/*
 * Knowledge section (Kiến thức / Góc Nếp Nhà) — dùng ở trang chủ (preview)
 * và /kien-thuc/ + single post. Đối chiếu react-analysis.md mục 4.8 / 6.
 */

.knowledge-section__head {
	display: flex;
	align-items: flex-end;
	justify-content: space-between;
	gap: 20px;
	margin-bottom: 40px;
}

.knowledge-section__link {
	display: none;
	font-size: 14px;
	font-weight: 700;
	color: var(--color-primary);
}

@media (min-width: 640px) {
	.knowledge-section__link { display: inline-flex; align-items: center; gap: 4px; }
}

.post-grid {
	display: grid;
	gap: 20px;
	grid-template-columns: repeat(1, minmax(0, 1fr));
}

@media (min-width: 768px) {
	.post-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

.post-grid__empty {
	grid-column: 1 / -1;
	text-align: center;
	padding: 64px 24px;
	border-radius: var(--radius-xl);
	border: 1px dashed var(--color-border-step);
	background: rgba(255, 255, 255, 0.5);
	color: var(--color-muted);
	font-size: 14px;
}

.post-card {
	display: block;
}

.post-card__media {
	height: 208px;
	border-radius: var(--radius-xl);
	overflow: hidden;
	margin-bottom: 20px;
}

.post-card__media img,
.post-card__media .nepnha-placeholder {
	width: 100%;
	height: 100%;
	object-fit: cover;
	transition: transform 0.7s ease;
}

.post-card:hover .post-card__media img {
	transform: scale(1.05);
}

.post-card__category {
	font-size: 10px;
	font-weight: 700;
	text-transform: uppercase;
	letter-spacing: 0.05em;
	color: var(--color-secondary);
}

.post-card__title {
	margin-top: 8px;
	font-size: 18px;
	font-weight: 700;
	line-height: 1.55;
	color: var(--color-text);
}

.post-card__meta {
	margin-top: 8px;
	font-size: 14px;
	color: var(--color-muted);
}

/* Single post ------------------------------------------------------------------- */
.single-post {
	max-width: 760px;
	margin: 0 auto;
}

.single-post__media {
	border-radius: var(--radius-28);
	overflow: hidden;
	margin-bottom: 32px;
}

.single-post__media img,
.single-post__media .nepnha-placeholder {
	width: 100%;
	height: 380px;
	object-fit: cover;
}

.single-post__title {
	font-size: 32px;
	margin-top: 16px;
}

.single-post__meta {
	margin-top: 12px;
	font-size: 14px;
	color: var(--color-muted);
}

.single-post__content {
	margin-top: 32px;
	font-size: 16px;
	line-height: 1.8;
	color: var(--color-text);
}

.single-post__content p {
	margin: 0 0 20px;
}

.single-post__back {
	display: inline-flex;
	align-items: center;
	gap: 6px;
	margin-bottom: 24px;
	font-size: 13px;
	font-weight: 700;
	color: var(--color-primary);
}