/* References Section Styles for Bubble Blog */

/* Main References Section */
.references-section {
  margin-top: 6rem;
  padding: 4rem 0;
  border-top: 1px solid #EEEEEE;
}

/* References Header */
.references-header {
  text-align: center;
  max-width: 800px;
  margin: 0 auto 4rem;
  padding: 0 1rem;
}

.references-title {
  font-size: clamp(1.5rem, 3.5vw, 2.2rem);
  font-weight: 700;
  color: #333333;
  margin-bottom: 1rem;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.references-subtitle {
  font-size: clamp(0.95rem, 2.5vw, 1.2rem);
  color: #666666;
  line-height: 1.6;
  margin-bottom: 0;
  font-weight: 400;
}

/* Categories Grid */
.references-categories {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
}

/* Category Container */
.reference-category {
  border: 1px solid #E5E5E5;
  border-radius: 12px;
  background: #FFFFFF;
  overflow: hidden;
  transition: all 0.3s ease;
}

.reference-category:hover {
  border-color: #D1D1D1;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}

.reference-category.collapsed .category-content {
  display: none;
}

.reference-category.collapsed .category-toggle svg {
  transform: rotate(-90deg);
}

/* Category Header */
.category-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.5rem 2rem;
  background: #FAFAFA;
  border-bottom: 1px solid #E5E5E5;
  cursor: pointer;
  transition: background-color 0.2s ease;
}

.category-header:hover {
  background: #F5F5F5;
}

.category-title {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.25rem;
  font-weight: 600;
  color: #333333;
  margin: 0;
}

.category-icon {
  width: 20px;
  height: 20px;
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
}

/* Category Icon Colors */
.category-value-investing { background: #E3F2FD; color: #1976D2; }
.category-behavioral { background: #E8F5E8; color: #388E3C; }
.category-asset-management { background: #FFEBEE; color: #D32F2F; }
.category-analysis { background: #F3E5F5; color: #7B1FA2; }
.category-market-theory { background: #FFF3E0; color: #F57C00; }
.category-risk { background: #FFFDE7; color: #F9A825; }
.category-economics { background: #FCE4EC; color: #C2185B; }
.category-strategy { background: #F5F5F5; color: #616161; }
.category-general { background: #F0F0F0; color: #424242; }

.category-count {
  font-size: 0.9rem;
  color: #666666;
  font-weight: 400;
}

.category-toggle {
  background: none;
  border: none;
  padding: 0.5rem;
  cursor: pointer;
  border-radius: 6px;
  transition: all 0.2s ease;
  color: #666666;
}

.category-toggle:hover {
  background: #E5E5E5;
  color: #333333;
}

.category-toggle svg {
  transition: transform 0.3s ease;
}

/* Category Content */
.category-content {
  padding: 0 2rem 2rem;
  transition: max-height 0.3s ease;
  overflow: hidden;
}

/* References Grid */
.references-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.5rem;
  margin-top: 1.5rem;
}

/* Reference Card */
.reference-card {
  border: 1px solid #E5E5E5;
  border-radius: 8px;
  background: #FFFFFF;
  padding: 1.5rem;
  transition: all 0.3s ease;
  position: relative;
  display: flex;
  flex-direction: column;
  height: 100%;
}

.reference-card:hover {
  border-color: #D1D1D1;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.04);
  transform: translateY(-5px);
}

/* Reference Header */
.reference-header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.source-type-icon {
  font-size: 1.1rem;
}

.source-type {
  font-size: 0.85rem;
  color: #666666;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Reference Content */
.reference-content {
  flex: 1;
  display: flex;
  flex-direction: column;
}

.reference-link {
  text-decoration: none;
  color: inherit;
  display: block;
  margin-bottom: 1rem;
}

.reference-link:hover .reference-title {
  color: #2196F3;
}

.reference-no-link {
  margin-bottom: 1rem;
}

.reference-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: #333333;
  line-height: 1.4;
  margin: 0 0 0.5rem 0;
  font-style: italic;
  transition: color 0.2s ease;
}

.reference-author {
  font-size: 0.9rem;
  color: #666666;
  margin: 0 0 0.75rem 0;
  font-style: italic;
}

.reference-summary {
  font-size: 0.9rem;
  color: #555555;
  line-height: 1.5;
  margin: 0 0 1rem 0;
  flex: 1;
}

/* Hashtags */
.reference-hashtags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: auto;
  margin-bottom: 1rem;
}

.hashtag {
  background: #F8F8F8;
  color: #666666;
  padding: 0.25rem 0.5rem;
  border-radius: 8px;
  font-size: 0.75rem;
  font-weight: 500;
  font-family: 'Inter', sans-serif;
  border: 1px solid #EEEEEE;
  transition: all 0.2s ease;
}

.hashtag:hover {
  background: #EEEEEE;
  color: #333333;
  transform: translateY(-1px);
}

.hashtag-more {
  background: #F3F4F6;
  color: #6B7280;
  padding: 0.25rem 0.5rem;
  border-radius: 12px;
  font-size: 0.75rem;
  font-weight: 500;
  border: 1px solid #E5E7EB;
}

/* Source Type Icon Large (for headers) */
.source-type-icon-large {
  font-size: 1.3rem;
  margin-right: 0.5rem;
}

/* SVG Source Icons */
.source-icon {
  width: 20px;
  height: 20px;
  fill: #333333;
  transition: fill 0.2s ease;
}

.source-type-icon-large .source-icon {
  width: 32px;
  height: 32px;
}

.category-header:hover .source-icon {
  fill: #2196F3;
}

.reference-header .source-icon {
  width: 16px;
  height: 16px;
  fill: #666666;
}

/* Reference Footer */
.reference-footer {
  margin-top: auto;
  padding-top: 1rem;
}

.reference-link-indicator {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: #333333;
  font-weight: 500;
  font-family: 'Inter', sans-serif;
  text-decoration: none;
  transition: color 0.2s ease;
}

.reference-card:hover .reference-link-indicator {
  color: #444444;
}

.reference-link-indicator svg {
  transition: transform 0.2s ease;
}

.reference-card:hover .reference-link-indicator svg {
  transform: translateX(2px);
}

/* Error and Empty States */
.references-error,
.references-empty {
  text-align: center;
  padding: 3rem 1rem;
  color: #666666;
}

.references-error .error-icon,
.references-empty .empty-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
}

.references-error h3,
.references-empty h3 {
  font-size: 1.25rem;
  color: #333333;
  margin-bottom: 0.5rem;
}

.references-error p,
.references-empty p {
  font-size: 1rem;
  margin-bottom: 1.5rem;
}

.retry-button {
  background: #2196F3;
  color: white;
  border: none;
  padding: 0.75rem 1.5rem;
  border-radius: 6px;
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: background-color 0.2s ease;
}

.retry-button:hover {
  background: #1976D2;
}

/* Mobile Responsive */
@media (max-width: 768px) {
  .references-section {
    margin-top: 4rem;
    padding: 3rem 0;
  }

  .references-header {
    margin-bottom: 3rem;
  }

  .references-categories {
    gap: 1.5rem;
  }

  .category-header {
    padding: 1.25rem 1.5rem;
  }

  .category-content {
    padding: 0 1.5rem 1.5rem;
  }

  .references-grid {
    grid-template-columns: 1fr;
    gap: 1rem;
    margin-top: 1rem;
  }

  .reference-card {
    padding: 1.25rem;
  }

  .category-title {
    font-size: 1.1rem;
  }

  .reference-title {
    font-size: 1rem;
  }
}

@media (max-width: 480px) {
  .references-header {
    padding: 0 1.5rem;
  }

  .references-categories {
    padding: 0 1rem;
  }

  .category-header {
    padding: 1rem 1.25rem;
  }

  .category-content {
    padding: 0 1.25rem 1.25rem;
  }

  .reference-card {
    padding: 1rem;
  }
}