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

.navbar {
    background-color: #333;
    color: white;
    padding: 10px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.navbar h1 {
    margin: 0;
}

.navbar nav a {
    color: white;
    margin-left: 10px;
    text-decoration: none;
}

.container {
    max-width: 1200px;
    margin: 20px auto;
    padding: 20px;
    background: white;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
}

.categories {
    margin-bottom: 40px;
}

.category {
    border: 1px solid #ddd;
    padding: 10px;
    margin-bottom: 10px;
}

.threads table {
    width: 100%;
    border-collapse: collapse;
}

.threads th, .threads td {
    border: 1px solid #ddd;
    padding: 10px;
    text-align: left;
}

.threads th {
    background-color: #f4f4f4;
}

.post-form {
    margin-top: 20px;
}

.post-form input, .post-form textarea {
    width: 100%;
    margin-bottom: 10px;
    padding: 10px;
}

button {
    background-color: #333;
    color: white;
    padding: 10px;
    border: none;
    cursor: pointer;
}

footer {
    text-align: center;
    padding: 10px;
    background-color: #333;
    color: white;
}