diff --git a/web/components.yml b/web/components.yml
index caa8912..e387836 100644
--- a/web/components.yml
+++ b/web/components.yml
@@ -39,6 +39,7 @@ local_pages:
   - vpcs
   - subnets
   - vms
+  - account
 
 # Remote pages fetched from git — same mechanism as components.
 #
@@ -68,6 +69,10 @@ menu:
     icon: vm
     children:
       - vms
+  - type: group
+    label: Comptes
+    icon: account
+    children: []
   - type: separator
   - dashboard
   - type: section
diff --git a/web/components/side-nav/side-nav.js b/web/components/side-nav/side-nav.js
index dc105e7..ac49d79 100644
--- a/web/components/side-nav/side-nav.js
+++ b/web/components/side-nav/side-nav.js
@@ -32,13 +32,18 @@ function resolveIcon(name) {
 }
 
 class SideNav extends HTMLElement {
-  #items       = []
-  #expanded    = new Set()   // labels of open groups
-  #hamburger   = null
-  #backdrop    = null
-  #mqHandler   = null
-  #hashHandler = null
-  #isMobile    = false
+  #items          = []
+  #expanded       = new Set()
+  #hamburger      = null
+  #backdrop       = null
+  #mqHandler      = null
+  #hashHandler    = null
+  #isMobile       = false
+  #readyResolve   = null
+
+  // Resolves once navigation.json is loaded and the nav is rendered.
+  // Await this before calling setGroupChildren().
+  ready = new Promise(r => { this.#readyResolve = r })
 
   async connectedCallback() {
     this.attachShadow({ mode: 'open' })
@@ -57,6 +62,7 @@ class SideNav extends HTMLElement {
     }
 
     this.#render()
+    this.#readyResolve()
 
     this.#mqHandler   = () => this.#applyMode()
     this.#hashHandler = () => this.#updateActive()
@@ -72,6 +78,17 @@ class SideNav extends HTMLElement {
     this.#removeBackdrop()
   }
 
+  // ── Public API ──────────────────────────────────────────────────────────────
+
+  // Inject dynamic children into an existing group (identified by label).
+  // Call after awaiting nav.ready.
+  setGroupChildren(label, children) {
+    const group = this.#items.find(i => i.type === 'group' && i.label === label)
+    if (!group) return
+    group.children = children
+    this.#render()
+  }
+
   // ── Rendu des items ─────────────────────────────────────────────────────────
 
   #currentHref() {
diff --git a/web/core/menu.js b/web/core/menu.js
new file mode 100644
index 0000000..0a2adad
--- /dev/null
+++ b/web/core/menu.js
@@ -0,0 +1,37 @@
+// Dynamic menu loader.
+// Fetches data for groups declared with empty children in navigation.json
+// and injects them into side-nav after it is ready.
+//
+// Imported non-blocking from index.html — does not delay routing.
+// Replace MOCK_* with real api-client calls when the backend is ready.
+
+// ── Mock data ────────────────────────────────────────────────────────────────
+
+const MOCK_ACCOUNTS = [
+  { id: 'tresorerie',   name: 'Trésorerie'   },
+  { id: 'charges',      name: 'Charges'       },
+  { id: 'produits',     name: 'Produits'      },
+  { id: 'fournisseurs', name: 'Fournisseurs'  },
+]
+
+async function fetchAccounts() {
+  // TODO: replace with real call
+  // const api = document.querySelector('api-client')
+  // return await api.finance.list('/accounts')
+  await new Promise(r => setTimeout(r, 500))  // simulate network latency
+  return MOCK_ACCOUNTS
+}
+
+// ── Injection ────────────────────────────────────────────────────────────────
+
+const nav = document.querySelector('side-nav')
+if (!nav) throw new Error('menu.js: side-nav not found in DOM')
+
+await nav.ready
+
+const accounts = await fetchAccounts()
+nav.setGroupChildren('Comptes', accounts.map(a => ({
+  label: a.name,
+  href:  `#/account?id=${a.id}`,
+  icon:  'account',
+})))
diff --git a/web/core/router.js b/web/core/router.js
index 06dbe9c..d23777c 100644
--- a/web/core/router.js
+++ b/web/core/router.js
@@ -17,7 +17,8 @@ const MODULE_CACHE = new Map()
 let activeCSS = null
 
 function currentRoute() {
-  return window.location.hash.replace(/^#\//, '') || PAGES[0]?.route || ''
+  const hash = window.location.hash.replace(/^#\//, '') || PAGES[0]?.route || ''
+  return hash.split('?')[0]
 }
 
 async function render(routeName) {
diff --git a/web/index.html b/web/index.html
index 021fb07..1af8dea 100644
--- a/web/index.html
+++ b/web/index.html
@@ -108,6 +108,9 @@
     // then router renders the current route.
     await import('./core/registry.js')
     await import('./core/router.js')
+
+    // Non-blocking: populates dynamic menu groups after routing.
+    import('./core/menu.js')
   </script>
 
 </body>
diff --git a/web/pages/account/account.css b/web/pages/account/account.css
new file mode 100644
index 0000000..b8eb4e4
--- /dev/null
+++ b/web/pages/account/account.css
@@ -0,0 +1,121 @@
+#account-page {
+  width: 100%;
+  display: flex;
+  flex-direction: column;
+  gap: 24px;
+}
+
+/* ── Header ────────────────────────────────────────────────────────────── */
+
+#account-header {
+  display: flex;
+  align-items: flex-start;
+  justify-content: space-between;
+  gap: 16px;
+  background: #1e1e2e;
+  border: 1px solid #313244;
+  border-radius: 10px;
+  padding: 20px 24px;
+}
+
+#account-name {
+  font-size: 20px;
+  font-weight: 600;
+  color: #cdd6f4;
+  margin: 0 0 4px;
+}
+
+#account-id {
+  font-size: 12px;
+  color: #6c7086;
+  font-family: monospace;
+}
+
+#account-balance-block {
+  display: flex;
+  flex-direction: column;
+  align-items: flex-end;
+  gap: 4px;
+}
+
+.balance-label {
+  font-size: 11px;
+  text-transform: uppercase;
+  letter-spacing: 0.08em;
+  color: #6c7086;
+}
+
+#account-balance {
+  font-size: 24px;
+  font-weight: 700;
+  color: #a6e3a1;
+  font-variant-numeric: tabular-nums;
+}
+
+#account-balance.negative { color: #f38ba8; }
+
+/* ── Transactions ───────────────────────────────────────────────────────── */
+
+#account-transactions {
+  background: #1e1e2e;
+  border: 1px solid #313244;
+  border-radius: 10px;
+  padding: 20px 24px;
+}
+
+#account-transactions h3 {
+  font-size: 13px;
+  font-weight: 600;
+  color: #a6adc8;
+  text-transform: uppercase;
+  letter-spacing: 0.08em;
+  margin: 0 0 16px;
+}
+
+#tx-table {
+  width: 100%;
+  border-collapse: collapse;
+  font-size: 14px;
+}
+
+#tx-table th {
+  text-align: left;
+  color: #6c7086;
+  font-weight: 500;
+  font-size: 12px;
+  padding: 0 12px 10px;
+  border-bottom: 1px solid #313244;
+}
+
+#tx-table td {
+  padding: 10px 12px;
+  color: #a6adc8;
+  border-bottom: 1px solid #1e1e2e;
+}
+
+#tx-table tbody tr:last-child td { border-bottom: none; }
+#tx-table tbody tr:hover td { background: #313244; }
+
+.amount-col { text-align: right; }
+
+td.amount { text-align: right; font-variant-numeric: tabular-nums; font-weight: 500; }
+td.amount.positive { color: #a6e3a1; }
+td.amount.negative { color: #f38ba8; }
+
+td.date { color: #6c7086; font-size: 13px; white-space: nowrap; }
+
+/* ── States ─────────────────────────────────────────────────────────────── */
+
+#account-loading {
+  color: #6c7086;
+  font-size: 14px;
+}
+
+#account-error {
+  background: #313244;
+  border: 1px solid #f38ba8;
+  border-radius: 8px;
+  padding: 12px 16px;
+  color: #f38ba8;
+  font-size: 13px;
+}
diff --git a/web/pages/account/account.js b/web/pages/account/account.js
new file mode 100644
index 0000000..bed9af0
--- /dev/null
+++ b/web/pages/account/account.js
@@ -0,0 +1,117 @@
+// Account page.
+// Reads ?id=<account-id> from the URL hash and renders account details.
+// Replace fetchAccount() with a real api-client call when backend is ready.
+
+// ── Mock data ────────────────────────────────────────────────────────────────
+
+const MOCK_DB = {
+  tresorerie: {
+    name: 'Trésorerie',
+    balance: 48_230.50,
+    currency: 'EUR',
+    transactions: [
+      { date: '2026-06-03', label: 'Virement client Martin SA',    amount: +12_000.00 },
+      { date: '2026-06-01', label: 'Virement client Dupont SARL',  amount:  +5_000.00 },
+      { date: '2026-05-30', label: 'Loyer bureau juin',            amount:  -2_500.00 },
+      { date: '2026-05-28', label: 'Facture EDF',                  amount:    -340.20 },
+      { date: '2026-05-25', label: 'Abonnement SaaS infra',        amount:    -189.00 },
+    ],
+  },
+  charges: {
+    name: 'Charges',
+    balance: 12_890.00,
+    currency: 'EUR',
+    transactions: [
+      { date: '2026-06-01', label: 'Salaires mai',                 amount:  -8_500.00 },
+      { date: '2026-05-28', label: 'Assurance professionnelle',    amount:    -420.00 },
+      { date: '2026-05-20', label: 'Formation équipe',             amount:  -1_200.00 },
+    ],
+  },
+  produits: {
+    name: 'Produits',
+    balance: 67_450.00,
+    currency: 'EUR',
+    transactions: [
+      { date: '2026-06-02', label: 'Facture client #2024-089',     amount: +18_000.00 },
+      { date: '2026-05-29', label: 'Facture client #2024-088',     amount:  +9_500.00 },
+      { date: '2026-05-22', label: 'Avoir client Dupont',          amount:    -500.00 },
+    ],
+  },
+  fournisseurs: {
+    name: 'Fournisseurs',
+    balance: -8_340.00,
+    currency: 'EUR',
+    transactions: [
+      { date: '2026-06-01', label: 'Facture Tech Components SAS',  amount:  -3_200.00 },
+      { date: '2026-05-27', label: 'Règlement fournisseur Leroy',  amount:  +2_000.00 },
+      { date: '2026-05-20', label: 'Facture Bureau & Co',          amount:    -640.00 },
+    ],
+  },
+}
+
+async function fetchAccount(id) {
+  // TODO: replace with real call
+  // const api = document.querySelector('api-client')
+  // return await api.finance.get(`/accounts/${id}`)
+  await new Promise(r => setTimeout(r, 300))
+  const data = MOCK_DB[id]
+  if (!data) throw new Error(`Compte introuvable : ${id}`)
+  return data
+}
+
+// ── Helpers ──────────────────────────────────────────────────────────────────
+
+function formatAmount(amount, currency) {
+  return new Intl.NumberFormat('fr-FR', { style: 'currency', currency }).format(amount)
+}
+
+function formatDate(iso) {
+  return new Intl.DateTimeFormat('fr-FR', { day: '2-digit', month: 'short', year: 'numeric' }).format(new Date(iso))
+}
+
+// ── Init ─────────────────────────────────────────────────────────────────────
+
+export function init(main) {
+  const params  = new URLSearchParams(window.location.hash.split('?')[1])
+  const id      = params.get('id')
+
+  const loading = main.querySelector('#account-loading')
+  const error   = main.querySelector('#account-error')
+
+  if (!id) {
+    loading.style.display = 'none'
+    error.style.display   = 'block'
+    error.textContent     = 'Aucun compte sélectionné.'
+    return
+  }
+
+  fetchAccount(id)
+    .then(data  => render(main, id, data))
+    .catch(err  => {
+      loading.style.display = 'none'
+      error.style.display   = 'block'
+      error.textContent     = err.message
+    })
+}
+
+function render(main, id, data) {
+  main.querySelector('#account-loading').style.display = 'none'
+
+  main.querySelector('#account-name').textContent = data.name
+  main.querySelector('#account-id').textContent   = id
+
+  const balanceEl = main.querySelector('#account-balance')
+  balanceEl.textContent = formatAmount(data.balance, data.currency)
+  balanceEl.classList.toggle('negative', data.balance < 0)
+
+  const tbody = main.querySelector('#tx-body')
+  tbody.innerHTML = data.transactions.map(tx => `
+    <tr>
+      <td class="date">${formatDate(tx.date)}</td>
+      <td>${tx.label}</td>
+      <td class="amount ${tx.amount >= 0 ? 'positive' : 'negative'}">
+        ${formatAmount(tx.amount, data.currency)}
+      </td>
+    </tr>
+  `).join('')
+}
diff --git a/web/pages/account/index.html b/web/pages/account/index.html
new file mode 100644
index 0000000..9d40142
--- /dev/null
+++ b/web/pages/account/index.html
@@ -0,0 +1,29 @@
+<div id="account-page">
+  <div id="account-header">
+    <div id="account-title">
+      <h2 id="account-name"></h2>
+      <span id="account-id"></span>
+    </div>
+    <div id="account-balance-block">
+      <span class="balance-label">Solde</span>
+      <span id="account-balance"></span>
+    </div>
+  </div>
+
+  <section id="account-transactions">
+    <h3>Transactions récentes</h3>
+    <table id="tx-table">
+      <thead>
+        <tr>
+          <th>Date</th>
+          <th>Libellé</th>
+          <th class="amount-col">Montant</th>
+        </tr>
+      </thead>
+      <tbody id="tx-body"></tbody>
+    </table>
+  </section>
+
+  <div id="account-error" style="display:none"></div>
+  <div id="account-loading">Chargement…</div>
+</div>
diff --git a/web/pages/account/manifest.json b/web/pages/account/manifest.json
new file mode 100644
index 0000000..9226d9d
--- /dev/null
+++ b/web/pages/account/manifest.json
@@ -0,0 +1,5 @@
+{
+  "route": "account",
+  "label": "Compte",
+  "icon": "account"
+}