Bootstrap 5 Navbar with Nested Dropdowns for Education Sites

<section class="wdw-stage">
  <div class="container" style="max-width:980px">
    <nav class="navbar navbar-expand-lg edu-nav wdw-card px-3 px-lg-4" aria-label="Main">
      <a class="navbar-brand d-flex align-items-center gap-2 fw-bold" href="#">
        <span class="wdw-icon" style="width:2.25rem;height:2.25rem;border-radius:.65rem" aria-hidden="true"><svg width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.9" stroke-linecap="round" stroke-linejoin="round"><path d="m2 9 10-5 10 5-10 5z"/><path d="M6 11.5V16c0 1.5 3 3 6 3s6-1.5 6-3v-4.5"/></svg></span>
        Learnly
      </a>
      <button class="navbar-toggler border-0" type="button" data-bs-toggle="collapse" data-bs-target="#eduNav" aria-controls="eduNav" aria-expanded="false" aria-label="Toggle navigation"><span class="navbar-toggler-icon"></span></button>
      <div class="collapse navbar-collapse" id="eduNav">
        <ul class="navbar-nav ms-lg-auto gap-lg-1 align-items-lg-center">
          <li class="nav-item"><a class="nav-link" href="#">Home</a></li>
          <li class="nav-item dropdown">
            <a class="nav-link dropdown-toggle active" href="#" role="button" data-bs-toggle="dropdown" aria-expanded="false" aria-current="page">Tutorials</a>
            <ul class="dropdown-menu p-2">
              <li class="dropend">
                <a class="dropdown-item dropdown-toggle rounded-3" href="#" role="button" data-bs-toggle="dropdown" aria-expanded="false">Design</a>
                <ul class="dropdown-menu p-2">
                  <li><a class="dropdown-item rounded-3" href="#">Color theory</a></li>
                  <li><a class="dropdown-item rounded-3" href="#">Typography</a></li>
                  <li><a class="dropdown-item rounded-3" href="#">Layout & grids</a></li>
                </ul>
              </li>
              <li class="dropend">
                <a class="dropdown-item dropdown-toggle rounded-3" href="#" role="button" data-bs-toggle="dropdown" aria-expanded="false">Development</a>
                <ul class="dropdown-menu p-2">
                  <li><a class="dropdown-item rounded-3" href="#">HTML & CSS</a></li>
                  <li><a class="dropdown-item rounded-3" href="#">JavaScript</a></li>
                  <li><a class="dropdown-item rounded-3" href="#">Accessibility</a></li>
                </ul>
              </li>
              <li><a class="dropdown-item rounded-3" href="#">Photography</a></li>
              <li><a class="dropdown-item rounded-3" href="#">Marketing</a></li>
            </ul>
          </li>
          <li class="nav-item"><a class="nav-link" href="#">About</a></li>
          <li class="nav-item"><a class="nav-link" href="#">Contact</a></li>
          <li class="nav-item ms-lg-2 mt-2 mt-lg-0"><a class="btn btn-primary rounded-pill px-3 d-inline-flex align-items-center edu-cta" href="#">Start learning</a></li>
        </ul>
      </div>
    </nav>
    <div class="edu-space d-none d-lg-flex" aria-hidden="true"><p class="small wdw-muted mb-0">Hover or focus a menu item. Arrow keys move between the menu and its submenu.</p></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 */
.edu-nav{--bs-navbar-padding-y:.6rem}
.edu-nav .navbar-brand{color:var(--bs-emphasis-color)}
.edu-nav .nav-link{font-weight:600;border-radius:.65rem;padding:.55rem .9rem!important;min-height:44px;display:flex;align-items:center}
.edu-nav .nav-link:hover{background:var(--bs-tertiary-bg);color:var(--bs-emphasis-color)}
.edu-nav .nav-link.active{color:var(--bs-primary);background:var(--bs-primary-bg-subtle)}
.edu-nav .dropdown-item{font-weight:500;padding:.55rem .85rem}
.edu-nav .dropend>.dropdown-toggle::after{margin-left:auto}
.edu-nav .dropend>.dropdown-toggle{display:flex;align-items:center}
@media (min-width:992px){
  .edu-nav .dropdown-menu{margin-top:.5rem;min-width:13rem}
  .edu-nav .dropend>.dropdown-menu{margin-top:-.5rem;margin-left:.25rem}
}
.edu-nav .edu-cta{min-height:44px;font-weight:600}
.edu-space{min-height:17rem;align-items:flex-end;justify-content:center;padding-top:1rem}
@media (max-width:991.98px){
  .edu-nav .dropdown-menu{position:static;float:none;border:0;box-shadow:none;background:transparent;padding:0 0 0 1rem!important;margin:0}
  .edu-nav .dropend>.dropdown-toggle::after{transform:rotate(90deg)}
}

(function initEduNav() {
  var nav = document.querySelector('.edu-nav');
  if (!nav || !window.matchMedia) return;
  var desktop = window.matchMedia('(min-width: 992px)');
  var hover = window.matchMedia('(min-width: 992px) and (hover: hover)');
  var items = nav.querySelectorAll('.dropdown, .dropend');

  function toggleOf(item) { return item.querySelector(':scope > [data-bs-toggle="dropdown"]'); }
  function inst(item) { return bootstrap.Dropdown.getOrCreateInstance(toggleOf(item)); }

  items.forEach(function (item) {
    var toggle = toggleOf(item);
    if (!toggle) return;
    var t;
    function open() { clearTimeout(t); inst(item).show(); }
    function close() { t = setTimeout(function () { inst(item).hide(); }, 120); }

    // Pointer: hover opens, click never closes what hover opened
    item.addEventListener('mouseenter', function () { if (hover.matches) open(); });
    item.addEventListener('mouseleave', function () { if (hover.matches) close(); });
    toggle.addEventListener('click', function (e) {
      if (!hover.matches) return;
      e.preventDefault();
      e.stopPropagation();
      open();
    });

    // Keyboard: focus reveals, leaving the item hides, arrows enter/leave submenus
    item.addEventListener('focusin', function () { if (hover.matches) open(); });
    item.addEventListener('focusout', function (e) {
      if (hover.matches && !item.contains(e.relatedTarget)) close();
    });
    if (item.classList.contains('dropend')) {
      toggle.addEventListener('keydown', function (e) {
        if (e.key !== 'ArrowRight') return;
        e.preventDefault();
        open();
        var first = item.querySelector(':scope > .dropdown-menu .dropdown-item');
        if (first) setTimeout(function () { first.focus(); }, 0);
      });
      item.addEventListener('keydown', function (e) {
        if (e.key !== 'ArrowLeft' || e.target === toggle) return;
        e.preventDefault();
        e.stopPropagation();
        inst(item).hide();
        toggle.focus();
      });
    }
  });

  // Open-state demo on desktop: Tutorials > Design
  if (desktop.matches) {
    var tut = nav.querySelector('.nav-item.dropdown');
    var design = tut && tut.querySelector('.dropend');
    if (tut && design) { inst(tut).show(); inst(design).show(); }
  }
})();