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    { x: new Date('2025-06-20'), y: 22019.81 },
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    { x: new Date('2025-06-23'), y: 22049.87 },
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    { x: new Date('2025-06-25'), y: 22240.32 },
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    { x: new Date('2025-06-27'), y: 22270.89 },
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    { x: new Date('2025-06-29'), y: 22260.84 },
    { x: new Date('2025-06-30'), y: 22243.56 },
    { x: new Date('2025-07-01'), y: 22258.70 },
    { x: new Date('2025-07-02'), y: 22272.70 },
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    { x: new Date('2025-07-16'), y: 21832.35 },
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    { x: new Date('2025-07-19'), y: 21905.44 },
    { x: new Date('2025-07-20'), y: 21904.23 },
    { x: new Date('2025-07-21'), y: 21878.55 },
    { x: new Date('2025-07-22'), y: 21988.09 },
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    { x: new Date('2025-07-24'), y: 22049.71 },
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    { x: new Date('2025-07-29'), y: 21893.75 },
    { x: new Date('2025-07-30'), y: 21880.18 },
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    { x: new Date('2025-08-01'), y: 21785.60 },
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    { x: new Date('2025-08-08'), y: 21911.08 },
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    { x: new Date('2025-08-11'), y: 21884.02 },
    { x: new Date('2025-08-12'), y: 21841.33 },
    { x: new Date('2025-08-13'), y: 21935.54 },
    { x: new Date('2025-08-14'), y: 21959.52 },
    { x: new Date('2025-08-15'), y: 21836.67 },
    { x: new Date('2025-08-16'), y: 21865.20 },
    { x: new Date('2025-08-18'), y: 21902.41 },
    { x: new Date('2025-08-19'), y: 21872.42 },
    { x: new Date('2025-08-20'), y: 21957.54 },
    { x: new Date('2025-08-21'), y: 21934.75 },
    { x: new Date('2025-08-22'), y: 21917.84 },
    { x: new Date('2025-08-23'), y: 22009.21 },
    { x: new Date('2025-08-24'), y: 21994.38 },
    { x: new Date('2025-08-25'), y: 22040.90 },
    { x: new Date('2025-08-26'), y: 21924.31 },
    { x: new Date('2025-08-27'), y: 21967.16 },
    { x: new Date('2025-08-28'), y: 22098.11 },
    { x: new Date('2025-08-29'), y: 22087.83 },
    { x: new Date('2025-08-30'), y: 22263.84 },
    { x: new Date('2025-08-31'), y: 22242.67 }];

const options = {
    chart: {
        type: 'area',
        height: 300,
        toolbar: { show: false },
        zoom: { enabled: false }
    },
    series: [{ name: '', data: fullData }],
    xaxis: {
        type: 'datetime'
    },
    yaxis: {
        tickAmount: 7,
        labels: {
            formatter: val => `${val.toLocaleString('id-ID')}`,
            offsetX: -17
        }
    },
    grid: {
        padding: {
            left: -10,
            right: 0
        }
    },
    tooltip: {
        x: { format: 'dd MMM yyyy' },
        y: {
            formatter: val => `Rp ${val.toLocaleString('id-ID')}`
        }
    },
    stroke: {
        curve: 'smooth',
        width: 2
    },
    fill: {
        type: 'gradient',
        gradient: {
            shadeIntensity: 1,
            opacityFrom: 0.8,
            opacityTo: 0,
            stops: [0, 90, 100]
        }
    },
    colors: ['#007bff'],
    legend: { show: false },
    dataLabels: { enabled: false }
};

const chart = new ApexCharts(document.querySelector("#chart"), options);
chart.render();

function updateChart(months) {
    const sortedData = [...fullData].sort((a, b) => a.x - b.x);
    const latestDate = sortedData[sortedData.length - 1].x;
    const start = new Date(latestDate);
    start.setMonth(start.getMonth() - months);

    const filtered = fullData.filter(item => item.x >= start && item.x <= latestDate);
    chart.updateSeries([{ name: '', data: filtered }]);
}

document.querySelectorAll('.filter-btn').forEach(btn => {
    btn.addEventListener('click', () => {
        document.querySelectorAll('.filter-btn').forEach(b => b.classList.remove('active'));
        btn.classList.add('active');
        const months = parseInt(btn.dataset.months);
        updateChart(months);
    });
});
updateChart(1);