/* ==========================================================================
   Platform v3.2.0 Explainable Calculation Experience (ECE) Stylesheet
   ========================================================================== */

.ece-container {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 2rem;
  margin-bottom: 2.5rem;
}

.ece-section-title {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 1.25rem;
  letter-spacing: -0.02em;
}

.ece-formula-visual-box {
  background: var(--gray-900);
  color: #ffffff;
  padding: 1.25rem 1.5rem;
  border-radius: var(--radius-lg);
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.1rem;
  border-left: 4px solid var(--primary-500);
  margin-bottom: 1.5rem;
}

.ece-steps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
  margin-bottom: 2rem;
}

.ece-step-card {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1rem;
}

.ece-step-num {
  font-size: 0.75rem;
  font-weight: 800;
  color: var(--primary-600);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.35rem;
}

.ece-step-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 0.35rem;
}

.ece-step-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.ece-industry-grid, .ece-examples-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-bottom: 2rem;
}

.ece-card {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1rem 1.25rem;
}

.ece-card-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 0.5rem;
}

.ece-mistake-card {
  background: #fff5f5;
  border: 1px solid #fecaca;
  border-left: 4px solid #ef4444;
  border-radius: var(--radius-md);
  padding: 1rem 1.25rem;
  margin-bottom: 1rem;
}

.ece-mistake-problem {
  font-weight: 700;
  color: #991b1b;
  margin-bottom: 0.35rem;
}

.ece-glossary-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  margin-top: 1.5rem;
}

.ece-glossary-item {
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0.85rem;
}

.ece-glossary-term {
  font-weight: 700;
  font-size: 0.875rem;
  color: var(--primary-700);
  margin-bottom: 0.25rem;
}

@media (max-width: 768px) {
  .ece-industry-grid, .ece-examples-grid {
    grid-template-columns: 1fr;
  }
}