:root {
    --primary-color: #007AFF;
    --text-color: #333;
    --bg-color: #f5f5f7;
    --card-bg: #ffffff;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
    margin: 0;
    padding: 20px;
    display: flex;
    justify-content: center;
}

.container {
    max-width: 800px;
    background: var(--card-bg);
    padding: 40px;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

h1 {
    font-size: 2.5em;
    margin-bottom: 0.5em;
    color: #1a1a1a;
}

h2 {
    margin-top: 1.5em;
    color: #1a1a1a;
    border-bottom: 1px solid #eee;
    padding-bottom: 10px;
}

h3 {
    margin-top: 1.2em;
    color: #444;
}

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

a:hover {
    text-decoration: underline;
}

ul {
    padding-left: 20px;
}

li {
    margin-bottom: 10px;
}

.footer {
    margin-top: 40px;
    padding-top: 20px;
    border-top: 1px solid #eee;
    font-size: 0.9em;
    color: #666;
    text-align: center;
}

@media (max-width: 600px) {
    .container {
        padding: 20px;
    }
    h1 {
        font-size: 2em;
    }
}