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

body {
    font-family: 'Georgia', 'Times New Roman', serif;
    line-height: 1.6;
    color: #333;
    background-color: #fdfdfd;
    max-width: 900px;
    margin: 0 auto;
    padding: 20px;
}

header {
    border-bottom: 3px solid #2c3e50;
    padding-bottom: 20px;
    margin-bottom: 40px;
}

h1 {
    font-size: 2.5em;
    color: black;
    margin-bottom: 10px;
}

nav {
    margin-top: 15px;
}

nav a {
    margin-right: 20px;
    text-decoration: none;
    color: #2c3e50;
    font-weight: bold;
    font-size: 1.1em;
}

nav a:hover {
    color: #3498db;
    text-decoration: underline;
}

h2 {
    font-size: 1.8em;
    color: gray;
    margin: 30px 0 15px;
    border-bottom: 1px solid #ddd;
    padding-bottom: 8px;
}

h3 {
    font-size: 1.4em;
    color: gray;
    margin: 20px 0 10px;
}

p {
    margin-bottom: 15px;
    text-align: justify;
}

ul, ol {
    margin: 15px 0;
    padding-left: 30px;
}

li {
    margin-bottom: 8px;
}

a {
    color: #3498db;
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

section {
    margin-bottom: 50px;
}

footer {
    margin-top: 60px;
    padding-top: 20px;
    border-top: 1px solid #eee;
    text-align: center;
    color: #777;
    font-size: 0.9em;
}

@media (max-width: 768px) {
    body {
        padding: 15px;
    }
    
    h1 {
        font-size: 2em;
    }
    
    nav a {
        display: block;
        margin: 10px 0;
    }
}