diff --git a/themes/Ying/assets/css/main.css b/themes/Ying/assets/css/main.css
index 2df7161c..a6cd0dad 100644
--- a/themes/Ying/assets/css/main.css
+++ b/themes/Ying/assets/css/main.css
@@ -2941,9 +2941,11 @@ img[atk-emoticon] {
 /* Fix Artalk comment textarea color in light mode */
 .atk-textarea {
     color: #1a1a1a !important;
+    background: #fff !important;
 }
 [data-theme="dark"] .atk-textarea {
     color: #e5e7eb !important;
+    background: transparent !important;
 }
 
 /* About Page Card Style */
@@ -2959,6 +2961,108 @@ img[atk-emoticon] {
     box-shadow: none !important;
 }
 
+/* Selection Popup (Quote Button) */
+#selection-popup {
+    position: fixed;
+    display: none;
+    background: rgba(30, 30, 30, 0.9);
+    color: #fff;
+    padding: 8px 16px;
+    border-radius: 8px;
+    font-size: 14px;
+    cursor: pointer;
+    z-index: 2147483647;
+    transform: translate(-50%, -100%);
+    pointer-events: auto;
+    /* Removed backdrop-filter for performance */
+    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
+    transition: opacity 0.2s, transform 0.2s;
+    font-weight: 500;
+    line-height: 1.4;
+    user-select: none;
+    -webkit-user-select: none;
+    align-items: center;
+    gap: 6px;
+    white-space: nowrap;
+    will-change: transform, opacity;
+    animation: popIn 0.2s cubic-bezier(0.18, 0.89, 0.32, 1.28);
+}
+
+@keyframes popIn {
+    0% { transform: translate(-50%, -80%) scale(0.9); opacity: 0; }
+    100% { transform: translate(-50%, -100%) scale(1); opacity: 1; }
+}
+
+#selection-popup i {
+    font-size: 16px;
+}
+
+#selection-popup::after {
+    content: '';
+    position: absolute;
+    top: 100%;
+    left: 50%;
+    margin-left: -6px;
+    border-width: 6px;
+    border-style: solid;
+    border-color: rgba(30, 30, 30, 0.9) transparent transparent transparent;
+}
+
+#selection-popup:hover {
+    transform: translate(-50%, -110%) scale(1.05);
+    background: #000;
+    box-shadow: 0 6px 16px rgba(0,0,0,0.25);
+}
+
+[data-theme="dark"] #selection-popup {
+    background: rgba(255, 255, 255, 0.95);
+    color: #000;
+    box-shadow: 0 4px 12px rgba(0,0,0,0.3);
+}
+
+[data-theme="dark"] #selection-popup::after {
+    border-color: rgba(255, 255, 255, 0.95) transparent transparent transparent;
+}
+
+[data-theme="dark"] #selection-popup:hover {
+    background: #fff;
+}
+
+/* Artalk Comment Blockquote Redesign & Dark Mode Fix */
+.atk-content blockquote {
+    margin: 10px 0 6px 0; /* Reduced bottom margin for tighter layout */
+    padding: 12px 16px;
+    background-color: var(--bankuai-color);
+    border-left: 4px solid var(--text-highlight-color);
+    border-radius: 4px;
+    color: var(--text-content-color);
+    position: relative;
+    font-style: normal;
+    font-weight: normal;
+    transition: all 0.3s ease;
+}
+
+.atk-content blockquote + p {
+    margin-top: 4px !important; /* Reduce spacing for paragraph immediately following blockquote */
+}
+
+.atk-content blockquote p {
+    margin: 0;
+    color: inherit !important;
+    font-size: 0.95rem !important;
+    line-height: 1.6 !important;
+}
+
+[data-theme="dark"] .atk-content blockquote {
+    background-color: rgba(255, 255, 255, 0.05);
+    border-left-color: #4b5563; /* Use a slightly lighter gray for border in dark mode */
+    color: var(--text-content-dark-color);
+}
+
+[data-theme="dark"] .atk-content blockquote p {
+    color: inherit !important;
+}
+
 /* Category Page Styles */
 .category-container {
     max-width: 100%;
diff --git a/themes/Ying/assets/js/main.js b/themes/Ying/assets/js/main.js
index 4661af95..8854b0ee 100644
--- a/themes/Ying/assets/js/main.js
+++ b/themes/Ying/assets/js/main.js
@@ -366,8 +366,141 @@ function initFloatingTools() {
 // Listen for PJAX complete to update visibility
 document.addEventListener('pjax:complete', function() {
     updateFloatingToolsVisibility();
+    hideSelectionPopup();
 });
 
 document.addEventListener('DOMContentLoaded', function() {
     initFloatingTools();
+    initSelectionPopup();
 });
+
+// Selection Popup Logic
+let selectionPopup = null;
+let selectionTimeout;
+
+function initSelectionPopup() {
+    if (document.getElementById('selection-popup')) return;
+
+    selectionPopup = document.createElement('div');
+    selectionPopup.id = 'selection-popup';
+    selectionPopup.innerHTML = '<i class="ri-chat-quote-line"></i> <span>引用评论</span>';
+    document.body.appendChild(selectionPopup);
+
+    // Prevent mousedown on popup from clearing selection
+    selectionPopup.addEventListener('mousedown', function(e) {
+        e.preventDefault();
+        e.stopPropagation();
+    });
+
+    // Handle click on popup
+    selectionPopup.addEventListener('click', function(e) {
+        e.preventDefault();
+        e.stopPropagation();
+        
+        let selection = window.getSelection().toString();
+        // Optimize: Remove extra whitespace and limit length
+        if (selection) {
+            // Collapse multiple empty lines into max 2 newlines, and trim each line
+            selection = selection.split('\n')
+                .map(line => line.trim())
+                .filter(line => line !== '')
+                .join('\n');
+                
+            if (selection.length > 500) {
+                 selection = selection.substring(0, 500) + '...';
+            }
+
+            scrollToCommentsAndQuote(selection);
+            hideSelectionPopup();
+            window.getSelection().removeAllRanges();
+        }
+    });
+
+    // Global listeners for selection
+    document.addEventListener('mouseup', handleSelectionChange);
+    document.addEventListener('keyup', handleSelectionChange);
+}
+
+function hideSelectionPopup() {
+    if (selectionPopup) {
+        selectionPopup.style.display = 'none';
+    }
+}
+
+function handleSelectionChange(e) {
+    // Debounce to avoid rapid firing
+    clearTimeout(selectionTimeout);
+    selectionTimeout = setTimeout(() => {
+        const selection = window.getSelection();
+        const text = selection.toString().trim();
+        const content = document.querySelector('.post-content'); // Main article container
+        
+        if (!selectionPopup || !content) return;
+
+        // Check if selection is empty
+        if (!text || selection.rangeCount === 0) {
+            hideSelectionPopup();
+            return;
+        }
+
+        const range = selection.getRangeAt(0);
+        
+        // Check if the common ancestor is inside .post-content
+        // Optimization: Check container existence before heavy contains check
+        if (!content.contains(range.commonAncestorContainer)) {
+            hideSelectionPopup();
+            return;
+        }
+
+        // Optimization: Use requestAnimationFrame for UI updates
+        requestAnimationFrame(() => {
+            // Show first to ensure measurements if needed (though we set top/left directly)
+            selectionPopup.style.display = 'flex'; 
+
+            // Position logic: Follow mouse if available (mouseup), else fallback to selection rect (keyup)
+            if (e && e.type === 'mouseup') {
+                // Optimization: Avoid getBoundingClientRect on mouseup
+                // Position above the mouse cursor
+                selectionPopup.style.top = `${e.clientY - 40}px`; 
+                selectionPopup.style.left = `${e.clientX}px`;
+            } else {
+                // Fallback for keyboard selection (needs rect)
+                const rect = range.getBoundingClientRect();
+                 // Check if visible and valid
+                if (rect.width === 0 || rect.height === 0) {
+                    hideSelectionPopup();
+                    return;
+                }
+                selectionPopup.style.top = `${rect.top}px`; 
+                selectionPopup.style.left = `${rect.left + rect.width / 2}px`;
+            }
+        });
+    }, 150);
+}
+
+function scrollToCommentsAndQuote(text) {
+    const comments = document.getElementById('Comments');
+    if (comments) {
+        comments.scrollIntoView({ behavior: 'smooth' });
+        
+        // Wait for scroll to complete (approximate)
+        setTimeout(() => {
+             // Find Artalk textarea
+             const textarea = document.querySelector('.atk-textarea');
+             if (textarea) {
+                 const quote = `> ${text}\n\n`;
+                 // Overwrite existing content as requested
+                 textarea.value = quote;
+                 textarea.focus();
+                 
+                 // Trigger input event for Vue/React binding (Artalk uses Vue)
+                textarea.dispatchEvent(new Event('input', { bubbles: true }));
+                textarea.dispatchEvent(new Event('change', { bubbles: true }));
+                
+                if (window.Qmsg) {
+                    Qmsg.success('引用成功');
+                }
+            }
+       }, 500);
+   }
+}