/*
 * Flipbook PDF viewer styles — CSS 3D page-turn with perspective.
 *
 * @package JezPress\PdfEmbedder
 * @since   1.0.0
 */

.jppe-flipbook-viewer {
	display: flex;
	flex-direction: column;
	align-items: center;
	background: #d4c8b0;
	background-image:
		radial-gradient( ellipse at center, #c8bb9e 0%, #b8aa88 100% );
	border-radius: 4px;
	overflow: hidden;
	font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
	position: relative;
	user-select: none;
}

/* ── 3D Stage ─────────────────────────────────────────────────── */

.jppe-flipbook-viewer .jppe-flipbook-stage {
	flex: 1;
	width: 100%;
	display: flex;
	align-items: center;
	justify-content: center;
	padding: 24px 16px 8px;
	box-sizing: border-box;
	perspective: 1800px;
	perspective-origin: 50% 50%;
}

.jppe-flipbook-viewer .jppe-flipbook-book {
	position: relative;
	display: flex;
	transform-style: preserve-3d;
	box-shadow:
		0 8px 32px rgba( 0, 0, 0, 0.35 ),
		0 2px 6px rgba( 0, 0, 0, 0.25 );
}

/* ── Page containers ──────────────────────────────────────────── */

.jppe-flipbook-viewer .jppe-page-container {
	position: relative;
	overflow: hidden;
}

.jppe-flipbook-viewer .jppe-page-container canvas {
	display: block;
	max-width: 100%;
}

/* Page shadows for depth illusion */
.jppe-flipbook-viewer .jppe-page-shadow {
	position: absolute;
	top: 0;
	bottom: 0;
	width: 40px;
	pointer-events: none;
}

.jppe-flipbook-viewer .jppe-shadow-left {
	right: 0;
	background: linear-gradient( to left, rgba( 0, 0, 0, 0.12 ), transparent );
}

.jppe-flipbook-viewer .jppe-shadow-right {
	left: 0;
	background: linear-gradient( to right, rgba( 0, 0, 0, 0.12 ), transparent );
}

/* Book spine — the fold line between the two pages */
.jppe-flipbook-viewer .jppe-flipbook-book::after {
	content: '';
	position: absolute;
	top: 0;
	bottom: 0;
	left: 50%;
	width: 2px;
	background: linear-gradient(
		to bottom,
		rgba( 0, 0, 0, 0.1 ),
		rgba( 0, 0, 0, 0.3 ) 40%,
		rgba( 0, 0, 0, 0.3 ) 60%,
		rgba( 0, 0, 0, 0.1 )
	);
	box-shadow: -2px 0 6px rgba( 0, 0, 0, 0.1 ), 2px 0 6px rgba( 0, 0, 0, 0.1 );
	pointer-events: none;
	z-index: 10;
}

/* ── Turning page overlay ─────────────────────────────────────── */

.jppe-flipbook-viewer .jppe-turning-page {
	position: absolute;
	top: 0;
	bottom: 0;
	width: 50%;
	transform-origin: left center;
	transform-style: preserve-3d;
	display: none; /* shown by JS during animation */
	z-index: 20;
}

.jppe-flipbook-viewer .jppe-turning-page-front,
.jppe-flipbook-viewer .jppe-turning-page-back {
	position: absolute;
	inset: 0;
	backface-visibility: hidden;
	overflow: hidden;
}

.jppe-flipbook-viewer .jppe-turning-page-back {
	transform: rotateY( 180deg );
}

/* Flip from right → fold left (next page) */
.jppe-flipbook-viewer .jppe-turning-page.jppe-flip-from-right {
	right: 0;
	left: auto;
	transform-origin: left center;
}

.jppe-flipbook-viewer .jppe-turning-page.jppe-flip-from-right.jppe-is-turning {
	animation: jppe-flip-right 0.6s ease-in-out forwards;
}

/* Flip from left → fold right (prev page) */
.jppe-flipbook-viewer .jppe-turning-page.jppe-flip-from-left {
	left: 0;
	transform-origin: right center;
}

.jppe-flipbook-viewer .jppe-turning-page.jppe-flip-from-left.jppe-is-turning {
	animation: jppe-flip-left 0.6s ease-in-out forwards;
}

@keyframes jppe-flip-right {
	0%   { transform: rotateY( 0deg ); }
	100% { transform: rotateY( -180deg ); }
}

@keyframes jppe-flip-left {
	0%   { transform: rotateY( 0deg ); }
	100% { transform: rotateY( 180deg ); }
}

/* ── Controls bar ─────────────────────────────────────────────── */

.jppe-flipbook-viewer .jppe-flipbook-controls {
	flex-shrink: 0;
	align-self: center;
	display: inline-flex;
	align-items: center;
	justify-content: center;
	gap: 10px;
	padding: 8px 14px;
	margin: 6px auto 14px;
	background: rgba( 255, 255, 255, 0.92 );
	border-radius: 999px;
	box-shadow: 0 4px 16px rgba( 0, 0, 0, 0.16 );
	box-sizing: border-box;
}

/* Base button — subtle white "ghost" pill. */
.jppe-flipbook-viewer .jppe-btn {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	width: 38px;
	height: 38px;
	padding: 0;
	background: #fff;
	border: 1px solid rgba( 0, 0, 0, 0.1 );
	border-radius: 50%;
	color: #374151;
	cursor: pointer;
	transition: background 0.15s, color 0.15s, border-color 0.15s, box-shadow 0.15s, transform 0.1s, filter 0.15s;
	text-decoration: none;
}

.jppe-flipbook-viewer .jppe-btn:hover {
	background: var( --jppe-accent, #2563eb );
	border-color: var( --jppe-accent, #2563eb );
	color: #fff;
	box-shadow: 0 3px 10px rgba( 0, 0, 0, 0.18 );
}

.jppe-flipbook-viewer .jppe-btn:active {
	transform: translateY( 1px );
}

.jppe-flipbook-viewer .jppe-btn:focus-visible {
	outline: 2px solid var( --jppe-accent, #2563eb );
	outline-offset: 2px;
}

.jppe-flipbook-viewer .jppe-btn:disabled {
	opacity: 0.4;
	cursor: not-allowed;
	box-shadow: none;
}

.jppe-flipbook-viewer .jppe-btn:disabled:hover {
	background: #fff;
	color: #374151;
	border-color: rgba( 0, 0, 0, 0.1 );
}

/* Primary navigation — accent-filled, larger. */
.jppe-flipbook-viewer .jppe-flip-prev,
.jppe-flipbook-viewer .jppe-flip-next {
	width: 44px;
	height: 44px;
	background: var( --jppe-accent, #2563eb );
	border-color: var( --jppe-accent, #2563eb );
	color: #fff;
}

.jppe-flipbook-viewer .jppe-flip-prev:hover:not( :disabled ),
.jppe-flipbook-viewer .jppe-flip-next:hover:not( :disabled ) {
	filter: brightness( 0.92 );
	box-shadow: 0 3px 10px rgba( 0, 0, 0, 0.22 );
}

.jppe-flipbook-viewer .jppe-flipbook-page-info {
	font-size: 13px;
	font-weight: 600;
	color: #374151;
	display: flex;
	align-items: center;
	gap: 4px;
	padding: 0 4px;
}

.jppe-flipbook-viewer .jppe-controls-sep {
	width: 1px;
	height: 22px;
	background: rgba( 0, 0, 0, 0.15 );
	margin: 0 2px;
}

/* Loading / error overlays */
.jppe-flipbook-viewer .jppe-flipbook-loading,
.jppe-flipbook-viewer .jppe-flipbook-error {
	position: absolute;
	inset: 0;
	display: flex;
	align-items: center;
	justify-content: center;
	background: inherit;
	color: #666;
	font-size: 14px;
	z-index: 30;
}

.jppe-flipbook-viewer .jppe-flipbook-error {
	color: #c0392b;
}

/* The display:flex above otherwise overrides the [hidden] attribute the JS
   toggles, so the error must be explicitly hidden when not active. */
.jppe-flipbook-viewer .jppe-flipbook-loading[hidden],
.jppe-flipbook-viewer .jppe-flipbook-error[hidden] {
	display: none;
}

/* ── Mobile: single-page layout ──────────────────────────────── */

@media ( max-width: 639px ) {
	.jppe-flipbook-viewer .jppe-page-left,
	.jppe-flipbook-viewer .jppe-page-right {
		width: 100% !important;
	}

	.jppe-flipbook-viewer .jppe-flipbook-book::after {
		display: none; /* No spine in single-page mode */
	}

	/* Hide right page in mobile mode via JS (canvas cleared) */
}

/* Responsive: keep the two-page spread within the container width (the
   flipbook uses a fixed-height 3D stage, so width-fit is the main concern). */
.jppe-flipbook-viewer[data-responsive="1"] {
	max-width: 100%;
}

.jppe-flipbook-viewer[data-responsive="1"] .jppe-page-canvas {
	max-width: 100%;
	height: auto;
}

/* Fullscreen */
.jppe-flipbook-viewer:fullscreen {
	border-radius: 0;
}