diff --git a/src/commands/encrypt-file.ts b/src/commands/encrypt-file.ts
index 19ec47d..2a9df6e 100644
--- a/src/commands/encrypt-file.ts
+++ b/src/commands/encrypt-file.ts
@@ -6,7 +6,7 @@
  * The file name does NOT change. The content is replaced with OCKE binary format.
  */
 
-import { Notice, Plugin, FuzzySuggestModal } from 'obsidian';
+import { App, Notice, Plugin, FuzzySuggestModal } from 'obsidian';
 import type { CryptoEngine, EncryptionContext, PluginSettings } from '../types';
 import { FORMAT_VERSION, KMS_FILE_TIMEOUT_MS, NOTICE_DURATION_MS } from '../constants';
 import { serialize } from '../format/serializer';
@@ -82,13 +82,13 @@ async function executeEncryptFile(
     await doEncrypt(plugin, cryptoEngine, file.path, contentBytes, arn);
   } else {
     // Multiple keys — show picker
-    new KeyPickerModal(plugin.app, aliases, async (chosen) => {
+    new KeyPickerModal(plugin.app, aliases, (chosen) => {
       const arn = resolveKeyArn(chosen, settings);
       if (!arn) {
         new Notice(`Key "${chosen}" has no valid ARN.`, NOTICE_DURATION_MS);
         return;
       }
-      await doEncrypt(plugin, cryptoEngine, file.path, contentBytes, arn);
+      void doEncrypt(plugin, cryptoEngine, file.path, contentBytes, arn);
     }).open();
   }
 }
@@ -141,7 +141,7 @@ class KeyPickerModal extends FuzzySuggestModal<string> {
   private readonly aliases: string[];
   private readonly onChoose: (alias: string) => void;
 
-  constructor(app: any, aliases: string[], onChoose: (alias: string) => void) {
+  constructor(app: App, aliases: string[], onChoose: (alias: string) => void) {
     super(app);
     this.aliases = aliases;
     this.onChoose = onChoose;
diff --git a/src/commands/encrypt-selection.ts b/src/commands/encrypt-selection.ts
index c900837..a19fe9c 100644
--- a/src/commands/encrypt-selection.ts
+++ b/src/commands/encrypt-selection.ts
@@ -6,7 +6,7 @@
  * The actual encryption happens transparently via the adapter patch on save.
  */
 
-import { Notice, Plugin, MarkdownView, FuzzySuggestModal } from 'obsidian';
+import { App, Editor, Notice, Plugin, MarkdownView, FuzzySuggestModal } from 'obsidian';
 import type { CryptoEngine, PluginSettings } from '../types';
 import { MAX_SELECTION_CHARS, NOTICE_DURATION_MS } from '../constants';
 import { getKeyAliases } from '../utils/key-resolver';
@@ -37,7 +37,7 @@ function executeWrapSelection(plugin: Plugin, getSettings: () => PluginSettings)
     return;
   }
 
-  const editor = markdownView.editor;
+  const editor: Editor = markdownView.editor;
   const selection = editor.getSelection();
 
   if (!selection || selection.length === 0) {
@@ -68,7 +68,7 @@ function executeWrapSelection(plugin: Plugin, getSettings: () => PluginSettings)
   }
 }
 
-function wrapWithAlias(editor: any, selection: string, alias: string | undefined): void {
+function wrapWithAlias(editor: Editor, selection: string, alias: string | undefined): void {
   const startMarker = alias ? `%%secret-start:${alias}%%` : '%%secret-start%%';
   const secretBlock = `${startMarker}\n${selection}\n%%secret-end%%`;
   editor.replaceSelection(secretBlock);
@@ -81,7 +81,7 @@ class KeyPickerModal extends FuzzySuggestModal<string> {
   private readonly aliases: string[];
   private readonly onChoose: (alias: string) => void;
 
-  constructor(app: any, aliases: string[], onChoose: (alias: string) => void) {
+  constructor(app: App, aliases: string[], onChoose: (alias: string) => void) {
     super(app);
     this.aliases = aliases;
     this.onChoose = onChoose;
diff --git a/src/main.ts b/src/main.ts
index 5e5ec26..a7dc594 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -69,7 +69,7 @@ export default class CloudKmsPlugin extends Plugin {
     registerAttachmentHook(this, this.cryptoEngine, () => this.settings, this.bufferRegistry);
 
     // 9. File explorer badge for encrypted files
-    this.uninstallBadge = installFileExplorerBadge(this, this.originalReadBinary!);
+    this.uninstallBadge = installFileExplorerBadge(this, this.originalReadBinary);
 
     // 10. Status bar KMS indicator
     this.uninstallStatusBar = installStatusBar(this, () => this.settings);
@@ -78,7 +78,7 @@ export default class CloudKmsPlugin extends Plugin {
     registerEncryptedFileView(this);
   }
 
-  async onunload(): Promise<void> {
+  onunload(): void {
     // Restore original adapter methods
     if (this.uninstallAdapterPatch) {
       this.uninstallAdapterPatch();
diff --git a/src/ui/encrypted-view.ts b/src/ui/encrypted-view.ts
index 6f6708d..fe6ac52 100644
--- a/src/ui/encrypted-view.ts
+++ b/src/ui/encrypted-view.ts
@@ -10,7 +10,7 @@
  * or ciphertext integrity verification fails.
  */
 
-import { ItemView, Plugin, WorkspaceLeaf } from 'obsidian';
+import { ItemView, Plugin, WorkspaceLeaf, ViewStateResult } from 'obsidian';
 
 /** Unique view type identifier for the encrypted file read-only view. */
 export const ENCRYPTED_FILE_VIEW_TYPE = 'encrypted-file-view';
@@ -79,7 +79,7 @@ export class EncryptedFileView extends ItemView {
     };
   }
 
-  async setState(state: Partial<EncryptedFileViewState>, result: any): Promise<void> {
+  async setState(state: Partial<EncryptedFileViewState>, result: ViewStateResult): Promise<void> {
     if (state.filePath !== undefined) this.filePath = state.filePath;
     if (state.errorMessage !== undefined) this.errorMessage = state.errorMessage;
     if (state.rawContentBase64 !== undefined) this.rawContentBase64 = state.rawContentBase64;
@@ -191,8 +191,8 @@ export async function showEncryptedFileError(
 ): Promise<void> {
   // Build error message with category if available (PluginError)
   let errorMessage: string;
-  if ('category' in error && typeof (error as any).category === 'string') {
-    errorMessage = `[${(error as any).category}] ${error.message}`;
+  if ('category' in error && typeof (error as Record<string, unknown>).category === 'string') {
+    errorMessage = `[${(error as Record<string, unknown>).category}] ${error.message}`;
   } else {
     errorMessage = error.message || 'Decryption failed';
   }
diff --git a/src/ui/file-explorer-badge.ts b/src/ui/file-explorer-badge.ts
index 9f30bfc..b3ede7f 100644
--- a/src/ui/file-explorer-badge.ts
+++ b/src/ui/file-explorer-badge.ts
@@ -10,7 +10,7 @@ const encryptedPaths = new Set<string>();
 
 export function installFileExplorerBadge(
   plugin: Plugin,
-  originalReadBinary: (path: string) => Promise<ArrayBuffer>
+  originalReadBinary: ((path: string) => Promise<ArrayBuffer>) | undefined
 ): () => void {
   // Scan vault on layout ready
   plugin.app.workspace.onLayoutReady(async () => {
@@ -40,8 +40,9 @@ export function markFileDecrypted(filePath: string): void {
 
 async function scanVaultForEncryptedFiles(
   plugin: Plugin,
-  originalReadBinary: (path: string) => Promise<ArrayBuffer>
+  originalReadBinary: ((path: string) => Promise<ArrayBuffer>) | undefined
 ): Promise<void> {
+  if (!originalReadBinary) return;
   const files = plugin.app.vault.getFiles();
   for (const file of files) {
     if (file.path.endsWith('.md')) continue;
diff --git a/src/ui/status-bar.ts b/src/ui/status-bar.ts
index 1a83923..d598ae0 100644
--- a/src/ui/status-bar.ts
+++ b/src/ui/status-bar.ts
@@ -68,7 +68,7 @@ export function installStatusBar(
 
   // Check on click only (no periodic background checks)
   statusBarEl.addEventListener('click', () => {
-    checkStatus();
+    void checkStatus();
   });
 
   // Initial check after layout ready