:root {
    --primary-color: #0d6efd;
    --success-color: #198754;
    --danger-color: #dc3545;
    --warning-color: #ffc107;
    --info-color: #0dcaf0;
    --light-color: #f8f9fa;
    --dark-color: #212529;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: #f5f5f5;
    padding-bottom: 2rem;
}

.navbar-brand {
    font-weight: 600;
    font-size: 1.5rem;
}

.page-content {
    animation: fadeIn 0.3s ease-in;
}

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

.card {
    border: none;
    box-shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
    margin-bottom: 1rem;
}

.card-header {
    background-color: #fff;
    border-bottom: 2px solid var(--primary-color);
    font-weight: 600;
}

.table-hover tbody tr {
    cursor: pointer;
    transition: background-color 0.2s;
}

.transaction-income {
    color: var(--success-color);
    font-weight: 600;
}

.transaction-expense {
    color: var(--danger-color);
    font-weight: 600;
}

.category-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem;
    margin-bottom: 0.5rem;
    border-radius: 0.375rem;
    background-color: #fff;
    border: 1px solid #dee2e6;
    transition: all 0.2s;
}

.category-item:hover {
    box-shadow: 0 0.25rem 0.5rem rgba(0, 0, 0, 0.1);
    transform: translateY(-2px);
}

.category-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    font-size: 1.2rem;
    color: #fff;
    margin-right: 1rem;
}

.category-info {
    flex: 1;
}

.category-actions button {
    margin-left: 0.25rem;
}

.btn-group {
    box-shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
}

.chart-container {
    position: relative;
    height: 300px;
}

canvas {
    max-height: 300px;
}

/* Modal Enhancements */
.modal-content {
    border: none;
    box-shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.15);
}

.modal-header {
    background-color: var(--primary-color);
    color: #fff;
    border-bottom: none;
}

.modal-header .btn-close {
    filter: brightness(0) invert(1);
}

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

/* Responsive */
@media (max-width: 768px) {
    .navbar-brand {
        font-size: 1.25rem;
    }
    
    .card-body h2 {
        font-size: 1.5rem;
    }
    
    .table {
        font-size: 0.875rem;
    }
}

/* Loading Spinner */
.spinner-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
}

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

/* Toast Notifications */
.toast-container {
    position: fixed;
    top: 70px;
    right: 1rem;
    z-index: 1080;
}

.toast {
    min-width: 300px;
}

/* Stat Cards */
.stat-card {
    transition: transform 0.2s;
}

.stat-card:hover {
    transform: translateY(-5px);
}

/* Period Buttons */
button[data-period] {
    transition: all 0.2s;
}

button[data-period].active {
    background-color: var(--primary-color);
    color: #fff;
    border-color: var(--primary-color);
}

/* Action Buttons */
.action-btn {
    padding: 0.25rem 0.5rem;
    font-size: 0.875rem;
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 3rem 1rem;
    color: #6c757d;
}

.empty-state i {
    font-size: 4rem;
    margin-bottom: 1rem;
    opacity: 0.3;
}

/* PWA Install Button */
.install-prompt {
    position: fixed;
    bottom: 1rem;
    left: 50%;
    transform: translateX(-50%);
    z-index: 1050;
    display: none;
}

.install-prompt.show {
    display: block;
}

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

::-webkit-scrollbar-track {
    background: #f1f1f1;
}

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

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