/* button */
  #btnSubmit {
  background: linear-gradient(45deg, #212529, #343a40); /* Gradasi abu gelap */
  color: #fff;
  border: none;
  transition: all 0.4s ease;
  letter-spacing: 1px;
}

#btnSubmit:hover {
  background: linear-gradient(45deg, #787878, #212529);
  transform: translateY(-3px) scale(1.03);
  box-shadow: 0 6px 18px rgba(0,0,0,0.5);
}

#btnSubmit:active {
  transform: scale(0.95);
  box-shadow: 0 2px 6px rgba(0,0,0,0.3);
}

/* Input field */
.form-control {
  transition: all 0.3s ease;
  border: 1px solid transparent;
  border-radius: 8px;
}

.form-control:focus {
  background-color: rgba(189, 255, 255, 1);
  border-color: #4a90e2;
  box-shadow: 0 0 8px rgba(74, 144, 226, 0.6);
  transform: scale(1.02);
}

/* Checkbox */
.form-check-input {
  transition: transform 0.2s ease, box-shadow 0.3s ease;
  cursor: pointer;
}

.form-check-input:checked {
  transform: scale(1.2);
  box-shadow: 0 0 6px rgba(74, 144, 226, 0.6);
}

/* Tombol Login */
#btnSubmit {
  background: linear-gradient(45deg, #212529, #343a40);
  color: #fff;
  border: none;
  transition: all 0.4s ease;
  box-shadow: 0 4px 12px rgba(0,0,0,0.3);
  letter-spacing: 1px;
}

#btnSubmit:hover {
  background: linear-gradient(45deg, #343a40, #212529);
  transform: translateY(-3px) scale(1.03);
  box-shadow: 0 6px 18px rgba(0,0,0,0.5);
}

#btnSubmit:active {
  transform: scale(0.95);
  box-shadow: 0 2px 6px rgba(0,0,0,0.3);
}

p a {
  position: relative;
  font-weight: 400;
  transition: color 0.3s ease;
}

p a:hover {
  color: #0056b3; /* lebih gelap saat hover */
}

/* Efek underline animasi */
p a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 0%;
  height: 2px;
  background-color: #0d6efd; /* biru bootstrap */
  transition: width 0.3s ease;
}

p a:hover::after {
  width: 100%;
}

.fade-in-up {
  opacity: 0;
  transform: translateY(30px);
  animation: fadeInUp 1.5s ease-out forwards;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}