body {
  font-family: "Poppins", sans-serif;
  background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
  min-height: 100vh;
}

.container {
  padding-top: 2rem;
  padding-bottom: 2rem;
}

.card {
  border: none;
  border-radius: 15px;
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
  overflow: hidden;
}

.card-header {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  padding: 1.5rem;
  border-bottom: none;
}

.card-header h4 {
  font-weight: 600;
  margin: 0;
  font-size: 1.5rem;
  color: white;
}

.card-body {
  padding: 2rem;
  background: #ffffff;
}

.form-label {
  font-weight: 500;
  color: #444;
}

.form-control,
.form-select {
  border-radius: 8px;
  padding: 0.75rem 1rem;
  border: 2px solid #e1e1e1;
  transition: all 0.3s ease;
}

.form-control:focus,
.form-select:focus {
  border-color: #667eea;
  box-shadow: 0 0 0 0.2rem rgba(102, 126, 234, 0.15);
}

.input-group-text {
  background: #667eea;
  color: white;
  border: none;
  border-radius: 8px 0 0 8px;
  padding: 0.5rem 1rem;
}

.btn-primary {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  border: none;
  padding: 0.75rem 2rem;
  font-weight: 500;
  border-radius: 8px;
  transition: all 0.3s ease;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

.alert {
  border-radius: 8px;
  border: none;
}

.alert-success {
  background: #d4edda;
  color: #155724;
}

.alert-danger {
  background: #f8d7da;
  color: #721c24;
}

.form-floating {
  margin-bottom: 1rem;
}

.text-muted {
  font-size: 0.85rem;
}

/* Animasi untuk card */
.card {
  animation: slideIn 0.5s ease-out;
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Responsif untuk smartphone */
@media (max-width: 768px) {
  .container {
    padding-top: 1rem;
    padding-bottom: 1rem;
  }

  .card-body {
    padding: 1.5rem;
  }

  .card-header h4 {
    font-size: 1.25rem;
  }

  .btn-primary {
    width: 100%;
    padding: 0.75rem;
  }
}

/* Custom file input */
.custom-file-input::-webkit-file-upload-button {
  visibility: hidden;
}

.custom-file-input::before {
  content: "Pilih File";
  display: inline-block;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  padding: 0.5rem 1rem;
  border-radius: 4px;
  cursor: pointer;
}

.custom-file-input:hover::before {
  background: linear-gradient(135deg, #764ba2 0%, #667eea 100%);
}