:root{--ink:#17202a;--muted:#5b6673;--paper:#f7f9fb;--surface:#fff;--line:#d9e0e7;--navy:#173a5e;--teal:#087f75;--amber:#b66a12;--red:#a43a42;--focus:#006fd6;--shadow:0 10px 28px rgba(18,35,52,.08)}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;color:var(--ink);background:var(--paper);font-family:Inter,Aptos,"Segoe UI",Arial,sans-serif;line-height:1.55}a{color:inherit}button,input,select{font:inherit}:focus-visible{outline:3px solid rgba(0,111,214,.35);outline-offset:3px}
.site-header{min-height:66px;padding:0 5vw;display:flex;align-items:center;justify-content:space-between;gap:24px;background:var(--surface);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20}.course-mark{display:flex;align-items:baseline;gap:10px;text-decoration:none;font-weight:650}.course-code{color:var(--navy);font-size:1.08rem;font-weight:800}.top-nav{display:flex;gap:22px}.top-nav a{color:var(--muted);text-decoration:none;font-size:.92rem}.top-nav a:hover{color:var(--navy)}
main{min-height:calc(100vh - 130px)}.course-overview{min-height:430px;padding:70px 7vw 54px;display:grid;grid-template-columns:minmax(0,1.6fr) minmax(280px,.7fr);gap:8vw;align-items:end;background:var(--surface);border-bottom:1px solid var(--line)}.eyebrow{margin:0 0 7px;color:var(--teal);font-weight:800;text-transform:uppercase;letter-spacing:.08em;font-size:.76rem}h1,h2,h3{margin-top:0;line-height:1.14}h1{margin-bottom:18px;font-size:clamp(2.5rem,5vw,5rem);max-width:930px}h2{margin-bottom:12px;font-size:clamp(1.7rem,3vw,2.65rem)}h3{font-size:1.1rem}.lede{max-width:800px;color:var(--muted);font-size:clamp(1.05rem,1.8vw,1.35rem)}.course-facts{margin:0;border-top:3px solid var(--navy)}.course-facts div{padding:13px 0;display:grid;grid-template-columns:1fr 1.2fr;gap:16px;border-bottom:1px solid var(--line)}.course-facts dt{color:var(--muted);font-size:.84rem}.course-facts dd{margin:0;font-weight:700}
.section{padding:62px 7vw}.section-heading{margin-bottom:30px;display:flex;justify-content:space-between;align-items:end;gap:36px}.section-heading>p{max-width:560px;color:var(--muted)}.lecture-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.lecture-card{min-height:330px;padding:0 22px 21px;display:flex;flex-direction:column;text-decoration:none;background:var(--surface);border:1px solid var(--line);border-radius:6px;overflow:hidden;transition:transform .18s ease,box-shadow .18s ease}.lecture-card:hover{transform:translateY(-3px);box-shadow:var(--shadow)}.lecture-visual{width:calc(100% + 44px);height:130px;margin:0 -22px 18px;display:grid;place-items:center;color:#d9edf0;background:linear-gradient(135deg,#173a5e,#087f75);font-size:3.4rem;font-weight:850}.lecture-number{color:var(--teal);font-size:.78rem;font-weight:850;letter-spacing:.08em}.lecture-card h3{margin:5px 0 8px}.lecture-card p{margin:0 0 18px;color:var(--muted)}.card-action{margin-top:auto;color:var(--navy);font-weight:750}
.practice-band{padding:54px 7vw 60px;color:#fff;background:#162d43}.practice-band .eyebrow{color:#67d3c7}.practice-steps{margin:28px 0 34px;display:grid;grid-template-columns:repeat(3,1fr);border-top:1px solid rgba(255,255,255,.22)}.practice-steps div{padding:22px 28px 10px 0}.practice-steps span{color:#67d3c7}.practice-steps h3{margin:5px 0}.practice-steps p{margin:0;color:#c9d7e3}.button{min-height:42px;padding:9px 15px;display:inline-flex;align-items:center;justify-content:center;border:1px solid transparent;border-radius:5px;text-decoration:none;font-weight:750;cursor:pointer}.button-primary{color:#fff;background:var(--teal)}.button-primary:hover{background:#066c64}.button-secondary{color:var(--navy);background:var(--surface);border-color:#b8c6d3}.button-secondary:hover{border-color:var(--navy)}.button-row{display:flex;flex-wrap:wrap;gap:10px}
.resources{background:var(--surface)}.resource-list{border-top:1px solid var(--line)}.resource-list a{padding:17px 0;display:grid;grid-template-columns:minmax(220px,.7fr) 1fr;gap:24px;text-decoration:none;border-bottom:1px solid var(--line)}.resource-list span{color:var(--muted)}footer{min-height:64px;padding:0 5vw;display:flex;align-items:center;justify-content:space-between;color:var(--muted);background:var(--surface);border-top:1px solid var(--line);font-size:.86rem}
.lecture-header{padding:24px 5vw;display:flex;justify-content:space-between;gap:24px;background:var(--surface);border-bottom:1px solid var(--line)}.lecture-header nav{display:flex;flex-wrap:wrap;gap:16px}.lecture-header nav a{color:var(--muted);text-decoration:none;font-size:.88rem}.lecture-hero{padding:68px 7vw;background:var(--surface);border-bottom:1px solid var(--line)}.lecture-hero h1{margin-bottom:14px}.lecture-shell{width:min(1120px,100%);margin:auto;padding:30px 5vw 70px}.lecture-section{padding:34px 0;border-bottom:1px solid var(--line)}.objectives{padding-left:22px;columns:2;column-gap:44px}.objectives li{margin:0 0 9px;break-inside:avoid}.concept-list{display:grid;gap:8px}.concept-list details{background:var(--surface);border:1px solid var(--line);border-radius:5px}.concept-list summary{padding:15px 18px;cursor:pointer;font-weight:800}.concept-list p{margin:0;padding:0 18px 17px;color:var(--muted)}.workflow{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}.workflow>div{padding:20px;background:var(--surface);border:1px solid var(--line);border-top:3px solid var(--teal)}.workflow span{color:var(--teal);font-weight:850}.workflow h3{margin:6px 0}.workflow p{margin:0;color:var(--muted)}
.quiz-status{margin-bottom:12px;display:flex;justify-content:space-between;color:var(--muted);font-size:.88rem}.quiz-question,.problem-output,.practice-panel{padding:24px;background:var(--surface);border:1px solid var(--line);border-radius:6px}.quiz-options,.tf-options{display:grid;gap:9px;margin:16px 0}.quiz-option{padding:12px 14px;text-align:left;color:var(--ink);background:#f7f9fb;border:1px solid #cbd5df;border-radius:4px;cursor:pointer}.quiz-option:hover{border-color:var(--navy)}.quiz-option.is-correct{color:#075d48;background:#e5f5ef;border-color:#7abda6}.quiz-option.is-wrong{color:#8a2530;background:#fbeaec;border-color:#dfafb4}.quiz-feedback{min-height:25px;color:var(--muted);font-weight:650}.practice-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px}.practice-controls{margin-bottom:18px;display:grid;grid-template-columns:1fr 1fr auto;gap:12px;align-items:end}.practice-controls label{display:grid;gap:5px;color:var(--muted);font-size:.85rem}.practice-controls select,.practice-controls input{min-height:42px;padding:8px 10px;background:#fff;border:1px solid #b8c6d3;border-radius:4px}.problem-meta{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:13px}.problem-meta span{padding:4px 8px;color:var(--navy);background:#eaf1f6;border-radius:3px;font-size:.78rem;font-weight:750}.solution{margin-top:18px;padding-top:17px;border-top:2px solid var(--teal)}.solution h4{margin:0 0 8px}.takeaway-summary{color:var(--muted);font-size:1.05rem}.takeaway-list{padding-left:23px}.takeaway-list li{margin-bottom:9px}.matrix{width:100%;border-collapse:collapse;margin:14px 0}.matrix th,.matrix td{padding:10px;text-align:left;border:1px solid var(--line)}.matrix th{background:#eef3f7}.practice-page{width:min(1120px,100%);margin:auto;padding:54px 5vw 80px}.practice-page h1{font-size:clamp(2.4rem,5vw,4.5rem)}.case-question{font-size:1.05rem}.case-steps{padding-left:22px}
@media(max-width:880px){.course-overview{grid-template-columns:1fr;min-height:auto}.lecture-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.section-heading{display:block}.workflow,.practice-grid{grid-template-columns:1fr}.objectives{columns:1}.practice-controls{grid-template-columns:1fr}.top-nav{display:none}}
@media(max-width:560px){.lecture-grid{grid-template-columns:1fr}.practice-steps{grid-template-columns:1fr}.resource-list a{grid-template-columns:1fr;gap:4px}.course-overview,.section,.practice-band,.lecture-hero{padding-left:5vw;padding-right:5vw}.lecture-header{display:block}.lecture-header nav{margin-top:12px}footer{display:block;padding-top:18px;padding-bottom:18px}}

/* Interactive lecture pages */
.container{width:min(1160px,90vw);margin-inline:auto}.lecture-header{padding:0;color:#fff;background:linear-gradient(135deg,#102d49 0%,#173a5e 58%,#087f75 145%);border:0;display:block}.lecture-header .container{padding-top:22px;padding-bottom:48px}.topbar{display:flex;align-items:center;justify-content:space-between;padding-bottom:48px}.topbar .brand{color:#fff;font-size:1.15rem;font-weight:850;letter-spacing:.04em}.top-links{display:flex;gap:20px}.lecture-header .topbar a{color:#d7e6ef}.lecture-header .topbar a:hover{color:#fff}.lecture-header .eyebrow{color:#72d7cc}.lecture-header h1{max-width:900px;margin-bottom:15px;font-size:clamp(2.3rem,5vw,4.7rem)}.hero-copy{max-width:830px;margin:0;color:#d7e6ef;font-size:clamp(1rem,1.8vw,1.25rem)}.lecture-nav{margin-top:34px;display:flex;flex-wrap:wrap;gap:8px!important}.lecture-header .lecture-nav a{padding:7px 11px;color:#e9f1f5;background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.18);border-radius:4px}.lecture-main{padding-top:10px;padding-bottom:70px}.section-block{padding:50px 0;border-bottom:1px solid var(--line)}.section-label{margin:0 0 7px;color:var(--teal);font-size:.76rem;font-weight:850;letter-spacing:.09em;text-transform:uppercase}.section-intro{max-width:720px;color:var(--muted)}.check-list{padding:0;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px 28px;list-style:none}.check-list li{position:relative;padding-left:27px}.check-list li::before{position:absolute;left:0;content:"✓";color:var(--teal);font-weight:900}.concept-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:15px}.concept-card,.activity-card{padding:22px;background:var(--surface);border:1px solid var(--line);border-radius:6px}.concept-card h3,.activity-card h3{margin-bottom:8px}.concept-card>p,.activity-card>p{color:var(--muted)}.concept-example{margin-top:17px;padding-top:14px;border-top:1px solid var(--line);font-size:.9rem}.activity-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:15px}.activity-card{position:relative;padding-top:55px}.activity-number{position:absolute;top:18px;left:22px;color:var(--teal);font-size:.78rem;font-weight:900}.deliverable{padding-top:12px;border-top:1px solid var(--line);font-size:.9rem}.practice-panel{padding:25px}.panel-heading{display:flex;align-items:start;justify-content:space-between;gap:14px;margin-bottom:20px}.panel-heading h3{margin:7px 0 0}.badge,.score-pill{display:inline-block;padding:4px 8px;color:#075d56;background:#daf1ed;border-radius:3px;font-size:.72rem;font-weight:850;letter-spacing:.04em;text-transform:uppercase}.badge-alt{color:#6c4a0e;background:#f8ebcd}.score-pill{color:var(--navy);background:#eaf1f6;white-space:nowrap}.question-text{min-height:72px;margin:0;font-weight:700}.answer-list{display:grid;gap:8px}.answer-button{padding:11px 12px;text-align:left;color:var(--ink);background:#f8fafb;border:1px solid #cbd5df;border-radius:4px;cursor:pointer}.answer-button:hover:not(:disabled){border-color:var(--navy)}.answer-button.correct{color:#075d48;background:#e5f5ef;border-color:#7abda6}.answer-button.incorrect{color:#8a2530;background:#fbeaec;border-color:#dfafb4}.feedback{margin-top:15px;padding:14px;border-left:3px solid var(--amber);background:#faf6ec}.feedback-correct{border-color:var(--teal);background:#edf8f4}.feedback .next-button{width:100%;margin-top:12px;color:#fff;background:var(--navy)}.result-card{text-align:center;padding:28px 10px}.result-score{color:var(--teal);font-size:3rem;font-weight:900}.problem-section{border-bottom:0}.problem-controls,.lab-controls{display:grid;grid-template-columns:auto minmax(180px,1fr) auto;gap:10px;align-items:center;margin:24px 0 15px}.problem-controls label,.lab-controls label{color:var(--muted);font-size:.84rem;font-weight:700}.problem-controls input,.lab-controls input,.lab-controls select{min-height:42px;padding:8px 10px;background:#fff;border:1px solid #b8c6d3;border-radius:4px}.problem-controls .button,.lab-controls .button{color:#fff;background:var(--navy)}.problem-card{padding:28px;background:var(--surface);border:1px solid var(--line);border-top:4px solid var(--teal);border-radius:6px}.problem-card h3{font-size:1.35rem}.scenario{color:var(--muted);font-size:1.04rem}.problem-prompt{margin:20px 0;padding:18px;background:#eef4f7;border-radius:4px}.problem-prompt p{margin:5px 0 0}.worked-solution{margin-top:22px;padding-top:18px;border-top:2px solid var(--teal)}.worked-solution li{margin-bottom:8px}.takeaway-block{padding:42px;background:#eef4f7;border:0;border-radius:7px}.takeaway-list li{margin-bottom:10px}.lecture-pagination{padding-top:30px;display:flex;justify-content:space-between}.lecture-pagination a{color:var(--navy);font-weight:800;text-decoration:none}.lecture-main+footer .container,body>footer .container{width:min(1160px,90vw);display:flex;justify-content:space-between;gap:20px}.practice-header .container{padding-bottom:55px}.lab-controls{grid-template-columns:auto minmax(220px,1fr) auto minmax(180px,1fr) auto}.compact-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.mini-card{min-height:170px;padding:22px}.mini-card h3{margin:8px 0}.card-link{margin-top:auto;color:var(--navy);font-weight:750}
@media(max-width:880px){.concept-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.activity-grid,.compact-grid{grid-template-columns:1fr 1fr}.lab-controls{grid-template-columns:1fr 1fr}.problem-controls{grid-template-columns:1fr}.topbar{padding-bottom:34px}.check-list{grid-template-columns:1fr}}
@media(max-width:560px){.concept-grid,.activity-grid,.compact-grid{grid-template-columns:1fr}.lecture-header .container{padding-bottom:36px}.topbar{display:flex}.top-links{display:flex}.lecture-nav{display:none!important}.problem-card,.practice-panel{padding:20px}.lab-controls{grid-template-columns:1fr}.takeaway-block{padding:25px}.lecture-main+footer .container,body>footer .container{display:block}}