:root{--ink:#14353b;--teal:#126b62;--mint:#d9eee1;--paper:#f8f5ec;--orange:#ef733e;--yellow:#f6d46c;--border:#dbe1d6;font-family:Arial,Helvetica,sans-serif;color:var(--ink);background:var(--paper);font-size:16px}
*{box-sizing:border-box}html,body{min-width:0;overflow-x:hidden;margin:0}body{min-height:100dvh;line-height:1.52}button,input,select{font:inherit}button{cursor:pointer;border:2px solid var(--border);background:#fffdf7;color:var(--ink);border-radius:12px;font-weight:700;padding:10px 15px;min-height:44px;max-width:100%;transition:background .12s,transform .12s}button:hover{background:var(--mint)}button:active{transform:translateY(2px)}button:disabled{opacity:.4;cursor:not-allowed}button[aria-pressed=true]{border-color:var(--teal);background:var(--mint)}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,[role=button]:focus-visible{outline:3px solid #dc652e;outline-offset:4px}.primary{background:var(--orange);border-color:#d86532;color:var(--ink)}.primary:hover{background:#fa9c6a}h1,h2,h3{line-height:1.18;margin:0 0 12px}h1{font-size:clamp(1.5rem,3vw,2.15rem)}h2{font-size:1.35rem}h3{font-size:1.06rem}p{margin:8px 0 18px}a{color:#126b62}.fine{font-size:.87rem;color:#456260}.brand{background:var(--ink);color:var(--paper);padding:10px max(15px,env(safe-area-inset-left)) 10px max(15px,env(safe-area-inset-right));display:flex;align-items:center;justify-content:space-between;gap:18px;flex-wrap:wrap}.identity{display:flex;gap:10px;align-items:center;font-size:1.15rem;font-weight:900;letter-spacing:-.03em}.identity small{display:block;font-weight:700;font-size:.79rem;letter-spacing:0;color:var(--yellow)}nav{display:flex;gap:7px;flex-wrap:wrap}nav button{background:#1f4c4a;color:#fffdf7;border-color:#4c7b74;min-height:40px;padding:7px 13px}nav button[aria-current=page]{background:var(--yellow);color:var(--ink)}main{max-width:1280px;margin:auto;padding:20px 16px 50px}.panel{background:#fffdf7;border:1px solid var(--border);border-radius:22px;padding:22px;margin:0 0 18px;box-shadow:0 5px 0 #e9e5d9}.panel-title{display:flex;justify-content:space-between;align-items:start;flex-wrap:wrap;gap:12px;margin-bottom:12px}.eyebrow{font-size:.75rem;letter-spacing:.13em;font-weight:800;color:var(--teal)}.hero-banner{display:flex;align-items:center;gap:30px;background:linear-gradient(110deg,#d9eee1,#fffdf7);border:3px solid var(--ink);border-radius:22px;padding:22px 35px;margin-bottom:22px}.hero-banner p{max-width:550px}.hero-illustration{min-width:260px;width:35%;max-width:340px}.hero-illustration svg{width:100%;height:auto}.region-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,270px),1fr));gap:16px}.region{border:2px solid var(--border);background:#fff;border-radius:17px;padding:14px}.region-image{background:#dceadd;border-radius:12px;display:flex;align-items:center;justify-content:space-around;min-height:92px;font-size:3rem}.stars{font-size:.87rem;background:#fffdf7;padding:7px 10px;border-radius:11px;font-weight:800}.region h3{margin:14px 0 4px}.region p{font-size:.82rem;margin:0 0 11px;color:#365653}.missions{max-height:340px;overflow:auto;display:grid;gap:6px}.missions button{text-align:left;display:flex;align-items:center;gap:9px;padding:8px;min-height:56px;background:#fffdf7}.missions button>span:first-child{font-size:1.1rem}.missions strong,.missions small{display:block}.missions small{font-size:.69rem;font-weight:500}.side-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:8px}.side-button{text-align:left;font-size:.86rem}.stage-progress{display:grid;grid-template-columns:repeat(8,1fr);gap:5px;font-size:.63rem}.stage-progress span{background:#eeeae0;padding:8px 4px;border-radius:8px;text-align:center;overflow-wrap:anywhere}.stage-progress .current{background:var(--yellow);font-weight:800;border:1px solid var(--ink)}.stage-progress .done{background:var(--mint)}.mission-panel{text-align:center}.mission-panel .lab{text-align:left}.story-scene{height:190px;background:linear-gradient(#b6d6d6,#dceadd);border-radius:18px;display:flex;justify-content:center;align-items:center;gap:22px;font-size:2.2rem;margin:5px auto 22px;max-width:680px}.story-scene span{font-size:4.3rem}.big-message{font-size:clamp(1.1rem,2.8vw,1.4rem);max-width:760px;margin:10px auto 25px}.button-row{display:flex;flex-wrap:wrap;gap:8px;align-items:center;justify-content:flex-start;margin:12px 0}.mission-panel>.button-row,.mission-panel>button{justify-content:center}.demo{background:var(--mint);padding:18px;border-radius:14px;margin:15px auto;max-width:560px}.mini-diagram{display:flex;flex-wrap:wrap;align-items:center;justify-content:center;gap:12px;font-size:1.25rem}.two-checks{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:16px;text-align:left;margin:25px auto;max-width:750px}.mini-check{background:#f8f5ec;padding:16px;border:1px solid var(--border);border-radius:14px}.mini-check button{margin-right:7px;margin-bottom:8px}.lab{display:grid;grid-template-columns:minmax(0,1fr) minmax(220px,280px);gap:12px;align-items:start;margin:16px 0}.toolbar{grid-column:1/-1}.catalogue{display:flex;gap:8px;overflow-x:auto;padding:5px 1px 12px;scrollbar-width:thin}.catalogue button{flex:0 0 auto;min-width:90px;font-size:.79rem}.catalogue span{display:block;font-size:1.3rem}.board{min-width:0;border-radius:16px;border:2px solid var(--teal);overflow:hidden;background:#f5f8ef}.board-controls{display:flex;gap:6px;padding:8px;background:var(--mint);flex-wrap:wrap}.board-controls button{font-size:.84rem;padding:8px 10px}.circuit-svg{width:100%;height:auto;aspect-ratio:10/7;display:block;touch-action:pan-x pan-y}.terminal{stroke:#14353b;stroke-width:3;cursor:pointer}.terminal:hover{stroke:#ef733e;stroke-width:5}.component text{user-select:none}.lab-status{background:#f8f5ec;border-radius:12px;border:1px solid var(--border);padding:12px;grid-column:1;overflow-wrap:anywhere}.lab-status p{margin:7px 0}.lab-status small{font-size:.75rem}.inspector{grid-column:2;grid-row:2/span 2;background:#fffdf7;border:2px solid var(--border);border-radius:14px;padding:14px;min-width:0}.inspector h3{margin-bottom:6px}.inspector label{display:flex;flex-direction:column;gap:4px;font-size:.82rem}.inspector input{width:100%;padding:8px;border:1px solid #aaa;border-radius:8px}.inspector button{font-size:.77rem;padding:6px 9px}.reference{border-top:1px solid var(--border);margin-top:24px;padding:20px}.reference p{font-size:.85rem}.check{display:block;margin:9px 0}.check input{width:18px;height:18px;vertical-align:middle}.region-stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(130px,1fr));gap:8px}.region-stats div{padding:10px;background:var(--mint);border-radius:10px;display:flex;justify-content:space-between}label select{padding:8px;margin:7px;border-radius:9px}.big-text{font-size:19px}.high-contrast{--ink:#092024;--teal:#03433d;--border:#64716d;--mint:#e4f8e8}footer{text-align:center;color:#456260;font-size:.83rem;margin:0 auto 18px;padding:0 16px}code{background:#eee6cc;padding:2px 4px;border-radius:4px}button:focus-visible,.terminal:focus-visible{outline:3px solid #dc652e;outline-offset:3px}@media(max-width:780px){.hero-banner{padding:16px;gap:10px}.hero-illustration{min-width:150px}.lab{grid-template-columns:1fr}.inspector{grid-column:1;grid-row:auto}.lab-status{grid-column:1}.stage-progress{grid-template-columns:repeat(4,1fr)}.panel{padding:15px}.brand{padding-top:env(safe-area-inset-top)}nav{width:100%}nav button{flex:1}main{padding:12px 10px 38px}}@media(max-width:450px){.hero-banner{display:block}.hero-illustration{width:80%;margin:auto}.story-scene{height:140px}.story-scene span{font-size:2.7rem}.stage-progress{font-size:.57rem}.board-controls button{font-size:.77rem}.missions{max-height:300px}}@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation-duration:.01ms!important;transition-duration:.01ms!important;scroll-behavior:auto!important}}.reduce-motion *, .reduce-motion *:before,.reduce-motion *:after{animation:none!important;transition:none!important}@media print{header,footer,.toolbar,.board-controls,.inspector,button,.side-grid{display:none!important}main,.panel{max-width:100%;padding:0;box-shadow:none!important}.lab{display:block}.circuit-svg{max-width:850px}.lab-status{display:none}}


/* CircuitQuest Build It: large scrollable workbench, not a tiny scaled drawing. */
.lab{grid-template-columns:minmax(0,1fr) minmax(240px,330px);gap:16px}
.lab .board{grid-column:1/-1;min-width:0;overflow:hidden;border:3px solid #14353b;background:#f5f8ef}
.lab .lab-status{grid-column:1;grid-row:auto;margin:0}
.lab .inspector{grid-column:2;grid-row:auto;margin:0;align-self:stretch}
.board-controls{align-items:center;gap:10px;padding:12px}
.board-controls button{min-height:48px;padding:10px 14px}
.zoom-indicator{display:inline-flex;font-weight:800;background:#fffdf7;padding:8px 12px;border-radius:10px}
.board-help{color:#14353b;font-weight:700;background:#fffdf7;margin:0;padding:12px 16px;border-bottom:2px solid #cbdcc0}
.circuit-scroll{display:block;overflow-x:auto;overflow-y:auto;width:100%;max-width:100%;max-height:760px;overscroll-behavior:contain;scrollbar-width:auto;scrollbar-color:#126b62 #d9eee1;touch-action:pan-x pan-y}
.circuit-scroll:focus-visible{outline:4px solid #dc652e;outline-offset:-5px}
.circuit-scroll::-webkit-scrollbar{height:13px;width:13px}
.circuit-scroll::-webkit-scrollbar-thumb{background:#126b62;border-radius:8px}
.circuit-scroll::-webkit-scrollbar-track{background:#d9eee1}
.circuit-scroll .circuit-svg{min-width:900px;width:100%;height:auto;aspect-ratio:auto;display:block;touch-action:pan-x pan-y}
.wire-outline{stroke:#fffdf7;stroke-width:16;fill:none;stroke-linecap:round;stroke-linejoin:round;pointer-events:none}
.wire-line{stroke:#126b62;stroke-width:9;fill:none;stroke-linecap:round;stroke-linejoin:round;pointer-events:none}
.wire-remove{cursor:pointer}
.wire-remove circle{filter:drop-shadow(0 1px 2px #14353b33)}
.wire-remove:focus-visible circle,.terminal-target:focus-visible .terminal{stroke:#dc652e;stroke-width:6}
.terminal-target{cursor:pointer;outline:none}
.terminal-target:hover .terminal,.terminal-selected .terminal{stroke:#dc652e;stroke-width:6}
.component text{user-select:none}
.connection-instructions{background:#e1f0e4;border-top:2px solid #b9d7c9;padding:12px 16px;font-weight:700;color:#14353b}
.connections{padding:12px 16px;background:#fffdf7;border-top:1px solid #cbdcc0}
.connections summary{font-size:.95rem;font-weight:800;cursor:pointer;padding:7px 0;min-height:44px}
.connection-list{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,310px),1fr));gap:9px;padding:9px 0}
.connection{border:2px solid #dbe1d6;border-radius:12px;padding:10px;display:flex;align-items:center;justify-content:space-between;gap:10px;flex-wrap:wrap}
.connection span{font-weight:700;overflow-wrap:anywhere}
.connection button{min-height:44px;white-space:nowrap}
.toolbar .button-row{margin:5px 0 12px}
.toolbar .button-row button{min-height:48px}
.mobile-pan{display:none}
@media(max-width:780px){
 .lab{grid-template-columns:minmax(0,1fr);gap:12px}
 .lab .board,.lab .lab-status,.lab .inspector{grid-column:1;grid-row:auto}
 .board-controls{gap:7px;padding:9px}
 .board-controls button{font-size:.85rem;padding:9px 11px}
 .mobile-pan{display:inline}
 .circuit-scroll{max-height:65dvh}
 .circuit-scroll .circuit-svg{min-width:900px}
 .board-help,.connection-instructions{padding:10px 12px;font-size:.9rem}
 .lab .inspector button{min-height:44px;font-size:.9rem}
}
@media print{
 .circuit-scroll{overflow:visible;max-height:none}
 .circuit-scroll .circuit-svg{min-width:0!important;max-width:100%;width:100%!important}
 .connections,.board-help,.connection-instructions{display:none!important}
}