In your detailed.html template you would have to replace:
<meta name="description" content="my detailed page decription" />
<meta name="Keywords" content="my detailed page keywords" />
<link type="text/css" rel="stylesheet" href="http://www.my_css_file_location.com/static/luna/luna.css" />
What you have to remember though is that even if you do change this, all of your detailed pages will still have the same meta values unless you use tags in the description and keywords such as <%Title%>, etc.