.security-section { margin-bottom: 2.5rem; }
    .security-section h2 {
      font-size: 1.1rem;
      font-weight: 700;
      color: #434b56;
      margin-bottom: 0.8rem;
      padding-bottom: 0.4rem;
      border-bottom: 1px solid var(--color-border);
    }
    .security-section h3 {
      font-size: 0.95rem;
      font-weight: 600;
      margin: 1rem 0 0.4rem;
    }
    .security-section p, .security-section li {
      font-size: 0.9rem;
      line-height: 1.9;
      color: var(--color-text);
    }
    .security-section ul {
      padding-left: 1.2rem;
      margin: 0.5rem 0;
    }
    .security-section li {
      margin-bottom: 0.3rem;
    }
    .diagram {
      background: var(--color-surface);
      border: 1px solid var(--color-border);
      border-radius: var(--radius);
      padding: 1rem 1.2rem;
      margin: 1rem 0;
      font-family: 'Consolas', 'Courier New', monospace;
      font-size: 0.8rem;
      line-height: 1.6;
      overflow-x: auto;
      white-space: pre;
      color: var(--color-text-muted);
    }
    .highlight-box {
      background: #f0f2f5;
      border: 1px solid var(--color-border);
      border-radius: var(--radius);
      padding: 1rem 1.2rem;
      margin: 1rem 0;
      font-size: 0.88rem;
      line-height: 1.7;
    }