@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;500;600;700&family=Manrope:wght@400;500;600;700;800&display=swap');
:root{--ink:#162f40;--muted:#62747e;--line:#d8e1e3;--paper:#f5f7f4;--white:#fff;--input:#b26708;--ground:#258e8a;--sw:#d15f47;--output:#4f7c28;--sense:#8262bb;--pink:#c63077;--background:#f8faf7;--foreground:#173547;--muted-foreground:#69818d;--viz-series-1:var(--input);--viz-series-2:var(--ground);--viz-series-3:var(--sw);--viz-series-4:var(--output);--viz-series-5:var(--sense)}
*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font-family:'DM Sans',system-ui,sans-serif;font-size:14px;line-height:1.5}a{color:inherit;text-underline-offset:3px}button,input{font:inherit}button{cursor:pointer;color:inherit;border:1px solid var(--line);border-radius:6px;background:white;padding:8px 12px;transition:background .15s,color .15s}button:hover{background:#e8f1ed}button:focus-visible,a:focus-visible,summary:focus-visible{outline:3px solid #c47c21;outline-offset:3px}button[aria-pressed=true]{background:var(--ink);border-color:var(--ink);color:white}button:disabled{cursor:default;opacity:.35}h1,h2,h3{font-family:Manrope,system-ui,sans-serif;line-height:1.2;margin:0}h1{font-size:clamp(32px,4vw,54px);letter-spacing:-2px;font-weight:800}h1 span{color:#62847b}h2{font-size:24px;letter-spacing:-.7px}h3{font-size:16px}p{margin:10px 0}small{display:block}header{height:82px;padding:0 4%;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;background:white}.brand{display:flex;gap:12px;align-items:center;text-decoration:none;font-size:16px;font-weight:700}.brand small{font-size:11px;color:var(--muted);font-weight:500;letter-spacing:.4px}.brand-mark{background:var(--ink);color:white;border-radius:9px;padding:7px 9px;font-size:19px}.header-links{display:flex;gap:25px;align-items:center;font-size:12px}.revision{border:1px solid var(--line);padding:5px 10px;border-radius:20px;letter-spacing:.5px;font-size:10px}.intro{display:flex;justify-content:space-between;gap:40px;align-items:center;padding:38px 0 32px}.eyebrow{font-size:10px;letter-spacing:1.6px;font-weight:700;color:var(--muted);margin:0 0 10px}.intro-note{max-width:375px;font-size:15px}.status{font-size:12px;color:var(--muted)}.status i{display:inline-block;width:7px;height:7px;background:#c58b35;border-radius:50%;margin-right:6px}main{max-width:1600px;margin:auto;padding:0 4%}.lessons{display:grid;grid-template-columns:repeat(5,1fr);border:1px solid var(--line);border-radius:10px;overflow:hidden;background:#fff;margin-bottom:20px}.lessons button{border:0;border-right:1px solid var(--line);border-radius:0;text-align:left;padding:16px;display:flex;gap:10px;align-items:center}.lessons button:last-child{border:0}.lessons b{font-size:12px;opacity:.6}.lessons span{font-weight:600;font-size:13px}.lessons button[aria-current=step]{background:var(--ink);color:white}.workspace{display:grid;grid-template-columns:minmax(0,1.55fr) minmax(340px,1fr);gap:22px;align-items:start;scroll-margin-top:16px}.board-panel{background:#fff;border:1px solid var(--line);border-radius:12px;overflow:hidden}.panel-head{display:flex;align-items:center;justify-content:space-between;padding:19px 22px 14px}.panel-head h2{font-size:20px}.panel-head .eyebrow{font-size:9px;margin-bottom:5px}.panel-head button{font-size:12px}.map-tools{display:flex;justify-content:space-between;gap:8px;padding:0 18px 14px;flex-wrap:wrap}.layer-tabs,.zoom{display:flex;gap:4px}.map-tools button{padding:6px 8px;font-size:11px}.canvas-wrap{background:var(--background);position:relative;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}#copper{display:block;width:100%;height:570px;touch-action:none;cursor:grab}#copper:active{cursor:grabbing}#copper text{font-family:'DM Sans',sans-serif;font-size:12px;fill:var(--ink)}#copper .component-hit{cursor:pointer}#copper .component-hit:hover text{fill:var(--pink)}.map-help{position:absolute;bottom:5px;left:12px;font-size:10px;color:var(--muted);pointer-events:none}#loading{position:absolute;left:20px;top:25px}#loading[hidden]{display:none}.legend{display:flex;gap:13px;flex-wrap:wrap;padding:14px 20px 0;font-size:11px}.legend i{display:inline-block;width:12px;height:7px;margin-right:4px;border-radius:2px}.input{background:var(--input)}.ground{background:var(--ground)}.sw{background:var(--sw)}.output{background:var(--output)}.sense{background:var(--sense)}.layer-note{padding:0 20px;color:var(--muted);font-size:11px}.part-inspector{border-top:1px solid var(--line);padding:15px 20px;background:#fdfefb}.part-pills{display:flex;gap:5px;flex-wrap:wrap}.part-pills button{padding:3px 8px;font-size:11px}.part-inspector #part-detail{font-size:12px;color:var(--muted);margin-top:9px;min-height:40px}.part-inspector strong{color:var(--ink)}.bypass-toggle{padding:5px 20px 16px;font-size:12px;color:var(--pink)}.bypass-toggle small{font-size:11px;margin-top:4px;color:var(--muted)}.bypass-toggle[hidden]{display:none}.lesson-panel{padding:5px 0}.lesson-heading h2{font-size:28px;margin-bottom:12px}.lesson-heading>p:last-child{font-size:14px;color:var(--muted)}.mode-tabs{display:flex;margin:21px 0 15px;gap:6px}.mode-tabs button{font-size:12px;padding:7px 14px}#explanation{min-height:190px}#explanation h3{margin-bottom:8px}#explanation p{font-size:13px;line-height:1.65}#explanation .finding{border-left:3px solid var(--ground);padding-left:13px}#explanation .finding.issue{border-color:var(--pink)}#explanation .finding.proposal{border-color:#c48e38}.tag{font-size:9px;letter-spacing:.8px;text-transform:uppercase;color:var(--muted);display:block;margin-bottom:5px}.metric{display:inline-block;border:1px solid var(--line);padding:5px 9px;font-size:12px;border-radius:5px;margin:4px 4px 0 0}.functional{margin-top:16px;padding:18px 16px 13px;background:white;border:1px solid var(--line);border-radius:10px}.flow-head{display:flex;gap:10px;align-items:start;justify-content:space-between}.flow-head h3{font-size:14px}.flow-head>span{font-size:8px;letter-spacing:1px;color:var(--muted);white-space:nowrap;padding-top:3px}#flow svg{display:block;width:100%;height:auto;margin-top:8px}#flow svg text{font-family:'DM Sans',sans-serif;fill:var(--ink);font-size:13px}#flow-note{font-size:11px;color:var(--muted);line-height:1.5}.lesson-sources{font-size:10px;color:var(--muted);margin:14px 0}.step-nav{display:flex;justify-content:space-between;align-items:center;border-top:1px solid var(--line);padding-top:14px}.step-nav button{font-size:12px}.step-nav>span{font-size:11px;color:var(--muted)}#phase-control{display:flex;gap:5px;margin:12px 0 4px}#phase-control[hidden]{display:none}#phase-control button{font-size:11px;padding:5px 8px}.fix-plan{margin-top:50px;padding:34px 0;border-top:1px solid var(--line);display:grid;grid-template-columns:1fr 1.6fr;gap:60px}.fix-plan>div>p:last-child{max-width:350px;color:var(--muted)}.fix-plan ol{list-style:none;padding:0;margin:0;counter-reset:fix}.fix-plan li{counter-increment:fix;position:relative;padding:0 0 20px 45px}.fix-plan li:before{content:counter(fix);position:absolute;left:0;top:0;border:1px solid #a4bbb2;color:#4a7466;border-radius:50%;width:26px;height:26px;text-align:center;line-height:24px}.fix-plan li strong{display:block;font-size:14px}.fix-plan li span{font-size:13px;color:var(--muted)}.evidence{display:grid;grid-template-columns:1fr 1.6fr;gap:60px;border-top:1px solid var(--line);padding:34px 0 48px}.evidence>div>p{color:var(--muted);max-width:400px;font-size:13px}details{border-bottom:1px solid var(--line);padding:12px 0}summary{cursor:pointer;font-size:13px;font-weight:600}details p{font-size:12px;color:var(--muted)}code{overflow-wrap:anywhere;font-size:11px}footer{border-top:1px solid var(--line);padding:25px 4%;display:flex;justify-content:space-between;font-size:11px;color:var(--muted)}.skip{position:absolute;left:10px;top:-90px;z-index:10;background:white;padding:10px}.skip:focus{top:10px}
@media(min-width:1500px){#copper{height:630px}}@media(max-width:1050px){main{padding:0 3%}.workspace{grid-template-columns:minmax(0,1.2fr) minmax(310px,1fr);gap:16px}.lessons button{padding:13px 10px;gap:6px}.lessons span{font-size:11px}#copper{height:510px}.header-links{gap:15px}.revision{display:none}}
@media(max-width:760px){header{height:68px;padding:0 5%}.brand{font-size:14px}.brand small{font-size:10px}.header-links>a:first-child{display:none}.header-links{font-size:11px}main{padding:0 5%}.intro{display:block;padding:25px 0 20px}.intro-note{max-width:none;margin-top:18px;font-size:13px}.intro h1 br{display:none}.intro h1 span{display:block}h1{font-size:36px;letter-spacing:-1.3px}.lessons{display:flex;overflow-x:auto;scrollbar-width:thin}.lessons button{min-width:135px;padding:13px 11px}.workspace{display:flex;flex-direction:column}.board-panel,.lesson-panel{width:100%}.lesson-panel{padding-top:10px}.lesson-heading h2{font-size:26px}.panel-head{padding:16px}.map-tools{padding:0 12px 12px}.layer-tabs{flex-wrap:wrap}#copper{height:420px}.map-help{font-size:9px}#explanation{min-height:0}.functional{padding:15px}.fix-plan,.evidence{grid-template-columns:1fr;gap:20px;margin-top:30px;padding:28px 0}.fix-plan li{padding-bottom:18px}.fix-plan>div>p:last-child{max-width:none}footer{gap:20px;flex-direction:column;padding:20px 5%}.flow-head>span{font-size:7px}.panel-head h2{font-size:18px}}
@media(prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}