<form class="lf-aurora">
  <div class="lf-aurora-bg"></div>
  <div class="lf-aurora-card">
    <div class="lf-aurora-title">Welcome back</div>
    <div class="lf-aurora-sub">Sign in to continue</div>
    <label class="lf-aurora-field">
      <input type="email" placeholder=" " required />
      <span>Email address</span>
    </label>
    <label class="lf-aurora-field">
      <input type="password" placeholder=" " required />
      <span>Password</span>
    </label>
    <button type="submit" class="lf-aurora-btn">Sign in →</button>
    <div class="lf-aurora-foot">No account? <a href="#">Create one</a></div>
  </div>
</form>

.lf-aurora {
  position: relative;
  width: 100%;
  max-width: 320px;
  border-radius: 18px;
  overflow: hidden;
  isolation: isolate;
}
.lf-aurora-bg {
  position: absolute;
  inset: -40%;
  z-index: 0;
  background:
    radial-gradient(40% 40% at 30% 30%, #7c6cff 0%, transparent 60%),
    radial-gradient(50% 50% at 70% 70%, #ff6c8a 0%, transparent 60%),
    radial-gradient(60% 60% at 50% 50%, #2eb88a 0%, transparent 60%);
  filter: blur(40px) saturate(140%);
  animation: lfaDrift 14s ease-in-out infinite alternate;
}
@keyframes lfaDrift {
  0% {
    transform: translate3d(0, 0, 0) rotate(0deg);
  }
  100% {
    transform: translate3d(-8%, -4%, 0) rotate(8deg);
  }
}
.lf-aurora-card {
  position: relative;
  z-index: 1;
  background: rgba(15, 15, 19, 0.55);
  backdrop-filter: blur(18px) saturate(160%);
  -webkit-backdrop-filter: blur(18px) saturate(160%);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 18px;
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.lf-aurora-title {
  font-size: 18px;
  font-weight: 700;
  color: #f0eeff;
}
.lf-aurora-sub {
  font-size: 12px;
  color: #b8b6d4;
  margin-top: -10px;
}
.lf-aurora-field {
  position: relative;
  display: block;
}
.lf-aurora-field input {
  width: 100%;
  box-sizing: border-box;
  padding: 14px 12px 10px;
  font-size: 13px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 10px;
  color: #f0eeff;
  outline: none;
  transition:
    border-color 0.2s,
    background 0.2s;
}
.lf-aurora-field input:focus {
  border-color: #7c6cff;
  background: rgba(124, 108, 255, 0.08);
}
.lf-aurora-field span {
  position: absolute;
  left: 12px;
  top: 12px;
  font-size: 12px;
  color: #b8b6d4;
  pointer-events: none;
  transition:
    transform 0.2s,
    color 0.2s,
    font-size 0.2s;
}
.lf-aurora-field input:focus + span,
.lf-aurora-field input:not(:placeholder-shown) + span {
  transform: translateY(-9px);
  font-size: 9px;
  color: #a78bfa;
  letter-spacing: 0.08em;
}
.lf-aurora-btn {
  margin-top: 4px;
  padding: 11px 14px;
  background: linear-gradient(135deg, #7c6cff, #ff6c8a);
  color: white;
  font-size: 13px;
  font-weight: 600;
  border: none;
  border-radius: 10px;
  cursor: pointer;
  box-shadow: 0 6px 24px -8px rgba(124, 108, 255, 0.7);
  transition:
    transform 0.15s,
    box-shadow 0.25s;
}
.lf-aurora-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 10px 32px -8px rgba(124, 108, 255, 0.9);
}
.lf-aurora-foot {
  font-size: 11px;
  color: #b8b6d4;
  text-align: center;
}
.lf-aurora-foot a {
  color: #a78bfa;
  text-decoration: none;
}

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