new UI updates

src/main/java/com/kfmanager/config/AppConfig.java

@@ -305,6 +305,20 @@ public class AppConfig {
         }
     }
 
+    public Color getFolderColor() {
+        String v = properties.getProperty("appearance.folder", null);
+        if (v == null) return new Color(255, 200, 0); // Default yellow/gold
+        try { return Color.decode(v); } catch (Exception ex) { return new Color(255, 200, 0); }
+    }
+
+    public void setFolderColor(Color c) {
+        if (c == null) {
+            properties.remove("appearance.folder");
+        } else {
+            properties.setProperty("appearance.folder", String.format("#%02x%02x%02x", c.getRed(), c.getGreen(), c.getBlue()));
+        }
+    }
+
     // -- Sorting persistence (global default)
     public int getDefaultSortColumn() {
         return Integer.parseInt(properties.getProperty("global.sort.column", "-1"));

src/main/java/com/kfmanager/ui/FileEditor.java

@@ -439,10 +439,6 @@ public class FileEditor extends JDialog {
         updateStatus();
     }
 
-    private void buildHexViewText() {
-        buildHexViewText(0L);
-    }
-
     private void buildHexViewText(long baseOffset) {
         byteTextOffsets.clear();
         if (fileBytes == null) fileBytes = new byte[0];

src/main/java/com/kfmanager/ui/FilePanel.java

@@ -5,7 +5,6 @@ import com.kfmanager.model.FileItem;
 import javax.swing.*;
 import java.awt.*;
 import java.awt.event.ActionEvent;
-import java.awt.event.KeyEvent;
 import java.io.File;
 import java.util.List;
 
@@ -443,13 +442,6 @@ public class FilePanel extends JPanel {
         double gb = bytes / 1024.0 / 1024.0 / 1024.0;
         return String.format("%.1f", gb);
     }
-
-    private static String humanReadableByteCount(long bytes) {
-        if (bytes < 1024) return bytes + " B";
-        int exp = (int) (Math.log(bytes) / Math.log(1024));
-        String pre = "KMGTPE".charAt(exp-1) + "";
-        return String.format("%.1f %sB", bytes / Math.pow(1024, exp), pre);
-    }
     
     /**
      * Request focus on the table in the current tab

src/main/java/com/kfmanager/ui/FilePanelTab.java

@@ -31,12 +31,10 @@ public class FilePanelTab extends JPanel {
     private JLabel statusLabel;
     private ViewMode viewMode = ViewMode.FULL;
     private int briefCurrentColumn = 0;
-    private int briefColumnBeforeEnter = 0;
     private Runnable onDirectoryChanged;
     private Runnable onSwitchPanelRequested;
     // Appearance customization
     private Color selectionColor = new Color(184, 207, 229);
-    private Color selectionInactiveColor = new Color(220, 220, 220);
     private Color markedColor = new Color(204, 153, 0);
     // Sorting state for FULL mode header clicks
     private int sortColumn = -1; // 0=name,1=size,2=date
@@ -155,8 +153,6 @@ public class FilePanelTab extends JPanel {
     public void applySelectionColor(Color sel) {
         if (sel == null) return;
         this.selectionColor = sel;
-        // Derive an inactive variant
-        this.selectionInactiveColor = sel.brighter();
         fileTable.repaint();
     }
 
@@ -828,7 +824,6 @@ public class FilePanelTab extends JPanel {
                     loadDirectory(temp.toFile());
                 }
             } else if (item.isDirectory()) {
-                briefColumnBeforeEnter = briefCurrentColumn;
                 loadDirectory(item.getFile());
             }
         }
@@ -869,7 +864,6 @@ public class FilePanelTab extends JPanel {
                 loadDirectory(temp.toFile());
             }
         } else if (item.isDirectory()) {
-            briefColumnBeforeEnter = briefCurrentColumn;
             loadDirectory(item.getFile());
         }
     }
@@ -1006,11 +1000,15 @@ public class FilePanelTab extends JPanel {
                 if (cur.equals(currentArchiveTempDir)) {
                     File parent = currentArchiveSourceFile.getParentFile();
                     if (parent != null) {
+                        String archiveName = currentArchiveSourceFile.getName();
                         // cleanup temp dir before switching back
                         deleteTempDirRecursively(currentArchiveTempDir);
                         currentArchiveTempDir = null;
                         currentArchiveSourceFile = null;
-                        loadDirectory(parent, true);
+                        loadDirectory(parent, false);
+                        
+                        // Select the archive file we just left
+                        SwingUtilities.invokeLater(() -> selectItemByName(archiveName));
                     }
                     return;
                 }
@@ -1019,7 +1017,11 @@ public class FilePanelTab extends JPanel {
 
         File parent = currentDirectory.getParentFile();
         if (parent != null) {
-            loadDirectory(parent, true);
+            String previousDirName = currentDirectory.getName();
+            loadDirectory(parent, false);
+            
+            // Select the directory we just left
+            SwingUtilities.invokeLater(() -> selectItemByName(previousDirName));
         }
     }
     
@@ -1036,6 +1038,7 @@ public class FilePanelTab extends JPanel {
                         fileTable.setRowSelectionInterval(row, row);
                         fileTable.scrollRectToVisible(fileTable.getCellRect(row, column, true));
                         fileTable.repaint();
+                        fileTable.requestFocusInWindow();
                         updateStatus();
                     }
                     return;
@@ -1047,6 +1050,7 @@ public class FilePanelTab extends JPanel {
                 if (item != null && item.getName().equals(name)) {
                     fileTable.setRowSelectionInterval(i, i);
                     fileTable.scrollRectToVisible(fileTable.getCellRect(i, 0, true));
+                    fileTable.requestFocusInWindow();
                     updateStatus();
                     return;
                 }
@@ -1258,6 +1262,12 @@ public class FilePanelTab extends JPanel {
                     
                     // Zobrazit ikonu pro názvy souborů
                     Icon icon = item.getIcon();
+                    if (item.getName().equals("..")) {
+                        icon = new UpArrowIcon(getForeground());
+                    } else if (item.isDirectory() && persistedConfig != null) {
+                        icon = new ColoredFolderIcon(persistedConfig.getFolderColor());
+                    }
+
                     if (viewMode == ViewMode.BRIEF) {
                         // V BRIEF módu jsou všechny sloupce názvy
                         setIcon(icon);
@@ -1913,4 +1923,80 @@ public class FilePanelTab extends JPanel {
             return null;
         }
     }
+
+    /**
+     * Custom icon for directories that uses a configurable color.
+     */
+    private static class ColoredFolderIcon implements Icon {
+        private final Color color;
+
+        public ColoredFolderIcon(Color color) {
+            this.color = color;
+        }
+
+        @Override
+        public void paintIcon(Component c, Graphics g, int x, int y) {
+            Graphics2D g2 = (Graphics2D) g.create();
+            g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
+            
+            g2.setColor(color);
+            // Draw a simple folder shape
+            // Main body
+            g2.fillRect(x + 2, y + 4, 12, 8);
+            // Tab
+            g2.fillRect(x + 2, y + 2, 5, 2);
+            
+            // Optional: outline for depth
+            g2.setColor(color.darker());
+            g2.drawRect(x + 2, y + 4, 12, 8);
+            
+            g2.dispose();
+        }
+
+        @Override
+        public int getIconWidth() {
+            return 16;
+        }
+
+        @Override
+        public int getIconHeight() {
+            return 16;
+        }
+    }
+
+    /**
+     * Custom icon for ".." that shows an upward arrow.
+     */
+    private static class UpArrowIcon implements Icon {
+        private final Color color;
+
+        public UpArrowIcon(Color color) {
+            this.color = color;
+        }
+
+        @Override
+        public void paintIcon(Component c, Graphics g, int x, int y) {
+            Graphics2D g2 = (Graphics2D) g.create();
+            g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
+            
+            g2.setColor(color);
+            // Draw a simple upward arrow
+            int[] xPoints = {x + 8, x + 3, x + 13};
+            int[] yPoints = {y + 3, y + 10, y + 10};
+            g2.fillPolygon(xPoints, yPoints, 3);
+            g2.fillRect(x + 7, y + 10, 2, 4);
+            
+            g2.dispose();
+        }
+
+        @Override
+        public int getIconWidth() {
+            return 16;
+        }
+
+        @Override
+        public int getIconHeight() {
+            return 16;
+        }
+    }
 }

src/main/java/com/kfmanager/ui/SettingsDialog.java

@@ -23,6 +23,7 @@ public class SettingsDialog extends JDialog {
     private final Color originalBg;
     private final Color originalSel;
     private final Color originalMark;
+    private final Color originalFolder;
     private final Font originalGlobalFont;
     private final Font originalEditorFont;
 
@@ -31,6 +32,7 @@ public class SettingsDialog extends JDialog {
     private JButton appearanceBgBtn;
     private JButton appearanceSelBtn;
     private JButton appearanceMarkBtn;
+    private JButton appearanceFolderBtn;
 
     // Editor controls
     private JButton editorFontBtn;
@@ -47,6 +49,7 @@ public class SettingsDialog extends JDialog {
         this.originalBg = config.getBackgroundColor();
         this.originalSel = config.getSelectionColor();
         this.originalMark = config.getMarkedColor();
+        this.originalFolder = config.getFolderColor();
         this.originalGlobalFont = config.getGlobalFont();
         this.originalEditorFont = config.getEditorFont();
 
@@ -159,6 +162,7 @@ public class SettingsDialog extends JDialog {
             config.setBackgroundColor(originalBg);
             config.setSelectionColor(originalSel);
             config.setMarkedColor(originalMark);
+            config.setFolderColor(originalFolder);
             config.setGlobalFont(originalGlobalFont);
             config.setEditorFont(originalEditorFont);
             
@@ -212,6 +216,13 @@ public class SettingsDialog extends JDialog {
         });
         grid.add(appearanceMarkBtn);
 
+        grid.add(new JLabel("Folder icon color:"));
+        appearanceFolderBtn = createColorButton(config.getFolderColor(), "Choose folder icon color", c -> {
+            config.setFolderColor(c);
+            if (onChange != null) onChange.run();
+        });
+        grid.add(appearanceFolderBtn);
+
         p.add(grid, BorderLayout.NORTH);
         panels.put("Appearance", p);
         return p;