Bootstrap 5 Expandable Search Bar

<section class="wdw-stage">
  <div class="container" style="max-width:680px">
    <div class="mb-4 text-center">
      <span class="wdw-eyebrow">Search</span>
      <h2 class="wdw-heading h2 mb-1">What are you looking for?</h2>
      <p class="wdw-muted mb-0">Click the icon to expand the field. Press <kbd>/</kbd> to focus, <kbd>Esc</kbd> to collapse.</p>
    </div>
    <div class="wdw-aurora rounded-5 p-4 p-md-5 xs-panel">
      <div class="xs-demo">
        <p class="small fw-semibold opacity-75 mb-2">Collapsed: expands on click</p>
        <form class="xs position-relative" role="search" data-xs>
          <label for="xsInput1" class="visually-hidden">Search</label>
          <input id="xsInput1" class="xs-input" type="search" role="combobox" aria-expanded="false" aria-controls="xsList1" aria-autocomplete="list" placeholder="Search articles, docs, people" autocomplete="off" tabindex="-1">
          <button type="button" class="xs-btn" aria-label="Search" aria-expanded="false" aria-controls="xsInput1">
            <svg width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.25" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><circle cx="11" cy="11" r="7"/><path d="m20 20-3.5-3.5"/></svg>
          </button>
          <div class="xs-pop wdw-card-sm" hidden>
            <p class="wdw-eyebrow px-3 pt-3 mb-1">Popular searches</p>
            <ul class="list-group list-group-flush rounded-bottom-4" id="xsList1" role="listbox" aria-label="Suggestions">
              <li class="list-group-item list-group-item-action" role="option" tabindex="-1">Bootstrap 5 navbar</li>
              <li class="list-group-item list-group-item-action" role="option" tabindex="-1">Dark mode toggle</li>
              <li class="list-group-item list-group-item-action" role="option" tabindex="-1">Pricing table</li>
            </ul>
          </div>
        </form>
      </div>
      <div class="xs-gap"></div>
      <div class="xs-demo">
        <p class="small fw-semibold opacity-75 mb-2">Expanded: inline search</p>
        <form class="xs is-open position-relative" role="search" data-xs>
          <label for="xsInput2" class="visually-hidden">Search</label>
          <input id="xsInput2" class="xs-input" type="search" role="combobox" aria-expanded="false" aria-controls="xsList2" aria-autocomplete="list" placeholder="Search articles, docs, people" autocomplete="off">
          <button type="button" class="xs-btn" aria-label="Search" aria-expanded="true" aria-controls="xsInput2">
            <svg width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.25" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><circle cx="11" cy="11" r="7"/><path d="m20 20-3.5-3.5"/></svg>
          </button>
          <div class="xs-pop wdw-card-sm" hidden>
            <p class="wdw-eyebrow px-3 pt-3 mb-1">Popular searches</p>
            <ul class="list-group list-group-flush rounded-bottom-4" id="xsList2" role="listbox" aria-label="Suggestions">
              <li class="list-group-item list-group-item-action" role="option" tabindex="-1">Bootstrap 5 navbar</li>
              <li class="list-group-item list-group-item-action" role="option" tabindex="-1">Dark mode toggle</li>
              <li class="list-group-item list-group-item-action" role="option" tabindex="-1">Pricing table</li>
            </ul>
          </div>
        </form>
      </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 */
.xs-panel { box-shadow: var(--wdw-shadow); min-height: 22rem; }
.xs-gap { height: 2.5rem; }
.xs { position: relative; height: 56px; width: 56px; max-width: 100%; transition: width .4s cubic-bezier(.3,.8,.3,1); background: rgba(255,255,255,.14); border: 1px solid rgba(255,255,255,.35); border-radius: 999px; backdrop-filter: blur(8px); }
.xs.is-open { width: min(100%, 520px); background: var(--bs-body-bg); border-color: var(--bs-body-bg); box-shadow: 0 16px 40px -12px rgba(0,0,0,.45); }
.xs-input { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; background: transparent; padding: 0 64px 0 1.5rem; font-size: 1rem; color: var(--bs-body-color); border-radius: 999px; opacity: 0; visibility: hidden; pointer-events: none; transition: opacity .2s, visibility 0s .4s; }
.xs.is-open .xs-input { opacity: 1; visibility: visible; pointer-events: auto; transition: opacity .2s .15s, visibility 0s; }
.xs-input:focus { outline: 0; box-shadow: none; }
.xs-input::placeholder { color: var(--bs-secondary-color); }
.xs-btn { position: absolute; top: 4px; right: 4px; width: 46px; height: 46px; border: 0; border-radius: 50%; display: inline-flex; align-items: center; justify-content: center; background: transparent; color: #fff; transition: background .2s, color .2s; }
.xs.is-open .xs-btn { background: var(--bs-primary); color: var(--bs-btn-color, #fff); }
[data-bs-theme="dark"] .xs.is-open .xs-btn { color: var(--bs-black); }
.xs-btn:focus-visible { outline: 3px solid var(--bs-primary-border-subtle); outline-offset: 2px; }
.xs-pop { position: absolute; top: calc(100% + .5rem); left: 0; right: 0; z-index: 5; overflow: hidden; color: var(--bs-body-color); }
.xs-pop .list-group-item { cursor: pointer; border-color: var(--bs-border-color-translucent); }
.xs-pop .list-group-item.is-active, .xs-pop .list-group-item:hover { background: var(--bs-primary-bg-subtle); color: var(--bs-primary-text-emphasis); }
@media (prefers-reduced-motion: reduce) { .xs, .xs-input { transition: none; } }

(function initExpandableSearch() {
  var forms = document.querySelectorAll('[data-xs]');
  if (!forms.length) return;
  forms.forEach(function (form) {
    var input = form.querySelector('.xs-input');
    var btn = form.querySelector('.xs-btn');
    var pop = form.querySelector('.xs-pop');
    var opts = form.querySelectorAll('[role="option"]');
    var idx = -1;
    function showPop(show) {
      pop.hidden = !show;
      input.setAttribute('aria-expanded', String(show));
      if (!show) setActive(-1);
    }
    function setActive(i) {
      idx = i;
      opts.forEach(function (o, n) { o.classList.toggle('is-active', n === i); o.setAttribute('aria-selected', String(n === i)); });
      if (i >= 0) input.setAttribute('aria-activedescendant', opts[i].id); else input.removeAttribute('aria-activedescendant');
    }
    opts.forEach(function (o, n) {
      o.id = input.id + 'Opt' + n;
      o.addEventListener('mousedown', function (e) { e.preventDefault(); });
      o.addEventListener('click', function () { input.value = o.textContent; showPop(false); input.focus(); });
    });
    function setOpen(open) {
      form.classList.toggle('is-open', open);
      btn.setAttribute('aria-expanded', String(open));
      input.tabIndex = open ? 0 : -1;
      if (open) input.focus(); else showPop(false);
    }
    btn.addEventListener('click', function () {
      var open = form.classList.contains('is-open');
      if (open && input.value) { form.requestSubmit ? form.requestSubmit() : form.dispatchEvent(new Event('submit', { cancelable: true })); return; }
      setOpen(!open);
    });
    form.addEventListener('submit', function (e) { e.preventDefault(); showPop(false); });
    input.addEventListener('focus', function () { showPop(true); });
    input.addEventListener('input', function () { showPop(true); });
    input.addEventListener('focusout', function () {
      setTimeout(function () {
        if (!form.contains(document.activeElement) && !input.value) setOpen(false);
        else if (!form.contains(document.activeElement)) showPop(false);
      }, 100);
    });
    input.addEventListener('keydown', function (e) {
      if (e.key === 'Escape') { input.value = ''; setOpen(false); btn.focus(); }
      else if (e.key === 'ArrowDown') { e.preventDefault(); showPop(true); setActive((idx + 1) % opts.length); }
      else if (e.key === 'ArrowUp') { e.preventDefault(); setActive((idx - 1 + opts.length) % opts.length); }
      else if (e.key === 'Enter' && idx >= 0) { e.preventDefault(); input.value = opts[idx].textContent; showPop(false); }
    });
  });
  document.addEventListener('keydown', function (e) {
    if (e.key !== '/' || e.ctrlKey || e.metaKey || e.altKey) return;
    var a = document.activeElement;
    if (a && (/INPUT|TEXTAREA|SELECT/.test(a.tagName) || a.isContentEditable)) return;
    e.preventDefault();
    forms[0].querySelector('.xs-btn').click();
  });
})();