.topup-container {
  padding: 30px 20px;
  min-height: calc(100vh - 120px);
  display: flex;
  justify-content: center;
  align-items: center;
}

.form-card {
  width: 100%;
  max-width: 420px;
  background: var(--gradient-primary);
  border-radius: 20px;
  box-shadow: 0 8px 24px rgba(99, 102, 241, 0.3);
  padding: 35px 25px;
  color: #fff;
  text-align: center;
  transition: all 0.3s ease;
}

.form-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 28px rgba(99, 102, 241, 0.4);
}

.form-card h3 {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 10px;
}

.form-card p {
  font-size: 14px;
  opacity: 0.9;
  margin-bottom: 25px;
}

.form-group {
  text-align: left;
  margin-bottom: 20px;
}

.form-group label {
  font-size: 13px;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.9);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.form-control {
  width: 100%;
  padding: 12px 14px;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 10px;
  color: #fff;
  font-size: 15px;
  outline: none;
  transition: all 0.3s ease;
}

.form-control::placeholder {
  color: rgba(255, 255, 255, 0.6);
}

.form-control:focus {
  background: rgba(255, 255, 255, 0.15);
  border-color: #fff;
  box-shadow: 0 0 8px rgba(255, 255, 255, 0.25);
}

.btn-submit {
  width: 100%;
  background: linear-gradient(135deg, #22c55e, #16a34a);
  border: none;
  color: #fff;
  padding: 14px;
  border-radius: 12px;
  font-weight: 600;
  font-size: 16px;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: 0 6px 18px rgba(34, 197, 94, 0.25);
}

.btn-submit:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 22px rgba(34, 197, 94, 0.35);
}

.btn-submit.loading i {
  animation: spin 1s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}