/**
 * UDM PDF Embed styles
 *
 * Three display modes:
 *   - inline:    compact embed in content flow
 *   - immersive: dark reader frame with title bar + download CTA
 *   - reader:    chrome-light book-style: PDF + dots + download
 */

.udm-pdf-embed,
.udm-pdf-embed * {
	box-sizing: border-box;
}

/* ---------- Inline mode ---------- */

.udm-pdf-embed--inline {
	margin: 1.5em 0;
}

.udm-pdf-embed--inline iframe {
	display: block;
	max-width: 100%;
	border: 1px solid #ddd;
	background: #f7f7f7;
}

.udm-pdf-embed--inline.udm-pdf-embed--pdfjs iframe {
	background: #525659;
}

.udm-pdf-embed__fallback {
	margin: 0.5em 0 0;
	font-size: 0.9em;
	text-align: right;
}

.udm-pdf-embed__fallback a {
	text-decoration: none;
}

.udm-pdf-embed__fallback a:hover,
.udm-pdf-embed__fallback a:focus {
	text-decoration: underline;
}

@media (max-width: 768px) {
	.udm-pdf-embed--inline.udm-pdf-embed--native iframe {
		max-height: 500px;
	}
	.udm-pdf-embed--inline.udm-pdf-embed--pdfjs iframe {
		min-height: 400px;
	}
}

/* ---------- Immersive mode (dark reader frame) ---------- */

.udm-pdf-embed--immersive {
	display: block;
	width: 100%;
	max-width: 100%;
	margin: 2em 0;
	background: #1f2126;
	border-radius: 8px;
	overflow: hidden;
	box-shadow: 0 4px 24px rgba(0, 0, 0, 0.18);
}

.udm-pdf-embed--immersive .udm-pdf-embed__header {
	display: flex;
	align-items: center;
	justify-content: space-between;
	gap: 1em;
	padding: 0.75em 1.25em;
	background: #1f2126;
	color: #f5f5f5;
	border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.udm-pdf-embed--immersive .udm-pdf-embed__title {
	flex: 1 1 auto;
	min-width: 0;
	font-size: 0.95em;
	font-weight: 600;
	letter-spacing: 0.02em;
	opacity: 0.9;
	overflow: hidden;
	text-overflow: ellipsis;
	white-space: nowrap;
}

.udm-pdf-embed--immersive .udm-pdf-embed__download {
	flex: 0 0 auto;
	display: inline-flex;
	align-items: center;
	gap: 0.4em;
	padding: 0.5em 1em;
	background: #ffffff;
	color: #1f2126;
	text-decoration: none;
	border-radius: 4px;
	font-size: 0.85em;
	font-weight: 600;
	white-space: nowrap;
	transition: background-color 0.15s ease;
	max-width: 50%;
	overflow: hidden;
	text-overflow: ellipsis;
}

.udm-pdf-embed--immersive .udm-pdf-embed__download:hover,
.udm-pdf-embed--immersive .udm-pdf-embed__download:focus {
	background: #f0f0f0;
	color: #1f2126;
	text-decoration: none;
}

.udm-pdf-embed--immersive .udm-pdf-embed__frame {
	width: 100%;
	background: #525659;
	line-height: 0;
}

.udm-pdf-embed--immersive iframe {
	display: block;
	width: 100%;
	max-width: 100%;
	border: 0;
	background: #525659;
}

/* ---------- Reader mode (chrome-light, native-feeling) ---------- */

.udm-pdf-embed--reader {
	display: block;
	width: 100%;
	max-width: 100%;
	margin: 2em 0;
	background: transparent;
	/* No frame, no border, no shadow — the PDF is the content. */
}

.udm-pdf-reader__stage {
	position: relative;
	width: 100%;
	line-height: 0;
	user-select: none;
	-webkit-user-select: none;
	touch-action: pan-y;
	/* Fade transition target. The iframe inside fades opacity during page changes. */
}

.udm-pdf-embed--reader iframe {
	display: block;
	width: 100%;
	max-width: 100%;
	border: 0;
	background: transparent;
	transition: opacity 0.18s ease;
}

.udm-pdf-reader__stage--fading iframe {
	opacity: 0.15;
}

/* Dot navigation row */
.udm-pdf-reader__dots {
	display: flex;
	align-items: center;
	justify-content: center;
	gap: 0.5em;
	flex-wrap: wrap;
	margin: 1em auto 0;
	padding: 0.5em 0;
	min-height: 24px;
	opacity: 0;
	transition: opacity 0.3s ease;
}

.udm-pdf-embed--reader.udm-pdf-reader--ready .udm-pdf-reader__dots {
	opacity: 1;
}

.udm-pdf-reader__dot {
	width: 8px;
	height: 8px;
	padding: 0;
	border: 0;
	background: rgba(0, 0, 0, 0.22);
	border-radius: 50%;
	cursor: pointer;
	transition: background-color 0.15s ease, transform 0.15s ease;
	-webkit-appearance: none;
	appearance: none;
}

.udm-pdf-reader__dot:hover,
.udm-pdf-reader__dot:focus-visible {
	background: rgba(0, 0, 0, 0.55);
	outline: none;
	transform: scale(1.2);
}

.udm-pdf-reader__dot--active {
	background: rgba(0, 0, 0, 0.85);
	transform: scale(1.3);
}

.udm-pdf-reader__dot-ellipsis {
	color: rgba(0, 0, 0, 0.35);
	font-size: 0.85em;
	letter-spacing: 0.1em;
	line-height: 1;
	user-select: none;
}

/* Download link row */
.udm-pdf-reader__download-row {
	margin: 0.75em 0 0;
	padding: 0;
	text-align: center;
}

.udm-pdf-reader__download {
	display: inline-flex;
	align-items: center;
	gap: 0.4em;
	font-size: 0.9em;
	color: inherit;
	text-decoration: none;
	opacity: 0.7;
	transition: opacity 0.15s ease;
}

.udm-pdf-reader__download:hover,
.udm-pdf-reader__download:focus {
	opacity: 1;
	text-decoration: underline;
}

/* ---------- Mobile ---------- */

@media (max-width: 768px) {
	.udm-pdf-embed--immersive .udm-pdf-embed__header {
		padding: 0.6em 0.85em;
	}
	.udm-pdf-embed--immersive .udm-pdf-embed__title {
		font-size: 0.85em;
	}
	.udm-pdf-embed--immersive .udm-pdf-embed__download {
		padding: 0.4em 0.75em;
		font-size: 0.8em;
	}

	.udm-pdf-reader__dot {
		width: 7px;
		height: 7px;
	}

	.udm-pdf-reader__dots {
		gap: 0.4em;
	}

	.udm-pdf-reader__download {
		font-size: 0.85em;
	}
}

/* ---------- Reduced motion ---------- */

@media (prefers-reduced-motion: reduce) {
	.udm-pdf-embed--reader iframe,
	.udm-pdf-reader__dot,
	.udm-pdf-reader__dots,
	.udm-pdf-reader__download {
		transition: none;
	}
}