Bootstrap 5 Neumorphic Login and Signup Form

<section class="wdw-stage">
  <div class="container" style="max-width:560px">
    <div class="wdw-card neo-card p-4 p-sm-5">
      <div class="text-center mb-4">
        <span class="wdw-icon neo-badge mb-3" aria-hidden="true"><svg width="26" height="26" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.9" stroke-linecap="round" stroke-linejoin="round"><rect x="4" y="10" width="16" height="10" rx="3"/><path d="M8 10V7a4 4 0 018 0v3"/></svg></span>
        <h1 class="h2 wdw-heading mb-1" id="neoTitle">Welcome back</h1>
        <p class="wdw-muted mb-0" id="neoSub">Log in to pick up where you left off.</p>
      </div>
      <div class="neo-seg btn-group w-100 mb-4 rounded-pill" role="group" aria-label="Account">
        <input type="radio" class="btn-check" name="neoMode" id="neoLogin" value="login" autocomplete="off" checked>
        <label class="btn rounded-pill" for="neoLogin">Log in</label>
        <input type="radio" class="btn-check" name="neoMode" id="neoSignup" value="signup" autocomplete="off">
        <label class="btn rounded-pill" for="neoSignup">Sign up</label>
      </div>
      <form id="neoForm" novalidate>
        <div class="mb-3 neo-only-signup" hidden>
          <label for="neoName" class="form-label small fw-semibold">Full name</label>
          <input type="text" class="form-control neo-input" id="neoName" placeholder="Alex Morgan" autocomplete="name">
          <div class="invalid-feedback">Please enter your name.</div>
        </div>
        <div class="mb-3">
          <label for="neoEmail" class="form-label small fw-semibold">Email</label>
          <input type="email" class="form-control neo-input" id="neoEmail" placeholder="[email protected]" autocomplete="email" required>
          <div class="invalid-feedback">Enter a valid email address.</div>
        </div>
        <div class="mb-3">
          <label for="neoPass" class="form-label small fw-semibold">Password</label>
          <input type="password" class="form-control neo-input" id="neoPass" placeholder="At least 8 characters" autocomplete="current-password" minlength="8" required>
          <div class="invalid-feedback">Use at least 8 characters.</div>
        </div>
        <div class="d-flex justify-content-between align-items-center mb-4 small neo-only-login">
          <div class="form-check mb-0"><input class="form-check-input" type="checkbox" id="neoRemember"><label class="form-check-label" for="neoRemember">Remember me</label></div>
          <a href="#" class="fw-semibold text-decoration-none">Forgot password?</a>
        </div>
        <button type="submit" class="btn btn-primary rounded-pill w-100 mt-2" id="neoSubmit">Log in</button>
        <div class="alert alert-success mt-3 mb-0 py-2 small" role="status" id="neoOk" hidden></div>
      </form>
    </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 */
.neo-card { --neo-edge: color-mix(in srgb, var(--bs-body-color) 48%, var(--bs-body-bg)); }
.neo-badge { width: 64px; height: 64px; border-radius: 50%; }
.neo-seg { padding: .3rem; gap: .25rem; background: var(--bs-tertiary-bg); border: 1px solid var(--neo-edge); }
.neo-seg .btn { flex: 1 1 0; border: 0; color: var(--bs-secondary-color); --bs-btn-hover-color: var(--bs-emphasis-color); --bs-btn-active-color: var(--bs-emphasis-color); }
.neo-seg .btn-check:checked + .btn { background: var(--bs-body-bg); color: var(--bs-primary-text-emphasis); box-shadow: var(--wdw-shadow-sm), inset 0 0 0 1px var(--bs-primary); }
.neo-seg .btn-check:focus-visible + .btn { outline: 3px solid var(--bs-focus-ring-color); outline-offset: 1px; }
.neo-input { background: var(--bs-tertiary-bg); border: 1px solid var(--neo-edge); padding-inline: 1.1rem; box-shadow: inset 0 2px 4px rgba(var(--bs-emphasis-color-rgb), .08); }
.neo-input:focus { background: var(--bs-body-bg); border-color: var(--bs-primary); box-shadow: 0 0 0 .25rem var(--bs-focus-ring-color); }
.neo-card .form-check-input { width: 1.25rem; height: 1.25rem; margin-top: .1rem; border: 2px solid var(--neo-edge); background-color: var(--bs-body-bg); }
.neo-card .form-check-input:checked { background-color: var(--bs-primary); border-color: var(--bs-primary); }
[data-bs-theme="dark"] .neo-card .form-check-input:checked { --bs-form-check-bg-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20'%3e%3cpath fill='none' stroke='%230f1117' stroke-linecap='round' stroke-linejoin='round' stroke-width='3' d='m6 10 3 3 6-6'/%3e%3c/svg%3e"); }
[hidden] { display: none !important; }
.neo-card .form-check-label { margin-left: .4rem; }

function initNeoAuth() {
  const form = document.getElementById('neoForm');
  if (!form) return;
  const radios = document.querySelectorAll('input[name="neoMode"]');
  const title = document.getElementById('neoTitle');
  const sub = document.getElementById('neoSub');
  const submit = document.getElementById('neoSubmit');
  const pass = document.getElementById('neoPass');
  const name = document.getElementById('neoName');
  const ok = document.getElementById('neoOk');
  const copy = {
    login: ['Welcome back', 'Log in to pick up where you left off.', 'Log in', 'current-password', 'Logged in. Welcome back!'],
    signup: ['Create account', 'Start free, no card required.', 'Create account', 'new-password', 'Account created. Check your inbox.']
  };
  let mode = 'login';
  const setMode = (m) => {
    mode = m;
    const c = copy[m];
    title.textContent = c[0]; sub.textContent = c[1]; submit.textContent = c[2];
    pass.setAttribute('autocomplete', c[3]);
    name.required = m === 'signup';
    form.querySelectorAll('.neo-only-signup').forEach((el) => { el.hidden = m !== 'signup'; });
    form.querySelectorAll('.neo-only-login').forEach((el) => { el.hidden = m !== 'login'; });
    form.classList.remove('was-validated');
    ok.hidden = true;
  };
  radios.forEach((r) => r.addEventListener('change', () => { if (r.checked) setMode(r.value); }));
  form.addEventListener('submit', (e) => {
    e.preventDefault();
    form.classList.add('was-validated');
    ok.hidden = true;
    if (!form.checkValidity()) return;
    ok.textContent = copy[mode][4];
    ok.hidden = false;
  });
  setMode('login');
}
initNeoAuth();