Refactored prose and added style for ToC.astro

src/styles/base/primitives.css

@@ -179,6 +179,10 @@
     --slot-modifier: 1.125rem; /* the +2 / −1 column in contributions */
     --slot-marker: var(--size-5); /* footnote marker column */
     --slot-roll-range: 1.5rem; /* the 4–5 column in a table row */
+    --slot-section-number: 5ch;
+    --slot-prose-marker: 1.625rem;
+    --slot-prose-gap: var(--size-6);
+    --slot-prose-bar: var(--size-8);
 
     /* ═══ MOTION ═══ */
     --motion-fast: 150ms; /* state change: hover, focus, press */
@@ -189,15 +193,12 @@
     --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
 
     /* ═══ LAYOUT ═══ */
-    --layout-max-width: 74rem; /* the tool shell */
-    --layout-content-width: minmax(0, 62ch); /* article measure */
-    --layout-margin-width: minmax(10ch, 1fr);
-    --layout-step-columns: 2;
-    --layout-gutter: var(--size-6); /* between step cards */
-    --layout-section-gap: var(--size-9); /* header to grid */
+    --layout-wrapper-width: 74rem;
+    --layout-rail-width: 12.5rem;
+    --layout-content-width: minmax(0, 62ch);
+    --layout-margin-width: 18rem;
+    --layout-gutter: var(--size-12);
     --layout-page-margin: var(--size-10);
-    --layout-tier-height: 2.25rem;
     --layout-header-height: 3.125rem;
-    --layout-card-min-height: 6.5rem; /* stops grid reflow on resolve */
   }
 }