V1.1 Gut!

css/master.css

@@ -139,6 +139,7 @@ body {
     background: linear-gradient(135deg, #667eea15 0%, #764ba215 100%);
     border-radius: 12px;
     border: 2px solid #667eea;
+    flex-wrap: wrap;
 }
 
 .nav-button {
@@ -171,6 +172,32 @@ body {
     text-align: center;
 }
 
+.page-jump {
+    display: flex;
+    align-items: center;
+    gap: 8px;
+    margin-left: 10px;
+    padding-left: 15px;
+    border-left: 2px solid rgba(102, 126, 234, 0.3);
+}
+
+#jumpToPageInput {
+    width: 60px;
+    padding: 8px;
+    border: 2px solid #667eea;
+    border-radius: 6px;
+    text-align: center;
+    font-size: 1em;
+    font-weight: 500;
+    color: #667eea;
+}
+
+#jumpToPageInput:focus {
+    outline: none;
+    border-color: #764ba2;
+    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.2);
+}
+
 .page-selector label {
     display: inline-flex;
     align-items: center;
@@ -222,6 +249,46 @@ body {
     font-size: 0.9em;
 }
 
+.signature-placeholder {
+    background: white;
+    border: 2px dashed #667eea;
+    border-radius: 8px;
+    padding: 12px;
+    margin-bottom: 15px;
+    text-align: center;
+    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
+    max-width: 400px;
+    margin-left: auto;
+    margin-right: auto;
+}
+
+.placeholder-content {
+    display: flex;
+    flex-direction: column;
+    align-items: center;
+    justify-content: center;
+    gap: 8px;
+}
+
+.placeholder-icon {
+    font-size: 1.8em;
+    opacity: 0.7;
+}
+
+.placeholder-text {
+    font-size: 0.9em;
+    color: #667eea;
+    font-weight: 500;
+}
+
+#placeholderSignatureImage {
+    max-width: 200px;
+    max-height: 80px;
+    width: auto;
+    height: auto;
+    margin-top: 8px;
+}
+
 .signature-overlay {
     position: absolute;
     border: 3px dashed #667eea;

html/master.html

@@ -44,6 +44,18 @@
                     <button class="nav-button" id="prevPageBtn" onclick="changePage(-1)">◀ Zurück</button>
                     <span id="pageInfo">Seite 1 von 1</span>
                     <button class="nav-button" id="nextPageBtn" onclick="changePage(1)">Weiter ▶</button>
+                    <div class="page-jump">
+                        <input type="number" id="jumpToPageInput" min="1" max="1" placeholder="Seite" style="width: 60px; padding: 5px; border: 1px solid #667eea; border-radius: 4px; text-align: center;">
+                        <button class="nav-button" id="jumpToPageBtn" onclick="jumpToPage()">Springe zu Seite</button>
+                    </div>
+                </div>
+
+                <div class="signature-placeholder" id="signaturePlaceholder" style="display: none;">
+                    <div class="placeholder-content" id="placeholderContent">
+                        <span class="placeholder-icon">✍️</span>
+                        <span class="placeholder-text">Empfangene Unterschrift wird hier angezeigt</span>
+                    </div>
+                    <img id="placeholderSignatureImage" src="" alt="Unterschrift" style="display: none;">
                 </div>
 
                 <div class="pdf-preview" id="pdfPreview">

js/master.js

@@ -114,6 +114,27 @@ document.getElementById('pdfInput').addEventListener('change', async (e) => {
     document.getElementById('uploadSection').style.display = 'none';
     document.getElementById('statusSection').style.display = 'block';
 
+    // Show signature placeholder
+    document.getElementById('signaturePlaceholder').style.display = 'block';
+
+    // If signature already exists, make sure overlay will be visible
+    if (signatureDataUrl) {
+        const overlay = document.getElementById('signatureOverlay');
+        if (overlay) {
+            // Ensure overlay is ready to be shown
+            overlay.style.display = 'none'; // Reset first
+            overlay.classList.remove('show'); // Reset class
+            // Reset position to default when loading new PDF
+            signaturePos.x = 0.5;
+            signaturePos.y = 0.1;
+            console.log('Overlay zurückgesetzt für neues PDF-Laden, Position auf Standard zurückgesetzt');
+        }
+    } else {
+        // Reset position to default if no signature
+        signaturePos.x = 0.5;
+        signaturePos.y = 0.1;
+    }
+
     // Render PDF preview using the copy
     await renderPdfPreview(renderCopy);
 
@@ -174,6 +195,111 @@ async function renderPdfPreview(pdfBytes, pageNum = 1) {
         // Update page navigation
         updatePageNavigation();
 
+        // If signature was already received, show it again after PDF loads
+        setTimeout(() => {
+            const overlay = document.getElementById('signatureOverlay');
+            const placeholder = document.getElementById('signaturePlaceholder');
+
+            if (signatureDataUrl && overlay) {
+                // Signature was already received, restore it
+                console.log('=== Unterschrift war bereits vorhanden, zeige sie wieder an ===');
+                const img = document.getElementById('signatureImage');
+                const placeholderImg = document.getElementById('placeholderSignatureImage');
+                const placeholderContent = document.getElementById('placeholderContent');
+
+                // Show in placeholder
+                placeholder.style.display = 'block';
+                placeholderImg.src = signatureDataUrl;
+                placeholderImg.style.display = 'block';
+                placeholderContent.style.display = 'none';
+
+                // Show in overlay - IMPORTANT: Set image src FIRST, then show overlay
+                img.src = signatureDataUrl;
+
+                // Ensure overlay is visible
+                overlay.classList.add('show');
+                overlay.style.display = 'block'; // Force display
+
+                console.log('Overlay show-Klasse hinzugefügt:', overlay.classList.contains('show'));
+
+                // Position overlay (only if single page view, not all pages)
+                const pdfPreview = document.getElementById('pdfPreview');
+                if (!pdfPreview.classList.contains('scrollable')) {
+                    // Single page view - position overlay
+                    const canvas = document.getElementById('pdfCanvas');
+                    if (canvas && canvas.clientWidth > 0 && canvas.clientHeight > 0) {
+                        const overlayWidth = 250;
+                        // Calculate position and ensure it's within bounds
+                        let leftPos = canvas.clientWidth * signaturePos.x - overlayWidth / 2;
+                        let topPos = canvas.clientHeight * signaturePos.y;
+
+                        // Clamp position to visible area
+                        leftPos = Math.max(0, Math.min(leftPos, canvas.clientWidth - overlayWidth));
+                        topPos = Math.max(0, Math.min(topPos, canvas.clientHeight - 100)); // 100px min height for overlay
+
+                        overlay.style.left = leftPos + 'px';
+                        overlay.style.top = topPos + 'px';
+                        overlay.style.position = 'absolute';
+                        overlay.style.zIndex = '10';
+
+                        // Update signaturePos with clamped values
+                        signaturePos.x = (leftPos + overlayWidth / 2) / canvas.clientWidth;
+                        signaturePos.y = topPos / canvas.clientHeight;
+
+                        console.log('Overlay positioniert nach PDF-Laden:', overlay.style.left, overlay.style.top);
+                        console.log('Canvas Größe:', canvas.clientWidth, 'x', canvas.clientHeight);
+                        console.log('Overlay sichtbar:', overlay.classList.contains('show'), 'display:', overlay.style.display);
+                    } else {
+                        // Retry positioning - canvas might not be ready yet
+                        console.log('Canvas noch nicht bereit, versuche erneut...');
+                        setTimeout(() => {
+                            const canvas = document.getElementById('pdfCanvas');
+                            if (canvas && canvas.clientWidth > 0) {
+                                const overlayWidth = 250;
+                                // Calculate position and ensure it's within bounds
+                                let leftPos = canvas.clientWidth * signaturePos.x - overlayWidth / 2;
+                                let topPos = canvas.clientHeight * signaturePos.y;
+
+                                // Clamp position to visible area
+                                leftPos = Math.max(0, Math.min(leftPos, canvas.clientWidth - overlayWidth));
+                                topPos = Math.max(0, Math.min(topPos, canvas.clientHeight - 100));
+
+                                overlay.style.left = leftPos + 'px';
+                                overlay.style.top = topPos + 'px';
+                                overlay.style.position = 'absolute';
+                                overlay.style.zIndex = '10';
+                                overlay.classList.add('show');
+                                overlay.style.display = 'block';
+
+                                // Update signaturePos with clamped values
+                                signaturePos.x = (leftPos + overlayWidth / 2) / canvas.clientWidth;
+                                signaturePos.y = topPos / canvas.clientHeight;
+
+                                console.log('Overlay positioniert (2. Versuch nach PDF-Laden):', overlay.style.left, overlay.style.top);
+                                console.log('Overlay sichtbar:', overlay.classList.contains('show'));
+                            } else {
+                                console.error('Canvas auch nach Retry nicht gefunden!');
+                            }
+                        }, 500);
+                    }
+                } else {
+                    // All pages view - hide overlay
+                    overlay.classList.remove('show');
+                    overlay.style.display = 'none';
+                }
+
+                // Show controls
+                document.getElementById('signatureControls').classList.add('show');
+            } else {
+                // No signature yet, show placeholder
+                if (!overlay.classList.contains('show')) {
+                    placeholder.style.display = 'block';
+                } else {
+                    placeholder.style.display = 'none';
+                }
+            }
+        }, 300); // Increased delay to ensure canvas is ready
+
         console.log('PDF Seite', pageNum, 'erfolgreich gerendert');
     } catch (error) {
         console.error('Fehler beim Rendern des PDFs:', error);
@@ -207,6 +333,14 @@ async function renderAllPages(pdfBytes) {
         const pdfPreview = document.getElementById('pdfPreview');
         pdfPreview.classList.add('scrollable');
 
+        // Hide signature overlay when showing all pages
+        const overlay = document.getElementById('signatureOverlay');
+        if (overlay) {
+            overlay.classList.remove('show');
+            overlay.style.display = 'none';
+            console.log('Overlay ausgeblendet beim Rendern aller Seiten');
+        }
+
         // Render all pages
         for (let pageNum = 1; pageNum <= numPages; pageNum++) {
 
@@ -253,6 +387,7 @@ function updatePageNavigation() {
     const pageInfo = document.getElementById('pageInfo');
     const prevBtn = document.getElementById('prevPageBtn');
     const nextBtn = document.getElementById('nextPageBtn');
+    const jumpInput = document.getElementById('jumpToPageInput');
     const pageSelector = document.getElementById('pageSelector');
     const currentPageNumSpan = document.getElementById('currentPageNum');
 
@@ -262,6 +397,12 @@ function updatePageNavigation() {
         prevBtn.disabled = currentPageNum <= 1;
         nextBtn.disabled = currentPageNum >= totalPages;
 
+        // Update jump input max value and placeholder
+        if (jumpInput) {
+            jumpInput.max = totalPages;
+            jumpInput.placeholder = `1-${totalPages}`;
+        }
+
         // Show page selector if signature is visible
         if (document.getElementById('signatureOverlay').classList.contains('show')) {
             pageSelector.style.display = 'block';
@@ -273,12 +414,98 @@ function updatePageNavigation() {
     }
 }
 
+async function jumpToPage() {
+    const jumpInput = document.getElementById('jumpToPageInput');
+    const pageNum = parseInt(jumpInput.value);
+
+    if (isNaN(pageNum) || pageNum < 1 || pageNum > totalPages) {
+        alert(`Bitte geben Sie eine gültige Seitennummer zwischen 1 und ${totalPages} ein.`);
+        jumpInput.value = '';
+        return;
+    }
+
+    if (pageNum === currentPageNum) {
+        jumpInput.value = '';
+        return; // Already on this page
+    }
+
+    await renderPdfPreview(originalPdfBytes, pageNum);
+
+    // Reposition overlay if signature is visible
+    setTimeout(() => {
+        const overlay = document.getElementById('signatureOverlay');
+        if (overlay && overlay.classList.contains('show')) {
+            const canvas = document.getElementById('pdfCanvas');
+            if (canvas && canvas.clientWidth > 0 && canvas.clientHeight > 0) {
+                const overlayWidth = 250;
+                // Calculate position and ensure it's within bounds
+                let leftPos = canvas.clientWidth * signaturePos.x - overlayWidth / 2;
+                let topPos = canvas.clientHeight * signaturePos.y;
+
+                // Clamp position to visible area
+                leftPos = Math.max(0, Math.min(leftPos, canvas.clientWidth - overlayWidth));
+                topPos = Math.max(0, Math.min(topPos, canvas.clientHeight - 100));
+
+                overlay.style.left = leftPos + 'px';
+                overlay.style.top = topPos + 'px';
+                overlay.style.position = 'absolute';
+
+                // Update signaturePos with clamped values
+                signaturePos.x = (leftPos + overlayWidth / 2) / canvas.clientWidth;
+                signaturePos.y = topPos / canvas.clientHeight;
+
+                console.log('Overlay nach Seitenwechsel positioniert:', overlay.style.left, overlay.style.top);
+            }
+        }
+    }, 100);
+
+    // Send page change to signature station
+    if (ws && ws.readyState === WebSocket.OPEN) {
+        ws.send(JSON.stringify({
+            type: 'page_change',
+            pageNum: pageNum,
+            totalPages: totalPages
+        }));
+    }
+
+    // Clear input
+    jumpInput.value = '';
+}
+
 async function changePage(direction) {
     const newPage = currentPageNum + direction;
     if (newPage < 1 || newPage > totalPages) return;
 
     await renderPdfPreview(originalPdfBytes, newPage);
 
+    // Reposition overlay if signature is visible
+    setTimeout(() => {
+        const overlay = document.getElementById('signatureOverlay');
+        if (overlay && overlay.classList.contains('show')) {
+            const canvas = document.getElementById('pdfCanvas');
+            if (canvas && canvas.clientWidth > 0 && canvas.clientHeight > 0) {
+                const overlayWidth = 250;
+                // Calculate position and ensure it's within bounds
+                let leftPos = canvas.clientWidth * signaturePos.x - overlayWidth / 2;
+                let topPos = canvas.clientHeight * signaturePos.y;
+
+                // Clamp position to visible area
+                leftPos = Math.max(0, Math.min(leftPos, canvas.clientWidth - overlayWidth));
+                topPos = Math.max(0, Math.min(topPos, canvas.clientHeight - 100));
+
+                overlay.style.left = leftPos + 'px';
+                overlay.style.top = topPos + 'px';
+                overlay.style.position = 'absolute';
+
+                // Update signaturePos with clamped values
+                signaturePos.x = (leftPos + overlayWidth / 2) / canvas.clientWidth;
+                signaturePos.y = topPos / canvas.clientHeight;
+
+                console.log('Overlay nach Seitenwechsel positioniert:', overlay.style.left, overlay.style.top);
+            }
+        }
+    }, 100);
+
     // Send page change to signature station
     if (ws && ws.readyState === WebSocket.OPEN) {
         ws.send(JSON.stringify({
@@ -308,12 +535,37 @@ function updatePageSelection() {
     }
 }
 
+// Placeholder handling is now simpler - just show/hide
+
 async function showSignatureOverlay(signatureDataUrl) {
+    console.log('=== showSignatureOverlay aufgerufen ===');
+    console.log('signatureDataUrl Länge:', signatureDataUrl ? signatureDataUrl.length : 'NULL');
+
     const overlay = document.getElementById('signatureOverlay');
     const img = document.getElementById('signatureImage');
+    const placeholder = document.getElementById('signaturePlaceholder');
+    const placeholderImg = document.getElementById('placeholderSignatureImage');
+    const placeholderContent = document.getElementById('placeholderContent');
 
+    if (!overlay || !img || !placeholder) {
+        console.error('FEHLER: Overlay, img oder placeholder nicht gefunden!');
+        return;
+    }
+
+    // Show signature in placeholder first (always visible)
+    placeholder.style.display = 'block';
+    placeholderImg.src = signatureDataUrl;
+    placeholderImg.style.display = 'block';
+    placeholderContent.style.display = 'none';
+
+    console.log('Unterschrift im Platzhalter angezeigt');
+
+    // Also show in overlay for dragging on PDF
     img.src = signatureDataUrl;
     overlay.classList.add('show');
+    overlay.style.display = 'block'; // Force display
+    overlay.style.position = 'absolute'; // Ensure positioning works
+    overlay.style.zIndex = '10'; // Ensure it's on top
 
     document.getElementById('signatureControls').classList.add('show');
 
@@ -324,90 +576,159 @@ async function showSignatureOverlay(signatureDataUrl) {
     }
 
     document.getElementById('statusMessage').className = 'status signed';
-    document.getElementById('statusMessage').textContent = '✅ Unterschrift erhalten! Wähle die Seite(n) und positioniere sie.';
+    document.getElementById('statusMessage').textContent = '✅ Unterschrift erhalten! Unterschrift oben sichtbar. Ziehe sie auf das PDF.';
     document.getElementById('downloadButton').disabled = true;
     document.getElementById('downloadHint').style.display = 'none';
 
-    // Position signature initially (use clientWidth for displayed size)
+    // Initialize drag and resize handlers (only once)
-    const canvas = document.getElementById('pdfCanvas');
+    initializeDragAndResize();
-    overlay.style.left = (canvas.clientWidth * signaturePos.x) + 'px';
-    overlay.style.top = (canvas.clientHeight * signaturePos.y) + 'px';
 
-    // Make signature draggable
+    // Wait for canvas to be ready, then position signature overlay
-    makeDraggable(overlay);
+    setTimeout(() => {
-    makeResizable(overlay);
+        const canvas = document.getElementById('pdfCanvas');
+        if (canvas && canvas.clientWidth > 0 && canvas.clientHeight > 0) {
+            // Position signature overlay on PDF (centered horizontally, top area)
+            const overlayWidth = 250; // Initial width
+            // Calculate position and ensure it's within bounds
+            let leftPos = canvas.clientWidth * signaturePos.x - overlayWidth / 2;
+            let topPos = canvas.clientHeight * signaturePos.y;
+
+            // Clamp position to visible area
+            leftPos = Math.max(0, Math.min(leftPos, canvas.clientWidth - overlayWidth));
+            topPos = Math.max(0, Math.min(topPos, canvas.clientHeight - 100)); // 100px min height for overlay
+
+            overlay.style.left = leftPos + 'px';
+            overlay.style.top = topPos + 'px';
+            overlay.style.position = 'absolute';
+
+            // Update signaturePos with clamped values
+            signaturePos.x = (leftPos + overlayWidth / 2) / canvas.clientWidth;
+            signaturePos.y = topPos / canvas.clientHeight;
+
+            console.log('Overlay positioniert bei:', overlay.style.left, overlay.style.top);
+            console.log('Canvas Größe:', canvas.clientWidth, 'x', canvas.clientHeight);
+            console.log('Overlay sichtbar:', overlay.classList.contains('show'));
+        } else {
+            console.error('Canvas nicht gefunden oder noch nicht geladen');
+            // Retry after a bit longer delay
+            setTimeout(() => {
+                const canvas = document.getElementById('pdfCanvas');
+                if (canvas && canvas.clientWidth > 0) {
+                    const overlayWidth = 250;
+                    // Calculate position and ensure it's within bounds
+                    let leftPos = canvas.clientWidth * signaturePos.x - overlayWidth / 2;
+                    let topPos = canvas.clientHeight * signaturePos.y;
+
+                    // Clamp position to visible area
+                    leftPos = Math.max(0, Math.min(leftPos, canvas.clientWidth - overlayWidth));
+                    topPos = Math.max(0, Math.min(topPos, canvas.clientHeight - 100));
+
+                    overlay.style.left = leftPos + 'px';
+                    overlay.style.top = topPos + 'px';
+                    overlay.style.position = 'absolute';
+
+                    // Update signaturePos with clamped values
+                    signaturePos.x = (leftPos + overlayWidth / 2) / canvas.clientWidth;
+                    signaturePos.y = topPos / canvas.clientHeight;
+
+                    console.log('Overlay positioniert (2. Versuch) bei:', overlay.style.left, overlay.style.top);
+                }
+            }, 500);
+        }
+    }, 200);
 }
 
-function makeDraggable(element) {
+// Dragging state (shared across calls)
-    let isDragging = false;
+let isDragging = false;
-    let startX, startY, initialX, initialY;
+let isResizing = false;
+let dragStartX, dragStartY, dragInitialX, dragInitialY;
+let resizeStartX, resizeStartWidth;
 
-    element.addEventListener('mousedown', (e) => {
+// Initialize dragging/resizing once
+let dragInitialized = false;
+
+function initializeDragAndResize() {
+    if (dragInitialized) return; // Only initialize once
+
+    const overlay = document.getElementById('signatureOverlay');
+    const resizeHandle = document.getElementById('resizeHandle');
+
+    if (!overlay || !resizeHandle) return;
+
+    // Make draggable
+    overlay.addEventListener('mousedown', (e) => {
         if (e.target.classList.contains('resize-handle') || e.target.classList.contains('handle')) {
             return;
         }
         isDragging = true;
-        startX = e.clientX;
+        dragStartX = e.clientX;
-        startY = e.clientY;
+        dragStartY = e.clientY;
-        initialX = element.offsetLeft;
+        dragInitialX = overlay.offsetLeft;
-        initialY = element.offsetTop;
+        dragInitialY = overlay.offsetTop;
-        element.style.cursor = 'grabbing';
+        overlay.style.cursor = 'grabbing';
     });
 
     document.addEventListener('mousemove', (e) => {
-        if (!isDragging) return;
+        if (isDragging && overlay.classList.contains('show')) {
+            const dx = e.clientX - dragStartX;
+            const dy = e.clientY - dragStartY;
+            overlay.style.left = (dragInitialX + dx) + 'px';
+            overlay.style.top = (dragInitialY + dy) + 'px';
+        }
 
-        const dx = e.clientX - startX;
+        if (isResizing && overlay.classList.contains('show')) {
-        const dy = e.clientY - startY;
+            const dx = e.clientX - resizeStartX;
-
+            const newWidth = Math.max(100, resizeStartWidth + dx);
-        element.style.left = (initialX + dx) + 'px';
+            overlay.querySelector('img').style.maxWidth = newWidth + 'px';
-        element.style.top = (initialY + dy) + 'px';
+        }
     });
 
     document.addEventListener('mouseup', () => {
         if (isDragging) {
             isDragging = false;
-            element.style.cursor = 'move';
+            overlay.style.cursor = 'move';
             updateSignaturePosition();
         }
-    });
-}
-
-function makeResizable(element) {
-    const resizeHandle = document.getElementById('resizeHandle');
-    let isResizing = false;
-    let startX, startWidth;
-
-    resizeHandle.addEventListener('mousedown', (e) => {
-        e.stopPropagation();
-        isResizing = true;
-        startX = e.clientX;
-        startWidth = element.querySelector('img').width;
-    });
-
-    document.addEventListener('mousemove', (e) => {
-        if (!isResizing) return;
-
-        const dx = e.clientX - startX;
-        const newWidth = Math.max(100, startWidth + dx);
-        element.querySelector('img').style.maxWidth = newWidth + 'px';
-    });
-
-    document.addEventListener('mouseup', () => {
         if (isResizing) {
             isResizing = false;
             updateSignatureScale();
         }
     });
+
+    // Make resizable
+    resizeHandle.addEventListener('mousedown', (e) => {
+        e.stopPropagation();
+        isResizing = true;
+        resizeStartX = e.clientX;
+        resizeStartWidth = overlay.querySelector('img').width;
+    });
+
+    dragInitialized = true;
+}
+
+function makeDraggable(element) {
+    // Function kept for compatibility, but actual initialization is in initializeDragAndResize
+}
+
+function makeResizable(element) {
+    // Function kept for compatibility, but actual initialization is in initializeDragAndResize
 }
 
 function updateSignaturePosition() {
     const overlay = document.getElementById('signatureOverlay');
     const canvas = document.getElementById('pdfCanvas');
 
-    signaturePos.x = overlay.offsetLeft / canvas.width;
+    // Use clientWidth/clientHeight instead of width/height (display size vs internal size)
-    signaturePos.y = overlay.offsetTop / canvas.height;
+    const canvasDisplayWidth = canvas.clientWidth || canvas.width;
-    console.log('Neue Position:', signaturePos);
+    const canvasDisplayHeight = canvas.clientHeight || canvas.height;
+
+    if (canvasDisplayWidth > 0 && canvasDisplayHeight > 0) {
+        signaturePos.x = overlay.offsetLeft / canvasDisplayWidth;
+        signaturePos.y = overlay.offsetTop / canvasDisplayHeight;
+        console.log('Neue Position:', signaturePos, 'Canvas Display:', canvasDisplayWidth, 'x', canvasDisplayHeight);
+    } else {
+        console.error('Canvas Display Größe ist 0!');
+    }
 }
 
 function updateSignatureScale() {
@@ -527,16 +848,39 @@ async function addSignatureToPdf() {
 
 function removeSignatureOverlay() {
     // Only remove the overlay, keep signedPdfBytes intact
-    document.getElementById('signatureOverlay').classList.remove('show');
+    const overlay = document.getElementById('signatureOverlay');
+    overlay.classList.remove('show');
+    overlay.style.display = 'none'; // Explicitly hide overlay
     document.getElementById('signatureControls').classList.remove('show');
+
+    // Reset placeholder to default state
+    const placeholder = document.getElementById('signaturePlaceholder');
+    const placeholderImg = document.getElementById('placeholderSignatureImage');
+    const placeholderContent = document.getElementById('placeholderContent');
+    placeholderImg.style.display = 'none';
+    placeholderContent.style.display = 'flex';
+    placeholder.style.display = 'block';
+
     signatureDataUrl = null;
     console.log('removeSignatureOverlay() aufgerufen - signedPdfBytes:', signedPdfBytes ? signedPdfBytes.length + ' bytes' : 'NULL');
 }
 
 function removeSignature() {
     // Complete reset including signedPdfBytes
-    document.getElementById('signatureOverlay').classList.remove('show');
+    const overlay = document.getElementById('signatureOverlay');
+    overlay.classList.remove('show');
+    overlay.style.display = 'none'; // Explicitly hide overlay
     document.getElementById('signatureControls').classList.remove('show');
+
+    // Reset placeholder to default state
+    const placeholder = document.getElementById('signaturePlaceholder');
+    const placeholderImg = document.getElementById('placeholderSignatureImage');
+    const placeholderContent = document.getElementById('placeholderContent');
+    placeholder.style.display = 'block';
+    placeholderImg.style.display = 'none';
+    placeholderImg.src = '';
+    placeholderContent.style.display = 'flex';
+
     document.getElementById('statusMessage').className = 'status waiting';
     document.getElementById('statusMessage').textContent = 'Warte auf Unterschrift von der Signatur-Station...';
     document.getElementById('downloadButton').disabled = true;
@@ -753,5 +1097,20 @@ document.getElementById('discardButton').addEventListener('click', () => {
     }
 });
 
+// Initialize drag and resize on load
+initializeDragAndResize();
+
+// Add Enter key handler for jump to page input
+document.addEventListener('DOMContentLoaded', () => {
+    const jumpInput = document.getElementById('jumpToPageInput');
+    if (jumpInput) {
+        jumpInput.addEventListener('keypress', (e) => {
+            if (e.key === 'Enter') {
+                jumpToPage();
+            }
+        });
+    }
+});
+
 // Connect WebSocket on load
 connectWebSocket();