/* ============================================================
   case-study.css — case study page layout and components
   ============================================================ */

/* ── Page wrapper ── */
.cs-page {
  max-width: 780px;
  margin: 0 auto;
  padding: 10rem 2rem 8rem;
}

/* ── Header ── */
.cs-header {
  margin-bottom: 5rem;
}

.cs-back {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--mid);
  text-decoration: none;
  margin-bottom: 3rem;
  transition: color 0.2s;
}

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

.cs-eyebrow {
  display: flex;
  align-items: center;
  gap: 0.65em;
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--mid);
  margin-bottom: 1rem;
}

.cs-eyebrow::before {
  content: "";
  display: inline-block;
  width: 1.3em;
  height: 2px;
  background: var(--accent);
}

.cs-title {
  font-family: var(--serif);
  font-size: clamp(2.25rem, 6vw, 4rem);
  letter-spacing: -0.02em;
  line-height: 1.05;
  color: var(--ink);
  margin-bottom: 2rem;
}

.cs-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 2rem;
  padding: 1.5rem 0;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  margin-bottom: 2rem;
}

.cs-meta-item {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.cs-meta-label {
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--mid);
}

.cs-meta-value {
  font-size: 0.9rem;
  font-weight: 400;
  color: var(--ink);
}

.cs-outcome-callout {
  font-size: 1.0625rem;
  font-weight: 300;
  color: var(--mid);
  line-height: 1.7;
  font-style: italic;
}

/* ── Cover image placeholder ── */
.cs-cover {
  width: 100%;
  aspect-ratio: 16 / 9;
  background: var(--rule);
  border-radius: 2px;
  margin-bottom: 5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

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

.cs-cover-placeholder {
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--mid);
}

/* ── Sections ── */
.cs-section {
  margin-bottom: 4rem;
}

.cs-section-label {
  display: flex;
  align-items: center;
  gap: 0.65em;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--mid);
  margin-bottom: 1rem;
}

.cs-section-label::before {
  content: "";
  display: inline-block;
  width: 1.3em;
  height: 2px;
  background: var(--accent);
}

.cs-section-title {
  font-family: var(--serif);
  font-size: 1.75rem;
  letter-spacing: -0.015em;
  line-height: 1.15;
  color: var(--ink);
  margin-bottom: 1rem;
}

.cs-body {
  font-size: 1rem;
  font-weight: 300;
  color: var(--mid);
  line-height: 1.85;
  margin-bottom: 1rem;
}

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

/* ── Process lanes ── */
.cs-process {
  display: flex;
  flex-direction: column;
  gap: 0;
  margin-top: 1.5rem;
}

.cs-process-lane {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 2rem;
  padding: 1.75rem 0;
  border-top: 1px solid var(--rule);
}

.cs-process-lane:last-child {
  border-bottom: 1px solid var(--rule);
}

.cs-lane-label {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink);
  padding-top: 0.1rem;
}

.cs-lane-body {
  font-size: 0.9375rem;
  font-weight: 300;
  color: var(--mid);
  line-height: 1.75;
}

/* ── Image / artifact blocks ── */
.cs-image-block {
  margin: 2.5rem 0;
}

.cs-image-block img {
  width: 100%;
  border-radius: 2px;
  display: block;
}

.cs-image-caption {
  font-size: 0.8rem;
  font-weight: 400;
  color: var(--mid);
  margin-top: 0.6rem;
  font-style: italic;
}

/* ── Callout / pull quote ── */
.cs-callout {
  border-left: 2px solid var(--accent);
  padding: 0.25rem 0 0.25rem 1.5rem;
  margin: 2.5rem 0;
}

.cs-callout p {
  font-family: var(--serif);
  font-size: 1.3rem;
  line-height: 1.4;
  color: var(--ink);
  letter-spacing: -0.01em;
}

/* ── Outcome metrics ── */
.cs-metrics {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 1.5rem;
  margin-top: 1.5rem;
}

.cs-metric {
  padding: 1.5rem;
  background: var(--rule);
  border-radius: 2px;
}

.cs-metric-value {
  font-family: var(--serif);
  font-size: 2.25rem;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--accent);
  margin-bottom: 0.4rem;
}

.cs-metric-label {
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--mid);
}

/* ── Divider ── */
.cs-divider {
  width: 100%;
  height: 1px;
  background: var(--rule);
  margin: 3rem 0;
}

/* ── Next project nav ── */
.cs-next {
  padding-top: 4rem;
  border-top: 1px solid var(--rule);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.cs-next-label {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--mid);
  margin-bottom: 0.5rem;
}

.cs-next-link {
  font-family: var(--serif);
  font-size: 1.4rem;
  letter-spacing: -0.01em;
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--rule);
  padding-bottom: 2px;
  transition: border-color 0.2s;
}

.cs-next-link:hover { border-color: var(--accent); color: var(--accent); }

/* ── Responsive ── */
@media (max-width: 768px) {
  .cs-page { padding: 7rem 1.5rem 5rem; }

  .cs-process-lane {
    grid-template-columns: 1fr;
    gap: 0.5rem;
  }

  .cs-next { flex-direction: column; align-items: flex-start; gap: 2rem; }
}