:root {
    --primary-color: #0d6efd;
    --secondary-color: #6c757d;
    --success-color: #198754;
    --danger-color: #dc3545;
    --warning-color: #ffc107;
    --info-color: #0dcaf0;
    --light-bg: #f8f9fa;
    --border-radius: 0.375rem;
    --shadow-sm: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
    --shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.15);
}

body {
    background-color: var(--light-bg);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    font-size: 0.9375rem;
    line-height: 1.6;
    color: #212529;
}

#page-wrapper {
    min-height: 100vh;
    display: flex;
}

.sidebar-collapsed aside {
    transform: translateX(-250px);
    transition: transform 0.3s ease;
}

aside {
    min-width: 240px;
    max-width: 240px;
    min-height: 100vh;
    position: sticky;
    top: 0;
    box-shadow: var(--shadow-sm);
}

main {
    background: #fff;
    flex: 1;
    min-height: 100vh;
}

.card {
    border: none;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    transition: box-shadow 0.15s ease-in-out;
}

.card:hover {
    box-shadow: var(--shadow);
}

.card-header {
    background-color: #fff;
    border-bottom: 1px solid #dee2e6;
    font-weight: 600;
}

.badge {
    font-size: 0.75rem;
    font-weight: 500;
    padding: 0.35em 0.65em;
}

.table {
    font-size: 0.9rem;
}

.table thead th {
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 0.5px;
    color: #6c757d;
    border-bottom: 2px solid #dee2e6;
}

.table-hover tbody tr:hover {
    background-color: #f8f9fa;
}

.btn {
    font-weight: 500;
    border-radius: var(--border-radius);
    transition: all 0.15s ease-in-out;
}

.btn-sm {
    font-size: 0.875rem;
    padding: 0.25rem 0.5rem;
}

.form-control, .form-select {
    border-radius: var(--border-radius);
    transition: border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
}

.form-control:focus, .form-select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(13, 110, 253, 0.25);
}

.alert {
    border-radius: var(--border-radius);
    border: none;
}

.pagination {
    margin-bottom: 0;
}

.page-link {
    border-radius: var(--border-radius);
    margin: 0 0.125rem;
    color: var(--primary-color);
}

.page-item.active .page-link {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

.loading {
    opacity: 0.6;
    pointer-events: none;
}

.spinner-border-sm {
    width: 1rem;
    height: 1rem;
    border-width: 0.15em;
}

.amount-display {
    font-family: monospace;
    letter-spacing: 0.1em;
    user-select: none;
}

.toggle-amount {
    cursor: pointer;
    transition: opacity 0.2s ease;
}

.toggle-amount:hover {
    opacity: 0.7;
}

.toggle-amount:focus {
    outline: none;
    box-shadow: none;
}

@media (max-width: 768px) {
    aside {
        position: fixed;
        z-index: 1000;
        transform: translateX(-100%);
    }
    
    .sidebar-collapsed aside {
        transform: translateX(0);
    }
    
    main {
        margin-left: 0;
    }
}