/**
 * Learn hub, articles, author pages, topic hubs, cornerstone page and the
 * Learn blocks (spec Part 11; design artboards 13 and 14).
 * Tokens only (tokens.css), logical properties only.
 *
 * Loaded on Learn pages by inc/learn.php and by Learn blocks elsewhere.
 */

/* ---------- Hub intro ---------- */

.pc-learn-intro {
	display: flex;
	flex-direction: column;
	gap: var(--space-3);
	margin-block: 0 var(--space-5);
	padding-block-start: var(--space-6);
}

.pc-learn-intro__tag {
	margin: 0;
	background-color: var(--color-accent-tint);
	color: var(--color-ink);
	font-weight: 700;
}

.pc-learn-intro h1,
.pc-learn-intro__title {
	margin: 0;
	font-family: var(--font-heading);
	font-size: var(--font-size-hero);
	line-height: var(--line-height-hero);
	letter-spacing: var(--letter-spacing-hero);
	color: var(--color-ink);
}

.pc-learn-intro__text,
.pc-learn-intro__content p,
.pc-learn-intro .pc-archive__intro {
	max-inline-size: 60ch;
	margin: 0;
	color: var(--color-ink-muted);
	font-size: var(--font-size-body);
	line-height: var(--line-height-body);
}

.pc-learn-intro__content {
	display: flex;
	flex-direction: column;
	gap: var(--space-3);
}

/* ---------- Filters ---------- */

.pc-learn-filters {
	display: flex;
	align-items: center;
	gap: var(--space-3);
	margin-block-end: var(--space-6);
	overflow-x: auto;
	scrollbar-width: none;
	padding-block: var(--space-1);
	padding-inline: var(--space-1);
	margin-inline: calc(var(--space-1) * -1);
}

.pc-learn-filters::-webkit-scrollbar {
	display: none;
}

.pc-learn-filters__group {
	display: flex;
	flex-wrap: nowrap;
	gap: var(--space-2);
	margin: 0;
	padding: 0;
	list-style: none;
}

.pc-learn-filters__divider {
	flex: none;
	inline-size: 1px;
	block-size: var(--space-6);
	background-color: var(--color-line);
}

.pc-chip {
	display: inline-flex;
	align-items: center;
	min-block-size: 40px;
	padding-block: var(--space-2);
	padding-inline: var(--space-4);
	border: 1px solid var(--color-line);
	border-radius: var(--radius-pill);
	background-color: var(--color-card);
	color: var(--color-ink);
	font-size: var(--font-size-small);
	line-height: var(--line-height-small);
	font-weight: 600;
	white-space: nowrap;
	text-decoration: none;
	transition: background-color var(--motion-fast), border-color var(--motion-fast);
}

.pc-chip:hover {
	border-color: var(--color-ink);
}

.pc-chip:focus-visible {
	outline: none;
	box-shadow: var(--focus-ring);
}

.pc-chip.is-active {
	border-color: var(--color-trust);
	background-color: var(--color-trust);
	color: var(--color-on-dark);
}

/* ---------- Article cards ---------- */

.pc-article-list {
	display: grid;
	gap: var(--space-5);
	margin: 0;
	padding: 0;
	list-style: none;
}

.pc-article-list > li {
	display: flex;
}

@media (min-width: 600px) {
	.pc-article-list--card {
		grid-template-columns: repeat(2, minmax(0, 1fr));
	}
}

@media (min-width: 960px) {
	.pc-article-list--card {
		grid-template-columns: repeat(3, minmax(0, 1fr));
	}

	.pc-article-list--row {
		grid-template-columns: repeat(2, minmax(0, 1fr));
	}
}

.pc-article-card {
	position: relative;
	display: flex;
	flex-direction: column;
	inline-size: 100%;
	overflow: hidden;
	border: 1px solid var(--color-line);
	border-radius: var(--radius-card);
	background-color: var(--color-card);
	transition: box-shadow var(--motion-fast);
}

.pc-article-card:hover {
	box-shadow: var(--shadow-soft);
}

.pc-article-card:focus-within {
	box-shadow: var(--focus-ring);
}

.pc-article-card__media {
	aspect-ratio: 16 / 10;
	background-color: var(--color-surface);
	overflow: hidden;
}

.pc-article-card__img,
.pc-article-card__media img {
	display: block;
	inline-size: 100%;
	block-size: 100%;
	object-fit: cover;
}

.pc-article-card__placeholder {
	display: block;
	inline-size: 100%;
	block-size: 100%;
	background-image: repeating-linear-gradient(-45deg, var(--color-surface) 0 14px, var(--color-card) 14px 28px);
}

.pc-article-card__body {
	display: flex;
	flex-direction: column;
	gap: var(--space-2);
	padding: var(--space-4) var(--space-4) var(--space-5);
}

.pc-article-card__tags,
.pc-article-tags {
	display: flex;
	flex-wrap: wrap;
	align-items: center;
	gap: var(--space-2);
	margin: 0;
}

.pc-tag--audience {
	background-color: var(--color-nurture-tint);
	color: var(--color-ink);
	font-weight: 700;
	text-decoration: none;
}

.pc-article-card__value,
.pc-article-tags__value {
	color: var(--color-ink-muted);
	font-size: var(--font-size-small);
	line-height: var(--line-height-small);
	font-weight: 600;
}

.pc-article-tags__value {
	text-decoration: none;
}

.pc-article-tags__value:hover {
	text-decoration: underline;
	text-decoration-color: var(--color-accent);
}

.pc-article-card__title {
	margin: 0;
	font-family: var(--font-heading);
	font-size: var(--font-size-h3);
	line-height: var(--line-height-h3);
	color: var(--color-ink);
}

.pc-article-card__link {
	color: inherit;
	text-decoration: none;
}

.pc-article-card__link:focus-visible {
	outline: none;
}

.pc-article-card__link--stretched::after {
	content: "";
	position: absolute;
	inset: 0;
}

.pc-article-card__meta,
.pc-article-meta {
	display: flex;
	flex-wrap: wrap;
	align-items: center;
	gap: var(--space-1) var(--space-2);
	margin: 0;
	color: var(--color-ink-muted);
	font-size: var(--font-size-small);
	line-height: var(--line-height-small);
}

.pc-article-card__meta > span,
.pc-article-meta > span {
	display: inline-flex;
	align-items: center;
	gap: var(--space-1);
}

.pc-article-card__icon {
	flex: none;
}

.pc-article-card__excerpt {
	margin: 0;
	color: var(--color-ink-muted);
}

/* Row layout (homepage "From our educators"). */
.pc-article-card--row {
	flex-direction: row;
}

.pc-article-card--row .pc-article-card__media {
	flex: 0 0 36%;
	aspect-ratio: auto;
	min-block-size: 140px;
}

.pc-article-card--row .pc-article-card__body {
	justify-content: center;
	padding: var(--space-4) var(--space-5);
}

@media (max-width: 479px) {
	.pc-article-card--row {
		flex-direction: column;
	}

	.pc-article-card--row .pc-article-card__media {
		flex-basis: auto;
		aspect-ratio: 16 / 10;
	}
}

/* Featured. */
.pc-learn-featured {
	margin-block-end: var(--space-8);
}

.pc-article-card--featured {
	border-radius: var(--radius-panel);
}

.pc-article-card--featured .pc-article-card__body {
	gap: var(--space-3);
	padding: var(--space-5);
}

.pc-article-card--featured .pc-article-card__title {
	font-size: var(--font-size-h1);
	line-height: var(--line-height-h1);
}

.pc-article-card--featured .pc-article-card__link:hover {
	text-decoration: underline;
	text-decoration-color: var(--color-accent);
}

.pc-article-card__eyebrow {
	margin: 0;
	color: var(--color-ink-muted);
	text-transform: uppercase;
}

.pc-article-card__cta {
	margin: var(--space-2) 0 0;
}

@media (min-width: 900px) {
	.pc-article-card--featured {
		display: grid;
		grid-template-columns: 55% 1fr;
		align-items: center;
	}

	.pc-article-card--featured .pc-article-card__media {
		block-size: 100%;
		aspect-ratio: 4 / 3;
	}

	.pc-article-card--featured .pc-article-card__body {
		padding: var(--space-7);
	}
}

/* ---------- Grid section, empty state, pagination ---------- */

.pc-learn-grid {
	margin-block-end: var(--space-8);
}

.pc-learn-grid[aria-busy="true"] {
	opacity: 0.6;
	transition: opacity var(--motion-fast);
}

.pc-learn-grid__heading {
	margin-block: 0 var(--space-5);
	font-family: var(--font-heading);
	font-size: var(--font-size-h2);
	line-height: var(--line-height-h2);
}

.pc-learn-grid__heading:focus {
	outline: none;
}

.pc-learn-grid__empty {
	display: flex;
	flex-direction: column;
	gap: var(--space-3);
	padding: var(--space-6);
}

.pc-learn-grid__empty p {
	margin: 0;
}

.pc-learn-pager {
	margin-block-start: var(--space-6);
}

.pc-learn-pager__list {
	display: flex;
	flex-wrap: wrap;
	justify-content: center;
	gap: var(--space-2);
	margin: 0;
	padding: 0;
	list-style: none;
}

.pc-learn-pager .page-numbers {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	gap: var(--space-1);
	min-inline-size: 44px;
	min-block-size: 44px;
	padding-inline: var(--space-3);
	border: 1px solid var(--color-line);
	border-radius: var(--radius-pill);
	background-color: var(--color-card);
	color: var(--color-ink);
	font-weight: 600;
	text-decoration: none;
}

.pc-learn-pager .page-numbers.current {
	border-color: var(--color-trust);
	background-color: var(--color-trust);
	color: var(--color-on-dark);
}

.pc-learn-pager__arrow {
	display: inline-block;
}

[dir="rtl"] .pc-learn-pager__arrow,
[dir="rtl"] .pc-article-end__all .pc-icon--arrow {
	transform: scaleX(-1);
}

/* ---------- Article ---------- */

.pc-article__head {
	display: flex;
	flex-direction: column;
	gap: var(--space-4);
	margin-block: 0 var(--space-5);
	padding-block-start: var(--space-6);
}

.pc-article__title {
	margin: 0;
	font-family: var(--font-heading);
	font-size: var(--font-size-hero);
	line-height: var(--line-height-hero);
	letter-spacing: var(--letter-spacing-hero);
}

.pc-article__image {
	margin-block: 0 var(--space-6);
	overflow: hidden;
	border: 1px solid var(--color-line);
	border-radius: var(--radius-card);
	background-color: var(--color-surface);
}

.pc-article__image img {
	display: block;
	inline-size: 100%;
	block-size: 100%;
	object-fit: cover;
}

.pc-article__body {
	font-size: var(--font-size-body);
	line-height: 1.75;
}

.pc-article__body > * + * {
	margin-block-start: var(--space-4);
}

.pc-article__body h2 {
	margin-block-start: var(--space-7);
	font-size: var(--font-size-h2);
	line-height: var(--line-height-h2);
}

.pc-article__body h3 {
	margin-block-start: var(--space-6);
	font-size: var(--font-size-h3);
	line-height: var(--line-height-h3);
}

.pc-article__body a {
	color: var(--color-ink);
	font-weight: 600;
	text-decoration-line: underline;
	text-decoration-color: var(--color-accent);
	text-decoration-thickness: 2px;
	text-underline-offset: 4px;
}

.pc-article__body blockquote,
.pc-article__body .wp-block-quote {
	margin-inline: 0;
	padding-block: var(--space-1);
	padding-inline: var(--space-5) 0;
	border: 0;
	border-inline-start: 3px solid var(--color-accent);
	font-family: var(--font-heading);
	font-size: var(--font-size-h3);
	line-height: var(--line-height-h3);
	font-weight: 700;
}

.pc-article__body blockquote p {
	margin: 0;
}

.pc-article__body ul,
.pc-article__body ol {
	padding-inline-start: var(--space-5);
}

.pc-article__body li + li {
	margin-block-start: var(--space-2);
}

/* Single-language note. */
.pc-article-lang-note {
	display: flex;
	flex-wrap: wrap;
	gap: var(--space-1) var(--space-3);
	margin-block: var(--space-4) 0;
	padding: var(--space-3) var(--space-4);
	border-radius: var(--radius-input);
	background-color: var(--color-trust-tint);
	color: var(--color-ink);
	font-size: var(--font-size-small);
	line-height: var(--line-height-small);
}

.pc-article-lang-note a {
	color: var(--color-ink);
	font-weight: 600;
}

/* ---------- Author box ---------- */

.pc-author {
	display: flex;
	align-items: center;
	gap: var(--space-4);
	padding: var(--space-4) var(--space-5);
	border: 1px solid var(--color-line);
	border-radius: var(--radius-card);
	background-color: var(--color-card);
}

.pc-author__avatar {
	flex: none;
}

.pc-author__photo,
.pc-author__initials {
	display: flex;
	align-items: center;
	justify-content: center;
	inline-size: 56px;
	block-size: 56px;
	border-radius: var(--radius-round);
	background-color: var(--color-surface);
	color: var(--color-ink);
	font-family: var(--font-heading);
	font-weight: 700;
	object-fit: cover;
}

.pc-author__body {
	display: flex;
	flex-direction: column;
	gap: var(--space-1);
	min-inline-size: 0;
}

.pc-author__name {
	margin: 0;
	font-family: var(--font-heading);
	font-size: var(--font-size-h3);
	line-height: var(--line-height-h3);
	font-weight: 700;
}

.pc-author__name a {
	color: var(--color-ink);
	text-decoration: none;
}

.pc-author__name a:hover {
	text-decoration: underline;
	text-decoration-color: var(--color-accent);
}

.pc-author__job,
.pc-author__bio {
	margin: 0;
	color: var(--color-ink-muted);
	font-size: var(--font-size-small);
	line-height: var(--line-height-small);
}

.pc-author--profile {
	align-items: flex-start;
	gap: var(--space-5);
	margin-block: var(--space-6) var(--space-7);
	padding: var(--space-6);
	border-radius: var(--radius-panel);
}

.pc-author--profile .pc-author__photo,
.pc-author--profile .pc-author__initials {
	inline-size: 96px;
	block-size: 96px;
	font-size: var(--font-size-h2);
}

.pc-author--profile .pc-author__name {
	font-size: var(--font-size-h1);
	line-height: var(--line-height-h1);
}

.pc-author--profile .pc-author__bio {
	max-inline-size: 65ch;
	font-size: var(--font-size-body);
	line-height: var(--line-height-body);
}

.pc-author__cred-heading {
	margin: var(--space-3) 0 0;
	font-size: var(--font-size-h3);
	line-height: var(--line-height-h3);
}

.pc-author__creds {
	margin: 0;
	padding-inline-start: var(--space-5);
}

@media (max-width: 599px) {
	.pc-author--profile {
		flex-direction: column;
		padding: var(--space-5);
	}
}

/* ---------- Article end (L1) ---------- */

.pc-article-end {
	display: flex;
	flex-direction: column;
	gap: var(--space-5);
	margin-block: var(--space-7) var(--space-8);
}

.pc-article-end__card {
	display: grid;
	gap: var(--space-4);
	padding: var(--space-5);
	border-radius: var(--radius-card);
	background-color: var(--color-surface);
}

.pc-article-end__media {
	inline-size: 140px;
	aspect-ratio: 1;
	overflow: hidden;
	border-radius: var(--radius-input);
	background-color: var(--color-bg);
}

.pc-article-end__img {
	display: block;
	inline-size: 100%;
	block-size: 100%;
	object-fit: cover;
}

.pc-article-end__body {
	display: flex;
	flex-direction: column;
	gap: var(--space-1);
}

.pc-article-end__eyebrow {
	margin: 0;
	color: var(--color-ink-muted);
	text-transform: uppercase;
}

.pc-article-end__title {
	margin: 0;
	font-size: var(--font-size-h2);
	line-height: var(--line-height-h2);
}

.pc-article-end__line {
	margin: 0;
	color: var(--color-ink-muted);
	font-size: var(--font-size-small);
	line-height: var(--line-height-small);
}

.pc-article-end__cta {
	margin: 0;
}

.pc-article-end__cta .pc-btn {
	inline-size: 100%;
}

@media (min-width: 700px) {
	.pc-article-end__card {
		grid-template-columns: auto 1fr auto;
		align-items: center;
		gap: var(--space-5);
		padding: var(--space-6);
	}

	.pc-article-end__card:not(:has(.pc-article-end__media)) {
		grid-template-columns: 1fr auto;
	}

	.pc-article-end__media {
		inline-size: 200px;
	}

	.pc-article-end__cta {
		align-self: start;
	}

	.pc-article-end__cta .pc-btn {
		inline-size: auto;
	}
}

.pc-article-end__links {
	display: flex;
	flex-wrap: wrap;
	justify-content: space-between;
	gap: var(--space-3) var(--space-5);
}

/* ---------- Video (click to load) ---------- */

.pc-video {
	margin-inline: 0;
	margin-block: var(--space-6);
}

.pc-video__frame {
	position: relative;
	aspect-ratio: 16 / 9;
	overflow: hidden;
	border-radius: var(--radius-card);
	background-color: var(--color-trust);
}

.pc-video__thumb,
.pc-video__iframe {
	position: absolute;
	inset: 0;
	inline-size: 100%;
	block-size: 100%;
	border: 0;
	object-fit: cover;
}

.pc-video__play {
	position: absolute;
	inset-block-start: 50%;
	inset-inline-start: 50%;
	display: flex;
	align-items: center;
	justify-content: center;
	inline-size: 72px;
	block-size: 72px;
	border-radius: var(--radius-round);
	background-color: var(--color-trust);
	color: var(--color-on-dark);
	box-shadow: var(--shadow-soft);
	transform: translate(-50%, -50%);
	transition: transform var(--motion-fast);
}

[dir="rtl"] .pc-video__play {
	transform: translate(50%, -50%);
}

.pc-video__play:hover {
	transform: translate(-50%, -50%) scale(1.06);
}

[dir="rtl"] .pc-video__play:hover {
	transform: translate(50%, -50%) scale(1.06);
}

.pc-video__play:focus-visible {
	outline: none;
	box-shadow: var(--focus-ring);
}

.pc-video .pc-video__play,
.pc-video .pc-video__play:hover,
.pc-video .pc-video__play:visited {
	color: var(--color-on-dark);
}

.pc-video__play svg {
	margin-inline-start: 4px;
}

.pc-video__caption {
	display: flex;
	flex-direction: column;
	gap: var(--space-1);
	margin-block-start: var(--space-2);
	color: var(--color-ink-muted);
	font-size: var(--font-size-small);
	line-height: var(--line-height-small);
}

.pc-video__title {
	color: var(--color-ink);
	font-weight: 600;
}

/* ---------- Topic hubs and cornerstone page ---------- */

.pc-learn-topic,
.pc-cornerstone {
	display: flex;
	flex-direction: column;
	gap: var(--space-5);
	margin-block: var(--space-6) var(--space-8);
}

.pc-learn-topic h1,
.pc-cornerstone h1 {
	margin: 0;
	font-family: var(--font-heading);
	font-size: var(--font-size-hero);
	line-height: var(--line-height-hero);
	letter-spacing: var(--letter-spacing-hero);
}

.pc-learn-topic__intro,
.pc-cornerstone__lead {
	max-inline-size: 65ch;
	margin: 0;
	color: var(--color-ink-muted);
	font-size: var(--font-size-h3);
	line-height: var(--line-height-h3);
	font-weight: 400;
}

.pc-cornerstone > h2,
.pc-cornerstone__section > h2 {
	margin-block: var(--space-5) 0;
	font-size: var(--font-size-h2);
	line-height: var(--line-height-h2);
}

.pc-cornerstone p,
.pc-cornerstone li {
	max-inline-size: 70ch;
}

.pc-cornerstone__values {
	display: grid;
	gap: var(--space-4);
}

@media (min-width: 900px) {
	.pc-cornerstone__values {
		grid-template-columns: repeat(3, minmax(0, 1fr));
	}
}

.pc-cornerstone__value {
	display: flex;
	flex-direction: column;
	gap: var(--space-2);
	padding: var(--space-5);
	border: 1px solid var(--color-line);
	border-radius: var(--radius-card);
	background-color: var(--color-card);
}

.pc-cornerstone__value h3 {
	margin: 0;
	font-size: var(--font-size-h3);
	line-height: var(--line-height-h3);
}

.pc-cornerstone__value p {
	margin: 0;
}

.pc-learn-related {
	display: flex;
	flex-direction: column;
	gap: var(--space-3);
	padding: var(--space-5);
	border-radius: var(--radius-card);
	background-color: var(--color-surface);
}

.pc-learn-related h2 {
	margin: 0;
	font-size: var(--font-size-h3);
	line-height: var(--line-height-h3);
}

.pc-learn-related ul {
	display: flex;
	flex-direction: column;
	gap: var(--space-2);
	margin: 0;
	padding: 0;
	list-style: none;
}

.pc-learn-related a,
.pc-cornerstone a:not(.wp-block-button__link):not(.pc-btn) {
	color: var(--color-ink);
	font-weight: 600;
	text-decoration-line: underline;
	text-decoration-color: var(--color-accent);
	text-decoration-thickness: 2px;
	text-underline-offset: 4px;
}

/* Hub: the homepage section's two cards keep equal heights. */
.pc-latest-articles .pc-article-card {
	block-size: 100%;
}