data-failed]) .kodza-subscribe__hint {
  opacity: 0;
  transform: translateY(-100%);
}

.kodza-subscribe:is(:has(.kodza-subscribe__input[aria-invalid="true"]), [data-failed]) .kodza-subscribe__error {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  .kodza-subscribe:is([data-state="sending"], [data-state="done"]) .kodza-subscribe__spinner svg {
    animation: none;
  }

  .kodza-subscribe__pill,
  .kodza-subscribe__done,
  .kodza-subscribe__label,
  .kodza-subscribe__word,
  .kodza-subscribe__spinner,
  .kodza-subscribe__tick,
  .kodza-subscribe__tick path,
  .kodza-subscribe__hint,
  .kodza-subscribe__error {
    transition-duration: 0.01ms !important;
    transition-delay: 0s !important;
  }
}

/* Theming example — on a dark background:
.dark-section .kodza-subscribe {
  --kz-subscribe-bg: #161616;
  --kz-subscribe-fg: #f2f2f0;
  --kz-subscribe-muted: rgba(242, 242, 240, 0.62);
  --kz-subscribe-line: rgba(255, 255, 255, 0.14);
  --kz-subscribe-line-hover: rgba(255, 255, 255, 0.3);
  --kz-subscribe-focus: #f2f2f0;
  --kz-subscribe-halo: rgba(255, 255, 255, 0.06);
  --kz-subscribe-error: #f2f2f0;
  --kz-subscribe-ink: #f2f2f0;
  --kz-subscribe-ink-hover: #d6d6d4;
  --kz-subscribe-on-ink: #0a0a0a;
}
*/

/* kodza-guard e3a699ad4b23 — 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-subscribe__button):not(#_) {
  outline: revert;
  outline-offset: revert;
}

:where(.kodza-subscribe__done):not(#_) {
  border-radius: revert;
  outline-offset: revert;
}

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

.kodza-subscribe:not(#_) {
  border: revert;
  padding: revert;
  border-radius: revert;
  outline: revert;
  text-decoration: revert;
  transition: revert;
  list-style: revert;
  box-sizing: revert;
  position: revert;
  background-color: revert;
  background-image: revert;
  box-shadow: revert;
  outline-offset: revert;
  appearance: revert;
  max-height: 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-subscribe__stage:not(#_),
.kodza-subscribe__pill:not(#_),
.kodza-subscribe__label:not(#_),
.kodza-subscribe__word:not(#_),
.kodza-subscribe__spinner:not(#_),
.kodza-subscribe__tick:not(#_),
.kodza-subscribe__thanks:not(#_),
.kodza-subscribe__hint:not(#_),
.kodza-subscribe__error:not(#_) {
  box-sizing: revert;
}

.kodza-subscribe__box:not(#_) {
  border: revert;
  border-radius: revert;
  outline: revert;
  text-decoration: revert;
  transition: revert;
  list-style: revert;
  float: 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-subscribe__input:not(#_) {
  border-radius: revert;
  text-decoration: revert;
  transition: revert;
  list-style: revert;
  box-sizing: revert;
  float: revert;
  position: revert;
  box-shadow: revert;
  outline-offset: revert;
  appearance: revert;
  max-width: revert;
  max-height: revert;
  letter-spacing: revert;
  text-transform: revert;
  text-underline-offset: revert;
  text-align: revert;
  text-indent: revert;
  text-shadow: revert;
  vertical-align: revert;
  white-space: revert;
  min-height: revert;
}

.kodza-subscribe__button:not(#_) {
  text-decoration: revert;
  list-style: revert;
  float: revert;
  position: revert;
  box-shadow: revert;
  appearance: revert;
  max-width: revert;
  max-height: revert;
  text-underline-offset: revert;
  text-align: revert;
  text-indent: revert;
  text-shadow: revert;
  vertical-align: revert;
  min-height: revert;
}

.kodza-subscribe__done:not(#_) {
  border: revert;
  text-decoration: revert;
  list-style: revert;
  float: revert;
  position: revert;
  background-color: revert;
  background-image: revert;
  box-shadow: revert;
  appearance: revert;
  max-width: revert;
  max-height: revert;
  color: revert;
  font-family: revert;
  font-style: revert;
  text-transform: revert;
  text-underline-offset: revert;
  text-align: revert;
  text-indent: revert;
  text-shadow: revert;
  vertical-align: revert;
}

.kodza-subscribe__note:not(#_) {
  border: 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;
  color: revert;
  font-style: revert;
  text-underline-offset: revert;
  text-align: revert;
  text-indent: revert;
  text-shadow: revert;
  vertical-align: revert;
}

.kodza-subscribe__spinner svg:where(:not([class*="kodza-"])):not(#_),
.kodza-subscribe__tick svg:where(:not([class*="kodza-"])):not(#_),
.kodza-subscribe__word svg: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;
  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-subscribe__input:not(#_):where(:not([hidden])) {
  display: revert;
}

.kodza-subscribe__input:not(#_):where([hidden]) {
  display: none;
}

.kodza-subscribe__error:not(#_)::before {
  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-subscribe:not(#_) {
  display: grid;
  color: var(--kz-subscribe-fg);
}

.kodza-subscribe:not(#_) {
  width: min(100%, var(--kz-subscribe-width));
}

.kodza-subscribe__done:not(#_) {
  transition: transform calc(0.6s * var(--kz-motion-scale, 1)) var(--kz-subscribe-swap),
    opacity calc(0.45s * var(--kz-motion-scale, 1)) ease,
    visibility 0s linear 0s;
}

.kodza-subscribe__box:not(#_) {
  position: relative;
  display: flex;
  box-sizing: border-box;
  margin: 0;
  padding: 0 12px 9px var(--kz-subscribe-pad);
}

.kodza-subscribe__input:not(#_) {
  flex: 1;
  min-width: 0;
  height: 22px;
  margin: 0;
  padding: 0;
  border: 0;
  background: none;
  color: inherit;
  font: inherit;
  font-size: 15px;
  line-height: 22px;
  outline: none;
}

.kodza-subscribe__button:not(#_) {
  display: inline-grid;
  flex: none;
  place-items: center;
  box-sizing: border-box;
  height: var(--kz-subscribe-button);
  margin: 0 calc((var(--kz-subscribe-height) - var(--kz-subscribe-button)) / 2) 0 0;
  padding: 0 20px;
  overflow: hidden;
  border: 0;
  border-radius: var(--kz-radius-pill, 999px);
  background: var(--kz-subscribe-ink);
  color: var(--kz-subscribe-on-ink);
  font: inherit;
  font-family: var(--kz-font-label, inherit);
  font-size: var(--kz-font-label-size, 14px);
  font-weight: var(--kz-font-label-weight, 500);
  line-height: 1;
  letter-spacing: var(--kz-font-label-tracking, -0.01em);
  text-transform: var(--kz-font-label-case, none);
  white-space: nowrap;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
  transition: background-color calc(0.2s * var(--kz-motion-scale, 1)) ease,
    transform calc(0.2s * var(--kz-motion-scale, 1)) var(--kz-subscribe-ease);
}

@media (hover: hover) {
  .kodza-subscribe__button:hover:not(#_) {
    background: var(--kz-subscribe-ink-hover);
  }
}

.kodza-subscribe__button:active:not(#_) {
  transform: scale(0.97);
}

.kodza-subscribe__button:focus-visible:not(#_) {
  outline: 2px solid var(--kz-subscribe-focus);
  outline-offset: 2px;
}

.kodza-subscribe svg:not(#_) {
  display: block;
}

.kodza-subscribe[data-state="sending"] .kodza-subscribe__button:not(#_) {
  cursor: progress;
}

.kodza-subscribe__done:not(#_) {
  display: flex;
  box-sizing: border-box;
  margin: 0;
  padding: 0 calc((var(--kz-subscribe-height) - 32px) / 2);
  font-size: 15px;
  font-weight: 500;
  line-height: 1.3;
  letter-spacing: -0.01em;
  outline: none;
  transition-delay: 0s, 0s, calc(0.6s * var(--kz-motion-scale, 1));
}

.kodza-subscribe__done:focus-visible:not(#_) {
  outline: 2px solid var(--kz-subscribe-focus);
  outline-offset: 2px;
  border-radius: var(--kz-radius-pill, 999px);
}

.kodza-subscribe[data-state="done"] .kodza-subscribe__done:not(#_) {
  transition-delay: calc(0.06s * var(--kz-motion-scale, 1)), calc(0.22s * var(--kz-motion-scale, 1)), 0s;
}

.kodza-subscribe--icon .kodza-subscribe__button:not(#_) {
  width: var(--kz-subscribe-button);
  padding: 0;
}

.kodza-subscribe__note:not(#_) {
  display: grid;
  margin: 0;
  padding: 0 var(--kz-subscribe-pad);
  font-family: var(--kz-font-label, inherit);
  font-size: var(--kz-font-label-size, 13px);
  font-weight: var(--kz-font-label-weight, inherit);
  letter-spacing: var(--kz-font-label-tracking, inherit);
  line-height: var(--kz-font-label-leading, 1.4);
  text-transform: var(--kz-font-label-case, inherit);
}

@media (prefers-reduced-motion: reduce) {
  .kodza-subscribe__done:not(#_) {
    transition-duration: 0.01ms !important;
    transition-delay: 0s !important;
  }
}
```

```js
// Kodza License: free to use, client work included. Not to resell or redistribute, ported or not: https://kodza.dev/docs/#print-license
// Kodza — Subscribe Field
// Checks the address before anything leaves, turns the ring while it is sent, then brings the
// thanks up in place of the pill. Sending it is yours, two ways:
// - the form's action and method (Mailchimp, Brevo, a WordPress plugin's endpoint): the script
//   posts the fields there. Another site's answer cannot be read, so it counts as sent;
// - or cancel the "kodza:subscribe" event (detail: { data, done, fail }) and send it yourself,
//   then call detail.done(), or detail.fail("Your message") to show it in place of the hint.
// root.kodzaSubscribe = { done, fail, reset } does the same from anywhere. The failure message
// defaults to data-fail on the form. The motion is CSS.
(() => {
  const SELECTOR = '.kodza-subscribe';
  // The ring turns at least this long (ms), so a fast answer never flashes it
  const MIN_SPIN = 700;
  const FAIL_TEXT = 'Could not send. Try again.';

  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;
  };
  let uid = 0;

  // 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 pace = paceOf(root);
    const still = reduceMotion || !pace; // the still path: no motion asked, by the visitor or the site
    const form = root.closest('form');
    const input = root.querySelector('.kodza-subscribe__input');
    const pill = root.querySelector('.kodza-subscribe__pill');
    const done = root.querySelector('.kodza-subscribe__done');
    const thanks = root.querySelector('.kodza-subscribe__thanks');
    const hint = root.querySelector('.kodza-subscribe__hint');
    const error = root.querySelector('.kodza-subscribe__error');
    if (!form || !input || !pill || !done || !error) return;
    const minSpin = still ? 0 : MIN_SPIN * pace;

    const prefix = `kodza-subscribe-${++uid}`;
    const described = [];
    if (hint) described.push((hint.id = `${prefix}-hint`));
    described.push((error.id = `${prefix}-error`));
    input.setAttribute('aria-describedby', described.join(' '));

    // The thanks is written when it shows: a status that receives text is read out
    const message = thanks ? thanks.textContent.trim() : '';
    if (thanks) thanks.textContent = '';
    // The script says what is wrong, in the field's own line, instead of the browser's bubble
    const validated = form.noValidate;
    form.noValidate = true;

    // Focus is only moved for a visitor on the keyboard: after a click, a ring would show
    let fromKeyboard = false;
    root.addEventListener('keydown', () => { fromKeyboard = true; }, { signal });
    root.addEventListener('pointerdown', () => { fromKeyboard = false; }, { signal });

    const check = () => {
      const bad = !input.validity.valid;
      error.textContent = bad ? input.dataset.error || input.validationMessage : '';
      input.setAttribute('aria-invalid', String(bad));
      return !bad;
    };

    const set = (state) => {
      if (state) root.dataset.state = state;
      else delete root.dataset.state;
      input.readOnly = Boolean(state);
      if (state === 'sending') root.setAttribute('aria-busy', 'true');
      else root.removeAttribute('aria-busy');
      pill.inert = state === 'done';
      if (thanks) thanks.textContent = state === 'done' ? message : '';
    };

    let token = 0; // a reset or a new send voids the answer of the one before
    let timer = 0;
    let started = 0;
    // An answer lands once the ring has turned long enough
    const later = (id, fn) => {
      clearTimeout(timer);
      timer = setTimeout(() => id === token && root.dataset.state === 'sending' && fn(), Math.max(0, minSpin - (performance.now() - started)));
    };
    const finish = () => {
      set('done');
      if (fromKeyboard) done.focus({ preventScroll: true });
    };
    const failWith = (text) => {
      set();
      root.dataset.failed = '';
      error.textContent = text || root.dataset.fail || FAIL_TEXT;
    };
    const reset = () => {
      token += 1;
      clearTimeout(timer);
      delete root.dataset.failed;
      input.value = '';
      input.removeAttribute('aria-invalid');
      error.textContent = '';
      set();
    };

    const send = () => {
      const id = ++token;
      started = performance.now();
      const data = new FormData(form);
      set('sending');
      const ok = () => later(id, finish);
      const ko = (text) => later(id, () => failWith(text));
      const mine = root.dispatchEvent(new CustomEvent('kodza:subscribe', { bubbles: true, cancelable: true, detail: { data, done: ok, fail: ko } }));
      if (!mine) return; // the page sends it, and calls done or fail
      const action = form.getAttribute('action');
      if (!action) {
        console.warn('Kodza Subscribe Field: the form has no action, and nothing handled kodza:subscribe.');
        return ko();
      }
      const url = new URL(action, location.href);
      const method = (form.getAttribute('method') || 'get').toUpperCase();
      const fields = new URLSearchParams();
      data.forEach((value, name) => typeof value === 'string' && fields.append(name, value));
      if (method === 'GET') fields.forEach((value, name) => url.searchParams.append(name, value));
      const same = url.origin === location.origin;
      fetch(url, {
        method,
        body: method === 'GET' ? undefined : fields,
        mode: same ? 'same-origin' : 'no-cors',
        credentials: same ? 'same-origin' : 'omit',
        signal,
      }).then((response) => (response.type === 'opaque' || response.ok ? ok() : ko()), () => !signal.aborted && ko());
    };

    form.addEventListener('submit', (event) => {
      if (event.submitter && !root.contains(event.submitter)) return; // another button of a larger form
      event.preventDefault();
      if (root.dataset.state) return;
      delete root.dataset.failed;
      if (check()) send();
      else input.focus();
    }, { signal });
    // Judged when the visitor leaves a filled field, then live while they fix it
    input.addEventListener('blur', () => input.value && !root.dataset.state && check(), { signal });
    input.addEventListener('input', () => {
      if (root.dataset.failed !== undefined) {
        delete root.dataset.failed;
        error.textContent = '';
      }
      if (input.getAttribute('aria-invalid') === 'true') check();
    }, { signal });

    root.kodzaSubscribe = {
      done: () => later(token, finish),
      fail: (text) => later(token, () => failWith(text)),
      reset,
    };
    signal.addEventListener('abort', () => {
      token += 1;
      clearTimeout(timer);
      delete root.kodzaSubscribe;
      form.noValidate = validated;
    });
  }

  // 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).