/**
 * Photo Gallery Lightbox — gallery grid styles.
 * Vanilla CSS, no build step required. Custom properties are set inline
 * per-instance by PHP (see class-pgl-shortcode.php) so multiple galleries
 * with different settings can coexist on one page.
 */

.pgl-gallery {
	--pgl-columns: 4;
	--pgl-radius: 8px;
	--pgl-theme-color: #0b5fa5;
	--pgl-anim-speed: 300ms;
	--pgl-gap: 16px;

	margin: 1.5em 0;
	box-sizing: border-box;
}

.pgl-gallery *,
.pgl-gallery *::before,
.pgl-gallery *::after {
	box-sizing: inherit;
}

.pgl-grid {
	display: grid;
	grid-template-columns: repeat(var(--pgl-columns), 1fr);
	gap: var(--pgl-gap);
	margin: 0;
	padding: 0;
	list-style: none;
}

/* Responsive column collapse to avoid cramped thumbnails on small screens. */
@media (max-width: 1024px) {
	.pgl-grid {
		grid-template-columns: repeat(min(3, var(--pgl-columns)), 1fr);
	}
}

@media (max-width: 700px) {
	.pgl-grid {
		grid-template-columns: repeat(min(2, var(--pgl-columns)), 1fr);
	}
}

@media (max-width: 420px) {
	.pgl-grid {
		grid-template-columns: 1fr 1fr;
		--pgl-gap: 10px;
	}
}

.pgl-grid-item {
	margin: 0;
}

.pgl-figure {
	position: relative;
	margin: 0;
	overflow: hidden;
	border-radius: var(--pgl-radius);
	background: #eef1f4;
	/* Reserve a square box before the image loads to prevent layout shift (CLS). */
	aspect-ratio: 1 / 1;
}

.pgl-image {
	display: block;
	width: 100%;
	height: 100%;
	object-fit: cover;
	transition: transform var(--pgl-anim-speed) ease, opacity var(--pgl-anim-speed) ease;
}

.pgl-trigger {
	display: block;
	width: 100%;
	height: 100%;
	padding: 0;
	border: 0;
	margin: 0;
	background: none;
	cursor: zoom-in;
	font: inherit;
}

/* Strong, visible keyboard focus indicator (WCAG 2.1 AA 2.4.7). */
.pgl-trigger:focus-visible,
.pgl-load-more:focus-visible {
	outline: 3px solid var(--pgl-theme-color);
	outline-offset: 2px;
}

/* Hover / focus effects — each opt-in via data attribute set from settings. */
.pgl-hover-zoom .pgl-trigger:hover .pgl-image,
.pgl-hover-zoom .pgl-trigger:focus-visible .pgl-image {
	transform: scale(1.06);
}

.pgl-hover-fade .pgl-trigger:hover .pgl-image,
.pgl-hover-fade .pgl-trigger:focus-visible .pgl-image {
	opacity: 0.8;
}

.pgl-hover-lift .pgl-figure {
	transition: box-shadow var(--pgl-anim-speed) ease, transform var(--pgl-anim-speed) ease;
}

.pgl-hover-lift .pgl-trigger:hover ~ *,
.pgl-hover-lift:hover .pgl-figure,
.pgl-hover-lift .pgl-trigger:focus-visible {
	transform: none;
}

.pgl-hover-lift .pgl-grid-item:hover .pgl-figure,
.pgl-hover-lift .pgl-grid-item:focus-within .pgl-figure {
	box-shadow: 0 10px 24px rgba(0, 0, 0, 0.18);
	transform: translateY(-4px);
}

.pgl-caption {
	margin-top: 0.5em;
	font-size: 0.9rem;
	line-height: 1.4;
	color: #2b2f33;
	overflow-wrap: break-word;
}

.pgl-pagination {
	display: flex;
	justify-content: center;
	margin-top: 1.5em;
}

.pgl-load-more {
	background: var(--pgl-theme-color);
	color: #fff;
	border: 0;
	border-radius: 6px;
	padding: 0.65em 1.6em;
	font-size: 1rem;
	cursor: pointer;
	transition: opacity var(--pgl-anim-speed) ease;
}

.pgl-load-more:hover {
	opacity: 0.9;
}

.pgl-load-more[hidden] {
	display: none;
}

.pgl-grid-item[hidden] {
	display: none;
}

.pgl-notice {
	padding: 0.75em 1em;
	background: #fff3cd;
	border: 1px solid #ffe69c;
	border-radius: 4px;
	color: #664d03;
	font-size: 0.9rem;
}

/* Utility class matching WordPress core's screen-reader-text in case the
   active theme doesn't define it. */
.pgl-gallery .screen-reader-text {
	position: absolute;
	width: 1px;
	height: 1px;
	padding: 0;
	margin: -1px;
	overflow: hidden;
	clip: rect(0, 0, 0, 0);
	white-space: nowrap;
	border: 0;
}

/* Respect the visitor's OS-level motion preference (WCAG 2.3.3). */
@media (prefers-reduced-motion: reduce) {
	.pgl-image,
	.pgl-figure,
	.pgl-load-more {
		transition: none !important;
	}
}