diff --git a/.obsidian/appearance.json b/.obsidian/appearance.json
index 0245f9c..da2e7bd 100644
--- a/.obsidian/appearance.json
+++ b/.obsidian/appearance.json
@@ -1,4 +1,7 @@
 {
   "theme": "obsidian",
-  "accentColor": "#5c82f5"
+  "accentColor": "#5c82f5",
+  "enabledCssSnippets": [
+    "PDF-DarkMode"
+  ]
 }
\ No newline at end of file
diff --git a/.obsidian/snippets/PDF-DarkMode.css b/.obsidian/snippets/PDF-DarkMode.css
new file mode 100644
index 0000000..8bab97c
--- /dev/null
+++ b/.obsidian/snippets/PDF-DarkMode.css
@@ -0,0 +1,14 @@
+/* 针对新版 Obsidian：在深色模式下强制反转 PDF 页面和画布 */
+
+.theme-dark .workspace-leaf-content[data-type="pdf"] .page,
+.theme-dark .internal-embed[src$=".pdf"] .page,
+.theme-dark .pdf-viewer canvas,
+.theme-dark .pdf-embed canvas {
+    filter: invert(100%) hue-rotate(180deg) brightness(85%) contrast(110%) !important;
+}
+
+/* 顺便把 PDF 页面之间的缝隙背景也调暗，防刺眼 */
+.theme-dark .workspace-leaf-content[data-type="pdf"] .view-content,
+.theme-dark .pdf-container {
+    background-color: #1e1e1e !important;
+}