diff --git a/web/components/chat/CitedChunks.tsx b/web/components/chat/CitedChunks.tsx
index df57ac7..25333ad 100644
--- a/web/components/chat/CitedChunks.tsx
+++ b/web/components/chat/CitedChunks.tsx
@@ -3,6 +3,8 @@
 import { useState } from "react"
 import { Badge } from "@/components/ui/badge"
 import { ChevronDown, ChevronRight, FileText } from "lucide-react"
+import { cn } from "@/lib/utils"
+import { levelTone } from "@/lib/log-levels"
 
 export type CitedChunk = {
   chunk_id: string
@@ -62,7 +64,7 @@ export function CitedChunks({
                   </Badge>
                 )}
                 {c.level && (
-                  <Badge variant="outline" className="px-1.5 py-0">
+                  <Badge variant="outline" className={cn("px-1.5 py-0", levelTone(c.level))}>
                     {c.level}
                   </Badge>
                 )}
diff --git a/web/components/chat/Timeline.tsx b/web/components/chat/Timeline.tsx
index 1414d0d..eb5505d 100644
--- a/web/components/chat/Timeline.tsx
+++ b/web/components/chat/Timeline.tsx
@@ -4,6 +4,7 @@ import { useState } from "react"
 import { Badge } from "@/components/ui/badge"
 import { ChevronDown, ChevronRight, Clock } from "lucide-react"
 import { cn } from "@/lib/utils"
+import { levelTone } from "@/lib/log-levels"
 
 export type TimelineEntry = {
   service: string | null
@@ -24,22 +25,6 @@ function formatRange(first: string, last: string): string {
   return `${formatTs(first)}–${formatTs(last)}`
 }
 
-function levelTone(level: string | null): string {
-  switch ((level || "").toUpperCase()) {
-    case "ERROR":
-    case "CRITICAL":
-    case "FATAL":
-      return "text-red-500 border-red-500/30"
-    case "WARNING":
-    case "WARN":
-      return "text-amber-500 border-amber-500/30"
-    case "INFO":
-      return "text-blue-500 border-blue-500/30"
-    default:
-      return "text-muted-foreground border-border"
-  }
-}
-
 // Optional controlled `open` so a parent (e.g. a quick-action button on the
 // assistant turn) can force the panel open. Falls back to uncontrolled
 // internal state when omitted.
diff --git a/web/components/investigation-step.tsx b/web/components/investigation-step.tsx
index 3973128..7fffae1 100644
--- a/web/components/investigation-step.tsx
+++ b/web/components/investigation-step.tsx
@@ -7,8 +7,18 @@ import { Spinner } from "@/components/ui/spinner"
 import { Terminal, Brain, Search, ChevronDown, ChevronRight, Sparkles, Lightbulb, Flag } from "lucide-react"
 import { useState } from "react"
 import ReactMarkdown from "react-markdown"
-import { Prism as SyntaxHighlighter } from "react-syntax-highlighter"
-import { vscDarkPlus } from "react-syntax-highlighter/dist/esm/styles/prism"
+
+// Neutral JSON rendering — matches CitedChunks' raw-text styling so every
+// monospace panel in the app reads the same. Syntax-highlighting themes
+// (vscDarkPlus etc.) brought a full colour scheme into an otherwise
+// two-tone UI and ignored light/dark mode.
+function JsonBlock({ value }: { value: unknown }) {
+  return (
+    <pre className="font-mono text-[11px] whitespace-pre-wrap break-all leading-snug text-foreground/85 m-0">
+      {JSON.stringify(value, null, 2)}
+    </pre>
+  )
+}
 
 export function InvestigationStepCard({ step }: { step: Step }) {
   const [showTool, setShowTool] = useState(false)
@@ -79,7 +89,7 @@ export function InvestigationStepCard({ step }: { step: Step }) {
 
         {/* Action/Tool Call */}
         {step.action && (
-          <div className="ml-8 border rounded-md overflow-hidden bg-card/50">
+          <div className="ml-8 border rounded-lg overflow-hidden bg-card/50">
             <button
               onClick={() => setShowTool(!showTool)}
               className="w-full flex items-center justify-between p-2 px-3 text-xs font-mono bg-muted/50 hover:bg-muted transition-colors"
@@ -93,13 +103,7 @@ export function InvestigationStepCard({ step }: { step: Step }) {
             </button>
             {showTool && (
               <div className="p-3 bg-muted/20">
-                <SyntaxHighlighter
-                  language="json"
-                  style={vscDarkPlus}
-                  customStyle={{ margin: 0, padding: 0, background: 'transparent', fontSize: '11px' }}
-                >
-                  {JSON.stringify(step.action.args, null, 2)}
-                </SyntaxHighlighter>
+                <JsonBlock value={step.action.args} />
               </div>
             )}
           </div>
@@ -107,7 +111,7 @@ export function InvestigationStepCard({ step }: { step: Step }) {
 
         {/* Observation */}
         {step.observation && (
-          <div className="ml-8 border rounded-md overflow-hidden bg-card/50">
+          <div className="ml-8 border rounded-lg overflow-hidden bg-card/50">
             <button
               onClick={() => setShowObservation(!showObservation)}
               className="w-full flex items-center justify-between p-2 px-3 text-xs font-mono bg-muted/50 hover:bg-muted transition-colors"
@@ -125,13 +129,7 @@ export function InvestigationStepCard({ step }: { step: Step }) {
             </button>
             {showObservation && (
               <div className="max-h-[300px] overflow-auto p-3 bg-muted/20">
-                <SyntaxHighlighter
-                  language="json"
-                  style={vscDarkPlus}
-                  customStyle={{ margin: 0, padding: 0, background: 'transparent', fontSize: '11px' }}
-                >
-                  {JSON.stringify(step.observation, null, 2)}
-                </SyntaxHighlighter>
+                <JsonBlock value={step.observation} />
               </div>
             )}
           </div>
diff --git a/web/lib/log-levels.ts b/web/lib/log-levels.ts
new file mode 100644
index 0000000..15c97ed
--- /dev/null
+++ b/web/lib/log-levels.ts
@@ -0,0 +1,19 @@
+// Single source of truth for log-level badge styling, shared by every panel
+// that renders a level (Timeline, CitedChunks, …) so they can't drift apart.
+//
+// Deliberately minimal palette: theme `destructive` for error-class levels,
+// one amber accent for warnings, neutral for INFO and everything else —
+// INFO is the overwhelming majority of rows, so colouring it is pure noise.
+export function levelTone(level: string | null | undefined): string {
+  switch ((level || "").toUpperCase()) {
+    case "ERROR":
+    case "CRITICAL":
+    case "FATAL":
+      return "text-destructive border-destructive/30"
+    case "WARNING":
+    case "WARN":
+      return "text-amber-600 dark:text-amber-500 border-amber-500/30"
+    default:
+      return "text-muted-foreground border-border"
+  }
+}