body {
    background: #0f1419;
    color: #e6e6e6;
}
.sidebar {
    background: #161b22;
    min-height: calc(100vh - 56px);
    border-right: 1px solid #30363d;
}
.sidebar .nav-link {
    color: #c9d1d9;
    border-radius: 6px;
    margin-bottom: 4px;
}
.sidebar .nav-link:hover {
    background: #21262d;
    color: #fff;
}
.card {
    background: #161b22;
    border: 1px solid #30363d;
}
.card-header {
    background: #1c2128;
    border-bottom: 1px solid #30363d;
}
.table {
    color: #c9d1d9;
}
.table thead th {
    border-color: #30363d;
    color: #8b949e;
}
.table td {
    border-color: #21262d;
}
.btn-primary {
    background: #2f81f7;
    border-color: #2f81f7;
}
.stat-card {
    text-align: center;
    padding: 20px;
}
.stat-card .num {
    font-size: 2rem;
    font-weight: 700;
    color: #2f81f7;
}
.stat-card .lbl {
    color: #8b949e;
    font-size: 0.85rem;
}
.table-responsive {
    overflow-x: auto;
}
.table td, .table th {
    vertical-align: middle;
}
@media (max-width: 768px) {
    .sidebar {
        min-height: auto;
    }
}
@media (max-width: 576px) {
    .table {
        font-size: 0.85rem;
    }
    h3 {
        font-size: 1.2rem;
    }
    .stat-card .num {
        font-size: 1.4rem;
    }
    .stat-card {
        padding: 12px;
    }
}