diff --git a/app.css b/app.css
index fb732e1..2579ad6 100644
--- a/app.css
+++ b/app.css
@@ -439,6 +439,38 @@ body {
 
 .btn[disabled] { opacity: 0.5; cursor: not-allowed; }
 
+/* Mini-Cards für Kundendetail (Aufträge/Rechnungen/Berichte) */
+.mini-card {
+    background: #2a2a30;
+    border-radius: 6px;
+    padding: 10px 12px;
+    margin-bottom: 6px;
+    cursor: pointer;
+    transition: background 0.15s;
+}
+.mini-card:active { background: #35353b; }
+.mini-card .mini-ref {
+    font-weight: 600;
+    color: #7aa2f7;
+    font-size: 13px;
+}
+.mini-card .mini-meta {
+    font-size: 12px;
+    opacity: 0.7;
+    margin-top: 3px;
+}
+
+.customer-actions {
+    display: flex;
+    gap: 8px;
+    margin-top: 12px;
+}
+.customer-actions a {
+    text-decoration: none;
+    text-align: center;
+    flex: 1;
+}
+
 /* Report-Page-Thumb mit Nummer */
 .report-page-thumb { position: relative; }
 .report-page-thumb .page-num {
@@ -453,6 +485,36 @@ body {
 }
 
 /* Unterschrift-Modal */
+.signature-modal .signature-meta {
+    padding: 12px 16px;
+    background: #1a1a1f;
+    border-bottom: 1px solid #333;
+    display: flex;
+    flex-direction: column;
+    gap: 8px;
+}
+.signature-modal .signature-meta input[type="text"] {
+    width: 100%;
+    padding: 12px 14px;
+    background: #2a2a30;
+    color: #fff;
+    border: 1px solid #444;
+    border-radius: 6px;
+    font-size: 15px;
+    box-sizing: border-box;
+}
+.signature-modal .sig-gps-label {
+    color: #e0e0e0;
+    font-size: 13px;
+    display: flex;
+    align-items: center;
+    gap: 8px;
+}
+.signature-modal .sig-legal {
+    color: #999;
+    font-size: 11px;
+    line-height: 1.4;
+}
 .signature-modal .signature-toolbar {
     display: flex;
     align-items: center;
diff --git a/app.js b/app.js
index 5914ade..6fb676c 100644
--- a/app.js
+++ b/app.js
@@ -307,6 +307,135 @@ async function loadThumbs() {
     }
 }
 
+router.on('/customers', async () => {
+    if (!(await ensureAuth())) return;
+    title('Kunden');
+    setNav(true, 'customers');
+    setBack(false);
+    showLoader('Lade Kunden…');
+
+    try {
+        const data = await api.listCustomers();
+        if (!data.customers.length) {
+            main().innerHTML = '<div class="empty-state"><div class="icon">👥</div>Keine Kunden</div>';
+            return;
+        }
+        main().innerHTML = `
+            <div class="search-bar"><input type="search" id="cust-search" placeholder="🔍 Kunde suchen…"></div>
+            <div id="cust-list">${renderCustomerList(data.customers)}</div>
+        `;
+        bindCustomerCards();
+        document.getElementById('cust-search').addEventListener('input', async (e) => {
+            const d = await api.listCustomers({ q: e.target.value });
+            document.getElementById('cust-list').innerHTML = renderCustomerList(d.customers);
+            bindCustomerCards();
+        });
+    } catch (e) {
+        main().innerHTML = '<div class="empty-state"><div class="icon">⚠️</div>' + e.message + '</div>';
+    }
+});
+
+function renderCustomerList(list) {
+    return list.map(c => `
+        <div class="order-card customer-card" data-id="${c.id}">
+            <div class="ref">${escapeHtml(c.name || '')}</div>
+            <div class="name">${escapeHtml((c.zip || '') + ' ' + (c.town || '')).trim() || '—'}</div>
+            <div class="meta">
+                <span>${c.phone ? '📞 ' + escapeHtml(c.phone) : ''}</span>
+                ${c.bericht_count > 0 ? `<span class="badge">📑 ${c.bericht_count}</span>` : ''}
+            </div>
+        </div>
+    `).join('');
+}
+
+function bindCustomerCards() {
+    document.querySelectorAll('.customer-card').forEach(c => {
+        c.addEventListener('click', () => router.go('#/customers/' + c.dataset.id));
+    });
+}
+
+router.on('/customers/:id', async (args) => {
+    if (!(await ensureAuth())) return;
+    setNav(true, 'customers');
+    setBack(true, '#/customers');
+    showLoader('Lade Kunde…');
+
+    try {
+        const data = await api.getCustomer(args.id);
+        title(data.customer.name);
+
+        const addr = [data.customer.address, (data.customer.zip || '') + ' ' + (data.customer.town || '')]
+            .map(s => (s || '').trim()).filter(Boolean).join('\n');
+
+        main().innerHTML = `
+            <div class="detail-section">
+                <h3>Stammdaten</h3>
+                <p><strong>${escapeHtml(data.customer.name)}</strong></p>
+                ${data.customer.code ? `<p class="label">Kundennr: ${escapeHtml(data.customer.code)}</p>` : ''}
+                ${addr ? `<p>${escapeHtml(addr).replace(/\n/g, '<br>')}</p>` : ''}
+                ${data.customer.phone ? `<p><a href="tel:${escapeHtml(data.customer.phone)}">📞 ${escapeHtml(data.customer.phone)}</a></p>` : ''}
+                ${data.customer.email ? `<p><a href="mailto:${escapeHtml(data.customer.email)}">✉ ${escapeHtml(data.customer.email)}</a></p>` : ''}
+                ${data.customer.siret || data.customer.vat ? `<p class="label">USt-ID: ${escapeHtml(data.customer.vat || '')}</p>` : ''}
+                <div class="customer-actions">
+                    ${data.customer.address || data.customer.town ? `<a class="btn btn-secondary" href="https://www.google.com/maps/search/?api=1&query=${encodeURIComponent(data.customer.name + ' ' + (data.customer.address||'') + ' ' + (data.customer.zip||'') + ' ' + (data.customer.town||''))}" target="_blank">🗺 Route</a>` : ''}
+                </div>
+            </div>
+
+            ${data.orders.length ? `
+            <div class="detail-section">
+                <h3>Aufträge (${data.orders.length})</h3>
+                ${data.orders.map(o => `
+                    <div class="mini-card" data-order-id="${o.id}">
+                        <div class="mini-ref">${escapeHtml(o.ref)}</div>
+                        <div class="mini-meta">${formatDate(o.date)} · ${formatEur(o.total)}${o.bericht_count > 0 ? ' · 📑 ' + o.bericht_count : ''}</div>
+                    </div>
+                `).join('')}
+            </div>` : ''}
+
+            ${data.reports.length ? `
+            <div class="detail-section">
+                <h3>Berichte (${data.reports.length})</h3>
+                ${data.reports.map(r => `
+                    <div class="mini-card" data-report-id="${r.id}">
+                        <div class="mini-ref">${escapeHtml(r.ref)} <span class="${r.status === 1 ? 'status-final' : 'status-draft'}">${r.status === 1 ? 'Final' : 'Entwurf'}</span></div>
+                        <div class="mini-meta">${escapeHtml(r.titel || '')} · ${formatDate(r.datec)}</div>
+                    </div>
+                `).join('')}
+            </div>` : ''}
+
+            ${data.invoices.length ? `
+            <div class="detail-section">
+                <h3>Rechnungen (${data.invoices.length})</h3>
+                ${data.invoices.map(i => `
+                    <div class="mini-card">
+                        <div class="mini-ref">${escapeHtml(i.ref)}</div>
+                        <div class="mini-meta">${formatDate(i.date)} · ${formatEur(i.total)}</div>
+                    </div>
+                `).join('')}
+            </div>` : ''}
+        `;
+
+        document.querySelectorAll('.mini-card[data-order-id]').forEach(el => {
+            el.addEventListener('click', () => router.go('#/orders/' + el.dataset.orderId));
+        });
+        document.querySelectorAll('.mini-card[data-report-id]').forEach(el => {
+            el.addEventListener('click', () => router.go('#/reports/' + el.dataset.reportId));
+        });
+    } catch (e) {
+        main().innerHTML = '<div class="empty-state"><div class="icon">⚠️</div>' + e.message + '</div>';
+    }
+});
+
+function formatDate(unix) {
+    if (!unix) return '—';
+    const d = new Date(unix * 1000);
+    return d.toLocaleDateString('de-DE', { year: 'numeric', month: '2-digit', day: '2-digit' });
+}
+function formatEur(v) {
+    if (v == null) return '';
+    return new Intl.NumberFormat('de-DE', { style: 'currency', currency: 'EUR' }).format(v);
+}
+
 router.on('/reports', async () => {
     if (!(await ensureAuth())) return;
     title('Berichte');
@@ -538,6 +667,14 @@ function openSignatureModal(berichtId) {
             <div class="fs-title">✍️ Kunden-Unterschrift</div>
             <button class="icon-btn" id="sig-save" title="Speichern">✓</button>
         </div>
+        <div class="signature-meta">
+            <input type="text" id="sig-name" placeholder="Name des Unterzeichners (Pflicht)" autocomplete="name">
+            <label class="sig-gps-label">
+                <input type="checkbox" id="sig-gps" checked>
+                📍 GPS-Position aufnehmen
+            </label>
+            <div class="sig-legal">Mit der Unterschrift bestätige ich die ordnungsgemäße Ausführung der dokumentierten Arbeiten. Server-Zeitstempel, GPS-Koordinaten und ein SHA-256-Integritäts-Hash werden zusammen mit der Unterschrift gespeichert.</div>
+        </div>
         <div class="signature-toolbar">
             <button id="sig-clear">🗑 Leeren</button>
             <span class="sig-hint">Mit dem Finger unterschreiben</span>
@@ -592,11 +729,32 @@ function openSignatureModal(berichtId) {
         window.removeEventListener('resize', fitCanvas);
         modal.remove();
     };
-    modal.querySelector('#sig-save').onclick = () => {
+    modal.querySelector('#sig-save').onclick = async () => {
+        const signer = modal.querySelector('#sig-name').value.trim();
+        if (!signer) {
+            showToast('Bitte Namen des Unterzeichners eingeben', 'error');
+            modal.querySelector('#sig-name').focus();
+            return;
+        }
+        // GPS holen wenn aktiviert
+        let gps = null;
+        if (modal.querySelector('#sig-gps').checked && 'geolocation' in navigator) {
+            showToast('Hole GPS-Position…');
+            try {
+                const pos = await new Promise((res, rej) => {
+                    navigator.geolocation.getCurrentPosition(res, rej, { timeout: 8000, enableHighAccuracy: true });
+                });
+                gps = { lat: pos.coords.latitude, lon: pos.coords.longitude };
+            } catch (e) {
+                console.warn('GPS failed', e);
+            }
+        }
         showToast('Speichere Unterschrift…');
         canvas.toBlob(async (blob) => {
             try {
-                await api.uploadSignature(berichtId, blob);
+                const opts = { signer_name: signer };
+                if (gps) { opts.gps_lat = gps.lat; opts.gps_lon = gps.lon; }
+                await api.uploadSignature(berichtId, blob, opts);
                 showToast('✓ Unterschrift hinzugefügt');
                 modal.remove();
                 router.navigate();
diff --git a/index.php b/index.php
index d8208eb..81c28dd 100644
--- a/index.php
+++ b/index.php
@@ -51,6 +51,7 @@ header('Expires: 0');
 
     <nav id="bottom-nav" style="display:none">
         <button data-route="orders" class="active">📋 Aufträge</button>
+        <button data-route="customers">👥 Kunden</button>
         <button data-route="reports">📑 Berichte</button>
         <button data-route="settings">⚙️</button>
     </nav>
diff --git a/lib/api.js b/lib/api.js
index 8c24fe1..a746a5a 100644
--- a/lib/api.js
+++ b/lib/api.js
@@ -55,6 +55,17 @@
         await clearToken();
     }
 
+    async function listCustomers(opts = {}) {
+        const params = new URLSearchParams();
+        if (opts.q) params.set('q', opts.q);
+        const qs = params.toString();
+        return request('/customers.php' + (qs ? '?' + qs : ''));
+    }
+
+    async function getCustomer(id) {
+        return request('/customers.php?id=' + id);
+    }
+
     async function listOrders(opts = {}) {
         const params = new URLSearchParams();
         if (opts.q) params.set('q', opts.q);
@@ -121,9 +132,12 @@
         });
     }
 
-    async function uploadSignature(berichtId, pngBlob) {
+    async function uploadSignature(berichtId, pngBlob, opts) {
         const fd = new FormData();
         fd.append('file', pngBlob, 'signature.png');
+        if (opts && opts.signer_name) fd.append('signer_name', opts.signer_name);
+        if (opts && opts.gps_lat != null) fd.append('gps_lat', opts.gps_lat);
+        if (opts && opts.gps_lon != null) fd.append('gps_lon', opts.gps_lon);
         return request('/pages.php?action=signature&bericht_id=' + berichtId, {
             method: 'POST',
             body: fd,
@@ -182,6 +196,7 @@
         getToken, setToken, clearToken,
         login, logout,
         listOrders, getOrder, listOrderPhotos, uploadOrderPhoto,
+        listCustomers, getCustomer,
         getReport, listReports, finalizeReport,
         deletePhoto, uploadVoiceNote, uploadAnnotatedPhoto,
         getPhotoBlobUrl, clearPhotoCache,