some idea I do not remember

min/lib/Minify/CSS/Filter/BubbleImports.php

@@ -0,0 +1,39 @@
+<?php
+/**
+ * Class Minify_CSS_Filter_BubbleImports
+ * @package Minify
+ */
+
+/**
+ * CSS filter that moves @import statements to the top of the CSS
+ * 
+ * @package Minify
+ */
+class Minify_CSS_Filter_BubbleImports {
+
+    /**
+     * @param string $css
+     * @return string
+     */
+    public static function filter($css) {
+
+		$importStatements = array();
+
+		$collect = function($matches) use (&$importStatements) {
+			$importStatements[] = $matches[0];
+			$media = '';
+			if (trim($matches[2])) {
+				$media = ' for media:' . $matches[2];
+			}
+			return '/* replaced import "'.$matches[1].'"'.$media.' */';
+		};
+
+		$css = preg_replace_callback(Minify_ImportProcessor::IMPORT_STATEMENT_REGEX, $collect, $css);
+
+		if ($importStatements) {
+			$css = join("\n", $importStatements) . "\n" . $css;
+		}
+
+		return $css;
+	}
+}