body {
    font-family: Arial, sans-serif;
    background: #f4f4f4;
    margin: 0;
    padding: 2rem;
}
.container {
    background: white;
    max-width: 600px;
    margin: auto;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
}
input, button, select {
    display: block;
    width: 100%;
    margin-bottom: 1rem;
    padding: 0.7rem;
    font-size: 1rem;
}
button {
    background: #007bff;
    color: white;
    border: none;
    cursor: pointer;
}
button:hover {
    background: #0056b3;
}
.hidden {
    display: none;
}