body {
            font-family: Arial, sans-serif;
            background-color: white;
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0;
            padding: 20px;
        }
        
        .login-container {
            background-color: white;
            padding: 40px;
            border-radius: 15px;
            box-shadow: 0 15px 35px rgba(0,0,0,0.1);
            width: 100%;
            max-width: 400px;
        }
        
        .logo {
            text-align: center;
            margin-bottom: 30px;
        }
        
        .logo h1 {
            color: #2c3e50;
            margin: 10px 0;
            font-size: 28px;
        }
        
        .logo p {
            color: #7f8c8d;
            margin: 0;
            font-size: 14px;
        }
        
        .form-group {
            margin-bottom: 20px;
        }
        
        label {
            display: block;
            margin-bottom: 8px;
            font-weight: bold;
            color: #34495e;
        }
        
        input[type="text"], input[type="password"] {
            width: 100%;
            padding: 15px;
            border: 2px solid #ddd;
            border-radius: 8px;
            font-size: 16px;
            box-sizing: border-box;
            transition: border-color 0.3s;
        }
        
        input[type="text"]:focus, input[type="password"]:focus {
            outline: none;
            border-color: #3498db;
        }
        
        .login-btn {
            width: 100%;
            background-color: #27ae60;
            color: white;
            padding: 15px;
            border: none;
            border-radius: 8px;
            font-size: 18px;
            font-weight: bold;
            cursor: pointer;
            transition: background-color 0.3s;
        }
        
        .login-btn:hover {
            background-color: #219a52;
        }
        
        .error {
            background-color: #f8d7da;
            color: #721c24;
            padding: 15px;
            border-radius: 8px;
            margin-bottom: 20px;
            border: 1px solid #f5c6cb;
            text-align: center;
        }
        
        .demo-info {
            background-color: #d1ecf1;
            color: #0c5460;
            padding: 15px;
            border-radius: 8px;
            margin-top: 20px;
            font-size: 14px;
            text-align: center;
        }
        
        .demo-info strong {
            display: block;
            margin-bottom: 10px;
        }
        
        .demo-users {
            text-align: left;
            margin-top: 10px;
        }
        
        @media (max-width: 480px) {
            .login-container {
                padding: 30px 20px;
            }
        }