diff --git a/client/src/App.jsx b/client/src/App.jsx
index 68191ec..c03c54a 100644
--- a/client/src/App.jsx
+++ b/client/src/App.jsx
@@ -10,6 +10,7 @@ import Orders from './pages/Orders';
 import OrderNew from './pages/OrderNew';
 import OrderDetail from './pages/OrderDetail';
 import Restock from './pages/Restock';
+import Reports from './pages/Reports';
 
 function AuthGate({ children }) {
   const [state, setState] = useState({ checked: false, authenticated: false });
@@ -53,6 +54,7 @@ export default function App() {
             <Route path="/orders/new" element={<OrderNew />} />
             <Route path="/orders/:id" element={<OrderDetail />} />
             <Route path="/restock" element={<Restock />} />
+            <Route path="/reports" element={<Reports />} />
           </Routes>
           </Layout>
         )}
diff --git a/client/src/assets/gs-trefoil.svg b/client/src/assets/gs-trefoil.svg
new file mode 100644
index 0000000..8c135d4
--- /dev/null
+++ b/client/src/assets/gs-trefoil.svg
@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 13 11.7"><path d="M11.702 2.904c.005.118.009.247.009.39 0 .313-.072.496.426 1.143.112.146.213.303.022.415-.19.112-.31.188-.225.358.045.09.101.27-.381.438 0 0-.045.033.034.045.079.011.258 0 .258.179 0 .123-.336.146-.336.47 0 .427-.078.549-.448.572-.312.019-.771 0-.962 0-.37 0-.729.229-1.255.846-.224.261-1.857 2.308-2.478 3.92.069.007.139.011.207.011 1.166 0 2.461-1.069 2.999-2.167 1.21 0 3.552.084 3.552-3.535 0-1.574-.453-2.614-1.422-3.085z"/><path d="M8.032.789s-.197 2.402-2.223 4.284C3.783 6.956 3.191 8.032 2.42 9.484c0 0-2.42-.108-2.42-3.424S1.99 2.6 2.851 2.6c0 0 0-2.6 3.837-2.6 3.836 0 3.567 2.886 3.567 2.528 0 0-.144 1.201.502 1.757 0 0 .251.251-.054.376 0 0-.317.144-.197.395 0 0 .131.257-.376.389 0 0-.054.029.012.042.065.012.283.036.269.197-.006.066-.227.197-.227.197s-.125.089-.12.4c.006.311-.221.394-.382.4-.162.006-.998 0-1.129.006s-.611-.036-1.525 1.166-2.008 3.298-2.008 3.298-.753-.627-.95-.878-.162-.484.179-1.076C4.59 8.605 5.701 6.4 7.189 6.4c.842 0 1.219.089 1.272-.341 0 0 .018-.13.022-.233a.407.407 0 0 1 .202-.305c.15-.076.156-.192.071-.251-.083-.058-.204-.046-.235-.071-.018-.015-.01-.023.04-.045.026-.011.293-.072.355-.233.063-.161-.077-.233-.041-.332.035-.098.241-.224.304-.241.063-.018.099-.135.018-.26-.081-.126-.538-.628-.52-1.121.018-.493.027-1.613-.645-2.178z"/></svg>
diff --git a/client/src/components/Layout.jsx b/client/src/components/Layout.jsx
index 8d61d16..bc150fb 100644
--- a/client/src/components/Layout.jsx
+++ b/client/src/components/Layout.jsx
@@ -1,6 +1,7 @@
 import { useState } from 'react';
 import { Link, useLocation } from 'react-router-dom';
 import { api } from '../api';
+import trefoilLogo from '../assets/gs-trefoil.svg';
 
 const navItems = [
   { path: '/', label: 'Dashboard' },
@@ -8,6 +9,7 @@ const navItems = [
   { path: '/customers', label: 'Customers' },
   { path: '/orders', label: 'Orders' },
   { path: '/restock', label: 'Restock' },
+  { path: '/reports', label: 'Reports' },
 ];
 
 export default function Layout({ children, onLogout }) {
@@ -23,7 +25,7 @@ export default function Layout({ children, onLogout }) {
     <div className="layout">
       <header className="header">
         <div className="header-inner container">
-          <Link to="/" className="logo">Cookie Tracker</Link>
+          <Link to="/" className="logo"><img src={trefoilLogo} alt="Girl Scouts" style={{ height: '1.5em', verticalAlign: 'middle', marginRight: '0.4rem' }} />Cookie Tracker</Link>
           <button
             type="button"
             className="menu-toggle"
diff --git a/client/src/pages/OrderDetail.jsx b/client/src/pages/OrderDetail.jsx
index fb1644a..83f4c8f 100644
--- a/client/src/pages/OrderDetail.jsx
+++ b/client/src/pages/OrderDetail.jsx
@@ -11,6 +11,8 @@ export default function OrderDetail() {
   const [editing, setEditing] = useState(false);
   const [status, setStatus] = useState('pending');
   const [notes, setNotes] = useState('');
+  const [paymentMethod, setPaymentMethod] = useState('');
+  const [amountPaid, setAmountPaid] = useState('');
   const [items, setItems] = useState([]);
 
   function load() {
@@ -23,6 +25,8 @@ export default function OrderDetail() {
         setProducts(p);
         setStatus(o.status);
         setNotes(o.notes || '');
+        setPaymentMethod(o.payment_method || '');
+        setAmountPaid(o.amount_paid != null ? String(o.amount_paid) : '0');
         setItems(o.items?.map((i) => ({ product_id: i.product_id, quantity: i.quantity, price_at_sale: i.price_at_sale })) || []);
       })
       .catch((e) => setError(e.message))
@@ -37,6 +41,8 @@ export default function OrderDetail() {
     e.preventDefault();
     const payload = {
       status,
+      payment_method: paymentMethod || null,
+      amount_paid: amountPaid !== '' ? Number(amountPaid) : 0,
       notes: notes.trim() || null,
       items: items.map((line) => ({
         product_id: line.product_id,
@@ -99,6 +105,13 @@ export default function OrderDetail() {
           <p><strong>Status:</strong> {order.status}</p>
           <p><strong>Created:</strong> {new Date(order.created_at).toLocaleString()}</p>
           {order.notes && <p><strong>Notes:</strong> {order.notes}</p>}
+          <p><strong>Payment:</strong> {order.payment_method ? order.payment_method.charAt(0).toUpperCase() + order.payment_method.slice(1) : 'Not set'}</p>
+          <p><strong>Amount paid:</strong> ${Number(order.amount_paid || 0).toFixed(2)}</p>
+          {(() => {
+            const orderTotal = (order.items || []).reduce((s, i) => s + i.quantity * i.price_at_sale, 0);
+            const balance = orderTotal - (order.amount_paid || 0);
+            return balance > 0.005 ? <p style={{ color: 'var(--danger, #e53e3e)', fontWeight: 600 }}>Balance due: ${balance.toFixed(2)}</p> : null;
+          })()}
           <div className="table-wrap" style={{ marginTop: '1rem' }}>
             <table>
               <thead>
@@ -143,6 +156,33 @@ export default function OrderDetail() {
             <label>Notes</label>
             <textarea value={notes} onChange={(e) => setNotes(e.target.value)} rows={2} />
           </div>
+          <div className="form-row">
+            <div className="form-group">
+              <label>Payment method</label>
+              <select value={paymentMethod} onChange={(e) => {
+                setPaymentMethod(e.target.value);
+                if (e.target.value && amountPaid === '0') setAmountPaid(total.toFixed(2));
+              }}>
+                <option value="">None</option>
+                <option value="cash">Cash</option>
+                <option value="card">Card</option>
+                <option value="venmo">Venmo</option>
+                <option value="check">Check</option>
+                <option value="other">Other</option>
+              </select>
+            </div>
+            <div className="form-group">
+              <label>Amount paid</label>
+              <input
+                type="number"
+                step="0.01"
+                min="0"
+                value={amountPaid}
+                onChange={(e) => setAmountPaid(e.target.value)}
+                placeholder={total.toFixed(2)}
+              />
+            </div>
+          </div>
           <div className="form-group">
             <div style={{ display: 'flex', justifyContent: 'space-between', alignItems: 'center', marginBottom: '0.5rem' }}>
               <label style={{ marginBottom: 0 }}>Items</label>
diff --git a/client/src/pages/OrderNew.jsx b/client/src/pages/OrderNew.jsx
index 67fbf1d..ce888df 100644
--- a/client/src/pages/OrderNew.jsx
+++ b/client/src/pages/OrderNew.jsx
@@ -13,6 +13,8 @@ export default function OrderNew() {
   const [walkInName, setWalkInName] = useState('');
   const [items, setItems] = useState([]);
   const [status, setStatus] = useState('pending');
+  const [paymentMethod, setPaymentMethod] = useState('');
+  const [amountPaid, setAmountPaid] = useState('');
   const [notes, setNotes] = useState('');
   const [loading, setLoading] = useState(true);
   const [submitting, setSubmitting] = useState(false);
@@ -63,6 +65,8 @@ export default function OrderNew() {
       customer_id: customerId ? Number(customerId) : null,
       walk_in_name: !customerId && walkInName.trim() ? walkInName.trim() : undefined,
       status,
+      payment_method: paymentMethod || null,
+      amount_paid: amountPaid !== '' ? Number(amountPaid) : 0,
       notes: notes.trim() || null,
       items: items.map((line) => ({
         product_id: line.product_id,
@@ -130,6 +134,32 @@ export default function OrderNew() {
               <option value="delivered">Delivered</option>
             </select>
           </div>
+          <div className="form-group">
+            <label>Payment method</label>
+            <select value={paymentMethod} onChange={(e) => {
+              setPaymentMethod(e.target.value);
+              if (e.target.value && amountPaid === '') setAmountPaid(total.toFixed(2));
+            }}>
+              <option value="">None</option>
+              <option value="cash">Cash</option>
+              <option value="card">Card</option>
+              <option value="venmo">Venmo</option>
+              <option value="check">Check</option>
+              <option value="other">Other</option>
+            </select>
+          </div>
+        </div>
+        <div className="form-group">
+          <label>Amount paid</label>
+          <input
+            type="number"
+            step="0.01"
+            min="0"
+            value={amountPaid}
+            onChange={(e) => setAmountPaid(e.target.value)}
+            placeholder={total.toFixed(2)}
+            style={{ maxWidth: 200 }}
+          />
         </div>
         <div className="form-group">
           <label>Notes</label>
diff --git a/client/src/pages/Reports.jsx b/client/src/pages/Reports.jsx
new file mode 100644
index 0000000..87e5950
--- /dev/null
+++ b/client/src/pages/Reports.jsx
@@ -0,0 +1,288 @@
+import { useEffect, useState } from 'react';
+import { api } from '../api';
+
+function getWeekStart() {
+  const d = new Date();
+  d.setDate(d.getDate() - d.getDay());
+  return d.toISOString().slice(0, 10);
+}
+
+function getMonthStart() {
+  const d = new Date();
+  return `${d.getFullYear()}-${String(d.getMonth() + 1).padStart(2, '0')}-01`;
+}
+
+function getToday() {
+  return new Date().toISOString().slice(0, 10);
+}
+
+const statusColors = {
+  pending: '#ecc94b',
+  paid: '#48bb78',
+  delivered: '#4299e1',
+};
+
+export default function Reports() {
+  const [preset, setPreset] = useState('all');
+  const [startDate, setStartDate] = useState('');
+  const [endDate, setEndDate] = useState('');
+  const [data, setData] = useState(null);
+  const [loading, setLoading] = useState(true);
+  const [error, setError] = useState(null);
+
+  function getDates() {
+    switch (preset) {
+      case 'week': return { start: getWeekStart(), end: getToday() };
+      case 'month': return { start: getMonthStart(), end: getToday() };
+      case 'custom': return { start: startDate, end: endDate };
+      default: return {};
+    }
+  }
+
+  useEffect(() => {
+    setLoading(true);
+    const { start, end } = getDates();
+    const params = new URLSearchParams();
+    if (start) params.set('start', start);
+    if (end) params.set('end', end);
+    const qs = params.toString();
+    api(`/reports${qs ? '?' + qs : ''}`)
+      .then((r) => {
+        if (!r.ok) return r.json().then((e) => Promise.reject(new Error(e.error || 'Failed')));
+        return r.json();
+      })
+      .then(setData)
+      .catch((e) => setError(e.message))
+      .finally(() => setLoading(false));
+  }, [preset, startDate, endDate]);
+
+  return (
+    <>
+      <h1 className="page-title">Reports</h1>
+
+      <div className="card" style={{ marginBottom: '1.5rem' }}>
+        <div className="form-row" style={{ alignItems: 'flex-end', gap: '1rem' }}>
+          <div className="form-group" style={{ marginBottom: 0 }}>
+            <label>Date range</label>
+            <select value={preset} onChange={(e) => setPreset(e.target.value)}>
+              <option value="all">All time</option>
+              <option value="week">This week</option>
+              <option value="month">This month</option>
+              <option value="custom">Custom</option>
+            </select>
+          </div>
+          {preset === 'custom' && (
+            <>
+              <div className="form-group" style={{ marginBottom: 0 }}>
+                <label>Start</label>
+                <input type="date" value={startDate} onChange={(e) => setStartDate(e.target.value)} />
+              </div>
+              <div className="form-group" style={{ marginBottom: 0 }}>
+                <label>End</label>
+                <input type="date" value={endDate} onChange={(e) => setEndDate(e.target.value)} />
+              </div>
+            </>
+          )}
+        </div>
+      </div>
+
+      {error && <p className="error">{error}</p>}
+      {loading && <p className="text-muted">Loading reports...</p>}
+
+      {data && !loading && (
+        <>
+          {/* Sales by Product */}
+          <section className="card" style={{ marginBottom: '1.5rem' }}>
+            <h2 style={{ marginTop: 0 }}>Sales by Product</h2>
+            <div className="table-wrap">
+              <table>
+                <thead>
+                  <tr>
+                    <th>Product</th>
+                    <th>Units sold</th>
+                    <th>Revenue</th>
+                  </tr>
+                </thead>
+                <tbody>
+                  {data.salesByProduct.map((row) => (
+                    <tr key={row.product_name}>
+                      <td>{row.product_name}</td>
+                      <td>{row.units_sold}</td>
+                      <td>${Number(row.revenue).toFixed(2)}</td>
+                    </tr>
+                  ))}
+                </tbody>
+                <tfoot>
+                  <tr style={{ fontWeight: 600 }}>
+                    <td>Total</td>
+                    <td>{data.salesByProduct.reduce((s, r) => s + r.units_sold, 0)}</td>
+                    <td>${data.salesByProduct.reduce((s, r) => s + r.revenue, 0).toFixed(2)}</td>
+                  </tr>
+                </tfoot>
+              </table>
+            </div>
+          </section>
+
+          {/* Top Customers */}
+          <section className="card" style={{ marginBottom: '1.5rem' }}>
+            <h2 style={{ marginTop: 0 }}>Top Customers</h2>
+            <div className="table-wrap">
+              <table>
+                <thead>
+                  <tr>
+                    <th>Customer</th>
+                    <th>Orders</th>
+                    <th>Total spent</th>
+                  </tr>
+                </thead>
+                <tbody>
+                  {data.topCustomers.map((row) => (
+                    <tr key={row.customer_name}>
+                      <td>{row.customer_name}</td>
+                      <td>{row.order_count}</td>
+                      <td>${Number(row.total_spent).toFixed(2)}</td>
+                    </tr>
+                  ))}
+                  {data.topCustomers.length === 0 && (
+                    <tr><td colSpan={3} className="text-muted">No customer data</td></tr>
+                  )}
+                </tbody>
+              </table>
+            </div>
+          </section>
+
+          {/* Revenue Over Time */}
+          <section className="card" style={{ marginBottom: '1.5rem' }}>
+            <h2 style={{ marginTop: 0 }}>Revenue Over Time</h2>
+            <div className="table-wrap">
+              <table>
+                <thead>
+                  <tr>
+                    <th>Date</th>
+                    <th>Orders</th>
+                    <th>Revenue</th>
+                    <th style={{ width: '40%' }}></th>
+                  </tr>
+                </thead>
+                <tbody>
+                  {(() => {
+                    const maxRevenue = Math.max(...data.revenueOverTime.map((r) => r.revenue), 1);
+                    return data.revenueOverTime.map((row) => (
+                      <tr key={row.date}>
+                        <td>{row.date}</td>
+                        <td>{row.order_count}</td>
+                        <td>${Number(row.revenue).toFixed(2)}</td>
+                        <td>
+                          <div style={{
+                            height: 18,
+                            width: `${(row.revenue / maxRevenue) * 100}%`,
+                            backgroundColor: 'var(--accent, #4299e1)',
+                            borderRadius: 3,
+                            minWidth: row.revenue > 0 ? 4 : 0,
+                          }} />
+                        </td>
+                      </tr>
+                    ));
+                  })()}
+                  {data.revenueOverTime.length === 0 && (
+                    <tr><td colSpan={4} className="text-muted">No revenue data</td></tr>
+                  )}
+                </tbody>
+              </table>
+            </div>
+          </section>
+
+          {/* Order Status Breakdown */}
+          <section className="card" style={{ marginBottom: '1.5rem' }}>
+            <h2 style={{ marginTop: 0 }}>Order Status Breakdown</h2>
+            {(() => {
+              const totalOrders = data.orderStatusBreakdown.reduce((s, r) => s + r.count, 0);
+              return (
+                <>
+                  {totalOrders > 0 && (
+                    <div style={{ display: 'flex', borderRadius: 6, overflow: 'hidden', height: 28, marginBottom: '1rem' }}>
+                      {data.orderStatusBreakdown.map((row) => (
+                        <div
+                          key={row.status}
+                          style={{
+                            width: `${(row.count / totalOrders) * 100}%`,
+                            backgroundColor: statusColors[row.status] || '#a0aec0',
+                            display: 'flex',
+                            alignItems: 'center',
+                            justifyContent: 'center',
+                            fontSize: '0.75rem',
+                            fontWeight: 600,
+                            color: '#1a202c',
+                          }}
+                          title={`${row.status}: ${row.count}`}
+                        >
+                          {(row.count / totalOrders) >= 0.1 ? row.status : ''}
+                        </div>
+                      ))}
+                    </div>
+                  )}
+                  <div className="table-wrap">
+                    <table>
+                      <thead>
+                        <tr>
+                          <th>Status</th>
+                          <th>Count</th>
+                        </tr>
+                      </thead>
+                      <tbody>
+                        {data.orderStatusBreakdown.map((row) => (
+                          <tr key={row.status}>
+                            <td style={{ textTransform: 'capitalize' }}>{row.status}</td>
+                            <td>{row.count}</td>
+                          </tr>
+                        ))}
+                        {data.orderStatusBreakdown.length === 0 && (
+                          <tr><td colSpan={2} className="text-muted">No orders</td></tr>
+                        )}
+                      </tbody>
+                    </table>
+                  </div>
+                </>
+              );
+            })()}
+          </section>
+
+          {/* Inventory Summary */}
+          <section className="card" style={{ marginBottom: '1.5rem' }}>
+            <h2 style={{ marginTop: 0 }}>Inventory Summary</h2>
+            <div className="table-wrap">
+              <table>
+                <thead>
+                  <tr>
+                    <th>Product</th>
+                    <th>Current stock</th>
+                    <th>Total restocked</th>
+                    <th>Total sold</th>
+                    <th>Restock count</th>
+                  </tr>
+                </thead>
+                <tbody>
+                  {data.inventorySummary.map((row) => {
+                    const lowStock = row.low_stock_threshold > 0 && row.current_stock <= row.low_stock_threshold;
+                    return (
+                      <tr key={row.product_name} style={lowStock ? { backgroundColor: 'rgba(229, 62, 62, 0.1)' } : undefined}>
+                        <td>{row.product_name}</td>
+                        <td style={lowStock ? { color: 'var(--danger, #e53e3e)', fontWeight: 600 } : undefined}>
+                          {row.current_stock}
+                          {lowStock && ' (low)'}
+                        </td>
+                        <td>{row.total_restocked}</td>
+                        <td>{row.total_sold}</td>
+                        <td>{row.restock_count}</td>
+                      </tr>
+                    );
+                  })}
+                </tbody>
+              </table>
+            </div>
+          </section>
+        </>
+      )}
+    </>
+  );
+}
diff --git a/client/vite.config.js b/client/vite.config.js
index 66477e8..b7d47fd 100644
--- a/client/vite.config.js
+++ b/client/vite.config.js
@@ -4,6 +4,7 @@ import react from '@vitejs/plugin-react';
 export default defineConfig({
   plugins: [react()],
   server: {
+    host: true,
     port: 5173,
     proxy: {
       '/api': {
diff --git a/server/db.js b/server/db.js
index 5c470ac..4c3fe2a 100644
--- a/server/db.js
+++ b/server/db.js
@@ -57,7 +57,19 @@ function initSchema(database) {
       price_at_sale REAL NOT NULL,
       UNIQUE(order_id, product_id)
     );
+
+    CREATE TABLE IF NOT EXISTS stock_adjustments (
+      id INTEGER PRIMARY KEY AUTOINCREMENT,
+      product_id INTEGER NOT NULL REFERENCES products(id),
+      adjustment INTEGER NOT NULL,
+      reason TEXT NOT NULL,
+      reference_id INTEGER,
+      created_at TEXT DEFAULT (datetime('now'))
+    );
   `);
+
+  try { database.exec("ALTER TABLE orders ADD COLUMN payment_method TEXT"); } catch (e) {}
+  try { database.exec("ALTER TABLE orders ADD COLUMN amount_paid REAL NOT NULL DEFAULT 0"); } catch (e) {}
 }
 
 module.exports = { getDb, initSchema };
diff --git a/server/index.js b/server/index.js
index bd8d2a3..8749059 100644
--- a/server/index.js
+++ b/server/index.js
@@ -9,6 +9,7 @@ const productsRouter = require('./routes/products');
 const customersRouter = require('./routes/customers');
 const ordersRouter = require('./routes/orders');
 const dashboardRouter = require('./routes/dashboard');
+const reportsRouter = require('./routes/reports');
 
 const app = express();
 const PORT = process.env.PORT || 3002;
@@ -29,6 +30,7 @@ app.use('/api/products', productsRouter);
 app.use('/api/customers', customersRouter);
 app.use('/api/orders', ordersRouter);
 app.use('/api/dashboard', dashboardRouter);
+app.use('/api/reports', reportsRouter);
 
 if (process.env.NODE_ENV === 'production') {
   app.use(express.static(path.join(__dirname, '..', 'client', 'dist')));
diff --git a/server/routes/orders.js b/server/routes/orders.js
index 8ef1e41..448fa28 100644
--- a/server/routes/orders.js
+++ b/server/routes/orders.js
@@ -72,7 +72,11 @@ router.get('/:id', (req, res) => {
 router.post('/', (req, res) => {
   try {
     const db = getDb();
-    const { customer_id, walk_in_name, status = 'pending', notes, items = [] } = req.body;
+    const { customer_id, walk_in_name, status = 'pending', notes, items = [], payment_method, amount_paid } = req.body;
+    const validPaymentMethods = ['cash', 'card', 'venmo', 'check', 'other'];
+    if (payment_method && !validPaymentMethods.includes(payment_method)) {
+      return res.status(400).json({ error: `Invalid payment method. Must be one of: ${validPaymentMethods.join(', ')}` });
+    }
     if (!Array.isArray(items) || items.length === 0) {
       return res.status(400).json({ error: 'At least one order item is required' });
     }
@@ -90,13 +94,15 @@ router.post('/', (req, res) => {
         resolvedCustomerId = custResult.lastInsertRowid;
       }
       const result = db.prepare(
-        'INSERT INTO orders (customer_id, status, notes) VALUES (?, ?, ?)'
-      ).run(resolvedCustomerId, status, notes || null);
+        'INSERT INTO orders (customer_id, status, notes, payment_method, amount_paid) VALUES (?, ?, ?, ?, ?)'
+      ).run(resolvedCustomerId, status, notes || null, payment_method || null, Number(amount_paid) || 0);
       const orderId = result.lastInsertRowid;
 
       for (const it of items) {
         const qty = Number(it.quantity) || 0;
         atomicDeductStock(db, it.product_id, qty);
+        db.prepare('INSERT INTO stock_adjustments (product_id, adjustment, reason, reference_id) VALUES (?, ?, ?, ?)')
+          .run(it.product_id, -qty, 'order_created', orderId);
       }
 
       applyOrderItems(db, orderId, items);
@@ -120,7 +126,11 @@ router.put('/:id', (req, res) => {
     const db = getDb();
     const order = db.prepare('SELECT * FROM orders WHERE id = ?').get(req.params.id);
     if (!order) return res.status(404).json({ error: 'Order not found' });
-    const { customer_id, status, notes, items } = req.body;
+    const { customer_id, status, notes, items, payment_method, amount_paid } = req.body;
+    const validPaymentMethods = ['cash', 'card', 'venmo', 'check', 'other'];
+    if (payment_method && !validPaymentMethods.includes(payment_method)) {
+      return res.status(400).json({ error: `Invalid payment method. Must be one of: ${validPaymentMethods.join(', ')}` });
+    }
 
     const updateOrder = db.transaction(() => {
       if (items !== undefined) {
@@ -131,6 +141,8 @@ router.put('/:id', (req, res) => {
         for (const ei of existingItems) {
           db.prepare('UPDATE products SET quantity_on_hand = quantity_on_hand + ? WHERE id = ?')
             .run(ei.quantity, ei.product_id);
+          db.prepare('INSERT INTO stock_adjustments (product_id, adjustment, reason, reference_id) VALUES (?, ?, ?, ?)')
+            .run(ei.product_id, ei.quantity, 'order_updated', req.params.id);
         }
 
         // Deduct stock for new items atomically
@@ -138,6 +150,8 @@ router.put('/:id', (req, res) => {
           const qty = Number(it.quantity) || 0;
           if (qty <= 0) throw new Error('Quantity must be positive');
           atomicDeductStock(db, it.product_id, qty);
+          db.prepare('INSERT INTO stock_adjustments (product_id, adjustment, reason, reference_id) VALUES (?, ?, ?, ?)')
+            .run(it.product_id, -qty, 'order_updated', req.params.id);
         }
 
         applyOrderItems(db, req.params.id, items);
@@ -146,8 +160,10 @@ router.put('/:id', (req, res) => {
       const cid = customer_id !== undefined ? (customer_id || null) : order.customer_id;
       const st = status !== undefined ? status : order.status;
       const no = notes !== undefined ? notes : order.notes;
-      db.prepare('UPDATE orders SET customer_id = ?, status = ?, notes = ?, updated_at = datetime(\'now\') WHERE id = ?')
-        .run(cid, st, no, req.params.id);
+      const pm = payment_method !== undefined ? (payment_method || null) : order.payment_method;
+      const ap = amount_paid !== undefined ? Number(amount_paid) : order.amount_paid;
+      db.prepare('UPDATE orders SET customer_id = ?, status = ?, notes = ?, payment_method = ?, amount_paid = ?, updated_at = datetime(\'now\') WHERE id = ?')
+        .run(cid, st, no, pm, ap, req.params.id);
     });
 
     updateOrder();
@@ -172,6 +188,8 @@ router.delete('/:id', (req, res) => {
       for (const it of items) {
         db.prepare('UPDATE products SET quantity_on_hand = quantity_on_hand + ? WHERE id = ?')
           .run(it.quantity, it.product_id);
+        db.prepare('INSERT INTO stock_adjustments (product_id, adjustment, reason, reference_id) VALUES (?, ?, ?, ?)')
+          .run(it.product_id, it.quantity, 'order_deleted', req.params.id);
       }
       db.prepare('DELETE FROM order_items WHERE order_id = ?').run(req.params.id);
       db.prepare('DELETE FROM orders WHERE id = ?').run(req.params.id);
diff --git a/server/routes/products.js b/server/routes/products.js
index 66922f1..0cd3cf5 100644
--- a/server/routes/products.js
+++ b/server/routes/products.js
@@ -12,6 +12,29 @@ router.get('/', (req, res) => {
   }
 });
 
+router.get('/stock-history', (req, res) => {
+  try {
+    const db = getDb();
+    const { product_id, start, end, limit } = req.query;
+    let sql = `
+      SELECT sa.*, p.name as product_name
+      FROM stock_adjustments sa
+      JOIN products p ON p.id = sa.product_id
+      WHERE 1=1
+    `;
+    const params = [];
+    if (product_id) { sql += ' AND sa.product_id = ?'; params.push(product_id); }
+    if (start) { sql += ' AND sa.created_at >= ?'; params.push(start); }
+    if (end) { sql += ' AND sa.created_at <= ?'; params.push(end + ' 23:59:59'); }
+    sql += ' ORDER BY sa.created_at DESC';
+    if (limit) { sql += ' LIMIT ?'; params.push(Number(limit)); }
+    const rows = db.prepare(sql).all(...params);
+    res.json(rows);
+  } catch (err) {
+    res.status(500).json({ error: err.message });
+  }
+});
+
 router.get('/:id', (req, res) => {
   try {
     const db = getDb();
@@ -76,6 +99,7 @@ router.patch('/:id/stock', (req, res) => {
       return res.status(400).json({ error: 'Quantity would go negative' });
     }
     db.prepare('UPDATE products SET quantity_on_hand = ? WHERE id = ?').run(newQty, req.params.id);
+    db.prepare('INSERT INTO stock_adjustments (product_id, adjustment, reason) VALUES (?, ?, ?)').run(req.params.id, delta, 'restock');
     const updated = db.prepare('SELECT * FROM products WHERE id = ?').get(req.params.id);
     res.json(updated);
   } catch (err) {
diff --git a/server/routes/reports.js b/server/routes/reports.js
new file mode 100644
index 0000000..cc84c44
--- /dev/null
+++ b/server/routes/reports.js
@@ -0,0 +1,95 @@
+const express = require('express');
+const router = express.Router();
+const { getDb } = require('../db');
+
+router.get('/', (req, res) => {
+  try {
+    const db = getDb();
+    const { start, end } = req.query;
+
+    const endWithTime = end ? end + ' 23:59:59' : null;
+
+    // Build date filter fragments and positional params for order-based queries
+    let dateFilter = '';
+    const orderParams = [];
+    if (start) { dateFilter += ' AND o.created_at >= ?'; orderParams.push(start); }
+    if (end) { dateFilter += ' AND o.created_at <= ?'; orderParams.push(endWithTime); }
+
+    // For stock adjustments
+    let dateFilterSA = '';
+    const saParams = [];
+    if (start) { dateFilterSA += ' AND sa.created_at >= ?'; saParams.push(start); }
+    if (end) { dateFilterSA += ' AND sa.created_at <= ?'; saParams.push(endWithTime); }
+
+    // For inventory summary, the SA params repeat 3 times (3 subqueries)
+    const invParams = [...saParams, ...saParams, ...saParams];
+
+    const salesByProduct = db.prepare(`
+      SELECT p.name as product_name,
+             COALESCE(SUM(oi.quantity), 0) as units_sold,
+             COALESCE(SUM(oi.quantity * oi.price_at_sale), 0) as revenue
+      FROM products p
+      LEFT JOIN (
+        SELECT oi.product_id, oi.quantity, oi.price_at_sale
+        FROM order_items oi
+        JOIN orders o ON o.id = oi.order_id
+        WHERE 1=1 ${dateFilter}
+      ) oi ON oi.product_id = p.id
+      GROUP BY p.id, p.name
+      ORDER BY revenue DESC
+    `).all(...orderParams);
+
+    const topCustomers = db.prepare(`
+      SELECT c.name as customer_name,
+             COUNT(DISTINCT o.id) as order_count,
+             COALESCE(SUM(oi.quantity * oi.price_at_sale), 0) as total_spent
+      FROM customers c
+      JOIN orders o ON o.customer_id = c.id ${dateFilter ? 'AND 1=1' + dateFilter : ''}
+      JOIN order_items oi ON oi.order_id = o.id
+      GROUP BY c.id, c.name
+      ORDER BY total_spent DESC
+    `).all(...orderParams);
+
+    const revenueOverTime = db.prepare(`
+      SELECT date(o.created_at) as date,
+             COALESCE(SUM(oi.quantity * oi.price_at_sale), 0) as revenue,
+             COUNT(DISTINCT o.id) as order_count
+      FROM orders o
+      JOIN order_items oi ON oi.order_id = o.id
+      WHERE 1=1 ${dateFilter}
+      GROUP BY date(o.created_at)
+      ORDER BY date
+    `).all(...orderParams);
+
+    const orderStatusBreakdown = db.prepare(`
+      SELECT o.status, COUNT(*) as count
+      FROM orders o
+      WHERE 1=1 ${dateFilter}
+      GROUP BY o.status
+      ORDER BY count DESC
+    `).all(...orderParams);
+
+    const inventorySummary = db.prepare(`
+      SELECT p.name as product_name,
+             p.quantity_on_hand as current_stock,
+             p.low_stock_threshold,
+             COALESCE((SELECT SUM(sa.adjustment) FROM stock_adjustments sa WHERE sa.product_id = p.id AND sa.reason = 'restock' ${dateFilterSA}), 0) as total_restocked,
+             COALESCE((SELECT ABS(SUM(sa.adjustment)) FROM stock_adjustments sa WHERE sa.product_id = p.id AND sa.adjustment < 0 ${dateFilterSA}), 0) as total_sold,
+             COALESCE((SELECT COUNT(*) FROM stock_adjustments sa WHERE sa.product_id = p.id AND sa.reason = 'restock' ${dateFilterSA}), 0) as restock_count
+      FROM products p
+      ORDER BY p.name
+    `).all(...invParams);
+
+    res.json({
+      salesByProduct,
+      topCustomers,
+      revenueOverTime,
+      orderStatusBreakdown,
+      inventorySummary,
+    });
+  } catch (err) {
+    res.status(500).json({ error: err.message });
+  }
+});
+
+module.exports = router;