body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    margin: 0;
    background-color: #f4f7fa;
    color: #333;
}

#root {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.dashboard {
    display: flex;
    flex: 1;
}

.sidebar {
    width: 240px;
    background-color: #fff;
    border-right: 1px solid #e0e0e0;
    padding: 20px;
}

.sidebar h2 {
    font-size: 1.5rem;
    margin-bottom: 20px;
}

.sidebar ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.sidebar li a {
    display: block;
    padding: 10px 15px;
    text-decoration: none;
    color: #555;
    border-radius: 4px;
    margin-bottom: 5px;
}

.sidebar li a:hover, .sidebar li a.active {
    background-color: #eef2f5;
    color: #007bff;
}

.main-content {
    flex: 1;
    padding: 20px;
}

.header {
    background-color: #fff;
    border-bottom: 1px solid #e0e0e0;
    padding: 20px;
    margin-bottom: 20px;
}

.header h1 {
    margin: 0;
    font-size: 1.8rem;
}

.card {
    background-color: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    padding: 20px;
    margin-bottom: 20px;
}

.card h3 {
    margin-top: 0;
}