Bootstrap 5 Gooey Floating Menu with SVG Filter

<section class="wdw-stage">
  <div class="container" style="max-width: 640px;">
    <div class="wdw-card overflow-hidden" id="goo-app">
      <div class="wdw-aurora goo-screen text-center">
        <span class="wdw-eyebrow text-white-50">Navigation</span>
        <h2 class="wdw-heading h3 mb-1 text-white">Gooey menu</h2>
        <p class="mb-0 text-white-50">Tap the button and the actions pour out.</p>
        <svg width="0" height="0" style="position:absolute" aria-hidden="true" focusable="false">
          <defs><filter id="goo"><feGaussianBlur in="SourceGraphic" stdDeviation="8" result="blur"/><feColorMatrix in="blur" values="1 0 0 0 0  0 1 0 0 0  0 0 1 0 0  0 0 0 20 -9" result="goo"/><feComposite in="SourceGraphic" in2="goo" operator="atop"/></filter></defs>
        </svg>
        <nav class="goo" id="goo-menu" aria-label="Quick actions">
          <div class="goo-blobs" aria-hidden="true">
        <span class="goo-blob" style="--i:1;--o:-2"></span>
        <span class="goo-blob" style="--i:2;--o:-1"></span>
        <span class="goo-blob" style="--i:3;--o:1"></span>
        <span class="goo-blob" style="--i:4;--o:2"></span>
            <span class="goo-blob goo-blob-main"></span>
          </div>
          <div class="goo-links" id="goo-links" inert>
          <a href="#" class="goo-item" style="--i:1;--o:-2"><svg viewBox="0 0 24 24" width="28" height="28" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="M3 11l9-8 9 8M5 10v10h14V10"/></svg><span class="visually-hidden">Home</span><span class="goo-label" aria-hidden="true">Home</span></a>
          <a href="#" class="goo-item" style="--i:2;--o:-1"><svg viewBox="0 0 24 24" width="28" height="28" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><circle cx="11" cy="11" r="7"/><path d="m21 21-4.3-4.3"/></svg><span class="visually-hidden">Search</span><span class="goo-label" aria-hidden="true">Search</span></a>
          <a href="#" class="goo-item" style="--i:3;--o:1"><svg viewBox="0 0 24 24" width="28" height="28" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="M4 5h16v12H8l-4 4z"/></svg><span class="visually-hidden">Messages</span><span class="goo-label" aria-hidden="true">Messages</span></a>
          <a href="#" class="goo-item" style="--i:4;--o:2"><svg viewBox="0 0 24 24" width="28" height="28" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><circle cx="12" cy="8" r="4"/><path d="M4 21c1-4 4-6 8-6s7 2 8 6"/></svg><span class="visually-hidden">Profile</span><span class="goo-label" aria-hidden="true">Profile</span></a>
          </div>
          <button type="button" class="goo-toggle" aria-expanded="false" aria-controls="goo-links" aria-label="Open menu"><span></span><span></span><span></span></button>
        </nav>
      </div>
    </div>
  </div>
</section>

/* Web Designer Wall library style — shared base for every Bootstrap 5 snippet.
   Indigo accent, Plus Jakarta Sans, soft cards, pill buttons. Works in light and dark. */
@import url("https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@400;500;600;700;800&display=swap");

:root,
[data-bs-theme="light"] {
  --wdw-font: "Plus Jakarta Sans", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --bs-body-font-family: var(--wdw-font);
  --bs-primary: #4f46e5;
  --bs-primary-rgb: 79, 70, 229;
  --bs-primary-text-emphasis: #3730a3;
  --bs-primary-bg-subtle: #eef2ff;
  --bs-primary-border-subtle: #c7d2fe;
  --bs-link-color: #4f46e5;
  --bs-link-color-rgb: 79, 70, 229;
  --bs-link-hover-color: #4338ca;
  --bs-link-hover-color-rgb: 67, 56, 202;
  --bs-focus-ring-color: rgba(79, 70, 229, 0.25);
  --bs-border-radius: 0.75rem;
  --bs-border-radius-lg: 1rem;
  --bs-border-radius-xl: 1.25rem;
  --wdw-radius-card: 1.25rem;
  --wdw-shadow: 0 1px 2px rgba(16, 24, 40, 0.05), 0 16px 40px -16px rgba(16, 24, 40, 0.22);
  --wdw-shadow-sm: 0 1px 2px rgba(16, 24, 40, 0.06), 0 4px 12px -4px rgba(16, 24, 40, 0.12);
  --wdw-stage: #f5f6fb;
}

[data-bs-theme="dark"] {
  --bs-primary: #818cf8;
  --bs-primary-rgb: 129, 140, 248;
  --bs-primary-text-emphasis: #c7d2fe;
  --bs-primary-bg-subtle: rgba(129, 140, 248, 0.14);
  --bs-primary-border-subtle: rgba(129, 140, 248, 0.35);
  --bs-link-color: #a5b4fc;
  --bs-link-color-rgb: 165, 180, 252;
  --bs-link-hover-color: #c7d2fe;
  --bs-link-hover-color-rgb: 199, 210, 254;
  --bs-focus-ring-color: rgba(129, 140, 248, 0.35);
  --wdw-shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 16px 40px -16px rgba(0, 0, 0, 0.7);
  --wdw-shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4), 0 4px 12px -4px rgba(0, 0, 0, 0.5);
  --wdw-stage: #0f1117;
}

body { font-family: var(--wdw-font); -webkit-font-smoothing: antialiased; }

/* Bootstrap compiles its blue into these components; point them at the accent. */
.btn-primary {
  --bs-btn-bg: var(--bs-primary); --bs-btn-border-color: var(--bs-primary);
  --bs-btn-hover-bg: #4338ca; --bs-btn-hover-border-color: #4338ca;
  --bs-btn-active-bg: #3730a3; --bs-btn-active-border-color: #3730a3;
  --bs-btn-disabled-bg: var(--bs-primary); --bs-btn-disabled-border-color: var(--bs-primary);
  --bs-btn-focus-shadow-rgb: var(--bs-primary-rgb);
}
[data-bs-theme="dark"] .btn-primary { --bs-btn-color: #0f1117; --bs-btn-hover-bg: #a5b4fc; --bs-btn-hover-border-color: #a5b4fc; --bs-btn-hover-color: #0f1117; --bs-btn-active-color: #0f1117; }
.btn-outline-primary {
  --bs-btn-color: var(--bs-primary); --bs-btn-border-color: var(--bs-primary);
  --bs-btn-hover-bg: var(--bs-primary); --bs-btn-hover-border-color: var(--bs-primary);
  --bs-btn-active-bg: var(--bs-primary); --bs-btn-active-border-color: var(--bs-primary);
  --bs-btn-focus-shadow-rgb: var(--bs-primary-rgb);
}
.btn { --bs-btn-font-weight: 600; min-height: 44px; display: inline-flex; align-items: center; justify-content: center; gap: .5rem; }
.btn-sm { min-height: 36px; }
.form-control, .form-select { min-height: 44px; border-radius: .75rem; }
.form-control:focus, .form-select:focus, .form-check-input:focus { border-color: rgba(var(--bs-primary-rgb), .6); box-shadow: 0 0 0 .25rem var(--bs-focus-ring-color); }
.form-check-input:checked { background-color: var(--bs-primary); border-color: var(--bs-primary); }
.nav-pills { --bs-nav-pills-link-active-bg: var(--bs-primary); }
.nav { --bs-nav-link-color: var(--bs-secondary-color); --bs-nav-link-hover-color: var(--bs-emphasis-color); }
.pagination { --bs-pagination-active-bg: var(--bs-primary); --bs-pagination-active-border-color: var(--bs-primary); --bs-pagination-color: var(--bs-body-color); --bs-pagination-focus-box-shadow: 0 0 0 .25rem var(--bs-focus-ring-color); }
.progress, .progress-stacked { --bs-progress-bar-bg: var(--bs-primary); }
.list-group { --bs-list-group-active-bg: var(--bs-primary); --bs-list-group-active-border-color: var(--bs-primary); }
.dropdown-menu { --bs-dropdown-link-active-bg: var(--bs-primary); border-radius: .875rem; box-shadow: var(--wdw-shadow-sm); }
.accordion { --bs-accordion-active-bg: var(--bs-primary-bg-subtle); --bs-accordion-active-color: var(--bs-primary-text-emphasis); --bs-accordion-btn-focus-box-shadow: 0 0 0 .25rem var(--bs-focus-ring-color); }
.badge { font-weight: 600; }

/* Library building blocks — use these instead of re-inventing them per snippet. */
.wdw-stage { min-height: 100vh; display: flex; align-items: center; background: var(--wdw-stage); padding-block: 3rem; }
.wdw-card { background: var(--bs-body-bg); border: 1px solid var(--bs-border-color-translucent); border-radius: var(--wdw-radius-card); box-shadow: var(--wdw-shadow); }
.wdw-card-sm { background: var(--bs-body-bg); border: 1px solid var(--bs-border-color-translucent); border-radius: 1rem; box-shadow: var(--wdw-shadow-sm); }
.wdw-aurora { position: relative; color: #fff; background: radial-gradient(60% 55% at 100% 0, #818cf8 0, transparent 70%), radial-gradient(65% 60% at 0 100%, #ec4899 0, transparent 65%), #1e1b4b; }
.wdw-eyebrow { display: inline-block; font-size: .75rem; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--bs-primary); }
.wdw-heading { font-weight: 800; letter-spacing: -.02em; color: var(--bs-emphasis-color); }
.wdw-muted { color: var(--bs-secondary-color); }
.wdw-icon { width: 2.75rem; height: 2.75rem; flex: none; display: inline-flex; align-items: center; justify-content: center; border-radius: .875rem; background: var(--bs-primary-bg-subtle); color: var(--bs-primary); }

/* Component */
#goo-app .goo-screen { min-height: 400px; padding: 3rem 1.5rem 0; position: relative; }
.goo { position: absolute; left: 0; right: 0; bottom: 3.25rem; height: 76px; --d: 84px; --s: 76px; }
.goo-blobs, .goo-links { position: absolute; inset: 0; }
.goo-blobs { filter: url("#goo"); }
.goo-blob, .goo-item, .goo-toggle { position: absolute; left: 50%; top: 0; width: var(--s); height: var(--s); margin-left: calc(var(--s) / -2); border-radius: 50%; }
.goo-blob { background: var(--bs-body-bg); transform: scale(.8); transition: transform .5s cubic-bezier(.3,1.3,.5,1); }
.goo-blob-main { transform: none; }
.goo-item, .goo-toggle { border: 0; background: transparent; color: var(--bs-primary-text-emphasis); display: flex; align-items: center; justify-content: center; text-decoration: none; }
.goo-item { transform: scale(.8); transition: transform .5s cubic-bezier(.3,1.3,.5,1); }
.goo-item svg { opacity: 0; transition: opacity .2s; }
.goo-toggle { z-index: 2; flex-direction: column; gap: 5px; cursor: pointer; }
.goo-toggle span { width: 24px; height: 2.5px; border-radius: 2px; background: currentColor; transition: transform .3s, opacity .2s; }
.goo.is-open .goo-blob:not(.goo-blob-main), .goo.is-open .goo-item { transform: translateX(calc(var(--o) * var(--d))); transition-delay: calc(var(--i) * .05s); }
.goo.is-open .goo-item svg { opacity: 1; transition-delay: .35s; }
.goo.is-open .goo-toggle span:nth-child(1) { transform: translateY(7.5px) rotate(45deg); }
.goo.is-open .goo-toggle span:nth-child(2) { opacity: 0; }
.goo.is-open .goo-toggle span:nth-child(3) { transform: translateY(-7.5px) rotate(-45deg); }
.goo-label { position: absolute; top: calc(100% + .5rem); left: 50%; transform: translateX(-50%); font-size: .75rem; font-weight: 700; color: #fff; opacity: 0; pointer-events: none; transition: opacity .2s; white-space: nowrap; }
.goo-item:hover .goo-label, .goo-item:focus-visible .goo-label, .goo-item.is-active .goo-label { opacity: 1; }
.goo-item.is-active svg { stroke-width: 2.5; }
.goo-toggle:focus-visible, .goo-item:focus-visible { outline: 3px solid #fff; outline-offset: 2px; }
@media (max-width: 420px) { .goo { --d: 66px; --s: 60px; height: 60px; } .goo-item svg { width: 24px; height: 24px; } }
@media (prefers-reduced-motion: reduce) { .goo-item, .goo-blob, .goo-toggle span, .goo-label { transition: none !important; } }

(function () {
  function initGooMenu() {
    var nav = document.getElementById('goo-menu');
    if (!nav) return;
    var btn = nav.querySelector('.goo-toggle');
    var links = nav.querySelector('.goo-links');
    var items = Array.prototype.slice.call(nav.querySelectorAll('.goo-item'));
    function set(open) {
      nav.classList.toggle('is-open', open);
      btn.setAttribute('aria-expanded', open);
      btn.setAttribute('aria-label', open ? 'Close menu' : 'Open menu');
      links.inert = !open;
      links.setAttribute('aria-hidden', open ? 'false' : 'true');
      if (!open) items.forEach(function (a) { a.setAttribute('tabindex', '-1'); });
      else items.forEach(function (a) { a.removeAttribute('tabindex'); });
    }
    set(false);
    btn.addEventListener('click', function () { set(!nav.classList.contains('is-open')); });
    nav.addEventListener('keydown', function (e) {
      if (e.key === 'Escape' && nav.classList.contains('is-open')) { set(false); btn.focus(); return; }
      var i = items.indexOf(document.activeElement);
      if (i < 0) return;
      if (e.key === 'ArrowRight') { e.preventDefault(); items[(i + 1) % items.length].focus(); }
      if (e.key === 'ArrowLeft') { e.preventDefault(); items[(i - 1 + items.length) % items.length].focus(); }
    });
    items.forEach(function (a) {
      a.addEventListener('click', function (e) {
        e.preventDefault();
        items.forEach(function (x) { x.classList.toggle('is-active', x === a); });
      });
    });
    if ('IntersectionObserver' in window) {
      var io = new IntersectionObserver(function (entries) {
        if (entries[0].isIntersecting) { io.disconnect(); setTimeout(function () { set(true); items[0].classList.add('is-active'); }, 500); }
      }, { threshold: 0.5 });
      io.observe(nav);
    } else { set(true); }
  }
  initGooMenu();
})();