/* Gaussian Fixed TOC — front end */
.gftoc-root,
.gftoc-root *,
.gftoc-root *::before,
.gftoc-root *::after {
	box-sizing: border-box;
}

.gftoc-root {
	--gftoc-edge-offset: 24px;
	--gftoc-scroll-offset: 96px;
	--gftoc-marker-color: #111827;
	--gftoc-accent-color: #2563eb;
	--gftoc-panel-background: #ffffff;
	--gftoc-panel-text: #111827;
	--gftoc-ease-out: cubic-bezier(.22, 1, .36, 1);
	--gftoc-marker-base-width: 12px;
	font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans TC", sans-serif;
	font-size: 16px;
	line-height: 1.4;
}

.gftoc-root a {
	text-decoration: none;
}

.gftoc-root button,
.gftoc-root a {
	-webkit-tap-highlight-color: transparent;
}

.gftoc-root [hidden] {
	display: none !important;
}

.gftoc-sr-only {
	position: absolute !important;
	width: 1px !important;
	height: 1px !important;
	padding: 0 !important;
	margin: -1px !important;
	overflow: hidden !important;
	clip: rect(0, 0, 0, 0) !important;
	white-space: nowrap !important;
	border: 0 !important;
}

.gftoc-anchor-alias {
	display: block;
	width: 0;
	height: 0;
	overflow: hidden;
	visibility: hidden;
}

/* Desktop fixed Gaussian rail ----------------------------------------- */
.gftoc-desktop {
	position: fixed;
	top: 50%;
	left: var(--gftoc-edge-offset);
	z-index: 9997;
	display: block;
	width: 18rem;
	max-width: calc(100vw - (var(--gftoc-edge-offset) * 2));
	color: var(--gftoc-marker-color);
	pointer-events: none;
	transform: translateY(-50%);
}

.gftoc-side-right .gftoc-desktop {
	right: var(--gftoc-edge-offset);
	left: auto;
}

.gftoc-rail {
	position: relative;
	width: 100%;
	min-height: 5rem;
	padding-block: .8rem;
	pointer-events: auto;
	isolation: isolate;
}

.gftoc-rail-list {
	display: flex;
	width: 7.25rem;
	max-height: min(64vh, 34rem);
	flex-direction: column;
	align-items: flex-start;
	gap: 0;
	margin: 0 !important;
	padding: 1rem 0 !important;
	overflow-x: visible;
	overflow-y: auto;
	overscroll-behavior: contain;
	list-style: none !important;
	scrollbar-width: none;
	-webkit-mask-image: linear-gradient(to bottom, transparent, #000 1rem, #000 calc(100% - 1rem), transparent);
	mask-image: linear-gradient(to bottom, transparent, #000 1rem, #000 calc(100% - 1rem), transparent);
}

.gftoc-side-right .gftoc-rail-list {
	margin-left: auto !important;
	align-items: flex-end;
}

.gftoc-rail-list::-webkit-scrollbar {
	display: none;
}

.gftoc-rail-item {
	position: relative;
	width: 100%;
	min-height: .66rem;
	flex: 0 0 .66rem;
	margin: 0 !important;
	padding: 0 !important;
	list-style: none !important;
}

.gftoc-marker-link {
	position: relative;
	display: flex;
	width: 100%;
	height: 100%;
	align-items: center;
	justify-content: flex-start;
	padding: 0 !important;
	border: 0;
	outline: 0;
	background: transparent;
	color: inherit;
	cursor: pointer;
	touch-action: none;
}

.gftoc-side-right .gftoc-marker-link {
	justify-content: flex-end;
}

.gftoc-marker-link::after {
	position: absolute;
	inset: -.1rem 0;
	content: "";
}

.gftoc-marker {
	display: block;
	width: var(--gftoc-marker-base-width);
	height: 2px;
	border-radius: 999px;
	background: currentColor;
	opacity: .28;
	transform: scaleX(var(--gftoc-marker-scale, 1));
	transform-origin: left center;
	transition: opacity 150ms ease, background-color 150ms ease;
	will-change: transform, opacity;
}

.gftoc-side-right .gftoc-marker {
	transform-origin: right center;
}

.gftoc-marker-link.is-passed .gftoc-marker {
	opacity: .48;
}

.gftoc-marker-link.is-active,
.gftoc-marker-link.is-nearest,
.gftoc-marker-link:focus-visible {
	color: var(--gftoc-accent-color);
}

.gftoc-marker-link.is-active .gftoc-marker,
.gftoc-marker-link.is-nearest .gftoc-marker,
.gftoc-marker-link:focus-visible .gftoc-marker {
	opacity: 1;
}

.gftoc-marker-link:focus-visible::before {
	position: absolute;
	left: -.42rem;
	width: .25rem;
	aspect-ratio: 1;
	content: "";
	border-radius: 50%;
	background: currentColor;
}

.gftoc-side-right .gftoc-marker-link:focus-visible::before {
	right: -.42rem;
	left: auto;
}

.gftoc-hover-label {
	position: absolute;
	top: 0;
	left: 7.75rem;
	display: grid;
	min-width: 9rem;
	max-width: min(17rem, calc(100vw - var(--gftoc-edge-offset) - 8.25rem));
	grid-template-columns: auto minmax(0, 1fr);
	align-items: baseline;
	gap: .58rem;
	padding: .55rem .68rem;
	border: 1px solid rgba(17, 24, 39, .1);
	border-radius: .72rem;
	background: var(--gftoc-panel-background);
	box-shadow: 0 .75rem 2.5rem rgba(15, 23, 42, .12);
	color: var(--gftoc-panel-text);
	pointer-events: none;
	opacity: 0;
	transform: translateY(var(--gftoc-label-y, 50%)) translateY(-50%) translateX(-.45rem);
	transition: opacity 150ms ease, transform 180ms var(--gftoc-ease-out);
	will-change: transform;
}

.gftoc-side-right .gftoc-hover-label {
	right: 7.75rem;
	left: auto;
	transform: translateY(var(--gftoc-label-y, 50%)) translateY(-50%) translateX(.45rem);
}

.gftoc-rail.is-label-visible .gftoc-hover-label {
	opacity: 1;
	transform: translateY(var(--gftoc-label-y, 50%)) translateY(-50%) translateX(0);
}

.gftoc-hover-index {
	font-size: .62rem;
	font-variant-numeric: tabular-nums;
	font-weight: 650;
	letter-spacing: .08em;
	opacity: .5;
}

.gftoc-hover-title {
	display: block;
	min-width: 0;
	font-family: Georgia, "Noto Serif TC", "Times New Roman", serif;
	font-size: .94rem;
	font-weight: 500;
	line-height: 1.18;
	text-wrap: balance;
}

/* Mobile fixed trigger and bottom sheet ------------------------------- */
.gftoc-mobile-trigger {
	position: fixed;
	right: max(var(--gftoc-edge-offset), env(safe-area-inset-right));
	bottom: max(1rem, env(safe-area-inset-bottom));
	z-index: 9998;
	display: none;
	min-height: 2.75rem;
	align-items: center;
	gap: .62rem;
	padding: .62rem .82rem;
	border: 1px solid rgba(17, 24, 39, .14);
	border-radius: 999px;
	background: var(--gftoc-panel-background);
	box-shadow: 0 .75rem 2.5rem rgba(15, 23, 42, .2);
	color: var(--gftoc-panel-text);
	font: inherit;
	font-size: .72rem;
	font-weight: 700;
	letter-spacing: .06em;
	line-height: 1;
	text-transform: uppercase;
	cursor: pointer;
}

.gftoc-side-left .gftoc-mobile-trigger {
	right: auto;
	left: max(var(--gftoc-edge-offset), env(safe-area-inset-left));
}

@supports ((-webkit-backdrop-filter: blur(14px)) or (backdrop-filter: blur(14px))) {
	.gftoc-mobile-trigger {
		background: color-mix(in srgb, var(--gftoc-panel-background) 82%, transparent);
		-webkit-backdrop-filter: blur(14px);
		backdrop-filter: blur(14px);
	}
}

.gftoc-mobile-trigger:focus-visible,
.gftoc-mobile-close:focus-visible,
.gftoc-mobile-link:focus-visible {
	outline: 3px solid var(--gftoc-accent-color);
	outline: 3px solid color-mix(in srgb, var(--gftoc-accent-color) 42%, transparent);
	outline-offset: 3px;
}

.gftoc-mobile-trigger-icon {
	display: inline-flex;
	width: 1rem;
	flex-direction: column;
	gap: 2px;
}

.gftoc-mobile-trigger-icon i {
	display: block;
	height: 1px;
	border-radius: 999px;
	background: currentColor;
}

.gftoc-mobile-trigger-icon i:nth-child(2) {
	width: 72%;
}

.gftoc-mobile-trigger-icon i:nth-child(3) {
	width: 46%;
}

.gftoc-mobile-trigger-count {
	font-variant-numeric: tabular-nums;
	font-weight: 600;
	opacity: .55;
}

.gftoc-mobile-layer {
	position: fixed;
	inset: 0;
	z-index: 100000;
	display: none;
	pointer-events: none;
}

.gftoc-mobile-layer.is-open {
	pointer-events: auto;
}

.gftoc-mobile-overlay {
	position: absolute;
	inset: 0;
	width: 100%;
	height: 100%;
	padding: 0;
	border: 0;
	background: rgba(8, 12, 20, .56);
	cursor: default;
	opacity: 0;
	transition: opacity 260ms ease;
}

.gftoc-mobile-layer.is-open .gftoc-mobile-overlay {
	opacity: 1;
}

.gftoc-mobile-panel {
	position: absolute;
	right: 0;
	bottom: 0;
	left: 0;
	display: flex;
	width: 100%;
	max-height: min(82dvh, 48rem);
	flex-direction: column;
	margin: 0;
	padding: 0;
	overflow: hidden;
	border: 0;
	border-radius: 1.3rem 1.3rem 0 0;
	outline: 0;
	background: var(--gftoc-panel-background);
	box-shadow: 0 -2rem 5rem rgba(0, 0, 0, .25);
	color: var(--gftoc-panel-text);
	transform: translateY(105%);
	transition: transform 360ms var(--gftoc-ease-out);
}

.gftoc-mobile-layer.is-open .gftoc-mobile-panel {
	transform: translateY(0);
}

.gftoc-mobile-header {
	display: flex;
	flex: 0 0 auto;
	align-items: center;
	justify-content: space-between;
	gap: 1rem;
	padding: 1.05rem 1.15rem .9rem;
	border-bottom: 1px solid rgba(17, 24, 39, .12);
}

.gftoc-mobile-kicker {
	display: block;
	margin-bottom: .12rem;
	font-size: .58rem;
	font-weight: 700;
	letter-spacing: .12em;
	opacity: .46;
	text-transform: uppercase;
}

.gftoc-mobile-header h2 {
	margin: 0 !important;
	padding: 0 !important;
	border: 0 !important;
	color: inherit !important;
	font-family: Georgia, "Noto Serif TC", "Times New Roman", serif;
	font-size: 1.35rem !important;
	font-weight: 500 !important;
	letter-spacing: -.01em;
	line-height: 1.15 !important;
}

.gftoc-mobile-close {
	display: grid;
	width: 2.45rem;
	min-width: 2.45rem;
	aspect-ratio: 1;
	place-items: center;
	padding: 0;
	border: 1px solid rgba(17, 24, 39, .16);
	border-radius: 50%;
	background: transparent;
	color: inherit;
	font: inherit;
	font-size: 1.25rem;
	line-height: 1;
	cursor: pointer;
}

.gftoc-mobile-list {
	max-height: 100%;
	flex: 1 1 auto;
	margin: 0 !important;
	padding: .55rem 1rem max(1.25rem, env(safe-area-inset-bottom)) !important;
	overflow-x: hidden;
	overflow-y: auto;
	overscroll-behavior: contain;
	list-style: none !important;
}

.gftoc-mobile-list > li {
	margin: 0 !important;
	padding: 0 !important;
	list-style: none !important;
}

.gftoc-mobile-link {
	position: relative;
	display: grid;
	width: 100%;
	grid-template-columns: 2.15rem minmax(0, 1fr) auto;
	align-items: baseline;
	gap: .68rem;
	margin: 0;
	padding: .8rem .35rem .8rem calc(.35rem + (var(--gftoc-depth, 0) * .8rem));
	border-bottom: 1px solid rgba(17, 24, 39, .1);
	border-radius: .42rem;
	background: transparent;
	color: inherit;
	text-align: left;
	transition: background-color 160ms ease, color 160ms ease;
}

.gftoc-mobile-link.is-active {
	background: rgba(37, 99, 235, .08);
	background: color-mix(in srgb, var(--gftoc-accent-color) 10%, transparent);
	color: var(--gftoc-accent-color);
}

.gftoc-mobile-index {
	font-size: .63rem;
	font-variant-numeric: tabular-nums;
	font-weight: 650;
	letter-spacing: .06em;
	opacity: .48;
}

.gftoc-mobile-title {
	min-width: 0;
	font-family: Georgia, "Noto Serif TC", "Times New Roman", serif;
	font-size: 1.08rem;
	font-weight: 500;
	line-height: 1.2;
}

.gftoc-mobile-arrow {
	font-size: .78rem;
	opacity: 0;
	transform: translate(-.22rem, .22rem);
	transition: opacity 160ms ease, transform 220ms var(--gftoc-ease-out);
}

.gftoc-mobile-link.is-active .gftoc-mobile-arrow {
	opacity: .65;
	transform: translate(0, 0);
}

body.gftoc-scroll-locked {
	overflow: hidden !important;
}

@media (max-width: 480px) {
	.gftoc-mobile-trigger-label {
		display: none;
	}

	.gftoc-mobile-panel {
		max-height: 86dvh;
	}
}

@media (prefers-reduced-motion: reduce) {
	.gftoc-root *,
	.gftoc-root *::before,
	.gftoc-root *::after {
		scroll-behavior: auto !important;
		transition-duration: .01ms !important;
		animation-duration: .01ms !important;
		animation-iteration-count: 1 !important;
	}
}

@media print {
	.gftoc-root {
		display: none !important;
	}
}