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

header {
    background-color: #007bff;
    color: white;
    padding: 1rem;
    text-align: center;
}

nav {
    background-color: #e9ecef;
    padding: 0.5rem;
}

nav a {
    margin-right: 1rem;
    color: #007bff;
    text-decoration: none;
}

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

main {
    padding: 1rem;
    max-width: 1200px;
    margin: 0 auto;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 1rem;
}

th, td {
    border: 1px solid #ddd;
    padding: 0.5rem;
    text-align: left;
}

th {
    background-color: #007bff;
    color: white;
}

.btn {
    display: inline-block;
    background-color: #007bff;
    color: white;
    padding: 0.5rem 1rem;
    text-decoration: none;
    margin: 0.5rem 0;
    border-radius: 4px;
}

.btn:hover {
    background-color: #0056b3;
}

form {
    background: white;
    padding: 1rem;
    border-radius: 4px;
}

input, textarea, select {
    width: 100%;
    padding: 0.5rem;
    margin: 0.5rem 0;
    border: 1px solid #ddd;
    border-radius: 4px;
}

button {
    background-color: #28a745;
    color: white;
    padding: 0.5rem 1rem;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

button:hover {
    background-color: #218838;
}

.alert {
    padding: 1rem;
    margin: 1rem 0;
    border-radius: 4px;
    background-color: #d4edda;
    border: 1px solid #c3e6cb;
    color: #155724;
}

@media (max-width: 768px) {
    table {
        font-size: 0.8rem;
    }
    nav a {
        display: block;
        margin: 0.5rem 0;
    }
}