:root {
    --primary-color: #28a745;
    --secondary-color: #ffc107;
    --danger-color: #dc3545;
    --light-color: #f8f9fa;
    --dark-color: #343a40;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f8f9fa;
}

.sidebar {
    min-height: calc(100vh - 56px);
    box-shadow: inset -1px 0 0 rgba(0, 0, 0, .1);
}

.sidebar-sticky {
    position: sticky;
    top: 56px;
    height: calc(100vh - 56px);
    padding-top: .5rem;
    overflow-x: hidden;
    overflow-y: auto;
}

.sidebar .nav-link {
    color: #333;
    margin-bottom: 5px;
    border-radius: 4px;
    padding: 8px 12px;
}

.sidebar .nav-link:hover {
    background-color: #e9ecef;
}

.sidebar .nav-link.active {
    background-color: var(--primary-color);
    color: white;
}

.sidebar .nav-link i {
    margin-right: 8px;
    width: 20px;
    text-align: center;
}

.card {
    border: none;
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    margin-bottom: 20px;
}

.card-header {
    border-radius: 8px 8px 0 0 !important;
}

.btn {
    border-radius: 4px;
}

.table th {
    background-color: #f8f9fa;
    font-weight: 600;
}

.badge {
    font-size: 85%;
    padding: 5px 10px;
}

.navbar-brand {
    font-weight: bold;
}

/* Responsive */
@media (max-width: 768px) {
    .sidebar {
        position: static;
        height: auto;
        padding-top: 0;
    }
    
    .sidebar-sticky {
        position: static;
        height: auto;
    }
    
    .navbar-brand {
        font-size: 1.2rem;
    }
}