/**
 * Case Study Layout & Components — Contemporary Product Studio
 * Modular storytelling template: Hero metadata matrix, sticky index, before/after frames,
 * transparent role attribution, evidence callouts, and next-project pagination.
 */

/* ==========================================================================
   Case Study Hero & Metadata Matrix
   ========================================================================== */

.cs-hero {
  padding: clamp(var(--space-8), 6vw, var(--space-16)) 0 var(--space-12);
  border-bottom: 1px solid var(--color-border-subtle);
  background-color: var(--color-surface);
}

.cs-container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--page-pad);
}

/* Back Navigation Button */
.cs-back-button {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: var(--space-6);
  font-family: var(--font-mono);
  font-size: var(--text-mono-tag);
  font-weight: var(--weight-medium);
  color: var(--color-ink-secondary);
  text-decoration: none;
  padding: 0.35rem 0.75rem;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-sm);
  transition: all var(--duration-fast) var(--ease-out);
  width: fit-content;
}

.cs-back-button:hover {
  color: var(--color-ink-primary);
  border-color: var(--color-border-strong);
  background-color: var(--color-surface-subtle);
  transform: translateX(-2px);
}

.cs-back-button svg {
  width: 14px;
  height: 14px;
  transition: transform var(--duration-fast) var(--ease-out);
}

.cs-back-button:hover svg {
  transform: translateX(-2px);
}

/* Breadcrumb Navigation */
.cs-breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-mono-tag);
  color: var(--color-ink-muted);
  margin-bottom: var(--space-6);
}

.cs-breadcrumb a {
  color: var(--color-ink-secondary);
  transition: color var(--duration-fast) var(--ease-out);
}

.cs-breadcrumb a:hover {
  color: var(--color-ink-primary);
}

.cs-hero-badge-row {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
  flex-wrap: wrap;
}

.cs-hero-title {
  font-size: var(--text-h1);
  color: var(--color-ink-primary);
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-tighter);
  max-width: 24ch;
  margin-bottom: var(--space-4);
}

.cs-hero-lead {
  font-size: var(--text-body-lg);
  color: var(--color-ink-secondary);
  line-height: var(--leading-relaxed);
  max-width: var(--prose-max);
  margin-bottom: var(--space-10);
}

/* 4-Column Metadata Matrix */
.cs-metadata-matrix {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-6);
  padding: var(--space-6) var(--space-8);
  background-color: var(--color-surface-subtle);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-10);
}

.cs-meta-col-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--color-ink-muted);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wider);
  margin-bottom: var(--space-1);
}

.cs-meta-col-value {
  font-size: 0.9375rem;
  font-weight: var(--weight-semibold);
  color: var(--color-ink-primary);
  line-height: 1.35;
}

/* Hero Media Display Frame */
.cs-hero-media {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border-subtle);
  box-shadow: var(--shadow-lg);
  background-color: var(--color-surface-subtle);
  margin-top: var(--space-8);
}

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

/* Hero Media Button Action */
.cs-hero-action {
  margin-top: var(--space-5);
  display: flex;
  justify-content: center;
}

.cs-external-visit-btn {
  text-decoration: none;
}

/* ==========================================================================
   Case Study Main Content & Sticky Index
   ========================================================================== */

.cs-content-layout {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: var(--space-16);
  padding: var(--space-16) 0 var(--space-24);
  align-items: start;
}

/* Sticky In-Page Navigation */
.cs-sticky-sidebar {
  position: sticky;
  top: 100px;
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  padding-right: var(--space-6);
  border-right: 1px solid var(--color-border-subtle);
}

.cs-sidebar-heading {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  text-transform: uppercase;
  letter-spacing: var(--tracking-wider);
  color: var(--color-ink-muted);
}

.cs-toc-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.cs-toc-link {
  font-size: var(--text-body-sm);
  color: var(--color-ink-secondary);
  padding: var(--space-1) 0;
  border-left: 2px solid transparent;
  padding-left: var(--space-3);
  margin-left: calc(-1 * var(--space-3));
  transition: all var(--duration-fast) var(--ease-out);
}

.cs-toc-link:hover,
.cs-toc-link.is-active {
  color: var(--color-ink-primary);
  border-left-color: var(--color-accent-cobalt);
  font-weight: var(--weight-medium);
}

/* Narrative Prose Column */
.cs-prose-column {
  max-width: var(--prose-max);
}

.cs-section {
  margin-bottom: var(--space-16);
  scroll-margin-top: 120px;
}

.cs-section-index {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: #FFFFFF;
  background-color: rgba(255, 85, 32, 0.82);
  border: 1px solid rgba(255, 85, 32, 0.45);
  padding: 0.32rem 0.95rem;
  border-radius: var(--radius-pill);
  font-weight: var(--weight-medium);
  letter-spacing: 0.02em;
  margin-bottom: var(--space-4);
  box-shadow: 0 3px 12px rgba(255, 85, 32, 0.22);
}

.cs-section-heading {
  font-size: var(--text-h2);
  color: var(--color-ink-primary);
  margin-bottom: var(--space-5);
  letter-spacing: var(--tracking-tight);
}

.cs-prose-column p {
  font-size: var(--text-body-lg);
  line-height: var(--leading-relaxed);
  color: var(--color-ink-secondary);
  margin-bottom: var(--space-6);
}

.cs-prose-column p strong {
  color: var(--color-ink-primary);
}

/* ==========================================================================
   Attribution Split Card (Me vs. Team)
   ========================================================================== */

.cs-attribution-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-6);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-md);
  padding: var(--space-8);
  margin: var(--space-8) 0;
}

.cs-attr-col {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.cs-attr-badge {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: var(--weight-bold);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wider);
  padding: 0.25rem 0.5rem;
  border-radius: var(--radius-xs);
  display: inline-block;
  align-self: flex-start;
  margin-bottom: var(--space-2);
}

.cs-attr-badge-mine {
  background-color: var(--color-accent-cobalt-subtle);
  color: var(--color-ink-primary);
  border: 1px solid var(--color-accent-cobalt);
}

.cs-attr-badge-team {
  background-color: var(--color-surface-subtle);
  color: var(--color-ink-muted);
  border: 1px solid var(--color-border-subtle);
}

.cs-attr-title {
  font-size: var(--text-h4);
  color: var(--color-ink-primary);
}

.cs-attr-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.cs-attr-item {
  font-size: var(--text-body-sm);
  color: var(--color-ink-secondary);
  line-height: var(--leading-normal);
  position: relative;
  padding-left: var(--space-4);
}

.cs-attr-item::before {
  content: "•";
  position: absolute;
  left: 0;
  color: var(--color-accent-cobalt);
}

/* ==========================================================================
   Visual Evidence & Comparison Grids
   ========================================================================== */

.cs-figure {
  margin: var(--space-10) 0;
}

.cs-figure-frame {
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-md);
  overflow: hidden;
  background-color: var(--color-surface-subtle);
}

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

.cs-figure-caption {
  margin-top: var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--text-mono-tag);
  color: var(--color-ink-muted);
  line-height: var(--leading-normal);
  display: flex;
  align-items: flex-start;
  gap: var(--space-2);
}

.cs-caption-marker {
  color: var(--color-accent-ink);
  font-weight: var(--weight-bold);
}

/* Side-by-Side Comparison Grid */
.cs-comparison-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-6);
  margin: var(--space-8) 0;
}

.cs-comparison-card {
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-md);
  overflow: hidden;
  background-color: var(--color-surface);
}

.cs-comparison-header {
  padding: var(--space-3) var(--space-4);
  background-color: var(--color-surface-subtle);
  border-bottom: 1px solid var(--color-border-subtle);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: var(--weight-semibold);
  color: var(--color-ink-secondary);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.cs-comparison-body {
  padding: var(--space-4);
}

/* Outcome Highlight Card */
.cs-outcome-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border-subtle);
  border-left: 4px solid var(--color-accent-cobalt);
  border-radius: var(--radius-md);
  padding: var(--space-8);
  margin: var(--space-8) 0;
  box-shadow: var(--shadow-sm);
}

.cs-outcome-header {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-3);
}

.cs-outcome-pill {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: var(--weight-bold);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wider);
  background-color: var(--color-accent-cobalt-subtle);
  color: var(--color-ink-primary);
  border: 1px solid var(--color-accent-cobalt);
  padding: 0.25rem 0.5rem;
  border-radius: var(--radius-xs);
}

.cs-outcome-title {
  font-size: var(--text-h3);
  color: var(--color-ink-primary);
}

/* Next Project Pagination Banner */
.cs-pagination {
  border-top: 1px solid var(--color-border-subtle);
  padding-top: var(--space-12);
  margin-top: var(--space-16);
}

.cs-pagination-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: var(--tracking-wider);
  color: var(--color-ink-muted);
  margin-bottom: var(--space-3);
  display: block;
}

.cs-pagination-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-8);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-md);
  transition: all var(--duration-fast) var(--ease-out);
}

.cs-pagination-card:hover {
  border-color: var(--color-accent-cobalt);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.cs-pagination-title {
  font-size: var(--text-h3);
  color: var(--color-ink-primary);
  margin-bottom: var(--space-1);
}

.cs-pagination-sub {
  font-size: var(--text-body-sm);
  color: var(--color-ink-muted);
}

/* ==========================================================================
   Responsive Adaptations
   ========================================================================== */

@media (max-width: 1024px) {
  .cs-metadata-matrix {
    grid-template-columns: repeat(2, 1fr);
  }

  .cs-content-layout {
    grid-template-columns: 1fr;
    gap: var(--space-10);
  }

  .cs-sticky-sidebar {
    display: none; /* Hide sidebar on mobile / tablet to prioritize prose flow */
  }

  .cs-attribution-split {
    grid-template-columns: 1fr;
  }

  .cs-comparison-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .cs-metadata-matrix {
    grid-template-columns: 1fr;
  }
}