/**
 * UT Lightbox — overlay, crossfade, spinner, controls.
 * z-index 100000: trên menu sticky + flatpickr (99999) của theme (PLAN §7).
 */

.ut-lb {
	position: fixed;
	inset: 0;
	z-index: 100000;
	display: none;
	background: rgba(10, 12, 16, 0.92);
	-webkit-tap-highlight-color: transparent;
}
.ut-lb.is-open { display: block; }

html.ut-lb-lock,
html.ut-lb-lock body { overflow: hidden; }

.ut-lb__stage {
	position: absolute;
	inset: 0;
	touch-action: pan-y; /* giữ được swipe ngang tự xử lý */
}

.ut-lb__img {
	position: absolute;
	inset: 0;
	width: 100%;
	height: 100%;
	object-fit: contain;
	padding: 24px;
	box-sizing: border-box;
	opacity: 0;
	transition: opacity 0.28s ease;
	pointer-events: none; /* click xuyên xuống stage để close-on-bg hoạt động */
}
.ut-lb__img.is-active { opacity: 1; }

/* transition modes */
.ut-lb[data-transition="none"] .ut-lb__img { transition: none; }
.ut-lb[data-transition="fade"] .ut-lb__img { transition: opacity 0.18s ease; }
@media (prefers-reduced-motion: reduce) {
	.ut-lb__img { transition: none !important; }
}

/* spinner */
.ut-lb__spinner {
	position: absolute;
	top: 50%;
	left: 50%;
	width: 34px;
	height: 34px;
	margin: -17px 0 0 -17px;
	border: 3px solid rgba(255, 255, 255, 0.25);
	border-top-color: #fff;
	border-radius: 50%;
	opacity: 0;
	animation: ut-lb-spin 0.7s linear infinite;
}
.ut-lb__spinner.is-on { opacity: 1; }
@keyframes ut-lb-spin { to { transform: rotate(360deg); } }

/* controls */
.ut-lb__close,
.ut-lb__nav {
	position: absolute;
	z-index: 2;
	border: 0;
	background: rgba(0, 0, 0, 0.35);
	color: #fff;
	cursor: pointer;
	font-size: 20px;
	line-height: 1;
	width: 44px;
	height: 44px;
	border-radius: 50%;
	display: flex;
	align-items: center;
	justify-content: center;
	transition: background 0.15s;
}
.ut-lb__close:hover,
.ut-lb__nav:hover { background: rgba(0, 0, 0, 0.6); }
.ut-lb__close:focus-visible,
.ut-lb__nav:focus-visible { outline: 2px solid #fff; outline-offset: 2px; }

.ut-lb__close { top: 16px; right: 16px; }
.ut-lb__nav { top: 50%; transform: translateY(-50%); }
.ut-lb__nav--prev { left: 12px; }
.ut-lb__nav--next { right: 12px; }

.ut-lb__counter {
	position: absolute;
	top: 24px;
	left: 24px;
	color: rgba(255, 255, 255, 0.85);
	font-size: 14px;
	letter-spacing: 0.03em;
	user-select: none;
}

.ut-lb__caption {
	position: absolute;
	left: 50%;
	bottom: 18px;
	transform: translateX(-50%);
	max-width: min(80vw, 700px);
	padding: 6px 14px;
	border-radius: 6px;
	background: rgba(0, 0, 0, 0.45);
	color: #fff;
	font-size: 14px;
	text-align: center;
}

@media (max-width: 600px) {
	.ut-lb__img { padding: 8px; }
	.ut-lb__close { top: 10px; right: 10px; }
	.ut-lb__nav { width: 38px; height: 38px; }
	.ut-lb__counter { top: 16px; left: 14px; font-size: 13px; }
}