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Display',serif;\n font-size:0.92rem;font-weight:700;cursor:pointer;\n}\n#npk01 .mr-retry:hover{background:var(--ob);color:#E4F4F9}\n\n@media(max-width:480px){\n #npk01 .mr-title{font-size:1.4rem}\n #npk01 .mr-num{font-size:1.7rem}\n #npk01 .mr-stem{font-size:0.9rem}\n #npk01 .mr-opt-text{font-size:0.86rem}\n}\n<\/style>\n\n<div id=\"npk01\">\n\n <div class=\"mr-header\">\n <div class=\"mr-series-tag\">Numerical Series · Pharmacokinetics<\/div>\n <div class=\"mr-eyebrow\">Morning Rounds · Round 01 of 07<\/div>\n <div class=\"mr-title\">Zero, First &<br><em>The Order of Elimination<\/em><\/div>\n <div class=\"mr-subtitle\">Five calculations · Know your kinetics cold before the exam does<\/div>\n <div class=\"mr-chips\">\n <span class=\"mr-chip\">5 Questions<\/span>\n <span class=\"mr-chip\">+4 \/ −1 scoring<\/span>\n <span class=\"mr-chip\">Options reshuffled<\/span>\n <\/div>\n <\/div>\n\n <div class=\"mr-sentinel\" id=\"npk01-sentinel\"><\/div>\n\n <div class=\"mr-progress\" id=\"npk01-progress\">\n <div class=\"mr-prog-inner\">\n <div class=\"mr-pips\" id=\"npk01-pips\"><\/div>\n <\/div>\n <\/div>\n\n <div class=\"mr-body\">\n <div id=\"npk01-cases\"><\/div>\n <div class=\"mr-submit-wrap\">\n <button class=\"mr-btn\" id=\"npk01-submit\">Submit for Debrief<\/button>\n <\/div>\n <div class=\"mr-score\" id=\"npk01-score\">\n <div class=\"mr-score-in\">\n <div class=\"mr-score-ey\">Round Complete<\/div>\n <div class=\"mr-ring\" id=\"npk01-ring\">\n <div class=\"mr-ring-in\">\n <span class=\"mr-ring-pct\" id=\"npk01-pct\">0%<\/span>\n <span class=\"mr-ring-sub\">net<\/span>\n <\/div>\n <\/div>\n <div class=\"mr-score-title\">Your Debrief<\/div>\n <div class=\"mr-score-net\" id=\"npk01-net\"><\/div>\n <div class=\"mr-verdict\" id=\"npk01-verdict\"><\/div>\n <div class=\"mr-bands\">\n <span class=\"mr-band mr-band-c\" id=\"npk01-ct-c\"><\/span>\n <span class=\"mr-band mr-band-w\" id=\"npk01-ct-w\"><\/span>\n <span class=\"mr-band mr-band-s\" id=\"npk01-ct-s\"><\/span>\n <\/div>\n <button class=\"mr-retry\" id=\"npk01-retry\">↻ New Round<\/button>\n <\/div>\n <\/div>\n <\/div>\n\n<\/div>\n\n<script>\n(function () {\n 'use strict';\n\n var NS = 'npk01';\n var TOTAL = 5;\n var MAX = 20;\n var LTRS = ['A','B','C','D'];\n\n var QS = [\n\n {\n id: 1,\n tag: 'First-Order Kinetics — Three Half-Lives',\n stem: 'A drug follows first-order elimination kinetics. What proportion of the drug is eliminated from the body after <strong>three half-lives<\/strong>?',\n correct: '87.5%',\n opts: [\n '87.5%',\n '75%',\n '94%',\n '12.5%'\n ],\n exp: 'In first-order kinetics, a <strong>fixed fraction<\/strong> (50%) is eliminated each half-life. Work it out step by step:<br><span class=\"calc\">After t½ 1: 50% eliminated → 50% remains<br>After t½ 2: 50% of 50% eliminated → 25% remains<br>After t½ 3: 50% of 25% eliminated → 12.5% remains<\/span>So <strong>100% − 12.5% = 87.5% eliminated<\/strong>. The trap answer 75% is what you get if you mistakenly add 25% per half-life (zero-order thinking). The residual 12.5% is what <em>remains<\/em>, not what is eliminated — a classic distractor.'\n },\n\n {\n id: 2,\n tag: 'Zero-Order Kinetics — Drug Remaining',\n stem: '<strong>500 mg<\/strong> of a drug was administered to a patient. <strong>100 mg<\/strong> was cleared in the first hour. Assuming <strong>zero-order kinetics<\/strong>, how much drug remains after <strong>3 hours<\/strong>?',\n correct: '200 mg',\n opts: [\n '200 mg',\n '400 mg',\n '300 mg',\n '100 mg'\n ],\n exp: 'Zero-order kinetics: a <strong>constant amount<\/strong> is eliminated per unit time, regardless of concentration. Here, 100 mg\/hour is the fixed rate.<span class=\"calc\">Hour 1: 500 − 100 = 400 mg remaining<br>Hour 2: 400 − 100 = 300 mg remaining<br>Hour 3: 300 − 100 = 200 mg remaining<\/span><strong>200 mg remains after 3 hours.<\/strong> Note: in first-order kinetics, the rate would have <em>slowed<\/em> as concentration fell. Zero-order is the exception — the enzyme or transporter is <strong>saturated<\/strong>, so rate stays flat. Classic examples: alcohol, phenytoin at high doses, aspirin in overdose.'\n },\n\n {\n id: 3,\n tag: 'First-Order Kinetics — Plasma Concentration',\n stem: 'A drug follows first-order kinetics with a <strong>half-life of 4 hours<\/strong>. The initial plasma concentration is <strong>80 mg\/L<\/strong>. What will the plasma concentration be after <strong>12 hours<\/strong>?',\n correct: '10 mg\/L',\n opts: [\n '10 mg\/L',\n '20 mg\/L',\n '5 mg\/L',\n '40 mg\/L'\n ],\n exp: '12 hours = <strong>3 half-lives<\/strong> (12 ÷ 4 = 3). In first-order kinetics, concentration halves with each half-life:<span class=\"calc\">After 4 h (t½ 1): 80 ÷ 2 = 40 mg\/L<br>After 8 h (t½ 2): 40 ÷ 2 = 20 mg\/L<br>After 12 h (t½ 3): 20 ÷ 2 = 10 mg\/L<\/span><strong>Answer: 10 mg\/L.<\/strong> Quick rule: after <em>n<\/em> half-lives, concentration = C<sub>0<\/sub> × (1\/2)<sup>n<\/sup>. Here: 80 × (1\/2)<sup>3<\/sup> = 80 × 1\/8 = <strong>10 mg\/L<\/strong>. The trap 20 mg\/L is after only 2 half-lives; 5 mg\/L would require 4 half-lives (16 hours).'\n },\n\n {\n id: 4,\n tag: 'First-Order Kinetics — Half-Life & % Remaining',\n stem: 'A drug has a <strong>half-life of 6 hours<\/strong> and follows first-order kinetics. What percentage of the drug <strong>remains<\/strong> in the body after <strong>24 hours<\/strong>?',\n correct: '6.25%',\n opts: [\n '6.25%',\n '12.5%',\n '25%',\n '3.125%'\n ],\n exp: '24 hours ÷ 6 hours per half-life = <strong>4 half-lives<\/strong>.<span class=\"calc\">After t½ 1 (6 h): 50% remains<br>After t½ 2 (12 h): 25% remains<br>After t½ 3 (18 h): 12.5% remains<br>After t½ 4 (24 h): 6.25% remains<\/span><strong>6.25% remains.<\/strong> Shortcut: (1\/2)<sup>4<\/sup> = 1\/16 = 0.0625 = <strong>6.25%<\/strong>. The trap 12.5% is after only 3 half-lives (18 h); 3.125% would require 5 half-lives (30 h). A useful anchor: after <strong>4–5 half-lives, ≥94% is eliminated<\/strong> — this is the clinical definition of drug washout.'\n },\n\n {\n id: 5,\n tag: 'Zero-Order Kinetics — Fixed Elimination Rate',\n stem: 'A drug following <strong>zero-order kinetics<\/strong> is administered as an infusion at <strong>50 mg\/hour<\/strong>. If the infusion is stopped after <strong>4 hours<\/strong>, how much drug has been <strong>eliminated<\/strong> during that period?',\n correct: '200 mg',\n opts: [\n '200 mg',\n '150 mg',\n '100 mg',\n '250 mg'\n ],\n exp: 'In zero-order kinetics, the elimination rate is <strong>constant<\/strong> and independent of concentration. The drug is eliminated at exactly 50 mg\/hour regardless of how much is present.<span class=\"calc\">Eliminated = Rate × Time<br>= 50 mg\/hr × 4 hr = <strong>200 mg<\/strong><\/span>This is the defining feature of zero-order kinetics: <strong>linear elimination over time<\/strong>, not exponential. Contrast with first-order: if this were first-order, the rate would slow as concentration fell, and the total eliminated in 4 hours would be less than 200 mg. Zero-order saturation kinetics are clinically dangerous — small dose increases cause disproportionate rises in plasma concentration.'\n }\n\n ];\n\n var answers = {}, answered = 0, shuffled = {}, done = false;\n\n function gid(s) { return document.getElementById(NS + '-' + s); }\n function byId(s) { return document.getElementById(s); }\n\n function shuffleArr(arr) {\n var a = arr.slice(), i, j, t;\n for (i = a.length - 1; i > 0; i--) {\n j = Math.floor(Math.random() * (i + 1));\n t = a[i]; a[i] = a[j]; a[j] = t;\n }\n return a;\n }\n\n function countVal(v) {\n var n = 0, k;\n for (k in answers) { if (answers[k] === v) n++; }\n return n;\n }\n\n function buildPips() {\n var cont = gid('pips'), i, q, wLine, wPip, line, pip;\n cont.innerHTML = '';\n for (i = 0; i < QS.length; i++) {\n q = QS[i];\n if (i > 0) {\n wLine = document.createElement('div');\n wLine.className = 'mr-pip-wrap';\n line = document.createElement('div');\n line.className = 'mr-pip-line';\n line.id = NS + '-pl' + q.id;\n wLine.appendChild(line);\n cont.appendChild(wLine);\n }\n wPip = document.createElement('div');\n wPip.className = 'mr-pip-wrap';\n pip = document.createElement('div');\n pip.className = 'mr-pip';\n pip.id = NS + '-pip' + q.id;\n pip.textContent = String(q.id);\n wPip.appendChild(pip);\n cont.appendChild(wPip);\n }\n }\n\n function build() {\n var cont, i, q, opts, card, top, numDiv, meta, tag, stem,\n rule, optsDiv, expDiv, lbl, txt, j, optEl, ltrSpan, txtSpan;\n\n cont = gid('cases');\n cont.innerHTML = '';\n answers = {}; answered = 0; shuffled = {}; done = false;\n gid('score').style.display = 'none';\n buildPips();\n\n for (i = 0; i < QS.length; i++) {\n q = QS[i];\n opts = shuffleArr(q.opts);\n shuffled[q.id] = opts;\n\n card = document.createElement('div');\n card.className = 'mr-case';\n\n top = document.createElement('div');\n top.className = 'mr-case-top';\n\n numDiv = document.createElement('div');\n numDiv.className = 'mr-num';\n numDiv.textContent = q.id < 10 ? 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12px}\n#npk01 .mr-bands{display:flex;justify-content:center;gap:10px;flex-wrap:wrap}\n#npk01 .mr-band{padding:5px 13px;border-radius:16px;font-size:0.78rem;font-weight:600}\n#npk01 .mr-band-c{background:var(--correct-bg);color:var(--correct)}\n#npk01 .mr-band-w{background:var(--wrong-bg);color:var(--wrong)}\n#npk01 .mr-band-s{background:var(--ob-pale);color:var(--ob)}\n#npk01 .mr-retry{\n display:block;margin:18px auto 4px;background:transparent;\n border:2px solid var(--ob);color:var(--ob);border-radius:8px;\n padding:9px 28px;font-family:'Playfair Display',serif;\n font-size:0.92rem;font-weight:700;cursor:pointer;\n}\n#npk01 .mr-retry:hover{background:var(--ob);color:#E4F4F9}\n\n@media(max-width:480px){\n #npk01 .mr-title{font-size:1.4rem}\n #npk01 .mr-num{font-size:1.7rem}\n #npk01 .mr-stem{font-size:0.9rem}\n #npk01 .mr-opt-text{font-size:0.86rem}\n}\n<\/style>\n\n<div id=\"npk01\">\n\n <div class=\"mr-header\">\n <div class=\"mr-series-tag\">Numerical Series · Pharmacokinetics<\/div>\n <div class=\"mr-eyebrow\">Morning Rounds · Round 01 of 07<\/div>\n <div class=\"mr-title\">Zero, First &<br><em>The Order of Elimination<\/em><\/div>\n <div class=\"mr-subtitle\">Five calculations · Know your kinetics cold before the exam does<\/div>\n <div class=\"mr-chips\">\n <span class=\"mr-chip\">5 Questions<\/span>\n <span class=\"mr-chip\">+4 \/ −1 scoring<\/span>\n <span class=\"mr-chip\">Options reshuffled<\/span>\n <\/div>\n <\/div>\n\n <div class=\"mr-sentinel\" id=\"npk01-sentinel\"><\/div>\n\n <div class=\"mr-progress\" id=\"npk01-progress\">\n <div class=\"mr-prog-inner\">\n <div class=\"mr-pips\" id=\"npk01-pips\"><\/div>\n <\/div>\n <\/div>\n\n <div class=\"mr-body\">\n <div id=\"npk01-cases\"><\/div>\n <div class=\"mr-submit-wrap\">\n <button class=\"mr-btn\" id=\"npk01-submit\">Submit for Debrief<\/button>\n <\/div>\n <div class=\"mr-score\" id=\"npk01-score\">\n <div class=\"mr-score-in\">\n <div class=\"mr-score-ey\">Round Complete<\/div>\n <div class=\"mr-ring\" id=\"npk01-ring\">\n <div class=\"mr-ring-in\">\n <span class=\"mr-ring-pct\" id=\"npk01-pct\">0%<\/span>\n <span class=\"mr-ring-sub\">net<\/span>\n <\/div>\n <\/div>\n <div class=\"mr-score-title\">Your Debrief<\/div>\n <div class=\"mr-score-net\" id=\"npk01-net\"><\/div>\n <div class=\"mr-verdict\" id=\"npk01-verdict\"><\/div>\n <div class=\"mr-bands\">\n <span class=\"mr-band mr-band-c\" id=\"npk01-ct-c\"><\/span>\n <span class=\"mr-band mr-band-w\" id=\"npk01-ct-w\"><\/span>\n <span class=\"mr-band mr-band-s\" id=\"npk01-ct-s\"><\/span>\n <\/div>\n <button class=\"mr-retry\" id=\"npk01-retry\">↻ New Round<\/button>\n <\/div>\n <\/div>\n <\/div>\n\n<\/div>\n\n<script>\n(function () {\n 'use strict';\n\n var NS = 'npk01';\n var TOTAL = 5;\n var MAX = 20;\n var LTRS = ['A','B','C','D'];\n\n var QS = [\n\n {\n id: 1,\n tag: 'First-Order Kinetics — Three Half-Lives',\n stem: 'A drug follows first-order elimination kinetics. What proportion of the drug is eliminated from the body after <strong>three half-lives<\/strong>?',\n correct: '87.5%',\n opts: [\n '87.5%',\n '75%',\n '94%',\n '12.5%'\n ],\n exp: 'In first-order kinetics, a <strong>fixed fraction<\/strong> (50%) is eliminated each half-life. Work it out step by step:<br><span class=\"calc\">After t½ 1: 50% eliminated → 50% remains<br>After t½ 2: 50% of 50% eliminated → 25% remains<br>After t½ 3: 50% of 25% eliminated → 12.5% remains<\/span>So <strong>100% − 12.5% = 87.5% eliminated<\/strong>. The trap answer 75% is what you get if you mistakenly add 25% per half-life (zero-order thinking). The residual 12.5% is what <em>remains<\/em>, not what is eliminated — a classic distractor.'\n },\n\n {\n id: 2,\n tag: 'Zero-Order Kinetics — Drug Remaining',\n stem: '<strong>500 mg<\/strong> of a drug was administered to a patient. <strong>100 mg<\/strong> was cleared in the first hour. Assuming <strong>zero-order kinetics<\/strong>, how much drug remains after <strong>3 hours<\/strong>?',\n correct: '200 mg',\n opts: [\n '200 mg',\n '400 mg',\n '300 mg',\n '100 mg'\n ],\n exp: 'Zero-order kinetics: a <strong>constant amount<\/strong> is eliminated per unit time, regardless of concentration. Here, 100 mg\/hour is the fixed rate.<span class=\"calc\">Hour 1: 500 − 100 = 400 mg remaining<br>Hour 2: 400 − 100 = 300 mg remaining<br>Hour 3: 300 − 100 = 200 mg remaining<\/span><strong>200 mg remains after 3 hours.<\/strong> Note: in first-order kinetics, the rate would have <em>slowed<\/em> as concentration fell. Zero-order is the exception — the enzyme or transporter is <strong>saturated<\/strong>, so rate stays flat. Classic examples: alcohol, phenytoin at high doses, aspirin in overdose.'\n },\n\n {\n id: 3,\n tag: 'First-Order Kinetics — Plasma Concentration',\n stem: 'A drug follows first-order kinetics with a <strong>half-life of 4 hours<\/strong>. The initial plasma concentration is <strong>80 mg\/L<\/strong>. What will the plasma concentration be after <strong>12 hours<\/strong>?',\n correct: '10 mg\/L',\n opts: [\n '10 mg\/L',\n '20 mg\/L',\n '5 mg\/L',\n '40 mg\/L'\n ],\n exp: '12 hours = <strong>3 half-lives<\/strong> (12 ÷ 4 = 3). In first-order kinetics, concentration halves with each half-life:<span class=\"calc\">After 4 h (t½ 1): 80 ÷ 2 = 40 mg\/L<br>After 8 h (t½ 2): 40 ÷ 2 = 20 mg\/L<br>After 12 h (t½ 3): 20 ÷ 2 = 10 mg\/L<\/span><strong>Answer: 10 mg\/L.<\/strong> Quick rule: after <em>n<\/em> half-lives, concentration = C<sub>0<\/sub> × (1\/2)<sup>n<\/sup>. Here: 80 × (1\/2)<sup>3<\/sup> = 80 × 1\/8 = <strong>10 mg\/L<\/strong>. The trap 20 mg\/L is after only 2 half-lives; 5 mg\/L would require 4 half-lives (16 hours).'\n },\n\n {\n id: 4,\n tag: 'First-Order Kinetics — Half-Life & % Remaining',\n stem: 'A drug has a <strong>half-life of 6 hours<\/strong> and follows first-order kinetics. What percentage of the drug <strong>remains<\/strong> in the body after <strong>24 hours<\/strong>?',\n correct: '6.25%',\n opts: [\n '6.25%',\n '12.5%',\n '25%',\n '3.125%'\n ],\n exp: '24 hours ÷ 6 hours per half-life = <strong>4 half-lives<\/strong>.<span class=\"calc\">After t½ 1 (6 h): 50% remains<br>After t½ 2 (12 h): 25% remains<br>After t½ 3 (18 h): 12.5% remains<br>After t½ 4 (24 h): 6.25% remains<\/span><strong>6.25% remains.<\/strong> Shortcut: (1\/2)<sup>4<\/sup> = 1\/16 = 0.0625 = <strong>6.25%<\/strong>. The trap 12.5% is after only 3 half-lives (18 h); 3.125% would require 5 half-lives (30 h). A useful anchor: after <strong>4–5 half-lives, ≥94% is eliminated<\/strong> — this is the clinical definition of drug washout.'\n },\n\n {\n id: 5,\n tag: 'Zero-Order Kinetics — Fixed Elimination Rate',\n stem: 'A drug following <strong>zero-order kinetics<\/strong> is administered as an infusion at <strong>50 mg\/hour<\/strong>. If the infusion is stopped after <strong>4 hours<\/strong>, how much drug has been <strong>eliminated<\/strong> during that period?',\n correct: '200 mg',\n opts: [\n '200 mg',\n '150 mg',\n '100 mg',\n '250 mg'\n ],\n exp: 'In zero-order kinetics, the elimination rate is <strong>constant<\/strong> and independent of concentration. The drug is eliminated at exactly 50 mg\/hour regardless of how much is present.<span class=\"calc\">Eliminated = Rate × Time<br>= 50 mg\/hr × 4 hr = <strong>200 mg<\/strong><\/span>This is the defining feature of zero-order kinetics: <strong>linear elimination over time<\/strong>, not exponential. Contrast with first-order: if this were first-order, the rate would slow as concentration fell, and the total eliminated in 4 hours would be less than 200 mg. Zero-order saturation kinetics are clinically dangerous — small dose increases cause disproportionate rises in plasma concentration.'\n }\n\n ];\n\n var answers = {}, answered = 0, shuffled = {}, done = false;\n\n function gid(s) { return document.getElementById(NS + '-' + s); }\n function byId(s) { return document.getElementById(s); }\n\n function shuffleArr(arr) {\n var a = arr.slice(), i, j, t;\n for (i = a.length - 1; i > 0; i--) {\n j = Math.floor(Math.random() * (i + 1));\n t = a[i]; a[i] = a[j]; a[j] = t;\n }\n return a;\n }\n\n function countVal(v) {\n var n = 0, k;\n for (k in answers) { if (answers[k] === v) n++; }\n return n;\n }\n\n function buildPips() {\n var cont = gid('pips'), i, q, wLine, wPip, line, pip;\n cont.innerHTML = '';\n for (i = 0; i < QS.length; i++) {\n q = QS[i];\n if (i > 0) {\n wLine = document.createElement('div');\n wLine.className = 'mr-pip-wrap';\n line = document.createElement('div');\n line.className = 'mr-pip-line';\n line.id = NS + '-pl' + q.id;\n wLine.appendChild(line);\n cont.appendChild(wLine);\n }\n wPip = document.createElement('div');\n wPip.className = 'mr-pip-wrap';\n pip = document.createElement('div');\n pip.className = 'mr-pip';\n pip.id = NS + '-pip' + q.id;\n pip.textContent = String(q.id);\n wPip.appendChild(pip);\n cont.appendChild(wPip);\n }\n }\n\n function build() {\n var cont, i, q, opts, card, top, numDiv, meta, tag, stem,\n rule, optsDiv, expDiv, lbl, txt, j, optEl, ltrSpan, txtSpan;\n\n cont = gid('cases');\n cont.innerHTML = '';\n answers = {}; answered = 0; shuffled = {}; done = false;\n gid('score').style.display = 'none';\n buildPips();\n\n for (i = 0; i < QS.length; i++) {\n q = QS[i];\n opts = shuffleArr(q.opts);\n shuffled[q.id] = opts;\n\n card = document.createElement('div');\n card.className = 'mr-case';\n\n top = document.createElement('div');\n top.className = 'mr-case-top';\n\n numDiv = document.createElement('div');\n numDiv.className = 'mr-num';\n numDiv.textContent = q.id < 10 ? '0' + q.id : String(q.id);\n\n meta = document.createElement('div');\n meta.className = 'mr-meta';\n\n tag = document.createElement('div');\n tag.className = 'mr-tag';\n tag.innerHTML = q.tag;\n\n stem = document.createElement('div');\n stem.className = 'mr-stem';\n stem.innerHTML = q.stem;\n\n meta.appendChild(tag);\n meta.appendChild(stem);\n top.appendChild(numDiv);\n top.appendChild(meta);\n card.appendChild(top);\n\n rule = document.createElement('div');\n rule.className = 'mr-rule';\n card.appendChild(rule);\n\n optsDiv = document.createElement('div');\n optsDiv.className = 'mr-opts';\n\n for (j = 0; j < opts.length; j++) {\n optEl = document.createElement('div');\n optEl.className = 'mr-opt';\n optEl.id = NS + '-o' + q.id + '-' + j;\n optEl.setAttribute('role', 'button');\n optEl.setAttribute('tabindex', '0');\n\n ltrSpan = document.createElement('span');\n ltrSpan.className = 'mr-ltr';\n ltrSpan.textContent = LTRS[j];\n\n txtSpan = document.createElement('span');\n txtSpan.className = 'mr-opt-text';\n txtSpan.innerHTML = opts[j];\n\n optEl.appendChild(ltrSpan);\n optEl.appendChild(txtSpan);\n optsDiv.appendChild(optEl);\n\n (function (qid, oi) {\n optEl.addEventListener('click', function () { pick(qid, oi); });\n }(q.id, j));\n }\n card.appendChild(optsDiv);\n\n expDiv = document.createElement('div');\n expDiv.className = 'mr-exp';\n expDiv.id = NS + '-exp' + q.id;\n\n lbl = document.createElement('div');\n lbl.className = 'mr-exp-lbl';\n lbl.textContent = 'Debrief';\n\n txt = document.createElement('div');\n txt.className = 'mr-exp-text';\n txt.innerHTML = q.exp;\n\n expDiv.appendChild(lbl);\n expDiv.appendChild(txt);\n card.appendChild(expDiv);\n cont.appendChild(card);\n }\n }\n\n function pick(qid, oi) {\n var q, opts, i, el, correct;\n if (answers[qid] !== undefined || done) return;\n\n q = null;\n for (i = 0; i < QS.length; i++) {\n if (QS[i].id === qid) { q = QS[i]; break; }\n }\n if (!q) return;\n\n opts = shuffled[qid];\n correct = (opts[oi] === q.correct);\n answers[qid] = correct ? 'c' : 'w';\n answered++;\n\n for (i = 0; i < opts.length; i++) {\n el = byId(NS + '-o' + qid + '-' + i);\n if (opts[i] === q.correct) {\n el.className = 'mr-opt correct locked';\n } else if (i === oi) {\n el.className = 'mr-opt wrong locked';\n } else {\n el.className = 'mr-opt dimmed locked';\n }\n }\n\n byId(NS + '-exp' + qid).style.display = 'block';\n byId(NS + '-pip' + qid).className = 'mr-pip ' + (correct ? 'correct' : 'wrong');\n\n if (qid > 1) {\n var pl = byId(NS + '-pl' + qid);\n if (pl) { pl.className = 'mr-pip-line done'; }\n }\n }\n\n function showScore() {\n var c, w, s, net, pct, disp, verdicts, vi, sc;\n if (done) return;\n done = true;\n\n c = countVal('c');\n w = countVal('w');\n s = TOTAL - answered;\n net = (c * 4) - w;\n pct = Math.max(0, Math.round((net \/ MAX) * 100));\n disp = Math.min(100, Math.max(0, pct));\n\n gid('ring').style.background =\n 'conic-gradient(#1A5F7A ' + disp + '%, #B8D8E3 0%)';\n\n gid('pct').textContent = pct + '%';\n gid('net').textContent = 'Net Score: ' + net + ' \/ ' + MAX;\n\n verdicts = [\n [5, 'Flawless. Zero-order, first-order, half-life arithmetic \\u2014 all locked in cold.'],\n [4, 'Strong round. One calculation slipped \\u2014 the debrief will nail it down.'],\n [3, 'Solid base. The fixed-fraction vs fixed-amount distinction is where the gaps are.'],\n [2, 'Halfway. 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