<form class="lf-bio" aria-label="Biometric or password sign in">
  <button type="button" class="lf-bio-print" aria-label="Sign in with passkey">
    <svg viewBox="0 0 64 64" width="40" height="40" aria-hidden="true">
      <g fill="none" stroke="currentColor" stroke-width="2.4" stroke-linecap="round">
        <path d="M16 38c0-10 7-18 16-18s16 8 16 18" />
        <path d="M22 42c0-7 4.5-12 10-12s10 5 10 12" />
        <path d="M28 46c0-4 1.5-7 4-7s4 3 4 7" />
        <path d="M14 28c4-6 10-10 18-10s14 4 18 10" />
      </g>
    </svg>
    <span class="lf-bio-scan" aria-hidden="true"></span>
  </button>
  <h2 class="lf-bio-title">Use your passkey</h2>
  <p class="lf-bio-sub">Touch the sensor or use Face ID</p>
  <hr class="lf-bio-divider" />
  <details class="lf-bio-fallback">
    <summary>or sign in with password</summary>
    <label class="lf-bio-row">
      <input type="email" name="email" autocomplete="email" placeholder="Email" required />
    </label>
    <label class="lf-bio-row">
      <input
        type="password"
        name="password"
        autocomplete="current-password"
        placeholder="Password"
        required
      />
    </label>
    <button type="submit" class="lf-bio-submit">Sign in</button>
  </details>
</form>

.lf-bio {
  width: 100%;
  max-width: 280px;
  background: #15151d;
  border: 1px solid rgba(255, 255, 255, 0.07);
  border-radius: 16px;
  padding: 28px 22px 22px;
  display: grid;
  gap: 8px;
  justify-items: center;
  text-align: center;
}
.lf-bio-print {
  position: relative;
  width: 86px;
  height: 86px;
  border-radius: 50%;
  background: radial-gradient(circle at 30% 30%, #2a2a36 0%, #0a0a14 70%);
  border: 1px solid rgba(124, 108, 255, 0.4);
  color: #c8c0ff;
  display: grid;
  place-items: center;
  cursor: pointer;
  overflow: hidden;
  box-shadow:
    0 0 0 4px rgba(124, 108, 255, 0.05),
    0 8px 24px -8px rgba(124, 108, 255, 0.45);
  transition:
    transform 0.15s,
    box-shadow 0.25s;
}
.lf-bio-print:hover {
  transform: translateY(-1px);
  box-shadow:
    0 0 0 6px rgba(124, 108, 255, 0.1),
    0 12px 32px -8px rgba(124, 108, 255, 0.6);
}
.lf-bio-scan {
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 12px;
  background: linear-gradient(180deg, transparent, rgba(124, 108, 255, 0.65), transparent);
  animation: lfBioScan 2.4s ease-in-out infinite;
}
@keyframes lfBioScan {
  0%,
  100% {
    transform: translateY(0);
    opacity: 0.9;
  }
  50% {
    transform: translateY(74px);
    opacity: 1;
  }
}
.lf-bio-title {
  margin: 8px 0 0;
  font-size: 14px;
  font-weight: 700;
  color: #f0eeff;
}
.lf-bio-sub {
  margin: 0;
  font-size: 12px;
  color: #b8b6d4;
}
.lf-bio-divider {
  width: 100%;
  margin: 8px 0 4px;
  border: 0;
  border-top: 1px solid rgba(255, 255, 255, 0.07);
}
.lf-bio-fallback {
  width: 100%;
  text-align: left;
}
.lf-bio-fallback summary {
  font-size: 11px;
  color: #a78bfa;
  cursor: pointer;
  list-style: none;
  padding: 4px 0;
  text-align: center;
  user-select: none;
}
.lf-bio-fallback summary::-webkit-details-marker {
  display: none;
}
.lf-bio-fallback summary:hover {
  color: #c8c0ff;
}
.lf-bio-fallback[open] {
  display: grid;
  gap: 8px;
}
.lf-bio-fallback[open] summary {
  margin-bottom: 4px;
}
.lf-bio-row input {
  width: 100%;
  box-sizing: border-box;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 8px;
  padding: 9px 12px;
  font-size: 13px;
  color: #f0eeff;
  outline: none;
  transition: border-color 0.15s;
}
.lf-bio-row input:focus {
  border-color: #7c6cff;
}
.lf-bio-submit {
  width: 100%;
  padding: 9px;
  background: linear-gradient(135deg, #7c6cff, #ff6c8a);
  color: white;
  border: none;
  border-radius: 8px;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
}

@media (prefers-reduced-motion: reduce) {
  .lf-bio,
  .lf-bio * {
    animation: none !important;
  }
}