No styles working for any theme

The url of my blog is http://interactiveblend.com/blog/. I’m not sure what happened, but yesterday I looked and none of the styles were working for any theme. The plug-ins and pages all work, but the css is broken. I viewed the source, and the style sheet is pointing to http:///blog/wp-content/themes/minimalism/style.css instead of http://interactiveblend.com/blog/wp-content/themes/minimalism/style.css (working). Does anyone know why this happened or how to fix it?