body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f4f4f4;
    color: #333;
}

header {
    background-color: #4CAF50;
    color: white;
    padding: 15px 0;
    text-align: center;
}

header h1 {
    margin: 0;
}

nav {
    margin: 10px 0;
}

nav ul {
    list-style-type: none;
    padding: 0;
    text-align: center;
}

nav ul li {
    display: inline;
    margin: 0 10px;
}

nav ul li a {
    color: white;
    text-decoration: none;
    padding: 8px 16px;
    background-color: #333;
    border-radius: 4px;
}

nav ul li a:hover {
    background-color: #555;
}

main {
    padding: 20px;
}

footer {
    background-color: #333;
    color: white;
    text-align: center;
    padding: 10px 0;
    position: fixed;
    width: 100%;
    bottom: 0;
}

form {
    background-color: white;
    padding: 20px;
    margin: 20px auto;
    border-radius: 5px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    max-width: 500px;
}

form label {
    display: block;
    margin-bottom: 8px;
    font-weight: bold;
}

form input[type="text"],
form input[type="password"],
form input[type="date"],
form select {
    width: 100%;
    padding: 8px;
    margin-bottom: 10px;
    border: 1px solid #ccc;
    border-radius: 4px;
}

form input[type="submit"],
form button {
    background-color: #4CAF50;
    color: white;
    padding: 10px 15px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

form input[type="submit"]:hover,
form button:hover {
    background-color: #45a049;
}

#calendar {
    max-width: 900px;
    margin: 40px auto;
    background-color: white;
    border-radius: 5px;
    padding: 20px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 20px;
}

table th,
table td {
    padding: 10px;
    border: 1px solid #ccc;
    text-align: left;
}

.success {
    color: green;
}

.error {
    color: red;
}

/* Responsive Design */
@media (max-width: 600px) {
    nav ul li {
        display: block;
        margin: 5px 0;
    }

    form {
        padding: 10px;
        margin: 10px auto;
    }

    form input[type="text"],
    form input[type="password"],
    form input[type="date"],
    form select {
        padding: 6px;
    }

    form input[type="submit"],
    form button {
        padding: 8px 12px;
    }
}