Scramble Link

<div class="kodza-scramble-list">
  <a class="kodza-scramble" href="#">Read the docs</a>
  <a class="kodza-scramble" href="#" data-scramble="shuffle">See the changelog</a>
  <a class="kodza-scramble" href="#" data-scramble="flap">Talk to a human</a>
</div>

/* Kodza License: free to use, client work included. Not to resell or redistribute, ported or not: https://kodza.dev/docs/#print-license */
/* Kodza — Scramble Link
   On hover the word scrambles, then settles back letter by letter, from left to right.
   Three ways to scramble, picked with data-scramble:
     (default)  symbols that decode into the word
     "shuffle"  the word's own letters, mixed like an anagram, finding their place again
     "flap"     a split-flap board: each letter rolls through the alphabet up to its own
   Each letter keeps its width, so the layout never twitches.
   Wrap the list in a nav element with an aria-label when it is your site navigation.
   Everything is tuned with the --kz-scramble-* variables. */
.kodza-scramble-list {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 6px;
}

.kodza-scramble {
  --kz-scramble-muted: rgba(10, 10, 10, 0.4);
  --kz-scramble-duration: 0.6s;

  position: relative;
  color: inherit;
  text-decoration: none;
  white-space: nowrap;
}

.kodza-scramble__text {
  display: inline-flex;
}

.kodza-scramble__letter {
  display: inline-block;
  white-space: pre;
  text-align: center;
}

/* Letters still searching for themselves are dimmed */
.kodza-scramble__letter.is-scrambled {
  color: var(--kz-scramble-muted);
}

.kodza-scramble__sr {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

.kodza-scramble:focus-visible {
  outline: 2px solid currentColor;
  outline-offset: 4px;
  border-radius: 2px;
}

/* Theming example — on a dark background:
.dark-section .kodza-scramble {
  --kz-scramble-muted: rgba(255, 255, 255, 0.4);
}
*/

/* kodza-guard 46041a255f07 — 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-scramble):not(#_) {
  border-radius: revert;
  outline: revert;
  outline-offset: revert;
}

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

.kodza-scramble:not(#_) {
  border: revert;
  padding: revert;
  transition: revert;
  list-style: revert;
  box-sizing: revert;
  background-color: revert;
  background-image: revert;
  box-shadow: 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-scramble__text:not(#_),
.kodza-scramble__letter:not(#_),
.kodza-scramble__sr:not(#_) {
  box-sizing: revert;
}

.kodza-scramble:not(#_):where(:not([hidden])) {
  display: revert;
}

.kodza-scramble: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-scramble:not(#_) {
  position: relative;
  color: inherit;
  text-decoration: none;
}

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

// Kodza License: free to use, client work included. Not to resell or redistribute, ported or not: https://kodza.dev/docs/#print-license
// Kodza — Scramble Link
// Splits each link into letters with a fixed width, then on hover (or keyboard focus)
// scrambles them and lets them settle back one by one, from left to right.
// data-scramble picks the style: symbols (default), "shuffle" or "flap".
// Nothing moves for visitors who asked for reduced motion.
(() => {
  const SELECTOR = '.kodza-scramble';
  const SYMBOLS = '!<>-_\\/[]{}=+*^?#%&01';
  const ALPHABET = 'abcdefghijklmnopqrstuvwxyz';
  const SWAP_EVERY = 45; // a new character every ~45 ms, not every frame
  const reduceMotion = window.matchMedia('(prefers-reduced-motion: reduce)').matches;
  const pick = (list) => list[Math.floor(Math.random() * list.length)];

  // What an unsettled letter shows, for each style
  const STYLES = {
    // Any symbol
    symbols: () => pick(SYMBOLS),
    // One of the word's own letters that has not found its place yet
    shuffle: (state) => pick(state.pool.length ? state.pool : state.chars),
    // The next letter of the alphabet: it starts just enough steps back to land
    // exactly on its own letter at the moment it settles
    flap: (state, i) => {
      const target = state.chars[i];
      const lower = target.toLowerCase();
      const index = ALPHABET.indexOf(lower);
      if (index < 0) return target;
      if (state.flap[i] === undefined) {
        const steps = Math.max(1, Math.round(state.settleAt(i) / SWAP_EVERY));
        state.flap[i] = (index - steps + 52) % 26;
      } else {
        state.flap[i] = (state.flap[i] + 1) % 26;
      }
      const char = ALPHABET[state.flap[i]];
      return target === lower ? char : char.toUpperCase();
    },
  };

  // One instance. Everything it starts is tied to `signal`, so kodza:destroy stops it all
  function mount(link, signal) {
    const chars = [...link.textContent.trim()];
    const style = STYLES[link.dataset.scramble] || STYLES.symbols;
    const duration = parseFloat(getComputedStyle(link).getPropertyValue('--kz-scramble-duration')) * 1000 || 600;

    const text = document.createElement('span');
    text.className = 'kodza-scramble__text';
    text.setAttribute('aria-hidden', 'true');
    const letters = chars.map((char) => {
      const letter = document.createElement('span');
      letter.className = 'kodza-scramble__letter';
      letter.textContent = char;
      text.append(letter);
      return letter;
    });
    const sr = document.createElement('span');
    sr.className = 'kodza-scramble__sr';
    sr.textContent = chars.join('');
    link.replaceChildren(text, sr);

    // Each letter keeps the width of its real character, whatever it shows
    document.fonts.ready.then(() => {
      letters.forEach((letter) => (letter.style.width = `${letter.getBoundingClientRect().width}px`));
    });

    let frame = null;
    const scramble = () => {
      if (reduceMotion) return;
      cancelAnimationFrame(frame);
      // When each letter settles (in ms): left to right, the first ones almost at once
      const settleAt = (i) => duration * (0.2 + 0.8 * (i / chars.length));
      const state = { chars, pool: [], flap: [], settleAt };
      const start = performance.now();
      let lastSwap = 0;
      const tick = (now) => {
        if (signal.aborted) return;
        const progress = (now - start) / duration;
        const swap = now - lastSwap > SWAP_EVERY;
        if (swap) lastSwap = now;
        const settled = chars.map((char, i) => char === ' ' || now - start >= settleAt(i));
        state.pool = chars.filter((char, i) => !settled[i]);
        letters.forEach((letter, i) => {
          if (settled[i]) letter.textContent = chars[i];
          else if (swap) letter.textContent = style(state, i);
          letter.classList.toggle('is-scrambled', !settled[i]);
        });
        if (progress < 1) frame = requestAnimationFrame(tick);
      };
      frame = requestAnimationFrame(tick);
    };

    link.addEventListener('pointerenter', scramble, { signal });
    link.addEventListener('focus', () => link.matches(':focus-visible') && scramble(), { 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 — Scramble Link, for React. From https://kodza.dev/components/hover-link-text-shuffle/
// 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: hover-link-text-shuffle.css and hover-link-text-shuffle.js, the component's CSS and JS from Kodza, as they are.
// Yours to edit: the markup is plain JSX below.
// In Kodza's markup it sits in a <div class="kodza-scramble-list">, which the CSS uses too:
// put yours in one for the same result.
// 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 './hover-link-text-shuffle.css';

export type ScrambleLinkProps = Omit<ComponentPropsWithoutRef<'a'>, "children" | "vars" | "scramble"> & {
  /** data-scramble on the root */
  scramble?: "shuffle" | "flap";
  /** Settings, as CSS variables on the root */
  vars?: {
    /** default: rgba(10, 10, 10, 0.4) */
    "--kz-scramble-muted"?: string | number;
    /** default: 0.6s */
    "--kz-scramble-duration"?: string | number;
  };
  /** The text, plain: the script reads it and rebuilds the markup around it */
  children?: string;
  className?: string;
};

export function ScrambleLink({ scramble, vars, children = "Read the docs", className, style, ...rest }: ScrambleLinkProps) {
  const ref = useRef<ComponentRef<'a'>>(null);
  const classes = ["kodza-scramble", 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, scramble, vars, children, 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('./hover-link-text-shuffle.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} data-scramble={scramble} style={{ ...vars, ...style } as CSSProperties} ref={ref}>{children}</a>
  );
}