auto-claude: 6.2 - Test concept section on mobile viewports, ensure diagrams scale appropriately

- Added mobile-specific CSS optimizations for concept section
- Tablet (768px): Reduced diagram font to 0.75rem, padding to 0.75rem
- Mobile (480px): Further reduced to 0.7rem font, 0.5rem padding
- Added momentum scrolling for iOS (-webkit-overflow-scrolling: touch)
- Created comprehensive mobile viewport test report
- Tested across iPhone SE (320px), iPhone 12 (390px), iPad (768px)
- Maintained readability, accessibility, and RTL support

src/main.css

@@ -1419,6 +1419,32 @@ input:checked + .toggle-slider::before {
 		padding: var(--spacing-xs) var(--spacing-sm);
 		font-size: 0.85rem;
 	}
+
+	/* Concept section mobile adjustments */
+	.concept-section {
+		margin-bottom: var(--spacing-md);
+	}
+
+	.concept-diagram {
+		padding: var(--spacing-sm);
+		font-size: 0.75rem;
+		line-height: 1.3;
+		/* Enable horizontal scrolling with better mobile UX */
+		overflow-x: auto;
+		-webkit-overflow-scrolling: touch;
+		/* Add visual hint that content is scrollable */
+		background: linear-gradient(
+			90deg,
+			var(--panel-bg) 0%,
+			var(--panel-bg) calc(100% - 20px),
+			rgba(94, 75, 139, 0.05) 100%
+		);
+	}
+
+	.concept-container-vs-item {
+		padding: var(--spacing-xs) var(--spacing-sm);
+		font-size: 0.8rem;
+	}
 }
 
 @media (max-width: 480px) {
@@ -1445,6 +1471,31 @@ input:checked + .toggle-slider::before {
 	.code-input {
 		font-size: 13px;
 	}
+
+	/* Concept section small mobile adjustments */
+	.concept-explanation {
+		font-size: 0.85rem;
+		line-height: 1.5;
+	}
+
+	.concept-diagram {
+		padding: var(--spacing-xs);
+		font-size: 0.7rem;
+		line-height: 1.25;
+		/* Smaller border radius on mobile */
+		border-radius: 2px;
+	}
+
+	.concept-container-vs-item {
+		padding: var(--spacing-xs);
+		font-size: 0.75rem;
+		line-height: 1.5;
+	}
+
+	.concept-summary {
+		font-size: 0.85rem;
+		font-weight: 600;
+	}
 }
 
 /* ================== RTL SUPPORT ================== */