/* hugo/assets/css/topics.css
   Topics gallery + cluster-detail page styles.
   Uses Horizon CSS tokens per project convention (see homepage.css).
   Namespace: .topics-*
*/

/* ===== Page wrapper ===== */
.topics-page {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem 3rem;
}

/* ===== Hero / header ===== */
.topics-hero {
  padding: 2.5rem 0 2rem;
}
.topics-hero__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem;
}
.topics-hero__title {
  flex: 1 1 auto;
  font-size: 2rem;
  font-weight: 700;
  color: var(--sapTextColor, #32363a);
  margin: 0;
}
.topics-hero__intro {
  flex-basis: 100%;
  font-size: 1rem;
  color: var(--sapContent_LabelColor, #6a6d70);
  margin: 0.25rem 0 0;
  max-width: 680px;
}
.topics-hero__graphlink {
  flex-basis: 100%;
  font-size: 0.875rem;
  margin: 0.25rem 0 0;
}
.topics-hero__graphlink a {
  color: var(--sapLinkColor, #0064d9);
  text-decoration: none;
}
.topics-hero__graphlink a:hover {
  text-decoration: underline;
}

/* ===== Search box ===== */
.topics-search {
  display: flex;
  align-items: center;
  gap: 0;
  border: 1px solid var(--sapContent_ForegroundBorderColor, #ccc);
  border-radius: 6px;
  overflow: hidden;
  background: var(--sapBaseColor, #fff);
  flex: 0 0 auto;
}
.topics-search__label {
  /* visually hidden but accessible */
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
}
.topics-search__input {
  border: none;
  outline: none;
  padding: 0.45rem 0.75rem;
  font-size: 0.875rem;
  color: var(--sapTextColor, #32363a);
  background: transparent;
  min-width: 200px;
}
.topics-search__input::placeholder {
  color: var(--sapContent_PlaceholderTextColor, #9ea0a2);
}
.topics-search__btn {
  border: none;
  background: var(--sapButton_Background, #f5f6f7);
  color: var(--sapButton_TextColor, #32363a);
  padding: 0.45rem 0.75rem;
  cursor: pointer;
  font-size: 1rem;
  transition: background 0.15s;
}
.topics-search__btn:hover {
  background: var(--sapButton_Hover_Background, #e5e5e5);
}
.topics-search__btn:focus-visible {
  outline: 2px solid var(--sapContent_FocusColor, #0854a0);
  outline-offset: 2px;
}

/* ===== Gallery grid ===== */
.topics-gallery {
  margin-top: 0.5rem;
}
.topics-gallery__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1rem;
  list-style: none;
  padding: 0;
  margin: 0;
}

/* ===== Topic card ===== */
.topics-card {
  display: flex;
}
.topics-card__link {
  display: flex;
  flex-direction: column;
  width: 100%;
  padding: 1.25rem;
  text-decoration: none;
  border: 1px solid var(--sapContent_ForegroundBorderColor, #e5e5e5);
  border-radius: 8px;
  background: var(--sapBaseColor, #fff);
  color: inherit;
  transition: border-color 0.15s, box-shadow 0.15s, transform 0.15s;
}
.topics-card__link:hover {
  border-color: var(--sapLinkColor, #0064d9);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.07);
  transform: translateY(-2px);
  text-decoration: none;
}
.topics-card__link:focus-visible {
  outline: 2px solid var(--sapContent_FocusColor, #0854a0);
  outline-offset: 3px;
}
.topics-card__label {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--sapLinkColor, #0064d9);
  margin: 0 0 0.5rem;
  line-height: 1.35;
}
.topics-card__rationale {
  font-size: 0.875rem;
  color: var(--sapContent_LabelColor, #6a6d70);
  margin: 0 0 0.75rem;
  flex: 1;
  /* Clamp to 3 lines */
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.topics-card__meta {
  margin-top: auto;
  padding-top: 0.5rem;
}
.topics-card__counts {
  font-size: 0.78rem;
  color: var(--sapContent_LabelColor, #6a6d70);
}

/* concept chips */
.topics-card__chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  list-style: none;
  padding: 0;
  margin: 0.65rem 0 0;
}
.topics-card__chip {
  font-size: 0.73rem;
  padding: 0.2rem 0.55rem;
  border-radius: 999px;
  background: var(--sapList_Hover_Background, rgba(0, 112, 242, 0.06));
  color: var(--sapLinkColor, #0064d9);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 140px;
}

/* ===== Empty state ===== */
.topics-empty {
  padding: 3rem 0;
  text-align: center;
}
.topics-empty__msg {
  font-size: 1rem;
  color: var(--sapContent_LabelColor, #6a6d70);
}
.topics-empty__msg a {
  color: var(--sapLinkColor, #0064d9);
}

/* ===== Map section (progressive enhancement) ===== */
.topics-map-section {
  margin-top: 2.5rem;
  min-height: 0; /* collapses if island not mounted */
}

/* ===== Responsive ===== */
@media (max-width: 600px) {
  .topics-gallery__grid { grid-template-columns: 1fr; }
  .topics-hero__inner { flex-direction: column; align-items: flex-start; }
  .topics-search { width: 100%; }
  .topics-search__input { min-width: 0; flex: 1; }
}

/* ========================================================
   Cluster detail page (.topics-detail)
   ======================================================== */
.topics-detail {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 1rem 3rem;
}

/* ===== Breadcrumb ===== */
.topics-breadcrumb {
  padding: 1.25rem 0 0;
}
.topics-breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.25rem;
  list-style: none;
  padding: 0;
  margin: 0;
  font-size: 0.85rem;
}
.topics-breadcrumb__link {
  color: var(--sapLinkColor, #0064d9);
  text-decoration: none;
}
.topics-breadcrumb__link:hover {
  text-decoration: underline;
}
.topics-breadcrumb__sep {
  color: var(--sapContent_LabelColor, #9ea0a2);
  padding: 0 0.1rem;
}
.topics-breadcrumb__item--current {
  color: var(--sapContent_LabelColor, #6a6d70);
}

/* ===== Detail header ===== */
.topics-detail__header {
  padding: 1.5rem 0 1rem;
}
.topics-detail__title {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--sapTextColor, #32363a);
  margin: 0 0 0.5rem;
}
.topics-detail__rationale {
  font-size: 1rem;
  color: var(--sapContent_LabelColor, #6a6d70);
  margin: 0 0 0.75rem;
}
.topics-detail__meta {
  font-size: 0.85rem;
  color: var(--sapContent_LabelColor, #6a6d70);
}

/* ===== Section titles ===== */
.topics-detail__section-title {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--sapTextColor, #32363a);
  margin: 0 0 0.75rem;
}

/* ===== Concepts section ===== */
.topics-detail__concepts {
  margin: 1.75rem 0;
  padding-top: 1.25rem;
  border-top: 1px solid var(--sapContent_ForegroundBorderColor, #e5e5e5);
}
.topics-concepts-list {
  margin: 0;
  padding-left: 1.5rem;
}
.topics-concepts-list--unordered {
  list-style: disc;
}
.topics-concepts-list--ordered {
  list-style: decimal;
}
.topics-concepts-list__item {
  padding: 0.2rem 0;
}
.topics-concepts-list__link {
  color: var(--sapLinkColor, #0064d9);
  text-decoration: none;
}
.topics-concepts-list__link:hover {
  text-decoration: underline;
}

/* ===== Peers section ===== */
.topics-detail__peers {
  margin: 1.75rem 0;
  padding-top: 1.25rem;
  border-top: 1px solid var(--sapContent_ForegroundBorderColor, #e5e5e5);
}
.topics-peers-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  list-style: none;
  padding: 0;
  margin: 0;
}
.topics-peers-list__link {
  display: inline-block;
  padding: 0.35rem 0.9rem;
  border: 1px solid var(--sapContent_ForegroundBorderColor, #ccc);
  border-radius: 999px;
  color: var(--sapLinkColor, #0064d9);
  text-decoration: none;
  font-size: 0.875rem;
  transition: background 0.15s, border-color 0.15s;
}
.topics-peers-list__link:hover {
  background: var(--sapList_Hover_Background, rgba(0, 112, 242, 0.06));
  border-color: var(--sapLinkColor, #0064d9);
  text-decoration: none;
}

/* ===== Detail mini-map ===== */
.topics-detail__map {
  margin-top: 2rem;
  min-height: 0;
}