Bootstrap 5 Expandable Search Bar with Suggestions

<section class="wdw-stage wdw-aurora">
  <div class="container text-center" style="max-width: 640px">
    <span class="badge rounded-pill sb-pill mb-3">Docs search</span>
    <h1 class="display-5 fw-bold mb-2" style="letter-spacing:-.03em">What are you looking for?</h1>
    <p class="opacity-75 mb-5">Tap the icon to expand the search. Press Esc to fold it back.</p>

    <form class="sb" id="sb" role="search" autocomplete="off">
      <label class="visually-hidden" for="sbInput">Search</label>
      <button type="button" class="sb-btn" id="sbToggle" aria-label="Open search" aria-expanded="true" aria-controls="sbInput">
        <svg width="22" height="22" viewBox="0 0 24 24" 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="m20 20-3.5-3.5"/></svg>
      </button>
      <input type="search" id="sbInput" class="sb-input" placeholder="Search components and guides" name="q">
      <button type="reset" class="sb-clear" id="sbClear" aria-label="Clear search"><svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.2" stroke-linecap="round" aria-hidden="true"><path d="M6 6l12 12M18 6 6 18"/></svg></button>
      <ul class="sb-list list-unstyled" id="sbList" aria-label="Suggestions">
        <li><a href="#" class="sb-item"><span>Bootstrap 5 pricing table</span><small>Component</small></a></li>
        <li><a href="#" class="sb-item"><span>Responsive navbar with dropdown</span><small>Component</small></a></li>
        <li><a href="#" class="sb-item"><span>Dark mode toggle guide</span><small>Guide</small></a></li>
        <li><a href="#" class="sb-item"><span>Accessible form validation</span><small>Guide</small></a></li>
      </ul>
    </form>
  </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 */
.sb-pill { background: rgba(255,255,255,.14); border: 1px solid rgba(255,255,255,.25); padding: .5rem .85rem; }
.sb { position: relative; width: 100%; max-width: 520px; height: 60px; margin-inline: auto; display: flex; align-items: center; background: #fff; color: #1e1b4b; border-radius: 999px; box-shadow: 0 20px 50px -15px rgba(0,0,0,.5); transition: width .4s cubic-bezier(.3,.9,.3,1), background-color .2s; text-align: left; }
.sb:not(.is-open) { width: 60px; }
.sb-btn { flex: none; width: 60px; height: 60px; border: 0; background: transparent; color: #4f46e5; border-radius: 50%; display: inline-flex; align-items: center; justify-content: center; cursor: pointer; }
.sb-btn:focus-visible, .sb-clear:focus-visible { outline: 3px solid #818cf8; outline-offset: -3px; }
.sb-input { flex: 1; min-width: 0; height: 100%; border: 0; background: transparent; outline: 0; font: inherit; font-size: 1rem; color: #1e1b4b; padding: 0; opacity: 1; transition: opacity .2s .1s; }
.sb-input::placeholder { color: #6b7280; }
.sb-input::-webkit-search-cancel-button { display: none; }
.sb:not(.is-open) .sb-input, .sb:not(.is-open) .sb-clear { opacity: 0; pointer-events: none; width: 0; }
.sb-clear { flex: none; width: 44px; height: 44px; margin-right: 8px; border: 0; border-radius: 50%; background: #eef2ff; color: #4f46e5; display: inline-flex; align-items: center; justify-content: center; cursor: pointer; }
.sb-clear:hover { background: #e0e7ff; }
.sb-list { position: absolute; left: 0; right: 0; top: calc(100% + .6rem); margin: 0; padding: .5rem; background: #fff; border-radius: 1.25rem; box-shadow: 0 20px 50px -15px rgba(0,0,0,.5); opacity: 1; transform: none; transition: opacity .2s, transform .25s; }
.sb:not(.is-open) .sb-list, .sb:not(.has-list) .sb-list { opacity: 0; transform: translateY(-6px); pointer-events: none; visibility: hidden; }
.sb-item { display: flex; align-items: center; justify-content: space-between; gap: 1rem; min-height: 44px; padding: .5rem .9rem; border-radius: .8rem; color: #1e1b4b; text-decoration: none; font-size: .95rem; font-weight: 500; }
.sb-item small { color: #4f46e5; font-weight: 600; background: #eef2ff; border-radius: 999px; padding: .15rem .6rem; }
.sb-item:hover, .sb-item:focus-visible { background: #f5f6fb; }
.sb-item.is-hidden { display: none; }
@media (prefers-reduced-motion: reduce) { .sb, .sb-list, .sb-input { transition: none; } }

(function () {
  var form = document.getElementById('sb');
  if (!form) return;
  var toggle = document.getElementById('sbToggle');
  var input = document.getElementById('sbInput');
  var items = form.querySelectorAll('.sb-item');

  function setOpen(open) {
    form.classList.toggle('is-open', open);
    toggle.setAttribute('aria-expanded', open);
    toggle.setAttribute('aria-label', open ? 'Close search' : 'Open search');
    input.tabIndex = open ? 0 : -1;
    syncList();
    if (open) input.focus();
  }

  function syncList() {
    form.classList.toggle('has-list', form.classList.contains('is-open') && !!form.querySelector('.sb-item:not(.is-hidden)'));
  }

  function initToggle() {
    toggle.addEventListener('click', function () {
      var open = !form.classList.contains('is-open');
      setOpen(open);
      if (!open) form.reset();
    });
    form.addEventListener('keydown', function (e) {
      if (e.key === 'Escape') { setOpen(false); toggle.focus(); }
    });
    form.addEventListener('submit', function (e) { e.preventDefault(); });
  }

  function initFilter() {
    function run() {
      var q = input.value.trim().toLowerCase();
      items.forEach(function (a) {
        a.parentElement.hidden = !!q && a.textContent.toLowerCase().indexOf(q) === -1;
        a.classList.toggle('is-hidden', a.parentElement.hidden);
      });
      syncList();
    }
    input.addEventListener('input', run);
    form.addEventListener('reset', function () { setTimeout(function () { run(); input.focus(); }, 0); });
  }

  form.classList.add('is-open');
  initToggle();
  initFilter();
  syncList();
})();