/**
 * === Section 09 Knowledge Hub — 4 Free-Floating Mini Cards ===
 *
 * Mô tả: 4 cards floating trực tiếp trên canvas (không dùng card-on-canvas wrap).
 *        Grid 4-col desktop, 2×2 tablet, 1-col mobile.
 *        Card hover lift effect.
 *
 * Flow:
 *   1. .section-09-knowledge — max-width + margin-inline: auto
 *   2. .knowledge-cards — grid 4-col
 *   3. .knowledge-card — individual card với icon + title + excerpt + cta
 *   4. .knowledge-card__icon — 48px icon container màu brand-soft
 *   5. Hover: translateY(-4px) + shadow grow
 */

.section-09-knowledge {
	margin: 32px clamp(16px, 3vw, 48px);
	max-width: var(--container-wide);
	margin-inline: auto;
	padding-block: clamp(32px, 5vw, 64px);
}

.section-09-knowledge .section-header {
	text-align: center;
	margin-bottom: 40px;
}

.knowledge-cards {
	display: grid;
	grid-template-columns: repeat(4, 1fr);
	gap: 16px;
}

.knowledge-card {
	background: var(--color-surface);
	border-radius: 22px;
	padding: 28px;
	box-shadow: 0 12px 36px rgba(26, 43, 34, 0.06);
	transition: transform var(--motion-base) var(--ease-standard),
	            box-shadow var(--motion-base) var(--ease-standard);
	text-decoration: none;
	color: inherit;
	display: flex;
	flex-direction: column;
}

.knowledge-card:hover {
	transform: translateY(-4px) translateZ(0);
	box-shadow: 0 20px 48px rgba(26, 43, 34, 0.10);
}

.knowledge-card:focus-visible {
	outline: 2px solid var(--color-brand-secondary);
	outline-offset: 3px;
}

.knowledge-card__icon {
	width: 48px;
	height: 48px;
	border-radius: 12px;
	background: var(--color-brand-soft);
	color: var(--color-brand-primary);
	display: inline-flex;
	align-items: center;
	justify-content: center;
	margin-bottom: 16px;
	flex-shrink: 0;
}

.knowledge-card__title {
	font: var(--weight-bold) var(--text-h4) / var(--lh-heading) var(--font-primary);
	margin: 0 0 8px;
	color: var(--color-ink-strong);
	letter-spacing: var(--tracking-heading);
}

.knowledge-card__excerpt {
	font: var(--weight-regular) var(--text-body) / var(--lh-body) var(--font-primary);
	color: var(--color-ink-default);
	margin: 0 0 16px;
	flex: 1;
}

.knowledge-card__cta {
	color: var(--color-brand-primary);
	font: var(--weight-semibold) var(--text-caption) / var(--lh-snug) var(--font-primary);
	display: inline-flex;
	align-items: center;
	gap: 4px;
	align-self: flex-start;
}

.knowledge-card:hover .knowledge-card__cta {
	gap: 8px;
}

@media (max-width: 1023px) {
	.knowledge-cards {
		grid-template-columns: repeat(2, 1fr);
	}
}

@media (max-width: 540px) {
	.knowledge-cards {
		grid-template-columns: 1fr;
	}
}