body {
    font-family: Arial, sans-serif;
    margin: 20px;
    background: #f9f9f9;
    color: #333;
}

header h1 {
    margin-bottom: 0;
}

nav a {
    text-decoration: none;
    color: #007bff;
    margin-right: 15px;
}

nav a:hover {
    text-decoration: underline;
}

.login-container {
    max-width: 400px;
    margin: 50px auto;
    padding: 25px;
    background: white;
    border: 1px solid #ddd;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.login-container h2 {
    text-align: center;
    margin-bottom: 20px;
}

input[type=text], input[type=password], select {
    width: 100%;
    padding: 10px;
    margin: 5px 0 15px 0;
    border: 1px solid #ccc;
    border-radius: 3px;
}

button {
    width: 100%;
    padding: 10px;
    background: #007bff;
    border: none;
    color: white;
    font-size: 16px;
    cursor: pointer;
    border-radius: 3px;
}

button:hover {
    background: #0056b3;
}

.error {
    color: red;
}

.message {
    color: green;
}