@import url('fonts.css');
:root{--blue:#3459e8;--ink:#20283d;--muted:#626e85;--bg:#f5f7fb;--line:#dde4f0;--violet:#7551ac;--green:#087766;--orange:#b45816;font-family:Inter,ui-sans-serif,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:var(--ink);background:var(--bg);font-synthesis:none}*{box-sizing:border-box}body{margin:0}button,input,select,textarea{font:inherit}button,a,input,select,summary{touch-action:manipulation}button{cursor:pointer;border:1px solid transparent;border-radius:12px;padding:12px 18px;background:var(--blue);color:white;font-weight:650;min-height:44px}button:hover{filter:brightness(.95)}button:disabled{opacity:.55;cursor:default}a{color:var(--blue);text-decoration:none}a:hover{text-decoration:underline}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,summary:focus-visible{outline:3px solid #eea32f;outline-offset:3px}p,li{line-height:1.65}h1,h2,h3{letter-spacing:-.035em;line-height:1.15}h1{font-size:clamp(2rem,4vw,3.6rem);max-width:900px;margin:.4em 0}h2{font-size:clamp(1.5rem,2.5vw,2rem)}h3{font-size:1.2rem}small,.muted{color:var(--muted)}.header{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:20px max(24px,calc((100vw - 1240px)/2));background:white;border-bottom:1px solid var(--line)}.brand{display:flex;gap:12px;align-items:center;font-weight:800;font-size:19px;color:var(--ink);white-space:nowrap}.brand small{display:block;font-weight:450;font-size:11px;letter-spacing:.03em;margin-top:4px}.brand-icon{display:grid;place-items:center;background:var(--blue);color:white;width:44px;height:44px;border-radius:14px;font-size:25px}.header nav{display:flex;gap:22px;font-size:14px;font-weight:650}.header nav a{color:var(--muted)}main{max-width:1240px;padding:32px 24px 70px;margin:auto;min-height:75vh}.hero{padding:34px 0 22px}.eyebrow{text-transform:uppercase;letter-spacing:.13em;font-weight:750;font-size:11px;color:var(--blue)}.hero p{max-width:730px;font-size:17px;color:var(--muted)}.dedication{display:inline-block;color:var(--violet);background:#eee7fb;border-radius:100px;padding:9px 15px;font-size:13px;font-weight:600}.hero-top{display:grid;grid-template-columns:1fr 260px;align-items:center;gap:40px}.hero-art{width:100%;height:auto}.stats{display:flex;gap:30px;flex-wrap:wrap;margin:24px 0}.stats b{display:block;font-size:26px;letter-spacing:-.04em}.stats span{font-size:12px;color:var(--muted)}.section-head{display:flex;align-items:end;justify-content:space-between;gap:16px;margin:35px 0 18px}.section-head h2{margin:0}.toolbar{display:flex;gap:12px;flex-wrap:wrap;margin:22px 0}.toolbar input{flex:1;min-width:180px}.filters{display:flex;gap:7px;flex-wrap:wrap}.filters button,.secondary{background:white;color:var(--ink);border:1px solid var(--line)}.filters button[aria-pressed=true]{background:var(--blue);color:white;border-color:var(--blue)}input[type=search],input[type=text],input[type=number],select,textarea{padding:11px 12px;border:1px solid #c9d2e3;border-radius:10px;background:white;color:var(--ink);max-width:100%;min-height:44px}textarea{width:100%;min-height:90px;resize:vertical}.cards{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}.card,.panel{background:white;border:1px solid var(--line);border-radius:20px;padding:24px}.card{display:flex;flex-direction:column;position:relative;transition:transform .18s,border-color .18s}.card:hover{transform:translateY(-3px);border-color:#aabaf4}.card h3{margin:18px 0 8px}.card p{font-size:14px;color:var(--muted);margin:0 0 20px}.card-bottom{margin-top:auto;display:flex;justify-content:space-between;align-items:center;gap:10px}.tag{font-size:11px;font-weight:750;letter-spacing:.06em;text-transform:uppercase}.tag.chem{color:var(--violet)}.tag.phys{color:var(--blue)}.card-num{font-size:12px;color:#8a95ac;margin-left:auto}.card-top{display:flex;align-items:center;gap:10px}.mini-icon{width:39px;height:39px;border-radius:12px;display:grid;place-items:center;background:#edf1ff;color:var(--blue);font-size:22px}.chem .mini-icon{background:#f2eafb;color:var(--violet)}.progress-track{height:5px;background:#edf0f7;border-radius:20px;overflow:hidden;margin:20px 0 8px}.progress-track span{display:block;height:100%;background:var(--green)}.progress-caption{font-size:11px;color:var(--muted)}.banner{background:#eaf0ff;border:1px solid #d8e1ff;border-radius:18px;padding:20px 24px;display:flex;align-items:center;justify-content:space-between;gap:20px}.banner p{margin:4px 0;font-size:14px}.banner h3{margin:0}.link{background:none;color:var(--blue);border:0;padding:8px 0;font-weight:650}.breadcrumb{font-size:13px;margin-bottom:20px}.module-meta{display:flex;gap:8px;flex-wrap:wrap}.pill{background:white;border:1px solid var(--line);border-radius:50px;font-size:12px;padding:7px 12px}.module-nav{position:sticky;top:0;z-index:5;display:flex;gap:5px;overflow-x:auto;background:rgba(245,247,251,.97);padding:12px 0;border-bottom:1px solid var(--line);margin:18px 0 24px;scrollbar-width:thin}.module-nav a{white-space:nowrap;padding:11px 14px;background:white;border:1px solid var(--line);border-radius:11px;color:var(--ink);font-size:14px;font-weight:650}.module-nav a:hover{background:#eaf0ff}.section{scroll-margin-top:85px;margin:42px 0}.section-intro{color:var(--muted);margin-top:-7px}.sim-layout{display:grid;grid-template-columns:minmax(0,1fr) 290px;gap:22px}.stage{border:1px solid var(--line);border-radius:16px;overflow:hidden;background:linear-gradient(150deg,#fff,#f4f7fe)}.simulation-svg{width:100%;height:auto;display:block;min-height:210px}.sim-controls{display:flex;flex-direction:column;gap:16px}.control label{display:block;font-size:12px;font-weight:650;margin-bottom:7px}.control .control-row{display:flex;gap:10px;align-items:center}.control input[type=range]{width:100%;accent-color:var(--blue);min-height:32px;min-width:0}.control input[type=number]{width:88px;flex-shrink:0;padding:8px;font-size:13px}.control select{width:100%;font-size:13px}.results{display:grid;grid-template-columns:repeat(auto-fit,minmax(130px,1fr));gap:12px;margin-top:18px}.result{padding:14px;background:#f0f4ff;border-radius:12px}.result span{display:block;font-size:11px;color:var(--muted);margin-bottom:7px}.result strong{font-size:17px;overflow-wrap:anywhere}.formula{background:#edf2ff;color:#2447bb;border-radius:12px;padding:16px 20px;font-weight:650;line-height:1.7;overflow-wrap:anywhere}.sim-note{font-size:12px;color:var(--muted);line-height:1.6}.course{background:#f4effb;border-color:#e2d6f1}.course>summary{color:#68459d}.course details{background:#fff;border:1px solid #e5dcf0}.course-content{padding:8px 0}.course-content table{width:100%;border-collapse:collapse;font-size:14px}.course-content td,.course-content th{padding:8px;border:1px solid var(--line)}details{border:1px solid var(--line);border-radius:14px;padding:0 18px;background:white;margin:12px 0}summary{cursor:pointer;padding:18px 0;font-weight:700;line-height:1.5;min-height:50px}details>div{padding:0 0 18px}details p:first-child{margin-top:0}.formula-list{display:grid;gap:8px}.formula-list p{margin:0;padding:12px 16px;background:#eee7f8;border-radius:10px}.pitfalls{border-left:3px solid #dd9449;padding:2px 18px;background:#fff7ec;margin:18px 0}.activity{background:white;border:1px solid var(--line);border-radius:18px;padding:24px;margin:16px 0}.activity h3{margin-top:0}.exercise-tabs{display:flex;flex-wrap:wrap;gap:7px;margin:12px 0}.exercise-tabs button{padding:9px 13px;min-width:44px;background:white;color:var(--muted);border-color:var(--line)}.exercise-tabs button.active{background:var(--blue);color:white}.answer-row{display:flex;align-items:center;flex-wrap:wrap;gap:10px;margin:20px 0}.answer-row input{width:180px}.feedback{padding:16px;border-radius:12px;background:#edf2ff;line-height:1.65;margin:14px 0}.feedback.good{background:#e8f5ef;color:#13624e}.feedback.wrong{background:#fff0e3;color:#894811}.hint{padding:10px 16px;border-left:3px solid var(--violet);color:#674b8c;margin:12px 0}.quiz-options{display:grid;gap:10px;margin:20px 0}.quiz-options button{text-align:left;background:white;color:var(--ink);border:1px solid var(--line);font-weight:500;line-height:1.5}.quiz-options button.correct{border-color:var(--green);background:#e8f5ef;opacity:1}.quiz-options button.incorrect{border-color:#c48143;background:#fff0e3;opacity:1}.quiz-options button:disabled{opacity:.8}.actions{display:flex;gap:10px;align-items:center;flex-wrap:wrap}.quiz-status{font-size:13px;color:var(--muted)}.exam-part{border-top:1px solid var(--line);padding:20px 0}.exam-part label{font-weight:650;display:block;margin:12px 0}.exam-context{background:#f0f4fc;padding:18px;border-radius:12px;line-height:1.65}.empty{text-align:center;padding:40px;color:var(--muted)}.revision-options{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.revision-options button{padding:24px;text-align:left;background:white;color:var(--ink);border-color:var(--line)}.revision-options b{font-size:25px;display:block;margin-bottom:10px}.revision-options small{display:block;line-height:1.6}.error-item{display:flex;justify-content:space-between;gap:20px;align-items:center;padding:16px 0;border-top:1px solid var(--line)}.error-item p{margin:0}.footer-links{display:flex;gap:15px;flex-wrap:wrap}footer{padding:30px 24px;text-align:center;border-top:1px solid var(--line);font-size:12px;color:var(--muted)}footer span{display:block;margin:10px}dialog{max-width:550px;width:calc(100% - 32px);border:1px solid var(--line);border-radius:20px;padding:26px;box-shadow:0 25px 100px #18244433}dialog::backdrop{background:#20283d66}.file-label{display:block;margin:18px 0;font-weight:650}.file-label input{display:block;margin-top:12px;max-width:100%}.danger{background:#a23f32}.skip{position:fixed;top:-100px;z-index:20;background:white;padding:16px}.skip:focus{top:0}pre{overflow:auto;font-size:13px;background:#f5f7fb;padding:16px;border-radius:10px}code{font-family:ui-monospace,monospace}.hidden{display:none!important}.print-only{display:none}@media(max-width:1000px){.cards{grid-template-columns:repeat(2,minmax(0,1fr))}.sim-layout{grid-template-columns:minmax(0,1fr) 250px}.header{padding:18px 24px}.header nav{gap:12px}.hero-top{grid-template-columns:1fr 190px}}@media(max-width:700px){.header{display:block;padding:16px 20px}.header nav{margin-top:18px;justify-content:space-between;gap:8px;font-size:12px}.brand{font-size:17px}main{padding:22px 16px 45px}.hero{padding:10px 0}.hero-top{grid-template-columns:1fr}.hero-art{display:none}.hero p{font-size:15px}.cards{grid-template-columns:1fr}.card,.panel,.activity{padding:19px}.card h3{font-size:21px}.sim-layout{grid-template-columns:1fr}.sim-controls{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px 12px}.control .control-row{display:block}.control input[type=number]{width:100%}.control select{font-size:12px}.results{grid-template-columns:repeat(2,minmax(0,1fr))}.result strong{font-size:15px}.module-nav{margin-left:-16px;margin-right:-16px;padding:10px 16px}.module-nav a{padding:10px 12px;font-size:12px}.banner{display:block;padding:18px}.banner .actions{margin-top:14px}.section-head{align-items:start}.section-head p{font-size:12px}.stats{gap:23px}.stats b{font-size:24px}.revision-options{grid-template-columns:1fr}.revision-options button{padding:19px}.revision-options b{font-size:21px}.error-item{display:block}.dedication{font-size:11px}.formula{font-size:14px;padding:14px}.course-content{font-size:14px}.simulation-svg{min-height:180px}.simulation-svg text{font-size:18px}.section{margin:30px 0}.answer-row input{width:140px}.exam-context{font-size:14px}}@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}@media print{body{background:white;color:black;font-size:11pt}.header,.module-nav,footer,.sim-controls,.toolbar,.actions,button,.no-print,#exercises,#quiz,#exam,.hero-art,.breadcrumb{display:none!important}main{padding:0;max-width:none}.hero h1{font-size:24pt}.section{margin:15px 0}.panel,details{border-color:#bbb;break-inside:avoid}.course{background:white}details:not([open])>*:not(summary){display:block!important}details details>div{display:block!important}.print-only{display:block}.sim-layout{display:block}.simulation-svg{max-height:250px}.results{grid-template-columns:repeat(4,1fr)}.hero p{font-size:11pt}.formula-list{display:block}.formula-list p{margin:6px 0}.course-content p{line-height:1.4}}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.button-link{display:inline-block;background:var(--blue);padding:12px 18px;border-radius:11px;color:white;font-weight:650;white-space:nowrap}.card a{font-size:13px;font-weight:650}.section-head>span{font-size:12px}
main:focus{outline:none}@media(max-width:700px){.section-head{flex-wrap:wrap}.module-meta{display:none}.header{border-bottom:1px solid var(--line)}.module-nav{position:sticky;top:0}.hero h1{font-size:2.2rem}.module-nav a:focus-visible{outline-offset:-3px}}

:root{font-family:'DM Sans',sans-serif}h1,h2,h3,.brand{font-family:Manrope,sans-serif}
#revision-scope{display:block;width:100%;margin:12px 0}.revision-options{margin-top:16px}.protocol{padding:0;list-style:none;counter-reset:protocol}.protocol li{display:flex;align-items:center;justify-content:space-between;gap:12px;border-bottom:1px solid var(--line);padding:12px 0;counter-increment:protocol}.protocol li>span:before{content:counter(protocol) '. ';color:var(--violet);font-weight:700}.protocol button{padding:8px 12px}@media(max-width:700px){.protocol li{font-size:13px}.protocol .actions{flex-wrap:nowrap}}
@media(max-width:700px){.simulation-svg text{font-size:23px}.simulation-svg{min-height:180px}.sim-note{font-size:12px}.hero p{line-height:1.6}}