
:root{--ink:#18324e;--blue:#28619a;--orange:#ad7c16;--muted:#6b7888;--line:#dce3eb;--paper:#f4f6f9;--green:#23785c}*{box-sizing:border-box}body{margin:0;font:15px/1.6 'Segoe UI',Arial,sans-serif;color:var(--ink);background:var(--paper)}button,input,select,textarea{font:inherit}button,a,input,select,textarea{outline-offset:4px}button{cursor:pointer;border:0}button:focus-visible,a:focus-visible{outline:3px solid var(--orange)}header{background:#fff;border-bottom:1px solid var(--line);padding:18px 5%;display:flex;align-items:center;justify-content:space-between;gap:20px}.brand{font-size:24px;font-weight:800;color:var(--ink);text-decoration:none;letter-spacing:-1px}.brand span{color:var(--orange)}.small{font-size:12px;color:var(--muted)}nav{display:flex;gap:8px;flex-wrap:wrap}nav button{background:transparent;padding:10px 15px;border-radius:7px;color:var(--muted);font-size:13px;font-weight:600}nav button.active{background:#eaf1fa;color:var(--blue)}main{max-width:1280px;margin:auto;padding:38px 4% 60px}.kicker{font-size:11px;text-transform:uppercase;letter-spacing:2px;font-weight:700;color:var(--orange)}h1{font-size:43px;line-height:1.15;letter-spacing:-1.5px;margin:12px 0 16px}h2{font-size:22px;line-height:1.3;margin:0 0 15px}h3{font-size:17px;margin:0 0 8px}p{margin:8px 0 18px}.muted{color:var(--muted)}.hero{display:flex;justify-content:space-between;align-items:center;gap:30px;margin-bottom:30px}.hero p{max-width:680px;color:var(--muted)}.chapter{font-size:75px;font-weight:800;color:#dbe3ed;line-height:1}.chapter small{display:block;font-size:10px;letter-spacing:2px;color:var(--muted);text-align:center}.grid{display:grid;grid-template-columns:1.05fr .95fr;gap:22px}.card{background:white;border:1px solid var(--line);padding:26px;border-radius:12px;margin-bottom:22px}.card-head{display:flex;align-items:center;justify-content:space-between;gap:15px;margin-bottom:20px}.card-head h2{margin:0}.btn{padding:11px 17px;border-radius:7px;background:var(--blue);color:white;font-size:13px;font-weight:600;display:inline-block;text-decoration:none}.btn:hover{filter:brightness(.94)}.outline{background:white;color:var(--ink);border:1px solid var(--line)}.orange{background:var(--orange)}.actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:20px}.fields{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:17px}#blockFields{grid-template-columns:repeat(4,minmax(0,1fr))!important}label{font-size:12px;font-weight:600;color:#5a6b80;display:block}input,select,textarea{display:block;width:100%;padding:11px 12px;border:1px solid var(--line);border-radius:6px;background:#fbfcfe;color:var(--ink);margin-top:7px}textarea{resize:vertical}.wide{grid-column:1/-1}.help{font-size:11px;font-weight:400;color:var(--muted);display:block;margin-top:6px}.metric{border-bottom:1px solid var(--line);padding:15px 0}.metric span{font-size:12px;color:var(--muted)}.metric strong{display:block;font-size:34px;line-height:1.3;color:var(--blue);font-weight:700}.metric em{font-size:14px;font-style:normal;color:var(--muted)}.result-cols{display:grid;grid-template-columns:1fr 1fr;gap:15px}.formula{font-family:'Segoe UI',Arial;font-size:16px;background:#eef3fa;border-radius:6px;padding:15px;margin:20px 0}.warning,.success,.error{padding:13px 15px;font-size:12px;border-radius:7px;margin:12px 0}.warning{background:#fff1e5;color:#925120}.success{background:#e8f5ee;color:#246a4c}.error{background:#ffecec;color:#a03636}.stage{background:#fff;border:1px solid var(--line);border-radius:13px;padding:45px 55px;min-height:480px;position:relative;display:flex;flex-direction:column;justify-content:center}.slide-title{font-size:36px;line-height:1.25;font-weight:700;letter-spacing:-1px;margin:0 0 28px;max-width:1000px}.slide-content{font-size:22px;line-height:1.6}.slide-content p{margin:0 0 20px}.slide-content table{font-size:18px}.slide-content .formula{font-size:26px}.slide-note{font-size:14px;color:var(--muted);margin-top:22px}.present-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:17px;gap:12px}.slide-controls{display:flex;align-items:center;justify-content:space-between;margin-top:16px;gap:16px}.slide-controls select{max-width:420px;margin:0}.progress{height:4px;background:#dbe3ed;margin:14px 0 28px;border-radius:5px}.progress div{height:100%;background:var(--orange);transition:width .2s}.stage svg{max-height:230px;width:100%;margin:12px 0;overflow:visible}table{border-collapse:collapse;width:100%;font-size:13px}td,th{border-bottom:1px solid var(--line);padding:12px;text-align:left}th{background:#edf3fb;color:var(--blue)}.diagram{overflow:auto}.diagram svg{min-width:640px;width:100%;height:230px}.sim{display:flex;align-items:center;gap:35px;justify-content:center;padding:15px 0}.sim svg{width:230px;height:230px;flex-shrink:0}.pill{font-size:11px;background:#edf3fb;padding:5px 10px;border-radius:4px;color:var(--blue)}.fullwidth{grid-column:1/-1}.tabs-row{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:22px}.tabs-row button{padding:10px 16px;border-radius:7px;background:#fff;color:var(--muted);border:1px solid var(--line)}.tabs-row button.on{color:white;background:var(--blue)}footer{font-size:12px;color:var(--muted);padding:25px 5%;border-top:1px solid var(--line);display:flex;justify-content:space-between}.archive-item{background:white;padding:22px;border-radius:9px;border:1px solid var(--line);margin:12px 0;display:flex;justify-content:space-between;align-items:center;gap:15px}#toast{position:fixed;bottom:24px;right:24px;background:var(--ink);color:white;border-radius:9px;padding:13px 22px;z-index:100;max-width:90%;display:none}.file{cursor:pointer}.link{color:var(--blue)}[hidden]{display:none!important}.presentation-mode header,.presentation-mode .hero,.presentation-mode footer{display:none}.presentation-mode main{max-width:100%;padding:15px 3%}.presentation-mode .stage{min-height:calc(100vh - 160px)}@media(max-width:800px){#blockFields{grid-template-columns:repeat(2,minmax(0,1fr))!important}header{display:block;padding:15px 5%}header nav{margin-top:14px;flex-wrap:nowrap;overflow:auto}nav button{white-space:nowrap;font-size:12px;padding:9px 12px}.grid{grid-template-columns:1fr}.hero h1{font-size:34px}.chapter{display:none}.card{padding:22px}.stage{padding:28px 24px;min-height:460px}.slide-title{font-size:27px}.slide-content{font-size:18px}.slide-content table{font-size:13px}.slide-controls{flex-wrap:wrap}.slide-controls select{width:100%;max-width:100%;order:3}.slide-content .formula{font-size:21px}.sim{gap:12px}.sim svg{width:170px;height:170px}.archive-item{display:block}.card-head{align-items:flex-start}footer{display:block}.diagram{font-size:12px}}@media print{header,footer,.actions,.hero,.tabs-row,.present-head,.slide-controls,.progress,#toast{display:none!important}main{padding:0}.card,.stage{break-inside:avoid;box-shadow:none;border:0}.grid{display:block}body{background:white}.stage{min-height:0}input,select,textarea{border:0;background:white}button{display:none!important}}

body{font-size:15px}.brand{letter-spacing:-.8px}.hero{margin:5px 0 36px}.hero h1{font-size:47px}.scene-wrap{background:#fbfcf8;border:1px solid var(--line);border-radius:12px;overflow:hidden}.scene-wrap svg{display:block;width:100%;height:auto;max-height:440px}.scene-metrics{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:15px;margin:22px 0}.scene-metrics>div{padding:12px 18px;border-left:3px solid #d1dfd3}.scene-metrics b{display:block;font-size:26px}.scene-metrics small{color:var(--muted)}input[type=range]{padding:0;accent-color:var(--blue)}.control-row{display:grid;grid-template-columns:1fr 2fr;align-items:end;gap:24px;margin-top:22px}.calc-grid{display:grid;grid-template-columns:1fr 1fr;gap:22px}.mini-nav{display:flex;gap:8px;flex-wrap:wrap}.hint{padding:15px 18px;background:#edf4e7;border-left:3px solid #9ab781;margin:20px 0;font-size:13px}.stage .diagram svg{height:200px}.stats{display:flex;gap:25px}.stats b{font-size:25px}.stats span{display:block;font-size:11px;color:var(--muted)}.flow{display:flex;gap:12px;align-items:center;flex-wrap:wrap}.flow>span{background:#edf3fb;padding:12px 18px;border-radius:5px}.stage{min-height:440px}.task-row{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:15px}.badge{font-size:11px;color:#237564;background:#edf3fb;border-radius:4px;padding:5px 9px}.table-wrap{overflow-x:auto}.schematic-box{overflow-x:auto}.schematic-box svg{min-width:660px;width:100%;height:190px}.banner{display:grid;grid-template-columns:1fr auto;gap:20px;border-top:1px solid var(--line);padding-top:18px;margin-top:24px}.scene-legend{font-size:12px;color:var(--muted)}@media(max-width:800px){.hero h1{font-size:34px}.calc-grid{grid-template-columns:1fr}.control-row{grid-template-columns:1fr}.scene-metrics{gap:5px}.scene-metrics>div{padding:8px}.scene-metrics b{font-size:19px}.task-row{grid-template-columns:1fr}.stats{display:none}.fields{grid-template-columns:minmax(0,1fr) minmax(0,1fr)}.block-selectors{grid-template-columns:repeat(2,minmax(0,1fr))!important}.stage{min-height:450px}.banner{grid-template-columns:1fr}}@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}

.hero h1{font-size:44px}.hero-code{font:17px/1.8 Consolas,monospace;color:#245c8c;white-space:pre;background:#e9f0f7;border-radius:12px;padding:25px 35px}.hero-code b{color:#8b6515}.task-list{display:grid;grid-template-columns:1fr 1fr;gap:22px}.task-card{background:white;border:1px solid var(--line);border-radius:12px;overflow:hidden;align-self:start}.task-top{display:flex;align-items:center;justify-content:space-between;padding:20px 23px 0;gap:10px}.task-top b{font-size:16px}.task-body{padding:14px 23px 23px}.task-body p{font-size:13px;color:#5e6e80}.task-number{color:#8e9fb1;font-size:12px;font-weight:700}.task-card pre,.console-code{background:#152d46;color:#dbe7f0;border-radius:8px;padding:18px 20px;font:14px/1.8 Consolas,'Courier New',monospace;white-space:pre-wrap;overflow:auto;tab-size:4}.task-card textarea{font-family:Consolas,'Courier New',monospace;line-height:1.8;min-height:105px;font-size:14px}.task-card .actions{gap:8px;margin:14px 0 0}.task-card .btn{font-size:11px;padding:9px 12px}.task-card details{font-size:12px;color:var(--muted);margin-top:14px}.task-card summary{cursor:pointer;color:var(--blue)}.solution{margin-top:16px;border-top:1px solid var(--line);padding-top:15px}.status{font-size:11px;font-weight:700;padding:4px 9px;border-radius:4px;color:#6b7888;background:#f1f3f6}.status.ok{background:#e4f4ea;color:#286044}.status.bad{background:#fff0e5;color:#945324}.score-bar{display:flex;justify-content:space-between;align-items:center;gap:20px;background:#18324e;color:white;padding:23px 28px;border-radius:11px;margin:0 0 25px}.score-bar strong{font-size:32px}.score-bar small{color:#c0d0e1}.toolbar{display:flex;align-items:center;gap:10px;flex-wrap:wrap}.top-note{margin:0 0 18px;color:var(--muted);font-size:12px}.summary-strip{display:flex;gap:20px;flex-wrap:wrap;margin-top:18px}.summary-strip b{font-size:19px;color:var(--blue)}.summary-strip span{font-size:12px;color:var(--muted)}#codeInput{min-height:280px;font:15px/1.8 Consolas,monospace;background:#152d46;color:#f2f5f9;tab-size:4}.terminal{background:#152d46;color:#dbe7f0;padding:20px;min-height:110px;border-radius:8px;white-space:pre-wrap;font:15px/1.8 Consolas,monospace}.step-code{font:14px/1.9 Consolas,monospace;background:#f2f5fa;padding:15px;border-radius:6px;white-space:pre-wrap}.step-code .current{display:block;background:#f5df9b;color:#18324e}.step-table td{font-family:Consolas,monospace}.report-buttons{position:sticky;bottom:0;background:#f4f6f9f5;padding:15px 0;z-index:3}.empty{padding:35px;color:var(--muted);text-align:center;border:1px dashed #cbd7e4;border-radius:10px}.topic-label{font-size:10px;text-transform:uppercase;letter-spacing:1px;color:var(--blue)}.task-card.correct{border-color:#96c2a4}.task-card.incorrect{border-color:#dcac8d}#roster{min-height:200px}.code-help{font-size:12px;border-left:3px solid #d9bd62;padding:12px 15px;background:#fbf6e8}.fields input,.fields select{min-width:0}.stats strong{font-size:26px}.page-title{font-size:30px;margin-bottom:20px}.screen-reader{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%)}@media(max-width:850px){.task-list{grid-template-columns:1fr}.hero-code{display:none}.score-bar{padding:18px}.score-bar strong{font-size:26px}.task-top{padding:18px 18px 0}.task-body{padding:13px 18px 20px}.hero h1{font-size:33px}.report-buttons{position:static}.fields{gap:12px}}@media print{.report-buttons,.hero-code{display:none!important}.task-card{break-inside:avoid;border:1px solid #ccc}.task-list{display:block}.task-card{margin-bottom:18px}}
@media(max-width:850px){#setupFields{grid-template-columns:repeat(2,minmax(0,1fr))!important}}
