body {
    font-family: Arial, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    background-color: #f9f9f9;
}

.signin-container, .next-page-container, .container {
    text-align: center;
    background: #ffffff;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
    width: 100%;
    max-width: 400px;
}

.logo {
    width: 100px;
    margin-bottom: 1rem;
}

h1 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: #333;
}

input, select, button {
    width: 100%;
    padding: 0.8rem;
    margin-bottom: 1rem;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 1rem;
}

button {
    background-color: #007BFF;
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    cursor: pointer;
    transition: background-color 0.3s;
}

button:hover {
    background-color: #0056b3;
}

.error-message {
    color: red;
    font-size: 0.9rem;
    margin-top: 0.5rem;
    display: none;
}

.calendar {
    margin-bottom: 1rem;
}

#formSection {
    display: none;
}