* {
    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: #333;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    background: white;
    border-radius: 10px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
    overflow: hidden;
}

header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 60px 40px;
    text-align: center;
}

header h1 {
    font-size: 2.5em;
    margin-bottom: 10px;
}

.subtitle {
    font-size: 1.2em;
    opacity: 0.9;
}

main {
    padding: 40px;
}

.card {
    background: #f8f9fa;
    border-radius: 8px;
    padding: 30px;
    margin-bottom: 30px;
    border-left: 4px solid #667eea;
}

.card:last-child {
    margin-bottom: 0;
}

.card h2 {
    color: #667eea;
    margin-bottom: 15px;
    font-size: 1.5em;
}

.card p {
    margin-bottom: 15px;
}

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

.card li {
    margin-bottom: 8px;
}

code {
    background: #e9ecef;
    padding: 2px 6px;
    border-radius: 3px;
    font-family: 'Courier New', monospace;
    font-size: 0.9em;
}

pre {
    background: #2d3748;
    color: #fff;
    padding: 15px;
    border-radius: 5px;
    overflow-x: auto;
    margin: 15px 0;
}

pre code {
    background: none;
    color: #fff;
    padding: 0;
}

footer {
    background: #f8f9fa;
    text-align: center;
    padding: 20px;
    color: #666;
    border-top: 1px solid #e9ecef;
}

@media (max-width: 768px) {
    header h1 {
        font-size: 2em;
    }
    
    .subtitle {
        font-size: 1em;
    }
    
    header, main {
        padding: 30px 20px;
    }
    
    .card {
        padding: 20px;
    }
}