/* System Font Stack */
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";
    background-color: #f8f9fa;
    color: #212529;
}

.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    height: 100%;
    width: 240px;
    background-color: #ffffff;
    border-right: 1px solid #e7e7e7;
    padding: 1rem;
}

.sidebar h4 {
    color: #007bff;
    font-weight: 700;
}

.sidebar .nav-link {
    color: #6c757d;
    font-size: 1rem;
    margin-bottom: 0.5rem;
}

.sidebar .nav-link:hover, .sidebar .nav-link.active {
    color: #007bff;
}

.sidebar .nav-link .bi {
    margin-right: 0.8rem;
    font-size: 1.2rem;
}

.main-content {
    margin-left: 240px;
    padding: 2rem;
}

.kpi-card {
    background-color: #ffffff;
    border: 1px solid #e7e7e7;
    border-radius: 0.5rem;
    padding: 1.5rem;
    color: #212529;
    transition: box-shadow 0.2s ease-in-out, transform 0.2s ease-in-out;
}

.kpi-card:hover {
    box-shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.1);
    transform: translateY(-2px);
}

.kpi-card h5 {
    color: #6c757d;
    font-size: 0.9rem;
    text-transform: uppercase;
    font-weight: 600;
    margin-bottom: 1rem;
}

.kpi-card .value {
    font-size: 2.2rem;
    font-weight: 700;
    color: #212529;
}

.kpi-card .icon {
    font-size: 2.8rem;
    color: #007bff;
    opacity: 0.2;
}

.card {
    border: 1px solid #e7e7e7;
    box-shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
}

.table {
    color: #212529;
}

.table thead th {
    font-weight: 600;
    color: #495057;
}