/* Case Study Page Styles — extends styles.css */

/* Hero */
.cs-hero {
  padding: 4rem 0 3rem;
  border-bottom: 1px solid var(--color-border);
}

.cs-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}

.cs-tag {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  padding: 0.25rem 0.75rem;
  border-radius: 100px;
  color: var(--color-text-secondary);
}

.cs-hero-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 3.25rem);
  font-weight: 400;
  letter-spacing: -0.01em;
  line-height: 1.15;
  max-width: 860px;
  margin-bottom: 1.25rem;
}

.cs-hero-subtitle {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
  max-width: 680px;
  line-height: 1.7;
}

/* Project Info Bar */
.cs-info-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 2rem;
  padding: 2rem 0;
  border-bottom: 1px solid var(--color-border);
}

.cs-info-item {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.cs-info-label {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-text-secondary);
}

.cs-info-value {
  font-size: 0.9375rem;
  font-weight: 500;
}

/* Content Layout */
.cs-content {
  padding: 4rem 0;
}

.cs-section {
  margin-bottom: 4rem;
}

.cs-section:last-child {
  margin-bottom: 0;
}

.cs-section-label {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text-secondary);
  margin-bottom: 1rem;
}

.cs-section-title {
  font-size: clamp(1.5rem, 2.5vw, 2rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin-bottom: 1.25rem;
}

.cs-body {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--color-text);
  max-width: 720px;
}

.cs-body p {
  margin-bottom: 1rem;
}

.cs-body p:last-child {
  margin-bottom: 0;
}

/* Two-column layout */
.cs-two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: start;
}

.cs-two-col--wide {
  grid-template-columns: 3fr 2fr;
}

/* Stats / Metrics */
.cs-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-top: 2rem;
}

.cs-stat {
  padding: 1.5rem;
  background: var(--color-card-bg);
  border-radius: 12px;
  border: 1px solid var(--color-border);
}

.cs-stat-value {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1;
  margin-bottom: 0.5rem;
}

.cs-stat-label {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  line-height: 1.4;
}

/* Lists */
.cs-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-top: 1rem;
}

.cs-list li {
  display: flex;
  gap: 0.75rem;
  font-size: 0.9375rem;
  line-height: 1.6;
}

.cs-list li::before {
  content: '—';
  color: var(--color-text-secondary);
  flex-shrink: 0;
  margin-top: 0.05em;
}

/* Numbered list */
.cs-list--numbered {
  counter-reset: list-counter;
}

.cs-list--numbered li {
  counter-increment: list-counter;
}

.cs-list--numbered li::before {
  content: counter(list-counter, decimal-leading-zero);
  font-weight: 600;
  font-size: 0.75rem;
  color: var(--color-text-secondary);
  min-width: 24px;
}

/* Blockquote */
.cs-quote {
  margin: 2rem 0;
  padding: 2rem;
  background: var(--color-card-bg);
  border-left: 3px solid var(--color-text);
  border-radius: 0 12px 12px 0;
}

.cs-quote-text {
  font-size: 1.125rem;
  line-height: 1.7;
  font-style: italic;
  margin-bottom: 0.75rem;
}

.cs-quote-author {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text-secondary);
}

/* Images */
.cs-image {
  width: 100%;
  border-radius: 12px;
  overflow: hidden;
  background: var(--color-card-bg);
  margin: 2rem 0;
}

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

.cs-image-caption {
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
  padding: 0.75rem 1rem;
  border-top: 1px solid var(--color-border);
}

.cs-image-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin: 2rem 0;
}

.cs-image-grid .cs-image {
  margin: 0;
}

/* Problem cards */
.cs-problem-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.25rem;
  margin-top: 1.5rem;
}

.cs-problem-card {
  padding: 1.5rem;
  border: 1px solid var(--color-border);
  border-radius: 12px;
}

.cs-problem-title {
  font-size: 0.9375rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.cs-problem-desc {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* Team section */
.cs-team-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  margin-top: 1.5rem;
}

.cs-team-card {
  padding: 1.25rem;
  background: var(--color-card-bg);
  border-radius: 10px;
}

.cs-team-role {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-text-secondary);
  margin-bottom: 0.25rem;
}

.cs-team-name {
  font-size: 0.9375rem;
  font-weight: 500;
}

/* Divider */
.cs-divider {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: 3rem 0;
}

/* Related projects */
.cs-related {
  padding: 4rem 0;
  border-top: 1px solid var(--color-border);
}

.cs-related-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 2rem;
}

.cs-related-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.cs-related-card {
  display: block;
  border-radius: 10px;
  overflow: hidden;
  background: var(--color-card-bg);
  transition: transform var(--transition), box-shadow var(--transition);
}

.cs-related-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 30px rgba(0,0,0,0.08);
}

.cs-related-image {
  aspect-ratio: 4/3;
  overflow: hidden;
  background: #e0e0e0;
}

.cs-related-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.cs-related-card:hover .cs-related-image img {
  transform: scale(1.04);
}

.cs-related-info {
  padding: 1rem;
}

.cs-related-card-title {
  font-size: 0.9375rem;
  font-weight: 600;
  line-height: 1.35;
  margin-bottom: 0.35rem;
}

.cs-related-desc {
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
  line-height: 1.5;
}

/* Back link */
.cs-back {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  margin-bottom: 2rem;
  transition: color var(--transition);
}

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

/* Responsive */
@media (max-width: 900px) {
  .cs-stats {
    grid-template-columns: repeat(2, 1fr);
  }

  .cs-related-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .cs-two-col,
  .cs-two-col--wide {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
}

@media (max-width: 640px) {
  .cs-hero {
    padding: 2.5rem 0 2rem;
  }

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

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

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

  .cs-info-bar {
    gap: 1.25rem;
  }
}