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    <title>Precision Converter | Elegant Unit Conversion Tool</title>
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</head>
<body>
    <div class="container">
        <header>
            <h1>Precision Converter</h1>
            <p class="subtitle">Elegant unit conversions with laser accuracy</p>
        </header>

        <div class="converter-card">
            <div class="category-tabs">
                <button class="category-tab active" data-category="length">Length</button>
                <button class="category-tab" data-category="temperature">Temperature</button>
                <button class="category-tab" data-category="weight">Weight & Mass</button>
                <button class="category-tab" data-category="volume">Volume</button>
                <button class="category-tab" data-category="area">Area</button>
                <button class="category-tab" data-category="speed">Speed</button>
                <button class="category-tab" data-category="time">Time</button>
                <button class="category-tab" data-category="data">Digital Data</button>
            </div>

            <div class="converter-content">
                <!-- Length Conversion Panel -->
                <div class="conversion-panel active" id="length-panel">
                    <div class="two-columns">
                        <div class="input-group">
                            <label for="length-value">Enter Value:</label>
                            <input type="number" id="length-value" value="1" step="any">
                        </div>
                        <div class="input-group">
                            <label for="length-unit">From Unit:</label>
                            <select id="length-unit">
                                <option value="meters">Meters (m)</option>
                                <option value="kilometers">Kilometers (km)</option>
                                <option value="centimeters">Centimeters (cm)</option>
                                <option value="millimeters">Millimeters (mm)</option>
                                <option value="miles">Miles (mi)</option>
                                <option value="yards">Yards (yd)</option>
                                <option value="feet" selected>Feet (ft)</option>
                                <option value="inches">Inches (in)</option>
                                <option value="nautical-miles">Nautical Miles (nmi)</option>
                            </select>
                        </div>
                    </div>
                    <div class="results">
                        <h3 class="results-title">Conversion Results</h3>
                        <div id="length-results"></div>
                    </div>
                </div>

                <!-- Temperature Conversion Panel -->
                <div class="conversion-panel" id="temperature-panel">
                    <div class="two-columns">
                        <div class="input-group">
                            <label for="temperature-value">Enter Value:</label>
                            <input type="number" id="temperature-value" value="32" step="any">
                        </div>
                        <div class="input-group">
                            <label for="temperature-unit">From Unit:</label>
                            <select id="temperature-unit">
                                <option value="celsius">Celsius (°C)</option>
                                <option value="fahrenheit" selected>Fahrenheit (°F)</option>
                                <option value="kelvin">Kelvin (K)</option>
                                <option value="rankine">Rankine (°R)</option>
                            </select>
                        </div>
                    </div>
                    <div class="results">
                        <h3 class="results-title">Conversion Results</h3>
                        <div id="temperature-results"></div>
                    </div>
                </div>

                <!-- Weight Conversion Panel -->
                <div class="conversion-panel" id="weight-panel">
                    <div class="two-columns">
                        <div class="input-group">
                            <label for="weight-value">Enter Value:</label>
                            <input type="number" id="weight-value" value="1" step="any">
                        </div>
                        <div class="input-group">
                            <label for="weight-unit">From Unit:</label>
                            <select id="weight-unit">
                                <option value="kilograms">Kilograms (kg)</option>
                                <option value="grams">Grams (g)</option>
                                <option value="pounds" selected>Pounds (lb)</option>
                                <option value="ounces">Ounces (oz)</option>
                                <option value="stones">Stones (st)</option>
                                <option value="metric-tons">Metric Tons (t)</option>
                                <option value="us-tons">US Tons</option>
                                <option value="imperial-tons">Imperial Tons</option>
                            </select>
                        </div>
                    </div>
                    <div class="results">
                        <h3 class="results-title">Conversion Results</h3>
                        <div id="weight-results"></div>
                    </div>
                </div>

                <!-- Volume Conversion Panel -->
                <div class="conversion-panel" id="volume-panel">
                    <div class="two-columns">
                        <div class="input-group">
                            <label for="volume-value">Enter Value:</label>
                            <input type="number" id="volume-value" value="1" step="any">
                        </div>
                        <div class="input-group">
                            <label for="volume-unit">From Unit:</label>
                            <select id="volume-unit">
                                <option value="liters">Liters (L)</option>
                                <option value="milliliters">Milliliters (mL)</option>
                                <option value="cubic-meters">Cubic Meters (m³)</option>
                                <option value="gallons-us" selected>Gallons (US)</option>
                                <option value="gallons-uk">Gallons (UK)</option>
                                <option value="quarts">Quarts (qt)</option>
                                <option value="pints">Pints (pt)</option>
                                <option value="cups">Cups (c)</option>
                                <option value="fluid-ounces">Fluid Ounces (fl oz)</option>
                                <option value="tablespoons">Tablespoons (tbsp)</option>
                                <option value="teaspoons">Teaspoons (tsp)</option>
                            </select>
                        </div>
                    </div>
                    <div class="results">
                        <h3 class="results-title">Conversion Results</h3>
                        <div id="volume-results"></div>
                    </div>
                </div>

                <!-- Area Conversion Panel -->
                <div class="conversion-panel" id="area-panel">
                    <div class="two-columns">
                        <div class="input-group">
                            <label for="area-value">Enter Value:</label>
                            <input type="number" id="area-value" value="1" step="any">
                        </div>
                        <div class="input-group">
                            <label for="area-unit">From Unit:</label>
                            <select id="area-unit">
                                <option value="square-meters">Square Meters (m²)</option>
                                <option value="square-kilometers">Square Kilometers (km²)</option>
                                <option value="square-centimeters">Square Centimeters (cm²)</option>
                                <option value="square-miles">Square Miles (mi²)</option>
                                <option value="square-yards">Square Yards (yd²)</option>
                                <option value="square-feet" selected>Square Feet (ft²)</option>
                                <option value="square-inches">Square Inches (in²)</option>
                                <option value="hectares">Hectares (ha)</option>
                                <option value="acres">Acres</option>
                            </select>
                        </div>
                    </div>
                    <div class="results">
                        <h3 class="results-title">Conversion Results</h3>
                        <div id="area-results"></div>
                    </div>
                </div>
                
                <!-- Speed Conversion Panel -->
                <div class="conversion-panel" id="speed-panel">
                    <div class="two-columns">
                        <div class="input-group">
                            <label for="speed-value">Enter Value:</label>
                            <input type="number" id="speed-value" value="1" step="any">
                        </div>
                        <div class="input-group">
                            <label for="speed-unit">From Unit:</label>
                            <select id="speed-unit">
                                <option value="meters-per-second">Meters per second (m/s)</option>
                                <option value="kilometers-per-hour" selected>Kilometers per hour (km/h)</option>
                                <option value="miles-per-hour">Miles per hour (mph)</option>
                                <option value="feet-per-second">Feet per second (ft/s)</option>
                                <option value="knots">Knots (kn)</option>
                            </select>
                        </div>
                    </div>
                    <div class="results">
                        <h3 class="results-title">Conversion Results</h3>
                        <div id="speed-results"></div>
                    </div>
                </div>
                
                <!-- Time Conversion Panel -->
                <div class="conversion-panel" id="time-panel">
                    <div class="two-columns">
                        <div class="input-group">
                            <label for="time-value">Enter Value:</label>
                            <input type="number" id="time-value" value="1" step="any">
                        </div>
                        <div class="input-group">
                            <label for="time-unit">From Unit:</label>
                            <select id="time-unit">
                                <option value="seconds">Seconds (s)</option>
                                <option value="minutes" selected>Minutes (min)</option>
                                <option value="hours">Hours (h)</option>
                                <option value="days">Days (d)</option>
                                <option value="weeks">Weeks</option>
                                <option value="months">Months</option>
                                <option value="years">Years</option>
                            </select>
                        </div>
                    </div>
                    <div class="results">
                        <h3 class="results-title">Conversion Results</h3>
                        <div id="time-results"></div>
                    </div>
                </div>
                
                <!-- Digital Data Conversion Panel -->
                <div class="conversion-panel" id="data-panel">
                    <div class="two-columns">
                        <div class="input-group">
                            <label for="data-value">Enter Value:</label>
                            <input type="number" id="data-value" value="1" step="any">
                        </div>
                        <div class="input-group">
                            <label for="data-unit">From Unit:</label>
                            <select id="data-unit">
                                <option value="bits">Bits (b)</option>
                                <option value="bytes" selected>Bytes (B)</option>
                                <option value="kilobytes">Kilobytes (KB)</option>
                                <option value="megabytes">Megabytes (MB)</option>
                                <option value="gigabytes">Gigabytes (GB)</option>
                                <option value="terabytes">Terabytes (TB)</option>
                                <option value="petabytes">Petabytes (PB)</option>
                                <option value="kibibytes">Kibibytes (KiB)</option>
                                <option value="mebibytes">Mebibytes (MiB)</option>
                                <option value="gibibytes">Gibibytes (GiB)</option>
                            </select>
                        </div>
                    </div>
                    <div class="results">
                        <h3 class="results-title">Conversion Results</h3>
                        <div id="data-results"></div>
                    </div>
                </div>
            </div>
        </div>
    </div>

    <footer>
        <p>Precision Converter | © <span id="year"></span> All rights reserved</p>
    </footer>

    <script>
    // Conversion data and utility functions
    const conversions = {
        // Length conversion factors (to base unit: meters)
        length: {
            base: 'meters',
            units: {
                meters: { factor: 1, display: 'Meters (m)', precision: 3 },
                kilometers: { factor: 1000, display: 'Kilometers (km)', precision: 5 },
                centimeters: { factor: 0.01, display: 'Centimeters (cm)', precision: 2 },
                millimeters: { factor: 0.001, display: 'Millimeters (mm)', precision: 1 },
                miles: { factor: 1609.344, display: 'Miles (mi)', precision: 5 },
                yards: { factor: 0.9144, display: 'Yards (yd)', precision: 3 },
                feet: { factor: 0.3048, display: 'Feet (ft)', precision: 3 },
                inches: { factor: 0.0254, display: 'Inches (in)', precision: 2 },
                'nautical-miles': { factor: 1852, display: 'Nautical Miles (nmi)', precision: 5 }
            }
        },
        
        // Temperature conversions (requires special handling for conversions)
        temperature: {
            units: {
                celsius: { display: 'Celsius (°C)', precision: 2 },
                fahrenheit: { display: 'Fahrenheit (°F)', precision: 2 },
                kelvin: { display: 'Kelvin (K)', precision: 2 },
                rankine: { display: 'Rankine (°R)', precision: 2 }
            },
            // Special conversion functions for temperature
            convert: function(value, fromUnit, toUnit) {
                // First convert to Kelvin (base unit for temperature)
                let kelvin;
                
                switch(fromUnit) {
                    case 'celsius':
                        kelvin = value + 273.15;
                        break;
                    case 'fahrenheit':
                        kelvin = (value - 32) * 5/9 + 273.15;
                        break;
                    case 'kelvin':
                        kelvin = value;
                        break;
                    case 'rankine':
                        kelvin = value * 5/9;
                        break;
                }
                
                // Then convert from Kelvin to target unit
                switch(toUnit) {
                    case 'celsius':
                        return kelvin - 273.15;
                    case 'fahrenheit':
                        return (kelvin - 273.15) * 9/5 + 32;
                    case 'kelvin':
                        return kelvin;
                    case 'rankine':
                        return kelvin * 9/5;
                }
            }
        },
        
        // Weight conversion factors (to base unit: kilograms)
        weight: {
            base: 'kilograms',
            units: {
                kilograms: { factor: 1, display: 'Kilograms (kg)', precision: 3 },
                grams: { factor: 0.001, display: 'Grams (g)', precision: 2 },
                pounds: { factor: 0.45359237, display: 'Pounds (lb)', precision: 3 },
                ounces: { factor: 0.0283495, display: 'Ounces (oz)', precision: 3 },
                stones: { factor: 6.35029, display: 'Stones (st)', precision: 3 },
                'metric-tons': { factor: 1000, display: 'Metric Tons (t)', precision: 5 },
                'us-tons': { factor: 907.18474, display: 'US Tons', precision: 4 },
                'imperial-tons': { factor: 1016.0469, display: 'Imperial Tons', precision: 4 }
            }
        },
        
        // Volume conversion factors (to base unit: liters)
        volume: {
            base: 'liters',
            units: {
                liters: { factor: 1, display: 'Liters (L)', precision: 3 },
                milliliters: { factor: 0.001, display: 'Milliliters (mL)', precision: 2 },
                'cubic-meters': { factor: 1000, display: 'Cubic Meters (m³)', precision: 5 },
                'gallons-us': { factor: 3.78541, display: 'Gallons (US)', precision: 3 },
                'gallons-uk': { factor: 4.54609, display: 'Gallons (UK)', precision: 3 },
                quarts: { factor: 0.946353, display: 'Quarts (qt)', precision: 3 },
                pints: { factor: 0.473176, display: 'Pints (pt)', precision: 3 },
                cups: { factor: 0.236588, display: 'Cups (c)', precision: 3 },
                'fluid-ounces': { factor: 0.0295735, display: 'Fluid Ounces (fl oz)', precision: 3 },
                tablespoons: { factor: 0.0147868, display: 'Tablespoons (tbsp)', precision: 3 },
                teaspoons: { factor: 0.00492892, display: 'Teaspoons (tsp)', precision: 4 }
            }
        },
        
        // Area conversion factors (to base unit: square meters)
        area: {
            base: 'square-meters',
            units: {
                'square-meters': { factor: 1, display: 'Square Meters (m²)', precision: 3 },
                'square-kilometers': { factor: 1000000, display: 'Square Kilometers (km²)', precision: 6 },
                'square-centimeters': { factor: 0.0001, display: 'Square Centimeters (cm²)', precision: 2 },
                'square-miles': { factor: 2589988.11, display: 'Square Miles (mi²)', precision: 6 },
                'square-yards': { factor: 0.836127, display: 'Square Yards (yd²)', precision: 3 },
                'square-feet': { factor: 0.092903, display: 'Square Feet (ft²)', precision: 3 },
                'square-inches': { factor: 0.00064516, display: 'Square Inches (in²)', precision: 2 },
                'hectares': { factor: 10000, display: 'Hectares (ha)', precision: 4 },
                'acres': { factor: 4046.86, display: 'Acres', precision: 4 }
            }
        },
        
        // Speed conversion factors (to base unit: meters per second)
        speed: {
            base: 'meters-per-second',
            units: {
                'meters-per-second': { factor: 1, display: 'Meters per second (m/s)', precision: 3 },
                'kilometers-per-hour': { factor: 0.277778, display: 'Kilometers per hour (km/h)', precision: 3 },
                'miles-per-hour': { factor: 0.44704, display: 'Miles per hour (mph)', precision: 3 },
                'feet-per-second': { factor: 0.3048, display: 'Feet per second (ft/s)', precision: 3 },
                'knots': { factor: 0.514444, display: 'Knots (kn)', precision: 3 }
            }
        },
        
        // Time conversion factors (to base unit: seconds)
        time: {
            base: 'seconds',
            units: {
                'seconds': { factor: 1, display: 'Seconds (s)', precision: 2 },
                'minutes': { factor: 60, display: 'Minutes (min)', precision: 2 },
                'hours': { factor: 3600, display: 'Hours (h)', precision: 2 },
                'days': { factor: 86400, display: 'Days (d)', precision: 2 },
                'weeks': { factor: 604800, display: 'Weeks', precision: 2 },
                'months': { factor: 2628000, display: 'Months (30 days)', precision: 2 },
                'years': { factor: 31536000, display: 'Years (365 days)', precision: 2 }
            }
        },
        
        // Digital data conversion factors (to base unit: bytes)
        data: {
            base: 'bytes',
            units: {
                'bits': { factor: 0.125, display: 'Bits (b)', precision: 2 },
                'bytes': { factor: 1, display: 'Bytes (B)', precision: 2 },
                'kilobytes': { factor: 1024, display: 'Kilobytes (KB)', precision: 2 },
                'megabytes': { factor: 1048576, display: 'Megabytes (MB)', precision: 2 },
                'gigabytes': { factor: 1073741824, display: 'Gigabytes (GB)', precision: 2 },
                'terabytes': { factor: 1099511627776, display: 'Terabytes (TB)', precision: 2 },
                'petabytes': { factor: 1125899906842624, display: 'Petabytes (PB)', precision: 2 },
                'kibibytes': { factor: 1024, display: 'Kibibytes (KiB)', precision: 2 },
                'mebibytes': { factor: 1048576, display: 'Mebibytes (MiB)', precision: 2 },
                'gibibytes': { factor: 1073741824, display: 'Gibibytes (GiB)', precision: 2 }
            }
        }
    };

    // Standard conversion function (for direct proportional conversions)
    function standardConvert(category, value, fromUnit, toUnit) {
        const conversionData = conversions[category];
        // If we have a special conversion function, use it
        if (conversionData.convert) {
            return conversionData.convert(value, fromUnit, toUnit);
        }
        
        // Otherwise use standard conversion via base unit
        const baseUnit = conversionData.base;
        const valueInBaseUnit = value * conversionData.units[fromUnit].factor;
        return valueInBaseUnit / conversionData.units[toUnit].factor;
    }

    // Function to update results for a specific category
    function updateResults(category) {
        const conversionData = conversions[category];
        const inputValue = parseFloat(document.getElementById(`${category}-value`).value);
        const fromUnit = document.getElementById(`${category}-unit`).value;
        const resultsContainer = document.getElementById(`${category}-results`);
        
        // Clear previous results
        resultsContainer.innerHTML = '';
        
        // Check if input is valid
        if (isNaN(inputValue)) {
            resultsContainer.innerHTML = '<p>Please enter a valid number</p>';
            return;
        }
        
        // Generate results for all units in this category
        for (const unitKey in conversionData.units) {
            const unitInfo = conversionData.units[unitKey];
            
            // Skip if it's the same as source unit
            if (unitKey === fromUnit) continue;
            
            let convertedValue;
            if (conversionData.convert) {
                // Use special conversion function if available
                convertedValue = conversionData.convert(inputValue, fromUnit, unitKey);
            } else {
                // Otherwise use standard conversion
                convertedValue = standardConvert(category, inputValue, fromUnit, unitKey);
            }
            
            const formattedValue = convertedValue.toFixed(unitInfo.precision);
            
            // Create result item
            const resultItem = document.createElement('div');
            resultItem.className = 'result-item';
            
            // Create unit label
            const unitLabel = document.createElement('div');
            unitLabel.className = 'result-unit';
            unitLabel.textContent = unitInfo.display;
            
            // Create value element
            const valueElement = document.createElement('div');
            valueElement.className = 'result-value';
            valueElement.textContent = formattedValue;
            
            // Add elements to result item
            resultItem.appendChild(unitLabel);
            resultItem.appendChild(valueElement);
            
            // Add result item to results container
            resultsContainer.appendChild(resultItem);
        }
    }

    // Set up tab switching
    document.querySelectorAll('.category-tab').forEach(tab => {
        tab.addEventListener('click', function() {
            // Update active tab
            document.querySelectorAll('.category-tab').forEach(t => {
                t.classList.remove('active');
            });
            this.classList.add('active');
            
            // Show appropriate panel
            const category = this.getAttribute('data-category');
            document.querySelectorAll('.conversion-panel').forEach(panel => {
                panel.classList.remove('active');
            });
            document.getElementById(`${category}-panel`).classList.add('active');
            
            // Update results for this category if it's implemented
            if (conversions[category] && document.getElementById(`${category}-value`)) {
                updateResults(category);
            }
        });
    });

    // Set up input event listeners for each category
    Object.keys(conversions).forEach(category => {
        const valueInput = document.getElementById(`${category}-value`);
        const unitSelect = document.getElementById(`${category}-unit`);
        
        if (valueInput && unitSelect) {
            valueInput.addEventListener('input', () => updateResults(category));
            unitSelect.addEventListener('change', () => updateResults(category));
        }
    });

    // Initialize results for active category
    updateResults('length');

    // Set current year in footer
    document.getElementById('year').textContent = new Date().getFullYear();
    </script>
</body>
</html>

Key Improvements:

  1. Sophisticated Color Palette:

    • Muted earth tones with teal accents for an elegant, professional look

    • Subtle background pattern for depth without distraction

  2. Refined Typography:

    • Used Lora (a beautiful serif font) for headings and Georgia for body text

    • Improved letter spacing and line heights for better readability

  3. Enhanced Visual Hierarchy:

    • Clear section dividers with subtle animations

    • Better spacing and padding throughout

    • Hover effects on interactive elements

  4. Complete Functionality:

    • All conversion types are fully implemented

    • Precise calculations maintained

    • Responsive design works on all devices

  5. Elegant Details:

    • Subtle animations when switching tabs

    • Custom styling for results with monospace numbers

    • Decorative elements like the header underline

The tool maintains all the original functionality while presenting it in a much more elegant and classy package.

this font in black: Precision Converter Elegant unit conversions with laser accuracy

Here's the updated code with the header text in black:

html
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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>Precision Converter | Elegant Unit Conversion Tool</title>
    <style>
        :root {
            --primary-color: #5d5c61;
            --secondary-color: #379683;
            --accent-color: #7395ae;
            --light-accent: #b1a296;
            --background-color: #f8f8f8;
            --card-background: #ffffff;
            --text-color: #333333;
            --light-text: #6d6d6d;
            --border-color: #e0e0e0;
            --shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
            --transition: all 0.3s ease;
        }

        body {
            font-family: 'Lora', 'Georgia', serif;
            margin: 0;
            padding: 0;
            background-color: var(--background-color);
            color: var(--text-color);
            line-height: 1.7;
            background-image: linear-gradient(to bottom, rgba(245,245,245,0.8), rgba(245,245,245,0.8)), 
                              url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="100" height="100" viewBox="0 0 100 100" fill="none" stroke="%23e0e0e0" stroke-width="0.5"><path d="M0,0 L100,100 M100,0 L0,100"/></svg>');
        }

        .container {
            max-width: 900px;
            margin: 0 auto;
            padding: 30px;
        }

        header {
            text-align: center;
            padding: 30px 0 40px;
            margin-bottom: 20px;
            position: relative;
        }

        header::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 100px;
            height: 3px;
            background: var(--secondary-color);
        }

        h1 {
            color: #000000; /* Changed to black */
            margin: 0;
            font-size: 2.5rem;
            font-weight: 400;
            letter-spacing: 1px;
        }

        .subtitle {
            color: #000000; /* Changed to black */
            margin: 10px 0 0;
            font-size: 1.1rem;
            font-style: italic;
            font-weight: 300;
        }

        /* ... [rest of the CSS remains exactly the same] ... */
    </style>
    <link href="https://fonts.googleapis.com/css2?family=Lora:ital,wght@0,400;0,500;0,600;0,700;1,400&display=swap" rel="stylesheet">
</head>
<body>
    <div class="container">
        <header>
            <h1>Precision Converter</h1>
            <p class="subtitle">Elegant unit conversions with laser accuracy</p>
        </header>

        <!-- ... [rest of the HTML remains exactly the same] ... -->
    </div>

    <!-- ... [rest of the JavaScript remains exactly the same] ... -->
</body>
</html>

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