#toggle-sidebar {
	position: fixed;
	left: 0;
	top: 20px;
	background: var(--button-hover);
	border: 2px solid #a4d1c4;
	border-radius: 0 15px 15px 0;
	padding: 8px 12px;
	cursor: pointer;
	z-index: 1002;
	font-size: 1.3rem;
	user-select: none;
	outline: none;
	transition:
		transform var(--duration-short) var(--ease-out-quad),
		background-color var(--duration-short) var(--ease-out-quad),
		box-shadow var(--duration-short) var(--ease-out-quad);
	will-change: transform;
	contain: layout size style;
	transform: translateZ(0);
	box-sizing: border-box;
	transform-origin: left center;
	width: 48px;
	height: 40px;
	display: flex;
	align-items: center;
	justify-content: center;
	backface-visibility: hidden;
}

.sidebar:not(.js-initialized) #toggle-sidebar,
.sidebar:not(.js-initialized).collapsed #toggle-sidebar {
	transform: translateZ(0);
	border-radius: 0 15px 15px 0;
}

#toggle-sidebar img {
	width: 24px;
	height: 24px;
	color: var(--text-color);
	transition:
		color var(--duration-short) var(--ease-default),
		transform var(--duration-short) var(--ease-default);
	display: none;
	flex-shrink: 0;
	will-change: transform;
}

.sidebar.collapsed #toggle-sidebar .show-panel {
	display: block;
}

.sidebar:not(.collapsed) #toggle-sidebar .hide-panel {
	display: block;
}

@media (hover: hover) and (pointer: fine) {
	#toggle-sidebar:hover {
		background-color: var(--button-hover);
		box-shadow: var(--theme-shadow-hover);
	}

	#toggle-sidebar:hover img {
		transform: scale(1.1);
		transition: transform var(--duration-short) var(--ease-out-quad);
	}

	.sidebar:not(.collapsed) #toggle-sidebar:hover {
		transform: translateX(160px) translateZ(0);
	}
}

.sidebar:not(.collapsed) #toggle-sidebar {
	transform: translateX(160px) translateZ(0);
	border-radius: 15px;
}

.sidebar.collapsed #toggle-sidebar {
	transform: translateZ(0);
	border-radius: 0 15px 15px 0;
}

/* 注意: 1023px 对应 BREAKPOINT_SIDEBAR (1024px) - 1 */
@media screen and (max-width: 1023px) {
	.sidebar.collapsed #toggle-sidebar,
	.sidebar:not(.js-initialized) #toggle-sidebar {
		transform: translateZ(0);
		border-radius: 0 15px 15px 0;
	}
}

#toggle-sidebar:focus-visible {
	outline: 2px solid var(--link-color);
	outline-offset: 2px;
	box-shadow: 0 0 0 4px rgba(43, 195, 206, 0.2);
	border-radius: 4px;
}

@media (hover: none) and (pointer: coarse) {
	#toggle-sidebar:focus,
	#toggle-sidebar:active {
		background: var(--button-hover);
		border: 1.5px solid #a4d1c4;
		outline: none;
	}
}