/**
 * @file
 * Topic Hub styling — content layout + CTA blocks + stats + jump-to nav.
 *
 * Tier 3b addition (May 14, 2026):
 *   - .topic-hub__section-subtitle: descriptive line under each section H3,
 *     injected by topic-hub.js using SECTION_SUBTITLES map. Sits between
 *     the eyebrow-style H3 and the section's content rows.
 *
 * All earlier styling preserved.
 */

/* ============================================================
   CREAM BACKDROP + CENTERED COLUMN
   ============================================================ */

.topic-hub {
  background: #FAF7F2;
  padding: 32px 16px;
  margin: 0 -15px;
  scroll-behavior: smooth;
}

.topic-hub__inner {
  max-width: 980px;
  margin: 0 auto;
}

/* ============================================================
   WHITE CARD
   ============================================================ */

.topic-hub__card {
  background: #FFFFFF;
  border: 1px solid #E8E2D5;
  border-radius: 12px;
  padding: 28px 36px;
  margin: 0 0 24px;
}

.topic-hub__description {
  margin-bottom: 16px;
  font-size: 16px;
  line-height: 1.65;
  color: #2C2C2A;
}
.topic-hub__description p:last-child {
  margin-bottom: 0;
}

/* ============================================================
   STATS LINE
   ============================================================ */

.topic-hub__stats {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 18px;
  margin: 4px 0 20px;
  padding-bottom: 16px;
  border-bottom: 1px solid #F0EBDF;
  font-family: 'IBM Plex Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Arial, sans-serif;
}

.topic-hub__stat {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
}

.topic-hub__stat-number {
  font-size: 18px;
  font-weight: 700;
  color: #2C2C2A;
}

.topic-hub__stat-label {
  font-size: 13px;
  color: #6B6661;
  font-weight: 400;
}

.topic-hub__stat--updated .topic-hub__stat-label {
  font-style: normal;
  color: #6B6661;
}

.topic-hub__stat + .topic-hub__stat::before {
  content: '';
  display: inline-block;
  width: 1px;
  height: 14px;
  background: #D6CFBC;
  margin-right: 12px;
  vertical-align: middle;
  align-self: center;
}

/* ============================================================
   JUMP-TO NAVIGATION CHIPS
   ============================================================ */

.topic-hub__jump {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin: 0 0 24px;
}

.topic-hub__jump-label {
  font-family: 'IBM Plex Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Arial, sans-serif;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.13em;
  color: #6B6661;
  flex-shrink: 0;
}

.topic-hub__jump-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.topic-hub__chip {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 6px 12px;
  background: #FAF7F2;
  border: 1px solid #E8E2D5;
  border-radius: 100px;
  font-family: 'IBM Plex Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Arial, sans-serif;
  font-size: 13px;
  font-weight: 500;
  color: #344563 !important;
  text-decoration: none !important;
  transition: background 0.15s ease, border-color 0.15s ease, transform 0.15s ease;
}

.topic-hub__chip:hover,
.topic-hub__chip:focus {
  background: #FFFFFF;
  border-color: #C97A2C;
  color: #344563 !important;
  text-decoration: none !important;
  transform: translateY(-1px);
}

.topic-hub__chip-count {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  color: #6B6661;
  background: #FFFFFF;
  border: 1px solid #E8E2D5;
  padding: 0 7px;
  border-radius: 100px;
  min-width: 20px;
  text-align: center;
  line-height: 18px;
}

.topic-hub__chip:hover .topic-hub__chip-count,
.topic-hub__chip:focus .topic-hub__chip-count {
  background: #FAF7F2;
  border-color: #E0D9C8;
}

/* ============================================================
   SECTION HIGHLIGHT — transient pulse on jump arrival
   ============================================================ */

.topic-hub__section-highlight {
  outline: none;
  position: relative;
  animation: topicHubHighlight 1.8s ease-out;
}

@keyframes topicHubHighlight {
  0% {
    background-color: rgba(255, 224, 176, 0);
  }
  20% {
    background-color: rgba(255, 224, 176, 0.6);
  }
  100% {
    background-color: rgba(255, 224, 176, 0);
  }
}

@media (prefers-reduced-motion: reduce) {
  .topic-hub__section-highlight {
    animation: none;
    background-color: rgba(255, 224, 176, 0.3);
  }
  .topic-hub {
    scroll-behavior: auto;
  }
}

/* ============================================================
   TIER 3B — Section subtitles (injected by JS after each H3)
   ============================================================ */

.topic-hub__section-subtitle {
  font-family: 'IBM Plex Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Arial, sans-serif;
  font-size: 14px;
  font-weight: 400;
  color: #6B6661;
  font-style: italic;
  margin: -8px 0 16px;  /* negative top pulls closer to H3 */
  line-height: 1.5;
}

/* ============================================================
   TITLE CASE FIX
   ============================================================ */

.page-view-topic-hub h1.title,
.page-view-topic-hub #block-apu-page-title h1 {
  text-transform: none !important;
}

/* ============================================================
   CTAs
   ============================================================ */

.topic-hub__ctas {
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.topic-hub__ctas--top {
  margin: 0 0 24px;
}
.topic-hub__ctas--bottom {
  margin: 24px 0 0;
}

.topic-hub__cta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 24px 28px;
  text-decoration: none;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.topic-hub__cta:hover {
  transform: translateY(-1px);
  text-decoration: none;
}

.topic-hub__cta-image {
  flex-shrink: 0;
  width: 80px;
}
.topic-hub__cta-image img {
  width: 80px;
  height: auto;
  display: block;
  border-radius: 4px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.12), 0 1px 2px rgba(0, 0, 0, 0.08);
}

.topic-hub__cta-text {
  flex: 1;
  min-width: 0;
}

.topic-hub__cta-eyebrow {
  font-family: 'IBM Plex Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Arial, sans-serif;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.13em;
  margin-bottom: 6px;
  font-weight: 500;
}

.topic-hub__cta-headline {
  font-family: 'IBM Plex Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Arial, sans-serif;
  font-weight: 600;
  line-height: 1.3;
  margin-bottom: 6px;
}

.topic-hub__cta-subtext {
  font-family: 'IBM Plex Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Arial, sans-serif;
  font-size: 14px;
  line-height: 1.5;
}

.topic-hub__cta-button {
  flex-shrink: 0;
  font-family: 'IBM Plex Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Arial, sans-serif;
  font-weight: 500;
  font-size: 14px;
  white-space: nowrap;
}

/* PREMIUM style */
.topic-hub__cta--premium {
  background: linear-gradient(135deg, #004573 0%, #0066A8 100%);
  color: #ffffff;
  border-radius: 12px;
}
.topic-hub__cta--premium:hover {
  color: #ffffff;
}
.topic-hub__cta--premium .topic-hub__cta-eyebrow {
  color: #B5D4F4;
  opacity: 1;
}
.topic-hub__cta--premium .topic-hub__cta-headline {
  font-size: 20px;
  color: #ffffff;
}
.topic-hub__cta--premium .topic-hub__cta-subtext {
  color: #B5D4F4;
}
.topic-hub__cta--premium .topic-hub__cta-button {
  background: #ffffff;
  color: #004573;
  padding: 12px 22px;
  border-radius: 100px;
}

/* BOOK style */
.topic-hub__cta--book {
  background: #FFE0B0;
  border-left: 4px solid #C97A2C;
  border-radius: 0 6px 6px 0;
  color: #2C2C2A;
  padding-left: 24px;
}
.topic-hub__cta--book:hover {
  color: #2C2C2A;
}
.topic-hub__cta--book .topic-hub__cta-eyebrow {
  color: #8B4F1A;
}
.topic-hub__cta--book .topic-hub__cta-headline {
  font-size: 17px;
  color: #2C2C2A;
}
.topic-hub__cta--book .topic-hub__cta-subtext {
  color: #5C5A55;
}
.topic-hub__cta--book .topic-hub__cta-button {
  background: #C97A2C;
  color: #FFFFFF;
  padding: 12px 22px;
  border-radius: 6px;
}
.topic-hub__cta--book:hover .topic-hub__cta-button {
  background: #B16A1F;
}

/* ============================================================
   TIER 2 — Content list refinements
   ============================================================ */

.topic-hub__header:empty,
.topic-hub__footer:empty {
  display: none;
}

.topic-hub__content > h3 {
  font-family: 'IBM Plex Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Arial, sans-serif !important;
  font-size: 22px !important;
  font-weight: 600 !important;
  color: #C62E46 !important;
  text-transform: uppercase !important;
  letter-spacing: 0.09em !important;
  margin-top: 28px !important;
  margin-bottom: 8px !important;  /* tighter — subtitle follows */
  padding-bottom: 8px;
  border-bottom: 1px solid #E8E2D5;
  scroll-margin-top: 16px;
}

.topic-hub__content > h3:first-child {
  margin-top: 8px !important;
}

.topic-hub__content span.field-content a {
  color: #1E3A5F !important;
  font-size: 18px !important;
  font-weight: 600 !important;
  text-transform: none !important;
  text-decoration: underline !important;
  text-decoration-color: transparent !important;
  text-decoration-thickness: 2px !important;
  text-underline-offset: 4px !important;
  transition: text-decoration-color 250ms ease;
}

.topic-hub__content span.field-content a:hover,
.topic-hub__content span.field-content a:focus {
  color: #1E3A5F !important;
  text-decoration: underline !important;
  text-decoration-color: #E30B5C !important;
}

/* ============================================================
   MOBILE
   ============================================================ */

@media (max-width: 640px) {
  .topic-hub {
    padding: 20px 12px;
  }
  .topic-hub__card {
    padding: 22px 20px;
  }
  .topic-hub__stats {
    gap: 12px;
    margin-bottom: 16px;
  }
  .topic-hub__stat + .topic-hub__stat::before {
    margin-right: 8px;
  }
  .topic-hub__stat-number {
    font-size: 16px;
  }
  .topic-hub__stat-label {
    font-size: 12px;
  }
  .topic-hub__jump {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }
  .topic-hub__chip {
    font-size: 12px;
    padding: 5px 10px;
  }
  .topic-hub__chip-count {
    font-size: 10px;
    line-height: 16px;
  }
  .topic-hub__section-subtitle {
    font-size: 13px;
  }
  .topic-hub__cta {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
    padding: 20px 22px;
  }
  .topic-hub__cta-image {
    align-self: flex-start;
  }
  .topic-hub__cta-button {
    align-self: flex-start;
  }
  .topic-hub__cta--premium .topic-hub__cta-headline {
    font-size: 18px;
  }
  .topic-hub__cta--book .topic-hub__cta-headline {
    font-size: 16px;
  }
  .topic-hub__content > h3 {
    font-size: 13px !important;
    margin-top: 22px !important;
    margin-bottom: 6px !important;
  }
  .topic-hub__content span.field-content a {
    font-size: 17px !important;
  }
}

/* ============================================================
   DAY 9 ADDITIONS — Section icons + Card grid layout
   ============================================================
   Added June 2026.
   - Section icons: ::before on h3 using attribute selector by id
   - Card grid: 3 cols desktop / 2 tablet / 1 mobile
   - Subtle hover lift on cards
   Requires Bootstrap Icons library (apu/bootstrap_icons) attached
   via topic_hub library dependencies.
   ============================================================ */

/* ---------- Section icons via H3 id attribute selector ---------- */
/*
 * Pattern: Drupal generates h3 ids like "section-article", "section-chemistry-glossary".
 * We map each id to a Bootstrap Icons unicode character via content rule.
 * Falls back gracefully to no icon if id doesn't match any selector.
 */
.topic-hub__content h3 {
  display: flex !important;
  align-items: center !important;
  gap: 0.6rem !important;
}

.topic-hub__content h3::before {
  font-family: bootstrap-icons !important;
  font-style: normal !important;
  font-weight: 400 !important;
  display: inline-flex !important;
  align-items: center !important;
  justify-content: center !important;
  flex-shrink: 0 !important;
  width: 2.2rem !important;
  height: 2.2rem !important;
  font-size: 1.3rem !important;
  color: #5D5E61 !important;
  background: rgba(93, 94, 97, 0.08) !important;
  border-radius: 8px !important;
  line-height: 1 !important;
  /* Default icon if no specific match (book) */
  content: "\f194" !important;
}

/* Per-content-type icons. Unicode codes from bootstrap-icons.min.css */
.topic-hub__content h3[id="section-article"]::before {
  content: "\f444" !important; /* bi-journal-text */
}
.topic-hub__content h3[id="section-chemistry-glossary"]::before {
  content: "\f194" !important; /* bi-book */
}
.topic-hub__content h3[id="section-comparison"]::before {
  content: "\f17c" !important; /* bi-bar-chart-line */
}
.topic-hub__content h3[id="section-curious-chemists-handbook-fun-ex"]::before {
  content: "\f90a" !important; /* bi-flask */
}
.topic-hub__content h3[id="section-discoveries-and-inventions"]::before {
  content: "\f46b" !important; /* bi-lightbulb */
}
.topic-hub__content h3[id="section-numericals"]::before {
  content: "\f1e0" !important; /* bi-calculator */
}
.topic-hub__content h3[id="section-podcast"]::before {
  content: "\f490" !important; /* bi-mic */
}
.topic-hub__content h3[id="section-short-answer-question"]::before {
  content: "\f255" !important; /* bi-chat-quote */
}
.topic-hub__content h3[id="section-blog"]::before {
  content: "\f4cb" !important; /* bi-pencil */
}

/* ---------- Card grid container ---------- */
.topic-hub__cards-grid {
  display: grid !important;
  grid-template-columns: repeat(3, minmax(0, 1fr)) !important;
  gap: 1rem !important;
  margin: 1rem 0 2rem 0 !important;
  /* Neutralize any Bootstrap .row defaults that may apply */
  margin-left: 0 !important;
  margin-right: 0 !important;
  padding: 0 !important;
}

/* Tablet — 2 columns */
@media (max-width: 900px) {
  .topic-hub__cards-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr)) !important;
  }
}

/* Mobile — 1 column */
@media (max-width: 640px) {
  .topic-hub__cards-grid {
    grid-template-columns: 1fr !important;
    gap: 0.75rem !important;
  }
}

/* ---------- Individual card items ---------- */
.topic-hub__card-item {
  background: #ffffff !important;
  border: 1px solid #ede7d4 !important;
  border-radius: 10px !important;
  padding: 0 !important;
  margin: 0 !important;
  /* Neutralize Bootstrap row inheritance */
  width: auto !important;
  max-width: none !important;
  flex: none !important;
  /* Allow growth to match tallest in row */
  display: flex !important;
  flex-direction: column !important;
  /* Smooth hover transitions */
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease !important;
  /* Initial subtle shadow */
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04) !important;
  min-height: 90px !important;
}

.topic-hub__card-item:hover {
  transform: translateY(-2px) !important;
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.08) !important;
  border-color: #d4caa8 !important;
}

.topic-hub__card-item:focus-within {
  border-color: #FF0066 !important;
  box-shadow: 0 0 0 3px rgba(255, 0, 102, 0.15) !important;
}

/* ---------- Card inner padding wrapper ---------- */
.topic-hub__card-item-inner {
  padding: 1rem 1.1rem !important;
  display: flex !important;
  flex-direction: column !important;
  flex: 1 1 auto !important;
}

/* ---------- Item content inside card ---------- */
/* Drupal renders title field as .views-field.views-field-title */
.topic-hub__card-item .views-field-title,
.topic-hub__card-item .field-content {
  font-size: 0.95rem !important;
  line-height: 1.45 !important;
  margin: 0 !important;
}

/* ---------- Card title link styling ---------- */
/* Matches the link pattern used on non-card views (line 390),
   adapted for the smaller card context: default navy with
   transparent underline; pink underline appears on hover. */
.topic-hub__card-item .field-content a,
.topic-hub__card-item .views-field-title a {
  color: #1E3A5F !important;
  font-weight: 500 !important;
  text-decoration: underline !important;
  text-decoration-color: transparent !important;
  text-decoration-thickness: 2px !important;
  text-underline-offset: 3px !important;
  transition: text-decoration-color 200ms ease;
  display: block !important;
}

.topic-hub__card-item:hover .field-content a,
.topic-hub__card-item:hover .views-field-title a,
.topic-hub__card-item .field-content a:focus,
.topic-hub__card-item .views-field-title a:focus {
  color: #1E3A5F !important;
  text-decoration: underline !important;
  text-decoration-color: #E30B5C !important;
}

/* ---------- Reduced motion: disable card transitions ---------- */
@media (prefers-reduced-motion: reduce) {
  .topic-hub__card-item {
    transition: none !important;
  }
  .topic-hub__card-item:hover {
    transform: none !important;
  }
}

/* ============================================================
   DAY 9 POLISH — Kept items only
   ============================================================
   - Slightly darker card border
   - Max-height + line-clamp to prevent extreme card heights
   - Body font size normalization (esp. for numericals which
     has large inline styles on question text)
   ============================================================ */

.topic-hub__card-item {
  border-color: #dfd5b8 !important;
  max-height: 280px !important;
  overflow: hidden !important;
}

.topic-hub__card-item .views-field-title,
.topic-hub__card-item .field-content,
.topic-hub__card-item .views-field-body {
  display: -webkit-box !important;
  -webkit-line-clamp: 5 !important;
  -webkit-box-orient: vertical !important;
  overflow: hidden !important;
}

/* Normalize embedded large fonts within cards (esp. numericals) */
.topic-hub__card-item .views-field-body *,
.topic-hub__card-item .field-content * {
  font-size: 0.9rem !important;
  line-height: 1.45 !important;
}

/* Constrain heading elements that appear INSIDE card bodies
   (e.g., numericals nodes have H3 "Question-" tags in their body)
   These would otherwise inherit global H3 sizes */
.topic-hub__card-item h2,
.topic-hub__card-item h3,
.topic-hub__card-item h4,
.topic-hub__card-item h5,
.topic-hub__card-item h6 {
  font-size: 1rem !important;
  font-weight: 600 !important;
  margin: 0.3rem 0 !important;
  display: block !important;
  line-height: 1.4 !important;
  background: transparent !important;
  /* Reset any flex display inherited from our section H3 rules */
  align-items: initial !important;
  gap: initial !important;
}

/* These nested headings shouldn't show our icon badges */
.topic-hub__card-item h3::before {
  content: none !important;
  display: none !important;
  background: transparent !important;
}