body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f4f4f9;
    color: #333;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.container {
    width: 1140px;
    margin: auto;
}

header {
    background: #444;
    color: #fff;
    padding: 15px 20px;
    text-align: center;
}

header h1 {
    margin: 0;
}

nav ul {
    background: #333;
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: space-between;
    width: 100%;
    box-sizing: border-box;
}

nav ul li {
    flex: 1;
    text-align: center;
    margin: 0;
}

nav ul li a {
    color: #fff;
    text-decoration: none;
    padding: 15px 0;
    display: block;
    width: 100%;
    box-sizing: border-box;
}

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

main {
    flex-grow: 1;
    margin: 0 auto;
    width: 100%;
    max-width: 1200px;
    box-sizing: border-box;
}

h2, h3 {
    color: #444;
    margin-bottom: 10px;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
}

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

table th {
    background: #f4f4f4;
}

form label {
    display: block;
    margin: 10px 0 5px;
}

form input, form textarea, form button {
    width: 100%;
    padding: 10px;
    margin: 5px 0 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
}

form button {
    background: #444;
    color: #fff;
    border: none;
    cursor: pointer;
}

form button:hover {
    background: #555;
}

img, video {
    max-width: 100%;
    height: auto;
    margin: 10px 0;
}

@media (max-width: 768px) {
    nav ul {
        flex-direction: column;
    }

    nav ul li a {
        text-align: center;
    }
}