.login-modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  backdrop-filter: blur(4px);
  z-index: 1000;
  display: none;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity 0.2s ease;
}
.login-modal-backdrop.active {
  display: flex;
  opacity: 1;
}
.login-modal {
  background: white;
  border-radius: 1rem;
  box-shadow: 0 25px 50px -12px rgba(0,0,0,0.25);
  max-width: 420px;
  width: 90%;
  transform: scale(0.95);
  transition: transform 0.2s ease;
}
.login-modal-backdrop.active .login-modal {
  transform: scale(1);
}