.fbs-flipbook {
	--fbs-viewer-width: 100%;
	--fbs-viewer-height: 700px;
	--fbs-bg: #101418;
	--fbs-speed: 400ms;
	width: min(100%, var(--fbs-viewer-width));
	margin: 0 auto;
}

.fbs-stage-wrap {
	position: relative;
	min-height: var(--fbs-viewer-height);
	border-radius: 18px;
	overflow: hidden;
	background:
		radial-gradient(circle at top center, rgba(255, 255, 255, 0.08), transparent 40%),
		linear-gradient(180deg, rgba(255, 255, 255, 0.04), rgba(255, 255, 255, 0)),
		var(--fbs-bg);
	box-shadow: 0 18px 60px rgba(0, 0, 0, 0.18);
}

.fbs-stage-wrap::before {
	content: "";
	position: absolute;
	inset: 0;
	background: linear-gradient(90deg, rgba(0, 0, 0, 0.16), transparent 20%, transparent 80%, rgba(0, 0, 0, 0.16));
	opacity: 0.45;
	pointer-events: none;
	z-index: 0;
}

.fbs-flipbook-notice {
	padding: 16px 18px;
	border-radius: 12px;
	background: #f6f7f7;
	color: #1d2327;
}

.fbs-loading,
.fbs-error,
.fbs-noscript {
	display: flex;
	align-items: center;
	justify-content: center;
	min-height: var(--fbs-viewer-height);
	padding: 24px;
	text-align: center;
	color: #fff;
}

.fbs-error {
	color: #ffd5d5;
}

.fbs-fallback-link {
	margin-top: 10px;
	text-align: center;
}

.fbs-fallback-link a,
.fbs-fallback-link span {
	font-size: 14px;
	color: #50575e;
}

.fbs-stage {
	display: grid;
	grid-template-columns: repeat(2, minmax(0, 1fr));
	gap: 16px;
	align-items: center;
	height: var(--fbs-viewer-height);
	perspective: 1800px;
	padding: 24px;
	position: relative;
	z-index: 1;
}

.fbs-stage.has-spread::before {
	content: "";
	position: absolute;
	top: 24px;
	bottom: 24px;
	left: 50%;
	width: 18px;
	transform: translateX(-50%);
	background: linear-gradient(90deg, rgba(0, 0, 0, 0.15), rgba(255, 255, 255, 0.05), rgba(0, 0, 0, 0.18));
	border-radius: 999px;
	filter: blur(8px);
	opacity: 0.75;
	pointer-events: none;
}

.fbs-page {
	display: flex;
	align-items: center;
	justify-content: center;
	padding: 10px;
	position: relative;
	transform-origin: left center;
	transition:
		transform var(--fbs-speed) ease,
		opacity var(--fbs-speed) ease,
		filter var(--fbs-speed) ease;
	will-change: transform, opacity;
	min-height: calc(var(--fbs-viewer-height) - 48px);
	transform-style: preserve-3d;
	perspective: 1600px;
	filter: drop-shadow(0 12px 24px rgba(0, 0, 0, 0.16));
}

.fbs-page canvas {
	display: block;
	width: auto;
	height: auto;
	max-width: 100%;
	max-height: 100%;
	background: #fff;
	border-radius: 10px;
	box-shadow:
		0 18px 45px rgba(0, 0, 0, 0.24),
		0 2px 8px rgba(0, 0, 0, 0.08);
}

.fbs-page::before,
.fbs-page::after {
	content: "";
	position: absolute;
	top: 10px;
	bottom: 10px;
	width: 22%;
	max-width: 120px;
	border-radius: 12px;
	opacity: 0;
	pointer-events: none;
	transition:
		opacity var(--fbs-speed) ease,
		transform var(--fbs-speed) ease,
		filter var(--fbs-speed) ease;
}

.fbs-page::before {
	right: 10px;
	background: linear-gradient(90deg, rgba(255, 255, 255, 0.02), rgba(255, 255, 255, 0.32) 38%, rgba(255, 255, 255, 0.75) 70%, rgba(255, 255, 255, 0.18));
	transform: translateX(16px) skewY(0deg);
	transform-origin: right center;
}

.fbs-page::after {
	left: 10px;
	background: linear-gradient(90deg, rgba(0, 0, 0, 0.24), rgba(0, 0, 0, 0.08), rgba(0, 0, 0, 0));
	transform: translateX(-12px);
	transform-origin: left center;
}

.fbs-page-secondary {
	opacity: 0;
	transform: rotateY(-10deg) scale(0.98);
}

.fbs-stage.has-spread .fbs-page-secondary {
	opacity: 1;
	transform: none;
}

.fbs-stage.is-flipping-next .fbs-page-primary,
.fbs-stage.is-flipping-prev .fbs-page-primary {
	opacity: 0.88;
	filter: drop-shadow(0 22px 30px rgba(0, 0, 0, 0.24));
}

.fbs-stage.is-flipping-next .fbs-page-secondary,
.fbs-stage.is-flipping-prev .fbs-page-secondary {
	opacity: 1;
	transform: rotateY(0deg) scale(1);
	filter: drop-shadow(0 16px 24px rgba(0, 0, 0, 0.14));
}

.fbs-stage.is-flipping-next .fbs-page-primary {
	transform: perspective(1800px) rotateY(-34deg) skewY(-2deg) scale(0.985);
	transform-origin: right center;
}

.fbs-stage.is-flipping-next .fbs-page-primary::before {
	opacity: 1;
	transform: translateX(6px) skewY(-8deg) rotateY(-18deg);
	filter: drop-shadow(-10px 0 14px rgba(0, 0, 0, 0.12));
}

.fbs-stage.is-flipping-next .fbs-page-primary::after {
	opacity: 1;
	transform: translateX(-2px);
}

.fbs-stage.is-flipping-next .fbs-page-secondary {
	transform: perspective(1600px) rotateY(0deg) translateX(0) scale(1);
}

.fbs-stage.is-flipping-prev .fbs-page-primary {
	transform: perspective(1800px) rotateY(34deg) skewY(2deg) scale(0.985);
	transform-origin: left center;
}

.fbs-stage.is-flipping-prev .fbs-page-primary::before {
	left: 10px;
	right: auto;
	background: linear-gradient(270deg, rgba(255, 255, 255, 0.02), rgba(255, 255, 255, 0.32) 38%, rgba(255, 255, 255, 0.75) 70%, rgba(255, 255, 255, 0.18));
	opacity: 1;
	transform: translateX(-6px) skewY(8deg) rotateY(18deg);
	filter: drop-shadow(10px 0 14px rgba(0, 0, 0, 0.12));
}

.fbs-stage.is-flipping-prev .fbs-page-primary::after {
	left: auto;
	right: 10px;
	background: linear-gradient(270deg, rgba(0, 0, 0, 0.24), rgba(0, 0, 0, 0.08), rgba(0, 0, 0, 0));
	opacity: 1;
	transform: translateX(2px);
}

.fbs-stage.is-flipping-prev .fbs-page-secondary {
	transform: perspective(1600px) rotateY(0deg) translateX(0) scale(1);
}

.fbs-toolbar {
	display: flex;
	flex-wrap: wrap;
	align-items: center;
	justify-content: space-between;
	gap: 12px;
	margin-top: 12px;
	padding: 12px 14px;
	border-radius: 14px;
	background: #1d2327;
	color: #fff;
	position: sticky;
	bottom: 12px;
	z-index: 3;
}

.fbs-toolbar-group {
	display: flex;
	flex-wrap: wrap;
	align-items: center;
	gap: 8px;
}

.fbs-button {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	min-height: 40px;
	padding: 10px 14px;
	border: 1px solid rgba(255, 255, 255, 0.14);
	border-radius: 999px;
	background: rgba(255, 255, 255, 0.08);
	color: #fff;
	text-decoration: none;
	cursor: pointer;
	transition: background-color 0.2s ease, border-color 0.2s ease;
}

.fbs-button:hover,
.fbs-button:focus {
	background: rgba(255, 255, 255, 0.14);
	border-color: rgba(255, 255, 255, 0.24);
	color: #fff;
}

.fbs-page-indicator {
	font-size: 14px;
	font-weight: 600;
	white-space: nowrap;
}

.hidden {
	display: none !important;
}

@media (max-width: 767px) {
	.fbs-flipbook {
		width: 100%;
	}

	.fbs-stage-wrap,
	.fbs-stage,
	.fbs-loading,
	.fbs-error,
	.fbs-noscript {
		min-height: min(70vh, var(--fbs-viewer-height));
		height: min(70vh, var(--fbs-viewer-height));
	}

	.fbs-stage {
		grid-template-columns: minmax(0, 1fr);
		padding: 14px;
	}

	.fbs-page {
		min-height: calc(min(70vh, var(--fbs-viewer-height)) - 28px);
		padding: 6px;
	}

	.fbs-page::before,
	.fbs-page::after {
		top: 6px;
		bottom: 6px;
	}

	.fbs-stage.is-flipping-next .fbs-page-primary,
	.fbs-stage.is-flipping-prev .fbs-page-primary {
		transform: perspective(1600px) rotateY(-18deg) scale(0.99);
	}

	.fbs-stage.is-flipping-next .fbs-page-primary::before,
	.fbs-stage.is-flipping-prev .fbs-page-primary::before {
		opacity: 0.85;
	}

	.fbs-page-secondary {
		display: none;
	}

	.fbs-toolbar {
		justify-content: center;
		bottom: 8px;
	}

	.fbs-toolbar-group {
		justify-content: center;
		width: 100%;
	}
}