InvestmentCalculator/index.html at main · jackhallloween21/InvestmentCalculator · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Investment Calculator</title>
    <script src="https://cdn.tailwindcss.com"></script>
    <link rel="icon" href="https://i.imgur.com/jQzq7WM.png" type="image/png">
    <script>
        tailwind.config = {
            darkMode: 'class',
            theme: { extend: { colors: { primary: 'var(--primary)' } } }
        }
    </script>
    <link href="https://fonts.googleapis.com/css2?family=Inter:wght@400;600;700&display=swap" rel="stylesheet">
       <script src="https://cdn.jsdelivr.net/npm/chart.js"></script>
    <style>
        :root { --primary: #6366f1; }
        body { font-family: 'Inter', sans-serif; transition: background 0.4s ease; }

        /* Slider Styling */
        .slider { -webkit-appearance: none; width: 100%; height: 6px; background: #e2e8f0; border-radius: 5px; outline: none; }
        .dark .slider { background: #334155; }
        .slider::-webkit-slider-thumb {
            -webkit-appearance: none; width: 22px; height: 22px;
            background: var(--primary); cursor: pointer; border-radius: 50%;
            border: 4px solid white; box-shadow: 0 4px 6px -1px rgba(0,0,0,0.15);
        }
        .dark .slider::-webkit-slider-thumb { border-color: #0f172a; }

        /* Expanding Theme Picker */
        .theme-pill { max-width: 44px; transition: max-width 0.5s cubic-bezier(0.4, 0, 0.2, 1); overflow: hidden; }
        .theme-pill.expanded { max-width: 320px; }
        .theme-circle { width: 26px; height: 26px; border-radius: 50%; cursor: pointer; flex-shrink: 0; transition: transform 0.2s; }
        .theme-circle:hover { transform: scale(1.1); }

        .tab-active { border-bottom: 3px solid var(--primary); color: var(--primary); font-weight: 700; }
        input::-webkit-outer-spin-button, input::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }

        /* Custom Scrollbar for Tabs on Mobile */
        .no-scrollbar::-webkit-scrollbar { display: none; }
    </style>
</head>
<body class="bg-slate-50 dark:bg-slate-950 p-4 md:p-10 text-slate-900 dark:text-slate-100 min-h-screen">

    <div class="max-w-5xl mx-auto">
        <!-- Header -->
        <div class="flex items-center justify-between mb-8">
            <div>
                <h1 class="text-2xl font-bold tracking-tight">Invest<span style="color: var(--primary)">Logic</span></h1>
                <p class="text-[10px] uppercase tracking-[0.2em] text-slate-400 font-bold hidden md:block">Financial Intelligence</p>
            </div>

            <div class="flex items-center gap-3">
                <!-- Theme Picker -->
                <div id="theme-pill" class="theme-pill flex items-center bg-white dark:bg-slate-900 p-2 rounded-full border border-slate-200 dark:border-slate-800 shadow-sm">
                    <button onclick="document.getElementById('theme-pill').classList.toggle('expanded')" id="current-color-btn" class="theme-circle shadow-md ring-2 ring-white dark:ring-slate-800" style="background: var(--primary)"></button>
                    <div class="flex gap-2.5 ml-4 mr-2" id="theme-options"></div>
                </div>

                <!-- Dark Mode Toggle with Sun/Moon Icons -->
                <button onclick="toggleDark()" class="p-2.5 rounded-full bg-white dark:bg-slate-900 border border-slate-200 dark:border-slate-800 shadow-sm hover:bg-slate-100 dark:hover:bg-slate-800 transition-all">
                    <span id="sun-icon" class="hidden text-lg">☀️</span>
                    <span id="moon-icon" class="text-lg">🌙</span>
                </button>
            </div>
        </div>

        <!-- Main Card -->
        <div class="bg-white dark:bg-slate-900 rounded-[2.5rem] shadow-2xl shadow-slate-200 dark:shadow-none overflow-hidden border border-slate-100 dark:border-slate-800">
            <!-- Navigation Tabs -->
            <div class="flex px-8 pt-6 border-b border-slate-100 dark:border-slate-800 gap-8 overflow-x-auto no-scrollbar">
                <button onclick="switchTab('sip')" id="tab-sip" class="pb-4 text-xs uppercase tracking-widest font-bold text-slate-400 tab-active">SIP</button>
                <button onclick="switchTab('lumpsum')" id="tab-lumpsum" class="pb-4 text-xs uppercase tracking-widest font-bold text-slate-400">Lumpsum</button>
                <button onclick="switchTab('swp')" id="tab-swp" class="pb-4 text-xs uppercase tracking-widest font-bold text-slate-400">SWP</button>
            </div>

            <div class="p-6 md:p-12 grid grid-cols-1 lg:grid-cols-2 gap-10 lg:gap-20">
                <!-- Inputs -->
                <div class="space-y-8">
                    <h2 id="calc-title" class="text-xl font-bold tracking-tight text-slate-700 dark:text-slate-200 uppercase text-xs">SIP Calculator</h2>
                    <div id="inputs-container" class="space-y-8"></div>
                </div>

                <!-- Results Section (Mobile Optimized) -->
                <div class="bg-slate-50/50 dark:bg-slate-800/40 rounded-[2.5rem] p-6 md:p-10 border border-slate-100 dark:border-slate-800 flex flex-col items-center">
                    <div class="w-full max-w-[240px] mb-10">
                        <canvas id="resultChart"></canvas>
                    </div>

                    <div class="w-full space-y-4">
                        <!-- Result 1 -->
                        <div class="bg-white dark:bg-slate-900 p-5 rounded-2xl border border-slate-100 dark:border-slate-800 shadow-sm">
                            <p class="text-[10px] font-bold text-slate-400 uppercase tracking-widest mb-1" id="label-1">Invested</p>
                            <p class="text-xl md:text-2xl font-bold break-all leading-tight text-slate-800 dark:text-slate-100" id="res-invested">₹0</p>
                        </div>

                        <!-- Result 2 -->
                        <div class="bg-white dark:bg-slate-900 p-5 rounded-2xl border border-slate-100 dark:border-slate-800 shadow-sm">
                            <p class="text-[10px] font-bold text-slate-400 uppercase tracking-widest mb-1" id="label-2">Returns</p>
                            <p class="text-xl md:text-2xl font-bold break-all leading-tight" style="color: var(--primary)" id="res-returns">₹0</p>
                        </div>

                        <!-- Main Total -->
                        <div id="total-container" class="p-6 rounded-2xl shadow-xl transition-all duration-500 text-white" style="background: var(--primary)">
                            <p class="text-[10px] font-bold opacity-80 uppercase tracking-widest mb-1">Total Value</p>
                            <p class="text-2xl md:text-3xl font-bold break-all leading-tight" id="res-total">₹0</p>
                        </div>
                    </div>
                </div>
            </div>
        </div>
    </div>

    <script>
        let currentTab = 'sip';
        let chart = null;
        let themeColor = localStorage.getItem('themeColor') || '#6366f1';

        const configs = {
            sip: { title: "SIP Plan", labels: ["Total Invested", "Est. Returns"], inputs: [
                { id: 'amount', label: 'Monthly Investment', min: 500, max: 1000000, step: 500, val: 25000, suffix: '₹' },
                { id: 'rate', label: 'Expected Return Rate', min: 1, max: 50, step: 0.1, val: 12, suffix: '%' },
                { id: 'years', label: 'Time Period', min: 1, max: 80, step: 1, val: 10, suffix: 'Yr' }
            ]},
            lumpsum: { title: "Lumpsum Plan", labels: ["Principal Amount", "Est. Returns"], inputs: [
                { id: 'amount', label: 'One-time Investment', min: 5000, max: 10000000, step: 5000, val: 1000000, suffix: '₹' },
                { id: 'rate', label: 'Expected Return Rate', min: 1, max: 50, step: 0.1, val: 12, suffix: '%' },
                { id: 'years', label: 'Time Period', min: 1, max: 80, step: 1, val: 10, suffix: 'Yr' }
            ]},
            swp: { title: "Withdrawal Plan", labels: ["Total Withdrawal", "Final Balance"], inputs: [
                { id: 'amount', label: 'Total Investment', min: 100000, max: 50000000, step: 10000, val: 1000000, suffix: '₹' },
                { id: 'withdrawal', label: 'Monthly Withdrawal', min: 1000, max: 500000, step: 500, val: 10000, suffix: '₹' },
                { id: 'rate', label: 'Expected Returns', min: 1, max: 50, step: 0.1, val: 15, suffix: '%' },
                { id: 'years', label: 'Tenure', min: 1, max: 80, step: 1, val: 5, suffix: 'Yr' }
            ]}
        };

        function updateTheme(color) {
            themeColor = color;
            document.documentElement.style.setProperty('--primary', color);
            document.getElementById('current-color-btn').style.background = color;
            localStorage.setItem('themeColor', color);
            document.getElementById('theme-pill').classList.remove('expanded');
            if(chart) updateChart(null, null, true);
        }

        function toggleDark() {
            const isDark = document.documentElement.classList.toggle('dark');
            localStorage.setItem('theme', isDark ? 'dark' : 'light');
            updateThemeIcons(isDark);
            if(chart) updateChart(null, null, true);
        }

        function updateThemeIcons(isDark) {
            document.getElementById('sun-icon').classList.toggle('hidden', !isDark);
            document.getElementById('moon-icon').classList.toggle('hidden', isDark);
        }

        function switchTab(tab) {
            currentTab = tab;
            document.querySelectorAll('button[id^="tab-"]').forEach(b => b.classList.remove('tab-active'));
            document.getElementById(`tab-${tab}`).classList.add('tab-active');
            document.getElementById('total-container').style.display = (tab === 'swp') ? 'none' : 'block';
            renderInputs();
            calculate();
        }

        function renderInputs() {
            const container = document.getElementById('inputs-container');
            const config = configs[currentTab];
            document.getElementById('calc-title').innerText = config.title;
            document.getElementById('label-1').innerText = config.labels[0];
            document.getElementById('label-2').innerText = config.labels[1];

            container.innerHTML = config.inputs.map(input => `
                <div class="space-y-4">
                    <div class="flex justify-between items-center">
                        <label class="text-[10px] font-bold text-slate-400 uppercase tracking-widest">${input.label}</label>
                        <div class="bg-slate-100 dark:bg-slate-800 px-3 py-1.5 rounded-xl flex items-center border border-slate-200 dark:border-slate-700 min-w-[120px] justify-end">
                            <input type="number" id="num-${input.id}" value="${input.val}"
                                class="w-full text-right font-bold bg-transparent outline-none text-lg" style="color: var(--primary)"
                                oninput="sync('${input.id}', false)">
                            <span class="ml-2 text-[10px] font-bold text-slate-400 uppercase">${input.suffix}</span>
                        </div>
                    </div>
                    <input type="range" id="range-${input.id}" min="${input.min}" max="${input.max}" step="${input.step}" value="${input.val}"
                        class="slider" oninput="sync('${input.id}', true)">
                </div>
            `).join('');
        }

        function sync(id, isSlider) {
            const val = document.getElementById(isSlider ? `range-${id}` : `num-${id}`).value;
            document.getElementById(isSlider ? `num-${id}` : `range-${id}`).value = val;
            calculate();
        }

        function calculate() {
            const P = parseFloat(document.getElementById('num-amount').value) || 0;
            const r = (parseFloat(document.getElementById('num-rate').value) || 0) / 100;
            const n = parseFloat(document.getElementById('num-years').value) || 0;
            let v1 = 0, v2 = 0, total = 0;

            if (currentTab === 'sip') {
                const i = r / 12;
                total = P * ((Math.pow(1 + i, n * 12) - 1) / i) * (1 + i);
                v1 = P * n * 12;
                v2 = total - v1;
            } else if (currentTab === 'lumpsum') {
                total = P * Math.pow(1 + r, n);
                v1 = P;
                v2 = total - v1;
            } else if (currentTab === 'swp') {
                const W = parseFloat(document.getElementById('num-withdrawal').value) || 0;
                const i = r / 12;
                v2 = P * Math.pow(1 + i, n * 12) - (W * (Math.pow(1 + i, n * 12) - 1) / i);
                v1 = W * n * 12;
                total = Math.max(0, v2);
                v2 = total;
            }
            updateUI(v1, v2, total);
        }

        function updateUI(v1, v2, total) {
            const fmt = (n) => "₹" + Math.round(n).toLocaleString('en-IN');
            document.getElementById('res-invested').innerText = fmt(v1);
            document.getElementById('res-returns').innerText = fmt(v2);
            document.getElementById('res-total').innerText = fmt(total);

            // Dynamic Font Scaling for very long numbers
            ['res-invested', 'res-returns', 'res-total'].forEach(id => {
                const el = document.getElementById(id);
                const len = el.innerText.length;
                if (len > 15) el.className = "text-lg font-bold break-all leading-tight";
                else if (len > 12) el.className = "text-xl font-bold break-all leading-tight";
                else el.className = (id === 'res-total') ? "text-2xl md:text-3xl font-bold break-all leading-tight" : "text-xl md:text-2xl font-bold break-all leading-tight";
            });

            updateChart(v1, v2);
        }

        let lV1 = 0, lV2 = 0;
        function updateChart(v1, v2, force = false) {
            if (v1 !== null) lV1 = v1; if (v2 !== null) lV2 = v2;
            const isDark = document.documentElement.classList.contains('dark');
            const data = {
                labels: configs[currentTab].labels,
                datasets: [{
                    data: [lV1, lV2],
                    backgroundColor: [isDark ? '#1e293b' : '#f1f5f9', themeColor],
                    borderWidth: 0,
                    hoverOffset: 0
                }]
            };
            if (chart) { chart.data = data; chart.update(force ? 'default' : 'none'); }
            else { chart = new Chart(document.getElementById('resultChart'), { type: 'doughnut', data: data, options: { cutout: '80%', plugins: { legend: { display: false } } } }); }
        }

        // Init
        const presets = ['#6366f1', '#0ea5e9', '#10b981', '#f59e0b', '#ef4444', '#ec4899'];
        document.getElementById('theme-options').innerHTML = presets.map(c => `<div class="theme-circle" style="background:${c}" onclick="updateTheme('${c}')"></div>`).join('');

        if (localStorage.getItem('theme') === 'dark') {
            document.documentElement.classList.add('dark');
            updateThemeIcons(true);
        }

        updateTheme(themeColor);
        switchTab('sip');

        // Auto-close theme picker when clicking outside
        window.addEventListener('click', (e) => {
            if (!document.getElementById('theme-pill').contains(e.target)) {
                document.getElementById('theme-pill').classList.remove('expanded');
            }
        });
    </script>
</body>
</html>