body {
    font-family: system-ui, -apple-system, sans-serif;
    max-width: 800px;
    margin: 2rem auto;
    padding: 0 1rem;
    line-height: 1.6;
}

header {
    background: #1a3a5c;
    color: #fff;
    padding: 1.25rem 1.5rem;
    margin-bottom: 1.5rem;
    border-radius: 6px;
}

header h1 {
    margin: 0 0 0.25rem;
    font-size: 1.5rem;
}

header .header-note {
    margin: 0;
    font-size: 0.9rem;
    opacity: 0.8;
}

header .header-note code {
    background: rgba(255, 255, 255, 0.2);
    padding: 0.1em 0.3em;
    border-radius: 3px;
    color: #fff;
}

footer {
    background: #f0f0f0;
    padding: 1rem;
    margin: 1rem 0;
    border-radius: 4px;
}

aside {
    background: #e8f4f8;
    padding: 1rem;
    margin: 1rem 0;
    border-left: 4px solid #0066cc;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1rem;
    margin: 2rem 0;
}

.feature-card {
    border: 1px solid #ddd;
    padding: 1rem;
    border-radius: 4px;
}

.feature-card h3 {
    margin-top: 0;
}

code {
    background: #f5f5f5;
    padding: 0.2em 0.4em;
    border-radius: 3px;
    font-size: 0.9em;
}

pre {
    background: #f5f5f5;
    padding: 1rem;
    border-radius: 4px;
    overflow-x: auto;
}