/* ===== ARCHITECTURE LAYERS ===== */
.layers-flow {
  display: flex;
  align-items: stretch;
  gap: 0;
  margin-top: 48px;
  position: relative;
}

.layer-card {
  flex: 1;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 36px 28px;
  display: flex;
  flex-direction: column;
  min-height: 420px;
  position: relative;
  transition: all .3s;
}

.layer-card:hover {
  border-color: var(--primary-medium);
  box-shadow: var(--shadow-lg);
}

.layer-number {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--primary);
  color: var(--primary-text);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1.25rem;
  margin-bottom: 20px;
}

[data-theme="dark"] .layer-number { color: var(--primary-text); }

.layer-icon {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--primary-soft);
  color: var(--primary);
  margin-bottom: 16px;
}

.layer-icon svg {
  width: 26px;
  height: 26px;
}

.layer-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.layer-desc {
  color: var(--text-secondary);
  font-size: .95rem;
  line-height: 1.6;
  margin-bottom: 24px;
}

.layer-features {
  display: flex;
  flex-direction: column;
  gap: 10px;
  flex: 1;
}

.layer-features li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: .85rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.layer-features li svg {
  width: 16px;
  height: 16px;
  color: var(--primary);
  flex-shrink: 0;
  margin-top: 2px;
}

.layer-arrow {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 60px;
  color: var(--primary);
  font-size: 1.5rem;
  font-weight: 700;
  flex-shrink: 0;
}

.layer-arrow::before {
  content: '→';
  display: inline-block;
  animation: arrowPulse 2s ease-in-out infinite;
}

@keyframes arrowPulse {
  0%, 100% { transform: translateX(0); }
  50% { transform: translateX(8px); }
}

@media (max-width: 1024px) {
  .layers-flow { flex-direction: column; }
  .layer-arrow {
    transform: rotate(90deg);
    width: auto;
    height: 40px;
    order: -1;
  }
  .layer-card { min-height: auto; padding: 28px 24px; }
}

@media (max-width: 480px) {
  .layer-card { padding: 24px 20px; }
}