body { margin: 0; font-family: sans-serif; display: flex; }
.app-container { display: flex; width: 100%; height: 100vh; }

.sidebar {
    width: 280px;
    background: #f8f9fa;
    border-right: 1px solid #e0e0e0;
    overflow-y: auto;
    padding: 20px;
}

.sidebar ul { list-style: none; padding-left: 15px; }
.sidebar li { margin: 5px 0; }
.sidebar a { text-decoration: none; color: #333; font-size: 0.9em; }
.sidebar a:hover { color: #007acc; }

.content { flex: 1; overflow-y: auto; padding: 40px; }
.markdown-body { max-width: 800px; margin: 0 auto; }