diff --git a/modele/entete.typ b/modele/entete.typ
index 365fa36..abf605b 100644
--- a/modele/entete.typ
+++ b/modele/entete.typ
@@ -5,20 +5,18 @@
 
 #set page(
   header: context {
-    if counter(page).get().first() > 1 [
-      #set text(size: 8pt, fill: gris-doux)
-      Formation ESP32-S3 avec Arduino Framework
-      #h(1fr)
-      #document.title
-      #v(-4pt)
-      #line(length: 100%, stroke: 0.4pt + gris-doux)
-    ]
+    // Grille plutôt que #h(1fr), que le préambule de Quarto neutralise dans l'en-tête
+    if counter(page).get().first() > 1 {
+      set text(size: 8pt, fill: gris-doux)
+      grid(columns: (1fr, auto), [Formation ESP32-S3 avec Arduino Framework], document.title)
+      v(-4pt)
+      line(length: 100%, stroke: 0.4pt + gris-doux)
+    }
+  },
+  footer: context {
+    set text(size: 8pt, fill: gris-doux)
+    align(right, counter(page).display("1 / 1", both: true))
   },
-  footer: context [
-    #set text(size: 8pt, fill: gris-doux)
-    #h(1fr)
-    #counter(page).display("1 / 1", both: true)
-  ],
 )
 
 #show heading.where(level: 1): it => block(above: 1.6em, below: 0.8em, width: 100%)[
diff --git a/schemas/outils.py b/schemas/outils.py
index 150c5ce..46b6bd5 100644
--- a/schemas/outils.py
+++ b/schemas/outils.py
@@ -12,7 +12,8 @@ CLAIR = {  # fonds pâles associés aux couleurs de la charte
 
 def toile(largeur_cm, hauteur_cm, xmax=None, ymax=None):
     """Figure sans axes, en coordonnées « cm » (1 unité = 1 cm à l'échelle d'origine)."""
-    fig, ax = plt.subplots(figsize=(largeur_cm * CM, hauteur_cm * CM))
+    fig = plt.figure(figsize=(largeur_cm * CM, hauteur_cm * CM))
+    ax = fig.add_axes((0, 0, 1, 1))  # pas de marges : 1 unité = 1 cm, police et boîtes à la même échelle
     ax.set_xlim(0, xmax or largeur_cm)
     ax.set_ylim(0, ymax or hauteur_cm)
     ax.set_aspect("equal")
@@ -27,12 +28,26 @@ def boite(ax, x, y, l, h, texte="", couleur=BLEU, taille=9, gras=False, fond=Non
                                 boxstyle=f"{style},pad=0,rounding_size=0.15" if style == "round" else style,
                                 facecolor=fond, edgecolor=couleur, linewidth=1.4, alpha=alpha))
     if texte:
-        ax.text(x, y, texte, ha="center", va="center", fontsize=taille, color=ENCRE,
-                fontweight="bold" if gras else "normal", linespacing=1.3)
+        t = ax.text(x, y, texte, ha="center", va="center", fontsize=taille, color=ENCRE,
+                    fontweight="bold" if gras else "normal", linespacing=1.3)
+        ajuster_texte(ax, t, l, h)
     return {"c": (x, y), "g": (x - l / 2, y), "d": (x + l / 2, y),
             "h": (x, y + h / 2), "b": (x, y - h / 2)}
 
 
+def ajuster_texte(ax, t, l, h, marge=0.86, taille_min=5.5):
+    """Réduit la police du texte t jusqu'à ce qu'il tienne dans une boîte l × h (unités de données)."""
+    rendu = ax.figure.canvas.get_renderer()
+    ax.apply_aspect()  # sinon la mise à l'échelle « equal » n'est appliquée qu'au rendu final
+    (x0, y0), (x1, y1) = ax.transData.transform([(0, 0), (l, h)])
+    largeur_max, hauteur_max = abs(x1 - x0) * marge, abs(y1 - y0) * marge
+    while t.get_fontsize() > taille_min:
+        ext = t.get_window_extent(rendu)
+        if ext.width <= largeur_max and ext.height <= hauteur_max:
+            break
+        t.set_fontsize(t.get_fontsize() * 0.95)
+
+
 def fleche(ax, depart, arrivee, texte="", couleur=ENCRE, taille=8, double=False, pointille=False,
            cote="haut", decalage=0.18, courbe=0, fond=False):
     """Flèche entre deux points, avec étiquette optionnelle au milieu.
diff --git a/schemas/png/m00-chaine-developpement.png b/schemas/png/m00-chaine-developpement.png
index f673c02..0cd5a06 100644
Binary files a/schemas/png/m00-chaine-developpement.png and b/schemas/png/m00-chaine-developpement.png differ
diff --git a/schemas/png/m01-architecture.png b/schemas/png/m01-architecture.png
index 1e273dd..d17f1c3 100644
Binary files a/schemas/png/m01-architecture.png and b/schemas/png/m01-architecture.png differ
diff --git a/schemas/png/m04-cablage-serie.png b/schemas/png/m04-cablage-serie.png
index fabdeca..0af6ca8 100644
Binary files a/schemas/png/m04-cablage-serie.png and b/schemas/png/m04-cablage-serie.png differ
diff --git a/schemas/png/m05-bus-i2c.png b/schemas/png/m05-bus-i2c.png
index 9aa1062..1d84e80 100644
Binary files a/schemas/png/m05-bus-i2c.png and b/schemas/png/m05-bus-i2c.png differ
diff --git a/schemas/png/m05-bus-spi.png b/schemas/png/m05-bus-spi.png
index 618c3d3..f9b0da7 100644
Binary files a/schemas/png/m05-bus-spi.png and b/schemas/png/m05-bus-spi.png differ
diff --git a/schemas/png/m07-modes-wifi.png b/schemas/png/m07-modes-wifi.png
index 3773eb6..d5b2893 100644
Binary files a/schemas/png/m07-modes-wifi.png and b/schemas/png/m07-modes-wifi.png differ
diff --git a/schemas/png/m07-requete-http.png b/schemas/png/m07-requete-http.png
index ad7d1aa..364cd66 100644
Binary files a/schemas/png/m07-requete-http.png and b/schemas/png/m07-requete-http.png differ
diff --git a/schemas/png/m08-echanges-serveur.png b/schemas/png/m08-echanges-serveur.png
index d9e2075..5737a18 100644
Binary files a/schemas/png/m08-echanges-serveur.png and b/schemas/png/m08-echanges-serveur.png differ
diff --git a/schemas/png/m08-http-vs-websocket.png b/schemas/png/m08-http-vs-websocket.png
index a0549da..23564f6 100644
Binary files a/schemas/png/m08-http-vs-websocket.png and b/schemas/png/m08-http-vs-websocket.png differ
diff --git a/schemas/png/m09-hierarchie-gatt.png b/schemas/png/m09-hierarchie-gatt.png
index b486a2e..41946fe 100644
Binary files a/schemas/png/m09-hierarchie-gatt.png and b/schemas/png/m09-hierarchie-gatt.png differ
diff --git a/schemas/png/m09-sequence-ble.png b/schemas/png/m09-sequence-ble.png
index 9e5495b..0e30c5b 100644
Binary files a/schemas/png/m09-sequence-ble.png and b/schemas/png/m09-sequence-ble.png differ
diff --git a/schemas/png/m11-arborescence-topics.png b/schemas/png/m11-arborescence-topics.png
index a564866..5461f56 100644
Binary files a/schemas/png/m11-arborescence-topics.png and b/schemas/png/m11-arborescence-topics.png differ
diff --git a/schemas/png/m11-publish-subscribe.png b/schemas/png/m11-publish-subscribe.png
index 68ba412..4a29535 100644
Binary files a/schemas/png/m11-publish-subscribe.png and b/schemas/png/m11-publish-subscribe.png differ
diff --git a/schemas/png/m12-demarche-projet.png b/schemas/png/m12-demarche-projet.png
index 19a34f6..28fd462 100644
Binary files a/schemas/png/m12-demarche-projet.png and b/schemas/png/m12-demarche-projet.png differ
diff --git a/schemas/png/m12-structure-projet.png b/schemas/png/m12-structure-projet.png
index 1919517..c83967b 100644
Binary files a/schemas/png/m12-structure-projet.png and b/schemas/png/m12-structure-projet.png differ
diff --git a/schemas/png/m13-parcours-formation.png b/schemas/png/m13-parcours-formation.png
index be26c1c..702c925 100644
Binary files a/schemas/png/m13-parcours-formation.png and b/schemas/png/m13-parcours-formation.png differ
diff --git a/schemas/svg/m00-chaine-developpement.svg b/schemas/svg/m00-chaine-developpement.svg
index cd43b89..7468ff4 100644
--- a/schemas/svg/m00-chaine-developpement.svg
+++ b/schemas/svg/m00-chaine-developpement.svg
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8" standalone="no"?>
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   "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
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+<svg xmlns:xlink="http://www.w3.org/1999/xlink" width="467.943307pt" height="173.140157pt" viewBox="0 0 467.943307 173.140157" xmlns="http://www.w3.org/2000/svg" version="1.1">
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    <cc:Work>
@@ -20,108 +20,108 @@
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  <g id="figure_1">
   <g id="patch_1">
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-L 363.628346 136.629921 
-L 363.628346 0 
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+L 467.943307 0 
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    <g id="text_1">
     <!-- Ordinateur — Arduino IDE -->
-    <g style="fill: #6b7280" transform="translate(20.296063 24.661417) scale(0.09 -0.09)">
+    <g style="fill: #6b7280" transform="translate(24.207874 29.877165) scale(0.09 -0.09)">
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index 5024889..76afa9f 100644
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     <!-- sorties -->
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