Some readers have asked to me what is the better way to organize a CSS file to optimize code readability and simplify code management. Generally, I adopt just some simple rules and, it's my opinion, they are useful in order not to become crazy if you have to manage a CSS file for a page/site with a complex design. In this post, I discuss for simplicity a typical two columns fixed layout like this:
一些读者曾问我如何以更好的方式组织CSS文件来改善代码的可读性并简化代码的管理。一般情况下，我只采用几个简单的规则，但我认为很有用，因为当你不得不去管理一个有着复杂设计的页面/站点的CSS文件时，它可以避免让你抓狂。在这里，我将简单探讨如下所示的典型的两列固定宽度布局：
Step 1: redefine HTML elements
I think it's a good rule to redefine HTML elements (body, a, form, input...) in the first rows of your CSS files.
第一步：重定义HTML标签
我认为在CSS文件前面几行重新定义HTML标签（body, a, form, input...）是一个好规则。
Example Source Code
/* ------------------------------- */
/* HTML Elements
/* ------------------------------- */
html {font-family:arial, verdana, sans serif; font-size:13px;}
a:link, a:visited{color:#0033CC;}
a:hover{color:#003366;}
h1, h2, h3, h4, h5, h6,
form, input, text-area{
border:0; padding:0; margin:0;
font-family:arial, verdana, sans serif;}
h1{font-size:24px; color:#000000;}
h2{font-size:18px; color:#666666;}
...
Step 2: define page elements
In order to improve code readability, I suggest to indent all elements but with some sagacities: if an element have just two-three attributes (for example #navbar), you can use a single line to declare all properties, otherwise it's better to declare every single property in a new line (for example see #navbar li a:link, #navbar li a:visited):
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