/* calculator style.css */

main {
  background-color: skyblue;
  padding: 1em;
}

/*
[command] code {
  background-color: lightgray;
	margin: 1em auto;
	padding: 0.25em;
}
*/

[calculator] {
	display: grid;
	justify-content: center;
}

[visually-hidden] {
	/* https://a11yproject.com/posts/how-to-hide-content/ */
	position: absolute !important;
	height: 1px;
	width: 1px;
	overflow: hidden;
	clip: rect(1px 1px 1px 1px); /* IE6, IE7 */
	/* clip: rect(1px, 1px, 1px, 1px); */
	white-space: nowrap; /* added line */
}

[equation] {
	background-color: transparent;
	color: white;
	font-family: Arial;
	font-weight: normal;
	
	grid-column: span 4;
	
	min-height: 1.5em;
	padding: 0 0.75em;
	text-align: right;
}

[display] {
  background-color: azure;
	background-color: whitesmoke;

  border: 1px solid deepskyblue;
  border-radius: 5px;
  font-size: 1.25em;
	
	grid-column: span 4;
	
  padding: 1em 0.5em 0.5em;
  text-align: right;
}

[keypad] {
  background-color: azure;
	background-color: whitesmoke;

	border: 1px solid skyblue;
  border-radius: 5px;
  grid-column: span 4;
  padding: 2px;

	/* control the button layout */

	display: grid;
  grid-gap: 2px 1.5px;
  grid-template-columns: 1fr 1fr 1fr 1fr;
}

[keypad] button {
  background-color: gainsboro;
	background-color: #fcfcfc;

  border: 1px solid lightgrey;
  border-radius: 5px;
  font-size: 1.25em;
	min-height: 1.75em;
	min-width: 3.5em;
  padding: 1em;
}

[keypad] [action="reset"] {
  grid-column: 1 / 3;
}

[keypad] [action]:not([action="negate"]) {
  background-color: deepskyblue;
	background-color: lightgray;
}

[keypad] :active,
[keypad] :hover,
[keypad] :focus {
  background-color: lightblue;
}

[action]:not([action="negate"]):active,
[action]:not([action="negate"]):hover,
[action]:not([action="negate"]):focus {
  background-color: lightskyblue;
}

[action][action="calculate"]:not(:empty) {
	background-color: lightskyblue;
}

[action][action="calculate"]:active,
[action][action="calculate"]:hover,
[action][action="calculate"]:focus {
	background-color: deepskyblue;
}

.article {
	font-family: Arial, Helvetica, sans-serif;
	padding: 3% 10% 0 0;
}