Sticky Cards

<div class="kodza-stack">
  <article class="kodza-stack__card">
    <div class="kodza-stack__media"><img src="https://kodza.dev/media/kz-steps-2400.webp" alt="A concrete staircase that climbs nine steps and stops in mid-air" loading="lazy" /></div>
    <div class="kodza-stack__body">
      <p class="kodza-stack__index">01</p>
      <h3 class="kodza-stack__title">Copy</h3>
      <p class="kodza-stack__text">Find the effect, open the code, take what you need. No account, no paywall.</p>
    </div>
  </article>
  <article class="kodza-stack__card">
    <div class="kodza-stack__media"><img src="https://kodza.dev/media/kz-block-2400.webp" alt="A tall concrete slab standing alone, its long shadow stretching toward the viewer" loading="lazy" /></div>
    <div class="kodza-stack__body">
      <p class="kodza-stack__index">02</p>
      <h3 class="kodza-stack__title">Paste</h3>
      <p class="kodza-stack__text">One HTML block, one CSS file, a few lines of JS. It drops into any page or theme.</p>
    </div>
  </article>
  <article class="kodza-stack__card">
    <div class="kodza-stack__media"><img src="https://kodza.dev/media/kz-columns-2400.webp" alt="A row of square concrete pillars under a flat roof, casting striped shadows" loading="lazy" /></div>
    <div class="kodza-stack__body">
      <p class="kodza-stack__index">03</p>
      <h3 class="kodza-stack__title">Tweak</h3>
      <p class="kodza-stack__text">Colors, sizes and timings are CSS variables. Make it yours in thirty seconds.</p>
    </div>
  </article>
  <article class="kodza-stack__card">
    <div class="kodza-stack__media"><img src="https://kodza.dev/media/kz-float-2400.webp" alt="A concrete block hovering above the ground, over its own shadow" loading="lazy" /></div>
    <div class="kodza-stack__body">
      <p class="kodza-stack__index">04</p>
      <h3 class="kodza-stack__title">Ship</h3>
      <p class="kodza-stack__text">Push it live, close the laptop, and go home early.</p>
    </div>
  </article>
</div>

/* Kodza License: free to use, client work included. Not to resell or redistribute, ported or not: https://kodza.dev/docs/#print-license */
/* Kodza — Sticky Cards
   Cards that stack as you scroll: each one sticks a little below the previous, and the card
   being covered steps back and darkens. The stacking is plain CSS (position: sticky); the
   script only measures how much each card is covered.
   Everything is tuned with the --kz-stack-* variables. */
.kodza-stack {
  --kz-stack-bg: #ffffff;
  --kz-stack-fg: #0a0a0a;
  --kz-stack-muted: rgba(10, 10, 10, 0.62);
  --kz-stack-border: rgba(10, 10, 10, 0.1);
  --kz-stack-shade: #0a0a0a;
  --kz-stack-top: 10vh;
  --kz-stack-offset: 18px;
  --kz-stack-height: 72vh;
  --kz-stack-gap: 12vh;
  --kz-stack-scale: 0.08;
  --kz-stack-radius: 16px;
  --kz-stack-pad: 28px;

  display: grid;
  gap: var(--kz-stack-gap);
  padding-bottom: var(--kz-stack-gap);
}

.kodza-stack__card {
  position: sticky;
  top: calc(var(--kz-stack-top) + var(--i, 0) * var(--kz-stack-offset));
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
  height: var(--kz-stack-height);
  overflow: hidden;
  border-radius: var(--kz-stack-radius);
  background: var(--kz-stack-bg);
  box-shadow: inset 0 0 0 1px var(--kz-stack-border);
  color: var(--kz-stack-fg);
  transform: scale(calc(1 - var(--p, 0) * var(--kz-stack-scale)));
  transform-origin: 50% 0;
}

/* The shade that darkens a card as the next one covers it */
.kodza-stack__card::after {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--kz-stack-shade);
  opacity: calc(var(--p, 0) * 0.45);
  pointer-events: none;
}

.kodza-stack__media {
  overflow: hidden;
}

.kodza-stack__media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.kodza-stack__body {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: var(--kz-stack-pad);
}

.kodza-stack__index {
  margin: 0 0 auto;
  font-family: ui-monospace, "SF Mono", Menlo, monospace;
  font-size: 12px;
  color: var(--kz-stack-muted);
}

.kodza-stack__title {
  margin: 0;
  font-size: 22px;
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.kodza-stack__text {
  max-width: 34ch;
  margin: 0;
  font-size: 15px;
  line-height: 1.55;
  color: var(--kz-stack-muted);
}

@media (max-width: 720px) {
  .kodza-stack__card {
    grid-template-columns: minmax(0, 1fr);
    grid-template-rows: minmax(0, 1fr) auto;
  }
}

@media (prefers-reduced-motion: reduce) {
  .kodza-stack__card {
    transform: none;
  }

  .kodza-stack__card::after {
    opacity: 0;
  }
}

/* Theming example — on a dark background:
.dark-section .kodza-stack {
  --kz-stack-bg: #161616;
  --kz-stack-fg: #f2f2f0;
  --kz-stack-muted: rgba(242, 242, 240, 0.62);
  --kz-stack-border: rgba(255, 255, 255, 0.12);
  --kz-stack-shade: #000000;
}
*/

/* kodza-guard 88f52bb515aa — 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, on everything the component leaves to it */

.kodza-stack:not(#_),
.kodza-stack__media:not(#_),
.kodza-stack__body:not(#_) {
  box-sizing: revert;
}

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

.kodza-stack__media img: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-stack__index:not(#_):where(:not([hidden])),
.kodza-stack__title:not(#_):where(:not([hidden])),
.kodza-stack__text:not(#_):where(:not([hidden])) {
  display: revert;
}

.kodza-stack__index:not(#_):where([hidden]),
.kodza-stack__title:not(#_):where([hidden]),
.kodza-stack__text:not(#_):where([hidden]) {
  display: none;
}

.kodza-stack__card:not(#_)::after {
  box-sizing: revert;
}

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

.kodza-stack__card:not(#_) {
  position: sticky;
  display: grid;
  border-radius: var(--kz-stack-radius);
  background: var(--kz-stack-bg);
  box-shadow: inset 0 0 0 1px var(--kz-stack-border);
  color: var(--kz-stack-fg);
}

.kodza-stack__media img:not(#_) {
  display: block;
}

.kodza-stack__index:not(#_) {
  margin: 0 0 auto;
  font-family: ui-monospace, "SF Mono", Menlo, monospace;
  font-size: 12px;
  color: var(--kz-stack-muted);
}

.kodza-stack__title:not(#_) {
  margin: 0;
  font-size: 22px;
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.kodza-stack__text:not(#_) {
  max-width: 34ch;
  margin: 0;
  font-size: 15px;
  line-height: 1.55;
  color: var(--kz-stack-muted);
}

// Kodza License: free to use, client work included. Not to resell or redistribute, ported or not: https://kodza.dev/docs/#print-license
// Kodza — Sticky Cards
// Gives each card its place in the stack (--i) and, while the stack is on screen, how much
// the next card covers it (--p, 0 to 1). The stacking itself is position: sticky.
(() => {
  const SELECTOR = '.kodza-stack';
  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) {
    if (reduceMotion) return;
    const cards = [...root.querySelectorAll('.kodza-stack__card')];
    cards.forEach((card, i) => card.style.setProperty('--i', i));

    let visible = false;
    let ticking = false;
    const update = () => {
      ticking = false;
      if (!visible) return;
      cards.forEach((card, i) => {
        const next = cards[i + 1];
        if (!next) return;
        const a = card.getBoundingClientRect();
        const b = next.getBoundingClientRect();
        // 0 while the next card is still a card's height below, 1 once it sits on top
        const p = Math.min(1, Math.max(0, 1 - (b.top - a.top) / a.height));
        card.style.setProperty('--p', p.toFixed(3));
      });
    };
    const request = () => {
      if (!ticking) {
        ticking = true;
        requestAnimationFrame(update);
      }
    };

    const observer = new IntersectionObserver(([entry]) => {
      visible = entry.isIntersecting;
      request();
    });
    observer.observe(root);
    signal.addEventListener('abort', () => observer.disconnect());
    window.addEventListener('scroll', request, { passive: true, signal });
    window.addEventListener('resize', request, { 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 — Sticky Cards, for React. From https://kodza.dev/components/sticky-cards/
// Kodza License: free to use, client work included. Not to resell or redistribute, ported or not: https://kodza.dev/docs/#print-license
// Next to this file: sticky-cards.css and sticky-cards.js, the component's CSS and JS from Kodza, as they are.
// Yours to edit: the markup is plain JSX below.
// The script changes this markup once React has rendered it (it adds layers, splits text, moves
// nodes), so React must not patch it afterwards. When a prop changes, the key gives React a fresh
// element: kodza:destroy stops the script on the old one, kodza:init starts it on the new one.
import { useRef, useEffect, type ComponentPropsWithoutRef, type ComponentRef, type CSSProperties } from 'react';
import './sticky-cards.css';

export type StickyCardsProps = Omit<ComponentPropsWithoutRef<'div'>, "children" | "vars"> & {
  /** Settings, as CSS variables on the root */
  vars?: {
    /** default: #ffffff */
    "--kz-stack-bg"?: string | number;
    /** default: #0a0a0a */
    "--kz-stack-fg"?: string | number;
    /** default: rgba(10, 10, 10, 0.62) */
    "--kz-stack-muted"?: string | number;
    /** default: rgba(10, 10, 10, 0.1) */
    "--kz-stack-border"?: string | number;
    /** default: #0a0a0a */
    "--kz-stack-shade"?: string | number;
    /** default: 10vh */
    "--kz-stack-top"?: string | number;
    /** default: 18px */
    "--kz-stack-offset"?: string | number;
    /** default: 72vh */
    "--kz-stack-height"?: string | number;
    /** default: 12vh */
    "--kz-stack-gap"?: string | number;
    /** default: 0.08 */
    "--kz-stack-scale"?: string | number;
    /** default: 16px */
    "--kz-stack-radius"?: string | number;
    /** default: 28px */
    "--kz-stack-pad"?: string | number;
  };
  className?: string;
};

export function StickyCards({ vars, className, style, ...rest }: StickyCardsProps) {
  const ref = useRef<ComponentRef<'div'>>(null);
  const classes = ["kodza-stack", 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('./sticky-cards.js').then(() => {
      if (live) document.dispatchEvent(new CustomEvent('kodza:init', { detail: { root } }));
    });
    return () => {
      live = false;
      document.dispatchEvent(new CustomEvent('kodza:destroy', { detail: { root } }));
    };
  }, [key]);

  return (
    <div key={key} {...rest} className={classes} style={{ ...vars, ...style } as CSSProperties} ref={ref}>
      <article className="kodza-stack__card">
        <div className="kodza-stack__media">
          <img src="https://kodza.dev/media/kz-steps-2400.webp" alt="A concrete staircase that climbs nine steps and stops in mid-air" loading="lazy" />
        </div>
        <div className="kodza-stack__body">
          <p className="kodza-stack__index">01</p>
          <h3 className="kodza-stack__title">Copy</h3>
          <p className="kodza-stack__text">Find the effect, open the code, take what you need. No account, no paywall.</p>
        </div>
      </article>
      <article className="kodza-stack__card">
        <div className="kodza-stack__media">
          <img src="https://kodza.dev/media/kz-block-2400.webp" alt="A tall concrete slab standing alone, its long shadow stretching toward the viewer" loading="lazy" />
        </div>
        <div className="kodza-stack__body">
          <p className="kodza-stack__index">02</p>
          <h3 className="kodza-stack__title">Paste</h3>
          <p className="kodza-stack__text">One HTML block, one CSS file, a few lines of JS. It drops into any page or theme.</p>
        </div>
      </article>
      <article className="kodza-stack__card">
        <div className="kodza-stack__media">
          <img src="https://kodza.dev/media/kz-columns-2400.webp" alt="A row of square concrete pillars under a flat roof, casting striped shadows" loading="lazy" />
        </div>
        <div className="kodza-stack__body">
          <p className="kodza-stack__index">03</p>
          <h3 className="kodza-stack__title">Tweak</h3>
          <p className="kodza-stack__text">Colors, sizes and timings are CSS variables. Make it yours in thirty seconds.</p>
        </div>
      </article>
      <article className="kodza-stack__card">
        <div className="kodza-stack__media">
          <img src="https://kodza.dev/media/kz-float-2400.webp" alt="A concrete block hovering above the ground, over its own shadow" loading="lazy" />
        </div>
        <div className="kodza-stack__body">
          <p className="kodza-stack__index">04</p>
          <h3 className="kodza-stack__title">Ship</h3>
          <p className="kodza-stack__text">Push it live, close the laptop, and go home early.</p>
        </div>
      </article>
    </div>
  );
}