body {
    font-family: 'Roboto', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
    background-color: #F4F7F6;
}

.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    height: 100%;
    width: 250px;
    background-color: #FFFFFF;
    padding-top: 1rem;
    border-right: 1px solid #e0e0e0;
}

.sidebar .nav-link {
    color: #333;
    font-weight: 500;
}

.sidebar .nav-link.active,
.sidebar .nav-link:hover {
    color: #4A90E2;
    background-color: #e9f2fa;
}

.sidebar .nav-link .feather {
    margin-right: 10px;
}

.main-content {
    margin-left: 250px;
    padding: 2rem;
}

.summary-card {
    border: none;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    transition: transform 0.2s;
}

.summary-card:hover {
    transform: translateY(-5px);
}

.summary-card .card-img-top {
    border-top-left-radius: 8px;
    border-top-right-radius: 8px;
}