body {
    font-family: system-ui, sans-serif;
    line-height: 1.6;
    color: #333;
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
    background: #fafafa;
}
header {
    text-align: center;
    border-bottom: 2px solid #eee;
    padding-bottom: 10px;
}
nav ul {
    list-style: none;
    padding: 0;
    background: #eee;
    overflow: hidden;
}
nav li {
    float: left;
}
nav a {
    display: block;
    padding: 12px 16px;
    text-decoration: none;
    color: #333;
}
nav a:hover {
    background: #ddd;
}
section {
    margin: 30px 0;
    padding: 20px;
    background: white;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}
h2 {
    border-left: 4px solid #007acc;
    padding-left: 10px;
    color: #005a87;
}
table {
    width: 100%;
    border-collapse: collapse;
    margin: 15px 0;
}
th, td {
    border: 1px solid #ddd;
    padding: 8px;
    text-align: left;
}
th {
    background: #f2f2f2;
}
tr:nth-child(even) {background: #f9f9f9;}
ul {
    padding-left: 20px;
}
ol {
    padding-left: 20px;
}
footer {
    text-align: center;
    font-size: 0.9em;
    color: #666;
    border-top: 1px solid #eee;
    padding-top: 10px;
    margin-top: 30px;
}