/* ==========================================================================
   CASE STUDY THEME & NARRATIVE LAYOUT
   Modern editorial case study system matching Lovable work.$slug.tsx
   ========================================================================== */

/* Breadcrumb & Subnav */
.cs-breadcrumb-bar {
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--border);
  background-color: var(--background);
}

.cs-back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--muted-foreground);
  transition: color 0.2s;
}

.cs-back-link:hover {
  color: var(--foreground);
}

/* Case Study Hero Media Frame */
.cs-hero-frame {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  border-radius: var(--radius-2xl);
  overflow: hidden;
  border: 1px solid var(--border-strong);
  background-color: var(--surface);
  margin-top: 2rem;
  margin-bottom: 3.5rem;
  box-shadow: 0 20px 50px -20px rgba(0, 0, 0, 0.2);
}

.cs-hero-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* Case Study Header Block */
.cs-header {
  margin-bottom: 3.5rem;
}

.cs-header__company {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--brand);
  margin-bottom: 0.75rem;
}

.cs-header__title {
  font-family: var(--font-display);
  font-size: clamp(2.25rem, 4.5vw, 3.75rem);
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -0.03em;
  color: var(--foreground);
  margin-bottom: 1.25rem;
}

.cs-header__subtitle {
  font-size: clamp(1.125rem, 1.8vw, 1.375rem);
  line-height: 1.55;
  color: var(--muted-foreground);
  max-width: 52rem;
  margin-bottom: 1.75rem;
}

.cs-header__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

/* Overview & Metadata Grid */
.cs-overview-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 3rem;
  padding: 3rem 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  margin-bottom: 4rem;
}

@media (min-width: 768px) {
  .cs-overview-grid {
    grid-template-columns: 1.6fr 1fr;
    gap: 4rem;
  }
}

.cs-overview-text {
  font-size: 1.125rem;
  line-height: 1.7;
  color: var(--foreground);
}

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

.cs-meta-item {
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
}

.cs-meta-label {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--muted-foreground);
}

.cs-meta-value {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--foreground);
}

/* Metrics Highlight Grid */
.cs-metrics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 1.5rem;
  margin-bottom: 4.5rem;
}

.cs-metric-card {
  padding: 2rem 1.5rem;
  border-radius: var(--radius-xl);
  background-color: var(--surface);
  border: 1px solid var(--border);
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.cs-metric-val {
  font-family: var(--font-display);
  font-size: clamp(2.25rem, 4vw, 3rem);
  font-weight: 600;
  color: var(--brand);
  letter-spacing: -0.03em;
  line-height: 1;
}

.cs-metric-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--foreground);
}

/* Narrative Sections */
.cs-narrative-sections {
  display: flex;
  flex-direction: column;
  gap: 5rem;
  margin-bottom: 5rem;
}

.cs-section {
  position: relative;
}

.cs-section__header {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.cs-section__num {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--brand);
  letter-spacing: 0.1em;
}

.cs-section__title {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 2.5vw, 2.25rem);
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--foreground);
}

.cs-section__body {
  font-size: 1.0625rem;
  line-height: 1.75;
  color: var(--foreground);
  max-width: 52rem;
  margin-bottom: 2rem;
}

.cs-callout-card {
  padding: 2rem;
  border-radius: var(--radius-xl);
  background-color: var(--card);
  border: 1px solid var(--border);
  margin-bottom: 2rem;
}

.cs-callout-title {
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--foreground);
  margin-bottom: 0.75rem;
}

.cs-points-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
  margin: 2rem 0;
}

@media (min-width: 640px) {
  .cs-points-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.cs-point-card {
  padding: 1.5rem;
  border-radius: var(--radius-lg);
  background-color: var(--surface);
  border: 1px solid var(--border);
}

.cs-point-title {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 600;
  color: var(--foreground);
  margin-bottom: 0.5rem;
}

.cs-point-desc {
  font-size: 0.875rem;
  color: var(--muted-foreground);
  line-height: 1.6;
}

/* Media Frame with Caption */
.cs-media-frame {
  margin: 2.5rem 0;
  border-radius: var(--radius-xl);
  overflow: hidden;
  border: 1px solid var(--border);
  background-color: var(--surface);
}

.cs-media-frame img {
  width: 100%;
  height: auto;
  display: block;
}

.cs-media-caption {
  padding: 0.875rem 1.25rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--muted-foreground);
  border-top: 1px solid var(--border);
  background-color: var(--card);
}

/* Adjacent Pagination */
.cs-pagination {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  padding-top: 3.5rem;
  border-top: 1px solid var(--border);
  margin-bottom: 4rem;
}

@media (min-width: 640px) {
  .cs-pagination {
    grid-template-columns: repeat(2, 1fr);
  }
}

.cs-nav-card {
  padding: 1.75rem;
  border-radius: var(--radius-xl);
  background-color: var(--card);
  border: 1px solid var(--border);
  text-decoration: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  transition: transform 0.2s, border-color 0.2s;
}

.cs-nav-card:hover {
  transform: translateY(-2px);
  border-color: var(--border-strong);
}

.cs-nav-card__eyebrow {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--muted-foreground);
}

.cs-nav-card__title {
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--foreground);
}