feat(ui): 3D scenes, mobile-first layout, portfolio charts

Three WebGL scenes on one renderer and one context, since a phone should not allocate a context per game: a rocket straining against gravity, a decaying orbit, and a tower that sways harder the higher it stacks. The loop stops when the tab is hidden. Navigation moves to the bottom, where a thumb already is. New Stats view with balance history, cash-out rate, and a distribution chart that plots observed crash points against what the published maths predicts — the honest version of a hot-numbers board. Charts are hand-built SVG, ~300 lines, rather than a library that would cost more to load than the 3D engine. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
feat(pqid): hybrid post-quantum identity, AGPL-3.0 license
2026-08-05 22:26:35 +00:00 · 2026-08-05 22:17:54 +00:00
12 changed files with 2212 additions and 191 deletions
--- a/661
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 solutions will be better for different programs; see section 13 for the
 specific requirements.
  You should also get your employer (if you work as a programmer) or school,
 if any, to sign a "copyright disclaimer" for the program, if necessary.
 For more information on this, and how to apply and follow the GNU AGPL, see
 <https://www.gnu.org/licenses/>.
--- a/cmd/arcade/static/app.js
+++ b/cmd/arcade/static/app.js
@@ -1,7 +1,7 @@
 /* Quantum Arcade client.
 *
- * Identity is an ed25519 keypair generated in the browser and kept in
+ * Identity is a keypair generated in the browser and kept in localStorage.
- * localStorage. There is no account to create and no password to lose.
+ * There is no account to create and no password to lose.
 *
 * The verifier recomputes round outcomes locally with WebCrypto. It never asks
 * the server whether a round was fair — it checks.
@@ -10,10 +10,14 @@
 * Nothing that originates from another player (nicknames, keys) or from the
 * server ever reaches innerHTML. */
 import { Arcade3D } from '/scene3d.js';
 import * as charts from '/charts.js';
 const KEY_STORAGE = 'quantum-arcade-key';
 const NAME_STORAGE = 'quantum-arcade-name';
 const STATS_STORAGE = 'quantum-arcade-stats';
-let keypair = null;      // { publicKeyHex, privateKey (CryptoKey) }
+let keypair = null;
 let token = null;
 let nickname = '';
 let stake = 5000;          // millisatoshis
@@ -21,6 +25,38 @@ let currentGame = 'rocket';
 let socket = null;
 let snapshot = null;
 let myBet = null;          // 'in' | 'out' | null
 let scene = null;
 let balanceMsat = 0;
 /* Session statistics, kept client-side. The ledger remains the authority on
 * money; this is only for the charts. */
 const stats = loadStats();
 function loadStats() {
  try {
    const raw = JSON.parse(localStorage.getItem(STATS_STORAGE) || '{}');
    return {
      crashes: raw.crashes || [],       // crash points seen, for distribution
      balances: raw.balances || [],     // balance samples over time
      wagered: raw.wagered || 0,
      plays: raw.plays || 0,
      wins: raw.wins || 0,
      losses: raw.losses || 0,
      best: raw.best || 0,
      sessionStart: null,               // set at sign-in, never persisted
    };
  } catch {
    return { crashes: [], balances: [], wagered: 0, plays: 0,
             wins: 0, losses: 0, best: 0, sessionStart: null };
  }
 }
 function saveStats() {
  // Cap the arrays so localStorage cannot grow without bound over a long night.
  stats.crashes = stats.crashes.slice(-300);
  stats.balances = stats.balances.slice(-300);
  localStorage.setItem(STATS_STORAGE, JSON.stringify(stats));
 }
 const $ = (id) => document.getElementById(id);
 const sats = (msat) => Math.round(msat / 1000).toLocaleString();
@@ -44,6 +80,11 @@ function clear(node) {
  while (node.firstChild) node.removeChild(node.firstChild);
 }
 /* A short haptic tap. Phones only, and silently absent elsewhere. */
 function buzz(ms) {
  if (navigator.vibrate) navigator.vibrate(ms);
 }
 /* ---------------- identity ---------------- */
 async function loadOrCreateKey() {
@@ -88,10 +129,16 @@ async function signIn() {
  $('signin').hidden = true;
  $('app').hidden = false;
  $('tabs').hidden = false;
  $('balance-wrap').hidden = false;
  setBalance(res.balance_msat);
  stats.sessionStart = res.balance_msat;
  $('pubkey').textContent = keypair.publicKeyHex;
  scene = new Arcade3D($('scene'));
  scene.setGame(currentGame);
  scene.start();
  connect(currentGame);
  loadScratch();
 }
@@ -102,8 +149,7 @@ async function api(method, path, body) {
  const headers = { 'Content-Type': 'application/json' };
  if (token) headers['Authorization'] = 'Bearer ' + token;
  const res = await fetch(path, {
-    method,
+    method, headers,
    headers,
    body: body ? JSON.stringify(body) : undefined,
  });
  const data = await res.json().catch(() => ({}));
@@ -112,11 +158,17 @@ async function api(method, path, body) {
 }
 function setBalance(msat) {
  balanceMsat = msat;
  $('balance').textContent = sats(msat);
  const last = stats.balances[stats.balances.length - 1];
  if (last !== msat) {
    stats.balances.push(msat);
    saveStats();
  }
 }
-/* Reads the auto cash-out box. Returns 0 when empty or invalid, which the
+/* ---------------- auto cash-out ---------------- */
- * server treats as "no target". */
+
 function autoTarget() {
  const v = parseFloat($('auto-target').value);
  return Number.isFinite(v) && v > 1 ? v : 0;
@@ -132,6 +184,7 @@ function connect(game) {
  if (socket) socket.close();
  currentGame = game;
  myBet = null;
  if (scene) scene.setGame(game);
  const proto = location.protocol === 'https:' ? 'wss' : 'ws';
  socket = new WebSocket(`${proto}://${location.host}/ws/${game}`);
  socket.onmessage = (ev) => onSnapshot(JSON.parse(ev.data));
@@ -140,37 +193,54 @@ function connect(game) {
 function onSnapshot(s) {
  const roundChanged = !snapshot || snapshot.round_id !== s.round_id;
  const wasSettled = snapshot && snapshot.state === 'settled';
  snapshot = s;
  if (roundChanged) myBet = null;
  const mult = $('multiplier');
-  mult.textContent = parseFloat(s.multiplier).toFixed(2) + '×';
+  const current = parseFloat(s.multiplier);
  mult.textContent = current.toFixed(2) + '×';
  mult.className = 'multiplier';
  $('commitment').textContent = s.commitment || '—';
  $('revealed').textContent = s.server_seed || 'sealed until the round ends';
  const potMsat = (s.players || []).reduce((n, p) => n + p.stake_msat, 0);
  $('potline').textContent = potMsat
    ? `${(s.players || []).length} in · ${sats(potMsat)} sats at stake`
    : 'no bets yet';
  // Drive the 3D scene. Progress is log-scaled so the early climb is visible
  // and the tail does not saturate instantly.
  if (scene) {
    scene.setState(Math.log(Math.max(1, current)) / Math.log(25),
                   s.state === 'settled');
  }
  const action = $('action');
  const hint = $('hint');
  switch (s.state) {
    case 'betting_open':
-      $('state').textContent = `betting closes in ${Math.max(0, s.next_phase_in_seconds).toFixed(0)}s`;
+      $('state').textContent =
        `betting closes in ${Math.max(0, s.next_phase_in_seconds).toFixed(0)}s`;
      action.textContent = myBet
        ? (autoTarget() ? `In — auto out at ${autoTarget().toFixed(2)}×` : 'In — good luck')
        : 'Place bet';
      action.className = 'primary big';
      action.disabled = !!myBet;
      break;
    case 'locked':
      $('state').textContent = 'launching';
      action.textContent = 'Launching…';
      action.disabled = true;
      break;
-    case 'running':
+
    case 'running': {
      $('state').textContent = 'in flight';
      if (myBet === 'in') {
-        const payout = stake * parseFloat(s.multiplier);
+        const payout = stake * current;
        action.textContent = `Cash out ${sats(payout)}`;
        action.className = 'primary big cashout';
        action.disabled = false;
@@ -180,21 +250,49 @@ function onSnapshot(s) {
        action.disabled = true;
      }
      break;
-    case 'settled':
+    }
-      if (s.crash_point) mult.textContent = parseFloat(s.crash_point).toFixed(2) + '×';
+
    case 'settled': {
      const crash = s.crash_point ? parseFloat(s.crash_point) : current;
      mult.textContent = crash.toFixed(2) + '×';
      mult.className = myBet === 'out' ? 'multiplier won' : 'multiplier crashed';
      $('state').textContent =
        `crashed — next round in ${Math.max(0, s.next_phase_in_seconds).toFixed(0)}s`;
      action.textContent = 'Next round';
      action.className = 'primary big';
      action.disabled = true;
-      if (myBet === 'in') { hint.textContent = 'Rode it too far.'; hint.className = 'hint bad'; }
+
      // Record the round once, on the transition into settled.
      if (!wasSettled && s.crash_point) {
        stats.crashes.push(crash);
        if (myBet === 'in') {
          stats.losses++;
          hint.textContent = 'Rode it too far.';
          hint.className = 'hint bad';
          buzz(120);
        } else if (myBet === 'out') {
          stats.wins++;
          buzz([30, 40, 30]);
        }
        saveStats();
        renderStrip();
        refreshBalance();
      }
      break;
    }
  }
  renderPlayers(s.players);
-  draw(s);
+}
-  if (s.state === 'running') tone(parseFloat(s.multiplier));
+
 /* The recent-rounds strip under the stage. */
 function renderStrip() {
  const wrap = $('strip');
  clear(wrap);
  for (const c of stats.crashes.slice(-24).reverse()) {
    const cls = c >= 10 ? 'pip high' : c >= 2 ? 'pip mid' : 'pip';
    wrap.appendChild(el('span', { class: cls, text: c.toFixed(2) + '×' }));
  }
 }
 function renderPlayers(players) {
@@ -210,6 +308,13 @@ function renderPlayers(players) {
  }
 }
 async function refreshBalance() {
  try {
    const b = await api('GET', '/api/balance');
    setBalance(b.balance_msat);
  } catch { /* a failed refresh is cosmetic; the ledger is still correct */ }
 }
 async function onAction() {
  const hint = $('hint');
  hint.textContent = '';
@@ -221,14 +326,22 @@ async function onAction() {
        auto_cashout: autoTarget(),
      });
      setBalance(r.balance_msat);
      stats.wagered += stake;
      stats.plays++;
      saveStats();
      myBet = 'in';
      buzz(20);
    } else if (snapshot.state === 'running' && myBet === 'in') {
      const r = await api('POST', '/api/cashout', { game: currentGame });
      myBet = 'out';
-      hint.textContent = `Out at ${parseFloat(r.cashed_out_at).toFixed(2)}× — paid at settlement.`;
+      const at = parseFloat(r.cashed_out_at);
      const won = stake * at;
      if (won > stats.best) stats.best = won;
      saveStats();
      hint.textContent = `Out at ${at.toFixed(2)}× — paid at settlement.`;
      hint.className = 'hint good';
-      const b = await api('GET', '/api/balance');
+      buzz([25, 30, 25]);
-      setBalance(b.balance_msat);
+      refreshBalance();
    }
  } catch (e) {
    hint.textContent = e.message;
@@ -236,131 +349,7 @@ async function onAction() {
  }
 }
-/* ---------------- rendering ----------------
+/* ---------------- ambient sound ---------------- */
 * Each game draws the same climb differently: a rocket fighting gravity, a
 * craft spiralling inward, or a tower stacking upward. */
 const canvas = $('canvas');
 const ctx = canvas.getContext('2d');
 let stars = [];
 function sizeCanvas() {
  const dpr = Math.min(window.devicePixelRatio || 1, 2);
  canvas.width = canvas.clientWidth * dpr;
  canvas.height = canvas.clientHeight * dpr;
  ctx.setTransform(dpr, 0, 0, dpr, 0, 0);
  stars = Array.from({ length: 70 }, () => ({
    x: Math.random(), y: Math.random(), r: Math.random() * 1.4 + 0.3,
  }));
 }
 window.addEventListener('resize', sizeCanvas);
 function draw(s) {
  const w = canvas.clientWidth, h = canvas.clientHeight;
  if (!w || !h) return;
  ctx.clearRect(0, 0, w, h);
  const m = parseFloat(s.multiplier) || 1;
  const crashed = s.state === 'settled';
  const progress = Math.min(1, Math.log(m) / Math.log(12));
  // Scrolling grid: a horizon that rushes past as the multiplier climbs.
  ctx.strokeStyle = '#0a7a5233';
  ctx.lineWidth = 1;
  const spacing = 34;
  const offset = (progress * 260) % spacing;
  for (let x = 0; x <= w; x += spacing) {
    ctx.beginPath(); ctx.moveTo(x, 0); ctx.lineTo(x, h); ctx.stroke();
  }
  for (let y = -spacing + offset; y <= h; y += spacing) {
    ctx.beginPath(); ctx.moveTo(0, y); ctx.lineTo(w, y); ctx.stroke();
  }
  // Sparse drifting particles, phosphor green.
  ctx.fillStyle = '#00ff9c';
  for (const st of stars) {
    const y = (st.y + progress * 0.9) % 1;
    ctx.globalAlpha = 0.12 + st.r * 0.18;
    ctx.fillRect(st.x * w, y * h, st.r, st.r);
  }
  ctx.globalAlpha = 1;
  if (currentGame === 'orbital') drawOrbital(w, h, progress, crashed);
  else if (currentGame === 'tower') drawTower(w, h, progress, crashed);
  else drawRocket(w, h, progress, crashed);
 }
 function drawRocket(w, h, p, crashed) {
  const x = w * 0.5;
  const y = h * (0.88 - p * 0.66);
  const accent = crashed ? '#ff3355' : '#00ff9c';
  // Exhaust plume: longer and more agitated as the climb steepens.
  const plume = 26 + p * 60;
  const g = ctx.createLinearGradient(x, y, x, y + plume);
  g.addColorStop(0, crashed ? '#ff3355aa' : '#00ff9ccc');
  g.addColorStop(1, '#00ff9c00');
  ctx.fillStyle = g;
  ctx.beginPath();
  ctx.moveTo(x - 7, y + 8);
  ctx.lineTo(x + 7, y + 8);
  ctx.lineTo(x + (Math.random() - 0.5) * 8, y + plume);
  ctx.closePath();
  ctx.fill();
  ctx.fillStyle = accent;
  ctx.beginPath();
  ctx.moveTo(x, y - 18);
  ctx.lineTo(x + 9, y + 10);
  ctx.lineTo(x - 9, y + 10);
  ctx.closePath();
  ctx.fill();
  if (crashed) {
    ctx.strokeStyle = '#ff335588';
    ctx.lineWidth = 2;
    for (let i = 0; i < 9; i++) {
      const a = (i / 9) * Math.PI * 2;
      ctx.beginPath();
      ctx.moveTo(x, y);
      ctx.lineTo(x + Math.cos(a) * 34, y + Math.sin(a) * 34);
      ctx.stroke();
    }
  }
 }
 function drawOrbital(w, h, p, crashed) {
  const cx = w / 2, cy = h / 2;
  const planet = Math.min(w, h) * 0.16;
  ctx.fillStyle = '#00291c';
  ctx.beginPath(); ctx.arc(cx, cy, planet, 0, Math.PI * 2); ctx.fill();
  const orbit = planet + 12 + (1 - p) * Math.min(w, h) * 0.26;
  ctx.strokeStyle = crashed ? '#ff335555' : '#00ff9c55';
  ctx.lineWidth = 1;
  ctx.beginPath(); ctx.arc(cx, cy, orbit, 0, Math.PI * 2); ctx.stroke();
  const a = p * Math.PI * 9;
  const x = cx + Math.cos(a) * orbit, y = cy + Math.sin(a) * orbit;
  ctx.fillStyle = crashed ? '#ff3355' : '#00ff9c';
  ctx.beginPath(); ctx.arc(x, y, 5, 0, Math.PI * 2); ctx.fill();
 }
 function drawTower(w, h, p, crashed) {
  const blocks = Math.floor(p * 16) + 1;
  const bw = w * 0.28, bh = h * 0.05;
  for (let i = 0; i < blocks; i++) {
    const sway = Math.sin(i * 0.7 + p * 6) * (i / blocks) * 22 * (crashed ? 3 : 1);
    const y = h * 0.9 - (i + 1) * bh;
    ctx.fillStyle = i === blocks - 1
      ? (crashed ? '#ff3355' : '#00ff9c')
      : `hsl(${160 - i} 90% ${12 + i}%)`;
    ctx.fillRect(w / 2 - bw / 2 + sway, y, bw, bh - 2);
  }
 }
 /* ---------------- ambient sound ----------------
 * Synthesised, so it never loops and ships no audio files. */
 let audio = null;
@@ -391,23 +380,6 @@ function toggleSound() {
  $('sound-toggle').classList.add('on');
 }
 let lastTone = 0;
 function tone(mult) {
  if (!audio) return;
  const now = audio.currentTime;
  if (now - lastTone < 0.28) return;
  lastTone = now;
  const o = audio.createOscillator();
  const g = audio.createGain();
  o.type = 'triangle';
  o.frequency.value = 220 * Math.min(4, mult);
  g.gain.setValueAtTime(0.0001, now);
  g.gain.exponentialRampToValueAtTime(0.03, now + 0.02);
  g.gain.exponentialRampToValueAtTime(0.0001, now + 0.25);
  o.connect(g).connect(audio.destination);
  o.start(now); o.stop(now + 0.3);
 }
 /* ---------------- scratch tickets ---------------- */
 const SYMBOLS = ['✦', '◈', '⬡', '✧', '◉', '⟡'];
@@ -426,7 +398,7 @@ async function loadScratch() {
    const result = el('div', { class: 'result' });
    const button = el('button', { class: 'primary', text: `Scratch for ${sats(stake)} sats` });
    button.dataset.play = t.id;
-    button.onclick = () => playScratch(t, grid, result);
+    button.onclick = () => playScratch(t, grid, result, button);
    const table = el('table', { class: 'odds' },
      el('tr', {},
@@ -454,9 +426,10 @@ async function loadScratch() {
  }
 }
-async function playScratch(t, grid, result) {
+async function playScratch(t, grid, result, button) {
  result.textContent = '';
  result.className = 'result';
  button.disabled = true;
  [...grid.children].forEach((c) => { c.className = 'cell'; c.textContent = '?'; });
  let out;
@@ -464,11 +437,16 @@ async function playScratch(t, grid, result) {
    out = await api('POST', '/api/scratch/play', { ticket_id: t.id, stake_msat: stake });
  } catch (e) {
    result.textContent = e.message;
    button.disabled = false;
    return;
  }
  setBalance(out.balance_msat);
  stats.wagered += stake;
  stats.plays++;
  if (out.outcome.payout_msat > stats.best) stats.best = out.outcome.payout_msat;
  if (out.outcome.payout_msat > 0) stats.wins++; else stats.losses++;
  saveStats();
  // Reveal cells one at a time — the outcome is already fixed, this is pacing.
  const cells = out.outcome.cells;
  const counts = {};
  cells.forEach((c) => (counts[c] = (counts[c] || 0) + 1));
@@ -479,17 +457,47 @@ async function playScratch(t, grid, result) {
      const cell = grid.children[i];
      cell.textContent = SYMBOLS[sym];
      cell.className = 'cell revealed' + (String(sym) === winner ? ' hit' : '');
      buzz(8);
      if (i === cells.length - 1) {
        const won = out.outcome.payout_msat > 0;
        result.className = 'result' + (won ? ' win' : '');
        result.textContent = won
          ? `${out.outcome.tier_name} — ${sats(out.outcome.payout_msat)} sats`
          : 'No win this time';
        if (won) buzz([40, 50, 40]);
        button.disabled = false;
      }
-    }, i * 130);
+    }, i * 120);
  });
 }
 /* ---------------- portfolio ---------------- */
 function renderPortfolio() {
  $('t-balance').textContent = sats(balanceMsat);
  charts.sparkline($('spark-balance'), stats.balances.slice(-40));
  const delta = stats.sessionStart == null ? 0 : balanceMsat - stats.sessionStart;
  const sess = $('t-session');
  sess.textContent = (delta >= 0 ? '+' : '') + sats(delta);
  sess.className = 'tile-value ' + (delta > 0 ? 'up' : delta < 0 ? 'down' : '');
  $('t-wagered').textContent = sats(stats.wagered);
  $('t-plays').textContent = `${stats.plays} play${stats.plays === 1 ? '' : 's'}`;
  $('t-best').textContent = sats(stats.best);
  charts.balanceChart($('chart-balance'),
    stats.balances.map((b) => ({ BalanceAfter: b })));
  charts.winLossDonut($('chart-donut'), stats.wins, stats.losses);
  charts.distributionChart($('chart-dist'), stats.crashes);
  charts.crashHistoryChart($('chart-history'), stats.crashes);
  const total = stats.wins + stats.losses;
  $('donut-note').textContent = total
    ? `${stats.wins} cashed out, ${stats.losses} rode into the crash, across ${total} rounds.`
    : '';
 }
 /* ---------------- wallet ---------------- */
 async function loadHistory() {
@@ -524,8 +532,7 @@ async function sendSats() {
  }
 }
-/* ---------------- verifier ----------------
+/* ---------------- verifier ---------------- */
 * Recomputed here, in the browser, from published values only. */
 async function sha256(bytes) {
  return new Uint8Array(await crypto.subtle.digest('SHA-256', bytes));
@@ -613,7 +620,11 @@ function selectTab(view) {
    t.classList.toggle('active', t.dataset.view === view));
  document.querySelectorAll('.view').forEach((v) =>
    (v.hidden = v.id !== 'view-' + view));
  // The 3D loop only runs while its view is visible.
  if (scene) { if (view === 'crash') scene.start(); else scene.stop(); }
  if (view === 'wallet') loadHistory();
  if (view === 'portfolio') renderPortfolio();
 }
 function setStake(v) {
@@ -626,7 +637,6 @@ function setStake(v) {
 }
 async function init() {
  sizeCanvas();
  keypair = await loadOrCreateKey();
  $('keynote').textContent = 'your key: ' + keypair.publicKeyHex.slice(0, 16) + '…';
  $('nickname').value = localStorage.getItem(NAME_STORAGE) || '';
@@ -644,7 +654,14 @@ async function init() {
    (t.onclick = () => selectTab(t.dataset.view)));
  document.querySelectorAll('.chip').forEach((c) =>
    (c.onclick = () => setStake(Number(c.dataset.stake))));
  $('auto-target').oninput = refreshAutoRow;
  document.querySelectorAll('[data-auto]').forEach((b) => {
    b.onclick = () => {
      $('auto-target').value = b.dataset.auto;
      refreshAutoRow();
    };
  });
  const pick = $('gamepick');
  [['rocket', 'Rocket'], ['orbital', 'Orbital'], ['tower', 'Tower']].forEach(([id, label]) => {
@@ -658,6 +675,7 @@ async function init() {
  });
  setStake(stake);
  renderStrip();
 }
 init();
--- a/cmd/arcade/static/charts.js
+++ b/cmd/arcade/static/charts.js
@@ -0,0 +1,274 @@
 /* Quantum Arcade — charts.
 *
 * Hand-built SVG rather than a charting library. The whole set is under 300
 * lines and adds nothing to load time, where Chart.js would cost more than the
 * 3D engine. Everything is built with createElementNS, so no untrusted value
 * ever reaches innerHTML.
 *
 * Colour follows the rest of the interface: green is neutral information,
 * amber is money you gained, red is money you lost. Nothing is coloured
 * decoratively. */
 const NS = 'http://www.w3.org/2000/svg';
 const GREEN = '#00ff9c';
 const GREEN_DIM = '#0a7a52';
 const AMBER = '#ffb000';
 const RED = '#ff3355';
 const MAGENTA = '#ff2e88';
 function svg(tag, attrs) {
  const el = document.createElementNS(NS, tag);
  for (const [k, v] of Object.entries(attrs || {})) el.setAttribute(k, v);
  return el;
 }
 function clear(node) {
  while (node.firstChild) node.removeChild(node.firstChild);
 }
 /* Charts scale to their container: the viewBox is fixed and CSS handles the
 * rest, so one implementation serves phone and desktop. */
 function frame(host, w, h) {
  clear(host);
  const root = svg('svg', {
    viewBox: `0 0 ${w} ${h}`,
    preserveAspectRatio: 'none',
    width: '100%',
    height: '100%',
  });
  host.appendChild(root);
  return root;
 }
 function emptyState(host, message) {
  clear(host);
  const p = document.createElement('p');
  p.className = 'muted small chart-empty';
  p.textContent = message;
  host.appendChild(p);
 }
 /* ---------------- balance over time ---------------- */
 /* An area chart of balance after each transaction, oldest to newest.
 * The fill is split at the starting balance so being up reads amber and being
 * down reads red without needing a legend. */
 export function balanceChart(host, entries) {
  if (!entries || entries.length < 2) {
    emptyState(host, 'Play a few rounds and your balance history appears here.');
    return;
  }
  const W = 300, H = 110, PAD = 4;
  const root = frame(host, W, H);
  const values = entries.map((e) => e.BalanceAfter / 1000); // sats
  const min = Math.min(...values);
  const max = Math.max(...values);
  const span = max - min || 1;
  const start = values[0];
  const x = (i) => PAD + (i / (values.length - 1)) * (W - PAD * 2);
  const y = (v) => H - PAD - ((v - min) / span) * (H - PAD * 2);
  // Baseline at the starting balance, so the shape reads against where you began.
  const baseY = y(start);
  root.appendChild(svg('line', {
    x1: 0, y1: baseY, x2: W, y2: baseY,
    stroke: GREEN_DIM, 'stroke-width': 1, 'stroke-dasharray': '3 3', opacity: 0.6,
  }));
  const points = values.map((v, i) => `${x(i)},${y(v)}`).join(' ');
  const up = values[values.length - 1] >= start;
  const colour = up ? AMBER : RED;
  root.appendChild(svg('polygon', {
    points: `${x(0)},${baseY} ${points} ${x(values.length - 1)},${baseY}`,
    fill: colour, opacity: 0.16,
  }));
  root.appendChild(svg('polyline', {
    points, fill: 'none', stroke: colour,
    'stroke-width': 1.6, 'stroke-linejoin': 'round',
  }));
  // Mark the latest point.
  root.appendChild(svg('circle', {
    cx: x(values.length - 1), cy: y(values[values.length - 1]),
    r: 2.6, fill: colour,
  }));
 }
 /* ---------------- recent crash points ---------------- */
 /* Bars of where recent rounds ended. Bars at or above 2x are amber, below are
 * dim — so the streaks you actually care about are visible at a glance. */
 export function crashHistoryChart(host, crashes) {
  if (!crashes || crashes.length === 0) {
    emptyState(host, 'No settled rounds yet.');
    return;
  }
  const W = 300, H = 90, PAD = 3;
  const root = frame(host, W, H);
  const shown = crashes.slice(-40);
  // Log scale: crash points are heavy-tailed, and a linear axis makes every
  // round below 10x look identical.
  const scale = (v) => Math.log(Math.max(1, v)) / Math.log(60);
  const bw = (W - PAD * 2) / shown.length;
  shown.forEach((v, i) => {
    const hgt = Math.max(2, scale(v) * (H - PAD * 2));
    root.appendChild(svg('rect', {
      x: PAD + i * bw + bw * 0.15,
      y: H - PAD - hgt,
      width: bw * 0.7,
      height: hgt,
      fill: v >= 10 ? MAGENTA : v >= 2 ? AMBER : GREEN_DIM,
      opacity: v >= 2 ? 0.95 : 0.65,
    }));
  });
  // 2x reference line — the break-even point for the most common target.
  const y2 = H - PAD - scale(2) * (H - PAD * 2);
  root.appendChild(svg('line', {
    x1: 0, y1: y2, x2: W, y2: y2,
    stroke: AMBER, 'stroke-width': 0.8, 'stroke-dasharray': '4 4', opacity: 0.55,
  }));
 }
 /* ---------------- win / loss split ---------------- */
 /* A donut, because the only question it answers is a ratio. */
 export function winLossDonut(host, wins, losses) {
  const total = wins + losses;
  if (total === 0) {
    emptyState(host, 'No completed rounds yet.');
    return;
  }
  const S = 120, R = 44, CX = S / 2, CY = S / 2;
  const root = frame(host, S, S);
  const circ = 2 * Math.PI * R;
  const winFrac = wins / total;
  root.appendChild(svg('circle', {
    cx: CX, cy: CY, r: R, fill: 'none',
    stroke: RED, 'stroke-width': 12, opacity: 0.55,
  }));
  root.appendChild(svg('circle', {
    cx: CX, cy: CY, r: R, fill: 'none',
    stroke: AMBER, 'stroke-width': 12,
    'stroke-dasharray': `${circ * winFrac} ${circ}`,
    transform: `rotate(-90 ${CX} ${CY})`,
    'stroke-linecap': 'butt',
  }));
  const pct = svg('text', {
    x: CX, y: CY + 2, 'text-anchor': 'middle',
    fill: AMBER, 'font-size': 20, 'font-family': 'ui-monospace, monospace',
    'font-weight': 700,
  });
  pct.textContent = `${Math.round(winFrac * 100)}%`;
  root.appendChild(pct);
  const label = svg('text', {
    x: CX, y: CY + 18, 'text-anchor': 'middle',
    fill: GREEN_DIM, 'font-size': 8.5, 'font-family': 'ui-monospace, monospace',
    'letter-spacing': 1.5,
  });
  label.textContent = 'CASHED OUT';
  root.appendChild(label);
 }
 /* ---------------- multiplier distribution ---------------- */
 /* A histogram of where rounds ended, with the theoretical curve drawn over it.
 * This is the honest version of a "hot numbers" board: instead of implying a
 * pattern, it shows observed frequency against what the published maths
 * predicts, so a player can see for themselves that they agree. */
 export function distributionChart(host, crashes) {
  if (!crashes || crashes.length < 5) {
    emptyState(host, 'Needs a few more rounds before the shape is meaningful.');
    return;
  }
  const W = 300, H = 110, PAD = 4;
  const root = frame(host, W, H);
  const buckets = [
    { label: '1-1.5', lo: 1, hi: 1.5 },
    { label: '1.5-2', lo: 1.5, hi: 2 },
    { label: '2-3', lo: 2, hi: 3 },
    { label: '3-5', lo: 3, hi: 5 },
    { label: '5-10', lo: 5, hi: 10 },
    { label: '10+', lo: 10, hi: Infinity },
  ];
  const counts = buckets.map((b) => crashes.filter((c) => c >= b.lo && c < b.hi).length);
  const maxCount = Math.max(...counts, 1);
  const bw = (W - PAD * 2) / buckets.length;
  // Expected share for each bucket: P(crash >= x) = 0.99 / x.
  const expected = buckets.map((b) => {
    const hi = b.hi === Infinity ? 0 : 0.99 / b.hi;
    return 0.99 / b.lo - hi;
  });
  counts.forEach((n, i) => {
    const hgt = (n / maxCount) * (H - PAD * 2 - 12);
    root.appendChild(svg('rect', {
      x: PAD + i * bw + bw * 0.18,
      y: H - PAD - 12 - hgt,
      width: bw * 0.64,
      height: Math.max(1, hgt),
      fill: GREEN, opacity: 0.5,
    }));
    const label = svg('text', {
      x: PAD + i * bw + bw / 2, y: H - 3,
      'text-anchor': 'middle', fill: GREEN_DIM,
      'font-size': 7, 'font-family': 'ui-monospace, monospace',
    });
    label.textContent = buckets[i].label;
    root.appendChild(label);
  });
  // The predicted shape, scaled to the same axis.
  const maxExpected = Math.max(...expected);
  const curve = expected.map((e, i) => {
    const hgt = (e / maxExpected) * (H - PAD * 2 - 12) * (maxCount / crashes.length) /
      (maxCount / crashes.length);
    return `${PAD + i * bw + bw / 2},${H - PAD - 12 - hgt}`;
  }).join(' ');
  root.appendChild(svg('polyline', {
    points: curve, fill: 'none', stroke: MAGENTA,
    'stroke-width': 1.3, 'stroke-dasharray': '3 2', opacity: 0.9,
  }));
 }
 /* ---------------- sparkline ---------------- */
 /* A tiny inline trend, for stat tiles. */
 export function sparkline(host, values) {
  if (!values || values.length < 2) {
    clear(host);
    return;
  }
  const W = 80, H = 22;
  const root = frame(host, W, H);
  const min = Math.min(...values);
  const max = Math.max(...values);
  const span = max - min || 1;
  const points = values.map((v, i) =>
    `${(i / (values.length - 1)) * W},${H - 2 - ((v - min) / span) * (H - 4)}`).join(' ');
  root.appendChild(svg('polyline', {
    points, fill: 'none',
    stroke: values[values.length - 1] >= values[0] ? AMBER : RED,
    'stroke-width': 1.4, 'stroke-linejoin': 'round',
  }));
 }
--- a/cmd/arcade/static/index.html
+++ b/cmd/arcade/static/index.html
@@ -2,13 +2,16 @@
 <html lang="en">
 <head>
 <meta charset="utf-8">
-<meta name="viewport" content="width=device-width, initial-scale=1, viewport-fit=cover">
+<meta name="viewport" content="width=device-width, initial-scale=1, viewport-fit=cover, user-scalable=no">
 <meta name="theme-color" content="#000000">
 <meta name="mobile-web-app-capable" content="yes">
 <meta name="apple-mobile-web-app-status-bar-style" content="black-translucent">
 <title>QUANTUM ARCADE</title>
 <link rel="stylesheet" href="/style.css">
 </head>
 <body>
-<!-- Ornate background filigree, drawn once as an SVG pattern and tiled. -->
+<!-- Circuit-trace ornament, tiled once behind everything. -->
 <svg class="filigree" aria-hidden="true">
  <defs>
    <pattern id="orn" width="60" height="52" patternUnits="userSpaceOnUse">
@@ -33,38 +36,42 @@
  <button class="sound" id="sound-toggle" title="Ambient sound">♪</button>
 </header>
-<!-- Sign-in: a nickname and nothing else. -->
+<!-- Sign-in -->
 <section class="panel center" id="signin">
  <h1>ACCESS TERMINAL</h1>
  <p class="muted small">
-    No account. No email. No password. This device generated a keypair that
+    No account. No email. No password. This device generates a keypair
-    <em>is</em> your identity. Keep the device, keep the balance.
+    that <em>is</em> your identity.
  </p>
  <input id="nickname" maxlength="20" placeholder="handle" autocomplete="off">
  <button class="primary" id="enter">Connect</button>
  <p class="fineprint" id="keynote"></p>
  <div class="cryptobadge">
    <span>Provably fair</span>
    <span>SHA-256 commit-reveal</span>
    <span>AGPL-3.0</span>
  </div>
 </section>
 <main id="app" hidden>
  <nav class="tabs">
    <button class="tab active" data-view="crash">Crash</button>
    <button class="tab" data-view="scratch">Scratchers</button>
    <button class="tab" data-view="wallet">Wallet</button>
    <button class="tab" data-view="verify">Verify</button>
  </nav>
  <!-- ============ CRASH ============ -->
  <section class="view" id="view-crash">
    <div class="gamepick" id="gamepick"></div>
    <div class="stage">
-      <canvas id="canvas"></canvas>
+      <canvas id="scene"></canvas>
      <div class="readout">
        <div class="multiplier" id="multiplier">1.00×</div>
        <div class="state" id="state">connecting…</div>
      </div>
      <div class="stagetop">
        <span class="pot" id="potline"></span>
      </div>
    </div>
    <!-- Live crash history strip, directly under the stage. -->
    <div class="strip" id="strip"></div>
    <div class="controls">
      <div class="stakerow">
@@ -74,11 +81,17 @@
        <button class="chip" data-stake="100000">100</button>
        <span class="unit">sats</span>
      </div>
      <div class="autorow" id="autorow">
        <label for="auto-target">auto&nbsp;out</label>
        <input id="auto-target" type="number" min="1.01" step="0.1"
               inputmode="decimal" placeholder="off">
        <span class="x">×</span>
        <div class="presets">
          <button data-auto="1.5">1.5</button>
          <button data-auto="2">2</button>
          <button data-auto="5">5</button>
        </div>
      </div>
      <button class="primary big" id="action">Place bet</button>
@@ -92,9 +105,9 @@
      <div class="kv"><span>commitment</span><code id="commitment">—</code></div>
      <div class="kv"><span>revealed seed</span><code id="revealed">sealed until the round ends</code></div>
      <p class="muted small">
-        The commitment is published before betting opens. The crash point is
+        The commitment is published before betting opens. The crash point comes
-        derived from that seed combined with every player's key — so it cannot
+        from that seed combined with every player's key — so it cannot be
-        be chosen after seeing who joined.
+        chosen after seeing who joined.
      </p>
    </details>
  </section>
@@ -104,6 +117,58 @@
    <div id="tickets"></div>
  </section>
  <!-- ============ PORTFOLIO ============ -->
  <section class="view" id="view-portfolio" hidden>
    <div class="tiles">
      <div class="tile">
        <span class="tile-label">balance</span>
        <span class="tile-value" id="t-balance">—</span>
        <div class="tile-spark" id="spark-balance"></div>
      </div>
      <div class="tile">
        <span class="tile-label">session</span>
        <span class="tile-value" id="t-session">—</span>
        <span class="tile-sub" id="t-session-sub">since you connected</span>
      </div>
      <div class="tile">
        <span class="tile-label">wagered</span>
        <span class="tile-value" id="t-wagered">—</span>
        <span class="tile-sub" id="t-plays">0 plays</span>
      </div>
      <div class="tile">
        <span class="tile-label">best hit</span>
        <span class="tile-value" id="t-best">—</span>
        <span class="tile-sub">largest single win</span>
      </div>
    </div>
    <div class="card">
      <h2>Balance over time</h2>
      <div class="chart" id="chart-balance"></div>
    </div>
    <div class="card">
      <h2>Cash-out rate</h2>
      <div class="chart chart-donut" id="chart-donut"></div>
      <p class="muted small" id="donut-note"></p>
    </div>
    <div class="card">
      <h2>Where rounds ended</h2>
      <div class="chart" id="chart-dist"></div>
      <p class="muted small">
        Bars are what actually happened. The dashed line is what the published
        maths predicts. They should converge — that is the point.
      </p>
    </div>
    <div class="card">
      <h2>Recent rounds</h2>
      <div class="chart" id="chart-history"></div>
    </div>
  </section>
  <!-- ============ WALLET ============ -->
  <section class="view" id="view-wallet" hidden>
    <div class="card">
@@ -115,7 +180,8 @@
    <div class="card">
      <h2>Send sats</h2>
      <input id="to-key" placeholder="recipient key" autocomplete="off">
-      <input id="send-amt" type="number" min="1" placeholder="amount in sats">
+      <input id="send-amt" type="number" min="1" inputmode="numeric"
             placeholder="amount in sats">
      <button class="primary" id="send">Send</button>
      <div class="hint" id="send-hint"></div>
    </div>
@@ -133,14 +199,61 @@
        Enter a round number. Your phone recomputes the outcome from the
        published seeds — it does not take the server's word for anything.
      </p>
-      <input id="verify-id" type="number" min="1" placeholder="round number">
+      <input id="verify-id" type="number" inputmode="numeric" min="1"
             placeholder="round number">
      <button class="primary" id="do-verify">Verify</button>
      <div id="verify-out" class="verify-out"></div>
    </div>
    <div class="card">
      <h2>Underlying tech</h2>
      <dl class="specs">
        <dt>Identity</dt>
        <dd>Ed25519 signed challenge, single-use and replay-proof.
            Hybrid Ed25519 + ML-DSA-65 (FIPS 204) is implemented and tested
            server-side; browser signing lands with the WASM module.</dd>
        <dt>Transport</dt>
        <dd>TLS 1.3 with X25519MLKEM768 hybrid key exchange when served over
            HTTPS — post-quantum against harvest-now-decrypt-later</dd>
        <dt>Fairness</dt>
        <dd>SHA-256 commitment, HMAC-SHA256 outcome derivation. Hash-based,
            so Grover only halves the margin: quantum-resistant as it stands.</dd>
        <dt>Settlement</dt>
        <dd>Bitcoin and Lightning sign with secp256k1, which is
            <em>not</em> post-quantum. No application choice changes that.</dd>
        <dt>Simulation</dt>
        <dd>Q32.32 fixed-point, zero floating point, bit-identical replay</dd>
        <dt>Ledger</dt>
        <dd>Append-only double-entry, DB-enforced, audited every request</dd>
        <dt>House edge</dt>
        <dd>1.00% — verified by test across 2,000,000 simulated plays</dd>
        <dt>Licence</dt>
        <dd>AGPL-3.0 — every line auditable, forks must publish</dd>
      </dl>
    </div>
  </section>
 </main>
-<script src="/app.js"></script>
+<!-- Bottom navigation: thumb-reachable, which is where navigation belongs on a
     phone held one-handed at a party. -->
 <nav class="tabs" id="tabs" hidden>
  <button class="tab active" data-view="crash">
    <span class="ico">▲</span><span>Crash</span>
  </button>
  <button class="tab" data-view="scratch">
    <span class="ico">◈</span><span>Scratch</span>
  </button>
  <button class="tab" data-view="portfolio">
    <span class="ico">▤</span><span>Stats</span>
  </button>
  <button class="tab" data-view="wallet">
    <span class="ico">◉</span><span>Wallet</span>
  </button>
  <button class="tab" data-view="verify">
    <span class="ico">✓</span><span>Verify</span>
  </button>
 </nav>
 <script type="module" src="/app.js"></script>
 </body>
 </html>
--- a/cmd/arcade/static/scene3d.js
+++ b/cmd/arcade/static/scene3d.js
@@ -0,0 +1,389 @@
 /* Quantum Arcade — 3D rendering.
 *
 * Three scenes sharing one renderer, because a phone should allocate exactly
 * one WebGL context no matter how many games it switches between.
 *
 * Performance rules, in priority order, because this has to hold sixty frames
 * on a mid-range phone in someone's hand at a party:
 *   - device pixel ratio capped at 2, dropped to 1.5 on small screens
 *   - low-poly geometry, no shadow maps, no post-processing passes
 *   - additive materials for glow instead of a bloom pass
 *   - particles are one BufferGeometry updated in place, never re-allocated
 *   - the render loop stops entirely when the tab is hidden
 */
 import * as THREE from '/vendor/three.module.min.js';
 const GREEN = 0x00ff9c;
 const MAGENTA = 0xff2e88;
 const AMBER = 0xffb000;
 const RED = 0xff3355;
 const PARTICLES = 220;
 export class Arcade3D {
  constructor(canvas) {
    this.canvas = canvas;
    this.renderer = new THREE.WebGLRenderer({
      canvas,
      antialias: false,     // FXAA-free; the aesthetic is crisp anyway
      alpha: true,
      powerPreference: 'high-performance',
    });
    this.renderer.setClearColor(0x000000, 0);
    this.camera = new THREE.PerspectiveCamera(55, 1, 0.1, 400);
    this.clock = new THREE.Clock();
    this.scenes = {
      rocket: this.buildRocket(),
      orbital: this.buildOrbital(),
      tower: this.buildTower(),
    };
    this.active = 'rocket';
    this.progress = 0;
    this.crashed = false;
    this.shake = 0;
    this.resize();
    window.addEventListener('resize', () => this.resize());
    // Stop rendering when the page is hidden; a background tab burning GPU on
    // someone's phone is a battery bug, not a feature.
    document.addEventListener('visibilitychange', () => {
      if (document.hidden) this.stop();
      else this.start();
    });
  }
  resize() {
    const w = this.canvas.clientWidth;
    const h = this.canvas.clientHeight;
    if (!w || !h) return;
    const cap = w < 500 ? 1.5 : 2;
    this.renderer.setPixelRatio(Math.min(window.devicePixelRatio || 1, cap));
    this.renderer.setSize(w, h, false);
    this.camera.aspect = w / h;
    this.camera.updateProjectionMatrix();
  }
  /* ---------- shared pieces ---------- */
  // A wireframe floor grid that scrolls toward the camera, which is what sells
  // the sensation of speed.
  makeGrid() {
    const grid = new THREE.GridHelper(120, 40, GREEN, 0x0a7a52);
    grid.material.transparent = true;
    grid.material.opacity = 0.28;
    grid.position.y = -6;
    return grid;
  }
  // One BufferGeometry of points, recycled every frame.
  makeParticles(spread = 40) {
    const positions = new Float32Array(PARTICLES * 3);
    const speeds = new Float32Array(PARTICLES);
    for (let i = 0; i < PARTICLES; i++) {
      positions[i * 3] = (Math.random() - 0.5) * spread;
      positions[i * 3 + 1] = (Math.random() - 0.5) * spread;
      positions[i * 3 + 2] = (Math.random() - 0.5) * spread;
      speeds[i] = 0.4 + Math.random() * 1.6;
    }
    const geo = new THREE.BufferGeometry();
    geo.setAttribute('position', new THREE.BufferAttribute(positions, 3));
    const mat = new THREE.PointsMaterial({
      color: GREEN, size: 0.22, transparent: true, opacity: 0.75,
      blending: THREE.AdditiveBlending, depthWrite: false,
    });
    const points = new THREE.Points(geo, mat);
    points.userData.speeds = speeds;
    points.userData.spread = spread;
    return points;
  }
  glowLine(geometry, color, opacity = 1) {
    return new THREE.LineSegments(
      new THREE.EdgesGeometry(geometry),
      new THREE.LineBasicMaterial({
        color, transparent: true, opacity,
        blending: THREE.AdditiveBlending, depthWrite: false,
      }));
  }
  /* ---------- rocket: a climb against gravity ---------- */
  buildRocket() {
    const scene = new THREE.Scene();
    scene.fog = new THREE.FogExp2(0x000000, 0.012);
    const grid = this.makeGrid();
    scene.add(grid);
    const particles = this.makeParticles(50);
    scene.add(particles);
    // Low-poly craft: a cone body with a wireframe overlay so it reads as
    // "instrument" rather than "toy".
    const body = new THREE.Mesh(
      new THREE.ConeGeometry(0.7, 2.4, 6),
      new THREE.MeshBasicMaterial({ color: 0x00291c }));
    const wire = this.glowLine(new THREE.ConeGeometry(0.7, 2.4, 6), GREEN);
    const craft = new THREE.Group();
    craft.add(body, wire);
    scene.add(craft);
    // Exhaust: a stretched cone that grows with thrust.
    const plume = new THREE.Mesh(
      new THREE.ConeGeometry(0.45, 2.2, 6),
      new THREE.MeshBasicMaterial({
        color: GREEN, transparent: true, opacity: 0.6,
        blending: THREE.AdditiveBlending, depthWrite: false,
      }));
    plume.rotation.x = Math.PI;
    plume.position.y = -1.9;
    craft.add(plume);
    // The planet you are leaving, which shrinks as you climb.
    const planet = this.glowLine(new THREE.IcosahedronGeometry(9, 1), 0x0a7a52, 0.5);
    planet.position.y = -18;
    scene.add(planet);
    return { scene, grid, particles, craft, plume, planet, wire };
  }
  updateRocket(s, dt, t) {
    const p = this.progress;
    s.craft.position.y = -2 + p * 9;
    s.craft.rotation.y += dt * 0.6;
    // Increasing strain: the craft trembles harder the higher it goes.
    s.craft.position.x = Math.sin(t * 9) * p * 0.28;
    s.craft.rotation.z = Math.sin(t * 7) * p * 0.14;
    const thrust = 0.6 + p * 2.6;
    s.plume.scale.set(1 + p * 0.5, thrust, 1 + p * 0.5);
    s.plume.position.y = -1.2 - thrust * 0.55;
    s.plume.material.opacity = 0.45 + Math.random() * 0.35;
    s.planet.position.y = -18 - p * 26;
    s.planet.rotation.y += dt * 0.1;
    s.grid.position.z = (s.grid.position.z + dt * (6 + p * 60)) % 3;
    s.grid.position.y = -6 - p * 4;
    const colour = this.crashed ? RED : GREEN;
    s.wire.material.color.setHex(colour);
    s.plume.material.color.setHex(colour);
    this.camera.position.set(0, s.craft.position.y + 1.5, 11 - p * 2);
    this.camera.lookAt(0, s.craft.position.y, 0);
  }
  /* ---------- orbital: a decaying orbit ---------- */
  buildOrbital() {
    const scene = new THREE.Scene();
    scene.fog = new THREE.FogExp2(0x000000, 0.02);
    const particles = this.makeParticles(44);
    scene.add(particles);
    const planet = this.glowLine(new THREE.IcosahedronGeometry(4, 1), GREEN, 0.85);
    scene.add(planet);
    const core = new THREE.Mesh(
      new THREE.IcosahedronGeometry(3.85, 1),
      new THREE.MeshBasicMaterial({ color: 0x00160f }));
    scene.add(core);
    // The orbit ring the craft is riding, which tightens as it decays.
    const ring = new THREE.Mesh(
      new THREE.TorusGeometry(9, 0.035, 6, 90),
      new THREE.MeshBasicMaterial({
        color: GREEN, transparent: true, opacity: 0.5,
        blending: THREE.AdditiveBlending, depthWrite: false,
      }));
    ring.rotation.x = Math.PI / 2.35;
    scene.add(ring);
    const craft = new THREE.Mesh(
      new THREE.OctahedronGeometry(0.42),
      new THREE.MeshBasicMaterial({ color: MAGENTA }));
    scene.add(craft);
    // A fading trail behind the craft.
    const trailPos = new Float32Array(60 * 3);
    const trailGeo = new THREE.BufferGeometry();
    trailGeo.setAttribute('position', new THREE.BufferAttribute(trailPos, 3));
    const trail = new THREE.Line(trailGeo, new THREE.LineBasicMaterial({
      color: MAGENTA, transparent: true, opacity: 0.55,
      blending: THREE.AdditiveBlending, depthWrite: false,
    }));
    scene.add(trail);
    return { scene, planet, core, ring, craft, trail, particles, trailIdx: 0 };
  }
  updateOrbital(s, dt, t) {
    const p = this.progress;
    const radius = 9 - p * 4.6;   // the orbit decays inward
    const angle = t * (1.1 + p * 5.5);
    s.craft.position.set(
      Math.cos(angle) * radius,
      Math.sin(angle * 0.55) * 1.2,
      Math.sin(angle) * radius);
    const pos = s.trail.geometry.attributes.position.array;
    // Shift the trail back one vertex and write the head.
    pos.copyWithin(3, 0, pos.length - 3);
    pos[0] = s.craft.position.x;
    pos[1] = s.craft.position.y;
    pos[2] = s.craft.position.z;
    s.trail.geometry.attributes.position.needsUpdate = true;
    s.ring.scale.setScalar(radius / 9);
    s.planet.rotation.y += dt * 0.25;
    s.planet.rotation.x += dt * 0.08;
    const colour = this.crashed ? RED : MAGENTA;
    s.craft.material.color.setHex(colour);
    s.trail.material.color.setHex(colour);
    s.planet.material.color.setHex(this.crashed ? RED : GREEN);
    this.camera.position.set(0, 8 + p * 3, 20 - p * 5);
    this.camera.lookAt(0, 0, 0);
  }
  /* ---------- tower: a stack that wobbles ---------- */
  buildTower() {
    const scene = new THREE.Scene();
    scene.fog = new THREE.FogExp2(0x000000, 0.014);
    const grid = this.makeGrid();
    scene.add(grid);
    const particles = this.makeParticles(46);
    scene.add(particles);
    // Pre-allocate the maximum stack; visibility is toggled per frame rather
    // than creating and destroying meshes mid-round.
    const MAX = 26;
    const blocks = [];
    const geo = new THREE.BoxGeometry(2.4, 0.7, 2.4);
    for (let i = 0; i < MAX; i++) {
      const group = new THREE.Group();
      group.add(new THREE.Mesh(geo, new THREE.MeshBasicMaterial({ color: 0x00170f })));
      group.add(this.glowLine(geo, GREEN, 0.9));
      group.visible = false;
      scene.add(group);
      blocks.push(group);
    }
    return { scene, grid, particles, blocks, max: MAX };
  }
  updateTower(s, dt, t) {
    const p = this.progress;
    const count = Math.max(1, Math.floor(p * s.max));
    for (let i = 0; i < s.max; i++) {
      const b = s.blocks[i];
      b.visible = i < count;
      if (!b.visible) continue;
      const h = i / s.max;
      // Sway grows with height, and violently once it collapses.
      const amp = h * h * (this.crashed ? 3.4 : 0.9);
      b.position.set(
        Math.sin(t * 2.2 + i * 0.45) * amp,
        -5 + i * 0.74,
        Math.cos(t * 1.8 + i * 0.35) * amp * 0.6);
      b.rotation.y = t * 0.15 + i * 0.08;
      b.rotation.z = Math.sin(t * 2 + i * 0.4) * amp * 0.05;
      const top = i === count - 1;
      const colour = this.crashed ? RED : (top ? AMBER : GREEN);
      b.children[1].material.color.setHex(colour);
      b.children[1].material.opacity = top ? 1 : 0.45 + h * 0.4;
    }
    s.grid.position.z = (s.grid.position.z + dt * 4) % 3;
    const height = -5 + count * 0.74;
    this.camera.position.set(0, height * 0.55 + 3, 15 - p * 2);
    this.camera.lookAt(0, height * 0.5, 0);
  }
  /* ---------- particles ---------- */
  updateParticles(points, dt) {
    const pos = points.geometry.attributes.position.array;
    const speeds = points.userData.speeds;
    const spread = points.userData.spread;
    const half = spread / 2;
    const rush = 2 + this.progress * 34;
    for (let i = 0; i < PARTICLES; i++) {
      pos[i * 3 + 2] += speeds[i] * rush * dt;
      if (pos[i * 3 + 2] > half) {
        pos[i * 3 + 2] = -half;
        pos[i * 3] = (Math.random() - 0.5) * spread;
        pos[i * 3 + 1] = (Math.random() - 0.5) * spread;
      }
    }
    points.geometry.attributes.position.needsUpdate = true;
    points.material.color.setHex(this.crashed ? RED : GREEN);
  }
  /* ---------- public API ---------- */
  setGame(game) {
    if (this.scenes[game]) this.active = game;
  }
  // progress is 0..1 across the multiplier's useful range; crashed swaps the
  // palette and unleashes the wobble.
  setState(progress, crashed) {
    this.progress = Math.max(0, Math.min(1, progress));
    if (crashed && !this.crashed) this.shake = 1; // kick the camera once
    this.crashed = crashed;
  }
  start() {
    if (this.raf) return;
    this.clock.getDelta(); // discard time spent hidden
    const loop = () => {
      this.raf = requestAnimationFrame(loop);
      this.frame();
    };
    this.raf = requestAnimationFrame(loop);
  }
  stop() {
    if (this.raf) cancelAnimationFrame(this.raf);
    this.raf = null;
  }
  frame() {
    const dt = Math.min(this.clock.getDelta(), 0.05); // clamp after a stall
    const t = this.clock.elapsedTime;
    const s = this.scenes[this.active];
    if (this.active === 'rocket') this.updateRocket(s, dt, t);
    else if (this.active === 'orbital') this.updateOrbital(s, dt, t);
    else this.updateTower(s, dt, t);
    this.updateParticles(s.particles, dt);
    // Camera shake on the crash, decaying fast.
    if (this.shake > 0.001) {
      this.camera.position.x += (Math.random() - 0.5) * this.shake * 1.6;
      this.camera.position.y += (Math.random() - 0.5) * this.shake * 1.6;
      this.shake *= 0.86;
    }
    this.renderer.render(s.scene, this.camera);
  }
 }
--- a/cmd/arcade/static/style.css
+++ b/cmd/arcade/static/style.css
@@ -352,3 +352,162 @@ button:active { transform: translateY(1px); }
 .verify-out .ok  { color: var(--green); font-weight: 700; }
 .verify-out .bad { color: var(--red); font-weight: 700; }
 .verify-out .kv code { font-size: 10px; }
 /* ============================================================
   MOBILE-FIRST LAYER
   Everything above assumed a single column. This layer adds the
   bottom navigation, stat tiles, charts, and the desktop widening.
   ============================================================ */
 /* Bottom nav replaces the old top tabs: on a phone held one-handed,
   navigation belongs where the thumb already is. */
 .tabs {
  position: fixed; bottom: 0; left: 0; right: 0; z-index: 40;
  display: flex; gap: 0; padding: 0;
  max-width: none; margin: 0;
  background: #00120cf2;
  backdrop-filter: blur(10px);
  border-top: 1px solid var(--green-ghost);
  padding-bottom: env(safe-area-inset-bottom, 0);
 }
 .tabs .tab {
  flex: 1; display: flex; flex-direction: column; align-items: center;
  gap: 3px; padding: 9px 2px 7px;
  font-size: 9px; letter-spacing: 0.1em; text-transform: uppercase;
  border: none; border-top: 2px solid transparent; border-bottom: none;
  background: none; color: var(--green-dim); border-radius: 0;
 }
 .tabs .tab .ico { font-size: 15px; line-height: 1; }
 .tabs .tab.active {
  color: var(--green); border-top-color: var(--green);
  background: #00ff9c0a;
 }
 /* Leave room for the fixed nav. */
 .view { padding-bottom: 84px; }
 /* The 3D stage is the hero: taller on phones, where vertical space is what
   there is most of. */
 .stage { aspect-ratio: 1 / 1; }
@media (min-width: 560px) { .stage { aspect-ratio: 16 / 11; } }
 #scene { width: 100%; height: 100%; display: block; }
 .stagetop {
  position: absolute; top: 0; left: 0; right: 0;
  display: flex; justify-content: center; padding: 8px;
  pointer-events: none;
 }
 .pot {
  font-size: 9.5px; letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--green-dim);
 }
 /* Crash history strip under the stage — the at-a-glance recent record. */
 .strip {
  display: flex; gap: 4px; overflow-x: auto; padding: 8px 0 2px;
  scrollbar-width: none;
 }
 .strip::-webkit-scrollbar { display: none; }
 .strip .pip {
  flex: 0 0 auto; font-size: 10.5px; padding: 4px 7px; border-radius: 2px;
  font-variant-numeric: tabular-nums;
  background: #00140e; border: 1px solid var(--green-ghost);
  color: var(--green-dim);
 }
 .strip .pip.mid  { color: var(--amber);   border-color: #4a3300; }
 .strip .pip.high { color: var(--magenta); border-color: #4a0f2c; }
 /* Auto cash-out presets. */
 .presets { display: flex; gap: 3px; margin-left: auto; }
 .presets button {
  padding: 5px 8px; font-size: 11px; color: var(--green-dim);
  font-variant-numeric: tabular-nums;
 }
 .presets button:active { color: var(--amber); border-color: var(--amber); }
 /* ---------- stat tiles ---------- */
 .tiles {
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 8px;
  margin-bottom: 12px;
 }
@media (min-width: 560px) { .tiles { grid-template-columns: repeat(4, 1fr); } }
 .tile {
  background: #00120c; border: 1px solid var(--green-ghost);
  border-radius: 3px; padding: 11px 12px;
  display: flex; flex-direction: column; gap: 2px; min-height: 76px;
 }
 .tile-label {
  font-size: 9px; letter-spacing: 0.18em; text-transform: uppercase;
  color: var(--green-dim);
 }
 .tile-value {
  font-size: 20px; font-weight: 700; font-variant-numeric: tabular-nums;
  color: var(--green); line-height: 1.15;
 }
 .tile-value.up   { color: var(--amber); }
 .tile-value.down { color: var(--red); }
 .tile-sub { font-size: 9.5px; color: var(--green-dim); }
 .tile-spark { height: 22px; margin-top: auto; }
 /* ---------- charts ---------- */
 .chart { width: 100%; height: 110px; }
 .chart-donut { height: 130px; display: grid; place-items: center; }
 .chart-donut svg { width: 130px; height: 130px; }
 .chart-empty { text-align: center; padding: 30px 10px; margin: 0; }
 /* ---------- tech spec list ---------- */
 .specs { margin: 0; font-size: 12px; }
 .specs dt {
  color: var(--amber); font-size: 9.5px; letter-spacing: 0.14em;
  text-transform: uppercase; margin-top: 10px;
 }
 .specs dt:first-child { margin-top: 0; }
 .specs dd { margin: 2px 0 0; color: var(--green-dim); }
 /* ---------- crypto badge on the sign-in screen ---------- */
 .cryptobadge {
  display: flex; gap: 6px; justify-content: center; margin-top: 18px;
  flex-wrap: wrap;
 }
 .cryptobadge span {
  font-size: 9px; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--green-dim); border: 1px solid var(--green-ghost);
  padding: 4px 8px; border-radius: 2px;
 }
 /* ---------- desktop widening ---------- */
@media (min-width: 900px) {
  .view { max-width: 860px; }
  /* Side-by-side once there is width for it, rather than a tall scroll. */
  #view-crash {
    display: grid; grid-template-columns: 1.35fr 1fr;
    grid-template-areas: "pick pick" "stage controls" "strip players" "proof proof";
    gap: 0 20px; align-items: start;
  }
  #view-crash .gamepick { grid-area: pick; }
  #view-crash .stage    { grid-area: stage; }
  #view-crash .strip    { grid-area: strip; }
  #view-crash .controls { grid-area: controls; margin-top: 0; }
  #view-crash .players  { grid-area: players; }
  #view-crash .proof    { grid-area: proof; }
  #view-portfolio { display: grid; grid-template-columns: 1fr 1fr; gap: 0 14px; }
  #view-portfolio .tiles { grid-column: 1 / -1; }
 }
 /* Respect a stated preference for less motion: the urgency pulse and the
   scanline flicker are exactly what that setting is asking about. */
@media (prefers-reduced-motion: reduce) {
  .primary.cashout { animation: none; }
  body::after { animation: none; }
  .multiplier.crashed { animation: none; }
  h1::after { animation: none; }
 }
--- a/cmd/arcade/static/vendor/three.module.min.js
+++ b/cmd/arcade/static/vendor/three.module.min.js
--- a/go.mod
+++ b/go.mod
@@ -2,13 +2,17 @@ module github.com/drjones/quantum-arcade
 go 1.26.5
-require github.com/jackc/pgx/v5 v5.10.0
+require (
 	github.com/cloudflare/circl v1.6.5
 	github.com/coder/websocket v1.8.15
 	github.com/jackc/pgx/v5 v5.10.0
 )
 require (
 	github.com/coder/websocket v1.8.15 // indirect
 	github.com/jackc/pgpassfile v1.0.0 // indirect
 	github.com/jackc/pgservicefile v0.0.0-20240606120523-5a60cdf6a761 // indirect
 	github.com/jackc/puddle/v2 v2.2.2 // indirect
 	golang.org/x/sync v0.17.0 // indirect
 	golang.org/x/sys v0.47.0 // indirect
 	golang.org/x/text v0.29.0 // indirect
 )
--- a/go.sum
+++ b/go.sum
@@ -1,3 +1,5 @@
 github.com/cloudflare/circl v1.6.5 h1:O64F26HEqNhznd/hrC5KZXVKYuKM2rx4deZDTc4ihQA=
 github.com/cloudflare/circl v1.6.5/go.mod h1:h5LNyxAc5nTue9DS5jT+48en2PSDYt3zdGnz5OstK6c=
 github.com/coder/websocket v1.8.15 h1:6B2JPeOGlpff2Uz6vOEH1Vzpi0iUz20A+lPVhPHtNUA=
 github.com/coder/websocket v1.8.15/go.mod h1:NX3SzP+inril6yawo5CQXx8+fk145lPDC6pumgx0mVg=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
@@ -20,6 +22,8 @@ github.com/stretchr/testify v1.11.1 h1:7s2iGBzp5EwR7/aIZr8ao5+dra3wiQyKjjFuvgVKu
 github.com/stretchr/testify v1.11.1/go.mod h1:wZwfW3scLgRK+23gO65QZefKpKQRnfz6sD981Nm4B6U=
 golang.org/x/sync v0.17.0 h1:l60nONMj9l5drqw6jlhIELNv9I0A4OFgRsG9k2oT9Ug=
 golang.org/x/sync v0.17.0/go.mod h1:9KTHXmSnoGruLpwFjVSX0lNNA75CykiMECbovNTZqGI=
 golang.org/x/sys v0.47.0 h1:o7XGOvZQCADBQQ4Y7VNq2dRWQR7JmOUW8Kxx4ZsNgWs=
 golang.org/x/sys v0.47.0/go.mod h1:4GL1E5IUh+htKOUEOaiffhrAeqysfVGipDYzABqnCmw=
 golang.org/x/text v0.29.0 h1:1neNs90w9YzJ9BocxfsQNHKuAT4pkghyXc4nhZ6sJvk=
 golang.org/x/text v0.29.0/go.mod h1:7MhJOA9CD2qZyOKYazxdYMF85OwPdEr9jTtBpO7ydH4=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
--- a/pkg/pqid/export_test.go
+++ b/pkg/pqid/export_test.go
@@ -0,0 +1,12 @@
 package pqid_test
 import (
 	"github.com/cloudflare/circl/sign/mldsa/mldsa65"
 	"github.com/drjones/quantum-arcade/pkg/pqid"
 )
 // signWithContext produces an ML-DSA signature under an arbitrary context, so
 // the domain-separation test can prove the production context is enforced.
 func signWithContext(priv *pqid.PrivateKey, msg, ctx, out []byte) error {
 	return mldsa65.SignTo(priv.PQ, msg, ctx, false, out)
 }
--- a/pkg/pqid/pqid.go
+++ b/pkg/pqid/pqid.go
@@ -0,0 +1,171 @@
 // Package pqid implements hybrid post-quantum player identity.
 //
 // A player's key is two keys: classical Ed25519 and post-quantum ML-DSA-65
 // (NIST FIPS 204). Both signatures are required for every authentication, so
 // the identity holds if *either* algorithm survives:
 //
 //   - Ed25519 alone falls to Shor's algorithm on a sufficiently large quantum
 //     computer.
 //   - ML-DSA is young. Lattice cryptanalysis is an active field, and betting
 //     everything on a 2024 standard would be its own kind of naive.
 //
 // Requiring both is the composition NIST and the IETF recommend: an attacker
 // must break lattice assumptions *and* elliptic curves, not either one.
 //
 // What this does and does not protect:
 //
 //	protected     player identity, session authentication, bet authorisation
 //	protected     round fairness — commit-reveal is SHA-256/HMAC, and Grover
 //	              only halves the security margin, leaving ~128 bits
 //	NOT protected Bitcoin and Lightning settlement, which sign with secp256k1.
 //	              No application-layer choice can change that.
 package pqid
 import (
 	"crypto/ed25519"
 	"crypto/sha256"
 	"encoding/hex"
 	"errors"
 	"fmt"
 	"io"
 	"github.com/cloudflare/circl/sign/mldsa/mldsa65"
 )
 // Sizes of the wire encodings.
 const (
 	EdPublicKeySize = ed25519.PublicKeySize // 32
 	EdSignatureSize = ed25519.SignatureSize // 64
 	PQPublicKeySize = mldsa65.PublicKeySize // 1952
 	PQSignatureSize = mldsa65.SignatureSize // 3309
 	PublicKeySize = EdPublicKeySize + PQPublicKeySize
 	SignatureSize = EdSignatureSize + PQSignatureSize
 	// IDSize is the length of the account identifier derived from a key.
 	IDSize = sha256.Size
 )
 // context binds signatures to this application, so a signature produced for
 // some other ML-DSA protocol cannot be replayed here.
 var context = []byte("quantum-arcade/v1")
 var (
 	ErrMalformedKey       = errors.New("pqid: malformed public key")
 	ErrMalformedSignature = errors.New("pqid: malformed signature")
 	ErrClassicalFailed    = errors.New("pqid: ed25519 signature did not verify")
 	ErrPostQuantumFailed  = errors.New("pqid: ML-DSA signature did not verify")
 )
 // PublicKey is a player's hybrid identity.
 type PublicKey struct {
 	Ed ed25519.PublicKey
 	PQ *mldsa65.PublicKey
 }
 // PrivateKey is the matching secret half. Clients hold this; the server never
 // sees it.
 type PrivateKey struct {
 	Ed ed25519.PrivateKey
 	PQ *mldsa65.PrivateKey
 }
 // GenerateKey creates a hybrid keypair.
 func GenerateKey(rand io.Reader) (*PublicKey, *PrivateKey, error) {
 	edPub, edPriv, err := ed25519.GenerateKey(rand)
 	if err != nil {
 		return nil, nil, fmt.Errorf("pqid: generating ed25519 key: %w", err)
 	}
 	pqPub, pqPriv, err := mldsa65.GenerateKey(rand)
 	if err != nil {
 		return nil, nil, fmt.Errorf("pqid: generating ML-DSA key: %w", err)
 	}
 	return &PublicKey{Ed: edPub, PQ: pqPub}, &PrivateKey{Ed: edPriv, PQ: pqPriv}, nil
 }
 // Bytes encodes the public key as ed25519 || ML-DSA.
 func (p *PublicKey) Bytes() []byte {
 	out := make([]byte, 0, PublicKeySize)
 	out = append(out, p.Ed...)
 	pq, err := p.PQ.MarshalBinary()
 	if err != nil {
 		// MarshalBinary on a valid key cannot fail; a failure here means the
 		// key is corrupt, and silently returning a short key would be worse.
 		panic("pqid: marshalling ML-DSA public key: " + err.Error())
 	}
 	return append(out, pq...)
 }
 // Hex renders the public key for transport.
 func (p *PublicKey) Hex() string { return hex.EncodeToString(p.Bytes()) }
 // ID is the account identifier: SHA-256 over the whole hybrid key.
 //
 // The ledger keys on this rather than the raw key because the hybrid key is
 // nearly 2KB, and a fixed 32-byte identifier keeps indexes small. Hashing also
 // means the identifier is stable in length no matter how the key evolves.
 func (p *PublicKey) ID() []byte {
 	sum := sha256.Sum256(p.Bytes())
 	return sum[:]
 }
 // ParsePublicKey decodes a hybrid public key from its wire encoding.
 func ParsePublicKey(b []byte) (*PublicKey, error) {
 	if len(b) != PublicKeySize {
 		return nil, fmt.Errorf("%w: got %d bytes, want %d",
 			ErrMalformedKey, len(b), PublicKeySize)
 	}
 	ed := ed25519.PublicKey(append([]byte(nil), b[:EdPublicKeySize]...))
 	var pq mldsa65.PublicKey
 	if err := pq.UnmarshalBinary(b[EdPublicKeySize:]); err != nil {
 		return nil, fmt.Errorf("%w: %v", ErrMalformedKey, err)
 	}
 	return &PublicKey{Ed: ed, PQ: &pq}, nil
 }
 // ParsePublicKeyHex decodes a hex-encoded hybrid public key.
 func ParsePublicKeyHex(s string) (*PublicKey, error) {
 	b, err := hex.DecodeString(s)
 	if err != nil {
 		return nil, fmt.Errorf("%w: not hex", ErrMalformedKey)
 	}
 	return ParsePublicKey(b)
 }
 // Sign produces both signatures over the message, concatenated.
 func Sign(priv *PrivateKey, msg []byte) ([]byte, error) {
 	edSig := ed25519.Sign(priv.Ed, msg)
 	pqSig := make([]byte, PQSignatureSize)
 	// randomized=false gives deterministic (hedged) signatures, so a bad RNG
 	// on a phone cannot leak the key through signature randomness.
 	if err := mldsa65.SignTo(priv.PQ, msg, context, false, pqSig); err != nil {
 		return nil, fmt.Errorf("pqid: ML-DSA signing: %w", err)
 	}
 	out := make([]byte, 0, SignatureSize)
 	out = append(out, edSig...)
 	return append(out, pqSig...), nil
 }
 // Verify checks both signatures. Both must pass.
 //
 // It deliberately reports which half failed: a mismatch between the two is
 // diagnostic — it means a client is half-upgraded or something is tampering
 // with one algorithm — and that is worth surfacing rather than flattening into
 // a generic failure. Nothing secret is revealed by saying which one broke.
 func Verify(pub *PublicKey, msg, sig []byte) error {
 	if len(sig) != SignatureSize {
 		return fmt.Errorf("%w: got %d bytes, want %d",
 			ErrMalformedSignature, len(sig), SignatureSize)
 	}
 	if !ed25519.Verify(pub.Ed, msg, sig[:EdSignatureSize]) {
 		return ErrClassicalFailed
 	}
 	if !mldsa65.Verify(pub.PQ, msg, context, sig[EdSignatureSize:]) {
 		return ErrPostQuantumFailed
 	}
 	return nil
 }
--- a/pkg/pqid/pqid_test.go
+++ b/pkg/pqid/pqid_test.go
@@ -0,0 +1,210 @@
 package pqid_test
 import (
 	"crypto/rand"
 	"errors"
 	"testing"
 	"github.com/drjones/quantum-arcade/pkg/pqid"
 )
 func newKey(t *testing.T) (*pqid.PublicKey, *pqid.PrivateKey) {
 	t.Helper()
 	pub, priv, err := pqid.GenerateKey(rand.Reader)
 	if err != nil {
 		t.Fatal(err)
 	}
 	return pub, priv
 }
 func TestSignAndVerify(t *testing.T) {
 	pub, priv := newKey(t)
 	msg := []byte("authenticate me")
 	sig, err := pqid.Sign(priv, msg)
 	if err != nil {
 		t.Fatal(err)
 	}
 	if err := pqid.Verify(pub, msg, sig); err != nil {
 		t.Fatalf("valid hybrid signature rejected: %v", err)
 	}
 }
 func TestWrongMessageFails(t *testing.T) {
 	pub, priv := newKey(t)
 	sig, _ := pqid.Sign(priv, []byte("original"))
 	if err := pqid.Verify(pub, []byte("tampered"), sig); err == nil {
 		t.Fatal("signature verified against a different message")
 	}
 }
 func TestWrongKeyFails(t *testing.T) {
 	_, priv := newKey(t)
 	other, _ := newKey(t)
 	sig, _ := pqid.Sign(priv, []byte("msg"))
 	if err := pqid.Verify(other, []byte("msg"), sig); err == nil {
 		t.Fatal("signature verified under the wrong key")
 	}
 }
 // The whole point of hybrid: forging only the classical half must not
 // authenticate. This is the quantum-adversary scenario — Shor breaks Ed25519,
 // ML-DSA still holds.
 func TestValidClassicalWithBrokenPostQuantumFails(t *testing.T) {
 	pub, priv := newKey(t)
 	msg := []byte("msg")
 	sig, _ := pqid.Sign(priv, msg)
 	// Keep the genuine Ed25519 signature, corrupt the ML-DSA half.
 	forged := append([]byte(nil), sig...)
 	forged[pqid.EdSignatureSize+10] ^= 0xff
 	err := pqid.Verify(pub, msg, forged)
 	if err == nil {
 		t.Fatal("a broken post-quantum half still authenticated")
 	}
 	if !errors.Is(err, pqid.ErrPostQuantumFailed) {
 		t.Fatalf("got %v, want ErrPostQuantumFailed", err)
 	}
 }
 // And the mirror case: if lattice cryptography turns out to be weak, Ed25519
 // must still stand in the way.
 func TestValidPostQuantumWithBrokenClassicalFails(t *testing.T) {
 	pub, priv := newKey(t)
 	msg := []byte("msg")
 	sig, _ := pqid.Sign(priv, msg)
 	forged := append([]byte(nil), sig...)
 	forged[5] ^= 0xff // corrupt the Ed25519 half
 	err := pqid.Verify(pub, msg, forged)
 	if err == nil {
 		t.Fatal("a broken classical half still authenticated")
 	}
 	if !errors.Is(err, pqid.ErrClassicalFailed) {
 		t.Fatalf("got %v, want ErrClassicalFailed", err)
 	}
 }
 func TestSignatureSizeIsExact(t *testing.T) {
 	_, priv := newKey(t)
 	sig, err := pqid.Sign(priv, []byte("msg"))
 	if err != nil {
 		t.Fatal(err)
 	}
 	if len(sig) != pqid.SignatureSize {
 		t.Fatalf("signature is %d bytes, want %d", len(sig), pqid.SignatureSize)
 	}
 }
 func TestTruncatedSignatureRejected(t *testing.T) {
 	pub, priv := newKey(t)
 	sig, _ := pqid.Sign(priv, []byte("msg"))
 	for _, n := range []int{0, 64, pqid.SignatureSize - 1} {
 		if err := pqid.Verify(pub, []byte("msg"), sig[:n]); !errors.Is(err, pqid.ErrMalformedSignature) {
 			t.Fatalf("signature truncated to %d bytes gave %v", n, err)
 		}
 	}
 }
 func TestPublicKeyRoundTrip(t *testing.T) {
 	pub, priv := newKey(t)
 	restored, err := pqid.ParsePublicKeyHex(pub.Hex())
 	if err != nil {
 		t.Fatal(err)
 	}
 	// The restored key must verify signatures made by the original.
 	sig, _ := pqid.Sign(priv, []byte("msg"))
 	if err := pqid.Verify(restored, []byte("msg"), sig); err != nil {
 		t.Fatalf("round-tripped key failed to verify: %v", err)
 	}
 	if string(restored.ID()) != string(pub.ID()) {
 		t.Fatal("round-tripped key has a different ID")
 	}
 }
 func TestMalformedKeysRejected(t *testing.T) {
 	cases := map[string][]byte{
 		"empty":     {},
 		"too short": make([]byte, pqid.PublicKeySize-1),
 		"too long":  make([]byte, pqid.PublicKeySize+1),
 	}
 	for name, b := range cases {
 		if _, err := pqid.ParsePublicKey(b); !errors.Is(err, pqid.ErrMalformedKey) {
 			t.Errorf("%s: got %v, want ErrMalformedKey", name, err)
 		}
 	}
 	if _, err := pqid.ParsePublicKeyHex("nothex!!"); !errors.Is(err, pqid.ErrMalformedKey) {
 		t.Errorf("non-hex: got %v, want ErrMalformedKey", err)
 	}
 }
 func TestIDIsStableAndDistinct(t *testing.T) {
 	a, _ := newKey(t)
 	b, _ := newKey(t)
 	if string(a.ID()) != string(a.ID()) {
 		t.Fatal("ID is not stable across calls")
 	}
 	if string(a.ID()) == string(b.ID()) {
 		t.Fatal("two distinct keys produced the same ID")
 	}
 	if len(a.ID()) != pqid.IDSize {
 		t.Fatalf("ID is %d bytes, want %d", len(a.ID()), pqid.IDSize)
 	}
 }
 // Signatures must be bound to this application, so one captured from another
 // ML-DSA protocol cannot be replayed here.
 func TestSignaturesAreDomainSeparated(t *testing.T) {
 	pub, priv := newKey(t)
 	msg := []byte("msg")
 	sig, _ := pqid.Sign(priv, msg)
 	// Verifying with the correct context succeeds (covered above). Here we
 	// confirm the context is actually in use by checking that a signature made
 	// over the same message still fails if the ML-DSA half is swapped for one
 	// generated under a different context.
 	other := make([]byte, pqid.PQSignatureSize)
 	if err := signWithContext(priv, msg, []byte("some-other-protocol"), other); err != nil {
 		t.Fatal(err)
 	}
 	forged := append(append([]byte(nil), sig[:pqid.EdSignatureSize]...), other...)
 	if err := pqid.Verify(pub, msg, forged); !errors.Is(err, pqid.ErrPostQuantumFailed) {
 		t.Fatalf("signature from another context was accepted: %v", err)
 	}
 }
 func BenchmarkSign(b *testing.B) {
 	_, priv, _ := pqid.GenerateKey(rand.Reader)
 	msg := []byte("benchmark message")
 	b.ResetTimer()
 	for i := 0; i < b.N; i++ {
 		if _, err := pqid.Sign(priv, msg); err != nil {
 			b.Fatal(err)
 		}
 	}
 }
 func BenchmarkVerify(b *testing.B) {
 	pub, priv, _ := pqid.GenerateKey(rand.Reader)
 	msg := []byte("benchmark message")
 	sig, _ := pqid.Sign(priv, msg)
 	b.ResetTimer()
 	for i := 0; i < b.N; i++ {
 		if err := pqid.Verify(pub, msg, sig); err != nil {
 			b.Fatal(err)
 		}
 	}
 }
 func BenchmarkGenerateKey(b *testing.B) {
 	for i := 0; i < b.N; i++ {
 		if _, _, err := pqid.GenerateKey(rand.Reader); err != nil {
 			b.Fatal(err)
 		}
 	}
 }