The home on phones: how it works and the questions are folds (#139)

ddiff --git a/public/css/app.css b/public/css/app.css
iindex c0440ea..f3bfbd0 100644
---- a/public/css/app.css
++++ b/public/css/app.css
@@@ -118,3 +118,50 @@ p.lede { font-size: 1.05rem; color: var(--text-secondary, #96a7c2); max-width: 7
  .q-sites code { font-size: .78rem; overflow-wrap: anywhere; }
  /* The full index (/quests): its filters sit under the lede. */
  .page > .ovk-tabs { margin-top: 6px; margin-bottom: 4px; }
++
++/* The phone home (2026-10-30, the owner's short-pages rule): how it works and the questions are folds, closed on a
++   phone and open where there is room. Both stay in the page for the crawlers. */
++/* Pick (the owner's short-pages rule, 2026-10-30): on a phone the front page's blocks of the same kind are one at a
++   time, picked with a row of chips. Radio inputs and :has(), no script: the chips and the one-pane rule live under
++   640 px and only where :has() is understood, so a wider screen, or an older browser, shows every pane and no chips.
++   Every pane stays in the page for crawlers. */
++.pick-head { display: none; }
++.pick-row { display: none; }
++@supports selector(:has(*)) { @media (max-width: 640px) {
++  .pick-bar { margin-top: 30px; }
++  .pick-head { display: block; }
++  .pick-head h2 { margin: 0 0 4px; font: 700 clamp(20px, 2.4vw, 28px)/1.2 var(--ov-font, 'Inter', system-ui, sans-serif); letter-spacing: -.02em; }
++  .pick-row { display: flex; gap: 8px; overflow-x: auto; margin: 10px -16px 0; padding: 2px 16px 4px; scrollbar-width: none; overscroll-behavior-x: contain; }
++  .pick-row::-webkit-scrollbar { display: none; }
++  .pick-row input { position: absolute; opacity: 0; width: 1px; height: 1px; pointer-events: none; }
++  .pick-row label { display: inline-flex; align-items: center; flex: none; min-height: 44px; padding: 0 15px; border-radius: 999px; border: 1px solid var(--border, #1f2d47); color: var(--text-secondary, #96a7c2); font-size: .9rem; font-weight: 650; white-space: nowrap; cursor: pointer; }
++  .pick-row input:checked + label { color: var(--text-primary, #e6edf7); border-color: var(--accent, #3b82f6); background: color-mix(in srgb, var(--accent, #3b82f6) 12%, transparent); }
++  .pick-row input:focus-visible + label { outline: 2px solid var(--accent, #3b82f6); outline-offset: 2px; }
++  .pick .pick-pane { display: none; }
++  /* A link that points at a pane opens that pane on a phone too. */
++  .pick .pick-pane:target { display: block !important; }
++  .pick:has(.pick-pane:target) .pick-pane:not(:target) { display: none !important; }
++  /* The chip names the pane, so the pane's own heading gives way to it; the link to more stays. */
++  .pick .pick-pane > h2, .pick .pick-pane > h3 { display: none; }
++} }
++
++/* The fold (the owner's short-pages rule): closed on a phone, and where there is room it looks like the section it
++   replaces: a heading and its content, with no card around it. */
++.hm-fold-block { margin-top: 32px; }
++.hm-fold-block > summary { display: flex; align-items: center; justify-content: space-between; gap: 10px; min-height: 44px; cursor: pointer; list-style: none; }
++.hm-fold-block > summary::-webkit-details-marker { display: none; }
++.hm-fold-block > summary h2 { margin: 0; font: 700 clamp(19px, 2.2vw, 26px)/1.2 var(--ov-font, 'Inter', system-ui, sans-serif); }
++.hm-fold-block > summary span { color: var(--text-muted, #7386a3); font-weight: 600; font-size: .86rem; white-space: nowrap; }
++.hm-fold-block > summary:focus-visible { outline: 2px solid var(--accent, #3b82f6); outline-offset: 2px; }
++@media (min-width: 641px) {
++  .hm-fold-block { border: 0; background: none; border-radius: 0; margin: 56px auto 0; padding: 0; }
++  .hm-fold-block > summary { display: block; min-height: 0; }
++  .hm-fold-block > summary h2 { margin: 0 0 6px; font: 700 clamp(22px, 2.6vw, 30px)/1.2 var(--ov-font, 'Inter', system-ui, sans-serif); }
++  .hm-fold-block > summary span { display: none; }
++  .hm-fold-block .hm-sec, .hm-fold-block .sc-sec { margin: 0; max-width: none; padding: 0; }
++}
++@media (max-width: 640px) { .hm-fold-block { margin-top: 24px; } .hm-fold-block > summary h2 { font-size: 1.05rem; } }
++/* A fold that sits inside the section it replaces adds no space of its own. */
++:where(.sc-sec, .cm-sec, .hm-sec, .section) > .hm-fold-block { margin: 0; }
++/* The folds hold the kit's own folds, so they get the room the section gave them. */
++.hm-fold-block .kit-fold, .hm-fold-block .q-steps { margin: 0; }
ddiff --git a/server/http/pages.js b/server/http/pages.js
iindex a81aef7..1fe664b 100644
---- a/server/http/pages.js
++++ b/server/http/pages.js
@@@ -26,6 +26,7 @@ const { createDiscoveryRoutes, homeJsonLd } = require('./discovery');
  const { html, raw, table } = require('../render/html');
  const { send } = require('../render/layout');
  const quests = require('../render/quests');
++const S = require('../render/short');
  const catalog = require('../quests/catalog');
  const store = require('../quests/store');
  
@@@ -128,6 +129,17 @@ function createPageRoutes(ctx) {
      // The home is a taste and a door (owner 2026-10-28: "act more like an app, not a huge long web page"): the hero,
      // one strip of numbers, the quests as rails of cards with See all → /quests and the sites as quick filters, and
      // the parts read once (how it works, what is counted, the questions) as folds. The whole catalog is /quests.
++    /**
++     * The home on a phone (the owner's short-pages rule, 2026-10-30): the parts a reader rarely needs — how it works
++     * and the questions — are folds, closed on a phone and open where there is room. Both stay in the page.
++     */
++    function foldedHome(body) {
++        let html = String(body);
++        html = S.foldSection(html, 'id="how-it-works" aria-labelledby', 'how-it-works-fold');
++        html = S.foldSection(html, 'id="questions" aria-labelledby', 'questions-fold');
++        return html;
++    }
++
      r.get('/', async (req, res) => {
          const [appList, p] = await Promise.all([ctx.appQuests ? ctx.appQuests.listed(12) : [], pulse()]);
          const site = String(config.baseUrl).replace(/\/+$/, '');
@@@ -166,7 +178,7 @@ function createPageRoutes(ctx) {
              // The kit's controls (numbers, filters, folds) and its cards and rails; no kit-web.js: the cards carry no
              // menu, and from 760 px the rails wrap into a grid instead of scrolling (public/css/app.css).
              styles: KIT_STYLES,
--            body: html`${raw(hero)}
++            body: raw(foldedHome(html`${raw(hero)}
  ${statsStrip(p)}
  ${yourStuff(req)}
  <section class="sc-sec q-rails">
@@@ -198,7 +210,7 @@ ${raw(showcase.cta({
                  title: signedIn(req) ? 'Your quest log is waiting' : 'Start your quest log',
                  text: signedIn(req) ? 'Your progress, your badges, and what each quest still needs.' : 'Sign in with OpenVibe and the sites you already use start counting.',
                  actions: signedIn(req) ? [{ label: 'Your quest log', href: '/me', primary: true }] : [{ label: 'Sign in with OpenVibe', href: '/auth/login?next=%2Fme', primary: true }],
--            }))}`,
++            }))}`)),
          });
      });
  
ddiff --git a/server/render/short.js b/server/render/short.js
nnew file mode 100644
iindex 0000000..d201b02
---- /dev/null
++++ b/server/render/short.js
@@@ -0,0 +1,86 @@
++'use strict';
++/**
++ * The home on a phone (the owner's short-pages rule, 2026-10-30): one or two screens, app-like.
++ *
++ *   pickBlock()  several blocks of the same kind, one at a time on a phone, picked with a row of chips. Radio
++ *                inputs and :has(), no script: every block stays in the page for crawlers, and a wider screen (or a
++ *                browser without :has()) shows them all and no chips.
++ *   foldBlock()  a part a reader rarely needs, closed on a phone and open where there is room. The page's own markup
++ *                keeps it open, so a browser without the script shows it as before; the script closes it on a narrow
++ *                screen and remembers the reader's choice.
++ *
++ * The CSS for both lives in the site's own stylesheet; the rule that shows the picked block is written for the
++ * page, because there is one per block.
++ */
++const esc = (s) => String(s == null ? '' : s).replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;').replace(/"/g, '&quot;');
++
++/**
++ * A pick block. The panes are the page's own blocks; each one keeps its heading on a wide screen, and on a phone the
++ * heading gives way to the chip that names it.
++ *
++ *   pickBlock({ key, label, head, panes })   head: the heading of the block, or '' when the block already has one.
++ *                                           panes: [{ id, label, html }]
++ */
++function pickBlock({ key, label, head = '', panes, bodyClass = '' }) {
++    // A pane with nothing to show is left out, so the chips and the rules that show them match the page.
++    panes = (panes || []).filter((p) => p.html);
++    if (!panes.length) return '';
++    const chips = panes.map((p, i) => `<input type="radio" name="pick-${esc(key)}" id="pk-${esc(key)}-${esc(p.id)}" value="${esc(p.id)}"${i === 0 ? ' checked' : ''}><label for="pk-${esc(key)}-${esc(p.id)}">${esc(p.label)}</label>`).join('');
++    // The pane carries the id the page already links to (an anchor in the hero, for instance), so a link to it still
++    // opens that pane on a phone (the CSS shows the pane a link points at).
++    const body = panes.map((p) => `<div class="pick-pane" id="${esc(p.id)}">${p.html}</div>`).join('');
++    const bar = `${head ? `<div class="pick-head"><h2>${esc(head)}</h2></div>` : ''}<div class="pick-row" role="radiogroup" aria-label="${esc(label)}">${chips}</div>`;
++    return `<div class="pick" id="pick-${esc(key)}"><div class="pick-bar">${bar}</div><div class="pick-body${bodyClass ? ' ' + esc(bodyClass) : ''}">${body}</div></div>`;
++}
++
++/** The rule that shows the picked block of a pick block: one per block, so the CSS is written for the page. */
++function pickRule(key, id) {
++    return `.pick:has(#pk-${key}-${id}:checked) #${id}{display:block}`;
++}
++
++/** The rules for every block of a pick block, in the order they appear. */
++function pickRules(key, ids) {
++    return ids.map((id) => pickRule(key, id)).join('');
++}
++
++/**
++ * A fold. The head is the heading the block had; the html is what it holds.
++ *
++ *   foldBlock({ id, head, html })
++ */
++function foldBlock({ id, head, html }) {
++    return `<details class="hm-fold hm-fold-block" id="${esc(id)}" open><summary>${head}<span>tap to open</span></summary>${html}</details>${foldScript(id)}`;
++}
++
++/** The script a fold carries: closed on a phone unless the reader opened it before, and it remembers that. */
++function foldScript(id) {
++    return `<script>(function(){var d=document.getElementById(${JSON.stringify(id)});if(!d)return;var k='ov_fold_'+${JSON.stringify(id)};var s=null;try{s=localStorage.getItem(k)}catch(e){}if(s==='open'){d.open=true;return}if(s==='closed'){d.open=false;return}var t=0;if(window.matchMedia&&window.matchMedia('(max-width:640px)').matches){t=Date.now();d.open=false}d.addEventListener('toggle',function(){if(Date.now()-t<300)return;try{localStorage.setItem(k,d.open?'open':'closed')}catch(e){}})})();</script>`;
++}
++
++/**
++ * A section of the page's own markup as a fold. The section stays where it was; its own heading becomes the fold's
++ * heading, and the fold is closed on a phone (the script) and open where there is room.
++ *
++ *   foldSection(html, needle, id)   needle: a mark of the part to fold (a class, for instance)
++ */
++function foldSection(html, needle, id) {
++    const at = html.indexOf(needle);
++    if (at < 0) return html;
++    const start = html.lastIndexOf('<section', at);
++    const close = html.indexOf('</section>', at);
++    if (start < 0 || close < 0) return html;
++    const openEnd = html.indexOf('>', start) + 1;
++    const openTag = html.slice(start, openEnd);
++    let inner = html.slice(openEnd, close);
++    const h2 = /<h2[^>]*>[\s\S]*?<\/h2>/.exec(inner);
++    if (!h2) return html;
++    const head = h2[0];
++    inner = inner.slice(h2.index + head.length);
++    // The lede under the heading goes with it: the fold's heading says enough on a phone.
++    const lede = /<p class="sc-lede"[^>]*>[\s\S]*?<\/p>/.exec(inner);
++    if (lede) inner = inner.slice(0, lede.index) + inner.slice(lede.index + lede[0].length);
++    const fold = `<details class="hm-fold hm-fold-block" id="${esc(id)}" open><summary>${head}<span>tap to open</span></summary>${inner.trim()}</details>${foldScript(id)}`;
++    return html.slice(0, start) + openTag + fold + html.slice(close);
++}
++
++module.exports = { pickBlock, pickRule, pickRules, foldBlock, foldScript, foldSection };
ddiff --git a/test/home-short.test.js b/test/home-short.test.js
nnew file mode 100644
iindex 0000000..3988135
---- /dev/null
++++ b/test/home-short.test.js
@@@ -0,0 +1,38 @@
++'use strict';
++/**
++ * The home on a phone (the owner's short-pages rule, 2026-10-30): how it works and the questions are folds, closed on
++ * a phone and open where there is room. Both stay in the page for the crawlers.
++ */
++const assert = require('assert');
++const fs = require('fs');
++const path = require('path');
++const { boot, check, done } = require('./helpers/boot');
++
++(async () => {
++    const t = await boot();
++    try {
++        await check('how it works and the questions are folds, open in the page and closed on a phone', async () => {
++            const r = await t.get('/');
++            assert.strictEqual(r.status, 200, r.text);
++            for (const id of ['how-it-works-fold', 'questions-fold']) {
++                assert.ok(r.text.includes(`<details class="hm-fold hm-fold-block" id="${id}" open>`), `${id} is a fold, open in the page`);
++                assert.ok(r.text.includes(`document.getElementById("${id}")`), `${id} has the script that closes it on a phone`);
++            }
++            // The content of the folds stays in the page.
++            assert.match(r.text, /From what you do to a badge/);
++            assert.match(r.text, /What is OpenVibe.Quest?/);
++            // The sections they replace are still there.
++            assert.ok(r.text.includes('id="how-it-works"'));
++            assert.ok(r.text.includes('id="questions"'));
++        });
++
++        await check('the CSS guard: a fold is a 44 px target and only the phone rules change the page', async () => {
++            const css = fs.readFileSync(path.join(__dirname, '..', 'public', 'css', 'app.css'), 'utf8');
++            assert.match(css, /\.hm-fold-block > summary \{[^}]*min-height: 44px/, 'a fold is a 44 px target');
++            assert.match(css, /\.hm-fold-block > summary span \{ display: none; \}/, 'the "tap to open" hint is hidden where there is room');
++        });
++    } finally {
++        await t.close();
++    }
++    done();
++})().catch((e) => { console.error(e); process.exit(1); });
ddiff --git a/test/perf-budget.test.js b/test/perf-budget.test.js
iindex 25ac908..eb9ff27 100644
---- a/test/perf-budget.test.js
++++ b/test/perf-budget.test.js
@@@ -27,8 +27,8 @@ const BUDGETS = {
      jsRawKB: 322,   // 321.1 with openvibe-shared 4.53.0: the footer's columns fold on phones (2026-10-30); 318.1 with openvibe-shared 4.52.0: the Dock's loader and its Chats tab (2026-10-30); 315.6 with openvibe-shared 4.48.0 (the site switcher on the mark, the menu's Start tab and quick tools; Kit's touch hit areas and the phone navbar fix, 4.44-4.47.3); 307.8 with openvibe-shared 4.43.0 (room.css carries the kit tokens, 4.39.1; the kit's 4.39.0 rules); 300.5 openvibe-shared 4.25.0: the menu's orb beside the brand, both balances on phones, messages, the account sheet on phones and the bar stepping away on phones; 293 openvibe-shared 4.22.0: the navbar's magnifier search button and More dropdown (search.js and loading.js load only when used); 287.2 Shared 4.17.0: OpenCoins and Vibes chips (wallet: true) in the navbar; 273.2 openvibe-shared 4.15 footer: the compact footer opens into the whole one, and the pulse line; 264.3 with Shared 4.13.0 (2026-10-26: account links); 239.8
      jsBrotliKB: 79,   // 78.2 with openvibe-shared 4.52.0: the Dock's loader and its Chats tab (2026-10-30); 77.6 with openvibe-shared 4.48.0 (the site switcher on the mark, the menu's Start tab and quick tools; Kit's touch hit areas and the phone navbar fix, 4.44-4.47.3); 76.1 with openvibe-shared 4.43.0 (room.css carries the kit tokens, 4.39.1; the kit's 4.39.0 rules); 74.2 openvibe-shared 4.25.0: the menu's orb beside the brand, both balances on phones, messages, the account sheet on phones and the bar stepping away on phones; 70.5 Shared 4.17.0: OpenCoins and Vibes chips (wallet: true) in the navbar; 67.9 openvibe-shared 4.15 footer: the compact footer opens into the whole one, and the pulse line; 65.3 Shared 4.12.0: the light/dark switch, the seasonal mark and the theme pairs; 56.5
      cssFiles: 4,   // 4 (2026-10-29: + /shared/kit.css and /shared/room.css, the kit's numbers, filters, folds, cards and rails); 2 (app.css + the cached /shared/showcase.css)
--    cssRawKB: 85,   // 83.8 with openvibe-shared 4.48.0 (the site switcher on the mark, the menu's Start tab and quick tools; Kit's touch hit areas and the phone navbar fix, 4.44-4.47.3); 74.6 the home on the shared kit (2026-10-29, openvibe-shared 4.37.0): kit.css 25.3 KB (numbers strip, site filters, folds) and room.css 15.7 KB (the quests as rails of cards), app.css down 1.5 KB; the page shed 13 of its 17 phone screens; 34.4 openvibe-shared 4.26.1 (hero visual); 28.9 with Shared 4.13.0 (2026-10-26: account links); 22.6 with the quest medals and cards, and the home's figures, badges, sites and FAQ (2026-10-22)
--    cssBrotliKB: 18.6,   // 18.4 with openvibe-shared 4.48.0 (the site switcher on the mark, the menu's Start tab and quick tools; Kit's touch hit areas and the phone navbar fix, 4.44-4.47.3); 16.5 kit.css and room.css on the home (2026-10-29, see cssRawKB); 6.2 with Shared 4.13.0 (2026-10-26: account links); 4.6
++    cssRawKB: 88,   // 87.6 the phone home (2026-10-30: the fold rules for how it works and the questions); 83.8 with openvibe-shared 4.48.0 (the site switcher on the mark, the menu's Start tab and quick tools; Kit's touch hit areas and the phone navbar fix, 4.44-4.47.3); 74.6 the home on the shared kit (2026-10-29, openvibe-shared 4.37.0): kit.css 25.3 KB (numbers strip, site filters, folds) and room.css 15.7 KB (the quests as rails of cards), app.css down 1.5 KB; the page shed 13 of its 17 phone screens; 34.4 openvibe-shared 4.26.1 (hero visual); 28.9 with Shared 4.13.0 (2026-10-26: account links); 22.6 with the quest medals and cards, and the home's figures, badges, sites and FAQ (2026-10-22)
++    cssBrotliKB: 19.4,   // 19.3 the phone home (2026-10-30: the fold rules for how it works and the questions); 18.4 with openvibe-shared 4.48.0 (the site switcher on the mark, the menu's Start tab and quick tools; Kit's touch hit areas and the phone navbar fix, 4.44-4.47.3); 16.5 kit.css and room.css on the home (2026-10-29, see cssRawKB); 6.2 with Shared 4.13.0 (2026-10-26: account links); 4.6
      externalFiles: 0,   // 0
  };