diff --git a/webroot/css/ux-enhancements.css b/webroot/css/ux-enhancements.css
new file mode 100644
index 0000000..c9bdd03
--- /dev/null
+++ b/webroot/css/ux-enhancements.css
@@ -0,0 +1,184 @@
+/* ============================================
+   UX ENHANCEMENTS STYLES - Optimized
+   ============================================ */
+
+/* Keyboard Shortcuts Hint */
+.keyboard-hint {
+    position: fixed;
+    bottom: 20px;
+    right: 20px;
+    z-index: 1000;
+    background: #2a2a2a;
+    border: 1px solid #4a4a4a;
+    border-radius: 8px;
+    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.5);
+}
+
+.hint-toggle {
+    display: block;
+    padding: 10px 15px;
+    cursor: pointer;
+    font-size: 24px;
+    background: none;
+    border: none;
+    transition: transform 0.2s;
+}
+
+.hint-toggle:hover { transform: scale(1.1); }
+
+.hint-content {
+    padding: 15px;
+    max-width: 300px;
+}
+
+.hint-content h4 {
+    margin: 0 0 10px 0;
+    color: #4CAF50;
+    font-size: 14px;
+}
+
+.hint-content ul {
+    list-style: none;
+    padding: 0;
+    margin: 0;
+}
+
+.hint-content li {
+    padding: 5px 0;
+    font-size: 12px;
+    color: #cccccc;
+}
+
+.hint-content kbd {
+    background: #1a1a1a;
+    border: 1px solid #555;
+    border-radius: 3px;
+    padding: 2px 6px;
+    font-family: 'Consolas', monospace;
+    font-size: 11px;
+    color: #ffffff;
+    margin-right: 8px;
+}
+
+/* Compact Mode Toggle Button */
+.compact-toggle {
+    background: #2a2a2a;
+    border: 1px solid #4a4a4a;
+    border-radius: 4px;
+    color: #cccccc;
+    padding: 8px 15px;
+    cursor: pointer;
+    font-size: 12px;
+    transition: all 0.2s;
+}
+
+.compact-toggle:hover {
+    background: #3a3a3a;
+    border-color: #666666;
+    color: #ffffff;
+}
+
+/* Compact Mode Styles - Condensed */
+body.compact-mode .section { padding: 10px; }
+body.compact-mode .section h2 { font-size: 14px; margin-bottom: 8px; }
+body.compact-mode .input-group { margin-bottom: 8px; }
+body.compact-mode .input-group label { font-size: 11px; }
+body.compact-mode .input-group input { padding: 4px 8px; font-size: 12px; }
+body.compact-mode .result-item { padding: 6px 10px; }
+body.compact-mode .result-label,
+body.compact-mode .result-value { font-size: 11px; }
+body.compact-mode .hex-calculator { display: none; }
+body.compact-mode .tab { padding: 6px 12px; font-size: 12px; }
+body.compact-mode .formula-item { padding: 4px 8px; font-size: 11px; }
+
+/* Context Menu - Condensed */
+.context-menu {
+    position: fixed;
+    background: #2a2a2a;
+    border: 1px solid #4a4a4a;
+    border-radius: 6px;
+    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.5);
+    z-index: 10000;
+    min-width: 250px;
+    padding: 4px 0;
+}
+
+.context-menu-header {
+    padding: 8px 12px;
+    font-size: 11px;
+    color: #888888;
+    font-weight: bold;
+    border-bottom: 1px solid #3a3a3a;
+    text-transform: uppercase;
+}
+
+.context-menu-item {
+    display: flex;
+    justify-content: space-between;
+    padding: 8px 12px;
+    cursor: pointer;
+    transition: background-color 0.2s;
+    font-size: 12px;
+}
+
+.context-menu-item:hover { background: #3a3a3a; }
+
+.format-label { color: #888888; font-weight: bold; margin-right: 15px; }
+.format-value { color: #4CAF50; font-family: 'Consolas', monospace; font-weight: bold; }
+
+/* Notification System - Condensed */
+.notification {
+    position: fixed;
+    top: 20px;
+    right: 20px;
+    padding: 12px 20px;
+    background: #2a2a2a;
+    border: 1px solid #4a4a4a;
+    border-radius: 6px;
+    color: #ffffff;
+    font-size: 13px;
+    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.5);
+    z-index: 10001;
+    opacity: 0;
+    transform: translateX(400px);
+    transition: all 0.3s ease;
+}
+
+.notification.show { opacity: 1; transform: translateX(0); }
+.notification-success { border-left: 4px solid #4CAF50; }
+.notification-info { border-left: 4px solid #2196F3; }
+.notification-warning { border-left: 4px solid #FF9800; }
+.notification-error { border-left: 4px solid #F44336; }
+
+/* Hover effects & Responsive - Condensed */
+.result-value, .conv-value { cursor: pointer; transition: background-color 0.3s; }
+.result-value:hover, .conv-value:hover { background-color: rgba(76, 175, 80, 0.1); }
+
+button:focus-visible,
+input:focus-visible,
+.tab:focus-visible { outline: 2px solid #4CAF50; outline-offset: 2px; }
+
+.sr-only {
+    position: absolute;
+    width: 1px;
+    height: 1px;
+    padding: 0;
+    margin: -1px;
+    overflow: hidden;
+    clip: rect(0, 0, 0, 0);
+    white-space: nowrap;
+    border-width: 0;
+}
+
+/* Responsive */
+@media (max-width: 768px) {
+    .keyboard-hint, .notification { bottom: 10px; right: 10px; }
+    .notification { top: 10px; max-width: calc(100% - 20px); }
+}
+
+@media print {
+    .keyboard-hint,
+    .compact-toggle,
+    .context-menu,
+    .notification { display: none !important; }
+}
diff --git a/webroot/index.html b/webroot/index.html
index aabaf29..a0d31fc 100644
--- a/webroot/index.html
+++ b/webroot/index.html
@@ -7,6 +7,7 @@
     <title>Dateisystem-Offset-Rechner</title>
     <link rel="stylesheet" href="css/main.css">
     <link rel="stylesheet" href="css/components.css">
+    <link rel="stylesheet" href="css/ux-enhancements.css">
 </head>
 
 <body>
diff --git a/webroot/js/filesystems/exfat.js b/webroot/js/filesystems/exfat.js
index 9a425e1..549e998 100644
--- a/webroot/js/filesystems/exfat.js
+++ b/webroot/js/filesystems/exfat.js
@@ -62,26 +62,10 @@ export class ExFATFilesystem extends BaseFilesystem {
 
     calculate(variantId) {
         if (variantId !== 'exfat') return;
-
-        const values = {};
+        
+        const values = this.getInputValues(variantId);
         const results = {};
-
-        // Gather all input values for this variant
-        const variant = this.variants.find(v => v.id === variantId);
-        if (!variant) return;
-
-        [...variant.constants, ...variant.inputs].forEach(field => {
-            const el = document.getElementById(field.id);
-            if (el) {
-                let val = el.value;
-                if (val && val.startsWith('0x')) {
-                    values[field.id] = parseInt(val, 16);
-                } else {
-                    values[field.id] = Number(val) || 0;
-                }
-            }
-        });
-
+        
         this.calculateExFAT(values, results);
     }
 
diff --git a/webroot/js/filesystems/fat.js b/webroot/js/filesystems/fat.js
index d9ad53c..b0e6db8 100644
--- a/webroot/js/filesystems/fat.js
+++ b/webroot/js/filesystems/fat.js
@@ -8,22 +8,10 @@ import { checkDependencies, updateResultItem } from '../utils.js';
 export class FAT12_16Filesystem extends BaseFilesystem {
     calculate(variantId) {
         if (variantId !== 'fat1216') return;
-        const values = {};
+        
+        const values = this.getInputValues(variantId);
         const results = {};
-        // Gather all input values for this variant
-        const variant = this.variants.find(v => v.id === variantId);
-        if (!variant) return;
-        [...variant.constants, ...variant.inputs].forEach(field => {
-            const el = document.getElementById(field.id);
-            if (el) {
-                let val = el.value;
-                if (val && val.startsWith('0x')) {
-                    values[field.id] = parseInt(val, 16);
-                } else {
-                    values[field.id] = Number(val) || 0;
-                }
-            }
-        });
+        
         this.calculateFAT1216(values, results);
     }
     constructor() {
@@ -211,22 +199,10 @@ export class FAT12_16Filesystem extends BaseFilesystem {
 export class FAT32Filesystem extends BaseFilesystem {
     calculate(variantId) {
         if (variantId !== 'fat32') return;
-        const values = {};
+        
+        const values = this.getInputValues(variantId);
         const results = {};
-        // Gather all input values for this variant
-        const variant = this.variants.find(v => v.id === variantId);
-        if (!variant) return;
-        [...variant.constants, ...variant.inputs].forEach(field => {
-            const el = document.getElementById(field.id);
-            if (el) {
-                let val = el.value;
-                if (val && val.startsWith('0x')) {
-                    values[field.id] = parseInt(val, 16);
-                } else {
-                    values[field.id] = Number(val) || 0;
-                }
-            }
-        });
+        
         this.calculateFAT32(values, results);
     }
     constructor() {
diff --git a/webroot/js/main.js b/webroot/js/main.js
index 17ce81a..4fb4e98 100644
--- a/webroot/js/main.js
+++ b/webroot/js/main.js
@@ -5,6 +5,7 @@ import { Calculator } from './calculator.js';
 import { FAT12_16Filesystem, FAT32Filesystem } from './filesystems/fat.js';
 import { NTFSFilesystem } from './filesystems/ntfs.js';
 import { ExFATFilesystem } from './filesystems/exfat.js';
+import { initializeUXEnhancements } from './ux-enhancements.js';
 
 class FilesystemCalculator {
     constructor() {
@@ -87,6 +88,9 @@ class FilesystemCalculator {
         setupTooltips();
         setupCopyButtons();
         
+        // Initialize UX enhancements
+        initializeUXEnhancements();
+        
         window.copyToClipboard = (elementId) => {
             import('./utils.js').then(module => {
                 module.copyToClipboard(elementId);
diff --git a/webroot/js/ux-enhancements.js b/webroot/js/ux-enhancements.js
new file mode 100644
index 0000000..fe7dc22
--- /dev/null
+++ b/webroot/js/ux-enhancements.js
@@ -0,0 +1,340 @@
+// Enhanced UX utilities for hex editor companion workflow
+
+import { copyToClipboard as originalCopyToClipboard, formatHex } from './utils.js';
+
+// ============================================
+// 1. KEYBOARD SHORTCUTS
+// ============================================
+
+export function setupKeyboardShortcuts() {
+    document.addEventListener('keydown', (e) => {
+        // Ctrl+1-9: Switch tabs
+        if (e.ctrlKey && !e.shiftKey && !e.altKey) {
+            const num = parseInt(e.key);
+            if (num >= 1 && num <= 9) {
+                const tabs = document.querySelectorAll('.tab');
+                if (tabs[num - 1]) {
+                    e.preventDefault();
+                    tabs[num - 1].click();
+                }
+            }
+        }
+
+        // Ctrl+K: Focus calculator
+        if (e.ctrlKey && e.key === 'k') {
+            e.preventDefault();
+            const calcInput = document.querySelector('.tab-content.active .calc-input-field');
+            if (calcInput) calcInput.focus();
+        }
+
+        // Ctrl+L: Focus first input field
+        if (e.ctrlKey && e.key === 'l') {
+            e.preventDefault();
+            const firstInput = document.querySelector('.tab-content.active .input-group input');
+            if (firstInput) firstInput.focus();
+        }
+
+        // Alt+C: Clear all inputs in active tab
+        if (e.altKey && e.key === 'c') {
+            e.preventDefault();
+            const inputs = document.querySelectorAll('.tab-content.active .input-group input');
+            inputs.forEach(input => {
+                if (!input.id.toLowerCase().includes('size') && !input.id.toLowerCase().includes('offset')) {
+                    input.value = '';
+                }
+            });
+            // Trigger recalculation
+            if (inputs.length > 0) {
+                inputs[0].dispatchEvent(new Event('input', { bubbles: true }));
+            }
+        }
+
+        // Ctrl+Shift+C: Copy all visible results
+        if (e.ctrlKey && e.shiftKey && e.key === 'C') {
+            e.preventDefault();
+            copyAllResults();
+        }
+    });
+
+    // Show keyboard shortcuts hint
+    showShortcutsHint();
+}
+
+function showShortcutsHint() {
+    // Create hint element if it doesn't exist
+    if (document.getElementById('keyboard-hint')) return;
+    
+    const hint = document.createElement('div');
+    hint.id = 'keyboard-hint';
+    hint.className = 'keyboard-hint';
+    hint.innerHTML = `
+        <span class="hint-toggle" title="Tastenkombinationen anzeigen">⌨️</span>
+        <div class="hint-content" style="display: none;">
+            <h4>Tastenkombinationen</h4>
+            <ul>
+                <li><kbd>Ctrl+1-9</kbd> Tabs wechseln</li>
+                <li><kbd>Ctrl+K</kbd> Rechner fokussieren</li>
+                <li><kbd>Ctrl+L</kbd> Erste Eingabe fokussieren</li>
+                <li><kbd>Alt+C</kbd> Eingaben löschen</li>
+                <li><kbd>Ctrl+Shift+C</kbd> Alle Ergebnisse kopieren</li>
+                <li><kbd>Doppelklick</kbd> Wert kopieren</li>
+            </ul>
+        </div>
+    `;
+    document.body.appendChild(hint);
+
+    // Toggle hint visibility
+    hint.querySelector('.hint-toggle').addEventListener('click', () => {
+        const content = hint.querySelector('.hint-content');
+        content.style.display = content.style.display === 'none' ? 'block' : 'none';
+    });
+}
+
+function copyAllResults() {
+    const results = [];
+    const activeTab = document.querySelector('.tab-content.active');
+    if (!activeTab) return;
+
+    const resultItems = activeTab.querySelectorAll('.result-item.available');
+    resultItems.forEach(item => {
+        const label = item.querySelector('.result-label')?.textContent.trim();
+        const value = item.querySelector('.result-value')?.textContent.trim();
+        if (label && value && value !== '-') {
+            results.push(`${label}: ${value}`);
+        }
+    });
+
+    if (results.length > 0) {
+        const text = results.join('\n');
+        navigator.clipboard.writeText(text).then(() => {
+            showNotification('Alle Ergebnisse kopiert!', 'success');
+        });
+    }
+}
+
+// ============================================
+// 2. DOUBLE-CLICK TO COPY
+// ============================================
+
+export function setupDoubleClickCopy() {
+    document.addEventListener('dblclick', (e) => {
+        // Check if double-clicked on a result value or any hex value
+        const target = e.target;
+        
+        if (target.classList.contains('result-value') || 
+            target.classList.contains('conv-value') ||
+            target.closest('.result-value')) {
+            
+            const element = target.classList.contains('result-value') ? target : target.closest('.result-value');
+            const text = element.textContent.trim();
+            
+            // Extract hex value
+            const hexMatch = text.match(/0x[0-9a-fA-F]+/);
+            if (hexMatch) {
+                navigator.clipboard.writeText(hexMatch[0]).then(() => {
+                    highlightElement(element);
+                    showNotification('Kopiert: ' + hexMatch[0], 'success');
+                });
+            }
+        }
+    });
+}
+
+function highlightElement(element) {
+    element.style.transition = 'background-color 0.3s';
+    element.style.backgroundColor = '#4CAF50';
+    setTimeout(() => {
+        element.style.backgroundColor = '';
+    }, 300);
+}
+
+// ============================================
+// 3. COMPACT MODE TOGGLE
+// ============================================
+
+export function setupCompactMode() {
+    const toggle = document.createElement('button');
+    toggle.id = 'compact-mode-toggle';
+    toggle.className = 'compact-toggle';
+    toggle.innerHTML = '⚡ Kompakt';
+    toggle.title = 'Kompaktansicht umschalten';
+    
+    // Insert toggle button in header
+    const header = document.querySelector('.header-content .nav');
+    if (header) {
+        const toggleContainer = document.createElement('div');
+        toggleContainer.appendChild(toggle);
+        header.appendChild(toggleContainer);
+    }
+
+    // Load saved preference
+    const isCompact = localStorage.getItem('compactMode') === 'true';
+    if (isCompact) {
+        document.body.classList.add('compact-mode');
+        toggle.innerHTML = '🔍 Normal';
+    }
+
+    toggle.addEventListener('click', () => {
+        document.body.classList.toggle('compact-mode');
+        const isNowCompact = document.body.classList.contains('compact-mode');
+        toggle.innerHTML = isNowCompact ? '🔍 Normal' : '⚡ Kompakt';
+        localStorage.setItem('compactMode', isNowCompact);
+        showNotification(isNowCompact ? 'Kompaktmodus aktiviert' : 'Normalmodus aktiviert', 'info');
+    });
+}
+
+// ============================================
+// 4. AUTO-CALCULATE ON PASTE
+// ============================================
+
+export function setupAutoCalculateOnPaste() {
+    document.addEventListener('paste', (e) => {
+        const target = e.target;
+        
+        // Only handle paste in input fields
+        if (target.tagName !== 'INPUT' || !target.closest('.input-group')) {
+            return;
+        }
+
+        setTimeout(() => {
+            // Trigger calculation after paste
+            target.dispatchEvent(new Event('input', { bubbles: true }));
+            showNotification('Wert eingefügt und berechnet', 'info');
+        }, 10);
+    });
+}
+
+// ============================================
+// 5. ENHANCED COPY WITH FORMAT OPTIONS
+// ============================================
+
+export function setupContextMenu() {
+    let contextMenu = null;
+
+    document.addEventListener('contextmenu', (e) => {
+        const target = e.target;
+        
+        if (target.classList.contains('result-value') || target.classList.contains('conv-value')) {
+            e.preventDefault();
+            
+            const text = target.textContent.trim();
+            const hexMatch = text.match(/0x[0-9a-fA-F]+/);
+            
+            if (hexMatch) {
+                const hexValue = hexMatch[0];
+                const decValue = parseInt(hexValue, 16);
+                
+                showContextMenu(e.pageX, e.pageY, hexValue, decValue);
+            }
+        }
+    });
+
+    // Close menu on click outside
+    document.addEventListener('click', () => {
+        if (contextMenu) {
+            contextMenu.remove();
+            contextMenu = null;
+        }
+    });
+
+    function showContextMenu(x, y, hexValue, decValue) {
+        // Remove existing menu
+        if (contextMenu) contextMenu.remove();
+
+        contextMenu = document.createElement('div');
+        contextMenu.className = 'context-menu';
+        contextMenu.style.left = x + 'px';
+        contextMenu.style.top = y + 'px';
+
+        const hexNoPrefix = hexValue.substring(2);
+        const binary = '0b' + decValue.toString(2);
+        const littleEndian = toLittleEndianBytes(decValue);
+
+        contextMenu.innerHTML = `
+            <div class="context-menu-header">Kopieren als:</div>
+            <div class="context-menu-item" data-value="${hexValue}">
+                <span class="format-label">Hex (0x)</span>
+                <span class="format-value">${hexValue}</span>
+            </div>
+            <div class="context-menu-item" data-value="${hexNoPrefix}">
+                <span class="format-label">Hex (roh)</span>
+                <span class="format-value">${hexNoPrefix}</span>
+            </div>
+            <div class="context-menu-item" data-value="${decValue}">
+                <span class="format-label">Dezimal</span>
+                <span class="format-value">${decValue}</span>
+            </div>
+            <div class="context-menu-item" data-value="${binary}">
+                <span class="format-label">Binär</span>
+                <span class="format-value">${binary}</span>
+            </div>
+            <div class="context-menu-item" data-value="${littleEndian}">
+                <span class="format-label">Little-Endian</span>
+                <span class="format-value">${littleEndian}</span>
+            </div>
+        `;
+
+        document.body.appendChild(contextMenu);
+
+        // Handle menu item clicks
+        contextMenu.querySelectorAll('.context-menu-item').forEach(item => {
+            item.addEventListener('click', (e) => {
+                e.stopPropagation();
+                const value = item.getAttribute('data-value');
+                navigator.clipboard.writeText(value).then(() => {
+                    showNotification('Kopiert: ' + value, 'success');
+                    contextMenu.remove();
+                    contextMenu = null;
+                });
+            });
+        });
+    }
+}
+
+function toLittleEndianBytes(value) {
+    const bytes = [];
+    let num = value;
+    
+    // Convert to 4-byte little-endian
+    for (let i = 0; i < 4; i++) {
+        bytes.push((num & 0xFF).toString(16).padStart(2, '0').toUpperCase());
+        num = num >> 8;
+    }
+    
+    return bytes.join(' ');
+}
+
+// ============================================
+// 6. NOTIFICATION SYSTEM
+// ============================================
+
+function showNotification(message, type = 'info') {
+    const notification = document.createElement('div');
+    notification.className = `notification notification-${type}`;
+    notification.textContent = message;
+    
+    document.body.appendChild(notification);
+    
+    // Trigger animation
+    setTimeout(() => notification.classList.add('show'), 10);
+    
+    // Remove after 2 seconds
+    setTimeout(() => {
+        notification.classList.remove('show');
+        setTimeout(() => notification.remove(), 300);
+    }, 2000);
+}
+
+// ============================================
+// INITIALIZATION
+// ============================================
+
+export function initializeUXEnhancements() {
+    setupKeyboardShortcuts();
+    setupDoubleClickCopy();
+    setupCompactMode();
+    setupAutoCalculateOnPaste();
+    setupContextMenu();
+    
+    console.log('✨ UX Enhancements activated!');
+}