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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>ThutoAI - Student Login</title>
    <style>
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background: linear-gradient(135deg, #1877f2 0%, #42a5f5 100%);
            height: 100vh;
            display: flex;
            justify-content: center;
            align-items: center;
        }

        .login-container {
            background: white;
            padding: 40px;
            border-radius: 15px;
            box-shadow: 0 8px 32px rgba(24, 119, 242, 0.3);
            width: 90%;
            max-width: 400px;
            text-align: center;
        }

        .logo {
            font-size: 32px;
            font-weight: bold;
            color: #1877f2;
            margin-bottom: 10px;
        }

        .subtitle {
            color: #65676b;
            margin-bottom: 30px;
        }

        .form-group {
            margin-bottom: 20px;
            text-align: left;
        }

        .form-group label {
            display: block;
            margin-bottom: 5px;
            color: #1c1e21;
            font-weight: 500;
        }

        .form-group input {
            width: 100%;
            padding: 14px 16px;
            border: 1px solid #dddfe2;
            border-radius: 6px;
            font-size: 16px;
            transition: border-color 0.3s;
            background: #f5f6f7;
        }

        .form-group input:focus {
            outline: none;
            border-color: #1877f2;
            background: white;
        }

        .login-btn {
            width: 100%;
            padding: 12px;
            background: #1877f2;
            color: white;
            border: none;
            border-radius: 6px;
            font-size: 16px;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.3s;
        }

        .login-btn:hover {
            background: #166fe5;
        }

        .login-btn:disabled {
            opacity: 0.7;
            cursor: not-allowed;
        }

        .error-message {
            color: #e41e3f;
            margin-top: 15px;
            padding: 10px;
            background: #ffebee;
            border-radius: 5px;
            display: none;
        }

        .demo-info {
            margin-top: 30px;
            padding: 20px;
            background: #e7f3ff;
            border-radius: 8px;
            border-left: 4px solid #1877f2;
        }

        .demo-info h4 {
            color: #1877f2;
            margin-bottom: 10px;
        }

        .demo-info p {
            color: #65676b;
            font-size: 14px;
            margin-bottom: 5px;
        }
    </style>
</head>
<body>
    <div class="login-container">
        <div class="logo">ThutoAI</div>
        <div class="subtitle">Your AI-Powered Student Portal</div>
        
        <form id="loginForm">
            <div class="form-group">
                <label for="username">Student ID</label>
                <input type="text" id="username" name="username" required>
            </div>
            
            <div class="form-group">
                <label for="password">Password</label>
                <input type="password" id="password" name="password" required>
            </div>
            
            <button type="submit" class="login-btn" id="loginBtn">
                Sign In
            </button>
            
            <div class="error-message" id="errorMessage"></div>
        </form>
        
        <div class="demo-info">
            <h4>Demo Credentials</h4>
            <p><strong>Username:</strong> student123</p>
            <p><strong>Password:</strong> password123</p>
            <p><em>Use these credentials to explore ThutoAI</em></p>
        </div>
    </div>

    <script>
        document.getElementById('loginForm').addEventListener('submit', async (e) => {
            e.preventDefault();
            
            const username = document.getElementById('username').value;
            const password = document.getElementById('password').value;
            const loginBtn = document.getElementById('loginBtn');
            const errorMessage = document.getElementById('errorMessage');
            
            loginBtn.disabled = true;
            loginBtn.textContent = 'Signing In...';
            errorMessage.style.display = 'none';
            
            try {
                const response = await fetch('/login', {
                    method: 'POST',
                    headers: {
                        'Content-Type': 'application/json',
                    },
                    body: JSON.stringify({ username, password })
                });
                
                const data = await response.json();
                
                if (data.success) {
                    window.location.href = data.redirect;
                } else {
                    errorMessage.textContent = data.message;
                    errorMessage.style.display = 'block';
                }
            } catch (error) {
                errorMessage.textContent = 'Login failed. Please try again.';
                errorMessage.style.display = 'block';
            } finally {
                loginBtn.disabled = false;
                loginBtn.textContent = 'Sign In';
            }
        });
    </script>
</body>
</html>