Image Hover

<a class="kodza-image-hover" href="#">
  <img src="https://kodza.dev/media/kz-block-1400.webp" alt="A tall concrete slab standing alone, its long shadow stretching toward the viewer" loading="lazy" />
</a>

<a class="kodza-image-hover kodza-image-hover--focus" href="#">
  <img src="https://kodza.dev/media/kz-columns-1400.webp" alt="A row of square concrete pillars under a flat roof, casting striped shadows" loading="lazy" />
</a>

<a class="kodza-image-hover kodza-image-hover--round" href="#">
  <img src="https://kodza.dev/media/kz-arch-1400.webp" alt="A concrete wall with a round-topped opening, sunlight pouring through it onto the ground" loading="lazy" />
</a>

<a class="kodza-image-hover kodza-image-hover--parallax" href="#">
  <img src="https://kodza.dev/media/kz-stack-1400.webp" alt="Three concrete slabs stacked at slightly different angles" loading="lazy" />
</a>

/* Kodza License: free to use, client work included. Not to resell or redistribute, ported or not: https://kodza.dev/docs/#print-license */
/* Kodza — Image Hover
   Four ways for an image to answer the pointer, always inside its own frame:
     (default)   a slow zoom
     --focus     soft at rest, it comes into focus
     --round     the corners round off and the frame draws in a little
     --parallax  the image drifts with the pointer (with the small script)
   Everything is tuned with the --kz-image-* variables. */
.kodza-image-hover {
  --kz-image-ratio: 4 / 5;
  --kz-image-radius: 4px;
  --kz-image-zoom: 1.08;
  --kz-image-duration: 1.1s;
  --kz-image-ease: cubic-bezier(0.22, 1, 0.36, 1);
  --kz-image-placeholder: rgba(10, 10, 10, 0.06);

  position: relative;
  display: block;
  aspect-ratio: var(--kz-image-ratio);
  overflow: hidden;
  border-radius: var(--kz-image-radius);
  background: var(--kz-image-placeholder);
  clip-path: inset(0 round var(--kz-image-radius));
  transition: clip-path var(--kz-image-duration) var(--kz-image-ease);
}

.kodza-image-hover img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transform: scale(1.001);
  transition: transform var(--kz-image-duration) var(--kz-image-ease), filter var(--kz-image-duration) var(--kz-image-ease);
}

.kodza-image-hover:hover img,
.kodza-image-hover:focus-visible img {
  transform: scale(var(--kz-image-zoom));
}

.kodza-image-hover:focus-visible {
  outline: 2px solid currentColor;
  outline-offset: 4px;
}

/* Focus: blurred and slightly enlarged at rest, sharp under the pointer */
.kodza-image-hover--focus img {
  filter: blur(8px);
  transform: scale(1.06);
}

.kodza-image-hover--focus:hover img,
.kodza-image-hover--focus:focus-visible img {
  filter: none;
  transform: scale(1);
}

/* Round: the frame draws in and its corners round off */
.kodza-image-hover--round:hover,
.kodza-image-hover--round:focus-visible {
  clip-path: inset(4% round 34%);
}

.kodza-image-hover--round:hover img,
.kodza-image-hover--round:focus-visible img {
  transform: scale(1.02);
}

/* Parallax: the image is a little larger than its frame and follows the pointer */
.kodza-image-hover--parallax img {
  transform: scale(1.14) translate(calc(var(--kz-x, 0) * -4%), calc(var(--kz-y, 0) * -4%));
  transition-duration: 0.7s;
}

.kodza-image-hover--parallax:hover img,
.kodza-image-hover--parallax:focus-visible img {
  transform: scale(1.14) translate(calc(var(--kz-x, 0) * -4%), calc(var(--kz-y, 0) * -4%));
}

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

  .kodza-image-hover--parallax img {
    transform: scale(1.14) !important;
  }
}

/* kodza-guard 6bf4c085e98c — generated by Kodza, do not edit.
   Theme guard: keeps a site's own CSS (WordPress themes, Bootstrap, CSS resets…) off this
   component. :not(#_) is always true and weighs as much as an id, so these lines win over
   theme rules made of classes and tags. Customise the component through its --kz-* variables. */

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

:where(.kodza-image-hover):not(#_) {
  outline: revert;
  outline-offset: revert;
}

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

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

.kodza-image-hover img:where(:not([class*="kodza-"])):not(#_) {
  border: revert;
  margin: revert;
  padding: revert;
  border-radius: revert;
  outline: revert;
  text-decoration: 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;
}

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

.kodza-image-hover:not(#_) {
  position: relative;
  display: block;
  border-radius: var(--kz-image-radius);
  background: var(--kz-image-placeholder);
  transition: clip-path var(--kz-image-duration) var(--kz-image-ease);
}

.kodza-image-hover img:not(#_) {
  display: block;
  transition: transform var(--kz-image-duration) var(--kz-image-ease), filter var(--kz-image-duration) var(--kz-image-ease);
}

.kodza-image-hover:focus-visible:not(#_) {
  outline: 2px solid currentColor;
  outline-offset: 4px;
}

.kodza-image-hover--parallax img:not(#_) {
  transition-duration: 0.7s;
}

@media (prefers-reduced-motion: reduce) {
  .kodza-image-hover:not(#_),
  .kodza-image-hover img:not(#_) {
    transition-duration: 0.01ms !important;
  }
}

// Kodza License: free to use, client work included. Not to resell or redistribute, ported or not: https://kodza.dev/docs/#print-license
// Kodza — Image Hover
// Only needed for the --parallax variant: gives the image the pointer's position
// in its frame (-1 to 1 on each axis), and sends it back to the centre on leave.
(() => {
  const SELECTOR = '.kodza-image-hover--parallax';
  // One instance. Everything it starts is tied to `signal`, so kodza:destroy stops it all
  function mount(frame, signal) {
    frame.addEventListener('pointermove', (event) => {
      const rect = frame.getBoundingClientRect();
      frame.style.setProperty('--kz-x', (((event.clientX - rect.left) / rect.width) * 2 - 1).toFixed(3));
      frame.style.setProperty('--kz-y', (((event.clientY - rect.top) / rect.height) * 2 - 1).toFixed(3));
    }, { signal });
    frame.addEventListener('pointerleave', () => {
      frame.style.setProperty('--kz-x', 0);
      frame.style.setProperty('--kz-y', 0);
    }, { signal });
  }

  // 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 });
})();

'use client';
// Kodza — Image Hover, for React. From https://kodza.dev/components/image-scale/
// Kodza License: free to use, client work included. Not to resell or redistribute, ported or not: https://kodza.dev/docs/#print-license
// Next to this file: image-scale.css and image-scale.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 './image-scale.css';

type Variant = "focus" | "parallax" | "round";

export type ImageHoverProps = Omit<ComponentPropsWithoutRef<'a'>, "children" | "variant" | "vars"> & {
  /** Modifier class(es): .kodza-image-hover--focus, .kodza-image-hover--parallax, .kodza-image-hover--round (default: parallax, the one the script runs on; [] for none) */
  variant?: Variant | Variant[];
  /** Settings, as CSS variables on the root */
  vars?: {
    /** default: 4 / 5 */
    "--kz-image-ratio"?: string | number;
    /** default: 4px */
    "--kz-image-radius"?: string | number;
    /** default: 1.08 */
    "--kz-image-zoom"?: string | number;
    /** default: 1.1s */
    "--kz-image-duration"?: string | number;
    /** default: cubic-bezier(0.22, 1, 0.36, 1) */
    "--kz-image-ease"?: string | number;
    /** default: rgba(10, 10, 10, 0.06) */
    "--kz-image-placeholder"?: string | number;
  };
  className?: string;
};

export function ImageHover({ variant = "parallax", vars, className, style, ...rest }: ImageHoverProps) {
  const ref = useRef<ComponentRef<'a'>>(null);
  const classes = ["kodza-image-hover", ...([] as string[]).concat(variant ?? []).map((v) => `kodza-image-hover--${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('./image-scale.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 (
    <a href="#" key={key} {...rest} className={classes} style={{ ...vars, ...style } as CSSProperties} ref={ref}>
      <img src="https://kodza.dev/media/kz-stack-1400.webp" alt="Three concrete slabs stacked at slightly different angles" loading="lazy" />
    </a>
  );
}