Brightness as a continuous rhyme-strength gradient

The fill (and tail underline) now scale through a per-group strength
from the founding key: perfect 1.0, multisyllabic .82, consonant-
backed .7, vowel slant .6, consonance .55, weak ending .5. So the
page reads rhyme quality as a smooth brightness ramp, not just
perfect-vs-slant — the feature, deepened.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

app.py

@@ -1258,8 +1258,15 @@ def analyze(draft: Draft):
         usage[color] += 1
         chosen.append(color)
         sound = re.sub(r"^[a-z0-9]+:", "", g["key"]).replace("|", " ").lower()
+        k = g["key"]
+        strength = (1.0 if k.startswith("p:")        # perfect rime
+                    else 0.82 if k.startswith("m:")   # multisyllabic run
+                    else 0.7 if k.startswith("m2:")   # consonant-backed
+                    else 0.6 if k.startswith("v:")    # vowel slant
+                    else 0.55 if k.startswith("c:")   # consonance
+                    else 0.5)                          # weak ending
         groups_out.append({"id": gid, "color": color, "slant": g["slant"],
-                           "sound": sound})
+                           "sound": sound, "strength": round(strength, 2)})
 
     # stanza rhyme schemes from line-ending groups: the token covering
     # the most of the line's tail owns the slot — Em rhymes "-cock it",

static/index.html

@@ -636,7 +636,8 @@ function render(){
                   : (p && (focusGid === null || p.g === focusGid)) ? p
                   : (w || p);
           let alpha = !t.ph ? (t.end ? 34 : 19) : (t.end ? 24 : 14);
-          if(t.slant) alpha = Math.round(alpha * 0.62);  // slant sits back
+          const str = (groupInfo[t.g] && groupInfo[t.g].strength) || 1;
+          alpha = Math.round(alpha * (0.45 + 0.55 * str));  // brightness = rhyme strength
           if(focusGid !== null && t.g === focusGid){
             alpha = Math.min(85, Math.round(alpha * 2.8));
             style += 'color:#1a120c;font-weight:600;';  // dark ink on the lit chip
@@ -645,7 +646,7 @@ function render(){
           // faint underline on the rhyming tail (rs..e) of a word — a
           // whisper of precision under the full-word fill
           if(w && w.rs != null && a >= w.rs){
-            const u = w.slant ? 28 : 42;
+            const u = Math.round(42 * ((groupInfo[w.g] && groupInfo[w.g].strength) || 1));
             shadows.push(`inset 0 -1.5px 0 0 color-mix(in srgb, ${colorOf(w)} ${u}%, transparent)`);
           }
         }else if(op){