WIP accueil : la bande des trois points sous la clé, centrée sur la naissance de l'arche ; marges latérales du dessin rognées

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

web/src/routes/+page.svelte

@@ -47,8 +47,9 @@
   /* The arch, drawn by the sign of the logo (stones in the ink of the mood, the keystone in
      `--cle`), never tilted. Its box is the stone itself: 92 units wide (the base slab, x from
      −46 to 46) and 59 high (y from −40, the top of the keystone, to 19, under the slab); the SVG's
-     own 3-unit margin spills out on every side. On a phone the arch reaches into the side padding,
+     own 3-unit margin spills out above and below (clipped on the sides, where it is empty). On a
-     0.75rem short of the screen's edges, so that the opening keeps as much room as it can. */
+     phone the arch reaches into the side padding, 0.75rem short of the screen's edges, so that the
+     opening keeps as much room as it can. */
   .vault {
     --w: min(34rem, 100vw - 1.5rem);
     container-type: inline-size;
@@ -56,6 +57,7 @@
     width: var(--w);
     margin-inline: calc(50% - var(--w) / 2);
     aspect-ratio: 92 / 59;
+    overflow-x: clip;
     color: var(--ink);
   }
   .sign {
@@ -81,18 +83,18 @@
     );
   }
 
-  /* The three points, sheltered: centred in the opening (x from −19 to 19, a block centred on
+  /* The three points, sheltered: centred in the opening (x from −19 to 19; a band from y = −19,
-     y = −1), one line each. The type follows the arch (cqi): the longest line of the three
+     under the keystone, to 19, centred on the springing line y = 0), one line each. The type
-     languages, 10.8 em, holds in the 38 units of the opening with room to spare. */
+     follows the arch (cqi): the longest line of the three languages, 10.8 em, holds in the
+     38 units of the opening with room to spare. */
   .leitmotiv {
     position: absolute;
-    inset-inline: calc(2700% / 92);
+    inset: calc(2100% / 59) calc(2700% / 92) 0;
-    top: calc(3900% / 59);
-    translate: 0 -50%;
     margin: 0;
     padding: 0;
     list-style: none;
     display: grid;
+    align-content: center;
     justify-items: center;
     gap: 0.2em;
     font-family: var(--font-text);