body {
            font-family: Arial, sans-serif;
            background: #f4f6f9;
            display: flex;
            justify-content: center;
            align-items: center;
            height: 100vh;
        }
        .container {
            background: #fff;
            padding: 25px;
            border-radius: 10px;
            box-shadow: 0 4px 8px rgba(0,0,0,0.1);
            width: 400px;
        }
        h2 {
            text-align: center;
            margin-bottom: 20px;
            color: #333;
        }
        label {
            font-weight: bold;
            display: block;
            margin-top: 10px;
        }
        input, select, button {
            width: 100%;
            padding: 10px;
            margin-top: 5px;
            border: 1px solid #ccc;
            border-radius: 6px;
        }
        button {
            background: #007bff;
            color: #fff;
            font-weight: bold;
            cursor: pointer;
            margin-top: 15px;
        }
        button:hover {
            background: #0056b3;
        }
        .back-btn {
            background: #6c757d;
        }
        .back-btn:hover {
            background: #5a6268;
        }
        .message {
            margin-bottom: 15px;
            padding: 10px;
            text-align: center;
            border-radius: 6px;
        }
        .success {
            background: #d4edda;
            color: #155724;
        }
        .error {
            background: #f8d7da;
            color: #721c24;
        }