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    <h1>Dropdown menu morph</h1>
    <p class="lede">Button morphs into a menu surface</p>
    <div class="cta-row">
      <a class="btn btn--primary" href="/detail.html?t=dropdown-menu-morph">Open the live demo</a>
      <a class="btn btn--secondary" href="/skill.html">Install with the Skill</a>
    </div>
    <h2>CSS</h2>
    <p>Namespaced classes and motion tokens you can retune. The reduced-motion guard ships with the snippet.</p>
    <pre><code>/* Transitions.dev — Plus to menu morph */

/*
  Usage:
    &lt;div class=&quot;t-morph&quot; data-open=&quot;false&quot;&gt;
      &lt;div class=&quot;t-morph-menu&quot;&gt; … menu items … &lt;/div&gt;
      &lt;button class=&quot;t-morph-plus&quot; aria-expanded=&quot;false&quot;&gt;+&lt;/button&gt;
    &lt;/div&gt;

  Toggle `data-open` on the container (and `aria-expanded`
  on the button). CSS animates the surface size + corner
  radius and cross-fades the plus ↔ menu. Wrap the morph in
  a relatively-positioned anchor sized to the OPEN footprint
  if you want it to grow out of a fixed corner.
*/

:root {
  --morph-open-dur: 350ms;
  --morph-close-dur: 250ms;
  --morph-ease: cubic-bezier(0.34, 1.25, 0.64, 1);
  --morph-close-ease: cubic-bezier(0.22, 1, 0.36, 1);
  --morph-r-closed: 40px;
  --morph-r-open: 20px;
  --morph-fade-dur: 200ms;
  --morph-slide: 40px;
  --morph-rotate: 45deg;
  --morph-scale: 0.97;
  --morph-blur: 2px;
}

/* Closed: a small circular button. Open: a rounded panel.
   Width/height/border-radius animate; the open state uses a
   bouncier ease than the close. */
.t-morph {
  position: relative;
  width: 40px;
  height: 40px;
  border-radius: var(--morph-r-closed);
  overflow: hidden;
  transition:
    width var(--morph-close-dur) var(--morph-close-ease),
    height var(--morph-close-dur) var(--morph-close-ease),
    border-radius var(--morph-close-dur) var(--morph-close-ease);
}
.t-morph[data-open=&quot;true&quot;] {
  width: 183px;
  height: 172px;
  border-radius: var(--morph-r-open);
  transition:
    width var(--morph-open-dur) var(--morph-ease),
    height var(--morph-open-dur) var(--morph-ease),
    border-radius var(--morph-open-dur) var(--morph-ease);
}
/* Plus fades + slides out and the icon rotates into an ×. */
.t-morph-plus {
  position: absolute;
  inset: auto 0 0 auto;
  width: 40px; height: 40px;
  display: grid; place-items: center;
  border: 0; background: transparent; cursor: pointer;
  transition:
    opacity var(--morph-fade-dur) var(--morph-close-ease),
    transform var(--morph-open-dur) var(--morph-close-ease),
    filter var(--morph-fade-dur) var(--morph-close-ease);
}
.t-morph-plus svg {
  transition: transform var(--morph-open-dur) var(--morph-close-ease);
}
.t-morph[data-open=&quot;true&quot;] .t-morph-plus {
  opacity: 0;
  transform: translateX(calc(-1 * var(--morph-slide)));
  filter: blur(var(--morph-blur));
  pointer-events: none;
}
.t-morph[data-open=&quot;true&quot;] .t-morph-plus svg {
  transform: scale(var(--morph-scale)) rotate(var(--morph-rotate));
}
/* Menu starts slid in + scaled + blurred; reveals on open. */
.t-morph-menu {
  position: absolute;
  inset: 0;
  opacity: 0;
  transform: translateX(var(--morph-slide)) scale(var(--morph-scale));
  filter: blur(var(--morph-blur));
  pointer-events: none;
  transition:
    opacity var(--morph-fade-dur) var(--morph-close-ease),
    transform var(--morph-open-dur) var(--morph-close-ease),
    filter var(--morph-fade-dur) var(--morph-close-ease);
}
.t-morph[data-open=&quot;true&quot;] .t-morph-menu {
  opacity: 1;
  transform: translateX(0) scale(1);
  filter: blur(0);
  pointer-events: auto;
}

@media (prefers-reduced-motion: reduce) {
  .t-morph, .t-morph-plus, .t-morph-menu { transition: none !important; }
}</code></pre>
    <h2>React</h2>
    <p>Self-contained component; the styles inject themselves on first import.</p>
    <pre><code>// Transitions.dev — Plus to menu morph (React, self-contained)
// Drop into any React project — no extra CSS file needed.

import { useEffect, useRef, useState } from &quot;react&quot;;

// ── Styles ──────────────────────────────────────────────
// Auto-injected on first import. Idempotent (guarded by
// the element id) and SSR-safe (no-ops without document).
const __TRANSITION_STYLES = `
:root {
  --morph-open-dur: 350ms;
  --morph-close-dur: 250ms;
  --morph-ease: cubic-bezier(0.34, 1.25, 0.64, 1);
  --morph-close-ease: cubic-bezier(0.22, 1, 0.36, 1);
  --morph-r-closed: 40px;
  --morph-r-open: 20px;
  --morph-fade-dur: 200ms;
  --morph-slide: 40px;
  --morph-rotate: 45deg;
  --morph-scale: 0.97;
  --morph-blur: 2px;
}

/* Closed: a small circular button. Open: a rounded panel.
   Width/height/border-radius animate; the open state uses a
   bouncier ease than the close. */
.t-morph {
  position: relative;
  width: 40px;
  height: 40px;
  border-radius: var(--morph-r-closed);
  overflow: hidden;
  transition:
    width var(--morph-close-dur) var(--morph-close-ease),
    height var(--morph-close-dur) var(--morph-close-ease),
    border-radius var(--morph-close-dur) var(--morph-close-ease);
}
.t-morph[data-open=&quot;true&quot;] {
  width: 183px;
  height: 172px;
  border-radius: var(--morph-r-open);
  transition:
    width var(--morph-open-dur) var(--morph-ease),
    height var(--morph-open-dur) var(--morph-ease),
    border-radius var(--morph-open-dur) var(--morph-ease);
}
/* Plus fades + slides out and the icon rotates into an ×. */
.t-morph-plus {
  position: absolute;
  inset: auto 0 0 auto;
  width: 40px; height: 40px;
  display: grid; place-items: center;
  border: 0; background: transparent; cursor: pointer;
  transition:
    opacity var(--morph-fade-dur) var(--morph-close-ease),
    transform var(--morph-open-dur) var(--morph-close-ease),
    filter var(--morph-fade-dur) var(--morph-close-ease);
}
.t-morph-plus svg {
  transition: transform var(--morph-open-dur) var(--morph-close-ease);
}
.t-morph[data-open=&quot;true&quot;] .t-morph-plus {
  opacity: 0;
  transform: translateX(calc(-1 * var(--morph-slide)));
  filter: blur(var(--morph-blur));
  pointer-events: none;
}
.t-morph[data-open=&quot;true&quot;] .t-morph-plus svg {
  transform: scale(var(--morph-scale)) rotate(var(--morph-rotate));
}
/* Menu starts slid in + scaled + blurred; reveals on open. */
.t-morph-menu {
  position: absolute;
  inset: 0;
  opacity: 0;
  transform: translateX(var(--morph-slide)) scale(var(--morph-scale));
  filter: blur(var(--morph-blur));
  pointer-events: none;
  transition:
    opacity var(--morph-fade-dur) var(--morph-close-ease),
    transform var(--morph-open-dur) var(--morph-close-ease),
    filter var(--morph-fade-dur) var(--morph-close-ease);
}
.t-morph[data-open=&quot;true&quot;] .t-morph-menu {
  opacity: 1;
  transform: translateX(0) scale(1);
  filter: blur(0);
  pointer-events: auto;
}

@media (prefers-reduced-motion: reduce) {
  .t-morph, .t-morph-plus, .t-morph-menu { transition: none !important; }
}
`;
if (typeof document !== &quot;undefined&quot; &amp;&amp; !document.getElementById(&quot;transitions-p20&quot;)) {
  const __style = document.createElement(&quot;style&quot;);
  __style.id = &quot;transitions-p20&quot;;
  __style.textContent = __TRANSITION_STYLES;
  document.head.appendChild(__style);
}

// Pair with the CSS from the CSS tab.
// `data-open` drives the whole morph; CSS handles the size + radius
// animation and the plus ↔ menu cross-fade. Outside click / Escape
// close the menu.
export function PlusMenu({ children }) {
  const ref = useRef(null);
  const [open, setOpen] = useState(false);

  useEffect(() =&gt; {
    if (!open) return;
    const onDown = (e) =&gt; {
      if (ref.current &amp;&amp; !ref.current.contains(e.target)) setOpen(false);
    };
    const onKey = (e) =&gt; { if (e.key === &quot;Escape&quot;) setOpen(false); };
    document.addEventListener(&quot;click&quot;, onDown);
    document.addEventListener(&quot;keydown&quot;, onKey);
    return () =&gt; {
      document.removeEventListener(&quot;click&quot;, onDown);
      document.removeEventListener(&quot;keydown&quot;, onKey);
    };
  }, [open]);

  return (
    &lt;div ref={ref} className=&quot;t-morph&quot; data-open={open ? &quot;true&quot; : &quot;false&quot;}&gt;
      &lt;div className=&quot;t-morph-menu&quot; role=&quot;menu&quot;&gt;{children}&lt;/div&gt;
      &lt;button
        type=&quot;button&quot;
        className=&quot;t-morph-plus&quot;
        aria-expanded={open ? &quot;true&quot; : &quot;false&quot;}
        aria-label=&quot;Open menu&quot;
        onClick={(e) =&gt; { e.stopPropagation(); setOpen((v) =&gt; !v); }}
      &gt;
        &lt;svg width=&quot;20&quot; height=&quot;20&quot; viewBox=&quot;0 0 20 20&quot; fill=&quot;none&quot;&gt;
          &lt;path d=&quot;M10 4V16M4 10H16&quot; stroke=&quot;currentColor&quot; strokeWidth=&quot;1.75&quot; strokeLinecap=&quot;round&quot; /&gt;
        &lt;/svg&gt;
      &lt;/button&gt;
    &lt;/div&gt;
  );
}
</code></pre>
    <div class="related">
      <h2>More transitions</h2>
      <ul>
        <li><a href="/transitions/accordion/">Accordion</a></li>
        <li><a href="/transitions/toast-open-close/">Toast open/close</a></li>
        <li><a href="/transitions/like-button/">Like button</a></li>
        <li><a href="/transitions/learn-more-hover/">Learn more hover</a></li>
        <li><a href="/transitions/checkbox-check/">Checkbox check</a></li>
        <li><a href="/transitions/spinner-to-check-morph/">Spinner to check morph</a></li>
      </ul>
    </div>
    <footer><a href="/transitions/3d-tilt/">&larr; 3D tilt</a> &middot; <a href="/transitions/accordion/">Accordion &rarr;</a></footer>
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