/* --------------------------------------------------------------------------
 * courses.css — page styles for the public course catalog (/courses/) and the
 * course detail page. Loaded by the courses/*.html templates (NOT by base.html,
 * which is owned by a parallel agent). Reuses the design tokens declared in
 * site.css (:root --ty-* vars); adds only catalog-specific components here.
 *
 * Each course card/header sets a local `--card-accent` custom property (from the
 * course's deterministic art color) so its frame/badge tint matches its cover.
 * ----------------------------------------------------------------------- */

/* --- Catalog hero -------------------------------------------------------- */
.courses-hero {
  margin-bottom: 1.5rem;
}
.courses-hero .lede {
  max-width: 44rem;
}

/* --- Catalog search box -------------------------------------------------- */
.course-search {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin: 0 0 1.25rem;
}
.course-search__input {
  flex: 1;
  max-width: 26rem;
  padding: 0.5rem 0.85rem;
  border: 1px solid var(--ty-border);
  border-radius: 999px;
  background: var(--ty-bg);
  color: var(--ty-ink);
  font: inherit;
  font-size: 0.9rem;
}
.course-search__input:focus {
  outline: none;
  border-color: var(--ty-brand);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
}
.course-search__btn {
  flex: none;
  padding: 0.5rem 1.1rem;
  border: 1px solid var(--ty-brand);
  border-radius: 999px;
  background: var(--ty-brand);
  color: #fff;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}
@media (hover: hover) and (pointer: fine) {
  .course-search__btn:hover { opacity: 0.92; }
}
.course-search__clear {
  flex: none;
  color: var(--ty-muted);
  font-size: 0.85rem;
}
@media (hover: hover) and (pointer: fine) {
  .course-search__clear:hover { color: var(--ty-ink); }
}

/* --- Level filter chips -------------------------------------------------- */
.course-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 0 0 1.75rem;
}
.course-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.35rem 0.85rem;
  border: 1px solid var(--ty-border);
  border-radius: 999px;
  background: var(--ty-bg);
  color: var(--ty-muted);
  font-size: 0.85rem;
  font-weight: 600;
  line-height: 1.2;
}
@media (hover: hover) and (pointer: fine) {
  .course-chip:hover {
    text-decoration: none;
    border-color: var(--ty-brand);
    color: var(--ty-ink);
  }
}
.course-chip--active {
  background: var(--ty-brand);
  border-color: var(--ty-brand);
  color: #fff;
}
.course-chip__count {
  font-size: 0.72rem;
  opacity: 0.75;
}
.course-chip--active .course-chip__count { opacity: 0.9; }

/* --- Catalog grid + cards ------------------------------------------------ */
.course-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1.25rem;
  margin: 0 0 2rem;
}
.course-card {
  display: flex;
  flex-direction: column;
  border: 1px solid var(--ty-border);
  border-radius: 14px;
  overflow: hidden;
  background: var(--ty-bg);
  color: var(--ty-ink);
  transition: transform 0.12s ease, box-shadow 0.12s ease, border-color 0.12s ease;
}
@media (hover: hover) and (pointer: fine) {
  .course-card:hover {
    text-decoration: none;
    transform: translateY(-3px);
    border-color: var(--card-accent, var(--ty-brand));
    box-shadow: 0 10px 24px rgba(31, 41, 51, 0.10);
  }
}
/* Cover art sits in a fixed-ratio band; the inline SVG fills it. */
.course-card__art {
  aspect-ratio: 20 / 11;
  border-bottom: 1px solid var(--ty-border);
}
.course-art__svg {
  display: block;
  width: 100%;
  height: 100%;
}
.course-card__body {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  padding: 0.9rem 1rem 1.1rem;
}
.course-card__title {
  font-size: 1.1rem;
  margin: 0;
}
.course-card__blurb {
  margin: 0;
  color: var(--ty-muted);
  font-size: 0.9rem;
  /* Clamp the blurb to keep cards a consistent height. */
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.course-card__stats {
  list-style: none;
  margin: 0.25rem 0 0;
  padding: 0;
  display: flex;
  gap: 1rem;
  color: var(--ty-muted);
  font-size: 0.82rem;
}
.course-card__stats strong { color: var(--ty-ink); }

/* Level/age badge — tinted to the card accent color. */
.course-badge {
  align-self: flex-start;
  display: inline-block;
  padding: 0.15rem 0.55rem;
  border-radius: 999px;
  background: var(--card-accent, var(--ty-brand));
  color: #fff;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

/* --- Empty states -------------------------------------------------------- */
.courses-empty {
  padding: 1.5rem;
  border: 1px dashed var(--ty-border);
  border-radius: 12px;
  background: var(--ty-panel);
  color: var(--ty-muted);
  text-align: center;
}

/* --- Detail: breadcrumb + header ---------------------------------------- */
.course-breadcrumb {
  margin: 0 0 1rem;
  font-size: 0.9rem;
}
.course-detail__header {
  display: grid;
  grid-template-columns: minmax(0, 320px) minmax(0, 1fr);
  gap: 1.5rem;
  align-items: center;
  margin-bottom: 2rem;
}
.course-detail__art {
  aspect-ratio: 20 / 11;
  border: 1px solid var(--ty-border);
  border-radius: 14px;
  overflow: hidden;
}
.course-detail__intro h1 { margin: 0.5rem 0; }
.course-detail__stats {
  list-style: none;
  margin: 1rem 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.5rem;
  color: var(--ty-muted);
  font-size: 0.9rem;
}
.course-detail__stats strong {
  color: var(--ty-ink);
  font-size: 1.05rem;
}

/* --- Detail: two-column layout (content + CTA) -------------------------- */
.course-detail__layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 300px);
  gap: 2rem;
  align-items: start;
}

/* --- Accordion (chapters -> lessons) ------------------------------------ */
.course-accordion {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}
.course-chapter {
  border: 1px solid var(--ty-border);
  border-radius: 10px;
  background: var(--ty-panel);
  overflow: hidden;
}
.course-chapter__summary {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding: 0.8rem 1rem;
  cursor: pointer;
  font-weight: 600;
  list-style: none;
}
/* Custom disclosure marker (hide the default triangle, add our own caret). */
.course-chapter__summary::-webkit-details-marker { display: none; }
.course-chapter__summary::after {
  content: "\25BC";
  color: var(--ty-muted);
  font-size: 0.7rem;
  transition: transform 0.12s ease;
}
.course-chapter[open] .course-chapter__summary::after { transform: rotate(180deg); }
.course-chapter__title { flex: 1; }
.course-chapter__meta {
  color: var(--ty-muted);
  font-size: 0.82rem;
  font-weight: 500;
  white-space: nowrap;
}
.course-chapter__desc {
  margin: 0;
  padding: 0 1rem 0.5rem;
  color: var(--ty-muted);
  font-size: 0.9rem;
}
.course-lesson-list {
  margin: 0;
  padding: 0 0 0.5rem;
  list-style: none;
  background: var(--ty-bg);
}
.course-lesson {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding: 0.55rem 1rem;
  border-top: 1px solid var(--ty-border);
  font-size: 0.92rem;
}
.course-lesson__meta {
  color: var(--ty-muted);
  font-size: 0.8rem;
  white-space: nowrap;
}

/* --- "What you'll learn" concept pills ---------------------------------- */
.course-concepts {
  list-style: none;
  margin: 0.5rem 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.course-concept {
  padding: 0.3rem 0.7rem;
  border: 1px solid var(--ty-border);
  border-radius: 8px;
  background: var(--ty-panel);
  font-size: 0.85rem;
}

/* --- CTA box ------------------------------------------------------------- */
.course-cta {
  position: sticky;
  top: 1rem;
  border: 1px solid var(--ty-border);
  border-radius: 14px;
  padding: 1.25rem;
  background: var(--ty-panel);
}
.course-cta__title { margin: 0 0 0.25rem; font-size: 1.15rem; }
.course-cta__lede { margin: 0 0 1rem; color: var(--ty-muted); font-size: 0.9rem; }
.course-cta__btn {
  display: block;
  width: 100%;
  text-align: center;
  padding: 0.7rem 1rem;
  border-radius: 10px;
  font-weight: 700;
  margin-bottom: 0.6rem;
}
@media (hover: hover) and (pointer: fine) {
  .course-cta__btn:hover { text-decoration: none; opacity: 0.92; }
}
.course-cta__btn--primary {
  background: var(--ty-brand);
  color: #fff;
}
.course-cta__btn--secondary {
  background: var(--ty-bg);
  color: var(--ty-ink);
  border: 1px solid var(--ty-border);
}
.course-cta__note {
  margin: 0.4rem 0 0;
  font-size: 0.82rem;
  color: var(--ty-muted);
}

/* --- Responsive: stack detail columns on narrow viewports --------------- */
@media (max-width: 720px) {
  .course-detail__header { grid-template-columns: 1fr; }
  .course-detail__layout { grid-template-columns: 1fr; }
  .course-cta { position: static; }
}

/* --- Per-language landing (CURR-012) ----------------------------------- */
.curriculum-hero__cta { margin-top: 18px; }
.curriculum-section__h { font-size: 1.4rem; margin: 8px 0 18px; color: #1f2937; }
.curriculum-section__more { margin-top: 24px; }
.curriculum-section__more a { color: #6c4aee; text-decoration: none; font-weight: 600; }

/* --- Teacher/parent Answer Keys page (CURR-066) ------------------------ */
.answer-keys { max-width: 900px; margin: 24px auto; padding: 0 16px; }
.answer-keys__note { color: #b45309; background: #fffbeb; border: 1px solid #fde68a;
  padding: 8px 12px; border-radius: 8px; display: inline-block; font-size: 0.9rem; }
.answer-keys__picker { margin: 16px 0; }
.answer-keys__picker select { padding: 6px 10px; border-radius: 8px; border: 1px solid #d1d5db; }
.answer-keys__chapter { border-top: 1px solid #e5e7eb; padding: 12px 0; }
.answer-keys__lesson { margin: 8px 0 8px 12px; }
.answer-keys__list { list-style: none; padding: 0; margin: 6px 0; }
.answer-keys__item { display: flex; gap: 12px; align-items: baseline;
  padding: 6px 0; border-bottom: 1px dashed #eee; }
.answer-keys__act { flex: 1 1 auto; font-weight: 600; color: #1f2937; }
.answer-keys__type { color: #6b7280; font-size: 0.8rem; text-transform: uppercase; }
.answer-keys__answer { flex: 0 0 40%; color: #111827; }
.answer-keys__answer a { color: #6c4aee; }
.answer-keys__locked { color: #6b7280; }

/* Catalog editor / IDE-type filter group (CURR-004) — a labelled sub-list in
   the category side-nav for filtering by the editor a course runs in. */
.curriculum-catnav__group { margin-top: 1rem; }
.curriculum-catnav__heading {
  margin: 0 0 0.35rem;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: #6b7280;
}

/* #1092: inline solution-image thumbnails on the answer-keys page. */
.answer-keys__img { max-width: 180px; max-height: 120px; border: 1px solid #e5e7eb;
  border-radius: 6px; margin-right: 8px; vertical-align: middle; }