Image Split Cards
One image laid over a row of cards. Pinned while you scroll, it splits along the gaps, then each piece turns over to show its card, one after the other. Scroll back and the picture comes back together.
View codeSection Tone Shift
The page turns from paper to ink as a marked section takes the middle of the screen, the colour following the scroll. The text changes side halfway, and an event tells your header.
Scroll
No dependencies
scrollbackgroundcolordark sectionthemeheaderlandingscrub
Added Nov 2026
With your AI
Just ask.
Say it to your AI. It gets the exact code below, not its best guess, and knows where it goes.
Add the Kodza Section Tone Shift to my page.
Not plugged in yet?
Also in Codex, Cursor and VS Code.
claude mcp add -t http kodza https://kodza.dev/api/mcp
<div class="kodza-section-tone-shift" data-kodza-section-tone-shift>
<section class="kodza-section-tone-shift__section">
<div class="kodza-section-tone-shift__head">
<div class="kodza-section-tone-shift__lead">
<p class="kodza-section-tone-shift__label">Atelier Nord · Nantes</p>
<h2 class="kodza-section-tone-shift__title">Websites for people who are tired of websites.</h2>
</div>
<p class="kodza-section-tone-shift__text">Four people above a bakery in Nantes. We build fast, quiet sites for architects, a ferry company and one very particular cheese shop.</p>
</div>
<dl class="kodza-section-tone-shift__figures">
<div class="kodza-section-tone-shift__figure"><dt class="kodza-section-tone-shift__caption">First paint, on a train</dt><dd class="kodza-section-tone-shift__value">0.6 s</dd></div>
<div class="kodza-section-tone-shift__figure"><dt class="kodza-section-tone-shift__caption">Carousels shipped since 2019</dt><dd class="kodza-section-tone-shift__value">0</dd></div>
<div class="kodza-section-tone-shift__figure"><dt class="kodza-section-tone-shift__caption">Clients who came back</dt><dd class="kodza-section-tone-shift__value">11 of 12</dd></div>
</dl>
</section>
<section class="kodza-section-tone-shift__section" data-tone-shift>
<p class="kodza-section-tone-shift__label">What we refuse</p>
<h2 class="kodza-section-tone-shift__title kodza-section-tone-shift__title--statement">No carousel. No chatbot. No hero video of people laughing at a salad.</h2>
<ol class="kodza-section-tone-shift__list">
<li class="kodza-section-tone-shift__item"><span class="kodza-section-tone-shift__num">01</span>Cookie banners that ask twice.</li>
<li class="kodza-section-tone-shift__item"><span class="kodza-section-tone-shift__num">02</span>Fonts loaded from four different places.</li>
<li class="kodza-section-tone-shift__item"><span class="kodza-section-tone-shift__num">03</span>Animations you have to wait for.</li>
</ol>
<p class="kodza-section-tone-shift__text">Everything on a page has a job. If we cannot say what it does in one sentence, it goes, and the page gets faster without anybody writing a line of code.</p>
</section>
<section class="kodza-section-tone-shift__section">
<p class="kodza-section-tone-shift__label">Next</p>
<h2 class="kodza-section-tone-shift__title">Tell us what the site has to do. We will tell you what it can live without.</h2>
<div class="kodza-section-tone-shift__actions">
<a class="kodza-section-tone-shift__button" href="#">Start a project</a>
<p class="kodza-section-tone-shift__note">Replies within a day, from a human.</p>
</div>
</section>
</div>/* Kodza License: free to use, client work included. Not to resell or redistribute, ported or not: https://kodza.dev/docs/#print-license */
/* Kodza — Section Tone Shift
Wraps a run of sections. While one marked data-tone-shift holds the middle of the screen, the
whole page turns from its own tone to the other one, and back as the section leaves: the
background follows the scroll, the text and the hairlines change side at once, halfway, so they
never sit grey on grey. Without the script (or with reduced motion), the marked sections simply
wear the other tone.
Tuned with the --kz-section-tone-shift-* variables (the two tones first); the band, the
thresholds and the smoothing are constants at the top of component.js. */
.kodza-section-tone-shift {
/* The page's own tone: background, text, quiet text and hairlines */
--kz-section-tone-shift-from: var(--kz-color-page, #f2f2f0);
--kz-section-tone-shift-from-ink: var(--kz-color-ink, #0a0a0a);
--kz-section-tone-shift-from-muted: color-mix(in srgb, var(--kz-section-tone-shift-from-ink) 66%, transparent);
--kz-section-tone-shift-from-line: color-mix(in srgb, var(--kz-section-tone-shift-from-ink) 14%, transparent);
/* The tone a marked section turns the page to */
--kz-section-tone-shift-to: var(--kz-color-ink, #0a0a0a);
--kz-section-tone-shift-to-ink: var(--kz-color-page, #f2f2f0);
--kz-section-tone-shift-to-muted: color-mix(in srgb, var(--kz-section-tone-shift-to-ink) 66%, transparent);
--kz-section-tone-shift-to-line: color-mix(in srgb, var(--kz-section-tone-shift-to-ink) 16%, transparent);
/* How fast the text and the hairlines change side, once the background is halfway: soft at both
ends, quick through the middle, where the text passes the grey of the background */
--kz-section-tone-shift-duration: 0.3s;
--kz-section-tone-shift-ease: cubic-bezier(0.65, 0, 0.35, 1);
--kz-section-tone-shift-mono: var(--kz-font-mono, "Geist Mono", ui-monospace, SFMono-Regular, Menlo, monospace);
/* The tone the content is in now, for your own elements too: color: var(--kz-section-tone-shift-ink) */
--kz-section-tone-shift-bg: var(--kz-section-tone-shift-from);
--kz-section-tone-shift-ink: var(--kz-section-tone-shift-from-ink);
--kz-section-tone-shift-muted: var(--kz-section-tone-shift-from-muted);
--kz-section-tone-shift-line: var(--kz-section-tone-shift-from-line);
display: block;
background-color: var(--kz-section-tone-shift-from);
color: var(--kz-section-tone-shift-ink);
}
/* Without the script, or asked to sit still: each marked section wears the other tone on its own */
.kodza-section-tone-shift:not(.is-shifting) [data-tone-shift],
.kodza-section-tone-shift.is-shifted {
--kz-section-tone-shift-bg: var(--kz-section-tone-shift-to);
--kz-section-tone-shift-ink: var(--kz-section-tone-shift-to-ink);
--kz-section-tone-shift-muted: var(--kz-section-tone-shift-to-muted);
--kz-section-tone-shift-line: var(--kz-section-tone-shift-to-line);
}
.kodza-section-tone-shift:not(.is-shifting) [data-tone-shift] {
background-color: var(--kz-section-tone-shift-to);
color: var(--kz-section-tone-shift-ink);
}
/* Halfway between the tones, on a mid grey: the soft text takes the full ink to stay readable */
.kodza-section-tone-shift.is-crossing {
--kz-section-tone-shift-muted: var(--kz-section-tone-shift-ink);
}
/* Running: the whole page paints the mix the script writes (0 its own tone, 1 the other one) */
.kodza-section-tone-shift.is-shifting {
background-color: color-mix(in oklab, var(--kz-section-tone-shift-to) calc(var(--kz-section-tone-shift-mix, 0) * 100%), var(--kz-section-tone-shift-from));
}
/* The example sections */
.kodza-section-tone-shift__section {
box-sizing: border-box;
display: grid;
gap: clamp(28px, 4vw, 48px);
align-content: start;
padding: clamp(96px, 13vw, 168px) max(24px, calc((100% - 1080px) / 2));
}
.kodza-section-tone-shift__head {
display: grid;
grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
gap: clamp(24px, 5vw, 72px);
align-items: end;
}
.kodza-section-tone-shift__lead {
display: grid;
gap: 22px;
}
.kodza-section-tone-shift__label {
display: flex;
align-items: center;
gap: 10px;
margin: 0;
color: var(--kz-section-tone-shift-muted);
font-family: var(--kz-font-label, var(--kz-section-tone-shift-mono));
font-size: var(--kz-font-label-size, 12.5px);
font-weight: var(--kz-font-label-weight, 500);
line-height: var(--kz-font-label-leading, 1.4);
letter-spacing: var(--kz-font-label-tracking, 0.02em);
text-transform: var(--kz-font-label-case, inherit);
}
/* A drawn dot before each label */
.kodza-section-tone-shift__label::before {
content: "";
flex: none;
width: 6px;
height: 6px;
border-radius: var(--kz-radius-pill, 999px);
background: currentColor;
}
.kodza-section-tone-shift__title {
max-width: 18ch;
margin: 0;
font-family: var(--kz-font-display, inherit);
font-size: calc(clamp(34px, 5.4vw, 72px) * var(--kz-font-display-scale, 1));
font-weight: var(--kz-font-display-weight, 600);
line-height: 1.02;
letter-spacing: var(--kz-font-display-tracking, -0.045em);
text-transform: var(--kz-font-display-case, inherit);
text-wrap: balance;
}
.kodza-section-tone-shift__title--statement {
max-width: 15ch;
font-size: calc(clamp(40px, 7.4vw, 104px) * var(--kz-font-display-scale, 1));
line-height: 0.98;
letter-spacing: var(--kz-font-display-tracking, -0.05em);
}
.kodza-section-tone-shift__text {
max-width: 46ch;
margin: 0;
color: var(--kz-section-tone-shift-muted);
font-size: 17px;
line-height: 1.6;
text-wrap: pretty;
}
.kodza-section-tone-shift__figures {
display: grid;
grid-template-columns: repeat(3, minmax(0, 1fr));
gap: 24px;
margin: clamp(24px, 4vw, 48px) 0 0;
padding: 24px 0 0;
border-top: 1px solid var(--kz-section-tone-shift-line);
}
.kodza-section-tone-shift__figure {
display: flex;
flex-direction: column-reverse;
justify-content: flex-end;
gap: 8px;
}
.kodza-section-tone-shift__value {
margin: 0;
font-family: var(--kz-font-display, inherit);
font-size: calc(clamp(28px, 3.4vw, 40px) * var(--kz-font-display-scale, 1));
font-weight: var(--kz-font-display-weight, 600);
line-height: 1.05;
letter-spacing: var(--kz-font-display-tracking, -0.04em);
}
.kodza-section-tone-shift__caption,
.kodza-section-tone-shift__num,
.kodza-section-tone-shift__note {
margin: 0;
color: var(--kz-section-tone-shift-muted);
font-family: var(--kz-font-label, var(--kz-section-tone-shift-mono));
font-size: var(--kz-font-label-size, 12.5px);
font-weight: var(--kz-font-label-weight, 500);
line-height: var(--kz-font-label-leading, 1.4);
letter-spacing: var(--kz-font-label-tracking, 0.02em);
text-transform: var(--kz-font-label-case, inherit);
}
.kodza-section-tone-shift__list {
max-width: 720px;
margin: clamp(8px, 2vw, 24px) 0 0;
padding: 0;
list-style: none;
border-bottom: 1px solid var(--kz-section-tone-shift-line);
}
.kodza-section-tone-shift__item {
display: grid;
grid-template-columns: 56px minmax(0, 1fr);
align-items: baseline;
margin: 0;
padding: 20px 0;
border-top: 1px solid var(--kz-section-tone-shift-line);
text-wrap: pretty;
font-size: clamp(18px, 2vw, 22px);
font-weight: 500;
line-height: 1.35;
letter-spacing: -0.02em;
}
.kodza-section-tone-shift__actions {
display: flex;
flex-wrap: wrap;
align-items: center;
gap: 16px 24px;
margin-top: clamp(4px, 1vw, 12px);
}
.kodza-section-tone-shift__button {
display: inline-flex;
align-items: center;
height: 52px;
padding: 0 26px;
border-radius: var(--kz-radius-pill, 999px);
background: var(--kz-section-tone-shift-ink);
color: var(--kz-section-tone-shift-bg);
font-family: var(--kz-font-label, inherit);
font-size: var(--kz-font-label-size, 15px);
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, inherit);
text-decoration: none;
}
.kodza-section-tone-shift__button:focus-visible {
outline: 2px solid var(--kz-section-tone-shift-ink);
outline-offset: 3px;
}
@media (hover: hover) {
.kodza-section-tone-shift__button:hover {
opacity: 0.86;
}
}
/* Moving: the text and the hairlines change side together, in one short crossing */
.kodza-section-tone-shift.is-moving,
.kodza-section-tone-shift.is-moving :is(.kodza-section-tone-shift__label, .kodza-section-tone-shift__text, .kodza-section-tone-shift__caption, .kodza-section-tone-shift__num, .kodza-section-tone-shift__note) {
transition: color calc(var(--kz-section-tone-shift-duration) * var(--kz-motion-scale, 1)) var(--kz-section-tone-shift-ease);
}
.kodza-section-tone-shift.is-moving :is(.kodza-section-tone-shift__figures, .kodza-section-tone-shift__list, .kodza-section-tone-shift__item) {
transition: border-color calc(var(--kz-section-tone-shift-duration) * var(--kz-motion-scale, 1)) var(--kz-section-tone-shift-ease);
}
.kodza-section-tone-shift.is-moving .kodza-section-tone-shift__button {
transition:
background-color calc(var(--kz-section-tone-shift-duration) * var(--kz-motion-scale, 1)) var(--kz-section-tone-shift-ease),
color calc(var(--kz-section-tone-shift-duration) * var(--kz-motion-scale, 1)) var(--kz-section-tone-shift-ease),
opacity calc(0.2s * var(--kz-motion-scale, 1)) ease;
}
@media (max-width: 759.98px) {
.kodza-section-tone-shift__head {
grid-template-columns: minmax(0, 1fr);
align-items: start;
}
}
@media (max-width: 559.98px) {
.kodza-section-tone-shift__figures {
grid-template-columns: minmax(0, 1fr);
gap: 20px;
}
.kodza-section-tone-shift__item {
grid-template-columns: 44px minmax(0, 1fr);
}
}
@media (prefers-reduced-motion: reduce) {
.kodza-section-tone-shift,
.kodza-section-tone-shift *,
.kodza-section-tone-shift *::before,
.kodza-section-tone-shift *::after {
transition-duration: 0.01ms !important;
animation-duration: 0.01ms !important;
}
}
/* kodza-guard 8ae6750d6885 — 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-section-tone-shift__label):not(#_),
:where(.kodza-section-tone-shift__text):not(#_),
:where(.kodza-section-tone-shift__caption):not(#_),
:where(.kodza-section-tone-shift__note):not(#_) {
transition: revert;
background-color: revert;
}
:where(.kodza-section-tone-shift__title):not(#_),
:where(.kodza-section-tone-shift__figures):not(#_),
:where(.kodza-section-tone-shift__value):not(#_),
:where(.kodza-section-tone-shift__list):not(#_),
:where(.kodza-section-tone-shift__item):not(#_) {
transition: revert;
background-color: revert;
color: revert;
}
:where(.kodza-section-tone-shift__button):not(#_) {
outline: revert;
transition: revert;
outline-offset: revert;
}
/* What the browser gives, on everything the component leaves to it */
.kodza-section-tone-shift:not(#_),
.kodza-section-tone-shift__head:not(#_),
.kodza-section-tone-shift__lead:not(#_),
.kodza-section-tone-shift__figure:not(#_),
.kodza-section-tone-shift__num:not(#_),
.kodza-section-tone-shift__actions:not(#_) {
box-sizing: revert;
}
.kodza-section-tone-shift__label:not(#_),
.kodza-section-tone-shift__caption:not(#_),
.kodza-section-tone-shift__note:not(#_) {
border: revert;
padding: revert;
border-radius: revert;
outline: revert;
text-decoration: revert;
list-style: revert;
box-sizing: revert;
float: revert;
position: revert;
background-image: revert;
box-shadow: revert;
outline-offset: revert;
appearance: revert;
max-width: revert;
max-height: revert;
font-style: revert;
text-underline-offset: revert;
text-align: revert;
text-indent: revert;
text-shadow: revert;
vertical-align: revert;
}
.kodza-section-tone-shift__title:not(#_) {
border: revert;
padding: revert;
border-radius: revert;
outline: revert;
text-decoration: revert;
list-style: revert;
box-sizing: revert;
float: revert;
position: revert;
background-image: revert;
box-shadow: revert;
outline-offset: revert;
appearance: revert;
max-height: revert;
font-style: revert;
text-underline-offset: revert;
text-align: revert;
text-indent: revert;
text-shadow: revert;
vertical-align: revert;
}
.kodza-section-tone-shift__text:not(#_) {
border: revert;
padding: revert;
border-radius: revert;
outline: revert;
text-decoration: revert;
list-style: revert;
box-sizing: revert;
float: revert;
position: 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-section-tone-shift__figures:not(#_) {
border-radius: revert;
outline: revert;
text-decoration: revert;
list-style: revert;
box-sizing: revert;
float: revert;
position: revert;
border-right-width: revert;
border-bottom-width: revert;
border-left-width: revert;
border-right-style: revert;
border-bottom-style: revert;
border-left-style: revert;
border-right-color: revert;
border-bottom-color: revert;
border-left-color: revert;
background-image: revert;
box-shadow: 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-section-tone-shift__value:not(#_) {
border: revert;
padding: revert;
border-radius: revert;
outline: revert;
text-decoration: revert;
list-style: revert;
box-sizing: revert;
float: revert;
position: revert;
background-image: revert;
box-shadow: revert;
outline-offset: revert;
appearance: revert;
max-width: revert;
max-height: revert;
font-style: revert;
text-transform: revert;
text-underline-offset: revert;
text-align: revert;
text-indent: revert;
text-shadow: revert;
vertical-align: revert;
}
.kodza-section-tone-shift__list:not(#_) {
border-radius: revert;
outline: revert;
text-decoration: revert;
box-sizing: revert;
float: revert;
position: revert;
border-top-width: revert;
border-right-width: revert;
border-left-width: revert;
border-top-style: revert;
border-right-style: revert;
border-left-style: revert;
border-top-color: revert;
border-right-color: revert;
border-left-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-section-tone-shift__item:not(#_) {
border-radius: revert;
outline: revert;
text-decoration: revert;
list-style: revert;
box-sizing: revert;
float: revert;
position: revert;
border-right-width: revert;
border-bottom-width: revert;
border-left-width: revert;
border-right-style: revert;
border-bottom-style: revert;
border-left-style: revert;
border-right-color: revert;
border-bottom-color: revert;
border-left-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;
text-transform: revert;
text-underline-offset: revert;
text-align: revert;
text-indent: revert;
text-shadow: revert;
vertical-align: revert;
}
.kodza-section-tone-shift__button:not(#_) {
border: revert;
margin: revert;
list-style: revert;
box-sizing: revert;
float: revert;
position: revert;
box-shadow: revert;
appearance: revert;
max-width: revert;
max-height: revert;
font-style: revert;
text-underline-offset: revert;
text-align: revert;
text-indent: revert;
text-shadow: revert;
vertical-align: revert;
}
.kodza-section-tone-shift__title:not(#_):where(:not([hidden])),
.kodza-section-tone-shift__text:not(#_):where(:not([hidden])),
.kodza-section-tone-shift__caption:not(#_):where(:not([hidden])),
.kodza-section-tone-shift__value:not(#_):where(:not([hidden])),
.kodza-section-tone-shift__list:not(#_):where(:not([hidden])),
.kodza-section-tone-shift__note:not(#_):where(:not([hidden])) {
display: revert;
}
.kodza-section-tone-shift__title:not(#_):where([hidden]),
.kodza-section-tone-shift__text:not(#_):where([hidden]),
.kodza-section-tone-shift__caption:not(#_):where([hidden]),
.kodza-section-tone-shift__value:not(#_):where([hidden]),
.kodza-section-tone-shift__list:not(#_):where([hidden]),
.kodza-section-tone-shift__note:not(#_):where([hidden]) {
display: none;
}
.kodza-section-tone-shift__label: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-section-tone-shift:not(.is-shifting) [data-tone-shift]:where(a, p, h2, dl, dt, dd, ol, li):not(#_) {
background-color: var(--kz-section-tone-shift-to);
color: var(--kz-section-tone-shift-ink);
}
.kodza-section-tone-shift__label:not(#_) {
display: flex;
margin: 0;
color: var(--kz-section-tone-shift-muted);
font-family: var(--kz-font-label, var(--kz-section-tone-shift-mono));
font-size: var(--kz-font-label-size, 12.5px);
font-weight: var(--kz-font-label-weight, 500);
line-height: var(--kz-font-label-leading, 1.4);
letter-spacing: var(--kz-font-label-tracking, 0.02em);
text-transform: var(--kz-font-label-case, inherit);
}
.kodza-section-tone-shift__title:not(#_) {
max-width: 18ch;
margin: 0;
font-family: var(--kz-font-display, inherit);
font-size: calc(clamp(34px, 5.4vw, 72px) * var(--kz-font-display-scale, 1));
font-weight: var(--kz-font-display-weight, 600);
line-height: 1.02;
letter-spacing: var(--kz-font-display-tracking, -0.045em);
text-transform: var(--kz-font-display-case, inherit);
}
.kodza-section-tone-shift__title--statement:not(#_) {
max-width: 15ch;
font-size: calc(clamp(40px, 7.4vw, 104px) * var(--kz-font-display-scale, 1));
line-height: 0.98;
letter-spacing: var(--kz-font-display-tracking, -0.05em);
}
.kodza-section-tone-shift__text:not(#_) {
max-width: 46ch;
margin: 0;
color: var(--kz-section-tone-shift-muted);
font-size: 17px;
line-height: 1.6;
}
.kodza-section-tone-shift__figures:not(#_) {
display: grid;
margin: clamp(24px, 4vw, 48px) 0 0;
padding: 24px 0 0;
border-top: 1px solid var(--kz-section-tone-shift-line);
}
.kodza-section-tone-shift__value:not(#_) {
margin: 0;
font-family: var(--kz-font-display, inherit);
font-size: calc(clamp(28px, 3.4vw, 40px) * var(--kz-font-display-scale, 1));
font-weight: var(--kz-font-display-weight, 600);
line-height: 1.05;
letter-spacing: var(--kz-font-display-tracking, -0.04em);
}
.kodza-section-tone-shift__caption:not(#_),
.kodza-section-tone-shift__note:not(#_) {
margin: 0;
color: var(--kz-section-tone-shift-muted);
font-family: var(--kz-font-label, var(--kz-section-tone-shift-mono));
font-size: var(--kz-font-label-size, 12.5px);
font-weight: var(--kz-font-label-weight, 500);
line-height: var(--kz-font-label-leading, 1.4);
letter-spacing: var(--kz-font-label-tracking, 0.02em);
text-transform: var(--kz-font-label-case, inherit);
}
.kodza-section-tone-shift__list:not(#_) {
max-width: 720px;
margin: clamp(8px, 2vw, 24px) 0 0;
padding: 0;
list-style: none;
border-bottom: 1px solid var(--kz-section-tone-shift-line);
}
.kodza-section-tone-shift__item:not(#_) {
display: grid;
margin: 0;
padding: 20px 0;
border-top: 1px solid var(--kz-section-tone-shift-line);
font-size: clamp(18px, 2vw, 22px);
font-weight: 500;
line-height: 1.35;
letter-spacing: -0.02em;
}
.kodza-section-tone-shift__button:not(#_) {
display: inline-flex;
padding: 0 26px;
border-radius: var(--kz-radius-pill, 999px);
background: var(--kz-section-tone-shift-ink);
color: var(--kz-section-tone-shift-bg);
font-family: var(--kz-font-label, inherit);
font-size: var(--kz-font-label-size, 15px);
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, inherit);
text-decoration: none;
}
.kodza-section-tone-shift__button:focus-visible:not(#_) {
outline: 2px solid var(--kz-section-tone-shift-ink);
outline-offset: 3px;
}
.kodza-section-tone-shift.is-moving :is(.kodza-section-tone-shift__label, .kodza-section-tone-shift__text, .kodza-section-tone-shift__caption, .kodza-section-tone-shift__num, .kodza-section-tone-shift__note):where(p, h2, dl, dt, dd, ol, li, a):not(#_) {
transition: color calc(var(--kz-section-tone-shift-duration) * var(--kz-motion-scale, 1)) var(--kz-section-tone-shift-ease);
}
.kodza-section-tone-shift.is-moving :is(.kodza-section-tone-shift__figures, .kodza-section-tone-shift__list, .kodza-section-tone-shift__item):where(p, h2, dl, dt, dd, ol, li, a):not(#_) {
transition: border-color calc(var(--kz-section-tone-shift-duration) * var(--kz-motion-scale, 1)) var(--kz-section-tone-shift-ease);
}
.kodza-section-tone-shift.is-moving .kodza-section-tone-shift__button:not(#_) {
transition: background-color calc(var(--kz-section-tone-shift-duration) * var(--kz-motion-scale, 1)) var(--kz-section-tone-shift-ease),
color calc(var(--kz-section-tone-shift-duration) * var(--kz-motion-scale, 1)) var(--kz-section-tone-shift-ease),
opacity calc(0.2s * var(--kz-motion-scale, 1)) ease;
}
@media (prefers-reduced-motion: reduce) {
.kodza-section-tone-shift *:where(p, h2, dl, dt, dd, ol, li, a):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 — Section Tone Shift
// Measures how much of a band around the middle of the screen the marked sections cover, and
// writes it, with a soft follow, as the mix of the two tones (--kz-section-tone-shift-mix): the
// background follows the scroll. Halfway, the text and the hairlines change side (is-shifted), the
// root says which tone the page is in (data-header-tone, read by Scroll Header) and sends
// kodza:tone, for a header of your own. Reduced motion, or a site pace of 0: each marked section
// wears the other tone on its own, and says so in data-header-tone.
(() => {
const SELECTOR = '[data-kodza-section-tone-shift]';
// The band around the middle of the screen, as a share of its height: the page shifts while the
// edge of a marked section crosses it, and holds the other tone while the section covers it
const BAND = 0.4;
// The text changes side once the band is this covered, and back below the second: the gap keeps
// it from flickering when the scroll stops right on the edge
const SHIFT_IN = 0.55;
const SHIFT_OUT = 0.45;
// Between these mixes the page is a mid grey: the soft text (labels, paragraphs) takes the full
// ink, so it stays readable if the scroll stops there
const CROSSING_FROM = 0.2;
const CROSSING_TO = 0.8;
// How long the background takes to catch up with the scroll, in ms (times the site's pace): a
// soft follow instead of a colour glued to the wheel. 0 glues it
const SMOOTHING = 120;
// The mix left to travel below this ends the loop
const SETTLE = 0.0005;
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;
};
const clamp = (value, min, max) => Math.min(max, Math.max(min, value));
// Slow out of one tone, slow into the other
const ease = (t) => (t < 0.5 ? 4 * t * t * t : 1 - (-2 * t + 2) ** 3 / 2);
// 'dark' or 'light', for any CSS colour (hex, rgb, oklch…): painted on a 1px canvas and read back,
// then dark when white text would contrast more with it than black text
let pixel = null;
const toneOf = (color) => {
pixel ??= Object.assign(document.createElement('canvas'), { width: 1, height: 1 }).getContext('2d', { willReadFrequently: true });
pixel.clearRect(0, 0, 1, 1);
pixel.fillStyle = '#fff';
pixel.fillStyle = color.trim() || '#fff';
pixel.fillRect(0, 0, 1, 1);
const [r, g, b] = pixel.getImageData(0, 0, 1, 1).data;
const linear = (c) => ((c /= 255) <= 0.04045 ? c / 12.92 : ((c + 0.055) / 1.055) ** 2.4);
return 0.2126 * linear(r) + 0.7152 * linear(g) + 0.0722 * linear(b) < 0.179 ? 'dark' : 'light';
};
// 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 marked = [...root.querySelectorAll('[data-tone-shift]')];
if (!marked.length) return;
const styles = getComputedStyle(root);
const toneAt = (end) => toneOf(styles.getPropertyValue(`--kz-section-tone-shift-${end}`));
const pace = paceOf(root);
const still = reduceMotion || !pace; // the still path: no motion asked, by the visitor or the site
if (still) {
root.dataset.headerTone = toneAt('from');
marked.forEach((section) => { section.dataset.headerTone = toneAt('to'); });
return;
}
const smoothing = SMOOTHING * pace;
let current = null; // the mix written now
let shifted = null; // which side the text is on
let raf = 0;
let last = 0;
let shown = false;
// How much of the band the marked sections cover, eased: 0 the page's own tone, 1 the other one
const goal = () => {
const top = (innerHeight * (1 - BAND)) / 2;
const bottom = innerHeight - top;
let covered = 0;
marked.forEach((section) => {
const rect = section.getBoundingClientRect();
covered += Math.max(0, Math.min(rect.bottom, bottom) - Math.max(rect.top, top));
});
return ease(clamp(covered / (bottom - top), 0, 1));
};
// Decided on the scroll itself, before the next frame: a header that reads the tone in its own
// frame (Scroll Header) already finds the new one
const decide = (value) => {
const next = shifted ? value > SHIFT_OUT : value >= SHIFT_IN;
if (next === shifted) return;
shifted = next;
root.classList.toggle('is-shifted', next);
const tone = toneAt(next ? 'to' : 'from');
root.dataset.headerTone = tone;
root.dispatchEvent(new CustomEvent('kodza:tone', { bubbles: true, detail: { tone, shifted: next } }));
};
const write = () => {
root.style.setProperty('--kz-section-tone-shift-mix', current.toFixed(4));
root.classList.toggle('is-crossing', current > CROSSING_FROM && current < CROSSING_TO);
};
const tick = (now) => {
raf = 0;
const to = goal();
const step = last ? Math.min(now - last, 64) : 16.7;
last = now;
if (current === null || !smoothing) current = to;
else current += (to - current) * (1 - Math.exp(-step / smoothing));
if (Math.abs(to - current) < SETTLE) current = to;
write();
decide(current);
if (current !== to) raf = requestAnimationFrame(tick);
else last = 0;
};
const queue = () => {
if (!shown || raf) return;
raf = requestAnimationFrame(tick);
};
const follow = () => {
if (!shown) return;
queue();
};
// Placed at once, without the crossing: on load, or back on screen after a jump (an anchor, Home)
const place = () => {
current = goal();
write();
decide(current);
};
root.classList.add('is-shifting');
place();
// Next frame, once the first tone is painted: from now on the text crosses instead of jumping
requestAnimationFrame(() => root.classList.add('is-moving'));
const io = new IntersectionObserver(([entry]) => {
shown = entry.isIntersecting;
if (shown) {
place();
queue();
}
});
io.observe(root);
const resize = new ResizeObserver(follow);
resize.observe(root);
window.addEventListener('scroll', follow, { passive: true, signal });
window.addEventListener('resize', follow, { signal });
signal.addEventListener('abort', () => {
io.disconnect();
resize.disconnect();
cancelAnimationFrame(raf);
});
}
// 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 });
})();'use client';
// Kodza — Section Tone Shift, for React. From https://kodza.dev/components/section-tone-shift/
// 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: section-tone-shift.css and section-tone-shift.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 './section-tone-shift.css';
export type SectionToneShiftProps = Omit<ComponentPropsWithoutRef<'div'>, "children" | "vars" | "onTone"> & {
/** Settings, as CSS variables on the root */
vars?: {
/** default: var(--kz-color-page, #f2f2f0) */
"--kz-section-tone-shift-from"?: string | number;
/** default: var(--kz-color-ink, #0a0a0a) */
"--kz-section-tone-shift-from-ink"?: string | number;
/** default: color-mix(in srgb, var(--kz-section-tone-shift-from-ink) 66%, transparent) */
"--kz-section-tone-shift-from-muted"?: string | number;
/** default: color-mix(in srgb, var(--kz-section-tone-shift-from-ink) 14%, transparent) */
"--kz-section-tone-shift-from-line"?: string | number;
/** default: var(--kz-color-ink, #0a0a0a) */
"--kz-section-tone-shift-to"?: string | number;
/** default: var(--kz-color-page, #f2f2f0) */
"--kz-section-tone-shift-to-ink"?: string | number;
/** default: color-mix(in srgb, var(--kz-section-tone-shift-to-ink) 66%, transparent) */
"--kz-section-tone-shift-to-muted"?: string | number;
/** default: color-mix(in srgb, var(--kz-section-tone-shift-to-ink) 16%, transparent) */
"--kz-section-tone-shift-to-line"?: string | number;
/** default: 0.3s */
"--kz-section-tone-shift-duration"?: string | number;
/** default: cubic-bezier(0.65, 0, 0.35, 1) */
"--kz-section-tone-shift-ease"?: string | number;
/** default: var(--kz-font-mono, "Geist Mono", ui-monospace, SFMono-Regular, Menlo, monospace) */
"--kz-section-tone-shift-mono"?: string | number;
/** default: var(--kz-section-tone-shift-from) */
"--kz-section-tone-shift-bg"?: string | number;
/** default: var(--kz-section-tone-shift-from-ink) */
"--kz-section-tone-shift-ink"?: string | number;
/** default: var(--kz-section-tone-shift-from-muted) */
"--kz-section-tone-shift-muted"?: string | number;
/** default: var(--kz-section-tone-shift-from-line) */
"--kz-section-tone-shift-line"?: string | number;
};
/** "kodza:tone", fired by the script (bubbles from the root) */
onTone?: (event: CustomEvent) => void;
className?: string;
};
export function SectionToneShift({ vars, onTone, className, style, ...rest }: SectionToneShiftProps) {
const ref = useRef<ComponentRef<'div'>>(null);
const classes = ["kodza-section-tone-shift", 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('./section-tone-shift.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 || !onTone) return;
const listener = (event: Event) => onTone(event as CustomEvent);
root.addEventListener("kodza:tone", listener);
return () => root.removeEventListener("kodza:tone", listener);
}, [onTone, key]);
return (
<div data-kodza-section-tone-shift="" key={key} {...rest} className={classes} data-kodza-manual style={{ ...vars, ...style } as CSSProperties} ref={ref}>
<section className="kodza-section-tone-shift__section">
<div className="kodza-section-tone-shift__head">
<div className="kodza-section-tone-shift__lead">
<p className="kodza-section-tone-shift__label">Atelier Nord · Nantes</p>
<h2 className="kodza-section-tone-shift__title">Websites for people who are tired of websites.</h2>
</div>
<p className="kodza-section-tone-shift__text">Four people above a bakery in Nantes. We build fast, quiet sites for architects, a ferry company and one very particular cheese shop.</p>
</div>
<dl className="kodza-section-tone-shift__figures">
<div className="kodza-section-tone-shift__figure">
<dt className="kodza-section-tone-shift__caption">First paint, on a train</dt>
<dd className="kodza-section-tone-shift__value">0.6 s</dd>
</div>
<div className="kodza-section-tone-shift__figure">
<dt className="kodza-section-tone-shift__caption">Carousels shipped since 2019</dt>
<dd className="kodza-section-tone-shift__value">0</dd>
</div>
<div className="kodza-section-tone-shift__figure">
<dt className="kodza-section-tone-shift__caption">Clients who came back</dt>
<dd className="kodza-section-tone-shift__value">11 of 12</dd>
</div>
</dl>
</section>
<section className="kodza-section-tone-shift__section" data-tone-shift="">
<p className="kodza-section-tone-shift__label">What we refuse</p>
<h2 className="kodza-section-tone-shift__title kodza-section-tone-shift__title--statement">No carousel. No chatbot. No hero video of people laughing at a salad.</h2>
<ol className="kodza-section-tone-shift__list">
<li className="kodza-section-tone-shift__item"><span className="kodza-section-tone-shift__num">01</span>Cookie banners that ask twice.</li>
<li className="kodza-section-tone-shift__item"><span className="kodza-section-tone-shift__num">02</span>Fonts loaded from four different places.</li>
<li className="kodza-section-tone-shift__item"><span className="kodza-section-tone-shift__num">03</span>Animations you have to wait for.</li>
</ol>
<p className="kodza-section-tone-shift__text">Everything on a page has a job. If we cannot say what it does in one sentence, it goes, and the page gets faster without anybody writing a line of code.</p>
</section>
<section className="kodza-section-tone-shift__section">
<p className="kodza-section-tone-shift__label">Next</p>
<h2 className="kodza-section-tone-shift__title">Tell us what the site has to do. We will tell you what it can live without.</h2>
<div className="kodza-section-tone-shift__actions">
<a className="kodza-section-tone-shift__button" href="#">Start a project</a>
<p className="kodza-section-tone-shift__note">Replies within a day, from a human.</p>
</div>
</section>
</div>
);
}Checked
Checked before you paste.
Robots poked at it before you did. Every component goes through the same checks, and again each time it changes.
What ranLast run
Accessibilityaxe-core 4.10.2: the WCAG 2.1 A and AA rules, plus best practices.
0 issues
KeyboardThe Tab key gets there, and the focus ring shows when it does.
Passed
Reduced motionTurn on reduced motion and what moved just appears. Nothing loops.
Passed
Light and darkThe same checks on both themes, contrast included.
Passed
WordPressPasted into Twenty Twenty-Five, Twenty Twenty-One, Astra, Blocksy, GeneratePress, Hello Elementor, Kadence and OceanWP. Nothing to flag.
8 / 8 themes
Robots checked this. A human with VoiceOver hasn't yet.
Inner Parallax Image
A picture that drifts slower than the page inside a frame that stays put. It wraps the image WordPress writes in its own frame, and the picture overhangs by its whole travel, so no gap ever shows.
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Media Expand
An image or a video in a rounded frame, set in from the edges, takes the full width as the scroll brings it to the middle of the screen. The corners square off, the caption rises, and it all reverses on the way back up.
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Reading Progress
A thin line under the header that fills as you read the article, not the whole page. Cut at each section, it can show the minutes left, and runs on the scroll itself where the browser can.
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Scroll Sequence
A numbered series of pictures drawn on one canvas as the scroll runs through a section that holds the screen. Captions come in on cue, and the frames load coarse to fine: a fast scroll never shows a blank.
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Scroll Gauge
A figure pinned in a corner of a long page. Each section carries its value, and as you read, the figure rolls to it digit by digit, with its unit, a note and a scale of the whole story.
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