@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;500;600;700;800&family=Manrope:wght@400;500;600;700;800&display=swap');
:root{font:15px/1.7 'DM Sans',system-ui,-apple-system,'Segoe UI',sans-serif;color:#25374c;background:#f5f7fb;--ink:#172e4b;--sub:#61738b;--line:#e0e8f1;--blue:#2966c7;--teal:#0c978c;--surface:#fff}*{box-sizing:border-box}body{margin:0}button,input,textarea{font:inherit}button{cursor:pointer}header.topbar{height:88px;background:#fff;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:14px 35px}.brand{display:flex;gap:13px;align-items:center}.brand strong{font:800 21px/1.25 Manrope,system-ui,sans-serif;color:var(--ink);display:block;letter-spacing:-.6px}.brand small{display:block;color:var(--sub);font-size:12px}.mark{background:#e9f2ff;border:1px solid #d6e6fa;border-radius:14px;padding:7px;display:grid;place-items:center}.edition{font-size:10px;color:#72849b;letter-spacing:1.7px;font-weight:800}.edition b{color:var(--blue);background:#eaf2ff;padding:6px 9px;border-radius:7px;margin-left:8px}.shell{display:grid;grid-template-columns:270px minmax(0,1fr);min-height:calc(100vh - 88px)}aside{padding:28px 16px;background:#fff;border-right:1px solid var(--line)}.side-title{font-size:10px;color:#91a0b1;font-weight:800;letter-spacing:1.4px;margin:4px 14px 14px}.side-title.second{margin-top:32px}.side-foot{font-size:12px;color:#6c7d91;padding:23px 14px;margin-top:28px;border-top:1px solid var(--line)}.side-foot span:last-child{color:#9ba9b9}.privacy-dot{display:inline-block;width:8px;height:8px;background:#23b69c;border-radius:50%;margin-right:6px}main{max-width:1220px;width:100%;padding:35px 45px 90px;margin:0 auto}.nav,.btn{border:1px solid transparent;border-radius:11px;padding:11px 14px;text-align:left;transition:background .15s,border .15s,transform .15s}.nav{width:100%;display:block;margin:4px 0;font-size:13px;color:#4c617a;background:transparent;font-weight:600}.nav:hover,.nav.active{background:#eaf2fd;color:#205bb3}.nav.active{border-left:3px solid var(--blue)}.nav .done{color:var(--teal)}.btn{display:inline-block;background:#2966c7;color:white;font-weight:800;text-decoration:none;margin:5px 8px 5px 0;font-size:13px}.btn:hover{background:#174eac;transform:translateY(-1px)}.btn.secondary{background:#eef4fc;color:#255ca8;border-color:#d9e6f7}.btn.secondary:hover{background:#dfeafb}.btn:disabled{opacity:.5;cursor:not-allowed}.card{background:var(--surface);border:1px solid var(--line);box-shadow:0 5px 20px rgba(25,54,90,.035);border-radius:17px;padding:26px;margin:18px 0}.hero{position:relative;overflow:hidden;background:linear-gradient(115deg,#e7f2ff,#f2faf8 75%);border:1px solid #d8e8f5;padding:37px 40px;min-height:290px}.hero-content{position:relative;z-index:1;max-width:60%}.hero-visual{position:absolute;right:0;top:0;height:100%;width:42%;object-fit:contain;object-position:center right;filter:drop-shadow(0 15px 18px rgba(35,80,130,.07))}.muted{color:var(--sub)}.eyebrow{color:var(--teal);font-size:10px;font-weight:800;letter-spacing:1.5px;text-transform:uppercase}.grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.grid .card{margin:0}.course-card{position:relative;overflow:hidden;min-height:224px;display:flex;flex-direction:column;align-items:flex-start;padding-right:115px}.course-card .btn{margin-top:auto}.course-art{position:absolute;right:8px;top:23px;width:112px;height:112px;object-fit:contain}.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:22px}.stat{padding:14px 17px;background:#fff9;border:1px solid #d7e6ef;border-radius:12px}.stat strong{display:block;font:800 26px Manrope,system-ui;color:#174a8b}.stat small{color:#607a91;font-size:12px}h1,h2,h3{line-height:1.3;color:var(--ink);font-family:Manrope,system-ui,sans-serif;letter-spacing:-.6px}h1{font-size:30px;margin:12px 0}h2{font-size:24px}h3{font-size:17px}p{color:#50637b}article p{line-height:1.95;margin:16px 0}article code{background:#eaf1f8;border-radius:5px;padding:2px 5px;color:#234e82}article strong{color:#233d5a}.progress{height:9px;border-radius:12px;background:#e9eef5;overflow:hidden;margin:12px 0}.progress div{height:100%;background:linear-gradient(90deg,#28b69f,#3d8dca);border-radius:12px}.choice{display:block;padding:14px;border:1px solid #dce6f0;border-radius:10px;margin:10px 0;cursor:pointer;background:#f9fbfe;color:#354a62}.choice:hover{background:#eaf3ff;border-color:#b8d5f5}.choice input{margin-right:12px;accent-color:#2966c7}.feedback{background:#edf5fb;padding:16px;border-radius:10px;margin:16px 0}.feedback.good{border-left:4px solid #1fa78b}.feedback.bad{border-left:4px solid #dc9851}.tag{display:inline-block;background:#e8f2ff;color:#255eaa;font-size:11px;font-weight:800;letter-spacing:.6px;padding:5px 9px;border-radius:6px}.practice{width:100%;min-height:160px;border:1px solid #cbd9e7;border-radius:10px;background:#fbfdff;color:#243950;padding:15px;resize:vertical}.actions{display:flex;flex-wrap:wrap;gap:7px;margin:20px 0}.count{color:#71859b;font-size:12px}.chapter-row{display:flex;justify-content:space-between;gap:15px;align-items:center}.chapter-row h3{margin:7px 0}.chapter-row p{margin:5px 0}a{color:#2467bf}.case-choice{display:block;width:100%;margin:9px 0;background:#f4f8fd;border:1px solid #e0e8f2}.case-meta{font-size:12px;color:#8294a8}.divider{border-top:1px solid var(--line);margin:20px 0}.module-hero{display:flex;align-items:center;justify-content:space-between;gap:24px;background:linear-gradient(110deg,#e9f3ff,#f7fcfb);border:1px solid #dcebf4;border-radius:18px;padding:22px 28px;margin-bottom:18px}.module-hero img{width:128px;height:128px}.module-hero h1{margin:8px 0}.case-hero{background:#edf7f7}.case-hero img{width:125px}@media(max-width:1050px){main{padding:28px 24px 65px}.hero-content{max-width:65%}.hero-visual{width:36%}.course-card{padding-right:95px}.course-art{width:90px;height:90px}}@media(max-width:820px){.shell{display:block}aside{border-right:0;border-bottom:1px solid var(--line);padding:12px}main{padding:20px 16px 55px}.grid,.stats{grid-template-columns:1fr}.edition{display:none}header.topbar{padding:12px 16px;height:75px}.brand strong{font-size:19px}.chapter-row{display:block}.hero{padding:24px}.hero-content{max-width:100%}.hero-visual{position:relative;width:100%;height:160px;object-position:center;margin-top:10px}.course-card{padding-right:112px}.course-art{width:100px;height:100px}.module-hero img{width:82px;height:82px}}@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}

/* v6: contained illustrations, spacious layout and accessible theme controls */
.header-actions{display:flex;align-items:center;gap:18px}.theme-toggle{border:1px solid var(--line);border-radius:10px;background:var(--surface);color:var(--ink);padding:9px 13px;font-weight:700;font-size:12px;white-space:nowrap}.theme-toggle:hover{border-color:var(--blue)}
main{max-width:1440px}.hero{display:grid;grid-template-columns:minmax(0,1fr) minmax(230px,32%);align-items:center;gap:24px;min-height:0}.hero-content{max-width:none;min-width:0}.hero-art-wrap{display:flex;align-items:center;justify-content:center;min-width:0;align-self:stretch}.hero-visual{position:static;display:block;width:100%;height:auto;max-height:250px;object-fit:contain}.course-card{padding-right:125px}.course-card h3,.course-card p{position:relative;z-index:1}.course-art{width:92px;height:92px;right:12px;top:30px}.course-card h3{max-width:100%;overflow-wrap:anywhere}
@media(max-width:1050px){.hero{grid-template-columns:minmax(0,1fr) 27%;gap:12px}.hero-visual{max-height:190px}.course-card{padding-right:100px}.course-art{width:74px;height:74px}}
@media(max-width:820px){.hero{grid-template-columns:1fr}.hero-art-wrap{max-height:170px}.hero-visual{max-height:165px}.course-card{padding-right:105px}.header-actions{gap:8px}}
@media(max-width:420px){.course-card{padding-right:25px;padding-top:110px}.course-art{top:12px;left:22px;right:auto;width:82px;height:82px}.theme-toggle{font-size:11px;padding:8px}}
:root[data-theme="dark"]{color-scheme:dark;--ink:#e8f1ff;--sub:#aabbd1;--line:#304158;--blue:#79b4ff;--teal:#4ad5bf;--surface:#18283d;color:#d9e6f6;background:#0d1727}
[data-theme="dark"] body{background:#0d1727;color:#d9e6f6}
[data-theme="dark"] header.topbar,[data-theme="dark"] aside{background:#132238}
[data-theme="dark"] main{background:#0d1727}
[data-theme="dark"] .brand small,[data-theme="dark"] .edition,[data-theme="dark"] .side-foot,[data-theme="dark"] .count,[data-theme="dark"] .side-title{color:#aabbd1}
[data-theme="dark"] .mark,[data-theme="dark"] .edition b{background:#203b5d;border-color:#355276;color:#b9d8ff}
[data-theme="dark"] .nav{color:#c3d4e9}[data-theme="dark"] .nav:hover,[data-theme="dark"] .nav.active{background:#243d5c;color:#fff}
[data-theme="dark"] .hero,[data-theme="dark"] .module-hero{background:linear-gradient(115deg,#1a3654,#17383b);border-color:#35536b}
[data-theme="dark"] .card{box-shadow:none}[data-theme="dark"] .stat{background:#1c3550;border-color:#365371}[data-theme="dark"] .stat strong{color:#a5d4ff}[data-theme="dark"] .stat small{color:#b6cbe0}
[data-theme="dark"] p,[data-theme="dark"] .muted,[data-theme="dark"] .side-foot span:last-child{color:#b7c8dc}
[data-theme="dark"] .btn{background:#3476d2;color:#fff}[data-theme="dark"] .btn.secondary{background:#263e5b;color:#d3e7ff;border-color:#3d5875}
[data-theme="dark"] .progress{background:#33465e}[data-theme="dark"] .choice,[data-theme="dark"] .case-choice{background:#20344e;color:#e4edfa;border-color:#3c536c}[data-theme="dark"] .choice:hover{background:#2c4969}
[data-theme="dark"] .feedback{background:#223952}[data-theme="dark"] .tag{background:#28466a;color:#c4e0ff}[data-theme="dark"] .practice{background:#102238;color:#e8f1ff;border-color:#4a607b}
[data-theme="dark"] article code{background:#284362;color:#d2eaff}[data-theme="dark"] article strong{color:#eaf4ff}[data-theme="dark"] a{color:#92c4ff}

/* v7 investigation workstation */
.case-toolbar{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:12px}.evidence-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;margin-top:18px}.evidence-grid>div{border:1px solid var(--line);background:var(--surface);border-radius:12px;padding:14px;min-width:0}.evidence-grid strong{color:var(--ink)}.evidence-grid p{margin:5px 0;overflow-wrap:anywhere}.case-hero p{max-width:650px}.card label[for="case-notes"]{display:block;font-weight:700;color:var(--ink);margin-bottom:10px}@media(max-width:680px){.evidence-grid{grid-template-columns:1fr}}

/* Immediate assessment feedback */
.choice.quiz-correct-choice{border-color:#19a681;background:#e6f8f1;color:#135a46}
.choice.quiz-wrong-choice{border-color:#d18b60;background:#fff0e7;color:#844221}
.choice:has(input:disabled){cursor:default}
[data-theme="dark"] .choice.quiz-correct-choice{background:#163f36;color:#b5f6db;border-color:#35b990}
[data-theme="dark"] .choice.quiz-wrong-choice{background:#4b302a;color:#ffdac4;border-color:#c88a6b}

/* Evidence library */
.evidence-cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(225px,1fr));gap:14px;margin-top:18px}
.evidence-item{border:1px solid var(--line,#d8e2e8);border-radius:12px;padding:16px;min-width:0}
.evidence-item .case-toolbar{flex-wrap:wrap;align-items:start}
.evidence-detail{border-top:1px solid var(--line,#d8e2e8);margin-top:12px;padding-top:12px}
.evidence-detail p:first-child{white-space:pre-line;overflow-wrap:anywhere}
.evidence-item .tag{white-space:nowrap}

/* v14 progress reset */
.reset-actions{display:flex;flex-wrap:wrap;gap:12px;align-items:center;margin-top:18px;padding-top:16px;border-top:1px solid var(--line)}
.reset-dialog{border:1px solid var(--line);border-radius:16px;background:var(--surface);color:var(--ink);padding:28px;max-width:min(92vw,540px);box-shadow:0 20px 65px #0005}
.reset-dialog::backdrop{background:#0b1528b8}.reset-dialog h2{margin-top:0}.reset-dialog label{display:block;margin:15px 0 7px}.reset-dialog input{width:100%;padding:12px;border:1px solid var(--line);border-radius:8px;background:var(--surface);color:var(--ink);font:inherit}.reset-dialog .actions{margin-top:20px;justify-content:flex-end}
.btn.reset-danger{background:#a52e3d;color:white}.btn.reset-danger:disabled{opacity:.4;cursor:not-allowed}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap}

/* v15 investigation toolkit */
.lab-terminal{white-space:pre-wrap;overflow-wrap:anywhere;background:#102033;color:#d3f7ed;padding:20px;border-radius:12px;min-height:130px;font:14px/1.65 ui-monospace,SFMono-Regular,Consolas,monospace;margin-top:15px}
.reference-row{padding:12px 0;border-bottom:1px solid var(--line,#dbe4ee)}.reference-row:last-child{border-bottom:0}.reference-row h3{margin:0 0 6px}.reference-row p{margin:0}.card select{max-width:100%;padding:10px;border-radius:8px}

.record-sample{white-space:pre-wrap;overflow-wrap:anywhere;background:var(--surface,#eef2f7);border:1px solid #a4adba55;padding:1rem;border-radius:12px;font:0.9rem/1.5 ui-monospace,SFMono-Regular,Consolas,monospace}textarea.practice{min-height:90px}details>summary{cursor:pointer;padding:.5rem 0}#progress-restore{font-size:.85rem}