/* ═══════════════════════════════════════════════════════════
   Case Studies — Accordion Cards
   ═══════════════════════════════════════════════════════════ */

.case-studies-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

.case-studies-grid > .section-sub { grid-column: 1 / -1; }

.case-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 12px;
  overflow: hidden;
  transition: border-color 0.3s;
}

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

.case-card-header {
  padding: 2rem;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
}

.case-card-tag {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-glow);
  padding: 0.25rem 0.6rem;
  border-radius: 3px;
  margin-bottom: 0.75rem;
}

.case-card-header h3 {
  font-family: var(--font-display);
  font-size: 1.2rem;
  color: var(--white);
  margin-bottom: 0.35rem;
}

.case-card-client {
  font-size: 0.82rem;
  color: var(--text-tertiary);
}

.case-card-toggle {
  width: 32px;
  height: 32px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: none;
  color: var(--text-tertiary);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  flex-shrink: 0;
  margin-top: 0.25rem;
  transition: all 0.3s;
}

.case-card-toggle svg {
  width: 14px;
  height: 14px;
  stroke: currentColor;
  fill: none;
  stroke-width: 2;
  transition: transform 0.3s var(--ease-out);
}

.case-card.open .case-card-toggle svg { transform: rotate(180deg); }
.case-card.open .case-card-toggle     { border-color: var(--accent); color: var(--accent); }

.case-card-body {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.5s var(--ease-out);
}

.case-card.open .case-card-body { max-height: 800px; }

.case-card-content {
  padding: 0 2rem 2rem;
  border-top: 1px solid var(--border-subtle);
}

.case-card-content h4 {
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent);
  margin-top: 1.5rem;
  margin-bottom: 0.5rem;
}

.case-card-content p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

.case-points {
  list-style: none;
  margin: 0.8rem 0 0;
  padding: 0;
}

.case-points li {
  position: relative;
  padding: 0.25rem 0 0.25rem 1rem;
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.55;
}

.case-points li::before {
  content: '\2022';
  position: absolute;
  left: 0;
  color: var(--accent-dim);
}

.case-metrics {
  display: flex;
  gap: 2rem;
  margin-top: 1.25rem;
  flex-wrap: wrap;
}

.case-metric { text-align: center; }

.case-metric .metric-value {
  font-family: var(--font-display);
  font-size: 1.5rem;
  color: var(--accent);
  line-height: 1;
  margin-bottom: 0.25rem;
}

.case-metric .metric-label {
  font-size: 0.75rem;
  color: var(--text-tertiary);
}

.case-card-quote {
  margin-top: 1.25rem;
  padding: 1rem 1.25rem;
  background: var(--bg-elevated);
  border-radius: 8px;
  border-left: 2px solid var(--accent-dim);
}

.case-card-quote p {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 0.88rem;
  color: var(--text-primary);
  line-height: 1.6;
}

.case-card-quote cite {
  font-style: normal;
  font-family: var(--font-body);
  font-size: 0.78rem;
  color: var(--text-tertiary);
  display: block;
  margin-top: 0.5rem;
}

/* ─── Responsive ─── */
@media (max-width: 968px) {
  .case-studies-grid { grid-template-columns: 1fr; }
  .case-card-header { padding: 1.5rem; }
  .case-card-content { padding: 0 1.5rem 1.5rem; }
  .case-metrics {
    gap: 0.85rem;
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .case-metric { text-align: left; }
}

@media (max-width: 640px) {
  .case-card-header h3 { font-size: 1.08rem; }
  .case-card-client { font-size: 0.78rem; }
  .case-card-toggle {
    width: 30px;
    height: 30px;
    margin-top: 0;
  }
  .case-card-content h4 { margin-top: 1.15rem; }
  .case-card-content p,
  .case-points li { font-size: 0.86rem; }
  .case-metrics { grid-template-columns: 1fr; }
}

@media (min-width: 1440px) {
  .case-card-header    { padding: 2.25rem; }
  .case-card-header h3 { font-size: 1.35rem; }
  .case-card-content   { padding: 0 2.25rem 2.25rem; }
}