diff --git a/README.md b/README.md
index 532b3ba..dfb0a0a 100644
--- a/README.md
+++ b/README.md
@@ -81,7 +81,7 @@ Open [http://localhost:3000](http://localhost:3000) in your browser.
 
 1. **Iframe-based preview** - Uses `srcdoc` with strict sandboxing for security. This shows how the email renders in a modern browser, not specific email clients.
 
-2. **Regex-based CSS extraction** - Simple and fast for the MVP. Could be upgraded to PostCSS for more robust parsing.
+2. **PostCSS-based CSS extraction** - Uses PostCSS with safe-parser for robust CSS parsing, handling nested rules, @-rules, and malformed CSS gracefully.
 
 3. **Client-side analysis** - All processing happens in the browser. The caniemail data is fetched once and cached.
 
@@ -116,8 +116,13 @@ For true cross-client preview screenshots, commercial tools like [Litmus](https:
 - [Next.js 16](https://nextjs.org) - React framework
 - [TypeScript](https://typescriptlang.org) - Type safety
 - [Tailwind CSS](https://tailwindcss.com) - Styling
+- [PostCSS](https://postcss.org) - CSS parsing
 - [caniemail.com](https://caniemail.com) - Compatibility data
 
+## Author
+
+**Dominik Hryshaiev** - [LinkedIn](https://www.linkedin.com/in/domhhv) · [GitHub](https://github.com/domhhv)
+
 ## License
 
 MIT
@@ -125,5 +130,3 @@ MIT
 ## Acknowledgments
 
 - [caniemail.com](https://www.caniemail.com) for their comprehensive email client support data
-- [Resend](https://resend.com) for the interesting challenge
-- [Email favicon](https://www.flaticon.com/free-icon/email_9840614?term=mail&page=1&position=53&origin=search&related_id=9840614) is created by [lakonicon](https://www.flaticon.com/authors/lakonicon) on Flaticon
diff --git a/src/app/favicon.ico b/src/app/favicon.ico
index 9769b2c..6a4c629 100644
Binary files a/src/app/favicon.ico and b/src/app/favicon.ico differ
diff --git a/src/app/globals.css b/src/app/globals.css
index 9390f63..05247c4 100644
--- a/src/app/globals.css
+++ b/src/app/globals.css
@@ -44,30 +44,31 @@
 }
 
 :root {
-  --radius: 0.625rem;
-  --background: oklch(1 0 0);
-  --foreground: oklch(0.129 0.042 264.695);
-  --card: oklch(1 0 0);
-  --card-foreground: oklch(0.129 0.042 264.695);
-  --popover: oklch(1 0 0);
-  --popover-foreground: oklch(0.129 0.042 264.695);
-  --primary: oklch(0.208 0.042 265.755);
-  --primary-foreground: oklch(0.984 0.003 247.858);
-  --secondary: oklch(0.968 0.007 247.896);
-  --secondary-foreground: oklch(0.208 0.042 265.755);
-  --muted: oklch(0.968 0.007 247.896);
-  --muted-foreground: oklch(0.554 0.046 257.417);
-  --accent: oklch(0.968 0.007 247.896);
-  --accent-foreground: oklch(0.208 0.042 265.755);
-  --destructive: oklch(0.577 0.245 27.325);
-  --border: oklch(0.929 0.013 255.508);
-  --input: oklch(0.929 0.013 255.508);
-  --ring: oklch(0.704 0.04 256.788);
-  --chart-1: oklch(0.646 0.222 41.116);
-  --chart-2: oklch(0.6 0.118 184.704);
-  --chart-3: oklch(0.398 0.07 227.392);
-  --chart-4: oklch(0.828 0.189 84.429);
-  --chart-5: oklch(0.769 0.188 70.08);
+  --radius: 0.5rem;
+  --background: oklch(0.982 0 161.565);
+  --foreground: oklch(0.244 0 169.695);
+  --muted: oklch(0.952 0 165.964);
+  --muted-foreground: oklch(0.503 0 180);
+  --popover: oklch(0.991 0 180);
+  --popover-foreground: oklch(0.244 0 169.695);
+  --card: oklch(0.991 0 180);
+  --card-foreground: oklch(0.244 0 169.695);
+  --border: oklch(0.882 0 180);
+  --input: oklch(0.955 0 180);
+  --primary: oklch(0.689 0.19 45.166);
+  --primary-foreground: oklch(1 0 180);
+  --secondary: oklch(0.92 0.065 74.362);
+  --secondary-foreground: oklch(0.35 0.069 40.827);
+  --accent: oklch(0.931 0 171.254);
+  --accent-foreground: oklch(0.244 0 169.695);
+  --destructive: oklch(0.627 0.194 33.336);
+  --destructive-foreground: oklch(1 0 180);
+  --ring: oklch(0.745 0.132 54.33);
+  --chart-1: oklch(0.689 0.19 45.166);
+  --chart-2: oklch(0.92 0.065 74.362);
+  --chart-3: oklch(0.931 0 171.254);
+  --chart-4: oklch(0.936 0.052 74.572);
+  --chart-5: oklch(0.693 0.195 44.608);
   --sidebar: oklch(0.984 0.003 247.858);
   --sidebar-foreground: oklch(0.129 0.042 264.695);
   --sidebar-primary: oklch(0.208 0.042 265.755);
@@ -79,29 +80,31 @@
 }
 
 .dark {
-  --background: oklch(0.129 0.042 264.695);
-  --foreground: oklch(0.984 0.003 247.858);
-  --card: oklch(0.208 0.042 265.755);
-  --card-foreground: oklch(0.984 0.003 247.858);
-  --popover: oklch(0.208 0.042 265.755);
-  --popover-foreground: oklch(0.984 0.003 247.858);
-  --primary: oklch(0.929 0.013 255.508);
-  --primary-foreground: oklch(0.208 0.042 265.755);
-  --secondary: oklch(0.279 0.041 260.031);
-  --secondary-foreground: oklch(0.984 0.003 247.858);
-  --muted: oklch(0.279 0.041 260.031);
-  --muted-foreground: oklch(0.704 0.04 256.788);
-  --accent: oklch(0.279 0.041 260.031);
-  --accent-foreground: oklch(0.984 0.003 247.858);
-  --destructive: oklch(0.704 0.191 22.216);
-  --border: oklch(1 0 0 / 10%);
-  --input: oklch(1 0 0 / 15%);
-  --ring: oklch(0.551 0.027 264.364);
-  --chart-1: oklch(0.488 0.243 264.376);
-  --chart-2: oklch(0.696 0.17 162.48);
-  --chart-3: oklch(0.769 0.188 70.08);
-  --chart-4: oklch(0.627 0.265 303.9);
-  --chart-5: oklch(0.645 0.246 16.439);
+  --radius: 0.5rem;
+  --background: oklch(0.178 0 180);
+  --foreground: oklch(0.949 0 180);
+  --muted: oklch(0.252 0 180);
+  --muted-foreground: oklch(0.77 0 141.34);
+  --popover: oklch(0.213 0 168.69);
+  --popover-foreground: oklch(0.949 0 180);
+  --card: oklch(0.213 0 168.69);
+  --card-foreground: oklch(0.949 0 180);
+  --border: oklch(0.235 0.011 90.394);
+  --input: oklch(0.402 0 195.945);
+  --primary: oklch(0.689 0.19 45.166);
+  --primary-foreground: oklch(1 0 180);
+  --secondary: oklch(0.258 0.045 60.789);
+  --secondary-foreground: oklch(0.925 0.052 66.177);
+  --accent: oklch(0.285 0 168.69);
+  --accent-foreground: oklch(0.949 0 180);
+  --destructive: oklch(0.627 0.194 33.336);
+  --destructive-foreground: oklch(1 0 180);
+  --ring: oklch(0.541 0.116 50.039);
+  --chart-1: oklch(0.689 0.19 45.166);
+  --chart-2: oklch(0.258 0.045 60.789);
+  --chart-3: oklch(0.285 0 168.69);
+  --chart-4: oklch(0.294 0.053 60.297);
+  --chart-5: oklch(0.693 0.195 44.608);
   --sidebar: oklch(0.208 0.042 265.755);
   --sidebar-foreground: oklch(0.984 0.003 247.858);
   --sidebar-primary: oklch(0.488 0.243 264.376);
diff --git a/src/components/custom/email-content-input.tsx b/src/components/custom/email-content-input.tsx
index 1fd86b6..a759076 100644
--- a/src/components/custom/email-content-input.tsx
+++ b/src/components/custom/email-content-input.tsx
@@ -8,7 +8,6 @@ import { useTheme } from 'next-themes';
 import * as React from 'react';
 
 import { TooltipButton } from '@/components/custom/tooltip-button';
-import { Button } from '@/components/ui/button';
 import { Kbd, KbdGroup } from '@/components/ui/kbd';
 import { useHasKeyboard } from '@/hooks/use-has-keyboard';
 import { useModifierKeys } from '@/hooks/use-modifier-keys';
@@ -82,16 +81,22 @@ export function EmailContentInput({ onChange, placeholder = 'Paste your HTML ema
             <BrushCleaningIcon className="size-4" />
           </TooltipButton>
         ) : (
-          <Button size="sm" variant="secondary" onClick={fillSample}>
+          <TooltipButton
+            size="sm"
+            variant="default"
+            onClick={fillSample}
+            tooltip="Fill input with sample email HTML for quick compatibility preview"
+            aria-label="Fill input with sample email HTML for quick compatibility preview"
+          >
             {isFocused && hasKeyboard && (
               <KbdGroup className="mr-2">
-                <Kbd className="bg-background">{mod}</Kbd>
-                <Kbd className="bg-background">{shift}</Kbd>
-                <Kbd className="bg-background">E</Kbd>
+                <Kbd>{mod}</Kbd>
+                <Kbd>{shift}</Kbd>
+                <Kbd>E</Kbd>
               </KbdGroup>
             )}
             <span>Try Sample</span>
-          </Button>
+          </TooltipButton>
         )}
       </div>
       <div className="min-h-0 flex-1 overflow-auto">
diff --git a/src/components/layout/footer.tsx b/src/components/layout/footer.tsx
index 5e5b665..54ef0f4 100644
--- a/src/components/layout/footer.tsx
+++ b/src/components/layout/footer.tsx
@@ -9,20 +9,33 @@ type FooterProps = {
 
 export function Footer({ canIEmailData }: FooterProps) {
   return (
-    <footer className="border-border flex flex-col border-t px-6 py-3 text-center text-xs text-slate-400 md:flex-row md:justify-center md:text-center dark:text-slate-500">
-      <span>
-        Compatibility data powered by{' '}
-        <Link target="_blank" rel="noopener noreferrer" href="https://www.caniemail.com">
-          caniemail.com
-        </Link>
-        {canIEmailData && ` (${canIEmailData.data.length} features)`}
-      </span>
-      <span>
-        <span className="hidden md:inline-block">&nbsp;⋅&nbsp;</span>Email favicon created by lakonicon on{' '}
-        <Link target="_blank" rel="noopener noreferrer" href="https://www.flaticon.com/free-icons/email">
-          Flaticon
-        </Link>
-      </span>
+    <footer className="border-border flex flex-col gap-1 border-t px-6 py-3 text-center text-xs text-slate-400 dark:text-slate-500">
+      <div className="flex items-center justify-center gap-1.5">
+        <span>
+          Built by{' '}
+          <Link
+            target="_blank"
+            rel="noopener noreferrer"
+            href="https://www.linkedin.com/in/domhhv"
+            className="font-medium text-slate-600 hover:text-slate-800 dark:text-slate-300 dark:hover:text-slate-100"
+          >
+            Dominik Hryshaiev
+          </Link>
+        </span>
+        <span className="rounded-full bg-emerald-100 px-2 py-0.5 text-[10px] font-medium text-emerald-700 dark:bg-emerald-900/30 dark:text-emerald-400">
+          <span className="mr-1 inline-block size-1.5 animate-pulse rounded-full bg-emerald-500 align-middle" />
+          Available for hire
+        </span>
+      </div>
+      <div className="flex flex-col md:flex-row md:justify-center">
+        <span>
+          Compatibility data powered by{' '}
+          <Link target="_blank" rel="noopener noreferrer" href="https://www.caniemail.com">
+            caniemail.com
+          </Link>
+          {canIEmailData && ` (${canIEmailData.data.length} features)`}
+        </span>
+      </div>
     </footer>
   );
 }