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

.container {
    max-width: 1200px;
    margin: 0 auto;
}

.card {
    box-shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.15);
    border: none;
    border-radius: 0.5rem;
    overflow: hidden;
}

.card-header {
    background-color: #f8f9fa;
    border-bottom: 1px solid rgba(0, 0, 0, 0.125);
    padding: 1rem 1.25rem;
}

.card-header h5 {
    margin: 0;
    font-weight: 600;
}

.table {
    margin-bottom: 0;
}

.table th {
    position: relative;
    background-color: #f8f9fa;
    font-weight: 600;
    white-space: nowrap;
}

.table th .remove-col {
    position: absolute;
    top: 0;
    right: 0;
    padding: 0.25rem 0.5rem;
    color: #dc3545;
    cursor: pointer;
    opacity: 0.5;
    transition: opacity 0.2s;
}

.table th:hover .remove-col {
    opacity: 1;
}

.table td, .table th {
    vertical-align: middle;
    padding: 0.75rem;
}

.btn-group {
    gap: 0.5rem;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.btn:disabled {
    cursor: not-allowed;
}

.table-responsive {
    max-height: 60vh;
    overflow-y: auto;
}

/* Custom scrollbar */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb {
    background: #888;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #555;
}