.kpb-reader {
	max-width: 1220px;
	margin: 0 auto 24px;
	padding: 0 20px;
}

.kpb-reader__inner {
	background: #fff;
	border: 1px solid #e9e9e9;
	border-radius: 18px;
	padding: 16px;
	box-shadow: 0 8px 24px rgba(0, 0, 0, 0.05);
}

.kpb-reader__preview {
	display: flex;
	flex-direction: column;
	align-items: center;
	justify-content: center;
	gap: 18px;
	padding: 32px 16px;
	text-align: center;
}

.kpb-reader__cover img,
.kpb-reader__cover-placeholder {
	max-width: min(100%, 320px);
	max-height: 480px;
	border-radius: 14px;
	box-shadow: 0 14px 30px rgba(0, 0, 0, 0.10);
	display: block;
}

.kpb-reader__cover-placeholder {
	min-height: 420px;
	background: #fafafa;
	border: 1px dashed #d7d7d7;
	display: flex;
	align-items: center;
	justify-content: center;
	padding: 20px;
	color: #777;
}

.kpb-reader__title {
	margin: 0;
	font-size: 30px;
	line-height: 1.3;
	color: #28323d;
	font-weight: 700;
}

.kpb-reader__authors {
	color: #6b7280;
	font-size: 18px;
}

.kpb-reader__actions,
.kpb-reader__toolbar,
.kpb-reader__toolbar-group {
	display: flex;
	flex-wrap: wrap;
	gap: 10px;
	align-items: center;
	justify-content: center;
}

.kpb-reader__actions {
	margin-top: 4px;
}

.kpb-reader__btn {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	min-height: 46px;
	padding: 10px 18px;
	border-radius: 999px;
	border: 1px solid #d8d8d8;
	background: #fff;
	color: #333;
	font-size: 15px;
	font-weight: 700;
	cursor: pointer;
	text-decoration: none;
	transition: all 0.2s ease;
}

.kpb-reader__btn:hover,
.kpb-reader__btn:focus {
	background: #f6f6f6;
	color: #111;
	outline: none;
}

.kpb-reader__btn--primary {
	background: #0b7a75;
	border-color: #0b7a75;
	color: #fff;
}

.kpb-reader__btn--primary:hover,
.kpb-reader__btn--primary:focus {
	background: #095f5c;
	border-color: #095f5c;
	color: #fff;
}

.kpb-reader__btn[disabled] {
	opacity: 0.7;
	cursor: wait;
}

.kpb-reader__loader,
.kpb-reader__error {
	text-align: center;
	padding: 42px 16px;
}

.kpb-reader__loader[hidden],
.kpb-reader__error[hidden],
.kpb-reader__shell[hidden] {
	display: none !important;
}

.kpb-reader__spinner {
	width: 48px;
	height: 48px;
	border-radius: 50%;
	border: 4px solid #e8e8e8;
	border-top-color: #0b7a75;
	animation: kpb-reader-spin 0.9s linear infinite;
	margin: 0 auto 14px;
}

@keyframes kpb-reader-spin {
	to {
		transform: rotate(360deg);
	}
}

.kpb-reader__toolbar {
	justify-content: space-between;
	padding-bottom: 14px;
}

.kpb-reader__toolbar-group {
	justify-content: flex-start;
}

.kpb-reader__header-actions {
	display: flex;
	align-items: center;
	justify-content: space-between;
	gap: 12px;
	margin-bottom: 14px;
}

.kpb-reader__counter {
	font-weight: 700;
	color: #374151;
}

.kpb-reader__zoom {
	display: flex;
	gap: 8px;
	align-items: center;
}

.kpb-reader__stage {
	border: 1px solid #ececec;
	border-radius: 16px;
	background:
		linear-gradient(90deg, rgba(0,0,0,0.025) 49.3%, rgba(0,0,0,0.09) 50%, rgba(0,0,0,0.025) 50.7%),
		linear-gradient(180deg, #f7f4ee 0%, #fffdf8 100%);
	padding: 18px;
	overflow: hidden;
	position: relative;
	min-height: 720px;
	perspective: 2200px;
	transform-style: preserve-3d;
}

.kpb-reader__book {
	display: grid;
	grid-template-columns: 1fr 1fr;
	gap: 20px;
	align-items: stretch;
	position: relative;
}

.kpb-reader__page {
	background: #fff;
	border-radius: 10px;
	box-shadow:
		inset 0 0 0 1px #efefef,
		0 10px 25px rgba(0,0,0,0.08);
	padding: 10px;
	min-height: 640px;
	display: flex;
	align-items: center;
	justify-content: center;
	position: relative;
	overflow: hidden;
	transform-style: preserve-3d;
	backface-visibility: hidden;
	will-change: transform, opacity, box-shadow, filter;
}

.kpb-reader__page::before {
	content: "";
	position: absolute;
	inset: 0;
	pointer-events: none;
	opacity: 0;
	transition: opacity 0.45s ease;
	background: linear-gradient(
		to left,
		rgba(0,0,0,0.18) 0%,
		rgba(0,0,0,0.08) 20%,
		rgba(255,255,255,0.02) 55%,
		rgba(255,255,255,0) 100%
	);
}

.kpb-reader__page::after {
	content: "";
	position: absolute;
	inset: 0;
	pointer-events: none;
	opacity: 0;
	transition: opacity 0.45s ease;
	background: linear-gradient(
		to right,
		rgba(0,0,0,0.18) 0%,
		rgba(0,0,0,0.08) 20%,
		rgba(255,255,255,0.02) 55%,
		rgba(255,255,255,0) 100%
	);
}

.kpb-reader__page--left {
	transform-origin: left center;
}

.kpb-reader__page--right {
	transform-origin: right center;
}

.kpb-reader__page.is-flipping-next {
	animation: kpb-flip-next 0.6s cubic-bezier(0.22, 0.7, 0.2, 1);
	z-index: 4;
	box-shadow:
		0 18px 35px rgba(0,0,0,0.18),
		inset 0 0 0 1px #e8e8e8;
}

.kpb-reader__page.is-flipping-next::before {
	opacity: 1;
}

.kpb-reader__page.is-flipping-prev {
	animation: kpb-flip-prev 0.6s cubic-bezier(0.22, 0.7, 0.2, 1);
	z-index: 4;
	box-shadow:
		0 18px 35px rgba(0,0,0,0.18),
		inset 0 0 0 1px #e8e8e8;
}

.kpb-reader__page.is-flipping-prev::after {
	opacity: 1;
}

@keyframes kpb-flip-next {
	0% {
		transform: rotateY(0deg) translateX(0);
		filter: brightness(1);
	}
	35% {
		transform: rotateY(-18deg) translateX(-6px);
		filter: brightness(0.98);
	}
	70% {
		transform: rotateY(-48deg) translateX(-16px);
		filter: brightness(0.92);
	}
	100% {
		transform: rotateY(-78deg) translateX(-26px);
		filter: brightness(0.88);
	}
}

@keyframes kpb-flip-prev {
	0% {
		transform: rotateY(0deg) translateX(0);
		filter: brightness(1);
	}
	35% {
		transform: rotateY(18deg) translateX(6px);
		filter: brightness(0.98);
	}
	70% {
		transform: rotateY(48deg) translateX(16px);
		filter: brightness(0.92);
	}
	100% {
		transform: rotateY(78deg) translateX(26px);
		filter: brightness(0.88);
	}
}

.kpb-reader__canvas {
	display: block;
	max-width: 100%;
	height: auto;
	box-shadow: 0 1px 2px rgba(0,0,0,0.04);
	user-select: none;
	-webkit-user-drag: none;
}

.kpb-reader__page-number {
	position: absolute;
	bottom: 8px;
	inset-inline-end: 10px;
	font-size: 12px;
	color: #777;
	background: rgba(255,255,255,0.92);
	padding: 4px 8px;
	border-radius: 999px;
	border: 1px solid #ececec;
	z-index: 3;
}

.kpb-reader__single-note {
	text-align: center;
	color: #777;
	font-size: 14px;
	padding-top: 10px;
}

.kpb-reader__stage.is-single .kpb-reader__book {
	grid-template-columns: 1fr;
}

.kpb-reader__stage.is-single .kpb-reader__page--right {
	display: none;
}

.kpb-reader__stage.is-fullscreen {
	position: fixed;
	inset: 0;
	z-index: 999999;
	border-radius: 0;
	padding: 16px;
	background:
		linear-gradient(90deg, rgba(0,0,0,0.025) 49.3%, rgba(0,0,0,0.09) 50%, rgba(0,0,0,0.025) 50.7%),
		linear-gradient(180deg, #f7f4ee 0%, #fffdf8 100%);
}

.kpb-reader__stage.is-fullscreen .kpb-reader__page {
	min-height: calc(100vh - 190px);
}

.kpb-reader__stage.is-fullscreen .kpb-reader__book {
	height: calc(100vh - 220px);
	align-items: center;
}

.kpb-reader__shell.is-fullscreen-shell {
	background: #f7f4ee;
	padding: 16px;
	height: 100vh;
	overflow: auto;
}

.kpb-reader__shell.is-fullscreen-shell .kpb-reader__toolbar,
.kpb-reader__shell.is-fullscreen-shell .kpb-reader__header-actions {
	position: sticky;
	top: 0;
	z-index: 20;
	background: rgba(247, 244, 238, 0.96);
	padding: 10px 0;
	backdrop-filter: blur(6px);
}

/* hide mobile nav everywhere by default */
.kpb-reader__mobile-nav {
	display: none !important;
}

.kpb-reader__mobile-nav-btn {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	min-width: 120px;
	min-height: 46px;
	padding: 10px 18px;
	border-radius: 999px;
	border: 1px solid #d8d8d8;
	background: rgba(255, 255, 255, 0.96);
	color: #222;
	font-size: 15px;
	font-weight: 700;
	cursor: pointer;
	box-shadow: 0 8px 20px rgba(0,0,0,0.10);
	backdrop-filter: blur(6px);
}

.kpb-reader__mobile-nav-btn:disabled {
	opacity: 0.45;
	cursor: not-allowed;
}

@media (max-width: 767px) {
	.kpb-reader {
		padding: 0 12px;
	}

	.kpb-reader__inner {
		padding: 12px;
		border-radius: 14px;
	}

	.kpb-reader__title {
		font-size: 24px;
	}

	.kpb-reader__toolbar,
	.kpb-reader__header-actions {
		flex-direction: column;
		align-items: stretch;
	}

	.kpb-reader__toolbar-group,
	.kpb-reader__zoom {
		justify-content: center;
	}

	.kpb-reader__stage {
		padding: 12px;
		min-height: 520px;
	}

	.kpb-reader__page {
		min-height: 460px;
	}

	/* show mobile nav whenever reader is open on mobile */
	.kpb-reader__shell:not([hidden]) .kpb-reader__mobile-nav {
		display: flex !important;
		position: fixed;
		left: 0;
		right: 0;
		bottom: 14px;
		z-index: 999999;
		justify-content: center;
		gap: 12px;
		padding: 0 12px env(safe-area-inset-bottom);
		pointer-events: none;
	}

	.kpb-reader__shell:not([hidden]) .kpb-reader__mobile-nav-btn {
		pointer-events: auto;
	}

	.kpb-reader__shell:not([hidden]) .kpb-reader__mobile-nav-btn {
		flex: 0 0 auto;
		min-width: 120px;
	}
}
.kpb-reader__stage,
.kpb-reader__page,
.kpb-reader__canvas {
	touch-action: pan-y;
}

.kpb-reader__shell.is-open .kpb-reader__mobile-nav {
	display: flex !important;
}
.kpb-flipbook-modal {
	position: fixed;
	inset: 0;
	z-index: 999999;
	display: none;
	align-items: center;
	justify-content: center;
}

.kpb-flipbook-overlay {
	position: absolute;
	inset: 0;
	background: rgba(0,0,0,0.75);
}

.kpb-flipbook-container {
	position: relative;
	width: 95%;
	height: 95%;
	background: #000;
	border-radius: 12px;
	overflow: hidden;
	display: flex;
}

.kpb-flipbook-close {
	position: absolute;
	top: 10px;
	right: 10px;
	z-index: 10;
	background: rgba(0,0,0,0.7);
	color: #fff;
	border: none;
	border-radius: 50%;
	width: 40px;
	height: 40px;
	font-size: 20px;
	cursor: pointer;
}

.kpb-flipbook-container iframe,
.kpb-flipbook-container canvas {
	width: 100% !important;
	height: 100% !important;
}