/*
 * Phase E Learn discovery and article experience.
 *
 * This stylesheet is route-owned and loaded only by the Learn hub, Learn topic
 * archives, and Learn articles. It builds on visual-system.css without changing
 * the frozen homepage or Phase D conversion pages.
 */

.td-learn {
    --td-learn-paper: #f1eee6;
    --td-learn-paper-strong: #faf8f2;
    --td-learn-ink: #172027;
    --td-learn-ink-soft: #4d5a62;
    --td-learn-paper-line: #cdd0ca;
    --td-learn-context-soft: #a9c0ce;
    min-width: 0;
    overflow: clip;
    background: var(--td-vs-night);
    color: var(--td-vs-document);
}

.td-learn *,
.td-learn *::before,
.td-learn *::after {
    box-sizing: border-box;
}

.td-learn :where(h1, h2, h3, h4, p, ol, ul, dl, figure, blockquote) {
    margin-block-start: 0;
}

.td-learn :where(a, button, summary):focus-visible {
    outline: 2px solid var(--td-vs-document);
    outline-offset: 4px;
    box-shadow: var(--td-vs-focus);
}

.td-learn :where(img, video, iframe, svg) {
    max-width: 100%;
}

.td-learn-kicker,
.td-learn-meta-label {
    margin: 0 0 0.75rem;
    color: var(--td-vs-context);
    font-family: var(--td-vs-font-mono);
    font-size: 0.6875rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    line-height: 1.4;
    text-transform: uppercase;
}

a.td-learn-kicker {
    display: inline-flex;
    min-height: 44px;
    align-items: center;
    text-decoration: underline;
    text-decoration-thickness: 1px;
    text-underline-offset: 0.3em;
}

.td-learn-boundary {
    max-width: 70ch;
    margin: 1.5rem 0 0;
    padding: 0.9rem 1rem;
    border-block: 1px solid var(--td-vs-line);
    color: var(--td-vs-slate-strong);
    font-size: 0.8125rem;
    line-height: 1.6;
}

.td-learn-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-block-start: 1.5rem;
}

/* Breadcrumbs */
.td-learn-breadcrumb {
    margin-block-end: clamp(2rem, 5vw, 4rem);
}

.td-learn-breadcrumb ol {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem 0.7rem;
    align-items: center;
    margin: 0;
    padding: 0;
    list-style: none;
}

.td-learn-breadcrumb li {
    display: inline-flex;
    gap: 0.7rem;
    align-items: center;
    min-width: 0;
    color: var(--td-vs-slate);
    font-family: var(--td-vs-font-mono);
    font-size: 0.6875rem;
    line-height: 1.5;
}

.td-learn-breadcrumb li + li::before {
    content: "/";
    color: var(--td-vs-line-strong);
}

.td-learn-breadcrumb a {
    display: inline-flex;
    min-height: 44px;
    align-items: center;
    color: var(--td-vs-slate-strong);
    text-decoration: none;
}

.td-learn-breadcrumb a:hover {
    color: var(--td-vs-document);
    text-decoration: underline;
    text-underline-offset: 0.25em;
}

/* Hub hero */
.td-learn-hero {
    position: relative;
    padding-block: clamp(2.5rem, 7vw, 7rem);
    border-block-end: 1px solid var(--td-vs-line);
    background:
        linear-gradient(120deg, rgba(106, 137, 154, 0.08), transparent 42%),
        var(--td-vs-night);
}

.td-learn-hero::after {
    content: "";
    position: absolute;
    inset: auto 0 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--td-vs-context), transparent);
    opacity: 0.5;
}

.td-learn-hero__layout {
    display: grid;
    grid-template-columns: minmax(0, 1.35fr) minmax(19rem, 0.65fr);
    gap: clamp(2.5rem, 7vw, 7rem);
    align-items: end;
}

.td-learn-hero__copy h1 {
    max-width: 13ch;
    margin: 0;
    color: var(--td-vs-document);
    font-family: var(--td-vs-font-sans);
    font-size: clamp(2.65rem, 6vw, 5.8rem);
    font-weight: 600;
    letter-spacing: -0.055em;
    line-height: 0.98;
    text-wrap: balance;
}

.td-learn-hero__dek {
    max-width: 68ch;
    margin: 1.5rem 0 0;
    color: var(--td-vs-slate-strong);
    font-size: clamp(1rem, 1.5vw, 1.175rem);
    line-height: 1.7;
}

.td-learn-hero__guide {
    min-width: 0;
    padding-block: 1.25rem;
    border-block: 1px solid var(--td-vs-line-strong);
}

.td-learn-hero__guide h2 {
    margin: 0 0 1.25rem;
    color: var(--td-vs-document);
    font-family: var(--td-vs-font-sans);
    font-size: clamp(1.35rem, 2vw, 1.8rem);
    font-weight: 600;
    letter-spacing: -0.025em;
}

.td-learn-hero__guide ol {
    margin: 0;
    padding: 0;
    border-block-start: 1px solid var(--td-vs-line);
    list-style: none;
}

.td-learn-hero__guide li {
    display: grid;
    grid-template-columns: 2rem minmax(0, 0.7fr) minmax(0, 1.3fr);
    gap: 0.75rem;
    align-items: baseline;
    padding-block: 0.8rem;
    border-block-end: 1px solid var(--td-vs-line-soft);
}

.td-learn-hero__guide li span {
    color: var(--td-vs-context);
    font-family: var(--td-vs-font-mono);
    font-size: 0.6875rem;
}

.td-learn-hero__guide li strong {
    color: var(--td-vs-document);
    font-size: 0.8125rem;
    font-weight: 650;
}

.td-learn-hero__guide li small {
    color: var(--td-vs-slate);
    font-size: 0.75rem;
    line-height: 1.4;
}

.td-learn-hero__guide > p:last-child {
    margin: 1rem 0 0;
    color: var(--td-vs-slate-strong);
    font-size: 0.75rem;
    line-height: 1.5;
}

/* Shared section composition */
.td-learn-block {
    padding-block: clamp(4rem, 9vw, 8rem);
}

.td-learn-block + .td-learn-block {
    border-block-start: 1px solid var(--td-vs-line-soft);
}

.td-learn-start,
.td-learn-desk {
    background: var(--td-vs-night-ledger);
}

.td-learn-featured {
    background: var(--td-vs-night);
}

.td-learn-topics {
    background: var(--td-vs-carbon);
}

.td-learn-section-head {
    display: grid;
    grid-template-columns: minmax(0, 1.35fr) minmax(16rem, 0.65fr);
    gap: clamp(1.5rem, 5vw, 5rem);
    align-items: end;
    margin-block-end: clamp(2rem, 5vw, 4rem);
}

.td-learn-section-head h2 {
    max-width: 21ch;
    margin: 0;
    color: var(--td-vs-document);
    font-family: var(--td-vs-font-sans);
    font-size: clamp(2rem, 4vw, 3.6rem);
    font-weight: 600;
    letter-spacing: -0.045em;
    line-height: 1.03;
    text-wrap: balance;
}

.td-learn-section-head > p {
    max-width: 52ch;
    margin: 0;
    color: var(--td-vs-slate-strong);
    font-size: 0.9375rem;
    line-height: 1.65;
}

/* Article summary component */
.td-learn-card {
    min-width: 0;
}

.td-learn-card__media {
    display: block;
    min-height: 0;
    overflow: hidden;
    border: 1px solid var(--td-vs-line);
    background: var(--td-vs-night-ledger);
}

.td-learn-card__image {
    display: block;
    width: 100%;
    height: 100%;
    aspect-ratio: 16 / 9;
    object-fit: cover;
}

.td-learn-card__body {
    min-width: 0;
}

.td-learn-card__meta {
    display: flex;
    flex-wrap: wrap;
    gap: 0.45rem 0.8rem;
    align-items: center;
    margin-block-end: 0.8rem;
    color: var(--td-vs-slate);
    font-family: var(--td-vs-font-mono);
    font-size: 0.625rem;
    letter-spacing: 0.04em;
    line-height: 1.4;
    text-transform: uppercase;
}

.td-learn-card__sequence {
    color: var(--td-vs-context);
    font-size: 0.75rem;
    font-weight: 700;
}

.td-learn-card__topics {
    display: flex;
    flex-wrap: wrap;
    gap: 0.35rem 0.6rem;
    margin: 0;
    padding: 0;
    list-style: none;
}

.td-learn-card__topics a {
    display: inline-flex;
    min-height: 32px;
    align-items: center;
    color: var(--td-learn-context-soft);
    text-decoration: underline;
    text-decoration-color: rgba(139, 168, 184, 0.45);
    text-underline-offset: 0.25em;
}

.td-learn-card__topics a:hover {
    color: var(--td-vs-document);
}

.td-learn-card__title {
    margin: 0;
    color: var(--td-vs-document);
    font-family: var(--td-vs-font-sans);
    font-size: clamp(1.2rem, 2vw, 1.65rem);
    font-weight: 600;
    letter-spacing: -0.025em;
    line-height: 1.18;
}

.td-learn-card__title a {
    color: inherit;
    text-decoration: none;
}

.td-learn-card__title a:hover {
    color: var(--td-learn-context-soft);
    text-decoration: underline;
    text-decoration-thickness: 1px;
    text-underline-offset: 0.2em;
}

.td-learn-card__summary {
    margin: 0.75rem 0 0;
    color: var(--td-vs-slate-strong);
    font-size: 0.875rem;
    line-height: 1.65;
}

.td-learn-card__link {
    display: inline-flex;
    min-height: 44px;
    align-items: center;
    margin-block-start: 0.8rem;
    color: var(--td-vs-document);
    font-size: 0.8125rem;
    font-weight: 650;
    text-decoration: underline;
    text-decoration-color: var(--td-vs-context);
    text-decoration-thickness: 1px;
    text-underline-offset: 0.3em;
}

.td-learn-card__link:hover {
    color: var(--td-learn-context-soft);
}

/* Start Here: ordered learning rail */
.td-learn-start__sequence {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: clamp(1.25rem, 3vw, 2.5rem);
    counter-reset: learn-start;
}

.td-learn-card--start {
    position: relative;
    padding-block-start: 1.5rem;
    border-block-start: 2px solid var(--td-vs-line-strong);
}

.td-learn-card--start:first-child {
    border-block-start-color: var(--td-vs-context);
}

.td-learn-card--start::before {
    content: "";
    position: absolute;
    inset: -0.35rem auto auto 0;
    width: 0.65rem;
    height: 0.65rem;
    border: 2px solid var(--td-vs-night-ledger);
    border-radius: 50%;
    background: var(--td-vs-line-strong);
}

.td-learn-card--start:first-child::before {
    background: var(--td-vs-context);
}

.td-learn-card--start .td-learn-card__title {
    font-size: clamp(1.35rem, 2.25vw, 1.9rem);
}

/* Featured: asymmetric editorial field */
.td-learn-featured__grid {
    display: grid;
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: 1rem;
}

.td-learn-card--lead,
.td-learn-card--card {
    padding: clamp(1.1rem, 2vw, 1.5rem);
    border: 1px solid var(--td-vs-line);
    border-radius: var(--td-vs-radius-md);
    background: var(--td-vs-carbon);
}

.td-learn-card--lead {
    grid-column: span 7;
    grid-row: span 2;
    display: grid;
    align-content: end;
    min-height: 27rem;
    border-block-start: 3px solid var(--td-vs-context);
    background:
        linear-gradient(150deg, rgba(106, 137, 154, 0.12), transparent 55%),
        var(--td-vs-carbon);
}

.td-learn-card--lead:has(.td-learn-card__media) {
    align-content: stretch;
    grid-template-rows: minmax(12rem, 1fr) auto;
    gap: 1.5rem;
}

.td-learn-card--lead .td-learn-card__title {
    max-width: 16ch;
    font-size: clamp(2rem, 4vw, 3.35rem);
    letter-spacing: -0.045em;
    line-height: 1.02;
}

.td-learn-card--card {
    grid-column: span 5;
    min-height: 13rem;
}

.td-learn-card--card:nth-child(n + 4) {
    grid-column: span 4;
}

/* Topic map: an index, not a card grid */
.td-learn-topic-index {
    margin: 0;
    padding: 0;
    border-block-start: 1px solid var(--td-vs-line-strong);
    list-style: none;
}

.td-learn-topic-index > li {
    display: grid;
    grid-template-columns: 3rem minmax(0, 1.3fr) minmax(13rem, 0.7fr) auto;
    gap: clamp(1rem, 3vw, 2rem);
    align-items: center;
    padding-block: clamp(1.35rem, 3vw, 2.25rem);
    border-block-end: 1px solid var(--td-vs-line);
}

.td-learn-topic-index__number {
    align-self: start;
    color: var(--td-vs-context);
    font-family: var(--td-vs-font-mono);
    font-size: 0.75rem;
    font-weight: 700;
}

.td-learn-topic-index h3 {
    margin: 0;
    color: var(--td-vs-document);
    font-family: var(--td-vs-font-sans);
    font-size: clamp(1.25rem, 2.4vw, 2rem);
    font-weight: 600;
    letter-spacing: -0.025em;
}

.td-learn-topic-index h3 a {
    color: inherit;
    text-decoration: none;
}

.td-learn-topic-index h3 a:hover {
    color: var(--td-learn-context-soft);
    text-decoration: underline;
    text-underline-offset: 0.2em;
}

.td-learn-topic-index h3 + p {
    max-width: 68ch;
    margin: 0.65rem 0 0;
    color: var(--td-vs-slate-strong);
    font-size: 0.875rem;
    line-height: 1.65;
}

.td-learn-topic-index dl {
    display: grid;
    gap: 0.75rem;
    margin: 0;
}

.td-learn-topic-index dt {
    margin-block-end: 0.15rem;
    color: var(--td-vs-slate);
    font-family: var(--td-vs-font-mono);
    font-size: 0.625rem;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.td-learn-topic-index dd {
    margin: 0;
    color: var(--td-vs-document);
    font-size: 0.8125rem;
    line-height: 1.45;
}

.td-learn-topic-index__link {
    display: inline-flex;
    min-height: 44px;
    align-items: center;
    justify-content: flex-end;
    color: var(--td-vs-document);
    font-size: 0.8125rem;
    font-weight: 650;
    text-align: end;
    text-decoration: underline;
    text-decoration-color: var(--td-vs-context);
    text-underline-offset: 0.3em;
}

/* Learn Desk and topic archive rows */
.td-learn-desk__list,
.td-learn-archive-list {
    border-block-start: 1px solid var(--td-vs-line-strong);
}

.td-learn-card--row {
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    gap: clamp(1.25rem, 4vw, 3rem);
    padding-block: clamp(1.5rem, 4vw, 2.75rem);
    border-block-end: 1px solid var(--td-vs-line);
}

.td-learn-card--row:has(.td-learn-card__media) {
    grid-template-columns: minmax(12rem, 0.38fr) minmax(0, 0.62fr);
    align-items: center;
}

.td-learn-card--row .td-learn-card__title {
    max-width: 30ch;
    font-size: clamp(1.45rem, 2.8vw, 2.35rem);
}

.td-learn-card--row .td-learn-card__summary {
    max-width: 72ch;
}

/* Pagination */
.td-learn-pagination {
    margin-block-start: clamp(2rem, 5vw, 4rem);
}

.td-learn-pagination .page-numbers {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin: 0;
    padding: 0;
    list-style: none;
}

.td-learn-pagination .page-numbers li {
    margin: 0;
}

.td-learn-pagination a,
.td-learn-pagination span {
    display: inline-flex;
    min-width: 44px;
    min-height: 44px;
    align-items: center;
    justify-content: center;
    padding: 0.6rem 0.8rem;
    border: 1px solid var(--td-vs-line-strong);
    border-radius: 0.35rem;
    color: var(--td-vs-document);
    font-family: var(--td-vs-font-mono);
    font-size: 0.75rem;
    font-weight: 650;
    text-decoration: none;
}

.td-learn-pagination a:hover {
    border-color: var(--td-vs-context);
    background: rgba(106, 137, 154, 0.1);
}

.td-learn-pagination .current {
    border-color: var(--td-vs-context);
    background: var(--td-vs-context);
    color: var(--td-vs-night);
}

/* Empty states */
.td-learn-empty-state {
    max-width: 50rem;
    padding: clamp(1.25rem, 4vw, 2.25rem);
    border: 1px solid var(--td-vs-line);
    border-block-start: 3px solid var(--td-vs-line-strong);
    border-radius: var(--td-vs-radius-md);
    background: var(--td-vs-night-ledger);
}

.td-learn-empty-state h3 {
    margin: 0;
    color: var(--td-vs-document);
    font-family: var(--td-vs-font-sans);
    font-size: clamp(1.35rem, 3vw, 2rem);
    font-weight: 600;
}

.td-learn-empty-state h3 + p {
    max-width: 62ch;
    margin: 0.8rem 0 0;
    color: var(--td-vs-slate-strong);
    line-height: 1.65;
}

.td-learn-empty-state .td-vs-button {
    margin-block-start: 1rem;
}

/* Owned transition and recovery */
.td-learn-transition,
.td-learn-route-footer {
    padding-block: clamp(3rem, 7vw, 6rem);
    border-block-start: 1px solid var(--td-vs-line);
    background: var(--td-vs-night);
}

.td-learn-route-footer {
    padding-block-start: 0;
    border-block-start: 0;
}

/* Paginated hub header */
.td-learn-page-header {
    padding-block: clamp(2.5rem, 7vw, 6rem);
    border-block-end: 1px solid var(--td-vs-line);
    background: var(--td-vs-night-ledger);
}

.td-learn-page-header h1 {
    max-width: 20ch;
    margin: 0;
    color: var(--td-vs-document);
    font-family: var(--td-vs-font-sans);
    font-size: clamp(2.3rem, 5vw, 4.5rem);
    font-weight: 600;
    letter-spacing: -0.05em;
    line-height: 1;
}

.td-learn-page-header h1 + p {
    max-width: 65ch;
    margin: 1.25rem 0 0;
    color: var(--td-vs-slate-strong);
    line-height: 1.65;
}

/* Topic archive */
.td-learn-topic-hero {
    padding-block: clamp(2.5rem, 7vw, 6.5rem);
    border-block-end: 1px solid var(--td-vs-line);
    background:
        linear-gradient(135deg, rgba(106, 137, 154, 0.08), transparent 45%),
        var(--td-vs-night-ledger);
}

.td-learn-topic-hero__layout {
    display: grid;
    grid-template-columns: minmax(0, 1.35fr) minmax(18rem, 0.65fr);
    gap: clamp(2rem, 7vw, 6rem);
    align-items: end;
}

.td-learn-topic-hero h1 {
    max-width: 14ch;
    margin: 0;
    color: var(--td-vs-document);
    font-family: var(--td-vs-font-sans);
    font-size: clamp(2.7rem, 6vw, 5.5rem);
    font-weight: 600;
    letter-spacing: -0.055em;
    line-height: 0.98;
    overflow-wrap: anywhere;
}

.td-learn-topic-hero__dek {
    max-width: 68ch;
    margin: 1.25rem 0 0;
    color: var(--td-vs-slate-strong);
    font-size: clamp(1rem, 1.5vw, 1.15rem);
    line-height: 1.7;
}

.td-learn-topic-hero__context {
    padding-block: 1.25rem;
    border-block: 1px solid var(--td-vs-line-strong);
}

.td-learn-topic-hero__context > p:not(.td-learn-meta-label) {
    margin: 0 0 1rem;
    color: var(--td-vs-slate-strong);
    font-size: 0.875rem;
    line-height: 1.6;
}

.td-learn-topic-hero__context > p:nth-of-type(2) {
    color: var(--td-vs-document);
    font-weight: 600;
}

.td-learn-topic-hero__context a {
    display: inline-flex;
    min-height: 44px;
    align-items: center;
    color: var(--td-vs-document);
    font-size: 0.8125rem;
    font-weight: 650;
    text-decoration: underline;
    text-decoration-color: var(--td-vs-context);
    text-underline-offset: 0.3em;
}

.td-learn-topic-results {
    padding-block: clamp(4rem, 9vw, 8rem);
    background: var(--td-vs-night);
}

.td-learn-related-topics {
    margin-block-start: clamp(2.5rem, 6vw, 5rem);
    padding-block-start: 1.5rem;
    border-block-start: 1px solid var(--td-vs-line);
}

.td-learn-related-topics ul {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem 1.25rem;
    margin: 0;
    padding: 0;
    list-style: none;
}

.td-learn-related-topics a {
    display: inline-flex;
    min-height: 44px;
    align-items: center;
    color: var(--td-vs-document);
    font-size: 0.875rem;
    text-decoration: underline;
    text-decoration-color: var(--td-vs-context);
    text-underline-offset: 0.3em;
}

/* Article header */
.td-learn-reading-shell {
    max-width: 68rem;
}

.td-learn-article-hero {
    padding-block: clamp(2.5rem, 7vw, 7rem);
    border-block-end: 1px solid var(--td-vs-line);
    background:
        linear-gradient(135deg, rgba(106, 137, 154, 0.08), transparent 48%),
        var(--td-vs-night);
}

.td-learn-article-hero__label-row {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    align-items: center;
    justify-content: space-between;
    margin-block-end: 1rem;
}

.td-learn-article-hero__label-row .td-learn-kicker {
    margin: 0;
}

.td-learn-back-link {
    display: inline-flex;
    min-height: 44px;
    align-items: center;
    color: var(--td-vs-slate-strong);
    font-size: 0.8125rem;
    font-weight: 600;
    text-decoration: underline;
    text-decoration-color: var(--td-vs-context);
    text-underline-offset: 0.3em;
}

.td-learn-article-hero h1 {
    max-width: 17ch;
    margin: 0;
    color: var(--td-vs-document);
    font-family: var(--td-vs-font-sans);
    font-size: clamp(2.7rem, 7vw, 6.3rem);
    font-weight: 600;
    letter-spacing: -0.06em;
    line-height: 0.97;
    overflow-wrap: anywhere;
    text-wrap: balance;
}

.td-learn-article-hero__dek {
    max-width: 65ch;
    margin: 1.5rem 0 0;
    color: var(--td-vs-slate-strong);
    font-size: clamp(1.05rem, 2vw, 1.3rem);
    line-height: 1.65;
}

.td-learn-article-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 1px;
    margin: 2rem 0 0;
    border: 1px solid var(--td-vs-line);
    background: var(--td-vs-line);
}

.td-learn-article-meta > div {
    flex: 1 1 12rem;
    min-width: 0;
    padding: 0.9rem 1rem;
    background: var(--td-vs-night-ledger);
}

.td-learn-article-meta dt {
    margin: 0 0 0.3rem;
    color: var(--td-vs-slate);
    font-family: var(--td-vs-font-mono);
    font-size: 0.625rem;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.td-learn-article-meta dd {
    margin: 0;
    color: var(--td-vs-document);
    font-size: 0.8125rem;
    line-height: 1.45;
}

.td-learn-article-topics {
    display: flex;
    flex-wrap: wrap;
    gap: 0.65rem 1rem;
    align-items: center;
    margin-block-start: 1.25rem;
}

.td-learn-article-topics > span {
    color: var(--td-vs-slate);
    font-family: var(--td-vs-font-mono);
    font-size: 0.625rem;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.td-learn-article-topics ul {
    display: flex;
    flex-wrap: wrap;
    gap: 0.45rem;
    margin: 0;
    padding: 0;
    list-style: none;
}

.td-learn-article-topics a {
    display: inline-flex;
    min-height: 36px;
    align-items: center;
    padding: 0.35rem 0.65rem;
    border: 1px solid var(--td-vs-line-strong);
    border-radius: 999px;
    color: var(--td-vs-document);
    font-size: 0.75rem;
    text-decoration: none;
}

.td-learn-article-topics a:hover {
    border-color: var(--td-vs-context);
}

.td-learn-article-featured-media {
    margin: clamp(2rem, 5vw, 4rem) 0 0;
}

.td-learn-article-featured-media__image {
    display: block;
    width: 100%;
    height: auto;
    border: 1px solid var(--td-vs-line-strong);
    border-radius: var(--td-vs-radius-md);
}

/* Article paper */
.td-learn-article-paper {
    background: var(--td-learn-paper);
    color: var(--td-learn-ink);
}

.td-learn-article-paper .td-learn-reading-shell {
    padding-block: clamp(3.5rem, 8vw, 7rem);
}

.td-learn-article-body {
    width: min(100%, 47rem);
    margin-inline: auto;
    color: var(--td-learn-ink);
    font-family: var(--td-vs-font-sans);
    font-size: clamp(1.05rem, 1.4vw, 1.16rem);
    line-height: 1.78;
    overflow-wrap: anywhere;
}

.td-learn-article-body > *:first-child {
    margin-block-start: 0;
}

.td-learn-article-body > *:last-child {
    margin-block-end: 0;
}

.td-learn-article-body :where(p, li, dd) {
    color: var(--td-learn-ink);
}

.td-learn-article-body :where(p, ul, ol, blockquote, figure, table, pre) {
    margin-block: 0 1.5em;
}

.td-learn-article-body :where(h2, h3, h4) {
    color: var(--td-learn-ink);
    font-family: var(--td-vs-font-sans);
    font-weight: 650;
    letter-spacing: -0.035em;
    line-height: 1.15;
    scroll-margin-block-start: 6rem;
    text-wrap: balance;
}

.td-learn-article-body h2 {
    margin-block: 2.25em 0.7em;
    padding-block-start: 0.75em;
    border-block-start: 1px solid var(--td-learn-paper-line);
    font-size: clamp(1.75rem, 4vw, 2.65rem);
}

.td-learn-article-body h3 {
    margin-block: 1.8em 0.6em;
    font-size: clamp(1.4rem, 3vw, 1.9rem);
}

.td-learn-article-body h4 {
    margin-block: 1.6em 0.5em;
    font-size: 1.2rem;
}

.td-learn-article-body :where(ul, ol) {
    padding-inline-start: 1.4em;
}

.td-learn-article-body li + li {
    margin-block-start: 0.5em;
}

.td-learn-article-body a {
    color: #234f68;
    font-weight: 600;
    text-decoration: underline;
    text-decoration-thickness: 1px;
    text-underline-offset: 0.2em;
    overflow-wrap: anywhere;
}

.td-learn-article-body a:hover {
    color: #102e40;
    text-decoration-thickness: 2px;
}

.td-learn-article-body blockquote {
    padding: 0.25rem 0 0.25rem 1.5rem;
    border-inline-start: 3px solid #6a899a;
    color: #33444d;
    font-size: 1.1em;
}

.td-learn-article-body blockquote cite {
    display: block;
    margin-block-start: 0.75rem;
    color: var(--td-learn-ink-soft);
    font-size: 0.8em;
    font-style: normal;
}

.td-learn-article-body :where(figure, img) {
    max-width: 100%;
    height: auto;
}

.td-learn-article-body figcaption {
    margin-block-start: 0.65rem;
    color: var(--td-learn-ink-soft);
    font-size: 0.78em;
    line-height: 1.5;
}

.td-learn-article-body :where(.wp-block-table, .wp-block-embed, .wp-block-code) {
    max-width: 100%;
    overflow-x: auto;
    overscroll-behavior-inline: contain;
}

.td-learn-article-body table {
    width: 100%;
    min-width: 36rem;
    border-collapse: collapse;
    font-size: 0.88em;
}

.td-learn-article-body :where(th, td) {
    padding: 0.75rem;
    border: 1px solid var(--td-learn-paper-line);
    text-align: start;
    vertical-align: top;
}

.td-learn-article-body th {
    background: #e2e1db;
    font-weight: 700;
}

.td-learn-article-body :where(code, pre) {
    font-family: var(--td-vs-font-mono);
}

.td-learn-article-body code {
    padding: 0.12em 0.3em;
    border-radius: 0.2rem;
    background: #e2e1db;
    font-size: 0.88em;
}

.td-learn-article-body pre {
    max-width: 100%;
    padding: 1rem;
    overflow-x: auto;
    border-radius: 0.35rem;
    background: var(--td-learn-ink);
    color: var(--td-learn-paper-strong);
    font-size: 0.82em;
    line-height: 1.6;
    white-space: pre;
}

.td-learn-article-body pre code {
    padding: 0;
    background: transparent;
    color: inherit;
}

.td-learn-learning-note,
.td-learn-gate-context {
    width: min(100%, 55rem);
    margin: clamp(3rem, 7vw, 5rem) auto 0;
    padding: clamp(1.25rem, 4vw, 2rem);
    border: 1px solid var(--td-learn-paper-line);
    background: var(--td-learn-paper-strong);
    color: var(--td-learn-ink);
}

.td-learn-learning-note {
    border-block-start: 4px solid #6a899a;
}

.td-learn-learning-note .td-learn-meta-label,
.td-learn-gate-context .td-learn-meta-label {
    color: #536f7f;
}

.td-learn-learning-note h2,
.td-learn-gate-context h2 {
    margin: 0;
    color: var(--td-learn-ink);
    font-family: var(--td-vs-font-sans);
    font-size: clamp(1.4rem, 3vw, 2rem);
    font-weight: 650;
    letter-spacing: -0.03em;
}

.td-learn-learning-note h2 + p,
.td-learn-gate-context h2 + p {
    margin: 0.75rem 0 0;
    color: var(--td-learn-ink-soft);
    line-height: 1.7;
}

.td-learn-gate-context {
    display: grid;
    grid-template-columns: minmax(0, 1.2fr) minmax(15rem, 0.8fr);
    gap: clamp(1.5rem, 4vw, 3rem);
    align-items: end;
}

.td-learn-gate-context dl {
    display: grid;
    gap: 1rem;
    margin: 0;
}

.td-learn-gate-context dl > div {
    padding-block-start: 0.75rem;
    border-block-start: 1px solid var(--td-learn-paper-line);
}

.td-learn-gate-context dt {
    margin-block-end: 0.25rem;
    color: var(--td-learn-ink-soft);
    font-family: var(--td-vs-font-mono);
    font-size: 0.625rem;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.td-learn-gate-context dd {
    margin: 0;
    color: var(--td-learn-ink);
    font-weight: 650;
    line-height: 1.5;
}

/* Article footer */
.td-learn-article-footer {
    padding-block: clamp(4rem, 9vw, 8rem);
    background: var(--td-vs-night);
}

.td-learn-related-learning {
    margin-block-end: clamp(3rem, 7vw, 6rem);
}

.td-learn-related-learning__grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1rem;
}

.td-learn-card--related {
    padding: 1.2rem;
    border: 1px solid var(--td-vs-line);
    border-radius: var(--td-vs-radius-md);
    background: var(--td-vs-carbon);
}

.td-learn-card--related .td-learn-card__title {
    font-size: 1.15rem;
}

.td-learn-article-next {
    margin-block-start: clamp(3rem, 7vw, 6rem);
}

.td-learn-article-risk-note {
    display: flex;
    gap: 1rem 2rem;
    align-items: flex-start;
    justify-content: space-between;
    margin-block-start: 1.5rem;
    padding: 1rem;
    border: 1px solid var(--td-vs-line);
    color: var(--td-vs-slate);
    font-size: 0.75rem;
    line-height: 1.6;
}

.td-learn-article-risk-note p {
    max-width: 85ch;
    margin: 0;
}

.td-learn-article-risk-note a {
    display: inline-flex;
    flex: 0 0 auto;
    min-height: 44px;
    align-items: center;
    color: var(--td-vs-document);
    font-weight: 650;
    text-decoration: underline;
    text-decoration-color: var(--td-vs-context);
    text-underline-offset: 0.3em;
}

/* Responsive composition */
@media (max-width: 70rem) {
    .td-learn-hero__layout,
    .td-learn-topic-hero__layout {
        grid-template-columns: minmax(0, 1.15fr) minmax(17rem, 0.85fr);
        gap: 3rem;
    }

    .td-learn-topic-index > li {
        grid-template-columns: 2.5rem minmax(0, 1fr) minmax(12rem, 0.55fr);
    }

    .td-learn-topic-index__link {
        grid-column: 2 / -1;
        justify-content: flex-start;
    }
}

@media (max-width: 60rem) {
    .td-learn-hero__layout,
    .td-learn-topic-hero__layout,
    .td-learn-section-head,
    .td-learn-gate-context {
        grid-template-columns: 1fr;
        align-items: start;
    }

    .td-learn-hero__guide,
    .td-learn-topic-hero__context {
        max-width: 42rem;
    }

    .td-learn-featured__grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .td-learn-card--lead,
    .td-learn-card--card,
    .td-learn-card--card:nth-child(n + 4) {
        grid-column: auto;
    }

    .td-learn-card--lead {
        grid-column: 1 / -1;
        min-height: 22rem;
    }

    .td-learn-topic-index > li {
        grid-template-columns: 2.5rem minmax(0, 1fr);
    }

    .td-learn-topic-index dl,
    .td-learn-topic-index__link {
        grid-column: 2;
    }
}

@media (max-width: 48rem) {
    .td-learn .td-vs-container {
        width: min(var(--td-vs-container), calc(100% - 1.5rem));
    }

    .td-learn-start__sequence,
    .td-learn-related-learning__grid {
        grid-template-columns: 1fr;
    }

    .td-learn-card--start {
        min-height: 0;
    }

    .td-learn-card--row:has(.td-learn-card__media) {
        grid-template-columns: 1fr;
    }

    .td-learn-card--row .td-learn-card__media {
        max-width: 34rem;
    }

    .td-learn-article-risk-note {
        display: block;
    }

    .td-learn-article-risk-note a {
        margin-block-start: 0.75rem;
    }
}

@media (max-width: 35rem) {
    .td-learn-hero__copy h1,
    .td-learn-topic-hero h1,
    .td-learn-article-hero h1 {
        font-size: clamp(2.35rem, 12vw, 3.7rem);
    }

    .td-learn-hero__guide li {
        grid-template-columns: 1.8rem minmax(0, 1fr);
    }

    .td-learn-hero__guide li small {
        grid-column: 2;
    }

    .td-learn-actions,
    .td-learn-actions .td-vs-button {
        width: 100%;
    }

    .td-learn-featured__grid {
        grid-template-columns: 1fr;
    }

    .td-learn-card--lead {
        grid-column: auto;
        min-height: 20rem;
    }

    .td-learn-card--lead .td-learn-card__title {
        font-size: clamp(1.8rem, 9vw, 2.5rem);
    }

    .td-learn-topic-index > li {
        grid-template-columns: 1.8rem minmax(0, 1fr);
        gap: 0.75rem;
    }

    .td-learn-article-meta {
        display: grid;
        grid-template-columns: 1fr;
    }

    .td-learn-article-topics {
        align-items: flex-start;
    }

    .td-learn-article-body table {
        min-width: 32rem;
    }

    .td-learn-transition .td-cta-block__actions,
    .td-learn-transition .td-vs-button,
    .td-learn-article-next .td-cta-block__actions,
    .td-learn-article-next .td-vs-button {
        width: 100%;
    }
}

@media (prefers-reduced-motion: reduce) {
    .td-learn *,
    .td-learn *::before,
    .td-learn *::after {
        scroll-behavior: auto !important;
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

@media (forced-colors: active) {
    .td-learn-card--lead,
    .td-learn-card--card,
    .td-learn-card--related,
    .td-learn-empty-state,
    .td-learn-learning-note,
    .td-learn-gate-context,
    .td-learn-pagination a,
    .td-learn-pagination span {
        border-color: CanvasText;
        background: Canvas;
        color: CanvasText;
    }
}