/* AI FlipBook Studio Pro — Public FlipBook Renderer */

.aifbs-flipbook-wrap {
	--aifbs-bg: #0b0d12;
	--aifbs-accent: #d8b36a;
	--aifbs-page-bg: #fdfdfb;
	--aifbs-spine: #14161c;
	--aifbs-shadow-strong: rgba(0,0,0,.55);
	--aifbs-shadow-soft: rgba(0,0,0,.18);
	--aifbs-toolbar-bg: rgba(15,17,22,.9);
	--aifbs-toolbar-fg: #f3ead9;
	box-sizing: border-box;
	max-width: 100%;
	margin: 32px auto;
	font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
.aifbs-flipbook-wrap *, .aifbs-flipbook-wrap *::before, .aifbs-flipbook-wrap *::after {
	box-sizing: border-box;
}

/* ---------------- Themes ---------------- */
.aifbs-theme-luxury-black {
	--aifbs-bg: radial-gradient(ellipse at center, #1b1e27 0%, #05060a 100%);
	--aifbs-accent: #d8b36a;
	--aifbs-page-bg: #100f14;
	--aifbs-spine: #0a0b0f;
	--aifbs-toolbar-bg: rgba(10,11,15,.92);
	--aifbs-toolbar-fg: #e9d9b3;
}
.aifbs-theme-white-magazine {
	--aifbs-bg: linear-gradient(180deg,#eef0f3 0%, #d7dbe1 100%);
	--aifbs-accent: #2b6cb0;
	--aifbs-page-bg: #ffffff;
	--aifbs-spine: #c7cdd6;
	--aifbs-toolbar-bg: rgba(255,255,255,.92);
	--aifbs-toolbar-fg: #1c2733;
	--aifbs-shadow-soft: rgba(0,0,0,.10);
}
.aifbs-theme-minimal-glass {
	--aifbs-bg: linear-gradient(135deg, rgba(255,255,255,.35), rgba(255,255,255,.05));
	--aifbs-accent: #7bd7d1;
	--aifbs-page-bg: #f7fafb;
	--aifbs-spine: #dfe7e8;
	--aifbs-toolbar-bg: rgba(255,255,255,.55);
	--aifbs-toolbar-fg: #12302e;
	--aifbs-shadow-soft: rgba(0,0,0,.08);
}

.aifbs-stage {
	position: relative;
	display: flex;
	align-items: center;
	justify-content: center;
	gap: 16px;
	background: var(--aifbs-bg);
	border-radius: 14px;
	padding: 40px 20px;
	perspective: 2600px;
}

.aifbs-book {
	position: relative;
	width: 100%;
	margin: 0 auto;
	display: flex;
	transform-style: preserve-3d;
	filter: drop-shadow(0 25px 40px var(--aifbs-shadow-strong));
}

.aifbs-pages-root { display: none; }

.aifbs-spine {
	position: absolute;
	left: 50%;
	top: -10px;
	bottom: -10px;
	width: 22px;
	margin-left: -11px;
	background: linear-gradient(90deg, transparent, var(--aifbs-spine) 40%, var(--aifbs-spine) 60%, transparent);
	border-radius: 3px;
	z-index: 5;
	box-shadow: 0 0 18px rgba(0,0,0,.4);
	pointer-events: none;
}
.aifbs-flipbook-wrap[data-view-mode="single"] .aifbs-spine { display: none; }

.aifbs-leaves-viewport {
	position: relative;
	width: 100%;
	aspect-ratio: var(--aifbs-ar, 1.4);
	display: flex;
}

.aifbs-slot {
	position: relative;
	flex: 1 1 50%;
	overflow: hidden;
	background: var(--aifbs-page-bg);
}
.aifbs-flipbook-wrap[data-view-mode="single"] .aifbs-slot {
	flex: 1 1 100%;
}
.aifbs-slot-left { border-radius: 8px 0 0 8px; }
.aifbs-slot-right { border-radius: 0 8px 8px 0; }
.aifbs-flipbook-wrap[data-view-mode="single"] .aifbs-slot-left,
.aifbs-flipbook-wrap[data-view-mode="single"] .aifbs-slot-right { border-radius: 8px; }

.aifbs-slot img.aifbs-static-img {
	width: 100%;
	height: 100%;
	object-fit: cover;
	display: block;
	user-select: none;
	-webkit-user-drag: none;
}

.aifbs-slot-left::after {
	content: "";
	position: absolute;
	top: 0; right: 0; bottom: 0; width: 14%;
	background: linear-gradient(90deg, transparent, var(--aifbs-shadow-soft));
	pointer-events: none;
}
.aifbs-slot-right::before {
	content: "";
	position: absolute;
	top: 0; left: 0; bottom: 0; width: 14%;
	background: linear-gradient(270deg, transparent, var(--aifbs-shadow-soft));
	pointer-events: none;
	z-index: 2;
}

/* ---------------- The flipping leaf ---------------- */
.aifbs-leaf {
	position: absolute;
	top: 0; bottom: 0;
	width: 50%;
	transform-style: preserve-3d;
	transition: transform var(--aifbs-flip-ms, 800ms) cubic-bezier(.45,.05,.35,1);
	will-change: transform;
	cursor: grab;
	z-index: 10;
}
.aifbs-flipbook-wrap[data-view-mode="single"] .aifbs-leaf { width: 100%; }

.aifbs-leaf.aifbs-leaf-right {
	left: 50%;
	transform-origin: left center;
	transform: rotateY(0deg);
}
.aifbs-leaf.aifbs-leaf-left {
	left: 0;
	transform-origin: right center;
	transform: rotateY(0deg);
}
.aifbs-flipbook-wrap[data-view-mode="single"] .aifbs-leaf { left: 0; transform-origin: left center; }

.aifbs-leaf.aifbs-flipped.aifbs-leaf-right { transform: rotateY(-180deg); }
.aifbs-leaf.aifbs-flipped.aifbs-leaf-left { transform: rotateY(180deg); }

.aifbs-leaf.aifbs-no-anim { transition: none !important; }

.aifbs-leaf-face {
	position: absolute;
	inset: 0;
	backface-visibility: hidden;
	-webkit-backface-visibility: hidden;
	overflow: hidden;
	background: var(--aifbs-page-bg);
}
.aifbs-leaf-face img {
	width: 100%;
	height: 100%;
	object-fit: cover;
	display: block;
	user-select: none;
	-webkit-user-drag: none;
}
.aifbs-leaf-back {
	transform: rotateY(180deg);
	display: flex;
	align-items: center;
	justify-content: center;
	background: repeating-linear-gradient(135deg, var(--aifbs-page-bg), var(--aifbs-page-bg) 10px, rgba(0,0,0,.02) 10px, rgba(0,0,0,.02) 20px);
	color: var(--aifbs-accent);
	font-size: 13px;
	letter-spacing: .08em;
	text-transform: uppercase;
	opacity: .55;
}

.aifbs-leaf-shadow {
	position: absolute;
	inset: 0;
	pointer-events: none;
	opacity: 0;
	background: linear-gradient(90deg, rgba(0,0,0,.5), transparent 60%);
	transition: opacity var(--aifbs-flip-ms, 800ms) ease;
}
.aifbs-leaf.aifbs-flipping .aifbs-leaf-shadow { opacity: 1; }

.aifbs-leaf.aifbs-cover .aifbs-leaf-face {
	box-shadow: inset 0 0 0 6px rgba(0,0,0,.25);
}
.aifbs-leaf.aifbs-cover .aifbs-leaf-face img { filter: saturate(1.05) contrast(1.03); }

/* Corner curl hint */
.aifbs-corner-hint {
	position: absolute;
	width: 46px;
	height: 46px;
	bottom: 0;
	pointer-events: none;
	opacity: 0;
	background: linear-gradient(135deg, transparent 50%, rgba(255,255,255,.35) 50%, rgba(255,255,255,.05) 100%);
	transition: opacity .2s ease;
	z-index: 12;
}
.aifbs-leaf-right .aifbs-corner-hint { right: 0; border-radius: 0 0 8px 0; }
.aifbs-leaf-left .aifbs-corner-hint { left: 0; transform: scaleX(-1); border-radius: 0 0 0 8px; }
.aifbs-leaf:hover .aifbs-corner-hint { opacity: 1; }

/* ---------------- Loading spinner ---------------- */
.aifbs-loading {
	position: absolute;
	inset: 0;
	display: flex;
	align-items: center;
	justify-content: center;
	background: rgba(0,0,0,.15);
	z-index: 30;
	transition: opacity .3s ease;
}
.aifbs-loading.aifbs-hidden { opacity: 0; pointer-events: none; }
.aifbs-spinner {
	width: 34px; height: 34px;
	border-radius: 50%;
	border: 3px solid rgba(255,255,255,.25);
	border-top-color: var(--aifbs-accent);
	animation: aifbs-spin .8s linear infinite;
}
@keyframes aifbs-spin { to { transform: rotate(360deg); } }

/* ---------------- Nav arrows ---------------- */
.aifbs-nav {
	position: relative;
	flex: 0 0 auto;
	width: 46px;
	height: 46px;
	border-radius: 50%;
	border: none;
	background: var(--aifbs-toolbar-bg);
	color: var(--aifbs-toolbar-fg);
	cursor: pointer;
	display: flex;
	align-items: center;
	justify-content: center;
	transition: transform .15s ease, opacity .15s ease;
	z-index: 20;
}
.aifbs-nav:hover { transform: scale(1.08); }
.aifbs-nav:disabled { opacity: .25; cursor: default; transform: none; }
.aifbs-flipbook-wrap.aifbs-rtl .aifbs-nav-prev svg,
.aifbs-flipbook-wrap.aifbs-rtl .aifbs-nav-next svg { transform: scaleX(-1); }

/* ---------------- Toolbar ---------------- */
.aifbs-toolbar {
	display: flex;
	align-items: center;
	justify-content: center;
	gap: 18px;
	margin-top: 14px;
	padding: 8px 18px;
	border-radius: 30px;
	background: var(--aifbs-toolbar-bg);
	color: var(--aifbs-toolbar-fg);
	width: fit-content;
	margin-left: auto;
	margin-right: auto;
	font-size: 13px;
}
.aifbs-tool {
	background: transparent;
	border: none;
	color: inherit;
	cursor: pointer;
	font-size: 17px;
	line-height: 1;
	padding: 4px;
	opacity: .85;
}
.aifbs-tool:hover { opacity: 1; }
.aifbs-tool-sound[data-on="0"] .aifbs-icon-sound-on { display: none; }
.aifbs-tool-sound[data-on="1"] .aifbs-icon-sound-off { display: none; }
.aifbs-page-counter { font-variant-numeric: tabular-nums; opacity: .9; }

/* ---------------- Fullscreen ---------------- */
.aifbs-flipbook-wrap:fullscreen,
.aifbs-flipbook-wrap:-webkit-full-screen {
	display: flex;
	flex-direction: column;
	justify-content: center;
	background: #000;
	max-width: none !important;
	padding: 20px;
}
.aifbs-flipbook-wrap:fullscreen .aifbs-stage { flex: 1; }

/* ---------------- Thumbnail rail ---------------- */
.aifbs-thumbnail-rail {
	display: flex;
	gap: 8px;
	overflow-x: auto;
	margin-top: 12px;
	padding: 10px;
	background: var(--aifbs-toolbar-bg);
	border-radius: 10px;
}
.aifbs-thumbnail-rail img {
	width: 54px;
	height: 74px;
	object-fit: cover;
	border-radius: 4px;
	cursor: pointer;
	opacity: .6;
	border: 2px solid transparent;
	transition: opacity .15s ease, border-color .15s ease;
	flex: 0 0 auto;
}
.aifbs-thumbnail-rail img:hover { opacity: 1; }
.aifbs-thumbnail-rail img.aifbs-thumb-active { opacity: 1; border-color: var(--aifbs-accent); }

.aifbs-error {
	padding: 16px;
	background: #fff3f3;
	border: 1px solid #f3caca;
	border-radius: 6px;
	color: #a33;
}

/* ---------------- Responsive ---------------- */
@media (max-width: 720px) {
	.aifbs-stage { padding: 24px 8px; gap: 8px; perspective: 1400px; }
	.aifbs-nav { width: 36px; height: 36px; }
	.aifbs-toolbar { gap: 10px; font-size: 12px; }
	.aifbs-flipbook-wrap[data-view-mode="double"] .aifbs-slot { flex-basis: 50%; }
}
@media (max-width: 480px) {
	/* Force single-page reading on very small screens regardless of setting for readability */
	.aifbs-flipbook-wrap .aifbs-slot-left { display: none; }
	.aifbs-flipbook-wrap .aifbs-slot-right { flex: 1 1 100%; border-radius: 8px; }
	.aifbs-flipbook-wrap .aifbs-leaf { width: 100% !important; left: 0 !important; transform-origin: left center !important; }
}