Bootstrap 5 Login and Sign Up Split Form

<section class="wdw-stage">
  <div class="container" style="max-width:980px">
    <div class="wdw-card overflow-hidden position-relative">
      <div class="row g-0">
        <div class="col-md-6 p-4 p-lg-5">
          <span class="wdw-icon mb-4">
            <svg width="22" height="22" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.85" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><rect x="4" y="10" width="16" height="10" rx="2.5"/><path d="M8 10V7a4 4 0 0 1 8 0v3"/></svg>
          </span>
          <h2 class="wdw-heading h3 mb-1">Welcome back</h2>
          <p class="wdw-muted mb-4">Sign in to pick up where you left off.</p>
          <form class="wdw-dual-form" novalidate>
            <div class="form-floating mb-3">
              <input type="email" class="form-control" id="loginEmail" placeholder="[email protected]" autocomplete="email" required>
              <label for="loginEmail">Email address</label>
            </div>
            <div class="form-floating mb-3">
              <input type="password" class="form-control" id="loginPassword" placeholder="Password" autocomplete="current-password" required>
              <label for="loginPassword">Password</label>
            </div>
            <div class="d-flex justify-content-between align-items-center mb-4">
              <div class="form-check mb-0">
                <input class="form-check-input" type="checkbox" id="loginRemember">
                <label class="form-check-label small" for="loginRemember">Remember me</label>
              </div>
              <a href="#" class="small fw-semibold link-underline-opacity-0">Forgot password?</a>
            </div>
            <button type="submit" class="btn btn-primary rounded-pill w-100">Sign in</button>
            <p class="small text-center text-success mt-3 mb-0 wdw-form-msg" role="status" hidden></p>
          </form>
        </div>

        <div class="col-md-6 wdw-aurora p-4 p-lg-5 wdw-dual-right">
          <span class="wdw-icon mb-4 wdw-icon-glass">
            <svg width="22" height="22" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.85" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><circle cx="9" cy="8" r="4"/><path d="M2 21a7 7 0 0 1 14 0M19 8v6M16 11h6"/></svg>
          </span>
          <h2 class="h3 fw-bold mb-1 text-white">Create an account</h2>
          <p class="text-white-50 mb-4">Free for 14 days. No credit card required.</p>
          <form class="wdw-dual-form" novalidate>
            <div class="form-floating mb-3">
              <input type="text" class="form-control" id="signName" placeholder="Full name" autocomplete="name" required>
              <label for="signName">Full name</label>
            </div>
            <div class="form-floating mb-3">
              <input type="email" class="form-control" id="signEmail" placeholder="[email protected]" autocomplete="email" required>
              <label for="signEmail">Email address</label>
            </div>
            <div class="form-floating mb-4">
              <input type="password" class="form-control" id="signPassword" placeholder="Password" autocomplete="new-password" minlength="8" required>
              <label for="signPassword">Password (8+ characters)</label>
            </div>
            <button type="submit" class="btn btn-light rounded-pill w-100">Create account</button>
            <p class="small text-center text-white mt-3 mb-0 wdw-form-msg" role="status" hidden></p>
          </form>
        </div>
      </div>
      <span class="wdw-or d-none d-md-flex" aria-hidden="true">or</span>
    </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 */
.wdw-or { position: absolute; top: 50%; left: 50%; width: 2.75rem; height: 2.75rem; transform: translate(-50%, -50%); align-items: center; justify-content: center; border-radius: 50%; background: var(--bs-body-bg); color: var(--bs-secondary-color); font-size: .75rem; font-weight: 700; text-transform: uppercase; box-shadow: 0 0 0 6px rgba(255,255,255,.12), var(--wdw-shadow-sm); }
.wdw-icon-glass { background: rgba(255,255,255,.16); color: #fff; }
.wdw-dual-right .form-control { background: rgba(255,255,255,.95); border-color: transparent; color: #111827; }
.wdw-dual-right .form-floating > label { color: #4b5563; }
.wdw-dual-right .form-check-input { border-color: rgba(255,255,255,.7); }
.wdw-dual-right .btn-light { --bs-btn-color: #1e1b4b; }
.wdw-dual-form .form-control.is-invalid { border-color: var(--bs-danger); }
.wdw-dual-right .form-control.is-invalid { border-color: #fecaca; box-shadow: 0 0 0 .2rem rgba(248,113,113,.5); }
.wdw-dual-form .form-check-label { cursor: pointer; }
@media (max-width: 767.98px) { .wdw-stage { padding-block: 1.5rem; } }

function initDualForms() {
  document.querySelectorAll('.wdw-dual-form').forEach(function (form) {
    var msg = form.querySelector('.wdw-form-msg');
    form.addEventListener('submit', function (e) {
      e.preventDefault();
      var valid = true;
      form.querySelectorAll('input[required]').forEach(function (input) {
        var ok = input.checkValidity();
        input.classList.toggle('is-invalid', !ok);
        if (!ok) valid = false;
      });
      if (!msg) return;
      msg.hidden = !valid;
      msg.textContent = valid ? 'Looks good. This demo does not send anything.' : '';
    });
    form.addEventListener('input', function (e) { e.target.classList.remove('is-invalid'); });
  });
}
initDualForms();