diff --git a/gerbil-manager-web/src/index.css b/gerbil-manager-web/src/index.css
index 9d7e786..77ed128 100644
--- a/gerbil-manager-web/src/index.css
+++ b/gerbil-manager-web/src/index.css
@@ -347,3 +347,87 @@ textarea {
   gap: 1rem;
   margin: 1.5rem 0;
 }
+
+/* ── Detail page ─────────────────────────────────────────────── */
+
+.head-actions {
+  display: flex;
+  gap: 0.5rem;
+  flex-wrap: wrap;
+}
+
+.def-list {
+  margin: 0.5rem 0 1.5rem;
+}
+
+.def-row {
+  display: grid;
+  grid-template-columns: 1fr;
+  gap: 0.1rem;
+  padding: 0.5rem 0;
+  border-bottom: 1px solid var(--color-border);
+}
+
+.def-row dt {
+  font-size: 0.8rem;
+  color: var(--color-text-muted);
+}
+
+.def-row dd {
+  margin: 0;
+}
+
+.def-row code {
+  background: var(--color-accent-soft);
+  padding: 0.1rem 0.4rem;
+  border-radius: 0.3rem;
+  font-size: 0.95em;
+}
+
+@media (min-width: 768px) {
+  .def-row {
+    grid-template-columns: 14rem 1fr;
+    gap: 1rem;
+    align-items: baseline;
+  }
+}
+
+.tabs {
+  display: flex;
+  gap: 0.25rem;
+  border-bottom: 1px solid var(--color-border);
+  margin-top: 1rem;
+}
+
+.tab {
+  background: none;
+  border: none;
+  border-bottom: 2px solid transparent;
+  padding: 0.6rem 0.9rem;
+  font: inherit;
+  color: var(--color-text-muted);
+  cursor: pointer;
+  min-height: 44px;
+}
+
+.tab--active {
+  color: var(--color-accent);
+  border-bottom-color: var(--color-accent);
+  font-weight: 600;
+}
+
+.tab-panel {
+  padding: 1rem 0;
+}
+
+.visually-hidden {
+  position: absolute;
+  width: 1px;
+  height: 1px;
+  padding: 0;
+  margin: -1px;
+  overflow: hidden;
+  clip: rect(0, 0, 0, 0);
+  white-space: nowrap;
+  border: 0;
+}
diff --git a/gerbil-manager-web/src/pages/GerbilDetailPage.tsx b/gerbil-manager-web/src/pages/GerbilDetailPage.tsx
new file mode 100644
index 0000000..262449f
--- /dev/null
+++ b/gerbil-manager-web/src/pages/GerbilDetailPage.tsx
@@ -0,0 +1,146 @@
+import { useMemo, useState, type ReactNode } from 'react'
+import { Link, useParams } from 'react-router-dom'
+import { de } from '../strings/de'
+import { getGerbil } from '../api/gerbils'
+import { listColorVarieties, listContacts, listEnclosures, listLitters } from '../api/lookups'
+import { useApi } from '../hooks/useApi'
+import { formatDate, genderLabel, statusLabel } from '../format/labels'
+import { fromDisplayString, genotypeToFarbschlag, toDisplayString } from '../genetics'
+
+type DetailTab = 'photos' | 'health' | 'weight'
+
+/** Parse a stored genotype string and derive its normalized form + Farbschlag. */
+function describeGenotype(genotype: string | null): { display: string; farbschlag: string } | null {
+  if (!genotype || !genotype.trim()) return null
+  try {
+    const g = fromDisplayString(genotype)
+    return { display: toDisplayString(g), farbschlag: genotypeToFarbschlag(g) }
+  } catch {
+    // Unparseable: show the raw value, no derived Farbschlag.
+    return { display: genotype, farbschlag: de.genetics.unknownFarbschlag }
+  }
+}
+
+function Row({ label, value }: { label: string; value: ReactNode }) {
+  return (
+    <div className="def-row">
+      <dt>{label}</dt>
+      <dd>{value ?? '—'}</dd>
+    </div>
+  )
+}
+
+export default function GerbilDetailPage() {
+  const t = de.pages.gerbils
+  const { id = '' } = useParams()
+  const [tab, setTab] = useState<DetailTab>('photos')
+
+  const gerbil = useApi(() => getGerbil(id), [id])
+  const colorVarieties = useApi(() => listColorVarieties(), [])
+  const enclosures = useApi(() => listEnclosures(), [])
+  const contacts = useApi(() => listContacts(), [])
+  const litters = useApi(() => listLitters(), [])
+
+  const colorName = useMemo(
+    () => new Map((colorVarieties.data ?? []).map((c) => [c.id, c.name])),
+    [colorVarieties.data],
+  )
+  const enclosureName = useMemo(
+    () => new Map((enclosures.data ?? []).map((e) => [e.id, e.name])),
+    [enclosures.data],
+  )
+  const contactName = useMemo(
+    () => new Map((contacts.data ?? []).map((c) => [c.id, c.name])),
+    [contacts.data],
+  )
+  const litterName = useMemo(
+    () => new Map((litters.data ?? []).map((l) => [l.id, l.name])),
+    [litters.data],
+  )
+
+  if (gerbil.loading) return <p className="muted">{de.common.loading}</p>
+  if (gerbil.error || !gerbil.data) {
+    return (
+      <section className="page">
+        <p className="muted">{gerbil.error ?? t.detail.notFound}</p>
+        <Link to="/rennmaeuse" className="btn">
+          {t.detail.back}
+        </Link>
+      </section>
+    )
+  }
+
+  const g = gerbil.data
+  const geno = describeGenotype(g.genotype)
+  const lookup = (map: Map<string, string>, key: string | null) => (key ? (map.get(key) ?? '—') : '—')
+
+  return (
+    <section className="page">
+      <header className="page-head">
+        <div>
+          <h2>{g.name}</h2>
+          <span className={`badge badge--${g.status.toLowerCase()}`}>{statusLabel(g.status)}</span>
+        </div>
+        <div className="head-actions">
+          <Link to={`/rennmaeuse/${g.id}/bearbeiten`} className="btn btn--primary">
+            {t.detail.edit}
+          </Link>
+          <Link to="/rennmaeuse" className="btn">
+            {t.detail.back}
+          </Link>
+        </div>
+      </header>
+
+      <h3>{t.detail.masterData}</h3>
+      <dl className="def-list">
+        <Row label={t.fields.gender} value={genderLabel(g.gender)} />
+        <Row label={t.fields.status} value={statusLabel(g.status)} />
+        <Row label={t.fields.dateOfBirth} value={formatDate(g.dateOfBirth)} />
+        {g.status === 'Deceased' && (
+          <>
+            <Row label={t.fields.dateOfDeath} value={formatDate(g.dateOfDeath)} />
+            <Row label={t.fields.causeOfDeath} value={g.causeOfDeath} />
+          </>
+        )}
+        {g.status === 'GivenAway' && (
+          <Row label={t.fields.goHomeDate} value={formatDate(g.goHomeDate)} />
+        )}
+        <Row label={t.fields.colorVariety} value={lookup(colorName, g.colorVarietyId)} />
+        <Row label={t.fields.enclosure} value={lookup(enclosureName, g.enclosureId)} />
+        <Row label={t.fields.litter} value={lookup(litterName, g.litterId)} />
+        <Row label={t.fields.origin} value={lookup(contactName, g.originContactId)} />
+        <Row label={t.fields.receiver} value={lookup(contactName, g.receiverContactId)} />
+        <Row label={t.fields.notes} value={g.notes} />
+      </dl>
+
+      <h3>{t.detail.genetics}</h3>
+      {geno ? (
+        <dl className="def-list">
+          <Row label={t.fields.genotype} value={<code>{geno.display}</code>} />
+          <Row label={t.detail.resolvedFarbschlag} value={geno.farbschlag} />
+        </dl>
+      ) : (
+        <p className="muted">{t.detail.genotypeNotSet}</p>
+      )}
+
+      <h3 className="visually-hidden">Weitere Daten</h3>
+      <div className="tabs" role="tablist">
+        {(['photos', 'health', 'weight'] as const).map((key) => (
+          <button
+            key={key}
+            type="button"
+            role="tab"
+            aria-selected={tab === key}
+            className={tab === key ? 'tab tab--active' : 'tab'}
+            onClick={() => setTab(key)}
+          >
+            {t.detail.tabs[key]}
+          </button>
+        ))}
+      </div>
+      <div className="tab-panel" role="tabpanel">
+        <p className="muted">{t.detail.tabPlaceholder}</p>
+      </div>
+    </section>
+  )
+}