/* CSS Reset and Base Styles */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --primary-color: #4F46E5;
    --primary-hover: #4338CA;
    --secondary-color: #10B981;
    --danger-color: #EF4444;
    --warning-color: #F59E0B;
    --background-color: #F3F4F6;
    --card-background: #FFFFFF;
    --text-primary: #1F2937;
    --text-secondary: #6B7280;
    --text-muted: #9CA3AF;
    --border-color: #E5E7EB;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --transition: all 0.2s ease-in-out;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: var(--background-color);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

.app-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Header Styles */
.header {
    background: linear-gradient(135deg, var(--primary-color), #7C3AED);
    color: white;
    padding: 2rem 1rem;
    text-align: center;
}

.logo-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    margin-bottom: 0.5rem;
}

.logo {
    width: 48px;
    height: 48px;
    object-fit: contain;
}

.header h1 {
    font-size: 2rem;
    font-weight: 700;
}

.tagline {
    opacity: 0.9;
    font-size: 1rem;
}

/* Main Content */
.main-content {
    flex: 1;
    padding: 1.5rem;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

/* Card Styles */
.card {
    background: var(--card-background);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}

.card h2 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.section-header h2 {
    margin-bottom: 0;
}

/* Budget Input Section */
.budget-input-group {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}

.budget-input-group .currency-symbol {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.budget-input-group input {
    flex: 1;
    min-width: 150px;
    padding: 0.75rem 1rem;
    font-size: 1.25rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    transition: var(--transition);
}

.budget-input-group input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

/* Budget Summary */
.budget-summary {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
    padding: 1rem;
    background: var(--background-color);
    border-radius: var(--radius-md);
}

.summary-item {
    text-align: center;
}

.summary-label {
    display: block;
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 0.25rem;
}

.summary-value {
    display: block;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

#displayRemaining.positive {
    color: var(--secondary-color);
}

#displayRemaining.negative {
    color: var(--danger-color);
}

/* Button Styles */
.btn {
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    font-weight: 500;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.btn-primary {
    background: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background: var(--primary-hover);
}

.btn-secondary {
    background: var(--secondary-color);
    color: white;
}

.btn-secondary:hover {
    background: #059669;
}

.btn-danger {
    background: var(--danger-color);
    color: white;
}

.btn-danger:hover {
    background: #DC2626;
}

.btn-cancel {
    background: var(--text-muted);
    color: white;
}

.btn-cancel:hover {
    background: var(--text-secondary);
}

.btn-small {
    padding: 0.375rem 0.75rem;
    font-size: 0.875rem;
}

/* Categories List */
.categories-list {
    display: grid;
    gap: 1rem;
}

.category-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    background: var(--background-color);
    border-radius: var(--radius-md);
    border-left: 4px solid var(--primary-color);
}

.category-color {
    width: 16px;
    height: 16px;
    border-radius: 50%;
    flex-shrink: 0;
}

.category-info {
    flex: 1;
    min-width: 0;
}

.category-name {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.category-details {
    display: flex;
    gap: 1rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
    flex-wrap: wrap;
}

.category-progress {
    flex: 1;
    min-width: 100px;
    max-width: 200px;
}

.progress-bar {
    height: 8px;
    background: var(--border-color);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 0.25rem;
}

.progress-fill {
    height: 100%;
    background: var(--primary-color);
    transition: width 0.3s ease;
}

.progress-text {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.category-actions {
    display: flex;
    gap: 0.5rem;
}

.category-actions button {
    padding: 0.5rem;
    background: transparent;
    border: none;
    cursor: pointer;
    color: var(--text-secondary);
    transition: var(--transition);
    border-radius: var(--radius-sm);
}

.category-actions button:hover {
    background: var(--border-color);
    color: var(--text-primary);
}

.category-actions .delete-btn:hover {
    color: var(--danger-color);
}

/* Modal Styles */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    align-items: center;
    justify-content: center;
    padding: 1rem;
}

.modal.active {
    display: flex;
}

.modal-content {
    background: var(--card-background);
    border-radius: var(--radius-lg);
    width: 100%;
    max-width: 450px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.modal-header h3 {
    font-size: 1.125rem;
    font-weight: 600;
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-secondary);
    transition: var(--transition);
}

.modal-close:hover {
    color: var(--text-primary);
}

.modal-body {
    padding: 1.5rem;
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 0.75rem;
    padding: 1rem 1.5rem;
    border-top: 1px solid var(--border-color);
}

/* Form Styles */
.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 0.75rem 1rem;
    font-size: 1rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    transition: var(--transition);
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.form-group input[type="color"] {
    padding: 0.25rem;
    height: 48px;
    cursor: pointer;
}

.percentage-input,
.amount-input {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.percentage-input input,
.amount-input input {
    flex: 1;
}

.percentage-input span,
.amount-input .currency-symbol {
    font-weight: 600;
    color: var(--text-secondary);
}

/* Visualization Section */
.chart-container {
    display: flex;
    flex-wrap: wrap;
    gap: 2rem;
    align-items: center;
    justify-content: center;
    margin-bottom: 2rem;
}

.pie-chart {
    width: 200px;
    height: 200px;
    border-radius: 50%;
    background: conic-gradient(var(--border-color) 0deg 360deg);
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}

.pie-chart-inner {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    background: var(--card-background);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-sm);
}

.pie-chart-percentage {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
}

.pie-chart-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.chart-legend {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.legend-color {
    width: 16px;
    height: 16px;
    border-radius: 4px;
    flex-shrink: 0;
}

.legend-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.legend-value {
    font-weight: 600;
    color: var(--text-primary);
    margin-left: auto;
}

/* Bar Chart */
.bar-chart-container h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

.bar-chart {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.bar-item {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.bar-label {
    width: 100px;
    font-size: 0.875rem;
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.bar-track {
    flex: 1;
    height: 24px;
    background: var(--background-color);
    border-radius: var(--radius-sm);
    overflow: hidden;
    position: relative;
}

.bar-fill {
    height: 100%;
    transition: width 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: flex-end;
    padding-right: 0.5rem;
    min-width: fit-content;
}

.bar-fill span {
    font-size: 0.75rem;
    font-weight: 600;
    color: white;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
}

/* Spending Section */
.spending-summary {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.spending-card {
    padding: 1rem;
    border-radius: var(--radius-md);
    border-left: 4px solid var(--primary-color);
    background: var(--background-color);
}

.spending-card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 0.75rem;
}

.spending-card-title {
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--text-primary);
}

.spending-card-budget {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.spending-card-amount {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.spending-card-progress {
    height: 6px;
    background: var(--border-color);
    border-radius: 3px;
    overflow: hidden;
}

.spending-card-fill {
    height: 100%;
    transition: width 0.3s ease;
}

.spending-card-fill.warning {
    background: var(--warning-color);
}

.spending-card-fill.danger {
    background: var(--danger-color);
}

.spending-card-fill.safe {
    background: var(--secondary-color);
}

.spending-card-status {
    font-size: 0.75rem;
    margin-top: 0.5rem;
    color: var(--text-secondary);
}

/* Expenses Table */
.expenses-list h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

.expenses-table-container {
    overflow-x: auto;
}

.expenses-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.875rem;
}

.expenses-table th,
.expenses-table td {
    padding: 0.75rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.expenses-table th {
    font-weight: 600;
    color: var(--text-secondary);
    background: var(--background-color);
}

.expenses-table tr:hover {
    background: var(--background-color);
}

.expenses-table .amount {
    font-weight: 600;
    color: var(--danger-color);
}

.no-expenses {
    text-align: center;
    color: var(--text-muted);
    padding: 2rem;
    font-style: italic;
}

.no-expenses.hidden {
    display: none;
}

/* Footer Styles */
.footer {
    background: var(--text-primary);
    color: white;
    text-align: center;
    padding: 1.5rem;
    margin-top: auto;
}

.footer a {
    color: #93C5FD;
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
}

.footer a:hover {
    color: white;
    text-decoration: underline;
}

/* Responsive Design */
@media (max-width: 768px) {
    .header h1 {
        font-size: 1.5rem;
    }

    .main-content {
        padding: 1rem;
    }

    .card {
        padding: 1rem;
    }

    .budget-input-group {
        flex-direction: column;
        align-items: stretch;
    }

    .budget-input-group input {
        width: 100%;
    }

    .category-item {
        flex-direction: column;
        align-items: flex-start;
    }

    .category-progress {
        width: 100%;
        max-width: none;
    }

    .category-actions {
        width: 100%;
        justify-content: flex-end;
    }

    .chart-container {
        flex-direction: column;
    }

    .chart-legend {
        width: 100%;
    }

    .bar-item {
        flex-direction: column;
        align-items: flex-start;
    }

    .bar-label {
        width: 100%;
    }

    .bar-track {
        width: 100%;
    }

    .spending-summary {
        grid-template-columns: 1fr;
    }

    .modal-footer {
        flex-direction: column;
    }

    .modal-footer .btn {
        width: 100%;
    }
}

@media (max-width: 480px) {
    .section-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .section-header .btn {
        width: 100%;
    }

    .expenses-table th,
    .expenses-table td {
        padding: 0.5rem;
        font-size: 0.75rem;
    }
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 2rem;
    color: var(--text-muted);
}

.empty-state-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.empty-state-text {
    font-size: 1rem;
}

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

.fade-in {
    animation: fadeIn 0.3s ease-out;
}

/* Utility Classes */
.hidden {
    display: none !important;
}

.text-center {
    text-align: center;
}

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }