3 files changed, 193 insertions, 0 deletions
diff --git a/frontend/src/components/Login.css b/frontend/src/components/Login.css
new file mode 100644
index 0000000..f1ca976
--- /dev/null
+++ b/frontend/src/components/Login.css
@@ -0,0 +1,63 @@
+.login-container {
+  display: flex;
+  justify-content: center;
+  align-items: center;
+  height: 100vh;
+  background-color: #f5f5f5;
+}
+
+.login-form {
+  background: white;
+  padding: 2rem;
+  border-radius: 8px;
+  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
+  width: 100%;
+  max-width: 400px;
+}
+
+.login-form h1 {
+  margin-bottom: 2rem;
+  text-align: center;
+  color: #333;
+}
+
+.form-group {
+  margin-bottom: 1.5rem;
+}
+
+.form-group label {
+  display: block;
+  margin-bottom: 0.5rem;
+  font-weight: bold;
+  color: #555;
+}
+
+.form-group input {
+  width: 100%;
+  padding: 0.75rem;
+  border: 1px solid #ddd;
+  border-radius: 4px;
+  font-size: 1rem;
+}
+
+.error-message {
+  color: #dc3545;
+  margin-bottom: 1rem;
+  text-align: center;
+}
+
+button[type="submit"] {
+  width: 100%;
+  padding: 0.75rem;
+  background-color: #007bff;
+  color: white;
+  border: none;
+  border-radius: 4px;
+  font-size: 1rem;
+  cursor: pointer;
+  transition: background-color 0.2s;
+}
+
+button[type="submit"]:hover {
+  background-color: #0056b3;
+}
diff --git a/frontend/src/components/Login.test.tsx b/frontend/src/components/Login.test.tsx
new file mode 100644
index 0000000..44d1371
--- /dev/null
+++ b/frontend/src/components/Login.test.tsx
@@ -0,0 +1,76 @@
+import { render, screen, fireEvent, waitFor } from '@testing-library/react';
+import { BrowserRouter } from 'react-router-dom';
+import { describe, it, expect, vi, beforeEach } from 'vitest';
+import Login from './Login';
+
+// Mock fetch
+global.fetch = vi.fn();
+
+const renderLogin = () => {
+    render(
+        <BrowserRouter>
+            <Login />
+        </BrowserRouter>
+    );
+};
+
+describe('Login Component', () => {
+    beforeEach(() => {
+        vi.resetAllMocks();
+    });
+
+    it('renders login form', () => {
+        renderLogin();
+        expect(screen.getByLabelText(/password/i)).toBeInTheDocument();
+        expect(screen.getByRole('button', { name: /login/i })).toBeInTheDocument();
+    });
+
+    it('handles successful login', async () => {
+        (global.fetch as any).mockResolvedValueOnce({
+            ok: true,
+        });
+
+        renderLogin();
+
+        fireEvent.change(screen.getByLabelText(/password/i), { target: { value: 'secret' } });
+        fireEvent.click(screen.getByRole('button', { name: /login/i }));
+
+        await waitFor(() => {
+            expect(global.fetch).toHaveBeenCalledWith('/api/login', expect.objectContaining({
+                method: 'POST',
+            }));
+        });
+        // Navigation assertion is tricky without mocking useNavigate, 
+        // but if no error is shown, we assume success path was taken
+        expect(screen.queryByText(/login failed/i)).not.toBeInTheDocument();
+    });
+
+    it('handles failed login', async () => {
+        (global.fetch as any).mockResolvedValueOnce({
+            ok: false,
+            json: async () => ({ message: 'Bad credentials' }),
+        });
+
+        renderLogin();
+
+        fireEvent.change(screen.getByLabelText(/password/i), { target: { value: 'wrong' } });
+        fireEvent.click(screen.getByRole('button', { name: /login/i }));
+
+        await waitFor(() => {
+            expect(screen.getByText(/bad credentials/i)).toBeInTheDocument();
+        });
+    });
+
+    it('handles network error', async () => {
+        (global.fetch as any).mockRejectedValueOnce(new Error('Network error'));
+
+        renderLogin();
+
+        fireEvent.change(screen.getByLabelText(/password/i), { target: { value: 'secret' } });
+        fireEvent.click(screen.getByRole('button', { name: /login/i }));
+
+        await waitFor(() => {
+            expect(screen.getByText(/network error/i)).toBeInTheDocument();
+        });
+    });
+});
diff --git a/frontend/src/components/Login.tsx b/frontend/src/components/Login.tsx
new file mode 100644
index 0000000..2e8bbf7
--- /dev/null
+++ b/frontend/src/components/Login.tsx
@@ -0,0 +1,54 @@
+import { useState, type FormEvent } from 'react';
+import { useNavigate } from 'react-router-dom';
+import './Login.css';
+
+export default function Login() {
+    const [password, setPassword] = useState('');
+    const [error, setError] = useState('');
+    const navigate = useNavigate();
+
+    const handleSubmit = async (e: FormEvent) => {
+        e.preventDefault();
+        setError('');
+
+        try {
+            // Use URLSearchParams to send as form-urlencoded, matching backend expectation
+            const params = new URLSearchParams();
+            params.append('password', password);
+
+            const res = await fetch('/api/login', {
+                method: 'POST',
+                body: params,
+            });
+
+            if (res.ok) {
+                navigate('/');
+            } else {
+                const data = await res.json();
+                setError(data.message || 'Login failed');
+            }
+        } catch (err) {
+            setError('Network error');
+        }
+    };
+
+    return (
+        <div className="login-container">
+            <form onSubmit={handleSubmit} className="login-form">
+                <h1>neko rss mode</h1>
+                <div className="form-group">
+                    <label htmlFor="password">password</label>
+                    <input
+                        id="password"
+                        type="password"
+                        value={password}
+                        onChange={(e) => setPassword(e.target.value)}
+                        autoFocus
+                    />
+                </div>
+                {error && <div className="error-message">{error}</div>}
+                <button type="submit">login</button>
+            </form>
+        </div>
+    );
+}