diff --git a/assets/css/custom.css b/assets/css/custom.css
new file mode 100644
index 0000000..d6e6929
--- /dev/null
+++ b/assets/css/custom.css
@@ -0,0 +1,67 @@
+body {
+    font-family: 'Inter', sans-serif;
+    background-color: #F8F9FA;
+}
+
+.main-container {
+    display: flex;
+    padding-top: 56px; /* Height of navbar */
+    height: 100vh;
+}
+
+.sidebar {
+    width: 280px;
+    flex-shrink: 0;
+    transition: width 0.3s ease;
+}
+
+.main-content {
+    flex-grow: 1;
+    overflow-y: auto;
+}
+
+.navbar-brand {
+    letter-spacing: -0.5px;
+}
+
+.btn {
+    border-radius: 0.375rem;
+    font-weight: 500;
+    padding: 0.5rem 1rem;
+}
+
+.btn-primary {
+    background: linear-gradient(145deg, #0D6EFD, #0A58CA);
+    border: none;
+    transition: transform 0.2s ease;
+}
+
+.btn-primary:hover {
+    transform: translateY(-2px);
+    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
+}
+
+.content-placeholder {
+    border: 2px dashed #e0e0e0;
+}
+
+.sidebar .list-group-item {
+    background-color: transparent;
+    border: none;
+    font-weight: 500;
+    color: #495057;
+    padding: 0.75rem 0;
+}
+
+.sidebar .list-group-item i {
+    margin-right: 10px;
+    color: #6C757D;
+}
+
+.sidebar .list-group-item:hover {
+    color: #0D6EFD;
+}
+
+.sidebar .list-group-item:hover i {
+    color: #0D6EFD;
+}
diff --git a/assets/js/main.js b/assets/js/main.js
new file mode 100644
index 0000000..1704573
--- /dev/null
+++ b/assets/js/main.js
@@ -0,0 +1,69 @@
+document.addEventListener('DOMContentLoaded', function () {
+    const templates = {
+        'Kotlin': {
+            name: 'Kotlin App',
+            tools: [
+                { name: 'Project', icon: 'bi-folder' },
+                { name: 'Dependencies', icon: 'bi-puzzle' },
+                { name: 'Build Variants', icon: 'bi-toggles' },
+                { name: 'Signing', icon: 'bi-pen' }
+            ]
+        },
+        'Java': {
+            name: 'Java App',
+            tools: [
+                { name: 'Project', icon: 'bi-folder' },
+                { name: 'Dependencies', icon: 'bi-puzzle' },
+                { name: 'Manifest', icon: 'bi-file-earmark-code' },
+                { name: 'Build Config', icon: 'bi-gear' }
+            ]
+        },
+        'Empty': {
+            name: 'Empty Activity',
+            tools: [
+                { name: 'Layout', icon: 'bi-layout-split' },
+                { name: 'Code', icon: 'bi-file-code' },
+                { name: 'Resources', icon: 'bi-archive' }
+            ]
+        }
+    };
+
+    const templateLinks = document.querySelectorAll('.template-select');
+    const toolsList = document.getElementById('tools-list');
+    const projectTitle = document.getElementById('project-title');
+    const contentPlaceholder = document.querySelector('.content-placeholder');
+    const syncBtn = document.getElementById('sync-btn');
+
+    templateLinks.forEach(link => {
+        link.addEventListener('click', function (e) {
+            e.preventDefault();
+            const templateKey = this.getAttribute('data-template');
+            const selectedTemplate = templates[templateKey];
+
+            if (selectedTemplate) {
+                // Update project title
+                projectTitle.textContent = selectedTemplate.name;
+
+                // Update tools sidebar
+                toolsList.innerHTML = ''; // Clear existing tools
+                selectedTemplate.tools.forEach(tool => {
+                    const toolItem = document.createElement('a');
+                    toolItem.href = '#';
+                    toolItem.className = 'list-group-item list-group-item-action';
+                    toolItem.innerHTML = `<i class="bi ${tool.icon}"></i> ${tool.name}`;
+                    toolsList.appendChild(toolItem);
+                });
+
+                // Update main content placeholder
+                contentPlaceholder.innerHTML = `
+                    <i class="bi bi-check-circle-fill display-1 text-success"></i>
+                    <p class="mt-3 fs-5">Template <span class="fw-bold">${selectedTemplate.name}</span> loaded.</p>
+                    <p class="text-muted">You can now sync your project.</p>
+                `;
+
+                // Enable Sync button
+                syncBtn.disabled = false;
+            }
+        });
+    });
+});
diff --git a/index.php b/index.php
index 7205f3d..134ae11 100644
--- a/index.php
+++ b/index.php
@@ -1,150 +1,83 @@
-<?php
-declare(strict_types=1);
-@ini_set('display_errors', '1');
-@error_reporting(E_ALL);
-@date_default_timezone_set('UTC');
-
-$phpVersion = PHP_VERSION;
-$now = date('Y-m-d H:i:s');
-?>
-<!doctype html>
+<!DOCTYPE html>
 <html lang="en">
 <head>
-  <meta charset="utf-8" />
-  <meta name="viewport" content="width=device-width, initial-scale=1" />
-  <title>New Style</title>
-<?php
-// Read project preview data from environment
-$projectDescription = $_SERVER['PROJECT_DESCRIPTION'] ?? '';
-$projectImageUrl = $_SERVER['PROJECT_IMAGE_URL'] ?? '';
-?>
-<?php if ($projectDescription): ?>
-  <!-- Meta description -->
-  <meta name="description" content='<?= htmlspecialchars($projectDescription) ?>' />
-  <!-- Open Graph meta tags -->
-  <meta property="og:description" content="<?= htmlspecialchars($projectDescription) ?>" />
-  <!-- Twitter meta tags -->
-  <meta property="twitter:description" content="<?= htmlspecialchars($projectDescription) ?>" />
-<?php endif; ?>
-<?php if ($projectImageUrl): ?>
-  <!-- Open Graph image -->
-  <meta property="og:image" content="<?= htmlspecialchars($projectImageUrl) ?>" />
-  <!-- Twitter image -->
-  <meta property="twitter:image" content="<?= htmlspecialchars($projectImageUrl) ?>" />
-<?php endif; ?>
-  <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@400;700&display=swap" rel="stylesheet">
-  <style>
-    :root {
-      --bg-color-start: #6a11cb;
-      --bg-color-end: #2575fc;
-      --text-color: #ffffff;
-      --card-bg-color: rgba(255, 255, 255, 0.01);
-      --card-border-color: rgba(255, 255, 255, 0.1);
-    }
-    body {
-      margin: 0;
-      font-family: 'Inter', sans-serif;
-      background: linear-gradient(45deg, var(--bg-color-start), var(--bg-color-end));
-      color: var(--text-color);
-      display: flex;
-      justify-content: center;
-      align-items: center;
-      min-height: 100vh;
-      text-align: center;
-      overflow: hidden;
-      position: relative;
-    }
-    body::before {
-      content: '';
-      position: absolute;
-      top: 0;
-      left: 0;
-      width: 100%;
-      height: 100%;
-      background-image: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" width="100" height="100" viewBox="0 0 100 100"><path d="M-10 10L110 10M10 -10L10 110" stroke-width="1" stroke="rgba(255,255,255,0.05)"/></svg>');
-      animation: bg-pan 20s linear infinite;
-      z-index: -1;
-    }
-    @keyframes bg-pan {
-      0% { background-position: 0% 0%; }
-      100% { background-position: 100% 100%; }
-    }
-    main {
-      padding: 2rem;
-    }
-    .card {
-      background: var(--card-bg-color);
-      border: 1px solid var(--card-border-color);
-      border-radius: 16px;
-      padding: 2rem;
-      backdrop-filter: blur(20px);
-      -webkit-backdrop-filter: blur(20px);
-      box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.1);
-    }
-    .loader {
-      margin: 1.25rem auto 1.25rem;
-      width: 48px;
-      height: 48px;
-      border: 3px solid rgba(255, 255, 255, 0.25);
-      border-top-color: #fff;
-      border-radius: 50%;
-      animation: spin 1s linear infinite;
-    }
-    @keyframes spin {
-      from { transform: rotate(0deg); }
-      to   { transform: rotate(360deg); }
-    }
-    .hint {
-      opacity: 0.9;
-    }
-    .sr-only {
-      position: absolute;
-      width: 1px; height: 1px;
-      padding: 0; margin: -1px;
-      overflow: hidden;
-      clip: rect(0, 0, 0, 0);
-      white-space: nowrap; border: 0;
-    }
-    h1 {
-      font-size: 3rem;
-      font-weight: 700;
-      margin: 0 0 1rem;
-      letter-spacing: -1px;
-    }
-    p {
-      margin: 0.5rem 0;
-      font-size: 1.1rem;
-    }
-    code {
-      background: rgba(0,0,0,0.2);
-      padding: 2px 6px;
-      border-radius: 4px;
-      font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
-    }
-    footer {
-      position: absolute;
-      bottom: 1rem;
-      font-size: 0.8rem;
-      opacity: 0.7;
-    }
-  </style>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <!-- SEO Meta Tags -->
+    <title>APK Builder</title>
+    <meta name="description" content="Create and build your Android applications online with a variety of templates.">
+    <meta name="keywords" content="apk builder, android development, kotlin, java, mobile app builder, online ide, build apk, flatlogic generator">
+    <meta property="og:title" content="APK Builder">
+    <meta property="og:description" content="Create and build your Android applications online with a variety of templates.">
+    <meta property="og:image" content="">
+    <meta name="twitter:card" content="summary_large_image">
+    <meta name="twitter:image" content="">
+
+    <!-- Bootstrap CSS -->
+    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.2/dist/css/bootstrap.min.css" rel="stylesheet">
+    <!-- Bootstrap Icons -->
+    <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap-icons@1.11.1/font/bootstrap-icons.css">
+    <!-- Google Fonts (Inter) -->
+    <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@400;500;600;700&display=swap" rel="stylesheet">
+    <!-- Custom CSS -->
+    <link rel="stylesheet" href="assets/css/custom.css?v=<?php echo time(); ?>">
 </head>
 <body>
-  <main>
-    <div class="card">
-      <h1>Analyzing your requirements and generating your website…</h1>
-      <div class="loader" role="status" aria-live="polite" aria-label="Applying initial changes">
-        <span class="sr-only">Loading…</span>
-      </div>
-      <p class="hint"><?= ($_SERVER['HTTP_HOST'] ?? '') === 'appwizzy.com' ? 'AppWizzy' : 'Flatlogic' ?> AI is collecting your requirements and applying the first changes.</p>
-      <p class="hint">This page will update automatically as the plan is implemented.</p>
-      <p>Runtime: PHP <code><?= htmlspecialchars($phpVersion) ?></code> — UTC <code><?= htmlspecialchars($now) ?></code></p>
+
+    <header class="navbar navbar-expand-lg navbar-dark bg-dark fixed-top">
+        <div class="container-fluid">
+            <a class="navbar-brand fw-bold" href="#"><i class="bi bi-box-seam"></i> APK Builder</a>
+            <button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navbarNav" aria-controls="navbarNav" aria-expanded="false" aria-label="Toggle navigation">
+                <span class="navbar-toggler-icon"></span>
+            </button>
+            <div class="collapse navbar-collapse" id="navbarNav">
+                <ul class="navbar-nav ms-auto">
+                    <li class="nav-item dropdown">
+                        <a class="nav-link dropdown-toggle" href="#" id="templatesDropdown" role="button" data-bs-toggle="dropdown" aria-expanded="false">
+                            <i class="bi bi-grid-1x2"></i> Templates
+                        </a>
+                        <ul class="dropdown-menu dropdown-menu-end" aria-labelledby="templatesDropdown">
+                            <li><a class="dropdown-item template-select" href="#" data-template="Kotlin">Kotlin App</a></li>
+                            <li><a class="dropdown-item template-select" href="#" data-template="Java">Java App</a></li>
+                            <li><a class="dropdown-item template-select" href="#" data-template="Empty">Empty Activity</a></li>
+                        </ul>
+                    </li>
+                </ul>
+            </div>
+        </div>
+    </header>
+
+    <div class="main-container">
+        <aside class="sidebar bg-light border-end" id="sidebar">
+            <div class="sidebar-header p-3 border-bottom">
+                <h5 class="mb-0"><i class="bi bi-tools"></i> Tools</h5>
+            </div>
+            <div class="list-group list-group-flush p-3" id="tools-list">
+                <span class="text-muted">Select a template to see tools.</span>
+            </div>
+        </aside>
+
+        <main class="main-content p-4" id="main-content">
+            <div class="d-flex justify-content-between align-items-center mb-4">
+                <h1 id="project-title" class="h3">Welcome</h1>
+                <div class="d-flex gap-2">
+                    <button id="sync-btn" class="btn btn-primary" disabled><i class="bi bi-arrow-repeat"></i> Sync</button>
+                    <button id="build-btn" class="btn btn-success" disabled><i class="bi bi-hammer"></i> Build APK</button>
+                    <button id="download-btn" class="btn btn-secondary" disabled><i class="bi bi-download"></i> Download</button>
+                </div>
+            </div>
+            <div class="content-placeholder bg-white p-5 rounded shadow-sm text-center">
+                <i class="bi bi-code-slash display-1 text-light"></i>
+                <p class="mt-3 text-muted">Please select a template from the top-right menu to begin.</p>
+            </div>
+        </main>
     </div>
-  </main>
-  <footer>
-    Page updated: <?= htmlspecialchars($now) ?> (UTC)
-  </footer>
+
+    <!-- Bootstrap JS Bundle -->
+    <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.2/dist/js/bootstrap.bundle.min.js"></script>
+    <!-- Custom JS -->
+    <script src="assets/js/main.js?v=<?php echo time(); ?>"></script>
 </body>
-</html>
+</html>
\ No newline at end of file