<form class="lf-side">
  <aside class="lf-side-brand">
    <div class="lf-side-shape"></div>
    <div class="lf-side-logo">CF</div>
    <div class="lf-side-tag">Build the front-end<br />you've been imagining.</div>
  </aside>
  <div class="lf-side-form">
    <div class="lf-side-title">Sign in</div>
    <input type="email" placeholder="Work email" required />
    <input type="password" placeholder="Password" required />
    <button type="submit">Continue →</button>
    <a href="#" class="lf-side-foot">Forgot your password?</a>
  </div>
</form>

.lf-side {
  display: grid;
  grid-template-columns: 110px 1fr;
  width: 100%;
  max-width: 360px;
  min-height: 280px;
  background: #15151d;
  border: 1px solid rgba(255, 255, 255, 0.07);
  border-radius: 14px;
  overflow: hidden;
}
.lf-side-brand {
  position: relative;
  overflow: hidden;
  background: linear-gradient(160deg, #7c6cff 0%, #5b48d6 60%, #2a1f7a 100%);
  padding: 18px 14px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  color: white;
}
.lf-side-shape {
  position: absolute;
  top: -30px;
  right: -30px;
  width: 120px;
  height: 120px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.25) 0%, transparent 60%);
  animation: lfsBlob 8s ease-in-out infinite alternate;
}
@keyframes lfsBlob {
  0% {
    transform: translate(0, 0) scale(1);
  }
  100% {
    transform: translate(-10px, 12px) scale(1.15);
  }
}
.lf-side-logo {
  font-size: 20px;
  font-weight: 800;
  letter-spacing: 0.04em;
  background: rgba(255, 255, 255, 0.18);
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  backdrop-filter: blur(8px);
}
.lf-side-tag {
  font-size: 11px;
  line-height: 1.5;
  opacity: 0.92;
}
.lf-side-form {
  padding: 24px 22px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.lf-side-title {
  font-size: 16px;
  font-weight: 700;
  color: #f0eeff;
  margin-bottom: 4px;
}
.lf-side-form input {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 8px;
  padding: 9px 12px;
  color: #f0eeff;
  font-size: 13px;
  outline: none;
  transition: border-color 0.15s;
}
.lf-side-form input:focus {
  border-color: #7c6cff;
}
.lf-side-form button {
  margin-top: 4px;
  padding: 10px;
  background: linear-gradient(135deg, #7c6cff, #ff6c8a);
  color: white;
  border: none;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
}
.lf-side-foot {
  font-size: 11px;
  color: #a78bfa;
  text-decoration: none;
  text-align: center;
  margin-top: 2px;
}

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