Bootstrap 5 Registration Form with Password Strength

<section class="wdw-stage">
  <div class="container" style="max-width:1020px">
    <div class="wdw-card overflow-hidden">
      <div class="row g-0">
        <div class="col-lg-5 wdw-aurora p-4 p-md-5 d-flex flex-column justify-content-between rg-side">
          <div class="fw-bold fs-5">Northwind</div>
          <div class="py-4">
            <h2 class="fw-bold display-6 mb-3" style="letter-spacing:-.02em">Create your free account</h2>
            <ul class="list-unstyled mb-0 d-grid gap-3">
              <li class="d-flex gap-2"><svg width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true" class="flex-none mt-1"><path d="M20 6 9 17l-5-5"/></svg><span>Unlimited projects, no card required</span></li>
              <li class="d-flex gap-2"><svg width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true" class="flex-none mt-1"><path d="M20 6 9 17l-5-5"/></svg><span>Invite your whole team</span></li>
              <li class="d-flex gap-2"><svg width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true" class="flex-none mt-1"><path d="M20 6 9 17l-5-5"/></svg><span>Cancel or export your data anytime</span></li>
            </ul>
          </div>
          <p class="small opacity-75 mb-0">Already registered? <a href="#" class="text-white fw-semibold">Log in</a></p>
        </div>
        <div class="col-lg-7">
          <form class="p-4 p-md-5" id="rg-form" novalidate>
            <h3 class="wdw-heading h4 mb-4">Your details</h3>
            <div class="row g-3">
              <div class="col-sm-6"><div class="form-floating"><input class="form-control" id="rg-fn" placeholder="First name" autocomplete="given-name" required><label for="rg-fn">First name</label></div></div>
              <div class="col-sm-6"><div class="form-floating"><input class="form-control" id="rg-ln" placeholder="Last name" autocomplete="family-name"><label for="rg-ln">Last name</label></div></div>
              <div class="col-12"><div class="form-floating"><input type="email" class="form-control" id="rg-em" placeholder="Email" autocomplete="email" required><label for="rg-em">Email</label><div class="invalid-feedback">Enter a valid email address.</div></div></div>
              <div class="col-sm-6"><div class="form-floating"><input type="password" class="form-control" id="rg-pw" placeholder="Password" autocomplete="new-password" minlength="8" required><label for="rg-pw">Password</label><div class="invalid-feedback">At least 8 characters.</div></div></div>
              <div class="col-sm-6"><div class="form-floating"><input type="password" class="form-control" id="rg-pw2" placeholder="Confirm password" autocomplete="new-password" required><label for="rg-pw2">Confirm password</label><div class="invalid-feedback">Passwords do not match.</div></div></div>
              <div class="col-12"><div class="progress" style="height:6px" aria-hidden="true"><div class="progress-bar" id="rg-meter" style="width:0"></div></div><div class="small wdw-muted mt-1" id="rg-hint">Password strength</div></div>
              <div class="col-sm-6"><div class="form-floating"><input type="date" class="form-control" id="rg-dob" placeholder="Date of birth" autocomplete="bday" required><label for="rg-dob">Date of birth</label></div></div>
              <div class="col-sm-6"><div class="form-floating"><input type="tel" class="form-control" id="rg-ph" placeholder="Phone number" autocomplete="tel"><label for="rg-ph">Phone number</label></div></div>
              <div class="col-12">
                <div class="form-check">
                  <input class="form-check-input" type="checkbox" id="rg-terms" required>
                  <label class="form-check-label" for="rg-terms">I agree to the <a href="#" class="fw-semibold link-underline-opacity-0">Terms</a> and <a href="#" class="fw-semibold link-underline-opacity-0">Privacy Policy</a></label>
                </div>
              </div>
              <div class="col-12"><button type="submit" class="btn btn-primary rounded-pill w-100">Create account</button><div class="alert alert-success d-none mt-3 mb-0 py-2" id="rg-ok" role="status">Account created. Check your inbox to confirm.</div></div>
            </div>
          </form>
        </div>
      </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 */
.rg-side{min-height:260px}
.flex-none{flex:none}

function initRegistration() {
  var form = document.getElementById('rg-form');
  if (!form) return;
  var pw = document.getElementById('rg-pw');
  var pw2 = document.getElementById('rg-pw2');
  var meter = document.getElementById('rg-meter');
  var hint = document.getElementById('rg-hint');
  var levels = [['Too short', 'bg-danger', 20], ['Weak', 'bg-danger', 40], ['Fair', 'bg-warning', 65], ['Good', 'bg-success', 85], ['Strong', 'bg-success', 100]];
  function score(v) {
    var s = 0;
    if (v.length >= 8) s++;
    if (/[a-z]/.test(v) && /[A-Z]/.test(v)) s++;
    if (/\d/.test(v)) s++;
    if (/[^A-Za-z0-9]/.test(v)) s++;
    return v ? s : -1;
  }
  function match() { pw2.setCustomValidity(pw2.value && pw2.value !== pw.value ? 'mismatch' : ''); }
  pw.addEventListener('input', function () {
    var s = score(pw.value);
    meter.className = 'progress-bar';
    if (s < 0) { meter.style.width = '0'; hint.textContent = 'Password strength'; }
    else { var l = levels[s]; meter.classList.add(l[1]); meter.style.width = l[2] + '%'; hint.textContent = 'Strength: ' + l[0]; }
    match();
  });
  pw2.addEventListener('input', match);
  form.addEventListener('submit', function (e) {
    e.preventDefault();
    match();
    var ok = form.checkValidity();
    form.classList.add('was-validated');
    document.getElementById('rg-ok').classList.toggle('d-none', !ok);
  });
}
initRegistration();