/* AI Systems page-specific styles */

/* Filter bar */
.filters{
	padding: 32px 0 0;
}

.filter-bar{
	display: flex;
	gap: 8px;
	flex-wrap: wrap;
}

.filter-btn{
	font-family: inherit;
	font-size: 13px;
	font-weight: 600;
	letter-spacing: .06em;
	text-transform: uppercase;
	color: var(--text);
	background: transparent;
	border: 1px solid var(--border);
	border-radius: 999px;
	padding: 8px 18px;
	cursor: pointer;
	transition: color .2s ease, background .2s ease, border-color .2s ease;
}

.filter-btn:hover{
	color: var(--accent);
	border-color: var(--accent);
}

.filter-btn.active{
	color: var(--bg);
	background: var(--accent);
	border-color: var(--accent);
}

/* Card grid */
.cards-section{
	padding: 24px 0 48px;
}

.card-grid{
	display: grid;
	grid-template-columns: 1fr 1fr;
	gap: 16px;
}

.card-grid .card-item.featured{
	grid-column: 1 / -1;
}

/* Card */
.card-item{
	padding: 28px;
	border: 1px solid var(--border);
	background: var(--card);
	border-radius: var(--radius);
	box-shadow: var(--shadow);
	opacity: 0;
	transform: translateY(24px);
	transition: opacity .6s ease, transform .4s ease;
}

.card-item.visible{
	opacity: 1;
	transform: translateY(0);
}

.card-item.hidden{
	display: none;
}

.card-meta{
	display: flex;
	align-items: center;
	gap: 12px;
	margin-bottom: 12px;
}

.card-category{
	font-size: 11px;
	letter-spacing: .1em;
	text-transform: uppercase;
	color: var(--accent);
}

.card-date{
	font-size: 11px;
	letter-spacing: .1em;
	text-transform: uppercase;
	color: var(--text);
	opacity: 0.6;
}

.card-item h2{
	margin: 0 0 12px;
	font-size: clamp(22px, 2.2vw, 28px);
	line-height: 1.15;
	letter-spacing: -.01em;
	color: var(--text-strong);
}

.card-summary{
	font-size: 16px;
	margin: 0 0 16px;
}

/* Progressive reveal */
.card-details{
	max-height: 0;
	overflow: hidden;
	transition: max-height .4s ease, opacity .3s ease;
	opacity: 0;
}

.card-details.open{
	opacity: 1;
}

.card-details p{
	font-size: 15px;
	margin: 0 0 16px;
}

.card-details p:last-child{
	margin-bottom: 0;
}

.expand-btn{
	font-family: inherit;
	font-size: 13px;
	font-weight: 600;
	letter-spacing: .04em;
	color: var(--accent);
	background: none;
	border: none;
	padding: 0;
	cursor: pointer;
	border-bottom: 1px solid var(--accent);
	transition: opacity .2s ease;
}

.expand-btn:hover{
	opacity: 0.7;
}

/* PDF download */
.card-pdf-wrap{
	margin-top: 12px;
}

.card-pdf{
	display: inline-flex;
	align-items: center;
	gap: 6px;
	font-size: 14px;
	font-weight: 600;
	color: var(--text-strong);
	text-decoration: none;
	border-bottom: 1px solid var(--border);
	padding-bottom: 2px;
	transition: color .2s ease, border-color .2s ease;
}

.card-pdf:hover{
	color: var(--accent);
	border-color: var(--accent);
}

/* Video */
.card-video{
	width: 100%;
	border-radius: calc(var(--radius) - 4px);
	overflow: hidden;
	margin-bottom: 16px;
	background: #000;
}

.card-video video{
	width: 100%;
	height: auto;
	display: block;
}

/* Tags */
.card-tags{
	display: flex;
	flex-wrap: wrap;
	gap: 6px;
	margin-top: 16px;
}

.tag{
	font-size: 11px;
	letter-spacing: .06em;
	text-transform: uppercase;
	color: var(--accent);
	background: rgba(197,113,84,.08);
	border: 1px solid rgba(197,113,84,.2);
	border-radius: 999px;
	padding: 3px 10px;
}

/* Empty state */
.empty-state{
	grid-column: 1 / -1;
	text-align: center;
	padding: 48px 24px;
	color: var(--text);
	font-size: 15px;
}

/* Responsive */
@media (max-width: 740px){
	.card-grid{ grid-template-columns: 1fr; }
	.card-item{ padding: 22px; }
}

@media (max-width: 560px){
	.filter-bar{ gap: 6px; }
	.filter-btn{ font-size: 12px; padding: 6px 14px; }
}

@media (prefers-reduced-motion: reduce){
	.card-item{ opacity: 1; transform: none; transition: none; }
}