/* ===== CASE STUDY ===== */
.casestudy-section {
  background:
    radial-gradient(ellipse at 30% 50%, #4a9eff06 0%, transparent 50%),
    linear-gradient(180deg, var(--bg) 0%, var(--bg-mid) 100%);
}

.stats-bar {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-bottom: 40px;
}

@media (max-width: 768px) {
  .stats-bar { grid-template-columns: repeat(2, 1fr); }
}

.stat-tile {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px 20px;
  text-align: center;
  box-shadow: var(--shadow);
  transition: all 0.25s ease;
}
.stat-tile:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.stat-tile .big {
  font-size: clamp(36px, 4vw, 52px);
  font-weight: 900;
  line-height: 1;
  margin-bottom: 6px;
  letter-spacing: -1px;
}

.stat-tile .desc {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.4;
}

.case-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 14px;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.case-header {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 20px 28px;
  background: linear-gradient(135deg, var(--bg-card) 0%, #1f2338 100%);
  border-bottom: 1px solid var(--border);
}

.case-header .logo-mark {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: linear-gradient(135deg, #4a9eff 0%, #7c3aed 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  font-weight: 900;
  color: white;
  flex-shrink: 0;
}

.case-header h3 {
  font-size: 18px;
  font-weight: 700;
}

.case-header .case-meta {
  font-size: 12px;
  color: var(--text-dim);
  margin-top: 2px;
}

.case-body {
  padding: 28px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
}

@media (max-width: 768px) {
  .case-body { grid-template-columns: 1fr; }
}

.case-col h4 {
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  margin-bottom: 14px;
}

.case-col h4.red { color: var(--red-light); }
.case-col h4.green { color: var(--green); }
.case-col h4.blue { color: var(--blue); }
.case-col h4.orange { color: var(--orange); }

.case-tree {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.case-tree-row {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  background: rgba(255,255,255,0.03);
  border-radius: 6px;
  border: 1px solid transparent;
  transition: all 0.2s;
}

.case-tree-row:hover {
  border-color: var(--border);
  background: rgba(255,255,255,0.06);
}

.case-tree-row .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

.case-tree-row .file {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11.5px;
  color: var(--text);
  font-weight: 500;
}

.case-tree-row .count {
  margin-left: auto;
  font-size: 11px;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 10px;
  white-space: nowrap;
}

.case-tree-row .count.red { background: #e74c3c22; color: var(--red-light); }
.case-tree-row .count.blue { background: #4a9eff22; color: var(--blue); }
.case-tree-row .count.green { background: #2ecc7122; color: var(--green); }

.case-tree-row.indent { margin-left: 20px; }
.case-tree-row.indent-2 { margin-left: 40px; }

.case-tree-note {
  margin-top: 10px;
  padding: 8px 12px;
  font-size: 12px;
  color: var(--text-dim);
  font-style: italic;
  border-top: 1px dashed var(--border);
  padding-top: 10px;
}

.case-lessons {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.case-lesson {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 10px 12px;
  background: rgba(255,255,255,0.03);
  border-radius: 6px;
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.5;
}

.case-lesson .icon {
  font-size: 16px;
  flex-shrink: 0;
  margin-top: 1px;
}

.case-lesson code {
  background: #1c2128;
  border-radius: 3px;
  padding: 1px 5px;
  font-size: 11.5px;
  color: var(--text);
}

.case-footer {
  padding: 16px 28px;
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 13px;
  color: var(--text-dim);
  background: rgba(255,255,255,0.015);
}

.case-footer .pulse {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--green);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; box-shadow: 0 0 0 0 rgba(46,204,113,0.4); }
  50% { opacity: 0.8; box-shadow: 0 0 0 6px rgba(46,204,113,0); }
}