/* ============================================================
   CASE STUDIES PAGE — case-studies.html specific styles
   ============================================================ */

.cs-header {
  padding-top: calc(var(--nav-h) + 4rem);
  padding-bottom: 3rem;
  border-bottom: 1px solid var(--border);
}

.cs-header__title {
  font-family: var(--font-display);
  font-size: clamp(2.2rem, 5vw, 3.5rem);
  font-weight: 700;
  color: var(--text);
  letter-spacing: -2px;
  margin-bottom: 0.75rem;
}

.cs-header__sub {
  color: var(--text-muted);
  font-size: 1rem;
  max-width: 540px;
}

/* ---- CASE STUDY ARTICLE ---- */

.case-study {
  padding: 5rem 0;
  border-bottom: 1px solid var(--border);
}

.case-study:last-of-type {
  border-bottom: none;
}

.cs__index {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  margin-bottom: 0.5rem;
}

.cs__title {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 3vw, 2.25rem);
  font-weight: 700;
  color: var(--text);
  letter-spacing: -1px;
  margin-bottom: 2.5rem;
}

/* Section blocks inside a case study */
.cs__block {
  margin-bottom: 2.5rem;
}

.cs__block-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: 0.75rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.cs__block-label::before {
  content: '';
  display: block;
  width: 16px;
  height: 1px;
  background: var(--accent);
}

.cs__block p {
  color: var(--text-dim);
  line-height: 1.75;
}

/* Challenges list */
.cs__challenges {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.cs__challenge-item {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  font-size: 0.9rem;
  color: var(--text-dim);
}

.cs__challenge-item::before {
  content: '//';
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--accent);
  flex-shrink: 0;
  line-height: 1.55;
}

/* Architecture pipeline */
.cs__pipeline {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  overflow-x: auto;
}

.pipeline-steps {
  display: flex;
  align-items: center;
  gap: 0;
  flex-wrap: wrap;
}

.pipeline-step {
  display: flex;
  align-items: center;
}

.pipeline-step__box {
  background: var(--bg);
  border: 1px solid var(--border-hover);
  border-radius: var(--radius);
  padding: 0.6rem 1rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-dim);
  white-space: nowrap;
  transition: border-color var(--transition), color var(--transition);
}

.pipeline-step__box:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.pipeline-step__arrow {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--accent);
  padding: 0 0.5rem;
  opacity: 0.7;
}

/* Outcome metrics */
.cs__outcomes {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 1rem;
}

.outcome-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  text-align: center;
  transition: border-color var(--transition);
}

.outcome-card:hover {
  border-color: var(--accent);
}

.outcome-card__value {
  font-family: var(--font-display);
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: -1px;
  line-height: 1;
  margin-bottom: 0.35rem;
}

.outcome-card__label {
  font-size: 0.78rem;
  color: var(--text-muted);
  line-height: 1.4;
}

/* ---- TOC (table of contents) ---- */

.cs-toc {
  position: sticky;
  top: calc(var(--nav-h) + 1.5rem);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
}

.cs-toc__title {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: 1rem;
}

.cs-toc__links {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.cs-toc__link {
  font-size: 0.83rem;
  color: var(--text-muted);
  padding: 0.4rem 0.75rem;
  border-radius: 6px;
  border-left: 2px solid transparent;
  transition: all var(--transition);
}

.cs-toc__link:hover,
.cs-toc__link.active {
  color: var(--accent);
  background: var(--accent-dim);
  border-left-color: var(--accent);
}

/* Main layout with sidebar */
.cs-layout {
  display: grid;
  grid-template-columns: 1fr 220px;
  gap: 4rem;
  align-items: start;
  padding-top: 2rem;
}

@media (max-width: 900px) {
  .cs-layout { grid-template-columns: 1fr; }
  .cs-toc { display: none; }
  .pipeline-steps { flex-direction: column; align-items: flex-start; }
  .pipeline-step { flex-direction: column; align-items: flex-start; }
  .pipeline-step__arrow { transform: rotate(90deg); }
}

@media (max-width: 600px) {
  .cs__outcomes { grid-template-columns: repeat(2, 1fr); }
}