diff --git a/src/handlers/chat.rs b/src/handlers/chat.rs
index b91568a..281f6d6 100644
--- a/src/handlers/chat.rs
+++ b/src/handlers/chat.rs
@@ -284,7 +284,7 @@ pub async fn new_session(
             hx-target=\"#messages\" \
             hx-swap=\"beforeend\" \
             hx-on=\"htmx:afterRequest: this.reset(); scrollMessages()\">\
-            <input id=\"chat-input\" type=\"text\" name=\"content\" placeholder=\"Type your message...\" autocomplete=\"off\" maxlength=\"1000\" oninput=\"sendUserTyping()\" required />\
+            <input id=\"chat-input\" type=\"text\" name=\"content\" placeholder=\"Type your message...\" autocomplete=\"off\" maxlength=\"1000\" oninput=\"handleUserTypingInput()\" required />\
             <button type=\"submit\">Send</button>\
           </form>\
         </div>\
diff --git a/src/handlers/ws.rs b/src/handlers/ws.rs
index 2d330fd..96dac2d 100644
--- a/src/handlers/ws.rs
+++ b/src/handlers/ws.rs
@@ -9,8 +9,10 @@ use std::sync::Arc;
 
 use crate::state::{AppState, RESET_EVENT};
 
-const USER_TYPING_PREFIX: &str = "typing:user:";
-const SUPPORTER_TYPING_PREFIX: &str = "typing:supporter:";
+const USER_TYPING_START_PREFIX: &str = "typing:user:start:";
+const USER_TYPING_STOP_PREFIX: &str = "typing:user:stop:";
+const SUPPORTER_TYPING_START_PREFIX: &str = "typing:supporter:start:";
+const SUPPORTER_TYPING_STOP_PREFIX: &str = "typing:supporter:stop:";
 
 /// WebSocket for user — pushes notifications when supporter replies
 pub async fn user_ws(
@@ -21,6 +23,13 @@ pub async fn user_ws(
     ws.on_upgrade(move |socket| handle_user_socket(socket, session_id, state))
 }
 
+fn is_typing_event_for_session(text: &str, session_id: &str) -> bool {
+    text.strip_prefix(USER_TYPING_START_PREFIX) == Some(session_id)
+        || text.strip_prefix(USER_TYPING_STOP_PREFIX) == Some(session_id)
+        || text.strip_prefix(SUPPORTER_TYPING_START_PREFIX) == Some(session_id)
+        || text.strip_prefix(SUPPORTER_TYPING_STOP_PREFIX) == Some(session_id)
+}
+
 async fn handle_user_socket(mut socket: WebSocket, session_id: String, state: Arc<AppState>) {
     let tx = state.get_or_create_notifier(&session_id);
     let mut rx = tx.subscribe();
@@ -28,9 +37,9 @@ async fn handle_user_socket(mut socket: WebSocket, session_id: String, state: Ar
     loop {
         tokio::select! {
             // Forward broadcast events to the user browser.
-            Ok(sid) = rx.recv() => {
-                if sid == session_id || sid == RESET_EVENT || sid.starts_with(SUPPORTER_TYPING_PREFIX) || sid.starts_with(USER_TYPING_PREFIX) {
-                    if socket.send(Message::Text(sid)).await.is_err() {
+            Ok(event) = rx.recv() => {
+                if event == session_id || event == RESET_EVENT || is_typing_event_for_session(&event, &session_id) {
+                    if socket.send(Message::Text(event)).await.is_err() {
                         break;
                     }
                 }
@@ -39,8 +48,9 @@ async fn handle_user_socket(mut socket: WebSocket, session_id: String, state: Ar
             msg = socket.recv() => {
                 match msg {
                     Some(Ok(Message::Text(text))) => {
-                        let expected = format!("{USER_TYPING_PREFIX}{session_id}");
-                        if text == expected {
+                        if is_typing_event_for_session(&text, &session_id)
+                            && (text.starts_with(USER_TYPING_START_PREFIX) || text.starts_with(USER_TYPING_STOP_PREFIX))
+                        {
                             let _ = tx.send(text.clone());
                             let _ = state.supporter_notifier.send(text);
                         }
@@ -62,20 +72,25 @@ pub async fn supporter_ws(
     ws.on_upgrade(move |socket| handle_supporter_socket(socket, state))
 }
 
+fn supporter_typing_session_id(text: &str) -> Option<&str> {
+    text.strip_prefix(SUPPORTER_TYPING_START_PREFIX)
+        .or_else(|| text.strip_prefix(SUPPORTER_TYPING_STOP_PREFIX))
+}
+
 async fn handle_supporter_socket(mut socket: WebSocket, state: Arc<AppState>) {
     let mut rx = state.supporter_notifier.subscribe();
 
     loop {
         tokio::select! {
-            Ok(session_id) = rx.recv() => {
-                if socket.send(Message::Text(session_id)).await.is_err() {
+            Ok(event) = rx.recv() => {
+                if socket.send(Message::Text(event)).await.is_err() {
                     break;
                 }
             }
             msg = socket.recv() => {
                 match msg {
                     Some(Ok(Message::Text(text))) => {
-                        if let Some(session_id) = text.strip_prefix(SUPPORTER_TYPING_PREFIX) {
+                        if let Some(session_id) = supporter_typing_session_id(&text) {
                             if !session_id.is_empty() && state.sessions.contains_key(session_id) {
                                 let tx = state.get_or_create_notifier(session_id);
                                 let _ = tx.send(text);
diff --git a/templates/index.html b/templates/index.html
index 5ba4fcc..a9fa163 100644
--- a/templates/index.html
+++ b/templates/index.html
@@ -14,6 +14,9 @@
       --surface-soft: #20242c;
       --border: #2b303a;
       --accent: #8f9cff;
+      --danger: #d93d3d;
+      --danger-soft: rgba(217, 61, 61, 0.16);
+      --danger-text: #ffd1d1;
       --text: #eceff4;
       --muted: #9aa3b2;
       --radius: 14px;
@@ -21,13 +24,14 @@
 
     body {
       min-height: 100vh;
+      min-height: 100dvh;
       background: var(--bg);
       color: var(--text);
       font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
       display: flex;
       align-items: center;
       justify-content: center;
-      padding: 1.5rem;
+      padding: 1.25rem;
     }
 
     .card {
@@ -42,24 +46,27 @@
     .timer {
       display: inline-flex;
       margin-bottom: 1rem;
-      color: var(--muted);
-      border: 1px solid var(--border);
+      color: var(--danger-text);
+      border: 1px solid var(--danger);
       border-radius: 999px;
-      padding: 0.35rem 0.75rem;
-      font-size: 0.78rem;
-      background: var(--bg);
+      padding: 0.38rem 0.8rem;
+      font-size: 0.82rem;
+      font-weight: 800;
+      background: var(--danger-soft);
+      box-shadow: 0 0 0 1px rgba(217, 61, 61, 0.08), 0 8px 24px rgba(217, 61, 61, 0.08);
     }
 
     h1 {
-      font-size: clamp(1.6rem, 4vw, 2.15rem);
+      font-size: clamp(1.55rem, 4vw, 2.1rem);
       letter-spacing: -0.035em;
-      margin-bottom: 0.5rem;
+      margin-bottom: 0.55rem;
     }
 
     p {
       color: var(--muted);
-      line-height: 1.6;
-      margin-bottom: 1.5rem;
+      line-height: 1.55;
+      margin-bottom: 1.25rem;
+      font-size: 0.95rem;
     }
 
     .choices {
@@ -77,7 +84,7 @@
       background: var(--surface-soft);
       border: 1px solid var(--border);
       border-radius: var(--radius);
-      padding: 1.1rem;
+      padding: 1.05rem;
       transition: transform 0.15s, border-color 0.15s, background 0.15s;
     }
 
@@ -88,11 +95,13 @@
     }
 
     .role-title { font-weight: 700; font-size: 1rem; }
-    .role-detail { color: var(--muted); font-size: 0.88rem; }
+    .role-detail { color: var(--muted); font-size: 0.88rem; line-height: 1.45; }
 
     @media (max-width: 560px) {
+      body { align-items: stretch; padding: 1rem; }
       .choices { grid-template-columns: 1fr; }
-      .card { padding: 1.5rem; }
+      .card { padding: 1.35rem; border-radius: 18px; align-self: center; }
+      .timer { width: 100%; justify-content: center; }
     }
   </style>
 </head>
@@ -100,12 +109,12 @@
   <main class="card">
     <span class="timer" hx-get="/reset-countdown" hx-trigger="load, every 1s" hx-swap="innerHTML">Reset in --:--</span>
     <h1>Support chat</h1>
-    <p>Open the side you want to test. Each option opens in a new tab.</p>
+    <p>A small in-memory chat demo with separate user and supporter views. Conversations, messages, and rate limits reset every 3 minutes.</p>
 
     <div class="choices">
       <a href="/user" target="_blank" rel="noopener noreferrer">
         <span class="role-title">User</span>
-        <span class="role-detail">Start a new conversation</span>
+        <span class="role-detail">Start a conversation</span>
       </a>
       <a href="/supporter" target="_blank" rel="noopener noreferrer">
         <span class="role-title">Supporter</span>
diff --git a/templates/supporter.html b/templates/supporter.html
index a95470c..595f427 100644
--- a/templates/supporter.html
+++ b/templates/supporter.html
@@ -15,6 +15,9 @@
       --border: #2b303a;
       --accent: #8f9cff;
       --accent-dim: #737fd3;
+      --danger: #d93d3d;
+      --danger-soft: rgba(217, 61, 61, 0.16);
+      --danger-text: #ffd1d1;
       --text: #eceff4;
       --muted: #9aa3b2;
       --user: #8f9cff;
@@ -32,9 +35,10 @@
 
     .layout {
       display: grid;
-      grid-template-columns: 280px 1fr;
-      grid-template-rows: 56px 1fr;
+      grid-template-columns: 280px minmax(0, 1fr);
+      grid-template-rows: 56px minmax(0, 1fr);
       height: 100vh;
+      height: 100dvh;
     }
 
     .topbar {
@@ -42,7 +46,7 @@
       display: flex;
       align-items: center;
       gap: 0.75rem;
-      padding: 0 1.5rem;
+      padding: 0 1.25rem;
       border-bottom: 1px solid var(--border);
       background: var(--surface);
     }
@@ -54,13 +58,20 @@
     }
 
     .topbar-timer {
+      display: inline-flex;
+      align-items: center;
+      justify-content: center;
       margin-left: auto;
-      font-size: 0.78rem;
-      color: var(--muted);
-      background: var(--bg);
-      padding: 0.25rem 0.65rem;
+      font-size: 0.82rem;
+      color: var(--danger-text);
+      background: var(--danger-soft);
+      padding: 0.34rem 0.75rem;
       border-radius: 20px;
-      border: 1px solid var(--border);
+      border: 1px solid var(--danger);
+      font-weight: 800;
+      letter-spacing: 0.01em;
+      box-shadow: 0 0 0 1px rgba(217, 61, 61, 0.08), 0 8px 24px rgba(217, 61, 61, 0.08);
+      white-space: nowrap;
     }
 
     .sidebar {
@@ -68,6 +79,7 @@
       display: flex;
       flex-direction: column;
       overflow: hidden;
+      min-width: 0;
     }
 
     .sidebar-header {
@@ -89,8 +101,10 @@
       gap: 0.3rem;
     }
 
-    #session-list::-webkit-scrollbar { width: 4px; }
-    #session-list::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }
+    #session-list::-webkit-scrollbar,
+    #supporter-messages::-webkit-scrollbar { width: 4px; height: 4px; }
+    #session-list::-webkit-scrollbar-thumb,
+    #supporter-messages::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }
 
     .session-item {
       width: 100%;
@@ -117,6 +131,7 @@
       display: flex;
       align-items: center;
       gap: 0.5rem;
+      flex-wrap: wrap;
     }
 
     .session-badge {
@@ -145,41 +160,55 @@
     .main-panel {
       display: flex;
       flex-direction: column;
+      align-items: center;
       overflow: hidden;
+      min-width: 0;
+      background: var(--bg);
+    }
+
+    .main-header,
+    #supporter-messages,
+    .typing-bubble,
+    #reply-area {
+      width: min(760px, 100%);
     }
 
     .main-header {
-      padding: 0.9rem 1.5rem;
+      padding: 0.85rem 1rem;
       border-bottom: 1px solid var(--border);
       display: flex;
       align-items: center;
       gap: 0.5rem;
-      min-height: 56px;
+      min-height: 54px;
+      background: var(--bg);
     }
 
     #active-session-name {
       font-weight: 700;
       font-size: 1rem;
+      min-width: 0;
+      overflow: hidden;
+      text-overflow: ellipsis;
+      white-space: nowrap;
     }
 
     #active-session-meta {
-      font-size: 0.8rem;
+      font-size: 0.78rem;
       color: var(--muted);
+      white-space: nowrap;
     }
 
     #supporter-messages {
       flex: 1;
+      min-height: 0;
       overflow-y: auto;
-      padding: 1.2rem 1.5rem;
+      padding: 1rem;
       display: flex;
       flex-direction: column;
       gap: 0.5rem;
       scroll-behavior: smooth;
     }
 
-    #supporter-messages::-webkit-scrollbar { width: 4px; }
-    #supporter-messages::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }
-
     .empty-state {
       flex: 1;
       display: flex;
@@ -189,6 +218,8 @@
       color: var(--muted);
       gap: 0.5rem;
       font-size: 0.9rem;
+      text-align: center;
+      padding: 1rem;
     }
 
     .msg-wrap { display: flex; }
@@ -196,11 +227,12 @@
     .msg-supporter-wrap { justify-content: flex-start; }
 
     .msg-user, .msg-supporter {
-      max-width: 65%;
-      padding: 0.6rem 0.9rem;
+      max-width: min(72%, 520px);
+      padding: 0.58rem 0.85rem;
       border-radius: 16px;
       font-size: 0.88rem;
-      line-height: 1.5;
+      line-height: 1.48;
+      overflow-wrap: anywhere;
     }
 
     .msg-user {
@@ -217,7 +249,7 @@
 
     .msg-label {
       display: block;
-      font-size: 0.7rem;
+      font-size: 0.68rem;
       font-weight: 600;
       opacity: 0.7;
       margin-bottom: 2px;
@@ -229,7 +261,7 @@
 
     .msg-time {
       display: block;
-      font-size: 0.68rem;
+      font-size: 0.66rem;
       opacity: 0.55;
       margin-top: 4px;
       text-align: right;
@@ -239,30 +271,44 @@
     .msg-system-text {
       font-size: 0.75rem;
       color: var(--muted);
-      background: var(--bg);
+      background: var(--surface);
       padding: 0.25rem 0.75rem;
       border-radius: 20px;
+      text-align: center;
     }
 
     .typing-bubble {
       display: none;
-      padding: 0 1.5rem 0.55rem;
+      padding: 0 1rem 0.55rem;
       justify-content: flex-start;
     }
 
     .typing-bubble.visible { display: flex; }
 
     .typing-bubble-inner {
+      position: relative;
       display: inline-flex;
       align-items: center;
       gap: 4px;
       min-width: 48px;
-      padding: 0.65rem 0.85rem;
+      padding: 0.58rem 0.78rem;
       background: var(--supporter);
       border-radius: 16px;
       border-bottom-left-radius: 4px;
     }
 
+    .typing-bubble-inner::after {
+      content: "";
+      position: absolute;
+      left: 7px;
+      bottom: -4px;
+      width: 9px;
+      height: 9px;
+      background: var(--supporter);
+      transform: rotate(45deg);
+      border-radius: 2px;
+    }
+
     .typing-dot {
       width: 6px;
       height: 6px;
@@ -281,15 +327,17 @@
 
     #reply-area {
       border-top: 1px solid var(--border);
-      padding: 0.75rem 1.5rem;
+      padding: 0.65rem 1rem 0.8rem;
       display: none;
+      background: var(--bg);
     }
 
-    #reply-area.visible { display: flex; gap: 0.6rem; }
+    #reply-area.visible { display: flex; gap: 0.5rem; }
 
     #reply-area input[type="text"] {
       flex: 1;
-      padding: 0.65rem 1rem;
+      min-width: 0;
+      padding: 0.58rem 0.85rem;
       background: var(--surface);
       border: 1px solid var(--border);
       border-radius: var(--radius);
@@ -302,7 +350,7 @@
     #reply-area input[type="text"]:focus { border-color: var(--accent); }
 
     #reply-area button {
-      padding: 0.65rem 1.2rem;
+      padding: 0.58rem 1rem;
       background: var(--accent);
       color: #111318;
       border: none;
@@ -311,9 +359,70 @@
       font-size: 0.88rem;
       cursor: pointer;
       transition: background 0.2s;
+      white-space: nowrap;
     }
 
     #reply-area button:hover { background: var(--accent-dim); }
+
+    @media (max-width: 820px) {
+      html, body { overflow: hidden; }
+
+      .layout {
+        grid-template-columns: minmax(0, 1fr);
+        grid-template-rows: auto auto minmax(0, 1fr);
+      }
+
+      .topbar {
+        min-height: 56px;
+        padding: 0.65rem 0.85rem;
+        flex-wrap: wrap;
+      }
+
+      .topbar-timer {
+        margin-left: 0;
+        font-size: 0.78rem;
+        padding: 0.3rem 0.65rem;
+      }
+
+      .sidebar {
+        border-right: 0;
+        border-bottom: 1px solid var(--border);
+        max-height: 30vh;
+      }
+
+      .sidebar-header { padding: 0.7rem 0.85rem; }
+
+      #session-list {
+        flex-direction: row;
+        overflow-x: auto;
+        overflow-y: hidden;
+        padding: 0.5rem 0.75rem 0.65rem;
+      }
+
+      .session-item {
+        min-width: 190px;
+        max-width: 230px;
+      }
+
+      .main-header,
+      #supporter-messages,
+      .typing-bubble,
+      #reply-area { width: 100%; }
+
+      .main-header { padding: 0.75rem 0.85rem; min-height: 48px; }
+      #supporter-messages { padding: 0.85rem; }
+      .msg-user, .msg-supporter { max-width: 86%; }
+      #reply-area { padding: 0.6rem 0.75rem 0.75rem; }
+    }
+
+    @media (max-width: 460px) {
+      .topbar { align-items: flex-start; flex-direction: column; gap: 0.45rem; }
+      .topbar-timer { width: 100%; justify-content: center; text-align: center; }
+      .sidebar { max-height: 28vh; }
+      .session-item { min-width: 165px; }
+      #reply-area.visible { gap: 0.4rem; }
+      #reply-area button { padding-inline: 0.85rem; }
+    }
   </style>
 </head>
 <body>
@@ -362,8 +471,8 @@
 <script>
   let activeSessionId = null;
   let supporterWs = null;
-  let typingHideTimer = null;
-  let lastTypingSent = 0;
+  let lastTypingSessionId = null;
+  let supporterTypingActive = false;
 
   function selectSession(button) {
     document.querySelectorAll('.session-item').forEach(function(b) { b.classList.remove('selected'); });
@@ -372,17 +481,22 @@
   }
 
   function setActiveSession(sessionId, name) {
+    stopSupporterTyping(lastTypingSessionId);
     activeSessionId = sessionId;
     document.getElementById('active-session-name').textContent = name;
+    document.getElementById('active-session-name').style.color = '';
     document.getElementById('active-session-meta').textContent = '#' + sessionId.slice(0, 8);
     document.getElementById('reply-area').classList.add('visible');
+    document.getElementById('reply-input').value = '';
     hideUserTyping();
     scrollSupporterMessages();
   }
 
   function resetSupporterDashboard() {
+    stopSupporterTyping(lastTypingSessionId);
     activeSessionId = null;
     document.getElementById('active-session-name').textContent = 'Select a conversation';
+    document.getElementById('active-session-name').style.color = 'var(--muted)';
     document.getElementById('active-session-meta').textContent = '';
     document.getElementById('reply-area').classList.remove('visible');
     hideUserTyping();
@@ -399,23 +513,43 @@
     const indicator = document.getElementById('supporter-peer-typing');
     if (!indicator) return;
     indicator.classList.add('visible');
-    clearTimeout(typingHideTimer);
-    typingHideTimer = setTimeout(hideUserTyping, 1400);
     scrollSupporterMessages();
   }
 
   function hideUserTyping() {
     const indicator = document.getElementById('supporter-peer-typing');
     if (indicator) indicator.classList.remove('visible');
-    clearTimeout(typingHideTimer);
   }
 
-  function sendSupporterTyping() {
-    if (!activeSessionId || !supporterWs || supporterWs.readyState !== WebSocket.OPEN) return;
-    const now = Date.now();
-    if (now - lastTypingSent < 500) return;
-    lastTypingSent = now;
-    supporterWs.send(`typing:supporter:${activeSessionId}`);
+  function sendSupporterTypingState(state, sessionId = activeSessionId) {
+    if (!sessionId || !supporterWs || supporterWs.readyState !== WebSocket.OPEN) return;
+    supporterWs.send(`typing:supporter:${state}:${sessionId}`);
+  }
+
+  function startSupporterTyping() {
+    const input = document.getElementById('reply-input');
+    if (!activeSessionId || !input || !input.value.trim()) {
+      stopSupporterTyping(lastTypingSessionId || activeSessionId);
+      return;
+    }
+    if (supporterTypingActive && lastTypingSessionId === activeSessionId) return;
+    supporterTypingActive = true;
+    lastTypingSessionId = activeSessionId;
+    sendSupporterTypingState('start', activeSessionId);
+  }
+
+  function stopSupporterTyping(sessionId = activeSessionId) {
+    if (!supporterTypingActive && !sessionId) return;
+    const targetSession = sessionId || lastTypingSessionId;
+    if (targetSession) sendSupporterTypingState('stop', targetSession);
+    supporterTypingActive = false;
+    lastTypingSessionId = null;
+  }
+
+  function handleReplyInput() {
+    const input = document.getElementById('reply-input');
+    if (input && input.value.trim()) startSupporterTyping();
+    else stopSupporterTyping(lastTypingSessionId || activeSessionId);
   }
 
   document.addEventListener('htmx:afterSwap', (e) => {
@@ -428,6 +562,8 @@
     const content = input.value.trim();
     if (!content) return;
 
+    stopSupporterTyping(activeSessionId);
+
     fetch(`/supporter/send/${activeSessionId}`, {
       method: 'POST',
       headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
@@ -437,8 +573,8 @@
     .then(html => {
       const msgs = document.getElementById('supporter-messages');
       msgs.insertAdjacentHTML('beforeend', html);
-      scrollSupporterMessages();
       input.value = '';
+      scrollSupporterMessages();
     });
   });
 
@@ -446,7 +582,7 @@
     if (e.key === 'Enter') document.getElementById('reply-btn').click();
   });
 
-  document.getElementById('reply-input').addEventListener('input', sendSupporterTyping);
+  document.getElementById('reply-input').addEventListener('input', handleReplyInput);
 
   function connectSupporterWS() {
     const wsProtocol = location.protocol === 'https:' ? 'wss' : 'ws';
@@ -458,16 +594,22 @@
         resetSupporterDashboard();
         return;
       }
-      if (data.startsWith('typing:user:')) {
-        const sessionId = data.replace('typing:user:', '');
+      if (data.startsWith('typing:user:start:')) {
+        const sessionId = data.replace('typing:user:start:', '');
         if (sessionId === activeSessionId) showUserTyping();
         return;
       }
+      if (data.startsWith('typing:user:stop:')) {
+        const sessionId = data.replace('typing:user:stop:', '');
+        if (sessionId === activeSessionId) hideUserTyping();
+        return;
+      }
       if (data.startsWith('typing:supporter:')) return;
 
       htmx.trigger('#session-list', 'refresh');
 
       if (data === activeSessionId) {
+        hideUserTyping();
         fetch(`/messages/${activeSessionId}`)
           .then(r => r.text())
           .then(html => {
@@ -477,6 +619,9 @@
       }
     };
 
+    supporterWs.onopen = () => {
+      if (supporterTypingActive && lastTypingSessionId) sendSupporterTypingState('start', lastTypingSessionId);
+    };
     supporterWs.onclose = () => setTimeout(connectSupporterWS, 2000);
   }
 
diff --git a/templates/user.html b/templates/user.html
index c55a869..69b39ed 100644
--- a/templates/user.html
+++ b/templates/user.html
@@ -15,6 +15,9 @@
       --border: #2b303a;
       --accent: #8f9cff;
       --accent-dim: #737fd3;
+      --danger: #d93d3d;
+      --danger-soft: rgba(217, 61, 61, 0.16);
+      --danger-text: #ffd1d1;
       --text: #eceff4;
       --muted: #9aa3b2;
       --user: #8f9cff;
@@ -25,33 +28,40 @@
     body {
       background: var(--bg);
       min-height: 100vh;
+      min-height: 100dvh;
       display: flex;
       align-items: center;
       justify-content: center;
       font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
       color: var(--text);
-      padding: 1rem;
+      padding: 4.4rem 1rem 1rem;
     }
 
     .page-timer {
+      display: inline-flex;
+      align-items: center;
+      justify-content: center;
       position: fixed;
       top: 1rem;
       left: 50%;
       transform: translateX(-50%);
-      color: var(--muted);
-      border: 1px solid var(--border);
+      color: var(--danger-text);
+      border: 1px solid var(--danger);
       border-radius: 999px;
-      padding: 0.35rem 0.75rem;
-      font-size: 0.78rem;
-      background: var(--surface);
+      padding: 0.38rem 0.8rem;
+      font-size: 0.82rem;
+      font-weight: 800;
+      background: var(--danger-soft);
+      box-shadow: 0 0 0 1px rgba(217, 61, 61, 0.08), 0 8px 24px rgba(217, 61, 61, 0.08);
       z-index: 10;
+      white-space: nowrap;
     }
 
     #start-form {
       background: var(--surface);
       border: 1px solid var(--border);
       border-radius: 20px;
-      padding: 2.2rem;
+      padding: 2rem;
       width: min(360px, 100%);
       text-align: left;
       box-shadow: 0 18px 55px rgba(0, 0, 0, 0.22);
@@ -67,13 +77,13 @@
     #start-form p {
       font-size: 0.9rem;
       color: var(--muted);
-      margin-bottom: 1.5rem;
+      margin-bottom: 1.35rem;
       line-height: 1.55;
     }
 
     #start-form input[type="text"] {
       width: 100%;
-      padding: 0.75rem 1rem;
+      padding: 0.72rem 0.95rem;
       background: var(--bg);
       border: 1px solid var(--border);
       border-radius: var(--radius);
@@ -88,7 +98,7 @@
 
     #start-form button {
       width: 100%;
-      padding: 0.75rem;
+      padding: 0.72rem;
       background: var(--accent);
       color: #111318;
       border: none;
@@ -105,7 +115,8 @@
       display: none;
       flex-direction: column;
       width: min(390px, 100%);
-      height: min(600px, calc(100vh - 4.5rem));
+      height: min(620px, calc(100vh - 5.4rem));
+      height: min(620px, calc(100dvh - 5.4rem));
       background: var(--surface);
       border: 1px solid var(--border);
       border-radius: 20px;
@@ -117,23 +128,26 @@
       display: flex;
       align-items: center;
       gap: 0.6rem;
-      padding: 1rem 1.2rem;
+      padding: 0.9rem 1rem;
       border-bottom: 1px solid var(--border);
       font-weight: 700;
       font-size: 0.95rem;
+      min-height: 52px;
     }
 
     .chat-session-id {
       margin-left: auto;
-      font-size: 0.75rem;
+      font-size: 0.72rem;
       color: var(--muted);
       font-weight: 400;
+      white-space: nowrap;
     }
 
     #messages {
       flex: 1;
+      min-height: 0;
       overflow-y: auto;
-      padding: 1rem;
+      padding: 0.9rem;
       display: flex;
       flex-direction: column;
       gap: 0.5rem;
@@ -149,11 +163,12 @@
     .msg-supporter-wrap { justify-content: flex-start; }
 
     .msg-user, .msg-supporter {
-      max-width: 75%;
-      padding: 0.6rem 0.9rem;
+      max-width: 78%;
+      padding: 0.58rem 0.85rem;
       border-radius: 16px;
       font-size: 0.88rem;
-      line-height: 1.5;
+      line-height: 1.48;
+      overflow-wrap: anywhere;
     }
 
     .msg-user {
@@ -170,7 +185,7 @@
 
     .msg-label {
       display: block;
-      font-size: 0.7rem;
+      font-size: 0.68rem;
       font-weight: 600;
       opacity: 0.7;
       margin-bottom: 2px;
@@ -182,7 +197,7 @@
 
     .msg-time {
       display: block;
-      font-size: 0.68rem;
+      font-size: 0.66rem;
       opacity: 0.55;
       margin-top: 4px;
       text-align: right;
@@ -200,27 +215,41 @@
       background: var(--bg);
       padding: 0.25rem 0.75rem;
       border-radius: 20px;
+      text-align: center;
     }
 
     .typing-bubble {
       display: none;
-      padding: 0 1rem 0.55rem;
+      padding: 0 0.9rem 0.55rem;
       justify-content: flex-start;
     }
 
     .typing-bubble.visible { display: flex; }
 
     .typing-bubble-inner {
+      position: relative;
       display: inline-flex;
       align-items: center;
       gap: 4px;
       min-width: 48px;
-      padding: 0.65rem 0.85rem;
+      padding: 0.58rem 0.78rem;
       background: var(--supporter);
       border-radius: 16px;
       border-bottom-left-radius: 4px;
     }
 
+    .typing-bubble-inner::after {
+      content: "";
+      position: absolute;
+      left: 7px;
+      bottom: -4px;
+      width: 9px;
+      height: 9px;
+      background: var(--supporter);
+      transform: rotate(45deg);
+      border-radius: 2px;
+    }
+
     .typing-dot {
       width: 6px;
       height: 6px;
@@ -239,14 +268,15 @@
 
     #chat-form {
       display: flex;
-      gap: 0.5rem;
-      padding: 0.75rem 1rem;
+      gap: 0.45rem;
+      padding: 0.65rem 0.85rem 0.8rem;
       border-top: 1px solid var(--border);
     }
 
     #chat-form input[type="text"] {
       flex: 1;
-      padding: 0.6rem 0.9rem;
+      min-width: 0;
+      padding: 0.58rem 0.85rem;
       background: var(--bg);
       border: 1px solid var(--border);
       border-radius: var(--radius);
@@ -259,7 +289,7 @@
     #chat-form input[type="text"]:focus { border-color: var(--accent); }
 
     #chat-form button {
-      padding: 0.6rem 1.1rem;
+      padding: 0.58rem 1rem;
       background: var(--accent);
       color: #111318;
       border: none;
@@ -268,9 +298,19 @@
       font-size: 0.88rem;
       cursor: pointer;
       transition: background 0.2s;
+      white-space: nowrap;
     }
 
     #chat-form button:hover { background: var(--accent-dim); }
+
+    @media (max-width: 520px) {
+      body { align-items: stretch; padding: 4.2rem 0.75rem 0.75rem; }
+      .page-timer { top: 0.75rem; width: calc(100% - 1.5rem); text-align: center; justify-content: center; }
+      #start-form { align-self: center; padding: 1.45rem; border-radius: 18px; }
+      #chat-container { height: calc(100vh - 5rem); height: calc(100dvh - 5rem); border-radius: 18px; }
+      .chat-session-id { display: none; }
+      .msg-user, .msg-supporter { max-width: 86%; }
+    }
   </style>
 </head>
 <body>
@@ -291,8 +331,7 @@
 
   <script>
     let ws = null;
-    let typingHideTimer = null;
-    let lastTypingSent = 0;
+    let userTypingActive = false;
 
     function scrollMessages() {
       const el = document.getElementById('messages');
@@ -303,27 +342,51 @@
       const indicator = document.getElementById('peer-typing');
       if (!indicator) return;
       indicator.classList.add('visible');
-      clearTimeout(typingHideTimer);
-      typingHideTimer = setTimeout(() => indicator.classList.remove('visible'), 1400);
       scrollMessages();
     }
 
-    function sendUserTyping() {
+    function hideSupporterTyping() {
+      const indicator = document.getElementById('peer-typing');
+      if (indicator) indicator.classList.remove('visible');
+    }
+
+    function sendUserTypingState(state) {
       if (!ws || ws.readyState !== WebSocket.OPEN || !window.__sessionId) return;
-      const now = Date.now();
-      if (now - lastTypingSent < 500) return;
-      lastTypingSent = now;
-      ws.send(`typing:user:${window.__sessionId}`);
+      ws.send(`typing:user:${state}:${window.__sessionId}`);
+    }
+
+    function startUserTyping() {
+      if (userTypingActive) return;
+      userTypingActive = true;
+      sendUserTypingState('start');
+    }
+
+    function stopUserTyping() {
+      if (!userTypingActive) return;
+      sendUserTypingState('stop');
+      userTypingActive = false;
+    }
+
+    function handleUserTypingInput() {
+      const input = document.getElementById('chat-input');
+      if (input && input.value.trim()) startUserTyping();
+      else stopUserTyping();
     }
 
     document.addEventListener('htmx:afterSwap', (e) => {
       if (e.detail.target.id === 'messages') scrollMessages();
     });
 
+    document.addEventListener('htmx:beforeRequest', (e) => {
+      if (e.detail.elt && e.detail.elt.id === 'chat-form') stopUserTyping();
+    });
+
     function resetChat() {
+      stopUserTyping();
       const oldWs = ws;
       ws = null;
       window.__sessionId = null;
+      userTypingActive = false;
       if (oldWs) oldWs.close();
       const startForm = document.getElementById('start-form');
       const chatContainer = document.getElementById('chat-container');
@@ -349,11 +412,16 @@
             resetChat();
             return;
           }
-          if (message.data.startsWith('typing:supporter:')) {
+          if (message.data.startsWith('typing:supporter:start:')) {
             showSupporterTyping();
             return;
           }
+          if (message.data.startsWith('typing:supporter:stop:')) {
+            hideSupporterTyping();
+            return;
+          }
           if (message.data.startsWith('typing:user:')) return;
+          hideSupporterTyping();
           htmx.trigger('#messages', 'refresh');
         };
         ws.onerror = () => console.warn('WebSocket error; polling will continue.');