* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: Arial, sans-serif;
    background: #f4f6f8;
    line-height: 1.6;
    color: #333;
}

.container {
    width: 100%;
    padding: 15px;
}

.nav-menu {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 20px;
}

.nav-menu a {
    text-decoration: none;
    background: #3498db;
    color: white;
    padding: 10px;
    border-radius: 6px;
    text-align: center;
    transition: 0.3s;
}

.nav-menu a:hover {
    background: #2980b9;
}

.content {
    background: white;
    padding: 20px;
    border-radius: 8px;
    margin-bottom: 20px;
}

.content h1 {
    margin-bottom: 10px;
    color: #2c3e50;
}

.sidebar {
    display: none;
}

@media (min-width: 768px) {
    .nav-menu {
        flex-direction: row;
        justify-content: center;
        gap: 20px;
    }

    .container {
        padding: 30px;
    }
}

@media (min-width: 1024px) {
    .container {
        display: flex;
        max-width: 1200px;
        margin: 0 auto;
        gap: 30px;
    }

    .content {
        flex: 3;
    }

    .sidebar {
        display: block;
        flex: 1;
        background: white;
        padding: 20px;
        border-radius: 8px;
    }
}