diff --git a/packages/cli/src/compiler.ts b/packages/cli/src/compiler.ts
index 6458764..c2366ea 100644
--- a/packages/cli/src/compiler.ts
+++ b/packages/cli/src/compiler.ts
@@ -180,14 +180,14 @@ export const AgentFacts: React.FC = () => {
           margin: '24px 0',
         }}
       >
-        <h2 style={{ fontSize: '20px', fontWeight: 600 }}>${config.entity.name} — Verified Specifications</h2>
+        <h2 style={{ fontSize: '20px', fontWeight: 600 }}>{${JSON.stringify(`${config.entity.name} — Verified Specifications`)}}</h2>
         <p style={{ margin: '8px 0', color: '#4b5563' }}>
-          ${primaryOffer?.quotableSummary || ''}
+          {${JSON.stringify(primaryOffer?.quotableSummary || '')}}
         </p>
         <div style={{ marginTop: '12px' }}>
           <strong>Boundaries & Constraints:</strong>
           <ul style={{ margin: '8px 0 0 20px', color: '#b91c1c' }}>
-            ${boundaries.map((b) => `<li>${b}</li>`).join('\n            ')}
+            ${boundaries.map((b) => `<li>{${JSON.stringify(b)}}</li>`).join('\n            ')}
           </ul>
         </div>
         <small style={{ color: '#9ca3af', display: 'block', marginTop: '12px' }}>
@@ -211,12 +211,12 @@ const jsonLd = ${JSON.stringify(jsonLdString)};
 <script type="application/ld+json" set:html={jsonLd} />
 
 <section data-agent-section="brand-facts" class="agentlens-facts">
-  <h2>${config.entity.name} — Verified Specifications</h2>
-  <p>${primaryOffer?.quotableSummary || ''}</p>
+  <h2>{${JSON.stringify(`${config.entity.name} — Verified Specifications`)}}</h2>
+  <p>{${JSON.stringify(primaryOffer?.quotableSummary || '')}}</p>
   <div class="agentlens-boundaries">
     <strong>Boundaries & Constraints:</strong>
     <ul>
-      ${boundaries.map((b) => `<li>${b}</li>`).join('\n      ')}
+      ${boundaries.map((b) => `<li>{${JSON.stringify(b)}}</li>`).join('\n      ')}
     </ul>
   </div>
   <small>Verified as of: ${timestamp.split('T')[0]}</small>
diff --git a/packages/cli/test/cli.test.ts b/packages/cli/test/cli.test.ts
index 0d8234e..88217de 100644
--- a/packages/cli/test/cli.test.ts
+++ b/packages/cli/test/cli.test.ts
@@ -155,6 +155,18 @@ describe('agentlens CLI — Compiler Engine', () => {
     expect(llmsTxt).toContain('## Boundaries & Negative Constraints (ncs:v1)');
     expect(llmsTxt).toContain('WATERPROOF');
 
+    // Verify generated React component wraps strings safely in JSX expressions
+    const reactComponentPath = path.join(tmpDir, 'components', 'AgentFacts.tsx');
+    expect(fs.existsSync(reactComponentPath)).toBe(true);
+    const reactContent = fs.readFileSync(reactComponentPath, 'utf8');
+    expect(reactContent).toContain('{"TestCorp — Verified Specifications"}');
+
+    // Verify generated Astro component wraps strings safely
+    const astroComponentPath = path.join(tmpDir, 'components', 'AgentFacts.astro');
+    expect(fs.existsSync(astroComponentPath)).toBe(true);
+    const astroContent = fs.readFileSync(astroComponentPath, 'utf8');
+    expect(astroContent).toContain('{"TestCorp — Verified Specifications"}');
+
     // Clean up
     fs.rmSync(tmpDir, { recursive: true, force: true });
   });
diff --git a/packages/core/src/differ.ts b/packages/core/src/differ.ts
index fed16b2..cf7ebd9 100644
--- a/packages/core/src/differ.ts
+++ b/packages/core/src/differ.ts
@@ -171,12 +171,24 @@ function extractElements(html: string): ElementTagInfo[] {
   return results;
 }
 
-function buildCssSelector(el: ElementTagInfo): string {
-  if (el.id) return `#${el.id}`;
+/**
+ * Robust CSS selector builder that produces valid CSS selectors for any
+ * class names (including Tailwind classes with slashes or brackets) and numeric IDs.
+ */
+export function buildCssSelector(el: { tag: string; id?: string; className?: string }): string {
+  if (el.id) {
+    if (/^[a-zA-Z_][a-zA-Z0-9_-]*$/.test(el.id)) {
+      return `#${el.id}`;
+    }
+    return `[id="${el.id.replace(/["\\]/g, '\\$&')}"]`;
+  }
   if (el.className) {
     const firstClass = el.className.trim().split(/\s+/)[0];
-    if (firstClass && !firstClass.includes(':')) {
-      return `${el.tag}.${firstClass}`;
+    if (firstClass) {
+      if (/^[a-zA-Z_][a-zA-Z0-9_-]*$/.test(firstClass)) {
+        return `${el.tag}.${firstClass}`;
+      }
+      return `${el.tag}[class~="${firstClass.replace(/["\\]/g, '\\$&')}"]`;
     }
   }
   return el.tag;
diff --git a/packages/core/src/scorer.ts b/packages/core/src/scorer.ts
index 6840356..343f1d3 100644
--- a/packages/core/src/scorer.ts
+++ b/packages/core/src/scorer.ts
@@ -33,8 +33,14 @@ export interface AuditInput {
 
 export function auditAndScore(input: AuditInput): AgentLensReport {
   const startTime = Date.now();
-  const urlObj = new URL(input.targetUrl);
-  const pathname = urlObj.pathname || '/';
+  let pathname = '/';
+  try {
+    const urlObj = new URL(input.targetUrl);
+    // RFC 9309 Section 2.2.2: path comparison matches against path and query components
+    pathname = `${urlObj.pathname || '/'}${urlObj.search || ''}`;
+  } catch {
+    pathname = input.targetUrl.startsWith('/') ? input.targetUrl : `/${input.targetUrl}`;
+  }
 
   const rawHtml = input.rawHtml || '';
   const hydratedHtml = input.hydratedHtml || rawHtml;
diff --git a/packages/core/test/core.test.ts b/packages/core/test/core.test.ts
index b39195b..a422493 100644
--- a/packages/core/test/core.test.ts
+++ b/packages/core/test/core.test.ts
@@ -282,4 +282,40 @@ describe('Full 7-Pillar Deterministic Scorer', () => {
     expect(report.pillars.renderParity.score).toBe(100);
     expect(report.deductions.length).toBeGreaterThanOrEqual(0);
   });
+
+  it('preserves query parameters in robots.txt matching per RFC 9309', () => {
+    const robotsTxt = `
+User-agent: *
+Disallow: /*?variant=
+Allow: /
+`;
+    // URL with query parameter should trigger Disallow
+    const reportBlocked = auditAndScore({
+      targetUrl: 'https://garuda.shoes/products?variant=123',
+      rawHtml: '<main><h1>Products</h1></main>',
+      robotsTxt,
+    });
+    expect(reportBlocked.pillars.robots.deductions.length).toBeGreaterThan(0);
+
+    // URL without query parameter should be Allowed
+    const reportAllowed = auditAndScore({
+      targetUrl: 'https://garuda.shoes/products',
+      rawHtml: '<main><h1>Products</h1></main>',
+      robotsTxt,
+    });
+    expect(reportAllowed.pillars.robots.deductions.length).toBe(0);
+  });
+});
+
+describe('CSS Selector Escaping (differ.ts)', () => {
+  it('generates valid CSS selectors for Tailwind classes and numeric IDs', async () => {
+    const { buildCssSelector } = await import('../src/index.js');
+
+    expect(buildCssSelector({ tag: 'span', className: 'w-1/2' })).toBe('span[class~="w-1/2"]');
+    expect(buildCssSelector({ tag: 'div', className: 'text-[14px]' })).toBe('div[class~="text-[14px]"]');
+    expect(buildCssSelector({ tag: 'button', className: 'p-2.5' })).toBe('button[class~="p-2.5"]');
+    expect(buildCssSelector({ tag: 'div', id: '123-product' })).toBe('[id="123-product"]');
+    expect(buildCssSelector({ tag: 'section', id: 'pricing' })).toBe('#pricing');
+    expect(buildCssSelector({ tag: 'p', className: 'description' })).toBe('p.description');
+  });
 });