/* PLAIN AI CURRICULUM — _learn.css
   Additive to styles.css. Light + dark via existing theme tokens.
   Established 6 May 2026 alongside build-learn.mjs. */

/* ── Lesson page ──────────────────────────────────────────────────────── */
.lesson-page {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 1.25rem 4rem;
}

.lesson-hero {
  padding: 2rem 0 1.75rem;
  border-bottom: 1px solid var(--hairline);
  margin-bottom: 2rem;
}

.lesson-meta {
  font-family: var(--mono);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 1rem;
}

.lesson-hero h1 {
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  line-height: 1.15;
  margin: 0 0 0.6rem;
  letter-spacing: -0.01em;
}

.lesson-subtitle {
  font-size: 1.15rem;
  color: var(--ivory-soft);
  margin: 0 0 1.5rem;
  line-height: 1.4;
}

.lesson-objective {
  background: var(--bg-elev);
  border-left: 4px solid var(--accent);
  padding: 1rem 1.25rem;
  border-radius: 0 6px 6px 0;
  margin: 1.25rem 0 0;
}

.lesson-objective-label {
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 0.4rem;
}

.lesson-objective p:not(.lesson-objective-label) {
  margin: 0;
  font-size: 1.02rem;
  line-height: 1.55;
}

.lesson-intro {
  font-size: 1.05rem;
  line-height: 1.6;
  margin: 0 0 1.5rem;
}

.lesson-intro p {
  margin: 0.75rem 0;
}

.lesson-section {
  margin: 2.25rem 0;
}

.lesson-section h2 {
  font-size: 1.4rem;
  line-height: 1.25;
  margin: 0 0 0.85rem;
}

.lesson-section p {
  margin: 0.85rem 0;
  font-size: 1.02rem;
  line-height: 1.6;
}

.lesson-section ul,
.lesson-section ol {
  margin: 0.75rem 0;
  padding-left: 1.4rem;
}

.lesson-section li {
  margin: 0.5rem 0;
  line-height: 1.55;
}

.lesson-section blockquote {
  border-left: 3px solid var(--accent);
  padding: 0.5rem 0 0.5rem 1.1rem;
  margin: 1.25rem 0;
  color: var(--ivory-soft);
  font-style: italic;
}

.lesson-example {
  background: var(--bg-elev);
  border: 1px solid var(--hairline);
  padding: 0.85rem 1.05rem;
  border-radius: 6px;
  margin: 1.25rem 0;
}

.lesson-example-label {
  display: block;
  font-family: var(--mono);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 0.45rem;
}

.lesson-example p {
  margin: 0;
  font-style: italic;
  color: var(--ivory-soft);
  font-size: 0.97rem;
}

/* ── Callout boxes (try-this, keep-this, self-check, outputs) ─────────── */
.lesson-callout {
  background: var(--bg-elev);
  border: 1px solid var(--hairline);
  padding: 1.4rem 1.5rem;
  border-radius: 8px;
  margin: 2rem 0;
}

.lesson-callout-label {
  display: block;
  font-family: var(--mono);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 0.85rem;
}

.lesson-try-this {
  border-left: 4px solid var(--accent);
}

.lesson-try-this p,
.lesson-try-this ol,
.lesson-try-this ul {
  margin: 0.6rem 0;
}

.lesson-try-this blockquote {
  border-left: 3px solid var(--accent);
  padding-left: 1rem;
  margin: 0.75rem 0;
  color: var(--ivory-soft);
  font-style: italic;
}

.lesson-keep-this ul {
  margin: 0;
  padding-left: 1.25rem;
  list-style: none;
}

.lesson-keep-this li {
  margin: 0.6rem 0;
  position: relative;
  padding-left: 0;
}

.lesson-self-check .self-check-list {
  margin: 0;
  padding-left: 1.25rem;
}

.lesson-self-check li {
  margin: 0.95rem 0;
}

.self-check-q {
  margin: 0;
  font-weight: 600;
}

.lesson-self-check details {
  margin-top: 0.45rem;
}

.lesson-self-check details summary {
  cursor: pointer;
  color: var(--accent);
  font-size: 0.92rem;
  user-select: none;
}

.lesson-self-check details summary:hover {
  text-decoration: underline;
}

.self-check-a {
  margin: 0.55rem 0 0;
  color: var(--ivory-soft);
  font-style: italic;
  line-height: 1.5;
}

.lesson-outputs ul {
  margin: 0;
  padding-left: 1.25rem;
}

.lesson-outputs li {
  margin: 0.55rem 0;
}

/* ── Anchor topics (back-link) ────────────────────────────────────────── */
.lesson-anchors {
  margin: 2.5rem 0 1.5rem;
  padding: 1.25rem 0;
  border-top: 1px solid var(--hairline);
}

.lesson-anchors h3 {
  font-size: 1.05rem;
  margin: 0 0 0.6rem;
}

.lesson-anchors p {
  margin: 0 0 0.65rem;
  color: var(--ivory-soft);
  font-size: 0.95rem;
}

.lesson-anchors ul {
  margin: 0;
  padding-left: 1.2rem;
}

.lesson-anchors li {
  margin: 0.35rem 0;
}

.lesson-anchors a {
  color: var(--accent);
}

/* ── Sources ──────────────────────────────────────────────────────────── */
.lesson-sources {
  margin: 2rem 0 1.5rem;
  padding: 1.25rem 0;
  border-top: 1px solid var(--hairline);
}

.lesson-sources h3 {
  font-size: 1.05rem;
  margin: 0 0 0.6rem;
}

.lesson-sources ul {
  margin: 0;
  padding-left: 1.2rem;
}

.lesson-sources li {
  margin: 0.4rem 0;
  font-size: 0.93rem;
  line-height: 1.45;
}

.lesson-sources a {
  color: var(--accent);
}

.source-type {
  color: var(--muted);
  font-size: 0.78rem;
  font-family: var(--mono);
  margin-left: 0.3rem;
}

/* ── Lesson navigation ─────────────────────────────────────────────────── */
.lesson-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin: 2.5rem 0 1.5rem;
  padding: 1.5rem 0;
  border-top: 1px solid var(--hairline);
}

.lesson-nav-prev,
.lesson-nav-next {
  display: flex;
  flex-direction: column;
  padding: 1rem 1.1rem;
  border: 1px solid var(--hairline);
  border-radius: 6px;
  text-decoration: none;
  color: var(--ivory);
  background: var(--bg-elev);
  transition: background 0.15s, border-color 0.15s;
}

.lesson-nav-next {
  text-align: right;
  align-items: flex-end;
}

.lesson-nav-prev:hover,
.lesson-nav-next:hover {
  background: var(--bg-card-hover);
  border-color: var(--accent);
}

.lesson-nav-prev .label,
.lesson-nav-next .label {
  font-family: var(--mono);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.3rem;
}

.lesson-nav-prev .title,
.lesson-nav-next .title {
  font-size: 1rem;
  font-weight: 600;
}

@media (max-width: 600px) {
  .lesson-nav {
    grid-template-columns: 1fr;
    gap: 0.6rem;
  }
  .lesson-nav-next {
    text-align: left;
    align-items: flex-start;
  }
}

/* ── Lesson footer + licence note ─────────────────────────────────────── */
.lesson-footer,
.course-footer,
.learn-hub-footer {
  margin-top: 2rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--hairline);
}

.licence-note {
  font-size: 0.85rem;
  color: var(--muted);
  margin: 0;
}

.licence-note a {
  color: var(--muted);
  text-decoration: underline;
}

/* ── Flashcard deck (course-end on practice page) ──────────────────────── */
.flashcard-deck {
  background: var(--bg-elev);
  border: 1px solid var(--hairline);
  padding: 1.5rem 1.5rem 1.75rem;
  border-radius: 10px;
  margin: 2.5rem 0 2rem;
}

.flashcard-deck .deck-intro {
  margin: 0 0 1.25rem;
  color: var(--ivory-soft);
}

.deck-card {
  background: var(--bg-card);
  border: 1px solid var(--hairline);
  padding: 1.5rem;
  border-radius: 8px;
  min-height: 120px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.deck-front,
.deck-back {
  font-size: 1.05rem;
  line-height: 1.5;
}

.deck-front {
  font-weight: 600;
}

.deck-back {
  margin-top: 0.85rem;
  padding-top: 0.85rem;
  border-top: 1px dashed var(--hairline);
  color: var(--ivory-soft);
}

.deck-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 1rem 0 0.85rem;
}

.deck-btn {
  background: var(--bg-card);
  border: 1px solid var(--hairline);
  color: var(--ivory);
  padding: 0.5rem 1rem;
  border-radius: 6px;
  font: inherit;
  font-size: 0.92rem;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s;
}

.deck-btn:hover {
  background: var(--bg-card-hover);
  border-color: var(--accent);
}

.deck-got-it { border-color: var(--accent); color: var(--accent); }

.deck-progress {
  font-size: 0.85rem;
  color: var(--muted);
  margin: 0;
  font-family: var(--mono);
}

/* ── Course landing ───────────────────────────────────────────────────── */
.course-landing {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 1.25rem 4rem;
}

.course-hero {
  padding: 2rem 0 1.75rem;
  border-bottom: 1px solid var(--hairline);
  margin-bottom: 2rem;
}

.course-meta {
  font-family: var(--mono);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 1rem;
}

.course-hero h1 {
  font-size: clamp(1.75rem, 4vw, 2.4rem);
  line-height: 1.15;
  margin: 0 0 0.65rem;
}

.course-subtitle {
  font-size: 1.1rem;
  color: var(--ivory-soft);
  margin: 0 0 1.25rem;
}

.course-intro p {
  font-size: 1.02rem;
  line-height: 1.6;
  margin: 0 0 1rem;
}

.course-outcomes {
  background: var(--bg-elev);
  border-left: 4px solid var(--accent);
  padding: 1.1rem 1.4rem;
  border-radius: 0 6px 6px 0;
  margin: 1.5rem 0 2rem;
}

.course-outcomes h2 {
  font-size: 1.05rem;
  margin: 0 0 0.6rem;
}

.course-outcomes ul {
  margin: 0;
  padding-left: 1.25rem;
}

.course-outcomes li {
  margin: 0.4rem 0;
}

.course-lessons {
  margin: 1.75rem 0 2rem;
}

.course-lessons h2 {
  font-size: 1.4rem;
  margin: 0 0 1rem;
}

.course-lessons-list {
  margin: 0;
  padding-left: 0;
  list-style: none;
}

.course-lesson {
  margin: 0.7rem 0;
}

.course-lesson a {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1rem;
  align-items: start;
  padding: 1.1rem 1.2rem;
  background: var(--bg-elev);
  border: 1px solid var(--hairline);
  border-radius: 8px;
  text-decoration: none;
  color: var(--ivory);
  transition: background 0.15s, border-color 0.15s;
}

.course-lesson a:hover {
  background: var(--bg-card-hover);
  border-color: var(--accent);
}

.course-lesson-num {
  font-family: var(--mono);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent);
  line-height: 1;
  padding-top: 0.15rem;
}

.course-lesson-body {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.course-lesson-title {
  font-size: 1.05rem;
  font-weight: 600;
}

.course-lesson-meta {
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
}

.course-lesson-obj {
  font-size: 0.92rem;
  color: var(--ivory-soft);
  line-height: 1.45;
}

.course-related-paths {
  background: var(--bg-elev);
  border: 1px solid var(--hairline);
  padding: 1rem 1.2rem;
  border-radius: 8px;
  margin: 1.5rem 0;
}

.course-related-paths p {
  margin: 0;
  color: var(--ivory-soft);
  font-size: 0.95rem;
}

/* ── Audience landing ─────────────────────────────────────────────────── */
.audience-landing {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 1.25rem 4rem;
}

.audience-hero {
  padding: 2rem 0 1.75rem;
  border-bottom: 1px solid var(--hairline);
  margin-bottom: 2rem;
  text-align: center;
}

.audience-icon {
  font-size: 2.5rem;
  line-height: 1;
  margin: 0 0 1rem;
}

.audience-hero h1 {
  font-size: clamp(2rem, 5vw, 2.8rem);
  margin: 0 0 0.6rem;
}

.audience-tagline {
  font-size: 1.15rem;
  color: var(--ivory-soft);
  margin: 0 0 1rem;
}

.audience-intro {
  font-size: 1rem;
  line-height: 1.55;
  color: var(--ivory-soft);
  max-width: 540px;
  margin: 0 auto;
}

.audience-courses {
  margin: 1.5rem 0;
}

.audience-courses h2 {
  font-size: 1.4rem;
  margin: 0 0 1rem;
}

.audience-courses-list {
  margin: 0;
  padding-left: 0;
  list-style: none;
}

.audience-course a {
  display: flex;
  flex-direction: column;
  padding: 1.2rem 1.4rem;
  background: var(--bg-elev);
  border: 1px solid var(--hairline);
  border-radius: 8px;
  text-decoration: none;
  color: var(--ivory);
  margin: 0.6rem 0;
  transition: background 0.15s, border-color 0.15s;
}

.audience-course a:hover {
  background: var(--bg-card-hover);
  border-color: var(--accent);
}

.audience-course-title {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 0.3rem;
}

.audience-course-subtitle {
  color: var(--ivory-soft);
  font-size: 0.95rem;
  line-height: 1.5;
  margin-bottom: 0.5rem;
}

.audience-course-meta {
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
}

.audience-extra {
  background: var(--bg-elev);
  border: 1px solid var(--hairline);
  padding: 1rem 1.2rem;
  border-radius: 8px;
  margin: 1.5rem 0;
  font-size: 0.95rem;
  color: var(--ivory-soft);
}

/* ── /learn/ hub (audience triage) ─────────────────────────────────────── */
.learn-hub {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 1.25rem 4rem;
}

.learn-hub-hero {
  padding: 2rem 0 2rem;
  text-align: center;
  border-bottom: 1px solid var(--hairline);
  margin-bottom: 2rem;
}

.learn-hub-meta {
  font-family: var(--mono);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 0.85rem;
}

.learn-hub-hero h1 {
  font-size: clamp(2.2rem, 6vw, 3rem);
  margin: 0 0 0.85rem;
}

.learn-hub-tagline {
  font-size: 1.1rem;
  color: var(--ivory-soft);
  margin: 0;
  max-width: 540px;
  margin: 0 auto;
  line-height: 1.5;
}

.learn-hub-list {
  margin: 0;
  padding-left: 0;
  list-style: none;
}

.learn-hub-audience a {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1.1rem;
  align-items: start;
  padding: 1.4rem 1.5rem;
  background: var(--bg-elev);
  border: 1px solid var(--hairline);
  border-radius: 10px;
  text-decoration: none;
  color: var(--ivory);
  margin: 0.65rem 0;
  transition: background 0.15s, border-color 0.15s;
}

.learn-hub-audience a:hover {
  background: var(--bg-card-hover);
  border-color: var(--accent);
}

.learn-hub-icon {
  font-size: 2.25rem;
  line-height: 1;
  padding-top: 0.15rem;
}

.learn-hub-body {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.learn-hub-name {
  font-size: 1.2rem;
  font-weight: 700;
}

.learn-hub-tagline {
  font-size: 0.95rem;
  color: var(--ivory-soft);
  line-height: 1.5;
}

.learn-hub-meta {
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
  margin-top: 0.2rem;
}

.learn-hub-extra {
  background: var(--bg-elev);
  border: 1px solid var(--hairline);
  padding: 1.2rem 1.4rem;
  border-radius: 10px;
  margin: 2rem 0 1rem;
}

.learn-hub-extra h3 {
  font-size: 1.05rem;
  margin: 0 0 0.7rem;
}

.learn-hub-extra ul {
  margin: 0 0 0.85rem;
  padding-left: 1.2rem;
}

.learn-hub-extra li {
  margin: 0.4rem 0;
  color: var(--ivory-soft);
}

.learn-hub-extra a {
  color: var(--accent);
}

.learn-hub-coming {
  margin: 0.5rem 0 0;
  font-size: 0.9rem;
  color: var(--muted);
}

/* ── Visually-hidden helper ────────────────────────────────────────────── */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}


/* ── Phase 3 a11y fixes (6 May 2026) ───────────────────────────────────── */

/* Link-in-text-block: inline links inside paragraphs/list items must be
   distinguishable beyond colour (WCAG 1.4.1 Use of Color). */
.lesson-page p a,
.lesson-page li a:not(.deck-btn),
.lesson-page aside a,
.lesson-section p a,
.lesson-section li a,
.lesson-intro a,
.lesson-anchors li a,
.lesson-sources li a,
.audience-extra p a,
.audience-extra li a,
.learn-hub-extra li a,
.learn-hub-extra p a,
.course-related-paths p a,
.course-related-paths a,
.licence-note a,
.signpost-strap a,
.static-page-body p a,
.static-page-body li a,
.trail-course-callout p a,
.topic-recent-changes a,
.topic-lessons p a {
  text-decoration: underline;
  text-underline-offset: 2px;
  text-decoration-thickness: 1px;
}

/* Tap targets — keep new buttons / nav links above 44×44px (WCAG 2.5.5). */
.deck-btn {
  min-height: 44px;
  padding: 0.6rem 1.1rem;
}
.signpost-cta {
  min-height: 44px;
}

/* Hide visible h2 in extras (we use visually-hidden h2 for landmark labels). */
.audience-extra > h2.visually-hidden,
.learn-hub-extra > h2.visually-hidden { /* already in main rule, just ensure it's effective */ }

/* learn-hub-extra was an aside inside article — now a section sibling of article.
   Adjust top spacing so it doesn't collide with the article's footer. */
.learn-hub > .learn-hub-extra,
.audience-landing ~ .audience-extra {
  margin-top: 1.5rem;
}


/* ── Translation banner + lang selector (v3 Te Reo bridge) ─────────── */
/* Established 6 May 2026 with the v3 Te Reo Māori bridge. Banner uses
   cultural-respect-first wording; lang selector is light-touch; both
   integrate with existing theme tokens for light + dark. */

.lang-selector {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  margin: 0 auto 1rem;
  max-width: 720px;
  padding: 0 1.25rem;
  flex-wrap: wrap;
}

.lang-selector-link {
  color: var(--ivory-soft);
  text-decoration: none;
  padding: 0.3rem 0.65rem;
  border-radius: 6px;
  border: 1px solid var(--hairline);
  transition: background 0.15s, color 0.15s, border-color 0.15s;
  font-weight: 500;
}

.lang-selector-link:hover {
  background: var(--bg-card-hover, var(--bg-elev));
  color: var(--ivory);
}

.lang-selector-link.active,
.lang-selector-link[aria-current="true"] {
  background: var(--bg-elev);
  color: var(--accent);
  border-color: var(--accent);
}

.lang-selector-sep {
  color: var(--muted-soft);
  user-select: none;
}

.translation-banner {
  max-width: 720px;
  margin: 0 auto 1.5rem;
  padding: 1rem 1.25rem;
  border-radius: 8px;
  font-size: 0.92rem;
  line-height: 1.5;
}

.translation-banner p {
  margin: 0 0 0.4rem;
}

.translation-banner p:last-child {
  margin-bottom: 0;
}

.translation-banner--draft {
  background: var(--bg-elev);
  border: 1px solid var(--accent);
  border-left: 4px solid var(--accent);
  color: var(--ivory);
}

.translation-banner--vetted {
  background: var(--bg-elev);
  border: 1px solid var(--hairline);
  border-left: 4px solid var(--accent);
  color: var(--ivory);
}

.translation-banner-note {
  font-size: 0.85rem;
  color: var(--ivory-soft);
}

/* Translator notes — only on translation pages, after sections. */
.translator-notes {
  background: var(--bg-elev);
  border: 1px dashed var(--hairline);
  border-radius: 8px;
  padding: 1rem 1.25rem;
  margin: 1.5rem 0;
  font-size: 0.92rem;
}

.translator-notes h3 {
  margin: 0 0 0.5rem;
  font-size: 1rem;
  color: var(--accent);
  letter-spacing: 0.04em;
}

.translator-notes-intro {
  margin: 0 0 0.75rem;
  font-style: italic;
  color: var(--ivory-soft);
}

.translator-notes ul {
  margin: 0;
  padding-left: 1.25rem;
}

.translator-notes li {
  margin: 0.4rem 0;
  color: var(--ivory);
}

@media (max-width: 640px) {
  .lang-selector { padding: 0 1rem; }
  .translation-banner { margin-left: 1rem; margin-right: 1rem; }
}