/* Global styles */
        body {
            font-family: 'Arial', sans-serif;
            margin: 0;
            padding: 0;
            background: #f3f4f6; /* Light neutral background */
            color: #333;
            display: flex;
            justify-content: center;
            align-items: center;
            min-height: 100vh;
        }

        /* Container styles */
        .container {
            background: #fff;
            width: 90%;
            max-width: 400px;
            padding: 20px 30px;
            box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
            border-radius: 8px;
            text-align: center;
        }

        /* Heading styles */
        h1 {
            margin-bottom: 20px;
            color: #222;
            font-size: 1.8rem;
            font-weight: bold;
        }

        /* Error message styles */
        .error {
            color: red;
            font-size: 0.9rem;
            margin-bottom: 10px;
        }

        /* Form styles */
        form {
            display: flex;
            flex-direction: column;
            gap: 15px;
        }

        /* Input fields */
        input[type="text"],
        input[type="password"] {
            width: 100%;
            padding: 10px;
            font-size: 1rem;
            border: 1px solid #ccc;
            border-radius: 5px;
            box-sizing: border-box;
            outline: none;
            transition: border 0.3s ease, box-shadow 0.3s ease;
        }

        input[type="text"]:focus,
        input[type="password"]:focus {
            border-color: #007bff;
            box-shadow: 0 0 4px rgba(0, 123, 255, 0.5);
        }

        /* Submit button */
        button {
            background: #007bff;
            color: #fff;
            padding: 10px;
            font-size: 1rem;
            border: none;
            border-radius: 5px;
            cursor: pointer;
            transition: background 0.3s ease;
        }

        button:hover {
            background: #0056b3;
        }

        /* Signup link */
        .signup-link {
            margin-top: 20px;
            font-size: 0.9rem;
        }

        .signup-link a {
            color: #007bff;
            text-decoration: none;
            font-weight: bold;
        }

        .signup-link a:hover {
            text-decoration: underline;
        }

        /* Responsive adjustments */
        @media (max-width: 600px) {
            h1 {
                font-size: 1.5rem;
            }

            button {
                padding: 12px;
                font-size: 0.9rem;
            }
        }