/*
	The screenshot lightbox (lightbox.js), shared by the manual and the
	landing page — one file, so the two cannot drift. Colours come from the
	page's own palette variables, which both pages define alike; the
	fallbacks are the same values, for a page that does not.
*/

/* The static link around every screenshot: it must not change the layout. */
a.zoom { display: block; cursor: zoom-in; }
a.zoom:focus-visible {
	outline: 2px solid var(--accent, #a882ff);
	outline-offset: 4px;
	border-radius: var(--radius, 14px);
}

/* The page behind the open dialog does not scroll. */
html.lightbox-open { overflow: hidden; }

dialog.lightbox {
	position: fixed;
	inset: 0;
	width: 100%;
	height: 100%;
	max-width: none;
	max-height: none;
	margin: 0;
	/* room for the × at the top and the arrows at the sides */
	padding: 64px 72px 24px;
	border: 0;
	background: transparent;
	color: var(--text, #e6e2f0);
	overflow: hidden;
}
dialog.lightbox[open] {
	display: flex;
	align-items: center;
	justify-content: center;
}
/* Dark enough, and blurred, that the page's text cannot be read through it
   and compete with the caption. */
dialog.lightbox::backdrop {
	background: rgba(10, 8, 18, 0.96);
	-webkit-backdrop-filter: blur(6px);
	backdrop-filter: blur(6px);
}

dialog.lightbox figure {
	margin: 0;
	display: flex;
	flex-direction: column;
	align-items: center;
	max-width: 100%;
	max-height: 100%;
}
/* As large as the viewport allows, never past the image's own size. */
dialog.lightbox img {
	display: block;
	width: auto;
	height: auto;
	max-width: 100%;
	max-height: calc(100vh - 88px - 4.5em);
	max-height: calc(100dvh - 88px - 4.5em);
	border-radius: 10px;
	border: 1px solid var(--border, #3a3153);
	box-shadow: 0 24px 80px rgba(0, 0, 0, 0.6);
	background: var(--bg, #171321);
}
dialog.lightbox figcaption {
	margin-top: 12px;
	max-width: 72ch;
	font-size: 0.92rem;
	line-height: 1.5;
	text-align: center;
	color: var(--muted, #a89fc0);
}

dialog.lightbox button {
	position: fixed;
	width: 44px;
	height: 44px;
	display: flex;
	align-items: center;
	justify-content: center;
	padding: 0;
	border: 1px solid var(--border, #3a3153);
	border-radius: 50%;
	background: rgba(33, 27, 48, 0.85);
	color: var(--text, #e6e2f0);
	font: 400 26px/1 -apple-system, 'Segoe UI', Roboto, sans-serif;
	cursor: pointer;
}
dialog.lightbox button:hover { background: var(--bg-3, #2b2440); border-color: var(--accent, #a882ff); }
dialog.lightbox button:focus-visible { outline: 2px solid var(--accent, #a882ff); outline-offset: 2px; }
dialog.lightbox button[hidden] { display: none; }
.lightbox-close { top: 12px; right: 12px; }
.lightbox-prev, .lightbox-next { top: 50%; transform: translateY(-50%); }
.lightbox-prev { left: 12px; }
.lightbox-next { right: 12px; }

@media (max-width: 640px) {
	dialog.lightbox { padding: 64px 12px 16px; }
	/* On a phone the arrows sit at the foot, clear of the picture. */
	.lightbox-prev, .lightbox-next { top: auto; bottom: 12px; transform: none; }
}

@media (prefers-reduced-motion: no-preference) {
	dialog.lightbox[open] img { animation: lightbox-zoom 0.18s ease-out; }
	dialog.lightbox[open]::backdrop { animation: lightbox-fade 0.18s ease-out; }
}
@keyframes lightbox-zoom { from { opacity: 0; transform: scale(0.96); } }
@keyframes lightbox-fade { from { opacity: 0; } }