/* UI Component: Nút đóng dùng chung hệ thống */
.ui-btn-close {
  background: none;
  border: none;
  font-size: 18px;
  font-weight: bold;
  cursor: pointer;
  color: #999;
  padding: 6px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: color 0.2s ease, transform 0.1s ease;
  line-height: 1;
  outline: none;
  user-select: none;
}

.ui-btn-close:hover {
  color: #333;
}

.ui-btn-close:active {
  transform: scale(0.92);
}