diff --git a/README.md b/README.md
index b59bff8..67a58d2 100644
--- a/README.md
+++ b/README.md
@@ -18,5 +18,8 @@ Beim ersten Start wird die Datenbank mit einigen Beispielkonten angelegt.
 * Gewinn- und Verlustrechnung
 * Bilanz
 * Umsatzsteuervoranmeldung
+* Modernes, responsives Frontend mit Vue unter `/vue_app`
+
+Das Layout verwendet ein Bootswatch-Theme, wodurch die Anwendung auch auf Handy und Tablet gut aussieht.
 
 Die Umsetzung dient nur als Demonstration und ist nicht für den produktiven Einsatz geeignet.
diff --git a/app/routes.py b/app/routes.py
index 3353bd0..ca6b62f 100644
--- a/app/routes.py
+++ b/app/routes.py
@@ -1,4 +1,4 @@
-from flask import render_template, request, redirect, url_for
+from flask import render_template, request, redirect, url_for, jsonify
 from . import app, db
 from .models import Account, Entry
 
@@ -6,6 +6,10 @@
 def index():
     return render_template('index.html')
 
+@app.route('/vue_app')
+def vue_app():
+    return render_template('vue_app.html')
+
 @app.route('/accounts')
 def accounts():
     accounts = Account.query.order_by(Account.number).all()
@@ -26,6 +30,37 @@ def entries():
     entries = Entry.query.order_by(Entry.entry_date.desc()).all()
     return render_template('entries.html', entries=entries, accounts=accounts)
 
+@app.route('/api/accounts')
+def api_accounts():
+    accounts = Account.query.order_by(Account.number).all()
+    return jsonify([{'id': a.id, 'number': a.number, 'name': a.name, 'type': a.type} for a in accounts])
+
+@app.route('/api/entries', methods=['GET', 'POST'])
+def api_entries():
+    if request.method == 'POST':
+        data = request.get_json()
+        entry = Entry(
+            debit_id=data['debit_id'],
+            credit_id=data['credit_id'],
+            amount=data['amount'],
+            description=data.get('description', '')
+        )
+        db.session.add(entry)
+        db.session.commit()
+        return jsonify({'status': 'success'})
+    entries = Entry.query.order_by(Entry.entry_date.desc()).all()
+    result = []
+    for e in entries:
+        result.append({
+            'id': e.id,
+            'entry_date': e.entry_date.isoformat(),
+            'description': e.description,
+            'debit': {'id': e.debit.id, 'number': e.debit.number, 'name': e.debit.name},
+            'credit': {'id': e.credit.id, 'number': e.credit.number, 'name': e.credit.name},
+            'amount': e.amount
+        })
+    return jsonify(result)
+
 @app.route('/profit_loss')
 def profit_loss():
     income_accounts = Account.query.filter(Account.type=='income').all()
diff --git a/app/static/js/app.js b/app/static/js/app.js
new file mode 100644
index 0000000..1c881c1
--- /dev/null
+++ b/app/static/js/app.js
@@ -0,0 +1,38 @@
+const { createApp } = Vue;
+
+createApp({
+  data() {
+    return {
+      accounts: [],
+      entries: [],
+      newEntry: {
+        debit_id: '',
+        credit_id: '',
+        amount: '',
+        description: ''
+      }
+    };
+  },
+  methods: {
+    fetchAccounts() {
+      axios.get('/api/accounts').then(res => {
+        this.accounts = res.data;
+      });
+    },
+    fetchEntries() {
+      axios.get('/api/entries').then(res => {
+        this.entries = res.data;
+      });
+    },
+    addEntry() {
+      axios.post('/api/entries', this.newEntry).then(() => {
+        this.fetchEntries();
+        this.newEntry = { debit_id: '', credit_id: '', amount: '', description: '' };
+      });
+    }
+  },
+  mounted() {
+    this.fetchAccounts();
+    this.fetchEntries();
+  }
+}).mount('#app');
diff --git a/app/templates/accounts.html b/app/templates/accounts.html
index 0365208..0e16def 100644
--- a/app/templates/accounts.html
+++ b/app/templates/accounts.html
@@ -1,10 +1,14 @@
 {% extends 'base.html' %}
 {% block content %}
-<h2>Konten</h2>
-<table border="1">
-<tr><th>Nummer</th><th>Name</th><th>Typ</th></tr>
-{% for acc in accounts %}
-<tr><td>{{ acc.number }}</td><td>{{ acc.name }}</td><td>{{ acc.type }}</td></tr>
-{% endfor %}
+<h2 class="mb-3">Konten</h2>
+<table class="table table-striped table-bordered">
+  <thead>
+    <tr><th>Nummer</th><th>Name</th><th>Typ</th></tr>
+  </thead>
+  <tbody>
+    {% for acc in accounts %}
+    <tr><td>{{ acc.number }}</td><td>{{ acc.name }}</td><td>{{ acc.type }}</td></tr>
+    {% endfor %}
+  </tbody>
 </table>
 {% endblock %}
diff --git a/app/templates/balance.html b/app/templates/balance.html
index 1f89a43..a39ec6f 100644
--- a/app/templates/balance.html
+++ b/app/templates/balance.html
@@ -1,18 +1,22 @@
 {% extends 'base.html' %}
 {% block content %}
-<h2>Bilanz</h2>
-<table border="1">
-<tr><th>Aktiva</th><th>Betrag</th><th>Passiva</th><th>Betrag</th></tr>
-{% for left, right in rows %}
-<tr>
-  <td>{{ left.name if left else '' }}</td>
-  <td>{{ '%.2f'|format(left.amount) if left else '' }}</td>
-  <td>{{ right.name if right else '' }}</td>
-  <td>{{ '%.2f'|format(right.amount) if right else '' }}</td>
-</tr>
-{% endfor %}
-<tr><td><strong>Summe Aktiva</strong></td><td>{{ '%.2f'|format(asset_total) }}</td>
-    <td><strong>Summe Passiva</strong></td><td>{{ '%.2f'|format(liability_total) }}</td></tr>
-<tr><td colspan="2"></td><td><strong>Eigenkapital</strong></td><td>{{ '%.2f'|format(equity) }}</td></tr>
+<h2 class="mb-3">Bilanz</h2>
+<table class="table table-striped table-bordered">
+  <thead>
+    <tr><th>Aktiva</th><th>Betrag</th><th>Passiva</th><th>Betrag</th></tr>
+  </thead>
+  <tbody>
+    {% for left, right in rows %}
+    <tr>
+      <td>{{ left.name if left else '' }}</td>
+      <td>{{ '%.2f'|format(left.amount) if left else '' }}</td>
+      <td>{{ right.name if right else '' }}</td>
+      <td>{{ '%.2f'|format(right.amount) if right else '' }}</td>
+    </tr>
+    {% endfor %}
+    <tr><td><strong>Summe Aktiva</strong></td><td>{{ '%.2f'|format(asset_total) }}</td>
+        <td><strong>Summe Passiva</strong></td><td>{{ '%.2f'|format(liability_total) }}</td></tr>
+    <tr><td colspan="2"></td><td><strong>Eigenkapital</strong></td><td>{{ '%.2f'|format(equity) }}</td></tr>
+  </tbody>
 </table>
 {% endblock %}
diff --git a/app/templates/base.html b/app/templates/base.html
index eb057ef..df1a0b4 100644
--- a/app/templates/base.html
+++ b/app/templates/base.html
@@ -2,18 +2,32 @@
 <html lang="de">
 <head>
     <meta charset="utf-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1">
     <title>Buchhaltung</title>
+    <link href="https://cdn.jsdelivr.net/npm/bootswatch@5.3.2/dist/flatly/bootstrap.min.css" rel="stylesheet">
 </head>
 <body>
-    <nav>
-        <a href="/">Home</a> |
-        <a href="/accounts">Konten</a> |
-        <a href="/entries">Buchungen</a> |
-        <a href="/profit_loss">G+V</a> |
-        <a href="/balance">Bilanz</a> |
-        <a href="/vat">UVA</a>
+    <nav class="navbar navbar-expand-lg navbar-dark bg-primary">
+        <div class="container-fluid">
+            <a class="navbar-brand" href="/">Buchhaltung</a>
+            <button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navbarNav" aria-controls="navbarNav" aria-expanded="false" aria-label="Toggle navigation">
+                <span class="navbar-toggler-icon"></span>
+            </button>
+            <div class="collapse navbar-collapse" id="navbarNav">
+                <ul class="navbar-nav me-auto mb-2 mb-lg-0">
+                    <li class="nav-item"><a class="nav-link" href="/accounts">Konten</a></li>
+                    <li class="nav-item"><a class="nav-link" href="/entries">Buchungen</a></li>
+                    <li class="nav-item"><a class="nav-link" href="/profit_loss">G+V</a></li>
+                    <li class="nav-item"><a class="nav-link" href="/balance">Bilanz</a></li>
+                    <li class="nav-item"><a class="nav-link" href="/vat">UVA</a></li>
+                    <li class="nav-item"><a class="nav-link" href="/vue_app">Vue&nbsp;Demo</a></li>
+                </ul>
+            </div>
+        </div>
     </nav>
-    <hr>
-    {% block content %}{% endblock %}
+    <div class="container mt-4">
+        {% block content %}{% endblock %}
+    </div>
+    <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0/dist/js/bootstrap.bundle.min.js"></script>
 </body>
 </html>
diff --git a/app/templates/entries.html b/app/templates/entries.html
index 061466a..a3a3922 100644
--- a/app/templates/entries.html
+++ b/app/templates/entries.html
@@ -1,25 +1,50 @@
 {% extends 'base.html' %}
 {% block content %}
-<h2>Buchungen</h2>
-<form method="post">
-    Soll: <select name="debit">
-        {% for acc in accounts %}
-            <option value="{{ acc.id }}">{{ acc.number }} {{ acc.name }}</option>
-        {% endfor %}
-    </select>
-    Haben: <select name="credit">
-        {% for acc in accounts %}
-            <option value="{{ acc.id }}">{{ acc.number }} {{ acc.name }}</option>
-        {% endfor %}
-    </select>
-    Betrag: <input type="number" step="0.01" name="amount">
-    Text: <input type="text" name="description">
-    <input type="submit" value="Buchen">
+<h2 class="mb-3">Buchungen</h2>
+<form method="post" class="row g-3 mb-4">
+    <div class="col-md-3">
+        <label class="form-label">Soll</label>
+        <select name="debit" class="form-select" required>
+            {% for acc in accounts %}
+                <option value="{{ acc.id }}">{{ acc.number }} {{ acc.name }}</option>
+            {% endfor %}
+        </select>
+    </div>
+    <div class="col-md-3">
+        <label class="form-label">Haben</label>
+        <select name="credit" class="form-select" required>
+            {% for acc in accounts %}
+                <option value="{{ acc.id }}">{{ acc.number }} {{ acc.name }}</option>
+            {% endfor %}
+        </select>
+    </div>
+    <div class="col-md-2">
+        <label class="form-label">Betrag</label>
+        <input type="number" step="0.01" name="amount" class="form-control" required>
+    </div>
+    <div class="col-md-3">
+        <label class="form-label">Text</label>
+        <input type="text" name="description" class="form-control">
+    </div>
+    <div class="col-md-1 d-flex align-items-end">
+        <button type="submit" class="btn btn-primary w-100">Buchen</button>
+    </div>
 </form>
-<table border="1">
-<tr><th>Datum</th><th>Text</th><th>Soll</th><th>Haben</th><th>Betrag</th></tr>
-{% for e in entries %}
-<tr><td>{{ e.entry_date }}</td><td>{{ e.description }}</td><td>{{ e.debit.number }}</td><td>{{ e.credit.number }}</td><td>{{ e.amount }}</td></tr>
-{% endfor %}
+
+<table class="table table-striped table-bordered">
+    <thead>
+        <tr><th>Datum</th><th>Text</th><th>Soll</th><th>Haben</th><th>Betrag</th></tr>
+    </thead>
+    <tbody>
+        {% for e in entries %}
+        <tr>
+            <td>{{ e.entry_date }}</td>
+            <td>{{ e.description }}</td>
+            <td>{{ e.debit.number }}</td>
+            <td>{{ e.credit.number }}</td>
+            <td>{{ '%.2f'|format(e.amount) }}</td>
+        </tr>
+        {% endfor %}
+    </tbody>
 </table>
 {% endblock %}
diff --git a/app/templates/index.html b/app/templates/index.html
index aa3a420..f53d8a8 100644
--- a/app/templates/index.html
+++ b/app/templates/index.html
@@ -1,4 +1,4 @@
 {% extends 'base.html' %}
 {% block content %}
-<h1>Willkommen zur Buchhaltung</h1>
+<h1 class="mb-4">Willkommen zur Buchhaltung</h1>
 {% endblock %}
diff --git a/app/templates/profit_loss.html b/app/templates/profit_loss.html
index bb2441f..30111a1 100644
--- a/app/templates/profit_loss.html
+++ b/app/templates/profit_loss.html
@@ -1,16 +1,20 @@
 {% extends 'base.html' %}
 {% block content %}
-<h2>Gewinn- und Verlustrechnung</h2>
-<table border="1">
-<tr><th>Konto</th><th>Betrag</th></tr>
-{% for name, amount in incomes %}
-<tr><td>{{ name }}</td><td>{{ '%.2f'|format(amount) }}</td></tr>
-{% endfor %}
-<tr><td><strong>Summe Erlöse</strong></td><td>{{ '%.2f'|format(income_total) }}</td></tr>
-{% for name, amount in expenses %}
-<tr><td>{{ name }}</td><td>{{ '%.2f'|format(amount) }}</td></tr>
-{% endfor %}
-<tr><td><strong>Summe Aufwendungen</strong></td><td>{{ '%.2f'|format(expense_total) }}</td></tr>
-<tr><td><strong>Gewinn/Verlust</strong></td><td>{{ '%.2f'|format(profit) }}</td></tr>
+<h2 class="mb-3">Gewinn- und Verlustrechnung</h2>
+<table class="table table-striped table-bordered">
+  <thead>
+    <tr><th>Konto</th><th>Betrag</th></tr>
+  </thead>
+  <tbody>
+    {% for name, amount in incomes %}
+    <tr><td>{{ name }}</td><td>{{ '%.2f'|format(amount) }}</td></tr>
+    {% endfor %}
+    <tr><td><strong>Summe Erlöse</strong></td><td>{{ '%.2f'|format(income_total) }}</td></tr>
+    {% for name, amount in expenses %}
+    <tr><td>{{ name }}</td><td>{{ '%.2f'|format(amount) }}</td></tr>
+    {% endfor %}
+    <tr><td><strong>Summe Aufwendungen</strong></td><td>{{ '%.2f'|format(expense_total) }}</td></tr>
+    <tr><td><strong>Gewinn/Verlust</strong></td><td>{{ '%.2f'|format(profit) }}</td></tr>
+  </tbody>
 </table>
 {% endblock %}
diff --git a/app/templates/vat.html b/app/templates/vat.html
index ac4d8a0..ab5273d 100644
--- a/app/templates/vat.html
+++ b/app/templates/vat.html
@@ -1,9 +1,11 @@
 {% extends 'base.html' %}
 {% block content %}
-<h2>Umsatzsteuervoranmeldung</h2>
-<table border="1">
-<tr><td>Umsatzsteuer</td><td>{{ '%.2f'|format(vat_income) }}</td></tr>
-<tr><td>Vorsteuer</td><td>{{ '%.2f'|format(vat_expense) }}</td></tr>
-<tr><td><strong>Zahllast</strong></td><td>{{ '%.2f'|format(vat_due) }}</td></tr>
+<h2 class="mb-3">Umsatzsteuervoranmeldung</h2>
+<table class="table table-striped table-bordered w-auto">
+  <tbody>
+    <tr><td>Umsatzsteuer</td><td>{{ '%.2f'|format(vat_income) }}</td></tr>
+    <tr><td>Vorsteuer</td><td>{{ '%.2f'|format(vat_expense) }}</td></tr>
+    <tr><td><strong>Zahllast</strong></td><td>{{ '%.2f'|format(vat_due) }}</td></tr>
+  </tbody>
 </table>
 {% endblock %}
diff --git a/app/templates/vue_app.html b/app/templates/vue_app.html
new file mode 100644
index 0000000..b341c4a
--- /dev/null
+++ b/app/templates/vue_app.html
@@ -0,0 +1,50 @@
+{% extends 'base.html' %}
+{% block content %}
+<div id="app" class="mt-4">
+  <h2 class="mb-3">Buchungen (Vue)</h2>
+  <form @submit.prevent="addEntry" class="row g-3">
+    <div class="col-md-3">
+      <label class="form-label">Soll</label>
+      <select v-model="newEntry.debit_id" class="form-select" required>
+        <option disabled value="">Bitte wählen</option>
+        <option v-for="acc in accounts" :value="acc.id">{{ acc.number }} {{ acc.name }}</option>
+      </select>
+    </div>
+    <div class="col-md-3">
+      <label class="form-label">Haben</label>
+      <select v-model="newEntry.credit_id" class="form-select" required>
+        <option disabled value="">Bitte wählen</option>
+        <option v-for="acc in accounts" :value="acc.id">{{ acc.number }} {{ acc.name }}</option>
+      </select>
+    </div>
+    <div class="col-md-2">
+      <label class="form-label">Betrag</label>
+      <input type="number" step="0.01" v-model="newEntry.amount" class="form-control" required>
+    </div>
+    <div class="col-md-3">
+      <label class="form-label">Text</label>
+      <input type="text" v-model="newEntry.description" class="form-control">
+    </div>
+    <div class="col-md-1 d-flex align-items-end">
+      <button type="submit" class="btn btn-primary">Buchen</button>
+    </div>
+  </form>
+  <table class="table table-striped table-bordered mt-4">
+    <thead>
+      <tr><th>Datum</th><th>Text</th><th>Soll</th><th>Haben</th><th>Betrag</th></tr>
+    </thead>
+    <tbody>
+      <tr v-for="e in entries" :key="e.id">
+        <td>{{ e.entry_date }}</td>
+        <td>{{ e.description }}</td>
+        <td>{{ e.debit.number }}</td>
+        <td>{{ e.credit.number }}</td>
+        <td>{{ e.amount.toFixed(2) }}</td>
+      </tr>
+    </tbody>
+  </table>
+</div>
+<script src="https://unpkg.com/vue@3/dist/vue.global.prod.js"></script>
+<script src="https://cdn.jsdelivr.net/npm/axios/dist/axios.min.js"></script>
+<script src="{{ url_for('static', filename='js/app.js') }}"></script>
+{% endblock %}