ecshop 中的href="{$ecs_css_path}"，样式定义文件
includes里的init.php的187-194行

if (!empty($_CFG['stylename']))
    {
        $smarty->assign('ecs_css_path', 'themes/' . $_CFG['template'] . '/style_' . $_CFG['stylename'] . '.css');
    }
    else
    {
        $smarty->assign('ecs_css_path', 'themes/' . $_CFG['template'] . '/style.css');
    }