Split Button

<div class="kodza-split" role="group" aria-label="Merge">
  <button class="kodza-split__main" type="button" value="merge"><span class="kodza-split__label">Merge pull request</span></button>
  <button class="kodza-split__toggle" type="button" aria-haspopup="menu" aria-expanded="false" aria-label="More ways to merge">
    <svg class="kodza-split__chevron" viewBox="0 0 16 16" aria-hidden="true"><path d="M4 6.5 8 10.5l4-4" fill="none" stroke="currentColor" stroke-width="1.6" stroke-linecap="round" stroke-linejoin="round"/></svg>
  </button>
  <div class="kodza-split__menu" role="menu" aria-label="Ways to merge">
    <button class="kodza-split__item" type="button" role="menuitemradio" aria-checked="true" value="merge">Merge pull request <span class="kodza-split__hint">every commit</span></button>
    <button class="kodza-split__item" type="button" role="menuitemradio" aria-checked="false" value="squash">Squash &amp; merge <span class="kodza-split__hint">one tidy commit</span></button>
    <button class="kodza-split__item" type="button" role="menuitemradio" aria-checked="false" value="rebase">Rebase <span class="kodza-split__hint">history, rewritten</span></button>
  </div>
</div>

<div class="kodza-split kodza-split--outline" role="group" aria-label="Save">
  <button class="kodza-split__main" type="button"><span class="kodza-split__label">Save draft</span></button>
  <button class="kodza-split__toggle" type="button" aria-haspopup="menu" aria-expanded="false" aria-label="More save options">
    <svg class="kodza-split__chevron" viewBox="0 0 16 16" aria-hidden="true"><path d="M4 6.5 8 10.5l4-4" fill="none" stroke="currentColor" stroke-width="1.6" stroke-linecap="round" stroke-linejoin="round"/></svg>
  </button>
  <div class="kodza-split__menu" role="menu" aria-label="Save options">
    <button class="kodza-split__item" type="button" role="menuitem">Save and publish <kbd class="kodza-split__hint">⌘↵</kbd></button>
    <button class="kodza-split__item" type="button" role="menuitem">Save as template</button>
    <button class="kodza-split__item" type="button" role="menuitem">Schedule for Monday</button>
    <div class="kodza-split__separator" role="separator"></div>
    <button class="kodza-split__item" type="button" role="menuitem" aria-disabled="true">Publish on a Friday <span class="kodza-split__hint">Nope</span></button>
  </div>
</div>

/* Kodza License: free to use, client work included. Not to resell or redistribute, ported or not: https://kodza.dev/docs/#print-license */
/* Kodza — Split Button
   The main action on the left, an arrow on the right that unrolls the other options in a menu.
   One tint slides from half to half under the pointer and stays on the arrow while the menu is
   open. Pick a way of doing it (menuitemradio) and the main label rolls to it, the button easing
   to its new width.
   Everything is tuned with the --kz-split-* variables. */
.kodza-split {
  --kz-split-bg: #0a0a0a;
  --kz-split-fg: #ffffff;
  --kz-split-border: transparent;
  --kz-split-divider: rgba(255, 255, 255, 0.22);
  --kz-split-tint: rgba(255, 255, 255, 0.14); /* the hover, under one half */
  --kz-split-height: 52px;
  --kz-split-pad-x: 24px;
  --kz-split-toggle: 50px; /* the arrow's half */
  --kz-split-menu-bg: #ffffff;
  --kz-split-menu-fg: #0a0a0a;
  --kz-split-menu-muted: rgba(10, 10, 10, 0.58);
  --kz-split-menu-border: rgba(10, 10, 10, 0.1);
  --kz-split-menu-soft: rgba(10, 10, 10, 0.06);
  --kz-split-menu-shadow: 0 18px 40px -16px rgba(10, 10, 10, 0.3);
  --kz-split-menu-width: 240px;
  --kz-split-duration: 0.35s;
  --kz-split-ease: cubic-bezier(0.22, 1, 0.36, 1);

  position: relative;
  display: inline-flex;
  align-items: stretch;
  box-sizing: border-box;
  height: var(--kz-split-height);
  border-radius: 999px;
  background: var(--kz-split-bg);
  box-shadow: inset 0 0 0 1.5px var(--kz-split-border);
  color: var(--kz-split-fg);
  vertical-align: middle;
  -webkit-tap-highlight-color: transparent;
  /* A number, not auto, so it can wait for the menu to roll up before dropping back */
  z-index: 0;
  transition: z-index 0s linear var(--kz-split-duration);
}

/* Open, the button rises above what follows it (its menu included) */
.kodza-split.is-open {
  z-index: 20;
  transition-delay: 0s;
}

/* The second look: a line, no fill */
.kodza-split--outline {
  --kz-split-bg: transparent;
  --kz-split-fg: #0a0a0a;
  --kz-split-border: rgba(10, 10, 10, 0.9);
  --kz-split-divider: rgba(10, 10, 10, 0.2);
  --kz-split-tint: rgba(10, 10, 10, 0.07);
}

.kodza-split__main,
.kodza-split__toggle {
  position: relative;
  display: inline-flex;
  align-items: center;
  margin: 0;
  border: 0;
  background: none;
  color: inherit;
  font: inherit;
  font-size: 15px;
  font-weight: 500;
  letter-spacing: -0.01em;
  white-space: nowrap;
  cursor: pointer;
}

.kodza-split__main {
  padding: 0 18px 0 var(--kz-split-pad-x);
  border-radius: 999px 0 0 999px;
}

.kodza-split__toggle {
  justify-content: center;
  width: var(--kz-split-toggle);
  padding: 0 4px 0 0;
  border-radius: 0 999px 999px 0;
}

/* The line between the two halves */
.kodza-split__toggle::before {
  content: "";
  position: absolute;
  top: 15px;
  bottom: 15px;
  left: 0;
  width: 1px;
  background: var(--kz-split-divider);
}

/* Keyboard focus: a ring cut like the tint, round at both ends of its half with 3px of air at
   the line, not a half-pill whose corners at the divider are square */
.kodza-split__main:focus-visible,
.kodza-split__toggle:focus-visible {
  outline: none;
}

.kodza-split__main:focus-visible::after,
.kodza-split__toggle:focus-visible::after {
  content: "";
  position: absolute;
  inset: 4px;
  border: 2px solid var(--kz-split-fg);
  border-radius: 999px;
  pointer-events: none;
}

.kodza-split__main:focus-visible::after {
  right: 3px;
}

.kodza-split__toggle:focus-visible::after {
  left: 3px;
}

.kodza-split__main:disabled,
.kodza-split__toggle:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

/* The label: one word on top of the other, so a new one can roll in */
.kodza-split__label {
  display: inline-grid;
  overflow: hidden;
  text-align: left;
  transition: transform 0.18s ease;
}

.kodza-split__label > span {
  grid-area: 1 / 1;
  justify-self: start; /* each word keeps its own width: the button can ease to it */
}

.kodza-split__chevron {
  width: 16px;
  height: 16px;
  transition: transform var(--kz-split-duration) var(--kz-split-ease);
}

.kodza-split__toggle[aria-expanded="true"] .kodza-split__chevron {
  transform: rotate(180deg);
}

/* Pressed: the half you press gives a little */
.kodza-split__main:active:not(:disabled) .kodza-split__label {
  transform: scale(0.97);
}

/* One tint for both halves, cut out by clip-path around the one under the pointer (the
   script sends the edges), so it slides from half to half like the family's indicator */
.kodza-split__tint {
  position: absolute;
  inset: 4px;
  z-index: -1;
  background: var(--kz-split-tint);
  opacity: var(--kz-split-tint-on, 0);
  clip-path: inset(0 var(--kz-split-tint-r, 100%) 0 var(--kz-split-tint-l, 0) round 999px);
  pointer-events: none;
}

.kodza-split.is-ready.is-gliding .kodza-split__tint {
  transition:
    clip-path 0.3s var(--kz-split-ease),
    opacity 0.2s ease;
}

.kodza-split.is-ready:not(.is-gliding) .kodza-split__tint {
  transition: opacity 0.2s ease;
}

/* The menu of the navigation family, unrolled from its top edge under the arrow */
.kodza-split__menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  z-index: 20;
  display: flex;
  flex-direction: column;
  box-sizing: border-box;
  min-width: max(100%, var(--kz-split-menu-width));
  max-width: calc(100vw - 16px);
  padding: 6px;
  border-radius: 14px;
  background: var(--kz-split-menu-bg);
  box-shadow: 0 0 0 1px var(--kz-split-menu-border), var(--kz-split-menu-shadow);
  color: var(--kz-split-menu-fg);
  visibility: hidden;
  opacity: 0;
  clip-path: inset(0 0 100% 0 round 14px);
  transform: translateY(-4px);
  transition:
    clip-path var(--kz-split-duration) var(--kz-split-ease),
    opacity 0.2s ease,
    transform var(--kz-split-duration) var(--kz-split-ease),
    visibility 0s linear var(--kz-split-duration);
}

.kodza-split.is-open .kodza-split__menu {
  visibility: visible;
  opacity: 1;
  clip-path: inset(-40px -40px -60px -40px round 14px);
  transform: none;
  transition-delay: 0s;
}

/* Not enough room below: it opens upwards; too close to the left edge: it lines up on the left */
.kodza-split.is-above .kodza-split__menu {
  top: auto;
  bottom: calc(100% + 8px);
  clip-path: inset(100% 0 0 0 round 14px);
  transform: translateY(4px);
}

.kodza-split.is-above.is-open .kodza-split__menu {
  clip-path: inset(-60px -40px -40px -40px round 14px);
  transform: none;
}

.kodza-split.is-start .kodza-split__menu {
  right: auto;
  left: var(--kz-split-shift, 0px);
}

/* One highlight for the whole menu, sent to the focused item */
.kodza-split__highlight {
  position: absolute;
  top: 0;
  right: 6px;
  left: 6px;
  height: var(--kz-hl-h, 36px);
  border-radius: 8px;
  background: var(--kz-split-menu-soft);
  opacity: var(--kz-hl-on, 0);
  transform: translateY(var(--kz-hl-y, 0));
  pointer-events: none;
}

.kodza-split.is-open .kodza-split__highlight {
  transition: transform 0.22s var(--kz-split-ease), opacity 0.15s ease;
}

.kodza-split__item {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  height: 36px;
  margin: 0;
  padding: 0 10px;
  border: 0;
  border-radius: 8px;
  background: none;
  color: inherit;
  font: inherit;
  font-size: 14px;
  font-weight: 500;
  text-align: left;
  white-space: nowrap;
  cursor: pointer;
}

.kodza-split__item:focus {
  outline: none;
}

.kodza-split__item[aria-disabled="true"] {
  color: var(--kz-split-menu-muted);
  cursor: not-allowed;
}

/* Ways of doing the main action keep room for the check of the current one */
.kodza-split__item[role="menuitemradio"] {
  padding-left: 32px;
}

.kodza-split__item[aria-checked="true"]::before {
  content: "";
  position: absolute;
  left: 10px;
  width: 14px;
  height: 14px;
  background: currentColor;
  -webkit-mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Cpath d='M3 8.5l3.2 3L13 4.5' fill='none' stroke='black' stroke-width='1.8' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center / contain no-repeat;
  mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Cpath d='M3 8.5l3.2 3L13 4.5' fill='none' stroke='black' stroke-width='1.8' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center / contain no-repeat;
}

.kodza-split__hint {
  font-family: ui-monospace, "SF Mono", Menlo, monospace;
  font-size: 12px;
  font-weight: 400;
  color: var(--kz-split-menu-muted);
  overflow: hidden;
  text-overflow: ellipsis;
}

.kodza-split__separator {
  height: 1px;
  margin: 6px -6px;
  background: var(--kz-split-menu-border);
}

/* The picked item blinks once, like a desktop menu */
.kodza-split.is-picking .kodza-split__highlight {
  animation: kodza-split-blink 0.16s steps(2, jump-none) 2;
}

@keyframes kodza-split-blink {
  50% {
    opacity: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .kodza-split__menu,
  .kodza-split.is-open .kodza-split__highlight,
  .kodza-split.is-ready .kodza-split__tint,
  .kodza-split__chevron,
  .kodza-split__label {
    transition-duration: 0.01ms !important;
  }

  .kodza-split.is-picking .kodza-split__highlight {
    animation: none;
  }
}

/* kodza-guard 5f757dbe8b9a — 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-split__main):not(#_),
:where(.kodza-split__toggle):not(#_),
:where(.kodza-split__item):not(#_) {
  outline: revert;
}

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

.kodza-split__tint:not(#_),
.kodza-split__label:not(#_),
.kodza-split__highlight:not(#_),
.kodza-split__separator:not(#_),
.kodza-split__label span:where(:not([class*="kodza-"])):not(#_) {
  box-sizing: revert;
}

.kodza-split__main:not(#_),
.kodza-split__toggle:not(#_) {
  text-decoration: revert;
  transition: revert;
  list-style: revert;
  box-sizing: revert;
  float: revert;
  box-shadow: revert;
  outline-offset: revert;
  appearance: revert;
  max-width: revert;
  max-height: revert;
  text-transform: revert;
  text-underline-offset: revert;
  text-align: revert;
  text-indent: revert;
  text-shadow: revert;
  vertical-align: revert;
  min-height: revert;
}

.kodza-split__chevron: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;
}

.kodza-split__menu:not(#_) {
  outline: revert;
  outline-offset: revert;
}

.kodza-split__item:not(#_) {
  text-decoration: revert;
  transition: revert;
  list-style: revert;
  box-sizing: revert;
  float: revert;
  box-shadow: revert;
  outline-offset: revert;
  appearance: revert;
  max-width: revert;
  max-height: revert;
  letter-spacing: revert;
  text-transform: revert;
  text-underline-offset: revert;
  text-indent: revert;
  text-shadow: revert;
  vertical-align: revert;
  min-height: revert;
}

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

.kodza-split__chevron:not(#_):where([hidden]),
.kodza-split__hint:not(#_):where([hidden]) {
  display: none;
}

.kodza-split__toggle:not(#_)::before,
.kodza-split__main:not(#_)::after,
.kodza-split__toggle:not(#_)::after,
.kodza-split__item: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-split__main:not(#_),
.kodza-split__toggle:not(#_) {
  position: relative;
  display: inline-flex;
  align-items: center;
  margin: 0;
  border: 0;
  background: none;
  color: inherit;
  font: inherit;
  font-size: 15px;
  font-weight: 500;
  letter-spacing: -0.01em;
  white-space: nowrap;
  cursor: pointer;
}

.kodza-split__main:not(#_) {
  padding: 0 18px 0 var(--kz-split-pad-x);
  border-radius: 999px 0 0 999px;
}

.kodza-split__toggle:not(#_) {
  justify-content: center;
  width: var(--kz-split-toggle);
  padding: 0 4px 0 0;
  border-radius: 0 999px 999px 0;
}

.kodza-split__toggle:not(#_)::before {
  content: "";
  position: absolute;
  top: 15px;
  bottom: 15px;
  left: 0;
  width: 1px;
  background: var(--kz-split-divider);
}

.kodza-split__main:focus-visible:not(#_),
.kodza-split__toggle:focus-visible:not(#_) {
  outline: none;
}

.kodza-split__main:focus-visible:not(#_)::after,
.kodza-split__toggle:focus-visible:not(#_)::after {
  content: "";
  position: absolute;
  inset: 4px;
  border: 2px solid var(--kz-split-fg);
  border-radius: 999px;
  pointer-events: none;
}

.kodza-split__main:focus-visible:not(#_)::after {
  right: 3px;
}

.kodza-split__toggle:focus-visible:not(#_)::after {
  left: 3px;
}

.kodza-split__main:disabled:not(#_),
.kodza-split__toggle:disabled:not(#_) {
  opacity: 0.45;
  cursor: not-allowed;
}

.kodza-split__chevron:not(#_) {
  transition: transform var(--kz-split-duration) var(--kz-split-ease);
}

.kodza-split__menu:not(#_) {
  box-shadow: 0 0 0 1px var(--kz-split-menu-border), var(--kz-split-menu-shadow);
}

.kodza-split__item:not(#_) {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  height: 36px;
  margin: 0;
  padding: 0 10px;
  border: 0;
  border-radius: 8px;
  background: none;
  color: inherit;
  font: inherit;
  font-size: 14px;
  font-weight: 500;
  text-align: left;
  white-space: nowrap;
  cursor: pointer;
}

.kodza-split__item:focus:not(#_) {
  outline: none;
}

.kodza-split__item[aria-disabled="true"]:not(#_) {
  color: var(--kz-split-menu-muted);
  cursor: not-allowed;
}

.kodza-split__item[role="menuitemradio"]:not(#_) {
  padding-left: 32px;
}

.kodza-split__item[aria-checked="true"]:not(#_)::before {
  content: "";
  position: absolute;
  left: 10px;
  width: 14px;
  height: 14px;
  background: currentColor;
  -webkit-mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Cpath d='M3 8.5l3.2 3L13 4.5' fill='none' stroke='black' stroke-width='1.8' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center / contain no-repeat;
  mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Cpath d='M3 8.5l3.2 3L13 4.5' fill='none' stroke='black' stroke-width='1.8' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center / contain no-repeat;
}

.kodza-split__hint:where(kbd):not(#_) {
  font-family: ui-monospace, "SF Mono", Menlo, monospace;
  font-size: 12px;
  font-weight: 400;
  color: var(--kz-split-menu-muted);
}

@media (prefers-reduced-motion: reduce) {
  .kodza-split__chevron: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 — Split Button
// Slides the hover tint from half to half, opens and closes the menu of the arrow (click,
// Enter, Space, arrows), moves the focus and the highlight from item to item (arrows, Home,
// End, first letter), and closes on Escape, Tab or a click outside. Picking an item fires
// "kodza:select" with { item, value } on the split button; a way of doing the main action
// (menuitemradio) also becomes the main button's label and value, so its own click does that.
(() => {
  const SELECTOR = '.kodza-split';
  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 main = root.querySelector('.kodza-split__main');
    const toggle = root.querySelector('.kodza-split__toggle');
    const menu = root.querySelector('.kodza-split__menu');
    if (!main || !toggle || !menu) return;
    const label = main.querySelector('.kodza-split__label');
    const items = [...menu.querySelectorAll('.kodza-split__item')];
    const tint = document.createElement('span');
    tint.className = 'kodza-split__tint';
    tint.setAttribute('aria-hidden', 'true');
    root.prepend(tint);
    const highlight = document.createElement('span');
    highlight.className = 'kodza-split__highlight';
    highlight.setAttribute('aria-hidden', 'true');
    menu.prepend(highlight);
    items.forEach((item) => (item.tabIndex = -1));
    if (label) label.replaceChildren(Object.assign(document.createElement('span'), { textContent: label.textContent.trim() }));

    const isOpen = () => root.classList.contains('is-open');
    const valueOf = (item) => item.value || item.firstChild.textContent.trim();

    // The tint: placed at once the first time, then it glides from half to half
    let tinted = null;
    // (edges measured from the tint's own box, 4px inside the button; 3px of air at the line)
    const place = (half) => {
      const inner = root.clientWidth - 8;
      const left = half === main ? 0 : toggle.offsetLeft + 3 - 4;
      const right = half === main ? inner - (main.offsetWidth - 3 - 4) : 0;
      root.style.setProperty('--kz-split-tint-l', `${left}px`);
      root.style.setProperty('--kz-split-tint-r', `${right}px`);
    };
    const tintOn = (half) => {
      if (half.disabled) return tintOff();
      if (!tinted) {
        root.classList.remove('is-gliding');
        place(half);
        void getComputedStyle(tint).clipPath;
        root.classList.add('is-gliding');
      } else {
        place(half);
      }
      root.style.setProperty('--kz-split-tint-on', 1);
      tinted = half;
    };
    const tintOff = () => {
      root.style.setProperty('--kz-split-tint-on', 0);
      tinted = null;
    };
    // Its edges follow the button when its width changes (a new label, a narrower column)
    if (window.ResizeObserver) {
      const watch = new ResizeObserver(() => tinted && place(tinted));
      watch.observe(root);
      signal.addEventListener('abort', () => watch.disconnect());
    }

    // A new way of doing it rolls into the main button: the old words leave upwards, the new
    // ones rise, and the button eases to its new width instead of jumping
    let rolls = 0;
    const roll = (text) => {
      const prev = label.lastElementChild;
      if (!prev || prev.textContent === text) return;
      const from = label.offsetWidth;
      const span = Object.assign(document.createElement('span'), { textContent: text });
      label.append(span);
      if (reduceMotion) return prev.remove();
      const to = span.offsetWidth;
      const timing = { duration: 450, delay: 280, easing: 'cubic-bezier(0.22, 1, 0.36, 1)' };
      prev.setAttribute('aria-hidden', 'true');
      // (held at its end until the old words are gone: the grid would be as wide as both for a frame.
      // Wider, it opens ahead of the new words so they are not cut on the way in; narrower, it
      // eases in and out so the old ones are not cut before they have left)
      const fitTiming = to > from
        ? { duration: 300, delay: 140, easing: 'cubic-bezier(0.22, 1, 0.36, 1)' }
        : { ...timing, easing: 'cubic-bezier(0.65, 0, 0.35, 1)' };
      const fit = label.animate([{ width: `${from}px` }, { width: `${to}px` }], { ...fitTiming, fill: 'both' });
      // The tint stays tied to its half while the arrow moves: no glide of its own meanwhile
      root.classList.remove('is-gliding');
      const id = ++rolls;
      const done = () => {
        prev.remove();
        fit.cancel();
        if (id === rolls && !signal.aborted) root.classList.add('is-gliding');
      };
      prev.animate([{ transform: 'none' }, { transform: 'translateY(-110%)' }], { ...timing, fill: 'forwards' }).finished.then(done, done);
      span.animate([{ transform: 'translateY(110%)' }, { transform: 'none' }], { ...timing, fill: 'backwards' });
    };

    const light = (item) => {
      if (!item) {
        menu.style.setProperty('--kz-hl-on', 0);
        return;
      }
      menu.style.setProperty('--kz-hl-y', `${item.offsetTop}px`);
      menu.style.setProperty('--kz-hl-h', `${item.offsetHeight}px`);
      menu.style.setProperty('--kz-hl-on', 1);
    };

    const focusItem = (item) => {
      if (!item) return;
      item.focus({ preventScroll: true });
      light(item);
    };

    const open = (which = 'none') => {
      if (!isOpen()) {
        const box = root.getBoundingClientRect();
        const height = menu.offsetHeight + 8;
        const above = box.bottom + height > innerHeight - 8 && box.top - height > 8;
        // A closed menu that changes side gets there at once, so it always unrolls from the button
        if (above !== root.classList.contains('is-above')) {
          menu.style.transition = 'none';
          root.classList.toggle('is-above', above);
          void menu.offsetWidth;
          menu.style.transition = '';
        }
        // Under the arrow, its right edges lined up; no room on the left: from the button's left
        // edge, moved back in if it would cross the right edge of the screen. Screen pixels
        // divided by the button's scale (a parent enlarged by transform)
        const scale = box.width / root.offsetWidth || 1;
        const width = menu.offsetWidth * scale;
        const start = box.right - width < 8;
        root.classList.toggle('is-start', start);
        // (the page's width, not innerWidth: on a phone it grows with whatever overflows)
        const over = start ? Math.max(0, box.left + width - (document.documentElement.clientWidth - 8)) : 0;
        root.style.setProperty('--kz-split-shift', `${-Math.min(over, Math.max(0, box.left - 8)) / scale}px`);
        root.classList.add('is-open');
        toggle.setAttribute('aria-expanded', 'true');
        tintOn(toggle);
      }
      const checked = items.find((item) => item.getAttribute('aria-checked') === 'true');
      if (which === 'first') focusItem(checked || items[0]);
      else if (which === 'last') focusItem(items[items.length - 1]);
      else light(null);
    };

    const close = (refocus = false) => {
      if (!isOpen()) return;
      root.classList.remove('is-open', 'is-picking');
      toggle.setAttribute('aria-expanded', 'false');
      light(null);
      if (refocus) toggle.focus();
      // The tint goes to the half under the pointer, or leaves with it
      const under = [main, toggle].find((half) => half.matches(':hover'));
      if (under) tintOn(under);
      else if (!root.matches(':hover')) tintOff();
    };

    const pick = (item) => {
      if (item.getAttribute('aria-disabled') === 'true') return;
      const value = valueOf(item);
      if (item.getAttribute('role') === 'menuitemradio') {
        items.forEach((other) => other.getAttribute('role') === 'menuitemradio' && other.setAttribute('aria-checked', String(other === item)));
        if (label) roll(item.firstChild.textContent.trim());
        main.value = value;
      }
      root.dispatchEvent(new CustomEvent('kodza:select', { detail: { item, value }, bubbles: true }));
      light(item);
      root.classList.add('is-picking');
      setTimeout(() => !signal.aborted && close(true), reduceMotion ? 0 : 320);
    };

    [main, toggle].forEach((half) => half.addEventListener('pointerenter', () => tintOn(isOpen() ? toggle : half), { signal }));
    root.addEventListener('pointerleave', () => !isOpen() && tintOff(), { signal });
    menu.addEventListener('pointerenter', () => tintOn(toggle), { signal });

    toggle.addEventListener('click', () => (isOpen() ? close() : open()), { signal });
    toggle.addEventListener('keydown', (event) => {
      if (['ArrowDown', 'Enter', ' '].includes(event.key)) {
        event.preventDefault();
        open('first');
      } else if (event.key === 'ArrowUp') {
        event.preventDefault();
        open('last');
      }
    }, { signal });

    items.forEach((item) => {
      item.addEventListener('click', () => pick(item), { signal });
      item.addEventListener('pointermove', () => document.activeElement !== item && focusItem(item), { signal });
    });
    menu.addEventListener('pointerleave', () => {
      if (menu.contains(document.activeElement)) menu.focus({ preventScroll: true });
      light(null);
    }, { signal });

    menu.addEventListener('keydown', (event) => {
      const index = items.indexOf(document.activeElement);
      const moves = { ArrowDown: index + 1, ArrowUp: index - 1, Home: 0, End: items.length - 1 };
      if (event.key in moves) {
        event.preventDefault();
        focusItem(items[(moves[event.key] + items.length) % items.length]);
      } else if (event.key === 'Escape') {
        event.preventDefault();
        close(true);
      } else if (event.key === 'Tab') {
        close();
      } else if (event.key.length === 1 && /\S/.test(event.key)) {
        // Type a letter: jump to the next item that starts with it
        const letter = event.key.toLowerCase();
        const order = [...items.slice(index + 1), ...items.slice(0, index + 1)];
        focusItem(order.find((item) => item.textContent.trim().toLowerCase().startsWith(letter)));
      }
    }, { signal });

    // (the main half is inside the root too: doing the action closes the menu as well)
    document.addEventListener('pointerdown', (event) => {
      if (isOpen() && (!root.contains(event.target) || main.contains(event.target))) close();
    }, { signal });
    // Escape closes it wherever the focus is: opened with a click, it stays on the arrow
    // (Chrome) or on the page (Safari), not in the menu
    document.addEventListener('keydown', (event) => {
      if (event.key !== 'Escape' || !isOpen()) return;
      event.preventDefault();
      close(true);
    }, { signal });

    menu.tabIndex = -1;
  }

  // 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 — Split Button, for React. From https://kodza.dev/components/split-button/
// 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: split-button.css and split-button.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 './split-button.css';

type Variant = "outline";

export type SplitButtonProps = Omit<ComponentPropsWithoutRef<'div'>, "children" | "variant" | "vars" | "onSelect"> & {
  /** Modifier class(es): .kodza-split--outline */
  variant?: Variant | Variant[];
  /** Settings, as CSS variables on the root */
  vars?: {
    /** default: #0a0a0a */
    "--kz-split-bg"?: string | number;
    /** default: #ffffff */
    "--kz-split-fg"?: string | number;
    /** default: transparent */
    "--kz-split-border"?: string | number;
    /** default: rgba(255, 255, 255, 0.22) */
    "--kz-split-divider"?: string | number;
    /** the hover, under one half — default: rgba(255, 255, 255, 0.14) */
    "--kz-split-tint"?: string | number;
    /** default: 52px */
    "--kz-split-height"?: string | number;
    /** default: 24px */
    "--kz-split-pad-x"?: string | number;
    /** the arrow's half — default: 50px */
    "--kz-split-toggle"?: string | number;
    /** default: #ffffff */
    "--kz-split-menu-bg"?: string | number;
    /** default: #0a0a0a */
    "--kz-split-menu-fg"?: string | number;
    /** default: rgba(10, 10, 10, 0.58) */
    "--kz-split-menu-muted"?: string | number;
    /** default: rgba(10, 10, 10, 0.1) */
    "--kz-split-menu-border"?: string | number;
    /** default: rgba(10, 10, 10, 0.06) */
    "--kz-split-menu-soft"?: string | number;
    /** default: 0 18px 40px -16px rgba(10, 10, 10, 0.3) */
    "--kz-split-menu-shadow"?: string | number;
    /** default: 240px */
    "--kz-split-menu-width"?: string | number;
    /** default: 0.35s */
    "--kz-split-duration"?: string | number;
    /** default: cubic-bezier(0.22, 1, 0.36, 1) */
    "--kz-split-ease"?: string | number;
  };
  /** "kodza:select", fired by the script (bubbles from the root) */
  onSelect?: (event: CustomEvent) => void;
  className?: string;
};

export function SplitButton({ variant, vars, onSelect, className, style, ...rest }: SplitButtonProps) {
  const ref = useRef<ComponentRef<'div'>>(null);
  const classes = ["kodza-split", ...([] as string[]).concat(variant ?? []).map((v) => `kodza-split--${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('./split-button.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 || !onSelect) return;
    const listener = (event: Event) => onSelect(event as CustomEvent);
    root.addEventListener("kodza:select", listener);
    return () => root.removeEventListener("kodza:select", listener);
  }, [onSelect, key]);

  return (
    <div role="group" aria-label="Merge" key={key} {...rest} className={classes} style={{ ...vars, ...style } as CSSProperties} ref={ref}>
      <button className="kodza-split__main" type="button" value="merge">
        <span className="kodza-split__label">Merge pull request</span>
      </button>
      {' '}
      <button className="kodza-split__toggle" type="button" aria-haspopup="menu" aria-expanded="false" aria-label="More ways to merge">
        <svg className="kodza-split__chevron" viewBox="0 0 16 16" aria-hidden="true">
          <path d="M4 6.5 8 10.5l4-4" fill="none" stroke="currentColor" strokeWidth="1.6" strokeLinecap="round" strokeLinejoin="round" />
        </svg>
      </button>
      <div className="kodza-split__menu" role="menu" aria-label="Ways to merge">
        <button className="kodza-split__item" type="button" role="menuitemradio" aria-checked="true" value="merge">Merge pull request <span className="kodza-split__hint">every commit</span></button>
        {' '}
        <button className="kodza-split__item" type="button" role="menuitemradio" aria-checked="false" value="squash">{"Squash & merge "}<span className="kodza-split__hint">one tidy commit</span></button>
        {' '}
        <button className="kodza-split__item" type="button" role="menuitemradio" aria-checked="false" value="rebase">Rebase <span className="kodza-split__hint">history, rewritten</span></button>
      </div>
    </div>
  );
}