/*
 * Flipset document library ([flipset_library], the Library block and the page-builder widgets).
 *
 * Everything is scoped under .flipset-library. Colours come from the custom properties declared
 * once on the wrapper, so a theme can restyle the grid with a single rule, e.g.
 *   .flipset-library { --flipset-accent: #b32d2e; }
 * Surfaces, borders and muted text are derived from the surrounding text colour (currentColor), so
 * the grid follows light and dark themes without a separate dark stylesheet.
 */

.flipset-library {
	/* Fallbacks for browsers without color-mix(); all pairs meet WCAG AA on a white page. */
	--flipset-accent: #2271b1;
	--flipset-text: currentColor;
	--flipset-muted: #50575e;
	--flipset-surface: #fff;
	--flipset-surface-alt: #f6f7f7;
	--flipset-border: #dcdcde;
	--flipset-field-border: #8c8f94;

	/* Spacing scale (8-pt): gaps between cards, between blocks, inside cards. */
	--flipset-space-1: 8px;
	--flipset-space-2: 16px;
	--flipset-space-3: 24px;
	--flipset-radius: 10px;
	--flipset-shadow: 0 1px 2px rgba(0, 0, 0, 0.06), 0 2px 8px rgba(0, 0, 0, 0.05);
	--flipset-shadow-lift: 0 4px 10px rgba(0, 0, 0, 0.1), 0 10px 24px rgba(0, 0, 0, 0.08);
	--flipset-target: 40px;

	position: relative;
	margin-block: var(--flipset-space-3);
	color: inherit;
	line-height: 1.4;
}

@supports (color: color-mix(in srgb, red, blue)) {
	.flipset-library {
		--flipset-muted: color-mix(in srgb, currentColor 72%, transparent);
		--flipset-surface: color-mix(in srgb, currentColor 4%, transparent);
		--flipset-surface-alt: color-mix(in srgb, currentColor 7%, transparent);
		--flipset-border: color-mix(in srgb, currentColor 18%, transparent);
		--flipset-field-border: color-mix(in srgb, currentColor 55%, transparent);
	}
}

.flipset-library *,
.flipset-library *::before,
.flipset-library *::after {
	box-sizing: border-box;
}

/* Loading state: dimmed content, an indeterminate bar on top, no clicks. */
.flipset-library.is-loading {
	pointer-events: none;
}

.flipset-library.is-loading > * {
	opacity: 0.55;
}

.flipset-library.is-loading::before {
	content: "";
	position: absolute;
	inset-block-start: 0;
	inset-inline: 0;
	z-index: 1;
	height: 3px;
	border-radius: 3px;
	background: linear-gradient(90deg, transparent, var(--flipset-accent), transparent) 0 0 / 40% 100% no-repeat;
}

@media (prefers-reduced-motion: no-preference) {
	.flipset-library > * {
		transition: opacity 0.15s ease;
	}

	.flipset-library.is-loading::before {
		animation: flipset-library-bar 1s ease-in-out infinite;
	}
}

@keyframes flipset-library-bar {
	from {
		background-position: -40% 0;
	}

	to {
		background-position: 140% 0;
	}
}

/* Search */
.flipset-library .flipset-library-search {
	display: flex;
	flex-wrap: nowrap;
	gap: var(--flipset-space-1);
	align-items: stretch;
	margin: 0 0 var(--flipset-space-2);
}

.flipset-library .flipset-library-search input[type="search"] {
	flex: 1 1 0;
	min-width: 0;
	min-height: var(--flipset-target);
	margin: 0;
	padding-block: 0;
	padding-inline: 12px;
	border: 1px solid var(--flipset-field-border);
	border-radius: 8px;
	background: var(--flipset-surface);
	color: inherit;
	font: inherit;
}

.flipset-library .flipset-library-search-submit {
	flex: 0 0 auto;
	min-height: var(--flipset-target);
	margin: 0;
	padding-block: 0;
	padding-inline: var(--flipset-space-2);
	border: 1px solid var(--flipset-accent);
	border-radius: 8px;
	background: var(--flipset-accent);
	color: #fff;
	font: inherit;
	font-weight: 600;
	cursor: pointer;
}

.flipset-library .flipset-library-search-submit:hover {
	filter: brightness(0.92);
}

/* Grid: the "columns" attribute is the upper bound (--flipset-cols). Cards never get narrower than
   140px, and the phone/tablet breakpoints below cap it at 1 / 2 columns. */
.flipset-library .flipset-library-grid {
	--flipset-grid-gap: var(--flipset-space-2);
	--flipset-grid-cols: var(--flipset-cols, 3);

	display: grid;
	grid-template-columns: repeat(auto-fill, minmax(max(140px, calc((100% - (var(--flipset-grid-cols) - 1) * var(--flipset-grid-gap)) / var(--flipset-grid-cols))), 1fr));
	gap: var(--flipset-grid-gap);
	margin: 0;
	padding: 0;
	list-style: none;
}

@media (max-width: 768px) {
	.flipset-library .flipset-library-grid {
		--flipset-grid-cols: min(var(--flipset-cols, 3), 2);
	}
}

@media (max-width: 480px) {
	.flipset-library .flipset-library-grid {
		--flipset-grid-cols: 1;
	}
}

.flipset-library .flipset-library-item {
	display: flex;
	flex-direction: column;
	min-width: 0;
	margin: 0;
	padding: 0;
	list-style: none;
}

.flipset-library .flipset-library-item.is-open {
	grid-column: 1 / -1;
}

/* Card */
.flipset-library .flipset-library-card {
	display: flex;
	flex: 1 1 auto;
	flex-direction: column;
	align-items: stretch;
	width: 100%;
	min-height: var(--flipset-target);
	margin: 0;
	padding: 0;
	border: 1px solid var(--flipset-border);
	border-radius: var(--flipset-radius);
	background: var(--flipset-surface);
	box-shadow: var(--flipset-shadow);
	color: var(--flipset-text);
	font: inherit;
	text-align: start;
	text-decoration: none;
	cursor: pointer;
	overflow: hidden;
}

@media (prefers-reduced-motion: no-preference) {
	.flipset-library .flipset-library-card {
		transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
	}
}

@media (hover: hover) {
	.flipset-library .flipset-library-card:hover {
		border-color: var(--flipset-accent);
		box-shadow: var(--flipset-shadow-lift);
	}
}

@media (hover: hover) and (prefers-reduced-motion: no-preference) {
	.flipset-library .flipset-library-card:hover {
		transform: translateY(-3px);
	}
}

.flipset-library .flipset-library-card:focus {
	border-color: var(--flipset-accent);
}

.flipset-library .flipset-library-card:focus-visible {
	outline: 3px solid var(--flipset-accent);
	outline-offset: 3px;
	box-shadow: var(--flipset-shadow-lift);
}

@media (prefers-reduced-motion: no-preference) {
	.flipset-library .flipset-library-card:focus-visible {
		transform: translateY(-3px);
	}
}

.flipset-library .flipset-library-card[aria-expanded="true"] {
	border-color: var(--flipset-accent);
}

/* Cover: always 3:4, cropped to fill, neutral placeholder when there is no thumbnail. */
.flipset-library .flipset-library-thumb {
	display: block;
	flex: 0 0 auto;
	width: 100%;
	aspect-ratio: 3 / 4;
	background: var(--flipset-surface-alt);
	overflow: hidden;
}

.flipset-library .flipset-library-image {
	display: block;
	width: 100%;
	height: 100%;
	max-width: none;
	margin: 0;
	object-fit: cover;
	object-position: top center;
}

.flipset-library .flipset-library-placeholder {
	display: flex;
	align-items: center;
	justify-content: center;
	width: 100%;
	height: 100%;
	color: var(--flipset-muted);
}

/* Text: title clamped to two lines, muted meta underneath. The body grows so cards in a row
   keep the same height whatever the title length. */
.flipset-library .flipset-library-body {
	display: flex;
	flex: 1 1 auto;
	flex-direction: column;
	gap: 4px;
	min-width: 0;
	padding: 12px var(--flipset-space-2) var(--flipset-space-2);
}

.flipset-library .flipset-library-title {
	display: -webkit-box;
	-webkit-box-orient: vertical;
	-webkit-line-clamp: 2;
	line-clamp: 2;
	overflow: hidden;
	overflow-wrap: anywhere;
	font-size: 15px;
	font-weight: 600;
	line-height: 1.35;
}

.flipset-library .flipset-library-meta {
	display: block;
	margin-block-start: auto;
	color: var(--flipset-muted);
	font-size: 13px;
	line-height: 1.3;
}

/* Open card becomes a slim header row above the viewer instead of a full-width 3:4 cover. */
.flipset-library .flipset-library-item.is-open .flipset-library-card {
	flex: 0 0 auto;
	flex-direction: row;
	align-items: center;
	border-end-start-radius: 0;
	border-end-end-radius: 0;
	box-shadow: none;
	transform: none;
}

.flipset-library .flipset-library-item.is-open .flipset-library-thumb {
	flex: 0 0 56px;
	width: 56px;
}

.flipset-library .flipset-library-item.is-open .flipset-library-body {
	flex: 1 1 auto;
	padding-block: var(--flipset-space-1);
}

.flipset-library .flipset-library-item.is-open .flipset-library-meta {
	margin-block-start: 0;
}

/* Viewer area */
.flipset-library .flipset-library-embed {
	margin: 0;
	padding: var(--flipset-space-1);
	border: 1px solid var(--flipset-accent);
	border-block-start: 0;
	border-end-start-radius: var(--flipset-radius);
	border-end-end-radius: var(--flipset-radius);
	background: var(--flipset-surface-alt);
}

.flipset-library .flipset-library-embed[hidden] {
	display: none;
}

.flipset-library .flipset-library-embed .flipset-wrap {
	margin: 0;
}

/* Pagination */
.flipset-library .flipset-library-pager {
	margin-block-start: var(--flipset-space-3);
}

.flipset-library .flipset-library-pager .page-numbers {
	display: flex;
	flex-wrap: wrap;
	gap: var(--flipset-space-1);
	align-items: center;
	margin: 0;
	padding: 0;
	list-style: none;
}

.flipset-library .flipset-library-pager li {
	margin: 0;
	padding: 0;
	list-style: none;
}

.flipset-library .flipset-library-pager a.page-numbers,
.flipset-library .flipset-library-pager span.page-numbers {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	min-width: var(--flipset-target);
	min-height: var(--flipset-target);
	padding-block: 0;
	padding-inline: 12px;
	border: 1px solid var(--flipset-border);
	border-radius: 8px;
	background: var(--flipset-surface);
	color: inherit;
	font-variant-numeric: tabular-nums;
	text-decoration: none;
}

.flipset-library .flipset-library-pager a.page-numbers:hover {
	border-color: var(--flipset-accent);
	color: var(--flipset-accent);
}

.flipset-library .flipset-library-pager a.page-numbers:focus-visible {
	outline: 3px solid var(--flipset-accent);
	outline-offset: 2px;
}

.flipset-library .flipset-library-pager .page-numbers.current,
.flipset-library .flipset-library-pager [aria-current="page"] {
	border-color: var(--flipset-accent);
	background: var(--flipset-accent);
	color: #fff;
	font-weight: 600;
}

.flipset-library .flipset-library-pager .page-numbers.dots {
	min-width: 0;
	border-color: transparent;
	background: transparent;
}

/* Keyboard focus for the search controls (the browser default ring is kept off-white themes). */
.flipset-library .flipset-library-search input[type="search"]:focus-visible,
.flipset-library .flipset-library-search-submit:focus-visible {
	outline: 3px solid var(--flipset-accent);
	outline-offset: 2px;
}

/* Empty state */
.flipset-library .flipset-library-empty {
	padding: var(--flipset-space-3) var(--flipset-space-2);
	border: 1px dashed var(--flipset-field-border);
	border-radius: var(--flipset-radius);
	background: var(--flipset-surface-alt);
	color: inherit;
	text-align: center;
}

.flipset-library .flipset-library-empty p {
	margin: 0;
}

.flipset-library .flipset-library-empty p + p {
	margin-block-start: var(--flipset-space-1);
}

.flipset-library .flipset-library-empty a {
	color: var(--flipset-accent);
}

/* Windows high-contrast / forced colours: keep the card edges and the focus ring. */
@media (forced-colors: active) {
	.flipset-library .flipset-library-card,
	.flipset-library .flipset-library-pager a.page-numbers,
	.flipset-library .flipset-library-pager span.page-numbers {
		border-color: CanvasText;
	}

	.flipset-library .flipset-library-card:focus-visible {
		outline-color: Highlight;
	}
}