diff --git a/expensetracker.css b/expensetracker.css
index ac1acb9..2090a3e 100644
--- a/expensetracker.css
+++ b/expensetracker.css
@@ -30,6 +30,39 @@
   --shadow-card: 0 8px 16px rgba(0, 0, 0, 0.3);
 }
 
+/* Light Mode Theme */
+[data-theme="light"] {
+  /* Color Palette */
+  --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
+  --secondary-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
+  --success-gradient: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
+  --warning-gradient: linear-gradient(135deg, #fa709a 0%, #fee140 100%);
+  --dark-gradient: linear-gradient(135deg, #f5f5f5 0%, #e0e0e0 100%);
+  
+  /* Background Colors */
+  --bg-primary: #ffffff;
+  --bg-secondary: #f5f5f5;
+  --bg-tertiary: #efefef;
+  --bg-glass: rgba(0, 0, 0, 0.05);
+  
+  /* Text Colors */
+  --text-primary: #1a1a1a;
+  --text-secondary: #666666;
+  --text-accent: #667eea;
+  
+  /* Accent Colors */
+  --accent-primary: #667eea;
+  --accent-secondary: #764ba2;
+  --success: #00c853;
+  --error: #d32f2f;
+  --warning: #ffa000;
+  
+  /* Shadows */
+  --shadow-glass: 0 8px 32px 0 rgba(0, 0, 0, 0.1);
+  --shadow-hover: 0 15px 35px rgba(0, 0, 0, 0.15);
+  --shadow-card: 0 8px 16px rgba(0, 0, 0, 0.1);
+}
+
 * {
   margin: 0;
   padding: 0;
@@ -134,6 +167,32 @@ body {
   gap: 0.75rem;
 }
 
+.theme-toggle-btn {
+  background: rgba(255, 255, 255, 0.1);
+  border: 1px solid rgba(100, 255, 218, 0.3);
+  color: var(--accent-primary);
+  width: 40px;
+  height: 40px;
+  border-radius: 50%;
+  cursor: pointer;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  font-size: 1.2rem;
+  transition: all 0.3s ease;
+  margin-right: 1rem;
+}
+
+.theme-toggle-btn:hover {
+  background: rgba(100, 255, 218, 0.2);
+  border-color: var(--accent-primary);
+  transform: scale(1.1);
+}
+
+.theme-toggle-btn.light-mode {
+  color: #ffd700;
+}
+
 .profile-img {
   width: 40px;
   height: 40px;
@@ -1668,6 +1727,9 @@ body {
   }
 }
 
+#scrollToTopBtn svg {
+  display: block;
+}
 input,
 select,
 button {
diff --git a/index.html b/index.html
index a380891..13c4294 100644
--- a/index.html
+++ b/index.html
@@ -1,6 +1,1666 @@
 <!DOCTYPE html>
 <html lang="en">
 
+    <!-- PWA Meta Tags -->
+    <meta name="mobile-web-app-capable" content="yes">
+    <meta name="apple-mobile-web-app-capable" content="yes">
+    <meta name="apple-mobile-web-app-status-bar-style" content="black-translucent">
+    <meta name="apple-mobile-web-app-title" content="ExpenseFlow">
+    <meta name="msapplication-TileColor" content="#0f0f23">
+    <meta name="msapplication-navbutton-color" content="#64ffda">
+    
+    <!-- Manifest -->
+    <link rel="manifest" href="manifest.json">
+    
+    <!-- Apple Touch Icons -->
+    <link rel="apple-touch-icon" href="data:image/svg+xml;base64,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">
+    
+    <title>ExpenseFlow - Smart Money Management</title>
+    <link rel="preconnect" href="https://fonts.googleapis.com">
+    <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
+    <link href="https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap" rel="stylesheet">
+    <style>
+      :root {
+        /* Color Palette */
+        --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
+        --secondary-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
+        --success-gradient: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
+        --warning-gradient: linear-gradient(135deg, #fa709a 0%, #fee140 100%);
+        --dark-gradient: linear-gradient(135deg, #232526 0%, #414345 100%);
+        
+        /* Background Colors */
+        --bg-primary: #0f0f23;
+        --bg-secondary: #1a1a2e;
+        --bg-tertiary: #16213e;
+        --bg-glass: rgba(255, 255, 255, 0.1);
+        
+        /* Text Colors */
+        --text-primary: #ffffff;
+        --text-secondary: #b4b4b4;
+        --text-accent: #64ffda;
+        
+        /* Accent Colors */
+        --accent-primary: #64ffda;
+        --accent-secondary: #ff6b9d;
+        --success: #00e676;
+        --error: #ff5722;
+        --warning: #ffc107;
+        
+        /* Shadows */
+        --shadow-glass: 0 8px 32px 0 rgba(31, 38, 135, 0.37);
+        --shadow-hover: 0 15px 35px rgba(0, 0, 0, 0.1);
+        --shadow-card: 0 8px 16px rgba(0, 0, 0, 0.3);
+      }
+
+      /* Light Mode Theme */
+      [data-theme="light"] {
+        /* Color Palette */
+        --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
+        --secondary-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
+        --success-gradient: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
+        --warning-gradient: linear-gradient(135deg, #fa709a 0%, #fee140 100%);
+        --dark-gradient: linear-gradient(135deg, #f5f5f5 0%, #e0e0e0 100%);
+        
+        /* Background Colors */
+        --bg-primary: #ffffff;
+        --bg-secondary: #f5f5f5;
+        --bg-tertiary: #efefef;
+        --bg-glass: rgba(0, 0, 0, 0.05);
+        
+        /* Text Colors */
+        --text-primary: #1a1a1a;
+        --text-secondary: #666666;
+        --text-accent: #667eea;
+        
+        /* Accent Colors */
+        --accent-primary: #667eea;
+        --accent-secondary: #764ba2;
+        --success: #00c853;
+        --error: #d32f2f;
+        --warning: #ffa000;
+        
+        /* Shadows */
+        --shadow-glass: 0 8px 32px 0 rgba(0, 0, 0, 0.1);
+        --shadow-hover: 0 15px 35px rgba(0, 0, 0, 0.15);
+        --shadow-card: 0 8px 16px rgba(0, 0, 0, 0.1);
+      }
+
+      * {
+        margin: 0;
+        padding: 0;
+        box-sizing: border-box;
+      }
+
+      *,
+      *::before,
+      *::after {
+        box-sizing: border-box;
+      }
+
+      html, body {
+        width: 100%;
+        max-width: 100%;
+        overflow-x: hidden;
+      }
+
+      html {
+        scroll-behavior: smooth;
+      }
+
+      body {
+        font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
+        background: var(--bg-primary);
+        background-image: 
+          radial-gradient(circle at 20% 80%, rgba(120, 119, 198, 0.3) 0%, transparent 50%),
+          radial-gradient(circle at 80% 20%, rgba(255, 107, 157, 0.3) 0%, transparent 50%),
+          radial-gradient(circle at 40% 40%, rgba(100, 255, 218, 0.2) 0%, transparent 50%);
+        min-height: 100vh;
+        color: var(--text-primary);
+        line-height: 1.6;
+        overflow-x: hidden;
+        transition: background-color 0.3s ease, color 0.3s ease;
+      }
+
+      [data-theme="light"] body {
+        background-image: 
+          radial-gradient(circle at 20% 80%, rgba(102, 126, 234, 0.1) 0%, transparent 50%),
+          radial-gradient(circle at 80% 20%, rgba(240, 147, 251, 0.1) 0%, transparent 50%),
+          radial-gradient(circle at 40% 40%, rgba(102, 126, 234, 0.05) 0%, transparent 50%);
+      }
+
+      /* Header Styles */
+      .header {
+        position: fixed;
+        top: 0;
+        width: 100%;
+        z-index: 1000;
+        backdrop-filter: blur(20px);
+        background: rgba(15, 15, 35, 0.8);
+        border-bottom: 1px solid rgba(255, 255, 255, 0.1);
+        transition: background 0.3s ease, border-color 0.3s ease;
+      }
+
+      [data-theme="light"] .header {
+        background: rgba(255, 255, 255, 0.9);
+        border-bottom: 1px solid rgba(0, 0, 0, 0.1);
+      }
+
+      .navbar {
+        padding: 1rem 0;
+      }
+
+      .nav-container {
+        max-width: 1200px;
+        margin: 0 auto;
+        padding: 0 2rem;
+        display: flex;
+        justify-content: space-between;
+        align-items: center;
+      }
+
+      .nav-logo {
+        display: flex;
+        align-items: center;
+        gap: 0.5rem;
+        font-size: 1.5rem;
+        font-weight: 700;
+        color: var(--accent-primary);
+      }
+
+      .nav-logo i {
+        font-size: 2rem;
+        background: var(--primary-gradient);
+        -webkit-background-clip: text;
+        -webkit-text-fill-color: transparent;
+        background-clip: text;
+      }
+
+      .nav-menu {
+        display: flex;
+        gap: 2rem;
+        list-style: none;
+      }
+
+      .nav-link {
+        color: var(--text-secondary);
+        text-decoration: none;
+        font-weight: 500;
+        padding: 0.5rem 1rem;
+        border-radius: 0.5rem;
+        transition: all 0.3s ease;
+        position: relative;
+      }
+
+      .nav-link:hover,
+      .nav-link.active {
+        color: var(--accent-primary);
+        background: rgba(100, 255, 218, 0.1);
+      }
+
+      .user-profile {
+        display: flex;
+        align-items: center;
+        gap: 0.75rem;
+      }
+
+      .profile-img {
+        width: 40px;
+        height: 40px;
+        border-radius: 50%;
+        border: 2px solid var(--accent-primary);
+        object-fit: cover;
+      }
+
+      .username {
+        font-weight: 500;
+        color: var(--text-primary);
+      }
+
+      .nav-toggle {
+        display: none;
+        flex-direction: column;
+        cursor: pointer;
+        z-index: 1001;
+      }
+
+      .bar {
+        width: 25px;
+        height: 3px;
+        background: var(--accent-primary);
+        margin: 3px 0;
+        transition: 0.3s;
+        border-radius: 5px;
+      }
+
+      /* Main Content */
+      .main-content {
+        padding-top: 100px;
+        min-height: 100vh;
+      }
+      
+      .hero-section {
+        text-align: center;
+        padding: 3rem 2rem;
+        max-width: 800px;
+        margin: 0 auto;
+        background: linear-gradient(135deg, 
+          rgba(100, 255, 218, 0.1) 0%, 
+          rgba(15, 15, 35, 0.8) 50%, 
+          rgba(26, 26, 46, 0.1) 100%);
+        border-radius: 20px;
+        position: relative;
+        overflow: hidden;
+      }
+
+      .hero-section::before {
+        content: '';
+        position: absolute;
+        top: -50%;
+        left: -50%;
+        width: 200%;
+        height: 200%;
+        background: radial-gradient(circle, 
+          rgba(100, 255, 218, 0.1) 0%, 
+          transparent 70%);
+        animation: float 6s ease-in-out infinite;
+      }
+
+      @keyframes float {
+        0%, 100% { transform: translate(0, 0) rotate(0deg); }
+        50% { transform: translate(-20px, -20px) rotate(180deg); }
+      }
+
+      .hero-title {
+        font-size: 3.5rem;
+        font-weight: 700;
+        background: linear-gradient(135deg, #64ffda 0%, #00b4d8 100%);
+        -webkit-background-clip: text;
+        -webkit-text-fill-color: transparent;
+        background-clip: text;
+        margin-bottom: 1rem;
+        position: relative;
+        z-index: 1;
+        animation: fadeInUp 1s ease-out;
+      }
+
+      .hero-subtitle {
+        font-size: 1.2rem;
+        color: var(--text-secondary);
+        margin-bottom: 2rem;
+        animation: fadeInUp 1s ease-out 0.2s both;
+        position: relative;
+        z-index: 1;
+        max-width: 600px;
+        margin: 0 auto;
+        line-height: 1.8;
+      }
+
+      .container {
+        width: 100%;
+        max-width: 1100px;
+        margin: 0 auto;
+        padding: 0 2rem;
+      }
+
+      /* Balance Card */
+      .balance-card {
+        background: rgba(255, 255, 255, 0.05);
+        backdrop-filter: blur(20px);
+        border-radius: 20px;
+        border: 1px solid rgba(255, 255, 255, 0.1);
+        padding: 2rem;
+        text-align: center;
+        box-shadow: var(--shadow-glass);
+        transition: transform 0.3s ease, box-shadow 0.3s ease;
+        animation: fadeInUp 1s ease-out 0.4s both;
+        position: relative;
+        overflow: hidden;
+        margin-bottom: 2rem;
+      }
+
+      .balance-card::before {
+        content: '';
+        position: absolute;
+        top: 0;
+        left: 0;
+        right: 0;
+        height: 4px;
+        background: linear-gradient(90deg, #64ffda, #00b4d8);
+      }
+
+      .balance-card:hover {
+        transform: translateY(-5px);
+        box-shadow: var(--shadow-hover);
+      }
+
+      .balance-header {
+        display: flex;
+        align-items: center;
+        justify-content: center;
+        gap: 0.5rem;
+        margin-bottom: 1rem;
+      }
+
+      .balance-header i {
+        color: var(--accent-primary);
+        font-size: 1.8rem;
+      }
+
+      .balance-header h4 {
+        color: var(--text-secondary);
+        font-weight: 500;
+        text-transform: uppercase;
+        letter-spacing: 1px;
+        font-size: 0.9rem;
+      }
+
+      .balance-amount {
+        font-size: 3rem;
+        font-weight: 700;
+        color: var(--text-primary);
+        margin: 1rem 0;
+        text-shadow: 0 0 20px rgba(100, 255, 218, 0.3);
+      }
+
+      .balance-trend {
+        display: flex;
+        align-items: center;
+        justify-content: center;
+        gap: 0.5rem;
+      }
+
+      .trend-indicator {
+        font-size: 1.5rem;
+        font-weight: bold;
+      }
+
+      .trend-indicator.positive {
+        color: var(--success);
+      }
+
+      .trend-text {
+        color: var(--text-secondary);
+        font-size: 0.9rem;
+      }
+
+      /* Income & Expense Cards */
+      .inc-exp-container {
+        display: flex;
+        width: 100%;
+        max-width: 100%;
+        gap: 1rem;
+        margin-bottom: 2rem;
+      }
+
+      .income-card,
+      .expense-card {
+        background: rgba(255, 255, 255, 0.05);
+        backdrop-filter: blur(20px);
+        border-radius: 15px;
+        border: 1px solid rgba(255, 255, 255, 0.1);
+        padding: 1.5rem;
+        display: flex;
+        align-items: center;
+        gap: 1rem;
+        box-shadow: var(--shadow-glass);
+        transition: all 0.3s ease;
+        flex: 1;
+      }
+
+      .income-card:hover,
+      .expense-card:hover {
+        transform: translateY(-3px);
+        box-shadow: var(--shadow-hover);
+        border-color: rgba(100, 255, 218, 0.2);
+      }
+
+      .card-icon {
+        width: 60px;
+        height: 60px;
+        border-radius: 15px;
+        display: flex;
+        align-items: center;
+        justify-content: center;
+        font-size: 1.5rem;
+        color: white;
+      }
+
+      .income-icon {
+        background: var(--success-gradient);
+      }
+
+      .expense-icon {
+        background: var(--warning-gradient);
+      }
+
+      .card-content h4 {
+        color: var(--text-secondary);
+        font-size: 0.9rem;
+        font-weight: 500;
+        text-transform: uppercase;
+        letter-spacing: 1px;
+        margin-bottom: 0.5rem;
+      }
+
+      .money-plus {
+        color: var(--success);
+        font-size: 1.5rem;
+        font-weight: 600;
+      }
+
+      .money-minus {
+        color: var(--error);
+        font-size: 1.5rem;
+        font-weight: 600;
+      }
+
+      /* History Section */
+      .history-section {
+        background: rgba(255, 255, 255, 0.05);
+        backdrop-filter: blur(20px);
+        border-radius: 20px;
+        border: 1px solid rgba(255, 255, 255, 0.1);
+        padding: 2rem;
+        box-shadow: var(--shadow-glass);
+        animation: fadeInUp 1s ease-out 0.8s both;
+        margin-bottom: 2rem;
+      }
+
+      .section-header {
+        display: flex;
+        flex-direction: column;
+        margin-bottom: 1.5rem;
+        gap: 1rem;
+      }
+
+      .section-header h3 {
+        color: var(--text-primary);
+        font-size: 1.3rem;
+        font-weight: 600;
+        display: flex;
+        align-items: center;
+        gap: 0.5rem;
+        border-bottom: none;
+        padding-bottom: 0;
+        margin: 0;
+      }
+
+      .section-header h3 i {
+        color: var(--accent-primary);
+      }
+
+      .filter-controls {
+        display: flex;
+        flex-direction: column;
+        gap: 1rem;
+      }
+
+      .search-container {
+        position: relative;
+        max-width: 300px;
+      }
+
+      .search-input {
+        width: 100%;
+        padding: 0.75rem 1rem 0.75rem 2.5rem;
+        border: 1px solid rgba(255, 255, 255, 0.2);
+        border-radius: 25px;
+        background: rgba(255, 255, 255, 0.05);
+        backdrop-filter: blur(10px);
+        color: var(--text-primary);
+        font-size: 0.9rem;
+        transition: all 0.3s ease;
+      }
+
+      .search-input:focus {
+        outline: none;
+        border-color: var(--accent-primary);
+        box-shadow: 0 0 0 3px rgba(100, 255, 218, 0.1);
+      }
+
+      .search-input::placeholder {
+        color: var(--text-secondary);
+      }
+
+      .search-icon {
+        position: absolute;
+        left: 0.75rem;
+        top: 50%;
+        transform: translateY(-50%);
+        color: var(--text-secondary);
+        font-size: 0.9rem;
+      }
+
+      .filter-buttons {
+        display: flex;
+        gap: 0.5rem;
+        align-items: center;
+        flex-wrap: wrap;
+      }
+
+      .advanced-filters {
+        display: flex;
+        gap: 1rem;
+        align-items: center;
+        flex-wrap: wrap;
+        padding: 1rem;
+        background: rgba(255, 255, 255, 0.03);
+        border-radius: 15px;
+        border: 1px solid rgba(255, 255, 255, 0.1);
+      }
+
+      .category-select,
+      .date-input,
+      .amount-input {
+        padding: 0.75rem 1rem;
+        border: 1px solid rgba(255, 255, 255, 0.2);
+        border-radius: 8px;
+        background: rgba(255, 255, 255, 0.05);
+        backdrop-filter: blur(10px);
+        color: var(--text-primary);
+        font-size: 0.9rem;
+        cursor: pointer;
+        transition: all 0.3s ease;
+        min-width: 120px;
+      }
+
+      .category-select:focus,
+      .date-input:focus,
+      .amount-input:focus {
+        outline: none;
+        border-color: var(--accent-primary);
+        background: rgba(100, 255, 218, 0.1);
+      }
+
+      .category-select option {
+        background: var(--bg-secondary);
+        color: var(--text-primary);
+      }
+
+      .date-filters,
+      .amount-filters {
+        display: flex;
+        gap: 0.5rem;
+        align-items: center;
+      }
+
+      .date-input,
+      .amount-input {
+        cursor: text;
+      }
+
+      .amount-input::placeholder,
+      .date-input::placeholder {
+        color: var(--text-secondary);
+      }
+
+      .clear-filters-btn {
+        padding: 0.75rem 1.5rem;
+        background: rgba(255, 87, 34, 0.2);
+        color: var(--error);
+        border: 1px solid rgba(255, 87, 34, 0.3);
+        border-radius: 8px;
+        cursor: pointer;
+        transition: all 0.3s ease;
+        font-size: 0.9rem;
+        display: flex;
+        align-items: center;
+        gap: 0.5rem;
+      }
+
+      .clear-filters-btn:hover {
+        background: rgba(255, 87, 34, 0.3);
+        border-color: var(--error);
+      }
+
+      .filter-btn {
+        padding: 0.75rem 1.5rem;
+        border: 1px solid rgba(255, 255, 255, 0.2);
+        background: transparent;
+        color: var(--text-secondary);
+        border-radius: 25px;
+        cursor: pointer;
+        transition: all 0.3s ease;
+        font-size: 0.9rem;
+        font-weight: 500;
+      }
+
+      .filter-btn:hover,
+      .filter-btn.active {
+        background: var(--accent-primary);
+        color: var(--bg-primary);
+        border-color: var(--accent-primary);
+      }
+
+      .list {
+        list-style: none;
+        padding: 0;
+        max-height: 400px;
+        overflow-y: auto;
+        scrollbar-width: thin;
+        scrollbar-color: var(--accent-primary) transparent;
+      }
+
+      .list::-webkit-scrollbar {
+        width: 8px;
+      }
+
+      .list::-webkit-scrollbar-track {
+        background: rgba(255, 255, 255, 0.1);
+        border-radius: 4px;
+      }
+
+      .list::-webkit-scrollbar-thumb {
+        background: var(--accent-primary);
+        border-radius: 4px;
+      }
+
+      .list li {
+        background: rgba(255, 255, 255, 0.05);
+        backdrop-filter: blur(10px);
+        border-radius: 12px;
+        border: 1px solid rgba(255, 255, 255, 0.1);
+        padding: 1rem;
+        margin-bottom: 0.5rem;
+        display: flex;
+        justify-content: space-between;
+        align-items: center;
+        position: relative;
+        transition: all 0.3s ease;
+        animation: slideInLeft 0.3s ease-out;
+        max-width: 100%;
+        word-break: break-word;
+      }
+
+      .list li:hover {
+        transform: translateX(5px);
+        background: rgba(255, 255, 255, 0.1);
+      }
+
+      .list li.plus {
+        border-left: 4px solid var(--success);
+      }
+
+      .list li.minus {
+        border-left: 4px solid var(--error);
+      }
+
+      .delete-btn {
+        position: absolute;
+        left: -40px;
+        top: 50%;
+        transform: translateY(-50%);
+        background: var(--error);
+        color: white;
+        border: none;
+        width: 30px;
+        height: 30px;
+        border-radius: 50%;
+        cursor: pointer;
+        opacity: 0;
+        transition: all 0.3s ease;
+        font-size: 0.9rem;
+        display: flex;
+        align-items: center;
+        justify-content: center;
+      }
+
+      .list li:hover .delete-btn {
+        opacity: 1;
+      }
+
+      .delete-btn:hover {
+        background: #d32f2f;
+        transform: translateY(-50%) scale(1.1);
+      }
+
+      /* Data Management Section */
+      .data-management-section {
+        background: rgba(255, 255, 255, 0.05);
+        backdrop-filter: blur(20px);
+        border-radius: 20px;
+        border: 1px solid rgba(255, 255, 255, 0.1);
+        padding: 2rem;
+        box-shadow: var(--shadow-glass);
+        animation: fadeInUp 1s ease-out 0.9s both;
+        margin-bottom: 2rem;
+      }
+
+      .data-management-section h3 {
+        color: var(--text-primary);
+        font-size: 1.3rem;
+        font-weight: 600;
+        display: flex;
+        align-items: center;
+        gap: 0.5rem;
+        margin-bottom: 1.5rem;
+      }
+
+      .data-management-section h3 i {
+        color: var(--accent-primary);
+      }
+
+      .data-actions {
+        display: grid;
+        grid-template-columns: 1fr 1fr;
+        gap: 2rem;
+      }
+
+      .export-section,
+      .import-section {
+        display: flex;
+        flex-direction: column;
+        gap: 1rem;
+      }
+
+      .export-section h4,
+      .import-section h4 {
+        color: var(--text-secondary);
+        font-size: 1rem;
+        font-weight: 500;
+        margin-bottom: 0.5rem;
+      }
+
+      .export-buttons {
+        display: flex;
+        gap: 1rem;
+      }
+
+      .export-btn {
+        padding: 0.75rem 1.5rem;
+        background: var(--success-gradient);
+        color: white;
+        border: none;
+        border-radius: 10px;
+        font-size: 0.9rem;
+        font-weight: 500;
+        cursor: pointer;
+        transition: all 0.3s ease;
+        display: flex;
+        align-items: center;
+        gap: 0.5rem;
+      }
+
+      .export-btn:hover {
+        transform: translateY(-2px);
+        box-shadow: 0 8px 25px rgba(76, 175, 80, 0.3);
+      }
+
+      .import-controls {
+        display: flex;
+        gap: 1rem;
+        align-items: center;
+      }
+
+      .file-input {
+        display: none;
+      }
+
+      .file-label {
+        padding: 0.75rem 1.5rem;
+        background: rgba(255, 255, 255, 0.1);
+        color: var(--text-primary);
+        border: 1px solid rgba(255, 255, 255, 0.2);
+        border-radius: 10px;
+        cursor: pointer;
+        transition: all 0.3s ease;
+        display: flex;
+        align-items: center;
+        gap: 0.5rem;
+        font-size: 0.9rem;
+        font-weight: 500;
+      }
+
+      .file-label:hover {
+        background: rgba(255, 255, 255, 0.15);
+        border-color: var(--accent-primary);
+      }
+
+      .import-btn {
+        padding: 0.75rem 1.5rem;
+        background: var(--primary-gradient);
+        color: white;
+        border: none;
+        border-radius: 10px;
+        font-size: 0.9rem;
+        font-weight: 500;
+        cursor: pointer;
+        transition: all 0.3s ease;
+        display: flex;
+        align-items: center;
+        gap: 0.5rem;
+      }
+
+      .import-btn:disabled {
+        background: rgba(255, 255, 255, 0.1);
+        color: var(--text-secondary);
+        cursor: not-allowed;
+      }
+
+      .import-btn:not(:disabled):hover {
+        transform: translateY(-2px);
+        box-shadow: 0 8px 25px rgba(102, 126, 234, 0.3);
+      }
+
+      .import-options {
+        margin-top: 1rem;
+      }
+
+      .checkbox-label {
+        display: flex;
+        align-items: center;
+        gap: 0.75rem;
+        color: var(--text-secondary);
+        font-size: 0.9rem;
+        cursor: pointer;
+      }
+
+      .checkbox-label input[type="checkbox"] {
+        width: 18px;
+        height: 18px;
+        accent-color: var(--accent-primary);
+      }
+
+      /* Form Section */
+      .form-section {
+        background: rgba(255, 255, 255, 0.05);
+        backdrop-filter: blur(20px);
+        border-radius: 20px;
+        border: 1px solid rgba(255, 255, 255, 0.1);
+        padding: 2rem;
+        box-shadow: var(--shadow-glass);
+        animation: fadeInUp 1s ease-out 1s both;
+      }
+
+      .form-section h3 {
+        color: var(--text-primary);
+        font-size: 1.3rem;
+        font-weight: 600;
+        display: flex;
+        align-items: center;
+        gap: 0.5rem;
+        margin-bottom: 1.5rem;
+        border-bottom: none;
+        padding-bottom: 0;
+      }
+
+      .form-section h3 i {
+        color: var(--accent-primary);
+      }
+
+      .transaction-form {
+        display: flex;
+        flex-direction: column;
+        gap: 1.5rem;
+      }
+
+      .form-row {
+        display: grid;
+        grid-template-columns: 1fr 1fr;
+        gap: 1rem;
+      }
+
+      .form-control {
+        display: flex;
+        flex-direction: column;
+        gap: 0.5rem;
+      }
+
+      .form-control label {
+        color: var(--text-secondary);
+        font-weight: 500;
+        font-size: 0.9rem;
+        text-transform: uppercase;
+        letter-spacing: 1px;
+      }
+
+      .form-control input {
+        padding: 1rem;
+        border: 1px solid rgba(255, 255, 255, 0.2);
+        border-radius: 10px;
+        background: rgba(255, 255, 255, 0.05);
+        backdrop-filter: blur(10px);
+        color: var(--text-primary);
+        font-size: 1rem;
+        transition: all 0.3s ease;
+      }
+
+      .form-control input:focus {
+        outline: none;
+        border-color: var(--accent-primary);
+        box-shadow: 0 0 0 3px rgba(100, 255, 218, 0.1);
+      }
+
+      .form-control input::placeholder {
+        color: var(--text-secondary);
+      }
+
+      .form-control select {
+        padding: 1rem;
+        border: 1px solid rgba(255, 255, 255, 0.2);
+        border-radius: 10px;
+        background: rgba(255, 255, 255, 0.05);
+        backdrop-filter: blur(10px);
+        color: var(--text-primary);
+        font-size: 1rem;
+        transition: all 0.3s ease;
+        cursor: pointer;
+      }
+
+      .form-control select:focus {
+        outline: none;
+        border-color: var(--accent-primary);
+        box-shadow: 0 0 0 3px rgba(100, 255, 218, 0.1);
+      }
+
+      .form-control select option {
+        background: var(--bg-secondary);
+        color: var(--text-primary);
+        padding: 0.5rem;
+      }
+
+      .form-control small {
+        color: var(--text-secondary);
+        font-size: 0.8rem;
+        font-style: italic;
+        margin-top: 0.25rem;
+      }
+
+      .btn-submit {
+        padding: 1rem 2rem;
+        background: var(--primary-gradient);
+        color: white;
+        border: none;
+        border-radius: 10px;
+        font-size: 1rem;
+        font-weight: 600;
+        cursor: pointer;
+        transition: all 0.3s ease;
+        display: flex;
+        align-items: center;
+        justify-content: center;
+        gap: 0.5rem;
+        text-transform: uppercase;
+        letter-spacing: 1px;
+      }
+
+      .btn-submit:hover {
+        transform: translateY(-2px);
+        box-shadow: 0 8px 25px rgba(102, 126, 234, 0.3);
+      }
+
+      .btn-submit:active {
+        transform: translateY(0);
+      }
+
+      /* Footer */
+      .footer {
+        background: rgba(15, 15, 35, 0.9);
+        backdrop-filter: blur(20px);
+        border-top: 1px solid rgba(255, 255, 255, 0.1);
+        padding: 3rem 0 1rem;
+        margin-top: 4rem;
+      }
+
+      .footer-container {
+        max-width: 1200px;
+        margin: 0 auto;
+        padding: 0 2rem;
+        display: grid;
+        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
+        gap: 2rem;
+      }
+
+      .footer-section {
+        display: flex;
+        flex-direction: column;
+        gap: 1rem;
+      }
+
+      .footer-logo {
+        display: flex;
+        align-items: center;
+        gap: 0.5rem;
+        font-size: 1.5rem;
+        font-weight: 700;
+        color: var(--accent-primary);
+        margin-bottom: 0.5rem;
+      }
+
+      .footer-logo i {
+        font-size: 2rem;
+        background: var(--primary-gradient);
+        -webkit-background-clip: text;
+        -webkit-text-fill-color: transparent;
+        background-clip: text;
+      }
+
+      .footer-section p {
+        color: var(--text-secondary);
+        line-height: 1.6;
+      }
+
+      .footer-section h4 {
+        color: var(--text-primary);
+        font-weight: 600;
+        margin-bottom: 0.5rem;
+      }
+
+      .footer-links {
+        list-style: none;
+        display: flex;
+        flex-direction: column;
+        gap: 0.5rem;
+      }
+
+      .footer-links a {
+        color: var(--text-secondary);
+        text-decoration: none;
+        transition: color 0.3s ease;
+      }
+
+      .footer-links a:hover {
+        color: var(--accent-primary);
+      }
+
+      .social-links {
+        display: flex;
+        gap: 1rem;
+      }
+
+      .social-link {
+        display: flex;
+        align-items: center;
+        justify-content: center;
+        width: 40px;
+        height: 40px;
+        background: rgba(255, 255, 255, 0.1);
+        border-radius: 50%;
+        color: var(--text-secondary);
+        text-decoration: none;
+        transition: all 0.3s ease;
+      }
+
+      .social-link:hover {
+        background: var(--accent-primary);
+        color: var(--bg-primary);
+        transform: translateY(-2px);
+      }
+
+      .footer-bottom {
+        border-top: 1px solid rgba(255, 255, 255, 0.1);
+        margin-top: 2rem;
+        padding-top: 1rem;
+      }
+
+      .footer-bottom .footer-container {
+        display: flex;
+        justify-content: space-between;
+        align-items: center;
+        flex-wrap: wrap;
+        gap: 1rem;
+        grid-template-columns: 1fr;
+      }
+
+      .footer-bottom p {
+        color: var(--text-secondary);
+        font-size: 0.9rem;
+      }
+
+      .footer-stats {
+        display: flex;
+        gap: 1rem;
+        flex-wrap: wrap;
+      }
+
+      .footer-stats span {
+        font-size: 0.8rem;
+        color: var(--text-secondary);
+        background: rgba(255, 255, 255, 0.05);
+        padding: 0.25rem 0.75rem;
+        border-radius: 15px;
+      }
+
+      /* Animations */
+      @keyframes fadeInUp {
+        from {
+          opacity: 0;
+          transform: translateY(30px);
+        }
+        to {
+          opacity: 1;
+          transform: translateY(0);
+        }
+      }
+
+      @keyframes slideInLeft {
+        from {
+          opacity: 0;
+          transform: translateX(-20px);
+        }
+        to {
+          opacity: 1;
+          transform: translateX(0);
+        }
+      }
+
+      @keyframes pulse {
+        0%, 100% {
+          transform: scale(1);
+        }
+        50% {
+          transform: scale(1.05);
+        }
+      }
+
+      /* Transaction Display Improvements */
+      .transaction-content {
+        display: flex;
+        flex-direction: column;
+        gap: 0.5rem;
+        flex: 1;
+      }
+
+      .transaction-main {
+        display: flex;
+        justify-content: space-between;
+        align-items: center;
+      }
+
+      .transaction-text {
+        font-weight: 500;
+        color: var(--text-primary);
+      }
+
+      .transaction-amount {
+        font-weight: 600;
+        font-size: 1.1rem;
+      }
+
+      .transaction-date {
+        font-size: 0.8rem;
+        color: var(--text-secondary);
+        opacity: 0.7;
+      }
+
+      .transaction-category {
+        font-size: 0.8rem;
+        color: var(--accent-primary);
+        background: rgba(100, 255, 218, 0.1);
+        padding: 0.2rem 0.6rem;
+        border-radius: 15px;
+        margin-top: 0.25rem;
+        display: inline-block;
+      }
+
+      /* Balance Card States */
+      .balance-card.positive .balance-amount {
+        color: var(--success);
+        text-shadow: 0 0 20px rgba(0, 230, 118, 0.3);
+      }
+
+      .balance-card.negative .balance-amount {
+        color: var(--error);
+        text-shadow: 0 0 20px rgba(255, 87, 34, 0.3);
+      }
+
+      .balance-card.neutral .balance-amount {
+        color: var(--text-secondary);
+        text-shadow: none;
+      }
+
+      /* PWA Install Prompt */
+      .install-prompt {
+        position: fixed;
+        bottom: 20px;
+        left: 20px;
+        right: 20px;
+        z-index: 10000;
+        animation: slideInUp 0.3s ease-out;
+        display: none;
+      }
+
+      .install-prompt-content {
+        background: rgba(15, 15, 35, 0.95);
+        backdrop-filter: blur(20px);
+        border-radius: 15px;
+        border: 1px solid rgba(255, 255, 255, 0.2);
+        padding: 1.5rem;
+        box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
+      }
+
+      .install-prompt-header {
+        display: flex;
+        align-items: center;
+        gap: 0.75rem;
+        margin-bottom: 0.75rem;
+      }
+
+      .install-prompt-header i {
+        color: var(--accent-primary);
+        font-size: 1.5rem;
+      }
+
+      .install-prompt-header h3 {
+        color: var(--text-primary);
+        font-size: 1.1rem;
+        font-weight: 600;
+        margin: 0;
+      }
+
+      .install-prompt p {
+        color: var(--text-secondary);
+        margin-bottom: 1rem;
+        font-size: 0.9rem;
+      }
+
+      .install-prompt-actions {
+        display: flex;
+        gap: 1rem;
+      }
+
+      .install-btn {
+        padding: 0.75rem 1.5rem;
+        background: var(--primary-gradient);
+        color: white;
+        border: none;
+        border-radius: 8px;
+        font-size: 0.9rem;
+        font-weight: 500;
+        cursor: pointer;
+        transition: all 0.3s ease;
+        display: flex;
+        align-items: center;
+        gap: 0.5rem;
+        flex: 1;
+        justify-content: center;
+      }
+
+      .install-btn:hover {
+        transform: translateY(-1px);
+        box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
+      }
+
+      .dismiss-btn {
+        padding: 0.75rem 1.5rem;
+        background: transparent;
+        color: var(--text-secondary);
+        border: 1px solid rgba(255, 255, 255, 0.2);
+        border-radius: 8px;
+        font-size: 0.9rem;
+        font-weight: 500;
+        cursor: pointer;
+        transition: all 0.3s ease;
+        display: flex;
+        align-items: center;
+        gap: 0.5rem;
+        justify-content: center;
+      }
+
+      .dismiss-btn:hover {
+        background: rgba(255, 255, 255, 0.1);
+        color: var(--text-primary);
+      }
+
+      /* Offline Indicator */
+      .offline-indicator {
+        position: fixed;
+        top: 80px;
+        left: 50%;
+        transform: translateX(-50%);
+        background: rgba(255, 152, 0, 0.9);
+        color: white;
+        padding: 0.75rem 1.5rem;
+        border-radius: 25px;
+        font-size: 0.9rem;
+        font-weight: 500;
+        display: flex;
+        align-items: center;
+        gap: 0.5rem;
+        z-index: 9999;
+        backdrop-filter: blur(10px);
+        box-shadow: 0 4px 20px rgba(255, 152, 0, 0.3);
+        animation: slideInDown 0.3s ease-out;
+        display: none;
+      }
+
+      /* Update Notification */
+      .update-notification {
+        position: fixed;
+        top: 20px;
+        right: 20px;
+        z-index: 10000;
+        animation: slideInRight 0.3s ease-out;
+        display: none;
+      }
+
+      .update-content {
+        background: rgba(76, 175, 80, 0.9);
+        color: white;
+        padding: 1rem 1.5rem;
+        border-radius: 10px;
+        display: flex;
+        align-items: center;
+        gap: 1rem;
+        backdrop-filter: blur(10px);
+        box-shadow: 0 4px 20px rgba(76, 175, 80, 0.3);
+      }
+
+      .update-btn {
+        background: white;
+        color: #4CAF50;
+        border: none;
+        padding: 0.5rem 1rem;
+        border-radius: 5px;
+        font-size: 0.9rem;
+        font-weight: 600;
+        cursor: pointer;
+        transition: all 0.3s ease;
+      }
+
+      .update-btn:hover {
+        transform: translateY(-1px);
+        box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
+      }
+
+      /* Animations */
+      @keyframes slideInUp {
+        from {
+          transform: translateY(100%);
+          opacity: 0;
+        }
+        to {
+          transform: translateY(0);
+          opacity: 1;
+        }
+      }
+
+      @keyframes slideInDown {
+        from {
+          transform: translateX(-50%) translateY(-100%);
+          opacity: 0;
+        }
+        to {
+          transform: translateX(-50%) translateY(0);
+          opacity: 1;
+        }
+      }
+
+      @keyframes slideInRight {
+        from {
+          transform: translateX(100%);
+          opacity: 0;
+        }
+        to {
+          transform: translateX(0);
+          opacity: 1;
+        }
+      }
+
+      /* Responsive Design */
+      @media (max-width: 1024px) {
+        .nav-toggle {
+          display: flex;
+        }
+        
+        .nav-menu {
+          position: fixed;
+          top: 0;
+          left: -100%;
+          width: 80%;
+          height: 100vh;
+          background: rgba(15, 15, 35, 0.95);
+          backdrop-filter: blur(20px);
+          flex-direction: column;
+          justify-content: flex-start;
+          align-items: center;
+          padding: 6rem 0 2rem;
+          transition: left 0.3s ease;
+          gap: 0;
+          border-right: 1px solid rgba(255, 255, 255, 0.1);
+        }
+        
+        .nav-menu.active {
+          left: 0;
+        }
+        
+        .nav-link {
+          font-size: 1.2rem;
+          padding: 1rem 2rem;
+          width: 100%;
+          text-align: center;
+          margin: 0.5rem 0;
+        }
+        
+        .user-profile {
+          display: none;
+        }
+        
+        .nav-toggle.active .bar:nth-child(2) {
+          opacity: 0;
+        }
+        
+        .nav-toggle.active .bar:nth-child(1) {
+          transform: translateY(8px) rotate(45deg);
+        }
+        
+        .nav-toggle.active .bar:nth-child(3) {
+          transform: translateY(-8px) rotate(-45deg);
+        }
+      }
+
+      @media (max-width: 768px) {
+        .hero-title {
+          font-size: 2.5rem;
+        }
+        
+        .container {
+          padding: 0 1rem;
+        }
+        
+        .inc-exp-container {
+          flex-direction: column;
+        }
+        
+        .form-row {
+          grid-template-columns: 1fr;
+        }
+        
+        .section-header {
+          flex-direction: column;
+          align-items: stretch;
+        }
+        
+        .footer-bottom .footer-container {
+          flex-direction: column;
+          text-align: center;
+        }
+        
+        .footer-stats {
+          justify-content: center;
+        }
+        
+        .data-actions {
+          grid-template-columns: 1fr;
+          gap: 1.5rem;
+        }
+        
+        .advanced-filters {
+          flex-direction: column;
+          align-items: stretch;
+        }
+        
+        .date-filters,
+        .amount-filters {
+          justify-content: stretch;
+        }
+      }
+
+      @media (max-width: 480px) {
+        .hero-title {
+          font-size: 2rem;
+        }
+        
+        .hero-subtitle {
+          font-size: 1rem;
+        }
+        
+        .balance-amount {
+          font-size: 2rem;
+        }
+        
+        .income-card,
+        .expense-card {
+          flex-direction: column;
+          text-align: center;
+          padding: 1rem;
+        }
+        
+        .card-icon {
+          width: 50px;
+          height: 50px;
+          margin-bottom: 0.5rem;
+        }
+        
+        .nav-container {
+          padding: 0 1rem;
+        }
+        
+        .list li {
+          flex-direction: column;
+          align-items: flex-start;
+          gap: 0.25rem;
+        }
+        
+        .delete-btn {
+          position: relative;
+          left: 0;
+          top: 0;
+          transform: none;
+          margin-top: 0.5rem;
+          opacity: 1;
+          width: 100%;
+          border-radius: 8px;
+          height: 40px;
+        }
+        
+        .date-input,
+        .amount-input,
+        .category-select {
+          width: 100%;
+        }
+      }
+
+      /* Touch and gesture improvements */
+      @media (hover: none) and (pointer: coarse) {
+        .filter-btn,
+        .export-btn,
+        .import-btn,
+        .btn-submit {
+          min-height: 44px;
+          padding: 0.75rem 1.5rem;
+        }
+        
+        .delete-btn {
+          min-width: 44px;
+          min-height: 44px;
+        }
+        
+        .nav-link {
+          padding: 1rem 1.5rem;
+        }
+        
+        .category-select,
+        .date-input,
+        .amount-input,
+        .search-input {
+          min-height: 48px;
+          font-size: 16px;
+        }
+        
+        .form-control input,
+        .form-control select {
+          min-height: 48px;
+          font-size: 16px;
+        }
+      }
+
+      /* Safe area insets for devices with notches */
+      @supports (padding: max(0px)) {
+        .header {
+          padding-left: max(0px, env(safe-area-inset-left));
+          padding-right: max(0px, env(safe-area-inset-right));
+        }
+        
+        .main-content {
+          padding-left: max(2rem, env(safe-area-inset-left) + 2rem);
+          padding-right: max(2rem, env(safe-area-inset-right) + 2rem);
+          padding-bottom: max(2rem, env(safe-area-inset-bottom) + 2rem);
+        }
+        
+        .install-prompt {
+          bottom: max(20px, env(safe-area-inset-bottom) + 20px);
+          left: max(20px, env(safe-area-inset-left) + 20px);
+          right: max(20px, env(safe-area-inset-right) + 20px);
+        }
+      }
+
+      /* Ultra small devices */
+      @media (max-width: 360px) {
+        body {
+          font-size: 14px;
+        }
+        
+        .container {
+          padding: 0 0.75rem;
+        }
+        
+        .hero-title {
+          font-size: 1.4rem;
+          line-height: 1.3;
+        }
+        
+        .hero-subtitle {
+          font-size: 0.85rem;
+        }
+        
+        .balance-card {
+          padding: 1rem;
+        }
+        
+        .balance-amount {
+          font-size: 1.5rem;
+        }
+        
+        .income-card,
+        .expense-card {
+          padding: 0.75rem;
+        }
+        
+        .nav-logo span {
+          font-size: 0.85rem;
+        }
+        
+        .filter-buttons {
+          flex-wrap: wrap;
+          gap: 0.5rem;
+        }
+        
+        .footer-section h4 {
+          font-size: 1rem;
+        }
+        
+        .footer-links a {
+          font-size: 0.85rem;
+        }
+      }
+
+      input,
+      select,
+      button {
+        max-width: 100%;
+        min-width: 0;
+      }
 <head>
   <meta charset="UTF-8">
   <meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=no">
@@ -156,6 +1816,12 @@ <h4>Income</h4>
           <div class="card-icon expense-icon">
             <i class="fas fa-arrow-down"></i>
           </div>
+          <button id="theme-toggle-btn" class="theme-toggle-btn dark-mode" title="Switch to Light Mode">
+            <i class="fas fa-sun"></i>
+          </button>
+          <div class="user-profile">
+            <img src="https://images.unsplash.com/photo-1472099645785-5658abf4ff4e?w=50&h=50&fit=crop&crop=face" alt="User" class="profile-img">
+            <span class="username">John Doe</span>
           <div class="card-content">
             <h4>Expense</h4>
             <p id="money-minus" class="money-minus">
@@ -589,6 +2255,29 @@ <h4>Features</h4>
         </ul>
       </div>
 
+    <button id="scrollToTopBtn" title="Go to top">
+    <i data-lucide="arrow-up-circle"></i>
+  </button>
+    <script src="https://unpkg.com/lucide@latest"></script>
+    <script src="theme.js"></script>
+    <script src="trackerscript.js"></script>
+    
+    <!-- PWA Installation Prompt -->
+    <div id="install-prompt" class="install-prompt" style="display: none;">
+      <div class="install-prompt-content">
+        <div class="install-prompt-header">
+          <i class="fas fa-download"></i>
+          <h3>Install ExpenseFlow</h3>
+        </div>
+        <p>Install ExpenseFlow for quick access and offline functionality!</p>
+        <div class="install-prompt-actions">
+          <button id="install-button" class="install-btn">
+            <i class="fas fa-plus"></i> Install
+          </button>
+          <button id="install-dismiss" class="dismiss-btn">
+            <i class="fas fa-times"></i> Not now
+          </button>
+        </div>
       <div class="footer-section">
         <h4>Resources</h4>
         <ul class="footer-links">
@@ -663,4 +2352,42 @@ <h3>Install ExpenseFlow</h3>
 
 </body>
 
+    <script>
+      // Mobile Navigation Toggle
+      document.addEventListener('DOMContentLoaded', function() {
+        const navToggle = document.getElementById('nav-toggle');
+        const navMenu = document.getElementById('nav-menu');
+        const navLinks = document.querySelectorAll('.nav-link');
+        
+        if (navToggle) {
+          navToggle.addEventListener('click', function() {
+            navToggle.classList.toggle('active');
+            navMenu.classList.toggle('active');
+          });
+        }
+        
+        // Close mobile menu when clicking on a link
+        navLinks.forEach(link => {
+          link.addEventListener('click', () => {
+            navToggle.classList.remove('active');
+            navMenu.classList.remove('active');
+            
+            // Update active state
+            navLinks.forEach(l => l.classList.remove('active'));
+            link.classList.add('active');
+          });
+        });
+        
+        // Close menu when clicking outside
+        document.addEventListener('click', (event) => {
+          const isClickInsideNav = navMenu.contains(event.target) || navToggle.contains(event.target);
+          if (!isClickInsideNav && navMenu.classList.contains('active')) {
+            navToggle.classList.remove('active');
+            navMenu.classList.remove('active');
+          }
+        });
+      });
+    </script>
+  </body>
+</html>
 </html>
diff --git a/theme.js b/theme.js
new file mode 100644
index 0000000..342dd2a
--- /dev/null
+++ b/theme.js
@@ -0,0 +1,96 @@
+// Theme Toggle Functionality
+class ThemeManager {
+  constructor() {
+    this.STORAGE_KEY = 'expenseflow-theme';
+    this.LIGHT_THEME = 'light';
+    this.DARK_THEME = 'dark';
+    this.init();
+  }
+
+  init() {
+    // Check if DOM is already loaded (likely since script is at end of body)
+    if (document.readyState === 'loading') {
+      document.addEventListener('DOMContentLoaded', () => {
+        this.restoreTheme();
+        this.setupThemeToggle();
+      });
+    } else {
+      // DOM is already loaded, initialize immediately
+      this.restoreTheme();
+      this.setupThemeToggle();
+    }
+  }
+
+  getStoredTheme() {
+    return localStorage.getItem(this.STORAGE_KEY);
+  }
+
+  setStoredTheme(theme) {
+    localStorage.setItem(this.STORAGE_KEY, theme);
+  }
+
+  getPreferredTheme() {
+    const stored = this.getStoredTheme();
+    if (stored) {
+      return stored;
+    }
+
+    // Check system preference
+    if (window.matchMedia && window.matchMedia('(prefers-color-scheme: light)').matches) {
+      return this.LIGHT_THEME;
+    }
+
+    return this.DARK_THEME;
+  }
+
+  applyTheme(theme) {
+    const html = document.documentElement;
+    
+    if (theme === this.LIGHT_THEME) {
+      html.setAttribute('data-theme', this.LIGHT_THEME);
+    } else {
+      html.setAttribute('data-theme', this.DARK_THEME);
+    }
+
+    this.setStoredTheme(theme);
+    this.updateToggleButton(theme);
+  }
+
+  restoreTheme() {
+    const theme = this.getPreferredTheme();
+    this.applyTheme(theme);
+  }
+
+  toggleTheme() {
+    const currentTheme = document.documentElement.getAttribute('data-theme') || this.DARK_THEME;
+    const newTheme = currentTheme === this.LIGHT_THEME ? this.DARK_THEME : this.LIGHT_THEME;
+    this.applyTheme(newTheme);
+  }
+
+  updateToggleButton(theme) {
+    const button = document.getElementById('theme-toggle-btn');
+    if (button) {
+      if (theme === this.LIGHT_THEME) {
+        button.classList.add('light-mode');
+        button.classList.remove('dark-mode');
+        button.title = 'Switch to Dark Mode';
+        button.innerHTML = '<i class="fas fa-moon"></i>';
+      } else {
+        button.classList.add('dark-mode');
+        button.classList.remove('light-mode');
+        button.title = 'Switch to Light Mode';
+        button.innerHTML = '<i class="fas fa-sun"></i>';
+      }
+    }
+  }
+
+  setupThemeToggle() {
+    const button = document.getElementById('theme-toggle-btn');
+    if (button) {
+      button.addEventListener('click', () => this.toggleTheme());
+    }
+  }
+}
+
+// Initialize theme manager
+const themeManager = new ThemeManager();
