@media {}
@media screen and (min-width: 320px) {}

----------------------------------------------------

[
	["atrule", [
		"@media"
	]],
	["punctuation", "{"], ["punctuation", "}"],

	["atrule", [
		"@media screen and ",
		["punctuation", "("],
		"min-width",
		["punctuation", ":"],
		" 320px",
		["punctuation", ")"]
	]],
	["punctuation", "{"], ["punctuation", "}"]
]

----------------------------------------------------

Checks for at-rules.