style.scss

.components-button {
	display: inline-flex;
	text-decoration: none;
	font-size: $default-font-size;
	margin: 0;
	border: 0;
	cursor: pointer;
	-webkit-appearance: none;
	background: none;
	transition: box-shadow 0.1s linear;
	@include reduce-motion("transition");
	height: $icon-button-size;
	align-items: center;
	box-sizing: border-box;
	padding: 0 8px;
	overflow: hidden;
	border-radius: 3px;
	color: $dark-gray-500;

	&:not(:disabled):not([aria-disabled="true"]):not(.is-secondary):not(.is-primary):not(.is-tertiary):not(.is-link):hover {
		@include button-style__hover;
	}

	// Default button style
	&.is-secondary {
		border-width: $border-width;
		border-style: solid;
		white-space: nowrap;
		color: color(theme(button) shade(6%));
		border-color: color(theme(button) shade(6%));
		background: #f3f5f6;

		&:not(:disabled):not([aria-disabled="true"]):hover {
			background: #f1f1f1;
			border-color: color(theme(button) shade(25%));
			color: color(theme(button) shade(25%));
			text-decoration: none;
		}

		&:focus:enabled {
			background: #f3f5f6;
			color: color(theme(button) shade(25%));
			border-color: color(theme(button) shade(5%));
			box-shadow: 0 0 0 $border-width color(theme(button) shade(5%));
			text-decoration: none;

		}

		&:not([aria-disabled="true"]):active:enabled {
			background: #f3f5f6;
			color: color(theme(button) shade(5%));
			border-color: #7e8993;
			box-shadow: none;
		}

		&:disabled,
		&[aria-disabled="true"] {
			color: #a0a5aa;
			border-color: #ddd;
			background: #f7f7f7;
			text-shadow: 0 $border-width 0 #fff;
			transform: none;
			opacity: 1;
		}
	}

	&.is-primary {
		border-width: $border-width;
		border-style: solid;
		white-space: nowrap;
		background: color(theme(button));
		border-color: color(theme(button));
		color: $white;
		text-decoration: none;
		text-shadow: none;

		&:not(:disabled):not([aria-disabled="true"]):hover,
		&:focus:enabled {
			background: color(theme(button) shade(10%));
			border-color: color(theme(button) shade(10%));
			color: $white;
		}

		&:focus:enabled {
			box-shadow:
				0 0 0 $border-width $white,
				0 0 0 3px color(theme(button));
		}

		&:not([aria-disabled="true"]):active:enabled {
			background: color(theme(button) shade(20%));
			border-color: color(theme(button) shade(20%));
			color: $white;
		}

		&:disabled,
		&:disabled:active:enabled,
		&[aria-disabled="true"],
		&[aria-disabled="true"]:enabled, // This catches a situation where a Button is aria-disabled, but not disabled.
		&[aria-disabled="true"]:active:enabled {
			color: color(theme(button) tint(40%));
			background: color(theme(button) tint(10%));
			border-color: color(theme(button) tint(10%));
			opacity: 1;

			&:focus:enabled {
				box-shadow:
					0 0 0 $border-width $white,
					0 0 0 3px color(theme(button));
			}
		}

		&.is-busy,
		&.is-busy:disabled,
		&.is-busy[aria-disabled="true"] {
			color: $white;
			background-size: 100px 100%;
			// Disable reason: This function call looks nicer when each argument is on its own line.
			/* stylelint-disable */
			background-image: linear-gradient(
				-45deg,
				theme(button) 28%,
				color(theme(button) shade(20%)) 28%,
				color(theme(button) shade(20%)) 72%,
				theme(button) 72%
			);
			/* stylelint-enable */
			border-color: color(theme(button));
		}
	}

	/* Buttons that look like links, for a cross of good semantics with the visual */
	&.is-link {
		margin: 0;
		padding: 0;
		box-shadow: none;
		border: 0;
		border-radius: 0;
		background: none;
		outline: none;
		text-align: left;
		/* Mimics the default link style in common.css */
		color: #0073aa;
		text-decoration: underline;
		transition-property: border, background, color;
		transition-duration: 0.05s;
		transition-timing-function: ease-in-out;
		@include reduce-motion("transition");
		height: auto;

		&:not(:disabled):not([aria-disabled="true"]):hover,
		&:not([aria-disabled="true"]):active {
			color: #00a0d2;
		}

		&:focus {
			color: #124964;
			box-shadow:
				0 0 0 $border-width #5b9dd9,
				0 0 2px $border-width rgba(30, 140, 190, 0.8);
		}
	}

	/* Link buttons that are red to indicate destructive behavior. */
	&.is-link.is-destructive {
		color: $alert-red;
	}

	&:not([aria-disabled="true"]):active {
		color: inherit;
	}

	&:disabled,
	&[aria-disabled="true"] {
		cursor: default;
		opacity: 0.3;
	}

	&:focus:not(:disabled) {
		@include button-style__focus-active;
	}

	&.is-busy,
	&.is-secondary.is-busy,
	&.is-secondary.is-busy:disabled,
	&.is-secondary.is-busy[aria-disabled="true"] {
		animation: components-button__busy-animation 2500ms infinite linear;
		background-size: 100px 100%;
		background-image: repeating-linear-gradient(-45deg, $light-gray-500, $white 11px, $white 10px, $light-gray-500 20px);
		opacity: 1;
	}

	&.is-small {
		height: 24px;
		line-height: 22px;
		padding: 0 8px;
		font-size: 11px;
	}

	// Buttons that are text-based.
	&.is-tertiary {
		color: theme(outlines);

		.dashicon {
			display: inline-block;
			flex: 0 0 auto;
		}

		&:not([aria-disabled="true"]):active:focus:enabled {
			box-shadow: none;
		}

		&:not(:disabled):not([aria-disabled="true"]):hover {
			color: color(theme(outlines) shade(25%));
		}
	}

	&.has-icon {
		.dashicon {
			display: inline-block;
			flex: 0 0 auto;
		}

		&.has-text svg {
			margin-right: 8px;
		}
	}

	svg {
		fill: currentColor;
		outline: none;
	}

	// Fixes a Safari+VoiceOver bug, where the screen reader text is announced not respecting the source order.
	// See https://core.trac.wordpress.org/ticket/42006 and https://github.com/h5bp/html5-boilerplate/issues/1985
	.screen-reader-text {
		height: auto;
	}
}

@keyframes components-button__busy-animation {
	0% {
		background-position: 200px 0;
	}
}