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

.sidebar {
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
    z-index: 100;
    padding: 0;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.sidebar .nav-link {
    font-weight: 500;
    color: #495057;
    padding: 0.75rem 1rem;
    border-left: 3px solid transparent;
}

.sidebar .nav-link:hover {
    color: #0d6efd;
    background-color: #e9ecef;
}

.sidebar .nav-link.active {
    color: #0d6efd;
    background-color: #e9ecef;
    border-left-color: #0d6efd;
}

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

main {
    padding-top: 20px;
}

.card {
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.08);
    margin-bottom: 20px;
}

.card-header {
    border-radius: 10px 10px 0 0 !important;
    font-weight: 600;
}

.badge {
    font-weight: 500;
}

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

.btn {
    border-radius: 5px;
    padding: 0.5rem 1rem;
    font-weight: 500;
}

.btn i {
    margin-right: 5px;
}

.alert {
    border-radius: 8px;
    border: none;
}

/* Responsive */
@media (max-width: 768px) {
    .sidebar {
        position: relative;
        width: 100%;
    }
    
    main {
        margin-left: 0 !important;
        padding: 10px;
    }
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.card {
    animation: fadeIn 0.5s ease-out;
}

/* Custom badges */
.badge.bg-primary { background-color: #0d6efd !important; }
.badge.bg-success { background-color: #198754 !important; }
.badge.bg-info { background-color: #0dcaf0 !important; }
.badge.bg-warning { background-color: #ffc107 !important; color: #000 !important; }
.badge.bg-danger { background-color: #dc3545 !important; }
.badge.bg-secondary { background-color: #6c757d !important; }

/* Table hover effect */
.table-hover tbody tr:hover {
    background-color: #f8f9fa;
    cursor: pointer;
    transform: scale(1.01);
    transition: transform 0.2s;
}

/* Form validation */
.form-control.is-invalid {
    border-color: #dc3545;
}

.form-control.is-valid {
    border-color: #198754;
}

/* Loading spinner */
.spinner-border {
    width: 3rem;
    height: 3rem;
}

/* Print styles */
@media print {
    .sidebar, .navbar, .btn, .no-print {
        display: none !important;
    }
    
    main {
        margin-left: 0 !important;
    }
    
    .card {
        box-shadow: none !important;
        border: 1px solid #ddd;
    }
}