preserve space before non-parenthesized media query expression - fixes #759

src/css/Stylesheet.ts

@@ -144,7 +144,8 @@ class Atrule {
 
 	minify(code: MagicString, cascade: boolean) {
 		if (this.node.name === 'media') {
-			let c = this.node.start + 6;
+			const expressionChar = code.original[this.node.expression.start];
+			let c = this.node.start + (expressionChar === '(' ? 6 : 7);
 			if (this.node.expression.start > c) code.remove(c, this.node.expression.start);
 
 			this.node.expression.children.forEach((query: Node) => {

test/css/samples/media-query-word/expected.css

@@ -0,0 +1 @@
+@media only screen and (min-width: 400px){[svelte-xyz].large-screen,[svelte-xyz] .large-screen{display:block}}

test/css/samples/media-query-word/input.html

@@ -0,0 +1,9 @@
+<div class='large-screen'>animated</div>
+
+<style>
+	@media only screen and (min-width: 400px) {
+		.large-screen {
+			display: block;
+		}
+	}
+</style>