diff --git a/.claude/skills/tailwind-v4.md b/.claude/skills/tailwind-v4.md
new file mode 100644
index 0000000..2d453d5
--- /dev/null
+++ b/.claude/skills/tailwind-v4.md
@@ -0,0 +1,401 @@
+# Skill: Tailwind CSS v4
+
+This document provides guidance for writing CSS and using Tailwind in Grimoire after the v4 migration.
+
+## Quick Reference
+
+### Import Syntax
+```css
+/* v4 - Single import replaces @tailwind directives */
+@import "tailwindcss";
+```
+
+### Defining Theme Variables
+```css
+@theme {
+  --color-brand: oklch(0.72 0.11 221.19);
+  --font-display: "Satoshi", sans-serif;
+  --animate-fade: fade 0.3s ease-out;
+
+  @keyframes fade {
+    from { opacity: 0; }
+    to { opacity: 1; }
+  }
+}
+```
+
+### Custom Utilities
+```css
+/* v4 - Use @utility instead of @layer utilities */
+@utility content-auto {
+  content-visibility: auto;
+}
+
+/* With nested selectors */
+@utility scrollbar-hidden {
+  scrollbar-width: none;
+  -ms-overflow-style: none;
+
+  &::-webkit-scrollbar {
+    display: none;
+  }
+}
+```
+
+### Custom Variants
+```css
+/* Simple variant */
+@custom-variant theme-dark (&:where(.dark, .dark *));
+
+/* Complex variant */
+@custom-variant any-hover {
+  @media (any-hover: hover) {
+    &:hover {
+      @slot;
+    }
+  }
+}
+```
+
+---
+
+## Grimoire Theme System
+
+Grimoire uses a **two-level CSS variable system** for runtime theming:
+
+### Level 1: Runtime Variables (set by ThemeProvider)
+These are HSL values WITHOUT the `hsl()` wrapper:
+```css
+:root {
+  --background: 222.2 84% 4.9%;
+  --foreground: 210 40% 98%;
+  --primary: 210 40% 98%;
+  /* ... */
+}
+```
+
+### Level 2: Tailwind Color Mapping (in @theme)
+These reference the runtime variables with `hsl()`:
+```css
+@theme {
+  --color-background: hsl(var(--background));
+  --color-foreground: hsl(var(--foreground));
+  --color-primary: hsl(var(--primary));
+}
+```
+
+### Using Colors in Components
+
+**In Tailwind classes:**
+```tsx
+<div className="bg-background text-foreground border-border">
+<button className="bg-primary text-primary-foreground">
+<span className="text-muted-foreground">
+```
+
+**In custom CSS with opacity:**
+```css
+.my-element {
+  background: hsl(var(--primary) / 0.1);
+  border: 1px solid hsl(var(--border) / 0.5);
+}
+```
+
+### Available Color Tokens
+
+| Token | Usage |
+|-------|-------|
+| `background` / `foreground` | Page background and text |
+| `card` / `card-foreground` | Card surfaces |
+| `popover` / `popover-foreground` | Dropdowns, tooltips |
+| `primary` / `primary-foreground` | Primary buttons, links |
+| `secondary` / `secondary-foreground` | Secondary actions |
+| `accent` / `accent-foreground` | Highlights, emphasis |
+| `muted` / `muted-foreground` | Subdued elements |
+| `destructive` / `destructive-foreground` | Delete, error actions |
+| `border` | Borders |
+| `input` | Form input borders |
+| `ring` | Focus rings |
+| `success` / `warning` / `info` | Status indicators |
+| `zap` | Lightning zap color (gold) |
+| `live` | Live indicator (red) |
+| `highlight` | Active user highlight (orange) |
+| `tooltip` / `tooltip-foreground` | Tooltip background/text |
+
+---
+
+## Container Queries (Built-in)
+
+No plugin needed in v4. Use for component-relative responsiveness:
+
+```tsx
+// Parent defines container
+<div className="@container">
+  // Children respond to container width
+  <div className="grid grid-cols-1 @sm:grid-cols-2 @lg:grid-cols-3">
+    {items.map(item => <Card key={item.id} />)}
+  </div>
+</div>
+```
+
+### Container Query Breakpoints
+| Variant | Width |
+|---------|-------|
+| `@xs:` | 20rem (320px) |
+| `@sm:` | 24rem (384px) |
+| `@md:` | 28rem (448px) |
+| `@lg:` | 32rem (512px) |
+| `@xl:` | 36rem (576px) |
+| `@2xl:` | 42rem (672px) |
+
+### Max-width Queries
+```tsx
+<div className="@container">
+  <div className="flex-row @max-sm:flex-col">
+    {/* Row on larger containers, column on smaller */}
+  </div>
+</div>
+```
+
+### Named Containers
+```tsx
+<div className="@container/sidebar">
+  <nav className="@sm/sidebar:flex-col">
+```
+
+---
+
+## Renamed Utilities (v3 → v4)
+
+| v3 | v4 | Notes |
+|----|----| ------|
+| `shadow-sm` | `shadow-xs` | Smallest shadow |
+| `shadow` | `shadow-sm` | Default shadow |
+| `rounded-sm` | `rounded-xs` | Smallest radius |
+| `rounded` | `rounded-sm` | Default radius |
+| `blur-sm` | `blur-xs` | Smallest blur |
+| `blur` | `blur-sm` | Default blur |
+| `ring` | `ring-3` | Default ring width |
+
+**Important:** Always use the named size, not bare utilities.
+
+---
+
+## CSS Variable Syntax in Classes
+
+**v4 uses parentheses instead of brackets:**
+
+```tsx
+// ❌ v3 syntax (deprecated)
+<div className="bg-[--my-color]" />
+<div className="fill-[--icon-color]" />
+
+// ✅ v4 syntax
+<div className="bg-(--my-color)" />
+<div className="fill-(--icon-color)" />
+```
+
+---
+
+## Important Modifier Position
+
+**v4 moves `!` to the end:**
+
+```tsx
+// ❌ v3 syntax
+<div className="!flex !mt-0" />
+
+// ✅ v4 syntax
+<div className="flex! mt-0!" />
+```
+
+---
+
+## New Useful Variants
+
+### not-* Variant
+Style when condition is NOT met:
+```tsx
+<div className="not-hover:opacity-75">Dims when not hovered</div>
+<div className="not-first:mt-4">Margin except first child</div>
+<div className="not-disabled:cursor-pointer">Clickable when enabled</div>
+```
+
+### @starting-style for Animations
+CSS-only enter animations without JS:
+```tsx
+<dialog className="
+  transition-all duration-300
+  open:opacity-100 open:scale-100
+  starting:open:opacity-0 starting:open:scale-95
+">
+```
+
+### inert Variant
+Style non-interactive elements:
+```tsx
+<div className="inert:opacity-50 inert:pointer-events-none">
+```
+
+---
+
+## 3D Transforms
+
+```tsx
+<div className="perspective-distant">
+  <div className="rotate-x-12 rotate-y-6 transform-3d hover:rotate-y-12">
+    3D card effect
+  </div>
+</div>
+```
+
+Available utilities:
+- `rotate-x-*`, `rotate-y-*`, `rotate-z-*`
+- `translate-z-*`, `scale-z-*`
+- `perspective-normal` (500px), `perspective-distant` (1200px)
+- `transform-3d` (enables 3D space)
+
+---
+
+## Gradients
+
+### Linear Gradients
+```tsx
+// Angle-based
+<div className="bg-linear-45 from-red-500 to-blue-500" />
+
+// Direction-based
+<div className="bg-linear-to-r from-primary to-accent" />
+
+// With color interpolation (more vivid colors)
+<div className="bg-linear-to-r/oklch from-red-500 to-blue-500" />
+```
+
+### Radial & Conic
+```tsx
+<div className="bg-radial from-white to-transparent" />
+<div className="bg-conic from-red-500 via-yellow-500 to-red-500" />
+```
+
+---
+
+## Writing Custom CSS
+
+### In @layer base
+For global resets and element defaults:
+```css
+@layer base {
+  * {
+    @apply border-border;
+  }
+
+  body {
+    @apply bg-background text-foreground font-mono;
+  }
+
+  button:focus-visible {
+    outline: 2px solid hsl(var(--ring));
+    outline-offset: 2px;
+  }
+}
+```
+
+### With @utility
+For reusable utility classes:
+```css
+@utility text-balance {
+  text-wrap: balance;
+}
+
+@utility glass {
+  background: hsl(var(--background) / 0.8);
+  backdrop-filter: blur(8px);
+}
+```
+
+### Plain CSS (non-Tailwind)
+For third-party component overrides (like Mosaic):
+```css
+/* No @layer needed - uses native cascade */
+.mosaic-window .mosaic-window-toolbar {
+  background: hsl(var(--muted));
+  border-bottom: 1px solid hsl(var(--border));
+}
+```
+
+---
+
+## Best Practices
+
+### DO:
+- Use semantic color tokens (`bg-primary`) not raw colors
+- Use container queries for component responsiveness
+- Use `@utility` for custom utilities
+- Use HSL variable pattern with opacity: `hsl(var(--color) / 0.5)`
+- Keep custom CSS minimal - prefer Tailwind classes
+
+### DON'T:
+- Hardcode colors (`bg-blue-500`) - use theme tokens
+- Use viewport queries when container queries work better
+- Use `@layer utilities` (v3 syntax) - use `@utility`
+- Use bracket syntax for CSS vars (`[--var]`) - use parentheses `(--var)`
+- Put `!` at the start (`!flex`) - put at end (`flex!`)
+
+---
+
+## File Structure
+
+```
+src/
+├── index.css           # Main CSS: @import "tailwindcss", @theme, @utility, custom CSS
+├── styles/
+│   └── prism-theme.css # Syntax highlighting (uses CSS variables)
+├── components/
+│   └── command-launcher.css  # Command palette styles
+└── lib/themes/
+    ├── types.ts        # Theme TypeScript types
+    ├── apply.ts        # Runtime theme application
+    └── builtin/        # Built-in theme definitions
+```
+
+---
+
+## Theme Development
+
+When creating or modifying themes, edit files in `src/lib/themes/builtin/`:
+
+```typescript
+// src/lib/themes/builtin/my-theme.ts
+import type { Theme } from "../types";
+
+export const myTheme: Theme = {
+  id: "my-theme",
+  name: "My Theme",
+  colors: {
+    background: "220 20% 10%",  // HSL without wrapper
+    foreground: "220 10% 90%",
+    // ... all required colors
+  },
+  syntax: { /* ... */ },
+  scrollbar: { /* ... */ },
+  gradient: { /* ... */ },
+};
+```
+
+Register in `src/lib/themes/builtin/index.ts`.
+
+---
+
+## Quick Debugging
+
+Check what CSS variables are set:
+```javascript
+// In browser console
+getComputedStyle(document.documentElement).getPropertyValue('--background')
+```
+
+List all theme variables:
+```javascript
+import { getThemeVariables } from '@/lib/themes/apply';
+console.log(getThemeVariables());
+```
diff --git a/CLAUDE.md b/CLAUDE.md
index c02ed43..9e7c7fa 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -277,10 +277,54 @@ if (canSign) {
 - Copy text to clipboard with toast feedback
 - Returns: `{ copy, copied }` function and state
 
+## Tailwind CSS v4
+
+Grimoire uses **Tailwind CSS v4** with CSS-first configuration. See `.claude/skills/tailwind-v4.md` for complete reference.
+
+### Quick Reference
+
+**Import (in index.css):**
+```css
+@import "tailwindcss";
+```
+
+**Custom utilities:**
+```css
+@utility my-utility {
+  /* styles */
+}
+```
+
+**Theme colors** - Always use semantic tokens:
+```tsx
+<div className="bg-background text-foreground">
+<button className="bg-primary text-primary-foreground">
+<span className="text-muted-foreground">
+```
+
+**Container queries** (built-in, no plugin):
+```tsx
+<div className="@container">
+  <div className="@sm:grid-cols-2 @lg:grid-cols-3">
+```
+
+**Key syntax changes from v3:**
+- CSS variables: `bg-(--my-var)` not `bg-[--my-var]`
+- Important: `flex!` not `!flex`
+- Sizes: `shadow-xs` (was `shadow-sm`), `shadow-sm` (was `shadow`)
+
+### Runtime Theming
+
+Colors use two-level CSS variables:
+1. Runtime vars (HSL without wrapper): `--background: 222.2 84% 4.9%`
+2. Tailwind mapping: `--color-background: hsl(var(--background))`
+
+This allows `applyTheme()` to switch themes at runtime.
+
 ## Key Conventions
 
 - **Path Alias**: `@/` = `./src/`
-- **Styling**: Tailwind + HSL CSS variables (theme tokens defined in `index.css`)
+- **Styling**: Tailwind v4 + HSL CSS variables (theme tokens defined in `index.css`)
 - **Types**: Prefer types from `applesauce-core`, extend in `src/types/` when needed
 - **Locale-Aware Formatting** (`src/hooks/useLocale.ts`): All date, time, number, and currency formatting MUST use the user's locale:
   - **`useLocale()` hook**: Returns `{ locale, language, region, timezone, timeFormat }` - use in components that need locale config
diff --git a/package-lock.json b/package-lock.json
index 2cd2bbf..e9e2da0 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -80,6 +80,7 @@
       "devDependencies": {
         "@eslint/js": "^9.17.0",
         "@react-router/dev": "^7.1.0",
+        "@tailwindcss/vite": "^4.0.0",
         "@testing-library/dom": "^10.4.1",
         "@testing-library/react": "^16.3.1",
         "@types/js-yaml": "^4.0.9",
@@ -92,7 +93,6 @@
         "@types/ws": "^8.18.1",
         "@vitejs/plugin-react": "^4.3.4",
         "@vitest/ui": "^4.0.15",
-        "autoprefixer": "^10.4.20",
         "eslint": "^9.17.0",
         "eslint-config-prettier": "^10.1.8",
         "eslint-plugin-prettier": "^5.5.4",
@@ -105,7 +105,7 @@
         "postcss": "^8.4.49",
         "prettier": "^3.7.4",
         "sharp": "^0.34.5",
-        "tailwindcss": "^3.4.17",
+        "tailwindcss": "^4.0.0",
         "typescript": "~5.6.2",
         "typescript-eslint": "^8.18.2",
         "vite": "^6.0.5",
@@ -119,19 +119,6 @@
       "dev": true,
       "license": "MIT"
     },
-    "node_modules/@alloc/quick-lru": {
-      "version": "5.2.0",
-      "resolved": "https://registry.npmjs.org/@alloc/quick-lru/-/quick-lru-5.2.0.tgz",
-      "integrity": "sha512-UrcABB+4bUrFABwbluTIBErXwvbsU/V7TZWfmbgJfbkwiBuziS9gxdODUyuiecfdGQ85jglMW6juS3+z5TsKLw==",
-      "dev": true,
-      "license": "MIT",
-      "engines": {
-        "node": ">=10"
-      },
-      "funding": {
-        "url": "https://github.com/sponsors/sindresorhus"
-      }
-    },
     "node_modules/@apocentre/alias-sampling": {
       "version": "0.5.3",
       "resolved": "https://registry.npmjs.org/@apocentre/alias-sampling/-/alias-sampling-0.5.3.tgz",
@@ -2216,44 +2203,6 @@
       ],
       "license": "MIT"
     },
-    "node_modules/@nodelib/fs.scandir": {
-      "version": "2.1.5",
-      "resolved": "https://registry.npmjs.org/@nodelib/fs.scandir/-/fs.scandir-2.1.5.tgz",
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-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
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-        "run-parallel": "^1.1.9"
-      },
-      "engines": {
-        "node": ">= 8"
-      }
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-    "node_modules/@nodelib/fs.stat": {
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-      "dev": true,
-      "license": "MIT",
-      "engines": {
-        "node": ">= 8"
-      }
-    },
-    "node_modules/@nodelib/fs.walk": {
-      "version": "1.2.8",
-      "resolved": "https://registry.npmjs.org/@nodelib/fs.walk/-/fs.walk-1.2.8.tgz",
-      "integrity": "sha512-oGB+UxlgWcgQkgwo8GcEGwemoTFt3FIO9ababBmaGwXIoBKZ+GTy0pP185beGg7Llih/NSHSV2XAs1lnznocSg==",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "@nodelib/fs.scandir": "2.1.5",
-        "fastq": "^1.6.0"
-      },
-      "engines": {
-        "node": ">= 8"
-      }
-    },
     "node_modules/@npmcli/git": {
       "version": "4.1.0",
       "resolved": "https://registry.npmjs.org/@npmcli/git/-/git-4.1.0.tgz",
@@ -4917,6 +4866,278 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/@tailwindcss/node": {
+      "version": "4.1.18",
+      "resolved": "https://registry.npmjs.org/@tailwindcss/node/-/node-4.1.18.tgz",
+      "integrity": "sha512-DoR7U1P7iYhw16qJ49fgXUlry1t4CpXeErJHnQ44JgTSKMaZUdf17cfn5mHchfJ4KRBZRFA/Coo+MUF5+gOaCQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@jridgewell/remapping": "^2.3.4",
+        "enhanced-resolve": "^5.18.3",
+        "jiti": "^2.6.1",
+        "lightningcss": "1.30.2",
+        "magic-string": "^0.30.21",
+        "source-map-js": "^1.2.1",
+        "tailwindcss": "4.1.18"
+      }
+    },
+    "node_modules/@tailwindcss/oxide": {
+      "version": "4.1.18",
+      "resolved": "https://registry.npmjs.org/@tailwindcss/oxide/-/oxide-4.1.18.tgz",
+      "integrity": "sha512-EgCR5tTS5bUSKQgzeMClT6iCY3ToqE1y+ZB0AKldj809QXk1Y+3jB0upOYZrn9aGIzPtUsP7sX4QQ4XtjBB95A==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">= 10"
+      },
+      "optionalDependencies": {
+        "@tailwindcss/oxide-android-arm64": "4.1.18",
+        "@tailwindcss/oxide-darwin-arm64": "4.1.18",
+        "@tailwindcss/oxide-darwin-x64": "4.1.18",
+        "@tailwindcss/oxide-freebsd-x64": "4.1.18",
+        "@tailwindcss/oxide-linux-arm-gnueabihf": "4.1.18",
+        "@tailwindcss/oxide-linux-arm64-gnu": "4.1.18",
+        "@tailwindcss/oxide-linux-arm64-musl": "4.1.18",
+        "@tailwindcss/oxide-linux-x64-gnu": "4.1.18",
+        "@tailwindcss/oxide-linux-x64-musl": "4.1.18",
+        "@tailwindcss/oxide-wasm32-wasi": "4.1.18",
+        "@tailwindcss/oxide-win32-arm64-msvc": "4.1.18",
+        "@tailwindcss/oxide-win32-x64-msvc": "4.1.18"
+      }
+    },
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+        "arm64"
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+      "dev": true,
+      "license": "MIT",
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+      "cpu": [
+        "arm64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "darwin"
+      ],
+      "engines": {
+        "node": ">= 10"
+      }
+    },
+    "node_modules/@tailwindcss/oxide-darwin-x64": {
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+      "cpu": [
+        "x64"
+      ],
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "darwin"
+      ],
+      "engines": {
+        "node": ">= 10"
+      }
+    },
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+        "x64"
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-      "dev": true,
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@@ -10999,27 +11020,6 @@
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-      "integrity": "sha512-NuaNSa6flKT5JaSYQzJok04JzTL1CA6aGhv5rfLW3PgqA+M2ChpZQnAC8h8i4ZFkBS8X5RqkDBHA7r4hej3K9A==",
-      "dev": true,
-      "funding": [
-        {
-          "type": "github",
-          "url": "https://github.com/sponsors/feross"
-        },
-        {
-          "type": "patreon",
-          "url": "https://www.patreon.com/feross"
-        },
-        {
-          "type": "consulting",
-          "url": "https://feross.org/support"
-        }
-      ],
-      "license": "MIT"
-    },
     "node_modules/rdndmb-html5-to-touch": {
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       "resolved": "https://registry.npmjs.org/rdndmb-html5-to-touch/-/rdndmb-html5-to-touch-8.1.2.tgz",
@@ -11347,16 +11347,6 @@
         "react-dom": ">=16 || >=17 || >= 18 || >=19"
       }
     },
-    "node_modules/read-cache": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/read-cache/-/read-cache-1.0.0.tgz",
-      "integrity": "sha512-Owdv/Ft7IjOgm/i0xvNDZ1LrRANRfew4b2prF3OWMQLxLfu3bS8FVhCsrSCMK4lR56Y9ya+AThoTpDCTxCmpRA==",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "pify": "^2.3.0"
-      }
-    },
     "node_modules/readdirp": {
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       "resolved": "https://registry.npmjs.org/readdirp/-/readdirp-4.1.2.tgz",
@@ -11487,27 +11477,6 @@
       "integrity": "sha512-NKN5kMDylKuldxYLSUfrbo5Tuzh4hd+2E8NPPX02mZtn1VuREQToYe/ZdlJy+J3uCpfaiGF05e7B8W0iXbQHmg==",
       "license": "ISC"
     },
-    "node_modules/resolve": {
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-      "resolved": "https://registry.npmjs.org/resolve/-/resolve-1.22.11.tgz",
-      "integrity": "sha512-RfqAvLnMl313r7c9oclB1HhUEAezcpLjz95wFH4LVuhk9JF/r22qmVP9AMmOU4vMX7Q8pN8jwNg/CSpdFnMjTQ==",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "is-core-module": "^2.16.1",
-        "path-parse": "^1.0.7",
-        "supports-preserve-symlinks-flag": "^1.0.0"
-      },
-      "bin": {
-        "resolve": "bin/resolve"
-      },
-      "engines": {
-        "node": ">= 0.4"
-      },
-      "funding": {
-        "url": "https://github.com/sponsors/ljharb"
-      }
-    },
     "node_modules/resolve-from": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/resolve-from/-/resolve-from-4.0.0.tgz",
@@ -11528,17 +11497,6 @@
         "node": ">= 4"
       }
     },
-    "node_modules/reusify": {
-      "version": "1.1.0",
-      "resolved": "https://registry.npmjs.org/reusify/-/reusify-1.1.0.tgz",
-      "integrity": "sha512-g6QUff04oZpHs0eG5p83rFLhHeV00ug/Yf9nZM6fLeUrPguBTkTQOdpAWWspMh55TZfVQDPaN3NQJfbVRAxdIw==",
-      "dev": true,
-      "license": "MIT",
-      "engines": {
-        "iojs": ">=1.0.0",
-        "node": ">=0.10.0"
-      }
-    },
     "node_modules/rollup": {
       "version": "4.53.3",
       "resolved": "https://registry.npmjs.org/rollup/-/rollup-4.53.3.tgz",
@@ -11587,30 +11545,6 @@
       "integrity": "sha512-UT5EDe2cu2E/6O4igUr5PSFs23nvvukicWHx6GnOPlHAiiYbzNuCRQCuiUdHJQcqKalLKlrYJnjY0ySGsXNQXQ==",
       "license": "MIT"
     },
-    "node_modules/run-parallel": {
-      "version": "1.2.0",
-      "resolved": "https://registry.npmjs.org/run-parallel/-/run-parallel-1.2.0.tgz",
-      "integrity": "sha512-5l4VyZR86LZ/lDxZTR6jqL8AFE2S0IFLMP26AbjsLVADxHdhB/c0GUsH+y39UfCi3dzz8OlQuPmnaJOMoDHQBA==",
-      "dev": true,
-      "funding": [
-        {
-          "type": "github",
-          "url": "https://github.com/sponsors/feross"
-        },
-        {
-          "type": "patreon",
-          "url": "https://www.patreon.com/feross"
-        },
-        {
-          "type": "consulting",
-          "url": "https://feross.org/support"
-        }
-      ],
-      "license": "MIT",
-      "dependencies": {
-        "queue-microtask": "^1.2.2"
-      }
-    },
     "node_modules/rxjs": {
       "version": "7.8.2",
       "resolved": "https://registry.npmjs.org/rxjs/-/rxjs-7.8.2.tgz",
@@ -12008,29 +11942,6 @@
         "inline-style-parser": "0.2.7"
       }
     },
-    "node_modules/sucrase": {
-      "version": "3.35.1",
-      "resolved": "https://registry.npmjs.org/sucrase/-/sucrase-3.35.1.tgz",
-      "integrity": "sha512-DhuTmvZWux4H1UOnWMB3sk0sbaCVOoQZjv8u1rDoTV0HTdGem9hkAZtl4JZy8P2z4Bg0nT+YMeOFyVr4zcG5Tw==",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "@jridgewell/gen-mapping": "^0.3.2",
-        "commander": "^4.0.0",
-        "lines-and-columns": "^1.1.6",
-        "mz": "^2.7.0",
-        "pirates": "^4.0.1",
-        "tinyglobby": "^0.2.11",
-        "ts-interface-checker": "^0.1.9"
-      },
-      "bin": {
-        "sucrase": "bin/sucrase",
-        "sucrase-node": "bin/sucrase-node"
-      },
-      "engines": {
-        "node": ">=16 || 14 >=14.17"
-      }
-    },
     "node_modules/supports-color": {
       "version": "7.2.0",
       "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-7.2.0.tgz",
@@ -12044,19 +11955,6 @@
         "node": ">=8"
       }
     },
-    "node_modules/supports-preserve-symlinks-flag": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/supports-preserve-symlinks-flag/-/supports-preserve-symlinks-flag-1.0.0.tgz",
-      "integrity": "sha512-ot0WnXS9fgdkgIcePe6RHNk1WA8+muPa6cSjeR3V8K27q9BB1rTE3R1p7Hv0z1ZyAc8s6Vvv8DIyWf681MAt0w==",
-      "dev": true,
-      "license": "MIT",
-      "engines": {
-        "node": ">= 0.4"
-      },
-      "funding": {
-        "url": "https://github.com/sponsors/ljharb"
-      }
-    },
     "node_modules/symbol-tree": {
       "version": "3.2.4",
       "resolved": "https://registry.npmjs.org/symbol-tree/-/symbol-tree-3.2.4.tgz",
@@ -12091,115 +11989,24 @@
       }
     },
     "node_modules/tailwindcss": {
-      "version": "3.4.18",
-      "resolved": "https://registry.npmjs.org/tailwindcss/-/tailwindcss-3.4.18.tgz",
-      "integrity": "sha512-6A2rnmW5xZMdw11LYjhcI5846rt9pbLSabY5XPxo+XWdxwZaFEn47Go4NzFiHu9sNNmr/kXivP1vStfvMaK1GQ==",
+      "version": "4.1.18",
+      "resolved": "https://registry.npmjs.org/tailwindcss/-/tailwindcss-4.1.18.tgz",
+      "integrity": "sha512-4+Z+0yiYyEtUVCScyfHCxOYP06L5Ne+JiHhY2IjR2KWMIWhJOYZKLSGZaP5HkZ8+bY0cxfzwDE5uOmzFXyIwxw==",
       "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "@alloc/quick-lru": "^5.2.0",
-        "arg": "^5.0.2",
-        "chokidar": "^3.6.0",
-        "didyoumean": "^1.2.2",
-        "dlv": "^1.1.3",
-        "fast-glob": "^3.3.2",
-        "glob-parent": "^6.0.2",
-        "is-glob": "^4.0.3",
-        "jiti": "^1.21.7",
-        "lilconfig": "^3.1.3",
-        "micromatch": "^4.0.8",
-        "normalize-path": "^3.0.0",
-        "object-hash": "^3.0.0",
-        "picocolors": "^1.1.1",
-        "postcss": "^8.4.47",
-        "postcss-import": "^15.1.0",
-        "postcss-js": "^4.0.1",
-        "postcss-load-config": "^4.0.2 || ^5.0 || ^6.0",
-        "postcss-nested": "^6.2.0",
-        "postcss-selector-parser": "^6.1.2",
-        "resolve": "^1.22.8",
-        "sucrase": "^3.35.0"
-      },
-      "bin": {
-        "tailwind": "lib/cli.js",
-        "tailwindcss": "lib/cli.js"
-      },
-      "engines": {
-        "node": ">=14.0.0"
-      }
+      "license": "MIT"
     },
-    "node_modules/tailwindcss/node_modules/chokidar": {
-      "version": "3.6.0",
-      "resolved": "https://registry.npmjs.org/chokidar/-/chokidar-3.6.0.tgz",
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+    "node_modules/tapable": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/tapable/-/tapable-2.3.0.tgz",
+      "integrity": "sha512-g9ljZiwki/LfxmQADO3dEY1CbpmXT5Hm2fJ+QaGKwSXUylMybePR7/67YW7jOrrvjEgL1Fmz5kzyAjWVWLlucg==",
       "dev": true,
       "license": "MIT",
-      "dependencies": {
-        "anymatch": "~3.1.2",
-        "braces": "~3.0.2",
-        "glob-parent": "~5.1.2",
-        "is-binary-path": "~2.1.0",
-        "is-glob": "~4.0.1",
-        "normalize-path": "~3.0.0",
-        "readdirp": "~3.6.0"
-      },
       "engines": {
-        "node": ">= 8.10.0"
+        "node": ">=6"
       },
       "funding": {
-        "url": "https://paulmillr.com/funding/"
-      },
-      "optionalDependencies": {
-        "fsevents": "~2.3.2"
-      }
-    },
-    "node_modules/tailwindcss/node_modules/chokidar/node_modules/glob-parent": {
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-      "dev": true,
-      "license": "ISC",
-      "dependencies": {
-        "is-glob": "^4.0.1"
-      },
-      "engines": {
-        "node": ">= 6"
-      }
-    },
-    "node_modules/tailwindcss/node_modules/readdirp": {
-      "version": "3.6.0",
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-      "integrity": "sha512-hOS089on8RduqdbhvQ5Z37A0ESjsqz6qnRcffsMU3495FuTdqSm+7bhJ29JvIOsBDEEnan5DPu9t3To9VRlMzA==",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "picomatch": "^2.2.1"
-      },
-      "engines": {
-        "node": ">=8.10.0"
-      }
-    },
-    "node_modules/thenify": {
-      "version": "3.3.1",
-      "resolved": "https://registry.npmjs.org/thenify/-/thenify-3.3.1.tgz",
-      "integrity": "sha512-RVZSIV5IG10Hk3enotrhvz0T9em6cyHBLkH/YAZuKqd8hRkKhSfCGIcP2KUY0EPxndzANBmNllzWPwak+bheSw==",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "any-promise": "^1.0.0"
-      }
-    },
-    "node_modules/thenify-all": {
-      "version": "1.6.0",
-      "resolved": "https://registry.npmjs.org/thenify-all/-/thenify-all-1.6.0.tgz",
-      "integrity": "sha512-RNxQH/qI8/t3thXJDwcstUO4zeqo64+Uy/+sNVRBx4Xn2OX+OZ9oP+iJnNFqplFra2ZUVeKCSa2oVWi3T4uVmA==",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "thenify": ">= 3.1.0 < 4"
-      },
-      "engines": {
-        "node": ">=0.8"
+        "type": "opencollective",
+        "url": "https://opencollective.com/webpack"
       }
     },
     "node_modules/tinybench": {
@@ -12306,19 +12113,6 @@
       "dev": true,
       "license": "MIT"
     },
-    "node_modules/to-regex-range": {
-      "version": "5.0.1",
-      "resolved": "https://registry.npmjs.org/to-regex-range/-/to-regex-range-5.0.1.tgz",
-      "integrity": "sha512-65P7iz6X5yEr1cwcgvQxbbIw7Uk3gOy5dIdtZ4rDveLqhrdJP+Li/Hx6tyK0NEb+2GCyneCMJiGqrADCSNk8sQ==",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "is-number": "^7.0.0"
-      },
-      "engines": {
-        "node": ">=8.0"
-      }
-    },
     "node_modules/totalist": {
       "version": "3.0.1",
       "resolved": "https://registry.npmjs.org/totalist/-/totalist-3.0.1.tgz",
@@ -12388,13 +12182,6 @@
         "typescript": ">=4.8.4"
       }
     },
-    "node_modules/ts-interface-checker": {
-      "version": "0.1.13",
-      "resolved": "https://registry.npmjs.org/ts-interface-checker/-/ts-interface-checker-0.1.13.tgz",
-      "integrity": "sha512-Y/arvbn+rrz3JCKl9C4kVNfTfSm2/mEp5FSz5EsZSANGPSlQrpRI5M4PKF+mJnE52jOO90PnPSc3Ur3bTQw0gA==",
-      "dev": true,
-      "license": "Apache-2.0"
-    },
     "node_modules/tslib": {
       "version": "2.8.1",
       "resolved": "https://registry.npmjs.org/tslib/-/tslib-2.8.1.tgz",
@@ -12644,13 +12431,6 @@
         "react": "^16.8.0 || ^17.0.0 || ^18.0.0 || ^19.0.0"
       }
     },
-    "node_modules/util-deprecate": {
-      "version": "1.0.2",
-      "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
-      "integrity": "sha512-EPD5q1uXyFxJpCrLnCc1nHnq3gOa6DZBocAIiI2TaSCA7VCJ1UJDMagCzIkXNsUYfD1daK//LTEQ8xiIbrHtcw==",
-      "dev": true,
-      "license": "MIT"
-    },
     "node_modules/uuid": {
       "version": "9.0.1",
       "resolved": "https://registry.npmjs.org/uuid/-/uuid-9.0.1.tgz",
diff --git a/package.json b/package.json
index ddb157a..8587bbc 100644
--- a/package.json
+++ b/package.json
@@ -101,7 +101,7 @@
     "@types/ws": "^8.18.1",
     "@vitejs/plugin-react": "^4.3.4",
     "@vitest/ui": "^4.0.15",
-    "autoprefixer": "^10.4.20",
+    "@tailwindcss/vite": "^4.0.0",
     "eslint": "^9.17.0",
     "eslint-config-prettier": "^10.1.8",
     "eslint-plugin-prettier": "^5.5.4",
@@ -114,7 +114,7 @@
     "postcss": "^8.4.49",
     "prettier": "^3.7.4",
     "sharp": "^0.34.5",
-    "tailwindcss": "^3.4.17",
+    "tailwindcss": "^4.0.0",
     "typescript": "~5.6.2",
     "typescript-eslint": "^8.18.2",
     "vite": "^6.0.5",
diff --git a/postcss.config.js b/postcss.config.js
index 2aa7205..127009c 100644
--- a/postcss.config.js
+++ b/postcss.config.js
@@ -1,6 +1,5 @@
+// PostCSS config - minimal since we use @tailwindcss/vite plugin
+// This file can be removed if no other PostCSS plugins are needed
 export default {
-  plugins: {
-    tailwindcss: {},
-    autoprefixer: {},
-  },
+  plugins: {},
 };
diff --git a/src/components/command-launcher.css b/src/components/command-launcher.css
index f38904e..a502e68 100644
--- a/src/components/command-launcher.css
+++ b/src/components/command-launcher.css
@@ -192,9 +192,9 @@
 }
 
 .command-list::-webkit-scrollbar-thumb {
-  background-color: rgba(255, 255, 255, 0.2);
+  background-color: hsl(var(--scrollbar-thumb));
 }
 
 .command-list::-webkit-scrollbar-thumb:hover {
-  background-color: rgba(255, 255, 255, 0.3);
+  background-color: hsl(var(--scrollbar-thumb-hover));
 }
diff --git a/src/index.css b/src/index.css
index a99bf46..3eaecef 100644
--- a/src/index.css
+++ b/src/index.css
@@ -1,11 +1,262 @@
+/* Tailwind CSS v4 - CSS-first configuration */
+@import "tailwindcss";
+
 /* Prism syntax highlighting theme */
 @import "./styles/prism-theme.css";
 
-@tailwind base;
-@tailwind components;
-@tailwind utilities;
+/* ==========================================================================
+   Theme Configuration (@theme)
+   These define Tailwind's design tokens - colors, fonts, animations, etc.
+   They reference the runtime CSS variables set by ThemeProvider.
+   ========================================================================== */
+
+@theme {
+  /* Font Family */
+  --font-mono: "Oxygen Mono", monospace;
+
+  /* Border Radius - using CSS variable for runtime theming */
+  --radius-lg: var(--radius);
+  --radius-md: calc(var(--radius) - 2px);
+  --radius-sm: calc(var(--radius) - 4px);
+
+  /* Animations */
+  --animate-accordion-down: accordion-down 0.2s ease-out;
+  --animate-accordion-up: accordion-up 0.2s ease-out;
+  --animate-skeleton-pulse: skeleton-pulse 1.5s ease-in-out infinite;
+
+  @keyframes accordion-down {
+    from {
+      height: 0;
+    }
+    to {
+      height: var(--radix-accordion-content-height);
+    }
+  }
+
+  @keyframes accordion-up {
+    from {
+      height: var(--radix-accordion-content-height);
+    }
+    to {
+      height: 0;
+    }
+  }
+
+  @keyframes skeleton-pulse {
+    0%,
+    100% {
+      opacity: 1;
+    }
+    50% {
+      opacity: 0.5;
+    }
+  }
+
+  /* ==========================================================================
+     Color Tokens
+     These map runtime CSS variables (set by ThemeProvider) to Tailwind colors.
+     The runtime variables use HSL values WITHOUT the hsl() wrapper.
+     ========================================================================== */
+
+  /* Core Colors */
+  --color-background: hsl(var(--background));
+  --color-foreground: hsl(var(--foreground));
+
+  /* Card */
+  --color-card: hsl(var(--card));
+  --color-card-foreground: hsl(var(--card-foreground));
+
+  /* Popover */
+  --color-popover: hsl(var(--popover));
+  --color-popover-foreground: hsl(var(--popover-foreground));
+
+  /* Primary */
+  --color-primary: hsl(var(--primary));
+  --color-primary-foreground: hsl(var(--primary-foreground));
+
+  /* Secondary */
+  --color-secondary: hsl(var(--secondary));
+  --color-secondary-foreground: hsl(var(--secondary-foreground));
+
+  /* Accent */
+  --color-accent: hsl(var(--accent));
+  --color-accent-foreground: hsl(var(--accent-foreground));
+
+  /* Muted */
+  --color-muted: hsl(var(--muted));
+  --color-muted-foreground: hsl(var(--muted-foreground));
+
+  /* Destructive */
+  --color-destructive: hsl(var(--destructive));
+  --color-destructive-foreground: hsl(var(--destructive-foreground));
+
+  /* Form Elements */
+  --color-border: hsl(var(--border));
+  --color-input: hsl(var(--input));
+  --color-ring: hsl(var(--ring));
+
+  /* Status Colors */
+  --color-success: hsl(var(--success));
+  --color-warning: hsl(var(--warning));
+  --color-info: hsl(var(--info));
+
+  /* Nostr-specific Colors */
+  --color-zap: hsl(var(--zap));
+  --color-live: hsl(var(--live));
+  --color-highlight: hsl(var(--highlight));
+
+  /* Tooltip */
+  --color-tooltip: hsl(var(--tooltip));
+  --color-tooltip-foreground: hsl(var(--tooltip-foreground));
+}
+
+/* ==========================================================================
+   Runtime Theme Variables
+   These are HSL values WITHOUT the hsl() wrapper, allowing alpha transparency.
+   Set dynamically by ThemeProvider via applyTheme().
+   ========================================================================== */
+
+:root {
+  /* Core colors - light theme defaults (overridden by ThemeProvider) */
+  --background: 0 0% 100%;
+  --foreground: 222.2 84% 4.9%;
+  --card: 0 0% 100%;
+  --card-foreground: 222.2 84% 4.9%;
+  --popover: 0 0% 100%;
+  --popover-foreground: 222.2 84% 4.9%;
+  --primary: 222.2 47.4% 11.2%;
+  --primary-foreground: 210 40% 98%;
+  --secondary: 210 40% 96.1%;
+  --secondary-foreground: 222.2 47.4% 11.2%;
+  --muted: 210 40% 96.1%;
+  --muted-foreground: 215.4 16.3% 46.9%;
+  --accent: 210 40% 96.1%;
+  --accent-foreground: 222.2 47.4% 11.2%;
+  --destructive: 0 84.2% 60.2%;
+  --destructive-foreground: 210 40% 98%;
+  --border: 214.3 31.8% 91.4%;
+  --input: 214.3 31.8% 91.4%;
+  --ring: 222.2 84% 4.9%;
+  --radius: 0.5rem;
+
+  /* Status colors */
+  --success: 142 76% 36%;
+  --warning: 45 93% 47%;
+  --info: 199 89% 48%;
+
+  /* Nostr-specific colors */
+  --zap: 45 93% 40%;
+  --live: 0 72% 45%;
+
+  /* UI highlight (active user, self-references) */
+  --highlight: 25 90% 35%;
+
+  /* Tooltip colors */
+  --tooltip: 222.2 47.4% 11.2%;
+  --tooltip-foreground: 210 40% 98%;
+
+  /* Syntax highlighting */
+  --syntax-comment: 215.4 16.3% 46.9%;
+  --syntax-punctuation: 222.2 84% 30%;
+  --syntax-property: 222.2 47.4% 11.2%;
+  --syntax-string: 142 60% 30%;
+  --syntax-keyword: 270 80% 50%;
+  --syntax-function: 222.2 47.4% 11.2%;
+  --syntax-variable: 222.2 84% 4.9%;
+  --syntax-operator: 222.2 84% 20%;
+
+  /* Diff colors */
+  --diff-inserted: 142 60% 30%;
+  --diff-inserted-bg: 142 60% 50% / 0.15;
+  --diff-deleted: 0 70% 45%;
+  --diff-deleted-bg: 0 70% 50% / 0.15;
+  --diff-meta: 199 80% 40%;
+  --diff-meta-bg: 199 80% 50% / 0.1;
+
+  /* Scrollbar */
+  --scrollbar-thumb: 222.2 84% 4.9% / 0.2;
+  --scrollbar-thumb-hover: 222.2 84% 4.9% / 0.3;
+  --scrollbar-track: 0 0% 0% / 0;
+
+  /* Gradient colors (RGB values) */
+  --gradient-1: 234 179 8;
+  --gradient-2: 249 115 22;
+  --gradient-3: 147 51 234;
+  --gradient-4: 6 182 212;
+}
+
+/* Dark theme - applied via .dark class or ThemeProvider */
+.dark {
+  --background: 222.2 84% 4.9%;
+  --foreground: 210 40% 98%;
+  --card: 222.2 84% 4.9%;
+  --card-foreground: 210 40% 98%;
+  --popover: 222.2 84% 4.9%;
+  --popover-foreground: 210 40% 98%;
+  --primary: 210 40% 98%;
+  --primary-foreground: 222.2 47.4% 11.2%;
+  --secondary: 217.2 32.6% 17.5%;
+  --secondary-foreground: 210 40% 98%;
+  --muted: 217.2 32.6% 17.5%;
+  --muted-foreground: 215 20.2% 70%;
+  --accent: 270 100% 70%;
+  --accent-foreground: 222.2 84% 4.9%;
+  --destructive: 0 75% 75%;
+  --destructive-foreground: 210 40% 98%;
+  --border: 217.2 32.6% 17.5%;
+  --input: 217.2 32.6% 17.5%;
+  --ring: 212.7 26.8% 83.9%;
+
+  /* Status colors */
+  --success: 142 76% 46%;
+  --warning: 38 92% 60%;
+  --info: 199 89% 58%;
+
+  /* Nostr-specific colors */
+  --zap: 45 93% 58%;
+  --live: 0 72% 51%;
+
+  /* UI highlight (active user, self-references) */
+  --highlight: 27 96% 61%;
+
+  /* Tooltip colors */
+  --tooltip: 217.2 32.6% 30%;
+  --tooltip-foreground: 210 40% 98%;
+
+  /* Syntax highlighting */
+  --syntax-comment: 215 20.2% 70%;
+  --syntax-punctuation: 210 40% 70%;
+  --syntax-property: 210 40% 98%;
+  --syntax-string: 215 20.2% 70%;
+  --syntax-keyword: 210 40% 98%;
+  --syntax-function: 210 40% 98%;
+  --syntax-variable: 210 40% 98%;
+  --syntax-operator: 210 40% 98%;
+
+  /* Diff colors */
+  --diff-inserted: 134 60% 76%;
+  --diff-inserted-bg: 145 63% 42% / 0.1;
+  --diff-deleted: 0 100% 76%;
+  --diff-deleted-bg: 0 100% 60% / 0.1;
+  --diff-meta: 190 77% 70%;
+  --diff-meta-bg: 190 77% 70% / 0.08;
+
+  /* Scrollbar */
+  --scrollbar-thumb: 0 0% 100% / 0.2;
+  --scrollbar-thumb-hover: 0 0% 100% / 0.3;
+  --scrollbar-track: 0 0% 0% / 0;
+
+  /* Gradient colors (RGB values) */
+  --gradient-1: 250 204 21;
+  --gradient-2: 251 146 60;
+  --gradient-3: 168 85 247;
+  --gradient-4: 34 211 238;
+}
+
+/* ==========================================================================
+   Custom Scrollbar Styling
+   ========================================================================== */
 
-/* Custom scrollbar styling - uses theme variables */
 * {
   scrollbar-width: thin;
   scrollbar-color: hsl(var(--scrollbar-thumb)) hsl(var(--scrollbar-track));
@@ -29,144 +280,9 @@
   background-color: hsl(var(--scrollbar-thumb-hover));
 }
 
-@layer base {
-  :root {
-    /* Core colors - light theme defaults (overridden by ThemeProvider) */
-    --background: 0 0% 100%;
-    --foreground: 222.2 84% 4.9%;
-    --card: 0 0% 100%;
-    --card-foreground: 222.2 84% 4.9%;
-    --popover: 0 0% 100%;
-    --popover-foreground: 222.2 84% 4.9%;
-    --primary: 222.2 47.4% 11.2%;
-    --primary-foreground: 210 40% 98%;
-    --secondary: 210 40% 96.1%;
-    --secondary-foreground: 222.2 47.4% 11.2%;
-    --muted: 210 40% 96.1%;
-    --muted-foreground: 215.4 16.3% 46.9%;
-    --accent: 210 40% 96.1%;
-    --accent-foreground: 222.2 47.4% 11.2%;
-    --destructive: 0 84.2% 60.2%;
-    --destructive-foreground: 210 40% 98%;
-    --border: 214.3 31.8% 91.4%;
-    --input: 214.3 31.8% 91.4%;
-    --ring: 222.2 84% 4.9%;
-    --radius: 0.5rem;
-
-    /* Status colors */
-    --success: 142 76% 36%;
-    --warning: 45 93% 47%;
-    --info: 199 89% 48%;
-
-    /* Nostr-specific colors */
-    --zap: 45 93% 40%;
-    --live: 0 72% 45%;
-
-    /* UI highlight (active user, self-references) */
-    --highlight: 25 90% 35%;
-
-    /* Tooltip colors */
-    --tooltip: 222.2 47.4% 11.2%;
-    --tooltip-foreground: 210 40% 98%;
-
-    /* Syntax highlighting */
-    --syntax-comment: 215.4 16.3% 46.9%;
-    --syntax-punctuation: 222.2 84% 30%;
-    --syntax-property: 222.2 47.4% 11.2%;
-    --syntax-string: 142 60% 30%;
-    --syntax-keyword: 270 80% 50%;
-    --syntax-function: 222.2 47.4% 11.2%;
-    --syntax-variable: 222.2 84% 4.9%;
-    --syntax-operator: 222.2 84% 20%;
-
-    /* Diff colors */
-    --diff-inserted: 142 60% 30%;
-    --diff-inserted-bg: 142 60% 50% / 0.15;
-    --diff-deleted: 0 70% 45%;
-    --diff-deleted-bg: 0 70% 50% / 0.15;
-    --diff-meta: 199 80% 40%;
-    --diff-meta-bg: 199 80% 50% / 0.1;
-
-    /* Scrollbar */
-    --scrollbar-thumb: 222.2 84% 4.9% / 0.2;
-    --scrollbar-thumb-hover: 222.2 84% 4.9% / 0.3;
-    --scrollbar-track: 0 0% 0% / 0;
-
-    /* Gradient colors (RGB values) */
-    --gradient-1: 234 179 8;
-    --gradient-2: 249 115 22;
-    --gradient-3: 147 51 234;
-    --gradient-4: 6 182 212;
-  }
-
-  /* Dark theme - applied via .dark class or ThemeProvider */
-  .dark {
-    --background: 222.2 84% 4.9%;
-    --foreground: 210 40% 98%;
-    --card: 222.2 84% 4.9%;
-    --card-foreground: 210 40% 98%;
-    --popover: 222.2 84% 4.9%;
-    --popover-foreground: 210 40% 98%;
-    --primary: 210 40% 98%;
-    --primary-foreground: 222.2 47.4% 11.2%;
-    --secondary: 217.2 32.6% 17.5%;
-    --secondary-foreground: 210 40% 98%;
-    --muted: 217.2 32.6% 17.5%;
-    --muted-foreground: 215 20.2% 70%;
-    --accent: 270 100% 70%;
-    --accent-foreground: 222.2 84% 4.9%;
-    --destructive: 0 75% 75%;
-    --destructive-foreground: 210 40% 98%;
-    --border: 217.2 32.6% 17.5%;
-    --input: 217.2 32.6% 17.5%;
-    --ring: 212.7 26.8% 83.9%;
-
-    /* Status colors */
-    --success: 142 76% 46%;
-    --warning: 38 92% 60%;
-    --info: 199 89% 58%;
-
-    /* Nostr-specific colors */
-    --zap: 45 93% 58%;
-    --live: 0 72% 51%;
-
-    /* UI highlight (active user, self-references) */
-    --highlight: 27 96% 61%;
-
-    /* Tooltip colors */
-    --tooltip: 217.2 32.6% 30%;
-    --tooltip-foreground: 210 40% 98%;
-
-    /* Syntax highlighting */
-    --syntax-comment: 215 20.2% 70%;
-    --syntax-punctuation: 210 40% 70%;
-    --syntax-property: 210 40% 98%;
-    --syntax-string: 215 20.2% 70%;
-    --syntax-keyword: 210 40% 98%;
-    --syntax-function: 210 40% 98%;
-    --syntax-variable: 210 40% 98%;
-    --syntax-operator: 210 40% 98%;
-
-    /* Diff colors */
-    --diff-inserted: 134 60% 76%;
-    --diff-inserted-bg: 145 63% 42% / 0.1;
-    --diff-deleted: 0 100% 76%;
-    --diff-deleted-bg: 0 100% 60% / 0.1;
-    --diff-meta: 190 77% 70%;
-    --diff-meta-bg: 190 77% 70% / 0.08;
-
-    /* Scrollbar */
-    --scrollbar-thumb: 0 0% 100% / 0.2;
-    --scrollbar-thumb-hover: 0 0% 100% / 0.3;
-    --scrollbar-track: 0 0% 0% / 0;
-
-    /* Gradient colors (RGB values) */
-    --gradient-1: 250 204 21;
-    --gradient-2: 251 146 60;
-    --gradient-3: 168 85 247;
-    --gradient-4: 34 211 238;
-  }
-}
+/* ==========================================================================
+   Base Layer - Global Styles
+   ========================================================================== */
 
 @layer base {
   * {
@@ -182,30 +298,46 @@
   }
 }
 
-@layer utilities {
-  .no-scrollbar::-webkit-scrollbar {
-    display: none;
-  }
-  .no-scrollbar {
-    -ms-overflow-style: none;
-    scrollbar-width: none;
-  }
+/* ==========================================================================
+   Custom Utilities (v4 @utility syntax)
+   ========================================================================== */
 
-  .text-grimoire-gradient {
-    background: linear-gradient(
-      to bottom,
-      rgb(var(--gradient-1)),
-      rgb(var(--gradient-2)),
-      rgb(var(--gradient-3)),
-      rgb(var(--gradient-4))
-    );
-    background-clip: text;
-    -webkit-background-clip: text;
-    -webkit-text-fill-color: transparent;
+@utility no-scrollbar {
+  -ms-overflow-style: none;
+  scrollbar-width: none;
+
+  &::-webkit-scrollbar {
+    display: none;
   }
 }
 
-/* react-medium-image-zoom theme customization - uses background with opacity */
+@utility hide-scrollbar {
+  -ms-overflow-style: none;
+  scrollbar-width: none;
+
+  &::-webkit-scrollbar {
+    display: none;
+  }
+}
+
+@utility text-grimoire-gradient {
+  background: linear-gradient(
+    to bottom,
+    rgb(var(--gradient-1)),
+    rgb(var(--gradient-2)),
+    rgb(var(--gradient-3)),
+    rgb(var(--gradient-4))
+  );
+  background-clip: text;
+  -webkit-background-clip: text;
+  -webkit-text-fill-color: transparent;
+}
+
+/* ==========================================================================
+   Third-Party Component Overrides
+   ========================================================================== */
+
+/* react-medium-image-zoom theme customization */
 [data-rmiz-modal-overlay] {
   background-color: hsl(var(--background) / 0.92) !important;
 }
@@ -214,7 +346,10 @@
   box-shadow: 0 0 40px hsl(var(--foreground) / 0.2);
 }
 
-/* React Mosaic Theme Customization */
+/* ==========================================================================
+   React Mosaic Theme Customization
+   ========================================================================== */
+
 .mosaic.mosaic-blueprint-theme.mosaic-blueprint-theme {
   background: hsl(var(--background));
 }
@@ -235,16 +370,19 @@ body.animating-layout
 .mosaic.mosaic-blueprint-theme.mosaic-blueprint-theme
   .mosaic-window
   .mosaic-window-toolbar {
-  background: hsl(var(--background));
+  background: hsl(var(--muted));
   border: none;
   border-bottom: 1px solid hsl(var(--border));
   border-radius: 0;
+  color: hsl(var(--foreground));
+  height: 30px;
 }
 
 .mosaic.mosaic-blueprint-theme.mosaic-blueprint-theme
   .mosaic-window
   .mosaic-window-title {
   color: hsl(var(--foreground));
+  font-family: inherit;
 }
 
 .mosaic.mosaic-blueprint-theme.mosaic-blueprint-theme .mosaic-window {
@@ -267,23 +405,6 @@ body.animating-layout
   box-shadow: none;
 }
 
-.mosaic.mosaic-blueprint-theme.mosaic-blueprint-theme
-  .mosaic-window
-  .mosaic-window-toolbar {
-  background: hsl(var(--muted));
-  border: none;
-  border-bottom: 1px solid hsl(var(--border));
-  color: hsl(var(--foreground));
-  height: 30px;
-}
-
-.mosaic.mosaic-blueprint-theme.mosaic-blueprint-theme
-  .mosaic-window
-  .mosaic-window-title {
-  color: hsl(var(--foreground));
-  font-family: inherit;
-}
-
 .mosaic.mosaic-blueprint-theme.mosaic-blueprint-theme
   .mosaic-window
   .mosaic-window-body {
@@ -336,7 +457,10 @@ body.animating-layout
   margin: -2px 0;
 }
 
-/* Accessibility: Focus indicators for keyboard navigation */
+/* ==========================================================================
+   Accessibility: Focus Indicators
+   ========================================================================== */
+
 @layer base {
   /* Focus-visible for buttons and interactive elements */
   button:focus-visible,
@@ -367,7 +491,10 @@ body.animating-layout
   }
 }
 
-/* TipTap Editor Styles */
+/* ==========================================================================
+   TipTap Editor Styles
+   ========================================================================== */
+
 .ProseMirror {
   min-height: 1.25rem;
   line-height: 1.25rem;
@@ -451,16 +578,6 @@ body.animating-layout
   background-color: hsl(var(--primary) / 0.15);
 }
 
-/* Hide scrollbar utility */
-.hide-scrollbar {
-  scrollbar-width: none; /* Firefox */
-  -ms-overflow-style: none; /* IE/Edge */
-}
-
-.hide-scrollbar::-webkit-scrollbar {
-  display: none; /* Chrome/Safari/Opera */
-}
-
 /* Hide scrollbar in RichEditor */
 .rich-editor .ProseMirror {
   scrollbar-width: none; /* Firefox */
diff --git a/tailwind.config.js b/tailwind.config.js
deleted file mode 100644
index d4561a9..0000000
--- a/tailwind.config.js
+++ /dev/null
@@ -1,86 +0,0 @@
-/** @type {import('tailwindcss').Config} */
-export default {
-  darkMode: ["class"],
-  content: ["./index.html", "./src/**/*.{js,ts,jsx,tsx}"],
-  theme: {
-    extend: {
-      fontFamily: {
-        mono: ['"Oxygen Mono"', "monospace"],
-      },
-      borderRadius: {
-        lg: "var(--radius)",
-        md: "calc(var(--radius) - 2px)",
-        sm: "calc(var(--radius) - 4px)",
-      },
-      keyframes: {
-        "accordion-down": {
-          from: { height: "0" },
-          to: { height: "var(--radix-accordion-content-height)" },
-        },
-        "accordion-up": {
-          from: { height: "var(--radix-accordion-content-height)" },
-          to: { height: "0" },
-        },
-        "skeleton-pulse": {
-          "0%, 100%": { opacity: "1" },
-          "50%": { opacity: "0.5" },
-        },
-      },
-      animation: {
-        "accordion-down": "accordion-down 0.2s ease-out",
-        "accordion-up": "accordion-up 0.2s ease-out",
-        "skeleton-pulse": "skeleton-pulse 1.5s ease-in-out infinite",
-      },
-      colors: {
-        background: "hsl(var(--background))",
-        foreground: "hsl(var(--foreground))",
-        card: {
-          DEFAULT: "hsl(var(--card))",
-          foreground: "hsl(var(--card-foreground))",
-        },
-        popover: {
-          DEFAULT: "hsl(var(--popover))",
-          foreground: "hsl(var(--popover-foreground))",
-        },
-        primary: {
-          DEFAULT: "hsl(var(--primary))",
-          foreground: "hsl(var(--primary-foreground))",
-        },
-        secondary: {
-          DEFAULT: "hsl(var(--secondary))",
-          foreground: "hsl(var(--secondary-foreground))",
-        },
-        muted: {
-          DEFAULT: "hsl(var(--muted))",
-          foreground: "hsl(var(--muted-foreground))",
-        },
-        accent: {
-          DEFAULT: "hsl(var(--accent))",
-          foreground: "hsl(var(--accent-foreground))",
-        },
-        destructive: {
-          DEFAULT: "hsl(var(--destructive))",
-          foreground: "hsl(var(--destructive-foreground))",
-        },
-        border: "hsl(var(--border))",
-        input: "hsl(var(--input))",
-        ring: "hsl(var(--ring))",
-        // Status colors
-        success: "hsl(var(--success))",
-        warning: "hsl(var(--warning))",
-        info: "hsl(var(--info))",
-        // Nostr-specific colors
-        zap: "hsl(var(--zap))",
-        live: "hsl(var(--live))",
-        // UI highlight (active user, self-references)
-        highlight: "hsl(var(--highlight))",
-        // Tooltip colors
-        tooltip: {
-          DEFAULT: "hsl(var(--tooltip))",
-          foreground: "hsl(var(--tooltip-foreground))",
-        },
-      },
-    },
-  },
-  plugins: [],
-};
diff --git a/vite.config.ts b/vite.config.ts
index 0001036..d039a94 100644
--- a/vite.config.ts
+++ b/vite.config.ts
@@ -1,5 +1,6 @@
 import { defineConfig } from "vite";
 import react from "@vitejs/plugin-react";
+import tailwindcss from "@tailwindcss/vite";
 import path from "node:path";
 import { fileURLToPath } from "node:url";
 
@@ -7,7 +8,7 @@ const __dirname = path.dirname(fileURLToPath(import.meta.url));
 
 // https://vite.dev/config/
 export default defineConfig({
-  plugins: [react()],
+  plugins: [react(), tailwindcss()],
   resolve: {
     alias: {
       "@": path.resolve(__dirname, "./src"),