diff --git a/static/css/main.css b/static/css/main.css
index 3734cc2..4d95093 100644
--- a/static/css/main.css
+++ b/static/css/main.css
@@ -1,37 +1,532 @@
-textarea {
-    width: 100%;
-    height: 80px;
+/* ===== CSS Variables ===== */
+:root {
+    --primary-color: #6366f1;
+    --primary-hover: #4f46e5;
+    --primary-light: #818cf8;
+    --secondary-color: #8b5cf6;
+    --accent-color: #06b6d4;
+    --success-color: #10b981;
+    --background-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
+    --glass-bg: rgba(255, 255, 255, 0.95);
+    --glass-border: rgba(255, 255, 255, 0.2);
+    --text-primary: #1f2937;
+    --text-secondary: #6b7280;
+    --text-light: #9ca3af;
+    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
+    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
+    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
+    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
+    --border-radius-sm: 8px;
+    --border-radius-md: 12px;
+    --border-radius-lg: 16px;
+    --border-radius-xl: 24px;
+    --transition-fast: 0.15s ease;
+    --transition-normal: 0.3s ease;
+    --transition-slow: 0.5s ease;
 }
 
-#messages {
+/* ===== Reset & Base Styles ===== */
+* {
+    margin: 0;
+    padding: 0;
+    box-sizing: border-box;
+}
+
+body {
+    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
+    background: var(--background-gradient);
+    min-height: 100vh;
+    display: flex;
+    justify-content: center;
+    align-items: center;
+    padding: 20px;
+    color: var(--text-primary);
+    line-height: 1.6;
+}
+
+/* ===== App Container ===== */
+.app-container {
+    width: 100%;
+    max-width: 900px;
+    height: 90vh;
+    max-height: 800px;
+    background: var(--glass-bg);
+    backdrop-filter: blur(20px);
+    border-radius: var(--border-radius-xl);
+    box-shadow: var(--shadow-xl);
     display: flex;
     flex-direction: column;
-    gap: 10px;
-    padding: 20px;
+    overflow: hidden;
+    border: 1px solid var(--glass-border);
+    animation: fadeInUp 0.6s ease-out;
 }
 
+@keyframes fadeInUp {
+    from {
+        opacity: 0;
+        transform: translateY(30px);
+    }
+
+    to {
+        opacity: 1;
+        transform: translateY(0);
+    }
+}
+
+/* ===== Header ===== */
+.chat-header {
+    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
+    padding: 20px 24px;
+    display: flex;
+    justify-content: space-between;
+    align-items: center;
+    box-shadow: var(--shadow-md);
+    z-index: 10;
+}
+
+.header-content {
+    display: flex;
+    align-items: center;
+    gap: 12px;
+}
+
+.logo-icon {
+    width: 40px;
+    height: 40px;
+    background: rgba(255, 255, 255, 0.2);
+    border-radius: var(--border-radius-md);
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    color: white;
+    animation: pulse 2s infinite;
+}
+
+@keyframes pulse {
+
+    0%,
+    100% {
+        transform: scale(1);
+    }
+
+    50% {
+        transform: scale(1.05);
+    }
+}
+
+.header-title {
+    font-size: 1.5rem;
+    font-weight: 700;
+    color: white;
+    letter-spacing: -0.5px;
+}
+
+.header-status {
+    display: flex;
+    align-items: center;
+    gap: 8px;
+    background: rgba(255, 255, 255, 0.15);
+    padding: 6px 12px;
+    border-radius: 20px;
+}
+
+.status-dot {
+    width: 8px;
+    height: 8px;
+    background: var(--success-color);
+    border-radius: 50%;
+    animation: blink 1.5s infinite;
+}
+
+@keyframes blink {
+
+    0%,
+    100% {
+        opacity: 1;
+    }
+
+    50% {
+        opacity: 0.5;
+    }
+}
+
+.status-text {
+    color: white;
+    font-size: 0.875rem;
+    font-weight: 500;
+}
+
+/* ===== Main Content ===== */
+.chat-main {
+    flex: 1;
+    display: flex;
+    flex-direction: column;
+    overflow: hidden;
+    background: linear-gradient(180deg, #f8fafc 0%, #f1f5f9 100%);
+}
+
+/* ===== Welcome Section ===== */
+.welcome-section {
+    flex: 1;
+    display: flex;
+    flex-direction: column;
+    align-items: center;
+    justify-content: center;
+    padding: 40px 20px;
+    text-align: center;
+    animation: fadeIn 0.8s ease-out;
+}
+
+@keyframes fadeIn {
+    from {
+        opacity: 0;
+    }
+
+    to {
+        opacity: 1;
+    }
+}
+
+.welcome-icon {
+    width: 80px;
+    height: 80px;
+    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
+    border-radius: 50%;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    color: white;
+    margin-bottom: 24px;
+    box-shadow: var(--shadow-lg);
+    animation: float 3s ease-in-out infinite;
+}
+
+@keyframes float {
+
+    0%,
+    100% {
+        transform: translateY(0);
+    }
+
+    50% {
+        transform: translateY(-10px);
+    }
+}
+
+.welcome-title {
+    font-size: 2rem;
+    font-weight: 700;
+    color: var(--text-primary);
+    margin-bottom: 8px;
+    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
+    -webkit-background-clip: text;
+    -webkit-text-fill-color: transparent;
+    background-clip: text;
+}
+
+.welcome-subtitle {
+    font-size: 1.125rem;
+    color: var(--text-secondary);
+    margin-bottom: 32px;
+    max-width: 500px;
+}
+
+.sample-question {
+    background: white;
+    padding: 20px 24px;
+    border-radius: var(--border-radius-lg);
+    box-shadow: var(--shadow-md);
+    max-width: 600px;
+    border-left: 4px solid var(--primary-color);
+    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
+}
+
+.sample-question:hover {
+    transform: translateY(-2px);
+    box-shadow: var(--shadow-lg);
+}
+
+.sample-label {
+    display: block;
+    font-size: 0.75rem;
+    font-weight: 600;
+    color: var(--primary-color);
+    text-transform: uppercase;
+    letter-spacing: 0.5px;
+    margin-bottom: 8px;
+}
+
+.sample-text {
+    font-size: 1rem;
+    color: var(--text-primary);
+    font-style: italic;
+}
+
+/* ===== Messages Container ===== */
+.messages-container {
+    flex: 1;
+    display: flex;
+    flex-direction: column;
+    gap: 16px;
+    padding: 24px;
+    overflow-y: auto;
+    scroll-behavior: smooth;
+}
+
+.messages-container::-webkit-scrollbar {
+    width: 6px;
+}
+
+.messages-container::-webkit-scrollbar-track {
+    background: transparent;
+}
+
+.messages-container::-webkit-scrollbar-thumb {
+    background: var(--text-light);
+    border-radius: 3px;
+}
+
+.messages-container::-webkit-scrollbar-thumb:hover {
+    background: var(--text-secondary);
+}
+
+/* ===== Message Styles ===== */
 .message {
-    max-width: 70%;
-    padding: 10px 15px;
-    border-radius: 15px;
-    font-family: sans-serif;
-    line-height: 1.4;
+    max-width: 75%;
+    padding: 14px 18px;
+    border-radius: var(--border-radius-lg);
+    font-size: 0.95rem;
+    line-height: 1.6;
+    animation: messageSlide 0.3s ease-out;
+    word-wrap: break-word;
+}
+
+@keyframes messageSlide {
+    from {
+        opacity: 0;
+        transform: translateY(10px);
+    }
+
+    to {
+        opacity: 1;
+        transform: translateY(0);
+    }
 }
 
 .sent {
-    max-width: 70%;
-    background-color: lightgreen;
-    padding: 10px 15px;
-    border-radius: 15px;
-    font-family: sans-serif;
-    line-height: 1.4;
     align-self: flex-end;
-    border-bottom-right-radius: 2px;
+    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
+    color: white;
+    border-bottom-right-radius: 4px;
+    box-shadow: var(--shadow-md);
+}
+
+.sent a {
+    color: white;
+    text-decoration: underline;
 }
 
 .received {
     align-self: flex-start;
-    background-color: #e5e5ea;
-    color: black;
-    border-bottom-left-radius: 2px;
+    background: white;
+    color: var(--text-primary);
+    border-bottom-left-radius: 4px;
+    box-shadow: var(--shadow-sm);
+    border: 1px solid rgba(0, 0, 0, 0.05);
+}
+
+.received a {
+    color: var(--primary-color);
+    text-decoration: none;
+}
+
+.received a:hover {
+    text-decoration: underline;
+}
+
+/* ===== Footer ===== */
+.chat-footer {
+    background: white;
+    padding: 20px 24px;
+    border-top: 1px solid rgba(0, 0, 0, 0.05);
+    box-shadow: 0 -4px 6px -1px rgba(0, 0, 0, 0.05);
+}
+
+.input-wrapper {
+    display: flex;
+    gap: 12px;
+    align-items: flex-end;
+    background: var(--background-gradient);
+    padding: 6px;
+    border-radius: var(--border-radius-lg);
+    box-shadow: var(--shadow-md);
+    transition: box-shadow var(--transition-normal);
+}
+
+.input-wrapper:focus-within {
+    box-shadow: var(--shadow-lg);
+}
+
+.message-input {
+    flex: 1;
+    background: white;
+    border: none;
+    border-radius: var(--border-radius-md);
+    padding: 14px 16px;
+    font-size: 1rem;
+    font-family: inherit;
+    color: var(--text-primary);
+    resize: none;
+    outline: none;
+    min-height: 50px;
+    max-height: 150px;
+    transition: box-shadow var(--transition-fast);
+}
+
+.message-input::placeholder {
+    color: var(--text-light);
+}
+
+.message-input:focus {
+    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
+}
+
+.send-button {
+    width: 50px;
+    height: 50px;
+    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
+    border: none;
+    border-radius: var(--border-radius-md);
+    color: white;
+    cursor: pointer;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    transition: all var(--transition-normal);
+    box-shadow: var(--shadow-md);
+    flex-shrink: 0;
+}
+
+.send-button:hover {
+    transform: scale(1.05);
+    box-shadow: var(--shadow-lg);
+}
+
+.send-button:active {
+    transform: scale(0.95);
+}
+
+.send-button:disabled {
+    opacity: 0.5;
+    cursor: not-allowed;
+    transform: none;
+}
+
+.footer-hint {
+    text-align: center;
+    font-size: 0.75rem;
+    color: var(--text-light);
+    margin-top: 12px;
+}
+
+/* ===== Responsive Design ===== */
+@media (max-width: 768px) {
+    body {
+        padding: 10px;
+    }
+
+    .app-container {
+        height: 95vh;
+        max-height: none;
+        border-radius: var(--border-radius-lg);
+    }
+
+    .chat-header {
+        padding: 16px 20px;
+    }
+
+    .header-title {
+        font-size: 1.25rem;
+    }
+
+    .welcome-section {
+        padding: 30px 16px;
+    }
+
+    .welcome-icon {
+        width: 64px;
+        height: 64px;
+    }
+
+    .welcome-title {
+        font-size: 1.5rem;
+    }
+
+    .welcome-subtitle {
+        font-size: 1rem;
+    }
+
+    .sample-question {
+        padding: 16px 20px;
+    }
+
+    .messages-container {
+        padding: 16px;
+        gap: 12px;
+    }
+
+    .message {
+        max-width: 85%;
+        padding: 12px 14px;
+        font-size: 0.9rem;
+    }
+
+    .chat-footer {
+        padding: 16px 20px;
+    }
+
+    .message-input {
+        padding: 12px 14px;
+        font-size: 0.95rem;
+    }
+
+    .send-button {
+        width: 46px;
+        height: 46px;
+    }
+}
+
+@media (max-width: 480px) {
+    .header-status {
+        display: none;
+    }
+
+    .message {
+        max-width: 90%;
+    }
+
+    .sample-question {
+        padding: 14px 16px;
+    }
+
+    .sample-text {
+        font-size: 0.9rem;
+    }
+}
+
+/* ===== Loading Animation ===== */
+@keyframes shimmer {
+    0% {
+        background-position: -200% 0;
+    }
+
+    100% {
+        background-position: 200% 0;
+    }
+}
+
+.loading-message {
+    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
+    background-size: 200% 100%;
+    animation: shimmer 1.5s infinite;
 }
\ No newline at end of file
diff --git a/static/templates/index.html b/static/templates/index.html
index dcd5279..7d42093 100644
--- a/static/templates/index.html
+++ b/static/templates/index.html
@@ -4,19 +4,56 @@
     <meta charset="UTF-8">
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
     <link rel="stylesheet" href="/static/css/main.css">
-    <title>Document</title>
+    <title>AI Chat Assistant</title>
 </head>
 <body>
-    <h1>Chat</h1>
-    <p>Come si calcola la massa magra? dammi una spiegazione dettagliata</p>
+    <div class="app-container">
+        <header class="chat-header">
+            <div class="header-content">
+                <div class="logo-icon">
+                    <svg width="32" height="32" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg">
+                        <path d="M12 2C6.48 2 2 6.48 2 12C2 17.52 6.48 22 12 22C17.52 22 22 17.52 22 12C22 6.48 17.52 2 12 2ZM12 6C13.66 6 15 7.34 15 9C15 10.66 13.66 12 12 12C10.34 12 9 10.66 9 9C9 7.34 10.34 6 12 6ZM12 19.2C9.5 19.2 7.29 17.92 6 15.98C6.03 13.99 10 12.9 12 12.9C13.99 12.9 17.97 13.99 18 15.98C16.71 17.92 14.5 19.2 12 19.2Z" fill="currentColor"/>
+                    </svg>
+                </div>
+                <h1 class="header-title">AI Chat Assistant</h1>
+            </div>
+            <div class="header-status">
+                <span class="status-dot"></span>
+                <span class="status-text">Online</span>
+            </div>
+        </header>
 
-    <div>
-        <textarea name="" id="message"></textarea>
-        <input id="button" type="button" value="Send">
+        <main class="chat-main">
+            <div class="welcome-section">
+                <div class="welcome-icon">
+                    <svg width="64" height="64" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg">
+                        <path d="M20 2H4C2.9 2 2 2.9 2 4V22L6 18H20C21.1 18 22 17.1 22 16V4C22 2.9 21.1 2 20 2ZM20 16H6L4 18V4H20V16Z" fill="currentColor"/>
+                    </svg>
+                </div>
+                <h2 class="welcome-title">Welcome to AI Chat</h2>
+                <p class="welcome-subtitle">Ask me anything and I'll help you find answers</p>
+                <div class="sample-question">
+                    <span class="sample-label">Example question:</span>
+                    <p class="sample-text">Come si calcola la massa magra? dammi una spiegazione dettagliata</p>
+                </div>
+            </div>
+
+            <div id="messages" class="messages-container"></div>
+        </main>
+
+        <footer class="chat-footer">
+            <div class="input-wrapper">
+                <textarea id="message" class="message-input" placeholder="Type your message here..." rows="1"></textarea>
+                <button id="button" class="send-button">
+                    <svg width="24" height="24" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg">
+                        <path d="M2.01 21L23 12 2.01 3 2 10l15 2-15 2z" fill="currentColor"/>
+                    </svg>
+                </button>
+            </div>
+            <p class="footer-hint">Press Enter to send, Shift+Enter for new line</p>
+        </footer>
     </div>
 
-    <div id="messages"></div>
-
     <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.7.1/jquery.min.js"></script>
     <script src="https://cdn.jsdelivr.net/npm/marked/marked.min.js"></script>
     <script src="/static/js/main.js"></script>