<div class="lf-flip">
  <input type="checkbox" id="lf-flip-toggle" class="lf-flip-toggle" />
  <div class="lf-flip-stage">
    <form class="lf-flip-front">
      <div class="lf-flip-title">Sign in</div>
      <input type="email" placeholder="Email" required />
      <input type="password" placeholder="Password" required />
      <button type="submit">Log in</button>
      <label for="lf-flip-toggle" class="lf-flip-link">Forgot password?</label>
    </form>
    <form class="lf-flip-back">
      <div class="lf-flip-title">Reset password</div>
      <input type="email" placeholder="Email to send reset link" required />
      <button type="submit">Send link</button>
      <label for="lf-flip-toggle" class="lf-flip-link">← Back to sign in</label>
    </form>
  </div>
</div>

.lf-flip {
  width: 100%;
  max-width: 280px;
  perspective: 1200px;
}
.lf-flip-toggle {
  display: none;
}
.lf-flip-stage {
  position: relative;
  width: 100%;
  transform-style: preserve-3d;
  transition: transform 0.7s cubic-bezier(0.5, 0, 0.3, 1.2);
  min-height: 240px;
}
.lf-flip-toggle:checked ~ .lf-flip-stage {
  transform: rotateY(180deg);
}
.lf-flip-front,
.lf-flip-back {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 24px 22px;
  background: #15151d;
  border: 1px solid rgba(255, 255, 255, 0.07);
  border-radius: 14px;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
}
.lf-flip-back {
  transform: rotateY(180deg);
}
.lf-flip-title {
  font-size: 16px;
  font-weight: 700;
  color: #f0eeff;
  margin-bottom: 2px;
}
.lf-flip input {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 8px;
  padding: 10px 12px;
  color: #f0eeff;
  font-size: 13px;
  outline: none;
  transition: border-color 0.15s;
}
.lf-flip input:focus {
  border-color: #7c6cff;
}
.lf-flip button {
  background: linear-gradient(135deg, #7c6cff, #ff6c8a);
  color: white;
  border: none;
  border-radius: 8px;
  padding: 10px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
}
.lf-flip-link {
  font-size: 11px;
  color: #a78bfa;
  text-align: center;
  cursor: pointer;
  margin-top: 4px;
}