/**
 * Case Studies Section Styles
 * Tailwind UI–inspired stats grid and pillar layout using site design tokens
 */

/* ============================================
   Hero
   ============================================ */
.cs-hero {
  background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
  padding: 140px 0 80px;
  position: relative;
  overflow: hidden;
}

.cs-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at center, rgba(28, 43, 168, 0.12) 0%, transparent 70%);
  pointer-events: none;
}

.cs-hero-content {
  position: relative;
  z-index: 2;
  max-width: 900px;
}

.cs-hero .breadcrumb {
  margin-bottom: 1.5rem;
  color: var(--text-muted);
  font-size: 0.95rem;
}

.cs-hero .breadcrumb a {
  color: var(--primary-color);
  text-decoration: none;
  transition: opacity 0.2s;
}

.cs-hero .breadcrumb a:hover {
  opacity: 0.8;
}

.cs-title {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 700;
  margin-bottom: 1.25rem;
  background: var(--gradient-tropical);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.2;
}

.cs-subtitle {
  font-size: 1.15rem;
  color: var(--text-secondary);
  max-width: 800px;
  line-height: 1.6;
}

.cs-hero-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
}

.cs-badge {
  display: inline-block;
  padding: 0.3rem 0.85rem;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.cs-badge-industry {
  background: rgba(28, 43, 168, 0.2);
  color: var(--turquoise-color);
  border: 1px solid rgba(28, 43, 168, 0.4);
}

.cs-badge-service {
  background: rgba(255, 107, 53, 0.15);
  color: var(--coral-color);
  border: 1px solid rgba(255, 107, 53, 0.35);
}

.cs-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1.25rem;
  margin-top: 1.5rem;
  color: var(--text-secondary);
}

.cs-date,
.cs-author {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.95rem;
}

.cs-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1rem;
}

.cs-tag {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 500;
  border: 1px solid var(--border-color);
}

/* ============================================
   Listing Grid
   ============================================ */
.cs-section {
  padding: 80px 0;
  background: var(--bg-primary);
}

.cs-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 2rem;
}

.cs-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  overflow: hidden;
  transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
  height: 100%;
}

.cs-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.15);
  border-color: var(--primary-color);
}

.cs-card-content {
  padding: 2rem;
  display: flex;
  flex-direction: column;
  height: 100%;
}

.cs-card-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.cs-card-metric {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  margin-bottom: 1.25rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--border-color);
}

.cs-card-metric-value {
  font-size: 2rem;
  font-weight: 700;
  color: var(--turquoise-color);
  line-height: 1;
}

.cs-card-metric-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.cs-card-title {
  font-size: 1.35rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
  line-height: 1.3;
}

.cs-card-title a {
  color: var(--text-primary);
  text-decoration: none;
  transition: color 0.2s;
}

.cs-card-title a:hover {
  color: var(--primary-color);
}

.cs-card-description {
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 1.5rem;
  flex-grow: 1;
}

.cs-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border-color);
}

.cs-card-date {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.cs-card-link {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--primary-color);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.9rem;
  transition: gap 0.2s;
}

.cs-card-link:hover {
  gap: 0.75rem;
}

/* ============================================
   Stats Bar (Tailwind UI stats pattern)
   ============================================ */
.cs-stats-section {
  padding: 3rem 0;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.cs-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 2rem 2.5rem;
  margin: 0;
}

.cs-stat {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  border-left: 2px solid rgba(255, 255, 255, 0.1);
  padding-left: 1.5rem;
}

.cs-stat-label {
  order: 2;
  font-size: 0.875rem;
  color: var(--text-muted);
  font-weight: 400;
}

.cs-stat-value {
  order: 1;
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.1;
  letter-spacing: -0.02em;
}

/* ============================================
   Problem / Solution / Outcome Pillars
   ============================================ */
.cs-pillars-section {
  padding: 80px 0;
  background: var(--bg-primary);
}

.cs-pillars {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.cs-pillar {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 2rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.cs-pillar-problem {
  border-top: 3px solid var(--coral-color);
}

.cs-pillar-solution {
  border-top: 3px solid var(--primary-color);
}

.cs-pillar-outcome {
  border-top: 3px solid var(--turquoise-color);
}

.cs-pillar-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 10px;
  background: rgba(28, 43, 168, 0.15);
  color: var(--turquoise-color);
}

.cs-pillar-problem .cs-pillar-icon {
  background: rgba(255, 107, 53, 0.15);
  color: var(--coral-color);
}

.cs-pillar-outcome .cs-pillar-icon {
  background: rgba(0, 206, 209, 0.15);
  color: var(--turquoise-color);
}

.cs-pillar-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.3;
}

.cs-pillar-text {
  color: var(--text-secondary);
  line-height: 1.7;
  font-size: 0.975rem;
  flex-grow: 1;
}

.cs-pillar-link {
  color: var(--primary-color);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  margin-top: auto;
}

.cs-pillar-link:hover {
  text-decoration: underline;
}

/* ============================================
   Article Body
   ============================================ */
.cs-article {
  padding: 0 0 80px;
  background: var(--bg-primary);
}

.cs-content-wrapper {
  max-width: 800px;
  margin: 0 auto;
}

.cs-content {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 3rem;
  margin-bottom: 2rem;
  line-height: 1.8;
  font-size: 1.05rem;
}

.cs-content:empty {
  display: none;
}

.cs-content h2,
.cs-content h3,
.cs-content h4 {
  color: var(--text-primary);
  margin-top: 2rem;
  margin-bottom: 1rem;
  font-weight: 600;
  line-height: 1.3;
}

.cs-content h2 {
  font-size: 1.6rem;
  border-bottom: 2px solid var(--border-color);
  padding-bottom: 0.5rem;
}

.cs-content h3 {
  font-size: 1.25rem;
}

.cs-content p {
  margin-bottom: 1.25rem;
  color: var(--text-secondary);
}

.cs-content ul,
.cs-content ol {
  margin: 1.25rem 0;
  padding-left: 1.75rem;
}

.cs-content li {
  margin-bottom: 0.5rem;
  color: var(--text-secondary);
}

.cs-content a {
  color: var(--primary-color);
  text-decoration: underline;
}

.cs-content a:hover {
  opacity: 0.85;
}

.cs-content strong {
  color: var(--text-primary);
}

.cs-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 1024px) {
  .cs-pillars {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .cs-hero {
    padding: 120px 0 60px;
  }

  .cs-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .cs-stats {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
  }

  .cs-content {
    padding: 2rem 1.5rem;
  }

  .cs-footer {
    flex-direction: column;
  }

  .cs-footer .btn {
    width: 100%;
    justify-content: center;
  }
}

@media (max-width: 480px) {
  .cs-stats {
    grid-template-columns: 1fr;
  }
}