* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #0066FF;
    --secondary-color: #F8F9FA;
    --text-color: #212529;
    --text-secondary: #6C757D;
    --border-color: #DEE2E6;
    --hover-bg: #F1F3F5;
    --success-color: #28A745;
    --warning-color: #FFC107;
    --danger-color: #DC3545;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 4px 16px rgba(0, 0, 0, 0.15);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--secondary-color);
    color: var(--text-color);
    line-height: 1.6;
}

.header {
    background: white;
    border-bottom: 1px solid var(--border-color);
    padding: 0 24px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow);
}

.header-left {
    display: flex;
    align-items: center;
    gap: 16px;
}

.logo {
    height: 40px;
    width: auto;
}

.app-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-color);
}

.export-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

.export-btn:hover {
    background: #0052CC;
}

.container {
    display: flex;
    height: calc(100vh - 64px);
}

.sidebar {
    width: 260px;
    background: white;
    border-right: 1px solid var(--border-color);
    padding: 24px 0;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 24px;
    color: var(--text-color);
    text-decoration: none;
    font-weight: 500;
    transition: all 0.2s;
    border-left: 3px solid transparent;
}

.nav-item:hover {
    background: var(--hover-bg);
}

.nav-item.active {
    background: rgba(0, 102, 255, 0.1);
    border-left-color: var(--primary-color);
    color: var(--primary-color);
}

.main-content {
    flex: 1;
    overflow-y: auto;
    padding: 32px;
}

.section {
    display: none;
}

.section.active {
    display: block;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 32px;
}

.section-header h1 {
    font-size: 32px;
    font-weight: 700;
}

.btn-primary {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-primary:hover {
    background: #0052CC;
}

.kpi-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
    margin-bottom: 40px;
}

.kpi-card {
    background: white;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 24px;
    transition: all 0.2s;
}

.kpi-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

.kpi-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}

.kpi-label {
    font-size: 14px;
    color: var(--text-secondary);
    font-weight: 500;
}

.kpi-trend {
    padding: 4px 10px;
    border-radius: 6px;
    font-size: 13px;
    font-weight: 600;
}

.kpi-trend.up {
    background: rgba(40, 167, 69, 0.1);
    color: var(--success-color);
}

.kpi-trend.down {
    background: rgba(220, 53, 69, 0.1);
    color: var(--danger-color);
}

.kpi-value {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 8px;
}

.kpi-card.positive .kpi-value {
    color: var(--success-color);
}

.kpi-card.negative .kpi-value {
    color: var(--danger-color);
}

.kpi-footer {
    font-size: 13px;
    color: var(--text-secondary);
}

.dashboard-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 24px;
    margin-bottom: 40px;
}

.chart-card,
.transactions-card {
    background: white;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 24px;
}

.chart-card h2,
.transactions-card h2 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 24px;
}

.chart-placeholder {
    width: 100%;
}

.chart-legend {
    display: flex;
    justify-content: center;
    gap: 32px;
    margin-top: 20px;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
}

.legend-color {
    width: 16px;
    height: 16px;
    border-radius: 3px;
}

.transactions-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.transaction-item {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px;
    background: var(--secondary-color);
    border-radius: 8px;
    transition: all 0.2s;
}

.transaction-item:hover {
    background: var(--hover-bg);
}

.transaction-icon {
    width: 40px;
    height: 40px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    flex-shrink: 0;
}

.transaction-item.income .transaction-icon {
    background: var(--success-color);
}

.transaction-item.expense .transaction-icon {
    background: var(--danger-color);
}

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

.transaction-title {
    font-weight: 600;
    font-size: 14px;
    margin-bottom: 4px;
}

.transaction-date {
    font-size: 12px;
    color: var(--text-secondary);
}

.transaction-amount {
    font-weight: 700;
    font-size: 16px;
    white-space: nowrap;
}

.transaction-amount.positive {
    color: var(--success-color);
}

.transaction-amount.negative {
    color: var(--danger-color);
}

.stripe-section {
    background: white;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 24px;
}

.section-title {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
}

.section-title h2 {
    font-size: 20px;
    font-weight: 600;
}

.connected-badge {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 14px;
    background: rgba(40, 167, 69, 0.1);
    color: var(--success-color);
    border-radius: 6px;
    font-size: 13px;
    font-weight: 600;
}

.stripe-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.stripe-stat {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.stat-label {
    font-size: 14px;
    color: var(--text-secondary);
}

.stat-value {
    font-size: 24px;
    font-weight: 700;
}

.table-container {
    background: white;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
}

.data-table thead {
    background: var(--secondary-color);
}

.data-table th {
    padding: 16px;
    text-align: left;
    font-weight: 600;
    font-size: 14px;
    color: var(--text-color);
}

.data-table tbody tr {
    border-bottom: 1px solid var(--border-color);
    transition: all 0.2s;
}

.data-table tbody tr:hover {
    background: var(--hover-bg);
}

.data-table td {
    padding: 16px;
    font-size: 14px;
}

.amount {
    font-weight: 600;
}

.amount.positive {
    color: var(--success-color);
}

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

.status-badge {
    padding: 6px 14px;
    border-radius: 6px;
    font-size: 12px;
    font-weight: 600;
    display: inline-block;
}

.status-badge.paid {
    background: rgba(40, 167, 69, 0.1);
    color: var(--success-color);
}

.status-badge.pending {
    background: rgba(255, 193, 7, 0.1);
    color: var(--warning-color);
}

.btn-text {
    background: transparent;
    border: none;
    color: var(--primary-color);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    padding: 4px 8px;
    border-radius: 4px;
    transition: all 0.2s;
}

.btn-text:hover {
    background: rgba(0, 102, 255, 0.1);
}

.expenses-categories {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 32px;
}

.category-card {
    background: white;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 20px;
    text-align: center;
    transition: all 0.2s;
}

.category-card:hover {
    box-shadow: var(--shadow);
    transform: translateY(-2px);
}

.category-card h3 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 12px;
}

.category-amount {
    font-size: 28px;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 8px;
}

.category-percentage {
    font-size: 13px;
    color: var(--text-secondary);
}

.invoices-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-bottom: 32px;
}

.invoice-stat-card {
    background: white;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 24px;
    text-align: center;
}

.stat-number {
    font-size: 36px;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 8px;
}

.stat-text {
    font-size: 14px;
    color: var(--text-secondary);
}

.bank-accounts {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 24px;
}

.bank-account-card {
    background: white;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 24px;
    transition: all 0.2s;
}

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

.bank-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.bank-name {
    font-size: 18px;
    font-weight: 600;
}

.bank-type {
    font-size: 13px;
    color: var(--text-secondary);
    font-weight: 500;
}

.bank-balance {
    font-size: 36px;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 16px;
}

.bank-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 13px;
    color: var(--text-secondary);
}

.reports-list {
    display: grid;
    gap: 16px;
}

.report-card {
    background: white;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 24px;
    display: flex;
    align-items: center;
    gap: 20px;
    transition: all 0.2s;
}

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

.report-icon {
    width: 64px;
    height: 64px;
    background: rgba(0, 102, 255, 0.1);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-color);
    flex-shrink: 0;
}

.report-info {
    flex: 1;
}

.report-info h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 4px;
}

.report-info p {
    font-size: 14px;
    color: var(--text-secondary);
}

@media (max-width: 1200px) {
    .dashboard-grid {
        grid-template-columns: 1fr;
    }

    .stripe-stats {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .container {
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
        flex-direction: row;
        overflow-x: auto;
        padding: 12px;
    }

    .kpi-grid {
        grid-template-columns: 1fr;
    }

    .expenses-categories {
        grid-template-columns: 1fr;
    }

    .invoices-stats {
        grid-template-columns: 1fr;
    }
}