# Radio

> Real radio buttons with one dot for the whole group: pick another option and the dot travels to it, stretching on the way like a drop of ink.

Forms · radio, form, cards, choice · HTML, CSS, vanilla JS · no dependencies · updated 2026-10-16
Demo: https://kodza.dev/components/radio-component/

## Files

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

- [`kodza-radio-component.css`](https://kodza.dev/registry/radio-component/kodza-radio-component.css) · 10.9 KB
- [`kodza-radio-component.js`](https://kodza.dev/registry/radio-component/kodza-radio-component.js) · 5.4 KB
- [`kodza-radio-component.html`](https://kodza.dev/registry/radio-component/kodza-radio-component.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-radio-component.css https://kodza.dev/registry/radio-component/kodza-radio-component.css
curl -fsSL --create-dirs -o kodza/kodza-radio-component.js https://kodza.dev/registry/radio-component/kodza-radio-component.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-radio`
- Variables (set them on the root element itself: it declares its own defaults):
  - `--kz-radio-bg: #ffffff`
  - `--kz-radio-fg: #0a0a0a`
  - `--kz-radio-muted: rgba(10, 10, 10, 0.6)`
  - `--kz-radio-line: rgba(10, 10, 10, 0.2)`
  - `--kz-radio-soft: rgba(10, 10, 10, 0.06)`
  - `--kz-radio-ink: #0a0a0a`
  - `--kz-radio-size: 20px`
  - `--kz-radio-dot: 8px`
  - `--kz-radio-duration: 0.5s`
  - `--kz-radio-ease: cubic-bezier(0.22, 1, 0.36, 1)`
- Modifiers: `.kodza-radio--cards`
- 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.

- On an option (focus in `.kodza-radio__input`):
  - `ArrowDown` / `ArrowRight`: Picks the next option, round and round
  - `ArrowUp` / `ArrowLeft`: Picks the previous option, round and round

## 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-radio {
    --kz-radio-bg: #161616;
    --kz-radio-fg: #f2f2f0;
    --kz-radio-muted: rgba(242, 242, 240, 0.62);
    --kz-radio-line: rgba(255, 255, 255, 0.24);
    --kz-radio-soft: rgba(255, 255, 255, 0.07);
    --kz-radio-ink: #f2f2f0;
  }
}
```

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

## Use it

### Plain HTML page

- CSS: `kodza/kodza-radio-component.css` next to the page (the Files commands as they are), linked in `<head>`: `<link rel="stylesheet" href="kodza/kodza-radio-component.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-radio-component.js`, loaded with `<script src="kodza/kodza-radio-component.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. 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">`.
- 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$/{r kodza/kodza-radio-component.css' -e 'd' -e '}' -e '/^KODZA-JS$/{r kodza/kodza-radio-component.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">`.
- 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-radio-component', $uri . 'kodza-radio-component.css', [], filemtime($dir . 'kodza-radio-component.css'));
    wp_enqueue_script('kodza-radio-component', $uri . 'kodza-radio-component.js', [], filemtime($dir . 'kodza-radio-component.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-radio { --kz-radio-fg: var(TEXT, #0a0a0a); --kz-radio-bg: var(BACKGROUND, #ffffff); --kz-radio-ink: var(ACCENT, #0a0a0a); }`
  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-radio-component.css` and `assets/kodza-radio-component.js` (the Files commands with `-o assets/…`).
- In the section: `{{ 'kodza-radio-component.css' | asset_url | stylesheet_tag }}` and `<script src="{{ 'kodza-radio-component.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/`): `Radio.tsx` (below), the CSS block under Code saved as `radio-component.css` and the JS block as `radio-component.js`, both as they are. The HTML block is already inside the component: skip it.
- Use it: `import { Radio } from '@/components/kodza/Radio';` then `<Radio />`. Props: `variant` ("cards", or several in an array), `vars` (the `--kz-…` variables listed under API, e.g. `vars={{ '--kz-radio-bg': … }}`), `className`, `style` and the other props of its `<fieldset>` (`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 './radio-component.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.

```tsx
'use client';
// Kodza — Radio, for React. From https://kodza.dev/components/radio-component/
// 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: radio-component.css and radio-component.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.
import { useRef, useEffect, type ComponentPropsWithoutRef, type ComponentRef, type CSSProperties } from 'react';
import './radio-component.css';

type Variant = "cards";

export type RadioProps = Omit<ComponentPropsWithoutRef<'fieldset'>, "children" | "variant" | "vars"> & {
  /** Modifier class(es): .kodza-radio--cards */
  variant?: Variant | Variant[];
  /** Settings, as CSS variables on the root */
  vars?: {
    /** default: #ffffff */
    "--kz-radio-bg"?: string | number;
    /** default: #0a0a0a */
    "--kz-radio-fg"?: string | number;
    /** default: rgba(10, 10, 10, 0.6) */
    "--kz-radio-muted"?: string | number;
    /** default: rgba(10, 10, 10, 0.2) */
    "--kz-radio-line"?: string | number;
    /** default: rgba(10, 10, 10, 0.06) */
    "--kz-radio-soft"?: string | number;
    /** default: #0a0a0a */
    "--kz-radio-ink"?: string | number;
    /** default: 20px */
    "--kz-radio-size"?: string | number;
    /** default: 8px */
    "--kz-radio-dot"?: string | number;
    /** default: 0.5s */
    "--kz-radio-duration"?: string | number;
    /** default: cubic-bezier(0.22, 1, 0.36, 1) */
    "--kz-radio-ease"?: string | number;
  };
  className?: string;
};

export function Radio({ variant, vars, className, style, ...rest }: RadioProps) {
  const ref = useRef<ComponentRef<'fieldset'>>(null);
  const classes = ["kodza-radio", ...([] as string[]).concat(variant ?? []).map((v) => `kodza-radio--${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('./radio-component.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 (
    <fieldset key={key} {...rest} className={classes} style={{ ...vars, ...style } as CSSProperties} ref={ref}>
      <legend className="kodza-radio__legend">Shipping speed</legend>
      {' '}
      <label className="kodza-radio__item">
        <input className="kodza-radio__input" type="radio" name="speed" defaultValue="whenever" />
        {' '}
        <span className="kodza-radio__ring" aria-hidden="true" />
        {' '}
        <span className="kodza-radio__text">Whenever<small>We will get to it. Probably.</small></span>
      </label>
      {' '}
      <label className="kodza-radio__item">
        <input className="kodza-radio__input" type="radio" name="speed" defaultValue="week" defaultChecked />
        {' '}
        <span className="kodza-radio__ring" aria-hidden="true" />
        {' '}
        <span className="kodza-radio__text">This week<small>Two to three business days.</small></span>
      </label>
      {' '}
      <label className="kodza-radio__item">
        <input className="kodza-radio__input" type="radio" name="speed" defaultValue="yesterday" />
        {' '}
        <span className="kodza-radio__ring" aria-hidden="true" />
        {' '}
        <span className="kodza-radio__text">Yesterday<small>Physically impossible. We tried.</small></span>
      </label>
    </fieldset>
  );
}
```

## Code

```html
<fieldset class="kodza-radio">
  <legend class="kodza-radio__legend">Shipping speed</legend>
  <label class="kodza-radio__item">
    <input class="kodza-radio__input" type="radio" name="speed" value="whenever">
    <span class="kodza-radio__ring" aria-hidden="true"></span>
    <span class="kodza-radio__text">Whenever<small>We will get to it. Probably.</small></span>
  </label>
  <label class="kodza-radio__item">
    <input class="kodza-radio__input" type="radio" name="speed" value="week" checked>
    <span class="kodza-radio__ring" aria-hidden="true"></span>
    <span class="kodza-radio__text">This week<small>Two to three business days.</small></span>
  </label>
  <label class="kodza-radio__item">
    <input class="kodza-radio__input" type="radio" name="speed" value="yesterday">
    <span class="kodza-radio__ring" aria-hidden="true"></span>
    <span class="kodza-radio__text">Yesterday<small>Physically impossible. We tried.</small></span>
  </label>
</fieldset>

<fieldset class="kodza-radio kodza-radio--cards">
  <legend class="kodza-radio__legend">Framework</legend>
  <label class="kodza-radio__item">
    <input class="kodza-radio__input" type="radio" name="framework" value="none" checked>
    <span class="kodza-radio__ring" aria-hidden="true"></span>
    <span class="kodza-radio__text">None<small>Bold choice.</small></span>
  </label>
  <label class="kodza-radio__item">
    <input class="kodza-radio__input" type="radio" name="framework" value="vanilla">
    <span class="kodza-radio__ring" aria-hidden="true"></span>
    <span class="kodza-radio__text">Vanilla<small>Same thing.</small></span>
  </label>
  <label class="kodza-radio__item">
    <input class="kodza-radio__input" type="radio" name="framework" value="plain">
    <span class="kodza-radio__ring" aria-hidden="true"></span>
    <span class="kodza-radio__text">Plain JS<small>Still the same.</small></span>
  </label>
</fieldset>
```

```css
/* Kodza License: free to use, client work included. Not to resell or redistribute, ported or not: https://kodza.dev/docs/#print-license */
/* Kodza — Radio
   Real radio buttons, redrawn, with one dot for the whole group: pick another option and the
   dot travels to it, stretching on the way like a drop of ink, instead of one fading out and
   another fading in. With --cards, the options are cards in a row.
   Everything is tuned with the --kz-radio-* variables. */
.kodza-radio {
  --kz-radio-bg: #ffffff;
  --kz-radio-fg: #0a0a0a;
  --kz-radio-muted: rgba(10, 10, 10, 0.6);
  --kz-radio-line: rgba(10, 10, 10, 0.2);
  --kz-radio-soft: rgba(10, 10, 10, 0.06);
  --kz-radio-ink: #0a0a0a;
  --kz-radio-size: 20px;
  --kz-radio-dot: 8px;
  --kz-radio-duration: 0.5s;
  --kz-radio-ease: cubic-bezier(0.22, 1, 0.36, 1);

  position: relative;
  display: grid;
  gap: 4px;
  margin: 0;
  padding: 0;
  border: 0;
  color: var(--kz-radio-fg);
}

.kodza-radio__legend {
  margin-bottom: 10px;
  padding: 0;
  font-family: ui-monospace, "SF Mono", Menlo, monospace;
  font-size: 12px;
  color: var(--kz-radio-muted);
}

.kodza-radio__item {
  position: relative;
  display: flex;
  align-items: flex-start;
  gap: 12px;
  margin: 0 -10px;
  padding: 8px 10px;
  border-radius: 10px;
  cursor: pointer;
  transition: background-color 0.2s ease;
}

.kodza-radio__item:hover {
  background: var(--kz-radio-soft);
}

.kodza-radio__input {
  position: absolute;
  top: 8px;
  left: 10px;
  width: var(--kz-radio-size);
  height: var(--kz-radio-size);
  margin: 0;
  opacity: 0;
  cursor: inherit;
}

.kodza-radio__ring {
  flex: none;
  width: var(--kz-radio-size);
  height: var(--kz-radio-size);
  border-radius: 50%;
  background: var(--kz-radio-bg);
  box-shadow: inset 0 0 0 1.5px var(--kz-radio-line);
  transition: box-shadow 0.3s ease, transform 0.25s var(--kz-radio-ease);
}

.kodza-radio__item:hover .kodza-radio__ring {
  box-shadow: inset 0 0 0 1.5px var(--kz-radio-muted);
}

.kodza-radio__item:active .kodza-radio__ring {
  transform: scale(0.88);
}

.kodza-radio__input:checked + .kodza-radio__ring {
  box-shadow: inset 0 0 0 1.5px var(--kz-radio-ink);
}

/* The ring firms up when the dot lands, not when it leaves */
.kodza-radio.is-ready .kodza-radio__input:checked + .kodza-radio__ring {
  transition-delay: calc(var(--kz-radio-duration) * 0.6), 0s;
}

.kodza-radio__input:focus-visible + .kodza-radio__ring {
  outline: 2px solid var(--kz-radio-fg);
  outline-offset: 2px;
}

/* The one dot of the group (added by the script; without it, each ring shows its own) */
.kodza-radio__dot {
  position: absolute;
  top: 0;
  left: 0;
  width: var(--kz-radio-dot);
  height: var(--kz-radio-dot);
  border-radius: 999px;
  background: var(--kz-radio-ink);
  pointer-events: none;
  transform: translate(var(--kz-dot-x, 0), var(--kz-dot-y, 0));
}

.kodza-radio:not(.is-ready) .kodza-radio__input:checked + .kodza-radio__ring {
  box-shadow: inset 0 0 0 1.5px var(--kz-radio-ink), inset 0 0 0 6px var(--kz-radio-bg), inset 0 0 0 10px var(--kz-radio-ink);
}

.kodza-radio__text {
  display: grid;
  gap: 2px;
  padding-top: 1px;
  font-size: 15px;
  font-weight: 500;
  line-height: 1.25;
}

.kodza-radio__text small {
  font-size: 13px;
  font-weight: 400;
  line-height: 1.45;
  color: var(--kz-radio-muted);
}

.kodza-radio__item:has(.kodza-radio__input:disabled) {
  cursor: not-allowed;
  opacity: 0.45;
}

/* --cards: the options are cards in a row */
.kodza-radio--cards {
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 10px;
}

.kodza-radio--cards .kodza-radio__legend {
  float: left;
  width: 100%;
}

.kodza-radio--cards .kodza-radio__item {
  flex-direction: column;
  gap: 14px;
  margin: 0;
  padding: 16px;
  border-radius: 14px;
  background: var(--kz-radio-bg);
  box-shadow: inset 0 0 0 1px var(--kz-radio-line);
  transition: box-shadow 0.25s ease, transform 0.25s var(--kz-radio-ease);
}

.kodza-radio--cards .kodza-radio__item:hover {
  box-shadow: inset 0 0 0 1px var(--kz-radio-muted);
}

.kodza-radio--cards .kodza-radio__item:has(.kodza-radio__input:checked) {
  box-shadow: inset 0 0 0 1.5px var(--kz-radio-ink);
}

.kodza-radio--cards .kodza-radio__item:active {
  transform: scale(0.98);
}

.kodza-radio--cards .kodza-radio__input {
  top: 16px;
  left: 16px;
}

@media (prefers-reduced-motion: reduce) {
  .kodza-radio__item,
  .kodza-radio__ring {
    transition-duration: 0.01ms !important;
  }
}

/* Theming example — on a dark background:
.dark-section .kodza-radio {
  --kz-radio-bg: #161616;
  --kz-radio-fg: #f2f2f0;
  --kz-radio-muted: rgba(242, 242, 240, 0.62);
  --kz-radio-line: rgba(255, 255, 255, 0.24);
  --kz-radio-soft: rgba(255, 255, 255, 0.07);
  --kz-radio-ink: #f2f2f0;
}
*/

/* kodza-guard d876e7f568bf — 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-radio__legend):not(#_) {
  float: revert;
}

:where(.kodza-radio__item):not(#_) {
  background-color: revert;
  background-image: revert;
  box-shadow: revert;
}

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

.kodza-radio:not(#_) {
  border-radius: revert;
  outline: revert;
  text-decoration: revert;
  transition: revert;
  list-style: revert;
  box-sizing: 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-radio__legend:not(#_) {
  border: revert;
  border-radius: revert;
  outline: revert;
  text-decoration: revert;
  transition: revert;
  list-style: revert;
  box-sizing: revert;
  position: revert;
  margin-top: revert;
  margin-right: revert;
  margin-left: 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;
  white-space: revert;
}

.kodza-radio__item:not(#_) {
  border: revert;
  outline: revert;
  text-decoration: revert;
  list-style: revert;
  box-sizing: revert;
  float: 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-radio__input:not(#_) {
  border: revert;
  padding: revert;
  border-radius: 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-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;
  white-space: revert;
  min-height: revert;
}

.kodza-radio__ring:not(#_),
.kodza-radio__text:not(#_),
.kodza-radio__dot:not(#_) {
  box-sizing: revert;
}

.kodza-radio__text small: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-family: 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-radio__legend:not(#_):where(:not([hidden])),
.kodza-radio__input:not(#_):where(:not([hidden])),
.kodza-radio__text small:where(:not([class*="kodza-"])):not(#_):where(:not([hidden])) {
  display: revert;
}

.kodza-radio__legend:not(#_):where([hidden]),
.kodza-radio__input:not(#_):where([hidden]),
.kodza-radio__text small:where(:not([class*="kodza-"])):not(#_):where([hidden]) {
  display: none;
}

/* 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-radio:not(#_) {
  position: relative;
  display: grid;
  padding: 0;
  border: 0;
  color: var(--kz-radio-fg);
}

.kodza-radio__legend:not(#_) {
  margin-bottom: 10px;
  padding: 0;
  font-family: ui-monospace, "SF Mono", Menlo, monospace;
  font-size: 12px;
  color: var(--kz-radio-muted);
}

.kodza-radio__item:not(#_) {
  position: relative;
  display: flex;
  margin: 0 -10px;
  padding: 8px 10px;
  border-radius: 10px;
  transition: background-color 0.2s ease;
}

.kodza-radio__item:hover:not(#_) {
  background: var(--kz-radio-soft);
}

.kodza-radio__input:not(#_) {
  position: absolute;
  top: 8px;
  left: 10px;
  width: var(--kz-radio-size);
  height: var(--kz-radio-size);
  margin: 0;
  opacity: 0;
  cursor: inherit;
}

.kodza-radio__text small:not(#_) {
  font-size: 13px;
  font-weight: 400;
  line-height: 1.45;
  color: var(--kz-radio-muted);
}

.kodza-radio--cards .kodza-radio__legend:not(#_) {
  float: left;
}

.kodza-radio--cards .kodza-radio__item:not(#_) {
  margin: 0;
  padding: 16px;
  border-radius: 14px;
  background: var(--kz-radio-bg);
  box-shadow: inset 0 0 0 1px var(--kz-radio-line);
  transition: box-shadow 0.25s ease, transform 0.25s var(--kz-radio-ease);
}

.kodza-radio--cards .kodza-radio__item:hover:not(#_) {
  box-shadow: inset 0 0 0 1px var(--kz-radio-muted);
}

.kodza-radio--cards .kodza-radio__item:has(.kodza-radio__input:checked):not(#_) {
  box-shadow: inset 0 0 0 1.5px var(--kz-radio-ink);
}

.kodza-radio--cards .kodza-radio__input:not(#_) {
  top: 16px;
  left: 16px;
}

@media (prefers-reduced-motion: reduce) {
  .kodza-radio__item:not(#_) {
    transition-duration: 0.01ms !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 — Radio
// Adds the group's one dot and moves it to the checked ring: it travels along the line between
// the two rings and stretches in that direction on the way, then settles. Follows keyboard
// arrows as well as clicks, and resizes.
(() => {
  const SELECTOR = '.kodza-radio';
  const reduceMotion = window.matchMedia('(prefers-reduced-motion: reduce)').matches;

  // One instance. Everything it starts is tied to `signal`, so kodza:destroy stops it all
  function mount(root, signal) {
    const inputs = [...root.querySelectorAll('.kodza-radio__input')];
    if (!inputs.length) return;
    const dot = document.createElement('span');
    dot.className = 'kodza-radio__dot';
    dot.setAttribute('aria-hidden', 'true');
    root.append(dot);
    const style = getComputedStyle(root);
    const duration = parseFloat(style.getPropertyValue('--kz-radio-duration')) * 1000 || 500;

    // Where the dot sits for a ring: measured from the dot's own resting place (a fieldset's
    // legend shifts what "top: 0" means, so the group's box cannot be trusted). Screen pixels are
    // divided by the group's scale, in case a parent is scaled with a transform.
    const origin = () => {
      dot.style.setProperty('--kz-dot-x', '0px');
      dot.style.setProperty('--kz-dot-y', '0px');
      const r = dot.getBoundingClientRect();
      return { x: r.left, y: r.top, scale: root.getBoundingClientRect().width / root.offsetWidth || 1 };
    };
    const spot = (input, o) => {
      const a = input.nextElementSibling.getBoundingClientRect();
      return { x: (a.left - o.x + a.width / 2) / o.scale - dot.offsetWidth / 2, y: (a.top - o.y + a.height / 2) / o.scale - dot.offsetHeight / 2 };
    };

    let current = null;
    const move = (animate) => {
      const checked = inputs.find((input) => input.checked);
      if (!checked) {
        dot.style.opacity = '0';
        current = null;
        return;
      }
      dot.getAnimations().forEach((animation) => animation.cancel());
      const o = origin();
      const to = spot(checked, o);
      dot.style.setProperty('--kz-dot-x', `${to.x}px`);
      dot.style.setProperty('--kz-dot-y', `${to.y}px`);
      if (animate && current && current !== checked && !reduceMotion) {
        const from = spot(current, o);
        const dx = to.x - from.x;
        const dy = to.y - from.y;
        const angle = Math.atan2(dy, dx) * (180 / Math.PI);
        const stretch = Math.min(4, 1 + Math.hypot(dx, dy) / 40);
        // The dot leaves, stretches along its path, and lands
        dot.animate([
          { transform: `translate(${from.x}px, ${from.y}px) rotate(${angle}deg) scaleX(1)` },
          { transform: `translate(${from.x + dx * 0.5}px, ${from.y + dy * 0.5}px) rotate(${angle}deg) scaleX(${stretch}) scaleY(0.7)`, offset: 0.45 },
          { transform: `translate(${to.x}px, ${to.y}px) rotate(${angle}deg) scaleX(0.85) scaleY(1.1)`, offset: 0.8 },
          { transform: `translate(${to.x}px, ${to.y}px) rotate(${angle}deg) scaleX(1)` },
        ], { duration, easing: 'cubic-bezier(0.65, 0, 0.35, 1)' });
      } else if (animate && !current && !reduceMotion) {
        dot.animate([{ transform: `translate(${to.x}px, ${to.y}px) scale(0)` }, { transform: `translate(${to.x}px, ${to.y}px) scale(1)` }], { duration: 300, easing: 'cubic-bezier(0.34, 1.56, 0.64, 1)' });
      }
      dot.style.opacity = '1';
      current = checked;
    };

    inputs.forEach((input) => input.addEventListener('change', () => move(true), { signal }));
    const observer = new ResizeObserver(() => move(false));
    observer.observe(root);
    signal.addEventListener('abort', () => observer.disconnect());
    document.fonts?.ready.then(() => move(false));
    root.classList.add('is-ready');
    move(false);
  }

  // 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.
  const instances = new WeakMap();
  const find = (scope = document) => [scope, ...scope.querySelectorAll(SELECTOR)].filter((el) => el.matches?.(SELECTOR));
  const init = (scope) => find(scope).forEach((root) => {
    if (root.classList.contains('is-ready')) return; // already running, maybe from another copy of this script
    const controller = new AbortController();
    instances.set(root, { controller, html: root.innerHTML, attrs: [...root.attributes].map((a) => [a.name, a.value]) });
    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.controller.abort();
    [...root.attributes].forEach((a) => root.removeAttribute(a.name));
    instance.attrs.forEach(([name, value]) => root.setAttribute(name, value));
    root.innerHTML = instance.html;
  });
  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).