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

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

/* Navigation */
nav {
    background-color: #2c3e50;
    padding: 0 20px;
}

nav ul {
    list-style: none;
    display: flex;
    align-items: center;
}

nav ul li a {
    display: block;
    padding: 16px 20px;
    color: #ecf0f1;
    text-decoration: none;
    font-size: 15px;
    transition: background-color 0.3s;
}

nav ul li a:hover,
nav ul li a.active {
    background-color: #3498db;
    color: #fff;
}

/* Main content */
main {
    max-width: 900px;
    margin: 40px auto;
    padding: 30px;
    background-color: #fff;
    border-radius: 6px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

main h1 {
    margin-bottom: 16px;
    color: #2c3e50;
}

main p {
    line-height: 1.7;
    margin-bottom: 12px;
}

/* Content lists */
main ul {
    margin-left: 20px;
    line-height: 2;
}

/* Footer */
footer {
    text-align: center;
    padding: 20px;
    background-color: #2c3e50;
    color: #ecf0f1;
    font-size: 14px;
    margin-top: 40px;
}