diff --git a/CMakeLists.txt b/CMakeLists.txt
index f0dba817..c642d0d6 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -297,6 +297,17 @@ target_precompile_headers(lemon PUBLIC ${CMAKE_SOURCE_DIR}/src/pch.h)
 
 target_link_libraries(lemon PRIVATE ${LEMON_QT_LIBS} lemon-core lemon-base SingleApplication::SingleApplication spdlog::spdlog)
 
+# Linking this static Qt plugin also imports its generated registration object.
+find_package(${LEMON_QT_LIBNAME} COMPONENTS Svg REQUIRED)
+qt_add_plugin(lemon-svg-icon STATIC
+    PLUGIN_TYPE iconengines
+    CLASS_NAME LemonSvgIconPlugin
+    src/plugins/lemonsvgiconplugin.cpp
+    src/plugins/lemonsvgiconplugin.json
+    )
+target_link_libraries(lemon-svg-icon PRIVATE ${LEMON_QT_LIBNAME}::Gui ${LEMON_QT_LIBNAME}::Svg)
+target_link_libraries(lemon PRIVATE lemon-svg-icon)
+
 if(ENABLE_LTO)
     include(CheckIPOSupported)
     check_ipo_supported(RESULT LTO_SUPPORTED OUTPUT error)
diff --git a/assets/pics/acrobat.svg b/assets/pics/acrobat.svg
index bde6bc15..4144418c 100644
--- a/assets/pics/acrobat.svg
+++ b/assets/pics/acrobat.svg
@@ -1,3 +1,5 @@
-<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24"><g transform="translate(1,1)">
- <path d="m330 537.3622v10l3-2 3 2v-10h-6m7 0v1h6v10h-4v1 3h-8v-4h-1v5h1 8 1v-.001l.008.001 3.99219-3.99219v-.008-1.40625-10.59375h-1-6zm-4 3h2c-2 3-4 4-4 4 0 0 1-4 2-4" transform="translate(-326-534.3622)" style="fill:#d24d57"/>
-</g></svg>
+<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24">
+ <style type="text/css" id="current-color-scheme">.ColorScheme-NegativeText{color:#d24d57;}</style>
+<g transform="translate(1,1)">
+ <path d="m330 537.3622v10l3-2 3 2v-10h-6m7 0v1h6v10h-4v1 3h-8v-4h-1v5h1 8 1v-.001l.008.001 3.99219-3.99219v-.008-1.40625-10.59375h-1-6zm-4 3h2c-2 3-4 4-4 4 0 0 1-4 2-4" transform="translate(-326-534.3622)" class="ColorScheme-NegativeText" style="fill:currentColor"/>
+</g></svg>
diff --git a/assets/pics/list-add.svg b/assets/pics/list-add.svg
index 8779062a..ce2b1fff 100644
--- a/assets/pics/list-add.svg
+++ b/assets/pics/list-add.svg
@@ -7,7 +7,7 @@
       </style>
   </defs>
  <path style="fill:currentColor;fill-opacity:1;stroke:none" 
-     d="M 7 3.0058594 L 7 8 L 2 8 L 2 8.9980469 L 7 8.9980469 L 7 14.007812 L 8 14.007812 L 8 8.9980469 L 13 8.9980469 L 13 8 L 8 8 L 8 3.0058594 L 7 3.0058594 z "
+     d="M 7 3 H 9 V 7 H 13 V 9 H 9 V 13 H 7 V 9 H 3 V 7 H 7 Z"
      class="ColorScheme-Text"
      />
 </svg>
diff --git a/assets/pics/list-remove.svg b/assets/pics/list-remove.svg
index dd977fe0..f3f70cf1 100644
--- a/assets/pics/list-remove.svg
+++ b/assets/pics/list-remove.svg
@@ -7,7 +7,7 @@
       </style>
   </defs>
  <path style="fill:currentColor;fill-opacity:1;stroke:none" 
-     d="M 3,7 3,9 13,9 13,7 3,7 Z"
+     d="M 3 7 H 13 V 9 H 3 Z"
      class="ColorScheme-Text"
      />
 </svg>
diff --git a/resource.qrc b/resource.qrc
index af75dcc7..9c4683af 100755
--- a/resource.qrc
+++ b/resource.qrc
@@ -9,37 +9,37 @@
     </qresource>
     <qresource prefix="/icon">
         <file alias="icon.png">assets/icons/lemon-lime.png</file>
-        <file alias="code-function.svg">assets/pics/code-function.svg</file>
-        <file alias="configure.svg">assets/pics/configure.svg</file>
-        <file alias="dialog-cancel.svg">assets/pics/dialog-cancel.svg</file>
-        <file alias="dialog-ok-apply.svg">assets/pics/dialog-ok-apply.svg</file>
-        <file alias="document-edit.svg">assets/pics/document-edit.svg</file>
-        <file alias="edit-clear.svg">assets/pics/edit-clear.svg</file>
-        <file alias="edit-delete.svg">assets/pics/edit-delete.svg</file>
-        <file alias="edit-find-replace.svg">assets/pics/edit-find-replace.svg</file>
-        <file alias="edit-find.svg">assets/pics/edit-find.svg</file>
-        <file alias="go-down.svg">assets/pics/go-down.svg</file>
-        <file alias="go-up.svg">assets/pics/go-up.svg</file>
-        <file alias="list-add.svg">assets/pics/list-add.svg</file>
-        <file alias="list-remove.svg">assets/pics/list-remove.svg</file>
-        <file alias="media-playback-stop.svg">assets/pics/media-playback-stop.svg</file>
-        <file alias="media-skip-forward.svg">assets/pics/media-skip-forward.svg</file>
-        <file alias="paint-none.svg">assets/pics/paint-none.svg</file>
-        <file alias="view-refresh.svg">assets/pics/view-refresh.svg</file>
-        <file alias="view-sort.svg">assets/pics/view-sort.svg</file>
-        <file alias="application-exit.svg">assets/pics/application-exit.svg</file>
-        <file alias="deletecell.svg">assets/pics/deletecell.svg</file>
-        <file alias="document-close.svg">assets/pics/document-close.svg</file>
-        <file alias="document-export.svg">assets/pics/document-export.svg</file>
-        <file alias="document-new.svg">assets/pics/document-new.svg</file>
-        <file alias="document-save.svg">assets/pics/document-save.svg</file>
-        <file alias="globe.svg">assets/pics/globe.svg</file>
-        <file alias="go-parent-folder.svg">assets/pics/go-parent-folder.svg</file>
-        <file alias="help-about.svg">assets/pics/help-about.svg</file>
-        <file alias="layer-new.svg">assets/pics/layer-new.svg</file>
-        <file alias="paint-unknown.svg">assets/pics/paint-unknown.svg</file>
-        <file alias="quickopen-file.svg">assets/pics/quickopen-file.svg</file>
-        <file alias="system-help.svg">assets/pics/system-help.svg</file>
-        <file alias="acrobat.svg">assets/pics/acrobat.svg</file>
+        <file alias="code-function.llsvg">assets/pics/code-function.svg</file>
+        <file alias="configure.llsvg">assets/pics/configure.svg</file>
+        <file alias="dialog-cancel.llsvg">assets/pics/dialog-cancel.svg</file>
+        <file alias="dialog-ok-apply.llsvg">assets/pics/dialog-ok-apply.svg</file>
+        <file alias="document-edit.llsvg">assets/pics/document-edit.svg</file>
+        <file alias="edit-clear.llsvg">assets/pics/edit-clear.svg</file>
+        <file alias="edit-delete.llsvg">assets/pics/edit-delete.svg</file>
+        <file alias="edit-find-replace.llsvg">assets/pics/edit-find-replace.svg</file>
+        <file alias="edit-find.llsvg">assets/pics/edit-find.svg</file>
+        <file alias="go-down.llsvg">assets/pics/go-down.svg</file>
+        <file alias="go-up.llsvg">assets/pics/go-up.svg</file>
+        <file alias="list-add.llsvg">assets/pics/list-add.svg</file>
+        <file alias="list-remove.llsvg">assets/pics/list-remove.svg</file>
+        <file alias="media-playback-stop.llsvg">assets/pics/media-playback-stop.svg</file>
+        <file alias="media-skip-forward.llsvg">assets/pics/media-skip-forward.svg</file>
+        <file alias="paint-none.llsvg">assets/pics/paint-none.svg</file>
+        <file alias="view-refresh.llsvg">assets/pics/view-refresh.svg</file>
+        <file alias="view-sort.llsvg">assets/pics/view-sort.svg</file>
+        <file alias="application-exit.llsvg">assets/pics/application-exit.svg</file>
+        <file alias="deletecell.llsvg">assets/pics/deletecell.svg</file>
+        <file alias="document-close.llsvg">assets/pics/document-close.svg</file>
+        <file alias="document-export.llsvg">assets/pics/document-export.svg</file>
+        <file alias="document-new.llsvg">assets/pics/document-new.svg</file>
+        <file alias="document-save.llsvg">assets/pics/document-save.svg</file>
+        <file alias="globe.llsvg">assets/pics/globe.svg</file>
+        <file alias="go-parent-folder.llsvg">assets/pics/go-parent-folder.svg</file>
+        <file alias="help-about.llsvg">assets/pics/help-about.svg</file>
+        <file alias="layer-new.llsvg">assets/pics/layer-new.svg</file>
+        <file alias="paint-unknown.llsvg">assets/pics/paint-unknown.svg</file>
+        <file alias="quickopen-file.llsvg">assets/pics/quickopen-file.svg</file>
+        <file alias="system-help.llsvg">assets/pics/system-help.svg</file>
+        <file alias="acrobat.llsvg">assets/pics/acrobat.svg</file>
     </qresource>
 </RCC>
diff --git a/src/forms/addtestcaseswizard.ui b/src/forms/addtestcaseswizard.ui
index 336e0314..a48a9874 100755
--- a/src/forms/addtestcaseswizard.ui
+++ b/src/forms/addtestcaseswizard.ui
@@ -415,7 +415,7 @@
           </property>
           <property name="icon">
            <iconset resource="../../resource.qrc">
-            <normaloff>:/icon/list-add.svg</normaloff>:/icon/list-add.svg</iconset>
+            <normaloff>:/icon/list-add.llsvg</normaloff>:/icon/list-add.llsvg</iconset>
           </property>
          </widget>
         </item>
@@ -438,7 +438,7 @@
           </property>
           <property name="icon">
            <iconset resource="../../resource.qrc">
-            <normaloff>:/icon/list-remove.svg</normaloff>:/icon/list-remove.svg</iconset>
+            <normaloff>:/icon/list-remove.llsvg</normaloff>:/icon/list-remove.llsvg</iconset>
           </property>
          </widget>
         </item>
diff --git a/src/forms/advancedcompilersettingsdialog.ui b/src/forms/advancedcompilersettingsdialog.ui
index 28f0cece..c42f4706 100755
--- a/src/forms/advancedcompilersettingsdialog.ui
+++ b/src/forms/advancedcompilersettingsdialog.ui
@@ -339,7 +339,7 @@
         </property>
         <property name="icon">
          <iconset resource="../../resource.qrc">
-          <normaloff>:/icon/edit-delete.svg</normaloff>:/icon/edit-delete.svg</iconset>
+          <normaloff>:/icon/edit-delete.llsvg</normaloff>:/icon/edit-delete.llsvg</iconset>
         </property>
        </widget>
       </item>
diff --git a/src/forms/compilersettings.ui b/src/forms/compilersettings.ui
index b498202e..6147a493 100755
--- a/src/forms/compilersettings.ui
+++ b/src/forms/compilersettings.ui
@@ -77,7 +77,7 @@
          </property>
          <property name="icon">
           <iconset resource="../../resource.qrc">
-           <normaloff>:/icon/go-up.svg</normaloff>:/icon/go-up.svg</iconset>
+           <normaloff>:/icon/go-up.llsvg</normaloff>:/icon/go-up.llsvg</iconset>
          </property>
          <property name="autoRaise">
           <bool>false</bool>
@@ -106,7 +106,7 @@
          </property>
          <property name="icon">
           <iconset resource="../../resource.qrc">
-           <normaloff>:/icon/go-down.svg</normaloff>:/icon/go-down.svg</iconset>
+           <normaloff>:/icon/go-down.llsvg</normaloff>:/icon/go-down.llsvg</iconset>
          </property>
          <property name="autoRaise">
           <bool>false</bool>
@@ -148,7 +148,7 @@
          </property>
          <property name="icon">
           <iconset resource="../../resource.qrc">
-           <normaloff>:/icon/list-add.svg</normaloff>:/icon/list-add.svg</iconset>
+           <normaloff>:/icon/list-add.llsvg</normaloff>:/icon/list-add.llsvg</iconset>
          </property>
          <property name="autoRaise">
           <bool>false</bool>
@@ -177,7 +177,7 @@
          </property>
          <property name="icon">
           <iconset resource="../../resource.qrc">
-           <normaloff>:/icon/list-remove.svg</normaloff>:/icon/list-remove.svg</iconset>
+           <normaloff>:/icon/list-remove.llsvg</normaloff>:/icon/list-remove.llsvg</iconset>
          </property>
          <property name="autoRaise">
           <bool>false</bool>
diff --git a/src/forms/detaildialog.ui b/src/forms/detaildialog.ui
index 7c26f483..19c4843f 100755
--- a/src/forms/detaildialog.ui
+++ b/src/forms/detaildialog.ui
@@ -56,7 +56,7 @@
        </property>
        <property name="icon">
         <iconset resource="../../resource.qrc">
-         <normaloff>:/icon/paint-none.svg</normaloff>:/icon/paint-none.svg</iconset>
+         <normaloff>:/icon/paint-none.llsvg</normaloff>:/icon/paint-none.llsvg</iconset>
        </property>
       </widget>
      </item>
diff --git a/src/forms/environmentvariablesdialog.ui b/src/forms/environmentvariablesdialog.ui
index e023aaba..199957d7 100755
--- a/src/forms/environmentvariablesdialog.ui
+++ b/src/forms/environmentvariablesdialog.ui
@@ -83,7 +83,7 @@
        </property>
        <property name="icon">
         <iconset resource="../../resource.qrc">
-         <normaloff>:/icon/list-add.svg</normaloff>:/icon/list-add.svg</iconset>
+         <normaloff>:/icon/list-add.llsvg</normaloff>:/icon/list-add.llsvg</iconset>
        </property>
       </widget>
      </item>
@@ -102,7 +102,7 @@
        </property>
        <property name="icon">
         <iconset resource="../../resource.qrc">
-         <normaloff>:/icon/document-edit.svg</normaloff>:/icon/document-edit.svg</iconset>
+         <normaloff>:/icon/document-edit.llsvg</normaloff>:/icon/document-edit.llsvg</iconset>
        </property>
       </widget>
      </item>
@@ -121,7 +121,7 @@
        </property>
        <property name="icon">
         <iconset resource="../../resource.qrc">
-         <normaloff>:/icon/edit-delete.svg</normaloff>:/icon/edit-delete.svg</iconset>
+         <normaloff>:/icon/edit-delete.llsvg</normaloff>:/icon/edit-delete.llsvg</iconset>
        </property>
       </widget>
      </item>
diff --git a/src/forms/judgingdialog.ui b/src/forms/judgingdialog.ui
index 24489131..6bb5f80d 100755
--- a/src/forms/judgingdialog.ui
+++ b/src/forms/judgingdialog.ui
@@ -115,7 +115,7 @@
        </property>
        <property name="icon">
         <iconset resource="../../resource.qrc">
-         <normaloff>:/icon/media-skip-forward.svg</normaloff>:/icon/media-skip-forward.svg</iconset>
+         <normaloff>:/icon/media-skip-forward.llsvg</normaloff>:/icon/media-skip-forward.llsvg</iconset>
        </property>
        <property name="autoDefault">
         <bool>false</bool>
@@ -156,7 +156,7 @@
        </property>
        <property name="icon">
         <iconset resource="../../resource.qrc">
-         <normaloff>:/icon/media-playback-stop.svg</normaloff>:/icon/media-playback-stop.svg</iconset>
+         <normaloff>:/icon/media-playback-stop.llsvg</normaloff>:/icon/media-playback-stop.llsvg</iconset>
        </property>
        <property name="autoDefault">
         <bool>false</bool>
diff --git a/src/forms/lemon.ui b/src/forms/lemon.ui
index 1c9a8fd0..3878b42d 100755
--- a/src/forms/lemon.ui
+++ b/src/forms/lemon.ui
@@ -135,7 +135,7 @@
                </property>
                <property name="icon">
                 <iconset resource="../../resource.qrc">
-                 <normaloff>:/icon/go-down.svg</normaloff>:/icon/go-down.svg</iconset>
+                 <normaloff>:/icon/go-down.llsvg</normaloff>:/icon/go-down.llsvg</iconset>
                </property>
               </widget>
              </item>
@@ -149,7 +149,7 @@
                </property>
                <property name="icon">
                 <iconset resource="../../resource.qrc">
-                 <normaloff>:/icon/go-up.svg</normaloff>:/icon/go-up.svg</iconset>
+                 <normaloff>:/icon/go-up.llsvg</normaloff>:/icon/go-up.llsvg</iconset>
                </property>
               </widget>
              </item>
@@ -281,7 +281,7 @@
             </property>
             <property name="icon">
              <iconset resource="../../resource.qrc">
-              <normaloff>:/icon/view-sort.svg</normaloff>:/icon/view-sort.svg</iconset>
+              <normaloff>:/icon/view-sort.llsvg</normaloff>:/icon/view-sort.llsvg</iconset>
             </property>
            </widget>
           </item>
@@ -320,7 +320,7 @@
             </property>
             <property name="icon">
              <iconset resource="../../resource.qrc">
-              <normaloff>:/icon/view-refresh.svg</normaloff>:/icon/view-refresh.svg</iconset>
+              <normaloff>:/icon/view-refresh.llsvg</normaloff>:/icon/view-refresh.llsvg</iconset>
             </property>
            </widget>
           </item>
@@ -352,7 +352,7 @@
             </property>
             <property name="icon">
              <iconset resource="../../resource.qrc">
-              <normaloff>:/icon/edit-find-replace.svg</normaloff>:/icon/edit-find-replace.svg</iconset>
+              <normaloff>:/icon/edit-find-replace.llsvg</normaloff>:/icon/edit-find-replace.llsvg</iconset>
             </property>
            </widget>
           </item>
@@ -381,7 +381,7 @@
             </property>
             <property name="icon">
              <iconset resource="../../resource.qrc">
-              <normaloff>:/icon/edit-find.svg</normaloff>:/icon/edit-find.svg</iconset>
+              <normaloff>:/icon/edit-find.llsvg</normaloff>:/icon/edit-find.llsvg</iconset>
             </property>
            </widget>
           </item>
@@ -410,7 +410,7 @@
             </property>
             <property name="icon">
              <iconset resource="../../resource.qrc">
-              <normaloff>:/icon/code-function.svg</normaloff>:/icon/code-function.svg</iconset>
+              <normaloff>:/icon/code-function.llsvg</normaloff>:/icon/code-function.llsvg</iconset>
             </property>
            </widget>
           </item>
@@ -520,7 +520,7 @@
      </property>
      <property name="icon">
       <iconset resource="../../resource.qrc">
-       <normaloff>:/icon/system-help.svg</normaloff>:/icon/system-help.svg</iconset>
+       <normaloff>:/icon/system-help.llsvg</normaloff>:/icon/system-help.llsvg</iconset>
      </property>
      <addaction name="actionManual"/>
      <addaction name="separator"/>
@@ -539,7 +539,7 @@
   <action name="newAction">
    <property name="icon">
     <iconset resource="../../resource.qrc">
-     <normaloff>:/icon/document-new.svg</normaloff>:/icon/document-new.svg</iconset>
+     <normaloff>:/icon/document-new.llsvg</normaloff>:/icon/document-new.llsvg</iconset>
    </property>
    <property name="text">
     <string>&amp;New Contest</string>
@@ -551,7 +551,7 @@
   <action name="openAction">
    <property name="icon">
     <iconset resource="../../resource.qrc">
-     <normaloff>:/icon/quickopen-file.svg</normaloff>:/icon/quickopen-file.svg</iconset>
+     <normaloff>:/icon/quickopen-file.llsvg</normaloff>:/icon/quickopen-file.llsvg</iconset>
    </property>
    <property name="text">
     <string>&amp;Open Existing Contest</string>
@@ -563,7 +563,7 @@
   <action name="exitAction">
    <property name="icon">
     <iconset resource="../../resource.qrc">
-     <normaloff>:/icon/application-exit.svg</normaloff>:/icon/application-exit.svg</iconset>
+     <normaloff>:/icon/application-exit.llsvg</normaloff>:/icon/application-exit.llsvg</iconset>
    </property>
    <property name="text">
     <string>E&amp;xit</string>
@@ -575,7 +575,7 @@
   <action name="optionsAction">
    <property name="icon">
     <iconset resource="../../resource.qrc">
-     <normaloff>:/icon/configure.svg</normaloff>:/icon/configure.svg</iconset>
+     <normaloff>:/icon/configure.llsvg</normaloff>:/icon/configure.llsvg</iconset>
    </property>
    <property name="text">
     <string>&amp;Settings</string>
@@ -587,7 +587,7 @@
   <action name="aboutAction">
    <property name="icon">
     <iconset resource="../../resource.qrc">
-     <normaloff>:/icon/help-about.svg</normaloff>:/icon/help-about.svg</iconset>
+     <normaloff>:/icon/help-about.llsvg</normaloff>:/icon/help-about.llsvg</iconset>
    </property>
    <property name="text">
     <string>&amp;About</string>
@@ -602,7 +602,7 @@
    </property>
    <property name="icon">
     <iconset resource="../../resource.qrc">
-     <normaloff>:/icon/edit-find.svg</normaloff>:/icon/edit-find.svg</iconset>
+     <normaloff>:/icon/edit-find.llsvg</normaloff>:/icon/edit-find.llsvg</iconset>
    </property>
    <property name="text">
     <string>&amp;Judge Selected</string>
@@ -617,7 +617,7 @@
    </property>
    <property name="icon">
     <iconset resource="../../resource.qrc">
-     <normaloff>:/icon/code-function.svg</normaloff>:/icon/code-function.svg</iconset>
+     <normaloff>:/icon/code-function.llsvg</normaloff>:/icon/code-function.llsvg</iconset>
    </property>
    <property name="text">
     <string>Judge &amp;All</string>
@@ -629,7 +629,7 @@
   <action name="closeAction">
    <property name="icon">
     <iconset resource="../../resource.qrc">
-     <normaloff>:/icon/document-close.svg</normaloff>:/icon/document-close.svg</iconset>
+     <normaloff>:/icon/document-close.llsvg</normaloff>:/icon/document-close.llsvg</iconset>
    </property>
    <property name="text">
     <string>&amp;Close Current Contest</string>
@@ -649,7 +649,7 @@
    </property>
    <property name="icon">
     <iconset resource="../../resource.qrc">
-     <normaloff>:/icon/layer-new.svg</normaloff>:/icon/layer-new.svg</iconset>
+     <normaloff>:/icon/layer-new.llsvg</normaloff>:/icon/layer-new.llsvg</iconset>
    </property>
    <property name="text">
     <string>Add &amp;Tasks Automatically</string>
@@ -672,7 +672,7 @@
    </property>
    <property name="icon">
     <iconset resource="../../resource.qrc">
-     <normaloff>:/icon/document-export.svg</normaloff>:/icon/document-export.svg</iconset>
+     <normaloff>:/icon/document-export.llsvg</normaloff>:/icon/document-export.llsvg</iconset>
    </property>
    <property name="text">
     <string>&amp;Export Result</string>
@@ -687,7 +687,7 @@
    </property>
    <property name="icon">
     <iconset resource="../../resource.qrc">
-     <normaloff>:/icon/edit-find-replace.svg</normaloff>:/icon/edit-find-replace.svg</iconset>
+     <normaloff>:/icon/edit-find-replace.llsvg</normaloff>:/icon/edit-find-replace.llsvg</iconset>
    </property>
    <property name="text">
     <string>Judge &amp;Unjudged</string>
@@ -699,7 +699,7 @@
   <action name="openFolderAction">
    <property name="icon">
     <iconset resource="../../resource.qrc">
-     <normaloff>:/icon/go-parent-folder.svg</normaloff>:/icon/go-parent-folder.svg</iconset>
+     <normaloff>:/icon/go-parent-folder.llsvg</normaloff>:/icon/go-parent-folder.llsvg</iconset>
    </property>
    <property name="text">
     <string>Open Current Contest &amp;Folder</string>
@@ -711,7 +711,7 @@
   <action name="saveAction">
    <property name="icon">
     <iconset resource="../../resource.qrc">
-     <normaloff>:/icon/document-save.svg</normaloff>:/icon/document-save.svg</iconset>
+     <normaloff>:/icon/document-save.llsvg</normaloff>:/icon/document-save.llsvg</iconset>
    </property>
    <property name="text">
     <string>&amp;Save Current Contest</string>
@@ -784,7 +784,7 @@
   <action name="actionMore">
    <property name="icon">
     <iconset resource="../../resource.qrc">
-     <normaloff>:/icon/globe.svg</normaloff>:/icon/globe.svg</iconset>
+     <normaloff>:/icon/globe.llsvg</normaloff>:/icon/globe.llsvg</iconset>
    </property>
    <property name="text">
     <string>More</string>
@@ -799,7 +799,7 @@
    </property>
    <property name="icon">
     <iconset resource="../../resource.qrc">
-     <normaloff>:/icon/paint-unknown.svg</normaloff>:/icon/paint-unknown.svg</iconset>
+     <normaloff>:/icon/paint-unknown.llsvg</normaloff>:/icon/paint-unknown.llsvg</iconset>
    </property>
    <property name="text">
     <string>Judge &amp;No Source</string>
@@ -814,7 +814,7 @@
    </property>
    <property name="icon">
     <iconset resource="../../resource.qrc">
-     <normaloff>:/icon/deletecell.svg</normaloff>:/icon/deletecell.svg</iconset>
+     <normaloff>:/icon/deletecell.llsvg</normaloff>:/icon/deletecell.llsvg</iconset>
    </property>
    <property name="text">
     <string>Judge &amp;Compile Failed</string>
@@ -826,7 +826,7 @@
   <action name="actionChangeContestName">
    <property name="icon">
     <iconset resource="../../resource.qrc">
-     <normaloff>:/icon/document-edit.svg</normaloff>:/icon/document-edit.svg</iconset>
+     <normaloff>:/icon/document-edit.llsvg</normaloff>:/icon/document-edit.llsvg</iconset>
    </property>
    <property name="text">
     <string>C&amp;hange Contest Name</string>
@@ -841,7 +841,7 @@
    </property>
    <property name="icon">
     <iconset resource="../../resource.qrc">
-     <normaloff>:/icon/view-sort.svg</normaloff>:/icon/view-sort.svg</iconset>
+     <normaloff>:/icon/view-sort.llsvg</normaloff>:/icon/view-sort.llsvg</iconset>
    </property>
    <property name="text">
     <string>Clean Up &amp;Files</string>
@@ -856,7 +856,7 @@
    </property>
    <property name="icon">
     <iconset resource="../../resource.qrc">
-     <normaloff>:/icon/view-refresh.svg</normaloff>:/icon/view-refresh.svg</iconset>
+     <normaloff>:/icon/view-refresh.llsvg</normaloff>:/icon/view-refresh.llsvg</iconset>
    </property>
    <property name="text">
     <string>&amp;Refresh</string>
@@ -879,7 +879,7 @@
    </property>
    <property name="icon">
     <iconset resource="../../resource.qrc">
-     <normaloff>:/icon/document-export.svg</normaloff>:/icon/document-export.svg</iconset>
+     <normaloff>:/icon/document-export.llsvg</normaloff>:/icon/document-export.llsvg</iconset>
    </property>
    <property name="text">
     <string>Export &amp;Statistics</string>
@@ -888,7 +888,7 @@
   <action name="actionManual">
    <property name="icon">
     <iconset resource="../../resource.qrc">
-     <normaloff>:/icon/acrobat.svg</normaloff>:/icon/acrobat.svg</iconset>
+     <normaloff>:/icon/acrobat.llsvg</normaloff>:/icon/acrobat.llsvg</iconset>
    </property>
    <property name="text">
     <string>Manual</string>
diff --git a/src/forms/opencontestwidget.ui b/src/forms/opencontestwidget.ui
index 29d167e9..d73eb859 100755
--- a/src/forms/opencontestwidget.ui
+++ b/src/forms/opencontestwidget.ui
@@ -147,7 +147,7 @@
          </property>
          <property name="icon">
           <iconset>
-           <normaloff>:/icon/list-add.svg</normaloff>:/icon/list-add.svg</iconset>
+           <normaloff>:/icon/list-add.llsvg</normaloff>:/icon/list-add.llsvg</iconset>
          </property>
          <property name="toolButtonStyle">
           <enum>Qt::ToolButtonTextBesideIcon</enum>
@@ -177,7 +177,7 @@
          </property>
          <property name="icon">
           <iconset>
-           <normaloff>:/icon/list-remove.svg</normaloff>:/icon/list-remove.svg</iconset>
+           <normaloff>:/icon/list-remove.llsvg</normaloff>:/icon/list-remove.llsvg</iconset>
          </property>
          <property name="toolButtonStyle">
           <enum>Qt::ToolButtonTextBesideIcon</enum>
diff --git a/src/forms/taskeditwidget.ui b/src/forms/taskeditwidget.ui
index 4676cf37..cc87ad52 100755
--- a/src/forms/taskeditwidget.ui
+++ b/src/forms/taskeditwidget.ui
@@ -266,7 +266,7 @@
        </property>
        <property name="icon">
         <iconset resource="../../resource.qrc">
-         <normaloff>:/icon/list-add.svg</normaloff>:/icon/list-add.svg</iconset>
+         <normaloff>:/icon/list-add.llsvg</normaloff>:/icon/list-add.llsvg</iconset>
        </property>
       </widget>
      </item>
@@ -282,7 +282,7 @@
        </property>
        <property name="icon">
         <iconset resource="../../resource.qrc">
-         <normaloff>:/icon/list-remove.svg</normaloff>:/icon/list-remove.svg</iconset>
+         <normaloff>:/icon/list-remove.llsvg</normaloff>:/icon/list-remove.llsvg</iconset>
        </property>
       </widget>
      </item>
@@ -822,7 +822,7 @@
        </property>
        <property name="icon">
         <iconset resource="../../resource.qrc">
-         <normaloff>:/icon/list-add.svg</normaloff>:/icon/list-add.svg</iconset>
+         <normaloff>:/icon/list-add.llsvg</normaloff>:/icon/list-add.llsvg</iconset>
        </property>
       </widget>
      </item>
@@ -838,7 +838,7 @@
        </property>
        <property name="icon">
         <iconset resource="../../resource.qrc">
-         <normaloff>:/icon/list-remove.svg</normaloff>:/icon/list-remove.svg</iconset>
+         <normaloff>:/icon/list-remove.llsvg</normaloff>:/icon/list-remove.llsvg</iconset>
        </property>
       </widget>
      </item>
diff --git a/src/forms/testcaseeditwidget.ui b/src/forms/testcaseeditwidget.ui
index c89b96ca..07c3fb30 100755
--- a/src/forms/testcaseeditwidget.ui
+++ b/src/forms/testcaseeditwidget.ui
@@ -184,7 +184,7 @@
          </property>
          <property name="icon">
           <iconset>
-           <normaloff>:/icon/list-add.svg</normaloff>:/icon/list-add.svg</iconset>
+           <normaloff>:/icon/list-add.llsvg</normaloff>:/icon/list-add.llsvg</iconset>
          </property>
         </widget>
        </item>
@@ -247,7 +247,7 @@
          </property>
          <property name="icon">
           <iconset>
-           <normaloff>:/icon/edit-clear.svg</normaloff>:/icon/edit-clear.svg</iconset>
+           <normaloff>:/icon/edit-clear.llsvg</normaloff>:/icon/edit-clear.llsvg</iconset>
          </property>
         </widget>
        </item>
diff --git a/src/forms/visualmainsettings.ui b/src/forms/visualmainsettings.ui
index 1343a281..182ccb13 100644
--- a/src/forms/visualmainsettings.ui
+++ b/src/forms/visualmainsettings.ui
@@ -54,7 +54,7 @@
          </property>
          <property name="icon">
           <iconset resource="../../resource.qrc">
-           <normaloff>:/icon/list-add.svg</normaloff>:/icon/list-add.svg</iconset>
+           <normaloff>:/icon/list-add.llsvg</normaloff>:/icon/list-add.llsvg</iconset>
          </property>
         </widget>
        </item>
@@ -78,7 +78,7 @@
          </property>
          <property name="icon">
           <iconset resource="../../resource.qrc">
-           <normaloff>:/icon/edit-delete.svg</normaloff>:/icon/edit-delete.svg</iconset>
+           <normaloff>:/icon/edit-delete.llsvg</normaloff>:/icon/edit-delete.llsvg</iconset>
          </property>
         </widget>
        </item>
diff --git a/src/plugins/README.md b/src/plugins/README.md
new file mode 100644
index 00000000..4f2188ad
--- /dev/null
+++ b/src/plugins/README.md
@@ -0,0 +1,10 @@
+<!--
+SPDX-FileCopyrightText: 2026 Project LemonLime
+SPDX-License-Identifier: GPL-3.0-or-later
+-->
+
+# SVG icon plugin
+
+本插件参考 KIconThemes 的[语义配色](https://github.com/KDE/kiconthemes/blob/f4f5e4e01c22fba7eff981887c68724b456de2c2/src/kiconcolors.cpp)和 [SVG 样式替换](https://github.com/KDE/kiconthemes/blob/f4f5e4e01c22fba7eff981887c68724b456de2c2/src/kiconloader.cpp)设计。
+
+上游参考文件采用 `LGPL-2.0-only`。本插件为独立实现，采用 `GPL-3.0-or-later`，未引入 KDE 源码或库依赖。
diff --git a/src/plugins/lemonsvgiconplugin.cpp b/src/plugins/lemonsvgiconplugin.cpp
new file mode 100644
index 00000000..133f41d6
--- /dev/null
+++ b/src/plugins/lemonsvgiconplugin.cpp
@@ -0,0 +1,170 @@
+/*
+ * SPDX-FileCopyrightText: 2026 Project LemonLime
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ *
+ * Design reference: KDE KIconThemes, KIconColors::stylesheet() and
+ * KIconLoaderPrivate::processSvg(), revision f4f5e4e01c22fba7eff981887c68724b456de2c2.
+ * Independently implemented here; no KIconThemes source is incorporated.
+ * See README.md in this directory for reference URLs and licensing details.
+ *
+ */
+
+#include <QCryptographicHash>
+#include <QFile>
+#include <QGuiApplication>
+#include <QIconEngine>
+#include <QIconEnginePlugin>
+#include <QPainter>
+#include <QPalette>
+#include <QPixmapCache>
+#include <QSvgRenderer>
+#include <QXmlStreamReader>
+#include <QXmlStreamWriter>
+
+namespace {
+	QString iconStyleSheet(const QPalette &palette, QPalette::ColorGroup group, QIcon::Mode mode) {
+		const QColor text =
+		    palette.color(group, mode == QIcon::Selected ? QPalette::HighlightedText : QPalette::ButtonText);
+		const bool dark = palette.color(group, QPalette::Button).lightness() <
+		                  palette.color(group, QPalette::ButtonText).lightness();
+		const QColor negative = mode == QIcon::Disabled || mode == QIcon::Selected ? text
+		                        : dark                                             ? QColor(255, 128, 139)
+		                                                                           : QColor(218, 68, 83);
+		// Keep application-specific semantic colors here, separate from SVG geometry.
+		return QStringLiteral(".ColorScheme-Text { color: %1; }\n"
+		                      ".ColorScheme-NegativeText { color: %2; }\n")
+		    .arg(text.name(), negative.name());
+	}
+
+	QByteArray applyStyleSheet(const QByteArray &svg, const QString &styleSheet) {
+		QXmlStreamReader reader(svg);
+		QByteArray result;
+		QXmlStreamWriter writer(&result);
+		bool themed = false;
+		while (! reader.atEnd()) {
+			reader.readNext();
+			if (reader.hasError())
+				return {};
+			writer.writeCurrentToken(reader);
+			if (reader.isStartElement() && reader.name() == QLatin1String("style") &&
+			    (reader.namespaceUri().isEmpty() ||
+			     reader.namespaceUri() == QLatin1String("http://www.w3.org/2000/svg")) &&
+			    reader.attributes().value(QLatin1String("id")) == QLatin1String("current-color-scheme")) {
+				writer.writeCharacters(styleSheet);
+				reader.skipCurrentElement();
+				writer.writeEndElement();
+				themed = true;
+			}
+		}
+		if (reader.hasError() || writer.hasError())
+			return {};
+		return themed ? result : svg;
+	}
+
+	class LemonSvgIconEngine : public QIconEngine {
+	  public:
+		explicit LemonSvgIconEngine(const QString &fileName) {
+			addFile(fileName, {}, QIcon::Normal, QIcon::Off);
+		}
+		QIconEngine *clone() const override { return new LemonSvgIconEngine(*this); }
+		QString key() const override { return QStringLiteral("llsvg"); }
+		bool isNull() override { return svg.isEmpty(); }
+
+		void addFile(const QString &name, const QSize &, QIcon::Mode, QIcon::State) override {
+			fileName = name;
+			svg.clear();
+			sourceId.clear();
+			lastStyleSheet.clear();
+			themedSvg.clear();
+			defaultSize = {};
+			if (name.isEmpty())
+				return;
+			QFile file(name);
+			if (! file.open(QIODevice::ReadOnly))
+				return;
+			const QByteArray data = file.readAll();
+			QSvgRenderer renderer(data);
+			if (! renderer.isValid())
+				return;
+			svg = data;
+			defaultSize = renderer.defaultSize();
+			sourceId =
+			    QString::fromLatin1(QCryptographicHash::hash(data, QCryptographicHash::Sha256).toHex());
+		}
+
+		QSize actualSize(const QSize &size, QIcon::Mode, QIcon::State) override {
+			return defaultSize.isEmpty() ? QSize() : defaultSize.scaled(size, Qt::KeepAspectRatio);
+		}
+
+		QPixmap pixmap(const QSize &size, QIcon::Mode mode, QIcon::State state) override {
+			return scaledPixmap(size, mode, state, 1.0);
+		}
+
+		QPixmap scaledPixmap(const QSize &size, QIcon::Mode mode, QIcon::State state, qreal scale) override {
+			if (isNull() || size.isEmpty() || scale <= 0)
+				return {};
+			const QPalette palette = QGuiApplication::palette();
+			const auto group = mode == QIcon::Disabled ? QPalette::Disabled
+			                   : QGuiApplication::applicationState() == Qt::ApplicationActive
+			                       ? QPalette::Active
+			                       : QPalette::Inactive;
+			const QString cacheKey = QStringLiteral("lemon-svg:%1:%2:%3:%4:%5x%6:%7:%8")
+			                             .arg(sourceId)
+			                             .arg(palette.cacheKey())
+			                             .arg(int(group))
+			                             .arg(int(mode))
+			                             .arg(size.width())
+			                             .arg(size.height())
+			                             .arg(scale, 0, 'g', 17)
+			                             .arg(int(state));
+			QPixmap result;
+			if (QPixmapCache::find(cacheKey, &result))
+				return result;
+
+			const QString styleSheet = iconStyleSheet(palette, group, mode);
+			if (styleSheet != lastStyleSheet) {
+				themedSvg = applyStyleSheet(svg, styleSheet);
+				lastStyleSheet = styleSheet;
+			}
+			QSvgRenderer renderer(themedSvg);
+			if (! renderer.isValid())
+				return {};
+			renderer.setAspectRatioMode(Qt::KeepAspectRatio);
+			result = QPixmap(size * scale);
+			result.setDevicePixelRatio(scale);
+			result.fill(Qt::transparent);
+			{
+				QPainter painter(&result);
+				renderer.render(&painter, QRectF(QPointF(), QSizeF(size)));
+			}
+			QPixmapCache::insert(cacheKey, result);
+			return result;
+		}
+
+		void paint(QPainter *painter, const QRect &rect, QIcon::Mode mode, QIcon::State state) override {
+			painter->drawPixmap(
+			    rect, scaledPixmap(rect.size(), mode, state, painter->device()->devicePixelRatioF()));
+		}
+
+	  private:
+		QString fileName;
+		QByteArray svg;
+		QString sourceId;
+		QSize defaultSize;
+		QString lastStyleSheet;
+		QByteArray themedSvg;
+	};
+} // namespace
+
+class LemonSvgIconPlugin : public QIconEnginePlugin {
+	Q_OBJECT
+	Q_PLUGIN_METADATA(IID QIconEngineFactoryInterface_iid FILE "lemonsvgiconplugin.json")
+
+  public:
+	QIconEngine *create(const QString &fileName = QString()) override {
+		return new LemonSvgIconEngine(fileName);
+	}
+};
+
+#include "lemonsvgiconplugin.moc"
diff --git a/src/plugins/lemonsvgiconplugin.json b/src/plugins/lemonsvgiconplugin.json
new file mode 100644
index 00000000..6077c518
--- /dev/null
+++ b/src/plugins/lemonsvgiconplugin.json
@@ -0,0 +1,3 @@
+{
+    "Keys": ["llsvg"]
+}
diff --git a/src/plugins/lemonsvgiconplugin.json.license b/src/plugins/lemonsvgiconplugin.json.license
new file mode 100644
index 00000000..a85428ec
--- /dev/null
+++ b/src/plugins/lemonsvgiconplugin.json.license
@@ -0,0 +1,2 @@
+SPDX-FileCopyrightText: 2026 Project LemonLime
+SPDX-License-Identifier: GPL-3.0-or-later