Th\u00ed nghi\u1ec7m th\u1ea9m th\u1ea5u \u1edf khoai t\u00e2y<\/title>\n <style>\n :root{\n --blue:#003366;\n --blue2:#0b5cab;\n --bg:#eef7ff;\n --card:#ffffff;\n --line:#d7e6f5;\n --text:#102a43;\n --muted:#62758a;\n --green:#22a96a;\n --orange:#ef8b3c;\n --shadow:0 4px 14px rgba(0,51,102,.08);\n --label:rgba(255,255,255,.84);\n --safe-bottom:calc(88px + env(safe-area-inset-bottom));\n }\n *{box-sizing:border-box;-webkit-tap-highlight-color:transparent}\n html,body{margin:0;padding:0;background:var(--bg);color:var(--text);font-family:Inter,Montserrat,Arial,sans-serif}\n body{min-height:100vh}\n button{font:inherit}\n\n .fixed-title,.fixed-lang,.fixed-brand,.fixed-fullscreen,.sticky-bar{z-index:9999}\n .fixed-title{\n position:fixed;top:10px;left:10px;\n background:#fff;border:1px solid var(--line);border-radius:14px;\n padding:10px 14px;box-shadow:var(--shadow);font-size:16px;font-weight:800;max-width:68vw;\n }\n .fixed-lang{\n position:fixed;top:10px;right:10px;\n background:var(--blue);color:#fff;border:none;border-radius:14px;\n min-width:72px;padding:12px 14px;font-size:18px;font-weight:800;box-shadow:var(--shadow);cursor:pointer;\n }\n .fixed-brand{\n position:fixed;left:10px;bottom:96px;font-size:12px;color:#6d7d90;\n background:rgba(255,255,255,.95);border:1px solid var(--line);border-radius:12px;padding:7px 10px;max-width:56vw;\n }\n .fixed-fullscreen{\n position:fixed;right:10px;bottom:96px;background:var(--blue);color:#fff;border:none;\n border-radius:14px;padding:12px 16px;font-size:18px;font-weight:800;box-shadow:var(--shadow);cursor:pointer;\n }\n\n .page{\n width:min(1200px,100%);margin:0 auto;\n padding:76px 12px var(--safe-bottom);\n }\n .sim{\n display:grid;grid-template-columns:1.45fr .95fr;gap:12px;align-items:stretch;\n min-height:calc(100vh - 76px - var(--safe-bottom));\n }\n .panel{\n background:var(--card);border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow);padding:12px;\n }\n .chips{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:10px}\n .chip{background:#eaf4ff;border-radius:999px;padding:8px 12px;font-size:14px;font-weight:700}\n .scene{\n display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px;\n }\n .cup{\n border:2px solid var(--line);border-radius:18px;padding:10px;background:#f8fcff;cursor:pointer;\n transition:border-color .15s ease, transform .15s ease;\n }\n .cup.active{border-color:var(--blue);transform:translateY(-2px)}\n .cup-title,.tag,.hint,.result,.term,.question,.feedback,.summary{\n background:var(--label);border-radius:12px;\n }\n .cup-title{padding:8px 10px;font-size:16px;font-weight:800;min-height:58px}\n .jar{\n position:relative;width:100%;height:220px;margin:8px auto 10px;border:5px solid #afc4d8;border-top-width:10px;\n border-radius:18px 18px 24px 24px;background:#f7fbff;overflow:hidden;\n }\n .water{position:absolute;left:0;right:0;bottom:0;height:72%;background:linear-gradient(180deg,#bfe7ff,#5ea9e8)}\n .potato{\n position:absolute;left:50%;bottom:46px;transform:translateX(-50%);\n border-radius:18px;background:linear-gradient(180deg,#f5d790,#d9b15f);border:2px solid rgba(120,80,10,.28);\n }\n .arrow{\n position:absolute;left:50%;top:12px;transform:translateX(-50%);font-size:34px;font-weight:900;\n line-height:1;\n }\n .arrow.in{color:var(--green)} .arrow.none{color:var(--blue2)} .arrow.out{color:var(--orange)}\n .hint{padding:8px 10px;font-size:14px;font-weight:700;color:var(--muted);margin-bottom:8px}\n .result{padding:10px;font-size:14px;line-height:1.4;min-height:84px}\n .result strong{color:var(--blue)}\n\n .side{display:grid;grid-template-rows:auto auto auto 1fr;gap:10px}\n .side h2{margin:0;font-size:20px;color:var(--blue)}\n .terms{display:grid;grid-template-columns:1fr 1fr;gap:8px}\n .term{padding:10px;font-size:14px;line-height:1.35;border:1px solid #e6f1fb}\n .term b{display:block;color:var(--blue);margin-bottom:2px}\n .question{padding:12px;border:1px solid #e6f1fb}\n .choices{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin-top:8px}\n .choice{\n border:2px solid #d8e8f7;background:#fff;color:var(--blue);border-radius:14px;padding:12px 8px;\n font-size:16px;font-weight:800;cursor:pointer;\n }\n .choice.active{background:var(--blue);color:#fff;border-color:var(--blue)}\n .feedback{padding:12px;font-size:15px;line-height:1.45;border:1px solid #e6f1fb}\n .feedback.good{outline:2px solid rgba(34,169,106,.22)}\n .feedback.bad{outline:2px solid rgba(239,139,60,.22)}\n .summary{padding:12px;font-size:14px;line-height:1.5;border:1px solid #e6f1fb}\n\n .sticky-bar{\n position:fixed;left:0;right:0;bottom:0;background:#ffffff;border-top:1px solid var(--line);\n display:flex;justify-content:center;gap:10px;padding:10px 12px calc(10px + env(safe-area-inset-bottom));\n box-shadow:0 -2px 12px rgba(0,51,102,.06);\n }\n .bar-btn{\n border:none;border-radius:14px;padding:14px 18px;font-size:18px;font-weight:800;cursor:pointer;box-shadow:var(--shadow);\n }\n .bar-btn.light{background:#fff;color:var(--blue);border:1px solid var(--line)}\n .bar-btn.dark{background:var(--blue);color:#fff}\n\n @media (max-width: 960px){\n .sim{grid-template-columns:1fr;min-height:auto}\n .scene{grid-template-columns:1fr}\n .terms,.choices{grid-template-columns:1fr}\n .fixed-title{max-width:58vw}\n .fixed-brand{bottom:142px;max-width:70vw}\n .fixed-fullscreen{bottom:142px}\n .sticky-bar{justify-content:space-between}\n .bar-btn{flex:1;min-width:0}\n .page{padding-top:78px}\n }\n <\/style>\n<\/head>\n<body>\n <div class=\"fixed-title\" id=\"title\"><\/div>\n <button class=\"fixed-lang\" id=\"topLang\">VN<\/button>\n <div class=\"fixed-brand\">\u0110\u01a1n v\u1ecb ph\u00e1t tri\u1ec3n: Li\u00ean minh Th\u00fac \u0111\u1ea9y gi\u00e1o d\u1ee5c STEM @sepa.org.vn<\/div>\n <button class=\"fixed-fullscreen\" id=\"fullscreenBtn\">Fullscreen<\/button>\n\n <main class=\"page\">\n <section class=\"sim\">\n <div class=\"panel\">\n <div class=\"chips\" id=\"chips\"><\/div>\n <div class=\"hint\" id=\"tapHint\"><\/div>\n <div class=\"scene\" id=\"scene\"><\/div>\n <\/div>\n\n <aside class=\"panel side\">\n <h2 id=\"sideTitle\"><\/h2>\n <div class=\"terms\" id=\"terms\"><\/div>\n <div class=\"question\">\n <div id=\"questionText\"><\/div>\n <div class=\"choices\" id=\"choices\"><\/div>\n <\/div>\n <div>\n <div class=\"feedback\" id=\"feedback\"><\/div>\n <div class=\"summary\" id=\"summary\" style=\"margin-top:10px\"><\/div>\n <\/div>\n <\/aside>\n <\/section>\n <\/main>\n\n <div class=\"sticky-bar\">\n <button class=\"bar-btn light\" id=\"resetBtn\">Reset<\/button>\n <button class=\"bar-btn dark\" id=\"bottomLang\">Language: VN\/EN<\/button>\n <\/div>\n\n <script>\n const dict = {\n vi: {\n title: '\ud83e\udd54 Th\u00ed nghi\u1ec7m th\u1ea9m th\u1ea5u \u1edf khoai t\u00e2y',\n chips: ['\ud83d\udca7 Th\u1ea9m th\u1ea5u qua m\u00e0ng b\u00e1n th\u1ea5m', '\ud83e\uddc2 0 g \u00b7 2 g \u00b7 4 g mu\u1ed1i \/ 100 mL n\u01b0\u1edbc', '\ud83d\udc46 Ch\u1ea1m v\u00e0o c\u1ed1c \u0111\u1ec3 d\u1ef1 \u0111o\u00e1n'],\n tapHint: 'Ho\u1ea1t \u0111\u1ed9ng: Ch\u1ecdn 1 c\u1ed1c, r\u1ed3i b\u1ea5m d\u1ef1 \u0111o\u00e1n h\u01b0\u1edbng n\u01b0\u1edbc di chuy\u1ec3n.',\n sideTitle: '\ud83c\udfaf D\u1ef1 \u0111o\u00e1n',\n terms: [\n ['\ud83d\udd2c Th\u1ea9m th\u1ea5u', 'N\u01b0\u1edbc \u0111i qua m\u00e0ng b\u00e1n th\u1ea5m.'],\n ['\ud83e\uddea Nh\u01b0\u1ee3c tr\u01b0\u01a1ng', 'N\u01b0\u1edbc \u0111i v\u00e0o t\u1ebf b\u00e0o.'],\n ['\u2696\ufe0f \u0110\u1eb3ng tr\u01b0\u01a1ng', 'G\u1ea7n c\u00e2n b\u1eb1ng.'],\n ['\ud83e\uddc2 \u01afu tr\u01b0\u01a1ng', 'N\u01b0\u1edbc \u0111i ra kh\u1ecfi t\u1ebf b\u00e0o.']\n ],\n cups: ['C\u1ed1c 1: 0 g mu\u1ed1i', 'C\u1ed1c 2: 2 g mu\u1ed1i', 'C\u1ed1c 3: 4 g mu\u1ed1i'],\n cupTags: ['Nh\u01b0\u1ee3c tr\u01b0\u01a1ng', 'G\u1ea7n \u0111\u1eb3ng tr\u01b0\u01a1ng', '\u01afu tr\u01b0\u01a1ng'],\n resultDir: { in:'N\u01b0\u1edbc \u0111i v\u00e0o', none:'G\u1ea7n c\u00e2n b\u1eb1ng', out:'N\u01b0\u1edbc \u0111i ra' },\n resultState: { in:'D\u00e0i h\u01a1n, c\u1ee9ng h\u01a1n', none:'\u00cdt thay \u0111\u1ed5i', out:'Ng\u1eafn h\u01a1n, m\u1ec1m h\u01a1n' },\n len: 'Chi\u1ec1u d\u00e0i', dia: '\u0110\u01b0\u1eddng k\u00ednh',\n question: 'N\u01b0\u1edbc s\u1ebd di chuy\u1ec3n theo h\u01b0\u1edbng n\u00e0o trong c\u1ed1c \u0111ang ch\u1ecdn?',\n options: ['N\u01b0\u1edbc \u0111i v\u00e0o', 'G\u1ea7n c\u00e2n b\u1eb1ng', 'N\u01b0\u1edbc \u0111i ra'],\n pickCup: 'H\u00e3y ch\u1ecdn m\u1ed9t c\u1ed1c tr\u01b0\u1edbc.',\n good: '\u0110\u00fang. ', bad: 'Ch\u01b0a \u0111\u00fang. ',\n explain: [\n 'Dung d\u1ecbch ngo\u00e0i t\u1ebf b\u00e0o nh\u01b0\u1ee3c tr\u01b0\u01a1ng so v\u1edbi d\u1ecbch b\u00e0o. N\u01b0\u1edbc \u0111i v\u00e0o t\u1ebf b\u00e0o khoai.',\n 'Dung d\u1ecbch g\u1ea7n \u0111\u1eb3ng tr\u01b0\u01a1ng. N\u01b0\u1edbc d\u1ecbch chuy\u1ec3n r\u1ea5t \u00edt theo hai chi\u1ec1u.',\n 'Dung d\u1ecbch ngo\u00e0i t\u1ebf b\u00e0o \u01b0u tr\u01b0\u01a1ng. N\u01b0\u1edbc \u0111i ra kh\u1ecfi t\u1ebf b\u00e0o khoai.'\n ],\n summary: 'K\u1ebft lu\u1eadn: N\u1ed3ng \u0111\u1ed9 ch\u1ea5t tan \u1edf m\u00f4i tr\u01b0\u1eddng ngo\u00e0i quy\u1ebft \u0111\u1ecbnh h\u01b0\u1edbng th\u1ea9m th\u1ea5u. Mu\u1ed1i c\u00e0ng nhi\u1ec1u, n\u01b0\u1edbc c\u00e0ng c\u00f3 xu h\u01b0\u1edbng r\u1eddi kh\u1ecfi t\u1ebf b\u00e0o khoai.',\n reset: 'Reset', topLang: 'VN', bottomLang: 'Language: VN\/EN', fullscreen: 'Fullscreen'\n },\n en: {\n title: '\ud83e\udd54 Potato Osmosis Simulation',\n chips: ['\ud83d\udca7 Osmosis through a semipermeable membrane', '\ud83e\uddc2 0 g \u00b7 2 g \u00b7 4 g salt \/ 100 mL water', '\ud83d\udc46 Tap a cup to predict'],\n tapHint: 'Activity: Select one cup, then choose the direction of water movement.',\n sideTitle: '\ud83c\udfaf Prediction',\n terms: [\n ['\ud83d\udd2c Osmosis', 'Water moves through a semipermeable membrane.'],\n ['\ud83e\uddea Hypotonic', 'Water moves into cells.'],\n ['\u2696\ufe0f Isotonic', 'Near balance.'],\n ['\ud83e\uddc2 Hypertonic', 'Water moves out of cells.']\n ],\n cups: ['Cup 1: 0 g salt', 'Cup 2: 2 g salt', 'Cup 3: 4 g salt'],\n cupTags: ['Hypotonic', 'Near isotonic', 'Hypertonic'],\n resultDir: { in:'Water in', none:'Near balance', out:'Water out' },\n resultState: { in:'Longer, firmer', none:'Small change', out:'Shorter, softer' },\n len: 'Length', dia: 'Diameter',\n question: 'In the selected cup, which way will water move?',\n options: ['Water in', 'Near balance', 'Water out'],\n pickCup: 'Select a cup first.',\n good: 'Correct. ', bad: 'Not yet. ',\n explain: [\n 'The external solution is hypotonic relative to the cell sap. Water enters the potato cells.',\n 'The solution is close to isotonic. There is very little net water movement.',\n 'The external solution is hypertonic. Water leaves the potato cells.'\n ],\n summary: 'Conclusion: Solute concentration outside the cells determines the direction of osmosis. More salt makes water more likely to leave the potato cells.',\n reset: 'Reset', topLang: 'EN', bottomLang: 'Language: VN\/EN', fullscreen: 'Fullscreen'\n }\n };\n\n const cups = [\n { salt:0, direction:'in', len:56.0, dia:9.2, h:122, w:32, arrow:'\u2193', arrowClass:'in' },\n { salt:2, direction:'none', len:49.0, dia:7.8, h:108, w:28, arrow:'\u2195', arrowClass:'none' },\n { salt:4, direction:'out', len:43.5, dia:6.9, h:96, w:24, arrow:'\u2191', arrowClass:'out' }\n ];\n\n let lang = 'vi';\n let selected = null;\n let answer = null;\n\n const $ = (id) => document.getElementById(id);\n\n function renderScene(){\n const d = dict[lang];\n $('scene').innerHTML = cups.map((cup, i) => {\n const active = selected === i ? 'active' : '';\n return `\n <div class=\"cup ${active}\" data-index=\"${i}\" role=\"button\" tabindex=\"0\" aria-label=\"${d.cups[i]}\">\n <div class=\"cup-title\">${d.cups[i]}<div class=\"tag\" style=\"margin-top:6px;padding:6px 8px;font-size:14px;font-weight:700\">${d.cupTags[i]}<\/div><\/div>\n <div class=\"jar\">\n <div class=\"water\"><\/div>\n <div class=\"arrow ${cup.arrowClass}\">${cup.arrow}<\/div>\n <div class=\"potato\" style=\"height:${cup.h}px;width:${cup.w}px\"><\/div>\n <\/div>\n <div class=\"result\">\n <strong>${d.resultDir[cup.direction]}<\/strong><br>\n ${d.len}: ${cup.len.toFixed(1)} mm \u00b7 ${d.dia}: ${cup.dia.toFixed(1)} mm<br>\n ${d.resultState[cup.direction]}\n <\/div>\n <\/div>`;\n }).join('');\n\n document.querySelectorAll('.cup').forEach(el => {\n el.addEventListener('click', () => selectCup(Number(el.dataset.index)));\n el.addEventListener('keydown', (ev) => {\n if(ev.key === 'Enter' || ev.key === ' '){\n ev.preventDefault();\n selectCup(Number(el.dataset.index));\n }\n });\n });\n }\n\n function renderSide(){\n const d = dict[lang];\n $('sideTitle').textContent = d.sideTitle;\n $('terms').innerHTML = d.terms.map(item => `<div class=\"term\"><b>${item[0]}<\/b>${item[1]}<\/div>`).join('');\n $('questionText').textContent = d.question;\n $('choices').innerHTML = d.options.map((opt, idx) => `<button class=\"choice ${answer === idx ? 'active' : ''}\" data-answer=\"${idx}\">${opt}<\/button>`).join('');\n\n document.querySelectorAll('.choice').forEach(btn => {\n btn.addEventListener('click', () => chooseAnswer(Number(btn.dataset.answer)));\n });\n\n const fb = $('feedback');\n const sum = $('summary');\n if(selected === null){\n fb.className = 'feedback';\n fb.textContent = d.pickCup;\n } else if(answer === null){\n fb.className = 'feedback';\n fb.textContent = d.cups[selected] + '. ' + d.explain[selected];\n } else {\n const key = ['in','none','out'][answer];\n const correct = key === cups[selected].direction;\n fb.className = 'feedback ' + (correct ? 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.fixed-fullscreen{bottom:142px}\n .sticky-bar{justify-content:space-between}\n .bar-btn{flex:1;min-width:0}\n .page{padding-top:78px}\n }\n <\/style>\n<\/head>\n<body>\n <div class=\"fixed-title\" id=\"title\"><\/div>\n <button class=\"fixed-lang\" id=\"topLang\">VN<\/button>\n <div class=\"fixed-brand\">\u0110\u01a1n v\u1ecb ph\u00e1t tri\u1ec3n: Li\u00ean minh Th\u00fac \u0111\u1ea9y gi\u00e1o d\u1ee5c STEM @sepa.org.vn<\/div>\n <button class=\"fixed-fullscreen\" id=\"fullscreenBtn\">Fullscreen<\/button>\n\n <main class=\"page\">\n <section class=\"sim\">\n <div class=\"panel\">\n <div class=\"chips\" id=\"chips\"><\/div>\n <div class=\"hint\" id=\"tapHint\"><\/div>\n <div class=\"scene\" id=\"scene\"><\/div>\n <\/div>\n\n <aside class=\"panel side\">\n <h2 id=\"sideTitle\"><\/h2>\n <div class=\"terms\" id=\"terms\"><\/div>\n <div class=\"question\">\n <div id=\"questionText\"><\/div>\n <div class=\"choices\" id=\"choices\"><\/div>\n <\/div>\n <div>\n <div class=\"feedback\" id=\"feedback\"><\/div>\n <div class=\"summary\" id=\"summary\" style=\"margin-top:10px\"><\/div>\n <\/div>\n <\/aside>\n <\/section>\n <\/main>\n\n <div class=\"sticky-bar\">\n <button class=\"bar-btn light\" id=\"resetBtn\">Reset<\/button>\n <button class=\"bar-btn dark\" id=\"bottomLang\">Language: VN\/EN<\/button>\n <\/div>\n\n <script>\n const dict = {\n vi: {\n title: '\ud83e\udd54 Th\u00ed nghi\u1ec7m th\u1ea9m th\u1ea5u \u1edf khoai t\u00e2y',\n chips: ['\ud83d\udca7 Th\u1ea9m th\u1ea5u qua m\u00e0ng b\u00e1n th\u1ea5m', '\ud83e\uddc2 0 g \u00b7 2 g \u00b7 4 g mu\u1ed1i \/ 100 mL n\u01b0\u1edbc', '\ud83d\udc46 Ch\u1ea1m v\u00e0o c\u1ed1c \u0111\u1ec3 d\u1ef1 \u0111o\u00e1n'],\n tapHint: 'Ho\u1ea1t \u0111\u1ed9ng: Ch\u1ecdn 1 c\u1ed1c, r\u1ed3i b\u1ea5m d\u1ef1 \u0111o\u00e1n h\u01b0\u1edbng n\u01b0\u1edbc di chuy\u1ec3n.',\n sideTitle: '\ud83c\udfaf D\u1ef1 \u0111o\u00e1n',\n terms: [\n ['\ud83d\udd2c Th\u1ea9m th\u1ea5u', 'N\u01b0\u1edbc \u0111i qua m\u00e0ng b\u00e1n th\u1ea5m.'],\n ['\ud83e\uddea Nh\u01b0\u1ee3c tr\u01b0\u01a1ng', 'N\u01b0\u1edbc \u0111i v\u00e0o t\u1ebf b\u00e0o.'],\n ['\u2696\ufe0f \u0110\u1eb3ng tr\u01b0\u01a1ng', 'G\u1ea7n c\u00e2n b\u1eb1ng.'],\n ['\ud83e\uddc2 \u01afu tr\u01b0\u01a1ng', 'N\u01b0\u1edbc \u0111i ra kh\u1ecfi t\u1ebf b\u00e0o.']\n ],\n cups: ['C\u1ed1c 1: 0 g mu\u1ed1i', 'C\u1ed1c 2: 2 g mu\u1ed1i', 'C\u1ed1c 3: 4 g mu\u1ed1i'],\n cupTags: ['Nh\u01b0\u1ee3c tr\u01b0\u01a1ng', 'G\u1ea7n \u0111\u1eb3ng tr\u01b0\u01a1ng', '\u01afu tr\u01b0\u01a1ng'],\n resultDir: { in:'N\u01b0\u1edbc \u0111i v\u00e0o', none:'G\u1ea7n c\u00e2n b\u1eb1ng', out:'N\u01b0\u1edbc \u0111i ra' },\n resultState: { in:'D\u00e0i h\u01a1n, c\u1ee9ng h\u01a1n', none:'\u00cdt thay \u0111\u1ed5i', out:'Ng\u1eafn h\u01a1n, m\u1ec1m h\u01a1n' },\n len: 'Chi\u1ec1u d\u00e0i', dia: '\u0110\u01b0\u1eddng k\u00ednh',\n question: 'N\u01b0\u1edbc s\u1ebd di chuy\u1ec3n theo h\u01b0\u1edbng n\u00e0o trong c\u1ed1c \u0111ang ch\u1ecdn?',\n options: ['N\u01b0\u1edbc \u0111i v\u00e0o', 'G\u1ea7n c\u00e2n b\u1eb1ng', 'N\u01b0\u1edbc \u0111i ra'],\n pickCup: 'H\u00e3y ch\u1ecdn m\u1ed9t c\u1ed1c tr\u01b0\u1edbc.',\n good: '\u0110\u00fang. ', bad: 'Ch\u01b0a \u0111\u00fang. ',\n explain: [\n 'Dung d\u1ecbch ngo\u00e0i t\u1ebf b\u00e0o nh\u01b0\u1ee3c tr\u01b0\u01a1ng so v\u1edbi d\u1ecbch b\u00e0o. N\u01b0\u1edbc \u0111i v\u00e0o t\u1ebf b\u00e0o khoai.',\n 'Dung d\u1ecbch g\u1ea7n \u0111\u1eb3ng tr\u01b0\u01a1ng. N\u01b0\u1edbc d\u1ecbch chuy\u1ec3n r\u1ea5t \u00edt theo hai chi\u1ec1u.',\n 'Dung d\u1ecbch ngo\u00e0i t\u1ebf b\u00e0o \u01b0u tr\u01b0\u01a1ng. N\u01b0\u1edbc \u0111i ra kh\u1ecfi t\u1ebf b\u00e0o khoai.'\n ],\n summary: 'K\u1ebft lu\u1eadn: N\u1ed3ng \u0111\u1ed9 ch\u1ea5t tan \u1edf m\u00f4i tr\u01b0\u1eddng ngo\u00e0i quy\u1ebft \u0111\u1ecbnh h\u01b0\u1edbng th\u1ea9m th\u1ea5u. Mu\u1ed1i c\u00e0ng nhi\u1ec1u, n\u01b0\u1edbc c\u00e0ng c\u00f3 xu h\u01b0\u1edbng r\u1eddi kh\u1ecfi t\u1ebf b\u00e0o khoai.',\n reset: 'Reset', topLang: 'VN', bottomLang: 'Language: VN\/EN', fullscreen: 'Fullscreen'\n },\n en: {\n title: '\ud83e\udd54 Potato Osmosis Simulation',\n chips: ['\ud83d\udca7 Osmosis through a semipermeable membrane', '\ud83e\uddc2 0 g \u00b7 2 g \u00b7 4 g salt \/ 100 mL water', '\ud83d\udc46 Tap a cup to predict'],\n tapHint: 'Activity: Select one cup, then choose the direction of water movement.',\n sideTitle: '\ud83c\udfaf Prediction',\n terms: [\n ['\ud83d\udd2c Osmosis', 'Water moves through a semipermeable membrane.'],\n ['\ud83e\uddea Hypotonic', 'Water moves into cells.'],\n ['\u2696\ufe0f Isotonic', 'Near balance.'],\n ['\ud83e\uddc2 Hypertonic', 'Water moves out of cells.']\n ],\n cups: ['Cup 1: 0 g salt', 'Cup 2: 2 g salt', 'Cup 3: 4 g salt'],\n cupTags: ['Hypotonic', 'Near isotonic', 'Hypertonic'],\n resultDir: { in:'Water in', none:'Near balance', out:'Water out' },\n resultState: { in:'Longer, firmer', none:'Small change', out:'Shorter, softer' },\n len: 'Length', dia: 'Diameter',\n question: 'In the selected cup, which way will water move?',\n options: ['Water in', 'Near balance', 'Water out'],\n pickCup: 'Select a cup first.',\n good: 'Correct. ', bad: 'Not yet. ',\n explain: [\n 'The external solution is hypotonic relative to the cell sap. Water enters the potato cells.',\n 'The solution is close to isotonic. There is very little net water movement.',\n 'The external solution is hypertonic. Water leaves the potato cells.'\n ],\n summary: 'Conclusion: Solute concentration outside the cells determines the direction of osmosis. More salt makes water more likely to leave the potato cells.',\n reset: 'Reset', topLang: 'EN', bottomLang: 'Language: VN\/EN', fullscreen: 'Fullscreen'\n }\n };\n\n const cups = [\n { salt:0, direction:'in', len:56.0, dia:9.2, h:122, w:32, arrow:'\u2193', arrowClass:'in' },\n { salt:2, direction:'none', len:49.0, dia:7.8, h:108, w:28, arrow:'\u2195', arrowClass:'none' },\n { salt:4, direction:'out', len:43.5, dia:6.9, h:96, w:24, arrow:'\u2191', arrowClass:'out' }\n ];\n\n let lang = 'vi';\n let selected = null;\n let answer = null;\n\n const $ = (id) => document.getElementById(id);\n\n function renderScene(){\n const d = dict[lang];\n $('scene').innerHTML = cups.map((cup, i) => {\n const active = selected === i ? 'active' : '';\n return `\n <div class=\"cup ${active}\" data-index=\"${i}\" role=\"button\" tabindex=\"0\" aria-label=\"${d.cups[i]}\">\n <div class=\"cup-title\">${d.cups[i]}<div class=\"tag\" style=\"margin-top:6px;padding:6px 8px;font-size:14px;font-weight:700\">${d.cupTags[i]}<\/div><\/div>\n <div class=\"jar\">\n <div class=\"water\"><\/div>\n <div class=\"arrow ${cup.arrowClass}\">${cup.arrow}<\/div>\n <div class=\"potato\" style=\"height:${cup.h}px;width:${cup.w}px\"><\/div>\n <\/div>\n <div class=\"result\">\n <strong>${d.resultDir[cup.direction]}<\/strong><br>\n ${d.len}: ${cup.len.toFixed(1)} mm \u00b7 ${d.dia}: ${cup.dia.toFixed(1)} mm<br>\n ${d.resultState[cup.direction]}\n <\/div>\n <\/div>`;\n }).join('');\n\n document.querySelectorAll('.cup').forEach(el => {\n el.addEventListener('click', () => selectCup(Number(el.dataset.index)));\n el.addEventListener('keydown', (ev) => {\n if(ev.key === 'Enter' || ev.key === ' '){\n ev.preventDefault();\n selectCup(Number(el.dataset.index));\n }\n });\n });\n }\n\n function renderSide(){\n const d = dict[lang];\n $('sideTitle').textContent = d.sideTitle;\n $('terms').innerHTML = d.terms.map(item => `<div class=\"term\"><b>${item[0]}<\/b>${item[1]}<\/div>`).join('');\n $('questionText').textContent = d.question;\n $('choices').innerHTML = d.options.map((opt, idx) => `<button class=\"choice ${answer === idx ? 'active' : ''}\" data-answer=\"${idx}\">${opt}<\/button>`).join('');\n\n document.querySelectorAll('.choice').forEach(btn => {\n btn.addEventListener('click', () => chooseAnswer(Number(btn.dataset.answer)));\n });\n\n const fb = $('feedback');\n const sum = $('summary');\n if(selected === null){\n fb.className = 'feedback';\n fb.textContent = d.pickCup;\n } else if(answer === null){\n fb.className = 'feedback';\n fb.textContent = d.cups[selected] + '. ' + d.explain[selected];\n } else {\n const key = ['in','none','out'][answer];\n const correct = key === cups[selected].direction;\n fb.className = 'feedback ' + (correct ? 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