.tools() {
	&::before {
		content: " ";
		position: absolute;
		top: 0;
		left: 0;
		width: 100%;
		height: 31px;
		background-color: var(--highlight-tools-bg-color);
	}

	.code-tools {
		position: absolute;
		top: 0;
		right: 10px;
		height: 30px;
		line-height: 30px;
		user-select: none;
		color: var(--highlight-tools-color);

		.code-lang {
			font-weight: bolder;
			font-size: 1.05em;
			text-transform: uppercase;
		}

		.copy-button {
			cursor: pointer;
			font-weight: bolder;
			font-size: 1.05em;
			.transition-mixin();

			&:hover {
				color: var(--primary);
			}
		}

		&.mac-style {
			.code-lang + .copy-button {
				display: none;
			}
		}

		&.default-style {
			left: 10px;

			.code-lang {
				float: left;
			}

			.copy-button {
				float: right;
			}
		}
	}

	&:hover {
		/* box-shadow: 1px 1px 4px 0 #0000000e; */

		.code-tools.mac-style {
			.code-lang {
				display: none;
			}

			.copy-button {
				display: inherit;
			}
		}
	}
}

/* code title */
.caption() {
	position: absolute;
	top: 0;
	right: 0;
	left: 0;
	margin: 0 auto;
	line-height: 30px;
	width: fit-content;
	font-weight: bold;
	user-select: none;
	letter-spacing: 0;
	color: var(--highlight-tools-color);

	a {
		background: transparent !important;
		margin-left: 4px;

		&::before {
			content: "[";
		}

		&::after {
			content: "]";
		}
	}
}

/* mac style title */
.mac() {
	& when (@highlightTitleStyle=mac) {
		&::after {
			content: " ";
			position: absolute;
			border-radius: 50%;
			background: #ff5f56;
			width: 12px;
			height: 12px;
			top: 9px;
			left: 12px;
			-webkit-box-shadow:
				20px 0 #ffbd2e,
				40px 0 #27c93f;
			box-shadow:
				20px 0 #ffbd2e,
				40px 0 #27c93f;
		}
	}
}

/* max height */
.height_limit() {
	/* & when(isnumber(@highlightHeightLimit)) {
        max-height: unit(@highlightHeightLimit, px);
    } */

	.code-expand-btn {
		@height: 24px;
		position: absolute;
		z-index: 10;
		bottom: 0;
		left: 0;
		font-size: 16px;
		height: @height;
		line-height: @height;
		font-weight: bold;
		width: 100%;
		color: var(--highlight-foreground);
		background: linear-gradient(0, var(--highlight-gutter-bg-color), transparent);
		text-align: center;
		cursor: pointer;
		animation: code-expand-key 2s infinite;

		& ~ pre,
		& ~ table {
			margin-bottom: @height;
		}

		&.expand-done {
			background: linear-gradient(0, transparent, var(--highlight-gutter-bg-color));
			transform: rotate(180deg);
		}

		&:not(.expand-done) ~ pre,
		&:not(.expand-done) ~ table {
			margin-bottom: 0;
			overflow: hidden;

			& when(isnumber(@highlightHeightLimit)) {
				height: unit(@highlightHeightLimit, px);
			}
		}

		svg {
			margin: 0;
			display: initial;
		}
	}

	@keyframes code-expand-key {
		0% {
			opacity: 0.6;
		}

		50% {
			opacity: 0.1;
		}

		100% {
			opacity: 0.6;
		}
	}
}