body {
    background: #f5f7fb;
}

.sidebar {
    width: 260px;
    height: 100vh;
    position: fixed;
    left: 0;
    top: 0;
    background: #1e293b;
    overflow-y: auto;
    z-index: 1000;
}

.sidebar-nav .nav-link {
    color: #cbd5e1;
    padding: 10px 20px;
    font-size: 0.95rem;
}

.sidebar-nav .nav-link:hover,
.sidebar-nav .nav-link.active {
    background: #334155;
    color: #fff;
}

.main-content {
    margin-left: 260px;
    min-height: 100vh;
}

.topbar {
    background: #fff;
    padding: 12px 20px;
    border-bottom: 1px solid #e2e8f0;
    position: sticky;
    top: 0;
    z-index: 100;
}

.kpi-card {
    border: none;
    border-radius: 12px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.08);
    transition: transform 0.15s;
}

.kpi-card:hover {
    transform: translateY(-2px);
}

.kpi-card .kpi-value {
    font-size: 1.75rem;
    font-weight: 700;
    color: #1e293b;
}

.kpi-card .kpi-label {
    color: #64748b;
    font-size: 0.85rem;
}

.kpi-icon {
    width: 48px;
    height: 48px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
}

.card {
    border: none;
    border-radius: 12px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.06);
}

.login-wrapper {
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, #1e293b 0%, #334155 100%);
}

.login-card {
    border: none;
    border-radius: 16px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.3);
}

@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
    }
    .main-content {
        margin-left: 0;
    }
}