start frontend

static/css/chat.css

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+:root {
+    color-scheme: light;
+    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
+}
+
+* {
+    box-sizing: border-box;
+}
+
+html,
+body {
+    height: 100%;
+}
+
+body {
+    margin: 0;
+    padding: 0;
+    background: #f7f8fa;
+    color: #1f2937;
+}
+
+.app {
+    display: flex;
+    width: 100vw;
+    height: 100vh;
+    overflow: hidden;
+}
+
+.chat {
+    flex: 1;
+    height: 100%;
+    margin: 0;
+    background: #ffffff;
+    border: 1px solid #e5e7eb;
+    border-radius: 0;
+    display: flex;
+    flex-direction: column;
+}
+
+.chat__header {
+    padding: 16px 20px;
+    border-bottom: 1px solid #e5e7eb;
+    font-weight: 600;
+    background: #f9fafb;
+    display: flex;
+    align-items: center;
+    justify-content: space-between;
+    gap: 12px;
+}
+
+.chat__settings {
+    padding: 6px 12px;
+    border-radius: 999px;
+    border: 1px solid #d1d5db;
+    background: #ffffff;
+    color: #1f2937;
+    font-weight: 600;
+    font-size: 13px;
+    cursor: pointer;
+}
+
+.chat__settings:hover {
+    background: #f3f4f6;
+}
+
+.chat__messages {
+    flex: 1;
+    padding: 16px 20px;
+    overflow-y: auto;
+    display: flex;
+    flex-direction: column;
+    gap: 10px;
+}
+
+.message {
+    max-width: 70%;
+    padding: 10px 12px;
+    border-radius: 12px;
+    line-height: 1.4;
+    font-size: 14px;
+    word-wrap: break-word;
+    white-space: pre-wrap;
+}
+
+.message--out {
+    align-self: flex-end;
+    background: #2563eb;
+    color: #ffffff;
+}
+
+.message--in {
+    align-self: flex-start;
+    background: #f3f4f6;
+    color: #111827;
+}
+
+.chat__footer {
+    padding: 16px 20px;
+    border-top: 1px solid #e5e7eb;
+    display: flex;
+    gap: 12px;
+    background: #f9fafb;
+}
+
+.chat__input {
+    flex: 1;
+    padding: 10px 12px;
+    border-radius: 8px;
+    border: 1px solid #d1d5db;
+    background: #ffffff;
+    color: #111827;
+}
+
+.chat__input::placeholder {
+    color: #9ca3af;
+}
+
+.chat__button {
+    padding: 10px 16px;
+    border-radius: 8px;
+    border: none;
+    background: #2563eb;
+    color: #ffffff;
+    font-weight: 600;
+    cursor: pointer;
+}
+
+.chat__status {
+    padding: 8px 20px 0;
+    font-size: 12px;
+    color: #6b7280;
+}
+
+.drawer {
+    width: 320px;
+    max-width: 100%;
+    height: 100%;
+    border-left: 1px solid #e5e7eb;
+    background: #ffffff;
+    padding: 20px;
+    display: flex;
+    flex-direction: column;
+    gap: 16px;
+    transform: translateX(100%);
+    transition: transform 0.25s ease;
+}
+
+.drawer--open {
+    transform: translateX(0%);
+}
+
+.drawer__header {
+    display: flex;
+    align-items: center;
+    justify-content: space-between;
+    gap: 12px;
+}
+
+.drawer__title {
+    margin: 0;
+    font-size: 18px;
+}
+
+.drawer__close {
+    border: 1px solid #d1d5db;
+    background: #ffffff;
+    border-radius: 8px;
+    padding: 4px 8px;
+    cursor: pointer;
+}
+
+.drawer__form {
+    display: flex;
+    flex-direction: column;
+    gap: 16px;
+}
+
+.drawer__field {
+    display: grid;
+    grid-template-columns: 1fr auto;
+    grid-template-rows: auto auto;
+    gap: 6px 12px;
+    align-items: center;
+    font-size: 13px;
+    color: #1f2937;
+}
+
+.drawer__label {
+    font-weight: 600;
+}
+
+.drawer__range {
+    grid-column: 1 / -1;
+    width: 100%;
+}
+
+.drawer__value {
+    font-variant-numeric: tabular-nums;
+}
+
+.drawer__hint {
+    margin: 0;
+    font-size: 12px;
+    color: #6b7280;
+}
+
+@media (max-width: 900px) {
+    .drawer {
+        position: absolute;
+        right: 0;
+        top: 0;
+        height: 100vh;
+        box-shadow: -12px 0 24px rgba(15, 23, 42, 0.08);
+    }
+}

static/js/chat.js

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+const statusEl = document.getElementById("status");
+const messagesEl = document.getElementById("messages");
+const formEl = document.getElementById("chat-form");
+const inputEl = document.getElementById("chat-input");
+const settingsToggle = document.getElementById("settings-toggle");
+const settingsDrawer = document.getElementById("settings-drawer");
+const settingsClose = document.getElementById("settings-close");
+const rangeInputs = settingsDrawer
+    ? Array.from(settingsDrawer.querySelectorAll("input[type='range']"))
+    : [];
+
+const scheme = window.location.protocol === "https:" ? "wss" : "ws";
+const socketUrl = `${scheme}://${window.location.host}/ws`;
+let socket;
+let streamingBubble = null;
+
+const addMessage = (text, direction) => {
+    const bubble = document.createElement("div");
+    bubble.className = `message message--${direction}`;
+    bubble.textContent = text;
+    messagesEl.appendChild(bubble);
+    messagesEl.scrollTop = messagesEl.scrollHeight;
+};
+
+const connect = () => {
+    socket = new WebSocket(socketUrl);
+
+    socket.addEventListener("open", () => {
+        statusEl.textContent = "Connected";
+    });
+
+    socket.addEventListener("message", (event) => {
+        let payload;
+        try {
+            payload = JSON.parse(event.data);
+        } catch (error) {
+            addMessage(event.data, "in");
+            return;
+        }
+
+        if (payload.type === "start") {
+            streamingBubble = document.createElement("div");
+            streamingBubble.className = "message message--in";
+            streamingBubble.textContent = "";
+            messagesEl.appendChild(streamingBubble);
+            messagesEl.scrollTop = messagesEl.scrollHeight;
+            return;
+        }
+
+        if (payload.type === "chunk") {
+            if (!streamingBubble) {
+                streamingBubble = document.createElement("div");
+                streamingBubble.className = "message message--in";
+                messagesEl.appendChild(streamingBubble);
+            }
+            streamingBubble.textContent += payload.data ?? "";
+            messagesEl.scrollTop = messagesEl.scrollHeight;
+            return;
+        }
+
+        if (payload.type === "end") {
+            streamingBubble = null;
+            return;
+        }
+    });
+
+    socket.addEventListener("close", () => {
+        statusEl.textContent = "Disconnected";
+    });
+
+    socket.addEventListener("error", () => {
+        statusEl.textContent = "Connection error";
+    });
+};
+
+const updateDrawerValue = (input) => {
+    const output = input.parentElement?.querySelector(".drawer__value");
+    if (!output) return;
+    output.textContent = input.value;
+};
+
+rangeInputs.forEach((input) => {
+    updateDrawerValue(input);
+    input.addEventListener("input", () => updateDrawerValue(input));
+});
+
+const closeDrawer = () => {
+    settingsDrawer?.classList.remove("drawer--open");
+    if (settingsDrawer) settingsDrawer.setAttribute("aria-hidden", "true");
+    if (settingsToggle) settingsToggle.setAttribute("aria-expanded", "false");
+};
+
+const openDrawer = () => {
+    settingsDrawer?.classList.add("drawer--open");
+    if (settingsDrawer) settingsDrawer.setAttribute("aria-hidden", "false");
+    if (settingsToggle) settingsToggle.setAttribute("aria-expanded", "true");
+};
+
+settingsToggle?.addEventListener("click", () => {
+    if (settingsDrawer?.classList.contains("drawer--open")) {
+        closeDrawer();
+    } else {
+        openDrawer();
+    }
+});
+
+settingsClose?.addEventListener("click", closeDrawer);
+
+formEl.addEventListener("submit", (event) => {
+    event.preventDefault();
+    const text = inputEl.value.trim();
+    if (!text) return;
+    if (!socket || socket.readyState !== WebSocket.OPEN) {
+        addMessage("Not connected.", "in");
+        return;
+    }
+    addMessage(text, "out");
+    socket.send(text);
+    inputEl.value = "";
+    inputEl.focus();
+});
+
+connect();