Pure CSS and SVG Leaf Navbar for Bootstrap 5

<section class="wdw-stage">
  <div class="container" style="max-width: 1040px">
    <div class="text-center mb-4">
      <span class="wdw-eyebrow">Navigation</span>
      <h2 class="wdw-heading h3 mb-1">Leaf navbar</h2>
      <p class="wdw-muted mb-0">A menu laid along the midrib of a leaf, drawn with a single SVG.</p>
    </div>
    <nav class="lf-nav" aria-label="Leaf menu">
      <svg class="lf-svg" viewBox="0 0 640 280" aria-hidden="true" focusable="false">
        <path class="lf-stem" d="M14 150 C40 130 70 150 140 140"/>
        <circle class="lf-bud" cx="14" cy="150" r="9"/>
        <path class="lf-blade" d="M140 140 C210 20 430 6 626 140 C430 274 210 260 140 140 Z"/>
        <path class="lf-shine" d="M140 140 C210 20 430 6 626 140 Z"/>
        <g class="lf-veins">
          <path d="M140 140 H612"/>
          <path d="M215 140 L262 70M215 140 L262 210"/>
          <path d="M310 140 L360 62M310 140 L360 218"/>
          <path d="M405 140 L455 72M405 140 L455 208"/>
          <path d="M498 140 L535 90M498 140 L535 190"/>
        </g>
      </svg>
      <ul class="lf-links list-unstyled mb-0">
        <li style="left: 36.2%"><a href="#" class="lf-link is-active" aria-current="page">Home</a></li>
        <li style="left: 50.6%"><a href="#" class="lf-link">Menu</a></li>
        <li style="left: 65.4%"><a href="#" class="lf-link">About</a></li>
        <li style="left: 80.4%"><a href="#" class="lf-link">Contact</a></li>
      </ul>
    </nav>
  </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 */
.lf-nav { --lf-blade: var(--bs-primary); --lf-pill: var(--bs-primary-text-emphasis); position: relative; width: 100%; aspect-ratio: 640 / 280; filter: drop-shadow(0 18px 24px rgba(79, 70, 229, .22)); }
[data-bs-theme="dark"] .lf-nav { --lf-blade: #4f46e5; --lf-pill: #3730a3; }
.lf-svg { position: absolute; inset: 0; width: 100%; height: 100%; overflow: visible; }
.lf-blade, .lf-bud { fill: var(--lf-blade); }
.lf-shine { fill: #fff; opacity: .14; }
.lf-stem { fill: none; stroke: var(--lf-blade); stroke-width: 9; stroke-linecap: round; }
.lf-veins path { fill: none; stroke: rgba(255,255,255,.4); stroke-width: 3; stroke-linecap: round; }
.lf-links { position: absolute; inset: 0; }
.lf-links li { position: absolute; top: 50%; transform: translate(-50%, -50%); }
.lf-link { display: inline-flex; align-items: center; justify-content: center; min-width: 44px; min-height: 44px; padding: 0 1rem; border-radius: 999px; background: var(--lf-pill); color: #fff; font-weight: 700; font-size: clamp(.8rem, 2.4vw, 1rem); text-decoration: none; white-space: nowrap; box-shadow: 0 0 0 4px rgba(255,255,255,.18); transition: background-color .2s, color .2s, transform .2s; }
.lf-link:hover { background: rgba(255,255,255,.22); color: #fff; transform: translateY(-2px); }
.lf-link.is-active, .lf-link.is-active:hover { background: #fff; color: var(--lf-pill); }
.lf-link:focus-visible { outline: 3px solid #fff; outline-offset: 2px; }
@media (max-width: 575.98px) {
  /* Portrait leaf: rotate the drawing 90deg so the midrib runs top to bottom and the pills have room. */
  .lf-nav { aspect-ratio: 280 / 640; overflow: hidden; }
  .lf-svg { inset: auto; top: 50%; left: 50%; width: 228.571%; height: 100%; transform: translate(-50%, -50%) rotate(90deg); }
  .lf-links li { left: 50% !important; }
  .lf-links li:nth-child(1) { top: 36.2%; }
  .lf-links li:nth-child(2) { top: 50.6%; }
  .lf-links li:nth-child(3) { top: 65.4%; }
  .lf-links li:nth-child(4) { top: 80.4%; }
  .lf-link { min-width: 7rem; font-size: 1rem; }
}
@media (prefers-reduced-motion: reduce) { .lf-link { transition: none; } }

function initLeafNav() {
  var links = document.querySelectorAll('.lf-link');
  if (!links.length) return;
  // Spread the links along the midrib (36% to 80% of the leaf) so adding or removing one keeps them evenly spaced.
  var items = document.querySelectorAll('.lf-links li');
  items.forEach(function (li, i) {
    li.style.left = (36.2 + i * (44.2 / Math.max(items.length - 1, 1))) + '%';
    li.style.top = '';
  });
  links.forEach(function (link) {
    link.addEventListener('click', function (e) {
      e.preventDefault();
      links.forEach(function (l) { l.classList.remove('is-active'); l.removeAttribute('aria-current'); });
      link.classList.add('is-active');
      link.setAttribute('aria-current', 'page');
    });
  });
}
initLeafNav();