Bootstrap 5 Footer with Animated Wave and Newsletter

<section class="wdw-stage align-items-end p-0">
  <div class="container-fluid px-0 d-flex flex-column justify-content-end" style="min-height:100vh">
    <div class="d-flex align-items-center justify-content-center text-center px-3 py-5 wdw-pagehint">
      <div>
        <span class="wdw-eyebrow">Page content</span>
        <h1 class="wdw-heading display-6 mt-1">A page that ends with a footer worth scrolling to.</h1>
        <p class="wdw-muted mb-0">A footer with a soft animated wave and clear link columns.</p>
      </div>
    </div>
    <footer class="wdw-footer wdw-aurora position-relative overflow-hidden">
      <svg class="wdw-wave wdw-wave-back" viewBox="0 0 2880 100" preserveAspectRatio="none" aria-hidden="true"><path d="M0 50 C360 100 360 0 720 50 S1080 100 1440 50 C1800 100 1800 0 2160 50 S2520 100 2880 50 V0 H0Z"/></svg>
      <svg class="wdw-wave wdw-wave-front" viewBox="0 0 2880 100" preserveAspectRatio="none" aria-hidden="true"><path d="M0 50 C360 100 360 0 720 50 S1080 100 1440 50 C1800 100 1800 0 2160 50 S2520 100 2880 50 V0 H0Z"/></svg>
      <div class="container position-relative wdw-footer-body" style="max-width:1100px">
        <div class="row g-4 g-lg-5">
          <div class="col-lg-4">
            <div class="fw-bold fs-3 mb-2">Northwind</div>
            <p class="opacity-75 mb-4">Tools that help small teams ship thoughtful work, faster.</p>
            <form class="d-flex gap-2" id="ftForm" novalidate>
              <label class="visually-hidden" for="ftEmail">Email</label>
              <input id="ftEmail" type="email" class="form-control rounded-pill wdw-ft-input" placeholder="Email address" required>
              <button class="btn btn-primary rounded-pill px-4" type="submit">Join</button>
            </form>
            <div class="small mt-2 opacity-75" id="ftMsg" role="status"></div>
          </div>
          <div class="col-6 col-md-4 col-lg-2 offset-lg-1"><h2 class="h6 fw-bold mb-3">Product</h2><ul class="list-unstyled mb-0 d-grid gap-2"><li><a href="#">Features</a></li><li><a href="#">Pricing</a></li><li><a href="#">Changelog</a></li><li><a href="#">Roadmap</a></li></ul></div>
          <div class="col-6 col-md-4 col-lg-2"><h2 class="h6 fw-bold mb-3">Company</h2><ul class="list-unstyled mb-0 d-grid gap-2"><li><a href="#">About</a></li><li><a href="#">Careers</a></li><li><a href="#">Blog</a></li><li><a href="#">Contact</a></li></ul></div>
          <div class="col-12 col-md-4 col-lg-2"><h2 class="h6 fw-bold mb-3">Legal</h2><ul class="list-unstyled mb-0 d-grid gap-2"><li><a href="#">Privacy</a></li><li><a href="#">Terms</a></li><li><a href="#">Security</a></li></ul></div>
        </div>
        <hr class="border-light opacity-25 my-4 my-lg-5">
        <div class="d-flex flex-column flex-sm-row justify-content-between gap-2 small opacity-75"><span>© 2026 Northwind Inc.</span><span>Made with care.</span></div>
      </div>
    </footer>
  </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 */
.wdw-pagehint { min-height: 14vh; }
.wdw-footer { background: radial-gradient(45% 50% at 100% 100%, rgba(129,140,248,.85) 0, transparent 70%), radial-gradient(50% 50% at 0 100%, rgba(236,72,153,.85) 0, transparent 65%), #1e1b4b; }
.wdw-footer-body { padding-top: 8.5rem; padding-bottom: 2.5rem; }
.wdw-footer a { color: rgba(255,255,255,.78); text-decoration: none; display: inline-block; padding-block: .15rem; }
.wdw-footer a:hover, .wdw-footer a:focus-visible { color: #fff; text-decoration: underline; }
.wdw-footer .wdw-ft-input { min-width: 0; color: #fff; background: rgba(255,255,255,.12); border: 1px solid rgba(255,255,255,.3); }
.wdw-footer .wdw-ft-input::placeholder { color: rgba(255,255,255,.7); opacity: 1; }
.wdw-footer .wdw-ft-input:focus { background: rgba(255,255,255,.18); color: #fff; border-color: #fff; }
[data-bs-theme="dark"] .wdw-footer .btn-primary { --bs-btn-color: #fff; --bs-btn-bg: #6366f1; --bs-btn-border-color: #6366f1; --bs-btn-hover-color: #fff; }
.wdw-wave { position: absolute; top: -1px; left: 0; width: 200%; height: 100px; fill: var(--wdw-stage); }
.wdw-wave-back { opacity: .4; transform: translateX(-25%) scaleY(-1) translateY(-14px); animation: wdw-wave-b 22s linear infinite; }
.wdw-wave-front { animation: wdw-wave 14s linear infinite; }
@keyframes wdw-wave { from { transform: translateX(0); } to { transform: translateX(-50%); } }
@keyframes wdw-wave-b { from { transform: translateX(-50%) translateY(10px); } to { transform: translateX(0) translateY(10px); } }
@media (prefers-reduced-motion: reduce) { .wdw-wave { animation: none; } }

(function () {
  function initFooterForm() {
    var form = document.getElementById('ftForm');
    if (!form) return;
    var email = document.getElementById('ftEmail');
    var msg = document.getElementById('ftMsg');
    form.addEventListener('submit', function (e) {
      e.preventDefault();
      if (!email.checkValidity()) { msg.textContent = 'Please enter a valid email.'; return; }
      msg.textContent = 'Thanks, you are on the list.';
      form.reset();
    });
  }
  initFooterForm();
})();