/* QTube Learn — public knowledge hub */

.learn-body,
.learn-prose {
  --qtube-accent: var(--qtube-color-gold, #c9a227);
}

.learn-body {
  background:
    radial-gradient(1100px 480px at 6% -10%, color-mix(in srgb, var(--qtube-accent) 20%, transparent), transparent 58%),
    radial-gradient(820px 340px at 100% -8%, color-mix(in srgb, var(--qtube-red, #c1121f) 10%, transparent), transparent 52%),
    var(--qtube-bg);
}

.learn-shell {
  max-width: min(64rem, var(--qtube-catalogue-max, 80rem));
  margin: 0 auto;
  padding: var(--qtube-space-4) clamp(0.85rem, 2vw, 1.5rem) var(--qtube-space-5);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  min-width: 0;
  gap: var(--qtube-space-5);
}

.learn-shell--article {
  max-width: min(44rem, var(--qtube-max, 72rem));
  gap: var(--qtube-space-4);
}

.learn-breadcrumbs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 0.5rem;
  list-style: none;
  margin: 0;
  padding: 0;
  color: var(--qtube-muted);
  font-size: 0.9rem;
}

.learn-breadcrumbs__item:not(:last-child)::after {
  content: "/";
  margin-left: 0.5rem;
  color: var(--qtube-border-strong, var(--qtube-muted));
}

.learn-breadcrumbs a {
  color: inherit;
  text-decoration: underline;
  text-underline-offset: 0.15em;
}

.learn-breadcrumbs a:hover {
  color: var(--qtube-text);
}

.learn-breadcrumbs a:focus-visible {
  outline: 3px solid var(--qtube-focus);
  outline-offset: 2px;
  border-radius: 2px;
}

.learn-breadcrumbs [aria-current="page"] {
  color: var(--qtube-text);
}

.learn-kicker {
  margin: 0 0 0.4rem;
  font-size: var(--qtube-label-size, 0.8125rem);
  font-weight: 650;
  letter-spacing: var(--qtube-tracking-label, 0.045em);
  text-transform: uppercase;
  color: color-mix(in srgb, var(--qtube-accent) 55%, var(--qtube-focus, #e8c7b0));
}

.learn-kicker__sep {
  margin: 0 0.35rem;
  color: var(--qtube-muted);
  font-weight: 500;
}

.learn-intro {
  padding-bottom: 0.35rem;
  border-bottom: 1px solid color-mix(in srgb, var(--qtube-border) 80%, transparent);
}

.learn-intro h1,
.learn-article__header h1 {
  margin: 0 0 0.7rem;
  font-size: clamp(1.9rem, 3.4vw, 2.55rem);
  line-height: 1.15;
}

.learn-intro .lede,
.learn-article__header .lede {
  margin: 0;
  color: var(--qtube-muted);
  font-size: 1.08rem;
  line-height: 1.55;
  max-width: 42rem;
}

.learn-article__header {
  padding-bottom: 1.35rem;
  margin-bottom: 0.15rem;
  border-bottom: 1px solid color-mix(in srgb, var(--qtube-border) 85%, transparent);
}

.learn-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.35rem;
  margin: 1.2rem 0 0;
}

.learn-meta > div {
  display: grid;
  gap: 0.15rem;
}

.learn-meta dt {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--qtube-muted);
}

.learn-meta dd {
  margin: 0;
  font-size: 0.92rem;
}

.learn-cluster {
  display: grid;
  gap: 0.85rem;
}

.learn-cluster h2,
.learn-sources h2,
.learn-related h2 {
  margin: 0;
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: color-mix(in srgb, var(--qtube-accent) 60%, var(--qtube-focus, #e8c7b0));
}

.learn-cluster h2 {
  padding-bottom: 0.55rem;
  border-bottom: 1px solid color-mix(in srgb, var(--qtube-accent) 28%, var(--qtube-border));
}

.learn-article-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.75rem;
}

.learn-cluster .learn-article-list {
  gap: 0.8rem;
}

@media (min-width: 56rem) {
  .learn-cluster .learn-article-list {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 0.9rem;
  }
}

.learn-article-link {
  display: grid;
  gap: 0.35rem;
  align-content: start;
  padding: 1rem 1.1rem 1.05rem;
  border: 1px solid color-mix(in srgb, var(--qtube-border) 90%, #fff);
  border-radius: var(--qtube-radius-card, var(--qtube-radius-lg));
  border-left: 3px solid color-mix(in srgb, var(--qtube-accent) 55%, var(--qtube-border));
  background: color-mix(in srgb, var(--qtube-surface) 92%, transparent);
  color: inherit;
  text-decoration: none;
}

.learn-article-link:hover {
  border-color: color-mix(in srgb, var(--qtube-accent) 42%, var(--qtube-border));
  border-left-color: var(--qtube-accent);
  background: color-mix(in srgb, var(--qtube-accent) 8%, var(--qtube-surface));
  color: var(--qtube-text);
}

.learn-article-link:hover .learn-article-link__title,
.learn-article-link:focus-visible .learn-article-link__title {
  color: #fff;
}

.learn-article-link:focus-visible {
  outline: 3px solid var(--qtube-focus);
  outline-offset: 2px;
}

.learn-article-link__title {
  font-size: 1.08rem;
  font-weight: 650;
  line-height: 1.28;
}

.learn-article-link__dek {
  color: var(--qtube-muted);
  font-size: 0.95rem;
  line-height: 1.45;
  display: -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 3;
  overflow: hidden;
}

.learn-path-section,
.learn-explore,
.learn-start {
  scroll-margin-top: 5.5rem;
}

.learn-empty {
  color: var(--qtube-muted);
}

.learn-article,
.learn-prose {
  min-width: 0;
}

.learn-prose {
  font-size: 1.05rem;
  line-height: 1.72;
}

.learn-prose > *:first-child {
  margin-top: 0;
}

.learn-prose h2,
.learn-prose h3,
.learn-prose h4 {
  margin: 1.6rem 0 0.7rem;
  line-height: 1.28;
  color: var(--qtube-text);
}

.learn-prose > h2 {
  margin-top: 2.15rem;
  padding-top: 0.15rem;
  font-size: 1.38rem;
  font-weight: 700;
}

.learn-prose > h3 {
  font-size: 1.12rem;
}

.learn-prose > h4 {
  font-size: 1.02rem;
}

.learn-prose p,
.learn-prose ul,
.learn-prose ol,
.learn-prose blockquote {
  margin: 0 0 1.05rem;
}

.learn-prose ul,
.learn-prose ol {
  padding-left: 1.25rem;
}

.learn-prose li + li {
  margin-top: 0.35rem;
}

.learn-prose a {
  color: var(--qtube-focus, #e8c7b0);
  text-underline-offset: 0.14em;
  overflow-wrap: anywhere;
}

.learn-prose a:hover {
  color: #fff;
}

.learn-prose a:focus-visible {
  outline: 3px solid var(--qtube-focus);
  outline-offset: 2px;
  border-radius: 2px;
}

.learn-prose code {
  font-size: 0.92em;
  padding: 0.1em 0.35em;
  border-radius: 0.25rem;
  background: color-mix(in srgb, var(--qtube-text) 8%, transparent);
  overflow-wrap: anywhere;
}

.learn-prose pre {
  overflow-x: auto;
  padding: 0.9rem 1rem;
  border-radius: var(--qtube-radius-lg, 0.75rem);
  background: color-mix(in srgb, var(--qtube-surface-2) 88%, #000);
  border: 1px solid var(--qtube-border);
}

.learn-prose pre code {
  padding: 0;
  background: none;
  overflow-wrap: normal;
}

.learn-prose blockquote {
  padding: 0.15rem 0 0.15rem 1rem;
  border-left: 3px solid color-mix(in srgb, var(--qtube-accent) 55%, var(--qtube-border, #444));
  color: var(--qtube-muted);
}

.learn-eli5 {
  margin: 0 0 2rem;
  padding: 1.05rem 1.15rem 1.15rem;
  border-radius: var(--qtube-radius-card, var(--qtube-radius-lg));
  border: 1px solid color-mix(in srgb, var(--qtube-accent) 32%, var(--qtube-border));
  border-left: 3px solid var(--qtube-accent);
  background:
    linear-gradient(
      180deg,
      color-mix(in srgb, var(--qtube-accent) 12%, var(--qtube-surface)),
      color-mix(in srgb, var(--qtube-accent) 6%, var(--qtube-surface))
    );
}

.learn-eli5 h2 {
  margin: 0 0 0.55rem;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: color-mix(in srgb, var(--qtube-accent) 45%, var(--qtube-focus, #e8c7b0));
}

.learn-eli5 p {
  margin: 0;
  color: var(--qtube-text);
  font-size: 1.06rem;
  line-height: 1.68;
}

.learn-eli5 p + p {
  margin-top: 0.7rem;
}

.learn-eli5 + h2 {
  margin-top: 1.65rem;
}

.learn-sources {
  margin-top: 2.4rem;
  padding: 1.35rem 1.2rem 1.45rem;
  border-radius: var(--qtube-radius-card, var(--qtube-radius-lg));
  border-top: 1px solid color-mix(in srgb, var(--qtube-accent) 30%, var(--qtube-border));
  background: color-mix(in srgb, var(--qtube-surface) 90%, transparent);
}

.learn-sources h2 {
  margin: 0 0 1rem;
}

.learn-sources__list {
  margin: 0;
  padding-left: 1.25rem;
  display: grid;
  gap: 1.05rem;
}

.learn-sources__list a {
  color: var(--qtube-focus, #e8c7b0);
  font-weight: 600;
  text-underline-offset: 0.14em;
}

.learn-sources__list a:hover {
  color: #fff;
}

.learn-sources__list a:focus-visible {
  outline: 3px solid var(--qtube-focus);
  outline-offset: 2px;
  border-radius: 2px;
}

.learn-sources a[target="_blank"]::after {
  content: " \2197";
  font-size: 0.82em;
  font-weight: 500;
  color: var(--qtube-muted);
}

.learn-sources__meta,
.learn-sources__type {
  display: block;
  color: var(--qtube-muted);
  font-size: 0.9rem;
}

.learn-sources__note {
  margin: 0.3rem 0 0;
  color: var(--qtube-muted);
  font-size: 0.9rem;
}

.learn-related {
  margin-top: 0.35rem;
  display: grid;
  gap: 0.85rem;
}

.learn-related h2 {
  margin: 0;
}

.learn-article-link__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem 0.65rem;
}

.learn-article-link__topic {
  color: var(--qtube-muted);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.learn-badge {
  display: inline-flex;
  align-items: center;
  padding: 0.12rem 0.45rem;
  border-radius: 999px;
  border: 1px solid color-mix(in srgb, var(--qtube-border) 85%, transparent);
  background: color-mix(in srgb, var(--qtube-surface-2, var(--qtube-surface)) 88%, transparent);
  color: var(--qtube-muted);
  font-size: 0.68rem;
  font-weight: 650;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.learn-badge--beginner {
  border-color: color-mix(in srgb, var(--qtube-accent) 35%, var(--qtube-border));
  color: color-mix(in srgb, var(--qtube-accent) 55%, var(--qtube-focus, #e8c7b0));
}

.learn-badge--intermediate {
  border-color: color-mix(in srgb, var(--qtube-focus, #e8c7b0) 40%, var(--qtube-border));
  color: var(--qtube-focus, #e8c7b0);
}

.learn-badge--advanced {
  border-color: color-mix(in srgb, var(--qtube-text) 28%, var(--qtube-border));
  color: var(--qtube-text);
}

.learn-kicker .learn-badge {
  vertical-align: 0.1em;
}

.learn-start {
  display: grid;
  gap: 1rem;
  padding: 1.15rem 1.15rem 1.25rem;
  border-radius: var(--qtube-radius-card, var(--qtube-radius-lg));
  border: 1px solid color-mix(in srgb, var(--qtube-accent) 28%, var(--qtube-border));
  background:
    linear-gradient(
      180deg,
      color-mix(in srgb, var(--qtube-accent) 10%, var(--qtube-surface)),
      color-mix(in srgb, var(--qtube-surface) 94%, transparent)
    );
}

.learn-start__intro h2 {
  margin: 0 0 0.35rem;
  font-size: clamp(1.25rem, 2.4vw, 1.55rem);
  letter-spacing: 0;
  text-transform: none;
  color: var(--qtube-text);
}

.learn-start__intro p:last-child {
  margin: 0;
  color: var(--qtube-muted);
  font-size: 0.95rem;
  line-height: 1.5;
}

.learn-start__list,
.learn-path-nav ol,
.learn-explore__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.learn-start__list {
  display: grid;
  gap: 0.75rem;
}

.learn-article-link--featured {
  min-height: 0;
}

.learn-path-nav {
  padding: 0.15rem 0 0.1rem;
}

.learn-path-nav ol {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem 0.7rem;
}

.learn-path-nav a {
  color: var(--qtube-muted);
  font-size: 0.86rem;
  text-decoration: underline;
  text-underline-offset: 0.16em;
}

.learn-path-nav a:hover,
.learn-path-nav a:focus-visible {
  color: var(--qtube-text);
}

.learn-path-nav a:focus-visible {
  outline: 3px solid var(--qtube-focus);
  outline-offset: 2px;
  border-radius: 2px;
}

.learn-path-section__head {
  display: grid;
  gap: 0.35rem;
}

.learn-path-section__head h2 {
  padding-bottom: 0.4rem;
}

.learn-path-section__head p {
  margin: 0;
  color: var(--qtube-muted);
  font-size: 0.95rem;
  line-height: 1.5;
  max-width: 42rem;
}

.learn-explore {
  display: grid;
  gap: 0.9rem;
  padding-top: 0.35rem;
}

.learn-explore__head h2 {
  margin: 0 0 0.35rem;
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: color-mix(in srgb, var(--qtube-accent) 60%, var(--qtube-focus, #e8c7b0));
}

.learn-explore__head p {
  margin: 0;
  color: var(--qtube-muted);
  font-size: 0.95rem;
}

.learn-explore__search input {
  width: 100%;
  max-width: 24rem;
  padding: 0.65rem 0.8rem;
  border: 1px solid var(--qtube-border);
  border-radius: var(--qtube-radius-lg, 0.75rem);
  background: color-mix(in srgb, var(--qtube-surface) 92%, transparent);
  color: var(--qtube-text);
  font: inherit;
}

.learn-explore__search input:focus-visible {
  outline: 3px solid var(--qtube-focus);
  outline-offset: 2px;
}

.learn-explore__empty {
  margin: 0;
  color: var(--qtube-muted);
}

.learn-explore__list {
  display: grid;
  gap: 0.45rem;
}

.learn-explore__list a {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.35rem 1rem;
  padding: 0.7rem 0.85rem;
  border: 1px solid color-mix(in srgb, var(--qtube-border) 80%, transparent);
  border-radius: var(--qtube-radius-lg, 0.75rem);
  background: color-mix(in srgb, var(--qtube-surface) 88%, transparent);
  color: inherit;
  text-decoration: none;
}

.learn-explore__list a:hover,
.learn-explore__list a:focus-visible {
  border-color: color-mix(in srgb, var(--qtube-accent) 40%, var(--qtube-border));
  color: var(--qtube-text);
}

.learn-explore__list a:focus-visible {
  outline: 3px solid var(--qtube-focus);
  outline-offset: 2px;
}

.learn-explore__title {
  font-weight: 600;
  line-height: 1.3;
}

.learn-explore__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem 0.55rem;
  color: var(--qtube-muted);
  font-size: 0.78rem;
}

.learn-continue {
  display: grid;
  gap: 0.7rem;
  margin: 2rem 0 0;
}

.learn-continue__next {
  display: grid;
  gap: 0.25rem;
  padding: 0.95rem 1.05rem;
  border: 1px solid color-mix(in srgb, var(--qtube-accent) 32%, var(--qtube-border));
  border-left: 3px solid var(--qtube-accent);
  border-radius: var(--qtube-radius-card, var(--qtube-radius-lg));
  background: color-mix(in srgb, var(--qtube-accent) 8%, var(--qtube-surface));
  color: inherit;
  text-decoration: none;
}

.learn-continue__next:hover,
.learn-continue__next:focus-visible {
  color: var(--qtube-text);
}

.learn-continue__next:focus-visible,
.learn-continue__prev:focus-visible {
  outline: 3px solid var(--qtube-focus);
  outline-offset: 2px;
}

.learn-continue__label {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: color-mix(in srgb, var(--qtube-accent) 55%, var(--qtube-focus, #e8c7b0));
}

.learn-continue__title {
  font-size: 1.05rem;
  font-weight: 650;
  line-height: 1.3;
}

.learn-continue__prev {
  color: var(--qtube-muted);
  font-size: 0.92rem;
  text-decoration: underline;
  text-underline-offset: 0.16em;
}

.learn-continue__prev:hover {
  color: var(--qtube-text);
}

.learn-continue__prev-title {
  margin-left: 0.4rem;
}

@media (min-width: 40rem) {
  .learn-start__list {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  }
}

@media (min-width: 56rem) {
  .learn-start__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 40rem) {
  .learn-shell {
    gap: var(--qtube-space-4);
    padding-left: 0.9rem;
    padding-right: 0.9rem;
  }

  .learn-article-link {
    padding: 0.9rem 0.95rem;
  }

  .learn-eli5,
  .learn-sources {
    padding-left: 0.95rem;
    padding-right: 0.95rem;
  }
}

@media (prefers-reduced-motion: no-preference) {
  .learn-article-link {
    transition: border-color 0.15s ease, background-color 0.15s ease, color 0.15s ease;
  }

  .learn-prose a,
  .learn-sources__list a,
  .learn-breadcrumbs a {
    transition: color 0.12s ease;
  }
}