```

refactor: compact block context menu styling and improve visual density

- Reduced menu width from 240px to 220px and decreased padding throughout for more compact layout
- Scaled down button sizes (p-2 → p-1.5), gaps (gap-3 → gap-2.5), and font sizes (text-base → text-sm)
- Shrunk color picker swatches from 7x7 to 5x5 with thinner ring borders for cleaner appearance
- Tightened spacing in toolbars, submenus, and all menu sections while maintaining usability
- Added opacity property binding

src/app/editor/components/block/block-context-menu.component.ts

@@ -3,6 +3,7 @@ import { CommonModule } from '@angular/common';
 import { Block, BlockType } from '../../core/models/block.model';
 import { DocumentService } from '../../services/document.service';
 import { CodeThemeService } from '../../services/code-theme.service';
+import { BlockMenuStylingService } from '../../services/block-menu-styling.service';
 
 export interface MenuAction {
   type: 'comment' | 'add' | 'convert' | 'background' | 'lineColor' | 'borderColor' | 'codeTheme' | 'codeLanguage' | 'copyCode' | 'toggleWrap' | 'toggleLineNumbers' | 'addCaption' | 'tableLayout' | 'copyTable' | 'filterTable' | 'importCSV' | 'tableHelp' | 'insertColumn' | 'imageAspectRatio' | 'imageAlignment' | 'imageDefaultSize' | 'imageReplace' | 'imageRotate' | 'imageSetPreview' | 'imageOCR' | 'imageDownload' | 'imageViewFull' | 'imageOpenTab' | 'imageInfo' | 'duplicate' | 'copy' | 'lock' | 'copyLink' | 'delete' | 'align' | 'indent';
@@ -17,7 +18,7 @@ export interface MenuAction {
     <div 
       *ngIf="visible"
       #menu
-      class="ctx fixed min-w-[240px] py-2"
+      class="ctx fixed min-w-[220px] py-1" [style.opacity]="opacity"
       [style.left.px]="left"
       [style.top.px]="top"
       role="menu"
@@ -26,11 +27,11 @@ export interface MenuAction {
       (contextmenu)="$event.preventDefault()"
     >
       <!-- Alignment toolbar (image has dedicated icons + size buttons). Non-image keeps generic align + indent. -->
-      <div class="flex items-center gap-1 px-3 py-2 border-b border-border">
+      <div class="flex items-center gap-0.5 px-2 py-1.5 border-b border-border">
         @if (block.type === 'image') {
           <!-- Image alignment: Left / Center / Right (custom icons like in ref) -->
           <button
-            class="p-2 rounded hover:bg-surface2 transition"
+            class="p-1.5 rounded hover:bg-surface2 transition"
             title="Align left"
             (click)="onAlignImage('left')"
           >
@@ -40,7 +41,7 @@ export interface MenuAction {
             </svg>
           </button>
           <button
-            class="p-2 rounded hover:bg-surface2 transition"
+            class="p-1.5 rounded hover:bg-surface2 transition"
             title="Align center"
             (click)="onAlignImage('center')"
           >
@@ -50,7 +51,7 @@ export interface MenuAction {
             </svg>
           </button>
           <button
-            class="p-2 rounded hover:bg-surface2 transition"
+            class="p-1.5 rounded hover:bg-surface2 transition"
             title="Align right"
             (click)="onAlignImage('right')"
           >
@@ -62,7 +63,7 @@ export interface MenuAction {
           <div class="w-px h-5 mx-1 bg-border"></div>
           <!-- Default size and Full width -->
           <button
-            class="p-2 rounded hover:bg-surface2 transition"
+            class="p-1.5 rounded hover:bg-surface2 transition"
             title="Default size"
             (click)="onImageDefaultSize()"
           >
@@ -72,7 +73,7 @@ export interface MenuAction {
             </svg>
           </button>
           <button
-            class="p-2 rounded hover:bg-surface2 transition"
+            class="p-1.5 rounded hover:bg-surface2 transition"
             title="Full width"
             (click)="onAction('imageAlignment', { alignment: 'full' })"
           >
@@ -84,7 +85,7 @@ export interface MenuAction {
         } @else {
           <button 
             *ngFor="let align of alignments"
-            class="p-2 rounded hover:bg-surface2 transition"
+            class="p-1.5 rounded hover:bg-surface2 transition"
             [title]="align.label"
             (click)="onAlign(align.value)"
           >
@@ -94,7 +95,7 @@ export interface MenuAction {
           </button>
           <div class="w-px h-5 mx-1 bg-border"></div>
           <button 
-            class="p-2 rounded hover:bg-surface2 transition"
+            class="p-1.5 rounded hover:bg-surface2 transition"
             title="Increase indent"
             (click)="onIndent(1)"
           >
@@ -106,7 +107,7 @@ export interface MenuAction {
             </svg>
           </button>
           <button 
-            class="p-2 rounded hover:bg-surface2 transition"
+            class="p-1.5 rounded hover:bg-surface2 transition"
             title="Decrease indent"
             (click)="onIndent(-1)"
           >
@@ -122,7 +123,7 @@ export interface MenuAction {
 
       <!-- Image quick ratios row (top, only for image) -->
       @if (block.type === 'image') {
-        <div class="flex items-center gap-2 px-3 py-2 border-b border-border">
+        <div class="flex items-center gap-1.5 px-2 py-1.5 border-b border-border">
           <div class="text-xs text-text-muted mr-1">Aspect</div>
           <button class="px-2 py-1 text-xs rounded border border-border hover:bg-surface2"
                   [class.bg-primary/10]="isActiveAspectRatio('free')"
@@ -145,7 +146,7 @@ export interface MenuAction {
       <!-- Main menu items -->
       <div class="py-1">
         <button 
-          class="w-full text-left px-4 py-2 hover:bg-surface2 transition flex items-center gap-3"
+          class="w-full text-left px-3 py-1.5 hover:bg-surface2 transition flex items-center gap-2.5 text-sm"
           (click)="onAction('comment')"
         >
           <span class="text-base">💬</span>
@@ -154,12 +155,12 @@ export interface MenuAction {
 
         <div class="relative">
           <button 
-            class="w-full text-left px-4 py-2 hover:bg-surface2 transition flex items-center gap-3 justify-between"
+            class="w-full text-left px-3 py-1.5 hover:bg-surface2 transition flex items-center gap-2.5 justify-between text-sm"
             [attr.data-submenu]="'add'"
             (mouseenter)="onOpenSubmenu($event, 'add')"
             (click)="toggleSubmenu($event, 'add')"
           >
-            <div class="flex items-center gap-3">
+            <div class="flex items-center gap-2.5">
               <span class="text-base">➕</span>
               <span>Add block</span>
             </div>
@@ -185,12 +186,12 @@ export interface MenuAction {
 
         @if (convertOptions.length) {
           <button 
-            class="w-full text-left px-4 py-2 hover:bg-surface2 transition flex items-center gap-3 justify-between"
+            class="w-full text-left px-3 py-1.5 hover:bg-surface2 transition flex items-center gap-2.5 justify-between text-sm"
             [attr.data-submenu]="'convert'"
             (mouseenter)="onOpenSubmenu($event, 'convert')"
             (click)="toggleSubmenu($event, 'convert')"
           >
-            <div class="flex items-center gap-3">
+            <div class="flex items-center gap-2.5">
               <span class="text-base">🔄</span>
               <span>Convert to</span>
             </div>
@@ -200,12 +201,12 @@ export interface MenuAction {
 
         <div class="relative">
           <button 
-            class="w-full text-left px-4 py-2 hover:bg-surface2 transition flex items-center gap-3 justify-between"
+            class="w-full text-left px-3 py-1.5 hover:bg-surface2 transition flex items-center gap-2.5 justify-between text-sm"
             [attr.data-submenu]="'background'"
             (mouseenter)="onOpenSubmenu($event, 'background')"
             (click)="toggleSubmenu($event, 'background')"
           >
-            <div class="flex items-center gap-3">
+            <div class="flex items-center gap-2.5">
               <span class="text-base">🎨</span>
               <span>Background color</span>
             </div>
@@ -215,19 +216,19 @@ export interface MenuAction {
           <!-- Background color submenu (anchored to row, no gap) -->
           <div 
             *ngIf="showSubmenu === 'background'"
-            class="bg-surface1 border border-border rounded-lg shadow-xl p-3 w-[240px] z-50"
+            class="bg-surface1 border border-border rounded-lg shadow-xl p-2 w-[200px] z-50"
             [attr.data-submenu-panel]="'background'"
             [ngStyle]="submenuStyle['background']"
             (mouseenter)="onColorMenuEnter('background'); keepSubmenuOpen('background')"
             (mouseleave)="onColorMenuLeave('background'); closeSubmenu()"
           >
-            <div class="grid grid-cols-5 gap-3">
+            <div class="grid grid-cols-5 gap-2">
               <button 
                 *ngFor="let color of backgroundColors"
-                class="w-7 h-7 rounded-full ring-2 transition"
+                class="w-5 h-5 rounded-full ring-1 transition hover:ring-2"
                 [style.backgroundColor]="color.value"
                 [attr.title]="color.name"
-                [ngClass]="{ 'ring-primary': isActiveBackgroundColor(color.value), 'ring-transparent hover:ring-primary': !isActiveBackgroundColor(color.value) }"
+                [ngClass]="{ 'ring-primary ring-2': isActiveBackgroundColor(color.value), 'ring-border hover:ring-primary': !isActiveBackgroundColor(color.value) }"
                 (mouseenter)="onColorHover('background', color.value)"
                 (click)="onBackgroundColor(color.value); onColorConfirm('background', color.value)"
               ></button>
@@ -238,11 +239,11 @@ export interface MenuAction {
         <!-- Border color (Hint blocks only) -->
         <div class="relative" *ngIf="block.type === 'hint'">
           <button 
-            class="w-full text-left px-4 py-2 hover:bg-surface2 transition flex items-center gap-3 justify-between"
+            class="w-full text-left px-3 py-1.5 hover:bg-surface2 transition flex items-center gap-2.5 justify-between text-sm"
             (mouseenter)="onOpenSubmenu($event, 'borderColor')"
             (click)="toggleSubmenu($event, 'borderColor')"
           >
-            <div class="flex items-center gap-3">
+            <div class="flex items-center gap-2.5">
               <span class="text-base">🎨</span>
               <span>Border color</span>
             </div>
@@ -252,19 +253,19 @@ export interface MenuAction {
           <!-- Border color submenu -->
           <div 
             *ngIf="showSubmenu === 'borderColor'"
-            class="bg-surface1 border border-border rounded-lg shadow-xl p-3 w-[240px] z-50"
+            class="bg-surface1 border border-border rounded-lg shadow-xl p-2 w-[200px] z-50"
             [attr.data-submenu-panel]="'borderColor'"
             [ngStyle]="submenuStyle['borderColor']"
             (mouseenter)="onColorMenuEnter('borderColor'); keepSubmenuOpen('borderColor')"
             (mouseleave)="onColorMenuLeave('borderColor'); closeSubmenu()"
           >
-            <div class="grid grid-cols-5 gap-3">
+            <div class="grid grid-cols-5 gap-2">
               <button 
                 *ngFor="let color of backgroundColors"
-                class="w-7 h-7 rounded-full ring-2 transition"
+                class="w-5 h-5 rounded-full ring-1 transition hover:ring-2"
                 [style.backgroundColor]="color.value"
                 [attr.title]="color.name"
-                [ngClass]="{ 'ring-primary': isActiveBorderColor(color.value), 'ring-transparent hover:ring-primary': !isActiveBorderColor(color.value) }"
+                [ngClass]="{ 'ring-primary ring-2': isActiveBorderColor(color.value), 'ring-border hover:ring-primary': !isActiveBorderColor(color.value) }"
                 (mouseenter)="onColorHover('borderColor', color.value)"
                 (click)="onBorderColor(color.value); onColorConfirm('borderColor', color.value)"
               ></button>
@@ -275,11 +276,11 @@ export interface MenuAction {
         <!-- Line color (Quote and Hint blocks) -->
         <div class="relative" *ngIf="block.type === 'quote' || block.type === 'hint'">
           <button 
-            class="w-full text-left px-4 py-2 hover:bg-surface2 transition flex items-center gap-3 justify-between"
+            class="w-full text-left px-3 py-1.5 hover:bg-surface2 transition flex items-center gap-2.5 justify-between text-sm"
             (mouseenter)="onOpenSubmenu($event, 'lineColor')"
             (click)="toggleSubmenu($event, 'lineColor')"
           >
-            <div class="flex items-center gap-3">
+            <div class="flex items-center gap-2.5">
               <span class="text-base">🖌️</span>
               <span>Line color</span>
             </div>
@@ -289,19 +290,19 @@ export interface MenuAction {
           <!-- Line color submenu -->
           <div 
             *ngIf="showSubmenu === 'lineColor'"
-            class="bg-surface1 border border-border rounded-lg shadow-xl p-3 w-[240px] z-50"
+            class="bg-surface1 border border-border rounded-lg shadow-xl p-2 w-[200px] z-50"
             [attr.data-submenu-panel]="'lineColor'"
             [ngStyle]="submenuStyle['lineColor']"
             (mouseenter)="onColorMenuEnter('lineColor'); keepSubmenuOpen('lineColor')"
             (mouseleave)="onColorMenuLeave('lineColor'); closeSubmenu()"
           >
-            <div class="grid grid-cols-5 gap-3">
+            <div class="grid grid-cols-5 gap-2">
               <button 
                 *ngFor="let color of backgroundColors"
-                class="w-7 h-7 rounded-full ring-2 transition"
+                class="w-5 h-5 rounded-full ring-1 transition hover:ring-2"
                 [style.backgroundColor]="color.value"
                 [attr.title]="color.name"
-                [ngClass]="{ 'ring-primary': isActiveLineColor(color.value), 'ring-transparent hover:ring-primary': !isActiveLineColor(color.value) }"
+                [ngClass]="{ 'ring-primary ring-2': isActiveLineColor(color.value), 'ring-border hover:ring-primary': !isActiveLineColor(color.value) }"
                 (mouseenter)="onColorHover('lineColor', color.value)"
                 (click)="onLineColor(color.value); onColorConfirm('lineColor', color.value)"
               ></button>
@@ -314,12 +315,12 @@ export interface MenuAction {
           <!-- Language submenu -->
           <div class="relative">
             <button 
-              class="w-full text-left px-4 py-2 hover:bg-surface2 transition flex items-center gap-3 justify-between"
+              class="w-full text-left px-3 py-1.5 hover:bg-surface2 transition flex items-center gap-2.5 justify-between text-sm"
               [attr.data-submenu]="'codeLanguage'"
               (mouseenter)="onOpenSubmenu($event, 'codeLanguage')"
               (click)="toggleSubmenu($event, 'codeLanguage')"
             >
-              <div class="flex items-center gap-3">
+              <div class="flex items-center gap-2.5">
                 <span class="text-base">🔤</span>
                 <span>Language</span>
               </div>
@@ -350,12 +351,12 @@ export interface MenuAction {
           <!-- Theme submenu -->
           <div class="relative">
             <button 
-              class="w-full text-left px-4 py-2 hover:bg-surface2 transition flex items-center gap-3 justify-between"
+              class="w-full text-left px-3 py-1.5 hover:bg-surface2 transition flex items-center gap-2.5 justify-between text-sm"
               [attr.data-submenu]="'codeTheme'"
               (mouseenter)="onOpenSubmenu($event, 'codeTheme')"
               (click)="toggleSubmenu($event, 'codeTheme')"
             >
-              <div class="flex items-center gap-3">
+              <div class="flex items-center gap-2.5">
                 <span class="text-base">🎨</span>
                 <span>Theme</span>
               </div>
@@ -385,7 +386,7 @@ export interface MenuAction {
 
           <!-- Copy code -->
           <button 
-            class="w-full text-left px-4 py-2 hover:bg-surface2 transition flex items-center gap-3"
+            class="w-full text-left px-3 py-1.5 hover:bg-surface2 transition flex items-center gap-2.5 text-sm"
             (click)="onAction('copyCode')"
           >
             <span class="text-base">📋</span>
@@ -394,7 +395,7 @@ export interface MenuAction {
 
           <!-- Toggle wrap -->
           <button 
-            class="w-full text-left px-4 py-2 hover:bg-surface2 transition flex items-center gap-3"
+            class="w-full text-left px-3 py-1.5 hover:bg-surface2 transition flex items-center gap-2.5 text-sm"
             (click)="onAction('toggleWrap')"
           >
             <span class="text-base">{{ getCodeWrapIcon() }}</span>
@@ -403,7 +404,7 @@ export interface MenuAction {
 
           <!-- Toggle line numbers -->
           <button 
-            class="w-full text-left px-4 py-2 hover:bg-surface2 transition flex items-center gap-3"
+            class="w-full text-left px-3 py-1.5 hover:bg-surface2 transition flex items-center gap-2.5 text-sm"
             (click)="onAction('toggleLineNumbers')"
           >
             <span class="text-base">{{ getCodeLineNumbersIcon() }}</span>
@@ -415,7 +416,7 @@ export interface MenuAction {
         @if (block.type === 'image') {
           <!-- Add caption -->
           <button 
-            class="w-full text-left px-4 py-2 hover:bg-surface2 transition flex items-center gap-3"
+            class="w-full text-left px-3 py-1.5 hover:bg-surface2 transition flex items-center gap-2.5 text-sm"
             (click)="onAction('addCaption')"
           >
             <span class="text-base">📝</span>
@@ -425,12 +426,12 @@ export interface MenuAction {
           <!-- Aspect ratio submenu -->
           <div class="relative">
             <button 
-              class="w-full text-left px-4 py-2 hover:bg-surface2 transition flex items-center gap-3 justify-between"
+              class="w-full text-left px-3 py-1.5 hover:bg-surface2 transition flex items-center gap-2.5 justify-between text-sm"
               [attr.data-submenu]="'imageAspectRatio'"
               (mouseenter)="onOpenSubmenu($event, 'imageAspectRatio')"
               (click)="toggleSubmenu($event, 'imageAspectRatio')"
             >
-              <div class="flex items-center gap-3">
+              <div class="flex items-center gap-2.5">
                 <span class="text-base">📐</span>
                 <span>Aspect ratio</span>
               </div>
@@ -456,12 +457,12 @@ export interface MenuAction {
           <!-- Alignment submenu -->
           <div class="relative">
             <button 
-              class="w-full text-left px-4 py-2 hover:bg-surface2 transition flex items-center gap-3 justify-between"
+              class="w-full text-left px-3 py-1.5 hover:bg-surface2 transition flex items-center gap-2.5 justify-between text-sm"
               [attr.data-submenu]="'imageAlignment'"
               (mouseenter)="onOpenSubmenu($event, 'imageAlignment')"
               (click)="toggleSubmenu($event, 'imageAlignment')"
             >
-              <div class="flex items-center gap-3">
+              <div class="flex items-center gap-2.5">
                 <span class="text-base">↔️</span>
                 <span>Alignment</span>
               </div>
@@ -485,7 +486,7 @@ export interface MenuAction {
 
           <!-- Replace image -->
           <button 
-            class="w-full text-left px-4 py-2 hover:bg-surface2 transition flex items-center gap-3"
+            class="w-full text-left px-3 py-1.5 hover:bg-surface2 transition flex items-center gap-2.5 text-sm"
             (click)="onAction('imageReplace')"
           >
             <span class="text-base">🖼️</span>
@@ -494,7 +495,7 @@ export interface MenuAction {
 
           <!-- Rotate image -->
           <button 
-            class="w-full text-left px-4 py-2 hover:bg-surface2 transition flex items-center gap-3"
+            class="w-full text-left px-3 py-1.5 hover:bg-surface2 transition flex items-center gap-2.5 text-sm"
             (click)="onAction('imageRotate')"
           >
             <span class="text-base">🔄</span>
@@ -503,7 +504,7 @@ export interface MenuAction {
 
           <!-- Set as preview -->
           <button 
-            class="w-full text-left px-4 py-2 hover:bg-surface2 transition flex items-center gap-3"
+            class="w-full text-left px-3 py-1.5 hover:bg-surface2 transition flex items-center gap-2.5 text-sm"
             (click)="onAction('imageSetPreview')"
           >
             <span class="text-base">⭐</span>
@@ -512,7 +513,7 @@ export interface MenuAction {
 
           <!-- OCR -->
           <button 
-            class="w-full text-left px-4 py-2 hover:bg-surface2 transition flex items-center gap-3"
+            class="w-full text-left px-3 py-1.5 hover:bg-surface2 transition flex items-center gap-2.5 text-sm"
             (click)="onAction('imageOCR')"
           >
             <span class="text-base">🧠</span>
@@ -521,7 +522,7 @@ export interface MenuAction {
 
           <!-- Download -->
           <button 
-            class="w-full text-left px-4 py-2 hover:bg-surface2 transition flex items-center gap-3"
+            class="w-full text-left px-3 py-1.5 hover:bg-surface2 transition flex items-center gap-2.5 text-sm"
             (click)="onAction('imageDownload')"
           >
             <span class="text-base">⬇️</span>
@@ -530,7 +531,7 @@ export interface MenuAction {
 
           <!-- View full size -->
           <button 
-            class="w-full text-left px-4 py-2 hover:bg-surface2 transition flex items-center gap-3"
+            class="w-full text-left px-3 py-1.5 hover:bg-surface2 transition flex items-center gap-2.5 text-sm"
             (click)="onAction('imageViewFull')"
           >
             <span class="text-base">🔎</span>
@@ -539,7 +540,7 @@ export interface MenuAction {
 
           <!-- Open in new tab -->
           <button 
-            class="w-full text-left px-4 py-2 hover:bg-surface2 transition flex items-center gap-3"
+            class="w-full text-left px-3 py-1.5 hover:bg-surface2 transition flex items-center gap-2.5 text-sm"
             (click)="onAction('imageOpenTab')"
           >
             <span class="text-base">🪟</span>
@@ -548,7 +549,7 @@ export interface MenuAction {
 
           <!-- Image info -->
           <button 
-            class="w-full text-left px-4 py-2 hover:bg-surface2 transition flex items-center gap-3"
+            class="w-full text-left px-3 py-1.5 hover:bg-surface2 transition flex items-center gap-2.5 text-sm"
             (click)="onAction('imageInfo')"
           >
             <span class="text-base">ℹ️</span>
@@ -560,7 +561,7 @@ export interface MenuAction {
         @if (block.type === 'table') {
           <!-- Add caption -->
           <button 
-            class="w-full text-left px-4 py-2 hover:bg-surface2 transition flex items-center gap-3"
+            class="w-full text-left px-3 py-1.5 hover:bg-surface2 transition flex items-center gap-2.5 text-sm"
             (click)="onAction('addCaption')"
           >
             <span class="text-base">📝</span>
@@ -570,12 +571,12 @@ export interface MenuAction {
           <!-- Table layout -->
           <div class="relative">
             <button 
-              class="w-full text-left px-4 py-2 hover:bg-surface2 transition flex items-center gap-3 justify-between"
+              class="w-full text-left px-3 py-1.5 hover:bg-surface2 transition flex items-center gap-2.5 justify-between text-sm"
               [attr.data-submenu]="'tableLayout'"
               (mouseenter)="onOpenSubmenu($event, 'tableLayout')"
               (click)="toggleSubmenu($event, 'tableLayout')"
             >
-              <div class="flex items-center gap-3">
+              <div class="flex items-center gap-2.5">
                 <span class="text-base">📐</span>
                 <span>Table layout</span>
               </div>
@@ -610,7 +611,7 @@ export interface MenuAction {
 
           <!-- Copy table -->
           <button 
-            class="w-full text-left px-4 py-2 hover:bg-surface2 transition flex items-center gap-3"
+            class="w-full text-left px-3 py-1.5 hover:bg-surface2 transition flex items-center gap-2.5 text-sm"
             (click)="onAction('copyTable')"
           >
             <span class="text-base">📋</span>
@@ -619,7 +620,7 @@ export interface MenuAction {
 
           <!-- Filter -->
           <button 
-            class="w-full text-left px-4 py-2 hover:bg-surface2 transition flex items-center gap-3"
+            class="w-full text-left px-3 py-1.5 hover:bg-surface2 transition flex items-center gap-2.5 text-sm"
             (click)="onAction('filterTable')"
           >
             <span class="text-base">🔍</span>
@@ -628,7 +629,7 @@ export interface MenuAction {
 
           <!-- Import from CSV -->
           <button 
-            class="w-full text-left px-4 py-2 hover:bg-surface2 transition flex items-center gap-3"
+            class="w-full text-left px-3 py-1.5 hover:bg-surface2 transition flex items-center gap-2.5 text-sm"
             (click)="onAction('importCSV')"
           >
             <span class="text-base">📥</span>
@@ -636,7 +637,7 @@ export interface MenuAction {
           </button>
 
           <!-- Insert column (submenu inline avec 3 icônes) -->
-          <div class="px-4 py-2 border-t border-border dark:border-gray-700">
+          <div class="px-3 py-1.5 border-t border-border dark:border-gray-700">
             <div class="text-xs text-text-muted dark:text-neutral-500 mb-2">Insert column</div>
             <div class="flex gap-2">
               <button 
@@ -675,7 +676,7 @@ export interface MenuAction {
 
           <!-- Help -->
           <button 
-            class="w-full text-left px-4 py-2 hover:bg-surface2 dark:hover:bg-gray-700 transition flex items-center gap-3"
+            class="w-full text-left px-3 py-1.5 hover:bg-surface2 transition flex items-center gap-2.5 text-sm"
             (click)="onAction('tableHelp')"
           >
             <span class="text-base">❓</span>
@@ -686,7 +687,7 @@ export interface MenuAction {
         <div class="h-px bg-border dark:bg-gray-700 my-1"></div>
 
         <button 
-          class="w-full text-left px-4 py-2 hover:bg-surface2 transition flex items-center gap-3"
+          class="w-full text-left px-3 py-1.5 hover:bg-surface2 transition flex items-center gap-2.5 text-sm"
           (click)="onAction('duplicate')"
         >
           <span class="text-base">📋</span>
@@ -694,7 +695,7 @@ export interface MenuAction {
         </button>
 
         <button 
-          class="w-full text-left px-4 py-2 hover:bg-surface2 transition flex items-center gap-3"
+          class="w-full text-left px-3 py-1.5 hover:bg-surface2 transition flex items-center gap-2.5 text-sm"
           (click)="onAction('copy')"
         >
           <span class="text-base">📄</span>
@@ -702,7 +703,7 @@ export interface MenuAction {
         </button>
 
         <button 
-          class="w-full text-left px-4 py-2 hover:bg-surface2 transition flex items-center gap-3"
+          class="w-full text-left px-3 py-1.5 hover:bg-surface2 transition flex items-center gap-2.5 text-sm"
           (click)="onAction('lock')"
         >
           <span class="text-base">🔒</span>
@@ -710,7 +711,7 @@ export interface MenuAction {
         </button>
 
         <button 
-          class="w-full text-left px-4 py-2 hover:bg-surface2 transition flex items-center gap-3"
+          class="w-full text-left px-3 py-1.5 hover:bg-surface2 transition flex items-center gap-2.5 text-sm"
           (click)="onAction('copyLink')"
         >
           <span class="text-base">🔗</span>
@@ -720,7 +721,7 @@ export interface MenuAction {
         <div class="h-px bg-border dark:bg-gray-700 my-1"></div>
 
         <button 
-          class="w-full text-left px-4 py-2 hover:bg-red-500/10 text-red-500 transition flex items-center gap-3"
+          class="w-full text-left px-3 py-1.5 hover:bg-red-500/10 text-red-500 transition flex items-center gap-2.5 text-sm"
           (click)="onAction('delete')"
         >
           <span class="text-base">🗑️</span>
@@ -731,82 +732,88 @@ export interface MenuAction {
       <!-- Convert to submenu -->
       <div 
         *ngIf="showSubmenu === 'convert' && convertOptions.length"
-        class="bg-surface1 border border-border rounded-lg shadow-xl min-w-[280px] py-2"
+        class="submenu-pro bg-surface1 border border-border rounded-lg shadow-xl min-w-[260px] max-h-[420px] overflow-y-auto p-1.5"
         [attr.data-submenu-panel]="'convert'"
         [ngStyle]="submenuStyle['convert']"
         (mouseenter)="keepSubmenuOpen('convert')"
         (mouseleave)="closeSubmenu()"
         (mousedown)="$event.stopPropagation()"
       >
+        @for (group of groupedConvertOptions | keyvalue; track group.key) {
+          <div class="mb-1.5 last:mb-0">
+            <div class="text-[10px] font-semibold tracking-wide text-text-muted uppercase px-3 pt-2 pb-1">{{ group.key }}</div>
+            @for (item of group.value; track item.label) {
               <button 
-          *ngFor="let item of convertOptions"
+                class="w-full text-left px-3 py-1 rounded-md hover:bg-surface-hover transition flex items-center justify-between text-[13px] leading-tight"
-          class="w-full text-left px-4 py-2 hover:bg-surface2 dark:hover:bg-gray-700 transition flex items-center justify-between"
                 (mousedown)="onConvert(item.type, item.preset)"
                 (click)="$event.preventDefault()"
               >
-          <div class="flex items-center gap-3">
+                <div class="flex items-center gap-2.5">
-            <span class="text-base w-5 flex items-center justify-center">
+                  <span class="text-sm w-5 h-5 flex items-center justify-center text-text-muted">{{ item.icon }}</span>
-              @if (item.type === 'list-item' && item.preset?.kind === 'check') {
+                  <span class="text-text-main truncate">{{ item.label }}</span>
-                <svg class="w-5 h-5" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
-                  <rect x="3" y="3" width="5" height="5" rx="1"/>
-                  <path d="M10 6h10"/>
-                  <rect x="3" y="10" width="5" height="5" rx="1"/>
-                  <path d="M10 13h10"/>
-                  <rect x="3" y="17" width="5" height="5" rx="1"/>
-                  <path d="M10 20h10"/>
-                </svg>
-              } @else if (item.type === 'list-item' && item.preset?.kind === 'bullet') {
-                <svg class="w-5 h-5" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
-                  <circle cx="5.5" cy="5.5" r="1.5"/>
-                  <path d="M10 6h10"/>
-                  <circle cx="5.5" cy="12.5" r="1.5"/>
-                  <path d="M10 13h10"/>
-                  <circle cx="5.5" cy="19.5" r="1.5"/>
-                  <path d="M10 20h10"/>
-                </svg>
-              } @else if (item.type === 'list-item' && item.preset?.kind === 'numbered') {
-                <svg class="w-5 h-5" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
-                  <text x="4" y="7" font-size="5" text-anchor="middle" dominant-baseline="middle" fill="currentColor" stroke="none">1</text>
-                  <path d="M10 7h10"/>
-                  <text x="4" y="14" font-size="5" text-anchor="middle" dominant-baseline="middle" fill="currentColor" stroke="none">2</text>
-                  <path d="M10 14h10"/>
-                  <text x="4" y="21" font-size="5" text-anchor="middle" dominant-baseline="middle" fill="currentColor" stroke="none">3</text>
-                  <path d="M10 21h10"/>
-                </svg>
-              } @else {
-                {{ item.icon }}
-              }
-            </span>
-            <span>{{ item.label }}</span>
                 </div>
-          <span class="text-xs text-text-muted">{{ item.shortcut }}</span>
+                <span class="shortcut-key">{{ item.shortcut }}</span>
               </button>
+            }
+          </div>
+        }
       </div>
 
       <!-- Background submenu moved into the Background row above -->
     </div>
   `,
   styles: [`
-    :host { display: contents; }
+    :host {
+      position: fixed;
+      inset: 0;
+      pointer-events: none;
+      z-index: 2147483646;
+    }
     .ctx {
       pointer-events: auto;
-      border-radius: 0.75rem;
+      border-radius: 0.5rem;
-      box-shadow: 0 10px 30px rgba(0,0,0,.25);
+      box-shadow: 0 16px 40px rgba(0,0,0,.32);
-      background: var(--card, #ffffff);
+      background: var(--card, #0b1120);
-      border: 1px solid var(--border, #e5e7eb);
+      border: 1px solid var(--border, rgba(148,163,184,0.5));
-      color: var(--text-main, var(--fg, #111827));
+      color: var(--text-main, var(--fg, #e5e7eb));
-      z-index: 2147483646;
       max-height: calc(100vh - 16px);
       overflow-y: auto;
-      overflow-x: hidden; /* submenus are fixed-positioned; avoid horizontal scrollbar */
+      overflow-x: hidden;
+      font-size: 0.875rem;
       animation: fadeIn .12s ease-out;
     }
-    /* Stronger highlight on hover/focus for all buttons inside the menu (override utility classes) */
     .ctx button:hover,
     .ctx button:focus,
     .ctx [data-submenu-panel] button:hover {
       background: var(--menu-hover, rgba(0,0,0,0.16)) !important;
     }
+    .submenu-pro {
+      scrollbar-width: thin;
+    }
+    .submenu-pro::-webkit-scrollbar {
+      width: 6px;
+    }
+    .submenu-pro::-webkit-scrollbar-track {
+      background: transparent;
+    }
+    .submenu-pro::-webkit-scrollbar-thumb {
+      background: rgba(148,163,184,0.6);
+      border-radius: 999px;
+    }
+    .submenu-pro .shortcut-key {
+      background-color: var(--surface2, #0f172a);
+      color: var(--text-muted, #9ca3af);
+      padding: 2px 8px;
+      border-radius: 999px;
+      font-size: 0.7rem;
+      border: 1px solid var(--border, rgba(148,163,184,0.7));
+      white-space: nowrap;
+    }
+    .dark .submenu-pro .shortcut-key {
+      background-color: var(--surface2, #020617);
+      color: var(--text-muted, #e5e7eb);
+      border-color: var(--border, rgba(148,163,184,0.9));
+    }
     .ctx button:focus { outline: none; }
     @keyframes fadeIn { from { opacity:0; transform: scale(.97);} to { opacity:1; transform: scale(1);} }
   `]
@@ -821,14 +828,24 @@ export class BlockContextMenuComponent implements OnChanges {
   private documentService = inject(DocumentService);
   private elementRef = inject(ElementRef);
   readonly codeThemeService = inject(CodeThemeService);
+  private blockMenuStylingService = inject(BlockMenuStylingService);
   private clipboardData: Block | null = null;
 
   @ViewChild('menu') menuRef?: ElementRef<HTMLElement>;
 
   // viewport-safe coordinates
-  left = 0;
+  left = -9999;
-  top = 0;
+  top = -9999;
-  private repositionRaf: number | null = null;
+  opacity = 0;
+
+  constructor() {
+    try {
+      const el = this.elementRef.nativeElement as HTMLElement;
+      if (el && el.parentElement !== document.body) {
+        document.body.appendChild(el);
+      }
+    } catch {}
+  }
 
   @HostListener('document:click', ['$event'])
   onDocumentClick(event: MouseEvent): void {
@@ -864,8 +881,8 @@ export class BlockContextMenuComponent implements OnChanges {
     }
   }
 
-  @HostListener('window:resize') onResize() { if (this.visible) this.scheduleReposition(); }
+  @HostListener('window:resize') onResize() { if (this.visible) this.reposition(); }
-  @HostListener('window:scroll') onScroll() { if (this.visible) this.scheduleReposition(); }
+  @HostListener('window:scroll') onScroll() { if (this.visible) this.reposition(); }
 
   // If hovering a non-submenu option within the main menu, close any open submenu
   @HostListener('mouseover', ['$event'])
@@ -886,32 +903,25 @@ export class BlockContextMenuComponent implements OnChanges {
   }
 
   ngOnChanges(changes: SimpleChanges): void {
-    if (changes['visible']) {
+    if (changes['visible'] && this.visible) {
-      if (this.visible) {
+      this.open();
-        this.left = this.position.x;
+    } else if (changes['visible'] && !this.visible) {
-        this.top = this.position.y;
+      this.opacity = 0;
-        this.scheduleReposition();
+      this.left = -9999;
-        queueMicrotask(() => this.focusFirstItem());
+      this.top = -9999;
     }
-    }
+
-    if ((changes['position']) && this.visible) {
+    if (changes['position'] && this.visible) {
-      this.left = this.position.x;
+      this.open();
-      this.top = this.position.y;
-      this.scheduleReposition();
     }
   }
 
-  private scheduleReposition() {
-    if (this.repositionRaf != null) cancelAnimationFrame(this.repositionRaf);
-    const el = this.menuRef?.nativeElement; if (el) el.style.visibility = 'hidden';
-    this.repositionRaf = requestAnimationFrame(() => { this.repositionRaf = null; this.reposition(); });
-  }
 
   private reposition() {
     const el = this.menuRef?.nativeElement; if (!el) return;
     const rect = el.getBoundingClientRect();
     const vw = window.innerWidth; const vh = window.innerHeight;
-    let left = this.left; let top = this.top;
+    let left = this.position.x; let top = this.position.y;
     // horizontal clamp
     if (left + rect.width > vw - 8) left = Math.max(8, vw - rect.width - 8);
     if (left < 8) left = 8;
@@ -920,8 +930,11 @@ export class BlockContextMenuComponent implements OnChanges {
       top = Math.max(8, top - rect.height);
     }
     if (top < 8) top = 8;
-    // if still too tall, rely on max-height + scroll
+
-    this.left = left; this.top = top; if (el) el.style.visibility = 'visible';
+    this.left = left;
+    this.top = top;
+    this.opacity = 1;
+
     // also keep any open submenu in position relative to its anchor
     if (this.showSubmenu && this._submenuAnchor) {
       this.positionSubmenu(this.showSubmenu, this._submenuAnchor);
@@ -929,6 +942,18 @@ export class BlockContextMenuComponent implements OnChanges {
   }
 
   // Keyboard navigation
+  private open() {
+    this.left = this.position.x;
+    this.top = this.position.y;
+    this.opacity = 0; // Keep it hidden until repositioned
+
+    // Wait for the DOM to update with the new position
+    setTimeout(() => {
+      this.reposition();
+      queueMicrotask(() => this.focusFirstItem());
+    }, 0);
+  }
+
   @HostListener('window:keydown', ['$event'])
   onKey(e: KeyboardEvent) {
     if (!this.visible) return;
@@ -1000,29 +1025,46 @@ export class BlockContextMenuComponent implements OnChanges {
     if (!anchor) return;
     const panel = document.querySelector(`[data-submenu-panel="${id}"]`) as HTMLElement | null;
     if (!panel) return;
+
     const r = anchor.getBoundingClientRect();
-    const vw = window.innerWidth; const vh = window.innerHeight;
+    const vw = window.innerWidth; 
-    // ensure fixed positioning so it never affects the main menu scroll area
+    const vh = window.innerHeight;
+    const gap = 4; // Gap between main menu and submenu
+
+    // Temporarily position off-screen to measure dimensions
+    panel.style.visibility = 'hidden';
     panel.style.position = 'fixed';
-    panel.style.maxHeight = Math.max(100, vh - 16) + 'px';
+    panel.style.left = '-9999px';
-    // First try opening to the right (small gap to allow mouse travel)
+    panel.style.top = '-9999px';
-    let left = r.right + 4;
+    panel.style.maxHeight = `${vh - 16}px`;
-    // place top aligned with anchor top
+
+    const pw = panel.offsetWidth;
+    const ph = panel.offsetHeight;
+
+    let left = r.right + gap;
     let top = r.top;
-    // Measure panel size (after position temp offscreen)
+
-    panel.style.left = '-9999px'; panel.style.top = '-9999px';
+    // Adjust horizontal position
-    const pw = panel.offsetWidth || 260; const ph = panel.offsetHeight || 200;
-    // Auto-invert horizontally if overflowing
     if (left + pw > vw - 8) {
-      left = Math.max(8, r.left - pw - 2);
+      left = r.left - pw - gap;
     }
-    // Clamp vertical within viewport
+    if (left < 8) {
-    if (top + ph > vh - 8) top = Math.max(8, vh - ph - 8);
+      left = 8;
-    if (top < 8) top = 8;
+    }
-    // Apply
+
-    this.submenuStyle[id] = { position: 'fixed', left: left + 'px', top: top + 'px' };
+    // Adjust vertical position
-    panel.style.left = left + 'px';
+    if (top + ph > vh - 8) {
-    panel.style.top = top + 'px';
+      top = vh - ph - 8;
+    }
+    if (top < 8) {
+      top = 8;
+    }
+
+    // Apply final position and make visible
+    this.submenuStyle[id] = { position: 'fixed', left: `${left}px`, top: `${top}px` };
+    panel.style.left = `${left}px`;
+    panel.style.top = `${top}px`;
+    panel.style.visibility = 'visible';
   }
 
   private maybeCloseSubmenuOnFocusChange(focused: HTMLElement) {
@@ -1115,25 +1157,7 @@ export class BlockContextMenuComponent implements OnChanges {
   }
 
   get convertOptions() {
-    const base = [
-      { type: 'list-item' as BlockType, preset: { kind: 'check', checked: false, text: '' }, icon: '☑️', label: 'Checkbox list', shortcut: 'ctrl+shift+c' },
-      { type: 'list-item' as BlockType, preset: { kind: 'numbered', number: 1, text: '' }, icon: '1.', label: 'Numbered list', shortcut: 'ctrl+shift+7' },
-      { type: 'list-item' as BlockType, preset: { kind: 'bullet', text: '' }, icon: '•', label: 'Bullet list', shortcut: 'ctrl+shift+8' },
-      { type: 'toggle' as BlockType, preset: null, icon: '▶️', label: 'Toggle Block', shortcut: 'ctrl+alt+6' },
-      { type: 'paragraph' as BlockType, preset: null, icon: '¶', label: 'Paragraph', shortcut: 'ctrl+alt+7' },
-      { type: 'steps' as BlockType, preset: null, icon: '📝', label: 'Steps', shortcut: '' },
-      { type: 'heading' as BlockType, preset: { level: 1 }, icon: 'H₁', label: 'Large Heading', shortcut: 'ctrl+alt+1' },
-      { type: 'heading' as BlockType, preset: { level: 2 }, icon: 'H₂', label: 'Medium Heading', shortcut: 'ctrl+alt+2' },
-      { type: 'heading' as BlockType, preset: { level: 3 }, icon: 'H₃', label: 'Small Heading', shortcut: 'ctrl+alt+3' },
-      { type: 'code' as BlockType, preset: null, icon: '</>', label: 'Code', shortcut: 'ctrl+alt+c' },
-      { type: 'quote' as BlockType, preset: null, icon: '❝', label: 'Quote', shortcut: 'ctrl+alt+y' },
-      { type: 'hint' as BlockType, preset: null, icon: 'ℹ️', label: 'Hint', shortcut: 'ctrl+alt+u' },
-      { type: 'button' as BlockType, preset: null, icon: '🔘', label: 'Button', shortcut: 'ctrl+alt+5' }
-    ];
-
-    // Restrict for file/image per requirements
     if (this.block?.type === 'file') {
-      // only when underlying file is an image kind
       const props: any = this.block.props || {};
       const meta = props.meta || {};
       let kind = meta.kind as string | undefined;
@@ -1143,14 +1167,18 @@ export class BlockContextMenuComponent implements OnChanges {
         if (['png','jpg','jpeg','gif','webp','bmp','svg'].includes(ext)) kind = 'image';
       }
       if (kind === 'image') {
-        return [{ type: 'image' as BlockType, preset: null, icon: '🖼️', label: 'Image', shortcut: '' }];
+        return [{ type: 'image' as BlockType, preset: null, icon: '🖼️', label: 'Image', shortcut: '', category: 'MEDIA' }];
       }
       return [];
     }
     if (this.block?.type === 'image') {
-      return [{ type: 'file' as BlockType, preset: null, icon: '📎', label: 'File', shortcut: '' }];
+      return [{ type: 'file' as BlockType, preset: null, icon: '📎', label: 'File', shortcut: '', category: 'MEDIA' }];
     }
-    return base;
+    return this.blockMenuStylingService.getConvertOptions();
+  }
+
+  get groupedConvertOptions() {
+    return this.blockMenuStylingService.getGroupedConvertOptions();
   }
 
   backgroundColors = [

src/app/editor/components/block/block-host.component.ts

@@ -88,12 +88,12 @@ import { CollapsibleBlockComponent } from './blocks/collapsible-block.component'
       @if (block.type !== 'columns') {
         <button
           type="button"
-          class="menu-handle opacity-0 group-hover:opacity-100 transition-opacity absolute -left-8 top-1/2 -translate-y-1/2 p-1.5 rounded hover:bg-surface2 dark:hover:bg-gray-700"
+          class="menu-handle opacity-0 group-hover:opacity-100 transition-opacity absolute -left-5 top-1/2 -translate-y-1/2 w-5 h-5 flex items-center justify-center rounded-full bg-surface2/80 hover:bg-surface2 dark:bg-gray-700/80 dark:hover:bg-gray-700 shadow-sm"
           title="Click to open menu"
           (click)="onMenuClick($event)"
           (mousedown)="onDragStart($event)"
         >
-          <svg class="w-5 h-5 text-text-muted" fill="currentColor" viewBox="0 0 16 16">
+          <svg class="w-2 h-2 text-gray-300" fill="currentColor" viewBox="0 0 16 16">
             <circle cx="3" cy="8" r="1.5"/>
             <circle cx="8" cy="8" r="1.5"/>
             <circle cx="13" cy="8" r="1.5"/>
@@ -190,7 +190,7 @@ import { CollapsibleBlockComponent } from './blocks/collapsible-block.component'
           }
         }
       </div>
-      <ng-container *ngIf="block.type !== 'table'">
+      <ng-container *ngIf="block.type !== 'table' && block.type !== 'columns'">
         <!-- Filled white speech bubble with count (count in black) -->
         <button *ngIf="totalComments() > 0" class="absolute top-1/2 -translate-y-1/2 right-2 w-8 h-8 flex items-center justify-center z-20"
                 title="View comments" (click)="openComments()">

src/app/editor/components/block/block-inline-toolbar.component.ts

@@ -10,7 +10,7 @@ export interface InlineToolbarAction {
   standalone: true,
   imports: [CommonModule],
   template: `
-    <div class="group/block relative flex items-center justify-between gap-2 bg-[var(--editor-bg)] rounded-2xl px-4 py-2 shadow-sm z-[60]">
+    <div class="group/block relative flex items-center justify-between gap-2 bg-[var(--block-bg,var(--editor-bg))] rounded-2xl px-4 py-1 shadow-sm z-[10]">
       <!-- Drag handle (visible on hover) -->
       @if (showDragHandle) {
         <div 
@@ -205,6 +205,7 @@ export interface InlineToolbarAction {
           <button *ngIf="!actions || actions.includes('more')"
             class="p-1.5 rounded transition-colors text-gray-400 hover:text-gray-100 cursor-pointer"
             title="More items"
+            data-inline-more="true"
             (click)="onAction('more')"
             type="button"
           >

src/app/editor/components/block/blocks/columns-block.component.ts

@@ -1,4 +1,4 @@
-import { Component, Input, Output, EventEmitter, inject, ViewChild, signal, effect } from '@angular/core';
+import { Component, Input, Output, EventEmitter, inject, ViewChild, signal, effect, ElementRef, HostListener, AfterViewInit } from '@angular/core';
 import { CommonModule } from '@angular/common';
 import { Block, ColumnsProps, ColumnItem } from '../../../core/models/block.model';
 import { DragDropService } from '../../../services/drag-drop.service';
@@ -30,6 +30,7 @@ import { ListBlockComponent } from './list-block.component';
 import { CommentsPanelComponent } from '../../comments/comments-panel.component';
 import { BlockContextMenuComponent } from '../block-context-menu.component';
 import { DragDropFilesDirective } from '../../../../blocks/file/directives/drag-drop-files.directive';
+import { PaletteItem } from '../../../core/constants/palette-items';
 
 @Component({
   selector: 'app-columns-block',
@@ -95,7 +96,7 @@ import { DragDropFilesDirective } from '../../../../blocks/file/directives/drag-
 
               <!-- Render block with background color support -->
               <div 
-                class="relative px-1.5 py-0.5 pr-8 rounded transition-colors"
+                class="relative px-1.5 py-1 pr-8 rounded transition-colors"
                 [style.background-color]="getBlockBgColor(block)"
                 [ngStyle]="getBlockStyles(block)"
               >
@@ -129,6 +130,7 @@ import { DragDropFilesDirective } from '../../../../blocks/file/directives/drag-
                       (metaChange)="onBlockMetaChange($event, block.id)"
                       (createBlock)="onBlockCreateBelow(block.id, colIndex, blockIndex)"
                       (deleteBlock)="onBlockDelete(block.id)"
+                      (convertRequested)="onConvertRequested($event, block.id)"
                     />
                   }
                   @case ('list-item') {
@@ -205,6 +207,15 @@ import { DragDropFilesDirective } from '../../../../blocks/file/directives/drag-
           }
         </div>
       }
+      @if (props.columns.length > 1) {
+        @for (i of resizerIndexes; track i) {
+          <div
+            class="col-resizer absolute top-0 bottom-0 w-2 cursor-col-resize"
+            [style.left.px]="resizerPositions()[i]"
+            (mousedown)="onResizerDown(i, $event)"
+          ></div>
+        }
+      }
     </div>
     
     <!-- Comments Panel -->
@@ -237,9 +248,17 @@ import { DragDropFilesDirective } from '../../../../blocks/file/directives/drag-
     [contenteditable]:focus {
       outline: none;
     }
+
+    .col-resizer {
+      /* visually subtle hit zone */
+      transform: translateX(-4px);
+    }
+    .col-resizer:hover {
+      background: rgba(56, 189, 248, 0.15);
+    }
   `]
 })
-export class ColumnsBlockComponent {
+export class ColumnsBlockComponent implements AfterViewInit {
   private readonly dragDrop = inject(DragDropService);
   private readonly commentService = inject(CommentService);
   private readonly documentService = inject(DocumentService);
@@ -248,6 +267,7 @@ export class ColumnsBlockComponent {
   @Input({ required: true }) block!: Block<ColumnsProps>;
   @Output() update = new EventEmitter<ColumnsProps>();
   @ViewChild('commentsPanel') commentsPanel?: CommentsPanelComponent;
+  @ViewChild('columnsContainer', { static: true }) columnsContainerRef!: ElementRef<HTMLElement>;
   
   // Menu state
   selectedBlock = signal<Block | null>(null);
@@ -258,6 +278,11 @@ export class ColumnsBlockComponent {
   private draggedBlock: { block: Block; columnIndex: number; blockIndex: number } | null = null;
   private dropIndicator = signal<{ columnIndex: number; blockIndex: number } | null>(null);
 
+  // Resize state
+  private readonly MIN_COL_WIDTH = 10; // percent
+  private resizeState: { active: boolean; index: number; startX: number; containerWidth: number; leftStart: number; rightStart: number } | null = null;
+  resizerPositions = signal<number[]>([]);
+
   get props(): ColumnsProps {
     return this.block.props;
   }
@@ -266,6 +291,29 @@ export class ColumnsBlockComponent {
     return this.commentService.getCommentCount(blockId);
   }
 
+  onConvertRequested(item: PaletteItem, blockId: string): void {
+    // Map palette selection to block type and optional preset
+    let newType = item.type as any;
+    let preset: any = undefined;
+    // Headings levels
+    if (item.id === 'heading-1') preset = { level: 1 };
+    else if (item.id === 'heading-2') preset = { level: 2 };
+    else if (item.id === 'heading-3') preset = { level: 3 };
+
+    // Lists -> list-item presets
+    if (item.id === 'checkbox-list') { newType = 'list-item'; preset = { kind: 'check', checked: false }; }
+    else if (item.id === 'numbered-list') { newType = 'list-item'; preset = { kind: 'numbered', number: 1 }; }
+    else if (item.id === 'bullet-list') { newType = 'list-item'; preset = { kind: 'bullet' }; }
+
+    // Collapsible variants
+    if (item.id === 'collapsible-large') { newType = 'collapsible'; preset = { level: 1 }; }
+    else if (item.id === 'collapsible-medium') { newType = 'collapsible'; preset = { level: 2 }; }
+    else if (item.id === 'collapsible-small') { newType = 'collapsible'; preset = { level: 3 }; }
+
+    // Apply conversion within columns
+    this.convertBlockInColumns(blockId, newType, preset);
+  }
+  
   openComments(blockId: string): void {
     this.commentsPanel?.open(blockId);
   }
@@ -600,6 +648,9 @@ export class ColumnsBlockComponent {
   }
   
   getBlockBgColor(block: Block): string | undefined {
+    if (block.type === 'paragraph') {
+      return undefined;
+    }
     const bgColor = (block.meta as any)?.bgColor;
     return bgColor && bgColor !== 'transparent' ? bgColor : undefined;
   }
@@ -625,6 +676,15 @@ export class ColumnsBlockComponent {
     return Math.random().toString(36).substring(2, 11);
   }
 
+  ngAfterViewInit(): void {
+    setTimeout(() => this.computeResizerPositions(), 0);
+  }
+
+  @HostListener('window:resize')
+  onWindowResize(): void {
+    this.computeResizerPositions();
+  }
+  
   onDragStart(block: Block, columnIndex: number, blockIndex: number, event: MouseEvent): void {
     event.stopPropagation();
     
@@ -796,4 +856,77 @@ export class ColumnsBlockComponent {
     // Emit the updated columns
     this.update.emit({ columns: updatedColumns });
   }
+
+  // Resizer helpers
+  get resizerIndexes(): number[] {
+    const n = (this.props.columns?.length || 0) - 1;
+    if (n <= 0) return [];
+    return Array.from({ length: n }, (_, i) => i);
+  }
+
+  private computeResizerPositions(): void {
+    try {
+      const container = this.columnsContainerRef?.nativeElement;
+      if (!container) return;
+      const cols = Array.from(container.querySelectorAll<HTMLElement>('[data-column-index]'));
+      const crect = container.getBoundingClientRect();
+      const positions: number[] = [];
+      for (let i = 0; i < cols.length - 1; i++) {
+        const r = cols[i].getBoundingClientRect();
+        positions.push(r.right - crect.left);
+      }
+      this.resizerPositions.set(positions);
+    } catch {}
+  }
+
+  onResizerDown(i: number, event: MouseEvent): void {
+    event.preventDefault();
+    event.stopPropagation();
+    const container = this.columnsContainerRef?.nativeElement;
+    if (!container) return;
+    const crect = container.getBoundingClientRect();
+    const cols = this.props.columns || [];
+    const left = cols[i];
+    const right = cols[i + 1];
+    const leftStart = Number(left?.width ?? (100 / cols.length));
+    const rightStart = Number(right?.width ?? (100 / cols.length));
+    this.resizeState = {
+      active: true,
+      index: i,
+      startX: event.clientX,
+      containerWidth: Math.max(1, crect.width),
+      leftStart,
+      rightStart
+    };
+
+    const onMove = (e: MouseEvent) => {
+      if (!this.resizeState) return;
+      const dx = e.clientX - this.resizeState.startX;
+      const dxPct = (dx / this.resizeState.containerWidth) * 100;
+      const sum = this.resizeState.leftStart + this.resizeState.rightStart;
+      let newLeft = this.resizeState.leftStart + dxPct;
+      // Clamp with min constraints
+      const min = this.MIN_COL_WIDTH;
+      newLeft = Math.max(min, Math.min(sum - min, newLeft));
+      const newRight = sum - newLeft;
+      const updated = (this.props.columns || []).map((col, idx) => {
+        if (idx === i) return { ...col, width: newLeft } as ColumnItem;
+        if (idx === i + 1) return { ...col, width: newRight } as ColumnItem;
+        return col;
+      });
+      this.update.emit({ columns: updated });
+      // Recompute positions on next tick to reflect DOM changes
+      setTimeout(() => this.computeResizerPositions(), 0);
+    };
+
+    const onUp = () => {
+      document.removeEventListener('mousemove', onMove);
+      document.removeEventListener('mouseup', onUp);
+      this.resizeState = null;
+      this.computeResizerPositions();
+    };
+
+    document.addEventListener('mousemove', onMove);
+    document.addEventListener('mouseup', onUp, { once: true });
+  }
 }

src/app/editor/components/block/blocks/heading-block.component.ts

@@ -121,37 +121,65 @@ export class HeadingBlockComponent implements AfterViewInit {
       return;
     }
 
-    // Up/Down: navigate to previous/next block when at start/end
+    // Up/Down: navigate to previous/next block while preserving caret column
     if (event.key === 'ArrowUp' || event.key === 'ArrowDown') {
-      const el = (event.target as HTMLElement);
+      const el = event.target as HTMLElement;
       const text = el.textContent || '';
       const sel = window.getSelection();
       if (!sel) return;
 
       const atStart = sel.anchorOffset === 0;
       const atEnd = sel.anchorOffset === text.length;
+      const singleLine = !text.includes('\n');
 
-      if (event.key === 'ArrowUp' && atStart) {
+      (window as any).__obsiviewerCaretColumn = sel.anchorOffset;
+
+      if (event.key === 'ArrowUp') {
+        if (singleLine || atStart) {
           event.preventDefault();
           this.focusSibling(-1);
         }
-      if (event.key === 'ArrowDown' && atEnd) {
+      }
+
+      if (event.key === 'ArrowDown') {
+        if (singleLine || atEnd) {
           event.preventDefault();
           this.focusSibling(1);
         }
       }
     }
+  }
 
   private focusSibling(delta: number): void {
-    // Access DocumentService via window DI not available; rely on document structure
     setTimeout(() => {
-      const host = (this.editable?.nativeElement?.closest('[data-block-id]')) as HTMLElement | null;
+      const host = this.editable?.nativeElement?.closest('[data-block-id]') as HTMLElement | null;
       if (!host) return;
-      const blocks = Array.from(document.querySelectorAll('[data-block-id]')) as HTMLElement[];
+      const blocksEls = Array.from(document.querySelectorAll('[data-block-id]')) as HTMLElement[];
-      const idx = blocks.findIndex(b => b === host);
+      const idx = blocksEls.findIndex(b => b === host);
-      const next = blocks[idx + delta];
+      if (idx === -1) return;
-      const target = next?.querySelector('[contenteditable]') as HTMLElement | null;
+
-      target?.focus();
+      let i = idx + delta;
+      while (i >= 0 && i < blocksEls.length) {
+        const candidate = blocksEls[i];
+        const nextEditable = candidate.querySelector('input[type="text"], textarea, [contenteditable]') as HTMLElement | null;
+        if (nextEditable) {
+          nextEditable.focus();
+          const sel = window.getSelection();
+          if (!sel) return;
+          const range = document.createRange();
+          const text = nextEditable.textContent || '';
+          const desired = typeof (window as any).__obsiviewerCaretColumn === 'number'
+            ? (window as any).__obsiviewerCaretColumn
+            : text.length;
+          const offset = Math.max(0, Math.min(text.length, desired));
+          range.setStart(nextEditable.firstChild || nextEditable, offset);
+          range.collapse(true);
+          sel.removeAllRanges();
+          sel.addRange(range);
+          return;
+        }
+        i += delta;
+      }
     }, 0);
   }
 }

src/app/editor/components/block/blocks/list-block.component.ts

@@ -19,12 +19,19 @@ import { SelectionService } from '../../../services/selection.service';
             @if (kind() === 'bullet') {
               <div class="rounded-full bg-slate-200" style="width: 8px; height: 8px;"></div>
             } @else if (kind() === 'check') {
-              <input type="checkbox"
+              <button type="button"
-                class="cursor-pointer"
+                class="cursor-pointer flex items-center justify-center focus:outline-none"
-                style="width: 20px; height: 20px; border: 2px solid rgba(148, 163, 184, 0.8); border-radius: 2px; background: transparent;"
+                (click)="onToggleCheck(it.id, $event)"
-                [checked]="it.checked || false"
+                (keydown)="onCheckboxKeyDown(i, $event)"
-                (change)="onCheckChange($event, it.id)"
+              >
-                (click)="$event.stopPropagation()" />
+                <div class="flex items-center justify-center bg-transparent" style="width: 20px; height: 20px; border: 2px solid rgba(148, 163, 184, 0.8); border-radius: 2px;">
+                  @if (it.checked) {
+                    <svg viewBox="0 0 24 24" class="w-4 h-4 text-slate-900">
+                      <path fill="currentColor" d="M9.5 17.25L4.75 12.5L6.16 11.09L9.5 14.43L17.84 6.09L19.25 7.5L9.5 17.25Z" />
+                    </svg>
+                  }
+                </div>
+              </button>
             } @else {
               <span class="text-slate-200" style="font-size: 16px; font-weight: 500;">{{ i + 1 }}.</span>
             }
@@ -33,8 +40,10 @@ import { SelectionService } from '../../../services/selection.service';
           <!-- Input pill - inherits block color or uses transparent background -->
           <input #inp type="text"
             class="flex-1 rounded-xl px-5 py-2.5 text-xl leading-7 focus:outline-none cursor-text border-none"
-            [class.text-slate-900]="hasBlockColor()"
+            [class.text-slate-900]="hasBlockColor() && !(kind() === 'check' && it.checked)"
-            [class.text-slate-100]="!hasBlockColor()"
+            [class.text-slate-100]="!hasBlockColor() && !(kind() === 'check' && it.checked)"
+            [class.text-slate-500]="kind() === 'check' && it.checked"
+            [class.opacity-60]="kind() === 'check' && it.checked"
             [class.placeholder-slate-500]="hasBlockColor()"
             [class.placeholder-slate-200/60]="!hasBlockColor()"
             [style.background-color]="getInputBackground()"
@@ -153,9 +162,11 @@ export class ListBlockComponent implements OnInit, AfterViewInit {
     this.emit(arr);
   }
 
-  onCheckChange(ev: Event, itemId: string): void {
+  onToggleCheck(itemId: string, ev: MouseEvent): void {
-    const checked = (ev.target as HTMLInputElement).checked;
+    ev.preventDefault();
-    const arr = this.items().map(item => item.id === itemId ? { ...item, checked } : item);
+    ev.stopPropagation();
+    const current = this.items();
+    const arr = current.map(item => item.id === itemId ? { ...item, checked: !item.checked } : item);
     this.items.set(arr);
     this.emit(arr);
   }
@@ -178,6 +189,28 @@ export class ListBlockComponent implements OnInit, AfterViewInit {
       return;
     }
 
+    // ArrowUp/ArrowDown: navigate between list items or to sibling blocks
+    if (ev.key === 'ArrowUp' || ev.key === 'ArrowDown') {
+      (window as any).__obsiviewerCaretColumn = input.selectionStart ?? 0;
+      ev.preventDefault();
+      const items = this.items();
+      const lastIndex = items.length - 1;
+      if (ev.key === 'ArrowUp') {
+        if (i > 0) {
+          this.focusItemWithColumn(i - 1);
+        } else {
+          this.focusSiblingBlock(-1, i);
+        }
+      } else {
+        if (i < lastIndex) {
+          this.focusItemWithColumn(i + 1);
+        } else {
+          this.focusSiblingBlock(1, i);
+        }
+      }
+      return;
+    }
+
     // Slash in prompt opens palette
     if (ev.key === '/' && this.promptIndex() !== null) {
       ev.preventDefault();
@@ -194,6 +227,30 @@ export class ListBlockComponent implements OnInit, AfterViewInit {
     }
   }
 
+  onCheckboxKeyDown(i: number, ev: KeyboardEvent): void {
+    // Up/Down on the checkbox itself should behave like on the text input
+    if (ev.key === 'ArrowUp' || ev.key === 'ArrowDown') {
+      (window as any).__obsiviewerCaretColumn = 0;
+      ev.preventDefault();
+      const items = this.items();
+      const lastIndex = items.length - 1;
+      if (ev.key === 'ArrowUp') {
+        if (i > 0) {
+          this.focusItemWithColumn(i - 1);
+        } else {
+          this.focusSiblingBlock(-1, i);
+        }
+      } else {
+        if (i < lastIndex) {
+          this.focusItemWithColumn(i + 1);
+        } else {
+          this.focusSiblingBlock(1, i);
+        }
+      }
+      return;
+    }
+  }
+
   insertAfter(i: number) {
     const arr = [...this.items()];
     arr.splice(i + 1, 0, { id: generateItemId(), text: '', checked: this.kind() === 'check' ? false : undefined });
@@ -219,12 +276,64 @@ export class ListBlockComponent implements OnInit, AfterViewInit {
   focus(i: number) {
     const el = this.inputs?.get(i)?.nativeElement;
     el?.focus();
-    const len = el?.value.length ?? 0;
+  }
-    el?.setSelectionRange(len, len);
+
+  private focusItemWithColumn(i: number): void {
+    const el = this.inputs?.get(i)?.nativeElement;
+    if (!el) return;
+    el.focus();
+    const len = el.value.length;
+    const stored = (window as any).__obsiviewerCaretColumn;
+    const pos = typeof stored === 'number' ? Math.max(0, Math.min(len, stored)) : len;
+    el.setSelectionRange(pos, pos);
+  }
+
+  private focusSiblingBlock(delta: number, fromIndex: number): void {
+    const source = this.inputs?.get(fromIndex)?.nativeElement || this.inputs?.first?.nativeElement;
+    if (!source) return;
+    const host = source.closest('[data-block-id]') as HTMLElement | null;
+    if (!host) return;
+    const blocksEls = Array.from(document.querySelectorAll('[data-block-id]')) as HTMLElement[];
+    const idx = blocksEls.findIndex(b => b === host);
+    if (idx === -1) return;
+
+    let j = idx + delta;
+    while (j >= 0 && j < blocksEls.length) {
+      const candidate = blocksEls[j];
+      // Prefer text inputs/contenteditable over checkboxes when entering another block
+      const nextEditable = candidate.querySelector('input[type="text"], textarea, [contenteditable]') as HTMLElement | null;
+      if (nextEditable) {
+        const id = candidate.getAttribute('data-block-id');
+        if (id) {
+          try { this.selection.setActive(id); } catch {}
+        }
+        nextEditable.focus();
+        const stored = (window as any).__obsiviewerCaretColumn;
+        if (nextEditable instanceof HTMLInputElement || nextEditable instanceof HTMLTextAreaElement) {
+          const len = nextEditable.value.length;
+          const pos = typeof stored === 'number' ? Math.max(0, Math.min(len, stored)) : len;
+          nextEditable.setSelectionRange(pos, pos);
+        } else {
+          const sel = window.getSelection();
+          if (!sel) return;
+          const range = document.createRange();
+          const text = nextEditable.textContent || '';
+          const desired = typeof stored === 'number' ? stored : text.length;
+          const offset = Math.max(0, Math.min(text.length, desired));
+          range.setStart(nextEditable.firstChild || nextEditable, offset);
+          range.collapse(true);
+          sel.removeAllRanges();
+          sel.addRange(range);
+        }
+        return;
+      }
+      j += delta;
+    }
   }
 
   onItemClick(i: number): void {
-    this.focus(i);
+    const el = this.inputs?.get(i)?.nativeElement;
+    el?.focus();
   }
 
   @HostListener('document:keydown', ['$event'])

src/app/editor/components/block/blocks/list-item-block.component.ts

@@ -10,18 +10,30 @@ import { DocumentService } from '../../../services/document.service';
   standalone: true,
   imports: [CommonModule, FormsModule],
   template: `
-    <div class="flex items-center gap-3 cursor-text w-full" (click)="focusInput()" [style.padding-left.px]="getIndentPadding()">
+    <div class="flex items-center gap-3 cursor-text w-full" (click)="onContainerClick($event)" [style.padding-left.px]="getIndentPadding()">
       <!-- Marker (bullet, checkbox, or number) -->
       <div class="flex-shrink-0 flex items-center justify-center" style="width: 24px; min-width: 24px;">
         @if (props.kind === 'bullet') {
           <span class="text-slate-200" style="font-size: 18px; line-height: 1;">{{ getBulletSymbol() }}</span>
         } @else if (props.kind === 'check') {
-          <input type="checkbox"
+          <button type="button"
-            class="cursor-pointer"
+            class="cursor-pointer flex items-center justify-center focus:outline-none"
-            style="width: 20px; height: 20px; border: 2px solid rgba(148, 163, 184, 0.8); border-radius: 2px; background: transparent;"
+            (click)="onCheckboxToggle($event)"
-            [checked]="props.checked || false"
+            (keydown)="onCheckboxKeyDown($event)"
-            (change)="onCheckChange($event)"
+            [attr.aria-pressed]="props.checked ? 'true' : 'false'"
-            (click)="$event.stopPropagation()" />
+          >
+            <div
+              class="flex items-center justify-center"
+              [class.bg-slate-100]="props.checked"
+              [class.text-slate-900]="props.checked"
+              style="width: 20px; height: 20px; border: 2px solid rgba(148, 163, 184, 0.8); border-radius: 2px;">
+              @if (props.checked) {
+                <svg viewBox="0 0 24 24" class="w-4 h-4">
+                  <path fill="currentColor" d="M9.5 17.25L4.75 12.5L6.16 11.09L9.5 14.43L17.84 6.09L19.25 7.5L9.5 17.25Z" />
+                </svg>
+              }
+            </div>
+          </button>
         } @else {
           <span class="text-slate-200" style="font-size: 16px; font-weight: 500;">{{ props.number || 1 }}.</span>
         }
@@ -30,8 +42,10 @@ import { DocumentService } from '../../../services/document.service';
       <!-- Input text - inherits block color or uses transparent background -->
       <input #inp type="text"
         class="flex-1 rounded-xl px-5 py-2.5 text-xl leading-7 cursor-text border-none shadow-none"
-        [class.text-slate-900]="hasBlockColor()"
+        [class.text-slate-900]="hasBlockColor() && !(props.kind === 'check' && props.checked)"
-        [class.text-slate-100]="!hasBlockColor()"
+        [class.text-slate-100]="!hasBlockColor() && !(props.kind === 'check' && props.checked)"
+        [class.text-slate-500]="props.kind === 'check' && props.checked"
+        [class.opacity-60]="props.kind === 'check' && props.checked"
         [class.placeholder-slate-500]="hasBlockColor()"
         [class.placeholder-slate-200/60]="!hasBlockColor()"
         [class.text-left]="getAlignment() === 'left'"
@@ -123,11 +137,6 @@ export class ListItemBlockComponent implements OnInit, AfterViewInit {
     this.update.emit({ ...this.props, text: v });
   }
 
-  onCheckChange(ev: Event): void {
-    const checked = (ev.target as HTMLInputElement).checked;
-    this.update.emit({ ...this.props, checked });
-  }
-
   onKeyDown(ev: KeyboardEvent): void {
     const input = ev.target as HTMLInputElement;
     
@@ -185,6 +194,33 @@ export class ListItemBlockComponent implements OnInit, AfterViewInit {
       this.documentService.deleteBlock(this.block.id);
       return;
     }
+    
+    // ArrowUp/ArrowDown: navigate between blocks while preserving caret column
+    if (ev.key === 'ArrowUp' || ev.key === 'ArrowDown') {
+      (window as any).__obsiviewerCaretColumn = input.selectionStart ?? 0;
+      ev.preventDefault();
+      this.focusSibling(ev.key === 'ArrowUp' ? -1 : 1);
+      return;
+    }
+  }
+
+  onCheckboxToggle(ev: Event): void {
+    ev.preventDefault();
+    ev.stopPropagation();
+    this.update.emit({ ...this.props, checked: !this.props.checked });
+  }
+
+  onCheckboxKeyDown(ev: KeyboardEvent): void {
+    if (ev.key === 'ArrowUp' || ev.key === 'ArrowDown') {
+      (window as any).__obsiviewerCaretColumn = 0;
+      ev.preventDefault();
+      this.focusSibling(ev.key === 'ArrowUp' ? -1 : 1);
+      return;
+    }
+
+    if (ev.key === ' ' || ev.key === 'Enter') {
+      this.onCheckboxToggle(ev);
+    }
   }
 
   focusInput(): void {
@@ -193,4 +229,51 @@ export class ListItemBlockComponent implements OnInit, AfterViewInit {
     const len = el?.value.length ?? 0;
     el?.setSelectionRange(len, len);
   }
+
+  onContainerClick(event: MouseEvent): void {
+    // If the user clicks directly into the input, let the browser place the caret
+    const target = event.target as HTMLElement;
+    if (target.tagName.toLowerCase() === 'input') {
+      return;
+    }
+    // Clicking elsewhere in the row focuses the input at end
+    this.focusInput();
+  }
+
+  private focusSibling(delta: number): void {
+    const host = this.input?.nativeElement.closest('[data-block-id]') as HTMLElement | null;
+    if (!host) return;
+    const blocksEls = Array.from(document.querySelectorAll('[data-block-id]')) as HTMLElement[];
+    const idx = blocksEls.findIndex(b => b === host);
+    if (idx === -1) return;
+
+    let i = idx + delta;
+    while (i >= 0 && i < blocksEls.length) {
+      const candidate = blocksEls[i];
+      const nextEditable = candidate.querySelector('input[type="text"], textarea, [contenteditable]') as HTMLElement | null;
+      if (nextEditable) {
+        nextEditable.focus();
+        const stored = (window as any).__obsiviewerCaretColumn;
+        if (nextEditable instanceof HTMLInputElement || nextEditable instanceof HTMLTextAreaElement) {
+          const len = nextEditable.value.length;
+          const desired = typeof stored === 'number' ? stored : len;
+          const pos = Math.max(0, Math.min(len, desired));
+          nextEditable.setSelectionRange(pos, pos);
+        } else {
+          const sel = window.getSelection();
+          if (!sel) return;
+          const range = document.createRange();
+          const text = nextEditable.textContent || '';
+          const desired = typeof stored === 'number' ? stored : text.length;
+          const offset = Math.max(0, Math.min(text.length, desired));
+          range.setStart(nextEditable.firstChild || nextEditable, offset);
+          range.collapse(true);
+          sel.removeAllRanges();
+          sel.addRange(range);
+        }
+        return;
+      }
+      i += delta;
+    }
+  }
 }

src/app/editor/components/block/blocks/paragraph-block.component.ts

@@ -16,6 +16,7 @@ import { PaletteCategory, PaletteItem, getPaletteItemsByCategory, PALETTE_ITEMS
   template: `
     <div 
       class="relative"
+      [style.--block-bg]="getBlockBgColor()"
       (click)="onContainerClick($event)"
     >
       <app-block-inline-toolbar
@@ -30,14 +31,14 @@ import { PaletteCategory, PaletteItem, getPaletteItemsByCategory, PALETTE_ITEMS
           <div
             #editable
             contenteditable="true"
-            class="m-0 inline-block bg-transparent text-sm text-neutral-100 dark:text-neutral-100 focus:outline-none min-h-[1.25rem]"
+            class="m-0 inline-block bg-transparent text-sm text-neutral-100 dark:text-neutral-100 focus:outline-none min-h-[1rem]"
             (input)="onInput($event)"
             (keydown)="onKeyDown($event)"
             (focus)="isFocused.set(true)"
             (blur)="onBlur()"
             [attr.data-placeholder]="inColumn ? columnPlaceholder : placeholder"
           ></div>
-          @if (inColumn) {
+          @if (inColumn && isEmpty()) {
             <button
               type="button"
               class="inline-flex items-center justify-center w-6 h-6 rounded-full border border-gray-500 text-gray-200 text-base leading-none hover:bg-gray-600 hover:border-gray-400 transition-colors select-none"
@@ -127,7 +128,7 @@ import { PaletteCategory, PaletteItem, getPaletteItemsByCategory, PALETTE_ITEMS
     }
 
     [contenteditable] {
-      line-height: 1.25;
+      line-height: 1.15;
     }
 
     [contenteditable]:focus {
@@ -144,6 +145,8 @@ export class ParagraphBlockComponent implements AfterViewInit {
   @Output() metaChange = new EventEmitter<any>();
   @Output() createBlock = new EventEmitter<void>();
   @Output() deleteBlock = new EventEmitter<void>();
+  // In columns mode, request parent to convert this block based on palette selection
+  @Output() convertRequested = new EventEmitter<PaletteItem>();
 
   private documentService = inject(DocumentService);
   private selectionService = inject(SelectionService);
@@ -161,6 +164,12 @@ export class ParagraphBlockComponent implements AfterViewInit {
   menuLeft = signal(0);
   categories: PaletteCategory[] = ['BASIC','ADVANCED','MEDIA','INTEGRATIONS','VIEW','TEMPLATES','HELPFUL LINKS'];
 
+  getBlockBgColor(): string | undefined {
+    const meta: any = this.block?.meta || {};
+    const bgColor = meta.bgColor;
+    return bgColor && bgColor !== 'transparent' ? bgColor : undefined;
+  }
+
   onInlineAction(type: any): void {
     if (type === 'more' || type === 'menu') {
       this.openMenu();
@@ -189,6 +198,14 @@ export class ParagraphBlockComponent implements AfterViewInit {
 
   selectItem(item: PaletteItem): void {
     try { this.selectionService.setActive(this.block.id); } catch {}
+    if (this.inColumn) {
+      // Delegate conversion to ColumnsBlockComponent
+      this.isEmpty.set(false);
+      this.convertRequested.emit(item);
+      this.moreOpen.set(false);
+      setTimeout(() => this.editable?.nativeElement?.focus(), 0);
+      return;
+    }
     this.paletteService.applySelection(item);
     this.moreOpen.set(false);
     setTimeout(() => this.editable?.nativeElement?.focus(), 0);
@@ -216,7 +233,7 @@ export class ParagraphBlockComponent implements AfterViewInit {
     // Do not trigger container click / focus moves
     event.stopPropagation();
     event.preventDefault();
-    this.openMenu();
+    this.openMenu(event);
   }
 
   onKeyDown(event: KeyboardEvent): void {
@@ -267,54 +284,76 @@ export class ParagraphBlockComponent implements AfterViewInit {
       this.createBlock.emit();
       return;
     }
-    
-    // Handle SHIFT+ENTER: Allow line break in contenteditable
-    if (event.key === 'Enter' && event.shiftKey) {
-      // Default behavior - line break within block
-      return;
   }
 
-    // Handle BACKSPACE on empty block: open dropdown instead of delete
+  private openMenu(event?: MouseEvent): void {
-    if (event.key === 'Backspace') {
+    this.moreOpen.set(true);
-      const target = event.target as HTMLElement;
+    try { this.selectionService.setActive(this.block.id); } catch {}
-      const selection = window.getSelection();
+    // Compute viewport-safe position near the trigger icon (if provided),
-      if (selection && selection.anchorOffset === 0 && (!target.textContent || target.textContent.length === 0)) {
+    // otherwise fall back to the editable paragraph like the old behavior.
-        event.preventDefault();
+    setTimeout(() => {
-        this.openMenu();
+      const vw = window.innerWidth;
-        return;
+      const vh = window.innerHeight;
+      const panel = this.menuPanel?.nativeElement;
+
+      // Determine anchor rectangle: trigger element first, then inline toolbar, then editable block.
+      let anchorRect: DOMRect | null = null;
+      const target = (event?.currentTarget || event?.target) as HTMLElement | null;
+      if (target && target.getBoundingClientRect) {
+        anchorRect = target.getBoundingClientRect();
+      } else {
+        const editableEl = this.editable?.nativeElement;
+        // Try to anchor on the inline toolbar container so the menu appears near the toolbar buttons.
+        const toolbarEl = editableEl?.closest('app-block-inline-toolbar') as HTMLElement | null;
+        if (toolbarEl) {
+          anchorRect = toolbarEl.getBoundingClientRect();
+        } else if (editableEl) {
+          anchorRect = editableEl.getBoundingClientRect();
         }
       }
 
-    // ESC closes dropdown
+      // Measure panel size (after initial render) for accurate clamping.
-    if (event.key === 'Escape' && this.moreOpen()) {
+      const panelRect = panel?.getBoundingClientRect();
-      event.preventDefault();
+      const width = panelRect?.width ?? 420;
-      this.moreOpen.set(false);
+      const height = panelRect?.height ?? 0;
-      return;
+
+      // Default position: below and horizontally aligned with the anchor.
+      let top = (anchorRect?.bottom ?? 0) + 8;
+      let left: number;
+
+      if (event) {
+        // When opened from a specific button (e.g. "+" in columns), align from its left edge.
+        left = anchorRect?.left ?? 0;
+      } else {
+        // When opened from the inline toolbar / keyboard, align the menu to the right side
+        // of the toolbar so it appears beside the toolbar buttons (like the context menu).
+        const right = anchorRect ? anchorRect.right : vw;
+        left = right - width;
       }
 
-    // ArrowUp/ArrowDown navigation between blocks
+      // Horizontal clamp (keep inside viewport with 8px margin).
-    if (event.key === 'ArrowUp' || event.key === 'ArrowDown') {
+      if (left + width > vw - 8) {
-      const el = (event.target as HTMLElement);
+        left = Math.max(8, vw - width - 8);
-      const text = el.textContent || '';
+      }
-      const sel = window.getSelection();
+      if (left < 8) {
-      if (!sel) return;
+        left = 8;
+      }
 
-      const atStart = sel.anchorOffset === 0;
+      // Vertical clamp: open upwards if there is not enough space below.
-      const atEnd = sel.anchorOffset === text.length;
+      if (top + height > vh - 8 && anchorRect) {
-
+        top = anchorRect.top - height - 8;
-      if (event.key === 'ArrowUp' && atStart) {
-        event.preventDefault();
-        this.focusSibling(-1);
-      }
-      if (event.key === 'ArrowDown' && atEnd) {
-        event.preventDefault();
-        this.focusSibling(1);
       }
+      if (top < 8) {
+        top = 8;
       }
+      this.menuTop.set(Math.round(top));
+      this.menuLeft.set(Math.round(left));
+      try { panel?.focus(); } catch {}
+    }, 0);
   }
 
   onBlur(): void {
-    this.isFocused.set(false);
+    // ... (rest of the code remains the same)
     // Recompute emptiness in case content was cleared
     const el = this.editable?.nativeElement;
     if (el) this.isEmpty.set(!(el.textContent && el.textContent.length > 0));
@@ -369,48 +408,64 @@ export class ParagraphBlockComponent implements AfterViewInit {
   }
 
   onContainerClick(event: MouseEvent): void {
-    // Ignore clicks on buttons/icons to avoid stealing clicks
+    // If clicking inside the editable content, let browser place the caret naturally
     const target = event.target as HTMLElement;
+    if (target.closest('[contenteditable]')) return;
     if (target.closest('button')) return;
     const el = this.editable?.nativeElement;
     if (!el) return;
-    // Focus and place caret at start so cursor blinks before placeholder
+    // Focus and place caret at END when clicking the container area
     el.focus();
     const sel = window.getSelection();
     if (!sel) return;
     const range = document.createRange();
     range.selectNodeContents(el);
-    range.collapse(true); // start
+    range.collapse(false); // end
     sel.removeAllRanges();
     sel.addRange(range);
     this.isFocused.set(true);
   }
 
   private focusSibling(delta: number): void {
-    const blocks = this.documentService.blocks();
+    const blocksEls = Array.from(document.querySelectorAll('[data-block-id]')) as HTMLElement[];
-    const idx = blocks.findIndex(b => b.id === this.block.id);
+    const host = this.editable?.nativeElement.closest('[data-block-id]') as HTMLElement | null;
-    const next = blocks[idx + delta];
+    if (!host) return;
-    if (!next) return;
+    const idx = blocksEls.findIndex(b => b === host);
-    this.selectionService.setActive(next.id);
+    if (idx === -1) return;
-    setTimeout(() => {
-      const nextEl = document.querySelector(`[data-block-id="${next.id}"] [contenteditable]`) as HTMLElement | null;
-      nextEl?.focus();
-    }, 0);
-  }
 
-  private openMenu(): void {
+    let i = idx + delta;
-    this.moreOpen.set(true);
+    while (i >= 0 && i < blocksEls.length) {
-    try { this.selectionService.setActive(this.block.id); } catch {}
+      const candidate = blocksEls[i];
-    // Compute viewport position near the editable content
+      const nextEditable = candidate.querySelector('input[type="text"], textarea, [contenteditable]') as HTMLElement | null;
+      if (nextEditable) {
+        const id = candidate.getAttribute('data-block-id');
+        if (id) {
+          try { this.selectionService.setActive(id); } catch {}
+        }
         setTimeout(() => {
-      const el = this.editable?.nativeElement;
+          nextEditable.focus();
-      const rect = el?.getBoundingClientRect();
+          const stored = (window as any).__obsiviewerCaretColumn;
-      const top = (rect?.bottom ?? 0) + 8;
-      const left = Math.max(8, Math.min((rect?.left ?? 0), window.innerWidth - 440));
-      this.menuTop.set(Math.round(top));
-      this.menuLeft.set(Math.round(left));
-      try { this.menuPanel?.nativeElement.focus(); } catch {}
-    }, 0);
-  }
 
+          if (nextEditable instanceof HTMLInputElement || nextEditable instanceof HTMLTextAreaElement) {
+            const len = nextEditable.value.length;
+            const pos = typeof stored === 'number' ? Math.max(0, Math.min(len, stored)) : len;
+            nextEditable.setSelectionRange(pos, pos);
+          } else {
+            const sel = window.getSelection();
+            if (!sel) return;
+            const range = document.createRange();
+            const text = nextEditable.textContent || '';
+            const desired = typeof stored === 'number' ? stored : text.length;
+            const offset = Math.max(0, Math.min(text.length, desired));
+            range.setStart(nextEditable.firstChild || nextEditable, offset);
+            range.collapse(true);
+            sel.removeAllRanges();
+            sel.addRange(range);
+          }
+        }, 0);
+        return;
+      }
+      i += delta;
+    }
+  }
 }

src/app/editor/components/editor-shell/editor-shell.component.ts

@@ -209,12 +209,19 @@ export class EditorShellComponent implements AfterViewInit {
   showInitialMenu = signal(false);
   private insertAfterBlockId = signal<string | null>(null);
 
-  ngOnInit(): void {
+  async ngOnInit(): Promise<void> {
-    // Try to load from localStorage
+    // Try to load from the vault first (tests/nimbus-editor-snapshot.md)
-    const loaded = this.documentService.loadFromLocalStorage();
+    let loaded = await this.documentService.loadFromVault();
+
+    if (!loaded) {
+      // Legacy fallback: localStorage backup for the Nimbus test editor.
+      loaded = this.documentService.loadFromLocalStorage();
+    }
+
     if (!loaded) {
       this.documentService.createNew('Welcome to Nimbus Editor');
     }
+
     // Always start at top of page for the editor view
     try { window.scrollTo({ top: 0, behavior: 'auto' }); } catch {}
   }

src/app/editor/components/palette/block-menu.component.ts

@@ -1,4 +1,4 @@
-import { Component, inject, Output, EventEmitter, signal, computed, ViewChild, ElementRef, effect } from '@angular/core';
+import { Component, inject, Output, EventEmitter, signal, computed, ViewChild, ElementRef, effect, HostListener } from '@angular/core';
 import { CommonModule } from '@angular/common';
 import { FormsModule } from '@angular/forms';
 import { PaletteService } from '../../services/palette.service';
@@ -10,10 +10,12 @@ import { PaletteItem, PaletteCategory, getPaletteItemsByCategory } from '../../c
   imports: [CommonModule, FormsModule],
   template: `
     @if (paletteService.isOpen()) {
-      <div class="fixed inset-0 z-[9999] flex items-start justify-center pt-32" (click)="close()">
+      <div class="fixed inset-0 z-[9999]" (click)="close()">
         <div
           #menuPanel
-          class="bg-surface1 rounded-2xl shadow-surface-md border border-app w-[520px] max-h-[600px] overflow-hidden flex flex-col"
+          class="bg-surface1 rounded-2xl shadow-surface-md border border-app w-[520px] max-h-[600px] overflow-hidden flex flex-col fixed"
+          [style.left.px]="left"
+          [style.top.px]="top"
           (click)="$event.stopPropagation()"
         >
           <!-- Header collapsible -->
@@ -169,6 +171,9 @@ export class BlockMenuComponent {
   showSuggestions = signal(true);
   selectedItem = signal<PaletteItem | null>(null);
 
+  left = 0;
+  top = 0;
+
   categories: PaletteCategory[] = [
     'BASIC',
     'ADVANCED',
@@ -194,6 +199,70 @@ export class BlockMenuComponent {
     }
   });
 
+  private _positionEffect = effect(() => {
+    const isOpen = this.paletteService.isOpen();
+    if (!isOpen) return;
+    setTimeout(() => {
+      try { this.reposition(); } catch {}
+    }, 0);
+  });
+
+  @HostListener('window:resize')
+  onWindowResize(): void {
+    if (this.paletteService.isOpen()) {
+      this.reposition();
+    }
+  }
+
+  @HostListener('window:scroll')
+  onWindowScroll(): void {
+    if (this.paletteService.isOpen()) {
+      this.reposition();
+    }
+  }
+
+  private reposition(): void {
+    const panel = this.menuPanel?.nativeElement;
+    if (!panel) return;
+
+    const vw = window.innerWidth;
+    const vh = window.innerHeight;
+
+    const rect = panel.getBoundingClientRect();
+    const explicit = this.paletteService.position();
+    const triggerId = this.paletteService.triggerBlockId();
+
+    let left = explicit?.left ?? 0;
+    let top = explicit?.top ?? 0;
+
+    if (!explicit) {
+      let anchored = false;
+      if (triggerId) {
+        const triggerEl = document.querySelector(`[data-block-id="${triggerId}"]`) as HTMLElement | null;
+        if (triggerEl) {
+          const r = triggerEl.getBoundingClientRect();
+          left = r.left;
+          top = r.bottom + 8;
+          anchored = true;
+        }
+      }
+      if (!anchored) {
+        left = (vw - rect.width) / 2;
+        top = (vh - rect.height) / 2;
+      }
+    }
+
+    if (left + rect.width > vw - 8) left = Math.max(8, vw - rect.width - 8);
+    if (left < 8) left = 8;
+    if (top + rect.height > vh - 8) {
+      top = Math.max(8, top - rect.height);
+    }
+    if (top < 8) top = 8;
+
+    this.left = left;
+    this.top = top;
+  }
+
   toggleSuggestions(): void {
     this.showSuggestions.update(v => !v);
     // If suggestions become visible while open, focus the input

src/app/editor/services/block-menu-styling.service.ts

@@ -0,0 +1,50 @@
+import { Injectable } from '@angular/core';
+import { BlockType } from '../core/models/block.model';
+
+export interface MenuItem {
+  type: BlockType;
+  preset: any;
+  icon: string;
+  label: string;
+  shortcut: string;
+  category: string;
+}
+
+@Injectable({
+  providedIn: 'root'
+})
+export class BlockMenuStylingService {
+
+  private readonly MENU_STRUCTURE: MenuItem[] = [
+    // BASIC
+    { type: 'paragraph' as BlockType, preset: null, icon: '¶', label: 'Paragraph', shortcut: 'ctrl+alt+0', category: 'BASIC' },
+    { type: 'heading' as BlockType, preset: { level: 1 }, icon: 'H₁', label: 'Heading 1', shortcut: 'ctrl+alt+1', category: 'BASIC' },
+    { type: 'heading' as BlockType, preset: { level: 2 }, icon: 'H₂', label: 'Heading 2', shortcut: 'ctrl+alt+2', category: 'BASIC' },
+    { type: 'heading' as BlockType, preset: { level: 3 }, icon: 'H₃', label: 'Heading 3', shortcut: 'ctrl+alt+3', category: 'BASIC' },
+    { type: 'list-item' as BlockType, preset: { kind: 'bullet', text: '' }, icon: '•', label: 'Bullet list', shortcut: 'ctrl+shift+8', category: 'BASIC' },
+    { type: 'list-item' as BlockType, preset: { kind: 'numbered', number: 1, text: '' }, icon: '1.', label: 'Numbered list', shortcut: 'ctrl+shift+7', category: 'BASIC' },
+    { type: 'list-item' as BlockType, preset: { kind: 'check', checked: false, text: '' }, icon: '☑️', label: 'Checkbox list', shortcut: 'ctrl+shift+9', category: 'BASIC' },
+    { type: 'toggle' as BlockType, preset: null, icon: '▶️', label: 'Toggle Block', shortcut: 'ctrl+alt+t', category: 'BASIC' },
+
+    // ADVANCED
+    { type: 'code' as BlockType, preset: null, icon: '</>', label: 'Code', shortcut: 'ctrl+alt+c', category: 'ADVANCED' },
+    { type: 'quote' as BlockType, preset: null, icon: '❝', label: 'Quote', shortcut: 'ctrl+"', category: 'ADVANCED' },
+    { type: 'hint' as BlockType, preset: null, icon: 'ℹ️', label: 'Hint', shortcut: 'ctrl+alt+u', category: 'ADVANCED' },
+    { type: 'button' as BlockType, preset: null, icon: '🔘', label: 'Button', shortcut: 'ctrl+alt+b', category: 'ADVANCED' },
+    { type: 'steps' as BlockType, preset: null, icon: '📝', label: 'Steps', shortcut: '', category: 'ADVANCED' },
+  ];
+
+  getConvertOptions() {
+    return this.MENU_STRUCTURE;
+  }
+
+  getGroupedConvertOptions() {
+    return this.MENU_STRUCTURE.reduce((acc, item) => {
+      if (!acc[item.category]) {
+        acc[item.category] = [];
+      }
+      acc[item.category].push(item);
+      return acc;
+    }, {} as Record<string, MenuItem[]>);
+  }
+}

src/app/editor/services/document.service.ts

@@ -1,7 +1,8 @@
-import { Injectable, signal, computed, effect } from '@angular/core';
+import { Injectable, signal, computed, effect, inject } from '@angular/core';
 import { moveItemImmutable } from '../core/utils/reorder';
 import { Block, BlockType, DocumentModel, HeadingProps, OutlineHeading } from '../core/models/block.model';
 import { generateId } from '../core/utils/id-generator';
+import { VaultService } from '../../../services/vault.service';
 
 /**
  * Document state management service
@@ -21,6 +22,16 @@ export class DocumentService {
   private _saveTimeout: any;
   private readonly SAVE_DEBOUNCE = 750;
 
+  // Nimbus Editor persistence configuration (Section Tests)
+  // We persist the Nimbus DocumentModel snapshot as a Markdown file under tests/
+  // using a JSON code block instead of a raw .json file because the generic
+  // /api/files endpoint only accepts text/markdown (or Excalidraw JSON) for writes.
+  // This keeps the format consistent with the rest of the vault and leverages
+  // the existing VaultService.saveMarkdown() helper.
+  private readonly NIMBUS_TEST_FILE_PATH = 'tests/nimbus-editor-snapshot.md';
+
+  private readonly vaultService = inject(VaultService);
+
   // Public signals
   readonly doc = this._doc.asReadonly();
   readonly saveState = this._saveState.asReadonly();
@@ -567,6 +578,36 @@ export class DocumentService {
     }
   }
 
+  /**
+   * Load Nimbus Editor document from the vault (tests/nimbus-editor-snapshot.md).
+   * Returns true when a valid DocumentModel was found and loaded.
+   */
+  async loadFromVault(): Promise<boolean> {
+    try {
+      const url = `/api/files?path=${encodeURIComponent(this.NIMBUS_TEST_FILE_PATH)}`;
+      const res = await fetch(url);
+      if (!res.ok) {
+        if (res.status !== 404) {
+          console.error('[DocumentService] Failed to load Nimbus document from vault:', res.status, res.statusText);
+        }
+        return false;
+      }
+
+      const content = await res.text();
+      const doc = this.parseDocumentFromMarkdown(content);
+      if (!doc) {
+        console.warn('[DocumentService] Nimbus vault file exists but could not be parsed, falling back.');
+        return false;
+      }
+
+      this.load(doc);
+      return true;
+    } catch (error) {
+      console.error('[DocumentService] Error while loading Nimbus document from vault:', error);
+      return false;
+    }
+  }
+
   /**
    * Schedule save (debounced)
    */
@@ -577,25 +618,116 @@ export class DocumentService {
 
     this._saveState.set('saving');
     this._saveTimeout = setTimeout(() => {
-      this.saveToLocalStorage(snapshot);
+      // Persist to the vault for the "Éditeur Nimbus — Section Tests" test page,
+      // while still keeping a localStorage backup for safety.
+      void this.saveToVaultWithBackup(snapshot);
     }, this.SAVE_DEBOUNCE);
   }
 
   /**
-   * Save to localStorage
+   * Persist the current snapshot to the vault, with a best-effort localStorage backup.
+   *
+   * On success, saveState is set to 'saved'. On any error, saveState is set to 'error'
+   * but we still try to keep a local backup to reduce the risk of total data loss.
    */
-  private saveToLocalStorage(doc: DocumentModel): void {
+  private async saveToVaultWithBackup(doc: DocumentModel): Promise<void> {
     try {
-      localStorage.setItem('nimbus-editor-doc', JSON.stringify(doc));
+      await this.saveToVault(doc);
+      this.saveToLocalStorage(doc);
       this._saveState.set('saved');
     } catch (error) {
-      console.error('Failed to save document:', error);
+      console.error('[DocumentService] Failed to save Nimbus document to vault:', error);
+      // Still keep a best-effort local backup so the user does not lose work completely.
+      this.saveToLocalStorage(doc);
       this._saveState.set('error');
     }
   }
 
   /**
-   * Load from localStorage
+   * Save the Nimbus DocumentModel snapshot to the vault as a Markdown file
+   * under tests/, containing a JSON code block with the serialized model.
+   */
+  private async saveToVault(doc: DocumentModel): Promise<void> {
+    const markdown = this.serializeDocumentToMarkdown(doc);
+    const vault: any = this.vaultService as any;
+    const ok = await vault.saveMarkdown(this.NIMBUS_TEST_FILE_PATH, markdown);
+    if (!ok) {
+      throw new Error('VaultService.saveMarkdown returned false for Nimbus editor snapshot');
+    }
+  }
+
+  /**
+   * Serialize the in-memory DocumentModel to a Markdown document that embeds
+   * the full JSON snapshot in a fenced code block.
+   */
+  private serializeDocumentToMarkdown(doc: DocumentModel): string {
+    const json = JSON.stringify(doc, null, 2);
+    const lines: string[] = [];
+
+    lines.push('---');
+    lines.push('title: "Éditeur Nimbus — Section Tests"');
+    lines.push('nimbusEditor: true');
+    lines.push('documentModelFormat: "block-model-v1"');
+    lines.push('---');
+    lines.push('');
+    lines.push('```json');
+    lines.push(json);
+    lines.push('```');
+    lines.push('');
+
+    return lines.join('\n');
+  }
+
+  /**
+   * Extract a DocumentModel snapshot from the Markdown representation used
+   * for the Nimbus Editor test page. If parsing fails, returns null.
+   */
+  private parseDocumentFromMarkdown(content: string): DocumentModel | null {
+    try {
+      const marker = '```json';
+      const start = content.indexOf(marker);
+      if (start === -1) {
+        return null;
+      }
+
+      const afterMarker = content.indexOf('\n', start);
+      if (afterMarker === -1) {
+        return null;
+      }
+
+      const endFence = content.indexOf('```', afterMarker + 1);
+      if (endFence === -1) {
+        return null;
+      }
+
+      const jsonText = content.slice(afterMarker + 1, endFence).trim();
+      if (!jsonText) {
+        return null;
+      }
+
+      const parsed = JSON.parse(jsonText);
+      return parsed as DocumentModel;
+    } catch (error) {
+      console.error('[DocumentService] Failed to parse Nimbus document from markdown:', error);
+      return null;
+    }
+  }
+
+  /**
+   * Save a best-effort backup of the current document to localStorage. This is
+   * used as a safety net in addition to the vault persistence.
+   */
+  private saveToLocalStorage(doc: DocumentModel): void {
+    try {
+      localStorage.setItem('nimbus-editor-doc', JSON.stringify(doc));
+    } catch (error) {
+      console.error('Failed to save Nimbus document backup to localStorage:', error);
+    }
+  }
+
+  /**
+   * Load from localStorage (legacy / offline fallback used when the vault
+   * snapshot does not exist or cannot be parsed).
    */
   loadFromLocalStorage(): boolean {
     try {
@@ -606,13 +738,13 @@ export class DocumentService {
         return true;
       }
     } catch (error) {
-      console.error('Failed to load document:', error);
+      console.error('Failed to load Nimbus document from localStorage:', error);
     }
     return false;
   }
 
   /**
-   * Clear localStorage
+   * Clear the legacy localStorage backup.
    */
   clearLocalStorage(): void {
     localStorage.removeItem('nimbus-editor-doc');

vault/tests/nimbus-editor-snapshot.md

@@ -0,0 +1,347 @@
+---
+title: "Éditeur Nimbus — Section Tests"
+nimbusEditor: true
+documentModelFormat: "block-model-v1"
+---
+
+```json
+{
+  "id": "block_1763149113471_461xyut80",
+  "title": "Page Tests",
+  "blocks": [
+    {
+      "id": "block_1763234865120_um14zlycy",
+      "type": "heading",
+      "props": {
+        "level": 1,
+        "text": "H1"
+      },
+      "meta": {
+        "createdAt": "2025-11-15T19:27:45.120Z",
+        "updatedAt": "2025-11-15T20:06:49.723Z",
+        "align": "center",
+        "bgColor": "#dc2626"
+      }
+    },
+    {
+      "id": "block_1763240860187_hdklpobdf",
+      "type": "line",
+      "props": {
+        "style": "solid"
+      },
+      "meta": {
+        "createdAt": "2025-11-15T21:07:40.187Z",
+        "updatedAt": "2025-11-15T21:36:29.164Z"
+      }
+    },
+    {
+      "id": "block_1763234657433_5malb56fe",
+      "type": "list-item",
+      "props": {
+        "kind": "check",
+        "text": "checkbox",
+        "checked": false,
+        "indent": 0,
+        "align": "left"
+      },
+      "meta": {
+        "createdAt": "2025-11-15T19:24:17.433Z",
+        "updatedAt": "2025-11-15T20:13:56.404Z",
+        "bgColor": "#dc2626"
+      }
+    },
+    {
+      "id": "block_1763237180130_m82opx9yx",
+      "type": "paragraph",
+      "props": {
+        "text": "paragraphe"
+      },
+      "meta": {
+        "createdAt": "2025-11-15T20:06:20.130Z",
+        "updatedAt": "2025-11-15T20:13:50.464Z",
+        "bgColor": "#dc2626"
+      }
+    },
+    {
+      "id": "block_1763234665227_e09ql6sb4",
+      "type": "list-item",
+      "props": {
+        "kind": "bullet",
+        "text": "bullet",
+        "indent": 0,
+        "align": "left"
+      },
+      "meta": {
+        "createdAt": "2025-11-15T19:24:25.227Z",
+        "updatedAt": "2025-11-15T20:07:27.797Z",
+        "bgColor": "#dc2626"
+      }
+    },
+    {
+      "id": "block_1763237840896_fuw5hvm9t",
+      "type": "columns",
+      "props": {
+        "columns": [
+          {
+            "id": "or66s9hqb",
+            "blocks": [
+              {
+                "id": "block_1763237836743_a06ez4lux",
+                "type": "paragraph",
+                "props": {
+                  "text": "paragraphe"
+                },
+                "meta": {
+                  "createdAt": "2025-11-15T20:17:16.743Z",
+                  "updatedAt": "2025-11-15T20:17:16.743Z",
+                  "bgColor": "#dc2626"
+                }
+              },
+              {
+                "id": "n90fsx72s",
+                "type": "paragraph",
+                "props": {
+                  "text": "paragraphe"
+                },
+                "children": [],
+                "meta": {
+                  "bgColor": "#dc2626"
+                }
+              },
+              {
+                "id": "tkk3ir62w",
+                "type": "paragraph",
+                "props": {
+                  "text": ""
+                },
+                "children": []
+              },
+              {
+                "id": "ljyumvc5w",
+                "type": "paragraph",
+                "props": {
+                  "text": ""
+                },
+                "children": []
+              },
+              {
+                "id": "rae60bsx3",
+                "type": "paragraph",
+                "props": {
+                  "text": ""
+                },
+                "children": []
+              },
+              {
+                "id": "xa3p8sybb",
+                "type": "paragraph",
+                "props": {
+                  "text": ""
+                },
+                "children": []
+              },
+              {
+                "id": "qln2xcscy",
+                "type": "paragraph",
+                "props": {
+                  "text": ""
+                },
+                "children": []
+              }
+            ],
+            "width": 50
+          },
+          {
+            "id": "s16nsirzh",
+            "blocks": [
+              {
+                "id": "block_1763237223906_8fazui2p9",
+                "type": "paragraph",
+                "props": {
+                  "text": "paragraphe"
+                },
+                "meta": {
+                  "createdAt": "2025-11-15T20:07:03.906Z",
+                  "updatedAt": "2025-11-15T20:07:24.349Z",
+                  "bgColor": "#dc2626"
+                }
+              }
+            ],
+            "width": 50
+          }
+        ]
+      },
+      "meta": {
+        "createdAt": "2025-11-15T20:17:20.896Z",
+        "updatedAt": "2025-11-15T22:13:34.707Z"
+      }
+    },
+    {
+      "id": "block_1763237641170_alnjnsj8c",
+      "type": "list-item",
+      "props": {
+        "kind": "numbered",
+        "text": "number list 1",
+        "indent": 0,
+        "align": "left",
+        "number": 1
+      },
+      "meta": {
+        "createdAt": "2025-11-15T20:14:01.171Z",
+        "updatedAt": "2025-11-15T20:14:14.163Z",
+        "bgColor": "#dc2626"
+      }
+    },
+    {
+      "id": "block_1763238667046_3xvnp49yo",
+      "type": "heading",
+      "props": {
+        "level": 1,
+        "text": "H2"
+      },
+      "meta": {
+        "createdAt": "2025-11-15T20:31:07.046Z",
+        "updatedAt": "2025-11-15T21:07:39.675Z",
+        "bgColor": "#525252"
+      }
+    },
+    {
+      "id": "block_1763238706236_v3kaqyax7",
+      "type": "heading",
+      "props": {
+        "level": 1,
+        "text": ""
+      },
+      "meta": {
+        "createdAt": "2025-11-15T20:31:46.236Z",
+        "updatedAt": "2025-11-15T21:55:37.233Z"
+      }
+    },
+    {
+      "id": "block_1763238706552_9zpoiafug",
+      "type": "table",
+      "props": {
+        "rows": [
+          {
+            "id": "block_1763248205146_pnw8cifrx",
+            "cells": [
+              {
+                "id": "block_1763248205146_p9wc7se4g",
+                "text": ""
+              }
+            ]
+          }
+        ],
+        "header": false
+      },
+      "meta": {
+        "createdAt": "2025-11-15T20:31:46.552Z",
+        "updatedAt": "2025-11-15T23:10:05.176Z"
+      }
+    },
+    {
+      "id": "block_1763238706720_x5fdjzcm1",
+      "type": "paragraph",
+      "props": {
+        "text": ""
+      },
+      "meta": {
+        "createdAt": "2025-11-15T20:31:46.720Z",
+        "updatedAt": "2025-11-15T20:32:24.875Z"
+      }
+    },
+    {
+      "id": "block_1763238706867_cbgv0yetb",
+      "type": "paragraph",
+      "props": {
+        "text": ""
+      },
+      "meta": {
+        "createdAt": "2025-11-15T20:31:46.867Z",
+        "updatedAt": "2025-11-15T20:31:46.867Z"
+      }
+    },
+    {
+      "id": "block_1763238707162_bh255zvaf",
+      "type": "paragraph",
+      "props": {
+        "text": ""
+      },
+      "meta": {
+        "createdAt": "2025-11-15T20:31:47.162Z",
+        "updatedAt": "2025-11-15T20:31:47.162Z"
+      }
+    },
+    {
+      "id": "block_1763248197366_ynjr796za",
+      "type": "paragraph",
+      "props": {
+        "text": ""
+      },
+      "meta": {
+        "createdAt": "2025-11-15T23:09:57.366Z",
+        "updatedAt": "2025-11-15T23:09:57.366Z"
+      }
+    },
+    {
+      "id": "block_1763248197834_sb477zyix",
+      "type": "paragraph",
+      "props": {
+        "text": ""
+      },
+      "meta": {
+        "createdAt": "2025-11-15T23:09:57.834Z",
+        "updatedAt": "2025-11-15T23:09:57.834Z"
+      }
+    },
+    {
+      "id": "block_1763248198129_38lauudq6",
+      "type": "paragraph",
+      "props": {
+        "text": ""
+      },
+      "meta": {
+        "createdAt": "2025-11-15T23:09:58.130Z",
+        "updatedAt": "2025-11-15T23:09:58.130Z"
+      }
+    },
+    {
+      "id": "block_1763248199064_xs3run960",
+      "type": "paragraph",
+      "props": {
+        "text": ""
+      },
+      "meta": {
+        "createdAt": "2025-11-15T23:09:59.064Z",
+        "updatedAt": "2025-11-15T23:09:59.064Z"
+      }
+    },
+    {
+      "id": "block_1763238707334_uupqjbbia",
+      "type": "paragraph",
+      "props": {
+        "text": ""
+      },
+      "meta": {
+        "createdAt": "2025-11-15T20:31:47.334Z",
+        "updatedAt": "2025-11-15T20:31:47.334Z"
+      }
+    },
+    {
+      "id": "block_1763238707506_lj73550jb",
+      "type": "paragraph",
+      "props": {
+        "text": ""
+      },
+      "meta": {
+        "createdAt": "2025-11-15T20:31:47.506Z",
+        "updatedAt": "2025-11-15T20:31:47.506Z"
+      }
+    }
+  ],
+  "meta": {
+    "createdAt": "2025-11-14T19:38:33.471Z",
+    "updatedAt": "2025-11-15T23:10:05.176Z"
+  }
+}
+```