diff --git a/src/components/settings/SettingsDialog.tsx b/src/components/settings/SettingsDialog.tsx
index 7cd2de3..2b4ebb3 100644
--- a/src/components/settings/SettingsDialog.tsx
+++ b/src/components/settings/SettingsDialog.tsx
@@ -1,4 +1,7 @@
-import { Sun, Moon, Monitor } from "lucide-react";
+import { useState } from "react";
+import {
+  Sun, Moon, Monitor, RotateCcw,
+} from "lucide-react";
 import {
   Dialog,
   DialogContent,
@@ -10,12 +13,15 @@ import { Separator } from "@/components/ui/separator";
 import { Button } from "@/components/ui/button";
 import { useAppStore } from "@/stores/app-store";
 import type { AppSettings } from "@/types/settings";
+import type { ColumnWidth } from "@/types/board";
 
 interface SettingsDialogProps {
   open: boolean;
   onOpenChange: (open: boolean) => void;
 }
 
+type Tab = "appearance" | "boards" | "shortcuts" | "about";
+
 const THEME_OPTIONS: {
   value: AppSettings["theme"];
   label: string;
@@ -26,13 +32,69 @@ const THEME_OPTIONS: {
   { value: "system", label: "System", icon: Monitor },
 ];
 
+const ACCENT_PRESETS: { hue: string; label: string }[] = [
+  { hue: "160", label: "Teal" },
+  { hue: "240", label: "Blue" },
+  { hue: "300", label: "Purple" },
+  { hue: "350", label: "Pink" },
+  { hue: "25", label: "Red" },
+  { hue: "55", label: "Orange" },
+  { hue: "85", label: "Yellow" },
+  { hue: "130", label: "Lime" },
+  { hue: "200", label: "Cyan" },
+  { hue: "0", label: "Slate" },
+];
+
+const DENSITY_OPTIONS: {
+  value: AppSettings["density"];
+  label: string;
+}[] = [
+  { value: "compact", label: "Compact" },
+  { value: "comfortable", label: "Comfortable" },
+  { value: "spacious", label: "Spacious" },
+];
+
+const WIDTH_OPTIONS: { value: ColumnWidth; label: string }[] = [
+  { value: "narrow", label: "Narrow" },
+  { value: "standard", label: "Standard" },
+  { value: "wide", label: "Wide" },
+];
+
+const SHORTCUTS: { key: string; description: string; category: string }[] = [
+  { key: "Ctrl+K", description: "Open command palette", category: "Navigation" },
+  { key: "Ctrl+Z", description: "Undo", category: "Board" },
+  { key: "Ctrl+Shift+Z", description: "Redo", category: "Board" },
+  { key: "?", description: "Keyboard shortcuts", category: "Navigation" },
+  { key: "Escape", description: "Close modal / cancel", category: "Navigation" },
+];
+
+const TABS: { value: Tab; label: string }[] = [
+  { value: "appearance", label: "Appearance" },
+  { value: "boards", label: "Boards" },
+  { value: "shortcuts", label: "Shortcuts" },
+  { value: "about", label: "About" },
+];
+
+function SectionLabel({ children }: { children: React.ReactNode }) {
+  return (
+    <label className="mb-2 block font-mono text-xs font-semibold uppercase tracking-widest text-pylon-text-secondary">
+      {children}
+    </label>
+  );
+}
+
 export function SettingsDialog({ open, onOpenChange }: SettingsDialogProps) {
-  const theme = useAppStore((s) => s.settings.theme);
+  const [tab, setTab] = useState<Tab>("appearance");
+  const settings = useAppStore((s) => s.settings);
   const setTheme = useAppStore((s) => s.setTheme);
+  const setAccentColor = useAppStore((s) => s.setAccentColor);
+  const setUiZoom = useAppStore((s) => s.setUiZoom);
+  const setDensity = useAppStore((s) => s.setDensity);
+  const setDefaultColumnWidth = useAppStore((s) => s.setDefaultColumnWidth);
 
   return (
     <Dialog open={open} onOpenChange={onOpenChange}>
-      <DialogContent className="bg-pylon-surface sm:max-w-md">
+      <DialogContent className="bg-pylon-surface sm:max-w-lg">
         <DialogHeader>
           <DialogTitle className="font-heading text-pylon-text">
             Settings
@@ -42,43 +104,180 @@ export function SettingsDialog({ open, onOpenChange }: SettingsDialogProps) {
           </DialogDescription>
         </DialogHeader>
 
-        <div className="flex flex-col gap-5">
-          {/* Theme section */}
-          <div>
-            <label className="mb-2 block font-mono text-xs font-semibold uppercase tracking-widest text-pylon-text-secondary">
-              Theme
-            </label>
-            <div className="flex gap-2">
-              {THEME_OPTIONS.map(({ value, label, icon: Icon }) => (
-                <Button
-                  key={value}
-                  type="button"
-                  variant={theme === value ? "default" : "outline"}
-                  size="sm"
-                  onClick={() => setTheme(value)}
-                  className="flex-1 gap-2"
-                >
-                  <Icon className="size-4" />
-                  {label}
-                </Button>
+        {/* Tab bar */}
+        <div className="flex gap-1 border-b border-border pb-2">
+          {TABS.map((t) => (
+            <Button
+              key={t.value}
+              variant={tab === t.value ? "secondary" : "ghost"}
+              size="sm"
+              onClick={() => setTab(t.value)}
+              className="font-mono text-xs"
+            >
+              {t.label}
+            </Button>
+          ))}
+        </div>
+
+        {/* Tab content */}
+        <div className="flex flex-col gap-5 pt-1">
+          {tab === "appearance" && (
+            <>
+              {/* Theme */}
+              <div>
+                <SectionLabel>Theme</SectionLabel>
+                <div className="flex gap-2">
+                  {THEME_OPTIONS.map(({ value, label, icon: Icon }) => (
+                    <Button
+                      key={value}
+                      type="button"
+                      variant={settings.theme === value ? "default" : "outline"}
+                      size="sm"
+                      onClick={() => setTheme(value)}
+                      className="flex-1 gap-2"
+                    >
+                      <Icon className="size-4" />
+                      {label}
+                    </Button>
+                  ))}
+                </div>
+              </div>
+
+              <Separator />
+
+              {/* UI Zoom */}
+              <div>
+                <div className="mb-2 flex items-center justify-between">
+                  <SectionLabel>UI Zoom</SectionLabel>
+                  <div className="flex items-center gap-2">
+                    <span className="font-mono text-xs text-pylon-text-secondary">
+                      {Math.round(settings.uiZoom * 100)}%
+                    </span>
+                    {settings.uiZoom !== 1 && (
+                      <Button
+                        variant="ghost"
+                        size="icon-xs"
+                        onClick={() => setUiZoom(1)}
+                        className="text-pylon-text-secondary hover:text-pylon-text"
+                      >
+                        <RotateCcw className="size-3" />
+                      </Button>
+                    )}
+                  </div>
+                </div>
+                <input
+                  type="range"
+                  min="0.75"
+                  max="1.5"
+                  step="0.05"
+                  value={settings.uiZoom}
+                  onChange={(e) => setUiZoom(parseFloat(e.target.value))}
+                  className="w-full accent-pylon-accent"
+                />
+                <div className="mt-1 flex justify-between font-mono text-[10px] text-pylon-text-secondary">
+                  <span>75%</span>
+                  <span>100%</span>
+                  <span>150%</span>
+                </div>
+              </div>
+
+              <Separator />
+
+              {/* Accent Color */}
+              <div>
+                <SectionLabel>Accent Color</SectionLabel>
+                <div className="flex flex-wrap gap-2">
+                  {ACCENT_PRESETS.map(({ hue, label }) => {
+                    const isAchromatic = hue === "0";
+                    const bg = isAchromatic
+                      ? "oklch(50% 0 0)"
+                      : `oklch(55% 0.12 ${hue})`;
+                    return (
+                      <button
+                        key={hue}
+                        type="button"
+                        onClick={() => setAccentColor(hue)}
+                        className="size-7 rounded-full transition-transform hover:scale-110"
+                        style={{
+                          backgroundColor: bg,
+                          outline: settings.accentColor === hue ? "2px solid currentColor" : "none",
+                          outlineOffset: "2px",
+                        }}
+                        aria-label={label}
+                        title={label}
+                      />
+                    );
+                  })}
+                </div>
+              </div>
+
+              <Separator />
+
+              {/* Density */}
+              <div>
+                <SectionLabel>Density</SectionLabel>
+                <div className="flex gap-2">
+                  {DENSITY_OPTIONS.map(({ value, label }) => (
+                    <Button
+                      key={value}
+                      type="button"
+                      variant={settings.density === value ? "default" : "outline"}
+                      size="sm"
+                      onClick={() => setDensity(value)}
+                      className="flex-1"
+                    >
+                      {label}
+                    </Button>
+                  ))}
+                </div>
+              </div>
+            </>
+          )}
+
+          {tab === "boards" && (
+            <div>
+              <SectionLabel>Default Column Width</SectionLabel>
+              <div className="flex gap-2">
+                {WIDTH_OPTIONS.map(({ value, label }) => (
+                  <Button
+                    key={value}
+                    type="button"
+                    variant={settings.defaultColumnWidth === value ? "default" : "outline"}
+                    size="sm"
+                    onClick={() => setDefaultColumnWidth(value)}
+                    className="flex-1"
+                  >
+                    {label}
+                  </Button>
+                ))}
+              </div>
+            </div>
+          )}
+
+          {tab === "shortcuts" && (
+            <div className="flex flex-col gap-1">
+              {SHORTCUTS.map(({ key, description }) => (
+                <div key={key} className="flex items-center justify-between py-1">
+                  <span className="text-sm text-pylon-text">{description}</span>
+                  <kbd className="rounded bg-pylon-column px-2 py-0.5 font-mono text-xs text-pylon-text-secondary">
+                    {key}
+                  </kbd>
+                </div>
               ))}
             </div>
-          </div>
+          )}
 
-          <Separator />
-
-          {/* About section */}
-          <div>
-            <label className="mb-2 block font-mono text-xs font-semibold uppercase tracking-widest text-pylon-text-secondary">
-              About
-            </label>
-            <div className="space-y-1 text-sm text-pylon-text">
-              <p className="font-semibold">OpenPylon v0.1.0</p>
+          {tab === "about" && (
+            <div className="space-y-2 text-sm text-pylon-text">
+              <p className="font-heading text-lg">OpenPylon</p>
               <p className="text-pylon-text-secondary">
-                Local-first Kanban board
+                v0.1.0 &middot; Local-first Kanban board
+              </p>
+              <p className="text-pylon-text-secondary">
+                Built with Tauri, React, and TypeScript.
               </p>
             </div>
-          </div>
+          )}
         </div>
       </DialogContent>
     </Dialog>