diff --git a/package-lock.json b/package-lock.json
index d7cbf93..43a3384 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -72,7 +72,6 @@
       "integrity": "sha512-CGOfOJqWjg2qW/Mb6zNsDm+u5vFQ8DxXfbM09z69p5Z6+mE1ikP2jUXw+j42Pf1XTYED2Rni5f95npYeuwMDQA==",
       "dev": true,
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "@babel/code-frame": "^7.29.0",
         "@babel/generator": "^7.29.0",
@@ -1378,7 +1377,6 @@
       "integrity": "sha512-ilcTH/UniCkMdtexkoCN0bI7pMcJDvmQFPvuPvmEaYA/NSfFTAgdUSLAoVjaRJm7+6PvcM+q1zYOwS4wTYMF9w==",
       "dev": true,
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "csstype": "^3.2.2"
       }
@@ -1420,7 +1418,6 @@
       "integrity": "sha512-UVJyE9MttOsBQIDKw1skb9nAwQuR5wuGD3+82K6JgJlm/Y+KI92oNsMNGZCYdDsVtRHSak0pcV5Dno5+4jh9sw==",
       "dev": true,
       "license": "MIT",
-      "peer": true,
       "bin": {
         "acorn": "bin/acorn"
       },
@@ -1643,7 +1640,6 @@
         }
       ],
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "baseline-browser-mapping": "^2.10.12",
         "caniuse-lite": "^1.0.30001782",
@@ -1966,7 +1962,6 @@
       "integrity": "sha512-MobhYKIoAO1s1e4VUrgx1l1Sk2JBR/Gqjjgw8+mfgoLE2xwsHur4gdfTxyTgShrhvdVFTaJSgMiQBl1jv/AWxg==",
       "dev": true,
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "@eslint-community/eslint-utils": "^4.2.0",
         "@eslint-community/regexpp": "^4.11.0",
@@ -2530,7 +2525,6 @@
       "integrity": "sha512-/imKNG4EbWNrVjoNC/1H5/9GFy+tqjGBHCaSsN+P2RnPqjsLmv6UD3Ej+Kj8nBWaRAwyk7kK5ZUc+OEatnTR3A==",
       "dev": true,
       "license": "MIT",
-      "peer": true,
       "bin": {
         "jiti": "bin/jiti.js"
       }
@@ -2923,7 +2917,6 @@
       "integrity": "sha512-QP88BAKvMam/3NxH6vj2o21R6MjxZUAd6nlwAS/pnGvN9IVLocLHxGYIzFhg6fUQ+5th6P4dv4eW9jX3DSIj7A==",
       "dev": true,
       "license": "MIT",
-      "peer": true,
       "engines": {
         "node": ">=12"
       },
@@ -2971,7 +2964,6 @@
         }
       ],
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "nanoid": "^3.3.11",
         "picocolors": "^1.1.1",
@@ -3161,7 +3153,6 @@
       "resolved": "https://registry.npmjs.org/react/-/react-19.2.5.tgz",
       "integrity": "sha512-llUJLzz1zTUBrskt2pwZgLq59AemifIftw4aB7JxOqf1HY2FDaGDxgwpAPVzHU1kdWabH7FauP4i1oEeer2WCA==",
       "license": "MIT",
-      "peer": true,
       "engines": {
         "node": ">=0.10.0"
       }
@@ -3642,7 +3633,6 @@
       "integrity": "sha512-o5a9xKjbtuhY6Bi5S3+HvbRERmouabWbyUcpXXUA1u+GNUKoROi9byOJ8M0nHbHYHkYICiMlqxkg1KkYmm25Sw==",
       "dev": true,
       "license": "MIT",
-      "peer": true,
       "dependencies": {
         "esbuild": "^0.21.3",
         "postcss": "^8.4.43",
diff --git a/src/App.jsx b/src/App.jsx
index b98bf6c..730d0ec 100644
--- a/src/App.jsx
+++ b/src/App.jsx
@@ -1,7 +1,9 @@
-import React, { useState, useMemo } from 'react';
+import React, { useState, useMemo, useEffect } from 'react';
+import { Menu, Layers } from 'lucide-react';
 import Sidebar from './components/Sidebar';
 import EndpointViewer from './components/EndpointViewer';
 import Introduction from './components/Introduction';
+import ThemeToggle from './components/ThemeToggle';
 import { graphqlTopics, GRAPHQL_BASE_URL } from './data/apiData';
 import { restTopics, REST_BASE_URL } from './data/restTopics';
 
@@ -27,31 +29,79 @@ function filterTopics(topics, q) {
 function App() {
   const [activeTopic, setActiveTopic] = useState(null);
   const [searchQuery, setSearchQuery] = useState('');
+  const [sidebarOpen, setSidebarOpen] = useState(false);
+  const [dark, setDark] = useState(() => {
+    if (typeof window === 'undefined') return false;
+    const saved = localStorage.getItem('theme');
+    if (saved) return saved === 'dark';
+    return window.matchMedia('(prefers-color-scheme: dark)').matches;
+  });
+
+  useEffect(() => {
+    const root = document.documentElement;
+    root.classList.toggle('dark', dark);
+    localStorage.setItem('theme', dark ? 'dark' : 'light');
+  }, [dark]);
 
   const q = searchQuery.trim().toLowerCase();
   const visibleGraphql = useMemo(() => filterTopics(allGraphql, q), [q]);
   const visibleRest    = useMemo(() => filterTopics(allRest,    q), [q]);
 
+  // On mobile, picking a topic should close the drawer
+  const selectTopic = (topic) => {
+    setActiveTopic(topic);
+    setSidebarOpen(false);
+  };
+
   return (
-    <div className="min-h-screen bg-slate-50 bg-grid-pattern flex relative overflow-hidden">
+    <div className="min-h-screen bg-slate-50 dark:bg-dark-900 bg-grid-pattern flex relative overflow-hidden transition-colors duration-300">
 
       {/* Ambient background glows */}
-      <div className="absolute top-0 -left-4 w-72 h-72 bg-brand-300 rounded-full mix-blend-multiply filter blur-3xl opacity-20 animate-blob"></div>
-      <div className="absolute top-0 -right-4 w-72 h-72 bg-indigo-300 rounded-full mix-blend-multiply filter blur-3xl opacity-20 animate-blob animation-delay-2000"></div>
-      <div className="absolute -bottom-8 left-20 w-72 h-72 bg-pink-300 rounded-full mix-blend-multiply filter blur-3xl opacity-20 animate-blob animation-delay-4000"></div>
+      <div className="absolute top-0 -left-4 w-72 h-72 bg-brand-300 rounded-full mix-blend-multiply filter blur-3xl opacity-20 dark:opacity-10 animate-blob"></div>
+      <div className="absolute top-0 -right-4 w-72 h-72 bg-indigo-300 rounded-full mix-blend-multiply filter blur-3xl opacity-20 dark:opacity-10 animate-blob animation-delay-2000"></div>
+      <div className="absolute -bottom-8 left-20 w-72 h-72 bg-pink-300 rounded-full mix-blend-multiply filter blur-3xl opacity-20 dark:opacity-10 animate-blob animation-delay-4000"></div>
+
+      {/* Mobile top bar */}
+      <header className="lg:hidden fixed top-0 left-0 right-0 h-16 z-30 glass flex items-center justify-between px-4">
+        <div className="flex items-center gap-2.5 text-slate-900 dark:text-slate-100 font-bold text-lg">
+          <div className="w-7 h-7 rounded-lg bg-gradient-to-br from-brand-500 to-indigo-600 flex items-center justify-center shadow-glow">
+            <Layers className="text-white w-3.5 h-3.5" />
+          </div>
+          <span className="tracking-tight">NearleDaily</span>
+        </div>
+        <button
+          onClick={() => setSidebarOpen(true)}
+          aria-label="Open navigation menu"
+          className="w-10 h-10 -mr-1 flex items-center justify-center rounded-lg text-slate-600 dark:text-slate-300 hover:bg-slate-100/60 dark:hover:bg-white/5 transition-colors"
+        >
+          <Menu size={22} />
+        </button>
+      </header>
+
+      {/* Mobile drawer backdrop */}
+      {sidebarOpen && (
+        <div
+          onClick={() => setSidebarOpen(false)}
+          className="lg:hidden fixed inset-0 z-30 bg-slate-900/40 backdrop-blur-sm"
+        />
+      )}
 
       <Sidebar
         graphqlTopics={visibleGraphql}
         restTopics={visibleRest}
         activeTopic={activeTopic}
-        setActiveTopic={setActiveTopic}
+        setActiveTopic={selectTopic}
         searchQuery={searchQuery}
         setSearchQuery={setSearchQuery}
+        open={sidebarOpen}
+        onClose={() => setSidebarOpen(false)}
       />
 
-      <main className="ml-[280px] flex-1 min-h-screen relative z-10">
+      <ThemeToggle dark={dark} setDark={setDark} />
+
+      <main className="lg:ml-[280px] flex-1 min-h-screen relative z-10 pt-16 lg:pt-0">
         {activeTopic ? (
-          <div className="max-w-[1200px] mx-auto p-12 lg:p-16 opacity-0 animate-fade-in-up">
+          <div className="max-w-[1200px] mx-auto p-5 sm:p-8 lg:p-16 opacity-0 animate-fade-in-up">
             <EndpointViewer topic={activeTopic} />
           </div>
         ) : (
@@ -59,7 +109,7 @@ function App() {
             <Introduction
               allGraphql={allGraphql}
               allRest={allRest}
-              setActiveTopic={setActiveTopic}
+              setActiveTopic={selectTopic}
             />
           </div>
         )}
diff --git a/src/components/EndpointViewer.jsx b/src/components/EndpointViewer.jsx
index 825035c..0753197 100644
--- a/src/components/EndpointViewer.jsx
+++ b/src/components/EndpointViewer.jsx
@@ -132,8 +132,8 @@ function EndpointRow({ endpoint, topic }) {
   const urlPath = endpoint.url.split('?')[0];
 
   return (
-    <div className="py-16 border-t border-slate-200/60 group/row" id={endpoint.name}>
-      <div className="grid grid-cols-1 xl:grid-cols-12 gap-12 lg:gap-16">
+    <div className="py-10 sm:py-16 border-t border-slate-200/60 dark:border-white/10 group/row" id={endpoint.name}>
+      <div className="grid grid-cols-1 xl:grid-cols-12 gap-8 lg:gap-16">
 
         {/* Left Column: Description & Parameters */}
         <div className="xl:col-span-5 space-y-8">
@@ -142,36 +142,36 @@ function EndpointRow({ endpoint, topic }) {
               <span className={`px-2.5 py-1 rounded text-xs font-bold tracking-widest border ${methodColor}`}>
                 {endpoint.method}
               </span>
-              <h3 className="text-2xl font-bold text-slate-900 tracking-tight">
+              <h3 className="text-xl sm:text-2xl font-bold text-slate-900 dark:text-slate-100 tracking-tight break-all">
                 {endpoint.name}
               </h3>
             </div>
-            <p className="text-[15px] text-slate-600 leading-relaxed">{endpoint.description}</p>
+            <p className="text-[15px] text-slate-600 dark:text-slate-400 leading-relaxed">{endpoint.description}</p>
           </div>
 
-          <div className="bg-white border border-slate-200/80 rounded-xl p-3.5 font-mono text-sm shadow-sm flex items-start gap-2 group-hover/row:border-brand-300 transition-colors min-w-0">
+          <div className="bg-white dark:bg-dark-800 border border-slate-200/80 dark:border-white/10 rounded-xl p-3.5 font-mono text-sm shadow-sm flex items-start gap-2 group-hover/row:border-brand-300 dark:group-hover/row:border-brand-500/40 transition-colors min-w-0">
             <Server size={14} className="text-brand-400 shrink-0 mt-0.5" />
             <div className="min-w-0 flex-1">
-              <div className="text-xs text-slate-400 truncate">{topic.baseUrl}</div>
-              <div className="font-semibold text-slate-800 break-all">{urlPath}</div>
+              <div className="text-xs text-slate-400 dark:text-slate-500 truncate">{topic.baseUrl}</div>
+              <div className="font-semibold text-slate-800 dark:text-slate-200 break-all">{urlPath}</div>
             </div>
           </div>
 
           {/* Query params (GET endpoints) */}
           {endpoint.method === 'GET' && Object.keys(params).length > 0 && (
             <div className="pt-2">
-              <h4 className="text-xs font-bold text-slate-400 mb-4 uppercase tracking-widest flex items-center gap-2">
-                <span className="w-4 h-[1px] bg-slate-300"></span> Query Parameters
+              <h4 className="text-xs font-bold text-slate-400 dark:text-slate-500 mb-4 uppercase tracking-widest flex items-center gap-2">
+                <span className="w-4 h-[1px] bg-slate-300 dark:bg-slate-600"></span> Query Parameters
               </h4>
               <div className="space-y-4">
                 {Object.entries(params).map(([key, val]) => (
                   <div key={key} className="flex flex-col gap-2">
-                    <label className="text-sm font-semibold text-slate-800 flex justify-between items-center">
+                    <label className="text-sm font-semibold text-slate-800 dark:text-slate-200 flex justify-between items-center">
                       {key}
-                      <span className="text-[10px] text-slate-400 uppercase tracking-wider font-mono">string</span>
+                      <span className="text-[10px] text-slate-400 dark:text-slate-500 uppercase tracking-wider font-mono">string</span>
                     </label>
                     <input
-                      className="w-full px-3.5 py-2.5 bg-white border border-slate-200 rounded-lg text-sm focus:outline-none focus:ring-2 focus:ring-brand-500/20 focus:border-brand-500 transition-all shadow-sm text-slate-700"
+                      className="w-full px-3.5 py-2.5 bg-white dark:bg-white/5 border border-slate-200 dark:border-white/10 rounded-lg text-sm focus:outline-none focus:ring-2 focus:ring-brand-500/20 focus:border-brand-500 transition-all shadow-sm text-slate-700 dark:text-slate-200"
                       value={val}
                       placeholder={`Enter ${key}...`}
                       onChange={e => {
@@ -196,7 +196,7 @@ function EndpointRow({ endpoint, topic }) {
 
         {/* Right Column: Code Panel */}
         <div className="xl:col-span-7">
-          <div className="dark-glass rounded-2xl overflow-hidden shadow-code flex flex-col h-full min-h-[450px] transform transition-transform duration-500 group-hover/row:-translate-y-1">
+          <div className="dark-glass rounded-2xl overflow-hidden shadow-code flex flex-col h-full min-h-[360px] sm:min-h-[450px] transform transition-transform duration-500 group-hover/row:-translate-y-1">
 
             {/* macOS window dots */}
             <div className="h-10 bg-white/5 border-b border-white/5 flex items-center px-4 gap-2 shrink-0">
@@ -339,18 +339,18 @@ export default function EndpointViewer({ topic }) {
   return (
     <div className="pb-24">
       <div className="mb-12">
-        <h1 className="text-4xl lg:text-5xl font-bold text-slate-900 mb-4 tracking-tight">{topic.name}</h1>
-        <p className="text-lg text-slate-600 max-w-3xl leading-relaxed">{topic.description}</p>
+        <h1 className="text-3xl sm:text-4xl lg:text-5xl font-bold text-slate-900 dark:text-slate-100 mb-4 tracking-tight break-words">{topic.name}</h1>
+        <p className="text-base sm:text-lg text-slate-600 dark:text-slate-400 max-w-3xl leading-relaxed">{topic.description}</p>
         <div className="mt-4 flex items-center gap-3">
           <span className={`inline-flex items-center gap-1.5 text-[11px] font-bold uppercase tracking-widest px-3 py-1 rounded-full border ${
             topic.type === 'graphql'
-              ? 'bg-brand-50 text-brand-600 border-brand-100'
-              : 'bg-indigo-50 text-indigo-600 border-indigo-100'
+              ? 'bg-brand-50 dark:bg-brand-500/10 text-brand-600 dark:text-brand-400 border-brand-100 dark:border-brand-500/20'
+              : 'bg-indigo-50 dark:bg-indigo-500/10 text-indigo-600 dark:text-indigo-400 border-indigo-100 dark:border-indigo-500/20'
           }`}>
             <span className="w-1.5 h-1.5 rounded-full bg-current"></span>
             {topic.type === 'graphql' ? 'GraphQL' : 'REST API'}
           </span>
-          <span className="text-sm text-slate-400">{topic.endpoints.length} endpoint{topic.endpoints.length !== 1 ? 's' : ''}</span>
+          <span className="text-sm text-slate-400 dark:text-slate-500">{topic.endpoints.length} endpoint{topic.endpoints.length !== 1 ? 's' : ''}</span>
         </div>
       </div>
 
diff --git a/src/components/Introduction.jsx b/src/components/Introduction.jsx
index 72a3d74..9e526a2 100644
--- a/src/components/Introduction.jsx
+++ b/src/components/Introduction.jsx
@@ -22,32 +22,32 @@ export default function Introduction({ allGraphql, allRest, setActiveTopic }) {
   const allTopics = [...allGraphql, ...allRest];
 
   return (
-    <div className="max-w-[1000px] mx-auto px-12 py-20 lg:px-24 lg:py-28">
+    <div className="max-w-[1000px] mx-auto px-5 py-12 sm:px-12 sm:py-20 lg:px-24 lg:py-28">
 
-      <div className="inline-flex items-center gap-2 px-3 py-1 rounded-full bg-brand-50 border border-brand-100 text-brand-600 text-sm font-medium mb-8">
+      <div className="inline-flex items-center gap-2 px-3 py-1 rounded-full bg-brand-50 dark:bg-brand-500/10 border border-brand-100 dark:border-brand-500/20 text-brand-600 dark:text-brand-400 text-sm font-medium mb-8">
         <Zap size={14} className="fill-current" />
         v2.0 Developer API
       </div>
 
-      <h1 className="text-4xl lg:text-5xl font-bold text-slate-900 mb-6 tracking-tight">
+      <h1 className="text-3xl sm:text-4xl lg:text-5xl font-bold text-slate-900 dark:text-slate-100 mb-6 tracking-tight">
         <span className="text-gradient">NearleDaily API</span>
       </h1>
 
-      <p className="text-xl text-slate-600 mb-12 max-w-2xl leading-relaxed">
+      <p className="text-lg sm:text-xl text-slate-600 dark:text-slate-400 mb-12 max-w-2xl leading-relaxed">
         A comprehensive, lightning-fast platform designed for logistics, order management,
         and multi-tenant POS administration — available through both Hasura GraphQL and REST APIs.
       </p>
 
       <div className="mb-8">
-        <h2 className="text-xs font-bold uppercase tracking-widest text-slate-400 mb-4">Base URLs</h2>
+        <h2 className="text-xs font-bold uppercase tracking-widest text-slate-400 dark:text-slate-500 mb-4">Base URLs</h2>
         <div className="grid grid-cols-1 sm:grid-cols-2 gap-3 mb-10">
-          <div className="bg-white border border-slate-200/60 rounded-xl p-4 shadow-sm">
-            <div className="text-[11px] text-brand-600 font-bold uppercase tracking-widest mb-1.5">GraphQL</div>
-            <code className="font-mono text-sm text-slate-700">{GRAPHQL_BASE_URL}</code>
+          <div className="bg-white dark:bg-dark-800 border border-slate-200/60 dark:border-white/10 rounded-xl p-4 shadow-sm">
+            <div className="text-[11px] text-brand-600 dark:text-brand-400 font-bold uppercase tracking-widest mb-1.5">GraphQL</div>
+            <code className="font-mono text-sm text-slate-700 dark:text-slate-300 break-all">{GRAPHQL_BASE_URL}</code>
           </div>
-          <div className="bg-white border border-slate-200/60 rounded-xl p-4 shadow-sm">
-            <div className="text-[11px] text-indigo-600 font-bold uppercase tracking-widest mb-1.5">REST API</div>
-            <code className="font-mono text-sm text-slate-700">{REST_BASE_URL}</code>
+          <div className="bg-white dark:bg-dark-800 border border-slate-200/60 dark:border-white/10 rounded-xl p-4 shadow-sm">
+            <div className="text-[11px] text-indigo-600 dark:text-indigo-400 font-bold uppercase tracking-widest mb-1.5">REST API</div>
+            <code className="font-mono text-sm text-slate-700 dark:text-slate-300 break-all">{REST_BASE_URL}</code>
           </div>
         </div>
       </div>
@@ -59,14 +59,14 @@ export default function Introduction({ allGraphql, allRest, setActiveTopic }) {
             <div
               key={topic.uniqueId}
               onClick={() => setActiveTopic(topic)}
-              className="group relative bg-white p-6 rounded-2xl border border-slate-200/60 shadow-sm hover:shadow-xl hover:shadow-brand-500/5 hover:border-brand-200 transition-all duration-300 cursor-pointer overflow-hidden"
+              className="group relative bg-white dark:bg-dark-800 p-6 rounded-2xl border border-slate-200/60 dark:border-white/10 shadow-sm hover:shadow-xl hover:shadow-brand-500/5 hover:border-brand-200 dark:hover:border-brand-500/30 transition-all duration-300 cursor-pointer overflow-hidden"
               style={{ animationDelay: `${index * 80}ms` }}
             >
-              <div className="absolute top-0 right-0 w-32 h-32 bg-gradient-to-br from-brand-50 to-transparent rounded-bl-full opacity-0 group-hover:opacity-100 transition-opacity duration-500"></div>
+              <div className="absolute top-0 right-0 w-32 h-32 bg-gradient-to-br from-brand-50 dark:from-brand-500/10 to-transparent rounded-bl-full opacity-0 group-hover:opacity-100 transition-opacity duration-500"></div>
 
               <div className="relative z-10">
-                <h3 className="text-lg font-bold text-slate-900 mb-2 group-hover:text-brand-600 transition-colors flex items-center gap-2">
-                  <div className="p-1.5 bg-brand-50 text-brand-600 rounded-md group-hover:bg-brand-100 transition-colors">
+                <h3 className="text-lg font-bold text-slate-900 dark:text-slate-100 mb-2 group-hover:text-brand-600 dark:group-hover:text-brand-400 transition-colors flex items-center gap-2">
+                  <div className="p-1.5 bg-brand-50 dark:bg-brand-500/10 text-brand-600 dark:text-brand-400 rounded-md group-hover:bg-brand-100 dark:group-hover:bg-brand-500/20 transition-colors">
                     <Icon size={18} />
                   </div>
                   {topic.name}
@@ -75,14 +75,14 @@ export default function Introduction({ allGraphql, allRest, setActiveTopic }) {
                 <div className="flex items-center gap-2 mt-1 mb-2">
                   <span className={`text-[10px] font-bold uppercase tracking-widest px-2 py-0.5 rounded border ${
                     topic.type === 'graphql'
-                      ? 'bg-brand-50 text-brand-600 border-brand-100'
-                      : 'bg-indigo-50 text-indigo-600 border-indigo-100'
+                      ? 'bg-brand-50 dark:bg-brand-500/10 text-brand-600 dark:text-brand-400 border-brand-100 dark:border-brand-500/20'
+                      : 'bg-indigo-50 dark:bg-indigo-500/10 text-indigo-600 dark:text-indigo-400 border-indigo-100 dark:border-indigo-500/20'
                   }`}>
                     {topic.type === 'graphql' ? 'GraphQL' : 'REST'}
                   </span>
-                  <span className="text-[11px] text-slate-400">{topic.endpoints.length} endpoint{topic.endpoints.length !== 1 ? 's' : ''}</span>
+                  <span className="text-[11px] text-slate-400 dark:text-slate-500">{topic.endpoints.length} endpoint{topic.endpoints.length !== 1 ? 's' : ''}</span>
                 </div>
-                <p className="text-sm text-slate-500 leading-relaxed">
+                <p className="text-sm text-slate-500 dark:text-slate-400 leading-relaxed">
                   {topic.description}
                 </p>
               </div>
@@ -91,7 +91,7 @@ export default function Introduction({ allGraphql, allRest, setActiveTopic }) {
         })}
       </div>
 
-      <div className="mt-16 flex items-center gap-4 p-6 bg-slate-900 text-slate-300 rounded-2xl shadow-code">
+      <div className="mt-16 flex items-center gap-4 p-6 bg-slate-900 dark:bg-dark-700 text-slate-300 rounded-2xl shadow-code border border-transparent dark:border-white/5">
         <Code2 className="text-brand-400 shrink-0" size={24} />
         <p className="text-sm">
           Explore real-time interactive endpoints. GraphQL requests are authenticated with the admin secret. REST endpoints support CORS and can be called directly from the browser.
diff --git a/src/components/Sidebar.jsx b/src/components/Sidebar.jsx
index 38f840f..80bacf2 100644
--- a/src/components/Sidebar.jsx
+++ b/src/components/Sidebar.jsx
@@ -1,5 +1,5 @@
 import React, { useState } from 'react';
-import { Search, ChevronRight, ChevronDown, Layers, Terminal, Users, ShoppingCart, Home, Box, Link2, Truck, UserCircle, Bike, FileText, CreditCard, Wrench } from 'lucide-react';
+import { Search, ChevronRight, ChevronDown, Layers, Terminal, Users, ShoppingCart, Home, Box, Link2, Truck, UserCircle, Bike, FileText, CreditCard, Wrench, X } from 'lucide-react';
 
 const topicIcons = {
   users:      Users,
@@ -16,7 +16,7 @@ const topicIcons = {
   mobile:     Box,
 };
 
-export default function Sidebar({ graphqlTopics, restTopics, activeTopic, setActiveTopic, searchQuery, setSearchQuery }) {
+export default function Sidebar({ graphqlTopics, restTopics, activeTopic, setActiveTopic, searchQuery, setSearchQuery, open: drawerOpen = false, onClose }) {
   const [open, setOpen] = useState({ general: true, graphql: true, rest: true });
   const toggle = (key) => setOpen(prev => ({ ...prev, [key]: !prev[key] }));
 
@@ -24,10 +24,10 @@ export default function Sidebar({ graphqlTopics, restTopics, activeTopic, setAct
     <div>
       <button
         onClick={() => toggle(key)}
-        className="w-full flex items-center justify-between px-2 py-1.5 text-slate-800 font-semibold text-sm hover:text-brand-600 transition-colors group"
+        className="w-full flex items-center justify-between px-2 py-1.5 text-slate-800 dark:text-slate-200 font-semibold text-sm hover:text-brand-600 dark:hover:text-brand-400 transition-colors group"
       >
-        <span className="tracking-wide text-xs uppercase text-slate-400 group-hover:text-brand-500 transition-colors">{title}</span>
-        {open[key] ? <ChevronDown size={14} className="text-slate-400" /> : <ChevronRight size={14} className="text-slate-400" />}
+        <span className="tracking-wide text-xs uppercase text-slate-400 dark:text-slate-500 group-hover:text-brand-500 transition-colors">{title}</span>
+        {open[key] ? <ChevronDown size={14} className="text-slate-400 dark:text-slate-500" /> : <ChevronRight size={14} className="text-slate-400 dark:text-slate-500" />}
       </button>
       <div className={`mt-2 space-y-1 overflow-hidden transition-all duration-500 ${open[key] ? 'max-h-[800px] opacity-100' : 'max-h-0 opacity-0'}`}>
         {topics.map(topic => {
@@ -39,11 +39,11 @@ export default function Sidebar({ graphqlTopics, restTopics, activeTopic, setAct
               onClick={() => setActiveTopic(topic)}
               className={`w-full flex items-center gap-2.5 px-3 py-2 rounded-lg text-sm transition-all duration-200 group ${
                 isActive
-                  ? 'text-brand-700 bg-brand-50 shadow-sm font-medium'
-                  : 'text-slate-600 hover:text-slate-900 hover:bg-slate-100/50'
+                  ? 'text-brand-700 dark:text-brand-300 bg-brand-50 dark:bg-brand-500/10 shadow-sm font-medium'
+                  : 'text-slate-600 dark:text-slate-400 hover:text-slate-900 dark:hover:text-slate-100 hover:bg-slate-100/50 dark:hover:bg-white/5'
               }`}
             >
-              <Icon size={16} className={`${isActive ? 'text-brand-500' : 'text-slate-400 group-hover:text-slate-500'} transition-colors`} />
+              <Icon size={16} className={`${isActive ? 'text-brand-500' : 'text-slate-400 dark:text-slate-500 group-hover:text-slate-500 dark:group-hover:text-slate-400'} transition-colors`} />
               {topic.name}
             </button>
           );
@@ -53,21 +53,31 @@ export default function Sidebar({ graphqlTopics, restTopics, activeTopic, setAct
   );
 
   return (
-    <div className="w-[280px] glass h-screen fixed top-0 left-0 flex flex-col z-20 transition-all">
+    <div className={`w-[280px] glass h-screen fixed top-0 left-0 flex flex-col z-40 transition-transform duration-300 lg:translate-x-0 ${drawerOpen ? 'translate-x-0' : '-translate-x-full'}`}>
 
       {/* Brand Header */}
-      <div className="p-6 border-b border-slate-100/50">
-        <div className="flex items-center gap-3 text-slate-900 font-bold text-xl mb-6">
-          <div className="w-8 h-8 rounded-lg bg-gradient-to-br from-brand-500 to-indigo-600 flex items-center justify-center shadow-glow">
-            <Layers className="text-white w-4 h-4" />
+      <div className="p-6 border-b border-slate-100/50 dark:border-white/5">
+        <div className="flex items-center justify-between mb-6">
+          <div className="flex items-center gap-3 text-slate-900 dark:text-slate-100 font-bold text-xl">
+            <div className="w-8 h-8 rounded-lg bg-gradient-to-br from-brand-500 to-indigo-600 flex items-center justify-center shadow-glow">
+              <Layers className="text-white w-4 h-4" />
+            </div>
+            <span className="tracking-tight">NearleDaily</span>
           </div>
-          <span className="tracking-tight">NearleDaily</span>
+          {/* Close button (mobile drawer only) */}
+          <button
+            onClick={onClose}
+            aria-label="Close navigation menu"
+            className="lg:hidden w-8 h-8 -mr-1 flex items-center justify-center rounded-lg text-slate-500 dark:text-slate-400 hover:bg-slate-100/60 dark:hover:bg-white/5 transition-colors"
+          >
+            <X size={18} />
+          </button>
         </div>
         <div className="relative group">
           <Search className="w-4 h-4 absolute left-3 top-3 text-slate-400 group-focus-within:text-brand-500 transition-colors" />
           <input
             type="text"
-            className="w-full pl-9 pr-3 py-2.5 bg-slate-50/50 border border-slate-200/60 rounded-xl text-sm focus:outline-none focus:ring-2 focus:ring-brand-500/20 focus:border-brand-500 focus:bg-white transition-all placeholder:text-slate-400"
+            className="w-full pl-9 pr-3 py-2.5 bg-slate-50/50 dark:bg-white/5 border border-slate-200/60 dark:border-white/10 rounded-xl text-sm text-slate-700 dark:text-slate-200 focus:outline-none focus:ring-2 focus:ring-brand-500/20 focus:border-brand-500 focus:bg-white dark:focus:bg-white/10 transition-all placeholder:text-slate-400 dark:placeholder:text-slate-500"
             placeholder="Search documentation..."
             value={searchQuery}
             onChange={(e) => setSearchQuery(e.target.value)}
@@ -82,21 +92,21 @@ export default function Sidebar({ graphqlTopics, restTopics, activeTopic, setAct
           <div>
             <button
               onClick={() => toggle('general')}
-              className="w-full flex items-center justify-between px-2 py-1.5 text-slate-800 font-semibold text-sm hover:text-brand-600 transition-colors group"
+              className="w-full flex items-center justify-between px-2 py-1.5 text-slate-800 dark:text-slate-200 font-semibold text-sm hover:text-brand-600 dark:hover:text-brand-400 transition-colors group"
             >
-              <span className="tracking-wide text-xs uppercase text-slate-400 group-hover:text-brand-500 transition-colors">Getting Started</span>
-              {open.general ? <ChevronDown size={14} className="text-slate-400" /> : <ChevronRight size={14} className="text-slate-400" />}
+              <span className="tracking-wide text-xs uppercase text-slate-400 dark:text-slate-500 group-hover:text-brand-500 transition-colors">Getting Started</span>
+              {open.general ? <ChevronDown size={14} className="text-slate-400 dark:text-slate-500" /> : <ChevronRight size={14} className="text-slate-400 dark:text-slate-500" />}
             </button>
             <div className={`mt-2 space-y-1 overflow-hidden transition-all duration-300 ${open.general ? 'max-h-40 opacity-100' : 'max-h-0 opacity-0'}`}>
               <button
                 onClick={() => setActiveTopic(null)}
                 className={`w-full flex items-center gap-2.5 px-3 py-2 rounded-lg text-sm transition-all duration-200 ${
                   !activeTopic
-                    ? 'text-brand-700 bg-brand-50 shadow-sm font-medium'
-                    : 'text-slate-600 hover:text-slate-900 hover:bg-slate-100/50'
+                    ? 'text-brand-700 dark:text-brand-300 bg-brand-50 dark:bg-brand-500/10 shadow-sm font-medium'
+                    : 'text-slate-600 dark:text-slate-400 hover:text-slate-900 dark:hover:text-slate-100 hover:bg-slate-100/50 dark:hover:bg-white/5'
                 }`}
               >
-                <Terminal size={16} className={!activeTopic ? 'text-brand-500' : 'text-slate-400'} />
+                <Terminal size={16} className={!activeTopic ? 'text-brand-500' : 'text-slate-400 dark:text-slate-500'} />
                 Introduction
               </button>
             </div>
diff --git a/src/components/ThemeToggle.jsx b/src/components/ThemeToggle.jsx
new file mode 100644
index 0000000..589db4c
--- /dev/null
+++ b/src/components/ThemeToggle.jsx
@@ -0,0 +1,21 @@
+import React from 'react';
+import { Sun, Moon } from 'lucide-react';
+
+export default function ThemeToggle({ dark, setDark }) {
+  return (
+    <button
+      onClick={() => setDark(d => !d)}
+      aria-label={dark ? 'Switch to light theme' : 'Switch to dark theme'}
+      title={dark ? 'Light mode' : 'Dark mode'}
+      className="fixed top-3.5 right-16 lg:top-4 lg:right-4 z-50 w-11 h-11 rounded-full flex items-center justify-center
+                 glass shadow-glass border border-slate-200/60 dark:border-white/10
+                 text-slate-600 dark:text-slate-300 hover:text-brand-500 dark:hover:text-brand-400
+                 hover:shadow-glow hover:-translate-y-0.5 active:translate-y-0
+                 transition-all duration-300"
+    >
+      {dark
+        ? <Sun size={18} className="transition-transform duration-300" />
+        : <Moon size={18} className="transition-transform duration-300" />}
+    </button>
+  );
+}
diff --git a/src/index.css b/src/index.css
index 46e6aae..680f1a9 100644
--- a/src/index.css
+++ b/src/index.css
@@ -8,13 +8,19 @@
   body {
     @apply bg-slate-50 text-slate-800 font-sans antialiased selection:bg-brand-500/30 selection:text-brand-900;
   }
+  html.dark body {
+    @apply bg-dark-900 text-slate-300 selection:bg-brand-500/30 selection:text-brand-100;
+  }
 }
 
 @layer utilities {
   .glass {
     @apply bg-white/70 backdrop-blur-md border border-white/40 shadow-glass;
   }
-  
+  html.dark .glass {
+    @apply bg-dark-800/80 border-white/5;
+  }
+
   .dark-glass {
     @apply bg-dark-900/90 backdrop-blur-xl border border-white/5;
   }
@@ -40,9 +46,26 @@
   @apply bg-slate-700 hover:bg-slate-600;
 }
 
+html.dark ::-webkit-scrollbar-thumb {
+  @apply bg-dark-600 hover:bg-slate-600;
+}
+
 /* Background Pattern */
 .bg-grid-pattern {
   background-image: linear-gradient(to right, #f1f5f9 1px, transparent 1px),
     linear-gradient(to bottom, #f1f5f9 1px, transparent 1px);
   background-size: 40px 40px;
+}
+html.dark .bg-grid-pattern {
+  background-image: linear-gradient(to right, rgba(255, 255, 255, 0.03) 1px, transparent 1px),
+    linear-gradient(to bottom, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
+}
+
+/* Hide scrollbar utility (used in sidebar / panes) */
+.scrollbar-hide {
+  -ms-overflow-style: none;
+  scrollbar-width: none;
+}
+.scrollbar-hide::-webkit-scrollbar {
+  display: none;
 }
\ No newline at end of file
diff --git a/tailwind.config.js b/tailwind.config.js
index c4d6358..3274b9b 100644
--- a/tailwind.config.js
+++ b/tailwind.config.js
@@ -1,5 +1,6 @@
 /** @type {import('tailwindcss').Config} */
 export default {
+  darkMode: 'class',
   content: [
     "./index.html",
     "./src/**/*.{js,ts,jsx,tsx}",