diff --git a/src/style.css b/src/style.css
index 2c13f90..44469b5 100644
--- a/src/style.css
+++ b/src/style.css
@@ -1,4 +1,5 @@
 /* ── Reset ── */
+:root { --sidebar-width: 264px; }
 *, *::before, *::after { box-sizing: border-box; }
 ::selection { background: #ffc3c3; }
 html, body { height: 100%; margin: 0; }
@@ -91,6 +92,13 @@ body {
   background: #1a1b2e;
 }
 
+.home-logo {
+  width: 160px;
+  height: 160px;
+  object-fit: contain;
+  margin: 0 0 16px;
+}
+
 .home-title {
   color: #fff;
   font-size: 4rem;
@@ -206,7 +214,7 @@ body {
   position: fixed;
   top: 36px;
   left: 0;
-  width: 264px;
+  width: var(--sidebar-width);
   height: calc(100vh - 36px);
   background: #1a1b2e;
   display: flex;
@@ -215,6 +223,22 @@ body {
   overflow: hidden;
 }
 
+/* Poignée de redimensionnement */
+.sidebar__resizer {
+  position: absolute;
+  top: 0;
+  right: 0;
+  width: 6px;
+  height: 100%;
+  cursor: col-resize;
+  z-index: 100;
+  background: transparent;
+  transition: background 0.15s;
+}
+.sidebar__resizer:hover,
+.sidebar__resizer.is-dragging { background: rgba(129, 140, 248, 0.4); }
+body.is-resizing-sidebar { cursor: col-resize; user-select: none; }
+
 .sidebar__scroll {
   flex: 1;
   min-height: 0;
@@ -315,10 +339,10 @@ body {
 
 .nav-root-link {
   display: block;
-  padding: 7px 24px;
+  padding: 6px 24px;
   color: rgba(255,255,255,0.85);
   text-decoration: none;
-  font-size: 16px;
+  font-size: 14px;
   font-weight: 400;
   line-height: 1.4;
   transition: color 0.2s;
@@ -358,33 +382,32 @@ body {
 .nav-arrow:hover { opacity: 1; background: rgba(255,255,255,0.08); }
 .nav-folder[open] > summary .nav-arrow { transform: rotate(90deg); opacity: 0.8; }
 
+/* Les libellés de dossiers partagent la même police que les fichiers :
+   même taille (14px), même graisse (400), sans majuscules. Seule la flèche ▶
+   distingue visuellement un dossier d'un fichier. */
 .nav-folder-link, .nav-folder-name {
   flex: 1;
   display: block;
   padding: 6px 24px 6px 0;
-  font-size: 11px;
-  font-weight: 700;
-  text-transform: uppercase;
-  letter-spacing: 0.08em;
-  color: rgba(255,255,255,0.35);
+  font-size: 14px;
+  font-weight: 400;
+  line-height: 1.4;
+  color: rgba(255,255,255,0.85);
   text-decoration: none;
   transition: color 0.2s;
   white-space: nowrap;
   overflow: hidden;
   text-overflow: ellipsis;
 }
-.nav-folder-link:hover { color: rgba(255,255,255,0.85); }
+.nav-folder-link:hover { color: #ff5577; }
 .nav-folder-link.active { color: #ff5577; }
 
+/* Dossiers imbriqués : même style que les fichiers imbriqués (couleur atténuée). */
 .nav-folder .nav-folder > summary .nav-folder-link,
 .nav-folder .nav-folder > summary .nav-folder-name {
-  font-size: 13px;
-  font-weight: 500;
-  text-transform: none;
-  letter-spacing: 0;
-  color: rgba(255,255,255,0.45);
+  color: rgba(255,255,255,0.55);
 }
-.nav-folder .nav-folder > summary .nav-folder-link:hover { color: rgba(255,255,255,0.9); }
+.nav-folder .nav-folder > summary .nav-folder-link:hover { color: #ff5577; }
 
 .nav-file-link {
   display: block;
@@ -402,16 +425,16 @@ body {
   font-weight: 500;
 }
 
-.nav-depth-1 > .nav-file-link { padding: 5px 24px 5px 52px; }
+.nav-depth-1 > .nav-file-link { padding: 6px 24px 6px 52px; }
 .nav-depth-1 > .nav-folder > summary { padding-left: 24px; }
-.nav-depth-2 > .nav-file-link { padding: 4px 24px 4px 68px; }
+.nav-depth-2 > .nav-file-link { padding: 6px 24px 6px 68px; }
 .nav-depth-2 > .nav-folder > summary { padding-left: 40px; }
-.nav-depth-3 > .nav-file-link { padding: 4px 24px 4px 84px; }
+.nav-depth-3 > .nav-file-link { padding: 6px 24px 6px 84px; }
 .nav-depth-3 > .nav-folder > summary { padding-left: 56px; }
 
 /* ── Content ── */
 .content {
-  margin-left: 264px;
+  margin-left: var(--sidebar-width);
   padding-top: 48px;
   padding-right: 72px;
   padding-bottom: 96px;
diff --git a/src/ui/sidebar.js b/src/ui/sidebar.js
index f947d66..4973eb3 100644
--- a/src/ui/sidebar.js
+++ b/src/ui/sidebar.js
@@ -1,5 +1,13 @@
 import { escapeHtml } from '../utils.js';
 
+// Tri « naturel » : les préfixes numériques sont comparés comme des nombres
+// (10 vient après 9, pas après 1).
+const collator = new Intl.Collator(undefined, { numeric: true, sensitivity: 'base' });
+
+function cleanLabel(name) {
+  return name.replace(/\.md$/i, '').replace(/-/g, ' ');
+}
+
 function buildTree(relPaths, sep) {
   const tree = { _files: [], _dirs: {} };
   relPaths.forEach((rel) => {
@@ -19,8 +27,11 @@ function renderTree(node, prefix, sep, currentRel, depth) {
   let html = '';
   const depthClass = depth > 0 ? ` class="nav-depth-${Math.min(depth, 3)}"` : '';
 
-  node._files.slice().sort().forEach((rel) => {
-    const label = rel.split(sep).pop().replace(/\.md$/i, '').replace(/-/g, ' ');
+  node._files
+    .slice()
+    .sort((a, b) => collator.compare(a.split(sep).pop(), b.split(sep).pop()))
+    .forEach((rel) => {
+    const label = cleanLabel(rel.split(sep).pop());
     const abs = prefix + rel;
     const cls = rel === currentRel ? ' active' : '';
     if (depth === 0) {
@@ -30,7 +41,7 @@ function renderTree(node, prefix, sep, currentRel, depth) {
     }
   });
 
-  Object.keys(node._dirs).sort().forEach((dirName) => {
+  Object.keys(node._dirs).sort((a, b) => collator.compare(a, b)).forEach((dirName) => {
     const child = node._dirs[dirName];
     const isOpen = currentRel && currentRel.split(sep).includes(dirName);
     const openAttr = isOpen ? ' open' : '';
@@ -40,9 +51,9 @@ function renderTree(node, prefix, sep, currentRel, depth) {
     if (homeFile) {
       const abs = prefix + homeFile;
       const cls = homeFile === currentRel ? ' active' : '';
-      folderLabel = `<a href="#" class="nav-folder-link${cls}" data-path="${escapeHtml(abs)}" onclick="event.stopPropagation()">${escapeHtml(dirName)}</a>`;
+      folderLabel = `<a href="#" class="nav-folder-link${cls}" data-path="${escapeHtml(abs)}" onclick="event.stopPropagation()">${escapeHtml(cleanLabel(dirName))}</a>`;
     } else {
-      folderLabel = `<span class="nav-folder-name">${escapeHtml(dirName)}</span>`;
+      folderLabel = `<span class="nav-folder-name">${escapeHtml(cleanLabel(dirName))}</span>`;
     }
 
     const arrow = `<span class="nav-arrow" onclick="event.preventDefault();event.stopPropagation();var d=this.closest('details');d.open=!d.open">▶</span>`;