Bootstrap 5 Login and Registration Form with Switch

<section class="wdw-stage">
  <div class="container" style="max-width:940px">
    <div class="wdw-card overflow-hidden">
      <div class="row g-0">
        <aside class="col-lg-5 wdw-aurora ac-side d-none d-lg-flex flex-column justify-content-between p-5">
          <span class="wdw-icon ac-side-icon"><svg width="22" height="22" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.75" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><rect x="4" y="11" width="16" height="10" rx="2"/><path d="M8 11V7a4 4 0 0 1 8 0v4"/></svg></span>
          <div>
            <h2 class="h3 fw-bold mb-3">Everything in one place.</h2>
            <ul class="list-unstyled small mb-0 d-grid gap-2 ac-perks">
              <li class="d-flex gap-2"><svg width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="M5 12l5 5L20 7"/></svg>Free 14-day trial, no card</li>
              <li class="d-flex gap-2"><svg width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="M5 12l5 5L20 7"/></svg>Sync across all your devices</li>
              <li class="d-flex gap-2"><svg width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="M5 12l5 5L20 7"/></svg>Cancel any time</li>
            </ul>
          </div>
        </aside>
        <div class="col-lg-7 p-4 p-md-5">
          <div id="ac-head" aria-live="polite" class="mb-4">
            <h2 class="wdw-heading h3 mb-1" id="ac-title">Welcome back</h2>
            <p class="wdw-muted mb-0" id="ac-sub">Log in to continue to your dashboard.</p>
          </div>
          <div class="ac-switch d-flex rounded-pill p-1 mb-4" role="group" aria-label="Login or register">
            <button type="button" class="btn rounded-pill flex-fill active" data-ac-mode="login" aria-pressed="true">Log in</button>
            <button type="button" class="btn rounded-pill flex-fill" data-ac-mode="register" aria-pressed="false">Register</button>
          </div>
          <form id="ac-form" novalidate>
            <div id="ac-panel">
              <div class="form-floating mb-3 ac-reg d-none">
                <input class="form-control" id="ac-name" placeholder="Full name" autocomplete="name" disabled required>
                <label for="ac-name">Full name</label>
                <div class="invalid-feedback">Enter your name.</div>
              </div>
              <div class="form-floating mb-3">
                <input type="email" class="form-control" id="ac-email" placeholder="Email" autocomplete="email" required>
                <label for="ac-email">Email address</label>
                <div class="invalid-feedback">Enter a valid email address.</div>
              </div>
              <div class="form-floating mb-3">
                <input type="password" class="form-control" id="ac-pass" placeholder="Password" autocomplete="current-password" minlength="6" required>
                <label for="ac-pass">Password</label>
                <div class="invalid-feedback">Use at least 6 characters.</div>
              </div>
              <div class="d-flex justify-content-between align-items-center mb-4 ac-log">
                <div class="form-check mb-0"><input class="form-check-input" type="checkbox" id="ac-rem"><label class="form-check-label" for="ac-rem">Remember me</label></div>
                <a href="#" class="small fw-semibold link-underline-opacity-0">Forgot password?</a>
              </div>
              <div class="form-check mb-4 ac-reg d-none">
                <input class="form-check-input" type="checkbox" id="ac-terms" disabled required>
                <label class="form-check-label" for="ac-terms">I accept the terms of service</label>
              </div>
            </div>
            <button type="submit" class="btn btn-primary rounded-pill w-100" id="ac-submit">Log in</button>
            <div class="alert alert-success d-none mt-3 mb-0 py-2" id="ac-ok" role="status"></div>
          </form>
          <div class="d-flex align-items-center gap-3 my-4 wdw-muted small"><hr class="flex-grow-1 m-0"><span>or continue with</span><hr class="flex-grow-1 m-0"></div>
          <div class="row g-2">
            <div class="col-6"><button type="button" class="btn btn-outline-secondary rounded-pill w-100">
              <svg width="18" height="18" viewBox="0 0 24 24" aria-hidden="true"><path fill="#4285F4" d="M22.56 12.25c0-.78-.07-1.53-.2-2.25H12v4.26h5.92a5.06 5.06 0 0 1-2.2 3.32v2.77h3.57c2.08-1.92 3.27-4.74 3.27-8.1z"/><path fill="#34A853" d="M12 23c2.97 0 5.46-.98 7.28-2.66l-3.57-2.77c-.98.66-2.23 1.06-3.71 1.06-2.86 0-5.29-1.93-6.16-4.53H2.18v2.84A11 11 0 0 0 12 23z"/><path fill="#FBBC05" d="M5.84 14.1a6.6 6.6 0 0 1 0-4.2V7.06H2.18a11 11 0 0 0 0 9.88l3.66-2.84z"/><path fill="#EA4335" d="M12 5.38c1.62 0 3.06.56 4.21 1.64l3.15-3.15C17.45 2.09 14.97 1 12 1A11 11 0 0 0 2.18 7.06l3.66 2.84C6.71 7.31 9.14 5.38 12 5.38z"/></svg>Google</button></div>
            <div class="col-6"><button type="button" class="btn btn-outline-secondary rounded-pill w-100">
              <svg width="18" height="18" viewBox="0 0 24 24" fill="currentColor" aria-hidden="true"><path d="M12 .5A11.5 11.5 0 0 0 .5 12c0 5.08 3.29 9.39 7.86 10.91.58.1.79-.25.79-.56v-2c-3.2.7-3.87-1.37-3.87-1.37-.52-1.33-1.28-1.69-1.28-1.69-1.04-.71.08-.7.08-.7 1.15.08 1.76 1.18 1.76 1.18 1.03 1.76 2.69 1.25 3.35.96.1-.74.4-1.25.73-1.54-2.55-.29-5.24-1.28-5.24-5.68 0-1.26.45-2.28 1.18-3.09-.12-.29-.51-1.46.11-3.05 0 0 .97-.31 3.17 1.18a11 11 0 0 1 5.77 0c2.2-1.49 3.17-1.18 3.17-1.18.63 1.59.23 2.76.11 3.05.74.81 1.18 1.83 1.18 3.09 0 4.41-2.69 5.38-5.25 5.67.41.36.78 1.06.78 2.14v3.17c0 .31.21.67.8.56A11.5 11.5 0 0 0 23.5 12 11.5 11.5 0 0 0 12 .5z"/></svg>GitHub</button></div>
          </div>
        </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 */
.ac-side{min-height:100%}
.ac-side-icon{background:rgba(255,255,255,.16);color:#fff}
.ac-perks svg{flex:none;margin-top:1px}
.ac-switch{background:var(--bs-secondary-bg);border:1px solid var(--bs-border-color)}
.ac-switch .btn{--bs-btn-border-color:transparent;--bs-btn-color:var(--bs-secondary-color);--bs-btn-hover-color:var(--bs-emphasis-color);--bs-btn-hover-border-color:transparent;--bs-btn-active-border-color:transparent;min-height:40px}
.ac-switch .btn.active{background:var(--bs-primary);color:#fff;box-shadow:var(--wdw-shadow-sm)}
[data-bs-theme="dark"] .ac-switch .btn.active{color:#0f1117}
.wdw-stage .btn-outline-secondary{--bs-btn-color:var(--bs-body-color);--bs-btn-border-color:var(--bs-border-color);--bs-btn-hover-bg:var(--bs-tertiary-bg);--bs-btn-hover-color:var(--bs-emphasis-color);--bs-btn-hover-border-color:var(--bs-border-color);--bs-btn-active-bg:var(--bs-tertiary-bg);--bs-btn-active-color:var(--bs-emphasis-color)}

function initAuthSwitch() {
  var form = document.getElementById('ac-form');
  if (!form) return;
  var tabs = document.querySelectorAll('[data-ac-mode]');
  var copy = {
    login: ['Welcome back', 'Log in to continue to your dashboard.', 'Log in', 'Signed in. Redirecting...'],
    register: ['Create your account', 'Start your free 14-day trial today.', 'Create account', 'Account created. Check your inbox.']
  };
  var mode = 'login';
  function setMode(m) {
    mode = m;
    form.classList.remove('was-validated');
    document.getElementById('ac-ok').classList.add('d-none');
    tabs.forEach(function (t) {
      var on = t.dataset.acMode === m;
      t.classList.toggle('active', on);
      t.setAttribute('aria-pressed', String(on));
    });
    var reg = m === 'register';
    form.querySelectorAll('.ac-reg').forEach(function (el) {
      el.classList.toggle('d-none', !reg);
      el.querySelectorAll('input').forEach(function (i) { i.disabled = !reg; });
    });
    form.querySelectorAll('.ac-log').forEach(function (el) { el.classList.toggle('d-none', reg); });
    document.getElementById('ac-pass').autocomplete = reg ? 'new-password' : 'current-password';
    document.getElementById('ac-title').textContent = copy[m][0];
    document.getElementById('ac-sub').textContent = copy[m][1];
    document.getElementById('ac-submit').textContent = copy[m][2];
  }
  tabs.forEach(function (t) { t.addEventListener('click', function () { setMode(t.dataset.acMode); }); });
  form.addEventListener('submit', function (e) {
    e.preventDefault();
    var ok = form.checkValidity();
    form.classList.add('was-validated');
    var msg = document.getElementById('ac-ok');
    msg.textContent = copy[mode][3];
    msg.classList.toggle('d-none', !ok);
  });
}
initAuthSwitch();