.concept-card {
  background: #1a1a1a;
  border: 1px solid #2a2a2a;
  border-radius: 1.2rem;
  padding: 1rem 1.2rem;
  margin: 0;
  transition: border-color 0.2s;
}

.concept-card:hover { border-color: #214E34; }

.concept-card h3 {
  margin: 0 0 0.4rem 0;
  color: #7DC89A;
}

.concept-card p {
  margin: 0;
  font-size: 0.95rem;
}

.q-table-wrapper {
  overflow-x: auto;
  margin: 0.8rem 0 1.5rem 0;
  border-radius: 0.8rem;
  background: #1a1a1a;
}

.q-table-fraud {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  font-size: 0.9rem;
  min-width: 400px;
}

.q-row {
  display: grid;
  grid-template-columns: 120px 1fr 1fr 1fr;
  align-items: center;
  gap: 0.5rem;
  padding: 0.1rem 0.3rem;
}

.q-row.q-header {
  font-weight: 600;
  color: #cbd5e1;
  border-bottom: 2px solid #2a2a2a;
  padding-bottom: 0.3rem;
}

.q-cell {
  background: #0f0f0f;
  padding: 0.3rem 0.6rem;
  border-radius: 8px;
  text-align: center;
  border: 1px solid #2a2a2a;
  color: #e0e0e0;
}

.q-cell.max {
  background: #0D2419;
  border-color: #214E34;
  font-weight: 600;
  color: #7DC89A;
}

.badge {
  display: inline-block;
  padding: 0.1rem 0.7rem;
  border-radius: 30px;
  font-size: 0.7rem;
  font-weight: 600;
  background: #1a1a1a;
  color: #e0e0e0;
  border: 1px solid #2a2a2a;
}

.badge.green { background: #0f2a1a; color: #86d9a0; border-color: #2a4a3a; }
.badge.red   { background: #2a0f0f; color: #f8a0a0; border-color: #4a2a2a; }
.badge.blue  { background: #0f1a2a; color: #8bbaff; border-color: #2a3a4a; }

.diagram-box {
  background: #1a1a1a;
  border: 1px solid #2a2a2a;
  border-radius: 1.2rem;
  padding: 1rem;
  text-align: center;
  margin: 1rem 0 1.5rem 0;
}

.diagram-box img {
  max-width: 100%;
  height: auto;
  border-radius: 0.5rem;
}