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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: #1d1d1f;
    background: #f5f5f7;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 40px 20px;
}

header {
    text-align: center;
    margin-bottom: 50px;
}

h1 {
    font-size: 48px;
    font-weight: 600;
    margin-bottom: 16px;
    color: #1d1d1f;
}

.subtitle {
    font-size: 21px;
    color: #6e6e73;
    margin-bottom: 30px;
}

.content {
    background: white;
    padding: 40px;
    border-radius: 18px;
    box-shadow: 0 4px 16px rgba(0,0,0,0.1);
}

h2 {
    font-size: 32px;
    margin-top: 40px;
    margin-bottom: 16px;
    color: #1d1d1f;
}

h3 {
    font-size: 24px;
    margin-top: 30px;
    margin-bottom: 12px;
    color: #1d1d1f;
}

p {
    margin-bottom: 16px;
    color: #1d1d1f;
}

ul, ol {
    margin-left: 24px;
    margin-bottom: 16px;
}

li {
    margin-bottom: 8px;
}

a {
    color: #007aff;
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

.nav-links {
    text-align: center;
    margin-top: 30px;
    padding-top: 30px;
    border-top: 1px solid #d2d2d7;
}

.nav-links a {
    margin: 0 15px;
    font-weight: 500;
}

footer {
    text-align: center;
    padding: 40px 20px;
    color: #6e6e73;
    font-size: 14px;
}

.last-updated {
    color: #86868b;
    font-size: 14px;
    margin-top: 20px;
    padding-top: 20px;
    border-top: 1px solid #d2d2d7;
}

main {
    flex: 1;
}