:root {
  --ink:#102044; --muted:#5c6b8a; --panel:#ffffff; --bg:#eef5ff; --brand:#6d5dfc;
  --brand2:#22c6dc; --accent:#ffb82e; --good:#168b67; --bad:#c53c58; --line:#cbd7ec;
  --grid:72px; --radius:22px; --shadow:0 16px 40px rgba(31,54,107,.13);
}
*{box-sizing:border-box} html{min-height:100%;background:var(--bg)} body{margin:0;min-height:100%;font-family:Inter,ui-rounded,"SF Pro Rounded","Segoe UI",system-ui,sans-serif;color:var(--ink);background:radial-gradient(circle at 20% 0,#fff 0,#f6f9ff 34%,#e9f3ff 100%);line-height:1.45}
button,input,label{font:inherit} button{color:inherit}.skip-link{position:fixed;left:12px;top:-100px;z-index:100;background:#fff;padding:12px;border-radius:10px}.skip-link:focus{top:12px}.topbar{position:sticky;top:0;z-index:30;display:flex;align-items:center;justify-content:space-between;padding:12px clamp(14px,3vw,34px);background:rgba(247,251,255,.92);backdrop-filter:blur(14px);border-bottom:1px solid #d9e4f5}.brand{display:flex;gap:10px;align-items:center;border:0;background:none;cursor:pointer;text-align:left}.brand strong{display:block;font-size:1.05rem}.brand small{display:block;color:var(--muted);font-size:.72rem}.brand-mark{display:grid;place-items:center;width:42px;height:42px;border-radius:14px;background:linear-gradient(135deg,#ffe066,#ffad32);box-shadow:inset 0 -3px 0 rgba(0,0,0,.08);font-size:1.35rem}.status-strip{display:flex;align-items:center;gap:8px}.status-pill{display:flex;align-items:center;gap:5px;background:#fff;border:1px solid #dbe5f5;border-radius:999px;padding:7px 10px}.status-pill:first-child span{color:#f6a900}.avatar-button{width:42px;height:42px;border-radius:50%;border:2px solid #fff;background:#dff7ff;box-shadow:0 0 0 2px #bdd5ed;cursor:pointer;font-size:1.35rem}.main-nav{display:flex;gap:8px;padding:12px clamp(14px,3vw,34px);overflow:auto;position:sticky;top:67px;z-index:25;background:rgba(239,246,255,.94);backdrop-filter:blur(12px);border-bottom:1px solid #dbe6f7}.nav-btn{border:0;background:transparent;padding:10px 14px;border-radius:14px;font-weight:700;white-space:nowrap;cursor:pointer}.nav-btn.active{background:#fff;box-shadow:0 4px 16px rgba(43,68,115,.09);color:#4336c9}main{width:min(1220px,100%);margin:0 auto;padding:24px clamp(14px,3vw,34px) 70px}.screen{display:none}.screen.active{display:block}.hero-panel,.section-heading{display:flex;align-items:end;justify-content:space-between;gap:24px;margin-bottom:22px}.hero-panel{background:linear-gradient(135deg,#172a52,#2d3f74);color:#fff;padding:clamp(20px,4vw,38px);border-radius:28px;box-shadow:var(--shadow);align-items:center}.hero-panel h1,.section-heading h1{margin:.2rem 0 .5rem;font-size:clamp(1.7rem,4vw,3rem);line-height:1.05}.hero-panel p{max-width:700px;margin:0;color:#d9e7ff}.eyebrow{margin:0;font-size:.73rem;letter-spacing:.14em;font-weight:900;text-transform:uppercase;color:#6d7fa2}.hero-panel .eyebrow{color:#72e7f1}.power-meter{width:min(300px,35vw);min-width:160px;height:20px;background:#0c1734;border:2px solid #6a7fa8;border-radius:999px;padding:3px;overflow:hidden}.power-meter>div{height:100%;width:0;border-radius:999px;background:linear-gradient(90deg,#45e1b8,#ffe064);transition:width .6s ease}.city-map{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px;position:relative}.building{position:relative;min-height:200px;border:0;border-radius:24px;padding:18px;overflow:hidden;text-align:left;background:linear-gradient(180deg,#dce6f2,#c7d4e5);box-shadow:inset 0 -5px 0 rgba(16,32,68,.08),0 10px 26px rgba(52,71,110,.11);cursor:pointer;transition:transform .2s ease,box-shadow .2s ease}.building:hover:not(:disabled){transform:translateY(-4px);box-shadow:0 16px 34px rgba(52,71,110,.18)}.building:disabled{cursor:not-allowed;filter:saturate(.4)}.building.powered{background:linear-gradient(160deg,#fff6bf,#b9f9ed 55%,#bcdcff)}.building.partial{background:linear-gradient(160deg,#e9f2ff,#e6dfff)}.building-icon{font-size:3rem;display:block;margin-bottom:18px;filter:grayscale(1);opacity:.72}.building.powered .building-icon,.building.partial .building-icon{filter:none;opacity:1}.building h2{margin:0 0 4px;font-size:1.15rem}.building p{margin:0;color:#52627f;font-size:.86rem}.building-progress{position:absolute;left:18px;right:18px;bottom:16px;display:flex;align-items:center;justify-content:space-between;gap:10px;font-weight:800;font-size:.78rem}.building-lock{position:absolute;top:14px;right:14px;background:#263655;color:#fff;border-radius:999px;padding:6px 10px;font-size:.72rem}.city-glow{position:absolute;inset:auto 20px 16px auto;width:48px;height:48px;border-radius:50%;background:#ffe45d;filter:blur(16px);opacity:0}.building.powered .city-glow{opacity:.7}.building[data-building="arcade"].powered::after,.building[data-building="cinema"].powered::after{content:"✦  ✧  ✦";position:absolute;right:16px;top:20px;color:#ff4e9f;font-weight:900;animation:blink 1.2s infinite}.building[data-building="theme-park"].powered .building-icon{display:inline-block;animation:spin 5s linear infinite}.inline-actions,.stack-actions{display:flex;gap:10px;flex-wrap:wrap}.btn{border:0;border-radius:14px;background:linear-gradient(180deg,#6d5dfc,#5749e0);color:#fff;font-weight:800;padding:11px 16px;min-height:44px;cursor:pointer;box-shadow:inset 0 -3px 0 rgba(0,0,0,.14)}.btn:hover{filter:brightness(1.04)}.btn.secondary{background:#fff;color:#263659;border:1px solid #cdd9ec;box-shadow:none}.btn.danger{background:#b93b53}.btn.big{min-width:180px}.panel-card,.saved-lab-panel{background:#fff;border:1px solid #dce6f4;border-radius:22px;padding:20px;box-shadow:0 8px 24px rgba(44,70,115,.08)}.settings-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.panel-card h2,.saved-lab-panel h2{margin-top:0}.setting-row{display:flex;align-items:center;justify-content:space-between;gap:14px;padding:14px 0;border-bottom:1px solid #edf1f7}.setting-row:last-child{border-bottom:0}.setting-row small{display:block;color:var(--muted);margin-top:3px}.setting-row input{width:24px;height:24px}.stack-actions{flex-direction:column}.file-btn{display:flex;align-items:center;justify-content:center}.file-btn input{display:none}.avatar-choices{display:flex;gap:10px;flex-wrap:wrap}.avatar-choice{font-size:1.6rem;width:52px;height:52px;border:2px solid #d8e3f2;border-radius:16px;background:#f7fbff;cursor:pointer}.avatar-choice.selected{border-color:#6d5dfc;box-shadow:0 0 0 3px #ddd8ff}.avatar-choice:disabled{filter:grayscale(1);opacity:.4;cursor:not-allowed}.achievement-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}.achievement-card{background:#fff;border:1px solid #dce6f4;border-radius:20px;padding:18px;display:grid;grid-template-columns:auto 1fr;gap:14px;align-items:center}.achievement-card.locked{opacity:.55;filter:grayscale(.6)}.achievement-icon{font-size:2rem}.achievement-card h3{margin:0}.achievement-card p{margin:4px 0 0;color:var(--muted);font-size:.9rem}.saved-lab-panel{margin-top:16px}.saved-list{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}.saved-item{border:1px solid #dbe5f4;border-radius:14px;padding:12px;background:#f9fbff}.saved-item h3{font-size:.95rem;margin:0 0 8px}.saved-item .row{display:flex;gap:6px}.saved-empty{color:var(--muted)}
.game-dialog{width:min(1180px,calc(100vw - 18px));max-height:calc(100dvh - 18px);border:0;border-radius:24px;padding:0;box-shadow:0 30px 90px rgba(15,28,62,.35);background:#f5f9ff;color:var(--ink)}.game-dialog::backdrop,.reward-dialog::backdrop{background:rgba(15,25,52,.66);backdrop-filter:blur(5px)}.dialog-topbar{position:sticky;top:0;z-index:20;display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:14px;padding:12px 16px;background:#fff;border-bottom:1px solid #dfe7f4}.dialog-topbar h2{margin:0}.icon-btn{width:44px;height:44px;border:1px solid #d5e0ef;border-radius:13px;background:#fff;cursor:pointer;font-size:1.15rem}.mini-stars{color:#f0a700;letter-spacing:.1em}.dialog-content{padding:16px}.mission-panel{display:flex;justify-content:space-between;gap:20px;align-items:center;margin-bottom:14px}.mission-panel h3{margin:0}.mission-panel p{margin:.3rem 0}.mission-actions{display:flex;gap:8px}.concept-card{display:inline-flex;gap:8px;align-items:center;background:#e8f9ff;color:#21475c;border:1px solid #bceaf3;border-radius:12px;padding:8px 10px;font-size:.84rem}.feedback-panel{margin-top:12px;min-height:58px;border-radius:14px;padding:12px 14px;background:#fff;border:1px solid #dce5f2}.feedback-panel.good{border-color:#9ed9c7;background:#f0fff9}.feedback-panel.bad{border-color:#efbcc7;background:#fff4f6}.feedback-panel strong{display:block;margin-bottom:2px}
.workbench-shell{display:grid;grid-template-columns:220px 1fr 250px;gap:12px;align-items:stretch}.palette,.inspector{background:#fff;border:1px solid #dbe5f2;border-radius:18px;padding:12px}.palette h3,.inspector h3{font-size:.86rem;margin:0 0 10px}.palette-grid{display:grid;grid-template-columns:1fr 1fr;gap:8px}.palette-item{border:1px solid #d5e0ef;background:#f7faff;border-radius:12px;min-height:64px;padding:8px;cursor:pointer;font-size:.76rem;font-weight:800}.palette-item span{display:block;font-size:1.35rem}.palette-item:disabled{opacity:.38;cursor:not-allowed}.workbench{position:relative;min-height:432px;background-color:#dfeeff;background-image:linear-gradient(#c6d9ef 1px,transparent 1px),linear-gradient(90deg,#c6d9ef 1px,transparent 1px);background-size:var(--grid) var(--grid);border:2px solid #bed2ea;border-radius:20px;overflow:hidden;touch-action:none}.workbench::before{content:"WORKBENCH";position:absolute;right:12px;bottom:8px;color:#8ba6c4;font-size:.65rem;letter-spacing:.16em;font-weight:900}.component{position:absolute;width:82px;height:64px;transform:translate(-50%,-50%);z-index:5}.component-core{position:absolute;inset:5px 9px;border:2px solid #526a92;border-radius:15px;background:linear-gradient(#fff,#edf3fb);box-shadow:0 4px 0 #b4c1d5;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:1px;cursor:grab;user-select:none;touch-action:none;font-weight:900;font-size:.72rem}.component-core .symbol{font-size:1.45rem;line-height:1}.component[data-type="battery"] .component-core{background:linear-gradient(#fff4b8,#ffd65e)}.component[data-type="bulb"] .component-core.active,.component[data-type="motor"] .component-core.active,.component[data-type="buzzer"] .component-core.active{box-shadow:0 0 0 4px rgba(255,196,47,.22),0 0 24px rgba(255,190,42,.7),0 4px 0 #b4c1d5}.component[data-type="switch"] .component-core.closed{background:#d8fff0}.component[data-type="resistor"] .component-core{background:#ffe9d7}.component.faulty .component-core{border-color:#c53c58}.port{position:absolute;top:50%;width:24px;height:24px;border:3px solid #fff;border-radius:50%;background:#647da6;box-shadow:0 0 0 2px #344c73;transform:translateY(-50%);z-index:7;cursor:pointer;padding:0}.port.left{left:-2px}.port.right{right:-2px}.port.positive{background:#e84a57}.port.negative{background:#293b58}.port.selected{box-shadow:0 0 0 4px #ffe363,0 0 0 6px #664f00}.port:focus-visible,.component-core:focus-visible,.btn:focus-visible,.nav-btn:focus-visible,.building:focus-visible,.palette-item:focus-visible,.connection-item button:focus-visible,.avatar-choice:focus-visible{outline:4px solid #172a52;outline-offset:3px}.wire-layer{position:absolute;inset:0;width:100%;height:100%;z-index:3;pointer-events:none}.wire-visible{fill:none;stroke:#4a668e;stroke-width:6;stroke-linecap:round;stroke-linejoin:round}.wire-active{stroke:#ffe15d;stroke-dasharray:8 10;animation:flow .65s linear infinite}.wire-faulty{stroke:#c53c58;stroke-dasharray:4 8}.obstacle{position:absolute;border-radius:14px;background:repeating-linear-gradient(135deg,#7c8da7 0 10px,#a8b6c9 10px 20px);border:3px solid #667992;display:grid;place-items:center;color:#fff;font-size:.7rem;font-weight:900;z-index:2}.inspector .diag{font-size:.82rem;color:var(--muted);margin:0 0 8px}.connection-list{display:flex;flex-direction:column;gap:6px;max-height:240px;overflow:auto}.connection-item{display:flex;justify-content:space-between;align-items:center;gap:6px;background:#f6f9fd;border:1px solid #dde6f2;border-radius:10px;padding:6px 8px;font-size:.72rem}.connection-item button{border:0;background:#ffe7ec;color:#9d3045;border-radius:8px;min-width:34px;min-height:34px;cursor:pointer}.help-list{padding-left:18px;margin:8px 0 0;font-size:.78rem;color:var(--muted)}.reward-dialog{width:min(440px,calc(100vw - 30px));border:0;border-radius:28px;text-align:center;padding:28px;background:#fff;color:var(--ink)}.reward-burst{font-size:3rem}.reward-dialog h2{font-size:2rem;margin:.3rem 0}.reward-stars{font-size:2.2rem;color:#f4aa00;letter-spacing:.14em}.reward-unlocks{display:flex;flex-wrap:wrap;gap:8px;justify-content:center;margin:14px 0}.unlock-chip{background:#edf5ff;border:1px solid #cfe0f6;border-radius:999px;padding:7px 10px;font-size:.78rem;font-weight:800}.toast{position:fixed;left:50%;bottom:22px;transform:translate(-50%,120px);background:#172a52;color:#fff;border-radius:14px;padding:11px 16px;box-shadow:0 10px 30px rgba(20,35,70,.25);z-index:100;transition:transform .2s ease}.toast.show{transform:translate(-50%,0)}
body.large-controls{--grid:80px}.large-controls .port{width:30px;height:30px}.large-controls .palette-item{min-height:74px}@keyframes flow{to{stroke-dashoffset:-18}}@keyframes blink{50%{opacity:.3}}@keyframes spin{to{transform:rotate(360deg)}}
@media (prefers-reduced-motion:reduce){*,*::before,*::after{animation-duration:.001ms!important;animation-iteration-count:1!important;scroll-behavior:auto!important;transition-duration:.001ms!important}}body.reduced-motion *,body.reduced-motion *::before,body.reduced-motion *::after{animation:none!important;transition:none!important}
@media (max-width:900px){.city-map{grid-template-columns:repeat(2,1fr)}.settings-grid,.achievement-grid{grid-template-columns:1fr 1fr}.workbench-shell{grid-template-columns:1fr}.palette-grid{grid-template-columns:repeat(4,1fr)}.inspector{order:3}.workbench{min-height:410px}.mission-panel{align-items:flex-start;flex-direction:column}.mission-actions{width:100%}.mission-actions .btn{flex:1}.saved-list{grid-template-columns:1fr 1fr}}
@media (max-width:600px){.topbar{padding:8px 10px}.brand small{display:none}.main-nav{top:59px;padding:8px 10px}.nav-btn{padding:9px 11px}.hero-panel,.section-heading{flex-direction:column;align-items:stretch}.power-meter{width:100%}.city-map{grid-template-columns:1fr}.building{min-height:160px}.settings-grid,.achievement-grid,.saved-list{grid-template-columns:1fr}.dialog-content{padding:10px}.dialog-topbar{padding:8px 10px}.dialog-topbar .eyebrow{display:none}.game-dialog{width:100vw;max-height:100dvh;height:100dvh;border-radius:0}.palette{overflow:auto}.palette-grid{display:flex}.palette-item{min-width:86px}.workbench{min-height:390px}.component{width:74px;height:58px}.component-core{font-size:.66rem}.component-core .symbol{font-size:1.25rem}.status-pill{padding:6px 8px}.status-pill:first-child span,.status-pill:nth-child(2) span{display:none}}
.level-dots{display:flex;gap:7px;margin-top:14px}.level-dot{width:38px;height:38px;border:1px solid #c6d4e8;border-radius:12px;background:#f8fbff;font-weight:900;cursor:pointer}.level-dot.done{background:#fff1a9;border-color:#f1cb44;color:#8b6500}.level-dot:disabled{opacity:.45;cursor:not-allowed}.state-mark{font-size:.55rem;text-transform:uppercase;letter-spacing:.05em;color:#3c567e;min-height:.7em}.component-core.active .state-mark{color:#6b4f00}.component-core.closed .state-mark{color:#116f52}
.city-scene{grid-column:1/-1;position:relative;height:118px;border-radius:24px;overflow:hidden;background:linear-gradient(180deg,#253b72 0,#435d94 68%,#617ba7 69%,#405271 100%);box-shadow:inset 0 -12px 24px rgba(8,20,49,.25)}.scene-skyline{position:absolute;left:0;right:0;bottom:24px;color:#18294d;font-size:4.6rem;letter-spacing:-.12em;white-space:nowrap;overflow:hidden;line-height:.7;opacity:.9}.scene-deco{position:absolute;z-index:2}.scene-deco.lights{left:5%;right:5%;bottom:8px;text-align:center;letter-spacing:1.6em;font-size:1.15rem}.scene-deco.trees{left:12%;bottom:16px;font-size:1.35rem}.scene-deco.neon{left:50%;top:14px;transform:translateX(-50%);color:#ffe26d;text-shadow:0 0 10px #ff6cc4;font-size:.83rem;font-weight:1000;letter-spacing:.16em;white-space:nowrap;animation:blink 1.5s infinite}.scene-deco.beacon{right:8%;top:10px;font-size:1.5rem;animation:blink 2s infinite}.building[aria-disabled="true"]{cursor:not-allowed;filter:saturate(.4)}.building[aria-disabled="true"]:hover{transform:none;box-shadow:inset 0 -5px 0 rgba(16,32,68,.08),0 10px 26px rgba(52,71,110,.11)}.port{width:38px;height:38px}.port.left{left:-9px}.port.right{right:-9px}.large-controls .port{width:44px;height:44px}.large-controls .port.left{left:-12px}.large-controls .port.right{right:-12px}
@media (max-width:600px){.city-scene{height:96px}.scene-skyline{font-size:3.7rem}.scene-deco.lights{letter-spacing:.7em}}