.payment-card {
  border: 1px solid #eee;
  border-radius: 10px;
  padding: 16px;
  cursor: pointer;
  display: flex;
  gap: 12px;
  align-items: center;
  transition: all 0.2s;
}

.payment-card:hover {
  border-color: #1890ff;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.custom-select {
  min-width: 70px;
  border: 1px solid #d1d5db; /* xám */
  border-radius: 999px; /* bo tròn giống hình */
  padding: 6px 14px;
  font-size: 14px;
  box-shadow: none;
}

/* khi click / focus */
.custom-select:focus {
  border-color: #3b82f6; /* xanh */
  box-shadow: 0 0 0 1px #3b82f6;
}

/* hover nhẹ */
.custom-select:hover {
  border-color: #9ca3af;
}