字符，验证器在某处窒息（即它看起来像一个空间，但它不是空间）。如果我直接查看您的CSS文件并将内容复制/粘贴到CSS验证器的直接输入验证，它会验证。

You have some sort of invisible character that the validator is choking on somewhere (ie. it looks and acts like a space, but it isn't the space). If I view your CSS file directly and copy/paste the contents into the CSS validator's direct input validation, it validates.