:root {
    --primary-color: #2c3e50;
    --text-color: #333;
    --bg-color: #f9f9fafb;
    --container-bg: #ffffff;
    --link-color: #3498db;
    --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

body {
    font-family: var(--font-family);
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
    margin: 0;
    padding: 0;
}

.container {
    max-width: 800px;
    margin: 40px auto;
    padding: 20px;
    background: var(--container-bg);
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    border-radius: 8px;
}

header {
    border-bottom: 1px solid #eee;
    padding-bottom: 20px;
    margin-bottom: 30px;
}

h1 {
    color: var(--primary-color);
    font-size: 2.2em;
    margin-bottom: 10px;
}

h2 {
    color: var(--primary-color);
    font-size: 1.5em;
    margin-top: 30px;
    margin-bottom: 15px;
}

h3 {
    color: var(--text-color);
    font-size: 1.2em;
    margin-top: 25px;
    margin-bottom: 10px;
}

p {
    margin-bottom: 15px;
}

ul {
    margin-bottom: 15px;
    padding-left: 20px;
}

li {
    margin-bottom: 5px;
}

a {
    color: var(--link-color);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

.last-updated {
    color: #666;
    font-size: 0.9em;
    font-style: italic;
}

footer {
    margin-top: 50px;
    padding-top: 20px;
    border-top: 1px solid #eee;
    text-align: center;
    font-size: 0.9em;
    color: #666;
}

@media (max-width: 600px) {
    .container {
        margin: 0;
        border-radius: 0;
        box-shadow: none;
        padding: 20px;
    }
}