diff --git a/gerbil-manager-web/src/components/BreedingResultView.tsx b/gerbil-manager-web/src/components/BreedingResultView.tsx
index 207c583..b757fc9 100644
--- a/gerbil-manager-web/src/components/BreedingResultView.tsx
+++ b/gerbil-manager-web/src/components/BreedingResultView.tsx
@@ -43,16 +43,29 @@ export default function BreedingResultView({ result, title }: BreedingResultView
       ) : (
         <>
           <ul className="farbschlag-cards">
-            {result.byFarbschlag.map((f) => (
-              <li key={f.farbschlag} className="farbschlag-card">
-                <FarbschlagImage name={f.farbschlag} />
-                <span className="farbschlag-card__name">{f.farbschlag}</span>
-                <span className="farbschlag-card__prob">
-                  {f.probability.percent}
-                  <small> ({f.probability.text})</small>
-                </span>
-              </li>
-            ))}
+            {result.byFarbschlag.map((f) => {
+              // Representative genotype: highest-prob offspring for this farbschlag.
+              const repGenotype = result.offspring.find(
+                (o) => o.farbschlag === f.farbschlag,
+              )?.genotype
+              return (
+                <li key={f.farbschlag} className="farbschlag-card">
+                  <div className="farbschlag-card__img">
+                    <FarbschlagImage name={f.farbschlag} />
+                  </div>
+                  <div className="farbschlag-card__body">
+                    <span className="farbschlag-card__name">{f.farbschlag}</span>
+                    {repGenotype && (
+                      <code className="farbschlag-card__geno">{repGenotype}</code>
+                    )}
+                  </div>
+                  <span className="farbschlag-card__prob">
+                    {f.probability.percent}
+                    <small> ({f.probability.text})</small>
+                  </span>
+                </li>
+              )
+            })}
           </ul>
 
           <button
diff --git a/gerbil-manager-web/src/genetics/__tests__/genetics.test.ts b/gerbil-manager-web/src/genetics/__tests__/genetics.test.ts
index 2a2aa22..7180a70 100644
--- a/gerbil-manager-web/src/genetics/__tests__/genetics.test.ts
+++ b/gerbil-manager-web/src/genetics/__tests__/genetics.test.ts
@@ -179,17 +179,21 @@ describe('Farbschlag catalog', () => {
     expect(match.name).toBe('Unbekannter Farbschlag')
   })
 
-  it('has the expected catalogue coverage (GEN-3g: 66 after adding CP-*-Hell het variants)', () => {
-    // GEN-3f: 73 -> 61 (cchm CP reconciliation).
-    // GEN-3g: +5 het variants (CP-Agouti/Silberagouti/Algierfuchs/Polarfuchs/Orangeschimmel -Hell),
-    // giving 61 + 5 = 66. CP-Fuchs-Hell was already counted.
-    expect(CATALOG_SIZE).toBe(66)
+  it('has the expected catalogue coverage (GEN-4: 70 after adding 4 dilute-fox entries)', () => {
+    // GEN-3f: 73 -> 61. GEN-3g: +5 -> 66. GEN-4: +4 (Dilute Algierfuchs/Goldfuchs/Rotfuchs/Polarfuchs) -> 70.
+    expect(CATALOG_SIZE).toBe(70)
   })
 
   it('frozen contract names round-trip to themselves (DB-key guard)', () => {
     // The first 18 are the frozen ColorVariety keys — their representative
     // genotype MUST resolve back to their own name, never a later variety.
+    // GEN-4 exception: 'Pink Eyed White (PEW)' (ch/ch+pp) now computes 'REW'
+    // because the REW engine check (both C-alleles reduced + pp) fires first.
+    // PEW stays in the catalog as a user-pickable import name; its computed
+    // farbschlag is intentionally 'REW' per Julian's extended rule.
+    const REW_SHADOWED = new Set(['Pink Eyed White (PEW)'])
     for (const entry of BASE_COLORS.slice(0, FROZEN_COUNT)) {
+      if (REW_SHADOWED.has(entry.name)) continue
       expect(genotypeToFarbschlag(representativeGenotype(entry))).toBe(entry.name)
     }
   })
@@ -421,7 +425,8 @@ describe('GEN-3e: C-locus colourpoint naming', () => {
     expect(name('AA cchmch DD EE gg PP spsp rere')).toBe('CP-Silberagouti-Hell')
     expect(name('AA cchmch DD ee GG PP spsp rere')).toBe('CP-Algierfuchs-Hell')
     expect(name('AA cchmch DD ee gg PP spsp rere')).toBe('CP-Polarfuchs-Hell')
-    expect(name('AA cchmch dd ee GG PP spsp rere')).toBe('CP-Fuchs-Hell')
+    // GEN-4: dd base = 'Dilute Algierfuchs' → 'Dilute CP-Algierfuchs-Hell'
+    expect(name('AA cchmch dd ee GG PP spsp rere')).toBe('Dilute CP-Algierfuchs-Hell')
   })
 
   it('aa fixed colourpoint names (Marder/Siam/Zobel/Zobel-Hell)', () => {
@@ -471,8 +476,8 @@ describe('GEN-3f: CP catalog reconciled to the breeder CP- naming (matches her l
     expect(name('AA cchmcchm DD EE gg PP spsp rere')).toBe('CP-Silberagouti')
     expect(name('AA cchmcchm DD ee GG PP spsp rere')).toBe('CP-Algierfuchs')
     expect(name('AA cchmcchm DD ee gg PP spsp rere')).toBe('CP-Polarfuchs')
-    // dd agouti fox has no dedicated base -> the eFamily fallback yields 'CP-Fuchs'.
-    expect(name('AA cchmcchm dd ee GG PP spsp rere')).toBe('CP-Fuchs')
+    // GEN-4: dd+ee base = 'Dilute Algierfuchs' -> 'Dilute CP-Algierfuchs' (no more CP-Fuchs catch-all).
+    expect(name('AA cchmcchm dd ee GG PP spsp rere')).toBe('Dilute CP-Algierfuchs')
     // A- cchm efef -> CP-Orangeschimmel (Schimmel base under full C).
     expect(name('AA cchmcchm DD efef GG PP spsp rere')).toBe('CP-Orangeschimmel')
   })
@@ -481,11 +486,12 @@ describe('GEN-3f: CP catalog reconciled to the breeder CP- naming (matches her l
     const siam = BASE_COLORS.find((e) => e.name === 'Siam')!
     const zh = BASE_COLORS.find((e) => e.name === 'Zobel-Hell')!
     const cpah = BASE_COLORS.find((e) => e.name === 'CP-Agouti-Hell')!
+    // GEN-4: CP-Fuchs-Hell kept for import/hand-pick but engine now returns the specific name.
     const cpfh = BASE_COLORS.find((e) => e.name === 'CP-Fuchs-Hell')!
     expect(genotypeToFarbschlag(representativeGenotype(siam))).toBe('Siam')
     expect(genotypeToFarbschlag(representativeGenotype(zh))).toBe('Zobel-Hell')
     expect(genotypeToFarbschlag(representativeGenotype(cpah))).toBe('CP-Agouti-Hell')
-    expect(genotypeToFarbschlag(representativeGenotype(cpfh))).toBe('CP-Fuchs-Hell')
+    expect(genotypeToFarbschlag(representativeGenotype(cpfh))).toBe('Dilute CP-Algierfuchs-Hell')
   })
 })
 
@@ -507,7 +513,8 @@ describe('GEN-3g: "-Hell" in variety name == cchm/ch het; hom == cchm/cchm', ()
     expect(name('AA cchmch DD EE gg PP spsp rere')).toBe('CP-Silberagouti-Hell')
     expect(name('AA cchmch DD ee GG PP spsp rere')).toBe('CP-Algierfuchs-Hell')
     expect(name('AA cchmch DD ee gg PP spsp rere')).toBe('CP-Polarfuchs-Hell')
-    expect(name('AA cchmch dd ee GG PP spsp rere')).toBe('CP-Fuchs-Hell')
+    // GEN-4: dd+ee base = 'Dilute Algierfuchs' → prefix ordering: 'Dilute CP-Algierfuchs-Hell'
+    expect(name('AA cchmch dd ee GG PP spsp rere')).toBe('Dilute CP-Algierfuchs-Hell')
     expect(name('AA cchmch DD efef GG PP spsp rere')).toBe('CP-Orangeschimmel-Hell')
   })
 
@@ -525,6 +532,43 @@ describe('GEN-3g: "-Hell" in variety name == cchm/ch het; hom == cchm/cchm', ()
   })
 })
 
+describe('GEN-4: Dilute prefix, REW, no-bare-Fuchs', () => {
+  const name = (s: string) => genotypeToFarbschlag(fromDisplayString(s))
+
+  it('dd entries use Dilute prefix — no more X-dd names', () => {
+    expect(name('AA CC dd EE GG PP spsp rere')).toBe('Dilute Agouti')
+    expect(name('aa CC dd EE gg PP spsp rere')).toBe('Dilute Anthrazit')
+    expect(name('aa CC dd ee GG PP spsp rere')).toBe('Dilute Kohlfuchs')
+    expect(name('aa CC dd ee gg pp spsp rere')).toBe('Dilute Blaufuchs')
+    expect(name('AA CC dd EE GG pp spsp rere')).toBe('Dilute Gold')
+    expect(name('aa CC dd EE GG pp spsp rere')).toBe('Dilute Platin')
+  })
+
+  it('REW: both C alleles reduced (no full C) + pp = REW — all three cases (Julian confirmed)', () => {
+    // hom cchm/cchm + pp
+    expect(name('AA cchmcchm DD EE GG pp spsp rere')).toBe('REW')  // CP-Gold
+    expect(name('AA cchmcchm DD ee GG pp spsp rere')).toBe('REW')  // CP-Goldfuchs
+    expect(name('AA cchmcchm DD EE gg pp spsp rere')).toBe('REW')  // CP-Elfenbein
+    expect(name('AA cchmcchm DD ee gg pp spsp rere')).toBe('REW')  // CP-Apricot
+    expect(name('AA cchmcchm dd EE GG pp spsp rere')).toBe('REW')  // CP-dd Gold
+    // het cchm/ch + pp (Julian: also REW)
+    expect(name('AA cchmch DD EE GG pp spsp rere')).toBe('REW')
+    // ch/ch + pp (Julian: also REW — subsumes PEW)
+    expect(name('AA chch DD EE GG pp spsp rere')).toBe('REW')
+    expect(name('aa chch DD EE GG pp spsp rere')).toBe('REW')
+    // Counterproof: full C present → NOT REW (residual pigment)
+    expect(name('AA Ccchm DD EE GG pp spsp rere')).not.toBe('REW') // Cc[chm] + pp = Gold-like
+    expect(name('AA Cch DD EE GG pp spsp rere')).not.toBe('REW')   // Cc[h] + pp
+  })
+
+  it('bare Fuchs never appears — dilute-fox combinations are named specifically', () => {
+    expect(name('AA CC dd ee GG PP spsp rere')).toBe('Dilute Algierfuchs')
+    expect(name('AA CC dd ee GG pp spsp rere')).toBe('Dilute Goldfuchs')
+    expect(name('aa CC dd ee GG pp spsp rere')).toBe('Dilute Rotfuchs')
+    expect(name('AA CC dd ee gg PP spsp rere')).toBe('Dilute Polarfuchs')
+  })
+})
+
 describe('GEN-3h: breeder bracket-notation display + E-locus e-before-ef order', () => {
   // ── Display symbols ────────────────────────────────────────────────────
   it('ef displays as e[f], cchm as c[chm], ch as c[h]', () => {
diff --git a/gerbil-manager-web/src/genetics/catalog.ts b/gerbil-manager-web/src/genetics/catalog.ts
index 677c733..786f3f9 100644
--- a/gerbil-manager-web/src/genetics/catalog.ts
+++ b/gerbil-manager-web/src/genetics/catalog.ts
@@ -66,8 +66,8 @@ export const BASE_COLORS: readonly FarbschlagEntry[] = [
   { name: 'Platin', english: 'Lilac', tokens: { A: 'a', C: 'C', D: 'D', E: 'E', G: 'G', P: 'p' }, image: 'platin.JPG' },
   { name: 'Goldfuchs', english: 'Yellow Fox', tokens: { A: 'A', C: 'C', D: 'D', E: 'e', G: 'G', P: 'p' }, image: 'goldfuchs.jpg' },
   { name: 'Rotfuchs', english: 'Argente Nutmeg', tokens: { A: 'a', C: 'C', D: 'D', E: 'e', G: 'G', P: 'p' }, image: 'rotfuchs.JPG' },
-  { name: 'dd Gold', english: 'dd Argente Golden', tokens: { A: 'A', C: 'C', D: 'd', E: 'E', G: 'G', P: 'p' }, image: 'gold-dd.jpg' },
-  { name: 'dd Platin', english: 'dd Lilac', tokens: { A: 'a', C: 'C', D: 'd', E: 'E', G: 'G', P: 'p' }, image: 'platin-dd.jpg' },
+  { name: 'Dilute Gold', english: 'dd Argente Golden', tokens: { A: 'A', C: 'C', D: 'd', E: 'E', G: 'G', P: 'p' }, image: 'gold-dd.jpg' },
+  { name: 'Dilute Platin', english: 'dd Lilac', tokens: { A: 'a', C: 'C', D: 'd', E: 'E', G: 'G', P: 'p' }, image: 'platin-dd.jpg' },
 
   // ── baseportal.de varieties (GEN-2), normalized to the frozen allele table ──
   { name: 'Altweiss (REW)', tokens: { A: 'a', C: 'C', D: 'D', E: 'E', G: 'g', P: 'p' }, image: 'altweiss-rew.jpeg' },
@@ -82,10 +82,16 @@ export const BASE_COLORS: readonly FarbschlagEntry[] = [
   { name: 'Orangeschimmel', tokens: { C: 'C', D: 'D', E: 'ef', G: 'G', P: 'P' }, image: 'schimmel-orangeschimmel.jpg' },
   { name: 'Topas', tokens: { A: 'A', C: 'C', D: 'D', E: 'E', G: 'G', P: 'p' }, image: 'topas.jpg' },
   { name: 'Platin-Hell', tokens: { A: 'a', C: 'C', D: 'D', E: 'E', G: 'G', P: 'p' }, image: 'platin-hell.jpg' },
-  { name: 'Agouti dd', tokens: { A: 'A', C: 'C', D: 'd', E: 'E', G: 'G', P: 'P' }, image: 'agouti-dd.jpg' },
-  { name: 'Silberagouti dd', tokens: { A: 'A', C: 'C', D: 'd', E: 'E', G: 'g', P: 'P' }, image: 'silberagouti-dd.jpg' },
-  { name: 'Kohlfuchs dd', tokens: { A: 'a', C: 'C', D: 'd', E: 'e', G: 'G', P: 'P' }, image: 'kohlfuchs-dd.jpg' },
-  { name: 'Anthrazit dd', tokens: { A: 'a', C: 'C', D: 'd', E: 'E', G: 'g', P: 'P' }, image: 'anthrazit-dd.jpg' },
+  { name: 'Dilute Agouti', tokens: { A: 'A', C: 'C', D: 'd', E: 'E', G: 'G', P: 'P' }, image: 'agouti-dd.jpg' },
+  { name: 'Dilute Silberagouti', tokens: { A: 'A', C: 'C', D: 'd', E: 'E', G: 'g', P: 'P' }, image: 'silberagouti-dd.jpg' },
+  { name: 'Dilute Kohlfuchs', tokens: { A: 'a', C: 'C', D: 'd', E: 'e', G: 'G', P: 'P' }, image: 'kohlfuchs-dd.jpg' },
+  { name: 'Dilute Anthrazit', tokens: { A: 'a', C: 'C', D: 'd', E: 'E', G: 'g', P: 'P' }, image: 'anthrazit-dd.jpg' },
+  // GEN-4: dilute fox base entries — prevent bare 'Fuchs' family fallback for
+  // agouti+dilute+fox combinations not otherwise covered in the catalog.
+  { name: 'Dilute Algierfuchs', tokens: { A: 'A', C: 'C', D: 'd', E: 'e', G: 'G', P: 'P' } },
+  { name: 'Dilute Goldfuchs', tokens: { A: 'A', C: 'C', D: 'd', E: 'e', G: 'G', P: 'p' } },
+  { name: 'Dilute Rotfuchs', tokens: { A: 'a', C: 'C', D: 'd', E: 'e', G: 'G', P: 'p' } },
+  { name: 'Dilute Polarfuchs', tokens: { A: 'A', C: 'C', D: 'd', E: 'e', G: 'g', P: 'P' } },
   // GEN-3a: efef gg base = Silberschimmel (breeder C5) — listed before the
   // A-specific Polarfuchsschimmel so the canonical efef-gg reverse-matches here.
   { name: 'Silberschimmel', tokens: { C: 'C', D: 'D', E: 'ef', G: 'g', P: 'P' }, image: 'silberschimmel.jpg' },
@@ -104,8 +110,8 @@ export const BASE_COLORS: readonly FarbschlagEntry[] = [
   { name: 'Rotfuchs, hell', tokens: { A: 'a', C: 'C', D: 'D', E: 'e', G: 'G', P: 'p' }, image: 'rotfuchs-hell.jpg' },
   { name: 'Kohlfuchs-Hell', tokens: { A: 'a', C: 'C', D: 'D', E: 'e', G: 'G', P: 'P' }, image: 'kohlfuchs-hell-2.jpg' },
   { name: 'Algierfuchs, hell', tokens: { A: 'A', C: 'C', D: 'D', E: 'e', G: 'G', P: 'P' }, image: 'algierfuchs-hell.JPG' },
-  { name: 'Topas dd', tokens: { A: 'A', C: 'C', D: 'd', E: 'E', G: 'G', P: 'p' }, image: 'topas-dd.jpg' },
-  { name: 'Blaufuchs dd', tokens: { A: 'a', C: 'C', D: 'd', E: 'e', G: 'g', P: 'p' }, image: 'blaufuchs-dd.jpg' },
+  { name: 'Dilute Topas', tokens: { A: 'A', C: 'C', D: 'd', E: 'E', G: 'G', P: 'p' }, image: 'topas-dd.jpg' },
+  { name: 'Dilute Blaufuchs', tokens: { A: 'a', C: 'C', D: 'd', E: 'e', G: 'g', P: 'p' }, image: 'blaufuchs-dd.jpg' },
 
   // ── GEN-3f/3g: c^chm colourpoint varieties ──
   // GEN-3f: aa points = marten/sable group (Marder/Siam, +gg Zobel/Zobel-Hell).
@@ -233,7 +239,13 @@ function colourpointName(g: Genotype): string | null {
   }
   // A- colourpoint: base as if C were full; het (cchm/ch) -> '-Hell' suffix.
   const base = baseColourFor(makeGenotype({ ...g, C: ['C', 'C'] }))
-  return base ? `CP-${base}${bothCchm ? '' : '-Hell'}` : null
+  if (!base) return null
+  // GEN-4: if base is a Dilute variety, prefix ordering is 'Dilute CP-X' not 'CP-Dilute X'.
+  const DILUTE = 'Dilute '
+  if (base.startsWith(DILUTE)) {
+    return `${DILUTE}CP-${base.slice(DILUTE.length)}${bothCchm ? '' : '-Hell'}`
+  }
+  return `CP-${base}${bothCchm ? '' : '-Hell'}`
 }
 
 export function farbschlagFor(g: Genotype): FarbschlagMatch {
@@ -241,6 +253,20 @@ export function farbschlagFor(g: Genotype): FarbschlagMatch {
   if (locusToken(g, 'Sp') === 'Sp') modifiers.push('Schecke')
   if (locusToken(g, 'Re') === 'Re') modifiers.push('Rex')
 
+  // GEN-4 REW check (Julian confirmed + extended): both C alleles reduced (no full 'C')
+  // AND pink-eyed (pp) = REW (Rotaugenweiß), A/D/E/G-independent.
+  //   cchm/cchm + pp → REW  (CP varieties with pink-eye)
+  //   cchm/ch  + pp → REW  (het colourpoint + pink-eye)
+  //   ch/ch    + pp → REW  (this also subsumes the frozen 'Pink Eyed White (PEW)' entry)
+  // Counterproof: at least one full 'C' + pp → NOT REW (residual pigment remains).
+  const [c0, c1] = resolvedPair(g, 'C')
+  const [p0, p1] = resolvedPair(g, 'P')
+  const cReduced = (c: string) => c === 'cchm' || c === 'ch'
+  if (cReduced(c0) && cReduced(c1) && p0 === 'p' && p1 === 'p') {
+    const name = ['REW', ...modifiers].join(' ')
+    return { name, base: null, unknown: false }
+  }
+
   const baseName = colourpointName(g) ?? baseColourFor(g)
   if (!baseName) {
     return { name: UNKNOWN_FARBSCHLAG, base: null, unknown: true }
diff --git a/gerbil-manager-web/src/index.css b/gerbil-manager-web/src/index.css
index 115112e..ddece1a 100644
--- a/gerbil-manager-web/src/index.css
+++ b/gerbil-manager-web/src/index.css
@@ -539,28 +539,57 @@ textarea {
   margin: 0.5rem 0 1rem;
   padding: 0;
   display: grid;
-  grid-template-columns: repeat(auto-fill, minmax(13rem, 1fr));
+  /* GEN-4: wider min-width prevents long names (CP-Silberagouti-Hell) from overflowing */
+  grid-template-columns: repeat(auto-fill, minmax(15rem, 1fr));
   gap: 0.5rem;
 }
 
+/* GEN-4 layout fix: image left, body centre (name + genotype stacked), prob right.
+   align-items: stretch so all three columns fill the card height consistently. */
 .farbschlag-card {
   display: flex;
   align-items: center;
-  justify-content: space-between;
   gap: 0.5rem;
   padding: 0.6rem 0.9rem;
   border: 1px solid var(--color-border);
   border-radius: 0.6rem;
   background: var(--color-surface);
+  overflow: hidden; /* contain long genotype strings */
+}
+
+.farbschlag-card__img {
+  flex-shrink: 0;
+}
+
+/* Body takes the middle space and allows wrapping for long names */
+.farbschlag-card__body {
+  flex: 1;
+  min-width: 0; /* allow flex child to shrink below content size */
+  display: flex;
+  flex-direction: column;
+  gap: 0.15rem;
 }
 
 .farbschlag-card__name {
   font-weight: 600;
+  overflow-wrap: break-word;
+  word-break: break-word;
+}
+
+/* Genotype code shown below the name — muted, small, wrappable */
+.farbschlag-card__geno {
+  font-size: 0.7rem;
+  color: var(--color-text-muted, #666);
+  overflow-wrap: break-word;
+  word-break: break-all;
+  opacity: 0.8;
 }
 
 .farbschlag-card__prob {
+  flex-shrink: 0;
   color: var(--color-accent);
   white-space: nowrap;
+  text-align: right;
 }
 
 /* UX-MOBILE-2: scroll wrapper so genotype table scrolls horizontally on mobile