chore: initial commit — chat-saiden web chat baseline

This commit is contained in:
marauder-actual
2026-05-29 13:47:34 +02:00
commit 96ba8f4b6e
28 changed files with 4852 additions and 0 deletions
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/* chat.saiden.dev
*
* Default look: clean, generic, neutral chat. Inter, soft grey, no cursive.
* Personality is the result of calibration, not the starting point.
*
* Once calibrated, the body gets data-* attributes:
* data-palette = default | rose | morning | evening | sage | paper | ink
* data-typography = sans | serif-warm | serif-formal | mixed-modern | mono
* data-density = airy | normal | dense
* data-labels = block | cursive | none | prefix
*
* Each combination is a different room.
*/
/* ===================== DEFAULT TOKENS (neutral) ===================== */
:root {
/* surfaces */
--bg: #f4f4f3;
--bg-soft: #ececea;
--surface: #e3e3e1;
/* text */
--ink: #1f2024;
--ink-muted: #6a6a6f;
--ink-faint: #a8a8ac;
/* accents (low-saturation by default) */
--coral: #6a6a6f; /* default accent is neutral grey */
--red: #8a4a3e;
--gold: #9a8460;
/* lines */
--line: #d6d6d3;
/* font stacks (default = sans-only) */
--serif: 'Source Serif Pro', Georgia, serif;
--serif-warm: 'Cormorant Garamond', Georgia, serif;
--hand: 'Caveat', 'Brush Script MT', cursive;
--sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
--mono: 'JetBrains Mono', Menlo, monospace;
/* derived families — overridden by data-typography */
--font-body: var(--sans);
--font-label: var(--sans);
/* spacing scale — overridden by data-density */
--msg-gap: 1.5rem;
--max-col: 36rem;
--body-size: 1rem;
--label-size: 0.72rem;
--bt-size: 1.05rem;
/* prompt baseline */
--line-thickness: 1px;
}
/* ===================== PALETTES ===================== */
body[data-palette="rose"] {
--bg: #f5ebe0;
--bg-soft: #f8e8db;
--surface: #f0d9c7;
--ink: #3d2820;
--ink-muted: #8b6f60;
--ink-faint: #b89a87;
--coral: #e07856;
--red: #c54f3d;
--line: #e8d4c0;
}
body[data-palette="morning"] {
--bg: #faf3e3;
--bg-soft: #f4ead0;
--surface: #ecdfb8;
--ink: #3a2f1a;
--ink-muted: #7a6a4a;
--ink-faint: #b6a684;
--coral: #d99b4a;
--red: #b5703a;
--line: #e7d6a8;
}
body[data-palette="evening"] {
--bg: #ece1de;
--bg-soft: #e4d2cd;
--surface: #d8bdb6;
--ink: #2e1b1d;
--ink-muted: #7d5a59;
--ink-faint: #b08c8a;
--coral: #b04a55;
--red: #84313e;
--line: #d6bbb6;
}
body[data-palette="sage"] {
--bg: #ecede4;
--bg-soft: #e1e3d4;
--surface: #cdd1bd;
--ink: #25291e;
--ink-muted: #5d6451;
--ink-faint: #97a085;
--coral: #6f8861;
--red: #58683f;
--line: #cfd4be;
}
body[data-palette="paper"] {
--bg: #f7f4ed;
--bg-soft: #efeada;
--surface: #e1d9c2;
--ink: #1d1c19;
--ink-muted: #6b6759;
--ink-faint: #a8a292;
--coral: #8b5d2f;
--red: #6a3f1b;
--line: #d8cfb6;
}
body[data-palette="ink"] {
--bg: #1d1d1f;
--bg-soft: #26262a;
--surface: #2f2f34;
--ink: #e8e6df;
--ink-muted: #9d9a90;
--ink-faint: #65635c;
--coral: #d8a572;
--red: #b87653;
--line: #353539;
}
/* ===================== TYPOGRAPHY SETS ===================== */
body[data-typography="sans"] {
--font-body: var(--sans);
--font-label: var(--sans);
}
body[data-typography="serif-warm"] {
--font-body: var(--serif-warm);
--font-label: var(--hand);
--bt-size: 1.25rem;
}
body[data-typography="serif-formal"] {
--font-body: var(--serif);
--font-label: var(--sans);
--bt-size: 1.15rem;
}
body[data-typography="mixed-modern"] {
--font-body: var(--sans);
--font-label: var(--hand);
}
body[data-typography="mono"] {
--font-body: var(--mono);
--font-label: var(--mono);
--bt-size: 0.95rem;
}
/* ===================== DENSITY ===================== */
body[data-density="airy"] { --msg-gap: 2.3rem; --max-col: 38rem; --body-size: 1.05rem; }
body[data-density="normal"] { --msg-gap: 1.5rem; --max-col: 36rem; --body-size: 1rem; }
body[data-density="dense"] { --msg-gap: 1rem; --max-col: 34rem; --body-size: 0.95rem; }
/* ===================== RESET ===================== */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html {
font-size: 16px;
-webkit-font-smoothing: antialiased;
-moz-osx-font-smoothing: grayscale;
text-rendering: optimizeLegibility;
}
body {
background: var(--bg);
color: var(--ink);
font-family: var(--font-body);
font-weight: 400;
font-size: var(--body-size);
line-height: 1.55;
min-height: 100vh;
}
/* ===================== LAYOUT ===================== */
.page {
max-width: var(--max-col);
margin: 0 auto;
padding: 3rem 1.5rem 0 1.5rem;
position: relative;
min-height: 100vh;
display: flex;
flex-direction: column;
}
/* ---------- top-nav strip (recalibrate · sign out · sigil) ---------- */
.topnav {
position: fixed;
top: 1.25rem;
right: 1.25rem;
display: flex;
align-items: center;
gap: 0.75rem;
z-index: 10;
}
.topnav__link {
font-family: var(--sans);
font-size: 0.62rem;
font-weight: 400;
letter-spacing: 0.16em;
text-transform: uppercase;
color: var(--ink-faint);
text-decoration: none;
background: transparent;
border: none;
padding: 0;
cursor: pointer;
opacity: 0.45;
transition: opacity 400ms ease, color 400ms ease;
}
.topnav__link:hover,
.topnav__link:focus-visible {
opacity: 1;
color: var(--ink);
outline: none;
}
.topnav__link:disabled {
opacity: 0.25;
cursor: progress;
}
.topnav__sep {
color: var(--ink-faint);
opacity: 0.35;
font-size: 0.7rem;
}
.sigil {
width: 14px;
height: 14px;
opacity: 0.35;
transition: opacity 600ms ease;
user-select: none;
margin-left: 0.4rem;
}
.sigil:hover { opacity: 0.85; }
.sigil img { width: 100%; height: 100%; display: block; }
/* ===================== CONVERSATION ===================== */
.conversation {
flex: 1 0 auto;
padding-bottom: 2rem;
}
.msg {
margin: var(--msg-gap) 0;
opacity: 0;
transform: translateY(6px);
animation: appear 500ms cubic-bezier(0.16, 1, 0.3, 1) forwards;
}
.msg__label {
font-family: var(--font-label);
font-weight: 400;
color: var(--ink-muted);
font-size: var(--label-size);
letter-spacing: 0.14em;
text-transform: uppercase;
margin-bottom: 0.45rem;
user-select: none;
}
/* Cursive label override */
body[data-labels="cursive"] .msg__label {
font-family: var(--hand);
font-size: 1rem;
letter-spacing: 0.01em;
text-transform: none;
}
body[data-labels="none"] .msg__label { display: none; }
body[data-labels="prefix"] .msg__label {
display: inline;
margin-right: 0.5em;
font-weight: 600;
text-transform: none;
}
.msg__body {
color: var(--ink);
font-size: var(--bt-size);
line-height: 1.6;
white-space: pre-wrap;
word-wrap: break-word;
}
.msg--user .msg__body {
color: var(--ink-muted);
font-size: var(--body-size);
line-height: 1.55;
}
.msg--system .msg__body {
color: var(--ink-faint);
font-size: 0.74rem;
text-transform: uppercase;
letter-spacing: 0.16em;
font-family: var(--sans);
font-weight: 300;
}
.msg--system .msg__label { display: none; }
.msg--calibration .msg__body {
color: var(--ink);
font-size: calc(var(--bt-size) * 1.02);
font-style: italic;
line-height: 1.65;
}
.msg--calibration .msg__label { display: none; }
.msg--calibration { margin: 1.5rem 0; }
/* repeat-label hide */
.msg[data-hide-label="true"] .msg__label { display: none; }
.msg[data-hide-label="true"] { margin-top: 0.8rem; }
/* ===================== THINKING ===================== */
.thinking {
color: var(--coral);
font-size: 0.65rem;
margin: 1.5rem 0;
user-select: none;
animation: pulse 1.8s ease-in-out infinite;
}
.thinking::before { content: "●"; }
@keyframes pulse {
0%, 100% { opacity: 0.30; }
50% { opacity: 1.0; }
}
@keyframes appear {
to { opacity: 1; transform: translateY(0); }
}
/* typewriter cursor */
.caret {
display: inline-block;
width: 0.5ch;
margin-left: 0.05ch;
color: var(--coral);
animation: caret 800ms ease-out forwards;
}
.caret::after { content: "▍"; }
@keyframes caret {
0% { opacity: 1; }
100% { opacity: 0; }
}
/* ===================== PROMPT ===================== */
.prompt {
position: sticky;
bottom: 0;
background: var(--bg);
padding: 1.5rem 0 2.5rem 0;
z-index: 5;
}
.prompt__line {
border: none;
border-top: var(--line-thickness) solid var(--line);
margin: 0 0 0.85rem 0;
}
.prompt__row {
display: flex;
align-items: center;
gap: 0.75rem;
}
.prompt__input {
flex: 1;
border: none;
background: transparent;
outline: none;
font-family: var(--font-body);
font-weight: 400;
font-size: var(--body-size);
color: var(--ink);
padding: 0;
min-width: 0;
}
.prompt__input::placeholder {
color: var(--ink-faint);
font-style: italic;
}
.prompt__input:focus { caret-color: var(--coral); }
/* ===================== MIC ===================== */
.prompt__mic {
background: transparent;
border: none;
cursor: pointer;
color: var(--ink-faint);
padding: 0.4rem;
display: flex;
align-items: center;
justify-content: center;
border-radius: 50%;
transition: color 200ms ease, background 200ms ease, transform 200ms ease;
}
.prompt__mic:hover { color: var(--ink-muted); }
.prompt__mic:active { transform: scale(0.95); }
.prompt__mic.recording {
color: var(--coral);
background: rgba(0, 0, 0, 0.04);
animation: mic-pulse 1.2s ease-in-out infinite;
}
.prompt__mic.transcribing {
color: var(--gold);
animation: mic-spin 1.2s linear infinite;
}
.prompt__mic.empty {
color: var(--red);
animation: mic-empty 0.7s ease;
}
@keyframes mic-pulse {
0%, 100% { box-shadow: 0 0 0 0 rgba(0, 0, 0, 0.18); }
50% { box-shadow: 0 0 0 8px rgba(0, 0, 0, 0); }
}
@keyframes mic-spin { to { transform: rotate(360deg); } }
@keyframes mic-empty {
0% { transform: translateX(0); }
20% { transform: translateX(-2px); }
40% { transform: translateX(2px); }
60% { transform: translateX(-2px); }
80% { transform: translateX(2px); }
100% { transform: translateX(0); }
}
/* ===================== CHOICE TILES ===================== */
.choices {
display: flex;
flex-wrap: wrap;
gap: 0.55rem;
margin: 1rem 0 0.25rem 0;
}
.choice {
background: var(--bg-soft);
border: 1px solid var(--line);
color: var(--ink);
font-family: var(--font-body);
font-size: 0.95rem;
font-style: normal;
padding: 0.5rem 0.95rem;
border-radius: 999px;
cursor: pointer;
display: inline-flex;
align-items: center;
gap: 0.45rem;
transition: background 220ms ease, color 220ms ease,
border-color 220ms ease, transform 220ms ease, opacity 220ms ease;
}
.choice:hover {
background: var(--surface);
border-color: var(--coral);
}
.choice:active { transform: scale(0.97); }
.choice:disabled { cursor: default; opacity: 0.45; }
.choice--selected {
background: var(--coral);
color: var(--bg);
border-color: var(--coral);
opacity: 1 !important;
}
.choice--other {
font-style: italic;
color: var(--ink-muted);
background: transparent;
}
.choice__icon { font-size: 1.05rem; line-height: 1; display: inline-flex; }
.choice__label { line-height: 1; }
/* ===================== DENIED PAGE ===================== */
.denied {
display: flex;
flex-direction: column;
align-items: center;
justify-content: center;
min-height: 100vh;
padding: 2rem;
text-align: center;
}
.denied__title {
font-family: var(--font-body);
font-size: 1.7rem;
color: var(--ink);
font-weight: 500;
margin: 0 0 1rem 0;
}
.denied__body {
font-family: var(--font-body);
font-size: 1rem;
color: var(--ink-muted);
max-width: 28rem;
line-height: 1.6;
}
.denied__link {
font-family: var(--sans);
font-size: 0.78rem;
text-transform: uppercase;
letter-spacing: 0.14em;
color: var(--red);
text-decoration: none;
margin-top: 3rem;
display: inline-block;
border-bottom: 1px solid var(--line);
padding-bottom: 0.15rem;
}
.denied__link:hover { border-color: var(--red); }
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/* chat.saiden.dev — frontend
*
* Minimal vanilla JS. WS connects to /ws, sends {content}, receives
* {role, delta, done} chunks. Streams into a typewriter queue.
*
* Design rules (see UI-PLAN.md):
* - Speaker labels only appear when speaker changes from the previous message.
* - Pilot's outbound messages render instantly. BT's stream via typewriter.
* - One coral pulsing dot while waiting. Cursor fades when stream completes.
*/
const TYPEWRITER_MS = 22; // ~45 chars/sec
const SCROLL_EASE_MS = 600;
const $ = (sel) => document.querySelector(sel);
const $conversation = $('#conversation');
const $form = $('#prompt-form');
const $input = $('#prompt-input');
let ws = null;
let connectAttempts = 0;
let lastSpeaker = null; // 'user' | 'bt' | 'system' | null
let currentBtBody = null; // active streaming .msg__body element
let queue = [];
let draining = false;
// ---------- helpers ----------
function speakerLabel(role) {
if (role === 'user') return window.__pilotName || 'Pilot';
if (role === 'bt') return window.__personaName || 'BT';
if (role === 'calibration') return '—';
return 'channel';
}
function makeMsg(role) {
const repeat = role === lastSpeaker;
const msg = document.createElement('article');
msg.className = `msg msg--${role}`;
if (repeat) msg.setAttribute('data-hide-label', 'true');
const label = document.createElement('div');
label.className = 'msg__label';
label.textContent = speakerLabel(role);
msg.appendChild(label);
const body = document.createElement('div');
body.className = 'msg__body';
msg.appendChild(body);
$conversation.appendChild(msg);
lastSpeaker = role;
scrollToBottom();
return body;
}
function smoothScrollTo(target) {
const start = window.scrollY;
const dist = target - start;
const t0 = performance.now();
function step(now) {
const t = Math.min(1, (now - t0) / SCROLL_EASE_MS);
const eased = 1 - Math.pow(1 - t, 3);
window.scrollTo(0, start + dist * eased);
if (t < 1) requestAnimationFrame(step);
}
requestAnimationFrame(step);
}
function scrollToBottom() {
const target = document.documentElement.scrollHeight - window.innerHeight;
smoothScrollTo(target);
}
function showThinking() {
removeThinking();
const dot = document.createElement('div');
dot.className = 'thinking';
dot.id = 'thinking';
$conversation.appendChild(dot);
scrollToBottom();
}
function removeThinking() {
const t = document.getElementById('thinking');
if (t) t.remove();
}
// ---------- typewriter ----------
function enqueue(text) {
for (const ch of text) queue.push(ch);
if (!draining) drain();
}
async function drain() {
if (!currentBtBody) return;
draining = true;
while (queue.length) {
currentBtBody.textContent += queue.shift();
if (Math.random() < 0.04) scrollToBottom();
await sleep(TYPEWRITER_MS);
}
draining = false;
}
function sleep(ms) { return new Promise(r => setTimeout(r, ms)); }
function finishBt() {
// wait for the queue to drain before adding caret
const tick = () => {
if (draining || queue.length) { setTimeout(tick, 30); return; }
if (!currentBtBody) return;
const caret = document.createElement('span');
caret.className = 'caret';
currentBtBody.appendChild(caret);
scrollToBottom();
setTimeout(() => caret.remove(), 900);
currentBtBody = null;
};
tick();
}
// ---------- ws ----------
function connect() {
const proto = location.protocol === 'https:' ? 'wss:' : 'ws:';
ws = new WebSocket(`${proto}//${location.host}/ws`);
ws.addEventListener('open', () => {
connectAttempts = 0;
});
ws.addEventListener('message', (e) => {
let msg;
try { msg = JSON.parse(e.data); } catch { return; }
handleMessage(msg);
});
ws.addEventListener('close', (e) => {
if (e.code === 4401) {
// session expired — say so softly, but DO NOT navigate the page away.
// The Pilot decides when to refresh.
const body = makeMsg('system');
body.textContent = 'session lost — refresh when ready';
return;
}
// try a gentle reconnect, with a hard cap so we don't spam forever
connectAttempts++;
if (connectAttempts > 6) return;
const delay = Math.min(8000, 600 * connectAttempts);
setTimeout(connect, delay);
});
}
function handleMessage(msg) {
if (msg.role === 'system') {
const body = makeMsg('system');
body.textContent = msg.content || '';
return;
}
if (msg.role === 'calibration') {
removeThinking();
const body = makeMsg('calibration');
body.textContent = msg.content || '';
if (Array.isArray(msg.choices) && msg.choices.length) {
renderChoices(body.parentElement, msg.choices);
}
return;
}
if (msg.role === 'calibration_done') {
// Transition in place — no reload.
if (msg.persona_name) window.__personaName = msg.persona_name;
if (msg.operator_name) window.__pilotName = msg.operator_name;
if (msg.ui_palette) document.body.setAttribute('data-palette', msg.ui_palette);
if (msg.ui_typography) document.body.setAttribute('data-typography', msg.ui_typography);
if (msg.ui_density) document.body.setAttribute('data-density', msg.ui_density);
if (msg.ui_labels) document.body.setAttribute('data-labels', msg.ui_labels);
if (msg.persona_name) {
$input.setAttribute('placeholder', `speak to ${msg.persona_name}`);
}
return;
}
if (msg.role === 'assistant') {
if (!currentBtBody) {
removeThinking();
currentBtBody = makeMsg('bt');
}
if (msg.delta) enqueue(msg.delta);
if (msg.done) finishBt();
}
if (msg.role === 'audio' && msg.data) {
playAudio(msg.mime || 'audio/wav', msg.data);
}
}
// ---------- audio ----------
let currentAudio = null;
function playAudio(mime, b64) {
// stop any in-flight playback first — last word wins
if (currentAudio) {
try { currentAudio.pause(); } catch {}
currentAudio = null;
}
const audio = new Audio(`data:${mime};base64,${b64}`);
audio.volume = 0.9;
audio.play().catch(err => {
// autoplay may be blocked until first user gesture — gracefully degrade
console.warn('audio autoplay blocked:', err.message);
});
currentAudio = audio;
}
// ---------- form ----------
$form.addEventListener('submit', (e) => {
e.preventDefault();
const text = $input.value.trim();
if (!text) return;
if (!ws || ws.readyState !== WebSocket.OPEN) return;
const body = makeMsg('user');
body.textContent = text;
ws.send(JSON.stringify({ content: text }));
$input.value = '';
showThinking();
});
// Cmd+K / Ctrl+K to refocus input
document.addEventListener('keydown', (e) => {
if ((e.metaKey || e.ctrlKey) && e.key === 'k') {
e.preventDefault();
$input.focus();
}
});
// ---------- voice input (whisper) ----------
const $mic = document.getElementById('mic-button');
let mediaRecorder = null;
let recordedChunks = [];
let recording = false;
async function startRecording() {
try {
const stream = await navigator.mediaDevices.getUserMedia({ audio: true });
recordedChunks = [];
// Prefer webm/opus if browser supports it (Chrome/FF). Safari may need fallback.
const mimeTypes = ['audio/webm;codecs=opus', 'audio/webm', 'audio/mp4', ''];
const mime = mimeTypes.find(m => !m || MediaRecorder.isTypeSupported(m)) || '';
mediaRecorder = new MediaRecorder(stream, mime ? { mimeType: mime } : undefined);
mediaRecorder.addEventListener('dataavailable', (e) => {
if (e.data && e.data.size > 0) recordedChunks.push(e.data);
});
mediaRecorder.addEventListener('stop', () => {
// release the mic immediately
stream.getTracks().forEach(t => t.stop());
handleRecorded();
});
mediaRecorder.start();
recording = true;
$mic.classList.add('recording');
} catch (err) {
console.warn('microphone unavailable:', err.message);
recording = false;
}
}
function stopRecording() {
if (!mediaRecorder || mediaRecorder.state === 'inactive') return;
mediaRecorder.stop();
recording = false;
$mic.classList.remove('recording');
$mic.classList.add('transcribing');
}
async function handleRecorded() {
if (!recordedChunks.length) {
$mic.classList.remove('transcribing');
return;
}
const blob = new Blob(recordedChunks, { type: recordedChunks[0].type || 'audio/webm' });
const ext = (blob.type.split('/')[1] || 'webm').split(';')[0];
const form = new FormData();
form.append('audio', blob, `speech.${ext}`);
try {
const resp = await fetch('/api/transcribe', { method: 'POST', body: form });
if (!resp.ok) throw new Error(`HTTP ${resp.status}`);
const { text } = await resp.json();
if (text && text.trim()) {
$input.value = text;
// auto-send — Her vibe is "speak and she hears"
$form.dispatchEvent(new Event('submit', { cancelable: true }));
} else {
flashMicEmpty();
}
} catch (err) {
console.warn('transcription failed:', err.message);
flashMicEmpty();
} finally {
$mic.classList.remove('transcribing');
}
}
function flashMicEmpty() {
// brief visual hint that nothing was heard — no toast, no popup, just a flash
$mic.classList.add('empty');
setTimeout(() => $mic.classList.remove('empty'), 700);
}
// ---------- calibration choice tiles ----------
function renderChoices(parentEl, choices) {
const wrap = document.createElement('div');
wrap.className = 'choices';
for (const c of choices) {
const tile = document.createElement('button');
tile.type = 'button';
tile.className = 'choice';
if (c.value === '__other__') tile.classList.add('choice--other');
if (c.icon) {
const icon = document.createElement('span');
icon.className = 'choice__icon';
icon.textContent = c.icon;
tile.appendChild(icon);
}
const label = document.createElement('span');
label.className = 'choice__label';
label.textContent = c.label;
tile.appendChild(label);
tile.addEventListener('click', () => {
// disable all tiles in this group
wrap.querySelectorAll('.choice').forEach(b => b.disabled = true);
tile.classList.add('choice--selected');
if (c.value === '__other__') {
// remove tiles, focus input so the operator types freely
wrap.remove();
$input.focus();
return;
}
sendChoice(c.label, c.value);
// collapse tiles into a faint chosen tag
setTimeout(() => wrap.remove(), 200);
});
wrap.appendChild(tile);
}
parentEl.appendChild(wrap);
scrollToBottom();
}
function sendChoice(label, value) {
if (!ws || ws.readyState !== WebSocket.OPEN) return;
// Render as a "Pilot" message using the human-readable label
const body = makeMsg('user');
body.textContent = label;
// Send the machine value to the server
ws.send(JSON.stringify({ content: value }));
showThinking();
}
function toggleMic() {
if (recording) stopRecording();
else startRecording();
}
$mic.addEventListener('click', toggleMic);
// Hold-space-to-talk when input is NOT focused (so typing space still works)
document.addEventListener('keydown', (e) => {
if (e.code !== 'Space') return;
if (document.activeElement === $input) return;
if (e.repeat) return;
e.preventDefault();
if (!recording) startRecording();
});
document.addEventListener('keyup', (e) => {
if (e.code !== 'Space') return;
if (recording) stopRecording();
});
// ---------- recalibrate ----------
const $recal = document.getElementById('recalibrate-btn');
if ($recal) {
$recal.addEventListener('click', async () => {
if ($recal.disabled) return;
$recal.disabled = true;
$recal.textContent = 'resetting…';
try {
const resp = await fetch('/api/recalibrate', { method: 'POST' });
if (!resp.ok) throw new Error(`HTTP ${resp.status}`);
// explicit reset is user-driven — reload is appropriate here
location.reload();
} catch (err) {
console.warn('recalibrate failed:', err.message);
$recal.textContent = 'recalibrate';
$recal.disabled = false;
}
});
}
// ---------- init ----------
connect();
$input.focus();