:root{
  --bg:#0e1420; --panel:rgba(16,22,36,.88); --line:rgba(255,255,255,.09);
  --txt:#eef2f7; --dim:#9aa7bd; --acc:#4caf50; --warn:#ff9800; --bad:#f44336;
  --steel:#4aa3ff; --wood:#d29a5f; --cable:#e8ecf3; --road:#ffd54f;
}
*{box-sizing:border-box; -webkit-tap-highlight-color:transparent}
html,body{margin:0;height:100%;background:var(--bg);color:var(--txt);
  font-family:'Pretendard','Apple SD Gothic Neo',system-ui,sans-serif;overflow:hidden}
#app{position:fixed;inset:0}
#game{position:absolute;inset:0;width:100%;height:100%;display:block;cursor:crosshair;touch-action:none}
#palette{max-height:calc(100vh - 140px);overflow-y:auto}
#zoomctl{display:flex;flex-direction:column;gap:6px;
  background:#1b2440;border:1px solid var(--line);border-radius:10px;padding:8px;margin-top:8px}
.zc-row{display:flex;gap:6px;align-items:center}
.zc-row button{flex:none}
#zoomctl input[type=range]{flex:1;min-width:0}
#zoomctl button{background:#222c42;color:#fff;border:1px solid var(--line);
  border-radius:8px;padding:5px 9px;cursor:pointer;font-size:14px}
#zoomctl button:hover{background:#33405e}
.zc-ico{font-size:12px;color:var(--dim);width:16px;text-align:center}
#zoomSlider{accent-color:var(--acc)}
#panX,#panY{accent-color:var(--steel)}
#zoomLabel{font-size:12px;color:var(--dim);min-width:42px;text-align:right;font-variant-numeric:tabular-nums}

#topbar{position:absolute;top:10px;left:50%;transform:translateX(-50%);
  display:flex;gap:10px;align-items:center;background:var(--panel);
  border:1px solid var(--line);border-radius:14px;padding:8px 12px;
  backdrop-filter:blur(10px);z-index:10;max-width:96vw;flex-wrap:wrap;justify-content:center}
.brand{font-size:15px;white-space:nowrap}.brand span{font-size:10px;color:var(--dim);
  border:1px solid var(--line);border-radius:6px;padding:1px 5px;margin-left:4px}
.level-box{display:flex;gap:4px;align-items:center}
.level-box button{background:#222c42;color:#fff;border:1px solid var(--line);
  border-radius:8px;padding:5px 9px;cursor:pointer}
#levelSelect{background:#222c42;color:#fff;border:1px solid var(--line);
  border-radius:8px;padding:6px;max-width:220px}
.budget-box{min-width:190px}.budget-top{display:flex;justify-content:space-between;
  font-size:12px;color:var(--dim)}#budgetText{color:#fff;font-weight:700;font-variant-numeric:tabular-nums}
.budget-bar{height:8px;background:#0a0f1c;border-radius:99px;overflow:hidden;margin-top:4px;
  border:1px solid var(--line)}
#budgetFill{height:100%;width:0%;background:var(--acc);transition:width .2s,background .2s}
.sim-box{display:flex;gap:6px}
.tab{background:#222c42;color:#ddd;border:1px solid var(--line);border-radius:10px;
  padding:8px 12px;cursor:pointer;font-weight:700}
.tab.active{outline:2px solid var(--acc)}
.tab.go{background:var(--acc);color:#fff;border:none}
.tab.hidden{display:none}
#btnStop{background:var(--warn);color:#fff;border:none}

aside{position:absolute;top:76px;background:var(--panel);border:1px solid var(--line);
  border-radius:14px;padding:12px;backdrop-filter:blur(10px);z-index:10;width:196px}
#palette{left:10px}#testpanel{right:10px}
aside h3{margin:6px 0 8px;font-size:13px;color:var(--dim);font-weight:700}
aside h3 small{font-weight:400;opacity:.7}
#materials{max-height:44vh;overflow-y:auto;padding-right:2px}
.mat{display:flex;gap:8px;align-items:center;width:100%;text-align:left;
  background:#1b2440;color:#fff;border:2px solid transparent;border-radius:10px;
  padding:8px;margin-bottom:6px;cursor:pointer}
.mat.active{border-color:var(--acc)}
.mat .sw{width:34px;height:12px;border-radius:6px;flex:none}
.mat .nm{font-size:13px;font-weight:700}.mat .nm small{display:block;font-weight:400;
  color:var(--dim);font-size:11px}
.mat .key{margin-left:auto;font-size:11px;color:var(--dim);border:1px solid var(--line);
  border-radius:6px;padding:1px 6px}
.tools{display:grid;grid-template-columns:1fr 1fr 1fr;gap:6px}
.tool{background:#222c42;color:#ddd;border:1px solid var(--line);border-radius:8px;
  padding:7px 4px;cursor:pointer;font-size:12px}
.tool.active{background:var(--acc);color:#fff}
.row{display:flex;align-items:center;gap:6px;font-size:12px;color:var(--dim);margin-top:8px}
.row.btns{display:grid;grid-template-columns:1fr 1fr 1fr;gap:6px}
.row.btns button{background:#222c42;color:#fff;border:1px solid var(--line);
  border-radius:8px;padding:7px;cursor:pointer}
#cars{display:grid;gap:6px;margin-bottom:8px}
.car{display:flex;gap:8px;align-items:center;background:#1b2440;border:2px solid transparent;
  border-radius:10px;padding:7px;cursor:pointer;color:#fff;font-size:12px;text-align:left}
.car.active{border-color:var(--acc)}
.wide{width:100%;margin-top:6px;background:#222c42;color:#fff;border:1px solid var(--line);
  border-radius:10px;padding:9px;cursor:pointer}
.wide.primary,.primary{background:var(--acc);color:#fff;border:none;border-radius:10px;
  padding:9px 14px;cursor:pointer;font-weight:800}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:6px;margin-top:6px}
.grid2 button{background:#222c42;color:#fff;border:1px solid var(--line);
  border-radius:8px;padding:8px 4px;cursor:pointer;font-size:12px}
.slider-row{display:grid;grid-template-columns:52px 1fr 44px;gap:6px;align-items:center;
  font-size:12px;color:var(--dim);margin-top:8px}
.slider-row input{width:100%}
#statusbar{position:absolute;left:50%;transform:translateX(-50%);bottom:10px;
  display:flex;gap:14px;align-items:center;background:var(--panel);
  border:1px solid var(--line);border-radius:99px;padding:7px 16px;font-size:12px;
  color:var(--dim);z-index:10;max-width:94vw;white-space:nowrap;overflow:hidden}
#stressLegend i{display:inline-block;width:22px;height:8px;border-radius:4px;vertical-align:middle}
#stressLegend i.t{background:linear-gradient(90deg,#ffb3ab,#f44336)}
#stressLegend i.c{background:linear-gradient(90deg,#90caf9,#1565c0)}
#maxStrain{color:#fff}
#overlay{position:absolute;inset:0;background:rgba(4,8,16,.6);display:flex;
  align-items:center;justify-content:center;z-index:20}
#overlay.hidden,.hidden{display:none!important}
#overlayCard{background:#141c31;border:1px solid var(--line);border-radius:18px;
  padding:28px 32px;text-align:center;min-width:320px;max-width:90vw;
  box-shadow:0 20px 60px rgba(0,0,0,.5)}
#overlayCard h1{margin:0 0 8px}#overlayCard p{color:var(--dim)}
#ovStats{display:flex;gap:10px;justify-content:center;margin:14px 0;flex-wrap:wrap}
#ovStats div{background:#0d1426;border:1px solid var(--line);border-radius:10px;
  padding:8px 14px;font-size:13px}
#ovStats b{display:block;font-size:18px}
.ov-btns{display:flex;gap:8px;justify-content:center;flex-wrap:wrap}
.ov-btns button{background:#222c42;color:#fff;border:1px solid var(--line);
  border-radius:10px;padding:10px 16px;cursor:pointer}
#help{position:absolute;inset:0;background:rgba(4,8,16,.65);z-index:30;
  display:flex;align-items:center;justify-content:center;padding:16px}
.help-card{background:#141c31;border:1px solid var(--line);border-radius:18px;
  padding:24px 28px;max-width:560px;max-height:88vh;overflow:auto}
.help-card ol{line-height:1.9;color:#cfd8e6;font-size:14px}
.help-card .tip{background:#0d1426;border-left:4px solid var(--acc);padding:10px 12px;
  border-radius:0 10px 10px 0;font-size:13px;color:#cfd8e6}
kbd{background:#000;border:1px solid #444;border-bottom-width:2px;border-radius:6px;
  padding:0 6px;font-size:12px;font-family:inherit}
@media (max-width:1100px){
  aside{width:160px;padding:8px}#palette{top:auto;bottom:52px}
  #testpanel{top:76px}.budget-box{min-width:140px}
}
@media (max-width:760px){
  #palette{display:none}#testpanel{width:150px}
  #statusbar{display:none}
}