diff --git a/assets/css/custom.css b/assets/css/custom.css
new file mode 100644
index 0000000..970a2ee
--- /dev/null
+++ b/assets/css/custom.css
@@ -0,0 +1,169 @@
+:root {
+    --primary: #3b82f6;
+    --primary-hover: #2563eb;
+    --secondary: #64748b;
+    --success: #10b981;
+    --danger: #ef4444;
+    --warning: #f59e0b;
+    --background: #f8fafc;
+    --surface: #ffffff;
+    --border: #e2e8f0;
+    --text-main: #0f172a;
+    --text-muted: #64748b;
+    --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
+    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
+}
+
+body {
+    font-family: 'Inter', system-ui, -apple-system, sans-serif;
+    color: var(--text-main);
+    background-color: var(--background);
+}
+
+/* Scrollbar */
+::-webkit-scrollbar {
+    width: 6px;
+}
+::-webkit-scrollbar-track {
+    background: transparent;
+}
+::-webkit-scrollbar-thumb {
+    background: #cbd5e1;
+    border-radius: 10px;
+}
+::-webkit-scrollbar-thumb:hover {
+    background: #94a3b8;
+}
+
+/* Login Components */
+.login-card {
+    background: var(--surface);
+    border-radius: 16px;
+    border: 1px solid var(--border);
+    box-shadow: var(--shadow-lg);
+}
+
+.hospital-logo {
+    display: flex;
+    align-items: center;
+    color: var(--primary);
+}
+
+.logo-icon {
+    background: rgba(59, 130, 246, 0.1);
+    color: var(--primary);
+    padding: 10px;
+    border-radius: 12px;
+}
+
+.form-control {
+    border-radius: 10px;
+    border: 1px solid var(--border);
+    padding: 10px 14px;
+    font-size: 14px;
+    transition: all 0.2s;
+}
+
+.form-control:focus {
+    border-color: var(--primary);
+    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.1);
+}
+
+.btn-primary {
+    background-color: var(--primary);
+    border-color: var(--primary);
+    border-radius: 10px;
+    padding: 10px 20px;
+    transition: all 0.2s;
+}
+
+.btn-primary:hover {
+    background-color: var(--primary-hover);
+    border-color: var(--primary-hover);
+    transform: translateY(-1px);
+    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.2);
+}
+
+/* Dashboard Layout */
+.dashboard-layout {
+    display: flex;
+    height: 100vh;
+    overflow: hidden;
+}
+
+.sidebar {
+    width: 280px;
+    background: #f1f5f9;
+    border-right: 1px solid var(--border);
+    flex-shrink: 0;
+}
+
+.main-content {
+    flex-grow: 1;
+    background: var(--surface);
+}
+
+.main-header {
+    height: 72px;
+}
+
+.sidebar-header {
+    height: 72px;
+}
+
+.list-group-item {
+    border: none;
+    background: transparent;
+    color: var(--text-muted);
+    font-size: 14px;
+    margin-bottom: 2px;
+}
+
+.list-group-item:hover {
+    background: rgba(0, 0, 0, 0.03);
+    color: var(--text-main);
+}
+
+.list-group-item.active {
+    background: var(--primary) !important;
+    color: white !important;
+}
+
+/* Roles */
+.role-badge {
+    padding: 2px 8px;
+    border-radius: 6px;
+    font-size: 10px;
+    font-weight: 600;
+    text-transform: uppercase;
+}
+
+.role-doctor { background: #e0f2fe; color: #0369a1; }
+.role-nurse { background: #f0fdf4; color: #15803d; }
+.role-admin_staff { background: #fef2f2; color: #b91c1c; }
+
+/* Utilities */
+.no-caret::after {
+    display: none;
+}
+
+.demo-btn {
+    font-size: 12px !important;
+    font-weight: 500;
+    border-radius: 8px;
+}
+
+.demo-btn:hover {
+    background-color: #f8fafc !important;
+    border-color: #cbd5e1 !important;
+}
+
+.uppercase {
+    text-transform: uppercase;
+}
+
+@media (max-width: 768px) {
+    .sidebar {
+        display: none;
+    }
+}
diff --git a/assets/js/main.js b/assets/js/main.js
new file mode 100644
index 0000000..8029235
--- /dev/null
+++ b/assets/js/main.js
@@ -0,0 +1,60 @@
+document.addEventListener('DOMContentLoaded', function() {
+    const loginForm = document.getElementById('loginForm');
+    const loginAlert = document.getElementById('loginAlert');
+    const demoBtns = document.querySelectorAll('.demo-btn');
+
+    // Handle Demo Buttons
+    demoBtns.forEach(btn => {
+        btn.addEventListener('click', function() {
+            const email = this.getAttribute('data-email');
+            const pass = this.getAttribute('data-pass');
+            
+            const emailInput = document.getElementById('email');
+            const passInput = document.getElementById('password');
+            
+            if (emailInput && passInput) {
+                emailInput.value = email;
+                passInput.value = pass;
+                // Auto submit
+                loginForm.dispatchEvent(new Event('submit'));
+            }
+        });
+    });
+
+    if (loginForm) {
+        loginForm.addEventListener('submit', function(e) {
+            e.preventDefault();
+            
+            const formData = new FormData(loginForm);
+            formData.append('action', 'login');
+
+            const submitBtn = loginForm.querySelector('button[type="submit"]');
+            const originalText = submitBtn.innerText;
+            submitBtn.disabled = true;
+            submitBtn.innerHTML = '<span class="spinner-border spinner-border-sm me-2"></span>Authenticating...';
+
+            fetch('auth.php', {
+                method: 'POST',
+                body: formData
+            })
+            .then(response => response.json())
+            .then(data => {
+                if (data.success) {
+                    window.location.reload();
+                } else {
+                    loginAlert.innerText = data.error;
+                    loginAlert.classList.remove('d-none');
+                    submitBtn.disabled = false;
+                    submitBtn.innerText = originalText;
+                }
+            })
+            .catch(error => {
+                console.error('Error:', error);
+                loginAlert.innerText = 'Clinical gateway error. Please try again.';
+                loginAlert.classList.remove('d-none');
+                submitBtn.disabled = false;
+                submitBtn.innerText = originalText;
+            });
+        });
+    }
+});
\ No newline at end of file
diff --git a/auth.php b/auth.php
new file mode 100644
index 0000000..372a818
--- /dev/null
+++ b/auth.php
@@ -0,0 +1,60 @@
+<?php
+session_start();
+require_once __DIR__ . '/db/config.php';
+
+function login($email, $password) {
+    try {
+        $stmt = db()->prepare("SELECT * FROM users WHERE email = ?");
+        $stmt->execute([$email]);
+        $user = $stmt->fetch();
+
+        if ($user && password_verify($password, $user['password'])) {
+            $_SESSION['user_id'] = $user['id'];
+            $_SESSION['hospital_id'] = $user['hospital_id'];
+            $_SESSION['user_name'] = $user['name'];
+            $_SESSION['user_role'] = $user['role'];
+            
+            // Set online status
+            $update = db()->prepare("UPDATE users SET online_status = 1 WHERE id = ?");
+            $update->execute([$user['id']]);
+            
+            return ['success' => true, 'user' => $user];
+        } else {
+            return ['success' => false, 'error' => 'Invalid email or password.'];
+        }
+    } catch (PDOException $e) {
+        return ['success' => false, 'error' => 'System error. Please try again later.'];
+    }
+}
+
+function logout() {
+    if (isset($_SESSION['user_id'])) {
+        try {
+            $update = db()->prepare("UPDATE users SET online_status = 0 WHERE id = ?");
+            $update->execute([$_SESSION['user_id']]);
+        } catch (PDOException $e) {
+            // Log error but continue logout
+        }
+    }
+    session_destroy();
+    header("Location: index.php");
+    exit;
+}
+
+// Handle POST requests
+if ($_SERVER['REQUEST_METHOD'] === 'POST') {
+    header('Content-Type: application/json');
+    $action = $_POST['action'] ?? '';
+
+    if ($action === 'login') {
+        $email = trim($_POST['email'] ?? '');
+        $password = $_POST['password'] ?? '';
+        $result = login($email, $password);
+        echo json_encode($result);
+        exit;
+    }
+}
+
+if (isset($_GET['action']) && $_GET['action'] === 'logout') {
+    logout();
+}
\ No newline at end of file
diff --git a/db/schema.sql b/db/schema.sql
new file mode 100644
index 0000000..825a3be
--- /dev/null
+++ b/db/schema.sql
@@ -0,0 +1,21 @@
+-- Hospital Internal Chat Schema
+CREATE TABLE IF NOT EXISTS users (
+    id INT AUTO_INCREMENT PRIMARY KEY,
+    hospital_id VARCHAR(50) NOT NULL UNIQUE,
+    email VARCHAR(100) NOT NULL UNIQUE,
+    password VARCHAR(255) NOT NULL,
+    name VARCHAR(100) NOT NULL,
+    role ENUM('doctor', 'nurse', 'admin_staff', 'technician', 'pharmacist') NOT NULL,
+    department VARCHAR(100),
+    online_status BOOLEAN DEFAULT FALSE,
+    last_seen TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
+    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+);
+
+-- Seed data for testing (password is 'password' for all)
+INSERT IGNORE INTO users (hospital_id, email, password, name, role, department) VALUES
+('DOC001', 'sarah.mitchell@medlink.com', '$2y$10$92IXUNpkjO0rOQ5byMi.Ye4oKoEa3Ro9llC/.og/at2.uheWG/igi', 'Dr. Sarah Mitchell', 'doctor', 'Cardiology'),
+('NUR002', 'james.wilson@medlink.com', '$2y$10$92IXUNpkjO0rOQ5byMi.Ye4oKoEa3Ro9llC/.og/at2.uheWG/igi', 'James Wilson, RN', 'nurse', 'Emergency'),
+('ADM003', 'elena.rodriguez@medlink.com', '$2y$10$92IXUNpkjO0rOQ5byMi.Ye4oKoEa3Ro9llC/.og/at2.uheWG/igi', 'Elena Rodriguez', 'admin_staff', 'Operations'),
+('LAB004', 'david.chen@medlink.com', '$2y$10$92IXUNpkjO0rOQ5byMi.Ye4oKoEa3Ro9llC/.og/at2.uheWG/igi', 'David Chen', 'technician', 'Pathology'),
+('PHM005', 'anita.gupta@medlink.com', '$2y$10$92IXUNpkjO0rOQ5byMi.Ye4oKoEa3Ro9llC/.og/at2.uheWG/igi', 'Dr. Anita Gupta', 'pharmacist', 'Pharmacy');
\ No newline at end of file
diff --git a/index.php b/index.php
index 7205f3d..204e5f1 100644
--- a/index.php
+++ b/index.php
@@ -1,150 +1,170 @@
 <?php
-declare(strict_types=1);
-@ini_set('display_errors', '1');
-@error_reporting(E_ALL);
-@date_default_timezone_set('UTC');
-
-$phpVersion = PHP_VERSION;
-$now = date('Y-m-d H:i:s');
+session_start();
+$isLoggedIn = isset($_SESSION['user_id']);
 ?>
-<!doctype html>
+<!DOCTYPE html>
 <html lang="en">
 <head>
-  <meta charset="utf-8" />
-  <meta name="viewport" content="width=device-width, initial-scale=1" />
-  <title>New Style</title>
-<?php
-// Read project preview data from environment
-$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">
+    <title><?php echo $_SERVER['PROJECT_NAME'] ?? 'MedicalLink'; ?> - Secure Clinical Chat</title>
+    <meta name="description" content="Secure internal communication for healthcare professionals.">
+    
+    <!-- Bootstrap 5 CDN -->
+    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0/dist/css/bootstrap.min.css" rel="stylesheet">
+    <!-- Custom CSS -->
+    <link rel="stylesheet" href="assets/css/custom.css?v=<?php echo time(); ?>">
+    <!-- Inter Font -->
+    <link href="https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600&display=swap" rel="stylesheet">
 </head>
-<body>
-  <main>
-    <div class="card">
-      <h1>Analyzing your requirements and generating your website…</h1>
-      <div class="loader" role="status" aria-live="polite" aria-label="Applying initial changes">
-        <span class="sr-only">Loading…</span>
-      </div>
-      <p class="hint"><?= ($_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>
+<body class="<?php echo $isLoggedIn ? 'bg-white' : 'bg-light'; ?>">
+
+<?php if (!$isLoggedIn): ?>
+    <div class="container">
+        <div class="row min-vh-100 align-items-center justify-content-center py-5">
+            <div class="col-12 col-md-8 col-lg-5">
+                <div class="login-card p-4 p-md-5">
+                    <div class="hospital-logo mb-4">
+                        <div class="logo-icon">
+                            <svg xmlns="http://www.w3.org/2000/svg" width="28" height="28" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round"><path d="M19 14c1.49-1.46 3-3.21 3-5.5A5.5 5.5 0 0 0 16.5 3c-1.76 0-3 .5-4.5 2-1.5-1.5-2.74-2-4.5-2A5.5 5.5 0 0 0 2 8.5c0 2.3 1.5 4.05 3 5.5l7 7Z"/></svg>
+                        </div>
+                        <span class="ms-2 h4 mb-0 fw-bold">MedicalLink</span>
+                    </div>
+                    
+                    <h2 class="h4 mb-1 fw-bold">Clinical Access</h2>
+                    <p class="text-muted small mb-4">Sign in with your clinical credentials.</p>
+
+                    <div id="loginAlert" class="alert alert-danger d-none"></div>
+
+                    <form id="loginForm">
+                        <div class="mb-3">
+                            <label for="email" class="form-label small fw-semibold">Clinical Email</label>
+                            <input type="email" class="form-control" id="email" name="email" placeholder="name@medlink.com" required>
+                        </div>
+                        <div class="mb-4">
+                            <div class="d-flex justify-content-between">
+                                <label for="password" class="form-label small fw-semibold">Password</label>
+                                <a href="#" class="small text-decoration-none">Forgot?</a>
+                            </div>
+                            <input type="password" class="form-control" id="password" name="password" placeholder="••••••••" required>
+                        </div>
+                        <button type="submit" class="btn btn-primary w-100 py-2 fw-semibold">Sign In</button>
+                    </form>
+                    
+                    <div class="mt-5">
+                        <div class="d-flex align-items-center mb-3">
+                            <hr class="flex-grow-1 text-muted opacity-25">
+                            <span class="mx-3 text-muted small fw-medium uppercase">Demo Accounts</span>
+                            <hr class="flex-grow-1 text-muted opacity-25">
+                        </div>
+                        <div class="row g-2" id="demoAccounts">
+                            <div class="col-6">
+                                <button class="btn btn-outline-light text-dark border w-100 py-2 small demo-btn" 
+                                        data-email="sarah.mitchell@medlink.com" data-pass="password">
+                                    Dr. Mitchell
+                                </button>
+                            </div>
+                            <div class="col-6">
+                                <button class="btn btn-outline-light text-dark border w-100 py-2 small demo-btn" 
+                                        data-email="james.wilson@medlink.com" data-pass="password">
+                                    Nurse Wilson
+                                </button>
+                            </div>
+                        </div>
+                    </div>
+                </div>
+            </div>
+        </div>
     </div>
-  </main>
-  <footer>
-    Page updated: <?= htmlspecialchars($now) ?> (UTC)
-  </footer>
+<?php else: ?>
+    <div class="dashboard-layout">
+        <aside class="sidebar">
+            <div class="sidebar-header p-3 border-bottom d-flex align-items-center justify-content-between">
+                <div class="hospital-logo mb-0">
+                    <svg xmlns="http://www.w3.org/2000/svg" width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M19 14c1.49-1.46 3-3.21 3-5.5A5.5 5.5 0 0 0 16.5 3c-1.76 0-3 .5-4.5 2-1.5-1.5-2.74-2-4.5-2A5.5 5.5 0 0 0 2 8.5c0 2.3 1.5 4.05 3 5.5l7 7Z"/></svg>
+                    <span class="fw-bold ms-1">MedicalLink</span>
+                </div>
+            </div>
+            <div class="p-3">
+                <div class="text-muted small mb-3 text-uppercase fw-bold" style="font-size: 10px; letter-spacing: 0.05em;">Channels & Staff</div>
+                <div class="list-group list-group-flush gap-1">
+                    <a href="#" class="list-group-item list-group-item-action rounded border-0 py-2 px-3 active">
+                        <span class="small fw-medium"># General Ward</span>
+                    </a>
+                    <a href="#" class="list-group-item list-group-item-action rounded border-0 py-2 px-3">
+                        <span class="small fw-medium"># Emergency Room</span>
+                    </a>
+                </div>
+            </div>
+        </aside>
+        
+        <main class="main-content d-flex flex-column">
+            <header class="main-header p-3 border-bottom d-flex align-items-center justify-content-between bg-white sticky-top">
+                <div class="d-flex align-items-center gap-2">
+                    <div class="bg-primary bg-opacity-10 text-primary rounded-circle p-2 d-flex align-items-center justify-content-center" style="width: 36px; height: 36px;">
+                        <svg xmlns="http://www.w3.org/2000/svg" width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M17 21v-2a4 4 0 0 0-4-4H5a4 4 0 0 0-4 4v2"></path><circle cx="9" cy="7" r="4"></circle><path d="M23 21v-2a4 4 0 0 0-3-3.87"></path><path d="M16 3.13a4 4 0 0 1 0 7.75"></path></svg>
+                    </div>
+                    <div>
+                        <h6 class="mb-0 fw-bold">General Ward</h6>
+                        <span class="text-success small d-flex align-items-center gap-1">
+                            <span class="bg-success rounded-circle" style="width: 6px; height: 6px;"></span>
+                            12 Active Staff
+                        </span>
+                    </div>
+                </div>
+                
+                <div class="d-flex align-items-center gap-3">
+                    <div class="text-end d-none d-sm-block">
+                        <div class="fw-bold small"><?php echo htmlspecialchars($_SESSION['user_name']); ?></div>
+                        <div class="text-muted" style="font-size: 11px;"><?php echo ucwords(str_replace('_', ' ', $_SESSION['user_role'])); ?></div>
+                    </div>
+                    <div class="dropdown">
+                        <button class="btn btn-link p-0 text-dark dropdown-toggle no-caret" data-bs-toggle="dropdown">
+                            <div class="bg-light rounded-circle border d-flex align-items-center justify-content-center fw-bold text-primary" style="width: 36px; height: 36px; font-size: 14px;">
+                                <?php 
+                                    $names = explode(' ', $_SESSION['user_name']);
+                                    echo strtoupper(substr($names[0], 0, 1) . (isset($names[1]) ? substr($names[1], 0, 1) : ''));
+                                ?>
+                            </div>
+                        </button>
+                        <ul class="dropdown-menu dropdown-menu-end shadow-sm border-0">
+                            <li><a class="dropdown-item py-2 small" href="#"><svg class="me-2" xmlns="http://www.w3.org/2000/svg" width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M20 21v-2a4 4 0 0 0-4-4H8a4 4 0 0 0-4 4v2"></path><circle cx="12" cy="7" r="4"></circle></svg> Profile</a></li>
+                            <li><hr class="dropdown-divider opacity-50"></li>
+                            <li><a class="dropdown-item py-2 small text-danger" href="auth.php?action=logout"><svg class="me-2" xmlns="http://www.w3.org/2000/svg" width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M9 21H5a2 2 0 0 1-2-2V5a2 2 0 0 1 2-2h4"></path><polyline points="16 17 21 12 16 7"></polyline><line x1="21" y1="12" x2="9" y2="12"></line></svg> Sign Out</a></li>
+                        </ul>
+                    </div>
+                </div>
+            </header>
+            
+            <div class="flex-grow-1 overflow-auto p-4 d-flex align-items-center justify-content-center bg-light bg-opacity-50">
+                <div class="text-center" style="max-width: 400px;">
+                    <div class="mb-4 bg-white p-4 rounded-circle shadow-sm d-inline-block">
+                        <svg xmlns="http://www.w3.org/2000/svg" width="64" height="64" viewBox="0 0 24 24" fill="none" stroke="#3b82f6" stroke-width="1.5" stroke-linecap="round" stroke-linejoin="round"><path d="M21 15a2 2 0 0 1-2 2H7l-4 4V5a2 2 0 0 1 2-2h14a2 2 0 0 1 2 2z"/></svg>
+                    </div>
+                    <h3 class="fw-bold">Seamless Collaboration</h3>
+                    <p class="text-muted">Select a colleague or channel from the sidebar to start sharing clinical updates and patient data securely.</p>
+                    <button class="btn btn-primary mt-3 px-4 py-2 fw-semibold shadow-sm">Start New Thread</button>
+                </div>
+            </div>
+            
+            <footer class="p-3 border-top bg-white">
+                <div class="d-flex align-items-center gap-2">
+                    <button class="btn btn-light rounded-circle p-2 d-flex align-items-center justify-content-center" style="width: 40px; height: 40px;">
+                        <svg xmlns="http://www.w3.org/2000/svg" width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><line x1="12" y1="5" x2="12" y2="19"></line><line x1="5" y1="12" x2="19" y2="12"></line></svg>
+                    </button>
+                    <input type="text" class="form-control border-0 bg-light py-2 px-3" placeholder="Type a message to General Ward...">
+                    <button class="btn btn-primary rounded-circle p-2 d-flex align-items-center justify-content-center" style="width: 40px; height: 40px;">
+                        <svg xmlns="http://www.w3.org/2000/svg" width="20" height="20" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><line x1="22" y1="2" x2="11" y2="13"></line><polygon points="22 2 15 22 11 13 2 9 22 2"></polygon></svg>
+                    </button>
+                </div>
+            </footer>
+        </main>
+    </div>
+<?php endif; ?>
+
+    <!-- Bootstrap Bundle with Popper -->
+    <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0/dist/js/bootstrap.bundle.min.js"></script>
+    <!-- Custom JS -->
+    <script src="assets/js/main.js?v=<?php echo time(); ?>"></script>
 </body>
 </html>