/* ── PDF Viewer ── */
.fr-pdf-viewer {
	--viewer-accent: #b86b3a;
	--viewer-bg: #1e2a26;
	--viewer-toolbar: #2a3832;
	--viewer-sidebar: #243830;
	--viewer-text: rgba(255, 255, 255, 0.9);
	--viewer-text-muted: rgba(255, 255, 255, 0.55);
	--viewer-border: rgba(255, 255, 255, 0.08);

	width: 100%;
	background: var(--viewer-bg);
	border-radius: 6px;
	overflow: hidden;
	border: 1px solid rgba(255, 255, 255, 0.07);
	box-shadow:
		0 2px 4px rgba(0, 0, 0, 0.12),
		0 16px 48px rgba(0, 0, 0, 0.38),
		0 32px 80px rgba(0, 0, 0, 0.22),
		inset 0 1px 0 rgba(255, 255, 255, 0.05);
}

.fr-pdf-error {
	color: #fff;
	text-align: center;
	padding: 2rem;
}

/* Toolbar */
.fr-pdf-viewer__toolbar {
	display: flex;
	align-items: center;
	justify-content: space-between;
	padding: 0.875rem 1.5rem;
	background: var(--viewer-toolbar);
	border-bottom: 1px solid var(--viewer-border);
	gap: 1rem;
	min-height: 56px;
}

.fr-pdf-viewer__toolbar-left,
.fr-pdf-viewer__toolbar-right {
	display: flex;
	align-items: center;
	gap: 0.5rem;
	flex-shrink: 0;
}

.fr-pdf-viewer__toolbar-center {
	flex: 1;
	text-align: center;
	overflow: hidden;
	padding: 0 1rem;
}

.fr-pdf-viewer__title {
	color: var(--viewer-text);
	font-size: 0.8125rem;
	font-weight: 600;
	letter-spacing: 0.05em;
	text-transform: uppercase;
	white-space: nowrap;
	overflow: hidden;
	text-overflow: ellipsis;
}

.fr-pdf-viewer__page-info {
	color: var(--viewer-text-muted);
	font-size: 0.875rem;
	font-weight: 500;
	margin-right: 0.75rem;
	min-width: 56px;
	text-align: center;
}

.fr-pdf-viewer__toolbar button {
	background: none;
	border: none;
	color: var(--viewer-text-muted);
	cursor: pointer;
	padding: 0.4rem;
	border-radius: 4px;
	display: flex;
	align-items: center;
	justify-content: center;
	transition: color 0.2s, background 0.2s;
}

.fr-pdf-viewer__toolbar button:hover {
	color: var(--viewer-text);
	background: rgba(255, 255, 255, 0.08);
}

.fr-pdf-viewer__toc-toggle {
	display: none;
}

/* Body */
.fr-pdf-viewer__body {
	display: flex;
	min-height: 480px;
	max-height: 620px;
}

/* Sidebar */
.fr-pdf-viewer__sidebar {
	width: 220px;
	flex-shrink: 0;
	background: var(--viewer-sidebar);
	border-right: 1px solid var(--viewer-border);
	overflow-y: auto;
	padding: 1.25rem 0;
}

.fr-pdf-viewer__sidebar-title {
	font-size: 0.6875rem;
	font-weight: 700;
	text-transform: uppercase;
	letter-spacing: 0.08em;
	color: var(--viewer-text-muted);
	padding: 0 1.25rem 1rem;
	margin: 0;
}

.fr-pdf-viewer__toc {
	display: flex;
	flex-direction: column;
}

.fr-pdf-viewer__toc-item {
	background: none;
	border: none;
	color: var(--viewer-text-muted);
	text-align: left;
	padding: 0.5625rem 1.25rem;
	font-size: 0.8125rem;
	line-height: 1.45;
	cursor: pointer;
	transition: color 0.2s, background 0.2s;
	border-left: 3px solid transparent;
}

.fr-pdf-viewer__toc-item:hover {
	color: var(--viewer-text);
	background: rgba(255, 255, 255, 0.05);
}

.fr-pdf-viewer__toc-item.is-active {
	color: var(--viewer-text);
	border-left-color: var(--viewer-accent);
	background: rgba(255, 255, 255, 0.05);
}

/* Main canvas area */
.fr-pdf-viewer__main {
	flex: 1;
	display: flex;
	align-items: center;
	position: relative;
	overflow: hidden;
	background: var(--viewer-bg);
	min-width: 0;
}

.fr-pdf-viewer__canvas-wrap {
	flex: 1;
	display: flex;
	align-items: center;
	justify-content: center;
	overflow: auto;
	padding: 1.25rem 2.5rem;
	height: 100%;
	-webkit-overflow-scrolling: touch;
}

.fr-pdf-viewer__pages {
	display: flex;
	align-items: center;
	justify-content: center;
	gap: 8px;
	transition: transform 0.2s;
	flex-shrink: 0;
}

.fr-pdf-viewer__page {
	box-shadow: 0 4px 24px rgba(0, 0, 0, 0.45);
	background: #fff;
	flex-shrink: 0;
	line-height: 0;
}

.fr-pdf-viewer__page canvas {
	display: block;
	max-width: none;
	width: auto;
	height: auto;
}

.fr-pdf-viewer__loading {
	color: var(--viewer-text-muted);
	font-size: 0.9375rem;
}

/* Navigation arrows */
.fr-pdf-viewer__nav {
	position: absolute;
	top: 50%;
	transform: translateY(-50%);
	background: rgba(0, 0, 0, 0.4);
	border: none;
	color: rgba(255, 255, 255, 0.75);
	cursor: pointer;
	padding: 1rem 0.625rem;
	border-radius: 4px;
	z-index: 2;
	transition: background 0.2s, color 0.2s;
	display: flex;
	align-items: center;
}

.fr-pdf-viewer__nav:hover {
	background: rgba(0, 0, 0, 0.6);
	color: #fff;
}

.fr-pdf-viewer__nav--prev {
	left: 0.375rem;
}

.fr-pdf-viewer__nav--next {
	right: 0.375rem;
}

.fr-pdf-viewer__nav:disabled {
	opacity: 0.25;
	cursor: default;
}

/* Thumbnails */
.fr-pdf-viewer__thumbnails {
	display: flex;
	gap: 8px;
	padding: 1rem 1.5rem;
	background: var(--viewer-toolbar);
	border-top: 1px solid var(--viewer-border);
	overflow-x: auto;
	-webkit-overflow-scrolling: touch;
	scrollbar-width: thin;
	justify-content: center;
}

.fr-pdf-viewer__thumb {
	flex-shrink: 0;
	width: 56px;
	height: 78px;
	border: 2px solid transparent;
	border-radius: 3px;
	overflow: hidden;
	cursor: pointer;
	background: #fff;
	transition: border-color 0.2s, opacity 0.2s;
	opacity: 0.55;
}

.fr-pdf-viewer__thumb:hover {
	opacity: 0.85;
}

.fr-pdf-viewer__thumb.is-active {
	border-color: var(--viewer-accent);
	opacity: 1;
}

.fr-pdf-viewer__thumb canvas {
	width: 100%;
	height: 100%;
	object-fit: cover;
}

/* Fullscreen */
.fr-pdf-viewer.is-fullscreen {
	position: fixed;
	inset: 0;
	z-index: 99999;
	border-radius: 0;
	max-height: none;
}

.fr-pdf-viewer.is-fullscreen .fr-pdf-viewer__body {
	max-height: calc(100vh - 130px);
}

/* ── Desktop: large immersive viewer ── */
@media (min-width: 961px) {
	.fr-pdf-viewer {
		border-radius: 8px;
	}

	.fr-pdf-viewer__body {
		min-height: 820px;
		max-height: 960px;
	}

	.fr-pdf-viewer__sidebar {
		width: 210px;
	}

	.fr-pdf-viewer__toolbar {
		padding: 1rem 2rem;
		min-height: 58px;
	}

	.fr-pdf-viewer__title {
		font-size: 0.875rem;
		letter-spacing: 0.06em;
	}

	.fr-pdf-viewer__canvas-wrap {
		padding: 0.625rem 2rem;
	}

	.fr-pdf-viewer__nav {
		padding: 1rem 0.5rem;
	}

	.fr-pdf-viewer__nav--prev {
		left: 0.25rem;
	}

	.fr-pdf-viewer__nav--next {
		right: 0.25rem;
	}

	.fr-pdf-viewer__thumb {
		width: 68px;
		height: 94px;
	}

	.fr-pdf-viewer__thumbnails {
		padding: 1.125rem 2rem;
		gap: 10px;
	}
}

@media (min-width: 1440px) {
	.fr-pdf-viewer__body {
		min-height: 900px;
		max-height: 1020px;
	}

	.fr-pdf-viewer__sidebar {
		width: 220px;
	}

	.fr-pdf-viewer__toc-item {
		font-size: 0.84375rem;
		padding: 0.625rem 1.5rem;
	}

	.fr-pdf-viewer__canvas-wrap {
		padding: 0.625rem 2.25rem;
	}

	.fr-pdf-viewer__thumb {
		width: 72px;
		height: 100px;
	}
}

@media (min-width: 1920px) {
	.fr-pdf-viewer__body {
		min-height: 920px;
		max-height: 1080px;
	}

	.fr-pdf-viewer__canvas-wrap {
		padding: 0.5rem 2.5rem;
	}
}

/* ── Mobile / tablet ── */
@media (max-width: 960px) {
	.fr-pdf-viewer {
		border-radius: 4px;
	}

	.fr-pdf-viewer__sidebar {
		position: absolute;
		left: 0;
		top: 0;
		bottom: 0;
		z-index: 10;
		transform: translateX(-100%);
		transition: transform 0.3s;
		box-shadow: 4px 0 16px rgba(0, 0, 0, 0.3);
	}

	.fr-pdf-viewer__sidebar.is-open {
		transform: translateX(0);
	}

	.fr-pdf-viewer__toc-toggle {
		display: flex;
	}

	.fr-pdf-viewer__body {
		min-height: 440px;
		max-height: 580px;
	}

	.fr-pdf-viewer__pages {
		flex-direction: column;
	}

	.fr-pdf-viewer__canvas-wrap {
		padding: 1rem 2.75rem;
	}

	.fr-pdf-viewer__nav {
		padding: 0.5rem 0.25rem;
	}

	.fr-pdf-viewer__nav svg {
		width: 24px;
		height: 24px;
	}

	.fr-pdf-viewer__thumbnails {
		justify-content: flex-start;
	}
}

@media (max-width: 600px) {
	.fr-pdf-viewer__toolbar-center {
		display: none;
	}

	.fr-pdf-viewer__body {
		min-height: 400px;
		max-height: 520px;
	}

	.fr-pdf-viewer__thumb {
		width: 44px;
		height: 62px;
	}
}