.sabpf-flipbook {
	--sabpf-bg-color: #808080;
	--sabpf-height: 600px;
	--sabpf-width: 900px;
	position: relative;
	width: 100%;
	max-width: var(--sabpf-width);
	margin: 0 auto;
	background: var(--sabpf-bg-color);
	border-radius: 4px;
	overflow: hidden;
	box-sizing: border-box;
	display: flex;
	flex-direction: column;
}

.sabpf-flipbook *,
.sabpf-flipbook *::before,
.sabpf-flipbook *::after {
	box-sizing: border-box;
}

.sabpf-flipbook--empty {
	padding: 24px;
	text-align: center;
	color: #fff;
	background: #444;
	font-size: 14px;
}

.sabpf-flipbook__loading {
	padding: 60px 20px;
	text-align: center;
	color: #eee;
	font-size: 14px;
}

.sabpf-flipbook__skeleton {
	position: absolute;
	inset: 0;
	display: flex;
	gap: 2px;
	z-index: 1;
	transition: opacity 0.25s ease;
}

.sabpf-flipbook__skeleton--hidden {
	opacity: 0;
	pointer-events: none;
}

.sabpf-flipbook__skeleton-page {
	flex: 1;
	background: linear-gradient(90deg, #3a3a3a 25%, #454545 37%, #3a3a3a 63%);
	background-size: 400% 100%;
	animation: sabpf-skeleton-pulse 1.4s ease infinite;
}

@keyframes sabpf-skeleton-pulse {
	0% {
		background-position: 100% 50%;
	}
	100% {
		background-position: 0 50%;
	}
}

.sabpf-flipbook__viewport {
	position: relative;
	width: 100%;
	height: var(--sabpf-height);
	perspective: 2400px;
	display: flex;
	align-items: center;
	justify-content: center;
	overflow: hidden;
	flex: 1 1 auto;
}

.sabpf-flipbook__spread {
	position: relative;
	display: flex;
	height: 100%;
	width: 100%;
	max-width: 100%;
	transform-style: preserve-3d;
}

.sabpf-flipbook__page,
.sabpf-flipbook__slot-page {
	position: relative;
	height: 100%;
	background: #fff;
}

.sabpf-flipbook__page img,
.sabpf-flipbook__page canvas,
.sabpf-flipbook__slot-page img,
.sabpf-flipbook__slot-page canvas,
.sabpf-flipbook__leaf-face img,
.sabpf-flipbook__leaf-face canvas {
	display: block;
	width: 100%;
	height: 100%;
	object-fit: contain;
}

/* ---------------------------------------------------------------------
   Book-flip mode 
   --------------------------------------------------------------------- */

.sabpf-flipbook--book-flip .sabpf-flipbook__page--left,
.sabpf-flipbook--book-flip .sabpf-flipbook__page--under {
	flex: 0 1 50%;
	width: 50%;
}

.sabpf-flipbook--book-flip .sabpf-flipbook__page--under {
	position: absolute;
	inset: 0 0 0 50%;
	z-index: 1;
}

.sabpf-flipbook--book-flip.sabpf-flipbook--single-page .sabpf-flipbook__page--left {
	display: none;
}

.sabpf-flipbook--book-flip.sabpf-flipbook--single-page .sabpf-flipbook__page--under {
	inset: 0;
	z-index: 1;
	width: 100%;
	flex: 0 1 100%;
}

.sabpf-flipbook__leaf {
	position: absolute;
	inset: 0 0 0 50%;
	transform-style: preserve-3d;
	transform-origin: left center;
	z-index: 2;
}

.sabpf-flipbook--single-page .sabpf-flipbook__leaf {
	inset: 0;
}

.sabpf-flipbook__leaf--turning {
	transition: transform 0.65s cubic-bezier(0.45, 0.05, 0.55, 0.95);
}

.sabpf-flipbook__leaf-face {
	position: absolute;
	inset: 0;
	backface-visibility: hidden;
	background: #fff;
	box-shadow: 0 0 12px rgba(0, 0, 0, 0.3);
}

.sabpf-flipbook__leaf-face--back {
	transform: rotateY(180deg);
}

/* ---------------------------------------------------------------------
   Page-slide mode 
   --------------------------------------------------------------------- */

.sabpf-flipbook--page-slide {
	max-width: var(--sabpf-width, 100%);
}

.sabpf-flipbook--page-slide .sabpf-flipbook__spread {
	overflow: hidden;
}

.sabpf-flipbook__strip {
	position: relative;
	width: 100%;
	height: 100%;
}

.sabpf-flipbook__slot {
	position: absolute;
	top: 0;
	left: 0;
	width: 100%;
	height: 100%;
	display: flex;
}

.sabpf-flipbook__slot-page {
	flex: 1 1 0;
	min-width: 0;
}

.sabpf-flipbook__slot--incoming {
	opacity: 0;
}

.sabpf-flipbook__slot--incoming.sabpf-flipbook__slot--visible {
	opacity: 1;
}

.sabpf-flipbook__strip--left .sabpf-flipbook__slot--incoming {
	transform: translateX(100%);
}

.sabpf-flipbook__strip--left.sabpf-flipbook__strip--reverse .sabpf-flipbook__slot--incoming {
	transform: translateX(-100%);
}

.sabpf-flipbook__strip--left.sabpf-flipbook__strip--sliding .sabpf-flipbook__slot--current {
	transform: translateX(-100%);
}

.sabpf-flipbook__strip--left.sabpf-flipbook__strip--sliding.sabpf-flipbook__strip--reverse .sabpf-flipbook__slot--current {
	transform: translateX(100%);
}

.sabpf-flipbook__strip--left.sabpf-flipbook__strip--sliding .sabpf-flipbook__slot--incoming {
	transform: translateX(0);
}

.sabpf-flipbook__strip--left .sabpf-flipbook__slot {
	transition: none;
}

.sabpf-flipbook__strip--left.sabpf-flipbook__strip--sliding .sabpf-flipbook__slot {
	transition: transform 0.45s ease;
}

/* Direction: top — incoming pre-positioned one height below. */
.sabpf-flipbook__strip--top .sabpf-flipbook__slot--incoming {
	transform: translateY(100%);
}

.sabpf-flipbook__strip--top.sabpf-flipbook__strip--reverse .sabpf-flipbook__slot--incoming {
	transform: translateY(-100%);
}

.sabpf-flipbook__strip--top.sabpf-flipbook__strip--sliding .sabpf-flipbook__slot--current {
	transform: translateY(-100%);
}

.sabpf-flipbook__strip--top.sabpf-flipbook__strip--sliding.sabpf-flipbook__strip--reverse .sabpf-flipbook__slot--current {
	transform: translateY(100%);
}

.sabpf-flipbook__strip--top.sabpf-flipbook__strip--sliding .sabpf-flipbook__slot--incoming {
	transform: translateY(0);
}

.sabpf-flipbook__strip--top.sabpf-flipbook__strip--sliding .sabpf-flipbook__slot {
	transition: transform 0.45s ease;
}

/* Direction: fade — incoming pre-rendered in place, just invisible until it
   crossfades in as current fades out. */
.sabpf-flipbook__strip--fade.sabpf-flipbook__strip--sliding .sabpf-flipbook__slot--current {
	transition: opacity 0.45s ease;
	opacity: 0;
}

.sabpf-flipbook__strip--fade.sabpf-flipbook__strip--sliding .sabpf-flipbook__slot--incoming {
	transition: opacity 0.45s ease;
}

/* ---------------------------------------------------------------------
   Toolbar
   --------------------------------------------------------------------- */

.sabpf-flipbook__toolbar {
	display: flex;
	align-items: center;
	justify-content: center;
	gap: 8px;
	padding: 8px;
	background: rgba(0, 0, 0, 0.35);
	flex: 0 0 auto;
	position: relative;
	z-index: 5;
}

.sabpf-flipbook__btn {
	background: rgba(255, 255, 255, 0.1);
	border: none;
	color: #fff;
	width: 32px;
	height: 32px;
	border-radius: 3px;
	cursor: pointer;
	display: inline-flex;
	align-items: center;
	justify-content: center;
	font-size: 14px;
	line-height: 1;
}

.sabpf-flipbook__btn:hover {
	background: rgba(255, 255, 255, 0.25);
}

.sabpf-flipbook__btn:disabled {
	opacity: 0.4;
	cursor: not-allowed;
}

.sabpf-flipbook__page-indicator {
	color: #fff;
	font-size: 13px;
	min-width: 70px;
	text-align: center;
}

.sabpf-flipbook--lightbox-trigger {
	cursor: pointer;
}

.sabpf-flipbook__lightbox-overlay {
	position: fixed;
	inset: 0;
	background: rgba(0, 0, 0, 0.85);
	z-index: 100000;
	display: flex;
	align-items: center;
	justify-content: center;
	padding: 24px;
}

.sabpf-flipbook__lightbox-overlay .sabpf-flipbook {
	max-height: 90vh;
}

.sabpf-flipbook__lightbox-close {
	position: absolute;
	top: 16px;
	right: 16px;
	background: rgba(255, 255, 255, 0.15);
	border: none;
	color: #fff;
	width: 36px;
	height: 36px;
	border-radius: 50%;
	cursor: pointer;
	font-size: 18px;
}

/* ---------------------------------------------------------------------
   Fullscreen 
   --------------------------------------------------------------------- */

.sabpf-flipbook--fullscreen {
	width: 100vw;
	height: 100vh;
	max-width: none;
	max-height: none;
	background: #000;
}

.sabpf-flipbook--fullscreen .sabpf-flipbook__viewport {
	height: auto;
	flex: 1 1 auto;
}

.sabpf-flipbook--fullscreen .sabpf-flipbook__toolbar {
	background: rgba(0, 0, 0, 0.6);
	padding: 12px;
}

.sabpf-flipbook--fullscreen .sabpf-flipbook__btn {
	width: 40px;
	height: 40px;
	font-size: 18px;
}

@media (max-width: 600px) {
	.sabpf-flipbook__viewport {
		height: min(var(--sabpf-height), 70vh);
	}
	.sabpf-flipbook--book-flip.not-single .sabpf-flipbook__page--left {
		display: none;
	}
}