body {
    background: #f5f6fa;
    font-family: 'Segoe UI', system-ui, sans-serif;
}
.navbar { background: linear-gradient(135deg, #2c3e50 0%, #3498db 100%) !important; }
.stat-card {
    border: none;
    border-radius: 12px;
    transition: transform 0.2s;
}
.stat-card:hover { transform: translateY(-2px); }
.stat-card .card-body { padding: 1.25rem; }
.stat-card .stat-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
}
.stat-card .stat-value { font-size: 1.75rem; font-weight: 700; }
.stat-card .stat-label { font-size: 0.85rem; color: #6c757d; }
.table th { font-weight: 600; font-size: 0.85rem; text-transform: uppercase; color: #6c757d; }
.badge-late { background: #e74c3c; }
.badge-ontime { background: #27ae60; }
.device-online { color: #27ae60; }
.device-offline { color: #95a5a6; }
.sync-log-item { font-size: 0.85rem; padding: 0.5rem 0; border-bottom: 1px solid #eee; }
.chart-container { position: relative; height: 300px; }
.filter-bar { background: #fff; border-radius: 8px; padding: 1rem; margin-bottom: 1rem; box-shadow: 0 1px 3px rgba(0,0,0,0.1); }
.page-header { margin-bottom: 1.5rem; }
.page-header h2 { font-weight: 700; color: #2c3e50; }