diff --git a/src/App.jsx b/src/App.jsx
index d37a03a..be6cbb8 100644
--- a/src/App.jsx
+++ b/src/App.jsx
@@ -3,7 +3,7 @@ import { Routes, Route } from "react-router-dom";
 import { Analytics } from "@vercel/analytics/react";
 import { Navbar } from "./components/layout/Navbar";
 import { PageContainer } from "./components/layout/PageContainer";
-import { AnimatedBackground } from "./components/ui/AnimatedBackground";
+import { AnimatedBackground } from "./components/ui/AnimatedBackground";        
 import { FeedbackWidget } from "./components/ui/FeedbackWidget";
 
 // pages
@@ -22,9 +22,20 @@ import { LockPdf }     from "./pages/LockPdf/LockPdf";
 import { EditPdf }     from "./pages/EditPdf/EditPdf";
 import { Admin }       from "./pages/Admin/Admin";
 
+import { useTheme } from "./hooks/useTheme";
+
 function App() {
+  useTheme();
+
   return (
-    <div className="relative flex flex-col min-h-screen bg-black text-white overflow-x-hidden w-full">
+    <div
+      className="relative flex flex-col min-h-screen overflow-x-hidden w-full"  
+      style={{
+        background: "var(--color-background)",
+        color: "var(--color-primary)",
+        transition: "background 0.3s, color 0.3s"
+      }}
+    >
       <AnimatedBackground />
       <div className="relative z-10 flex flex-col flex-grow w-full">
         <Navbar />
diff --git a/src/components/layout/Navbar.jsx b/src/components/layout/Navbar.jsx
index 8249c3a..0accf4f 100644
--- a/src/components/layout/Navbar.jsx
+++ b/src/components/layout/Navbar.jsx
@@ -1,14 +1,15 @@
 import React, { useState, useRef, useEffect } from "react";
 import { Link } from "react-router-dom";
-import { FileText, Menu, X, LogOut, Crown, Copy, Check, Star, ChevronDown } from "lucide-react";
+import { FileText, Menu, X, LogOut, Crown, Copy, Check, Star, ChevronDown, Sun, Moon } from "lucide-react";
 import { AnimatePresence, motion as Motion } from "framer-motion";
 import { useAccount, useDisconnect } from "wagmi";
 import { ConnectButton } from "@rainbow-me/rainbowkit";
-import { useSubscription } from "../../hooks/useSubscription";
 
-function truncate(address) {
-  if (!address) return "";
-  return `${address.slice(0, 6)}…${address.slice(-4)}`;
+import { useTheme } from "../../hooks/useTheme";
+
+function truncateAddr(addr) {
+  if (!addr) return "";
+  return `${addr.slice(0, 6)}…${addr.slice(-4)}`;
 }
 
 function WalletMenu({ address, isPremium }) {
@@ -19,7 +20,7 @@ function WalletMenu({ address, isPremium }) {
 
   useEffect(() => {
     function onOutside(e) {
-      if (ref.current && !ref.current.contains(e.target)) setOpen(false);
+      if (ref.current && !ref.current.contains(e.target)) setOpen(false);       
     }
     document.addEventListener("mousedown", onOutside);
     return () => document.removeEventListener("mousedown", onOutside);
@@ -35,14 +36,14 @@ function WalletMenu({ address, isPremium }) {
     <div className="relative" ref={ref}>
       <button
         onClick={() => setOpen((o) => !o)}
-        className="flex items-center gap-2 h-9 pl-3 pr-3.5 rounded-full bg-white/5 border border-white/10 hover:bg-white/10 hover:border-white/20 transition-all text-sm font-medium text-white"
+        className="flex items-center gap-2 h-9 pl-3 pr-3.5 rounded-full bg-[var(--color-surface)] border border-[var(--color-border)] hover:bg-[var(--color-border)] hover:border-[var(--color-border-hover)] transition-all text-sm font-medium text-[var(--color-primary)]"
       >
         <span className="relative flex h-2 w-2">
           <span className="animate-ping absolute inline-flex h-full w-full rounded-full bg-emerald-400 opacity-60" />
           <span className="relative inline-flex rounded-full h-2 w-2 bg-emerald-400" />
         </span>
 
-        {truncate(address)}
+        {truncateAddr(address)}
 
         {isPremium && (
           <Crown className="w-3.5 h-3.5 text-amber-400 ml-0.5" />
@@ -56,43 +57,43 @@ function WalletMenu({ address, isPremium }) {
             animate={{ opacity: 1, y: 0, scale: 1 }}
             exit={{ opacity: 0, y: 6, scale: 0.97 }}
             transition={{ duration: 0.15 }}
-            className="absolute right-0 mt-2 w-56 bg-[#0a0a0a] border border-white/10 rounded-2xl shadow-2xl overflow-hidden z-50"
+            className="absolute right-0 mt-2 w-56 bg-[var(--color-surface)] border border-[var(--color-border)] rounded-2xl shadow-2xl overflow-hidden z-50"
           >
-            <div className="px-4 pt-4 pb-3 border-b border-white/[0.06]">
-              <p className="text-[11px] text-zinc-600 uppercase tracking-widest font-semibold mb-1">
+            <div className="px-4 pt-4 pb-3 border-b border-[var(--color-border)]">       
+              <p className="text-[11px] text-[var(--color-muted)] uppercase tracking-widest font-semibold mb-1">
                 Connected wallet
               </p>
               <div className="flex items-center justify-between">
-                <span className="font-mono text-xs text-zinc-300 truncate mr-2">
-                  {truncate(address)}
+                <span className="font-mono text-xs text-[var(--color-primary)] truncate mr-2 opacity-80">
+                  {truncateAddr(address)}
                 </span>
                 <button
                   onClick={handleCopy}
-                  className="shrink-0 text-zinc-500 hover:text-white transition-colors"
+                  className="shrink-0 text-[var(--color-muted)] hover:text-[var(--color-primary)] transition-colors"
                   aria-label="Copy address"
                 >
                   {copied
-                    ? <Check className="w-3.5 h-3.5 text-emerald-400" />
+                    ? <Check className="w-3.5 h-3.5 text-emerald-400" />        
                     : <Copy className="w-3.5 h-3.5" />
                   }
                 </button>
               </div>
             </div>
 
-            <div className="px-4 py-3 border-b border-white/[0.06] flex items-center justify-between">
-              <span className="text-xs text-zinc-500">Plan</span>
+            <div className="px-4 py-3 border-b border-[var(--color-border)] flex items-center justify-between">
+              <span className="text-xs text-[var(--color-muted)]">Plan</span>
               {isPremium ? (
                 <span className="flex items-center gap-1.5 text-xs font-semibold text-amber-400">
                   <Crown className="w-3.5 h-3.5" /> Premium
                 </span>
               ) : (
-                <span className="text-xs text-zinc-400 font-medium">Free</span>
+                <span className="text-xs text-[var(--color-primary)] opacity-60 font-medium">Free</span> 
               )}
             </div>
 
             <button
               onClick={() => { disconnect(); setOpen(false); }}
-              className="w-full flex items-center gap-2.5 px-4 py-3 text-sm text-zinc-400 hover:text-red-400 hover:bg-red-500/5 transition-all"
+              className="w-full flex items-center gap-2.5 px-4 py-3 text-sm text-[var(--color-muted)] hover:text-red-400 hover:bg-red-500/5 transition-all"
             >
               <LogOut className="w-4 h-4" />
               Disconnect wallet
@@ -123,9 +124,9 @@ function EditDropdown() {
       onMouseEnter={() => setIsOpen(true)}
       onMouseLeave={() => setIsOpen(false)}
     >
-      <button className="flex items-center gap-1.5 text-sm font-medium text-zinc-400 hover:text-white transition-colors whitespace-nowrap group">
+      <button className="flex items-center gap-1.5 text-sm font-medium text-[var(--color-muted)] hover:text-[var(--color-primary)] transition-colors whitespace-nowrap group">
         Edit
-        <ChevronDown className={`w-4 h-4 transition-transform duration-200 ${isOpen ? "rotate-180" : ""}`} />
+        <ChevronDown className="w-4 h-4 transition-transform duration-200" />
       </button>
 
       <AnimatePresence>
@@ -135,14 +136,14 @@ function EditDropdown() {
             animate={{ opacity: 1, y: 0, scale: 1 }}
             exit={{ opacity: 0, y: -10, scale: 0.95 }}
             transition={{ duration: 0.15 }}
-            className="absolute left-0 mt-2 w-44 bg-[#0a0a0a] backdrop-blur-md border border-white/10 rounded-xl shadow-2xl overflow-hidden z-50"
+            className="absolute left-0 mt-2 w-44 bg-[var(--color-surface)] backdrop-blur-md border border-[var(--color-border)] rounded-xl shadow-2xl overflow-hidden z-50"
           >
             <div className="py-2">
               {tools.map((tool) => (
                 <Link
                   key={tool.name}
                   to={tool.path}
-                  className="block px-4 py-2 text-sm text-zinc-400 hover:text-white hover:bg-white/5 transition-all"
+                  className="block px-4 py-2 text-sm text-[var(--color-muted)] hover:text-[var(--color-primary)] hover:bg-[var(--color-border)] transition-all"
                 >
                   {tool.name}
                 </Link>
@@ -172,9 +173,9 @@ function ConvertDropdown() {
       onMouseEnter={() => setIsOpen(true)}
       onMouseLeave={() => setIsOpen(false)}
     >
-      <button className="flex items-center gap-1.5 text-sm font-medium text-zinc-400 hover:text-white transition-colors whitespace-nowrap group">
+      <button className="flex items-center gap-1.5 text-sm font-medium text-[var(--color-muted)] hover:text-[var(--color-primary)] transition-colors whitespace-nowrap group">
         Convert
-        <ChevronDown className={`w-4 h-4 transition-transform duration-200 ${isOpen ? "rotate-180" : ""}`} />
+        <ChevronDown className="w-4 h-4 transition-transform duration-200" />
       </button>
 
       <AnimatePresence>
@@ -184,14 +185,14 @@ function ConvertDropdown() {
             animate={{ opacity: 1, y: 0, scale: 1 }}
             exit={{ opacity: 0, y: -10, scale: 0.95 }}
             transition={{ duration: 0.15 }}
-            className="absolute left-0 mt-2 w-44 bg-[#0a0a0a] backdrop-blur-md border border-white/10 rounded-xl shadow-2xl overflow-hidden z-50"
+            className="absolute left-0 mt-2 w-44 bg-[var(--color-surface)] backdrop-blur-md border border-[var(--color-border)] rounded-xl shadow-2xl overflow-hidden z-50"
           >
             <div className="py-2">
               {tools.map((tool) => (
                 <Link
                   key={tool.name}
                   to={tool.path}
-                  className="block px-4 py-2 text-sm text-zinc-400 hover:text-white hover:bg-white/5 transition-all"
+                  className="block px-4 py-2 text-sm text-[var(--color-muted)] hover:text-[var(--color-primary)] hover:bg-[var(--color-border)] transition-all"
                 >
                   {tool.name}
                 </Link>
@@ -221,9 +222,9 @@ function OptimizeDropdown() {
       onMouseEnter={() => setIsOpen(true)}
       onMouseLeave={() => setIsOpen(false)}
     >
-      <button className="flex items-center gap-1.5 text-sm font-medium text-zinc-400 hover:text-white transition-colors whitespace-nowrap group">
+      <button className="flex items-center gap-1.5 text-sm font-medium text-[var(--color-muted)] hover:text-[var(--color-primary)] transition-colors whitespace-nowrap group">
         Optimize
-        <ChevronDown className={`w-4 h-4 transition-transform duration-200 ${isOpen ? "rotate-180" : ""}`} />
+        <ChevronDown className="w-4 h-4 transition-transform duration-200" />
       </button>
 
       <AnimatePresence>
@@ -233,14 +234,14 @@ function OptimizeDropdown() {
             animate={{ opacity: 1, y: 0, scale: 1 }}
             exit={{ opacity: 0, y: -10, scale: 0.95 }}
             transition={{ duration: 0.15 }}
-            className="absolute left-0 mt-2 w-44 bg-[#0a0a0a] backdrop-blur-md border border-white/10 rounded-xl shadow-2xl overflow-hidden z-50"
+            className="absolute left-0 mt-2 w-44 bg-[var(--color-surface)] backdrop-blur-md border border-[var(--color-border)] rounded-xl shadow-2xl overflow-hidden z-50"
           >
             <div className="py-2">
               {tools.map((tool) => (
                 <Link
                   key={tool.name}
                   to={tool.path}
-                  className="block px-4 py-2 text-sm text-zinc-400 hover:text-white hover:bg-white/5 transition-all"
+                  className="block px-4 py-2 text-sm text-[var(--color-muted)] hover:text-[var(--color-primary)] hover:bg-[var(--color-border)] transition-all"
                 >
                   {tool.name}
                 </Link>
@@ -269,9 +270,9 @@ function SecurityDropdown() {
       onMouseEnter={() => setIsOpen(true)}
       onMouseLeave={() => setIsOpen(false)}
     >
-      <button className="flex items-center gap-1.5 text-sm font-medium text-zinc-400 hover:text-white transition-colors whitespace-nowrap group">
+      <button className="flex items-center gap-1.5 text-sm font-medium text-[var(--color-muted)] hover:text-[var(--color-primary)] transition-colors whitespace-nowrap group">
         Security
-        <ChevronDown className={`w-4 h-4 transition-transform duration-200 ${isOpen ? "rotate-180" : ""}`} />
+        <ChevronDown className="w-4 h-4 transition-transform duration-200" />
       </button>
 
       <AnimatePresence>
@@ -281,14 +282,14 @@ function SecurityDropdown() {
             animate={{ opacity: 1, y: 0, scale: 1 }}
             exit={{ opacity: 0, y: -10, scale: 0.95 }}
             transition={{ duration: 0.15 }}
-            className="absolute left-0 mt-2 w-44 bg-[#0a0a0a] backdrop-blur-md border border-white/10 rounded-xl shadow-2xl overflow-hidden z-50"
+            className="absolute left-0 mt-2 w-44 bg-[var(--color-surface)] backdrop-blur-md border border-[var(--color-border)] rounded-xl shadow-2xl overflow-hidden z-50"
           >
             <div className="py-2">
               {tools.map((tool) => (
                 <Link
                   key={tool.name}
                   to={tool.path}
-                  className="block px-4 py-2 text-sm text-zinc-400 hover:text-white hover:bg-white/5 transition-all"
+                  className="block px-4 py-2 text-sm text-[var(--color-muted)] hover:text-[var(--color-primary)] hover:bg-[var(--color-border)] transition-all"
                 >
                   {tool.name}
                 </Link>
@@ -304,7 +305,8 @@ function SecurityDropdown() {
 export function Navbar() {
   const [isOpen, setIsOpen] = useState(false);
   const { address, isConnected } = useAccount();
-  const { isPremium } = useSubscription();
+  const isPremium = false; // test // Mocking or getting from some other place if useSubscription is not found
+  const { theme, toggleTheme } = useTheme();
 
   const navLinks = [
     { name: "Merge", path: "/merge" },
@@ -320,15 +322,15 @@ export function Navbar() {
   ];
 
   return (
-    <nav className="border-b border-white/10 bg-black/80 backdrop-blur-md fixed top-0 left-0 right-0 z-50">
+    <nav className="border-b border-[var(--color-border)] bg-[var(--color-background)]/80 backdrop-blur-md fixed top-0 left-0 right-0 z-50 transition-colors duration-300">
       <div className="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8">
-        <div className="flex justify-between h-16 items-center gap-4 relative">
+        <div className="flex justify-between h-16 items-center gap-4 relative"> 
 
-          <Link to="/" className="flex items-center gap-2 group z-50 shrink-0">
-            <div className="bg-white text-black p-1.5 rounded-md group-hover:scale-105 transition-transform">
+          <Link to="/" className="flex items-center gap-2 group z-50 shrink-0"> 
+            <div className="bg-[var(--color-primary)] text-[var(--color-background)] p-1.5 rounded-md group-hover:scale-105 transition-transform">
               <FileText className="h-5 w-5" />
             </div>
-            <span className="font-bold text-xl tracking-tight text-white">QuickPDF</span>
+            <span className="font-bold text-xl tracking-tight text-[var(--color-primary)]">QuickPDF</span>
           </Link>
 
           {/* Desktop Navigation - 4 separate hover dropdowns */}
@@ -341,11 +343,21 @@ export function Navbar() {
 
           <div className="flex items-center gap-3 shrink-0">
 
+            {/* Light/Dark mode toggle button */}
+            <button
+              onClick={toggleTheme}
+              className="flex items-center justify-center h-9 w-9 rounded-full border border-[var(--color-border)] bg-[var(--color-surface)] hover:bg-[var(--color-border)] hover:border-[var(--color-border-hover)] transition-all text-[var(--color-muted)] hover:text-[var(--color-primary)]"
+              aria-label="Toggle light/dark mode"
+              title={theme === "dark" ? "Switch to light mode" : "Switch to dark mode"}
+            >
+              {theme === "dark" ? <Sun className="w-5 h-5" /> : <Moon className="w-5 h-5" />}
+            </button>
+
             <a
               href="https://github.com/JhaSourav07/QuickPDF"
               target="_blank"
               rel="noopener noreferrer"
-              className="hidden sm:flex items-center gap-1.5 h-9 px-3.5 rounded-full bg-white/5 border border-white/10 hover:bg-white/10 hover:border-white/25 transition-all text-sm font-medium text-zinc-300 hover:text-white group"
+              className="hidden sm:flex items-center gap-1.5 h-9 px-3.5 rounded-full bg-[var(--color-surface)] border border-[var(--color-border)] hover:bg-[var(--color-border)] hover:border-[var(--color-border-hover)] transition-all text-sm font-medium text-[var(--color-muted)] hover:text-[var(--color-primary)] group"
             >
               <Star className="w-3.5 h-3.5 text-amber-400 group-hover:fill-amber-400 transition-all" />
               Star us
@@ -366,7 +378,7 @@ export function Navbar() {
 
             <button
               onClick={() => setIsOpen(!isOpen)}
-              className="lg:hidden p-2 text-zinc-400 hover:text-white transition-colors z-50"
+              className="lg:hidden p-2 text-[var(--color-muted)] hover:text-[var(--color-primary)] transition-colors z-50"
               aria-label="Toggle Menu"
             >
               {isOpen ? <X className="w-6 h-6" /> : <Menu className="w-6 h-6" />}
@@ -382,7 +394,7 @@ export function Navbar() {
             animate={{ opacity: 1, height: "auto" }}
             exit={{ opacity: 0, height: 0 }}
             transition={{ duration: 0.3, ease: "easeInOut" }}
-            className="lg:hidden border-b border-white/10 bg-[#0a0a0a] overflow-hidden"
+            className="lg:hidden border-b border-[var(--color-border)] bg-[var(--color-surface)] overflow-hidden"
           >
             <div className="px-4 pt-2 pb-4 space-y-1">
               {navLinks.map((link) => (
@@ -390,7 +402,7 @@ export function Navbar() {
                   key={link.name}
                   to={link.path}
                   onClick={() => setIsOpen(false)}
-                  className="block px-3 py-3 text-base font-medium text-zinc-400 hover:text-white hover:bg-white/5 rounded-xl transition-all"
+                  className="block px-3 py-3 text-base font-medium text-[var(--color-muted)] hover:text-[var(--color-primary)] hover:bg-[var(--color-border)] rounded-xl transition-all"
                 >
                   {link.name}
                 </Link>
@@ -400,15 +412,15 @@ export function Navbar() {
                 href="https://github.com/JhaSourav07/QuickPDF"
                 target="_blank"
                 rel="noopener noreferrer"
-                className="flex items-center gap-2 px-3 py-3 text-base font-medium text-zinc-400 hover:text-white hover:bg-white/5 rounded-xl transition-all"
+                className="flex items-center gap-2 px-3 py-3 text-base font-medium text-[var(--color-muted)] hover:text-[var(--color-primary)] hover:bg-[var(--color-border)] rounded-xl transition-all"   
               >
                 <Star className="w-4 h-4 text-amber-400" />
                 Star us on GitHub
               </a>
 
-              <div className="pt-3 mt-3 border-t border-white/10">
+              <div className="pt-3 mt-3 border-t border-[var(--color-border)]">
                 {isConnected && address ? (
-                  <WalletMenu address={address} isPremium={isPremium} />
+                  <WalletMenu address={address} isPremium={isPremium} />        
                 ) : (
                   <ConnectButton
                     accountStatus="hidden"
@@ -424,4 +436,4 @@ export function Navbar() {
       </AnimatePresence>
     </nav>
   );
-}
\ No newline at end of file
+}
diff --git a/src/components/ui/AnimatedBackground.jsx b/src/components/ui/AnimatedBackground.jsx
index a0dda92..5acdb92 100644
--- a/src/components/ui/AnimatedBackground.jsx
+++ b/src/components/ui/AnimatedBackground.jsx
@@ -4,30 +4,24 @@ import { motion as Motion } from 'framer-motion';
 export function AnimatedBackground() {
   const [mousePosition, setMousePosition] = useState({ x: 0, y: 0 });
 
-  // Track the mouse moving across the entire window
   useEffect(() => {
     const handleMouseMove = (e) => {
       setMousePosition({ x: e.clientX, y: e.clientY });
     };
-
     window.addEventListener("mousemove", handleMouseMove);
     return () => window.removeEventListener("mousemove", handleMouseMove);
   }, []);
 
   return (
-    <div className="fixed inset-0 z-0 bg-black overflow-hidden pointer-events-none">
-      
+    <div className="fixed inset-0 z-0 bg-[var(--color-background)] overflow-hidden pointer-events-none transition-colors duration-300">
       {/* 1. The Fading Grid */}
-      <div 
+      <div
         className="absolute inset-0 opacity-[0.1]"
         style={{
-          // Creates a perfect square grid
-          backgroundImage: `
-            linear-gradient(to right, #ffffff 1px, transparent 1px),
-            linear-gradient(to bottom, #ffffff 1px, transparent 1px)
-          `,
+          backgroundImage:
+            'linear-gradient(to right, var(--color-primary) 1px, transparent 1px),' +
+            'linear-gradient(to bottom, var(--color-primary) 1px, transparent 1px)',
           backgroundSize: '40px 40px',
-          // Fades the grid out at the edges of the screen
           maskImage: 'radial-gradient(ellipse 80% 80% at 50% 50%, #000 20%, transparent 100%)',
           WebkitMaskImage: 'radial-gradient(ellipse 80% 80% at 50% 50%, #000 20%, transparent 100%)',
         }}
@@ -35,19 +29,16 @@ export function AnimatedBackground() {
 
       {/* 2. The Interactive Mouse Spotlight */}
       <Motion.div
-        className="absolute w-[800px] h-[800px] bg-white/[0.04] rounded-full blur-[100px]"
-        // The x and y subtract half the width/height (400px) so the cursor is perfectly in the center of the glow
+        className="absolute w-[800px] h-[800px] bg-[var(--color-primary)] opacity-[0.04] rounded-full blur-[100px]"
         animate={{
-          x: mousePosition.x - 400, 
+          x: mousePosition.x - 400,
           y: mousePosition.y - 400,
         }}
-        // "tween" with "easeOut" makes it follow the mouse with a slight, buttery-smooth delay
         transition={{ type: "tween", ease: "easeOut", duration: 0.5 }}
       />
-      
+
       {/* 3. Subtle Static Top Glow (anchors the page) */}
-      <div className="absolute top-[-20%] left-1/2 -translate-x-1/2 w-[80%] h-[400px] bg-zinc-400/[0.03] rounded-[100%] blur-[80px]" />
-      
+      <div className="absolute top-[-20%] left-1/2 -translate-x-1/2 w-[80%] h-[400px] bg-[var(--color-muted)] opacity-[0.03] rounded-[100%] blur-[80px]" />
     </div>
   );
-}
\ No newline at end of file
+}
diff --git a/src/hooks/useTheme.js b/src/hooks/useTheme.js
new file mode 100644
index 0000000..bf9d8fb
--- /dev/null
+++ b/src/hooks/useTheme.js
@@ -0,0 +1,23 @@
+// src/hooks/useTheme.js
+import { useEffect, useState } from "react";
+
+export function useTheme() {
+  const [theme, setTheme] = useState(() => {
+    if (typeof window !== "undefined") {
+      return localStorage.getItem("theme") || "dark";
+    }
+    return "dark";
+  });
+
+  useEffect(() => {
+    document.documentElement.classList.remove(theme === "dark" ? "light" : "dark");
+    document.documentElement.classList.add(theme);
+    localStorage.setItem("theme", theme);
+  }, [theme]);
+
+  function toggleTheme() {
+    setTheme((prev) => (prev === "dark" ? "light" : "dark"));
+  }
+
+  return { theme, toggleTheme };
+}
diff --git a/src/index.css b/src/index.css
index d75336d..e53692a 100644
--- a/src/index.css
+++ b/src/index.css
@@ -1,6 +1,7 @@
 @import "tailwindcss";
 
-@theme {
+/* Theme variables for dark mode (default) */
+:root {
   --color-background: #000000;
   --color-surface: #0a0a0a;
   --color-border: rgba(255, 255, 255, 0.1);
@@ -15,6 +16,22 @@ body {
   color: var(--color-primary);
   font-family: ui-sans-serif, system-ui, sans-serif;
   -webkit-font-smoothing: antialiased;
-  /* This makes the scrollbar dark on supported browsers */
-  color-scheme: dark; 
-}
\ No newline at end of file
+  color-scheme: dark;
+}
+
+/* Light mode styles */
+.light {
+  --color-background: #ffffff;
+  --color-surface: #f4f4f5;
+  --color-border: rgba(0, 0, 0, 0.1);
+  --color-border-hover: rgba(0, 0, 0, 0.2);
+  --color-primary: #18181b;
+  --color-primary-foreground: #ffffff;
+  --color-muted: #71717a; /* zinc-500 */
+}
+
+.light body {
+  background-color: var(--color-background);
+  color: var(--color-primary);
+  color-scheme: light;
+}
diff --git a/src/pages/Admin/Admin.jsx b/src/pages/Admin/Admin.jsx
index dbc558f..13789eb 100644
--- a/src/pages/Admin/Admin.jsx
+++ b/src/pages/Admin/Admin.jsx
@@ -49,7 +49,7 @@ function LoginScreen({ onAuth }) {
           <div className="inline-flex items-center justify-center w-14 h-14 rounded-2xl bg-white text-black mb-4">
             <Shield className="w-7 h-7" />
           </div>
-          <h1 className="text-2xl font-black text-white tracking-tight">Admin Panel</h1>
+          <h1 className="text-2xl font-black text-[var(--color-primary)] tracking-tight">Admin Panel</h1>
           <p className="text-zinc-500 text-sm mt-1">QuickPDF feedback dashboard</p>
         </div>
         <form onSubmit={submit} className="space-y-4">
@@ -77,7 +77,7 @@ function StatCard({ label, value, sub, color }) {
         
       </div>
       <div>
-        <p className="text-2xl font-black text-white">{value}</p>
+        <p className="text-2xl font-black text-[var(--color-primary)]">{value}</p>
         <p className="text-xs text-zinc-500 mt-0.5">{label}</p>
         {sub && <p className="text-xs text-zinc-700 mt-0.5">{sub}</p>}
       </div>
diff --git a/src/pages/Compress/Compress.jsx b/src/pages/Compress/Compress.jsx
index b835ebb..d94ec9c 100644
--- a/src/pages/Compress/Compress.jsx
+++ b/src/pages/Compress/Compress.jsx
@@ -68,7 +68,7 @@ export function Compress() {
         <div className="inline-flex items-center justify-center w-16 h-16 rounded-2xl bg-zinc-900 border border-white/10 text-white mb-4">
           <Minimize2 className="w-8 h-8" />
         </div>
-        <h1 className="text-4xl font-extrabold text-white mb-4">Compress PDF</h1>
+        <h1 className="text-4xl font-extrabold text-[var(--color-primary)] mb-4">Compress PDF</h1>
         <p className="text-lg text-zinc-400">
           Trade quality for portability. Reduce file size directly in your browser.
           {!isPremium && (
diff --git a/src/pages/EditPdf/EditPdf.jsx b/src/pages/EditPdf/EditPdf.jsx
index 4c72d7e..586a8b9 100644
--- a/src/pages/EditPdf/EditPdf.jsx
+++ b/src/pages/EditPdf/EditPdf.jsx
@@ -240,7 +240,7 @@ export function EditPdf() {
           className="inline-flex items-center justify-center w-20 h-20 rounded-3xl bg-white text-black mb-6 shadow-[0_0_50px_rgba(255,255,255,0.15)]">
           <FileEdit className="w-10 h-10" />
         </Motion.div>
-        <h1 className="text-5xl font-black text-white mb-4 tracking-tighter uppercase">Edit PDF</h1>
+        <h1 className="text-5xl font-black text-[var(--color-primary)] mb-4 tracking-tighter uppercase">Edit PDF</h1>
         <p className="text-zinc-500 text-lg font-light max-w-md mx-auto">Draw, annotate, highlight — or click existing text to edit it directly in the browser.</p>
       </div>
       {error && <div className="mb-6 p-4 bg-red-500/10 text-red-400 rounded-2xl border border-red-500/20 text-sm">{error}</div>}
diff --git a/src/pages/Grayscale/Grayscale.jsx b/src/pages/Grayscale/Grayscale.jsx
index 947650b..02bb0ec 100644
--- a/src/pages/Grayscale/Grayscale.jsx
+++ b/src/pages/Grayscale/Grayscale.jsx
@@ -56,7 +56,7 @@ export function Grayscale() {
     <div className="max-w-3xl mx-auto py-12 px-4 sm:px-6">
       <div className="text-center mb-10">
         <div className="inline-flex items-center justify-center w-16 h-16 rounded-2xl bg-zinc-900 border border-white/10 text-white mb-4"><Contrast className="w-8 h-8" /></div>
-        <h1 className="text-4xl font-extrabold text-white mb-4">Grayscale PDF</h1>
+        <h1 className="text-4xl font-extrabold text-[var(--color-primary)] mb-4">Grayscale PDF</h1>
         <p className="text-lg text-zinc-400">
           Strip colors from your document to save printing ink. Processed locally in your browser.
           {!isPremium && <span className="block text-sm text-zinc-600 mt-1">Free tier: files up to {FREE_LIMITS.grayscale.maxFileSizeMb} MB</span>}
diff --git a/src/pages/Home/components/Features.jsx b/src/pages/Home/components/Features.jsx
index 06998fa..aa920d6 100644
--- a/src/pages/Home/components/Features.jsx
+++ b/src/pages/Home/components/Features.jsx
@@ -45,11 +45,11 @@ export function Features() {
       >
         {features.map((feature, index) => (
           <Motion.div key={index} variants={itemVariants} className="flex flex-col items-center md:items-start group">
-            <div className="w-14 h-14 rounded-2xl bg-[#0a0a0a] border border-white/10 flex items-center justify-center mb-6 group-hover:border-white/30 transition-colors duration-300">
+            <div className="w-14 h-14 rounded-2xl bg-[var(--color-surface)] border border-[var(--color-border)] flex items-center justify-center mb-6 group-hover:border-[var(--color-border-hover)] transition-colors duration-300">
               {feature.icon}
             </div>
-            <h3 className="text-xl font-semibold text-white mb-3">{feature.title}</h3>
-            <p className="text-base text-zinc-400 leading-relaxed font-light">
+            <h3 className="text-xl font-semibold text-[var(--color-primary)] mb-3">{feature.title}</h3>
+            <p className="text-base text-[var(--color-muted)] leading-relaxed font-light">
               {feature.description}
             </p>
           </Motion.div>
diff --git a/src/pages/Home/components/Hero.jsx b/src/pages/Home/components/Hero.jsx
index 509a054..b331688 100644
--- a/src/pages/Home/components/Hero.jsx
+++ b/src/pages/Home/components/Hero.jsx
@@ -27,18 +27,30 @@ export function Hero() {
         className="relative z-10 space-y-8"
       >
         <Motion.div variants={item}>
-          <div className="inline-flex items-center gap-2 px-4 py-2 rounded-full border border-white/10 bg-white/5 text-zinc-300 text-xs font-mono uppercase tracking-widest backdrop-blur-md hover:bg-white/10 transition-colors cursor-default shadow-xl">
-            <ShieldCheck className="w-4 h-4 text-white" />
+          <div
+            className="inline-flex items-center gap-2 px-4 py-2 rounded-full border border-white/10 bg-white/5 text-zinc-300 text-xs font-mono uppercase tracking-widest backdrop-blur-md hover:bg-white/10 transition-colors cursor-default shadow-xl"
+            style={{ color: 'var(--client-side-processing-color, #d4d4d8)' }}
+          >
+            <ShieldCheck className="w-4 h-4" style={{ color: 'inherit' }} />
             Client-Side Processing
           </div>
+          <style>{`
+            .light [style*='--client-side-processing-color'] {
+              --client-side-processing-color: #000 !important;
+            }
+          `}</style>
         </Motion.div>
 
         <Motion.h1 
           variants={item}
-          className="text-6xl md:text-8xl font-extrabold text-white tracking-tighter leading-[1.1]"
+          className="text-6xl md:text-8xl font-extrabold tracking-tighter leading-[1.1] flex flex-col items-center justify-center text-center w-full"
         >
-          PDF tools that <br className="hidden md:block" />
-          respect your <span className="text-transparent bg-clip-text bg-gradient-to-r from-zinc-300 to-zinc-600">privacy.</span>
+          <span className="dark:text-white text-transparent bg-clip-text bg-gradient-to-r from-zinc-300 to-zinc-600">
+            PDF tools that
+          </span>
+          <span className="dark:text-white text-transparent bg-clip-text bg-gradient-to-r from-zinc-300 to-zinc-600">
+            respect your privacy.
+          </span>
         </Motion.h1>
 
         <Motion.p 
diff --git a/src/pages/Home/components/ToolsGrid.jsx b/src/pages/Home/components/ToolsGrid.jsx
index e840e52..66fee62 100644
--- a/src/pages/Home/components/ToolsGrid.jsx
+++ b/src/pages/Home/components/ToolsGrid.jsx
@@ -38,20 +38,20 @@ export function ToolsGrid() {
       >
         <Link
           to="/merge"
-          className="group flex flex-col p-8 bg-[#0a0a0a] border border-white/10 rounded-3xl hover:border-white/30 hover:bg-white/[0.02] hover:shadow-[0_0_40px_rgba(255,255,255,0.03)] transition-all duration-500 text-left h-full relative overflow-hidden"
+          className="group flex flex-col p-8 bg-[var(--color-surface)] border border-[var(--color-border)] rounded-3xl hover:border-[var(--color-border-hover)] hover:bg-[rgba(0,0,0,0.02)] hover:shadow-[0_0_40px_rgba(0,0,0,0.03)] transition-all duration-500 text-left h-full relative overflow-hidden"
         >
-          <div className="absolute inset-0 bg-gradient-to-br from-white/[0.02] to-transparent opacity-0 group-hover:opacity-100 transition-opacity duration-500" />
-          <div className="relative z-10 w-14 h-14 border border-white/10 bg-zinc-900 text-white rounded-2xl flex items-center justify-center mb-8 group-hover:scale-110 group-hover:bg-white group-hover:text-black transition-all duration-500">
+          <div className="absolute inset-0 bg-gradient-to-br from-black/[0.02] to-transparent opacity-0 group-hover:opacity-100 transition-opacity duration-500" />
+          <div className="relative z-10 w-14 h-14 border border-[var(--color-border)] bg-[var(--color-background)] text-[var(--color-primary)] rounded-2xl flex items-center justify-center mb-8 group-hover:scale-110 group-hover:bg-[var(--color-primary)] group-hover:text-[var(--color-primary-foreground)] transition-all duration-500">
             <Layers className="w-6 h-6" />
           </div>
-          <h2 className="relative z-10 text-2xl font-semibold text-white mb-3 tracking-tight">
+          <h2 className="relative z-10 text-2xl font-semibold text-[var(--color-primary)] mb-3 tracking-tight">
             Merge PDF
           </h2>
-          <p className="relative z-10 text-zinc-400 mb-8 font-light flex-grow leading-relaxed">
+          <p className="relative z-10 text-[var(--color-muted)] mb-8 font-light flex-grow leading-relaxed">
             Combine multiple PDFs into a single document in milliseconds. Drag,
             drop, and organize securely.
           </p>
-          <div className="relative z-10 flex items-center text-sm font-medium text-white group-hover:translate-x-2 transition-transform duration-300">
+          <div className="relative z-10 flex items-center text-sm font-medium text-[var(--color-primary)] group-hover:translate-x-2 transition-transform duration-300">
             Open Merge Tool <span className="ml-2">→</span>
           </div>
         </Link>
@@ -67,20 +67,20 @@ export function ToolsGrid() {
       >
         <Link
           to="/split"
-          className="group flex flex-col p-8 bg-[#0a0a0a] border border-white/10 rounded-3xl hover:border-white/30 hover:bg-white/[0.02] hover:shadow-[0_0_40px_rgba(255,255,255,0.03)] transition-all duration-500 text-left h-full relative overflow-hidden"
+          className="group flex flex-col p-8 bg-[var(--color-surface)] border border-[var(--color-border)] rounded-3xl hover:border-[var(--color-border-hover)] hover:bg-[rgba(0,0,0,0.02)] hover:shadow-[0_0_40px_rgba(0,0,0,0.03)] transition-all duration-500 text-left h-full relative overflow-hidden"
         >
-          <div className="absolute inset-0 bg-gradient-to-br from-white/[0.02] to-transparent opacity-0 group-hover:opacity-100 transition-opacity duration-500" />
-          <div className="relative z-10 w-14 h-14 border border-white/10 bg-zinc-900 text-white rounded-2xl flex items-center justify-center mb-8 group-hover:scale-110 group-hover:bg-white group-hover:text-black transition-all duration-500">
+          <div className="absolute inset-0 bg-gradient-to-br from-black/[0.02] to-transparent opacity-0 group-hover:opacity-100 transition-opacity duration-500" />
+          <div className="relative z-10 w-14 h-14 border border-[var(--color-border)] bg-[var(--color-background)] text-[var(--color-primary)] rounded-2xl flex items-center justify-center mb-8 group-hover:scale-110 group-hover:bg-[var(--color-primary)] group-hover:text-[var(--color-primary-foreground)] transition-all duration-500">
             <SplitSquareHorizontal className="w-6 h-6" />
           </div>
-          <h2 className="relative z-10 text-2xl font-semibold text-white mb-3 tracking-tight">
+          <h2 className="relative z-10 text-2xl font-semibold text-[var(--color-primary)] mb-3 tracking-tight">
             Split PDF
           </h2>
-          <p className="relative z-10 text-zinc-400 mb-8 font-light flex-grow leading-relaxed">
+          <p className="relative z-10 text-[var(--color-muted)] mb-8 font-light flex-grow leading-relaxed">
             Extract specific pages or break a massive document down into smaller
             files instantly.
           </p>
-          <div className="relative z-10 flex items-center text-sm font-medium text-white group-hover:translate-x-2 transition-transform duration-300">
+          <div className="relative z-10 flex items-center text-sm font-medium text-[var(--color-primary)] group-hover:translate-x-2 transition-transform duration-300">
             Open Split Tool <span className="ml-2">→</span>
           </div>
         </Link>
@@ -96,20 +96,20 @@ export function ToolsGrid() {
       >
         <Link
           to="/watermark"
-          className="group flex flex-col p-8 bg-[#0a0a0a] border border-white/10 rounded-3xl hover:border-white/30 hover:bg-white/[0.02] hover:shadow-[0_0_40px_rgba(255,255,255,0.03)] transition-all duration-500 text-left h-full relative overflow-hidden"
+          className="group flex flex-col p-8 bg-[var(--color-surface)] border border-[var(--color-border)] rounded-3xl hover:border-[var(--color-border-hover)] hover:bg-[rgba(0,0,0,0.02)] hover:shadow-[0_0_40px_rgba(0,0,0,0.03)] transition-all duration-500 text-left h-full relative overflow-hidden"
         >
-          <div className="absolute inset-0 bg-gradient-to-br from-white/[0.02] to-transparent opacity-0 group-hover:opacity-100 transition-opacity duration-500" />
-          <div className="relative z-10 w-14 h-14 border border-white/10 bg-zinc-900 text-white rounded-2xl flex items-center justify-center mb-8 group-hover:scale-110 group-hover:bg-white group-hover:text-black transition-all duration-500">
+          <div className="absolute inset-0 bg-gradient-to-br from-black/[0.02] to-transparent opacity-0 group-hover:opacity-100 transition-opacity duration-500" />
+          <div className="relative z-10 w-14 h-14 border border-[var(--color-border)] bg-[var(--color-background)] text-[var(--color-primary)] rounded-2xl flex items-center justify-center mb-8 group-hover:scale-110 group-hover:bg-[var(--color-primary)] group-hover:text-[var(--color-primary-foreground)] transition-all duration-500">
             <Stamp className="w-6 h-6" />
           </div>
-          <h2 className="relative z-10 text-2xl font-semibold text-white mb-3 tracking-tight">
+          <h2 className="relative z-10 text-2xl font-semibold text-[var(--color-primary)] mb-3 tracking-tight">
             Add Watermark
           </h2>
-          <p className="relative z-10 text-zinc-400 mb-8 font-light flex-grow leading-relaxed">
+          <p className="relative z-10 text-[var(--color-muted)] mb-8 font-light flex-grow leading-relaxed">
             Stamp custom text diagonally across your documents. Perfect for
             sensitive drafts and contracts.
           </p>
-          <div className="relative z-10 flex items-center text-sm font-medium text-white group-hover:translate-x-2 transition-transform duration-300">
+          <div className="relative z-10 flex items-center text-sm font-medium text-[var(--color-primary)] group-hover:translate-x-2 transition-transform duration-300">
             Open Watermark Tool <span className="ml-2">→</span>
           </div>
         </Link>
@@ -125,20 +125,20 @@ export function ToolsGrid() {
       >
         <Link
           to="/image-to-pdf"
-          className="group flex flex-col p-8 bg-[#0a0a0a] border border-white/10 rounded-3xl hover:border-white/30 hover:bg-white/[0.02] hover:shadow-[0_0_40px_rgba(255,255,255,0.03)] transition-all duration-500 text-left h-full relative overflow-hidden"
+          className="group flex flex-col p-8 bg-[var(--color-surface)] border border-[var(--color-border)] rounded-3xl hover:border-[var(--color-border-hover)] hover:bg-[rgba(0,0,0,0.02)] hover:shadow-[0_0_40px_rgba(0,0,0,0.03)] transition-all duration-500 text-left h-full relative overflow-hidden"
         >
-          <div className="absolute inset-0 bg-gradient-to-br from-white/[0.02] to-transparent opacity-0 group-hover:opacity-100 transition-opacity duration-500" />
-          <div className="relative z-10 w-14 h-14 border border-white/10 bg-zinc-900 text-white rounded-2xl flex items-center justify-center mb-8 group-hover:scale-110 group-hover:bg-white group-hover:text-black transition-all duration-500">
+          <div className="absolute inset-0 bg-gradient-to-br from-black/[0.02] to-transparent opacity-0 group-hover:opacity-100 transition-opacity duration-500" />
+          <div className="relative z-10 w-14 h-14 border border-[var(--color-border)] bg-[var(--color-background)] text-[var(--color-primary)] rounded-2xl flex items-center justify-center mb-8 group-hover:scale-110 group-hover:bg-[var(--color-primary)] group-hover:text-[var(--color-primary-foreground)] transition-all duration-500">
             <ImageIcon className="w-6 h-6" />
           </div>
-          <h2 className="relative z-10 text-2xl font-semibold text-white mb-3 tracking-tight">
+          <h2 className="relative z-10 text-2xl font-semibold text-[var(--color-primary)] mb-3 tracking-tight">
             Image to PDF
           </h2>
-          <p className="relative z-10 text-zinc-400 mb-8 font-light flex-grow leading-relaxed">
+          <p className="relative z-10 text-[var(--color-muted)] mb-8 font-light flex-grow leading-relaxed">
             Convert JPG and PNG images into a high-quality PDF document. Drag to
             reorder your pages.
           </p>
-          <div className="relative z-10 flex items-center text-sm font-medium text-white group-hover:translate-x-2 transition-transform duration-300">
+          <div className="relative z-10 flex items-center text-sm font-medium text-[var(--color-primary)] group-hover:translate-x-2 transition-transform duration-300">
             Open Image to PDF <span className="ml-2">→</span>
           </div>
         </Link>
@@ -154,19 +154,19 @@ export function ToolsGrid() {
       >
         <Link
           to="/compress"
-          className="group flex flex-col p-8 bg-[#0a0a0a] border border-white/10 rounded-3xl hover:border-white/30 hover:bg-white/[0.02] hover:shadow-[0_0_40px_rgba(255,255,255,0.03)] transition-all duration-500 text-left h-full relative overflow-hidden"
+          className="group flex flex-col p-8 bg-[var(--color-surface)] border border-[var(--color-border)] rounded-3xl hover:border-[var(--color-border-hover)] hover:bg-[rgba(0,0,0,0.02)] hover:shadow-[0_0_40px_rgba(0,0,0,0.03)] transition-all duration-500 text-left h-full relative overflow-hidden"
         >
-          <div className="absolute inset-0 bg-gradient-to-br from-white/[0.02] to-transparent opacity-0 group-hover:opacity-100 transition-opacity duration-500" />
-          <div className="relative z-10 w-14 h-14 border border-white/10 bg-zinc-900 text-white rounded-2xl flex items-center justify-center mb-8 group-hover:scale-110 group-hover:bg-white group-hover:text-black transition-all duration-500">
+          <div className="absolute inset-0 bg-gradient-to-br from-black/[0.02] to-transparent opacity-0 group-hover:opacity-100 transition-opacity duration-500" />
+          <div className="relative z-10 w-14 h-14 border border-[var(--color-border)] bg-[var(--color-background)] text-[var(--color-primary)] rounded-2xl flex items-center justify-center mb-8 group-hover:scale-110 group-hover:bg-[var(--color-primary)] group-hover:text-[var(--color-primary-foreground)] transition-all duration-500">
             <Minimize2 className="w-6 h-6" />
           </div>
-          <h2 className="relative z-10 text-2xl font-semibold text-white mb-3 tracking-tight">
+          <h2 className="relative z-10 text-2xl font-semibold text-[var(--color-primary)] mb-3 tracking-tight">
             Compress PDF
           </h2>
-          <p className="relative z-10 text-zinc-400 mb-8 font-light flex-grow leading-relaxed">
+          <p className="relative z-10 text-[var(--color-muted)] mb-8 font-light flex-grow leading-relaxed">
             Reduce file size while maintaining visual quality.
           </p>
-          <div className="relative z-10 flex items-center text-sm font-medium text-white group-hover:translate-x-2 transition-transform duration-300">
+          <div className="relative z-10 flex items-center text-sm font-medium text-[var(--color-primary)] group-hover:translate-x-2 transition-transform duration-300">
             Open Compress PDF <span className="ml-2">→</span>
           </div>
         </Link>
@@ -182,19 +182,19 @@ export function ToolsGrid() {
       >
         <Link
           to="/rotate"
-          className="group flex flex-col p-8 bg-[#0a0a0a] border border-white/10 rounded-3xl hover:border-white/30 hover:bg-white/[0.02] hover:shadow-[0_0_40px_rgba(255,255,255,0.03)] transition-all duration-500 text-left h-full relative overflow-hidden"
+          className="group flex flex-col p-8 bg-[var(--color-surface)] border border-[var(--color-border)] rounded-3xl hover:border-[var(--color-border-hover)] hover:bg-[rgba(0,0,0,0.02)] hover:shadow-[0_0_40px_rgba(0,0,0,0.03)] transition-all duration-500 text-left h-full relative overflow-hidden"
         >
-          <div className="absolute inset-0 bg-gradient-to-br from-white/[0.02] to-transparent opacity-0 group-hover:opacity-100 transition-opacity duration-500" />
-          <div className="relative z-10 w-14 h-14 border border-white/10 bg-zinc-900 text-white rounded-2xl flex items-center justify-center mb-8 group-hover:scale-110 group-hover:bg-white group-hover:text-black transition-all duration-500">
+          <div className="absolute inset-0 bg-gradient-to-br from-black/[0.02] to-transparent opacity-0 group-hover:opacity-100 transition-opacity duration-500" />
+          <div className="relative z-10 w-14 h-14 border border-[var(--color-border)] bg-[var(--color-background)] text-[var(--color-primary)] rounded-2xl flex items-center justify-center mb-8 group-hover:scale-110 group-hover:bg-[var(--color-primary)] group-hover:text-[var(--color-primary-foreground)] transition-all duration-500">
             <RefreshCw className="w-10 h-10" />
           </div>
-          <h2 className="relative z-10 text-2xl font-semibold text-white mb-3 tracking-tight">
+          <h2 className="relative z-10 text-2xl font-semibold text-[var(--color-primary)] mb-3 tracking-tight">
             Rotate PDF
           </h2>
-          <p className="relative z-10 text-zinc-400 mb-8 font-light flex-grow leading-relaxed">
+          <p className="relative z-10 text-[var(--color-muted)] mb-8 font-light flex-grow leading-relaxed">
             Rotate pages in your PDF document.
           </p>
-          <div className="relative z-10 flex items-center text-sm font-medium text-white group-hover:translate-x-2 transition-transform duration-300">
+          <div className="relative z-10 flex items-center text-sm font-medium text-[var(--color-primary)] group-hover:translate-x-2 transition-transform duration-300">
             Open Rotate PDF <span className="ml-2">→</span>
           </div>
         </Link>
@@ -210,19 +210,19 @@ export function ToolsGrid() {
       >
         <Link
           to="/organize"
-          className="group flex flex-col p-8 bg-[#0a0a0a] border border-white/10 rounded-3xl hover:border-white/30 hover:bg-white/[0.02] hover:shadow-[0_0_40px_rgba(255,255,255,0.03)] transition-all duration-500 text-left h-full relative overflow-hidden"
+          className="group flex flex-col p-8 bg-[var(--color-surface)] border border-[var(--color-border)] rounded-3xl hover:border-[var(--color-border-hover)] hover:bg-[rgba(0,0,0,0.02)] hover:shadow-[0_0_40px_rgba(0,0,0,0.03)] transition-all duration-500 text-left h-full relative overflow-hidden"
         >
-          <div className="absolute inset-0 bg-gradient-to-br from-white/[0.02] to-transparent opacity-0 group-hover:opacity-100 transition-opacity duration-500" />
-          <div className="relative z-10 w-14 h-14 border border-white/10 bg-zinc-900 text-white rounded-2xl flex items-center justify-center mb-8 group-hover:scale-110 group-hover:bg-white group-hover:text-black transition-all duration-500">
+          <div className="absolute inset-0 bg-gradient-to-br from-black/[0.02] to-transparent opacity-0 group-hover:opacity-100 transition-opacity duration-500" />
+          <div className="relative z-10 w-14 h-14 border border-[var(--color-border)] bg-[var(--color-background)] text-[var(--color-primary)] rounded-2xl flex items-center justify-center mb-8 group-hover:scale-110 group-hover:bg-[var(--color-primary)] group-hover:text-[var(--color-primary-foreground)] transition-all duration-500">
             <LayoutGrid className="w-10 h-10" />
           </div>
-          <h2 className="relative z-10 text-2xl font-semibold text-white mb-3 tracking-tight">
+          <h2 className="relative z-10 text-2xl font-semibold text-[var(--color-primary)] mb-3 tracking-tight">
             Organize PDF
           </h2>
-          <p className="relative z-10 text-zinc-400 mb-8 font-light flex-grow leading-relaxed">
+          <p className="relative z-10 text-[var(--color-muted)] mb-8 font-light flex-grow leading-relaxed">
             Organize pages in your PDF document.
           </p>
-          <div className="relative z-10 flex items-center text-sm font-medium text-white group-hover:translate-x-2 transition-transform duration-300">
+          <div className="relative z-10 flex items-center text-sm font-medium text-[var(--color-primary)] group-hover:translate-x-2 transition-transform duration-300">
             Open Organize PDF <span className="ml-2">→</span>
           </div>
         </Link>
@@ -238,19 +238,19 @@ export function ToolsGrid() {
       >
         <Link
           to="/pdf-to-image"
-          className="group flex flex-col p-8 bg-[#0a0a0a] border border-white/10 rounded-3xl hover:border-white/30 hover:bg-white/[0.02] hover:shadow-[0_0_40px_rgba(255,255,255,0.03)] transition-all duration-500 text-left h-full relative overflow-hidden"
+          className="group flex flex-col p-8 bg-[var(--color-surface)] border border-[var(--color-border)] rounded-3xl hover:border-[var(--color-border-hover)] hover:bg-[rgba(0,0,0,0.02)] hover:shadow-[0_0_40px_rgba(0,0,0,0.03)] transition-all duration-500 text-left h-full relative overflow-hidden"
         >
-          <div className="absolute inset-0 bg-gradient-to-br from-white/[0.02] to-transparent opacity-0 group-hover:opacity-100 transition-opacity duration-500" />
-          <div className="relative z-10 w-14 h-14 border border-white/10 bg-zinc-900 text-white rounded-2xl flex items-center justify-center mb-8 group-hover:scale-110 group-hover:bg-white group-hover:text-black transition-all duration-500">
-            <Images className="w-6 h-6" />,
+          <div className="absolute inset-0 bg-gradient-to-br from-black/[0.02] to-transparent opacity-0 group-hover:opacity-100 transition-opacity duration-500" />
+          <div className="relative z-10 w-14 h-14 border border-[var(--color-border)] bg-[var(--color-background)] text-[var(--color-primary)] rounded-2xl flex items-center justify-center mb-8 group-hover:scale-110 group-hover:bg-[var(--color-primary)] group-hover:text-[var(--color-primary-foreground)] transition-all duration-500">
+            <Images className="w-6 h-6" />
           </div>
-          <h2 className="relative z-10 text-2xl font-semibold text-white mb-3 tracking-tight">
+          <h2 className="relative z-10 text-2xl font-semibold text-[var(--color-primary)] mb-3 tracking-tight">
             PDF to Images
           </h2>
-          <p className="relative z-10 text-zinc-400 mb-8 font-light flex-grow leading-relaxed">
+          <p className="relative z-10 text-[var(--color-muted)] mb-8 font-light flex-grow leading-relaxed">
             Extract images from your PDF document.
           </p>
-          <div className="relative z-10 flex items-center text-sm font-medium text-white group-hover:translate-x-2 transition-transform duration-300">
+          <div className="relative z-10 flex items-center text-sm font-medium text-[var(--color-primary)] group-hover:translate-x-2 transition-transform duration-300">
             Open PDF to Images <span className="ml-2">→</span>
           </div>
         </Link>
@@ -266,19 +266,19 @@ export function ToolsGrid() {
       >
         <Link
           to="/grayscale"
-          className="group flex flex-col p-8 bg-[#0a0a0a] border border-white/10 rounded-3xl hover:border-white/30 hover:bg-white/[0.02] hover:shadow-[0_0_40px_rgba(255,255,255,0.03)] transition-all duration-500 text-left h-full relative overflow-hidden"
+          className="group flex flex-col p-8 bg-[var(--color-surface)] border border-[var(--color-border)] rounded-3xl hover:border-[var(--color-border-hover)] hover:bg-[rgba(0,0,0,0.02)] hover:shadow-[0_0_40px_rgba(0,0,0,0.03)] transition-all duration-500 text-left h-full relative overflow-hidden"
         >
-          <div className="absolute inset-0 bg-gradient-to-br from-white/[0.02] to-transparent opacity-0 group-hover:opacity-100 transition-opacity duration-500" />
-          <div className="relative z-10 w-14 h-14 border border-white/10 bg-zinc-900 text-white rounded-2xl flex items-center justify-center mb-8 group-hover:scale-110 group-hover:bg-white group-hover:text-black transition-all duration-500">
+          <div className="absolute inset-0 bg-gradient-to-br from-black/[0.02] to-transparent opacity-0 group-hover:opacity-100 transition-opacity duration-500" />
+          <div className="relative z-10 w-14 h-14 border border-[var(--color-border)] bg-[var(--color-background)] text-[var(--color-primary)] rounded-2xl flex items-center justify-center mb-8 group-hover:scale-110 group-hover:bg-[var(--color-primary)] group-hover:text-[var(--color-primary-foreground)] transition-all duration-500">
             <Contrast className="w-6 h-6" />
           </div>
-          <h2 className="relative z-10 text-2xl font-semibold text-white mb-3 tracking-tight">
+          <h2 className="relative z-10 text-2xl font-semibold text-[var(--color-primary)] mb-3 tracking-tight">
             Grayscale PDF
           </h2>
-          <p className="relative z-10 text-zinc-400 mb-8 font-light flex-grow leading-relaxed">
+          <p className="relative z-10 text-[var(--color-muted)] mb-8 font-light flex-grow leading-relaxed">
             Convert your PDF to grayscale.
           </p>
-          <div className="relative z-10 flex items-center text-sm font-medium text-white group-hover:translate-x-2 transition-transform duration-300">
+          <div className="relative z-10 flex items-center text-sm font-medium text-[var(--color-primary)] group-hover:translate-x-2 transition-transform duration-300">
             Open Grayscale PDF <span className="ml-2">→</span>
           </div>
         </Link>
@@ -294,19 +294,19 @@ export function ToolsGrid() {
       >
         <Link
           to="/page-numbers"
-          className="group flex flex-col p-8 bg-[#0a0a0a] border border-white/10 rounded-3xl hover:border-white/30 hover:bg-white/[0.02] hover:shadow-[0_0_40px_rgba(255,255,255,0.03)] transition-all duration-500 text-left h-full relative overflow-hidden"
+          className="group flex flex-col p-8 bg-[var(--color-surface)] border border-[var(--color-border)] rounded-3xl hover:border-[var(--color-border-hover)] hover:bg-[rgba(0,0,0,0.02)] hover:shadow-[0_0_40px_rgba(0,0,0,0.03)] transition-all duration-500 text-left h-full relative overflow-hidden"
         >
-          <div className="absolute inset-0 bg-gradient-to-br from-white/[0.02] to-transparent opacity-0 group-hover:opacity-100 transition-opacity duration-500" />
-          <div className="relative z-10 w-14 h-14 border border-white/10 bg-zinc-900 text-white rounded-2xl flex items-center justify-center mb-8 group-hover:scale-110 group-hover:bg-white group-hover:text-black transition-all duration-500">
+          <div className="absolute inset-0 bg-gradient-to-br from-black/[0.02] to-transparent opacity-0 group-hover:opacity-100 transition-opacity duration-500" />
+          <div className="relative z-10 w-14 h-14 border border-[var(--color-border)] bg-[var(--color-background)] text-[var(--color-primary)] rounded-2xl flex items-center justify-center mb-8 group-hover:scale-110 group-hover:bg-[var(--color-primary)] group-hover:text-[var(--color-primary-foreground)] transition-all duration-500">
             <Hash className="w-6 h-6" />
           </div>
-          <h2 className="relative z-10 text-2xl font-semibold text-white mb-3 tracking-tight">
+          <h2 className="relative z-10 text-2xl font-semibold text-[var(--color-primary)] mb-3 tracking-tight">
             Page Numbers
           </h2>
-          <p className="relative z-10 text-zinc-400 mb-8 font-light flex-grow leading-relaxed">
+          <p className="relative z-10 text-[var(--color-muted)] mb-8 font-light flex-grow leading-relaxed">
             Auto-stamp sequential numbers on every page footer. Choose position, prefix, and start number.
           </p>
-          <div className="relative z-10 flex items-center text-sm font-medium text-white group-hover:translate-x-2 transition-transform duration-300">
+          <div className="relative z-10 flex items-center text-sm font-medium text-[var(--color-primary)] group-hover:translate-x-2 transition-transform duration-300">
             Open Page Numbers <span className="ml-2">→</span>
           </div>
         </Link>
@@ -322,19 +322,19 @@ export function ToolsGrid() {
       >
         <Link
           to="/lock-pdf"
-          className="group flex flex-col p-8 bg-[#0a0a0a] border border-white/10 rounded-3xl hover:border-white/30 hover:bg-white/[0.02] hover:shadow-[0_0_40px_rgba(255,255,255,0.03)] transition-all duration-500 text-left h-full relative overflow-hidden"
+          className="group flex flex-col p-8 bg-[var(--color-surface)] border border-[var(--color-border)] rounded-3xl hover:border-[var(--color-border-hover)] hover:bg-[rgba(0,0,0,0.02)] hover:shadow-[0_0_40px_rgba(0,0,0,0.03)] transition-all duration-500 text-left h-full relative overflow-hidden"
         >
-          <div className="absolute inset-0 bg-gradient-to-br from-white/[0.02] to-transparent opacity-0 group-hover:opacity-100 transition-opacity duration-500" />
-          <div className="relative z-10 w-14 h-14 border border-white/10 bg-zinc-900 text-white rounded-2xl flex items-center justify-center mb-8 group-hover:scale-110 group-hover:bg-white group-hover:text-black transition-all duration-500">
+          <div className="absolute inset-0 bg-gradient-to-br from-black/[0.02] to-transparent opacity-0 group-hover:opacity-100 transition-opacity duration-500" />
+          <div className="relative z-10 w-14 h-14 border border-[var(--color-border)] bg-[var(--color-background)] text-[var(--color-primary)] rounded-2xl flex items-center justify-center mb-8 group-hover:scale-110 group-hover:bg-[var(--color-primary)] group-hover:text-[var(--color-primary-foreground)] transition-all duration-500">
             <Lock className="w-6 h-6" />
           </div>
-          <h2 className="relative z-10 text-2xl font-semibold text-white mb-3 tracking-tight">
+          <h2 className="relative z-10 text-2xl font-semibold text-[var(--color-primary)] mb-3 tracking-tight">
             Lock PDF
           </h2>
-          <p className="relative z-10 text-zinc-400 mb-8 font-light flex-grow leading-relaxed">
+          <p className="relative z-10 text-[var(--color-muted)] mb-8 font-light flex-grow leading-relaxed">
             Password-protect your PDF with RC4 encryption. Processed entirely in your browser — nothing is uploaded.
           </p>
-          <div className="relative z-10 flex items-center text-sm font-medium text-white group-hover:translate-x-2 transition-transform duration-300">
+          <div className="relative z-10 flex items-center text-sm font-medium text-[var(--color-primary)] group-hover:translate-x-2 transition-transform duration-300">
             Open Lock PDF <span className="ml-2">→</span>
           </div>
         </Link>
@@ -350,19 +350,19 @@ export function ToolsGrid() {
       >
         <Link
           to="/edit-pdf"
-          className="group flex flex-col p-8 bg-[#0a0a0a] border border-white/10 rounded-3xl hover:border-white/30 hover:bg-white/[0.02] hover:shadow-[0_0_40px_rgba(255,255,255,0.03)] transition-all duration-500 text-left h-full relative overflow-hidden"
+          className="group flex flex-col p-8 bg-[var(--color-surface)] border border-[var(--color-border)] rounded-3xl hover:border-[var(--color-border-hover)] hover:bg-[rgba(0,0,0,0.02)] hover:shadow-[0_0_40px_rgba(0,0,0,0.03)] transition-all duration-500 text-left h-full relative overflow-hidden"
         >
-          <div className="absolute inset-0 bg-gradient-to-br from-white/[0.02] to-transparent opacity-0 group-hover:opacity-100 transition-opacity duration-500" />
-          <div className="relative z-10 w-14 h-14 border border-white/10 bg-zinc-900 text-white rounded-2xl flex items-center justify-center mb-8 group-hover:scale-110 group-hover:bg-white group-hover:text-black transition-all duration-500">
+          <div className="absolute inset-0 bg-gradient-to-br from-black/[0.02] to-transparent opacity-0 group-hover:opacity-100 transition-opacity duration-500" />
+          <div className="relative z-10 w-14 h-14 border border-[var(--color-border)] bg-[var(--color-background)] text-[var(--color-primary)] rounded-2xl flex items-center justify-center mb-8 group-hover:scale-110 group-hover:bg-[var(--color-primary)] group-hover:text-[var(--color-primary-foreground)] transition-all duration-500">
             <FileEdit className="w-6 h-6" />
           </div>
-          <h2 className="relative z-10 text-2xl font-semibold text-white mb-3 tracking-tight">
+          <h2 className="relative z-10 text-2xl font-semibold text-[var(--color-primary)] mb-3 tracking-tight">
             Edit PDF
           </h2>
-          <p className="relative z-10 text-zinc-400 mb-8 font-light flex-grow leading-relaxed">
+          <p className="relative z-10 text-[var(--color-muted)] mb-8 font-light flex-grow leading-relaxed">
             Draw, highlight, add text, and annotate your PDF pages directly in the browser.
           </p>
-          <div className="relative z-10 flex items-center text-sm font-medium text-white group-hover:translate-x-2 transition-transform duration-300">
+          <div className="relative z-10 flex items-center text-sm font-medium text-[var(--color-primary)] group-hover:translate-x-2 transition-transform duration-300">
             Open PDF Editor <span className="ml-2">→</span>
           </div>
         </Link>
diff --git a/src/pages/ImageToPdf/ImageToPdf.jsx b/src/pages/ImageToPdf/ImageToPdf.jsx
index 2118887..816b58c 100644
--- a/src/pages/ImageToPdf/ImageToPdf.jsx
+++ b/src/pages/ImageToPdf/ImageToPdf.jsx
@@ -170,7 +170,7 @@ export function ImageToPdf() {
         >
           <ImageIcon className="w-10 h-10" />
         </Motion.div>
-        <h1 className="text-5xl font-black text-white mb-4 tracking-tighter uppercase">Image to PDF</h1>
+           <h1 className="text-5xl font-black text-[var(--color-primary)] mb-4 tracking-tighter uppercase">Image to PDF</h1>
         <p className="text-zinc-500 text-lg font-light max-w-md mx-auto">
           Convert JPG &amp; PNG images into a PDF. Drag thumbnails to set the page order.
         </p>
diff --git a/src/pages/LockPdf/LockPdf.jsx b/src/pages/LockPdf/LockPdf.jsx
index 60e116f..ecd6493 100644
--- a/src/pages/LockPdf/LockPdf.jsx
+++ b/src/pages/LockPdf/LockPdf.jsx
@@ -98,7 +98,7 @@ export function LockPdf() {
           <Lock className="w-10 h-10" />
         </Motion.div>
 
-        <h1 className="text-5xl font-black text-white mb-4 tracking-tighter uppercase">
+        <h1 className="text-5xl font-black text-[var(--color-primary)] mb-4 tracking-tighter uppercase">
           Lock PDF
         </h1>
         <p className="text-zinc-500 text-lg font-light max-w-md mx-auto">
diff --git a/src/pages/Merge/Merge.jsx b/src/pages/Merge/Merge.jsx
index 63cdd35..733b33e 100644
--- a/src/pages/Merge/Merge.jsx
+++ b/src/pages/Merge/Merge.jsx
@@ -322,7 +322,7 @@ export function Merge() {
         >
           <Layers className="w-10 h-10" />
         </Motion.div>
-        <h1 className="text-5xl font-black text-white mb-4 tracking-tighter uppercase">Merge PDF</h1>
+        <h1 className="text-5xl font-black text-[var(--color-primary)] mb-4 tracking-tighter uppercase">Merge PDF</h1>
         <p className="text-zinc-500 text-lg font-light max-w-md mx-auto">
           Combine multiple PDFs into a single file. Drag thumbnails to set the order.
           {!isPremium && (
diff --git a/src/pages/Organize/Organize.jsx b/src/pages/Organize/Organize.jsx
index af3bf0f..9a1e23b 100644
--- a/src/pages/Organize/Organize.jsx
+++ b/src/pages/Organize/Organize.jsx
@@ -109,7 +109,7 @@ export function Organize() {
     <div className="max-w-5xl mx-auto py-12 px-4 sm:px-6">
       <div className="text-center mb-10">
         <div className="inline-flex items-center justify-center w-16 h-16 rounded-2xl bg-zinc-900 border border-white/10 text-white mb-4"><LayoutGrid className="w-8 h-8" /></div>
-        <h1 className="text-4xl font-extrabold text-white mb-4">Organize PDF</h1>
+        <h1 className="text-4xl font-extrabold text-[var(--color-primary)] mb-4">Organize PDF</h1>
         <p className="text-lg text-zinc-400 max-w-xl mx-auto">
           Drag to reorder pages, hover a thumbnail to delete it, then download your reorganized document.
           {!isPremium && <span className="block text-sm text-zinc-600 mt-1">Free tier: files up to {FREE_LIMITS.organize.maxFileSizeMb} MB</span>}
diff --git a/src/pages/PDFtoImage/PDFtoImage.jsx b/src/pages/PDFtoImage/PDFtoImage.jsx
index 4c7ded0..b6b5136 100644
--- a/src/pages/PDFtoImage/PDFtoImage.jsx
+++ b/src/pages/PDFtoImage/PDFtoImage.jsx
@@ -57,7 +57,7 @@ export function PdfToImage() {
     <div className="max-w-3xl mx-auto py-12 px-4 sm:px-6">
       <div className="text-center mb-10">
         <div className="inline-flex items-center justify-center w-16 h-16 rounded-2xl bg-zinc-900 border border-white/10 text-white mb-4"><Images className="w-8 h-8" /></div>
-        <h1 className="text-4xl font-extrabold text-white mb-4">PDF to Images</h1>
+        <h1 className="text-4xl font-extrabold text-[var(--color-primary)] mb-4">PDF to Images</h1>
         <p className="text-lg text-zinc-400">
           Extract every page of your PDF into high-resolution JPEGs. Downloaded instantly as a ZIP file.
           {!isPremium && <span className="block text-sm text-zinc-600 mt-1">Free tier: files up to {FREE_LIMITS.pdfToImage.maxFileSizeMb} MB</span>}
diff --git a/src/pages/PageNumbers/PageNumbers.jsx b/src/pages/PageNumbers/PageNumbers.jsx
index f5a900a..3f94a78 100644
--- a/src/pages/PageNumbers/PageNumbers.jsx
+++ b/src/pages/PageNumbers/PageNumbers.jsx
@@ -72,7 +72,7 @@ export function PageNumbers() {
         >
           <Hash className="w-10 h-10" />
         </Motion.div>
-        <h1 className="text-5xl font-black text-white mb-4 tracking-tighter uppercase">Page Numbers</h1>
+        <h1 className="text-5xl font-black text-[var(--color-primary)] mb-4 tracking-tighter uppercase">Page Numbers</h1>
         <p className="text-zinc-500 text-lg font-light max-w-md mx-auto">
           Auto-stamp sequential numbers on every page footer. Processed entirely in your browser.
         </p>
diff --git a/src/pages/Rotate/Rotate.jsx b/src/pages/Rotate/Rotate.jsx
index 9a42f0f..04760dc 100644
--- a/src/pages/Rotate/Rotate.jsx
+++ b/src/pages/Rotate/Rotate.jsx
@@ -211,7 +211,7 @@ export function Rotate() {
         >
           <RefreshCw className="w-10 h-10" />
         </Motion.div>
-        <h1 className="text-5xl font-black text-white mb-4 tracking-tighter uppercase">Rotate PDF</h1>
+        <h1 className="text-5xl font-black text-[var(--color-primary)] mb-4 tracking-tighter uppercase">Rotate PDF</h1>
         <p className="text-zinc-500 text-lg font-light max-w-md mx-auto">
           Rotate individual pages or the whole document. Processed entirely in your browser.
         </p>
diff --git a/src/pages/Split/Split.jsx b/src/pages/Split/Split.jsx
index e617dde..08e1c3e 100644
--- a/src/pages/Split/Split.jsx
+++ b/src/pages/Split/Split.jsx
@@ -79,7 +79,7 @@ export function Split() {
         <div className="inline-flex items-center justify-center w-16 h-16 rounded-2xl bg-zinc-900 border border-white/10 text-white mb-4">
           <SplitSquareHorizontal className="w-8 h-8" />
         </div>
-        <h1 className="text-4xl font-extrabold text-white mb-4">Split PDF</h1>
+        <h1 className="text-4xl font-extrabold text-[var(--color-primary)] mb-4">Split PDF</h1>
         <p className="text-lg text-zinc-400">
           Extract a specific range of pages from your PDF securely in your browser.
           {!isPremium && (
diff --git a/src/pages/Watermark/Watermark.jsx b/src/pages/Watermark/Watermark.jsx
index cad75c6..9ff9f69 100644
--- a/src/pages/Watermark/Watermark.jsx
+++ b/src/pages/Watermark/Watermark.jsx
@@ -81,9 +81,9 @@ export function Watermark() {
           <Stamp className="w-8 h-8" />
         </div>
 
-        <h1 className="text-4xl font-extrabold text-white mb-4">
-          Add Watermark
-        </h1>
+          <h1 className="text-4xl font-extrabold text-[var(--color-primary)] mb-4">
+            Add Watermark
+          </h1>
 
         <p className="text-lg text-zinc-400">
           Stamp text across your document securely in your browser.
diff --git a/tailwind.config.js b/tailwind.config.js
new file mode 100644
index 0000000..e5eee06
--- /dev/null
+++ b/tailwind.config.js
@@ -0,0 +1,13 @@
+/* global module */
+/** @type {import('tailwindcss').Config} */
+module.exports = {
+  darkMode: 'class',
+  content: [
+    "./index.html",
+    "./src/**/*.{js,jsx,ts,tsx}",
+  ],
+  theme: {
+    extend: {},
+  },
+  plugins: [],
+};