diff --git a/src/lib/services/logger.ts b/src/lib/services/logger.ts
index 1b14781..a1da830 100644
--- a/src/lib/services/logger.ts
+++ b/src/lib/services/logger.ts
@@ -4,21 +4,23 @@
  * Browser-safe: falls back to console in browser environments
  */
 
-function createConsoleLogger() {
+import type { Logger } from '../types/logger.js';
+
+function createConsoleLogger(): Logger {
   return {
-    info: (...args: any[]) => console.log('[INFO]', ...args),
-    error: (...args: any[]) => console.error('[ERROR]', ...args),
-    warn: (...args: any[]) => console.warn('[WARN]', ...args),
-    debug: (...args: any[]) => console.debug('[DEBUG]', ...args),
-    trace: (...args: any[]) => console.trace('[TRACE]', ...args),
-    fatal: (...args: any[]) => console.error('[FATAL]', ...args)
+    info: (...args: unknown[]) => console.log('[INFO]', ...args),
+    error: (...args: unknown[]) => console.error('[ERROR]', ...args),
+    warn: (...args: unknown[]) => console.warn('[WARN]', ...args),
+    debug: (...args: unknown[]) => console.debug('[DEBUG]', ...args),
+    trace: (...args: unknown[]) => console.trace('[TRACE]', ...args),
+    fatal: (...args: unknown[]) => console.error('[FATAL]', ...args)
   };
 }
 
 // Check if we're in a Node.js environment
 const isNode = typeof process !== 'undefined' && process.versions?.node;
 
-let logger: any;
+let logger: Logger;
 
 if (isNode) {
   // Server-side: use pino
diff --git a/src/lib/services/nostr/nip19-utils.ts b/src/lib/services/nostr/nip19-utils.ts
index ce78ed9..eadf046 100644
--- a/src/lib/services/nostr/nip19-utils.ts
+++ b/src/lib/services/nostr/nip19-utils.ts
@@ -3,6 +3,7 @@
  */
 
 import { nip19 } from 'nostr-tools';
+import type { DecodedNevent, DecodedNaddr, DecodedNote } from '../../types/nip19.js';
 
 export interface DecodedEvent {
   type: 'nevent' | 'naddr' | 'note';
@@ -27,7 +28,7 @@ export function decodeNostrAddress(input: string): DecodedEvent | null {
     const decoded = nip19.decode(trimmed);
     
     if (decoded.type === 'nevent') {
-      const data = decoded.data as { id: string; pubkey?: string; relays?: string[] };
+      const data = decoded.data as DecodedNevent['data'];
       return {
         type: 'nevent',
         id: data.id,
@@ -35,7 +36,7 @@ export function decodeNostrAddress(input: string): DecodedEvent | null {
         relays: data.relays
       };
     } else if (decoded.type === 'naddr') {
-      const data = decoded.data as { pubkey: string; kind: number; identifier: string; relays?: string[] };
+      const data = decoded.data as DecodedNaddr['data'];
       return {
         type: 'naddr',
         pubkey: data.pubkey,
@@ -44,9 +45,10 @@ export function decodeNostrAddress(input: string): DecodedEvent | null {
         relays: data.relays
       };
     } else if (decoded.type === 'note') {
+      const data = decoded.data as DecodedNote['data'];
       return {
         type: 'note',
-        id: decoded.data as string
+        id: data
       };
     }
   } catch (e) {
diff --git a/src/lib/types/highlight-js.d.ts b/src/lib/types/highlight-js.d.ts
new file mode 100644
index 0000000..eecbe00
--- /dev/null
+++ b/src/lib/types/highlight-js.d.ts
@@ -0,0 +1,39 @@
+/**
+ * Type definitions for highlight.js
+ * These are minimal types for the parts we use
+ */
+
+declare module 'highlight.js' {
+  export interface HighlightResult {
+    value: string;
+    language?: string;
+    relevance?: number;
+  }
+
+  export interface HighlightOptions {
+    language?: string;
+    ignoreIllegals?: boolean;
+  }
+
+  export interface AutoHighlightResult extends HighlightResult {
+    secondBest?: HighlightResult;
+  }
+
+  export interface Language {
+    name?: string;
+    aliases?: string[];
+    keywords?: Record<string, any>;
+    contains?: any[];
+  }
+
+  export interface HLJSApi {
+    highlight(code: string, options: HighlightOptions): HighlightResult;
+    highlightAuto(code: string, options?: { languageSubset?: string[] }): AutoHighlightResult;
+    getLanguage(name: string): Language | undefined;
+    registerLanguage(name: string, language: (hljs: HLJSApi) => Language): void;
+    listLanguages(): string[];
+  }
+
+  const hljs: HLJSApi;
+  export default hljs;
+}
diff --git a/src/lib/types/logger.ts b/src/lib/types/logger.ts
new file mode 100644
index 0000000..18f8dc9
--- /dev/null
+++ b/src/lib/types/logger.ts
@@ -0,0 +1,13 @@
+/**
+ * Logger interface for consistent logging across the application
+ * Compatible with both pino (server-side) and console (browser-side)
+ */
+
+export interface Logger {
+  info(...args: unknown[]): void;
+  error(...args: unknown[]): void;
+  warn(...args: unknown[]): void;
+  debug(...args: unknown[]): void;
+  trace(...args: unknown[]): void;
+  fatal(...args: unknown[]): void;
+}
diff --git a/src/lib/types/nip19.ts b/src/lib/types/nip19.ts
new file mode 100644
index 0000000..147f626
--- /dev/null
+++ b/src/lib/types/nip19.ts
@@ -0,0 +1,80 @@
+/**
+ * Type definitions for NIP-19 bech32 encoded entities
+ * These types help with proper typing of nip19.decode() return values
+ */
+
+/**
+ * Decoded npub (public key)
+ */
+export interface DecodedNpub {
+  type: 'npub';
+  data: string; // hex pubkey
+}
+
+/**
+ * Decoded nsec (private key)
+ */
+export interface DecodedNsec {
+  type: 'nsec';
+  data: Uint8Array; // private key bytes
+}
+
+/**
+ * Decoded note (event ID)
+ */
+export interface DecodedNote {
+  type: 'note';
+  data: string; // hex event ID
+}
+
+/**
+ * Decoded nevent (event reference)
+ */
+export interface DecodedNevent {
+  type: 'nevent';
+  data: {
+    id: string; // hex event ID
+    pubkey?: string; // hex pubkey
+    relays?: string[]; // relay hints
+    kind?: number; // event kind
+  };
+}
+
+/**
+ * Decoded naddr (parameterized replaceable event)
+ */
+export interface DecodedNaddr {
+  type: 'naddr';
+  data: {
+    pubkey: string; // hex pubkey
+    kind: number; // event kind
+    identifier: string; // d-tag value
+    relays?: string[]; // relay hints
+  };
+}
+
+/**
+ * Union type for all decoded NIP-19 entities
+ */
+export type DecodedNip19 = DecodedNpub | DecodedNsec | DecodedNote | DecodedNevent | DecodedNaddr;
+
+/**
+ * Type guard to check if decoded value is an npub
+ */
+export function isDecodedNpub(decoded: DecodedNip19): decoded is DecodedNpub {
+  return decoded.type === 'npub';
+}
+
+/**
+ * Type guard to check if decoded value is a nevent
+ */
+export function isDecodedNevent(decoded: DecodedNip19): decoded is DecodedNevent {
+  return decoded.type === 'nevent';
+}
+
+/**
+ * Type guard to check if decoded value is an naddr
+ */
+export function isDecodedNaddr(decoded: DecodedNip19): decoded is DecodedNaddr {
+  return decoded.type === 'naddr';
+}
diff --git a/src/routes/+page.svelte b/src/routes/+page.svelte
index b15eafa..f8f80fc 100644
--- a/src/routes/+page.svelte
+++ b/src/routes/+page.svelte
@@ -311,8 +311,13 @@
       let queryHex = '';
       try {
         const decoded = nip19.decode(query);
-        if (decoded.type === 'naddr' || decoded.type === 'nevent') {
-          queryHex = (decoded.data as any).id || '';
+        if (decoded.type === 'nevent') {
+          const data = decoded.data as { id: string };
+          queryHex = data.id || '';
+        } else if (decoded.type === 'naddr') {
+          // For naddr, we can't extract an event ID directly, skip
+        } else if (decoded.type === 'note') {
+          queryHex = decoded.data as string;
         }
       } catch {
         // Not a bech32 encoded value
diff --git a/src/routes/docs/+page.svelte b/src/routes/docs/+page.svelte
index 354014a..29ea25b 100644
--- a/src/routes/docs/+page.svelte
+++ b/src/routes/docs/+page.svelte
@@ -14,7 +14,7 @@
         const hljsModule = await import('highlight.js');
         const hljs = hljsModule.default || hljsModule;
         
-        const md: any = new MarkdownIt({
+        const md = new MarkdownIt({
           highlight: function (str: string, lang: string): string {
             if (lang && hljs.getLanguage(lang)) {
               try {
diff --git a/src/routes/docs/nip34/+page.svelte b/src/routes/docs/nip34/+page.svelte
index aa0e7cf..baebff7 100644
--- a/src/routes/docs/nip34/+page.svelte
+++ b/src/routes/docs/nip34/+page.svelte
@@ -14,7 +14,7 @@
         const hljsModule = await import('highlight.js');
         const hljs = hljsModule.default || hljsModule;
         
-        const md: any = new MarkdownIt({
+        const md = new MarkdownIt({
           highlight: function (str: string, lang: string): string {
             if (lang && hljs.getLanguage(lang)) {
               try {
diff --git a/src/routes/docs/nip34/spec/+page.svelte b/src/routes/docs/nip34/spec/+page.svelte
index 9c51287..23c360a 100644
--- a/src/routes/docs/nip34/spec/+page.svelte
+++ b/src/routes/docs/nip34/spec/+page.svelte
@@ -14,7 +14,7 @@
         const hljsModule = await import('highlight.js');
         const hljs = hljsModule.default || hljsModule;
         
-        const md: any = new MarkdownIt({
+        const md = new MarkdownIt({
           highlight: function (str: string, lang: string): string {
             if (lang && hljs.getLanguage(lang)) {
               try {
diff --git a/src/routes/repos/[npub]/[repo]/+page.svelte b/src/routes/repos/[npub]/[repo]/+page.svelte
index fda2560..8d59154 100644
--- a/src/routes/repos/[npub]/[repo]/+page.svelte
+++ b/src/routes/repos/[npub]/[repo]/+page.svelte
@@ -128,7 +128,7 @@
             const hljsModule = await import('highlight.js');
             const hljs = hljsModule.default || hljsModule;
             
-            const md: any = new MarkdownIt({
+            const md = new MarkdownIt({
               highlight: function (str: string, lang: string): string {
                 if (lang && hljs.getLanguage(lang)) {
                   try {
@@ -212,7 +212,7 @@
       
       // Register AsciiDoc language if needed (not in highlight.js by default)
       if (lang === 'asciidoc' && !hljs.getLanguage('asciidoc')) {
-        hljs.registerLanguage('asciidoc', function(hljs: any) {
+        hljs.registerLanguage('asciidoc', function(hljs) {
           return {
             name: 'AsciiDoc',
             aliases: ['adoc', 'asciidoc', 'ad'],