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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: #333;
    background: #f5f5f5;
    max-width: 900px;
    margin: 0 auto;
    padding: 20px;
}

header {
    border-bottom: 2px solid #007acc;
    padding-bottom: 15px;
    margin-bottom: 30px;
}

header h1 {
    color: #007acc;
    margin-bottom: 10px;
}

nav a {
    color: #555;
    text-decoration: none;
    margin-right: 20px;
    padding: 5px 10px;
    border-radius: 4px;
    transition: background 0.2s;
}

nav a:hover {
    background: #007acc;
    color: white;
}

main {
    background: white;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

main h2 {
    color: #333;
    margin-bottom: 15px;
}

main h3 {
    color: #555;
    margin: 20px 0 10px;
}

main p {
    margin-bottom: 10px;
}

main ul {
    margin: 10px 0 20px 30px;
}

main li {
    margin-bottom: 5px;
}

footer {
    text-align: center;
    margin-top: 30px;
    color: #999;
    font-size: 0.9em;
}

@media (max-width: 600px) {
    body { padding: 10px; }
    nav a { display: block; margin-bottom: 5px; }
}

table {
    border-collapse: collapse;
    width: 100%;
    margin: 15px 0;
}

table th, table td {
    border: 1px solid #ddd;
    padding: 8px 12px;
    text-align: left;
}

table th {
    background: #007acc;
    color: white;
}

table tr:nth-child(even) {
    background: #f9f9f9;
}